| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S E M _ C H 8 -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2004 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, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, USA. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Types; use Types; |
| package Sem_Ch8 is |
| |
| ----------------------------------- |
| -- Handling extensions of System -- |
| ----------------------------------- |
| |
| -- For targets that define a much larger System package than given in |
| -- the RM, we use a child package containing additional declarations, |
| -- which is loaded when needed, and whose entities are conceptually |
| -- within System itself. The presence of this auxiliary package is |
| -- controlled with the pragma Extend_System. The following variable |
| -- holds the entity of the auxiliary package, to simplify the special |
| -- visibility rules that apply to it. |
| |
| System_Aux_Id : Entity_Id := Empty; |
| |
| ----------------- |
| -- Subprograms -- |
| ----------------- |
| |
| procedure Analyze_Exception_Renaming (N : Node_Id); |
| procedure Analyze_Expanded_Name (N : Node_Id); |
| procedure Analyze_Generic_Function_Renaming (N : Node_Id); |
| procedure Analyze_Generic_Package_Renaming (N : Node_Id); |
| procedure Analyze_Generic_Procedure_Renaming (N : Node_Id); |
| procedure Analyze_Object_Renaming (N : Node_Id); |
| procedure Analyze_Package_Renaming (N : Node_Id); |
| procedure Analyze_Subprogram_Renaming (N : Node_Id); |
| procedure Analyze_Use_Package (N : Node_Id); |
| procedure Analyze_Use_Type (N : Node_Id); |
| |
| procedure End_Scope; |
| -- Called at end of scope. On exit from blocks and bodies (subprogram, |
| -- package, task, and protected bodies), the name of the current scope |
| -- must be removed from the scope stack, and the local entities must be |
| -- removed from their homonym chains. On exit from record declarations, |
| -- from package specifications, and from tasks and protected type |
| -- specifications, more specialized procedures are invoked. |
| |
| procedure End_Use_Clauses (Clause : Node_Id); |
| -- Invoked on scope exit, to undo the effect of local use clauses. Clause |
| -- is the first use-clause of a scope being exited. This can be the current |
| -- scope, or some enclosing scopes when building a clean environment to |
| -- compile an instance body for inlining. |
| |
| procedure End_Use_Package (N : Node_Id); |
| procedure End_Use_Type (N : Node_Id); |
| -- Subsidiaries of End_Use_Clauses. Also called directly for use clauses |
| -- appearing in context clauses. |
| |
| procedure Find_Direct_Name (N : Node_Id); |
| -- Given a direct name (Identifier or Operator_Symbol), this routine |
| -- scans the homonym chain for the name searching for corresponding |
| -- visible entities to find the referenced entity (or in the case of |
| -- overloading), entities. On return, the Entity, and Etype fields |
| -- are set. In the non-overloaded case, these are the correct final |
| -- entries. In the overloaded case, Is_Overloaded is set, Etype and |
| -- Entity refer to an arbitrary element of the overloads set, and |
| -- an appropriate list of entries has been made in the overload |
| -- interpretation table (to be disambiguated in the resolve phase). |
| |
| procedure Find_Selected_Component (N : Node_Id); |
| -- Resolve various cases of selected components, recognize expanded names |
| |
| procedure Find_Type (N : Node_Id); |
| -- Perform name resolution, and verify that the name found is that of a |
| -- type. On return the Entity and Etype fields of the node N are set |
| -- appropriately. If it is an incomplete type whose full declaration has |
| -- been seen, they are set to the entity in the full declaration. |
| -- Similarly, if the type is private, it has received a full declaration, |
| -- and we are in the private part or body of the package, then the two |
| -- fields are set to the entity of the full declaration as well. This |
| -- procedure also provides special processing for Class types as well. |
| |
| function Get_Full_View (T_Name : Entity_Id) return Entity_Id; |
| -- If T_Name is an incomplete type and the full declaration has been |
| -- seen, or is the name of a class_wide type whose root is incomplete. |
| -- return the corresponding full declaration. |
| |
| procedure Initialize; |
| -- Initializes data structures used for visibility analysis. Must be |
| -- called before analyzing each new main source program. |
| |
| procedure Install_Use_Clauses |
| (Clause : Node_Id; |
| Force_Installation : Boolean := False); |
| -- Applies the use clauses appearing in a given declarative part, |
| -- when the corresponding scope has been placed back on the scope |
| -- stack after unstacking to compile a different context (subunit or |
| -- parent of generic body). Force_Installation is used when called from |
| -- Analyze_Subunit.Re_Install_Use_Clauses to insure that, after the |
| -- analysis of the subunit, the parent's environment is again identical. |
| |
| function In_Open_Scopes (S : Entity_Id) return Boolean; |
| -- S is the entity of a scope. This function determines if this scope |
| -- is currently open (i.e. it appears somewhere in the scope stack). |
| |
| procedure New_Scope (S : Entity_Id); |
| -- Make new scope stack entry, pushing S, the entity for a scope |
| -- onto the top of the scope table. The current setting of the scope |
| -- suppress flags is saved for restoration on exit. |
| |
| procedure Pop_Scope; |
| -- Remove top entry from scope stack, restoring the saved setting |
| -- of the scope suppress flags. |
| |
| function Present_System_Aux (N : Node_Id := Empty) return Boolean; |
| -- Return True if the auxiliary system file has been successfully loaded. |
| -- Otherwise attempt to load it, using the name supplied by a previous |
| -- Extend_System pragma, and report on the success of the load. |
| -- If N is present, it is a selected component whose prefix is System, |
| -- or else a with-clause on system. N is absent when the function is |
| -- called to find the visibility of implicit operators. |
| |
| procedure Restore_Scope_Stack (Handle_Use : Boolean := True); |
| procedure Save_Scope_Stack (Handle_Use : Boolean := True); |
| -- These two procedures are called from Semantics, when a unit U1 is |
| -- to be compiled in the course of the compilation of another unit U2. |
| -- This happens whenever Rtsfind is called. U1, the unit retrieved by |
| -- Rtsfind, must be compiled in its own context, and the current scope |
| -- stack containing U2 and local scopes must be made unreachable. On |
| -- return, the contents of the scope stack must be made accessible again. |
| -- The flag Handle_Use indicates whether local use clauses must be |
| -- removed/installed. In the case of inlining of instance bodies, the |
| -- visiblity handling is done fully in Inline_Instance_Body, and use |
| -- clauses are handled there. |
| |
| procedure Set_Use (L : List_Id); |
| -- Find use clauses that are declarative items in a package declaration |
| -- and set the potentially use-visible flags of imported entities before |
| -- analyzing the corresponding package body. |
| |
| end Sem_Ch8; |