145 lines
7.7 KiB
Ada
145 lines
7.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S E M _ C A T --
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-- --
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-- S p e c --
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-- --
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-- $Revision: 1.14 $
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-- --
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-- Copyright (C) 1992-2000 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This unit contains the routines used for checking for conformance with
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-- the semantic restrictions required for the categorization pragmas:
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--
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-- Preelaborate
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-- Pure,
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-- Remote_Call_Interface
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-- Remote_Types
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-- Shared_Passive
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--
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-- Note that we treat Preelaborate as a categorization pragma, even though
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-- strictly, according to RM E.2(2,3), the term does not apply in this case.
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with Types; use Types;
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package Sem_Cat is
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function In_Preelaborated_Unit return Boolean;
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-- Determines if the current scope is within a preelaborated compilation
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-- unit, that is one to which one of the pragmas Preelaborate, Pure,
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-- Shared_Passive, Remote_Types, or inside a unit other than a package
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-- body with pragma Remote_Call_Interface.
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function In_Pure_Unit return Boolean;
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pragma Inline (In_Pure_Unit);
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-- Determines if the current scope is within pure compilation unit,
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-- that is, one to which the pragmas Pure is applied.
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function In_Subprogram_Task_Protected_Unit return Boolean;
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-- Determines if the current scope is within a subprogram, task
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-- or protected unit. Used to validate if the library unit is Pure
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-- (RM 10.2.1(16)).
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procedure Set_Categorization_From_Pragmas (N : Node_Id);
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-- Since validation of categorization dependency is done during analyze
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-- so categorization flags from following pragmas should be set before
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-- validation begin. N is the N_Compilation_Unit node.
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procedure Validate_Access_Type_Declaration (T : Entity_Id; N : Node_Id);
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-- Validate all constraints against declaration of access types in
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-- categorized library units. Usually this is a violation in Pure unit,
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-- Shared_Passive unit. N is the declaration node.
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procedure Validate_Ancestor_Part (N : Node_Id);
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-- Checks that a type given as the ancestor in an extension aggregate
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-- satisfies the restriction of 10.2.1(9).
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procedure Validate_Categorization_Dependency (N : Node_Id; E : Entity_Id);
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-- There are restrictions on lib unit that semantically depends on other
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-- units (RM E.2(5), 10.2.1(11). This procedure checks the restrictions
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-- on categorizations. N is the current unit node, and E is the current
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-- library unit entity.
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procedure Validate_Controlled_Object (E : Entity_Id);
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-- Given an entity for a library level controlled object, check that it is
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-- not in a preelaborated unit (prohibited by RM 10.2.1(9)).
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procedure Validate_Null_Statement_Sequence (N : Node_Id);
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-- Given N, a package body node, check that a handled statement sequence
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-- in a preelaborable body contains no statements other than labels or
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-- null statements, as required by RM 10.2.1(6).
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procedure Validate_Object_Declaration (N : Node_Id);
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-- Given N, an object declaration node, validates all the constraints in
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-- a preelaborable library unit, including creation of task objects etc.
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-- Note that this is called when the corresponding object is frozen since
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-- the checks cannot be made before knowing if the object is imported.
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procedure Validate_RCI_Declarations (P : Entity_Id);
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-- Apply semantic checks given in E2.3(10-14).
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procedure Validate_RCI_Subprogram_Declaration (N : Node_Id);
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-- Check for RCI unit subprogram declarations with respect to
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-- in-lined subprogram and subprogram with access parameter or
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-- limited type parameter without Read and Write.
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procedure Validate_Remote_Access_To_Class_Wide_Type (N : Node_Id);
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-- Checks that Storage_Pool and Storage_Size attribute references are
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-- not applied to remote access-to-class-wide types. And the expected
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-- type for an allocator shall not be a remote access-to-class-wide
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-- type. And a remote access-to-class-wide type shall not be an actual
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-- parameter for a generic formal access type. RM E.2.3(22).
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procedure Validate_Remote_Access_To_Subprogram_Type (N : Node_Id);
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-- Checks that a remote access to subprogram type does not have a
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-- parameter of an access type. This is not strictly forbidden at this
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-- time, but this is useless, as such a RAS type will not be usable
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-- per E.2.2(12) and E.2.3(14).
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procedure Validate_RT_RAT_Component (N : Node_Id);
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-- Given N, the package library unit declaration node, we should check
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-- against RM:9.95 E.2.2(8): the full view of a type declared in the
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-- visible part of a Remote Types unit has a part that is of a non-remote
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-- access type which has no read/write.
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procedure Validate_Remote_Type_Type_Conversion (N : Node_Id);
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-- Check for remote-type type conversion constraints. First, a value of
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-- a remote access-to-subprogram type can be converted only to another
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-- type conformant remote access-to-subprogram type. Secondly, a value
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-- of a remote access-to-class-wide type can be converted only to another
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-- remote access-to-class-wide type (RM E.2.3(17,20)).
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procedure Validate_SP_Access_Object_Type_Decl (T : Entity_Id);
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-- Check validity of declaration if shared passive unit. It should not
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-- contain the declaration of an access-to-object type whose designated
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-- type is a class-wide type ,task type or protected type. E.2.1(7).
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-- T is the entity of the declared type.
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procedure Validate_Static_Object_Name (N : Node_Id);
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-- In the elaboration code of a preelaborated library unit, check
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-- that we do not have the evaluation of a primary that is a name of
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-- an object, unless the name is a static expression (RM 10.2.1(8)).
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-- Non-static constant and variable are the targets, generic parameters
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-- are not included because the generic declaration and body are
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-- preelaborable.
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end Sem_Cat;
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