| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S E M _ C H 1 2 -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2005, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 2, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, USA. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Atree; use Atree; |
| with Einfo; use Einfo; |
| with Elists; use Elists; |
| with Errout; use Errout; |
| with Expander; use Expander; |
| with Fname; use Fname; |
| with Fname.UF; use Fname.UF; |
| with Freeze; use Freeze; |
| with Hostparm; |
| with Inline; use Inline; |
| with Lib; use Lib; |
| with Lib.Load; use Lib.Load; |
| with Lib.Xref; use Lib.Xref; |
| with Nlists; use Nlists; |
| with Nmake; use Nmake; |
| with Opt; use Opt; |
| with Rident; use Rident; |
| with Restrict; use Restrict; |
| with Rtsfind; use Rtsfind; |
| with Sem; use Sem; |
| with Sem_Cat; use Sem_Cat; |
| with Sem_Ch3; use Sem_Ch3; |
| with Sem_Ch6; use Sem_Ch6; |
| with Sem_Ch7; use Sem_Ch7; |
| with Sem_Ch8; use Sem_Ch8; |
| with Sem_Ch10; use Sem_Ch10; |
| with Sem_Ch13; use Sem_Ch13; |
| with Sem_Disp; use Sem_Disp; |
| with Sem_Elab; use Sem_Elab; |
| with Sem_Elim; use Sem_Elim; |
| with Sem_Eval; use Sem_Eval; |
| with Sem_Res; use Sem_Res; |
| with Sem_Type; use Sem_Type; |
| with Sem_Util; use Sem_Util; |
| with Sem_Warn; use Sem_Warn; |
| with Stand; use Stand; |
| with Sinfo; use Sinfo; |
| with Sinfo.CN; use Sinfo.CN; |
| with Sinput; use Sinput; |
| with Sinput.L; use Sinput.L; |
| with Snames; use Snames; |
| with Stringt; use Stringt; |
| with Uname; use Uname; |
| with Table; |
| with Tbuild; use Tbuild; |
| with Uintp; use Uintp; |
| with Urealp; use Urealp; |
| |
| with GNAT.HTable; |
| |
| package body Sem_Ch12 is |
| |
| ---------------------------------------------------------- |
| -- Implementation of Generic Analysis and Instantiation -- |
| ----------------------------------------------------------- |
| |
| -- GNAT implements generics by macro expansion. No attempt is made to |
| -- share generic instantiations (for now). Analysis of a generic definition |
| -- does not perform any expansion action, but the expander must be called |
| -- on the tree for each instantiation, because the expansion may of course |
| -- depend on the generic actuals. All of this is best achieved as follows: |
| -- |
| -- a) Semantic analysis of a generic unit is performed on a copy of the |
| -- tree for the generic unit. All tree modifications that follow analysis |
| -- do not affect the original tree. Links are kept between the original |
| -- tree and the copy, in order to recognize non-local references within |
| -- the generic, and propagate them to each instance (recall that name |
| -- resolution is done on the generic declaration: generics are not really |
| -- macros!). This is summarized in the following diagram: |
| -- |
| -- .-----------. .----------. |
| -- | semantic |<--------------| generic | |
| -- | copy | | unit | |
| -- | |==============>| | |
| -- |___________| global |__________| |
| -- references | | | |
| -- | | | |
| -- .-----|--|. |
| -- | .-----|---. |
| -- | | .----------. |
| -- | | | generic | |
| -- |__| | | |
| -- |__| instance | |
| -- |__________| |
| -- |
| -- b) Each instantiation copies the original tree, and inserts into it a |
| -- series of declarations that describe the mapping between generic formals |
| -- and actuals. For example, a generic In OUT parameter is an object |
| -- renaming of the corresponing actual, etc. Generic IN parameters are |
| -- constant declarations. |
| -- |
| -- c) In order to give the right visibility for these renamings, we use |
| -- a different scheme for package and subprogram instantiations. For |
| -- packages, the list of renamings is inserted into the package |
| -- specification, before the visible declarations of the package. The |
| -- renamings are analyzed before any of the text of the instance, and are |
| -- thus visible at the right place. Furthermore, outside of the instance, |
| -- the generic parameters are visible and denote their corresponding |
| -- actuals. |
| |
| -- For subprograms, we create a container package to hold the renamings |
| -- and the subprogram instance itself. Analysis of the package makes the |
| -- renaming declarations visible to the subprogram. After analyzing the |
| -- package, the defining entity for the subprogram is touched-up so that |
| -- it appears declared in the current scope, and not inside the container |
| -- package. |
| |
| -- If the instantiation is a compilation unit, the container package is |
| -- given the same name as the subprogram instance. This ensures that |
| -- the elaboration procedure called by the binder, using the compilation |
| -- unit name, calls in fact the elaboration procedure for the package. |
| |
| -- Not surprisingly, private types complicate this approach. By saving in |
| -- the original generic object the non-local references, we guarantee that |
| -- the proper entities are referenced at the point of instantiation. |
| -- However, for private types, this by itself does not insure that the |
| -- proper VIEW of the entity is used (the full type may be visible at the |
| -- point of generic definition, but not at instantiation, or vice-versa). |
| -- In order to reference the proper view, we special-case any reference |
| -- to private types in the generic object, by saving both views, one in |
| -- the generic and one in the semantic copy. At time of instantiation, we |
| -- check whether the two views are consistent, and exchange declarations if |
| -- necessary, in order to restore the correct visibility. Similarly, if |
| -- the instance view is private when the generic view was not, we perform |
| -- the exchange. After completing the instantiation, we restore the |
| -- current visibility. The flag Has_Private_View marks identifiers in the |
| -- the generic unit that require checking. |
| |
| -- Visibility within nested generic units requires special handling. |
| -- Consider the following scheme: |
| -- |
| -- type Global is ... -- outside of generic unit. |
| -- generic ... |
| -- package Outer is |
| -- ... |
| -- type Semi_Global is ... -- global to inner. |
| -- |
| -- generic ... -- 1 |
| -- procedure inner (X1 : Global; X2 : Semi_Global); |
| -- |
| -- procedure in2 is new inner (...); -- 4 |
| -- end Outer; |
| |
| -- package New_Outer is new Outer (...); -- 2 |
| -- procedure New_Inner is new New_Outer.Inner (...); -- 3 |
| |
| -- The semantic analysis of Outer captures all occurrences of Global. |
| -- The semantic analysis of Inner (at 1) captures both occurrences of |
| -- Global and Semi_Global. |
| |
| -- At point 2 (instantiation of Outer), we also produce a generic copy |
| -- of Inner, even though Inner is, at that point, not being instantiated. |
| -- (This is just part of the semantic analysis of New_Outer). |
| |
| -- Critically, references to Global within Inner must be preserved, while |
| -- references to Semi_Global should not preserved, because they must now |
| -- resolve to an entity within New_Outer. To distinguish between these, we |
| -- use a global variable, Current_Instantiated_Parent, which is set when |
| -- performing a generic copy during instantiation (at 2). This variable is |
| -- used when performing a generic copy that is not an instantiation, but |
| -- that is nested within one, as the occurrence of 1 within 2. The analysis |
| -- of a nested generic only preserves references that are global to the |
| -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to |
| -- determine whether a reference is external to the given parent. |
| |
| -- The instantiation at point 3 requires no special treatment. The method |
| -- works as well for further nestings of generic units, but of course the |
| -- variable Current_Instantiated_Parent must be stacked because nested |
| -- instantiations can occur, e.g. the occurrence of 4 within 2. |
| |
| -- The instantiation of package and subprogram bodies is handled in a |
| -- similar manner, except that it is delayed until after semantic |
| -- analysis is complete. In this fashion complex cross-dependencies |
| -- between several package declarations and bodies containing generics |
| -- can be compiled which otherwise would diagnose spurious circularities. |
| |
| -- For example, it is possible to compile two packages A and B that |
| -- have the following structure: |
| |
| -- package A is package B is |
| -- generic ... generic ... |
| -- package G_A is package G_B is |
| |
| -- with B; with A; |
| -- package body A is package body B is |
| -- package N_B is new G_B (..) package N_A is new G_A (..) |
| |
| -- The table Pending_Instantiations in package Inline is used to keep |
| -- track of body instantiations that are delayed in this manner. Inline |
| -- handles the actual calls to do the body instantiations. This activity |
| -- is part of Inline, since the processing occurs at the same point, and |
| -- for essentially the same reason, as the handling of inlined routines. |
| |
| ---------------------------------------------- |
| -- Detection of Instantiation Circularities -- |
| ---------------------------------------------- |
| |
| -- If we have a chain of instantiations that is circular, this is a |
| -- static error which must be detected at compile time. The detection |
| -- of these circularities is carried out at the point that we insert |
| -- a generic instance spec or body. If there is a circularity, then |
| -- the analysis of the offending spec or body will eventually result |
| -- in trying to load the same unit again, and we detect this problem |
| -- as we analyze the package instantiation for the second time. |
| |
| -- At least in some cases after we have detected the circularity, we |
| -- get into trouble if we try to keep going. The following flag is |
| -- set if a circularity is detected, and used to abandon compilation |
| -- after the messages have been posted. |
| |
| Circularity_Detected : Boolean := False; |
| -- This should really be reset on encountering a new main unit, but in |
| -- practice we are not using multiple main units so it is not critical. |
| |
| ----------------------- |
| -- Local subprograms -- |
| ----------------------- |
| |
| procedure Abandon_Instantiation (N : Node_Id); |
| pragma No_Return (Abandon_Instantiation); |
| -- Posts an error message "instantiation abandoned" at the indicated |
| -- node and then raises the exception Instantiation_Error to do it. |
| |
| procedure Analyze_Formal_Array_Type |
| (T : in out Entity_Id; |
| Def : Node_Id); |
| -- A formal array type is treated like an array type declaration, and |
| -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is |
| -- in-out, because in the case of an anonymous type the entity is |
| -- actually created in the procedure. |
| |
| -- The following procedures treat other kinds of formal parameters. |
| |
| procedure Analyze_Formal_Derived_Type |
| (N : Node_Id; |
| T : Entity_Id; |
| Def : Node_Id); |
| |
| -- The following subprograms create abbreviated declarations for formal |
| -- scalar types. We introduce an anonymous base of the proper class for |
| -- each of them, and define the formals as constrained first subtypes of |
| -- their bases. The bounds are expressions that are non-static in the |
| -- generic. |
| |
| procedure Analyze_Formal_Decimal_Fixed_Point_Type |
| (T : Entity_Id; Def : Node_Id); |
| procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id); |
| procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id); |
| procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id); |
| procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id); |
| procedure Analyze_Formal_Ordinary_Fixed_Point_Type |
| (T : Entity_Id; Def : Node_Id); |
| |
| procedure Analyze_Formal_Private_Type |
| (N : Node_Id; |
| T : Entity_Id; |
| Def : Node_Id); |
| -- This needs comments??? |
| |
| procedure Analyze_Generic_Formal_Part (N : Node_Id); |
| |
| procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id); |
| -- This needs comments ??? |
| |
| function Analyze_Associations |
| (I_Node : Node_Id; |
| Formals : List_Id; |
| F_Copy : List_Id) return List_Id; |
| -- At instantiation time, build the list of associations between formals |
| -- and actuals. Each association becomes a renaming declaration for the |
| -- formal entity. F_Copy is the analyzed list of formals in the generic |
| -- copy. It is used to apply legality checks to the actuals. I_Node is the |
| -- instantiation node itself. |
| |
| procedure Analyze_Subprogram_Instantiation |
| (N : Node_Id; |
| K : Entity_Kind); |
| |
| procedure Build_Instance_Compilation_Unit_Nodes |
| (N : Node_Id; |
| Act_Body : Node_Id; |
| Act_Decl : Node_Id); |
| -- This procedure is used in the case where the generic instance of a |
| -- subprogram body or package body is a library unit. In this case, the |
| -- original library unit node for the generic instantiation must be |
| -- replaced by the resulting generic body, and a link made to a new |
| -- compilation unit node for the generic declaration. The argument N is |
| -- the original generic instantiation. Act_Body and Act_Decl are the body |
| -- and declaration of the instance (either package body and declaration |
| -- nodes or subprogram body and declaration nodes depending on the case). |
| -- On return, the node N has been rewritten with the actual body. |
| |
| procedure Check_Formal_Packages (P_Id : Entity_Id); |
| -- Apply the following to all formal packages in generic associations. |
| |
| procedure Check_Formal_Package_Instance |
| (Formal_Pack : Entity_Id; |
| Actual_Pack : Entity_Id); |
| -- Verify that the actuals of the actual instance match the actuals of |
| -- the template for a formal package that is not declared with a box. |
| |
| procedure Check_Forward_Instantiation (Decl : Node_Id); |
| -- If the generic is a local entity and the corresponding body has not |
| -- been seen yet, flag enclosing packages to indicate that it will be |
| -- elaborated after the generic body. Subprograms declared in the same |
| -- package cannot be inlined by the front-end because front-end inlining |
| -- requires a strict linear order of elaboration. |
| |
| procedure Check_Hidden_Child_Unit |
| (N : Node_Id; |
| Gen_Unit : Entity_Id; |
| Act_Decl_Id : Entity_Id); |
| -- If the generic unit is an implicit child instance within a parent |
| -- instance, we need to make an explicit test that it is not hidden by |
| -- a child instance of the same name and parent. |
| |
| procedure Check_Private_View (N : Node_Id); |
| -- Check whether the type of a generic entity has a different view between |
| -- the point of generic analysis and the point of instantiation. If the |
| -- view has changed, then at the point of instantiation we restore the |
| -- correct view to perform semantic analysis of the instance, and reset |
| -- the current view after instantiation. The processing is driven by the |
| -- current private status of the type of the node, and Has_Private_View, |
| -- a flag that is set at the point of generic compilation. If view and |
| -- flag are inconsistent then the type is updated appropriately. |
| |
| procedure Check_Generic_Actuals |
| (Instance : Entity_Id; |
| Is_Formal_Box : Boolean); |
| -- Similar to previous one. Check the actuals in the instantiation, |
| -- whose views can change between the point of instantiation and the point |
| -- of instantiation of the body. In addition, mark the generic renamings |
| -- as generic actuals, so that they are not compatible with other actuals. |
| -- Recurse on an actual that is a formal package whose declaration has |
| -- a box. |
| |
| function Contains_Instance_Of |
| (Inner : Entity_Id; |
| Outer : Entity_Id; |
| N : Node_Id) return Boolean; |
| -- Inner is instantiated within the generic Outer. Check whether Inner |
| -- directly or indirectly contains an instance of Outer or of one of its |
| -- parents, in the case of a subunit. Each generic unit holds a list of |
| -- the entities instantiated within (at any depth). This procedure |
| -- determines whether the set of such lists contains a cycle, i.e. an |
| -- illegal circular instantiation. |
| |
| function Denotes_Formal_Package |
| (Pack : Entity_Id; |
| On_Exit : Boolean := False) return Boolean; |
| -- Returns True if E is a formal package of an enclosing generic, or |
| -- the actual for such a formal in an enclosing instantiation. If such |
| -- a package is used as a formal in an nested generic, or as an actual |
| -- in a nested instantiation, the visibility of ITS formals should not |
| -- be modified. When called from within Restore_Private_Views, the flag |
| -- On_Exit is true, to indicate that the search for a possible enclosing |
| -- instance should ignore the current one. |
| |
| function Find_Actual_Type |
| (Typ : Entity_Id; |
| Gen_Scope : Entity_Id) return Entity_Id; |
| -- When validating the actual types of a child instance, check whether |
| -- the formal is a formal type of the parent unit, and retrieve the current |
| -- actual for it. Typ is the entity in the analyzed formal type declaration |
| -- (component or index type of an array type) and Gen_Scope is the scope of |
| -- the analyzed formal array type. |
| |
| function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id; |
| -- Given the entity of a unit that is an instantiation, retrieve the |
| -- original instance node. This is used when loading the instantiations |
| -- of the ancestors of a child generic that is being instantiated. |
| |
| function In_Same_Declarative_Part |
| (F_Node : Node_Id; |
| Inst : Node_Id) return Boolean; |
| -- True if the instantiation Inst and the given freeze_node F_Node appear |
| -- within the same declarative part, ignoring subunits, but with no inter- |
| -- vening suprograms or concurrent units. If true, the freeze node |
| -- of the instance can be placed after the freeze node of the parent, |
| -- which it itself an instance. |
| |
| function In_Main_Context (E : Entity_Id) return Boolean; |
| -- Check whether an instantiation is in the context of the main unit. |
| -- Used to determine whether its body should be elaborated to allow |
| -- front-end inlining. |
| |
| procedure Set_Instance_Env |
| (Gen_Unit : Entity_Id; |
| Act_Unit : Entity_Id); |
| -- Save current instance on saved environment, to be used to determine |
| -- the global status of entities in nested instances. Part of Save_Env. |
| -- called after verifying that the generic unit is legal for the instance. |
| |
| procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id); |
| -- Associate analyzed generic parameter with corresponding |
| -- instance. Used for semantic checks at instantiation time. |
| |
| function Has_Been_Exchanged (E : Entity_Id) return Boolean; |
| -- Traverse the Exchanged_Views list to see if a type was private |
| -- and has already been flipped during this phase of instantiation. |
| |
| procedure Hide_Current_Scope; |
| -- When compiling a generic child unit, the parent context must be |
| -- present, but the instance and all entities that may be generated |
| -- must be inserted in the current scope. We leave the current scope |
| -- on the stack, but make its entities invisible to avoid visibility |
| -- problems. This is reversed at the end of instantiations. This is |
| -- not done for the instantiation of the bodies, which only require the |
| -- instances of the generic parents to be in scope. |
| |
| procedure Install_Body |
| (Act_Body : Node_Id; |
| N : Node_Id; |
| Gen_Body : Node_Id; |
| Gen_Decl : Node_Id); |
| -- If the instantiation happens textually before the body of the generic, |
| -- the instantiation of the body must be analyzed after the generic body, |
| -- and not at the point of instantiation. Such early instantiations can |
| -- happen if the generic and the instance appear in a package declaration |
| -- because the generic body can only appear in the corresponding package |
| -- body. Early instantiations can also appear if generic, instance and |
| -- body are all in the declarative part of a subprogram or entry. Entities |
| -- of packages that are early instantiations are delayed, and their freeze |
| -- node appears after the generic body. |
| |
| procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id); |
| -- Insert freeze node at the end of the declarative part that includes the |
| -- instance node N. If N is in the visible part of an enclosing package |
| -- declaration, the freeze node has to be inserted at the end of the |
| -- private declarations, if any. |
| |
| procedure Freeze_Subprogram_Body |
| (Inst_Node : Node_Id; |
| Gen_Body : Node_Id; |
| Pack_Id : Entity_Id); |
| -- The generic body may appear textually after the instance, including |
| -- in the proper body of a stub, or within a different package instance. |
| -- Given that the instance can only be elaborated after the generic, we |
| -- place freeze_nodes for the instance and/or for packages that may enclose |
| -- the instance and the generic, so that the back-end can establish the |
| -- proper order of elaboration. |
| |
| procedure Init_Env; |
| -- Establish environment for subsequent instantiation. Separated from |
| -- Save_Env because data-structures for visibility handling must be |
| -- initialized before call to Check_Generic_Child_Unit. |
| |
| procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False); |
| -- When compiling an instance of a child unit the parent (which is |
| -- itself an instance) is an enclosing scope that must be made |
| -- immediately visible. This procedure is also used to install the non- |
| -- generic parent of a generic child unit when compiling its body, so that |
| -- full views of types in the parent are made visible. |
| |
| procedure Remove_Parent (In_Body : Boolean := False); |
| -- Reverse effect after instantiation of child is complete. |
| |
| procedure Inline_Instance_Body |
| (N : Node_Id; |
| Gen_Unit : Entity_Id; |
| Act_Decl : Node_Id); |
| -- If front-end inlining is requested, instantiate the package body, |
| -- and preserve the visibility of its compilation unit, to insure |
| -- that successive instantiations succeed. |
| |
| -- The functions Instantiate_XXX perform various legality checks and build |
| -- the declarations for instantiated generic parameters. |
| -- Need to describe what the parameters are ??? |
| |
| function Instantiate_Object |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id) return List_Id; |
| |
| function Instantiate_Type |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id; |
| Actual_Decls : List_Id) return Node_Id; |
| |
| function Instantiate_Formal_Subprogram |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id) return Node_Id; |
| |
| function Instantiate_Formal_Package |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id) return List_Id; |
| -- If the formal package is declared with a box, special visibility rules |
| -- apply to its formals: they are in the visible part of the package. This |
| -- is true in the declarative region of the formal package, that is to say |
| -- in the enclosing generic or instantiation. For an instantiation, the |
| -- parameters of the formal package are made visible in an explicit step. |
| -- Furthermore, if the actual is a visible use_clause, these formals must |
| -- be made potentially use_visible as well. On exit from the enclosing |
| -- instantiation, the reverse must be done. |
| |
| -- For a formal package declared without a box, there are conformance rules |
| -- that apply to the actuals in the generic declaration and the actuals of |
| -- the actual package in the enclosing instantiation. The simplest way to |
| -- apply these rules is to repeat the instantiation of the formal package |
| -- in the context of the enclosing instance, and compare the generic |
| -- associations of this instantiation with those of the actual package. |
| |
| function Is_In_Main_Unit (N : Node_Id) return Boolean; |
| -- Test if given node is in the main unit |
| |
| procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id); |
| -- If the generic appears in a separate non-generic library unit, |
| -- load the corresponding body to retrieve the body of the generic. |
| -- N is the node for the generic instantiation, Spec is the generic |
| -- package declaration. |
| |
| procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id); |
| -- Add the context clause of the unit containing a generic unit to |
| -- an instantiation that is a compilation unit. |
| |
| function Get_Associated_Node (N : Node_Id) return Node_Id; |
| -- In order to propagate semantic information back from the analyzed |
| -- copy to the original generic, we maintain links between selected nodes |
| -- in the generic and their corresponding copies. At the end of generic |
| -- analysis, the routine Save_Global_References traverses the generic |
| -- tree, examines the semantic information, and preserves the links to |
| -- those nodes that contain global information. At instantiation, the |
| -- information from the associated node is placed on the new copy, so |
| -- that name resolution is not repeated. |
| -- |
| -- Three kinds of source nodes have associated nodes: |
| -- |
| -- a) those that can reference (denote) entities, that is identifiers, |
| -- character literals, expanded_names, operator symbols, operators, |
| -- and attribute reference nodes. These nodes have an Entity field |
| -- and are the set of nodes that are in N_Has_Entity. |
| -- |
| -- b) aggregates (N_Aggregate and N_Extension_Aggregate) |
| -- |
| -- c) selected components (N_Selected_Component) |
| -- |
| -- For the first class, the associated node preserves the entity if it is |
| -- global. If the generic contains nested instantiations, the associated |
| -- node itself has been recopied, and a chain of them must be followed. |
| -- |
| -- For aggregates, the associated node allows retrieval of the type, which |
| -- may otherwise not appear in the generic. The view of this type may be |
| -- different between generic and instantiation, and the full view can be |
| -- installed before the instantiation is analyzed. For aggregates of |
| -- type extensions, the same view exchange may have to be performed for |
| -- some of the ancestor types, if their view is private at the point of |
| -- instantiation. |
| -- |
| -- Nodes that are selected components in the parse tree may be rewritten |
| -- as expanded names after resolution, and must be treated as potential |
| -- entity holders. which is why they also have an Associated_Node. |
| -- |
| -- Nodes that do not come from source, such as freeze nodes, do not appear |
| -- in the generic tree, and need not have an associated node. |
| -- |
| -- The associated node is stored in the Associated_Node field. Note that |
| -- this field overlaps Entity, which is fine, because the whole point is |
| -- that we don't need or want the normal Entity field in this situation. |
| |
| procedure Move_Freeze_Nodes |
| (Out_Of : Entity_Id; |
| After : Node_Id; |
| L : List_Id); |
| -- Freeze nodes can be generated in the analysis of a generic unit, but |
| -- will not be seen by the back-end. It is necessary to move those nodes |
| -- to the enclosing scope if they freeze an outer entity. We place them |
| -- at the end of the enclosing generic package, which is semantically |
| -- neutral. |
| |
| procedure Pre_Analyze_Actuals (N : Node_Id); |
| -- Analyze actuals to perform name resolution. Full resolution is done |
| -- later, when the expected types are known, but names have to be captured |
| -- before installing parents of generics, that are not visible for the |
| -- actuals themselves. |
| |
| procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id); |
| -- Verify that an attribute that appears as the default for a formal |
| -- subprogram is a function or procedure with the correct profile. |
| |
| ------------------------------------------- |
| -- Data Structures for Generic Renamings -- |
| ------------------------------------------- |
| |
| -- The map Generic_Renamings associates generic entities with their |
| -- corresponding actuals. Currently used to validate type instances. |
| -- It will eventually be used for all generic parameters to eliminate |
| -- the need for overload resolution in the instance. |
| |
| type Assoc_Ptr is new Int; |
| |
| Assoc_Null : constant Assoc_Ptr := -1; |
| |
| type Assoc is record |
| Gen_Id : Entity_Id; |
| Act_Id : Entity_Id; |
| Next_In_HTable : Assoc_Ptr; |
| end record; |
| |
| package Generic_Renamings is new Table.Table |
| (Table_Component_Type => Assoc, |
| Table_Index_Type => Assoc_Ptr, |
| Table_Low_Bound => 0, |
| Table_Initial => 10, |
| Table_Increment => 100, |
| Table_Name => "Generic_Renamings"); |
| |
| -- Variable to hold enclosing instantiation. When the environment is |
| -- saved for a subprogram inlining, the corresponding Act_Id is empty. |
| |
| Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null); |
| |
| -- Hash table for associations |
| |
| HTable_Size : constant := 37; |
| type HTable_Range is range 0 .. HTable_Size - 1; |
| |
| procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr); |
| function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr; |
| function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id; |
| function Hash (F : Entity_Id) return HTable_Range; |
| |
| package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable ( |
| Header_Num => HTable_Range, |
| Element => Assoc, |
| Elmt_Ptr => Assoc_Ptr, |
| Null_Ptr => Assoc_Null, |
| Set_Next => Set_Next_Assoc, |
| Next => Next_Assoc, |
| Key => Entity_Id, |
| Get_Key => Get_Gen_Id, |
| Hash => Hash, |
| Equal => "="); |
| |
| Exchanged_Views : Elist_Id; |
| -- This list holds the private views that have been exchanged during |
| -- instantiation to restore the visibility of the generic declaration. |
| -- (see comments above). After instantiation, the current visibility is |
| -- reestablished by means of a traversal of this list. |
| |
| Hidden_Entities : Elist_Id; |
| -- This list holds the entities of the current scope that are removed |
| -- from immediate visibility when instantiating a child unit. Their |
| -- visibility is restored in Remove_Parent. |
| |
| -- Because instantiations can be recursive, the following must be saved |
| -- on entry and restored on exit from an instantiation (spec or body). |
| -- This is done by the two procedures Save_Env and Restore_Env. For |
| -- package and subprogram instantiations (but not for the body instances) |
| -- the action of Save_Env is done in two steps: Init_Env is called before |
| -- Check_Generic_Child_Unit, because setting the parent instances requires |
| -- that the visibility data structures be properly initialized. Once the |
| -- generic is unit is validated, Set_Instance_Env completes Save_Env. |
| |
| type Instance_Env is record |
| Ada_Version : Ada_Version_Type; |
| Instantiated_Parent : Assoc; |
| Exchanged_Views : Elist_Id; |
| Hidden_Entities : Elist_Id; |
| Current_Sem_Unit : Unit_Number_Type; |
| end record; |
| |
| package Instance_Envs is new Table.Table ( |
| Table_Component_Type => Instance_Env, |
| Table_Index_Type => Int, |
| Table_Low_Bound => 0, |
| Table_Initial => 32, |
| Table_Increment => 100, |
| Table_Name => "Instance_Envs"); |
| |
| procedure Restore_Private_Views |
| (Pack_Id : Entity_Id; |
| Is_Package : Boolean := True); |
| -- Restore the private views of external types, and unmark the generic |
| -- renamings of actuals, so that they become comptible subtypes again. |
| -- For subprograms, Pack_Id is the package constructed to hold the |
| -- renamings. |
| |
| procedure Switch_View (T : Entity_Id); |
| -- Switch the partial and full views of a type and its private |
| -- dependents (i.e. its subtypes and derived types). |
| |
| ------------------------------------ |
| -- Structures for Error Reporting -- |
| ------------------------------------ |
| |
| Instantiation_Node : Node_Id; |
| -- Used by subprograms that validate instantiation of formal parameters |
| -- where there might be no actual on which to place the error message. |
| -- Also used to locate the instantiation node for generic subunits. |
| |
| Instantiation_Error : exception; |
| -- When there is a semantic error in the generic parameter matching, |
| -- there is no point in continuing the instantiation, because the |
| -- number of cascaded errors is unpredictable. This exception aborts |
| -- the instantiation process altogether. |
| |
| S_Adjustment : Sloc_Adjustment; |
| -- Offset created for each node in an instantiation, in order to keep |
| -- track of the source position of the instantiation in each of its nodes. |
| -- A subsequent semantic error or warning on a construct of the instance |
| -- points to both places: the original generic node, and the point of |
| -- instantiation. See Sinput and Sinput.L for additional details. |
| |
| ------------------------------------------------------------ |
| -- Data structure for keeping track when inside a Generic -- |
| ------------------------------------------------------------ |
| |
| -- The following table is used to save values of the Inside_A_Generic |
| -- flag (see spec of Sem) when they are saved by Start_Generic. |
| |
| package Generic_Flags is new Table.Table ( |
| Table_Component_Type => Boolean, |
| Table_Index_Type => Int, |
| Table_Low_Bound => 0, |
| Table_Initial => 32, |
| Table_Increment => 200, |
| Table_Name => "Generic_Flags"); |
| |
| --------------------------- |
| -- Abandon_Instantiation -- |
| --------------------------- |
| |
| procedure Abandon_Instantiation (N : Node_Id) is |
| begin |
| Error_Msg_N ("instantiation abandoned!", N); |
| raise Instantiation_Error; |
| end Abandon_Instantiation; |
| |
| -------------------------- |
| -- Analyze_Associations -- |
| -------------------------- |
| |
| function Analyze_Associations |
| (I_Node : Node_Id; |
| Formals : List_Id; |
| F_Copy : List_Id) return List_Id |
| is |
| Actual_Types : constant Elist_Id := New_Elmt_List; |
| Assoc : constant List_Id := New_List; |
| Defaults : constant Elist_Id := New_Elmt_List; |
| Gen_Unit : constant Entity_Id := Defining_Entity (Parent (F_Copy)); |
| Actuals : List_Id; |
| Actual : Node_Id; |
| Formal : Node_Id; |
| Next_Formal : Node_Id; |
| Temp_Formal : Node_Id; |
| Analyzed_Formal : Node_Id; |
| Match : Node_Id; |
| Named : Node_Id; |
| First_Named : Node_Id := Empty; |
| Found_Assoc : Node_Id; |
| Is_Named_Assoc : Boolean; |
| Num_Matched : Int := 0; |
| Num_Actuals : Int := 0; |
| |
| function Matching_Actual |
| (F : Entity_Id; |
| A_F : Entity_Id) return Node_Id; |
| -- Find actual that corresponds to a given a formal parameter. If the |
| -- actuals are positional, return the next one, if any. If the actuals |
| -- are named, scan the parameter associations to find the right one. |
| -- A_F is the corresponding entity in the analyzed generic,which is |
| -- placed on the selector name for ASIS use. |
| |
| procedure Set_Analyzed_Formal; |
| -- Find the node in the generic copy that corresponds to a given formal. |
| -- The semantic information on this node is used to perform legality |
| -- checks on the actuals. Because semantic analysis can introduce some |
| -- anonymous entities or modify the declaration node itself, the |
| -- correspondence between the two lists is not one-one. In addition to |
| -- anonymous types, the presence a formal equality will introduce an |
| -- implicit declaration for the corresponding inequality. |
| |
| --------------------- |
| -- Matching_Actual -- |
| --------------------- |
| |
| function Matching_Actual |
| (F : Entity_Id; |
| A_F : Entity_Id) return Node_Id |
| is |
| Found : Node_Id; |
| Prev : Node_Id; |
| |
| begin |
| Is_Named_Assoc := False; |
| |
| -- End of list of purely positional parameters |
| |
| if No (Actual) then |
| Found := Empty; |
| |
| -- Case of positional parameter corresponding to current formal |
| |
| elsif No (Selector_Name (Actual)) then |
| Found := Explicit_Generic_Actual_Parameter (Actual); |
| Found_Assoc := Actual; |
| Num_Matched := Num_Matched + 1; |
| Next (Actual); |
| |
| -- Otherwise scan list of named actuals to find the one with the |
| -- desired name. All remaining actuals have explicit names. |
| |
| else |
| Is_Named_Assoc := True; |
| Found := Empty; |
| Prev := Empty; |
| |
| while Present (Actual) loop |
| if Chars (Selector_Name (Actual)) = Chars (F) then |
| Found := Explicit_Generic_Actual_Parameter (Actual); |
| Set_Entity (Selector_Name (Actual), A_F); |
| Set_Etype (Selector_Name (Actual), Etype (A_F)); |
| Generate_Reference (A_F, Selector_Name (Actual)); |
| Found_Assoc := Actual; |
| Num_Matched := Num_Matched + 1; |
| exit; |
| end if; |
| |
| Prev := Actual; |
| Next (Actual); |
| end loop; |
| |
| -- Reset for subsequent searches. In most cases the named |
| -- associations are in order. If they are not, we reorder them |
| -- to avoid scanning twice the same actual. This is not just a |
| -- question of efficiency: there may be multiple defaults with |
| -- boxes that have the same name. In a nested instantiation we |
| -- insert actuals for those defaults, and cannot rely on their |
| -- names to disambiguate them. |
| |
| if Actual = First_Named then |
| Next (First_Named); |
| |
| elsif Present (Actual) then |
| Insert_Before (First_Named, Remove_Next (Prev)); |
| end if; |
| |
| Actual := First_Named; |
| end if; |
| |
| return Found; |
| end Matching_Actual; |
| |
| ------------------------- |
| -- Set_Analyzed_Formal -- |
| ------------------------- |
| |
| procedure Set_Analyzed_Formal is |
| Kind : Node_Kind; |
| begin |
| while Present (Analyzed_Formal) loop |
| Kind := Nkind (Analyzed_Formal); |
| |
| case Nkind (Formal) is |
| |
| when N_Formal_Subprogram_Declaration => |
| exit when Kind in N_Formal_Subprogram_Declaration |
| and then |
| Chars |
| (Defining_Unit_Name (Specification (Formal))) = |
| Chars |
| (Defining_Unit_Name (Specification (Analyzed_Formal))); |
| |
| when N_Formal_Package_Declaration => |
| exit when |
| Kind = N_Formal_Package_Declaration |
| or else |
| Kind = N_Generic_Package_Declaration; |
| |
| when N_Use_Package_Clause | N_Use_Type_Clause => exit; |
| |
| when others => |
| |
| -- Skip freeze nodes, and nodes inserted to replace |
| -- unrecognized pragmas. |
| |
| exit when |
| Kind not in N_Formal_Subprogram_Declaration |
| and then Kind /= N_Subprogram_Declaration |
| and then Kind /= N_Freeze_Entity |
| and then Kind /= N_Null_Statement |
| and then Kind /= N_Itype_Reference |
| and then Chars (Defining_Identifier (Formal)) = |
| Chars (Defining_Identifier (Analyzed_Formal)); |
| end case; |
| |
| Next (Analyzed_Formal); |
| end loop; |
| |
| end Set_Analyzed_Formal; |
| |
| -- Start of processing for Analyze_Associations |
| |
| begin |
| -- If named associations are present, save the first named association |
| -- (it may of course be Empty) to facilitate subsequent name search. |
| |
| Actuals := Generic_Associations (I_Node); |
| |
| if Present (Actuals) then |
| First_Named := First (Actuals); |
| |
| while Present (First_Named) |
| and then No (Selector_Name (First_Named)) |
| loop |
| Num_Actuals := Num_Actuals + 1; |
| Next (First_Named); |
| end loop; |
| end if; |
| |
| Named := First_Named; |
| while Present (Named) loop |
| if No (Selector_Name (Named)) then |
| Error_Msg_N ("invalid positional actual after named one", Named); |
| Abandon_Instantiation (Named); |
| end if; |
| |
| -- A named association may lack an actual parameter, if it was |
| -- introduced for a default subprogram that turns out to be local |
| -- to the outer instantiation. |
| |
| if Present (Explicit_Generic_Actual_Parameter (Named)) then |
| Num_Actuals := Num_Actuals + 1; |
| end if; |
| |
| Next (Named); |
| end loop; |
| |
| if Present (Formals) then |
| Formal := First_Non_Pragma (Formals); |
| Analyzed_Formal := First_Non_Pragma (F_Copy); |
| |
| if Present (Actuals) then |
| Actual := First (Actuals); |
| |
| -- All formals should have default values |
| |
| else |
| Actual := Empty; |
| end if; |
| |
| while Present (Formal) loop |
| Set_Analyzed_Formal; |
| Next_Formal := Next_Non_Pragma (Formal); |
| |
| case Nkind (Formal) is |
| when N_Formal_Object_Declaration => |
| Match := |
| Matching_Actual ( |
| Defining_Identifier (Formal), |
| Defining_Identifier (Analyzed_Formal)); |
| |
| Append_List |
| (Instantiate_Object (Formal, Match, Analyzed_Formal), |
| Assoc); |
| |
| when N_Formal_Type_Declaration => |
| Match := |
| Matching_Actual ( |
| Defining_Identifier (Formal), |
| Defining_Identifier (Analyzed_Formal)); |
| |
| if No (Match) then |
| Error_Msg_Sloc := Sloc (Gen_Unit); |
| Error_Msg_NE |
| ("missing actual&", |
| Instantiation_Node, Defining_Identifier (Formal)); |
| Error_Msg_NE ("\in instantiation of & declared#", |
| Instantiation_Node, Gen_Unit); |
| Abandon_Instantiation (Instantiation_Node); |
| |
| else |
| Analyze (Match); |
| Append_To (Assoc, |
| Instantiate_Type |
| (Formal, Match, Analyzed_Formal, Assoc)); |
| |
| -- an instantiation is a freeze point for the actuals, |
| -- unless this is a rewritten formal package. |
| |
| if Nkind (I_Node) /= N_Formal_Package_Declaration then |
| Append_Elmt (Entity (Match), Actual_Types); |
| end if; |
| end if; |
| |
| -- A remote access-to-class-wide type must not be an |
| -- actual parameter for a generic formal of an access |
| -- type (E.2.2 (17)). |
| |
| if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration |
| and then |
| Nkind (Formal_Type_Definition (Analyzed_Formal)) = |
| N_Access_To_Object_Definition |
| then |
| Validate_Remote_Access_To_Class_Wide_Type (Match); |
| end if; |
| |
| when N_Formal_Subprogram_Declaration => |
| Match := |
| Matching_Actual ( |
| Defining_Unit_Name (Specification (Formal)), |
| Defining_Unit_Name (Specification (Analyzed_Formal))); |
| |
| -- If the formal subprogram has the same name as |
| -- another formal subprogram of the generic, then |
| -- a named association is illegal (12.3(9)). Exclude |
| -- named associations that are generated for a nested |
| -- instance. |
| |
| if Present (Match) |
| and then Is_Named_Assoc |
| and then Comes_From_Source (Found_Assoc) |
| then |
| Temp_Formal := First (Formals); |
| while Present (Temp_Formal) loop |
| if Nkind (Temp_Formal) in |
| N_Formal_Subprogram_Declaration |
| and then Temp_Formal /= Formal |
| and then |
| Chars (Selector_Name (Found_Assoc)) = |
| Chars (Defining_Unit_Name |
| (Specification (Temp_Formal))) |
| then |
| Error_Msg_N |
| ("name not allowed for overloaded formal", |
| Found_Assoc); |
| Abandon_Instantiation (Instantiation_Node); |
| end if; |
| |
| Next (Temp_Formal); |
| end loop; |
| end if; |
| |
| Append_To (Assoc, |
| Instantiate_Formal_Subprogram |
| (Formal, Match, Analyzed_Formal)); |
| |
| if No (Match) |
| and then Box_Present (Formal) |
| then |
| Append_Elmt |
| (Defining_Unit_Name (Specification (Last (Assoc))), |
| Defaults); |
| end if; |
| |
| when N_Formal_Package_Declaration => |
| Match := |
| Matching_Actual ( |
| Defining_Identifier (Formal), |
| Defining_Identifier (Original_Node (Analyzed_Formal))); |
| |
| if No (Match) then |
| Error_Msg_Sloc := Sloc (Gen_Unit); |
| Error_Msg_NE |
| ("missing actual&", |
| Instantiation_Node, Defining_Identifier (Formal)); |
| Error_Msg_NE ("\in instantiation of & declared#", |
| Instantiation_Node, Gen_Unit); |
| |
| Abandon_Instantiation (Instantiation_Node); |
| |
| else |
| Analyze (Match); |
| Append_List |
| (Instantiate_Formal_Package |
| (Formal, Match, Analyzed_Formal), |
| Assoc); |
| end if; |
| |
| -- For use type and use package appearing in the context |
| -- clause, we have already copied them, so we can just |
| -- move them where they belong (we mustn't recopy them |
| -- since this would mess up the Sloc values). |
| |
| when N_Use_Package_Clause | |
| N_Use_Type_Clause => |
| Remove (Formal); |
| Append (Formal, Assoc); |
| |
| when others => |
| raise Program_Error; |
| |
| end case; |
| |
| Formal := Next_Formal; |
| Next_Non_Pragma (Analyzed_Formal); |
| end loop; |
| |
| if Num_Actuals > Num_Matched then |
| Error_Msg_Sloc := Sloc (Gen_Unit); |
| |
| if Present (Selector_Name (Actual)) then |
| Error_Msg_NE |
| ("unmatched actual&", |
| Actual, Selector_Name (Actual)); |
| Error_Msg_NE ("\in instantiation of& declared#", |
| Actual, Gen_Unit); |
| else |
| Error_Msg_NE |
| ("unmatched actual in instantiation of& declared#", |
| Actual, Gen_Unit); |
| end if; |
| end if; |
| |
| elsif Present (Actuals) then |
| Error_Msg_N |
| ("too many actuals in generic instantiation", Instantiation_Node); |
| end if; |
| |
| declare |
| Elmt : Elmt_Id := First_Elmt (Actual_Types); |
| |
| begin |
| while Present (Elmt) loop |
| Freeze_Before (I_Node, Node (Elmt)); |
| Next_Elmt (Elmt); |
| end loop; |
| end; |
| |
| -- If there are default subprograms, normalize the tree by adding |
| -- explicit associations for them. This is required if the instance |
| -- appears within a generic. |
| |
| declare |
| Elmt : Elmt_Id; |
| Subp : Entity_Id; |
| New_D : Node_Id; |
| |
| begin |
| Elmt := First_Elmt (Defaults); |
| while Present (Elmt) loop |
| if No (Actuals) then |
| Actuals := New_List; |
| Set_Generic_Associations (I_Node, Actuals); |
| end if; |
| |
| Subp := Node (Elmt); |
| New_D := |
| Make_Generic_Association (Sloc (Subp), |
| Selector_Name => New_Occurrence_Of (Subp, Sloc (Subp)), |
| Explicit_Generic_Actual_Parameter => |
| New_Occurrence_Of (Subp, Sloc (Subp))); |
| Mark_Rewrite_Insertion (New_D); |
| Append_To (Actuals, New_D); |
| Next_Elmt (Elmt); |
| end loop; |
| end; |
| |
| return Assoc; |
| end Analyze_Associations; |
| |
| ------------------------------- |
| -- Analyze_Formal_Array_Type -- |
| ------------------------------- |
| |
| procedure Analyze_Formal_Array_Type |
| (T : in out Entity_Id; |
| Def : Node_Id) |
| is |
| DSS : Node_Id; |
| |
| begin |
| -- Treated like a non-generic array declaration, with |
| -- additional semantic checks. |
| |
| Enter_Name (T); |
| |
| if Nkind (Def) = N_Constrained_Array_Definition then |
| DSS := First (Discrete_Subtype_Definitions (Def)); |
| while Present (DSS) loop |
| if Nkind (DSS) = N_Subtype_Indication |
| or else Nkind (DSS) = N_Range |
| or else Nkind (DSS) = N_Attribute_Reference |
| then |
| Error_Msg_N ("only a subtype mark is allowed in a formal", DSS); |
| end if; |
| |
| Next (DSS); |
| end loop; |
| end if; |
| |
| Array_Type_Declaration (T, Def); |
| Set_Is_Generic_Type (Base_Type (T)); |
| |
| if Ekind (Component_Type (T)) = E_Incomplete_Type |
| and then No (Full_View (Component_Type (T))) |
| then |
| Error_Msg_N ("premature usage of incomplete type", Def); |
| |
| -- Check that range constraint is not allowed on the component type |
| -- of a generic formal array type (AARM 12.5.3(3)) |
| |
| elsif Is_Internal (Component_Type (T)) |
| and then Present (Subtype_Indication (Component_Definition (Def))) |
| and then Nkind (Original_Node |
| (Subtype_Indication (Component_Definition (Def)))) |
| = N_Subtype_Indication |
| then |
| Error_Msg_N |
| ("in a formal, a subtype indication can only be " |
| & "a subtype mark ('R'M 12.5.3(3))", |
| Subtype_Indication (Component_Definition (Def))); |
| end if; |
| |
| end Analyze_Formal_Array_Type; |
| |
| --------------------------------------------- |
| -- Analyze_Formal_Decimal_Fixed_Point_Type -- |
| --------------------------------------------- |
| |
| -- As for other generic types, we create a valid type representation |
| -- with legal but arbitrary attributes, whose values are never considered |
| -- static. For all scalar types we introduce an anonymous base type, with |
| -- the same attributes. We choose the corresponding integer type to be |
| -- Standard_Integer. |
| |
| procedure Analyze_Formal_Decimal_Fixed_Point_Type |
| (T : Entity_Id; |
| Def : Node_Id) |
| is |
| Loc : constant Source_Ptr := Sloc (Def); |
| Base : constant Entity_Id := |
| New_Internal_Entity |
| (E_Decimal_Fixed_Point_Type, |
| Current_Scope, Sloc (Def), 'G'); |
| Int_Base : constant Entity_Id := Standard_Integer; |
| Delta_Val : constant Ureal := Ureal_1; |
| Digs_Val : constant Uint := Uint_6; |
| |
| begin |
| Enter_Name (T); |
| |
| Set_Etype (Base, Base); |
| Set_Size_Info (Base, Int_Base); |
| Set_RM_Size (Base, RM_Size (Int_Base)); |
| Set_First_Rep_Item (Base, First_Rep_Item (Int_Base)); |
| Set_Digits_Value (Base, Digs_Val); |
| Set_Delta_Value (Base, Delta_Val); |
| Set_Small_Value (Base, Delta_Val); |
| Set_Scalar_Range (Base, |
| Make_Range (Loc, |
| Low_Bound => Make_Real_Literal (Loc, Ureal_1), |
| High_Bound => Make_Real_Literal (Loc, Ureal_1))); |
| |
| Set_Is_Generic_Type (Base); |
| Set_Parent (Base, Parent (Def)); |
| |
| Set_Ekind (T, E_Decimal_Fixed_Point_Subtype); |
| Set_Etype (T, Base); |
| Set_Size_Info (T, Int_Base); |
| Set_RM_Size (T, RM_Size (Int_Base)); |
| Set_First_Rep_Item (T, First_Rep_Item (Int_Base)); |
| Set_Digits_Value (T, Digs_Val); |
| Set_Delta_Value (T, Delta_Val); |
| Set_Small_Value (T, Delta_Val); |
| Set_Scalar_Range (T, Scalar_Range (Base)); |
| Set_Is_Constrained (T); |
| |
| Check_Restriction (No_Fixed_Point, Def); |
| end Analyze_Formal_Decimal_Fixed_Point_Type; |
| |
| --------------------------------- |
| -- Analyze_Formal_Derived_Type -- |
| --------------------------------- |
| |
| procedure Analyze_Formal_Derived_Type |
| (N : Node_Id; |
| T : Entity_Id; |
| Def : Node_Id) |
| is |
| Loc : constant Source_Ptr := Sloc (Def); |
| Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N); |
| New_N : Node_Id; |
| |
| begin |
| Set_Is_Generic_Type (T); |
| |
| if Private_Present (Def) then |
| New_N := |
| Make_Private_Extension_Declaration (Loc, |
| Defining_Identifier => T, |
| Discriminant_Specifications => Discriminant_Specifications (N), |
| Unknown_Discriminants_Present => Unk_Disc, |
| Subtype_Indication => Subtype_Mark (Def)); |
| |
| Set_Abstract_Present (New_N, Abstract_Present (Def)); |
| |
| else |
| New_N := |
| Make_Full_Type_Declaration (Loc, |
| Defining_Identifier => T, |
| Discriminant_Specifications => |
| Discriminant_Specifications (Parent (T)), |
| Type_Definition => |
| Make_Derived_Type_Definition (Loc, |
| Subtype_Indication => Subtype_Mark (Def))); |
| |
| Set_Abstract_Present |
| (Type_Definition (New_N), Abstract_Present (Def)); |
| end if; |
| |
| Rewrite (N, New_N); |
| Analyze (N); |
| |
| if Unk_Disc then |
| if not Is_Composite_Type (T) then |
| Error_Msg_N |
| ("unknown discriminants not allowed for elementary types", N); |
| else |
| Set_Has_Unknown_Discriminants (T); |
| Set_Is_Constrained (T, False); |
| end if; |
| end if; |
| |
| -- If the parent type has a known size, so does the formal, which |
| -- makes legal representation clauses that involve the formal. |
| |
| Set_Size_Known_At_Compile_Time |
| (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def)))); |
| |
| end Analyze_Formal_Derived_Type; |
| |
| ---------------------------------- |
| -- Analyze_Formal_Discrete_Type -- |
| ---------------------------------- |
| |
| -- The operations defined for a discrete types are those of an |
| -- enumeration type. The size is set to an arbitrary value, for use |
| -- in analyzing the generic unit. |
| |
| procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (Def); |
| Lo : Node_Id; |
| Hi : Node_Id; |
| |
| Base : constant Entity_Id := |
| New_Internal_Entity |
| (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G'); |
| begin |
| Enter_Name (T); |
| Set_Ekind (T, E_Enumeration_Subtype); |
| Set_Etype (T, Base); |
| Init_Size (T, 8); |
| Init_Alignment (T); |
| Set_Is_Generic_Type (T); |
| Set_Is_Constrained (T); |
| |
| -- For semantic analysis, the bounds of the type must be set to some |
| -- non-static value. The simplest is to create attribute nodes for |
| -- those bounds, that refer to the type itself. These bounds are never |
| -- analyzed but serve as place-holders. |
| |
| Lo := |
| Make_Attribute_Reference (Loc, |
| Attribute_Name => Name_First, |
| Prefix => New_Reference_To (T, Loc)); |
| Set_Etype (Lo, T); |
| |
| Hi := |
| Make_Attribute_Reference (Loc, |
| Attribute_Name => Name_Last, |
| Prefix => New_Reference_To (T, Loc)); |
| Set_Etype (Hi, T); |
| |
| Set_Scalar_Range (T, |
| Make_Range (Loc, |
| Low_Bound => Lo, |
| High_Bound => Hi)); |
| |
| Set_Ekind (Base, E_Enumeration_Type); |
| Set_Etype (Base, Base); |
| Init_Size (Base, 8); |
| Init_Alignment (Base); |
| Set_Is_Generic_Type (Base); |
| Set_Scalar_Range (Base, Scalar_Range (T)); |
| Set_Parent (Base, Parent (Def)); |
| |
| end Analyze_Formal_Discrete_Type; |
| |
| ---------------------------------- |
| -- Analyze_Formal_Floating_Type -- |
| --------------------------------- |
| |
| procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is |
| Base : constant Entity_Id := |
| New_Internal_Entity |
| (E_Floating_Point_Type, Current_Scope, Sloc (Def), 'G'); |
| |
| begin |
| -- The various semantic attributes are taken from the predefined type |
| -- Float, just so that all of them are initialized. Their values are |
| -- never used because no constant folding or expansion takes place in |
| -- the generic itself. |
| |
| Enter_Name (T); |
| Set_Ekind (T, E_Floating_Point_Subtype); |
| Set_Etype (T, Base); |
| Set_Size_Info (T, (Standard_Float)); |
| Set_RM_Size (T, RM_Size (Standard_Float)); |
| Set_Digits_Value (T, Digits_Value (Standard_Float)); |
| Set_Scalar_Range (T, Scalar_Range (Standard_Float)); |
| Set_Is_Constrained (T); |
| |
| Set_Is_Generic_Type (Base); |
| Set_Etype (Base, Base); |
| Set_Size_Info (Base, (Standard_Float)); |
| Set_RM_Size (Base, RM_Size (Standard_Float)); |
| Set_Digits_Value (Base, Digits_Value (Standard_Float)); |
| Set_Scalar_Range (Base, Scalar_Range (Standard_Float)); |
| Set_Parent (Base, Parent (Def)); |
| |
| Check_Restriction (No_Floating_Point, Def); |
| end Analyze_Formal_Floating_Type; |
| |
| --------------------------------- |
| -- Analyze_Formal_Modular_Type -- |
| --------------------------------- |
| |
| procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is |
| begin |
| -- Apart from their entity kind, generic modular types are treated |
| -- like signed integer types, and have the same attributes. |
| |
| Analyze_Formal_Signed_Integer_Type (T, Def); |
| Set_Ekind (T, E_Modular_Integer_Subtype); |
| Set_Ekind (Etype (T), E_Modular_Integer_Type); |
| |
| end Analyze_Formal_Modular_Type; |
| |
| --------------------------------------- |
| -- Analyze_Formal_Object_Declaration -- |
| --------------------------------------- |
| |
| procedure Analyze_Formal_Object_Declaration (N : Node_Id) is |
| E : constant Node_Id := Expression (N); |
| Id : constant Node_Id := Defining_Identifier (N); |
| K : Entity_Kind; |
| T : Node_Id; |
| |
| begin |
| Enter_Name (Id); |
| |
| -- Determine the mode of the formal object |
| |
| if Out_Present (N) then |
| K := E_Generic_In_Out_Parameter; |
| |
| if not In_Present (N) then |
| Error_Msg_N ("formal generic objects cannot have mode OUT", N); |
| end if; |
| |
| else |
| K := E_Generic_In_Parameter; |
| end if; |
| |
| Find_Type (Subtype_Mark (N)); |
| T := Entity (Subtype_Mark (N)); |
| |
| if Ekind (T) = E_Incomplete_Type then |
| Error_Msg_N ("premature usage of incomplete type", Subtype_Mark (N)); |
| end if; |
| |
| if K = E_Generic_In_Parameter then |
| |
| -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals |
| |
| if Ada_Version < Ada_05 and then Is_Limited_Type (T) then |
| Error_Msg_N |
| ("generic formal of mode IN must not be of limited type", N); |
| Explain_Limited_Type (T, N); |
| end if; |
| |
| if Is_Abstract (T) then |
| Error_Msg_N |
| ("generic formal of mode IN must not be of abstract type", N); |
| end if; |
| |
| if Present (E) then |
| Analyze_Per_Use_Expression (E, T); |
| end if; |
| |
| Set_Ekind (Id, K); |
| Set_Etype (Id, T); |
| |
| -- Case of generic IN OUT parameter. |
| |
| else |
| -- If the formal has an unconstrained type, construct its |
| -- actual subtype, as is done for subprogram formals. In this |
| -- fashion, all its uses can refer to specific bounds. |
| |
| Set_Ekind (Id, K); |
| Set_Etype (Id, T); |
| |
| if (Is_Array_Type (T) |
| and then not Is_Constrained (T)) |
| or else |
| (Ekind (T) = E_Record_Type |
| and then Has_Discriminants (T)) |
| then |
| declare |
| Non_Freezing_Ref : constant Node_Id := |
| New_Reference_To (Id, Sloc (Id)); |
| Decl : Node_Id; |
| |
| begin |
| -- Make sure that the actual subtype doesn't generate |
| -- bogus freezing. |
| |
| Set_Must_Not_Freeze (Non_Freezing_Ref); |
| Decl := Build_Actual_Subtype (T, Non_Freezing_Ref); |
| Insert_Before_And_Analyze (N, Decl); |
| Set_Actual_Subtype (Id, Defining_Identifier (Decl)); |
| end; |
| else |
| Set_Actual_Subtype (Id, T); |
| end if; |
| |
| if Present (E) then |
| Error_Msg_N |
| ("initialization not allowed for `IN OUT` formals", N); |
| end if; |
| end if; |
| |
| end Analyze_Formal_Object_Declaration; |
| |
| ---------------------------------------------- |
| -- Analyze_Formal_Ordinary_Fixed_Point_Type -- |
| ---------------------------------------------- |
| |
| procedure Analyze_Formal_Ordinary_Fixed_Point_Type |
| (T : Entity_Id; |
| Def : Node_Id) |
| is |
| Loc : constant Source_Ptr := Sloc (Def); |
| Base : constant Entity_Id := |
| New_Internal_Entity |
| (E_Ordinary_Fixed_Point_Type, Current_Scope, Sloc (Def), 'G'); |
| begin |
| -- The semantic attributes are set for completeness only, their |
| -- values will never be used, because all properties of the type |
| -- are non-static. |
| |
| Enter_Name (T); |
| Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype); |
| Set_Etype (T, Base); |
| Set_Size_Info (T, Standard_Integer); |
| Set_RM_Size (T, RM_Size (Standard_Integer)); |
| Set_Small_Value (T, Ureal_1); |
| Set_Delta_Value (T, Ureal_1); |
| Set_Scalar_Range (T, |
| Make_Range (Loc, |
| Low_Bound => Make_Real_Literal (Loc, Ureal_1), |
| High_Bound => Make_Real_Literal (Loc, Ureal_1))); |
| Set_Is_Constrained (T); |
| |
| Set_Is_Generic_Type (Base); |
| Set_Etype (Base, Base); |
| Set_Size_Info (Base, Standard_Integer); |
| Set_RM_Size (Base, RM_Size (Standard_Integer)); |
| Set_Small_Value (Base, Ureal_1); |
| Set_Delta_Value (Base, Ureal_1); |
| Set_Scalar_Range (Base, Scalar_Range (T)); |
| Set_Parent (Base, Parent (Def)); |
| |
| Check_Restriction (No_Fixed_Point, Def); |
| end Analyze_Formal_Ordinary_Fixed_Point_Type; |
| |
| ---------------------------- |
| -- Analyze_Formal_Package -- |
| ---------------------------- |
| |
| procedure Analyze_Formal_Package (N : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Pack_Id : constant Entity_Id := Defining_Identifier (N); |
| Formal : Entity_Id; |
| Gen_Id : constant Node_Id := Name (N); |
| Gen_Decl : Node_Id; |
| Gen_Unit : Entity_Id; |
| New_N : Node_Id; |
| Parent_Installed : Boolean := False; |
| Renaming : Node_Id; |
| Parent_Instance : Entity_Id; |
| Renaming_In_Par : Entity_Id; |
| |
| begin |
| Text_IO_Kludge (Gen_Id); |
| |
| Init_Env; |
| Check_Generic_Child_Unit (Gen_Id, Parent_Installed); |
| Gen_Unit := Entity (Gen_Id); |
| |
| if Ekind (Gen_Unit) /= E_Generic_Package then |
| Error_Msg_N ("expect generic package name", Gen_Id); |
| Restore_Env; |
| return; |
| |
| elsif Gen_Unit = Current_Scope then |
| Error_Msg_N |
| ("generic package cannot be used as a formal package of itself", |
| Gen_Id); |
| Restore_Env; |
| return; |
| |
| elsif In_Open_Scopes (Gen_Unit) then |
| if Is_Compilation_Unit (Gen_Unit) |
| and then Is_Child_Unit (Current_Scope) |
| then |
| -- Special-case the error when the formal is a parent, and |
| -- continue analysis to minimize cascaded errors. |
| |
| Error_Msg_N |
| ("generic parent cannot be used as formal package " |
| & "of a child unit", |
| Gen_Id); |
| |
| else |
| Error_Msg_N |
| ("generic package cannot be used as a formal package " |
| & "within itself", |
| Gen_Id); |
| Restore_Env; |
| return; |
| end if; |
| end if; |
| |
| -- Check for a formal package that is a package renaming. |
| |
| if Present (Renamed_Object (Gen_Unit)) then |
| Gen_Unit := Renamed_Object (Gen_Unit); |
| end if; |
| |
| -- The formal package is treated like a regular instance, but only |
| -- the specification needs to be instantiated, to make entities visible. |
| |
| if not Box_Present (N) then |
| Hidden_Entities := New_Elmt_List; |
| Analyze_Package_Instantiation (N); |
| |
| if Parent_Installed then |
| Remove_Parent; |
| end if; |
| |
| else |
| -- If there are no generic associations, the generic parameters |
| -- appear as local entities and are instantiated like them. We copy |
| -- the generic package declaration as if it were an instantiation, |
| -- and analyze it like a regular package, except that we treat the |
| -- formals as additional visible components. |
| |
| Gen_Decl := Unit_Declaration_Node (Gen_Unit); |
| |
| if In_Extended_Main_Source_Unit (N) then |
| Set_Is_Instantiated (Gen_Unit); |
| Generate_Reference (Gen_Unit, N); |
| end if; |
| |
| Formal := New_Copy (Pack_Id); |
| New_N := |
| Copy_Generic_Node |
| (Original_Node (Gen_Decl), Empty, Instantiating => True); |
| Rewrite (N, New_N); |
| Set_Defining_Unit_Name (Specification (New_N), Formal); |
| Set_Instance_Env (Gen_Unit, Formal); |
| |
| Enter_Name (Formal); |
| Set_Ekind (Formal, E_Generic_Package); |
| Set_Etype (Formal, Standard_Void_Type); |
| Set_Inner_Instances (Formal, New_Elmt_List); |
| New_Scope (Formal); |
| |
| -- Within the formal, the name of the generic package is a renaming |
| -- of the formal (as for a regular instantiation). |
| |
| Renaming := Make_Package_Renaming_Declaration (Loc, |
| Defining_Unit_Name => |
| Make_Defining_Identifier (Loc, Chars (Gen_Unit)), |
| Name => New_Reference_To (Formal, Loc)); |
| |
| if Present (Visible_Declarations (Specification (N))) then |
| Prepend (Renaming, To => Visible_Declarations (Specification (N))); |
| elsif Present (Private_Declarations (Specification (N))) then |
| Prepend (Renaming, To => Private_Declarations (Specification (N))); |
| end if; |
| |
| if Is_Child_Unit (Gen_Unit) |
| and then Parent_Installed |
| then |
| -- Similarly, we have to make the name of the formal visible in |
| -- the parent instance, to resolve properly fully qualified names |
| -- that may appear in the generic unit. The parent instance has |
| -- been placed on the scope stack ahead of the current scope. |
| |
| Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity; |
| |
| Renaming_In_Par := |
| Make_Defining_Identifier (Loc, Chars (Gen_Unit)); |
| Set_Ekind (Renaming_In_Par, E_Package); |
| Set_Etype (Renaming_In_Par, Standard_Void_Type); |
| Set_Scope (Renaming_In_Par, Parent_Instance); |
| Set_Parent (Renaming_In_Par, Parent (Formal)); |
| Set_Renamed_Object (Renaming_In_Par, Formal); |
| Append_Entity (Renaming_In_Par, Parent_Instance); |
| end if; |
| |
| Analyze_Generic_Formal_Part (N); |
| Analyze (Specification (N)); |
| End_Package_Scope (Formal); |
| |
| if Parent_Installed then |
| Remove_Parent; |
| end if; |
| |
| Restore_Env; |
| |
| -- Inside the generic unit, the formal package is a regular |
| -- package, but no body is needed for it. Note that after |
| -- instantiation, the defining_unit_name we need is in the |
| -- new tree and not in the original. (see Package_Instantiation). |
| -- A generic formal package is an instance, and can be used as |
| -- an actual for an inner instance. Mark its generic parent. |
| |
| Set_Ekind (Formal, E_Package); |
| Set_Generic_Parent (Specification (N), Gen_Unit); |
| Set_Has_Completion (Formal, True); |
| |
| Set_Ekind (Pack_Id, E_Package); |
| Set_Etype (Pack_Id, Standard_Void_Type); |
| Set_Scope (Pack_Id, Scope (Formal)); |
| Set_Has_Completion (Pack_Id, True); |
| end if; |
| end Analyze_Formal_Package; |
| |
| --------------------------------- |
| -- Analyze_Formal_Private_Type -- |
| --------------------------------- |
| |
| procedure Analyze_Formal_Private_Type |
| (N : Node_Id; |
| T : Entity_Id; |
| Def : Node_Id) |
| is |
| begin |
| New_Private_Type (N, T, Def); |
| |
| -- Set the size to an arbitrary but legal value. |
| |
| Set_Size_Info (T, Standard_Integer); |
| Set_RM_Size (T, RM_Size (Standard_Integer)); |
| end Analyze_Formal_Private_Type; |
| |
| ---------------------------------------- |
| -- Analyze_Formal_Signed_Integer_Type -- |
| ---------------------------------------- |
| |
| procedure Analyze_Formal_Signed_Integer_Type |
| (T : Entity_Id; |
| Def : Node_Id) |
| is |
| Base : constant Entity_Id := |
| New_Internal_Entity |
| (E_Signed_Integer_Type, Current_Scope, Sloc (Def), 'G'); |
| |
| begin |
| Enter_Name (T); |
| |
| Set_Ekind (T, E_Signed_Integer_Subtype); |
| Set_Etype (T, Base); |
| Set_Size_Info (T, Standard_Integer); |
| Set_RM_Size (T, RM_Size (Standard_Integer)); |
| Set_Scalar_Range (T, Scalar_Range (Standard_Integer)); |
| Set_Is_Constrained (T); |
| |
| Set_Is_Generic_Type (Base); |
| Set_Size_Info (Base, Standard_Integer); |
| Set_RM_Size (Base, RM_Size (Standard_Integer)); |
| Set_Etype (Base, Base); |
| Set_Scalar_Range (Base, Scalar_Range (Standard_Integer)); |
| Set_Parent (Base, Parent (Def)); |
| end Analyze_Formal_Signed_Integer_Type; |
| |
| ------------------------------- |
| -- Analyze_Formal_Subprogram -- |
| ------------------------------- |
| |
| procedure Analyze_Formal_Subprogram (N : Node_Id) is |
| Spec : constant Node_Id := Specification (N); |
| Def : constant Node_Id := Default_Name (N); |
| Nam : constant Entity_Id := Defining_Unit_Name (Spec); |
| Subp : Entity_Id; |
| |
| begin |
| if Nam = Error then |
| return; |
| end if; |
| |
| if Nkind (Nam) = N_Defining_Program_Unit_Name then |
| Error_Msg_N ("name of formal subprogram must be a direct name", Nam); |
| return; |
| end if; |
| |
| Analyze_Subprogram_Declaration (N); |
| Set_Is_Formal_Subprogram (Nam); |
| Set_Has_Completion (Nam); |
| |
| if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then |
| Set_Is_Abstract (Nam); |
| Set_Is_Dispatching_Operation (Nam); |
| |
| declare |
| Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam); |
| |
| begin |
| if not Present (Ctrl_Type) then |
| Error_Msg_N |
| ("abstract formal subprogram must have a controlling type", |
| N); |
| |
| else |
| Check_Controlling_Formals (Ctrl_Type, Nam); |
| end if; |
| end; |
| end if; |
| |
| -- Default name is resolved at the point of instantiation |
| |
| if Box_Present (N) then |
| null; |
| |
| -- Else default is bound at the point of generic declaration |
| |
| elsif Present (Def) then |
| if Nkind (Def) = N_Operator_Symbol then |
| Find_Direct_Name (Def); |
| |
| elsif Nkind (Def) /= N_Attribute_Reference then |
| Analyze (Def); |
| |
| else |
| -- For an attribute reference, analyze the prefix and verify |
| -- that it has the proper profile for the subprogram. |
| |
| Analyze (Prefix (Def)); |
| Valid_Default_Attribute (Nam, Def); |
| return; |
| end if; |
| |
| -- Default name may be overloaded, in which case the interpretation |
| -- with the correct profile must be selected, as for a renaming. |
| |
| if Etype (Def) = Any_Type then |
| return; |
| |
| elsif Nkind (Def) = N_Selected_Component then |
| Subp := Entity (Selector_Name (Def)); |
| |
| if Ekind (Subp) /= E_Entry then |
| Error_Msg_N ("expect valid subprogram name as default", Def); |
| return; |
| end if; |
| |
| elsif Nkind (Def) = N_Indexed_Component then |
| |
| if Nkind (Prefix (Def)) /= N_Selected_Component then |
| Error_Msg_N ("expect valid subprogram name as default", Def); |
| return; |
| |
| else |
| Subp := Entity (Selector_Name (Prefix (Def))); |
| |
| if Ekind (Subp) /= E_Entry_Family then |
| Error_Msg_N ("expect valid subprogram name as default", Def); |
| return; |
| end if; |
| end if; |
| |
| elsif Nkind (Def) = N_Character_Literal then |
| |
| -- Needs some type checks: subprogram should be parameterless??? |
| |
| Resolve (Def, (Etype (Nam))); |
| |
| elsif not Is_Entity_Name (Def) |
| or else not Is_Overloadable (Entity (Def)) |
| then |
| Error_Msg_N ("expect valid subprogram name as default", Def); |
| return; |
| |
| elsif not Is_Overloaded (Def) then |
| Subp := Entity (Def); |
| |
| if Subp = Nam then |
| Error_Msg_N ("premature usage of formal subprogram", Def); |
| |
| elsif not Entity_Matches_Spec (Subp, Nam) then |
| Error_Msg_N ("no visible entity matches specification", Def); |
| end if; |
| |
| else |
| declare |
| I : Interp_Index; |
| I1 : Interp_Index := 0; |
| It : Interp; |
| It1 : Interp; |
| |
| begin |
| Subp := Any_Id; |
| Get_First_Interp (Def, I, It); |
| while Present (It.Nam) loop |
| |
| if Entity_Matches_Spec (It.Nam, Nam) then |
| if Subp /= Any_Id then |
| It1 := Disambiguate (Def, I1, I, Etype (Subp)); |
| |
| if It1 = No_Interp then |
| Error_Msg_N ("ambiguous default subprogram", Def); |
| else |
| Subp := It1.Nam; |
| end if; |
| |
| exit; |
| |
| else |
| I1 := I; |
| Subp := It.Nam; |
| end if; |
| end if; |
| |
| Get_Next_Interp (I, It); |
| end loop; |
| end; |
| |
| if Subp /= Any_Id then |
| Set_Entity (Def, Subp); |
| |
| if Subp = Nam then |
| Error_Msg_N ("premature usage of formal subprogram", Def); |
| |
| elsif Ekind (Subp) /= E_Operator then |
| Check_Mode_Conformant (Subp, Nam); |
| end if; |
| |
| else |
| Error_Msg_N ("no visible subprogram matches specification", N); |
| end if; |
| end if; |
| end if; |
| end Analyze_Formal_Subprogram; |
| |
| ------------------------------------- |
| -- Analyze_Formal_Type_Declaration -- |
| ------------------------------------- |
| |
| procedure Analyze_Formal_Type_Declaration (N : Node_Id) is |
| Def : constant Node_Id := Formal_Type_Definition (N); |
| T : Entity_Id; |
| |
| begin |
| T := Defining_Identifier (N); |
| |
| if Present (Discriminant_Specifications (N)) |
| and then Nkind (Def) /= N_Formal_Private_Type_Definition |
| then |
| Error_Msg_N |
| ("discriminants not allowed for this formal type", |
| Defining_Identifier (First (Discriminant_Specifications (N)))); |
| end if; |
| |
| -- Enter the new name, and branch to specific routine. |
| |
| case Nkind (Def) is |
| when N_Formal_Private_Type_Definition => |
| Analyze_Formal_Private_Type (N, T, Def); |
| |
| when N_Formal_Derived_Type_Definition => |
| Analyze_Formal_Derived_Type (N, T, Def); |
| |
| when N_Formal_Discrete_Type_Definition => |
| Analyze_Formal_Discrete_Type (T, Def); |
| |
| when N_Formal_Signed_Integer_Type_Definition => |
| Analyze_Formal_Signed_Integer_Type (T, Def); |
| |
| when N_Formal_Modular_Type_Definition => |
| Analyze_Formal_Modular_Type (T, Def); |
| |
| when N_Formal_Floating_Point_Definition => |
| Analyze_Formal_Floating_Type (T, Def); |
| |
| when N_Formal_Ordinary_Fixed_Point_Definition => |
| Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def); |
| |
| when N_Formal_Decimal_Fixed_Point_Definition => |
| Analyze_Formal_Decimal_Fixed_Point_Type (T, Def); |
| |
| when N_Array_Type_Definition => |
| Analyze_Formal_Array_Type (T, Def); |
| |
| when N_Access_To_Object_Definition | |
| N_Access_Function_Definition | |
| N_Access_Procedure_Definition => |
| Analyze_Generic_Access_Type (T, Def); |
| |
| when N_Error => |
| null; |
| |
| when others => |
| raise Program_Error; |
| |
| end case; |
| |
| Set_Is_Generic_Type (T); |
| end Analyze_Formal_Type_Declaration; |
| |
| ------------------------------------ |
| -- Analyze_Function_Instantiation -- |
| ------------------------------------ |
| |
| procedure Analyze_Function_Instantiation (N : Node_Id) is |
| begin |
| Analyze_Subprogram_Instantiation (N, E_Function); |
| end Analyze_Function_Instantiation; |
| |
| --------------------------------- |
| -- Analyze_Generic_Access_Type -- |
| --------------------------------- |
| |
| procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is |
| begin |
| Enter_Name (T); |
| |
| if Nkind (Def) = N_Access_To_Object_Definition then |
| Access_Type_Declaration (T, Def); |
| |
| if Is_Incomplete_Or_Private_Type (Designated_Type (T)) |
| and then No (Full_View (Designated_Type (T))) |
| and then not Is_Generic_Type (Designated_Type (T)) |
| then |
| Error_Msg_N ("premature usage of incomplete type", Def); |
| |
| elsif Is_Internal (Designated_Type (T)) then |
| Error_Msg_N |
| ("only a subtype mark is allowed in a formal", Def); |
| end if; |
| |
| else |
| Access_Subprogram_Declaration (T, Def); |
| end if; |
| end Analyze_Generic_Access_Type; |
| |
| --------------------------------- |
| -- Analyze_Generic_Formal_Part -- |
| --------------------------------- |
| |
| procedure Analyze_Generic_Formal_Part (N : Node_Id) is |
| Gen_Parm_Decl : Node_Id; |
| |
| begin |
| -- The generic formals are processed in the scope of the generic |
| -- unit, where they are immediately visible. The scope is installed |
| -- by the caller. |
| |
| Gen_Parm_Decl := First (Generic_Formal_Declarations (N)); |
| |
| while Present (Gen_Parm_Decl) loop |
| Analyze (Gen_Parm_Decl); |
| Next (Gen_Parm_Decl); |
| end loop; |
| |
| Generate_Reference_To_Generic_Formals (Current_Scope); |
| end Analyze_Generic_Formal_Part; |
| |
| ------------------------------------------ |
| -- Analyze_Generic_Package_Declaration -- |
| ------------------------------------------ |
| |
| procedure Analyze_Generic_Package_Declaration (N : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Id : Entity_Id; |
| New_N : Node_Id; |
| Save_Parent : Node_Id; |
| Renaming : Node_Id; |
| Decls : constant List_Id := |
| Visible_Declarations (Specification (N)); |
| Decl : Node_Id; |
| |
| begin |
| -- We introduce a renaming of the enclosing package, to have a usable |
| -- entity as the prefix of an expanded name for a local entity of the |
| -- form Par.P.Q, where P is the generic package. This is because a local |
| -- entity named P may hide it, so that the usual visibility rules in |
| -- the instance will not resolve properly. |
| |
| Renaming := |
| Make_Package_Renaming_Declaration (Loc, |
| Defining_Unit_Name => |
| Make_Defining_Identifier (Loc, |
| Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")), |
| Name => Make_Identifier (Loc, Chars (Defining_Entity (N)))); |
| |
| if Present (Decls) then |
| Decl := First (Decls); |
| while Present (Decl) |
| and then Nkind (Decl) = N_Pragma |
| loop |
| Next (Decl); |
| end loop; |
| |
| if Present (Decl) then |
| Insert_Before (Decl, Renaming); |
| else |
| Append (Renaming, Visible_Declarations (Specification (N))); |
| end if; |
| |
| else |
| Set_Visible_Declarations (Specification (N), New_List (Renaming)); |
| end if; |
| |
| -- Create copy of generic unit, and save for instantiation. |
| -- If the unit is a child unit, do not copy the specifications |
| -- for the parent, which are not part of the generic tree. |
| |
| Save_Parent := Parent_Spec (N); |
| Set_Parent_Spec (N, Empty); |
| |
| New_N := Copy_Generic_Node (N, Empty, Instantiating => False); |
| Set_Parent_Spec (New_N, Save_Parent); |
| Rewrite (N, New_N); |
| Id := Defining_Entity (N); |
| Generate_Definition (Id); |
| |
| -- Expansion is not applied to generic units. |
| |
| Start_Generic; |
| |
| Enter_Name (Id); |
| Set_Ekind (Id, E_Generic_Package); |
| Set_Etype (Id, Standard_Void_Type); |
| New_Scope (Id); |
| Enter_Generic_Scope (Id); |
| Set_Inner_Instances (Id, New_Elmt_List); |
| |
| Set_Categorization_From_Pragmas (N); |
| Set_Is_Pure (Id, Is_Pure (Current_Scope)); |
| |
| -- Link the declaration of the generic homonym in the generic copy |
| -- to the package it renames, so that it is always resolved properly. |
| |
| Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming)); |
| Set_Entity (Associated_Node (Name (Renaming)), Id); |
| |
| -- For a library unit, we have reconstructed the entity for the |
| -- unit, and must reset it in the library tables. |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| Set_Cunit_Entity (Current_Sem_Unit, Id); |
| end if; |
| |
| Analyze_Generic_Formal_Part (N); |
| |
| -- After processing the generic formals, analysis proceeds |
| -- as for a non-generic package. |
| |
| Analyze (Specification (N)); |
| |
| Validate_Categorization_Dependency (N, Id); |
| |
| End_Generic; |
| |
| End_Package_Scope (Id); |
| Exit_Generic_Scope (Id); |
| |
| if Nkind (Parent (N)) /= N_Compilation_Unit then |
| Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N))); |
| Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N))); |
| Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N)); |
| |
| else |
| Set_Body_Required (Parent (N), Unit_Requires_Body (Id)); |
| Validate_RT_RAT_Component (N); |
| |
| -- If this is a spec without a body, check that generic parameters |
| -- are referenced. |
| |
| if not Body_Required (Parent (N)) then |
| Check_References (Id); |
| end if; |
| end if; |
| end Analyze_Generic_Package_Declaration; |
| |
| -------------------------------------------- |
| -- Analyze_Generic_Subprogram_Declaration -- |
| -------------------------------------------- |
| |
| procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is |
| Spec : Node_Id; |
| Id : Entity_Id; |
| Formals : List_Id; |
| New_N : Node_Id; |
| Save_Parent : Node_Id; |
| |
| begin |
| -- Create copy of generic unit,and save for instantiation. |
| -- If the unit is a child unit, do not copy the specifications |
| -- for the parent, which are not part of the generic tree. |
| |
| Save_Parent := Parent_Spec (N); |
| Set_Parent_Spec (N, Empty); |
| |
| New_N := Copy_Generic_Node (N, Empty, Instantiating => False); |
| Set_Parent_Spec (New_N, Save_Parent); |
| Rewrite (N, New_N); |
| |
| Spec := Specification (N); |
| Id := Defining_Entity (Spec); |
| Generate_Definition (Id); |
| |
| if Nkind (Id) = N_Defining_Operator_Symbol then |
| Error_Msg_N |
| ("operator symbol not allowed for generic subprogram", Id); |
| end if; |
| |
| Start_Generic; |
| |
| Enter_Name (Id); |
| |
| Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1); |
| New_Scope (Id); |
| Enter_Generic_Scope (Id); |
| Set_Inner_Instances (Id, New_Elmt_List); |
| Set_Is_Pure (Id, Is_Pure (Current_Scope)); |
| |
| Analyze_Generic_Formal_Part (N); |
| |
| Formals := Parameter_Specifications (Spec); |
| |
| if Present (Formals) then |
| Process_Formals (Formals, Spec); |
| end if; |
| |
| if Nkind (Spec) = N_Function_Specification then |
| Set_Ekind (Id, E_Generic_Function); |
| Find_Type (Subtype_Mark (Spec)); |
| Set_Etype (Id, Entity (Subtype_Mark (Spec))); |
| else |
| Set_Ekind (Id, E_Generic_Procedure); |
| Set_Etype (Id, Standard_Void_Type); |
| end if; |
| |
| -- For a library unit, we have reconstructed the entity for the |
| -- unit, and must reset it in the library tables. We also need |
| -- to make sure that Body_Required is set properly in the original |
| -- compilation unit node. |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| Set_Cunit_Entity (Current_Sem_Unit, Id); |
| Set_Body_Required (Parent (N), Unit_Requires_Body (Id)); |
| end if; |
| |
| Set_Categorization_From_Pragmas (N); |
| Validate_Categorization_Dependency (N, Id); |
| |
| Save_Global_References (Original_Node (N)); |
| |
| End_Generic; |
| End_Scope; |
| Exit_Generic_Scope (Id); |
| Generate_Reference_To_Formals (Id); |
| end Analyze_Generic_Subprogram_Declaration; |
| |
| ----------------------------------- |
| -- Analyze_Package_Instantiation -- |
| ----------------------------------- |
| |
| -- Note: this procedure is also used for formal package declarations, |
| -- in which case the argument N is an N_Formal_Package_Declaration |
| -- node. This should really be noted in the spec! ??? |
| |
| procedure Analyze_Package_Instantiation (N : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Gen_Id : constant Node_Id := Name (N); |
| |
| Act_Decl : Node_Id; |
| Act_Decl_Name : Node_Id; |
| Act_Decl_Id : Entity_Id; |
| Act_Spec : Node_Id; |
| Act_Tree : Node_Id; |
| |
| Gen_Decl : Node_Id; |
| Gen_Unit : Entity_Id; |
| |
| Is_Actual_Pack : constant Boolean := |
| Is_Internal (Defining_Entity (N)); |
| |
| Parent_Installed : Boolean := False; |
| Renaming_List : List_Id; |
| Unit_Renaming : Node_Id; |
| Needs_Body : Boolean; |
| Inline_Now : Boolean := False; |
| |
| procedure Delay_Descriptors (E : Entity_Id); |
| -- Delay generation of subprogram descriptors for given entity |
| |
| function Might_Inline_Subp return Boolean; |
| -- If inlining is active and the generic contains inlined subprograms, |
| -- we instantiate the body. This may cause superfluous instantiations, |
| -- but it is simpler than detecting the need for the body at the point |
| -- of inlining, when the context of the instance is not available. |
| |
| ----------------------- |
| -- Delay_Descriptors -- |
| ----------------------- |
| |
| procedure Delay_Descriptors (E : Entity_Id) is |
| begin |
| if not Delay_Subprogram_Descriptors (E) then |
| Set_Delay_Subprogram_Descriptors (E); |
| Pending_Descriptor.Increment_Last; |
| Pending_Descriptor.Table (Pending_Descriptor.Last) := E; |
| end if; |
| end Delay_Descriptors; |
| |
| ----------------------- |
| -- Might_Inline_Subp -- |
| ----------------------- |
| |
| function Might_Inline_Subp return Boolean is |
| E : Entity_Id; |
| |
| begin |
| if not Inline_Processing_Required then |
| return False; |
| |
| else |
| E := First_Entity (Gen_Unit); |
| while Present (E) loop |
| if Is_Subprogram (E) |
| and then Is_Inlined (E) |
| then |
| return True; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| end if; |
| |
| return False; |
| end Might_Inline_Subp; |
| |
| -- Start of processing for Analyze_Package_Instantiation |
| |
| begin |
| -- Very first thing: apply the special kludge for Text_IO processing |
| -- in case we are instantiating one of the children of [Wide_]Text_IO. |
| |
| Text_IO_Kludge (Name (N)); |
| |
| -- Make node global for error reporting. |
| |
| Instantiation_Node := N; |
| |
| -- Case of instantiation of a generic package |
| |
| if Nkind (N) = N_Package_Instantiation then |
| Act_Decl_Id := New_Copy (Defining_Entity (N)); |
| Set_Comes_From_Source (Act_Decl_Id, True); |
| |
| if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then |
| Act_Decl_Name := |
| Make_Defining_Program_Unit_Name (Loc, |
| Name => New_Copy_Tree (Name (Defining_Unit_Name (N))), |
| Defining_Identifier => Act_Decl_Id); |
| else |
| Act_Decl_Name := Act_Decl_Id; |
| end if; |
| |
| -- Case of instantiation of a formal package |
| |
| else |
| Act_Decl_Id := Defining_Identifier (N); |
| Act_Decl_Name := Act_Decl_Id; |
| end if; |
| |
| Generate_Definition (Act_Decl_Id); |
| Pre_Analyze_Actuals (N); |
| |
| Init_Env; |
| Check_Generic_Child_Unit (Gen_Id, Parent_Installed); |
| Gen_Unit := Entity (Gen_Id); |
| |
| -- Verify that it is the name of a generic package |
| |
| if Etype (Gen_Unit) = Any_Type then |
| Restore_Env; |
| return; |
| |
| elsif Ekind (Gen_Unit) /= E_Generic_Package then |
| |
| -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause |
| |
| if From_With_Type (Gen_Unit) then |
| Error_Msg_N |
| ("cannot instantiate a limited withed package", Gen_Id); |
| else |
| Error_Msg_N |
| ("expect name of generic package in instantiation", Gen_Id); |
| end if; |
| |
| Restore_Env; |
| return; |
| end if; |
| |
| if In_Extended_Main_Source_Unit (N) then |
| Set_Is_Instantiated (Gen_Unit); |
| Generate_Reference (Gen_Unit, N); |
| |
| if Present (Renamed_Object (Gen_Unit)) then |
| Set_Is_Instantiated (Renamed_Object (Gen_Unit)); |
| Generate_Reference (Renamed_Object (Gen_Unit), N); |
| end if; |
| end if; |
| |
| if Nkind (Gen_Id) = N_Identifier |
| and then Chars (Gen_Unit) = Chars (Defining_Entity (N)) |
| then |
| Error_Msg_NE |
| ("& is hidden within declaration of instance", Gen_Id, Gen_Unit); |
| |
| elsif Nkind (Gen_Id) = N_Expanded_Name |
| and then Is_Child_Unit (Gen_Unit) |
| and then Nkind (Prefix (Gen_Id)) = N_Identifier |
| and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id)) |
| then |
| Error_Msg_N |
| ("& is hidden within declaration of instance ", Prefix (Gen_Id)); |
| end if; |
| |
| Set_Entity (Gen_Id, Gen_Unit); |
| |
| -- If generic is a renaming, get original generic unit. |
| |
| if Present (Renamed_Object (Gen_Unit)) |
| and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package |
| then |
| Gen_Unit := Renamed_Object (Gen_Unit); |
| end if; |
| |
| -- Verify that there are no circular instantiations. |
| |
| if In_Open_Scopes (Gen_Unit) then |
| Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit); |
| Restore_Env; |
| return; |
| |
| elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then |
| Error_Msg_Node_2 := Current_Scope; |
| Error_Msg_NE |
| ("circular Instantiation: & instantiated in &!", N, Gen_Unit); |
| Circularity_Detected := True; |
| Restore_Env; |
| return; |
| |
| else |
| Set_Instance_Env (Gen_Unit, Act_Decl_Id); |
| Gen_Decl := Unit_Declaration_Node (Gen_Unit); |
| |
| -- Initialize renamings map, for error checking, and the list |
| -- that holds private entities whose views have changed between |
| -- generic definition and instantiation. If this is the instance |
| -- created to validate an actual package, the instantiation |
| -- environment is that of the enclosing instance. |
| |
| Generic_Renamings.Set_Last (0); |
| Generic_Renamings_HTable.Reset; |
| |
| Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); |
| |
| -- Copy original generic tree, to produce text for instantiation. |
| |
| Act_Tree := |
| Copy_Generic_Node |
| (Original_Node (Gen_Decl), Empty, Instantiating => True); |
| |
| Act_Spec := Specification (Act_Tree); |
| |
| -- If this is the instance created to validate an actual package, |
| -- only the formals matter, do not examine the package spec itself. |
| |
| if Is_Actual_Pack then |
| Set_Visible_Declarations (Act_Spec, New_List); |
| Set_Private_Declarations (Act_Spec, New_List); |
| end if; |
| |
| Renaming_List := |
| Analyze_Associations |
| (N, |
| Generic_Formal_Declarations (Act_Tree), |
| Generic_Formal_Declarations (Gen_Decl)); |
| |
| Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name); |
| Set_Is_Generic_Instance (Act_Decl_Id); |
| |
| Set_Generic_Parent (Act_Spec, Gen_Unit); |
| |
| -- References to the generic in its own declaration or its body |
| -- are references to the instance. Add a renaming declaration for |
| -- the generic unit itself. This declaration, as well as the renaming |
| -- declarations for the generic formals, must remain private to the |
| -- unit: the formals, because this is the language semantics, and |
| -- the unit because its use is an artifact of the implementation. |
| |
| Unit_Renaming := |
| Make_Package_Renaming_Declaration (Loc, |
| Defining_Unit_Name => |
| Make_Defining_Identifier (Loc, Chars (Gen_Unit)), |
| Name => New_Reference_To (Act_Decl_Id, Loc)); |
| |
| Append (Unit_Renaming, Renaming_List); |
| |
| -- The renaming declarations are the first local declarations of |
| -- the new unit. |
| |
| if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then |
| Insert_List_Before |
| (First (Visible_Declarations (Act_Spec)), Renaming_List); |
| else |
| Set_Visible_Declarations (Act_Spec, Renaming_List); |
| end if; |
| |
| Act_Decl := |
| Make_Package_Declaration (Loc, |
| Specification => Act_Spec); |
| |
| -- Save the instantiation node, for subsequent instantiation |
| -- of the body, if there is one and we are generating code for |
| -- the current unit. Mark the unit as having a body, to avoid |
| -- a premature error message. |
| |
| -- We instantiate the body if we are generating code, if we are |
| -- generating cross-reference information, or if we are building |
| -- trees for ASIS use. |
| |
| declare |
| Enclosing_Body_Present : Boolean := False; |
| -- If the generic unit is not a compilation unit, then a body |
| -- may be present in its parent even if none is required. We |
| -- create a tentative pending instantiation for the body, which |
| -- will be discarded if none is actually present. |
| |
| Scop : Entity_Id; |
| |
| begin |
| if Scope (Gen_Unit) /= Standard_Standard |
| and then not Is_Child_Unit (Gen_Unit) |
| then |
| Scop := Scope (Gen_Unit); |
| |
| while Present (Scop) |
| and then Scop /= Standard_Standard |
| loop |
| if Unit_Requires_Body (Scop) then |
| Enclosing_Body_Present := True; |
| exit; |
| |
| elsif In_Open_Scopes (Scop) |
| and then In_Package_Body (Scop) |
| then |
| Enclosing_Body_Present := True; |
| exit; |
| end if; |
| |
| exit when Is_Compilation_Unit (Scop); |
| Scop := Scope (Scop); |
| end loop; |
| end if; |
| |
| -- If front-end inlining is enabled, and this is a unit for which |
| -- code will be generated, we instantiate the body at once. |
| -- This is done if the instance is not the main unit, and if the |
| -- generic is not a child unit of another generic, to avoid scope |
| -- problems and the reinstallation of parent instances. |
| |
| if Front_End_Inlining |
| and then Expander_Active |
| and then (not Is_Child_Unit (Gen_Unit) |
| or else not Is_Generic_Unit (Scope (Gen_Unit))) |
| and then (Is_In_Main_Unit (N) |
| or else In_Main_Context (Current_Scope)) |
| and then Nkind (Parent (N)) /= N_Compilation_Unit |
| and then Might_Inline_Subp |
| and then not Is_Actual_Pack |
| then |
| Inline_Now := True; |
| end if; |
| |
| Needs_Body := |
| (Unit_Requires_Body (Gen_Unit) |
| or else Enclosing_Body_Present |
| or else Present (Corresponding_Body (Gen_Decl))) |
| and then (Is_In_Main_Unit (N) |
| or else Might_Inline_Subp) |
| and then not Is_Actual_Pack |
| and then not Inline_Now |
| |
| and then (Operating_Mode = Generate_Code |
| or else (Operating_Mode = Check_Semantics |
| and then ASIS_Mode)); |
| |
| -- If front_end_inlining is enabled, do not instantiate a |
| -- body if within a generic context. |
| |
| if (Front_End_Inlining |
| and then not Expander_Active) |
| or else Is_Generic_Unit (Cunit_Entity (Main_Unit)) |
| then |
| Needs_Body := False; |
| end if; |
| |
| -- If the current context is generic, and the package being |
| -- instantiated is declared within a formal package, there |
| -- is no body to instantiate until the enclosing generic is |
| -- instantiated, and there is an actual for the formal |
| -- package. If the formal package has parameters, we build a |
| -- regular package instance for it, that preceeds the original |
| -- formal package declaration. |
| |
| if In_Open_Scopes (Scope (Scope (Gen_Unit))) then |
| declare |
| Decl : constant Node_Id := |
| Original_Node |
| (Unit_Declaration_Node (Scope (Gen_Unit))); |
| begin |
| if Nkind (Decl) = N_Formal_Package_Declaration |
| or else (Nkind (Decl) = N_Package_Declaration |
| and then Is_List_Member (Decl) |
| and then Present (Next (Decl)) |
| and then |
| Nkind (Next (Decl)) = N_Formal_Package_Declaration) |
| then |
| Needs_Body := False; |
| end if; |
| end; |
| end if; |
| end; |
| |
| -- If we are generating the calling stubs from the instantiation |
| -- of a generic RCI package, we will not use the body of the |
| -- generic package. |
| |
| if Distribution_Stub_Mode = Generate_Caller_Stub_Body |
| and then Is_Compilation_Unit (Defining_Entity (N)) |
| then |
| Needs_Body := False; |
| end if; |
| |
| if Needs_Body then |
| |
| -- Here is a defence against a ludicrous number of instantiations |
| -- caused by a circular set of instantiation attempts. |
| |
| if Pending_Instantiations.Last > |
| Hostparm.Max_Instantiations |
| then |
| Error_Msg_N ("too many instantiations", N); |
| raise Unrecoverable_Error; |
| end if; |
| |
| -- Indicate that the enclosing scopes contain an instantiation, |
| -- and that cleanup actions should be delayed until after the |
| -- instance body is expanded. |
| |
| Check_Forward_Instantiation (Gen_Decl); |
| if Nkind (N) = N_Package_Instantiation then |
| declare |
| Enclosing_Master : Entity_Id := Current_Scope; |
| |
| begin |
| while Enclosing_Master /= Standard_Standard loop |
| |
| if Ekind (Enclosing_Master) = E_Package then |
| if Is_Compilation_Unit (Enclosing_Master) then |
| if In_Package_Body (Enclosing_Master) then |
| Delay_Descriptors |
| (Body_Entity (Enclosing_Master)); |
| else |
| Delay_Descriptors |
| (Enclosing_Master); |
| end if; |
| |
| exit; |
| |
| else |
| Enclosing_Master := Scope (Enclosing_Master); |
| end if; |
| |
| elsif Ekind (Enclosing_Master) = E_Generic_Package then |
| Enclosing_Master := Scope (Enclosing_Master); |
| |
| elsif Is_Generic_Subprogram (Enclosing_Master) |
| or else Ekind (Enclosing_Master) = E_Void |
| then |
| -- Cleanup actions will eventually be performed on |
| -- the enclosing instance, if any. enclosing scope |
| -- is void in the formal part of a generic subp. |
| |
| exit; |
| |
| else |
| if Ekind (Enclosing_Master) = E_Entry |
| and then |
| Ekind (Scope (Enclosing_Master)) = E_Protected_Type |
| then |
| Enclosing_Master := |
| Protected_Body_Subprogram (Enclosing_Master); |
| end if; |
| |
| Set_Delay_Cleanups (Enclosing_Master); |
| |
| while Ekind (Enclosing_Master) = E_Block loop |
| Enclosing_Master := Scope (Enclosing_Master); |
| end loop; |
| |
| if Is_Subprogram (Enclosing_Master) then |
| Delay_Descriptors (Enclosing_Master); |
| |
| elsif Is_Task_Type (Enclosing_Master) then |
| declare |
| TBP : constant Node_Id := |
| Get_Task_Body_Procedure |
| (Enclosing_Master); |
| |
| begin |
| if Present (TBP) then |
| Delay_Descriptors (TBP); |
| Set_Delay_Cleanups (TBP); |
| end if; |
| end; |
| end if; |
| |
| exit; |
| end if; |
| end loop; |
| end; |
| |
| -- Make entry in table |
| |
| Pending_Instantiations.Increment_Last; |
| Pending_Instantiations.Table (Pending_Instantiations.Last) := |
| (N, Act_Decl, Expander_Active, Current_Sem_Unit); |
| end if; |
| end if; |
| |
| Set_Categorization_From_Pragmas (Act_Decl); |
| |
| if Parent_Installed then |
| Hide_Current_Scope; |
| end if; |
| |
| Set_Instance_Spec (N, Act_Decl); |
| |
| -- If not a compilation unit, insert the package declaration |
| -- before the original instantiation node. |
| |
| if Nkind (Parent (N)) /= N_Compilation_Unit then |
| Mark_Rewrite_Insertion (Act_Decl); |
| Insert_Before (N, Act_Decl); |
| Analyze (Act_Decl); |
| |
| -- For an instantiation that is a compilation unit, place |
| -- declaration on current node so context is complete |
| -- for analysis (including nested instantiations). It this |
| -- is the main unit, the declaration eventually replaces the |
| -- instantiation node. If the instance body is later created, it |
| -- replaces the instance node, and the declation is attached to |
| -- it (see Build_Instance_Compilation_Unit_Nodes). |
| |
| else |
| if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then |
| |
| -- The entity for the current unit is the newly created one, |
| -- and all semantic information is attached to it. |
| |
| Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id); |
| |
| -- If this is the main unit, replace the main entity as well. |
| |
| if Current_Sem_Unit = Main_Unit then |
| Main_Unit_Entity := Act_Decl_Id; |
| end if; |
| end if; |
| |
| Set_Unit (Parent (N), Act_Decl); |
| Set_Parent_Spec (Act_Decl, Parent_Spec (N)); |
| Analyze (Act_Decl); |
| Set_Unit (Parent (N), N); |
| Set_Body_Required (Parent (N), False); |
| |
| -- We never need elaboration checks on instantiations, since |
| -- by definition, the body instantiation is elaborated at the |
| -- same time as the spec instantiation. |
| |
| Set_Suppress_Elaboration_Warnings (Act_Decl_Id); |
| Set_Kill_Elaboration_Checks (Act_Decl_Id); |
| end if; |
| |
| Check_Elab_Instantiation (N); |
| |
| if ABE_Is_Certain (N) and then Needs_Body then |
| Pending_Instantiations.Decrement_Last; |
| end if; |
| Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id); |
| |
| Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming), |
| First_Private_Entity (Act_Decl_Id)); |
| |
| -- If the instantiation will receive a body, the unit will |
| -- be transformed into a package body, and receive its own |
| -- elaboration entity. Otherwise, the nature of the unit is |
| -- now a package declaration. |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit |
| and then not Needs_Body |
| then |
| Rewrite (N, Act_Decl); |
| end if; |
| |
| if Present (Corresponding_Body (Gen_Decl)) |
| or else Unit_Requires_Body (Gen_Unit) |
| then |
| Set_Has_Completion (Act_Decl_Id); |
| end if; |
| |
| Check_Formal_Packages (Act_Decl_Id); |
| |
| Restore_Private_Views (Act_Decl_Id); |
| |
| if not Generic_Separately_Compiled (Gen_Unit) then |
| Inherit_Context (Gen_Decl, N); |
| end if; |
| |
| if Parent_Installed then |
| Remove_Parent; |
| end if; |
| |
| Restore_Env; |
| end if; |
| |
| Validate_Categorization_Dependency (N, Act_Decl_Id); |
| |
| -- Check restriction, but skip this if something went wrong in |
| -- the above analysis, indicated by Act_Decl_Id being void. |
| |
| if Ekind (Act_Decl_Id) /= E_Void |
| and then not Is_Library_Level_Entity (Act_Decl_Id) |
| then |
| Check_Restriction (No_Local_Allocators, N); |
| end if; |
| |
| if Inline_Now then |
| Inline_Instance_Body (N, Gen_Unit, Act_Decl); |
| end if; |
| |
| -- The following is a tree patch for ASIS: ASIS needs separate nodes |
| -- to be used as defining identifiers for a formal package and for the |
| -- corresponding expanded package |
| |
| if Nkind (N) = N_Formal_Package_Declaration then |
| Act_Decl_Id := New_Copy (Defining_Entity (N)); |
| Set_Comes_From_Source (Act_Decl_Id, True); |
| Set_Is_Generic_Instance (Act_Decl_Id, False); |
| Set_Defining_Identifier (N, Act_Decl_Id); |
| end if; |
| |
| exception |
| when Instantiation_Error => |
| if Parent_Installed then |
| Remove_Parent; |
| end if; |
| end Analyze_Package_Instantiation; |
| |
| -------------------------- |
| -- Inline_Instance_Body -- |
| -------------------------- |
| |
| procedure Inline_Instance_Body |
| (N : Node_Id; |
| Gen_Unit : Entity_Id; |
| Act_Decl : Node_Id) |
| is |
| Vis : Boolean; |
| Gen_Comp : constant Entity_Id := |
| Cunit_Entity (Get_Source_Unit (Gen_Unit)); |
| Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit); |
| Curr_Scope : Entity_Id := Empty; |
| Curr_Unit : constant Entity_Id := |
| Cunit_Entity (Current_Sem_Unit); |
| Removed : Boolean := False; |
| Num_Scopes : Int := 0; |
| Use_Clauses : array (1 .. Scope_Stack.Last) of Node_Id; |
| Instances : array (1 .. Scope_Stack.Last) of Entity_Id; |
| Inner_Scopes : array (1 .. Scope_Stack.Last) of Entity_Id; |
| Num_Inner : Int := 0; |
| N_Instances : Int := 0; |
| S : Entity_Id; |
| |
| begin |
| -- Case of generic unit defined in another unit. We must remove |
| -- the complete context of the current unit to install that of |
| -- the generic. |
| |
| if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then |
| S := Current_Scope; |
| |
| while Present (S) |
| and then S /= Standard_Standard |
| loop |
| Num_Scopes := Num_Scopes + 1; |
| |
| Use_Clauses (Num_Scopes) := |
| (Scope_Stack.Table |
| (Scope_Stack.Last - Num_Scopes + 1). |
| First_Use_Clause); |
| End_Use_Clauses (Use_Clauses (Num_Scopes)); |
| |
| exit when Is_Generic_Instance (S) |
| and then (In_Package_Body (S) |
| or else Ekind (S) = E_Procedure |
| or else Ekind (S) = E_Function); |
| S := Scope (S); |
| end loop; |
| |
| Vis := Is_Immediately_Visible (Gen_Comp); |
| |
| -- Find and save all enclosing instances |
| |
| S := Current_Scope; |
| |
| while Present (S) |
| and then S /= Standard_Standard |
| loop |
| if Is_Generic_Instance (S) then |
| N_Instances := N_Instances + 1; |
| Instances (N_Instances) := S; |
| |
| exit when In_Package_Body (S); |
| end if; |
| |
| S := Scope (S); |
| end loop; |
| |
| -- Remove context of current compilation unit, unless we |
| -- are within a nested package instantiation, in which case |
| -- the context has been removed previously. |
| |
| -- If current scope is the body of a child unit, remove context |
| -- of spec as well. |
| |
| S := Current_Scope; |
| |
| while Present (S) |
| and then S /= Standard_Standard |
| loop |
| exit when Is_Generic_Instance (S) |
| and then (In_Package_Body (S) |
| or else Ekind (S) = E_Procedure |
| or else Ekind (S) = E_Function); |
| |
| if S = Curr_Unit |
| or else (Ekind (Curr_Unit) = E_Package_Body |
| and then S = Spec_Entity (Curr_Unit)) |
| or else (Ekind (Curr_Unit) = E_Subprogram_Body |
| and then S = |
| Corresponding_Spec |
| (Unit_Declaration_Node (Curr_Unit))) |
| then |
| Removed := True; |
| |
| -- Remove entities in current scopes from visibility, so |
| -- than instance body is compiled in a clean environment. |
| |
| Save_Scope_Stack (Handle_Use => False); |
| |
| if Is_Child_Unit (S) then |
| |
| -- Remove child unit from stack, as well as inner scopes. |
| -- Removing the context of a child unit removes parent |
| -- units as well. |
| |
| while Current_Scope /= S loop |
| Num_Inner := Num_Inner + 1; |
| Inner_Scopes (Num_Inner) := Current_Scope; |
| Pop_Scope; |
| end loop; |
| |
| Pop_Scope; |
| Remove_Context (Curr_Comp); |
| Curr_Scope := S; |
| |
| else |
| Remove_Context (Curr_Comp); |
| end if; |
| |
| if Ekind (Curr_Unit) = E_Package_Body then |
| Remove_Context (Library_Unit (Curr_Comp)); |
| end if; |
| end if; |
| |
| S := Scope (S); |
| end loop; |
| |
| New_Scope (Standard_Standard); |
| Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True; |
| Instantiate_Package_Body |
| ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True); |
| Pop_Scope; |
| |
| -- Restore context |
| |
| Set_Is_Immediately_Visible (Gen_Comp, Vis); |
| |
| -- Reset Generic_Instance flag so that use clauses can be installed |
| -- in the proper order. (See Use_One_Package for effect of enclosing |
| -- instances on processing of use clauses). |
| |
| for J in 1 .. N_Instances loop |
| Set_Is_Generic_Instance (Instances (J), False); |
| end loop; |
| |
| if Removed then |
| Install_Context (Curr_Comp); |
| |
| if Present (Curr_Scope) |
| and then Is_Child_Unit (Curr_Scope) |
| then |
| New_Scope (Curr_Scope); |
| Set_Is_Immediately_Visible (Curr_Scope); |
| |
| -- Finally, restore inner scopes as well. |
| |
| for J in reverse 1 .. Num_Inner loop |
| New_Scope (Inner_Scopes (J)); |
| end loop; |
| end if; |
| |
| Restore_Scope_Stack (Handle_Use => False); |
| end if; |
| |
| -- Restore use clauses. For a child unit, use clauses in the |
| -- parents are restored when installing the context, so only |
| -- those in inner scopes (and those local to the child unit itself) |
| -- need to be installed explicitly. |
| |
| if Is_Child_Unit (Curr_Unit) |
| and then Removed |
| then |
| for J in reverse 1 .. Num_Inner + 1 loop |
| Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := |
| Use_Clauses (J); |
| Install_Use_Clauses (Use_Clauses (J)); |
| end loop; |
| |
| else |
| for J in reverse 1 .. Num_Scopes loop |
| Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := |
| Use_Clauses (J); |
| Install_Use_Clauses (Use_Clauses (J)); |
| end loop; |
| end if; |
| |
| for J in 1 .. N_Instances loop |
| Set_Is_Generic_Instance (Instances (J), True); |
| end loop; |
| |
| -- If generic unit is in current unit, current context is correct. |
| |
| else |
| Instantiate_Package_Body |
| ((N, Act_Decl, Expander_Active, Current_Sem_Unit), True); |
| end if; |
| end Inline_Instance_Body; |
| |
| ------------------------------------- |
| -- Analyze_Procedure_Instantiation -- |
| ------------------------------------- |
| |
| procedure Analyze_Procedure_Instantiation (N : Node_Id) is |
| begin |
| Analyze_Subprogram_Instantiation (N, E_Procedure); |
| end Analyze_Procedure_Instantiation; |
| |
| -------------------------------------- |
| -- Analyze_Subprogram_Instantiation -- |
| -------------------------------------- |
| |
| procedure Analyze_Subprogram_Instantiation |
| (N : Node_Id; |
| K : Entity_Kind) |
| is |
| Loc : constant Source_Ptr := Sloc (N); |
| Gen_Id : constant Node_Id := Name (N); |
| |
| Anon_Id : constant Entity_Id := |
| Make_Defining_Identifier (Sloc (Defining_Entity (N)), |
| Chars => New_External_Name |
| (Chars (Defining_Entity (N)), 'R')); |
| |
| Act_Decl_Id : Entity_Id; |
| Act_Decl : Node_Id; |
| Act_Spec : Node_Id; |
| Act_Tree : Node_Id; |
| |
| Gen_Unit : Entity_Id; |
| Gen_Decl : Node_Id; |
| Pack_Id : Entity_Id; |
| Parent_Installed : Boolean := False; |
| Renaming_List : List_Id; |
| |
| procedure Analyze_Instance_And_Renamings; |
| -- The instance must be analyzed in a context that includes the |
| -- mappings of generic parameters into actuals. We create a package |
| -- declaration for this purpose, and a subprogram with an internal |
| -- name within the package. The subprogram instance is simply an |
| -- alias for the internal subprogram, declared in the current scope. |
| |
| ------------------------------------ |
| -- Analyze_Instance_And_Renamings -- |
| ------------------------------------ |
| |
| procedure Analyze_Instance_And_Renamings is |
| Def_Ent : constant Entity_Id := Defining_Entity (N); |
| Pack_Decl : Node_Id; |
| |
| begin |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| |
| -- For the case of a compilation unit, the container package |
| -- has the same name as the instantiation, to insure that the |
| -- binder calls the elaboration procedure with the right name. |
| -- Copy the entity of the instance, which may have compilation |
| -- level flags (e.g. Is_Child_Unit) set. |
| |
| Pack_Id := New_Copy (Def_Ent); |
| |
| else |
| -- Otherwise we use the name of the instantiation concatenated |
| -- with its source position to ensure uniqueness if there are |
| -- several instantiations with the same name. |
| |
| Pack_Id := |
| Make_Defining_Identifier (Loc, |
| Chars => New_External_Name |
| (Related_Id => Chars (Def_Ent), |
| Suffix => "GP", |
| Suffix_Index => Source_Offset (Sloc (Def_Ent)))); |
| end if; |
| |
| Pack_Decl := Make_Package_Declaration (Loc, |
| Specification => Make_Package_Specification (Loc, |
| Defining_Unit_Name => Pack_Id, |
| Visible_Declarations => Renaming_List, |
| End_Label => Empty)); |
| |
| Set_Instance_Spec (N, Pack_Decl); |
| Set_Is_Generic_Instance (Pack_Id); |
| Set_Needs_Debug_Info (Pack_Id); |
| |
| -- Case of not a compilation unit |
| |
| if Nkind (Parent (N)) /= N_Compilation_Unit then |
| Mark_Rewrite_Insertion (Pack_Decl); |
| Insert_Before (N, Pack_Decl); |
| Set_Has_Completion (Pack_Id); |
| |
| -- Case of an instantiation that is a compilation unit |
| |
| -- Place declaration on current node so context is complete |
| -- for analysis (including nested instantiations), and for |
| -- use in a context_clause (see Analyze_With_Clause). |
| |
| else |
| Set_Unit (Parent (N), Pack_Decl); |
| Set_Parent_Spec (Pack_Decl, Parent_Spec (N)); |
| end if; |
| |
| Analyze (Pack_Decl); |
| Check_Formal_Packages (Pack_Id); |
| Set_Is_Generic_Instance (Pack_Id, False); |
| |
| -- Body of the enclosing package is supplied when instantiating |
| -- the subprogram body, after semantic analysis is completed. |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| |
| -- Remove package itself from visibility, so it does not |
| -- conflict with subprogram. |
| |
| Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id)); |
| |
| -- Set name and scope of internal subprogram so that the |
| -- proper external name will be generated. The proper scope |
| -- is the scope of the wrapper package. We need to generate |
| -- debugging information for the internal subprogram, so set |
| -- flag accordingly. |
| |
| Set_Chars (Anon_Id, Chars (Defining_Entity (N))); |
| Set_Scope (Anon_Id, Scope (Pack_Id)); |
| |
| -- Mark wrapper package as referenced, to avoid spurious |
| -- warnings if the instantiation appears in various with_ |
| -- clauses of subunits of the main unit. |
| |
| Set_Referenced (Pack_Id); |
| end if; |
| |
| Set_Is_Generic_Instance (Anon_Id); |
| Set_Needs_Debug_Info (Anon_Id); |
| Act_Decl_Id := New_Copy (Anon_Id); |
| |
| Set_Parent (Act_Decl_Id, Parent (Anon_Id)); |
| Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N))); |
| Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N))); |
| Set_Comes_From_Source (Act_Decl_Id, True); |
| |
| -- The signature may involve types that are not frozen yet, but |
| -- the subprogram will be frozen at the point the wrapper package |
| -- is frozen, so it does not need its own freeze node. In fact, if |
| -- one is created, it might conflict with the freezing actions from |
| -- the wrapper package (see 7206-013). |
| |
| Set_Has_Delayed_Freeze (Anon_Id, False); |
| |
| -- If the instance is a child unit, mark the Id accordingly. Mark |
| -- the anonymous entity as well, which is the real subprogram and |
| -- which is used when the instance appears in a context clause. |
| |
| Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N))); |
| Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N))); |
| New_Overloaded_Entity (Act_Decl_Id); |
| Check_Eliminated (Act_Decl_Id); |
| |
| -- In compilation unit case, kill elaboration checks on the |
| -- instantiation, since they are never needed -- the body is |
| -- instantiated at the same point as the spec. |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| Set_Suppress_Elaboration_Warnings (Act_Decl_Id); |
| Set_Kill_Elaboration_Checks (Act_Decl_Id); |
| Set_Is_Compilation_Unit (Anon_Id); |
| |
| Set_Cunit_Entity (Current_Sem_Unit, Pack_Id); |
| end if; |
| |
| -- The instance is not a freezing point for the new subprogram. |
| |
| Set_Is_Frozen (Act_Decl_Id, False); |
| |
| if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then |
| Valid_Operator_Definition (Act_Decl_Id); |
| end if; |
| |
| Set_Alias (Act_Decl_Id, Anon_Id); |
| Set_Parent (Act_Decl_Id, Parent (Anon_Id)); |
| Set_Has_Completion (Act_Decl_Id); |
| Set_Related_Instance (Pack_Id, Act_Decl_Id); |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| Set_Body_Required (Parent (N), False); |
| end if; |
| |
| end Analyze_Instance_And_Renamings; |
| |
| -- Start of processing for Analyze_Subprogram_Instantiation |
| |
| begin |
| -- Very first thing: apply the special kludge for Text_IO processing |
| -- in case we are instantiating one of the children of [Wide_]Text_IO. |
| -- Of course such an instantiation is bogus (these are packages, not |
| -- subprograms), but we get a better error message if we do this. |
| |
| Text_IO_Kludge (Gen_Id); |
| |
| -- Make node global for error reporting. |
| |
| Instantiation_Node := N; |
| Pre_Analyze_Actuals (N); |
| |
| Init_Env; |
| Check_Generic_Child_Unit (Gen_Id, Parent_Installed); |
| Gen_Unit := Entity (Gen_Id); |
| |
| Generate_Reference (Gen_Unit, Gen_Id); |
| |
| if Nkind (Gen_Id) = N_Identifier |
| and then Chars (Gen_Unit) = Chars (Defining_Entity (N)) |
| then |
| Error_Msg_NE |
| ("& is hidden within declaration of instance", Gen_Id, Gen_Unit); |
| end if; |
| |
| if Etype (Gen_Unit) = Any_Type then |
| Restore_Env; |
| return; |
| end if; |
| |
| -- Verify that it is a generic subprogram of the right kind, and that |
| -- it does not lead to a circular instantiation. |
| |
| if Ekind (Gen_Unit) /= E_Generic_Procedure |
| and then Ekind (Gen_Unit) /= E_Generic_Function |
| then |
| Error_Msg_N ("expect generic subprogram in instantiation", Gen_Id); |
| |
| elsif In_Open_Scopes (Gen_Unit) then |
| Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit); |
| |
| elsif K = E_Procedure |
| and then Ekind (Gen_Unit) /= E_Generic_Procedure |
| then |
| if Ekind (Gen_Unit) = E_Generic_Function then |
| Error_Msg_N |
| ("cannot instantiate generic function as procedure", Gen_Id); |
| else |
| Error_Msg_N |
| ("expect name of generic procedure in instantiation", Gen_Id); |
| end if; |
| |
| elsif K = E_Function |
| and then Ekind (Gen_Unit) /= E_Generic_Function |
| then |
| if Ekind (Gen_Unit) = E_Generic_Procedure then |
| Error_Msg_N |
| ("cannot instantiate generic procedure as function", Gen_Id); |
| else |
| Error_Msg_N |
| ("expect name of generic function in instantiation", Gen_Id); |
| end if; |
| |
| else |
| Set_Entity (Gen_Id, Gen_Unit); |
| Set_Is_Instantiated (Gen_Unit); |
| |
| if In_Extended_Main_Source_Unit (N) then |
| Generate_Reference (Gen_Unit, N); |
| end if; |
| |
| -- If renaming, get original unit |
| |
| if Present (Renamed_Object (Gen_Unit)) |
| and then (Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Procedure |
| or else |
| Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Function) |
| then |
| Gen_Unit := Renamed_Object (Gen_Unit); |
| Set_Is_Instantiated (Gen_Unit); |
| Generate_Reference (Gen_Unit, N); |
| end if; |
| |
| if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then |
| Error_Msg_Node_2 := Current_Scope; |
| Error_Msg_NE |
| ("circular Instantiation: & instantiated in &!", N, Gen_Unit); |
| Circularity_Detected := True; |
| return; |
| end if; |
| |
| Gen_Decl := Unit_Declaration_Node (Gen_Unit); |
| |
| -- The subprogram itself cannot contain a nested instance, so |
| -- the current parent is left empty. |
| |
| Set_Instance_Env (Gen_Unit, Empty); |
| |
| -- Initialize renamings map, for error checking. |
| |
| Generic_Renamings.Set_Last (0); |
| Generic_Renamings_HTable.Reset; |
| |
| Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); |
| |
| -- Copy original generic tree, to produce text for instantiation. |
| |
| Act_Tree := |
| Copy_Generic_Node |
| (Original_Node (Gen_Decl), Empty, Instantiating => True); |
| |
| Act_Spec := Specification (Act_Tree); |
| Renaming_List := |
| Analyze_Associations |
| (N, |
| Generic_Formal_Declarations (Act_Tree), |
| Generic_Formal_Declarations (Gen_Decl)); |
| |
| -- Build the subprogram declaration, which does not appear |
| -- in the generic template, and give it a sloc consistent |
| -- with that of the template. |
| |
| Set_Defining_Unit_Name (Act_Spec, Anon_Id); |
| Set_Generic_Parent (Act_Spec, Gen_Unit); |
| Act_Decl := |
| Make_Subprogram_Declaration (Sloc (Act_Spec), |
| Specification => Act_Spec); |
| |
| Set_Categorization_From_Pragmas (Act_Decl); |
| |
| if Parent_Installed then |
| Hide_Current_Scope; |
| end if; |
| |
| Append (Act_Decl, Renaming_List); |
| Analyze_Instance_And_Renamings; |
| |
| -- If the generic is marked Import (Intrinsic), then so is the |
| -- instance. This indicates that there is no body to instantiate. |
| -- If generic is marked inline, so it the instance, and the |
| -- anonymous subprogram it renames. If inlined, or else if inlining |
| -- is enabled for the compilation, we generate the instance body |
| -- even if it is not within the main unit. |
| |
| -- Any other pragmas might also be inherited ??? |
| |
| if Is_Intrinsic_Subprogram (Gen_Unit) then |
| Set_Is_Intrinsic_Subprogram (Anon_Id); |
| Set_Is_Intrinsic_Subprogram (Act_Decl_Id); |
| |
| if Chars (Gen_Unit) = Name_Unchecked_Conversion then |
| Validate_Unchecked_Conversion (N, Act_Decl_Id); |
| end if; |
| end if; |
| |
| Generate_Definition (Act_Decl_Id); |
| |
| Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit)); |
| Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit)); |
| |
| if not Is_Intrinsic_Subprogram (Gen_Unit) then |
| Check_Elab_Instantiation (N); |
| end if; |
| |
| Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id); |
| |
| -- Subject to change, pending on if other pragmas are inherited ??? |
| |
| Validate_Categorization_Dependency (N, Act_Decl_Id); |
| |
| if not Is_Intrinsic_Subprogram (Act_Decl_Id) then |
| |
| if not Generic_Separately_Compiled (Gen_Unit) then |
| Inherit_Context (Gen_Decl, N); |
| end if; |
| |
| Restore_Private_Views (Pack_Id, False); |
| |
| -- If the context requires a full instantiation, mark node for |
| -- subsequent construction of the body. |
| |
| if (Is_In_Main_Unit (N) |
| or else Is_Inlined (Act_Decl_Id)) |
| and then (Operating_Mode = Generate_Code |
| or else (Operating_Mode = Check_Semantics |
| and then ASIS_Mode)) |
| and then (Expander_Active or else ASIS_Mode) |
| and then not ABE_Is_Certain (N) |
| and then not Is_Eliminated (Act_Decl_Id) |
| then |
| Pending_Instantiations.Increment_Last; |
| Pending_Instantiations.Table (Pending_Instantiations.Last) := |
| (N, Act_Decl, Expander_Active, Current_Sem_Unit); |
| Check_Forward_Instantiation (Gen_Decl); |
| |
| -- The wrapper package is always delayed, because it does |
| -- not constitute a freeze point, but to insure that the |
| -- freeze node is placed properly, it is created directly |
| -- when instantiating the body (otherwise the freeze node |
| -- might appear to early for nested instantiations). |
| |
| elsif Nkind (Parent (N)) = N_Compilation_Unit then |
| |
| -- For ASIS purposes, indicate that the wrapper package has |
| -- replaced the instantiation node. |
| |
| Rewrite (N, Unit (Parent (N))); |
| Set_Unit (Parent (N), N); |
| end if; |
| |
| elsif Nkind (Parent (N)) = N_Compilation_Unit then |
| |
| -- Replace instance node for library-level instantiations |
| -- of intrinsic subprograms, for ASIS use. |
| |
| Rewrite (N, Unit (Parent (N))); |
| Set_Unit (Parent (N), N); |
| end if; |
| |
| if Parent_Installed then |
| Remove_Parent; |
| end if; |
| |
| Restore_Env; |
| Generic_Renamings.Set_Last (0); |
| Generic_Renamings_HTable.Reset; |
| end if; |
| |
| exception |
| when Instantiation_Error => |
| if Parent_Installed then |
| Remove_Parent; |
| end if; |
| end Analyze_Subprogram_Instantiation; |
| |
| ------------------------- |
| -- Get_Associated_Node -- |
| ------------------------- |
| |
| function Get_Associated_Node (N : Node_Id) return Node_Id is |
| Assoc : Node_Id := Associated_Node (N); |
| |
| begin |
| if Nkind (Assoc) /= Nkind (N) then |
| return Assoc; |
| |
| elsif Nkind (Assoc) = N_Aggregate |
| or else Nkind (Assoc) = N_Extension_Aggregate |
| then |
| return Assoc; |
| |
| else |
| -- If the node is part of an inner generic, it may itself have been |
| -- remapped into a further generic copy. Associated_Node is otherwise |
| -- used for the entity of the node, and will be of a different node |
| -- kind, or else N has been rewritten as a literal or function call. |
| |
| while Present (Associated_Node (Assoc)) |
| and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc) |
| loop |
| Assoc := Associated_Node (Assoc); |
| end loop; |
| |
| -- Follow and additional link in case the final node was rewritten. |
| -- This can only happen with nested generic units. |
| |
| if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op) |
| and then Present (Associated_Node (Assoc)) |
| and then (Nkind (Associated_Node (Assoc)) = N_Function_Call |
| or else |
| Nkind (Associated_Node (Assoc)) = N_Explicit_Dereference |
| or else |
| Nkind (Associated_Node (Assoc)) = N_Integer_Literal |
| or else |
| Nkind (Associated_Node (Assoc)) = N_Real_Literal |
| or else |
| Nkind (Associated_Node (Assoc)) = N_String_Literal) |
| then |
| Assoc := Associated_Node (Assoc); |
| end if; |
| |
| return Assoc; |
| end if; |
| end Get_Associated_Node; |
| |
| ------------------------------------------- |
| -- Build_Instance_Compilation_Unit_Nodes -- |
| ------------------------------------------- |
| |
| procedure Build_Instance_Compilation_Unit_Nodes |
| (N : Node_Id; |
| Act_Body : Node_Id; |
| Act_Decl : Node_Id) |
| is |
| Decl_Cunit : Node_Id; |
| Body_Cunit : Node_Id; |
| Citem : Node_Id; |
| New_Main : constant Entity_Id := Defining_Entity (Act_Decl); |
| Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit); |
| |
| begin |
| -- A new compilation unit node is built for the instance declaration |
| |
| Decl_Cunit := |
| Make_Compilation_Unit (Sloc (N), |
| Context_Items => Empty_List, |
| Unit => Act_Decl, |
| Aux_Decls_Node => |
| Make_Compilation_Unit_Aux (Sloc (N))); |
| |
| Set_Parent_Spec (Act_Decl, Parent_Spec (N)); |
| Set_Body_Required (Decl_Cunit, True); |
| |
| -- We use the original instantiation compilation unit as the resulting |
| -- compilation unit of the instance, since this is the main unit. |
| |
| Rewrite (N, Act_Body); |
| Body_Cunit := Parent (N); |
| |
| -- The two compilation unit nodes are linked by the Library_Unit field |
| |
| Set_Library_Unit (Decl_Cunit, Body_Cunit); |
| Set_Library_Unit (Body_Cunit, Decl_Cunit); |
| |
| -- Preserve the private nature of the package if needed. |
| |
| Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit)); |
| |
| -- If the instance is not the main unit, its context, categorization, |
| -- and elaboration entity are not relevant to the compilation. |
| |
| if Parent (N) /= Cunit (Main_Unit) then |
| return; |
| end if; |
| |
| -- The context clause items on the instantiation, which are now |
| -- attached to the body compilation unit (since the body overwrote |
| -- the original instantiation node), semantically belong on the spec, |
| -- so copy them there. It's harmless to leave them on the body as well. |
| -- In fact one could argue that they belong in both places. |
| |
| Citem := First (Context_Items (Body_Cunit)); |
| while Present (Citem) loop |
| Append (New_Copy (Citem), Context_Items (Decl_Cunit)); |
| Next (Citem); |
| end loop; |
| |
| -- Propagate categorization flags on packages, so that they appear |
| -- in ali file for the spec of the unit. |
| |
| if Ekind (New_Main) = E_Package then |
| Set_Is_Pure (Old_Main, Is_Pure (New_Main)); |
| Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main)); |
| Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main)); |
| Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main)); |
| Set_Is_Remote_Call_Interface |
| (Old_Main, Is_Remote_Call_Interface (New_Main)); |
| end if; |
| |
| -- Make entry in Units table, so that binder can generate call to |
| -- elaboration procedure for body, if any. |
| |
| Make_Instance_Unit (Body_Cunit); |
| Main_Unit_Entity := New_Main; |
| Set_Cunit_Entity (Main_Unit, Main_Unit_Entity); |
| |
| -- Build elaboration entity, since the instance may certainly |
| -- generate elaboration code requiring a flag for protection. |
| |
| Build_Elaboration_Entity (Decl_Cunit, New_Main); |
| end Build_Instance_Compilation_Unit_Nodes; |
| |
| ----------------------------------- |
| -- Check_Formal_Package_Instance -- |
| ----------------------------------- |
| |
| -- If the formal has specific parameters, they must match those of the |
| -- actual. Both of them are instances, and the renaming declarations |
| -- for their formal parameters appear in the same order in both. The |
| -- analyzed formal has been analyzed in the context of the current |
| -- instance. |
| |
| procedure Check_Formal_Package_Instance |
| (Formal_Pack : Entity_Id; |
| Actual_Pack : Entity_Id) |
| is |
| E1 : Entity_Id := First_Entity (Actual_Pack); |
| E2 : Entity_Id := First_Entity (Formal_Pack); |
| |
| Expr1 : Node_Id; |
| Expr2 : Node_Id; |
| |
| procedure Check_Mismatch (B : Boolean); |
| -- Common error routine for mismatch between the parameters of |
| -- the actual instance and those of the formal package. |
| |
| function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean; |
| -- The formal may come from a nested formal package, and the actual |
| -- may have been constant-folded. To determine whether the two denote |
| -- the same entity we may have to traverse several definitions to |
| -- recover the ultimate entity that they refer to. |
| |
| function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean; |
| -- Similarly, if the formal comes from a nested formal package, the |
| -- actual may designate the formal through multiple renamings, which |
| -- have to be followed to determine the original variable in question. |
| |
| -------------------- |
| -- Check_Mismatch -- |
| -------------------- |
| |
| procedure Check_Mismatch (B : Boolean) is |
| begin |
| if B then |
| Error_Msg_NE |
| ("actual for & in actual instance does not match formal", |
| Parent (Actual_Pack), E1); |
| end if; |
| end Check_Mismatch; |
| |
| -------------------------------- |
| -- Same_Instantiated_Constant -- |
| -------------------------------- |
| |
| function Same_Instantiated_Constant |
| (E1, E2 : Entity_Id) return Boolean |
| is |
| Ent : Entity_Id; |
| begin |
| Ent := E2; |
| while Present (Ent) loop |
| if E1 = Ent then |
| return True; |
| |
| elsif Ekind (Ent) /= E_Constant then |
| return False; |
| |
| elsif Is_Entity_Name (Constant_Value (Ent)) then |
| if Entity (Constant_Value (Ent)) = E1 then |
| return True; |
| else |
| Ent := Entity (Constant_Value (Ent)); |
| end if; |
| |
| -- The actual may be a constant that has been folded. Recover |
| -- original name. |
| |
| elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then |
| Ent := Entity (Original_Node (Constant_Value (Ent))); |
| else |
| return False; |
| end if; |
| end loop; |
| |
| return False; |
| end Same_Instantiated_Constant; |
| |
| -------------------------------- |
| -- Same_Instantiated_Variable -- |
| -------------------------------- |
| |
| function Same_Instantiated_Variable |
| (E1, E2 : Entity_Id) return Boolean |
| is |
| function Original_Entity (E : Entity_Id) return Entity_Id; |
| -- Follow chain of renamings to the ultimate ancestor. |
| |
| --------------------- |
| -- Original_Entity -- |
| --------------------- |
| |
| function Original_Entity (E : Entity_Id) return Entity_Id is |
| Orig : Entity_Id; |
| |
| begin |
| Orig := E; |
| while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration |
| and then Present (Renamed_Object (Orig)) |
| and then Is_Entity_Name (Renamed_Object (Orig)) |
| loop |
| Orig := Entity (Renamed_Object (Orig)); |
| end loop; |
| |
| return Orig; |
| end Original_Entity; |
| |
| -- Start of processing for Same_Instantiated_Variable |
| |
| begin |
| return Ekind (E1) = Ekind (E2) |
| and then Original_Entity (E1) = Original_Entity (E2); |
| end Same_Instantiated_Variable; |
| |
| -- Start of processing for Check_Formal_Package_Instance |
| |
| begin |
| while Present (E1) |
| and then Present (E2) |
| loop |
| exit when Ekind (E1) = E_Package |
| and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack); |
| |
| if Is_Type (E1) then |
| |
| -- Subtypes must statically match. E1 and E2 are the |
| -- local entities that are subtypes of the actuals. |
| -- Itypes generated for other parameters need not be checked, |
| -- the check will be performed on the parameters themselves. |
| |
| if not Is_Itype (E1) |
| and then not Is_Itype (E2) |
| then |
| Check_Mismatch |
| (not Is_Type (E2) |
| or else Etype (E1) /= Etype (E2) |
| or else not Subtypes_Statically_Match (E1, E2)); |
| end if; |
| |
| elsif Ekind (E1) = E_Constant then |
| |
| -- IN parameters must denote the same static value, or |
| -- the same constant, or the literal null. |
| |
| Expr1 := Expression (Parent (E1)); |
| |
| if Ekind (E2) /= E_Constant then |
| Check_Mismatch (True); |
| goto Next_E; |
| else |
| Expr2 := Expression (Parent (E2)); |
| end if; |
| |
| if Is_Static_Expression (Expr1) then |
| |
| if not Is_Static_Expression (Expr2) then |
| Check_Mismatch (True); |
| |
| elsif Is_Integer_Type (Etype (E1)) then |
| |
| declare |
| V1 : constant Uint := Expr_Value (Expr1); |
| V2 : constant Uint := Expr_Value (Expr2); |
| begin |
| Check_Mismatch (V1 /= V2); |
| end; |
| |
| elsif Is_Real_Type (Etype (E1)) then |
| declare |
| V1 : constant Ureal := Expr_Value_R (Expr1); |
| V2 : constant Ureal := Expr_Value_R (Expr2); |
| begin |
| Check_Mismatch (V1 /= V2); |
| end; |
| |
| elsif Is_String_Type (Etype (E1)) |
| and then Nkind (Expr1) = N_String_Literal |
| then |
| |
| if Nkind (Expr2) /= N_String_Literal then |
| Check_Mismatch (True); |
| else |
| Check_Mismatch |
| (not String_Equal (Strval (Expr1), Strval (Expr2))); |
| end if; |
| end if; |
| |
| elsif Is_Entity_Name (Expr1) then |
| if Is_Entity_Name (Expr2) then |
| if Entity (Expr1) = Entity (Expr2) then |
| null; |
| else |
| Check_Mismatch |
| (not Same_Instantiated_Constant |
| (Entity (Expr1), Entity (Expr2))); |
| end if; |
| else |
| Check_Mismatch (True); |
| end if; |
| |
| elsif Is_Entity_Name (Original_Node (Expr1)) |
| and then Is_Entity_Name (Expr2) |
| and then |
| Same_Instantiated_Constant |
| (Entity (Original_Node (Expr1)), Entity (Expr2)) |
| then |
| null; |
| |
| elsif Nkind (Expr1) = N_Null then |
| Check_Mismatch (Nkind (Expr1) /= N_Null); |
| |
| else |
| Check_Mismatch (True); |
| end if; |
| |
| elsif Ekind (E1) = E_Variable then |
| Check_Mismatch (not Same_Instantiated_Variable (E1, E2)); |
| |
| elsif Ekind (E1) = E_Package then |
| Check_Mismatch |
| (Ekind (E1) /= Ekind (E2) |
| or else Renamed_Object (E1) /= Renamed_Object (E2)); |
| |
| elsif Is_Overloadable (E1) then |
| |
| -- Verify that the names of the entities match. |
| -- What if actual is an attribute ??? |
| |
| Check_Mismatch |
| (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2)); |
| |
| else |
| raise Program_Error; |
| end if; |
| |
| <<Next_E>> |
| Next_Entity (E1); |
| Next_Entity (E2); |
| end loop; |
| end Check_Formal_Package_Instance; |
| |
| --------------------------- |
| -- Check_Formal_Packages -- |
| --------------------------- |
| |
| procedure Check_Formal_Packages (P_Id : Entity_Id) is |
| E : Entity_Id; |
| Formal_P : Entity_Id; |
| |
| begin |
| -- Iterate through the declarations in the instance, looking for |
| -- package renaming declarations that denote instances of formal |
| -- packages. Stop when we find the renaming of the current package |
| -- itself. The declaration for a formal package without a box is |
| -- followed by an internal entity that repeats the instantiation. |
| |
| E := First_Entity (P_Id); |
| while Present (E) loop |
| if Ekind (E) = E_Package then |
| if Renamed_Object (E) = P_Id then |
| exit; |
| |
| elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then |
| null; |
| |
| elsif not Box_Present (Parent (Associated_Formal_Package (E))) then |
| Formal_P := Next_Entity (E); |
| Check_Formal_Package_Instance (Formal_P, E); |
| end if; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| end Check_Formal_Packages; |
| |
| --------------------------------- |
| -- Check_Forward_Instantiation -- |
| --------------------------------- |
| |
| procedure Check_Forward_Instantiation (Decl : Node_Id) is |
| S : Entity_Id; |
| Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl)); |
| |
| begin |
| -- The instantiation appears before the generic body if we are in the |
| -- scope of the unit containing the generic, either in its spec or in |
| -- the package body. and before the generic body. |
| |
| if Ekind (Gen_Comp) = E_Package_Body then |
| Gen_Comp := Spec_Entity (Gen_Comp); |
| end if; |
| |
| if In_Open_Scopes (Gen_Comp) |
| and then No (Corresponding_Body (Decl)) |
| then |
| S := Current_Scope; |
| |
| while Present (S) |
| and then not Is_Compilation_Unit (S) |
| and then not Is_Child_Unit (S) |
| loop |
| if Ekind (S) = E_Package then |
| Set_Has_Forward_Instantiation (S); |
| end if; |
| |
| S := Scope (S); |
| end loop; |
| end if; |
| end Check_Forward_Instantiation; |
| |
| --------------------------- |
| -- Check_Generic_Actuals -- |
| --------------------------- |
| |
| -- The visibility of the actuals may be different between the |
| -- point of generic instantiation and the instantiation of the body. |
| |
| procedure Check_Generic_Actuals |
| (Instance : Entity_Id; |
| Is_Formal_Box : Boolean) |
| is |
| E : Entity_Id; |
| Astype : Entity_Id; |
| |
| function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean; |
| -- For a formal that is an array type, the component type is often |
| -- a previous formal in the same unit. The privacy status of the |
| -- component type will have been examined earlier in the traversal |
| -- of the corresponding actuals, and this status should not be |
| -- modified for the array type itself. |
| -- To detect this case we have to rescan the list of formals, which |
| -- is usually short enough to ignore the resulting inefficiency. |
| |
| function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is |
| Prev : Entity_Id; |
| begin |
| Prev := First_Entity (Instance); |
| while Present (Prev) loop |
| if Is_Type (Prev) |
| and then Nkind (Parent (Prev)) = N_Subtype_Declaration |
| and then Is_Entity_Name (Subtype_Indication (Parent (Prev))) |
| and then Entity (Subtype_Indication (Parent (Prev))) = Typ |
| then |
| return True; |
| elsif Prev = E then |
| return False; |
| else |
| Next_Entity (Prev); |
| end if; |
| end loop; |
| return False; |
| end Denotes_Previous_Actual; |
| |
| -- Start of processing for Check_Generic_Actuals |
| |
| begin |
| E := First_Entity (Instance); |
| while Present (E) loop |
| if Is_Type (E) |
| and then Nkind (Parent (E)) = N_Subtype_Declaration |
| and then Scope (Etype (E)) /= Instance |
| and then Is_Entity_Name (Subtype_Indication (Parent (E))) |
| then |
| if Is_Array_Type (E) |
| and then Denotes_Previous_Actual (Component_Type (E)) |
| then |
| null; |
| else |
| Check_Private_View (Subtype_Indication (Parent (E))); |
| end if; |
| Set_Is_Generic_Actual_Type (E, True); |
| Set_Is_Hidden (E, False); |
| Set_Is_Potentially_Use_Visible (E, |
| In_Use (Instance)); |
| |
| -- We constructed the generic actual type as a subtype of |
| -- the supplied type. This means that it normally would not |
| -- inherit subtype specific attributes of the actual, which |
| -- is wrong for the generic case. |
| |
| Astype := Ancestor_Subtype (E); |
| |
| if No (Astype) then |
| |
| -- can happen when E is an itype that is the full view of |
| -- a private type completed, e.g. with a constrained array. |
| |
| Astype := Base_Type (E); |
| end if; |
| |
| Set_Size_Info (E, (Astype)); |
| Set_RM_Size (E, RM_Size (Astype)); |
| Set_First_Rep_Item (E, First_Rep_Item (Astype)); |
| |
| if Is_Discrete_Or_Fixed_Point_Type (E) then |
| Set_RM_Size (E, RM_Size (Astype)); |
| |
| -- In nested instances, the base type of an access actual |
| -- may itself be private, and need to be exchanged. |
| |
| elsif Is_Access_Type (E) |
| and then Is_Private_Type (Etype (E)) |
| then |
| Check_Private_View |
| (New_Occurrence_Of (Etype (E), Sloc (Instance))); |
| end if; |
| |
| elsif Ekind (E) = E_Package then |
| |
| -- If this is the renaming for the current instance, we're done. |
| -- Otherwise it is a formal package. If the corresponding formal |
| -- was declared with a box, the (instantiations of the) generic |
| -- formal part are also visible. Otherwise, ignore the entity |
| -- created to validate the actuals. |
| |
| if Renamed_Object (E) = Instance then |
| exit; |
| |
| elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then |
| null; |
| |
| -- The visibility of a formal of an enclosing generic is already |
| -- correct. |
| |
| elsif Denotes_Formal_Package (E) then |
| null; |
| |
| elsif Present (Associated_Formal_Package (E)) then |
| if Box_Present (Parent (Associated_Formal_Package (E))) then |
| Check_Generic_Actuals (Renamed_Object (E), True); |
| end if; |
| |
| Set_Is_Hidden (E, False); |
| end if; |
| |
| -- If this is a subprogram instance (in a wrapper package) the |
| -- actual is fully visible. |
| |
| elsif Is_Wrapper_Package (Instance) then |
| Set_Is_Hidden (E, False); |
| |
| else |
| Set_Is_Hidden (E, not Is_Formal_Box); |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| end Check_Generic_Actuals; |
| |
| ------------------------------ |
| -- Check_Generic_Child_Unit -- |
| ------------------------------ |
| |
| procedure Check_Generic_Child_Unit |
| (Gen_Id : Node_Id; |
| Parent_Installed : in out Boolean) |
| is |
| Loc : constant Source_Ptr := Sloc (Gen_Id); |
| Gen_Par : Entity_Id := Empty; |
| Inst_Par : Entity_Id; |
| E : Entity_Id; |
| S : Node_Id; |
| |
| function Find_Generic_Child |
| (Scop : Entity_Id; |
| Id : Node_Id) return Entity_Id; |
| -- Search generic parent for possible child unit with the given name. |
| |
| function In_Enclosing_Instance return Boolean; |
| -- Within an instance of the parent, the child unit may be denoted |
| -- by a simple name, or an abbreviated expanded name. Examine enclosing |
| -- scopes to locate a possible parent instantiation. |
| |
| ------------------------ |
| -- Find_Generic_Child -- |
| ------------------------ |
| |
| function Find_Generic_Child |
| (Scop : Entity_Id; |
| Id : Node_Id) return Entity_Id |
| is |
| E : Entity_Id; |
| |
| begin |
| -- If entity of name is already set, instance has already been |
| -- resolved, e.g. in an enclosing instantiation. |
| |
| if Present (Entity (Id)) then |
| if Scope (Entity (Id)) = Scop then |
| return Entity (Id); |
| else |
| return Empty; |
| end if; |
| |
| else |
| E := First_Entity (Scop); |
| while Present (E) loop |
| if Chars (E) = Chars (Id) |
| and then Is_Child_Unit (E) |
| then |
| if Is_Child_Unit (E) |
| and then not Is_Visible_Child_Unit (E) |
| then |
| Error_Msg_NE |
| ("generic child unit& is not visible", Gen_Id, E); |
| end if; |
| |
| Set_Entity (Id, E); |
| return E; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| |
| return Empty; |
| end if; |
| end Find_Generic_Child; |
| |
| --------------------------- |
| -- In_Enclosing_Instance -- |
| --------------------------- |
| |
| function In_Enclosing_Instance return Boolean is |
| Enclosing_Instance : Node_Id; |
| Instance_Decl : Node_Id; |
| |
| begin |
| Enclosing_Instance := Current_Scope; |
| |
| while Present (Enclosing_Instance) loop |
| Instance_Decl := Unit_Declaration_Node (Enclosing_Instance); |
| |
| if Ekind (Enclosing_Instance) = E_Package |
| and then Is_Generic_Instance (Enclosing_Instance) |
| and then Present |
| (Generic_Parent (Specification (Instance_Decl))) |
| then |
| -- Check whether the generic we are looking for is a child |
| -- of this instance. |
| |
| E := Find_Generic_Child |
| (Generic_Parent (Specification (Instance_Decl)), Gen_Id); |
| exit when Present (E); |
| |
| else |
| E := Empty; |
| end if; |
| |
| Enclosing_Instance := Scope (Enclosing_Instance); |
| end loop; |
| |
| if No (E) then |
| |
| -- Not a child unit |
| |
| Analyze (Gen_Id); |
| return False; |
| |
| else |
| Rewrite (Gen_Id, |
| Make_Expanded_Name (Loc, |
| Chars => Chars (E), |
| Prefix => New_Occurrence_Of (Enclosing_Instance, Loc), |
| Selector_Name => New_Occurrence_Of (E, Loc))); |
| |
| Set_Entity (Gen_Id, E); |
| Set_Etype (Gen_Id, Etype (E)); |
| Parent_Installed := False; -- Already in scope. |
| return True; |
| end if; |
| end In_Enclosing_Instance; |
| |
| -- Start of processing for Check_Generic_Child_Unit |
| |
| begin |
| -- If the name of the generic is given by a selected component, it |
| -- may be the name of a generic child unit, and the prefix is the name |
| -- of an instance of the parent, in which case the child unit must be |
| -- visible. If this instance is not in scope, it must be placed there |
| -- and removed after instantiation, because what is being instantiated |
| -- is not the original child, but the corresponding child present in |
| -- the instance of the parent. |
| |
| -- If the child is instantiated within the parent, it can be given by |
| -- a simple name. In this case the instance is already in scope, but |
| -- the child generic must be recovered from the generic parent as well. |
| |
| if Nkind (Gen_Id) = N_Selected_Component then |
| S := Selector_Name (Gen_Id); |
| Analyze (Prefix (Gen_Id)); |
| Inst_Par := Entity (Prefix (Gen_Id)); |
| |
| if Ekind (Inst_Par) = E_Package |
| and then Present (Renamed_Object (Inst_Par)) |
| then |
| Inst_Par := Renamed_Object (Inst_Par); |
| end if; |
| |
| if Ekind (Inst_Par) = E_Package then |
| if Nkind (Parent (Inst_Par)) = N_Package_Specification then |
| Gen_Par := Generic_Parent (Parent (Inst_Par)); |
| |
| elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name |
| and then |
| Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification |
| then |
| Gen_Par := Generic_Parent (Parent (Parent (Inst_Par))); |
| end if; |
| |
| elsif Ekind (Inst_Par) = E_Generic_Package |
| and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration |
| then |
| -- A formal package may be a real child package, and not the |
| -- implicit instance within a parent. In this case the child is |
| -- not visible and has to be retrieved explicitly as well. |
| |
| Gen_Par := Inst_Par; |
| end if; |
| |
| if Present (Gen_Par) then |
| |
| -- The prefix denotes an instantiation. The entity itself |
| -- may be a nested generic, or a child unit. |
| |
| E := Find_Generic_Child (Gen_Par, S); |
| |
| if Present (E) then |
| Change_Selected_Component_To_Expanded_Name (Gen_Id); |
| Set_Entity (Gen_Id, E); |
| Set_Etype (Gen_Id, Etype (E)); |
| Set_Entity (S, E); |
| Set_Etype (S, Etype (E)); |
| |
| -- Indicate that this is a reference to the parent. |
| |
| if In_Extended_Main_Source_Unit (Gen_Id) then |
| Set_Is_Instantiated (Inst_Par); |
| end if; |
| |
| -- A common mistake is to replicate the naming scheme of |
| -- a hierarchy by instantiating a generic child directly, |
| -- rather than the implicit child in a parent instance: |
| |
| -- generic .. package Gpar is .. |
| -- generic .. package Gpar.Child is .. |
| -- package Par is new Gpar (); |
| |
| -- with Gpar.Child; |
| -- package Par.Child is new Gpar.Child (); |
| -- rather than Par.Child |
| |
| -- In this case the instantiation is within Par, which is |
| -- an instance, but Gpar does not denote Par because we are |
| -- not IN the instance of Gpar, so this is illegal. The test |
| -- below recognizes this particular case. |
| |
| if Is_Child_Unit (E) |
| and then not Comes_From_Source (Entity (Prefix (Gen_Id))) |
| and then (not In_Instance |
| or else Nkind (Parent (Parent (Gen_Id))) = |
| N_Compilation_Unit) |
| then |
| Error_Msg_N |
| ("prefix of generic child unit must be instance of parent", |
| Gen_Id); |
| end if; |
| |
| if not In_Open_Scopes (Inst_Par) |
| and then Nkind (Parent (Gen_Id)) not in |
| N_Generic_Renaming_Declaration |
| then |
| Install_Parent (Inst_Par); |
| Parent_Installed := True; |
| end if; |
| |
| else |
| -- If the generic parent does not contain an entity that |
| -- corresponds to the selector, the instance doesn't either. |
| -- Analyzing the node will yield the appropriate error message. |
| -- If the entity is not a child unit, then it is an inner |
| -- generic in the parent. |
| |
| Analyze (Gen_Id); |
| end if; |
| |
| else |
| Analyze (Gen_Id); |
| |
| if Is_Child_Unit (Entity (Gen_Id)) |
| and then |
| Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration |
| and then not In_Open_Scopes (Inst_Par) |
| then |
| Install_Parent (Inst_Par); |
| Parent_Installed := True; |
| end if; |
| end if; |
| |
| elsif Nkind (Gen_Id) = N_Expanded_Name then |
| |
| -- Entity already present, analyze prefix, whose meaning may be |
| -- an instance in the current context. If it is an instance of |
| -- a relative within another, the proper parent may still have |
| -- to be installed, if they are not of the same generation. |
| |
| Analyze (Prefix (Gen_Id)); |
| Inst_Par := Entity (Prefix (Gen_Id)); |
| |
| if In_Enclosing_Instance then |
| null; |
| |
| elsif Present (Entity (Gen_Id)) |
| and then Is_Child_Unit (Entity (Gen_Id)) |
| and then not In_Open_Scopes (Inst_Par) |
| then |
| Install_Parent (Inst_Par); |
| Parent_Installed := True; |
| end if; |
| |
| elsif In_Enclosing_Instance then |
| |
| -- The child unit is found in some enclosing scope |
| |
| null; |
| |
| else |
| Analyze (Gen_Id); |
| |
| -- If this is the renaming of the implicit child in a parent |
| -- instance, recover the parent name and install it. |
| |
| if Is_Entity_Name (Gen_Id) then |
| E := Entity (Gen_Id); |
| |
| if Is_Generic_Unit (E) |
| and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration |
| and then Is_Child_Unit (Renamed_Object (E)) |
| and then Is_Generic_Unit (Scope (Renamed_Object (E))) |
| and then Nkind (Name (Parent (E))) = N_Expanded_Name |
| then |
| Rewrite (Gen_Id, |
| New_Copy_Tree (Name (Parent (E)))); |
| Inst_Par := Entity (Prefix (Gen_Id)); |
| |
| if not In_Open_Scopes (Inst_Par) then |
| Install_Parent (Inst_Par); |
| Parent_Installed := True; |
| end if; |
| |
| -- If it is a child unit of a non-generic parent, it may be |
| -- use-visible and given by a direct name. Install parent as |
| -- for other cases. |
| |
| elsif Is_Generic_Unit (E) |
| and then Is_Child_Unit (E) |
| and then |
| Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration |
| and then not Is_Generic_Unit (Scope (E)) |
| then |
| if not In_Open_Scopes (Scope (E)) then |
| Install_Parent (Scope (E)); |
| Parent_Installed := True; |
| end if; |
| end if; |
| end if; |
| end if; |
| end Check_Generic_Child_Unit; |
| |
| ----------------------------- |
| -- Check_Hidden_Child_Unit -- |
| ----------------------------- |
| |
| procedure Check_Hidden_Child_Unit |
| (N : Node_Id; |
| Gen_Unit : Entity_Id; |
| Act_Decl_Id : Entity_Id) |
| is |
| Gen_Id : constant Node_Id := Name (N); |
| |
| begin |
| if Is_Child_Unit (Gen_Unit) |
| and then Is_Child_Unit (Act_Decl_Id) |
| and then Nkind (Gen_Id) = N_Expanded_Name |
| and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id) |
| and then Chars (Gen_Unit) = Chars (Act_Decl_Id) |
| then |
| Error_Msg_Node_2 := Scope (Act_Decl_Id); |
| Error_Msg_NE |
| ("generic unit & is implicitly declared in &", |
| Defining_Unit_Name (N), Gen_Unit); |
| Error_Msg_N ("\instance must have different name", |
| Defining_Unit_Name (N)); |
| end if; |
| end Check_Hidden_Child_Unit; |
| |
| ------------------------ |
| -- Check_Private_View -- |
| ------------------------ |
| |
| procedure Check_Private_View (N : Node_Id) is |
| T : constant Entity_Id := Etype (N); |
| BT : Entity_Id; |
| |
| begin |
| -- Exchange views if the type was not private in the generic but is |
| -- private at the point of instantiation. Do not exchange views if |
| -- the scope of the type is in scope. This can happen if both generic |
| -- and instance are sibling units, or if type is defined in a parent. |
| -- In this case the visibility of the type will be correct for all |
| -- semantic checks. |
| |
| if Present (T) then |
| BT := Base_Type (T); |
| |
| if Is_Private_Type (T) |
| and then not Has_Private_View (N) |
| and then Present (Full_View (T)) |
| and then not In_Open_Scopes (Scope (T)) |
| then |
| -- In the generic, the full type was visible. Save the |
| -- private entity, for subsequent exchange. |
| |
| Switch_View (T); |
| |
| elsif Has_Private_View (N) |
| and then not Is_Private_Type (T) |
| and then not Has_Been_Exchanged (T) |
| and then Etype (Get_Associated_Node (N)) /= T |
| then |
| -- Only the private declaration was visible in the generic. If |
| -- the type appears in a subtype declaration, the subtype in the |
| -- instance must have a view compatible with that of its parent, |
| -- which must be exchanged (see corresponding code in Restore_ |
| -- Private_Views). Otherwise, if the type is defined in a parent |
| -- unit, leave full visibility within instance, which is safe. |
| |
| if In_Open_Scopes (Scope (Base_Type (T))) |
| and then not Is_Private_Type (Base_Type (T)) |
| and then Comes_From_Source (Base_Type (T)) |
| then |
| null; |
| |
| elsif Nkind (Parent (N)) = N_Subtype_Declaration |
| or else not In_Private_Part (Scope (Base_Type (T))) |
| then |
| Append_Elmt (T, Exchanged_Views); |
| Exchange_Declarations (Etype (Get_Associated_Node (N))); |
| end if; |
| |
| -- For composite types with inconsistent representation |
| -- exchange component types accordingly. |
| |
| elsif Is_Access_Type (T) |
| and then Is_Private_Type (Designated_Type (T)) |
| and then not Has_Private_View (N) |
| and then Present (Full_View (Designated_Type (T))) |
| then |
| Switch_View (Designated_Type (T)); |
| |
| elsif Is_Array_Type (T) |
| and then Is_Private_Type (Component_Type (T)) |
| and then not Has_Private_View (N) |
| and then Present (Full_View (Component_Type (T))) |
| then |
| Switch_View (Component_Type (T)); |
| |
| elsif Is_Private_Type (T) |
| and then Present (Full_View (T)) |
| and then Is_Array_Type (Full_View (T)) |
| and then Is_Private_Type (Component_Type (Full_View (T))) |
| then |
| Switch_View (T); |
| |
| -- Finally, a non-private subtype may have a private base type, |
| -- which must be exchanged for consistency. This can happen when |
| -- instantiating a package body, when the scope stack is empty |
| -- but in fact the subtype and the base type are declared in an |
| -- enclosing scope. |
| |
| elsif not Is_Private_Type (T) |
| and then not Has_Private_View (N) |
| and then Is_Private_Type (Base_Type (T)) |
| and then Present (Full_View (BT)) |
| and then not Is_Generic_Type (BT) |
| and then not In_Open_Scopes (BT) |
| then |
| Append_Elmt (Full_View (BT), Exchanged_Views); |
| Exchange_Declarations (BT); |
| end if; |
| end if; |
| end Check_Private_View; |
| |
| -------------------------- |
| -- Contains_Instance_Of -- |
| -------------------------- |
| |
| function Contains_Instance_Of |
| (Inner : Entity_Id; |
| Outer : Entity_Id; |
| N : Node_Id) return Boolean |
| is |
| Elmt : Elmt_Id; |
| Scop : Entity_Id; |
| |
| begin |
| Scop := Outer; |
| |
| -- Verify that there are no circular instantiations. We check whether |
| -- the unit contains an instance of the current scope or some enclosing |
| -- scope (in case one of the instances appears in a subunit). Longer |
| -- circularities involving subunits might seem too pathological to |
| -- consider, but they were not too pathological for the authors of |
| -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all |
| -- enclosing generic scopes as containing an instance. |
| |
| loop |
| -- Within a generic subprogram body, the scope is not generic, to |
| -- allow for recursive subprograms. Use the declaration to determine |
| -- whether this is a generic unit. |
| |
| if Ekind (Scop) = E_Generic_Package |
| or else (Is_Subprogram (Scop) |
| and then Nkind (Unit_Declaration_Node (Scop)) = |
| N_Generic_Subprogram_Declaration) |
| then |
| Elmt := First_Elmt (Inner_Instances (Inner)); |
| |
| while Present (Elmt) loop |
| if Node (Elmt) = Scop then |
| Error_Msg_Node_2 := Inner; |
| Error_Msg_NE |
| ("circular Instantiation: & instantiated within &!", |
| N, Scop); |
| return True; |
| |
| elsif Node (Elmt) = Inner then |
| return True; |
| |
| elsif Contains_Instance_Of (Node (Elmt), Scop, N) then |
| Error_Msg_Node_2 := Inner; |
| Error_Msg_NE |
| ("circular Instantiation: & instantiated within &!", |
| N, Node (Elmt)); |
| return True; |
| end if; |
| |
| Next_Elmt (Elmt); |
| end loop; |
| |
| -- Indicate that Inner is being instantiated within Scop. |
| |
| Append_Elmt (Inner, Inner_Instances (Scop)); |
| end if; |
| |
| if Scop = Standard_Standard then |
| exit; |
| else |
| Scop := Scope (Scop); |
| end if; |
| end loop; |
| |
| return False; |
| end Contains_Instance_Of; |
| |
| ----------------------- |
| -- Copy_Generic_Node -- |
| ----------------------- |
| |
| function Copy_Generic_Node |
| (N : Node_Id; |
| Parent_Id : Node_Id; |
| Instantiating : Boolean) return Node_Id |
| is |
| Ent : Entity_Id; |
| New_N : Node_Id; |
| |
| function Copy_Generic_Descendant (D : Union_Id) return Union_Id; |
| -- Check the given value of one of the Fields referenced by the |
| -- current node to determine whether to copy it recursively. The |
| -- field may hold a Node_Id, a List_Id, or an Elist_Id, or a plain |
| -- value (Sloc, Uint, Char) in which case it need not be copied. |
| |
| procedure Copy_Descendants; |
| -- Common utility for various nodes. |
| |
| function Copy_Generic_Elist (E : Elist_Id) return Elist_Id; |
| -- Make copy of element list. |
| |
| function Copy_Generic_List |
| (L : List_Id; |
| Parent_Id : Node_Id) return List_Id; |
| -- Apply Copy_Node recursively to the members of a node list. |
| |
| function In_Defining_Unit_Name (Nam : Node_Id) return Boolean; |
| -- True if an identifier is part of the defining program unit name |
| -- of a child unit. The entity of such an identifier must be kept |
| -- (for ASIS use) even though as the name of an enclosing generic |
| -- it would otherwise not be preserved in the generic tree. |
| |
| ---------------------- |
| -- Copy_Descendants -- |
| ---------------------- |
| |
| procedure Copy_Descendants is |
| |
| use Atree.Unchecked_Access; |
| -- This code section is part of the implementation of an untyped |
| -- tree traversal, so it needs direct access to node fields. |
| |
| begin |
| Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N))); |
| Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N))); |
| Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N))); |
| Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N))); |
| Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N))); |
| end Copy_Descendants; |
| |
| ----------------------------- |
| -- Copy_Generic_Descendant -- |
| ----------------------------- |
| |
| function Copy_Generic_Descendant (D : Union_Id) return Union_Id is |
| begin |
| if D = Union_Id (Empty) then |
| return D; |
| |
| elsif D in Node_Range then |
| return Union_Id |
| (Copy_Generic_Node (Node_Id (D), New_N, Instantiating)); |
| |
| elsif D in List_Range then |
| return Union_Id (Copy_Generic_List (List_Id (D), New_N)); |
| |
| elsif D in Elist_Range then |
| return Union_Id (Copy_Generic_Elist (Elist_Id (D))); |
| |
| -- Nothing else is copyable (e.g. Uint values), return as is |
| |
| else |
| return D; |
| end if; |
| end Copy_Generic_Descendant; |
| |
| ------------------------ |
| -- Copy_Generic_Elist -- |
| ------------------------ |
| |
| function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is |
| M : Elmt_Id; |
| L : Elist_Id; |
| |
| begin |
| if Present (E) then |
| L := New_Elmt_List; |
| M := First_Elmt (E); |
| while Present (M) loop |
| Append_Elmt |
| (Copy_Generic_Node (Node (M), Empty, Instantiating), L); |
| Next_Elmt (M); |
| end loop; |
| |
| return L; |
| |
| else |
| return No_Elist; |
| end if; |
| end Copy_Generic_Elist; |
| |
| ----------------------- |
| -- Copy_Generic_List -- |
| ----------------------- |
| |
| function Copy_Generic_List |
| (L : List_Id; |
| Parent_Id : Node_Id) return List_Id |
| is |
| N : Node_Id; |
| New_L : List_Id; |
| |
| begin |
| if Present (L) then |
| New_L := New_List; |
| Set_Parent (New_L, Parent_Id); |
| |
| N := First (L); |
| while Present (N) loop |
| Append (Copy_Generic_Node (N, Empty, Instantiating), New_L); |
| Next (N); |
| end loop; |
| |
| return New_L; |
| |
| else |
| return No_List; |
| end if; |
| end Copy_Generic_List; |
| |
| --------------------------- |
| -- In_Defining_Unit_Name -- |
| --------------------------- |
| |
| function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is |
| begin |
| return Present (Parent (Nam)) |
| and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name |
| or else |
| (Nkind (Parent (Nam)) = N_Expanded_Name |
| and then In_Defining_Unit_Name (Parent (Nam)))); |
| end In_Defining_Unit_Name; |
| |
| -- Start of processing for Copy_Generic_Node |
| |
| begin |
| if N = Empty then |
| return N; |
| end if; |
| |
| New_N := New_Copy (N); |
| |
| if Instantiating then |
| Adjust_Instantiation_Sloc (New_N, S_Adjustment); |
| end if; |
| |
| if not Is_List_Member (N) then |
| Set_Parent (New_N, Parent_Id); |
| end if; |
| |
| -- If defining identifier, then all fields have been copied already |
| |
| if Nkind (New_N) in N_Entity then |
| null; |
| |
| -- Special casing for identifiers and other entity names and operators |
| |
| elsif Nkind (New_N) = N_Identifier |
| or else Nkind (New_N) = N_Character_Literal |
| or else Nkind (New_N) = N_Expanded_Name |
| or else Nkind (New_N) = N_Operator_Symbol |
| or else Nkind (New_N) in N_Op |
| then |
| if not Instantiating then |
| |
| -- Link both nodes in order to assign subsequently the |
| -- entity of the copy to the original node, in case this |
| -- is a global reference. |
| |
| Set_Associated_Node (N, New_N); |
| |
| -- If we are within an instantiation, this is a nested generic |
| -- that has already been analyzed at the point of definition. We |
| -- must preserve references that were global to the enclosing |
| -- parent at that point. Other occurrences, whether global or |
| -- local to the current generic, must be resolved anew, so we |
| -- reset the entity in the generic copy. A global reference has |
| -- a smaller depth than the parent, or else the same depth in |
| -- case both are distinct compilation units. |
| |
| -- It is also possible for Current_Instantiated_Parent to be |
| -- defined, and for this not to be a nested generic, namely |
| -- if the unit is loaded through Rtsfind. In that case, the |
| -- entity of New_N is only a link to the associated node, and |
| -- not a defining occurrence. |
| |
| -- The entities for parent units in the defining_program_unit |
| -- of a generic child unit are established when the context of |
| -- the unit is first analyzed, before the generic copy is made. |
| -- They are preserved in the copy for use in ASIS queries. |
| |
| Ent := Entity (New_N); |
| |
| if No (Current_Instantiated_Parent.Gen_Id) then |
| if No (Ent) |
| or else Nkind (Ent) /= N_Defining_Identifier |
| or else not In_Defining_Unit_Name (N) |
| then |
| Set_Associated_Node (New_N, Empty); |
| end if; |
| |
| elsif No (Ent) |
| or else |
| not (Nkind (Ent) = N_Defining_Identifier |
| or else |
| Nkind (Ent) = N_Defining_Character_Literal |
| or else |
| Nkind (Ent) = N_Defining_Operator_Symbol) |
| or else No (Scope (Ent)) |
| or else Scope (Ent) = Current_Instantiated_Parent.Gen_Id |
| or else (Scope_Depth (Scope (Ent)) > |
| Scope_Depth (Current_Instantiated_Parent.Gen_Id) |
| and then |
| Get_Source_Unit (Ent) = |
| Get_Source_Unit (Current_Instantiated_Parent.Gen_Id)) |
| then |
| Set_Associated_Node (New_N, Empty); |
| end if; |
| |
| -- Case of instantiating identifier or some other name or operator |
| |
| else |
| -- If the associated node is still defined, the entity in |
| -- it is global, and must be copied to the instance. |
| -- If this copy is being made for a body to inline, it is |
| -- applied to an instantiated tree, and the entity is already |
| -- present and must be also preserved. |
| |
| declare |
| Assoc : constant Node_Id := Get_Associated_Node (N); |
| begin |
| if Present (Assoc) then |
| if Nkind (Assoc) = Nkind (N) then |
| Set_Entity (New_N, Entity (Assoc)); |
| Check_Private_View (N); |
| |
| elsif Nkind (Assoc) = N_Function_Call then |
| Set_Entity (New_N, Entity (Name (Assoc))); |
| |
| elsif (Nkind (Assoc) = N_Defining_Identifier |
| or else Nkind (Assoc) = N_Defining_Character_Literal |
| or else Nkind (Assoc) = N_Defining_Operator_Symbol) |
| and then Expander_Active |
| then |
| -- Inlining case: we are copying a tree that contains |
| -- global entities, which are preserved in the copy |
| -- to be used for subsequent inlining. |
| |
| null; |
| |
| else |
| Set_Entity (New_N, Empty); |
| end if; |
| end if; |
| end; |
| end if; |
| |
| -- For expanded name, we must copy the Prefix and Selector_Name |
| |
| if Nkind (N) = N_Expanded_Name then |
| Set_Prefix |
| (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating)); |
| |
| Set_Selector_Name (New_N, |
| Copy_Generic_Node (Selector_Name (N), New_N, Instantiating)); |
| |
| -- For operators, we must copy the right operand |
| |
| elsif Nkind (N) in N_Op then |
| Set_Right_Opnd (New_N, |
| Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating)); |
| |
| -- And for binary operators, the left operand as well |
| |
| if Nkind (N) in N_Binary_Op then |
| Set_Left_Opnd (New_N, |
| Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating)); |
| end if; |
| end if; |
| |
| -- Special casing for stubs |
| |
| elsif Nkind (N) in N_Body_Stub then |
| |
| -- In any case, we must copy the specification or defining |
| -- identifier as appropriate. |
| |
| if Nkind (N) = N_Subprogram_Body_Stub then |
| Set_Specification (New_N, |
| Copy_Generic_Node (Specification (N), New_N, Instantiating)); |
| |
| else |
| Set_Defining_Identifier (New_N, |
| Copy_Generic_Node |
| (Defining_Identifier (N), New_N, Instantiating)); |
| end if; |
| |
| -- If we are not instantiating, then this is where we load and |
| -- analyze subunits, i.e. at the point where the stub occurs. A |
| -- more permissivle system might defer this analysis to the point |
| -- of instantiation, but this seems to complicated for now. |
| |
| if not Instantiating then |
| declare |
| Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N); |
| Subunit : Node_Id; |
| Unum : Unit_Number_Type; |
| New_Body : Node_Id; |
| |
| begin |
| Unum := |
| Load_Unit |
| (Load_Name => Subunit_Name, |
| Required => False, |
| Subunit => True, |
| Error_Node => N); |
| |
| -- If the proper body is not found, a warning message will |
| -- be emitted when analyzing the stub, or later at the the |
| -- point of instantiation. Here we just leave the stub as is. |
| |
| if Unum = No_Unit then |
| Subunits_Missing := True; |
| goto Subunit_Not_Found; |
| end if; |
| |
| Subunit := Cunit (Unum); |
| |
| if Nkind (Unit (Subunit)) /= N_Subunit then |
| Error_Msg_Sloc := Sloc (N); |
| Error_Msg_N |
| ("expected SEPARATE subunit to complete stub at#," |
| & " found child unit", Subunit); |
| goto Subunit_Not_Found; |
| end if; |
| |
| -- We must create a generic copy of the subunit, in order |
| -- to perform semantic analysis on it, and we must replace |
| -- the stub in the original generic unit with the subunit, |
| -- in order to preserve non-local references within. |
| |
| -- Only the proper body needs to be copied. Library_Unit and |
| -- context clause are simply inherited by the generic copy. |
| -- Note that the copy (which may be recursive if there are |
| -- nested subunits) must be done first, before attaching it |
| -- to the enclosing generic. |
| |
| New_Body := |
| Copy_Generic_Node |
| (Proper_Body (Unit (Subunit)), |
| Empty, Instantiating => False); |
| |
| -- Now place the original proper body in the original |
| -- generic unit. This is a body, not a compilation unit. |
| |
| Rewrite (N, Proper_Body (Unit (Subunit))); |
| Set_Is_Compilation_Unit (Defining_Entity (N), False); |
| Set_Was_Originally_Stub (N); |
| |
| -- Finally replace the body of the subunit with its copy, |
| -- and make this new subunit into the library unit of the |
| -- generic copy, which does not have stubs any longer. |
| |
| Set_Proper_Body (Unit (Subunit), New_Body); |
| Set_Library_Unit (New_N, Subunit); |
| Inherit_Context (Unit (Subunit), N); |
| end; |
| |
| -- If we are instantiating, this must be an error case, since |
| -- otherwise we would have replaced the stub node by the proper |
| -- body that corresponds. So just ignore it in the copy (i.e. |
| -- we have copied it, and that is good enough). |
| |
| else |
| null; |
| end if; |
| |
| <<Subunit_Not_Found>> null; |
| |
| -- If the node is a compilation unit, it is the subunit of a stub, |
| -- which has been loaded already (see code below). In this case, |
| -- the library unit field of N points to the parent unit (which |
| -- is a compilation unit) and need not (and cannot!) be copied. |
| |
| -- When the proper body of the stub is analyzed, thie library_unit |
| -- link is used to establish the proper context (see sem_ch10). |
| |
| -- The other fields of a compilation unit are copied as usual |
| |
| elsif Nkind (N) = N_Compilation_Unit then |
| |
| -- This code can only be executed when not instantiating, because |
| -- in the copy made for an instantiation, the compilation unit |
| -- node has disappeared at the point that a stub is replaced by |
| -- its proper body. |
| |
| pragma Assert (not Instantiating); |
| |
| Set_Context_Items (New_N, |
| Copy_Generic_List (Context_Items (N), New_N)); |
| |
| Set_Unit (New_N, |
| Copy_Generic_Node (Unit (N), New_N, False)); |
| |
| Set_First_Inlined_Subprogram (New_N, |
| Copy_Generic_Node |
| (First_Inlined_Subprogram (N), New_N, False)); |
| |
| Set_Aux_Decls_Node (New_N, |
| Copy_Generic_Node (Aux_Decls_Node (N), New_N, False)); |
| |
| -- For an assignment node, the assignment is known to be semantically |
| -- legal if we are instantiating the template. This avoids incorrect |
| -- diagnostics in generated code. |
| |
| elsif Nkind (N) = N_Assignment_Statement then |
| |
| -- Copy name and expression fields in usual manner |
| |
| Set_Name (New_N, |
| Copy_Generic_Node (Name (N), New_N, Instantiating)); |
| |
| Set_Expression (New_N, |
| Copy_Generic_Node (Expression (N), New_N, Instantiating)); |
| |
| if Instantiating then |
| Set_Assignment_OK (Name (New_N), True); |
| end if; |
| |
| elsif Nkind (N) = N_Aggregate |
| or else Nkind (N) = N_Extension_Aggregate |
| then |
| |
| if not Instantiating then |
| Set_Associated_Node (N, New_N); |
| |
| else |
| if Present (Get_Associated_Node (N)) |
| and then Nkind (Get_Associated_Node (N)) = Nkind (N) |
| then |
| -- In the generic the aggregate has some composite type. If at |
| -- the point of instantiation the type has a private view, |
| -- install the full view (and that of its ancestors, if any). |
| |
| declare |
| T : Entity_Id := (Etype (Get_Associated_Node (New_N))); |
| Rt : Entity_Id; |
| |
| begin |
| if Present (T) |
| and then Is_Private_Type (T) |
| then |
| Switch_View (T); |
| end if; |
| |
| if Present (T) |
| and then Is_Tagged_Type (T) |
| and then Is_Derived_Type (T) |
| then |
| Rt := Root_Type (T); |
| |
| loop |
| T := Etype (T); |
| |
| if Is_Private_Type (T) then |
| Switch_View (T); |
| end if; |
| |
| exit when T = Rt; |
| end loop; |
| end if; |
| end; |
| end if; |
| end if; |
| |
| -- Do not copy the associated node, which points to |
| -- the generic copy of the aggregate. |
| |
| declare |
| use Atree.Unchecked_Access; |
| -- This code section is part of the implementation of an untyped |
| -- tree traversal, so it needs direct access to node fields. |
| |
| begin |
| Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N))); |
| Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N))); |
| Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N))); |
| Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N))); |
| end; |
| |
| -- Allocators do not have an identifier denoting the access type, |
| -- so we must locate it through the expression to check whether |
| -- the views are consistent. |
| |
| elsif Nkind (N) = N_Allocator |
| and then Nkind (Expression (N)) = N_Qualified_Expression |
| and then Is_Entity_Name (Subtype_Mark (Expression (N))) |
| and then Instantiating |
| then |
| declare |
| T : constant Node_Id := |
| Get_Associated_Node (Subtype_Mark (Expression (N))); |
| Acc_T : Entity_Id; |
| |
| begin |
| if Present (T) then |
| -- Retrieve the allocator node in the generic copy. |
| |
| Acc_T := Etype (Parent (Parent (T))); |
| if Present (Acc_T) |
| and then Is_Private_Type (Acc_T) |
| then |
| Switch_View (Acc_T); |
| end if; |
| end if; |
| |
| Copy_Descendants; |
| end; |
| |
| -- For a proper body, we must catch the case of a proper body that |
| -- replaces a stub. This represents the point at which a separate |
| -- compilation unit, and hence template file, may be referenced, so |
| -- we must make a new source instantiation entry for the template |
| -- of the subunit, and ensure that all nodes in the subunit are |
| -- adjusted using this new source instantiation entry. |
| |
| elsif Nkind (N) in N_Proper_Body then |
| declare |
| Save_Adjustment : constant Sloc_Adjustment := S_Adjustment; |
| |
| begin |
| if Instantiating and then Was_Originally_Stub (N) then |
| Create_Instantiation_Source |
| (Instantiation_Node, |
| Defining_Entity (N), |
| False, |
| S_Adjustment); |
| end if; |
| |
| -- Now copy the fields of the proper body, using the new |
| -- adjustment factor if one was needed as per test above. |
| |
| Copy_Descendants; |
| |
| -- Restore the original adjustment factor in case changed |
| |
| S_Adjustment := Save_Adjustment; |
| end; |
| |
| -- Don't copy Ident or Comment pragmas, since the comment belongs |
| -- to the generic unit, not to the instantiating unit. |
| |
| elsif Nkind (N) = N_Pragma |
| and then Instantiating |
| then |
| declare |
| Prag_Id : constant Pragma_Id := Get_Pragma_Id (Chars (N)); |
| |
| begin |
| if Prag_Id = Pragma_Ident |
| or else Prag_Id = Pragma_Comment |
| then |
| New_N := Make_Null_Statement (Sloc (N)); |
| |
| else |
| Copy_Descendants; |
| end if; |
| end; |
| |
| elsif Nkind (N) = N_Integer_Literal |
| or else Nkind (N) = N_Real_Literal |
| then |
| -- No descendant fields need traversing |
| |
| null; |
| |
| -- For the remaining nodes, copy recursively their descendants |
| |
| else |
| Copy_Descendants; |
| |
| if Instantiating |
| and then Nkind (N) = N_Subprogram_Body |
| then |
| Set_Generic_Parent (Specification (New_N), N); |
| end if; |
| end if; |
| |
| return New_N; |
| end Copy_Generic_Node; |
| |
| ---------------------------- |
| -- Denotes_Formal_Package -- |
| ---------------------------- |
| |
| function Denotes_Formal_Package |
| (Pack : Entity_Id; |
| On_Exit : Boolean := False) return Boolean |
| is |
| Par : Entity_Id; |
| Scop : constant Entity_Id := Scope (Pack); |
| E : Entity_Id; |
| |
| begin |
| if On_Exit then |
| Par := |
| Instance_Envs.Table |
| (Instance_Envs.Last).Instantiated_Parent.Act_Id; |
| else |
| Par := Current_Instantiated_Parent.Act_Id; |
| end if; |
| |
| if Ekind (Scop) = E_Generic_Package |
| or else Nkind (Unit_Declaration_Node (Scop)) = |
| N_Generic_Subprogram_Declaration |
| then |
| return True; |
| |
| elsif Nkind (Parent (Pack)) = N_Formal_Package_Declaration then |
| return True; |
| |
| elsif No (Par) then |
| return False; |
| |
| else |
| -- Check whether this package is associated with a formal |
| -- package of the enclosing instantiation. Iterate over the |
| -- list of renamings. |
| |
| E := First_Entity (Par); |
| while Present (E) loop |
| if Ekind (E) /= E_Package |
| or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration |
| then |
| null; |
| elsif Renamed_Object (E) = Par then |
| return False; |
| |
| elsif Renamed_Object (E) = Pack then |
| return True; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| |
| return False; |
| end if; |
| end Denotes_Formal_Package; |
| |
| ----------------- |
| -- End_Generic -- |
| ----------------- |
| |
| procedure End_Generic is |
| begin |
| -- ??? More things could be factored out in this |
| -- routine. Should probably be done at a later stage. |
| |
| Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last); |
| Generic_Flags.Decrement_Last; |
| |
| Expander_Mode_Restore; |
| end End_Generic; |
| |
| ---------------------- |
| -- Find_Actual_Type -- |
| ---------------------- |
| |
| function Find_Actual_Type |
| (Typ : Entity_Id; |
| Gen_Scope : Entity_Id) return Entity_Id |
| is |
| T : Entity_Id; |
| |
| begin |
| if not Is_Child_Unit (Gen_Scope) then |
| return Get_Instance_Of (Typ); |
| |
| elsif not Is_Generic_Type (Typ) |
| or else Scope (Typ) = Gen_Scope |
| then |
| return Get_Instance_Of (Typ); |
| |
| else |
| T := Current_Entity (Typ); |
| while Present (T) loop |
| if In_Open_Scopes (Scope (T)) then |
| return T; |
| end if; |
| |
| T := Homonym (T); |
| end loop; |
| |
| return Typ; |
| end if; |
| end Find_Actual_Type; |
| |
| ---------------------------- |
| -- Freeze_Subprogram_Body -- |
| ---------------------------- |
| |
| procedure Freeze_Subprogram_Body |
| (Inst_Node : Node_Id; |
| Gen_Body : Node_Id; |
| Pack_Id : Entity_Id) |
| is |
| F_Node : Node_Id; |
| Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); |
| Par : constant Entity_Id := Scope (Gen_Unit); |
| Enc_G : Entity_Id; |
| Enc_I : Node_Id; |
| E_G_Id : Entity_Id; |
| |
| function Earlier (N1, N2 : Node_Id) return Boolean; |
| -- Yields True if N1 and N2 appear in the same compilation unit, |
| -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right |
| -- traversal of the tree for the unit. |
| |
| function Enclosing_Body (N : Node_Id) return Node_Id; |
| -- Find innermost package body that encloses the given node, and which |
| -- is not a compilation unit. Freeze nodes for the instance, or for its |
| -- enclosing body, may be inserted after the enclosing_body of the |
| -- generic unit. |
| |
| function Package_Freeze_Node (B : Node_Id) return Node_Id; |
| -- Find entity for given package body, and locate or create a freeze |
| -- node for it. |
| |
| function True_Parent (N : Node_Id) return Node_Id; |
| -- For a subunit, return parent of corresponding stub. |
| |
| ------------- |
| -- Earlier -- |
| ------------- |
| |
| function Earlier (N1, N2 : Node_Id) return Boolean is |
| D1 : Integer := 0; |
| D2 : Integer := 0; |
| P1 : Node_Id := N1; |
| P2 : Node_Id := N2; |
| |
| procedure Find_Depth (P : in out Node_Id; D : in out Integer); |
| -- Find distance from given node to enclosing compilation unit. |
| |
| ---------------- |
| -- Find_Depth -- |
| ---------------- |
| |
| procedure Find_Depth (P : in out Node_Id; D : in out Integer) is |
| begin |
| while Present (P) |
| and then Nkind (P) /= N_Compilation_Unit |
| loop |
| P := True_Parent (P); |
| D := D + 1; |
| end loop; |
| end Find_Depth; |
| |
| -- Start of procesing for Earlier |
| |
| begin |
| Find_Depth (P1, D1); |
| Find_Depth (P2, D2); |
| |
| if P1 /= P2 then |
| return False; |
| else |
| P1 := N1; |
| P2 := N2; |
| end if; |
| |
| while D1 > D2 loop |
| P1 := True_Parent (P1); |
| D1 := D1 - 1; |
| end loop; |
| |
| while D2 > D1 loop |
| P2 := True_Parent (P2); |
| D2 := D2 - 1; |
| end loop; |
| |
| -- At this point P1 and P2 are at the same distance from the root. |
| -- We examine their parents until we find a common declarative |
| -- list, at which point we can establish their relative placement |
| -- by comparing their ultimate slocs. If we reach the root, |
| -- N1 and N2 do not descend from the same declarative list (e.g. |
| -- one is nested in the declarative part and the other is in a block |
| -- in the statement part) and the earlier one is already frozen. |
| |
| while not Is_List_Member (P1) |
| or else not Is_List_Member (P2) |
| or else List_Containing (P1) /= List_Containing (P2) |
| loop |
| P1 := True_Parent (P1); |
| P2 := True_Parent (P2); |
| |
| if Nkind (Parent (P1)) = N_Subunit then |
| P1 := Corresponding_Stub (Parent (P1)); |
| end if; |
| |
| if Nkind (Parent (P2)) = N_Subunit then |
| P2 := Corresponding_Stub (Parent (P2)); |
| end if; |
| |
| if P1 = P2 then |
| return False; |
| end if; |
| end loop; |
| |
| return |
| Top_Level_Location (Sloc (P1)) < Top_Level_Location (Sloc (P2)); |
| end Earlier; |
| |
| -------------------- |
| -- Enclosing_Body -- |
| -------------------- |
| |
| function Enclosing_Body (N : Node_Id) return Node_Id is |
| P : Node_Id := Parent (N); |
| |
| begin |
| while Present (P) |
| and then Nkind (Parent (P)) /= N_Compilation_Unit |
| loop |
| if Nkind (P) = N_Package_Body then |
| |
| if Nkind (Parent (P)) = N_Subunit then |
| return Corresponding_Stub (Parent (P)); |
| else |
| return P; |
| end if; |
| end if; |
| |
| P := True_Parent (P); |
| end loop; |
| |
| return Empty; |
| end Enclosing_Body; |
| |
| ------------------------- |
| -- Package_Freeze_Node -- |
| ------------------------- |
| |
| function Package_Freeze_Node (B : Node_Id) return Node_Id is |
| Id : Entity_Id; |
| |
| begin |
| if Nkind (B) = N_Package_Body then |
| Id := Corresponding_Spec (B); |
| |
| else pragma Assert (Nkind (B) = N_Package_Body_Stub); |
| Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B)))); |
| end if; |
| |
| Ensure_Freeze_Node (Id); |
| return Freeze_Node (Id); |
| end Package_Freeze_Node; |
| |
| ----------------- |
| -- True_Parent -- |
| ----------------- |
| |
| function True_Parent (N : Node_Id) return Node_Id is |
| begin |
| if Nkind (Parent (N)) = N_Subunit then |
| return Parent (Corresponding_Stub (Parent (N))); |
| else |
| return Parent (N); |
| end if; |
| end True_Parent; |
| |
| -- Start of processing of Freeze_Subprogram_Body |
| |
| begin |
| -- If the instance and the generic body appear within the same |
| -- unit, and the instance preceeds the generic, the freeze node for |
| -- the instance must appear after that of the generic. If the generic |
| -- is nested within another instance I2, then current instance must |
| -- be frozen after I2. In both cases, the freeze nodes are those of |
| -- enclosing packages. Otherwise, the freeze node is placed at the end |
| -- of the current declarative part. |
| |
| Enc_G := Enclosing_Body (Gen_Body); |
| Enc_I := Enclosing_Body (Inst_Node); |
| Ensure_Freeze_Node (Pack_Id); |
| F_Node := Freeze_Node (Pack_Id); |
| |
| if Is_Generic_Instance (Par) |
| and then Present (Freeze_Node (Par)) |
| and then |
| In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node) |
| then |
| if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then |
| |
| -- The parent was a premature instantiation. Insert freeze |
| -- node at the end the current declarative part. |
| |
| Insert_After_Last_Decl (Inst_Node, F_Node); |
| |
| else |
| Insert_After (Freeze_Node (Par), F_Node); |
| end if; |
| |
| -- The body enclosing the instance should be frozen after the body |
| -- that includes the generic, because the body of the instance may |
| -- make references to entities therein. If the two are not in the |
| -- same declarative part, or if the one enclosing the instance is |
| -- frozen already, freeze the instance at the end of the current |
| -- declarative part. |
| |
| elsif Is_Generic_Instance (Par) |
| and then Present (Freeze_Node (Par)) |
| and then Present (Enc_I) |
| then |
| if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I) |
| or else |
| (Nkind (Enc_I) = N_Package_Body |
| and then |
| In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I))) |
| then |
| -- The enclosing package may contain several instances. Rather |
| -- than computing the earliest point at which to insert its |
| -- freeze node, we place it at the end of the declarative part |
| -- of the parent of the generic. |
| |
| Insert_After_Last_Decl |
| (Freeze_Node (Par), Package_Freeze_Node (Enc_I)); |
| end if; |
| |
| Insert_After_Last_Decl (Inst_Node, F_Node); |
| |
| elsif Present (Enc_G) |
| and then Present (Enc_I) |
| and then Enc_G /= Enc_I |
| and then Earlier (Inst_Node, Gen_Body) |
| then |
| if Nkind (Enc_G) = N_Package_Body then |
| E_G_Id := Corresponding_Spec (Enc_G); |
| else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub); |
| E_G_Id := |
| Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G)))); |
| end if; |
| |
| -- Freeze package that encloses instance, and place node after |
| -- package that encloses generic. If enclosing package is already |
| -- frozen we have to assume it is at the proper place. This may |
| -- be a potential ABE that requires dynamic checking. |
| |
| Insert_After_Last_Decl (Enc_G, Package_Freeze_Node (Enc_I)); |
| |
| -- Freeze enclosing subunit before instance |
| |
| Ensure_Freeze_Node (E_G_Id); |
| |
| if not Is_List_Member (Freeze_Node (E_G_Id)) then |
| Insert_After (Enc_G, Freeze_Node (E_G_Id)); |
| end if; |
| |
| Insert_After_Last_Decl (Inst_Node, F_Node); |
| |
| else |
| -- If none of the above, insert freeze node at the end of the |
| -- current declarative part. |
| |
| Insert_After_Last_Decl (Inst_Node, F_Node); |
| end if; |
| end Freeze_Subprogram_Body; |
| |
| ---------------- |
| -- Get_Gen_Id -- |
| ---------------- |
| |
| function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is |
| begin |
| return Generic_Renamings.Table (E).Gen_Id; |
| end Get_Gen_Id; |
| |
| --------------------- |
| -- Get_Instance_Of -- |
| --------------------- |
| |
| function Get_Instance_Of (A : Entity_Id) return Entity_Id is |
| Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A); |
| |
| begin |
| if Res /= Assoc_Null then |
| return Generic_Renamings.Table (Res).Act_Id; |
| else |
| -- On exit, entity is not instantiated: not a generic parameter, |
| -- or else parameter of an inner generic unit. |
| |
| return A; |
| end if; |
| end Get_Instance_Of; |
| |
| ------------------------------------ |
| -- Get_Package_Instantiation_Node -- |
| ------------------------------------ |
| |
| function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is |
| Decl : Node_Id := Unit_Declaration_Node (A); |
| Inst : Node_Id; |
| |
| begin |
| -- If the instantiation is a compilation unit that does not need a |
| -- body then the instantiation node has been rewritten as a package |
| -- declaration for the instance, and we return the original node. |
| |
| -- If it is a compilation unit and the instance node has not been |
| -- rewritten, then it is still the unit of the compilation. Finally, |
| -- if a body is present, this is a parent of the main unit whose body |
| -- has been compiled for inlining purposes, and the instantiation node |
| -- has been rewritten with the instance body. |
| |
| -- Otherwise the instantiation node appears after the declaration. |
| -- If the entity is a formal package, the declaration may have been |
| -- rewritten as a generic declaration (in the case of a formal with a |
| -- box) or left as a formal package declaration if it has actuals, and |
| -- is found with a forward search. |
| |
| if Nkind (Parent (Decl)) = N_Compilation_Unit then |
| if Nkind (Decl) = N_Package_Declaration |
| and then Present (Corresponding_Body (Decl)) |
| then |
| Decl := Unit_Declaration_Node (Corresponding_Body (Decl)); |
| end if; |
| |
| if Nkind (Original_Node (Decl)) = N_Package_Instantiation then |
| return Original_Node (Decl); |
| else |
| return Unit (Parent (Decl)); |
| end if; |
| |
| elsif Nkind (Decl) = N_Generic_Package_Declaration |
| and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration |
| then |
| return Original_Node (Decl); |
| |
| else |
| Inst := Next (Decl); |
| while Nkind (Inst) /= N_Package_Instantiation |
| and then Nkind (Inst) /= N_Formal_Package_Declaration |
| loop |
| Next (Inst); |
| end loop; |
| |
| return Inst; |
| end if; |
| end Get_Package_Instantiation_Node; |
| |
| ------------------------ |
| -- Has_Been_Exchanged -- |
| ------------------------ |
| |
| function Has_Been_Exchanged (E : Entity_Id) return Boolean is |
| Next : Elmt_Id := First_Elmt (Exchanged_Views); |
| |
| begin |
| while Present (Next) loop |
| if Full_View (Node (Next)) = E then |
| return True; |
| end if; |
| |
| Next_Elmt (Next); |
| end loop; |
| |
| return False; |
| end Has_Been_Exchanged; |
| |
| ---------- |
| -- Hash -- |
| ---------- |
| |
| function Hash (F : Entity_Id) return HTable_Range is |
| begin |
| return HTable_Range (F mod HTable_Size); |
| end Hash; |
| |
| ------------------------ |
| -- Hide_Current_Scope -- |
| ------------------------ |
| |
| procedure Hide_Current_Scope is |
| C : constant Entity_Id := Current_Scope; |
| E : Entity_Id; |
| |
| begin |
| Set_Is_Hidden_Open_Scope (C); |
| E := First_Entity (C); |
| |
| while Present (E) loop |
| if Is_Immediately_Visible (E) then |
| Set_Is_Immediately_Visible (E, False); |
| Append_Elmt (E, Hidden_Entities); |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| |
| -- Make the scope name invisible as well. This is necessary, but |
| -- might conflict with calls to Rtsfind later on, in case the scope |
| -- is a predefined one. There is no clean solution to this problem, so |
| -- for now we depend on the user not redefining Standard itself in one |
| -- of the parent units. |
| |
| if Is_Immediately_Visible (C) |
| and then C /= Standard_Standard |
| then |
| Set_Is_Immediately_Visible (C, False); |
| Append_Elmt (C, Hidden_Entities); |
| end if; |
| |
| end Hide_Current_Scope; |
| |
| -------------- |
| -- Init_Env -- |
| -------------- |
| |
| procedure Init_Env is |
| Saved : Instance_Env; |
| |
| begin |
| Saved.Ada_Version := Ada_Version; |
| Saved.Instantiated_Parent := Current_Instantiated_Parent; |
| Saved.Exchanged_Views := Exchanged_Views; |
| Saved.Hidden_Entities := Hidden_Entities; |
| Saved.Current_Sem_Unit := Current_Sem_Unit; |
| Instance_Envs.Increment_Last; |
| Instance_Envs.Table (Instance_Envs.Last) := Saved; |
| |
| Exchanged_Views := New_Elmt_List; |
| Hidden_Entities := New_Elmt_List; |
| |
| -- Make dummy entry for Instantiated parent. If generic unit is |
| -- legal, this is set properly in Set_Instance_Env. |
| |
| Current_Instantiated_Parent := |
| (Current_Scope, Current_Scope, Assoc_Null); |
| end Init_Env; |
| |
| ------------------------------ |
| -- In_Same_Declarative_Part -- |
| ------------------------------ |
| |
| function In_Same_Declarative_Part |
| (F_Node : Node_Id; |
| Inst : Node_Id) return Boolean |
| is |
| Decls : constant Node_Id := Parent (F_Node); |
| Nod : Node_Id := Parent (Inst); |
| |
| begin |
| while Present (Nod) loop |
| if Nod = Decls then |
| return True; |
| |
| elsif Nkind (Nod) = N_Subprogram_Body |
| or else Nkind (Nod) = N_Package_Body |
| or else Nkind (Nod) = N_Task_Body |
| or else Nkind (Nod) = N_Protected_Body |
| or else Nkind (Nod) = N_Block_Statement |
| then |
| return False; |
| |
| elsif Nkind (Nod) = N_Subunit then |
| Nod := Corresponding_Stub (Nod); |
| |
| elsif Nkind (Nod) = N_Compilation_Unit then |
| return False; |
| else |
| Nod := Parent (Nod); |
| end if; |
| end loop; |
| |
| return False; |
| end In_Same_Declarative_Part; |
| |
| --------------------- |
| -- In_Main_Context -- |
| --------------------- |
| |
| function In_Main_Context (E : Entity_Id) return Boolean is |
| Context : List_Id; |
| Clause : Node_Id; |
| Nam : Node_Id; |
| |
| begin |
| if not Is_Compilation_Unit (E) |
| or else Ekind (E) /= E_Package |
| or else In_Private_Part (E) |
| then |
| return False; |
| end if; |
| |
| Context := Context_Items (Cunit (Main_Unit)); |
| |
| Clause := First (Context); |
| while Present (Clause) loop |
| if Nkind (Clause) = N_With_Clause then |
| Nam := Name (Clause); |
| |
| -- If the current scope is part of the context of the main unit, |
| -- analysis of the corresponding with_clause is not complete, and |
| -- the entity is not set. We use the Chars field directly, which |
| -- might produce false positives in rare cases, but guarantees |
| -- that we produce all the instance bodies we will need. |
| |
| if (Nkind (Nam) = N_Identifier |
| and then Chars (Nam) = Chars (E)) |
| or else (Nkind (Nam) = N_Selected_Component |
| and then Chars (Selector_Name (Nam)) = Chars (E)) |
| then |
| return True; |
| end if; |
| end if; |
| |
| Next (Clause); |
| end loop; |
| |
| return False; |
| end In_Main_Context; |
| |
| --------------------- |
| -- Inherit_Context -- |
| --------------------- |
| |
| procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is |
| Current_Context : List_Id; |
| Current_Unit : Node_Id; |
| Item : Node_Id; |
| New_I : Node_Id; |
| |
| begin |
| if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then |
| |
| -- The inherited context is attached to the enclosing compilation |
| -- unit. This is either the main unit, or the declaration for the |
| -- main unit (in case the instantation appears within the package |
| -- declaration and the main unit is its body). |
| |
| Current_Unit := Parent (Inst); |
| while Present (Current_Unit) |
| and then Nkind (Current_Unit) /= N_Compilation_Unit |
| loop |
| Current_Unit := Parent (Current_Unit); |
| end loop; |
| |
| Current_Context := Context_Items (Current_Unit); |
| |
| Item := First (Context_Items (Parent (Gen_Decl))); |
| while Present (Item) loop |
| if Nkind (Item) = N_With_Clause then |
| New_I := New_Copy (Item); |
| Set_Implicit_With (New_I, True); |
| Append (New_I, Current_Context); |
| end if; |
| |
| Next (Item); |
| end loop; |
| end if; |
| end Inherit_Context; |
| |
| ---------------- |
| -- Initialize -- |
| ---------------- |
| |
| procedure Initialize is |
| begin |
| Generic_Renamings.Init; |
| Instance_Envs.Init; |
| Generic_Flags.Init; |
| Generic_Renamings_HTable.Reset; |
| Circularity_Detected := False; |
| Exchanged_Views := No_Elist; |
| Hidden_Entities := No_Elist; |
| end Initialize; |
| |
| ---------------------------- |
| -- Insert_After_Last_Decl -- |
| ---------------------------- |
| |
| procedure Insert_After_Last_Decl (N : Node_Id; F_Node : Node_Id) is |
| L : List_Id := List_Containing (N); |
| P : constant Node_Id := Parent (L); |
| |
| begin |
| if not Is_List_Member (F_Node) then |
| if Nkind (P) = N_Package_Specification |
| and then L = Visible_Declarations (P) |
| and then Present (Private_Declarations (P)) |
| and then not Is_Empty_List (Private_Declarations (P)) |
| then |
| L := Private_Declarations (P); |
| end if; |
| |
| Insert_After (Last (L), F_Node); |
| end if; |
| end Insert_After_Last_Decl; |
| |
| ------------------ |
| -- Install_Body -- |
| ------------------ |
| |
| procedure Install_Body |
| (Act_Body : Node_Id; |
| N : Node_Id; |
| Gen_Body : Node_Id; |
| Gen_Decl : Node_Id) |
| is |
| Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body); |
| Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N))); |
| Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body); |
| Par : constant Entity_Id := Scope (Gen_Id); |
| Gen_Unit : constant Node_Id := |
| Unit (Cunit (Get_Source_Unit (Gen_Decl))); |
| Orig_Body : Node_Id := Gen_Body; |
| F_Node : Node_Id; |
| Body_Unit : Node_Id; |
| |
| Must_Delay : Boolean; |
| |
| function Enclosing_Subp (Id : Entity_Id) return Entity_Id; |
| -- Find subprogram (if any) that encloses instance and/or generic body. |
| |
| function True_Sloc (N : Node_Id) return Source_Ptr; |
| -- If the instance is nested inside a generic unit, the Sloc of the |
| -- instance indicates the place of the original definition, not the |
| -- point of the current enclosing instance. Pending a better usage of |
| -- Slocs to indicate instantiation places, we determine the place of |
| -- origin of a node by finding the maximum sloc of any ancestor node. |
| -- Why is this not equivalent fo Top_Level_Location ??? |
| |
| -------------------- |
| -- Enclosing_Subp -- |
| -------------------- |
| |
| function Enclosing_Subp (Id : Entity_Id) return Entity_Id is |
| Scop : Entity_Id := Scope (Id); |
| |
| begin |
| while Scop /= Standard_Standard |
| and then not Is_Overloadable (Scop) |
| loop |
| Scop := Scope (Scop); |
| end loop; |
| |
| return Scop; |
| end Enclosing_Subp; |
| |
| --------------- |
| -- True_Sloc -- |
| --------------- |
| |
| function True_Sloc (N : Node_Id) return Source_Ptr is |
| Res : Source_Ptr; |
| N1 : Node_Id; |
| |
| begin |
| Res := Sloc (N); |
| N1 := N; |
| while Present (N1) and then N1 /= Act_Unit loop |
| if Sloc (N1) > Res then |
| Res := Sloc (N1); |
| end if; |
| |
| N1 := Parent (N1); |
| end loop; |
| |
| return Res; |
| end True_Sloc; |
| |
| -- Start of processing for Install_Body |
| |
| begin |
| -- If the body is a subunit, the freeze point is the corresponding |
| -- stub in the current compilation, not the subunit itself. |
| |
| if Nkind (Parent (Gen_Body)) = N_Subunit then |
| Orig_Body := Corresponding_Stub (Parent (Gen_Body)); |
| else |
| Orig_Body := Gen_Body; |
| end if; |
| |
| Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body))); |
| |
| -- If the instantiation and the generic definition appear in the |
| -- same package declaration, this is an early instantiation. |
| -- If they appear in the same declarative part, it is an early |
| -- instantiation only if the generic body appears textually later, |
| -- and the generic body is also in the main unit. |
| |
| -- If instance is nested within a subprogram, and the generic body is |
| -- not, the instance is delayed because the enclosing body is. If |
| -- instance and body are within the same scope, or the same sub- |
| -- program body, indicate explicitly that the instance is delayed. |
| |
| Must_Delay := |
| (Gen_Unit = Act_Unit |
| and then ((Nkind (Gen_Unit) = N_Package_Declaration) |
| or else Nkind (Gen_Unit) = N_Generic_Package_Declaration |
| or else (Gen_Unit = Body_Unit |
| and then True_Sloc (N) < Sloc (Orig_Body))) |
| and then Is_In_Main_Unit (Gen_Unit) |
| and then (Scope (Act_Id) = Scope (Gen_Id) |
| or else |
| Enclosing_Subp (Act_Id) = Enclosing_Subp (Gen_Id))); |
| |
| -- If this is an early instantiation, the freeze node is placed after |
| -- the generic body. Otherwise, if the generic appears in an instance, |
| -- we cannot freeze the current instance until the outer one is frozen. |
| -- This is only relevant if the current instance is nested within some |
| -- inner scope not itself within the outer instance. If this scope is |
| -- a package body in the same declarative part as the outer instance, |
| -- then that body needs to be frozen after the outer instance. Finally, |
| -- if no delay is needed, we place the freeze node at the end of the |
| -- current declarative part. |
| |
| if Expander_Active then |
| Ensure_Freeze_Node (Act_Id); |
| F_Node := Freeze_Node (Act_Id); |
| |
| if Must_Delay then |
| Insert_After (Orig_Body, F_Node); |
| |
| elsif Is_Generic_Instance (Par) |
| and then Present (Freeze_Node (Par)) |
| and then Scope (Act_Id) /= Par |
| then |
| -- Freeze instance of inner generic after instance of enclosing |
| -- generic. |
| |
| if In_Same_Declarative_Part (Freeze_Node (Par), N) then |
| Insert_After (Freeze_Node (Par), F_Node); |
| |
| -- Freeze package enclosing instance of inner generic after |
| -- instance of enclosing generic. |
| |
| elsif Nkind (Parent (N)) = N_Package_Body |
| and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N)) |
| then |
| |
| declare |
| Enclosing : constant Entity_Id := |
| Corresponding_Spec (Parent (N)); |
| |
| begin |
| Insert_After_Last_Decl (N, F_Node); |
| Ensure_Freeze_Node (Enclosing); |
| |
| if not Is_List_Member (Freeze_Node (Enclosing)) then |
| Insert_After (Freeze_Node (Par), Freeze_Node (Enclosing)); |
| end if; |
| end; |
| |
| else |
| Insert_After_Last_Decl (N, F_Node); |
| end if; |
| |
| else |
| Insert_After_Last_Decl (N, F_Node); |
| end if; |
| end if; |
| |
| Set_Is_Frozen (Act_Id); |
| Insert_Before (N, Act_Body); |
| Mark_Rewrite_Insertion (Act_Body); |
| end Install_Body; |
| |
| -------------------- |
| -- Install_Parent -- |
| -------------------- |
| |
| procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is |
| Ancestors : constant Elist_Id := New_Elmt_List; |
| S : constant Entity_Id := Current_Scope; |
| Inst_Par : Entity_Id; |
| First_Par : Entity_Id; |
| Inst_Node : Node_Id; |
| Gen_Par : Entity_Id; |
| First_Gen : Entity_Id; |
| Elmt : Elmt_Id; |
| |
| procedure Install_Formal_Packages (Par : Entity_Id); |
| -- If any of the formals of the parent are formal packages with box, |
| -- their formal parts are visible in the parent and thus in the child |
| -- unit as well. Analogous to what is done in Check_Generic_Actuals |
| -- for the unit itself. |
| |
| procedure Install_Noninstance_Specs (Par : Entity_Id); |
| -- Install the scopes of noninstance parent units ending with Par. |
| |
| procedure Install_Spec (Par : Entity_Id); |
| -- The child unit is within the declarative part of the parent, so |
| -- the declarations within the parent are immediately visible. |
| |
| ----------------------------- |
| -- Install_Formal_Packages -- |
| ----------------------------- |
| |
| procedure Install_Formal_Packages (Par : Entity_Id) is |
| E : Entity_Id; |
| |
| begin |
| E := First_Entity (Par); |
| |
| while Present (E) loop |
| |
| if Ekind (E) = E_Package |
| and then Nkind (Parent (E)) = N_Package_Renaming_Declaration |
| then |
| -- If this is the renaming for the parent instance, done. |
| |
| if Renamed_Object (E) = Par then |
| exit; |
| |
| -- The visibility of a formal of an enclosing generic is |
| -- already correct. |
| |
| elsif Denotes_Formal_Package (E) then |
| null; |
| |
| elsif Present (Associated_Formal_Package (E)) |
| and then Box_Present (Parent (Associated_Formal_Package (E))) |
| then |
| Check_Generic_Actuals (Renamed_Object (E), True); |
| Set_Is_Hidden (E, False); |
| end if; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| end Install_Formal_Packages; |
| |
| ------------------------------- |
| -- Install_Noninstance_Specs -- |
| ------------------------------- |
| |
| procedure Install_Noninstance_Specs (Par : Entity_Id) is |
| begin |
| if Present (Par) |
| and then Par /= Standard_Standard |
| and then not In_Open_Scopes (Par) |
| then |
| Install_Noninstance_Specs (Scope (Par)); |
| Install_Spec (Par); |
| end if; |
| end Install_Noninstance_Specs; |
| |
| ------------------ |
| -- Install_Spec -- |
| ------------------ |
| |
| procedure Install_Spec (Par : Entity_Id) is |
| Spec : constant Node_Id := |
| Specification (Unit_Declaration_Node (Par)); |
| |
| begin |
| New_Scope (Par); |
| Set_Is_Immediately_Visible (Par); |
| Install_Visible_Declarations (Par); |
| Install_Private_Declarations (Par); |
| Set_Use (Visible_Declarations (Spec)); |
| Set_Use (Private_Declarations (Spec)); |
| end Install_Spec; |
| |
| -- Start of processing for Install_Parent |
| |
| begin |
| -- We need to install the parent instance to compile the instantiation |
| -- of the child, but the child instance must appear in the current |
| -- scope. Given that we cannot place the parent above the current |
| -- scope in the scope stack, we duplicate the current scope and unstack |
| -- both after the instantiation is complete. |
| |
| -- If the parent is itself the instantiation of a child unit, we must |
| -- also stack the instantiation of its parent, and so on. Each such |
| -- ancestor is the prefix of the name in a prior instantiation. |
| |
| -- If this is a nested instance, the parent unit itself resolves to |
| -- a renaming of the parent instance, whose declaration we need. |
| |
| -- Finally, the parent may be a generic (not an instance) when the |
| -- child unit appears as a formal package. |
| |
| Inst_Par := P; |
| |
| if Present (Renamed_Entity (Inst_Par)) then |
| Inst_Par := Renamed_Entity (Inst_Par); |
| end if; |
| |
| First_Par := Inst_Par; |
| |
| Gen_Par := |
| Generic_Parent (Specification (Unit_Declaration_Node (Inst_Par))); |
| |
| First_Gen := Gen_Par; |
| |
| while Present (Gen_Par) |
| and then Is_Child_Unit (Gen_Par) |
| loop |
| -- Load grandparent instance as well |
| |
| Inst_Node := Get_Package_Instantiation_Node (Inst_Par); |
| |
| if Nkind (Name (Inst_Node)) = N_Expanded_Name then |
| Inst_Par := Entity (Prefix (Name (Inst_Node))); |
| |
| if Present (Renamed_Entity (Inst_Par)) then |
| Inst_Par := Renamed_Entity (Inst_Par); |
| end if; |
| |
| Gen_Par := |
| Generic_Parent |
| (Specification (Unit_Declaration_Node (Inst_Par))); |
| |
| if Present (Gen_Par) then |
| Prepend_Elmt (Inst_Par, Ancestors); |
| |
| else |
| -- Parent is not the name of an instantiation |
| |
| Install_Noninstance_Specs (Inst_Par); |
| |
| exit; |
| end if; |
| |
| else |
| -- Previous error |
| |
| exit; |
| end if; |
| end loop; |
| |
| if Present (First_Gen) then |
| Append_Elmt (First_Par, Ancestors); |
| |
| else |
| Install_Noninstance_Specs (First_Par); |
| end if; |
| |
| if not Is_Empty_Elmt_List (Ancestors) then |
| Elmt := First_Elmt (Ancestors); |
| |
| while Present (Elmt) loop |
| Install_Spec (Node (Elmt)); |
| Install_Formal_Packages (Node (Elmt)); |
| |
| Next_Elmt (Elmt); |
| end loop; |
| end if; |
| |
| if not In_Body then |
| New_Scope (S); |
| end if; |
| end Install_Parent; |
| |
| -------------------------------- |
| -- Instantiate_Formal_Package -- |
| -------------------------------- |
| |
| function Instantiate_Formal_Package |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id) return List_Id |
| is |
| Loc : constant Source_Ptr := Sloc (Actual); |
| Actual_Pack : Entity_Id; |
| Formal_Pack : Entity_Id; |
| Gen_Parent : Entity_Id; |
| Decls : List_Id; |
| Nod : Node_Id; |
| Parent_Spec : Node_Id; |
| |
| procedure Find_Matching_Actual |
| (F : Node_Id; |
| Act : in out Entity_Id); |
| -- We need to associate each formal entity in the formal package |
| -- with the corresponding entity in the actual package. The actual |
| -- package has been analyzed and possibly expanded, and as a result |
| -- there is no one-to-one correspondence between the two lists (for |
| -- example, the actual may include subtypes, itypes, and inherited |
| -- primitive operations, interspersed among the renaming declarations |
| -- for the actuals) . We retrieve the corresponding actual by name |
| -- because each actual has the same name as the formal, and they do |
| -- appear in the same order. |
| |
| function Formal_Entity |
| (F : Node_Id; |
| Act_Ent : Entity_Id) return Entity_Id; |
| -- Returns the entity associated with the given formal F. In the |
| -- case where F is a formal package, this function will iterate |
| -- through all of F's formals and enter map associations from the |
| -- actuals occurring in the formal package's corresponding actual |
| -- package (obtained via Act_Ent) to the formal package's formal |
| -- parameters. This function is called recursively for arbitrary |
| -- levels of formal packages. |
| |
| function Is_Instance_Of |
| (Act_Spec : Entity_Id; |
| Gen_Anc : Entity_Id) return Boolean; |
| -- The actual can be an instantiation of a generic within another |
| -- instance, in which case there is no direct link from it to the |
| -- original generic ancestor. In that case, we recognize that the |
| -- ultimate ancestor is the same by examining names and scopes. |
| |
| procedure Map_Entities (Form : Entity_Id; Act : Entity_Id); |
| -- Within the generic part, entities in the formal package are |
| -- visible. To validate subsequent type declarations, indicate |
| -- the correspondence betwen the entities in the analyzed formal, |
| -- and the entities in the actual package. There are three packages |
| -- involved in the instantiation of a formal package: the parent |
| -- generic P1 which appears in the generic declaration, the fake |
| -- instantiation P2 which appears in the analyzed generic, and whose |
| -- visible entities may be used in subsequent formals, and the actual |
| -- P3 in the instance. To validate subsequent formals, me indicate |
| -- that the entities in P2 are mapped into those of P3. The mapping of |
| -- entities has to be done recursively for nested packages. |
| |
| procedure Process_Nested_Formal (Formal : Entity_Id); |
| -- If the current formal is declared with a box, its own formals are |
| -- visible in the instance, as they were in the generic, and their |
| -- Hidden flag must be reset. If some of these formals are themselves |
| -- packages declared with a box, the processing must be recursive. |
| |
| -------------------------- |
| -- Find_Matching_Actual -- |
| -------------------------- |
| |
| procedure Find_Matching_Actual |
| (F : Node_Id; |
| Act : in out Entity_Id) |
| is |
| Formal_Ent : Entity_Id; |
| |
| begin |
| case Nkind (Original_Node (F)) is |
| when N_Formal_Object_Declaration | |
| N_Formal_Type_Declaration => |
| Formal_Ent := Defining_Identifier (F); |
| |
| while Chars (Act) /= Chars (Formal_Ent) loop |
| Next_Entity (Act); |
| end loop; |
| |
| when N_Formal_Subprogram_Declaration | |
| N_Formal_Package_Declaration | |
| N_Package_Declaration | |
| N_Generic_Package_Declaration => |
| Formal_Ent := Defining_Entity (F); |
| |
| while Chars (Act) /= Chars (Formal_Ent) loop |
| Next_Entity (Act); |
| end loop; |
| |
| when others => |
| raise Program_Error; |
| end case; |
| end Find_Matching_Actual; |
| |
| ------------------- |
| -- Formal_Entity -- |
| ------------------- |
| |
| function Formal_Entity |
| (F : Node_Id; |
| Act_Ent : Entity_Id) return Entity_Id |
| is |
| Orig_Node : Node_Id := F; |
| Act_Pkg : Entity_Id; |
| |
| begin |
| case Nkind (Original_Node (F)) is |
| when N_Formal_Object_Declaration => |
| return Defining_Identifier (F); |
| |
| when N_Formal_Type_Declaration => |
| return Defining_Identifier (F); |
| |
| when N_Formal_Subprogram_Declaration => |
| return Defining_Unit_Name (Specification (F)); |
| |
| when N_Package_Declaration => |
| return Defining_Unit_Name (Specification (F)); |
| |
| when N_Formal_Package_Declaration | |
| N_Generic_Package_Declaration => |
| |
| if Nkind (F) = N_Generic_Package_Declaration then |
| Orig_Node := Original_Node (F); |
| end if; |
| |
| Act_Pkg := Act_Ent; |
| |
| -- Find matching actual package, skipping over itypes and |
| -- other entities generated when analyzing the formal. We |
| -- know that if the instantiation is legal then there is |
| -- a matching package for the formal. |
| |
| while Ekind (Act_Pkg) /= E_Package loop |
| Act_Pkg := Next_Entity (Act_Pkg); |
| end loop; |
| |
| declare |
| Actual_Ent : Entity_Id := First_Entity (Act_Pkg); |
| Formal_Node : Node_Id; |
| Formal_Ent : Entity_Id; |
| |
| Gen_Decl : constant Node_Id := |
| Unit_Declaration_Node |
| (Entity (Name (Orig_Node))); |
| |
| Formals : constant List_Id := |
| Generic_Formal_Declarations (Gen_Decl); |
| |
| begin |
| if Present (Formals) then |
| Formal_Node := First_Non_Pragma (Formals); |
| else |
| Formal_Node := Empty; |
| end if; |
| |
| while Present (Actual_Ent) |
| and then Present (Formal_Node) |
| and then Actual_Ent /= First_Private_Entity (Act_Ent) |
| loop |
| -- ??? Are the following calls also needed here: |
| -- |
| -- Set_Is_Hidden (Actual_Ent, False); |
| -- Set_Is_Potentially_Use_Visible |
| -- (Actual_Ent, In_Use (Act_Ent)); |
| |
| Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent); |
| if Present (Formal_Ent) then |
| Set_Instance_Of (Formal_Ent, Actual_Ent); |
| end if; |
| Next_Non_Pragma (Formal_Node); |
| |
| Next_Entity (Actual_Ent); |
| end loop; |
| end; |
| |
| return Defining_Identifier (Orig_Node); |
| |
| when N_Use_Package_Clause => |
| return Empty; |
| |
| when N_Use_Type_Clause => |
| return Empty; |
| |
| -- We return Empty for all other encountered forms of |
| -- declarations because there are some cases of nonformal |
| -- sorts of declaration that can show up (e.g., when array |
| -- formals are present). Since it's not clear what kinds |
| -- can appear among the formals, we won't raise failure here. |
| |
| when others => |
| return Empty; |
| |
| end case; |
| end Formal_Entity; |
| |
| -------------------- |
| -- Is_Instance_Of -- |
| -------------------- |
| |
| function Is_Instance_Of |
| (Act_Spec : Entity_Id; |
| Gen_Anc : Entity_Id) return Boolean |
| is |
| Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec); |
| |
| begin |
| if No (Gen_Par) then |
| return False; |
| |
| -- Simplest case: the generic parent of the actual is the formal. |
| |
| elsif Gen_Par = Gen_Anc then |
| return True; |
| |
| elsif Chars (Gen_Par) /= Chars (Gen_Anc) then |
| return False; |
| |
| -- The actual may be obtained through several instantiations. Its |
| -- scope must itself be an instance of a generic declared in the |
| -- same scope as the formal. Any other case is detected above. |
| |
| elsif not Is_Generic_Instance (Scope (Gen_Par)) then |
| return False; |
| |
| else |
| return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc); |
| end if; |
| end Is_Instance_Of; |
| |
| ------------------ |
| -- Map_Entities -- |
| ------------------ |
| |
| procedure Map_Entities (Form : Entity_Id; Act : Entity_Id) is |
| E1 : Entity_Id; |
| E2 : Entity_Id; |
| |
| begin |
| Set_Instance_Of (Form, Act); |
| |
| -- Traverse formal and actual package to map the corresponding |
| -- entities. We skip over internal entities that may be generated |
| -- during semantic analysis, and find the matching entities by |
| -- name, given that they must appear in the same order. |
| |
| E1 := First_Entity (Form); |
| E2 := First_Entity (Act); |
| while Present (E1) |
| and then E1 /= First_Private_Entity (Form) |
| loop |
| if not Is_Internal (E1) |
| and then not Is_Class_Wide_Type (E1) |
| and then Present (Parent (E1)) |
| then |
| while Present (E2) |
| and then Chars (E2) /= Chars (E1) |
| loop |
| Next_Entity (E2); |
| end loop; |
| |
| if No (E2) then |
| exit; |
| else |
| Set_Instance_Of (E1, E2); |
| |
| if Is_Type (E1) |
| and then Is_Tagged_Type (E2) |
| then |
| Set_Instance_Of |
| (Class_Wide_Type (E1), Class_Wide_Type (E2)); |
| end if; |
| |
| if Ekind (E1) = E_Package |
| and then No (Renamed_Object (E1)) |
| then |
| Map_Entities (E1, E2); |
| end if; |
| end if; |
| end if; |
| |
| Next_Entity (E1); |
| end loop; |
| end Map_Entities; |
| |
| --------------------------- |
| -- Process_Nested_Formal -- |
| --------------------------- |
| |
| procedure Process_Nested_Formal (Formal : Entity_Id) is |
| Ent : Entity_Id; |
| |
| begin |
| if Present (Associated_Formal_Package (Formal)) |
| and then Box_Present (Parent (Associated_Formal_Package (Formal))) |
| then |
| Ent := First_Entity (Formal); |
| while Present (Ent) loop |
| Set_Is_Hidden (Ent, False); |
| Set_Is_Potentially_Use_Visible |
| (Ent, Is_Potentially_Use_Visible (Formal)); |
| |
| if Ekind (Ent) = E_Package then |
| exit when Renamed_Entity (Ent) = Renamed_Entity (Formal); |
| Process_Nested_Formal (Ent); |
| end if; |
| |
| Next_Entity (Ent); |
| end loop; |
| end if; |
| end Process_Nested_Formal; |
| |
| -- Start of processing for Instantiate_Formal_Package |
| |
| begin |
| Analyze (Actual); |
| |
| if not Is_Entity_Name (Actual) |
| or else Ekind (Entity (Actual)) /= E_Package |
| then |
| Error_Msg_N |
| ("expect package instance to instantiate formal", Actual); |
| Abandon_Instantiation (Actual); |
| raise Program_Error; |
| |
| else |
| Actual_Pack := Entity (Actual); |
| Set_Is_Instantiated (Actual_Pack); |
| |
| -- The actual may be a renamed package, or an outer generic |
| -- formal package whose instantiation is converted into a renaming. |
| |
| if Present (Renamed_Object (Actual_Pack)) then |
| Actual_Pack := Renamed_Object (Actual_Pack); |
| end if; |
| |
| if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then |
| Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal))); |
| Formal_Pack := Defining_Identifier (Analyzed_Formal); |
| else |
| Gen_Parent := |
| Generic_Parent (Specification (Analyzed_Formal)); |
| Formal_Pack := |
| Defining_Unit_Name (Specification (Analyzed_Formal)); |
| end if; |
| |
| if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then |
| Parent_Spec := Specification (Unit_Declaration_Node (Actual_Pack)); |
| else |
| Parent_Spec := Parent (Actual_Pack); |
| end if; |
| |
| if Gen_Parent = Any_Id then |
| Error_Msg_N |
| ("previous error in declaration of formal package", Actual); |
| Abandon_Instantiation (Actual); |
| |
| elsif |
| Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent)) |
| then |
| null; |
| |
| else |
| Error_Msg_NE |
| ("actual parameter must be instance of&", Actual, Gen_Parent); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack); |
| Map_Entities (Formal_Pack, Actual_Pack); |
| |
| Nod := |
| Make_Package_Renaming_Declaration (Loc, |
| Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)), |
| Name => New_Reference_To (Actual_Pack, Loc)); |
| |
| Set_Associated_Formal_Package (Defining_Unit_Name (Nod), |
| Defining_Identifier (Formal)); |
| Decls := New_List (Nod); |
| |
| -- If the formal F has a box, then the generic declarations are |
| -- visible in the generic G. In an instance of G, the corresponding |
| -- entities in the actual for F (which are the actuals for the |
| -- instantiation of the generic that F denotes) must also be made |
| -- visible for analysis of the current instance. On exit from the |
| -- current instance, those entities are made private again. If the |
| -- actual is currently in use, these entities are also use-visible. |
| |
| -- The loop through the actual entities also steps through the |
| -- formal entities and enters associations from formals to |
| -- actuals into the renaming map. This is necessary to properly |
| -- handle checking of actual parameter associations for later |
| -- formals that depend on actuals declared in the formal package. |
| |
| if Box_Present (Formal) then |
| declare |
| Gen_Decl : constant Node_Id := |
| Unit_Declaration_Node (Gen_Parent); |
| Formals : constant List_Id := |
| Generic_Formal_Declarations (Gen_Decl); |
| Actual_Ent : Entity_Id; |
| Formal_Node : Node_Id; |
| Formal_Ent : Entity_Id; |
| |
| begin |
| if Present (Formals) then |
| Formal_Node := First_Non_Pragma (Formals); |
| else |
| Formal_Node := Empty; |
| end if; |
| |
| Actual_Ent := First_Entity (Actual_Pack); |
| |
| while Present (Actual_Ent) |
| and then Actual_Ent /= First_Private_Entity (Actual_Pack) |
| loop |
| Set_Is_Hidden (Actual_Ent, False); |
| Set_Is_Potentially_Use_Visible |
| (Actual_Ent, In_Use (Actual_Pack)); |
| |
| if Ekind (Actual_Ent) = E_Package then |
| Process_Nested_Formal (Actual_Ent); |
| end if; |
| |
| if Present (Formal_Node) then |
| Formal_Ent := Formal_Entity (Formal_Node, Actual_Ent); |
| |
| if Present (Formal_Ent) then |
| Find_Matching_Actual (Formal_Node, Actual_Ent); |
| Set_Instance_Of (Formal_Ent, Actual_Ent); |
| end if; |
| |
| Next_Non_Pragma (Formal_Node); |
| |
| else |
| -- No further formals to match, but the generic |
| -- part may contain inherited operation that are |
| -- not hidden in the enclosing instance. |
| |
| Next_Entity (Actual_Ent); |
| end if; |
| |
| end loop; |
| end; |
| |
| -- If the formal is not declared with a box, reanalyze it as |
| -- an instantiation, to verify the matching rules of 12.7. The |
| -- actual checks are performed after the generic associations |
| -- been analyzed. |
| |
| else |
| declare |
| I_Pack : constant Entity_Id := |
| Make_Defining_Identifier (Sloc (Actual), |
| Chars => New_Internal_Name ('P')); |
| |
| begin |
| Set_Is_Internal (I_Pack); |
| |
| Append_To (Decls, |
| Make_Package_Instantiation (Sloc (Actual), |
| Defining_Unit_Name => I_Pack, |
| Name => New_Occurrence_Of (Gen_Parent, Sloc (Actual)), |
| Generic_Associations => |
| Generic_Associations (Formal))); |
| end; |
| end if; |
| |
| return Decls; |
| end if; |
| end Instantiate_Formal_Package; |
| |
| ----------------------------------- |
| -- Instantiate_Formal_Subprogram -- |
| ----------------------------------- |
| |
| function Instantiate_Formal_Subprogram |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id) return Node_Id |
| is |
| Loc : Source_Ptr := Sloc (Instantiation_Node); |
| Formal_Sub : constant Entity_Id := |
| Defining_Unit_Name (Specification (Formal)); |
| Analyzed_S : constant Entity_Id := |
| Defining_Unit_Name (Specification (Analyzed_Formal)); |
| Decl_Node : Node_Id; |
| Nam : Node_Id; |
| New_Spec : Node_Id; |
| |
| function From_Parent_Scope (Subp : Entity_Id) return Boolean; |
| -- If the generic is a child unit, the parent has been installed |
| -- on the scope stack, but a default subprogram cannot resolve to |
| -- something on the parent because that parent is not really part |
| -- of the visible context (it is there to resolve explicit local |
| -- entities). If the default has resolved in this way, we remove |
| -- the entity from immediate visibility and analyze the node again |
| -- to emit an error message or find another visible candidate. |
| |
| procedure Valid_Actual_Subprogram (Act : Node_Id); |
| -- Perform legality check and raise exception on failure. |
| |
| ----------------------- |
| -- From_Parent_Scope -- |
| ----------------------- |
| |
| function From_Parent_Scope (Subp : Entity_Id) return Boolean is |
| Gen_Scope : Node_Id := Scope (Analyzed_S); |
| |
| begin |
| while Present (Gen_Scope) |
| and then Is_Child_Unit (Gen_Scope) |
| loop |
| if Scope (Subp) = Scope (Gen_Scope) then |
| return True; |
| end if; |
| |
| Gen_Scope := Scope (Gen_Scope); |
| end loop; |
| |
| return False; |
| end From_Parent_Scope; |
| |
| ----------------------------- |
| -- Valid_Actual_Subprogram -- |
| ----------------------------- |
| |
| procedure Valid_Actual_Subprogram (Act : Node_Id) is |
| Act_E : Entity_Id := Empty; |
| |
| begin |
| if Is_Entity_Name (Act) then |
| Act_E := Entity (Act); |
| elsif Nkind (Act) = N_Selected_Component |
| and then Is_Entity_Name (Selector_Name (Act)) |
| then |
| Act_E := Entity (Selector_Name (Act)); |
| end if; |
| |
| if (Present (Act_E) and then Is_Overloadable (Act_E)) |
| or else Nkind (Act) = N_Attribute_Reference |
| or else Nkind (Act) = N_Indexed_Component |
| or else Nkind (Act) = N_Character_Literal |
| or else Nkind (Act) = N_Explicit_Dereference |
| then |
| return; |
| end if; |
| |
| Error_Msg_NE |
| ("expect subprogram or entry name in instantiation of&", |
| Instantiation_Node, Formal_Sub); |
| Abandon_Instantiation (Instantiation_Node); |
| |
| end Valid_Actual_Subprogram; |
| |
| -- Start of processing for Instantiate_Formal_Subprogram |
| |
| begin |
| New_Spec := New_Copy_Tree (Specification (Formal)); |
| |
| -- Create new entity for the actual (New_Copy_Tree does not). |
| |
| Set_Defining_Unit_Name |
| (New_Spec, Make_Defining_Identifier (Loc, Chars (Formal_Sub))); |
| |
| -- Find entity of actual. If the actual is an attribute reference, it |
| -- cannot be resolved here (its formal is missing) but is handled |
| -- instead in Attribute_Renaming. If the actual is overloaded, it is |
| -- fully resolved subsequently, when the renaming declaration for the |
| -- formal is analyzed. If it is an explicit dereference, resolve the |
| -- prefix but not the actual itself, to prevent interpretation as a |
| -- call. |
| |
| if Present (Actual) then |
| Loc := Sloc (Actual); |
| Set_Sloc (New_Spec, Loc); |
| |
| if Nkind (Actual) = N_Operator_Symbol then |
| Find_Direct_Name (Actual); |
| |
| elsif Nkind (Actual) = N_Explicit_Dereference then |
| Analyze (Prefix (Actual)); |
| |
| elsif Nkind (Actual) /= N_Attribute_Reference then |
| Analyze (Actual); |
| end if; |
| |
| Valid_Actual_Subprogram (Actual); |
| Nam := Actual; |
| |
| elsif Present (Default_Name (Formal)) then |
| if Nkind (Default_Name (Formal)) /= N_Attribute_Reference |
| and then Nkind (Default_Name (Formal)) /= N_Selected_Component |
| and then Nkind (Default_Name (Formal)) /= N_Indexed_Component |
| and then Nkind (Default_Name (Formal)) /= N_Character_Literal |
| and then Present (Entity (Default_Name (Formal))) |
| then |
| Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc); |
| else |
| Nam := New_Copy (Default_Name (Formal)); |
| Set_Sloc (Nam, Loc); |
| end if; |
| |
| elsif Box_Present (Formal) then |
| |
| -- Actual is resolved at the point of instantiation. Create |
| -- an identifier or operator with the same name as the formal. |
| |
| if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then |
| Nam := Make_Operator_Symbol (Loc, |
| Chars => Chars (Formal_Sub), |
| Strval => No_String); |
| else |
| Nam := Make_Identifier (Loc, Chars (Formal_Sub)); |
| end if; |
| |
| else |
| Error_Msg_Sloc := Sloc (Scope (Analyzed_S)); |
| Error_Msg_NE |
| ("missing actual&", Instantiation_Node, Formal_Sub); |
| Error_Msg_NE |
| ("\in instantiation of & declared#", |
| Instantiation_Node, Scope (Analyzed_S)); |
| Abandon_Instantiation (Instantiation_Node); |
| end if; |
| |
| Decl_Node := |
| Make_Subprogram_Renaming_Declaration (Loc, |
| Specification => New_Spec, |
| Name => Nam); |
| |
| -- If we do not have an actual and the formal specified <> then |
| -- set to get proper default. |
| |
| if No (Actual) and then Box_Present (Formal) then |
| Set_From_Default (Decl_Node); |
| end if; |
| |
| -- Gather possible interpretations for the actual before analyzing the |
| -- instance. If overloaded, it will be resolved when analyzing the |
| -- renaming declaration. |
| |
| if Box_Present (Formal) |
| and then No (Actual) |
| then |
| Analyze (Nam); |
| |
| if Is_Child_Unit (Scope (Analyzed_S)) |
| and then Present (Entity (Nam)) |
| then |
| if not Is_Overloaded (Nam) then |
| |
| if From_Parent_Scope (Entity (Nam)) then |
| Set_Is_Immediately_Visible (Entity (Nam), False); |
| Set_Entity (Nam, Empty); |
| Set_Etype (Nam, Empty); |
| |
| Analyze (Nam); |
| |
| Set_Is_Immediately_Visible (Entity (Nam)); |
| end if; |
| |
| else |
| declare |
| I : Interp_Index; |
| It : Interp; |
| |
| begin |
| Get_First_Interp (Nam, I, It); |
| |
| while Present (It.Nam) loop |
| if From_Parent_Scope (It.Nam) then |
| Remove_Interp (I); |
| end if; |
| |
| Get_Next_Interp (I, It); |
| end loop; |
| end; |
| end if; |
| end if; |
| end if; |
| |
| -- The generic instantiation freezes the actual. This can only be |
| -- done once the actual is resolved, in the analysis of the renaming |
| -- declaration. To make the formal subprogram entity available, we set |
| -- Corresponding_Formal_Spec to point to the formal subprogram entity. |
| -- This is also needed in Analyze_Subprogram_Renaming for the processing |
| -- of formal abstract subprograms. |
| |
| Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S); |
| |
| -- We cannot analyze the renaming declaration, and thus find the |
| -- actual, until the all the actuals are assembled in the instance. |
| -- For subsequent checks of other actuals, indicate the node that |
| -- will hold the instance of this formal. |
| |
| Set_Instance_Of (Analyzed_S, Nam); |
| |
| if Nkind (Actual) = N_Selected_Component |
| and then Is_Task_Type (Etype (Prefix (Actual))) |
| and then not Is_Frozen (Etype (Prefix (Actual))) |
| then |
| -- The renaming declaration will create a body, which must appear |
| -- outside of the instantiation, We move the renaming declaration |
| -- out of the instance, and create an additional renaming inside, |
| -- to prevent freezing anomalies. |
| |
| declare |
| Anon_Id : constant Entity_Id := |
| Make_Defining_Identifier |
| (Loc, New_Internal_Name ('E')); |
| begin |
| Set_Defining_Unit_Name (New_Spec, Anon_Id); |
| Insert_Before (Instantiation_Node, Decl_Node); |
| Analyze (Decl_Node); |
| |
| -- Now create renaming within the instance |
| |
| Decl_Node := |
| Make_Subprogram_Renaming_Declaration (Loc, |
| Specification => New_Copy_Tree (New_Spec), |
| Name => New_Occurrence_Of (Anon_Id, Loc)); |
| |
| Set_Defining_Unit_Name (Specification (Decl_Node), |
| Make_Defining_Identifier (Loc, Chars (Formal_Sub))); |
| end; |
| end if; |
| |
| return Decl_Node; |
| end Instantiate_Formal_Subprogram; |
| |
| ------------------------ |
| -- Instantiate_Object -- |
| ------------------------ |
| |
| function Instantiate_Object |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id) return List_Id |
| is |
| Formal_Id : constant Entity_Id := Defining_Identifier (Formal); |
| Type_Id : constant Node_Id := Subtype_Mark (Formal); |
| Loc : constant Source_Ptr := Sloc (Actual); |
| Act_Assoc : constant Node_Id := Parent (Actual); |
| Orig_Ftyp : constant Entity_Id := |
| Etype (Defining_Identifier (Analyzed_Formal)); |
| List : constant List_Id := New_List; |
| Ftyp : Entity_Id; |
| Decl_Node : Node_Id; |
| Subt_Decl : Node_Id := Empty; |
| |
| begin |
| -- Sloc for error message on missing actual. |
| Error_Msg_Sloc := Sloc (Scope (Defining_Identifier (Analyzed_Formal))); |
| |
| if Get_Instance_Of (Formal_Id) /= Formal_Id then |
| Error_Msg_N ("duplicate instantiation of generic parameter", Actual); |
| end if; |
| |
| Set_Parent (List, Parent (Actual)); |
| |
| -- OUT present |
| |
| if Out_Present (Formal) then |
| |
| -- An IN OUT generic actual must be a name. The instantiation is |
| -- a renaming declaration. The actual is the name being renamed. |
| -- We use the actual directly, rather than a copy, because it is not |
| -- used further in the list of actuals, and because a copy or a use |
| -- of relocate_node is incorrect if the instance is nested within |
| -- a generic. In order to simplify ASIS searches, the Generic_Parent |
| -- field links the declaration to the generic association. |
| |
| if No (Actual) then |
| Error_Msg_NE |
| ("missing actual&", |
| Instantiation_Node, Formal_Id); |
| Error_Msg_NE |
| ("\in instantiation of & declared#", |
| Instantiation_Node, |
| Scope (Defining_Identifier (Analyzed_Formal))); |
| Abandon_Instantiation (Instantiation_Node); |
| end if; |
| |
| Decl_Node := |
| Make_Object_Renaming_Declaration (Loc, |
| Defining_Identifier => New_Copy (Formal_Id), |
| Subtype_Mark => New_Copy_Tree (Type_Id), |
| Name => Actual); |
| |
| Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc); |
| |
| -- The analysis of the actual may produce insert_action nodes, so |
| -- the declaration must have a context in which to attach them. |
| |
| Append (Decl_Node, List); |
| Analyze (Actual); |
| |
| -- This check is performed here because Analyze_Object_Renaming |
| -- will not check it when Comes_From_Source is False. Note |
| -- though that the check for the actual being the name of an |
| -- object will be performed in Analyze_Object_Renaming. |
| |
| if Is_Object_Reference (Actual) |
| and then Is_Dependent_Component_Of_Mutable_Object (Actual) |
| then |
| Error_Msg_N |
| ("illegal discriminant-dependent component for in out parameter", |
| Actual); |
| end if; |
| |
| -- The actual has to be resolved in order to check that it is |
| -- a variable (due to cases such as F(1), where F returns |
| -- access to an array, and for overloaded prefixes). |
| |
| Ftyp := |
| Get_Instance_Of (Etype (Defining_Identifier (Analyzed_Formal))); |
| |
| if Is_Private_Type (Ftyp) |
| and then not Is_Private_Type (Etype (Actual)) |
| and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual)) |
| or else Base_Type (Etype (Actual)) = Ftyp) |
| then |
| -- If the actual has the type of the full view of the formal, |
| -- or else a non-private subtype of the formal, then |
| -- the visibility of the formal type has changed. Add to the |
| -- actuals a subtype declaration that will force the exchange |
| -- of views in the body of the instance as well. |
| |
| Subt_Decl := |
| Make_Subtype_Declaration (Loc, |
| Defining_Identifier => |
| Make_Defining_Identifier (Loc, New_Internal_Name ('P')), |
| Subtype_Indication => New_Occurrence_Of (Ftyp, Loc)); |
| |
| Prepend (Subt_Decl, List); |
| |
| Append_Elmt (Full_View (Ftyp), Exchanged_Views); |
| Exchange_Declarations (Ftyp); |
| end if; |
| |
| Resolve (Actual, Ftyp); |
| |
| if not Is_Variable (Actual) or else Paren_Count (Actual) > 0 then |
| Error_Msg_NE |
| ("actual for& must be a variable", Actual, Formal_Id); |
| |
| elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then |
| Error_Msg_NE ( |
| "type of actual does not match type of&", Actual, Formal_Id); |
| |
| end if; |
| |
| Note_Possible_Modification (Actual); |
| |
| -- Check for instantiation of atomic/volatile actual for |
| -- non-atomic/volatile formal (RM C.6 (12)). |
| |
| if Is_Atomic_Object (Actual) |
| and then not Is_Atomic (Orig_Ftyp) |
| then |
| Error_Msg_N |
| ("cannot instantiate non-atomic formal object " & |
| "with atomic actual", Actual); |
| |
| elsif Is_Volatile_Object (Actual) |
| and then not Is_Volatile (Orig_Ftyp) |
| then |
| Error_Msg_N |
| ("cannot instantiate non-volatile formal object " & |
| "with volatile actual", Actual); |
| end if; |
| |
| -- OUT not present |
| |
| else |
| -- The instantiation of a generic formal in-parameter |
| -- is a constant declaration. The actual is the expression for |
| -- that declaration. |
| |
| if Present (Actual) then |
| |
| Decl_Node := Make_Object_Declaration (Loc, |
| Defining_Identifier => New_Copy (Formal_Id), |
| Constant_Present => True, |
| Object_Definition => New_Copy_Tree (Type_Id), |
| Expression => Actual); |
| |
| Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc); |
| |
| -- A generic formal object of a tagged type is defined |
| -- to be aliased so the new constant must also be treated |
| -- as aliased. |
| |
| if Is_Tagged_Type |
| (Etype (Defining_Identifier (Analyzed_Formal))) |
| then |
| Set_Aliased_Present (Decl_Node); |
| end if; |
| |
| Append (Decl_Node, List); |
| |
| -- No need to repeat (pre-)analysis of some expression nodes |
| -- already handled in Pre_Analyze_Actuals. |
| |
| if Nkind (Actual) /= N_Allocator then |
| Analyze (Actual); |
| end if; |
| |
| declare |
| Typ : constant Entity_Id := |
| Get_Instance_Of |
| (Etype (Defining_Identifier (Analyzed_Formal))); |
| |
| begin |
| Freeze_Before (Instantiation_Node, Typ); |
| |
| -- If the actual is an aggregate, perform name resolution |
| -- on its components (the analysis of an aggregate does not |
| -- do it) to capture local names that may be hidden if the |
| -- generic is a child unit. |
| |
| if Nkind (Actual) = N_Aggregate then |
| Pre_Analyze_And_Resolve (Actual, Typ); |
| end if; |
| end; |
| |
| elsif Present (Expression (Formal)) then |
| |
| -- Use default to construct declaration. |
| |
| Decl_Node := |
| Make_Object_Declaration (Sloc (Formal), |
| Defining_Identifier => New_Copy (Formal_Id), |
| Constant_Present => True, |
| Object_Definition => New_Copy (Type_Id), |
| Expression => New_Copy_Tree (Expression (Formal))); |
| |
| Append (Decl_Node, List); |
| Set_Analyzed (Expression (Decl_Node), False); |
| |
| else |
| Error_Msg_NE |
| ("missing actual&", |
| Instantiation_Node, Formal_Id); |
| Error_Msg_NE ("\in instantiation of & declared#", |
| Instantiation_Node, |
| Scope (Defining_Identifier (Analyzed_Formal))); |
| |
| if Is_Scalar_Type |
| (Etype (Defining_Identifier (Analyzed_Formal))) |
| then |
| -- Create dummy constant declaration so that instance can |
| -- be analyzed, to minimize cascaded visibility errors. |
| |
| Decl_Node := |
| Make_Object_Declaration (Loc, |
| Defining_Identifier => New_Copy (Formal_Id), |
| Constant_Present => True, |
| Object_Definition => New_Copy (Type_Id), |
| Expression => |
| Make_Attribute_Reference (Sloc (Formal_Id), |
| Attribute_Name => Name_First, |
| Prefix => New_Copy (Type_Id))); |
| |
| Append (Decl_Node, List); |
| |
| else |
| Abandon_Instantiation (Instantiation_Node); |
| end if; |
| end if; |
| |
| end if; |
| |
| return List; |
| end Instantiate_Object; |
| |
| ------------------------------ |
| -- Instantiate_Package_Body -- |
| ------------------------------ |
| |
| procedure Instantiate_Package_Body |
| (Body_Info : Pending_Body_Info; |
| Inlined_Body : Boolean := False) |
| is |
| Act_Decl : constant Node_Id := Body_Info.Act_Decl; |
| Inst_Node : constant Node_Id := Body_Info.Inst_Node; |
| Loc : constant Source_Ptr := Sloc (Inst_Node); |
| |
| Gen_Id : constant Node_Id := Name (Inst_Node); |
| Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); |
| Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit); |
| Act_Spec : constant Node_Id := Specification (Act_Decl); |
| Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec); |
| |
| Act_Body_Name : Node_Id; |
| Gen_Body : Node_Id; |
| Gen_Body_Id : Node_Id; |
| Act_Body : Node_Id; |
| Act_Body_Id : Entity_Id; |
| |
| Parent_Installed : Boolean := False; |
| Save_Style_Check : constant Boolean := Style_Check; |
| |
| begin |
| Gen_Body_Id := Corresponding_Body (Gen_Decl); |
| |
| -- The instance body may already have been processed, as the parent |
| -- of another instance that is inlined. (Load_Parent_Of_Generic). |
| |
| if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then |
| return; |
| end if; |
| |
| Expander_Mode_Save_And_Set (Body_Info.Expander_Status); |
| |
| if No (Gen_Body_Id) then |
| Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl)); |
| Gen_Body_Id := Corresponding_Body (Gen_Decl); |
| end if; |
| |
| -- Establish global variable for sloc adjustment and for error |
| -- recovery. |
| |
| Instantiation_Node := Inst_Node; |
| |
| if Present (Gen_Body_Id) then |
| Save_Env (Gen_Unit, Act_Decl_Id); |
| Style_Check := False; |
| Current_Sem_Unit := Body_Info.Current_Sem_Unit; |
| |
| Gen_Body := Unit_Declaration_Node (Gen_Body_Id); |
| |
| Create_Instantiation_Source |
| (Inst_Node, Gen_Body_Id, False, S_Adjustment); |
| |
| Act_Body := |
| Copy_Generic_Node |
| (Original_Node (Gen_Body), Empty, Instantiating => True); |
| |
| -- Build new name (possibly qualified) for body declaration |
| |
| Act_Body_Id := New_Copy (Act_Decl_Id); |
| |
| -- Some attributes of the spec entity are not inherited by the |
| -- body entity. |
| |
| Set_Handler_Records (Act_Body_Id, No_List); |
| |
| if Nkind (Defining_Unit_Name (Act_Spec)) = |
| N_Defining_Program_Unit_Name |
| then |
| Act_Body_Name := |
| Make_Defining_Program_Unit_Name (Loc, |
| Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))), |
| Defining_Identifier => Act_Body_Id); |
| else |
| Act_Body_Name := Act_Body_Id; |
| end if; |
| |
| Set_Defining_Unit_Name (Act_Body, Act_Body_Name); |
| |
| Set_Corresponding_Spec (Act_Body, Act_Decl_Id); |
| Check_Generic_Actuals (Act_Decl_Id, False); |
| |
| -- If it is a child unit, make the parent instance (which is an |
| -- instance of the parent of the generic) visible. The parent |
| -- instance is the prefix of the name of the generic unit. |
| |
| if Ekind (Scope (Gen_Unit)) = E_Generic_Package |
| and then Nkind (Gen_Id) = N_Expanded_Name |
| then |
| Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True); |
| Parent_Installed := True; |
| |
| elsif Is_Child_Unit (Gen_Unit) then |
| Install_Parent (Scope (Gen_Unit), In_Body => True); |
| Parent_Installed := True; |
| end if; |
| |
| -- If the instantiation is a library unit, and this is the main |
| -- unit, then build the resulting compilation unit nodes for the |
| -- instance. If this is a compilation unit but it is not the main |
| -- unit, then it is the body of a unit in the context, that is being |
| -- compiled because it is encloses some inlined unit or another |
| -- generic unit being instantiated. In that case, this body is not |
| -- part of the current compilation, and is not attached to the tree, |
| -- but its parent must be set for analysis. |
| |
| if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then |
| |
| -- Replace instance node with body of instance, and create |
| -- new node for corresponding instance declaration. |
| |
| Build_Instance_Compilation_Unit_Nodes |
| (Inst_Node, Act_Body, Act_Decl); |
| Analyze (Inst_Node); |
| |
| if Parent (Inst_Node) = Cunit (Main_Unit) then |
| |
| -- If the instance is a child unit itself, then set the |
| -- scope of the expanded body to be the parent of the |
| -- instantiation (ensuring that the fully qualified name |
| -- will be generated for the elaboration subprogram). |
| |
| if Nkind (Defining_Unit_Name (Act_Spec)) = |
| N_Defining_Program_Unit_Name |
| then |
| Set_Scope |
| (Defining_Entity (Inst_Node), Scope (Act_Decl_Id)); |
| end if; |
| end if; |
| |
| -- Case where instantiation is not a library unit |
| |
| else |
| -- If this is an early instantiation, i.e. appears textually |
| -- before the corresponding body and must be elaborated first, |
| -- indicate that the body instance is to be delayed. |
| |
| Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl); |
| |
| -- Now analyze the body. We turn off all checks if this is |
| -- an internal unit, since there is no reason to have checks |
| -- on for any predefined run-time library code. All such |
| -- code is designed to be compiled with checks off. |
| |
| -- Note that we do NOT apply this criterion to children of |
| -- GNAT (or on VMS, children of DEC). The latter units must |
| -- suppress checks explicitly if this is needed. |
| |
| if Is_Predefined_File_Name |
| (Unit_File_Name (Get_Source_Unit (Gen_Decl))) |
| then |
| Analyze (Act_Body, Suppress => All_Checks); |
| else |
| Analyze (Act_Body); |
| end if; |
| end if; |
| |
| if not Generic_Separately_Compiled (Gen_Unit) then |
| Inherit_Context (Gen_Body, Inst_Node); |
| end if; |
| |
| -- Remove the parent instances if they have been placed on the |
| -- scope stack to compile the body. |
| |
| if Parent_Installed then |
| Remove_Parent (In_Body => True); |
| end if; |
| |
| Restore_Private_Views (Act_Decl_Id); |
| |
| -- Remove the current unit from visibility if this is an instance |
| -- that is not elaborated on the fly for inlining purposes. |
| |
| if not Inlined_Body then |
| Set_Is_Immediately_Visible (Act_Decl_Id, False); |
| end if; |
| |
| Restore_Env; |
| Style_Check := Save_Style_Check; |
| |
| -- If we have no body, and the unit requires a body, then complain. |
| -- This complaint is suppressed if we have detected other errors |
| -- (since a common reason for missing the body is that it had errors). |
| |
| elsif Unit_Requires_Body (Gen_Unit) then |
| if Serious_Errors_Detected = 0 then |
| Error_Msg_NE |
| ("cannot find body of generic package &", Inst_Node, Gen_Unit); |
| |
| -- Don't attempt to perform any cleanup actions if some other |
| -- error was aready detected, since this can cause blowups. |
| |
| else |
| return; |
| end if; |
| |
| -- Case of package that does not need a body |
| |
| else |
| -- If the instantiation of the declaration is a library unit, |
| -- rewrite the original package instantiation as a package |
| -- declaration in the compilation unit node. |
| |
| if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then |
| Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node)); |
| Rewrite (Inst_Node, Act_Decl); |
| |
| -- Generate elaboration entity, in case spec has elaboration |
| -- code. This cannot be done when the instance is analyzed, |
| -- because it is not known yet whether the body exists. |
| |
| Set_Elaboration_Entity_Required (Act_Decl_Id, False); |
| Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id); |
| |
| -- If the instantiation is not a library unit, then append the |
| -- declaration to the list of implicitly generated entities. |
| -- unless it is already a list member which means that it was |
| -- already processed |
| |
| elsif not Is_List_Member (Act_Decl) then |
| Mark_Rewrite_Insertion (Act_Decl); |
| Insert_Before (Inst_Node, Act_Decl); |
| end if; |
| end if; |
| |
| Expander_Mode_Restore; |
| end Instantiate_Package_Body; |
| |
| --------------------------------- |
| -- Instantiate_Subprogram_Body -- |
| --------------------------------- |
| |
| procedure Instantiate_Subprogram_Body |
| (Body_Info : Pending_Body_Info) |
| is |
| Act_Decl : constant Node_Id := Body_Info.Act_Decl; |
| Inst_Node : constant Node_Id := Body_Info.Inst_Node; |
| Loc : constant Source_Ptr := Sloc (Inst_Node); |
| Gen_Id : constant Node_Id := Name (Inst_Node); |
| Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); |
| Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit); |
| Anon_Id : constant Entity_Id := |
| Defining_Unit_Name (Specification (Act_Decl)); |
| Pack_Id : constant Entity_Id := |
| Defining_Unit_Name (Parent (Act_Decl)); |
| Decls : List_Id; |
| Gen_Body : Node_Id; |
| Gen_Body_Id : Node_Id; |
| Act_Body : Node_Id; |
| Act_Body_Id : Entity_Id; |
| Pack_Body : Node_Id; |
| Prev_Formal : Entity_Id; |
| Ret_Expr : Node_Id; |
| Unit_Renaming : Node_Id; |
| |
| Parent_Installed : Boolean := False; |
| Save_Style_Check : constant Boolean := Style_Check; |
| |
| begin |
| Gen_Body_Id := Corresponding_Body (Gen_Decl); |
| |
| Expander_Mode_Save_And_Set (Body_Info.Expander_Status); |
| |
| if No (Gen_Body_Id) then |
| Load_Parent_Of_Generic (Inst_Node, Specification (Gen_Decl)); |
| Gen_Body_Id := Corresponding_Body (Gen_Decl); |
| end if; |
| |
| Instantiation_Node := Inst_Node; |
| |
| if Present (Gen_Body_Id) then |
| Gen_Body := Unit_Declaration_Node (Gen_Body_Id); |
| |
| if Nkind (Gen_Body) = N_Subprogram_Body_Stub then |
| |
| -- Either body is not present, or context is non-expanding, as |
| -- when compiling a subunit. Mark the instance as completed, and |
| -- diagnose a missing body when needed. |
| |
| if Expander_Active |
| and then Operating_Mode = Generate_Code |
| then |
| Error_Msg_N |
| ("missing proper body for instantiation", Gen_Body); |
| end if; |
| |
| Set_Has_Completion (Anon_Id); |
| return; |
| end if; |
| |
| Save_Env (Gen_Unit, Anon_Id); |
| Style_Check := False; |
| Current_Sem_Unit := Body_Info.Current_Sem_Unit; |
| Create_Instantiation_Source |
| (Inst_Node, |
| Gen_Body_Id, |
| False, |
| S_Adjustment); |
| |
| Act_Body := |
| Copy_Generic_Node |
| (Original_Node (Gen_Body), Empty, Instantiating => True); |
| Act_Body_Id := Defining_Entity (Act_Body); |
| Set_Chars (Act_Body_Id, Chars (Anon_Id)); |
| Set_Sloc (Act_Body_Id, Sloc (Defining_Entity (Inst_Node))); |
| Set_Corresponding_Spec (Act_Body, Anon_Id); |
| Set_Has_Completion (Anon_Id); |
| Check_Generic_Actuals (Pack_Id, False); |
| |
| -- If it is a child unit, make the parent instance (which is an |
| -- instance of the parent of the generic) visible. The parent |
| -- instance is the prefix of the name of the generic unit. |
| |
| if Ekind (Scope (Gen_Unit)) = E_Generic_Package |
| and then Nkind (Gen_Id) = N_Expanded_Name |
| then |
| Install_Parent (Entity (Prefix (Gen_Id)), In_Body => True); |
| Parent_Installed := True; |
| |
| elsif Is_Child_Unit (Gen_Unit) then |
| Install_Parent (Scope (Gen_Unit), In_Body => True); |
| Parent_Installed := True; |
| end if; |
| |
| -- Inside its body, a reference to the generic unit is a reference |
| -- to the instance. The corresponding renaming is the first |
| -- declaration in the body. |
| |
| Unit_Renaming := |
| Make_Subprogram_Renaming_Declaration (Loc, |
| Specification => |
| Copy_Generic_Node ( |
| Specification (Original_Node (Gen_Body)), |
| Empty, |
| Instantiating => True), |
| Name => New_Occurrence_Of (Anon_Id, Loc)); |
| |
| -- If there is a formal subprogram with the same name as the |
| -- unit itself, do not add this renaming declaration. This is |
| -- a temporary fix for one ACVC test. ??? |
| |
| Prev_Formal := First_Entity (Pack_Id); |
| while Present (Prev_Formal) loop |
| if Chars (Prev_Formal) = Chars (Gen_Unit) |
| and then Is_Overloadable (Prev_Formal) |
| then |
| exit; |
| end if; |
| |
| Next_Entity (Prev_Formal); |
| end loop; |
| |
| if Present (Prev_Formal) then |
| Decls := New_List (Act_Body); |
| else |
| Decls := New_List (Unit_Renaming, Act_Body); |
| end if; |
| |
| -- The subprogram body is placed in the body of a dummy package |
| -- body, whose spec contains the subprogram declaration as well |
| -- as the renaming declarations for the generic parameters. |
| |
| Pack_Body := Make_Package_Body (Loc, |
| Defining_Unit_Name => New_Copy (Pack_Id), |
| Declarations => Decls); |
| |
| Set_Corresponding_Spec (Pack_Body, Pack_Id); |
| |
| -- If the instantiation is a library unit, then build resulting |
| -- compilation unit nodes for the instance. The declaration of |
| -- the enclosing package is the grandparent of the subprogram |
| -- declaration. First replace the instantiation node as the unit |
| -- of the corresponding compilation. |
| |
| if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then |
| if Parent (Inst_Node) = Cunit (Main_Unit) then |
| Set_Unit (Parent (Inst_Node), Inst_Node); |
| Build_Instance_Compilation_Unit_Nodes |
| (Inst_Node, Pack_Body, Parent (Parent (Act_Decl))); |
| Analyze (Inst_Node); |
| else |
| Set_Parent (Pack_Body, Parent (Inst_Node)); |
| Analyze (Pack_Body); |
| end if; |
| |
| else |
| Insert_Before (Inst_Node, Pack_Body); |
| Mark_Rewrite_Insertion (Pack_Body); |
| Analyze (Pack_Body); |
| |
| if Expander_Active then |
| Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id); |
| end if; |
| end if; |
| |
| if not Generic_Separately_Compiled (Gen_Unit) then |
| Inherit_Context (Gen_Body, Inst_Node); |
| end if; |
| |
| Restore_Private_Views (Pack_Id, False); |
| |
| if Parent_Installed then |
| Remove_Parent (In_Body => True); |
| end if; |
| |
| Restore_Env; |
| Style_Check := Save_Style_Check; |
| |
| -- Body not found. Error was emitted already. If there were no |
| -- previous errors, this may be an instance whose scope is a premature |
| -- instance. In that case we must insure that the (legal) program does |
| -- raise program error if executed. We generate a subprogram body for |
| -- this purpose. See DEC ac30vso. |
| |
| elsif Serious_Errors_Detected = 0 |
| and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit |
| then |
| if Ekind (Anon_Id) = E_Procedure then |
| Act_Body := |
| Make_Subprogram_Body (Loc, |
| Specification => |
| Make_Procedure_Specification (Loc, |
| Defining_Unit_Name => New_Copy (Anon_Id), |
| Parameter_Specifications => |
| New_Copy_List |
| (Parameter_Specifications (Parent (Anon_Id)))), |
| |
| Declarations => Empty_List, |
| Handled_Statement_Sequence => |
| Make_Handled_Sequence_Of_Statements (Loc, |
| Statements => |
| New_List ( |
| Make_Raise_Program_Error (Loc, |
| Reason => |
| PE_Access_Before_Elaboration)))); |
| |
| else |
| Ret_Expr := |
| Make_Raise_Program_Error (Loc, |
| Reason => PE_Access_Before_Elaboration); |
| |
| Set_Etype (Ret_Expr, (Etype (Anon_Id))); |
| Set_Analyzed (Ret_Expr); |
| |
| Act_Body := |
| Make_Subprogram_Body (Loc, |
| Specification => |
| Make_Function_Specification (Loc, |
| Defining_Unit_Name => New_Copy (Anon_Id), |
| Parameter_Specifications => |
| New_Copy_List |
| (Parameter_Specifications (Parent (Anon_Id))), |
| Subtype_Mark => |
| New_Occurrence_Of (Etype (Anon_Id), Loc)), |
| |
| Declarations => Empty_List, |
| Handled_Statement_Sequence => |
| Make_Handled_Sequence_Of_Statements (Loc, |
| Statements => |
| New_List (Make_Return_Statement (Loc, Ret_Expr)))); |
| end if; |
| |
| Pack_Body := Make_Package_Body (Loc, |
| Defining_Unit_Name => New_Copy (Pack_Id), |
| Declarations => New_List (Act_Body)); |
| |
| Insert_After (Inst_Node, Pack_Body); |
| Set_Corresponding_Spec (Pack_Body, Pack_Id); |
| Analyze (Pack_Body); |
| end if; |
| |
| Expander_Mode_Restore; |
| end Instantiate_Subprogram_Body; |
| |
| ---------------------- |
| -- Instantiate_Type -- |
| ---------------------- |
| |
| function Instantiate_Type |
| (Formal : Node_Id; |
| Actual : Node_Id; |
| Analyzed_Formal : Node_Id; |
| Actual_Decls : List_Id) return Node_Id |
| is |
| Loc : constant Source_Ptr := Sloc (Actual); |
| Gen_T : constant Entity_Id := Defining_Identifier (Formal); |
| A_Gen_T : constant Entity_Id := Defining_Identifier (Analyzed_Formal); |
| Ancestor : Entity_Id := Empty; |
| Def : constant Node_Id := Formal_Type_Definition (Formal); |
| Act_T : Entity_Id; |
| Decl_Node : Node_Id; |
| |
| procedure Validate_Array_Type_Instance; |
| procedure Validate_Access_Subprogram_Instance; |
| procedure Validate_Access_Type_Instance; |
| procedure Validate_Derived_Type_Instance; |
| procedure Validate_Private_Type_Instance; |
| -- These procedures perform validation tests for the named case |
| |
| function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean; |
| -- Check that base types are the same and that the subtypes match |
| -- statically. Used in several of the above. |
| |
| -------------------- |
| -- Subtypes_Match -- |
| -------------------- |
| |
| function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is |
| T : constant Entity_Id := Get_Instance_Of (Gen_T); |
| |
| begin |
| return (Base_Type (T) = Base_Type (Act_T) |
| -- why is the and then commented out here??? |
| -- and then Is_Constrained (T) = Is_Constrained (Act_T) |
| and then Subtypes_Statically_Match (T, Act_T)) |
| |
| or else (Is_Class_Wide_Type (Gen_T) |
| and then Is_Class_Wide_Type (Act_T) |
| and then |
| Subtypes_Match ( |
| Get_Instance_Of (Root_Type (Gen_T)), |
| Root_Type (Act_T))); |
| end Subtypes_Match; |
| |
| ----------------------------------------- |
| -- Validate_Access_Subprogram_Instance -- |
| ----------------------------------------- |
| |
| procedure Validate_Access_Subprogram_Instance is |
| begin |
| if not Is_Access_Type (Act_T) |
| or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type |
| then |
| Error_Msg_NE |
| ("expect access type in instantiation of &", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| Check_Mode_Conformant |
| (Designated_Type (Act_T), |
| Designated_Type (A_Gen_T), |
| Actual, |
| Get_Inst => True); |
| |
| if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then |
| if Ekind (A_Gen_T) = E_Access_Subprogram_Type then |
| Error_Msg_NE |
| ("protected access type not allowed for formal &", |
| Actual, Gen_T); |
| end if; |
| |
| elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then |
| Error_Msg_NE |
| ("expect protected access type for formal &", |
| Actual, Gen_T); |
| end if; |
| end Validate_Access_Subprogram_Instance; |
| |
| ----------------------------------- |
| -- Validate_Access_Type_Instance -- |
| ----------------------------------- |
| |
| procedure Validate_Access_Type_Instance is |
| Desig_Type : constant Entity_Id := |
| Find_Actual_Type |
| (Designated_Type (A_Gen_T), Scope (A_Gen_T)); |
| |
| begin |
| if not Is_Access_Type (Act_T) then |
| Error_Msg_NE |
| ("expect access type in instantiation of &", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| if Is_Access_Constant (A_Gen_T) then |
| if not Is_Access_Constant (Act_T) then |
| Error_Msg_N |
| ("actual type must be access-to-constant type", Actual); |
| Abandon_Instantiation (Actual); |
| end if; |
| else |
| if Is_Access_Constant (Act_T) then |
| Error_Msg_N |
| ("actual type must be access-to-variable type", Actual); |
| Abandon_Instantiation (Actual); |
| |
| elsif Ekind (A_Gen_T) = E_General_Access_Type |
| and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type |
| then |
| Error_Msg_N ("actual must be general access type!", Actual); |
| Error_Msg_NE ("add ALL to }!", Actual, Act_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| end if; |
| |
| -- The designated subtypes, that is to say the subtypes introduced |
| -- by an access type declaration (and not by a subtype declaration) |
| -- must match. |
| |
| if not Subtypes_Match |
| (Desig_Type, Designated_Type (Base_Type (Act_T))) |
| then |
| Error_Msg_NE |
| ("designated type of actual does not match that of formal &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| elsif Is_Access_Type (Designated_Type (Act_T)) |
| and then Is_Constrained (Designated_Type (Designated_Type (Act_T))) |
| /= |
| Is_Constrained (Designated_Type (Desig_Type)) |
| then |
| Error_Msg_NE |
| ("designated type of actual does not match that of formal &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| end Validate_Access_Type_Instance; |
| |
| ---------------------------------- |
| -- Validate_Array_Type_Instance -- |
| ---------------------------------- |
| |
| procedure Validate_Array_Type_Instance is |
| I1 : Node_Id; |
| I2 : Node_Id; |
| T2 : Entity_Id; |
| |
| function Formal_Dimensions return Int; |
| -- Count number of dimensions in array type formal |
| |
| ----------------------- |
| -- Formal_Dimensions -- |
| ----------------------- |
| |
| function Formal_Dimensions return Int is |
| Num : Int := 0; |
| Index : Node_Id; |
| |
| begin |
| if Nkind (Def) = N_Constrained_Array_Definition then |
| Index := First (Discrete_Subtype_Definitions (Def)); |
| else |
| Index := First (Subtype_Marks (Def)); |
| end if; |
| |
| while Present (Index) loop |
| Num := Num + 1; |
| Next_Index (Index); |
| end loop; |
| |
| return Num; |
| end Formal_Dimensions; |
| |
| -- Start of processing for Validate_Array_Type_Instance |
| |
| begin |
| if not Is_Array_Type (Act_T) then |
| Error_Msg_NE |
| ("expect array type in instantiation of &", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| elsif Nkind (Def) = N_Constrained_Array_Definition then |
| if not (Is_Constrained (Act_T)) then |
| Error_Msg_NE |
| ("expect constrained array in instantiation of &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| else |
| if Is_Constrained (Act_T) then |
| Error_Msg_NE |
| ("expect unconstrained array in instantiation of &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| end if; |
| |
| if Formal_Dimensions /= Number_Dimensions (Act_T) then |
| Error_Msg_NE |
| ("dimensions of actual do not match formal &", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| I1 := First_Index (A_Gen_T); |
| I2 := First_Index (Act_T); |
| for J in 1 .. Formal_Dimensions loop |
| |
| -- If the indices of the actual were given by a subtype_mark, |
| -- the index was transformed into a range attribute. Retrieve |
| -- the original type mark for checking. |
| |
| if Is_Entity_Name (Original_Node (I2)) then |
| T2 := Entity (Original_Node (I2)); |
| else |
| T2 := Etype (I2); |
| end if; |
| |
| if not Subtypes_Match |
| (Find_Actual_Type (Etype (I1), Scope (A_Gen_T)), T2) |
| then |
| Error_Msg_NE |
| ("index types of actual do not match those of formal &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| Next_Index (I1); |
| Next_Index (I2); |
| end loop; |
| |
| if not Subtypes_Match ( |
| Find_Actual_Type (Component_Type (A_Gen_T), Scope (A_Gen_T)), |
| Component_Type (Act_T)) |
| then |
| Error_Msg_NE |
| ("component subtype of actual does not match that of formal &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| if Has_Aliased_Components (A_Gen_T) |
| and then not Has_Aliased_Components (Act_T) |
| then |
| Error_Msg_NE |
| ("actual must have aliased components to match formal type &", |
| Actual, Gen_T); |
| end if; |
| |
| end Validate_Array_Type_Instance; |
| |
| ------------------------------------ |
| -- Validate_Derived_Type_Instance -- |
| ------------------------------------ |
| |
| procedure Validate_Derived_Type_Instance is |
| Actual_Discr : Entity_Id; |
| Ancestor_Discr : Entity_Id; |
| |
| begin |
| -- If the parent type in the generic declaration is itself |
| -- a previous formal type, then it is local to the generic |
| -- and absent from the analyzed generic definition. In that |
| -- case the ancestor is the instance of the formal (which must |
| -- have been instantiated previously), unless the ancestor is |
| -- itself a formal derived type. In this latter case (which is the |
| -- subject of Corrigendum 8652/0038 (AI-202) the ancestor of the |
| -- formals is the ancestor of its parent. Otherwise, the analyzed |
| -- generic carries the parent type. If the parent type is defined |
| -- in a previous formal package, then the scope of that formal |
| -- package is that of the generic type itself, and it has already |
| -- been mapped into the corresponding type in the actual package. |
| |
| -- Common case: parent type defined outside of the generic |
| |
| if Is_Entity_Name (Subtype_Mark (Def)) |
| and then Present (Entity (Subtype_Mark (Def))) |
| then |
| Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def))); |
| |
| -- Check whether parent is defined in a previous formal package |
| |
| elsif |
| Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T) |
| then |
| Ancestor := |
| Get_Instance_Of (Base_Type (Etype (A_Gen_T))); |
| |
| -- The type may be a local derivation, or a type extension of |
| -- a previous formal, or of a formal of a parent package. |
| |
| elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T)) |
| or else |
| Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private |
| then |
| -- Check whether the parent is another derived formal type |
| -- in the same generic unit. |
| |
| if Etype (A_Gen_T) /= A_Gen_T |
| and then Is_Generic_Type (Etype (A_Gen_T)) |
| and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T) |
| and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T) |
| then |
| -- Locate ancestor of parent from the subtype declaration |
| -- created for the actual. |
| |
| declare |
| Decl : Node_Id; |
| |
| begin |
| Decl := First (Actual_Decls); |
| while Present (Decl) loop |
| if Nkind (Decl) = N_Subtype_Declaration |
| and then Chars (Defining_Identifier (Decl)) = |
| Chars (Etype (A_Gen_T)) |
| then |
| Ancestor := Generic_Parent_Type (Decl); |
| exit; |
| else |
| Next (Decl); |
| end if; |
| end loop; |
| end; |
| |
| pragma Assert (Present (Ancestor)); |
| |
| else |
| Ancestor := |
| Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T))); |
| end if; |
| |
| else |
| Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T))); |
| end if; |
| |
| if not Is_Ancestor (Base_Type (Ancestor), Act_T) then |
| Error_Msg_NE |
| ("expect type derived from & in instantiation", |
| Actual, First_Subtype (Ancestor)); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| -- Perform atomic/volatile checks (RM C.6(12)) |
| |
| if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then |
| Error_Msg_N |
| ("cannot have atomic actual type for non-atomic formal type", |
| Actual); |
| |
| elsif Is_Volatile (Act_T) |
| and then not Is_Volatile (Ancestor) |
| and then Is_By_Reference_Type (Ancestor) |
| then |
| Error_Msg_N |
| ("cannot have volatile actual type for non-volatile formal type", |
| Actual); |
| end if; |
| |
| -- It should not be necessary to check for unknown discriminants |
| -- on Formal, but for some reason Has_Unknown_Discriminants is |
| -- false for A_Gen_T, so Is_Indefinite_Subtype incorrectly |
| -- returns False. This needs fixing. ??? |
| |
| if not Is_Indefinite_Subtype (A_Gen_T) |
| and then not Unknown_Discriminants_Present (Formal) |
| and then Is_Indefinite_Subtype (Act_T) |
| then |
| Error_Msg_N |
| ("actual subtype must be constrained", Actual); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| if not Unknown_Discriminants_Present (Formal) then |
| if Is_Constrained (Ancestor) then |
| if not Is_Constrained (Act_T) then |
| Error_Msg_N |
| ("actual subtype must be constrained", Actual); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| -- Ancestor is unconstrained |
| |
| elsif Is_Constrained (Act_T) then |
| if Ekind (Ancestor) = E_Access_Type |
| or else Is_Composite_Type (Ancestor) |
| then |
| Error_Msg_N |
| ("actual subtype must be unconstrained", Actual); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| -- A class-wide type is only allowed if the formal has |
| -- unknown discriminants. |
| |
| elsif Is_Class_Wide_Type (Act_T) |
| and then not Has_Unknown_Discriminants (Ancestor) |
| then |
| Error_Msg_NE |
| ("actual for & cannot be a class-wide type", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| -- Otherwise, the formal and actual shall have the same |
| -- number of discriminants and each discriminant of the |
| -- actual must correspond to a discriminant of the formal. |
| |
| elsif Has_Discriminants (Act_T) |
| and then not Has_Unknown_Discriminants (Act_T) |
| and then Has_Discriminants (Ancestor) |
| then |
| Actual_Discr := First_Discriminant (Act_T); |
| Ancestor_Discr := First_Discriminant (Ancestor); |
| while Present (Actual_Discr) |
| and then Present (Ancestor_Discr) |
| loop |
| if Base_Type (Act_T) /= Base_Type (Ancestor) and then |
| not Present (Corresponding_Discriminant (Actual_Discr)) |
| then |
| Error_Msg_NE |
| ("discriminant & does not correspond " & |
| "to ancestor discriminant", Actual, Actual_Discr); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| Next_Discriminant (Actual_Discr); |
| Next_Discriminant (Ancestor_Discr); |
| end loop; |
| |
| if Present (Actual_Discr) or else Present (Ancestor_Discr) then |
| Error_Msg_NE |
| ("actual for & must have same number of discriminants", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| -- This case should be caught by the earlier check for |
| -- for constrainedness, but the check here is added for |
| -- completeness. |
| |
| elsif Has_Discriminants (Act_T) |
| and then not Has_Unknown_Discriminants (Act_T) |
| then |
| Error_Msg_NE |
| ("actual for & must not have discriminants", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| elsif Has_Discriminants (Ancestor) then |
| Error_Msg_NE |
| ("actual for & must have known discriminants", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| if not Subtypes_Statically_Compatible (Act_T, Ancestor) then |
| Error_Msg_N |
| ("constraint on actual is incompatible with formal", Actual); |
| Abandon_Instantiation (Actual); |
| end if; |
| end if; |
| end Validate_Derived_Type_Instance; |
| |
| ------------------------------------ |
| -- Validate_Private_Type_Instance -- |
| ------------------------------------ |
| |
| procedure Validate_Private_Type_Instance is |
| Formal_Discr : Entity_Id; |
| Actual_Discr : Entity_Id; |
| Formal_Subt : Entity_Id; |
| |
| begin |
| if Is_Limited_Type (Act_T) |
| and then not Is_Limited_Type (A_Gen_T) |
| then |
| Error_Msg_NE |
| ("actual for non-limited & cannot be a limited type", Actual, |
| Gen_T); |
| Explain_Limited_Type (Act_T, Actual); |
| Abandon_Instantiation (Actual); |
| |
| elsif Is_Indefinite_Subtype (Act_T) |
| and then not Is_Indefinite_Subtype (A_Gen_T) |
| and then Ada_Version >= Ada_95 |
| then |
| Error_Msg_NE |
| ("actual for & must be a definite subtype", Actual, Gen_T); |
| |
| elsif not Is_Tagged_Type (Act_T) |
| and then Is_Tagged_Type (A_Gen_T) |
| then |
| Error_Msg_NE |
| ("actual for & must be a tagged type", Actual, Gen_T); |
| |
| elsif Has_Discriminants (A_Gen_T) then |
| if not Has_Discriminants (Act_T) then |
| Error_Msg_NE |
| ("actual for & must have discriminants", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| elsif Is_Constrained (Act_T) then |
| Error_Msg_NE |
| ("actual for & must be unconstrained", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| else |
| Formal_Discr := First_Discriminant (A_Gen_T); |
| Actual_Discr := First_Discriminant (Act_T); |
| while Formal_Discr /= Empty loop |
| if Actual_Discr = Empty then |
| Error_Msg_NE |
| ("discriminants on actual do not match formal", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| Formal_Subt := Get_Instance_Of (Etype (Formal_Discr)); |
| |
| -- access discriminants match if designated types do. |
| |
| if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type |
| and then (Ekind (Base_Type (Etype (Actual_Discr)))) |
| = E_Anonymous_Access_Type |
| and then Get_Instance_Of ( |
| Designated_Type (Base_Type (Formal_Subt))) |
| = Designated_Type (Base_Type (Etype (Actual_Discr))) |
| then |
| null; |
| |
| elsif Base_Type (Formal_Subt) /= |
| Base_Type (Etype (Actual_Discr)) |
| then |
| Error_Msg_NE |
| ("types of actual discriminants must match formal", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| elsif not Subtypes_Statically_Match |
| (Formal_Subt, Etype (Actual_Discr)) |
| and then Ada_Version >= Ada_95 |
| then |
| Error_Msg_NE |
| ("subtypes of actual discriminants must match formal", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| Next_Discriminant (Formal_Discr); |
| Next_Discriminant (Actual_Discr); |
| end loop; |
| |
| if Actual_Discr /= Empty then |
| Error_Msg_NE |
| ("discriminants on actual do not match formal", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| end if; |
| |
| end if; |
| |
| Ancestor := Gen_T; |
| end Validate_Private_Type_Instance; |
| |
| -- Start of processing for Instantiate_Type |
| |
| begin |
| if Get_Instance_Of (A_Gen_T) /= A_Gen_T then |
| Error_Msg_N ("duplicate instantiation of generic type", Actual); |
| return Error; |
| |
| elsif not Is_Entity_Name (Actual) |
| or else not Is_Type (Entity (Actual)) |
| then |
| Error_Msg_NE |
| ("expect valid subtype mark to instantiate &", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| |
| else |
| Act_T := Entity (Actual); |
| |
| -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed |
| -- as a generic actual parameter if the corresponding formal type |
| -- does not have a known_discriminant_part, or is a formal derived |
| -- type that is an Unchecked_Union type. |
| |
| if Is_Unchecked_Union (Base_Type (Act_T)) then |
| if not Has_Discriminants (A_Gen_T) |
| or else |
| (Is_Derived_Type (A_Gen_T) |
| and then |
| Is_Unchecked_Union (A_Gen_T)) |
| then |
| null; |
| else |
| Error_Msg_N ("Unchecked_Union cannot be the actual for a" & |
| " discriminated formal type", Act_T); |
| |
| end if; |
| end if; |
| |
| -- Deal with fixed/floating restrictions |
| |
| if Is_Floating_Point_Type (Act_T) then |
| Check_Restriction (No_Floating_Point, Actual); |
| elsif Is_Fixed_Point_Type (Act_T) then |
| Check_Restriction (No_Fixed_Point, Actual); |
| end if; |
| |
| -- Deal with error of using incomplete type as generic actual |
| |
| if Ekind (Act_T) = E_Incomplete_Type then |
| if No (Underlying_Type (Act_T)) then |
| Error_Msg_N ("premature use of incomplete type", Actual); |
| Abandon_Instantiation (Actual); |
| else |
| Act_T := Full_View (Act_T); |
| Set_Entity (Actual, Act_T); |
| |
| if Has_Private_Component (Act_T) then |
| Error_Msg_N |
| ("premature use of type with private component", Actual); |
| end if; |
| end if; |
| |
| -- Deal with error of premature use of private type as generic actual |
| |
| elsif Is_Private_Type (Act_T) |
| and then Is_Private_Type (Base_Type (Act_T)) |
| and then not Is_Generic_Type (Act_T) |
| and then not Is_Derived_Type (Act_T) |
| and then No (Full_View (Root_Type (Act_T))) |
| then |
| Error_Msg_N ("premature use of private type", Actual); |
| |
| elsif Has_Private_Component (Act_T) then |
| Error_Msg_N |
| ("premature use of type with private component", Actual); |
| end if; |
| |
| Set_Instance_Of (A_Gen_T, Act_T); |
| |
| -- If the type is generic, the class-wide type may also be used |
| |
| if Is_Tagged_Type (A_Gen_T) |
| and then Is_Tagged_Type (Act_T) |
| and then not Is_Class_Wide_Type (A_Gen_T) |
| then |
| Set_Instance_Of (Class_Wide_Type (A_Gen_T), |
| Class_Wide_Type (Act_T)); |
| end if; |
| |
| if not Is_Abstract (A_Gen_T) |
| and then Is_Abstract (Act_T) |
| then |
| Error_Msg_N |
| ("actual of non-abstract formal cannot be abstract", Actual); |
| end if; |
| |
| if Is_Scalar_Type (Gen_T) then |
| Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T)); |
| end if; |
| end if; |
| |
| case Nkind (Def) is |
| when N_Formal_Private_Type_Definition => |
| Validate_Private_Type_Instance; |
| |
| when N_Formal_Derived_Type_Definition => |
| Validate_Derived_Type_Instance; |
| |
| when N_Formal_Discrete_Type_Definition => |
| if not Is_Discrete_Type (Act_T) then |
| Error_Msg_NE |
| ("expect discrete type in instantiation of&", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| when N_Formal_Signed_Integer_Type_Definition => |
| if not Is_Signed_Integer_Type (Act_T) then |
| Error_Msg_NE |
| ("expect signed integer type in instantiation of&", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| when N_Formal_Modular_Type_Definition => |
| if not Is_Modular_Integer_Type (Act_T) then |
| Error_Msg_NE |
| ("expect modular type in instantiation of &", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| when N_Formal_Floating_Point_Definition => |
| if not Is_Floating_Point_Type (Act_T) then |
| Error_Msg_NE |
| ("expect float type in instantiation of &", Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| when N_Formal_Ordinary_Fixed_Point_Definition => |
| if not Is_Ordinary_Fixed_Point_Type (Act_T) then |
| Error_Msg_NE |
| ("expect ordinary fixed point type in instantiation of &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| when N_Formal_Decimal_Fixed_Point_Definition => |
| if not Is_Decimal_Fixed_Point_Type (Act_T) then |
| Error_Msg_NE |
| ("expect decimal type in instantiation of &", |
| Actual, Gen_T); |
| Abandon_Instantiation (Actual); |
| end if; |
| |
| when N_Array_Type_Definition => |
| Validate_Array_Type_Instance; |
| |
| when N_Access_To_Object_Definition => |
| Validate_Access_Type_Instance; |
| |
| when N_Access_Function_Definition | |
| N_Access_Procedure_Definition => |
| Validate_Access_Subprogram_Instance; |
| |
| when others => |
| raise Program_Error; |
| |
| end case; |
| |
| Decl_Node := |
| Make_Subtype_Declaration (Loc, |
| Defining_Identifier => New_Copy (Gen_T), |
| Subtype_Indication => New_Reference_To (Act_T, Loc)); |
| |
| if Is_Private_Type (Act_T) then |
| Set_Has_Private_View (Subtype_Indication (Decl_Node)); |
| |
| elsif Is_Access_Type (Act_T) |
| and then Is_Private_Type (Designated_Type (Act_T)) |
| then |
| Set_Has_Private_View (Subtype_Indication (Decl_Node)); |
| end if; |
| |
| -- Flag actual derived types so their elaboration produces the |
| -- appropriate renamings for the primitive operations of the ancestor. |
| -- Flag actual for formal private types as well, to determine whether |
| -- operations in the private part may override inherited operations. |
| |
| if Nkind (Def) = N_Formal_Derived_Type_Definition |
| or else Nkind (Def) = N_Formal_Private_Type_Definition |
| then |
| Set_Generic_Parent_Type (Decl_Node, Ancestor); |
| end if; |
| |
| return Decl_Node; |
| end Instantiate_Type; |
| |
| --------------------- |
| -- Is_In_Main_Unit -- |
| --------------------- |
| |
| function Is_In_Main_Unit (N : Node_Id) return Boolean is |
| Unum : constant Unit_Number_Type := Get_Source_Unit (N); |
| Current_Unit : Node_Id; |
| |
| begin |
| if Unum = Main_Unit then |
| return True; |
| |
| -- If the current unit is a subunit then it is either the main unit |
| -- or is being compiled as part of the main unit. |
| |
| elsif Nkind (N) = N_Compilation_Unit then |
| return Nkind (Unit (N)) = N_Subunit; |
| end if; |
| |
| Current_Unit := Parent (N); |
| while Present (Current_Unit) |
| and then Nkind (Current_Unit) /= N_Compilation_Unit |
| loop |
| Current_Unit := Parent (Current_Unit); |
| end loop; |
| |
| -- The instantiation node is in the main unit, or else the current |
| -- node (perhaps as the result of nested instantiations) is in the |
| -- main unit, or in the declaration of the main unit, which in this |
| -- last case must be a body. |
| |
| return Unum = Main_Unit |
| or else Current_Unit = Cunit (Main_Unit) |
| or else Current_Unit = Library_Unit (Cunit (Main_Unit)) |
| or else (Present (Library_Unit (Current_Unit)) |
| and then Is_In_Main_Unit (Library_Unit (Current_Unit))); |
| end Is_In_Main_Unit; |
| |
| ---------------------------- |
| -- Load_Parent_Of_Generic -- |
| ---------------------------- |
| |
| procedure Load_Parent_Of_Generic (N : Node_Id; Spec : Node_Id) is |
| Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec)); |
| Save_Style_Check : constant Boolean := Style_Check; |
| True_Parent : Node_Id; |
| Inst_Node : Node_Id; |
| OK : Boolean; |
| |
| begin |
| if not In_Same_Source_Unit (N, Spec) |
| or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration |
| or else (Nkind (Unit (Comp_Unit)) = N_Package_Body |
| and then not Is_In_Main_Unit (Spec)) |
| then |
| -- Find body of parent of spec, and analyze it. A special case |
| -- arises when the parent is an instantiation, that is to say when |
| -- we are currently instantiating a nested generic. In that case, |
| -- there is no separate file for the body of the enclosing instance. |
| -- Instead, the enclosing body must be instantiated as if it were |
| -- a pending instantiation, in order to produce the body for the |
| -- nested generic we require now. Note that in that case the |
| -- generic may be defined in a package body, the instance defined |
| -- in the same package body, and the original enclosing body may not |
| -- be in the main unit. |
| |
| True_Parent := Parent (Spec); |
| Inst_Node := Empty; |
| |
| while Present (True_Parent) |
| and then Nkind (True_Parent) /= N_Compilation_Unit |
| loop |
| if Nkind (True_Parent) = N_Package_Declaration |
| and then |
| Nkind (Original_Node (True_Parent)) = N_Package_Instantiation |
| then |
| -- Parent is a compilation unit that is an instantiation. |
| -- Instantiation node has been replaced with package decl. |
| |
| Inst_Node := Original_Node (True_Parent); |
| exit; |
| |
| elsif Nkind (True_Parent) = N_Package_Declaration |
| and then Present (Generic_Parent (Specification (True_Parent))) |
| and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit |
| then |
| -- Parent is an instantiation within another specification. |
| -- Declaration for instance has been inserted before original |
| -- instantiation node. A direct link would be preferable? |
| |
| Inst_Node := Next (True_Parent); |
| |
| while Present (Inst_Node) |
| and then Nkind (Inst_Node) /= N_Package_Instantiation |
| loop |
| Next (Inst_Node); |
| end loop; |
| |
| -- If the instance appears within a generic, and the generic |
| -- unit is defined within a formal package of the enclosing |
| -- generic, there is no generic body available, and none |
| -- needed. A more precise test should be used ??? |
| |
| if No (Inst_Node) then |
| return; |
| end if; |
| |
| exit; |
| else |
| True_Parent := Parent (True_Parent); |
| end if; |
| end loop; |
| |
| -- Case where we are currently instantiating a nested generic |
| |
| if Present (Inst_Node) then |
| if Nkind (Parent (True_Parent)) = N_Compilation_Unit then |
| |
| -- Instantiation node and declaration of instantiated package |
| -- were exchanged when only the declaration was needed. |
| -- Restore instantiation node before proceeding with body. |
| |
| Set_Unit (Parent (True_Parent), Inst_Node); |
| end if; |
| |
| -- Now complete instantiation of enclosing body, if it appears |
| -- in some other unit. If it appears in the current unit, the |
| -- body will have been instantiated already. |
| |
| if No (Corresponding_Body (Instance_Spec (Inst_Node))) then |
| |
| -- We need to determine the expander mode to instantiate |
| -- the enclosing body. Because the generic body we need |
| -- may use global entities declared in the enclosing package |
| -- (including aggregates) it is in general necessary to |
| -- compile this body with expansion enabled. The exception |
| -- is if we are within a generic package, in which case |
| -- the usual generic rule applies. |
| |
| declare |
| Exp_Status : Boolean := True; |
| Scop : Entity_Id; |
| |
| begin |
| -- Loop through scopes looking for generic package |
| |
| Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node))); |
| while Present (Scop) |
| and then Scop /= Standard_Standard |
| loop |
| if Ekind (Scop) = E_Generic_Package then |
| Exp_Status := False; |
| exit; |
| end if; |
| |
| Scop := Scope (Scop); |
| end loop; |
| |
| Instantiate_Package_Body |
| (Pending_Body_Info'( |
| Inst_Node, True_Parent, Exp_Status, |
| Get_Code_Unit (Sloc (Inst_Node)))); |
| end; |
| end if; |
| |
| -- Case where we are not instantiating a nested generic |
| |
| else |
| Opt.Style_Check := False; |
| Expander_Mode_Save_And_Set (True); |
| Load_Needed_Body (Comp_Unit, OK); |
| Opt.Style_Check := Save_Style_Check; |
| Expander_Mode_Restore; |
| |
| if not OK |
| and then Unit_Requires_Body (Defining_Entity (Spec)) |
| then |
| declare |
| Bname : constant Unit_Name_Type := |
| Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit))); |
| |
| begin |
| Error_Msg_Unit_1 := Bname; |
| Error_Msg_N ("this instantiation requires$!", N); |
| Error_Msg_Name_1 := |
| Get_File_Name (Bname, Subunit => False); |
| Error_Msg_N ("\but file{ was not found!", N); |
| raise Unrecoverable_Error; |
| end; |
| end if; |
| end if; |
| end if; |
| |
| -- If loading the parent of the generic caused an instantiation |
| -- circularity, we abandon compilation at this point, because |
| -- otherwise in some cases we get into trouble with infinite |
| -- recursions after this point. |
| |
| if Circularity_Detected then |
| raise Unrecoverable_Error; |
| end if; |
| end Load_Parent_Of_Generic; |
| |
| ----------------------- |
| -- Move_Freeze_Nodes -- |
| ----------------------- |
| |
| procedure Move_Freeze_Nodes |
| (Out_Of : Entity_Id; |
| After : Node_Id; |
| L : List_Id) |
| is |
| Decl : Node_Id; |
| Next_Decl : Node_Id; |
| Next_Node : Node_Id := After; |
| Spec : Node_Id; |
| |
| function Is_Outer_Type (T : Entity_Id) return Boolean; |
| -- Check whether entity is declared in a scope external to that |
| -- of the generic unit. |
| |
| ------------------- |
| -- Is_Outer_Type -- |
| ------------------- |
| |
| function Is_Outer_Type (T : Entity_Id) return Boolean is |
| Scop : Entity_Id := Scope (T); |
| |
| begin |
| if Scope_Depth (Scop) < Scope_Depth (Out_Of) then |
| return True; |
| |
| else |
| while Scop /= Standard_Standard loop |
| |
| if Scop = Out_Of then |
| return False; |
| else |
| Scop := Scope (Scop); |
| end if; |
| end loop; |
| |
| return True; |
| end if; |
| end Is_Outer_Type; |
| |
| -- Start of processing for Move_Freeze_Nodes |
| |
| begin |
| if No (L) then |
| return; |
| end if; |
| |
| -- First remove the freeze nodes that may appear before all other |
| -- declarations. |
| |
| Decl := First (L); |
| while Present (Decl) |
| and then Nkind (Decl) = N_Freeze_Entity |
| and then Is_Outer_Type (Entity (Decl)) |
| loop |
| Decl := Remove_Head (L); |
| Insert_After (Next_Node, Decl); |
| Set_Analyzed (Decl, False); |
| Next_Node := Decl; |
| Decl := First (L); |
| end loop; |
| |
| -- Next scan the list of declarations and remove each freeze node that |
| -- appears ahead of the current node. |
| |
| while Present (Decl) loop |
| while Present (Next (Decl)) |
| and then Nkind (Next (Decl)) = N_Freeze_Entity |
| and then Is_Outer_Type (Entity (Next (Decl))) |
| loop |
| Next_Decl := Remove_Next (Decl); |
| Insert_After (Next_Node, Next_Decl); |
| Set_Analyzed (Next_Decl, False); |
| Next_Node := Next_Decl; |
| end loop; |
| |
| -- If the declaration is a nested package or concurrent type, then |
| -- recurse. Nested generic packages will have been processed from the |
| -- inside out. |
| |
| if Nkind (Decl) = N_Package_Declaration then |
| Spec := Specification (Decl); |
| |
| elsif Nkind (Decl) = N_Task_Type_Declaration then |
| Spec := Task_Definition (Decl); |
| |
| elsif Nkind (Decl) = N_Protected_Type_Declaration then |
| Spec := Protected_Definition (Decl); |
| |
| else |
| Spec := Empty; |
| end if; |
| |
| if Present (Spec) then |
| Move_Freeze_Nodes (Out_Of, Next_Node, |
| Visible_Declarations (Spec)); |
| Move_Freeze_Nodes (Out_Of, Next_Node, |
| Private_Declarations (Spec)); |
| end if; |
| |
| Next (Decl); |
| end loop; |
| end Move_Freeze_Nodes; |
| |
| ---------------- |
| -- Next_Assoc -- |
| ---------------- |
| |
| function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is |
| begin |
| return Generic_Renamings.Table (E).Next_In_HTable; |
| end Next_Assoc; |
| |
| ------------------------ |
| -- Preanalyze_Actuals -- |
| ------------------------ |
| |
| procedure Pre_Analyze_Actuals (N : Node_Id) is |
| Assoc : Node_Id; |
| Act : Node_Id; |
| Errs : constant Int := Serious_Errors_Detected; |
| |
| begin |
| Assoc := First (Generic_Associations (N)); |
| |
| while Present (Assoc) loop |
| Act := Explicit_Generic_Actual_Parameter (Assoc); |
| |
| -- Within a nested instantiation, a defaulted actual is an |
| -- empty association, so nothing to analyze. If the actual for |
| -- a subprogram is an attribute, analyze prefix only, because |
| -- actual is not a complete attribute reference. |
| |
| -- If actual is an allocator, analyze expression only. The full |
| -- analysis can generate code, and if the instance is a compilation |
| -- unit we have to wait until the package instance is installed to |
| -- have a proper place to insert this code. |
| |
| -- String literals may be operators, but at this point we do not |
| -- know whether the actual is a formal subprogram or a string. |
| |
| if No (Act) then |
| null; |
| |
| elsif Nkind (Act) = N_Attribute_Reference then |
| Analyze (Prefix (Act)); |
| |
| elsif Nkind (Act) = N_Explicit_Dereference then |
| Analyze (Prefix (Act)); |
| |
| elsif Nkind (Act) = N_Allocator then |
| declare |
| Expr : constant Node_Id := Expression (Act); |
| |
| begin |
| if Nkind (Expr) = N_Subtype_Indication then |
| Analyze (Subtype_Mark (Expr)); |
| Analyze_List (Constraints (Constraint (Expr))); |
| else |
| Analyze (Expr); |
| end if; |
| end; |
| |
| elsif Nkind (Act) /= N_Operator_Symbol then |
| Analyze (Act); |
| end if; |
| |
| if Errs /= Serious_Errors_Detected then |
| Abandon_Instantiation (Act); |
| end if; |
| |
| Next (Assoc); |
| end loop; |
| end Pre_Analyze_Actuals; |
| |
| ------------------- |
| -- Remove_Parent -- |
| ------------------- |
| |
| procedure Remove_Parent (In_Body : Boolean := False) is |
| S : Entity_Id := Current_Scope; |
| E : Entity_Id; |
| P : Entity_Id; |
| Hidden : Elmt_Id; |
| |
| begin |
| -- After child instantiation is complete, remove from scope stack |
| -- the extra copy of the current scope, and then remove parent |
| -- instances. |
| |
| if not In_Body then |
| Pop_Scope; |
| |
| while Current_Scope /= S loop |
| P := Current_Scope; |
| End_Package_Scope (Current_Scope); |
| |
| if In_Open_Scopes (P) then |
| E := First_Entity (P); |
| |
| while Present (E) loop |
| Set_Is_Immediately_Visible (E, True); |
| Next_Entity (E); |
| end loop; |
| |
| if Is_Generic_Instance (Current_Scope) |
| and then P /= Current_Scope |
| then |
| -- We are within an instance of some sibling. Retain |
| -- visibility of parent, for proper subsequent cleanup, |
| -- and reinstall private declarations as well. |
| |
| Set_In_Private_Part (P); |
| Install_Private_Declarations (P); |
| end if; |
| |
| -- This looks incomplete: what about compilation units that |
| -- were made visible by Install_Parent but should not remain |
| -- visible??? Standard is on the scope stack. |
| |
| elsif not In_Open_Scopes (Scope (P)) then |
| Set_Is_Immediately_Visible (P, False); |
| end if; |
| end loop; |
| |
| -- Reset visibility of entities in the enclosing scope. |
| |
| Set_Is_Hidden_Open_Scope (Current_Scope, False); |
| Hidden := First_Elmt (Hidden_Entities); |
| |
| while Present (Hidden) loop |
| Set_Is_Immediately_Visible (Node (Hidden), True); |
| Next_Elmt (Hidden); |
| end loop; |
| |
| else |
| -- Each body is analyzed separately, and there is no context |
| -- that needs preserving from one body instance to the next, |
| -- so remove all parent scopes that have been installed. |
| |
| while Present (S) loop |
| End_Package_Scope (S); |
| Set_Is_Immediately_Visible (S, False); |
| S := Current_Scope; |
| exit when S = Standard_Standard; |
| end loop; |
| end if; |
| |
| end Remove_Parent; |
| |
| ----------------- |
| -- Restore_Env -- |
| ----------------- |
| |
| procedure Restore_Env is |
| Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last); |
| |
| begin |
| Ada_Version := Saved.Ada_Version; |
| |
| if No (Current_Instantiated_Parent.Act_Id) then |
| |
| -- Restore environment after subprogram inlining |
| |
| Restore_Private_Views (Empty); |
| end if; |
| |
| Current_Instantiated_Parent := Saved.Instantiated_Parent; |
| Exchanged_Views := Saved.Exchanged_Views; |
| Hidden_Entities := Saved.Hidden_Entities; |
| Current_Sem_Unit := Saved.Current_Sem_Unit; |
| |
| Instance_Envs.Decrement_Last; |
| end Restore_Env; |
| |
| --------------------------- |
| -- Restore_Private_Views -- |
| --------------------------- |
| |
| procedure Restore_Private_Views |
| (Pack_Id : Entity_Id; |
| Is_Package : Boolean := True) |
| is |
| M : Elmt_Id; |
| E : Entity_Id; |
| Typ : Entity_Id; |
| Dep_Elmt : Elmt_Id; |
| Dep_Typ : Node_Id; |
| |
| procedure Restore_Nested_Formal (Formal : Entity_Id); |
| -- Hide the generic formals of formal packages declared with box |
| -- which were reachable in the current instantiation. |
| |
| procedure Restore_Nested_Formal (Formal : Entity_Id) is |
| Ent : Entity_Id; |
| begin |
| if Present (Renamed_Object (Formal)) |
| and then Denotes_Formal_Package (Renamed_Object (Formal), True) |
| then |
| return; |
| |
| elsif Present (Associated_Formal_Package (Formal)) |
| and then Box_Present (Parent (Associated_Formal_Package (Formal))) |
| then |
| Ent := First_Entity (Formal); |
| |
| while Present (Ent) loop |
| exit when Ekind (Ent) = E_Package |
| and then Renamed_Entity (Ent) = Renamed_Entity (Formal); |
| |
| Set_Is_Hidden (Ent); |
| Set_Is_Potentially_Use_Visible (Ent, False); |
| |
| if Ekind (Ent) = E_Package then |
| -- Recurse. |
| Restore_Nested_Formal (Ent); |
| end if; |
| |
| Next_Entity (Ent); |
| end loop; |
| end if; |
| end Restore_Nested_Formal; |
| |
| begin |
| M := First_Elmt (Exchanged_Views); |
| while Present (M) loop |
| Typ := Node (M); |
| |
| -- Subtypes of types whose views have been exchanged, and that |
| -- are defined within the instance, were not on the list of |
| -- Private_Dependents on entry to the instance, so they have to |
| -- be exchanged explicitly now, in order to remain consistent with |
| -- the view of the parent type. |
| |
| if Ekind (Typ) = E_Private_Type |
| or else Ekind (Typ) = E_Limited_Private_Type |
| or else Ekind (Typ) = E_Record_Type_With_Private |
| then |
| Dep_Elmt := First_Elmt (Private_Dependents (Typ)); |
| |
| while Present (Dep_Elmt) loop |
| Dep_Typ := Node (Dep_Elmt); |
| |
| if Scope (Dep_Typ) = Pack_Id |
| and then Present (Full_View (Dep_Typ)) |
| then |
| Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ)); |
| Exchange_Declarations (Dep_Typ); |
| end if; |
| |
| Next_Elmt (Dep_Elmt); |
| end loop; |
| end if; |
| |
| Exchange_Declarations (Node (M)); |
| Next_Elmt (M); |
| end loop; |
| |
| if No (Pack_Id) then |
| return; |
| end if; |
| |
| -- Make the generic formal parameters private, and make the formal |
| -- types into subtypes of the actuals again. |
| |
| E := First_Entity (Pack_Id); |
| |
| while Present (E) loop |
| Set_Is_Hidden (E, True); |
| |
| if Is_Type (E) |
| and then Nkind (Parent (E)) = N_Subtype_Declaration |
| then |
| Set_Is_Generic_Actual_Type (E, False); |
| |
| -- An unusual case of aliasing: the actual may also be directly |
| -- visible in the generic, and be private there, while it is |
| -- fully visible in the context of the instance. The internal |
| -- subtype is private in the instance, but has full visibility |
| -- like its parent in the enclosing scope. This enforces the |
| -- invariant that the privacy status of all private dependents of |
| -- a type coincide with that of the parent type. This can only |
| -- happen when a generic child unit is instantiated within a |
| -- sibling. |
| |
| if Is_Private_Type (E) |
| and then not Is_Private_Type (Etype (E)) |
| then |
| Exchange_Declarations (E); |
| end if; |
| |
| elsif Ekind (E) = E_Package then |
| |
| -- The end of the renaming list is the renaming of the generic |
| -- package itself. If the instance is a subprogram, all entities |
| -- in the corresponding package are renamings. If this entity is |
| -- a formal package, make its own formals private as well. The |
| -- actual in this case is itself the renaming of an instantation. |
| -- If the entity is not a package renaming, it is the entity |
| -- created to validate formal package actuals: ignore. |
| |
| -- If the actual is itself a formal package for the enclosing |
| -- generic, or the actual for such a formal package, it remains |
| -- visible on exit from the instance, and therefore nothing |
| -- needs to be done either, except to keep it accessible. |
| |
| if Is_Package |
| and then Renamed_Object (E) = Pack_Id |
| then |
| exit; |
| |
| elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then |
| null; |
| |
| elsif Denotes_Formal_Package (Renamed_Object (E), True) then |
| Set_Is_Hidden (E, False); |
| |
| else |
| declare |
| Act_P : constant Entity_Id := Renamed_Object (E); |
| Id : Entity_Id; |
| |
| begin |
| Id := First_Entity (Act_P); |
| while Present (Id) |
| and then Id /= First_Private_Entity (Act_P) |
| loop |
| exit when Ekind (Id) = E_Package |
| and then Renamed_Object (Id) = Act_P; |
| |
| Set_Is_Hidden (Id, True); |
| Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P)); |
| |
| if Ekind (Id) = E_Package then |
| Restore_Nested_Formal (Id); |
| end if; |
| |
| Next_Entity (Id); |
| end loop; |
| end; |
| end if; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| end Restore_Private_Views; |
| |
| -------------- |
| -- Save_Env -- |
| -------------- |
| |
| procedure Save_Env |
| (Gen_Unit : Entity_Id; |
| Act_Unit : Entity_Id) |
| is |
| begin |
| Init_Env; |
| Set_Instance_Env (Gen_Unit, Act_Unit); |
| end Save_Env; |
| |
| ---------------------------- |
| -- Save_Global_References -- |
| ---------------------------- |
| |
| procedure Save_Global_References (N : Node_Id) is |
| Gen_Scope : Entity_Id; |
| E : Entity_Id; |
| N2 : Node_Id; |
| |
| function Is_Global (E : Entity_Id) return Boolean; |
| -- Check whether entity is defined outside of generic unit. |
| -- Examine the scope of an entity, and the scope of the scope, |
| -- etc, until we find either Standard, in which case the entity |
| -- is global, or the generic unit itself, which indicates that |
| -- the entity is local. If the entity is the generic unit itself, |
| -- as in the case of a recursive call, or the enclosing generic unit, |
| -- if different from the current scope, then it is local as well, |
| -- because it will be replaced at the point of instantiation. On |
| -- the other hand, if it is a reference to a child unit of a common |
| -- ancestor, which appears in an instantiation, it is global because |
| -- it is used to denote a specific compilation unit at the time the |
| -- instantiations will be analyzed. |
| |
| procedure Reset_Entity (N : Node_Id); |
| -- Save semantic information on global entity, so that it is not |
| -- resolved again at instantiation time. |
| |
| procedure Save_Entity_Descendants (N : Node_Id); |
| -- Apply Save_Global_References to the two syntactic descendants of |
| -- non-terminal nodes that carry an Associated_Node and are processed |
| -- through Reset_Entity. Once the global entity (if any) has been |
| -- captured together with its type, only two syntactic descendants |
| -- need to be traversed to complete the processing of the tree rooted |
| -- at N. This applies to Selected_Components, Expanded_Names, and to |
| -- Operator nodes. N can also be a character literal, identifier, or |
| -- operator symbol node, but the call has no effect in these cases. |
| |
| procedure Save_Global_Defaults (N1, N2 : Node_Id); |
| -- Default actuals in nested instances must be handled specially |
| -- because there is no link to them from the original tree. When an |
| -- actual subprogram is given by a default, we add an explicit generic |
| -- association for it in the instantiation node. When we save the |
| -- global references on the name of the instance, we recover the list |
| -- of generic associations, and add an explicit one to the original |
| -- generic tree, through which a global actual can be preserved. |
| -- Similarly, if a child unit is instantiated within a sibling, in the |
| -- context of the parent, we must preserve the identifier of the parent |
| -- so that it can be properly resolved in a subsequent instantiation. |
| |
| procedure Save_Global_Descendant (D : Union_Id); |
| -- Apply Save_Global_References recursively to the descendents of |
| -- current node. |
| |
| procedure Save_References (N : Node_Id); |
| -- This is the recursive procedure that does the work, once the |
| -- enclosing generic scope has been established. |
| |
| --------------- |
| -- Is_Global -- |
| --------------- |
| |
| function Is_Global (E : Entity_Id) return Boolean is |
| Se : Entity_Id := Scope (E); |
| |
| function Is_Instance_Node (Decl : Node_Id) return Boolean; |
| -- Determine whether the parent node of a reference to a child unit |
| -- denotes an instantiation or a formal package, in which case the |
| -- reference to the child unit is global, even if it appears within |
| -- the current scope (e.g. when the instance appears within the body |
| -- of an ancestor). |
| |
| ---------------------- |
| -- Is_Instance_Node -- |
| ---------------------- |
| |
| function Is_Instance_Node (Decl : Node_Id) return Boolean is |
| begin |
| return (Nkind (Decl) in N_Generic_Instantiation |
| or else |
| Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration); |
| end Is_Instance_Node; |
| |
| -- Start of processing for Is_Global |
| |
| begin |
| if E = Gen_Scope then |
| return False; |
| |
| elsif E = Standard_Standard then |
| return True; |
| |
| elsif Is_Child_Unit (E) |
| and then (Is_Instance_Node (Parent (N2)) |
| or else (Nkind (Parent (N2)) = N_Expanded_Name |
| and then N2 = Selector_Name (Parent (N2)) |
| and then Is_Instance_Node (Parent (Parent (N2))))) |
| then |
| return True; |
| |
| else |
| while Se /= Gen_Scope loop |
| if Se = Standard_Standard then |
| return True; |
| else |
| Se := Scope (Se); |
| end if; |
| end loop; |
| |
| return False; |
| end if; |
| end Is_Global; |
| |
| ------------------ |
| -- Reset_Entity -- |
| ------------------ |
| |
| procedure Reset_Entity (N : Node_Id) is |
| |
| procedure Set_Global_Type (N : Node_Id; N2 : Node_Id); |
| -- The type of N2 is global to the generic unit. Save the |
| -- type in the generic node. |
| |
| function Top_Ancestor (E : Entity_Id) return Entity_Id; |
| -- Find the ultimate ancestor of the current unit. If it is |
| -- not a generic unit, then the name of the current unit |
| -- in the prefix of an expanded name must be replaced with |
| -- its generic homonym to ensure that it will be properly |
| -- resolved in an instance. |
| |
| --------------------- |
| -- Set_Global_Type -- |
| --------------------- |
| |
| procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is |
| Typ : constant Entity_Id := Etype (N2); |
| |
| begin |
| Set_Etype (N, Typ); |
| |
| if Entity (N) /= N2 |
| and then Has_Private_View (Entity (N)) |
| then |
| -- If the entity of N is not the associated node, this is |
| -- a nested generic and it has an associated node as well, |
| -- whose type is already the full view (see below). Indicate |
| -- that the original node has a private view. |
| |
| Set_Has_Private_View (N); |
| end if; |
| |
| -- If not a private type, nothing else to do |
| |
| if not Is_Private_Type (Typ) then |
| if Is_Array_Type (Typ) |
| and then Is_Private_Type (Component_Type (Typ)) |
| then |
| Set_Has_Private_View (N); |
| end if; |
| |
| -- If it is a derivation of a private type in a context where |
| -- no full view is needed, nothing to do either. |
| |
| elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then |
| null; |
| |
| -- Otherwise mark the type for flipping and use the full_view |
| -- when available. |
| |
| else |
| Set_Has_Private_View (N); |
| |
| if Present (Full_View (Typ)) then |
| Set_Etype (N2, Full_View (Typ)); |
| end if; |
| end if; |
| end Set_Global_Type; |
| |
| ------------------ |
| -- Top_Ancestor -- |
| ------------------ |
| |
| function Top_Ancestor (E : Entity_Id) return Entity_Id is |
| Par : Entity_Id := E; |
| |
| begin |
| while Is_Child_Unit (Par) loop |
| Par := Scope (Par); |
| end loop; |
| |
| return Par; |
| end Top_Ancestor; |
| |
| -- Start of processing for Reset_Entity |
| |
| begin |
| N2 := Get_Associated_Node (N); |
| E := Entity (N2); |
| |
| if Present (E) then |
| if Is_Global (E) then |
| Set_Global_Type (N, N2); |
| |
| elsif Nkind (N) = N_Op_Concat |
| and then Is_Generic_Type (Etype (N2)) |
| and then |
| (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2) |
| or else Base_Type (Etype (Left_Opnd (N2))) = Etype (N2)) |
| and then Is_Intrinsic_Subprogram (E) |
| then |
| null; |
| |
| else |
| -- Entity is local. Mark generic node as unresolved. |
| -- Note that now it does not have an entity. |
| |
| Set_Associated_Node (N, Empty); |
| Set_Etype (N, Empty); |
| end if; |
| |
| if (Nkind (Parent (N)) = N_Package_Instantiation |
| or else Nkind (Parent (N)) = N_Function_Instantiation |
| or else Nkind (Parent (N)) = N_Procedure_Instantiation) |
| and then N = Name (Parent (N)) |
| then |
| Save_Global_Defaults (Parent (N), Parent (N2)); |
| end if; |
| |
| elsif Nkind (Parent (N)) = N_Selected_Component |
| and then Nkind (Parent (N2)) = N_Expanded_Name |
| then |
| |
| if Is_Global (Entity (Parent (N2))) then |
| Change_Selected_Component_To_Expanded_Name (Parent (N)); |
| Set_Associated_Node (Parent (N), Parent (N2)); |
| Set_Global_Type (Parent (N), Parent (N2)); |
| Save_Entity_Descendants (N); |
| |
| -- If this is a reference to the current generic entity, |
| -- replace by the name of the generic homonym of the current |
| -- package. This is because in an instantiation Par.P.Q will |
| -- not resolve to the name of the instance, whose enclosing |
| -- scope is not necessarily Par. We use the generic homonym |
| -- rather that the name of the generic itself, because it may |
| -- be hidden by a local declaration. |
| |
| elsif In_Open_Scopes (Entity (Parent (N2))) |
| and then not |
| Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2))))) |
| then |
| if Ekind (Entity (Parent (N2))) = E_Generic_Package then |
| Rewrite (Parent (N), |
| Make_Identifier (Sloc (N), |
| Chars => |
| Chars (Generic_Homonym (Entity (Parent (N2)))))); |
| else |
| Rewrite (Parent (N), |
| Make_Identifier (Sloc (N), |
| Chars => Chars (Selector_Name (Parent (N2))))); |
| end if; |
| end if; |
| |
| if (Nkind (Parent (Parent (N))) = N_Package_Instantiation |
| or else Nkind (Parent (Parent (N))) |
| = N_Function_Instantiation |
| or else Nkind (Parent (Parent (N))) |
| = N_Procedure_Instantiation) |
| and then Parent (N) = Name (Parent (Parent (N))) |
| then |
| Save_Global_Defaults |
| (Parent (Parent (N)), Parent (Parent ((N2)))); |
| end if; |
| |
| -- A selected component may denote a static constant that has |
| -- been folded. Make the same replacement in original tree. |
| |
| elsif Nkind (Parent (N)) = N_Selected_Component |
| and then (Nkind (Parent (N2)) = N_Integer_Literal |
| or else Nkind (Parent (N2)) = N_Real_Literal) |
| then |
| Rewrite (Parent (N), |
| New_Copy (Parent (N2))); |
| Set_Analyzed (Parent (N), False); |
| |
| -- A selected component may be transformed into a parameterless |
| -- function call. If the called entity is global, rewrite the |
| -- node appropriately, i.e. as an extended name for the global |
| -- entity. |
| |
| elsif Nkind (Parent (N)) = N_Selected_Component |
| and then Nkind (Parent (N2)) = N_Function_Call |
| and then Is_Global (Entity (Name (Parent (N2)))) |
| then |
| Change_Selected_Component_To_Expanded_Name (Parent (N)); |
| Set_Associated_Node (Parent (N), Name (Parent (N2))); |
| Set_Global_Type (Parent (N), Name (Parent (N2))); |
| Save_Entity_Descendants (N); |
| |
| else |
| -- Entity is local. Reset in generic unit, so that node |
| -- is resolved anew at the point of instantiation. |
| |
| Set_Associated_Node (N, Empty); |
| Set_Etype (N, Empty); |
| end if; |
| end Reset_Entity; |
| |
| ----------------------------- |
| -- Save_Entity_Descendants -- |
| ----------------------------- |
| |
| procedure Save_Entity_Descendants (N : Node_Id) is |
| begin |
| case Nkind (N) is |
| when N_Binary_Op => |
| Save_Global_Descendant (Union_Id (Left_Opnd (N))); |
| Save_Global_Descendant (Union_Id (Right_Opnd (N))); |
| |
| when N_Unary_Op => |
| Save_Global_Descendant (Union_Id (Right_Opnd (N))); |
| |
| when N_Expanded_Name | N_Selected_Component => |
| Save_Global_Descendant (Union_Id (Prefix (N))); |
| Save_Global_Descendant (Union_Id (Selector_Name (N))); |
| |
| when N_Identifier | N_Character_Literal | N_Operator_Symbol => |
| null; |
| |
| when others => |
| raise Program_Error; |
| end case; |
| end Save_Entity_Descendants; |
| |
| -------------------------- |
| -- Save_Global_Defaults -- |
| -------------------------- |
| |
| procedure Save_Global_Defaults (N1, N2 : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (N1); |
| Assoc2 : constant List_Id := Generic_Associations (N2); |
| Gen_Id : constant Entity_Id := Get_Generic_Entity (N2); |
| Assoc1 : List_Id; |
| Act1 : Node_Id; |
| Act2 : Node_Id; |
| Def : Node_Id; |
| Ndec : Node_Id; |
| Subp : Entity_Id; |
| Actual : Entity_Id; |
| |
| begin |
| Assoc1 := Generic_Associations (N1); |
| |
| if Present (Assoc1) then |
| Act1 := First (Assoc1); |
| else |
| Act1 := Empty; |
| Set_Generic_Associations (N1, New_List); |
| Assoc1 := Generic_Associations (N1); |
| end if; |
| |
| if Present (Assoc2) then |
| Act2 := First (Assoc2); |
| else |
| return; |
| end if; |
| |
| while Present (Act1) and then Present (Act2) loop |
| Next (Act1); |
| Next (Act2); |
| end loop; |
| |
| -- Find the associations added for default suprograms. |
| |
| if Present (Act2) then |
| while Nkind (Act2) /= N_Generic_Association |
| or else No (Entity (Selector_Name (Act2))) |
| or else not Is_Overloadable (Entity (Selector_Name (Act2))) |
| loop |
| Next (Act2); |
| end loop; |
| |
| -- Add a similar association if the default is global. The |
| -- renaming declaration for the actual has been analyzed, and |
| -- its alias is the program it renames. Link the actual in the |
| -- original generic tree with the node in the analyzed tree. |
| |
| while Present (Act2) loop |
| Subp := Entity (Selector_Name (Act2)); |
| Def := Explicit_Generic_Actual_Parameter (Act2); |
| |
| -- Following test is defence against rubbish errors |
| |
| if No (Alias (Subp)) then |
| return; |
| end if; |
| |
| -- Retrieve the resolved actual from the renaming declaration |
| -- created for the instantiated formal. |
| |
| Actual := Entity (Name (Parent (Parent (Subp)))); |
| Set_Entity (Def, Actual); |
| Set_Etype (Def, Etype (Actual)); |
| |
| if Is_Global (Actual) then |
| Ndec := |
| Make_Generic_Association (Loc, |
| Selector_Name => New_Occurrence_Of (Subp, Loc), |
| Explicit_Generic_Actual_Parameter => |
| New_Occurrence_Of (Actual, Loc)); |
| |
| Set_Associated_Node |
| (Explicit_Generic_Actual_Parameter (Ndec), Def); |
| |
| Append (Ndec, Assoc1); |
| |
| -- If there are other defaults, add a dummy association |
| -- in case there are other defaulted formals with the same |
| -- name. |
| |
| elsif Present (Next (Act2)) then |
| Ndec := |
| Make_Generic_Association (Loc, |
| Selector_Name => New_Occurrence_Of (Subp, Loc), |
| Explicit_Generic_Actual_Parameter => Empty); |
| |
| Append (Ndec, Assoc1); |
| end if; |
| |
| Next (Act2); |
| end loop; |
| end if; |
| |
| if Nkind (Name (N1)) = N_Identifier |
| and then Is_Child_Unit (Gen_Id) |
| and then Is_Global (Gen_Id) |
| and then Is_Generic_Unit (Scope (Gen_Id)) |
| and then In_Open_Scopes (Scope (Gen_Id)) |
| then |
| -- This is an instantiation of a child unit within a sibling, |
| -- so that the generic parent is in scope. An eventual instance |
| -- must occur within the scope of an instance of the parent. |
| -- Make name in instance into an expanded name, to preserve the |
| -- identifier of the parent, so it can be resolved subsequently. |
| |
| Rewrite (Name (N2), |
| Make_Expanded_Name (Loc, |
| Chars => Chars (Gen_Id), |
| Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc), |
| Selector_Name => New_Occurrence_Of (Gen_Id, Loc))); |
| Set_Entity (Name (N2), Gen_Id); |
| |
| Rewrite (Name (N1), |
| Make_Expanded_Name (Loc, |
| Chars => Chars (Gen_Id), |
| Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc), |
| Selector_Name => New_Occurrence_Of (Gen_Id, Loc))); |
| |
| Set_Associated_Node (Name (N1), Name (N2)); |
| Set_Associated_Node (Prefix (Name (N1)), Empty); |
| Set_Associated_Node |
| (Selector_Name (Name (N1)), Selector_Name (Name (N2))); |
| Set_Etype (Name (N1), Etype (Gen_Id)); |
| end if; |
| |
| end Save_Global_Defaults; |
| |
| ---------------------------- |
| -- Save_Global_Descendant -- |
| ---------------------------- |
| |
| procedure Save_Global_Descendant (D : Union_Id) is |
| N1 : Node_Id; |
| |
| begin |
| if D in Node_Range then |
| if D = Union_Id (Empty) then |
| null; |
| |
| elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then |
| Save_References (Node_Id (D)); |
| end if; |
| |
| elsif D in List_Range then |
| if D = Union_Id (No_List) |
| or else Is_Empty_List (List_Id (D)) |
| then |
| null; |
| |
| else |
| N1 := First (List_Id (D)); |
| while Present (N1) loop |
| Save_References (N1); |
| Next (N1); |
| end loop; |
| end if; |
| |
| -- Element list or other non-node field, nothing to do |
| |
| else |
| null; |
| end if; |
| end Save_Global_Descendant; |
| |
| --------------------- |
| -- Save_References -- |
| --------------------- |
| |
| -- This is the recursive procedure that does the work, once the |
| -- enclosing generic scope has been established. We have to treat |
| -- specially a number of node rewritings that are required by semantic |
| -- processing and which change the kind of nodes in the generic copy: |
| -- typically constant-folding, replacing an operator node by a string |
| -- literal, or a selected component by an expanded name. In each of |
| -- those cases, the transformation is propagated to the generic unit. |
| |
| procedure Save_References (N : Node_Id) is |
| begin |
| if N = Empty then |
| null; |
| |
| elsif Nkind (N) = N_Character_Literal |
| or else Nkind (N) = N_Operator_Symbol |
| then |
| if Nkind (N) = Nkind (Get_Associated_Node (N)) then |
| Reset_Entity (N); |
| |
| elsif Nkind (N) = N_Operator_Symbol |
| and then Nkind (Get_Associated_Node (N)) = N_String_Literal |
| then |
| Change_Operator_Symbol_To_String_Literal (N); |
| end if; |
| |
| elsif Nkind (N) in N_Op then |
| |
| if Nkind (N) = Nkind (Get_Associated_Node (N)) then |
| |
| if Nkind (N) = N_Op_Concat then |
| Set_Is_Component_Left_Opnd (N, |
| Is_Component_Left_Opnd (Get_Associated_Node (N))); |
| |
| Set_Is_Component_Right_Opnd (N, |
| Is_Component_Right_Opnd (Get_Associated_Node (N))); |
| end if; |
| |
| Reset_Entity (N); |
| else |
| -- Node may be transformed into call to a user-defined operator |
| |
| N2 := Get_Associated_Node (N); |
| |
| if Nkind (N2) = N_Function_Call then |
| E := Entity (Name (N2)); |
| |
| if Present (E) |
| and then Is_Global (E) |
| then |
| Set_Etype (N, Etype (N2)); |
| else |
| Set_Associated_Node (N, Empty); |
| Set_Etype (N, Empty); |
| end if; |
| |
| elsif Nkind (N2) = N_Integer_Literal |
| or else Nkind (N2) = N_Real_Literal |
| or else Nkind (N2) = N_String_Literal |
| then |
| -- Operation was constant-folded, perform the same |
| -- replacement in generic. |
| |
| Rewrite (N, New_Copy (N2)); |
| Set_Analyzed (N, False); |
| |
| elsif Nkind (N2) = N_Identifier |
| and then Ekind (Entity (N2)) = E_Enumeration_Literal |
| then |
| -- Same if call was folded into a literal, but in this |
| -- case retain the entity to avoid spurious ambiguities |
| -- if id is overloaded at the point of instantiation or |
| -- inlining. |
| |
| Rewrite (N, New_Copy (N2)); |
| Set_Analyzed (N, False); |
| end if; |
| end if; |
| |
| -- Complete the check on operands, if node has not been |
| -- constant-folded. |
| |
| if Nkind (N) in N_Op then |
| Save_Entity_Descendants (N); |
| end if; |
| |
| elsif Nkind (N) = N_Identifier then |
| if Nkind (N) = Nkind (Get_Associated_Node (N)) then |
| |
| -- If this is a discriminant reference, always save it. |
| -- It is used in the instance to find the corresponding |
| -- discriminant positionally rather than by name. |
| |
| Set_Original_Discriminant |
| (N, Original_Discriminant (Get_Associated_Node (N))); |
| Reset_Entity (N); |
| |
| else |
| N2 := Get_Associated_Node (N); |
| |
| if Nkind (N2) = N_Function_Call then |
| E := Entity (Name (N2)); |
| |
| -- Name resolves to a call to parameterless function. |
| -- If original entity is global, mark node as resolved. |
| |
| if Present (E) |
| and then Is_Global (E) |
| then |
| Set_Etype (N, Etype (N2)); |
| else |
| Set_Associated_Node (N, Empty); |
| Set_Etype (N, Empty); |
| end if; |
| |
| elsif |
| Nkind (N2) = N_Integer_Literal or else |
| Nkind (N2) = N_Real_Literal or else |
| Nkind (N2) = N_String_Literal |
| then |
| -- Name resolves to named number that is constant-folded, |
| -- or to string literal from concatenation. |
| -- Perform the same replacement in generic. |
| |
| Rewrite (N, New_Copy (N2)); |
| Set_Analyzed (N, False); |
| |
| elsif Nkind (N2) = N_Explicit_Dereference then |
| |
| -- An identifier is rewritten as a dereference if it is |
| -- the prefix in a selected component, and it denotes an |
| -- access to a composite type, or a parameterless function |
| -- call that returns an access type. |
| |
| -- Check whether corresponding entity in prefix is global. |
| |
| if Is_Entity_Name (Prefix (N2)) |
| and then Present (Entity (Prefix (N2))) |
| and then Is_Global (Entity (Prefix (N2))) |
| then |
| Rewrite (N, |
| Make_Explicit_Dereference (Sloc (N), |
| Prefix => Make_Identifier (Sloc (N), |
| Chars => Chars (N)))); |
| Set_Associated_Node (Prefix (N), Prefix (N2)); |
| |
| elsif Nkind (Prefix (N2)) = N_Function_Call |
| and then Is_Global (Entity (Name (Prefix (N2)))) |
| then |
| Rewrite (N, |
| Make_Explicit_Dereference (Sloc (N), |
| Prefix => Make_Function_Call (Sloc (N), |
| Name => |
| Make_Identifier (Sloc (N), |
| Chars => Chars (N))))); |
| |
| Set_Associated_Node |
| (Name (Prefix (N)), Name (Prefix (N2))); |
| |
| else |
| Set_Associated_Node (N, Empty); |
| Set_Etype (N, Empty); |
| end if; |
| |
| -- The subtype mark of a nominally unconstrained object |
| -- is rewritten as a subtype indication using the bounds |
| -- of the expression. Recover the original subtype mark. |
| |
| elsif Nkind (N2) = N_Subtype_Indication |
| and then Is_Entity_Name (Original_Node (N2)) |
| then |
| Set_Associated_Node (N, Original_Node (N2)); |
| Reset_Entity (N); |
| |
| else |
| null; |
| end if; |
| end if; |
| |
| elsif Nkind (N) in N_Entity then |
| null; |
| |
| else |
| declare |
| use Atree.Unchecked_Access; |
| -- This code section is part of implementing an untyped tree |
| -- traversal, so it needs direct access to node fields. |
| |
| begin |
| if Nkind (N) = N_Aggregate |
| or else |
| Nkind (N) = N_Extension_Aggregate |
| then |
| N2 := Get_Associated_Node (N); |
| |
| if No (N2) |
| or else No (Etype (N2)) |
| or else not Is_Global (Etype (N2)) |
| then |
| Set_Associated_Node (N, Empty); |
| end if; |
| |
| Save_Global_Descendant (Field1 (N)); |
| Save_Global_Descendant (Field2 (N)); |
| Save_Global_Descendant (Field3 (N)); |
| Save_Global_Descendant (Field5 (N)); |
| |
| -- All other cases than aggregates |
| |
| else |
| Save_Global_Descendant (Field1 (N)); |
| Save_Global_Descendant (Field2 (N)); |
| Save_Global_Descendant (Field3 (N)); |
| Save_Global_Descendant (Field4 (N)); |
| Save_Global_Descendant (Field5 (N)); |
| end if; |
| end; |
| end if; |
| end Save_References; |
| |
| -- Start of processing for Save_Global_References |
| |
| begin |
| Gen_Scope := Current_Scope; |
| |
| -- If the generic unit is a child unit, references to entities in |
| -- the parent are treated as local, because they will be resolved |
| -- anew in the context of the instance of the parent. |
| |
| while Is_Child_Unit (Gen_Scope) |
| and then Ekind (Scope (Gen_Scope)) = E_Generic_Package |
| loop |
| Gen_Scope := Scope (Gen_Scope); |
| end loop; |
| |
| Save_References (N); |
| end Save_Global_References; |
| |
| -------------------------------------- |
| -- Set_Copied_Sloc_For_Inlined_Body -- |
| -------------------------------------- |
| |
| procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is |
| begin |
| Create_Instantiation_Source (N, E, True, S_Adjustment); |
| end Set_Copied_Sloc_For_Inlined_Body; |
| |
| --------------------- |
| -- Set_Instance_Of -- |
| --------------------- |
| |
| procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is |
| begin |
| Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null); |
| Generic_Renamings_HTable.Set (Generic_Renamings.Last); |
| Generic_Renamings.Increment_Last; |
| end Set_Instance_Of; |
| |
| -------------------- |
| -- Set_Next_Assoc -- |
| -------------------- |
| |
| procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is |
| begin |
| Generic_Renamings.Table (E).Next_In_HTable := Next; |
| end Set_Next_Assoc; |
| |
| ------------------- |
| -- Start_Generic -- |
| ------------------- |
| |
| procedure Start_Generic is |
| begin |
| -- ??? I am sure more things could be factored out in this |
| -- routine. Should probably be done at a later stage. |
| |
| Generic_Flags.Increment_Last; |
| Generic_Flags.Table (Generic_Flags.Last) := Inside_A_Generic; |
| Inside_A_Generic := True; |
| |
| Expander_Mode_Save_And_Set (False); |
| end Start_Generic; |
| |
| ---------------------- |
| -- Set_Instance_Env -- |
| ---------------------- |
| |
| procedure Set_Instance_Env |
| (Gen_Unit : Entity_Id; |
| Act_Unit : Entity_Id) |
| is |
| |
| begin |
| -- Regardless of the current mode, predefined units are analyzed in |
| -- the most current Ada mode, and earlier version Ada checks do not |
| -- apply to predefined units. |
| |
| if Is_Internal_File_Name |
| (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)), |
| Renamings_Included => True) then |
| Ada_Version := Ada_Version_Type'Last; |
| end if; |
| |
| Current_Instantiated_Parent := (Gen_Unit, Act_Unit, Assoc_Null); |
| end Set_Instance_Env; |
| |
| ----------------- |
| -- Switch_View -- |
| ----------------- |
| |
| procedure Switch_View (T : Entity_Id) is |
| BT : constant Entity_Id := Base_Type (T); |
| Priv_Elmt : Elmt_Id := No_Elmt; |
| Priv_Sub : Entity_Id; |
| |
| begin |
| -- T may be private but its base type may have been exchanged through |
| -- some other occurrence, in which case there is nothing to switch. |
| |
| if not Is_Private_Type (BT) then |
| return; |
| end if; |
| |
| Priv_Elmt := First_Elmt (Private_Dependents (BT)); |
| |
| if Present (Full_View (BT)) then |
| Append_Elmt (Full_View (BT), Exchanged_Views); |
| Exchange_Declarations (BT); |
| end if; |
| |
| while Present (Priv_Elmt) loop |
| Priv_Sub := (Node (Priv_Elmt)); |
| |
| -- We avoid flipping the subtype if the Etype of its full |
| -- view is private because this would result in a malformed |
| -- subtype. This occurs when the Etype of the subtype full |
| -- view is the full view of the base type (and since the |
| -- base types were just switched, the subtype is pointing |
| -- to the wrong view). This is currently the case for |
| -- tagged record types, access types (maybe more?) and |
| -- needs to be resolved. ??? |
| |
| if Present (Full_View (Priv_Sub)) |
| and then not Is_Private_Type (Etype (Full_View (Priv_Sub))) |
| then |
| Append_Elmt (Full_View (Priv_Sub), Exchanged_Views); |
| Exchange_Declarations (Priv_Sub); |
| end if; |
| |
| Next_Elmt (Priv_Elmt); |
| end loop; |
| end Switch_View; |
| |
| ----------------------------- |
| -- Valid_Default_Attribute -- |
| ----------------------------- |
| |
| procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is |
| Attr_Id : constant Attribute_Id := |
| Get_Attribute_Id (Attribute_Name (Def)); |
| T : constant Entity_Id := Entity (Prefix (Def)); |
| Is_Fun : constant Boolean := (Ekind (Nam) = E_Function); |
| F : Entity_Id; |
| Num_F : Int; |
| OK : Boolean; |
| |
| begin |
| if No (T) |
| or else T = Any_Id |
| then |
| return; |
| end if; |
| |
| Num_F := 0; |
| F := First_Formal (Nam); |
| while Present (F) loop |
| Num_F := Num_F + 1; |
| Next_Formal (F); |
| end loop; |
| |
| case Attr_Id is |
| when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign | |
| Attribute_Floor | Attribute_Fraction | Attribute_Machine | |
| Attribute_Model | Attribute_Remainder | Attribute_Rounding | |
| Attribute_Unbiased_Rounding => |
| OK := Is_Fun |
| and then Num_F = 1 |
| and then Is_Floating_Point_Type (T); |
| |
| when Attribute_Image | Attribute_Pred | Attribute_Succ | |
| Attribute_Value | Attribute_Wide_Image | |
| Attribute_Wide_Value => |
| OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T)); |
| |
| when Attribute_Max | Attribute_Min => |
| OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T)); |
| |
| when Attribute_Input => |
| OK := (Is_Fun and then Num_F = 1); |
| |
| when Attribute_Output | Attribute_Read | Attribute_Write => |
| OK := (not Is_Fun and then Num_F = 2); |
| |
| when others => |
| OK := False; |
| end case; |
| |
| if not OK then |
| Error_Msg_N ("attribute reference has wrong profile for subprogram", |
| Def); |
| end if; |
| end Valid_Default_Attribute; |
| |
| end Sem_Ch12; |