| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . R I D E N T -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- 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, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This package defines the set of restriction identifiers. It is a generic |
| -- package that is instantiated by the compiler/binder in package Rident, and |
| -- is instantiated in package System.Restrictions for use at run-time. |
| |
| -- The reason that we make this a generic package is so that in the case of |
| -- the instantiation in Rident for use at compile time and bind time, we can |
| -- generate normal image tables for the enumeration types, which are needed |
| -- for diagnostic and informational messages. At run-time we really do not |
| -- want to waste the space for these image tables, and they are not needed, |
| -- so we can do the instantiation under control of Discard_Names to remove |
| -- the tables. |
| |
| generic |
| package System.Rident is |
| |
| -- The following enumeration type defines the set of restriction |
| -- identifiers that are implemented in GNAT. |
| |
| -- To add a new restriction identifier, add an entry with the name |
| -- to be used in the pragma, and add appropriate calls to the |
| -- Restrict.Check_Restriction routine. |
| |
| type Restriction_Id is |
| |
| -- The following cases are checked for consistency in the binder |
| |
| (Simple_Barriers, -- GNAT (Ravenscar) |
| No_Abort_Statements, -- (RM D.7(5), H.4(3)) |
| No_Access_Subprograms, -- (RM H.4(17)) |
| No_Allocators, -- (RM H.4(7)) |
| No_Asynchronous_Control, -- (RM D.7(10)) |
| No_Calendar, -- GNAT |
| No_Delay, -- (RM H.4(21)) |
| No_Direct_Boolean_Operators, -- GNAT |
| No_Dispatch, -- (RM H.4(19)) |
| No_Dispatching_Calls, -- GNAT |
| No_Dynamic_Attachment, -- GNAT |
| No_Dynamic_Priorities, -- (RM D.9(9)) |
| No_Enumeration_Maps, -- GNAT |
| No_Entry_Calls_In_Elaboration_Code, -- GNAT |
| No_Entry_Queue, -- GNAT (Ravenscar) |
| No_Exception_Handlers, -- GNAT |
| No_Exception_Registration, -- GNAT |
| No_Exceptions, -- (RM H.4(12)) |
| No_Finalization, -- GNAT |
| No_Fixed_Point, -- (RM H.4(15)) |
| No_Floating_Point, -- (RM H.4(14)) |
| No_IO, -- (RM H.4(20)) |
| No_Implicit_Conditionals, -- GNAT |
| No_Implicit_Dynamic_Code, -- GNAT |
| No_Implicit_Heap_Allocations, -- (RM D.8(8), H.4(3)) |
| No_Implicit_Loops, -- GNAT |
| No_Initialize_Scalars, -- GNAT |
| No_Local_Allocators, -- (RM H.4(8)) |
| No_Local_Protected_Objects, -- GNAT |
| No_Nested_Finalization, -- (RM D.7(4)) |
| No_Protected_Type_Allocators, -- GNAT |
| No_Protected_Types, -- (RM H.4(5)) |
| No_Recursion, -- (RM H.4(22)) |
| No_Reentrancy, -- (RM H.4(23)) |
| No_Relative_Delay, -- GNAT (Ravenscar) |
| No_Requeue_Statements, -- GNAT |
| No_Secondary_Stack, -- GNAT |
| No_Select_Statements, -- GNAT (Ravenscar) |
| No_Standard_Storage_Pools, -- GNAT |
| No_Streams, -- GNAT |
| No_Task_Allocators, -- (RM D.7(7)) |
| No_Task_Attributes_Package, -- GNAT |
| No_Task_Hierarchy, -- (RM D.7(3), H.4(3)) |
| No_Task_Termination, -- GNAT (Ravenscar) |
| No_Tasking, -- GNAT |
| No_Terminate_Alternatives, -- (RM D.7(6)) |
| No_Unchecked_Access, -- (RM H.4(18)) |
| No_Unchecked_Conversion, -- (RM H.4(16)) |
| No_Unchecked_Deallocation, -- (RM H.4(9)) |
| Static_Priorities, -- GNAT |
| Static_Storage_Size, -- GNAT |
| |
| -- The following cases do not require partition-wide checks |
| |
| Immediate_Reclamation, -- (RM H.4(10)) |
| No_Implementation_Attributes, -- Ada 2005 AI-257 |
| No_Implementation_Pragmas, -- Ada 2005 AI-257 |
| No_Implementation_Restrictions, -- GNAT |
| No_Elaboration_Code, -- GNAT |
| No_Obsolescent_Features, -- Ada 2005 AI-368 |
| No_Wide_Characters, -- GNAT |
| |
| -- The following cases require a parameter value |
| |
| -- The following entries are fully checked at compile/bind time, |
| -- which means that the compiler can in general tell the minimum |
| -- value which could be used with a restrictions pragma. The binder |
| -- can deduce the appropriate minimum value for the partition by |
| -- taking the maximum value required by any unit. |
| |
| Max_Protected_Entries, -- (RM D.7(14)) |
| Max_Select_Alternatives, -- (RM D.7(12)) |
| Max_Task_Entries, -- (RM D.7(13), H.4(3)) |
| |
| -- The following entries are also fully checked at compile/bind |
| -- time, and the compiler can also at least in some cases tell |
| -- the minimum value which could be used with a restriction pragma. |
| -- The difference is that the contributions are additive, so the |
| -- binder deduces this value by adding the unit contributions. |
| |
| Max_Tasks, -- (RM D.7(19), H.4(3)) |
| |
| -- The following entries are checked at compile time only for |
| -- zero/nonzero entries. This means that the compiler can tell |
| -- at compile time if a restriction value of zero is (would be) |
| -- violated, but that is all. The compiler cannot distinguish |
| -- between different non-zero values. |
| |
| Max_Asynchronous_Select_Nesting, -- (RM D.7(18), H.4(3)) |
| Max_Entry_Queue_Length, -- GNAT |
| |
| -- The remaining entries are not checked at compile/bind time |
| |
| Max_Storage_At_Blocking, -- (RM D.7(17)) |
| |
| Not_A_Restriction_Id); |
| |
| -- Synonyms permitted for historical purposes of compatibility. |
| -- Must be coordinated with Restrict.Process_Restriction_Synonym. |
| |
| Boolean_Entry_Barriers : Restriction_Id renames Simple_Barriers; |
| Max_Entry_Queue_Depth : Restriction_Id renames Max_Entry_Queue_Length; |
| No_Dynamic_Interrupts : Restriction_Id renames No_Dynamic_Attachment; |
| No_Requeue : Restriction_Id renames No_Requeue_Statements; |
| No_Task_Attributes : Restriction_Id renames No_Task_Attributes_Package; |
| |
| subtype All_Restrictions is Restriction_Id range |
| Simple_Barriers .. Max_Storage_At_Blocking; |
| -- All restrictions (excluding only Not_A_Restriction_Id) |
| |
| subtype All_Boolean_Restrictions is Restriction_Id range |
| Simple_Barriers .. No_Wide_Characters; |
| -- All restrictions which do not take a parameter |
| |
| subtype Partition_Boolean_Restrictions is All_Boolean_Restrictions range |
| Simple_Barriers .. Static_Storage_Size; |
| -- Boolean restrictions that are checked for partition consistency. |
| -- Note that all parameter restrictions are checked for partition |
| -- consistency by default, so this distinction is only needed in the |
| -- case of Boolean restrictions. |
| |
| subtype Cunit_Boolean_Restrictions is All_Boolean_Restrictions range |
| Immediate_Reclamation .. No_Wide_Characters; |
| -- Boolean restrictions that are not checked for partition consistency |
| -- and that thus apply only to the current unit. Note that for these |
| -- restrictions, the compiler does not apply restrictions found in |
| -- with'ed units, parent specs etc to the main unit. |
| |
| subtype All_Parameter_Restrictions is |
| Restriction_Id range |
| Max_Protected_Entries .. Max_Storage_At_Blocking; |
| -- All restrictions that are take a parameter |
| |
| subtype Checked_Parameter_Restrictions is |
| All_Parameter_Restrictions range |
| Max_Protected_Entries .. Max_Entry_Queue_Length; |
| -- These are the parameter restrictions that can be at least partially |
| -- checked at compile/binder time. Minimally, the compiler can detect |
| -- violations of a restriction pragma with a value of zero reliably. |
| |
| subtype Checked_Max_Parameter_Restrictions is |
| Checked_Parameter_Restrictions range |
| Max_Protected_Entries .. Max_Task_Entries; |
| -- Restrictions with parameters that can be checked in some cases by |
| -- maximizing among statically detected instances where the compiler |
| -- can determine the count. |
| |
| subtype Checked_Add_Parameter_Restrictions is |
| Checked_Parameter_Restrictions range |
| Max_Tasks .. Max_Tasks; |
| -- Restrictions with parameters that can be checked in some cases by |
| -- summing the statically detected instances where the compiler can |
| -- determine the count. |
| |
| subtype Checked_Val_Parameter_Restrictions is |
| Checked_Parameter_Restrictions range |
| Max_Protected_Entries .. Max_Tasks; |
| -- Restrictions with parameter where the count is known at least in |
| -- some cases by the compiler/binder. |
| |
| subtype Checked_Zero_Parameter_Restrictions is |
| Checked_Parameter_Restrictions range |
| Max_Asynchronous_Select_Nesting .. Max_Entry_Queue_Length; |
| -- Restrictions with parameters where the compiler can detect the use of |
| -- the feature, and hence violations of a restriction specifying a value |
| -- of zero, but cannot detect specific values other than zero/nonzero. |
| |
| subtype Unchecked_Parameter_Restrictions is |
| All_Parameter_Restrictions range |
| Max_Storage_At_Blocking .. Max_Storage_At_Blocking; |
| -- Restrictions with parameters where the compiler cannot ever detect |
| -- corresponding compile time usage, so the binder and compiler never |
| -- detect violations of any restriction. |
| |
| ------------------------------------- |
| -- Restriction Status Declarations -- |
| ------------------------------------- |
| |
| -- The following declarations are used to record the current status |
| -- or restrictions (for the current unit, or related units, at compile |
| -- time, and for all units in a partition at bind time or run time). |
| |
| type Restriction_Flags is array (All_Restrictions) of Boolean; |
| type Restriction_Values is array (All_Parameter_Restrictions) of Natural; |
| type Parameter_Flags is array (All_Parameter_Restrictions) of Boolean; |
| |
| type Restrictions_Info is record |
| Set : Restriction_Flags := (others => False); |
| -- An entry is True in the Set array if a restrictions pragma has |
| -- been encountered for the given restriction. If the value is |
| -- True for a parameter restriction, then the corresponding entry |
| -- in the Value array gives the minimum value encountered for any |
| -- such restriction. |
| |
| Value : Restriction_Values; |
| -- If the entry for a parameter restriction in Set is True (i.e. a |
| -- restrictions pragma for the restriction has been encountered), then |
| -- the corresponding entry in the Value array is the minimum value |
| -- specified by any such restrictions pragma. Note that a restrictions |
| -- pragma specifying a value greater than Int'Last is simply ignored. |
| |
| Violated : Restriction_Flags := (others => False); |
| -- An entry is True in the violations array if the compiler has |
| -- detected a violation of the restriction. For a parameter |
| -- restriction, the Count and Unknown arrays have additional |
| -- information. |
| |
| Count : Restriction_Values := (others => 0); |
| -- If an entry for a parameter restriction is True in Violated, |
| -- the corresponding entry in the Count array may record additional |
| -- information. If the actual minimum count is known (by taking |
| -- maximums, or sums, depending on the restriction), it will be |
| -- recorded in this array. If not, then the value will remain zero. |
| |
| Unknown : Parameter_Flags := (others => False); |
| -- If an entry for a parameter restriction is True in Violated, |
| -- the corresponding entry in the Unknown array may record additional |
| -- information. If the actual count is not known by the compiler (but |
| -- is known to be non-zero), then the entry in Unknown will be True. |
| -- This indicates that the value in Count is not known to be exact, |
| -- and the actual violation count may be higher. |
| |
| -- Note: If Violated (K) is True, then either Count (K) > 0 or |
| -- Unknown (K) = True. It is possible for both these to be set. |
| -- For example, if Count (K) = 3 and Unknown (K) is True, it means |
| -- that the actual violation count is at least 3 but might be higher. |
| end record; |
| |
| ---------------------------------- |
| -- Profile Definitions and Data -- |
| ---------------------------------- |
| |
| type Profile_Name is (Ravenscar, Restricted); |
| -- Names of recognized pfofiles |
| |
| type Profile_Data is record |
| Set : Restriction_Flags; |
| -- Set to True if given restriction must be set for the profile, |
| -- and False if it need not be set (False does not mean that it |
| -- must not be set, just that it need not be set). If the flag |
| -- is True for a parameter restriction, then the Value array |
| -- gives the maximum value permitted by the profile. |
| |
| Value : Restriction_Values; |
| -- An entry in this array is meaningful only if the corresponding |
| -- flag in Set is True. In that case, the value in this array is |
| -- the maximum value of the parameter permitted by the profile. |
| end record; |
| |
| Profile_Info : array (Profile_Name) of Profile_Data := |
| |
| -- Restricted Profile |
| |
| (Restricted => |
| |
| -- Restrictions for Restricted profile |
| |
| (Set => |
| (No_Abort_Statements => True, |
| No_Asynchronous_Control => True, |
| No_Dynamic_Attachment => True, |
| No_Dynamic_Priorities => True, |
| No_Entry_Queue => True, |
| No_Local_Protected_Objects => True, |
| No_Protected_Type_Allocators => True, |
| No_Requeue_Statements => True, |
| No_Task_Allocators => True, |
| No_Task_Attributes_Package => True, |
| No_Task_Hierarchy => True, |
| No_Terminate_Alternatives => True, |
| Max_Asynchronous_Select_Nesting => True, |
| Max_Protected_Entries => True, |
| Max_Select_Alternatives => True, |
| Max_Task_Entries => True, |
| others => False), |
| |
| -- Value settings for Restricted profile |
| |
| Value => |
| (Max_Asynchronous_Select_Nesting => 0, |
| Max_Protected_Entries => 1, |
| Max_Select_Alternatives => 0, |
| Max_Task_Entries => 0, |
| others => 0)), |
| |
| -- Ravenscar Profile |
| |
| -- Note: the table entries here only represent the |
| -- required restriction profile for Ravenscar. The |
| -- full Ravenscar profile also requires: |
| |
| -- pragma Dispatching_Policy (FIFO_Within_Priorities); |
| -- pragma Locking_Policy (Ceiling_Locking); |
| -- pragma Detect_Blocking |
| |
| Ravenscar => |
| |
| -- Restrictions for Ravenscar = Restricted profile .. |
| |
| (Set => |
| (No_Abort_Statements => True, |
| No_Asynchronous_Control => True, |
| No_Dynamic_Attachment => True, |
| No_Dynamic_Priorities => True, |
| No_Entry_Queue => True, |
| No_Local_Protected_Objects => True, |
| No_Protected_Type_Allocators => True, |
| No_Requeue_Statements => True, |
| No_Task_Allocators => True, |
| No_Task_Attributes_Package => True, |
| No_Task_Hierarchy => True, |
| No_Terminate_Alternatives => True, |
| Max_Asynchronous_Select_Nesting => True, |
| Max_Protected_Entries => True, |
| Max_Select_Alternatives => True, |
| Max_Task_Entries => True, |
| |
| -- plus these additional restrictions: |
| |
| No_Calendar => True, |
| No_Implicit_Heap_Allocations => True, |
| No_Relative_Delay => True, |
| No_Select_Statements => True, |
| No_Task_Termination => True, |
| Simple_Barriers => True, |
| others => False), |
| |
| -- Value settings for Ravenscar (same as Restricted) |
| |
| Value => |
| (Max_Asynchronous_Select_Nesting => 0, |
| Max_Protected_Entries => 1, |
| Max_Select_Alternatives => 0, |
| Max_Task_Entries => 0, |
| others => 0))); |
| |
| end System.Rident; |