2057 lines
72 KiB
Ada
2057 lines
72 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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-- B o d y --
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-- --
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-- Copyright (C) 1992-2006, 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, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, 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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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Atree; use Atree;
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with Debug; use Debug;
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with Einfo; use Einfo;
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with Elists; use Elists;
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with Errout; use Errout;
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with Fname; use Fname;
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with Lib; use Lib;
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with Nlists; use Nlists;
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with Opt; use Opt;
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with Sem; use Sem;
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with Sem_Eval; use Sem_Eval;
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with Sem_Util; use Sem_Util;
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with Sinfo; use Sinfo;
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with Snames; use Snames;
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with Stand; use Stand;
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package body Sem_Cat is
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure Check_Categorization_Dependencies
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(Unit_Entity : Entity_Id;
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Depended_Entity : Entity_Id;
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Info_Node : Node_Id;
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Is_Subunit : Boolean);
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-- This procedure checks that the categorization of a lib unit and that
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-- of the depended unit satisfy dependency restrictions.
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-- The depended_entity can be the entity in a with_clause item, in which
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-- case Info_Node denotes that item. The depended_entity can also be the
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-- parent unit of a child unit, in which case Info_Node is the declaration
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-- of the child unit. The error message is posted on Info_Node, and is
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-- specialized if Is_Subunit is true.
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procedure Check_Non_Static_Default_Expr
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(Type_Def : Node_Id;
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Obj_Decl : Node_Id);
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-- Iterate through the component list of a record definition, check
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-- that no component is declared with a nonstatic default value.
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-- If a nonstatic default exists, report an error on Obj_Decl.
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-- Iterate through the component list of a record definition, check
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-- that no component is declared with a non-static default value.
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function Missing_Read_Write_Attributes (E : Entity_Id) return Boolean;
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-- Return True if the entity or one of its subcomponent is an access
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-- type which does not have user-defined Read and Write attribute.
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-- Additionally, in Ada 2005 mode, stream attributes are considered missing
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-- if the attribute definition clause is not visible.
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function In_RCI_Declaration (N : Node_Id) return Boolean;
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-- Determines if a declaration is within the visible part of a Remote
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-- Call Interface compilation unit, for semantic checking purposes only,
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-- (returns false within an instance and within the package body).
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function In_RT_Declaration return Boolean;
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-- Determines if current scope is within a Remote Types compilation unit,
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-- for semantic checking purposes.
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function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean;
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-- Returns true if the entity is a type whose full view is a non-remote
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-- access type, for the purpose of enforcing E.2.2(8) rules.
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function In_Shared_Passive_Unit return Boolean;
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-- Determines if current scope is within a Shared Passive compilation unit
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function Static_Discriminant_Expr (L : List_Id) return Boolean;
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-- Iterate through the list of discriminants to check if any of them
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-- contains non-static default expression, which is a violation in
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-- a preelaborated library unit.
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procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id);
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-- Check validity of declaration if RCI or RT unit. It should not contain
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-- the declaration of an access-to-object type unless it is a
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-- general access type that designates a class-wide limited
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-- private type. There are also constraints about the primitive
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-- subprograms of the class-wide type. RM E.2 (9, 13, 14)
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function Is_Recursively_Limited_Private (E : Entity_Id) return Boolean;
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-- Return True if E is a limited private type, or if E is a private
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-- extension of a type whose parent verifies this property (hence the
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-- recursive keyword).
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---------------------------------------
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-- Check_Categorization_Dependencies --
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---------------------------------------
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procedure Check_Categorization_Dependencies
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(Unit_Entity : Entity_Id;
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Depended_Entity : Entity_Id;
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Info_Node : Node_Id;
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Is_Subunit : Boolean)
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is
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N : constant Node_Id := Info_Node;
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-- Here we define an enumeration type to represent categorization
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-- types, ordered so that a unit with a given categorization can
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-- only WITH units with lower or equal categorization type.
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type Categorization is
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(Pure,
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Shared_Passive,
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Remote_Types,
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Remote_Call_Interface,
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Preelaborated,
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Normal);
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Unit_Category : Categorization;
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With_Category : Categorization;
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function Get_Categorization (E : Entity_Id) return Categorization;
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-- Check categorization flags from entity, and return in the form
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-- of a corresponding enumeration value.
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------------------------
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-- Get_Categorization --
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------------------------
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function Get_Categorization (E : Entity_Id) return Categorization is
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begin
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if Is_Preelaborated (E) then
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return Preelaborated;
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-- Ignore Pure specification if set by pragma Pure_Function
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elsif Is_Pure (E)
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and then not
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(Has_Pragma_Pure_Function (E) and not Has_Pragma_Pure (E))
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then
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return Pure;
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elsif Is_Shared_Passive (E) then
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return Shared_Passive;
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elsif Is_Remote_Types (E) then
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return Remote_Types;
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elsif Is_Remote_Call_Interface (E) then
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return Remote_Call_Interface;
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else
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return Normal;
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end if;
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end Get_Categorization;
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-- Start of processing for Check_Categorization_Dependencies
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begin
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-- Intrinsic subprograms are preelaborated, so do not impose any
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-- categorization dependencies.
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if Is_Intrinsic_Subprogram (Depended_Entity) then
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return;
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end if;
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Unit_Category := Get_Categorization (Unit_Entity);
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With_Category := Get_Categorization (Depended_Entity);
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-- These messages are wanings in GNAT mode, to allow it to be
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-- judiciously turned off. Otherwise it is a real error.
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Error_Msg_Warn := GNAT_Mode;
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-- Check for possible error
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if With_Category > Unit_Category then
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-- Special case: Remote_Types and Remote_Call_Interface are allowed
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-- to be with'ed in package body.
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if (Unit_Category = Remote_Types
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or else Unit_Category = Remote_Call_Interface)
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and then In_Package_Body (Unit_Entity)
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then
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null;
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-- Here we have an error
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else
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if Is_Subunit then
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Error_Msg_NE
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("<subunit cannot depend on& " &
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"(parent has wrong categorization)", N, Depended_Entity);
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else
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Error_Msg_NE
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("<cannot depend on& " &
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"(wrong categorization)", N, Depended_Entity);
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end if;
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-- Add further explanation for common cases
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case Unit_Category is
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when Pure =>
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Error_Msg_NE
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("\<pure unit cannot depend on non-pure unit",
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N, Depended_Entity);
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when Preelaborated =>
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Error_Msg_NE
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("\<preelaborated unit cannot depend on " &
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"non-preelaborated unit",
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N, Depended_Entity);
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when others =>
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null;
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end case;
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end if;
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end if;
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end Check_Categorization_Dependencies;
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-----------------------------------
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-- Check_Non_Static_Default_Expr --
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-----------------------------------
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procedure Check_Non_Static_Default_Expr
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(Type_Def : Node_Id;
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Obj_Decl : Node_Id)
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is
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Recdef : Node_Id;
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Component_Decl : Node_Id;
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begin
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if Nkind (Type_Def) = N_Derived_Type_Definition then
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Recdef := Record_Extension_Part (Type_Def);
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if No (Recdef) then
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return;
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end if;
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else
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Recdef := Type_Def;
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end if;
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-- Check that component declarations do not involve:
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-- a. a non-static default expression, where the object is
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-- declared to be default initialized.
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-- b. a dynamic Itype (discriminants and constraints)
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if Null_Present (Recdef) then
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return;
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else
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Component_Decl := First (Component_Items (Component_List (Recdef)));
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end if;
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while Present (Component_Decl)
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and then Nkind (Component_Decl) = N_Component_Declaration
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loop
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if Present (Expression (Component_Decl))
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and then Nkind (Expression (Component_Decl)) /= N_Null
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and then not Is_Static_Expression (Expression (Component_Decl))
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then
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Error_Msg_Sloc := Sloc (Component_Decl);
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Error_Msg_F
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("object in preelaborated unit has non-static default#",
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Obj_Decl);
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-- Fix this later ???
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-- elsif Has_Dynamic_Itype (Component_Decl) then
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-- Error_Msg_N
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-- ("dynamic type discriminant," &
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-- " constraint in preelaborated unit",
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-- Component_Decl);
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end if;
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Next (Component_Decl);
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end loop;
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end Check_Non_Static_Default_Expr;
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-------------------------------------
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-- Has_Stream_Attribute_Definition --
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-------------------------------------
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function Has_Stream_Attribute_Definition
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(Typ : Entity_Id; Nam : TSS_Name_Type) return Boolean
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is
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Rep_Item : Node_Id;
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begin
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-- We start from the declaration node and then loop until the end of
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-- the list until we find the requested attribute definition clause.
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-- In Ada 2005 mode, clauses are ignored if they are not currently
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-- visible (this is tested using the corresponding Entity, which is
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-- inserted by the expander at the point where the clause occurs).
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Rep_Item := First_Rep_Item (Typ);
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while Present (Rep_Item) loop
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if Nkind (Rep_Item) = N_Attribute_Definition_Clause then
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case Chars (Rep_Item) is
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when Name_Read =>
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exit when Nam = TSS_Stream_Read;
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when Name_Write =>
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exit when Nam = TSS_Stream_Write;
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when Name_Input =>
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exit when Nam = TSS_Stream_Input;
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when Name_Output =>
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exit when Nam = TSS_Stream_Output;
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when others =>
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null;
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end case;
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end if;
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Next_Rep_Item (Rep_Item);
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end loop;
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return Present (Rep_Item)
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and then (Ada_Version < Ada_05
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or else not Is_Hidden (Entity (Rep_Item)));
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end Has_Stream_Attribute_Definition;
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---------------------------
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-- In_Preelaborated_Unit --
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---------------------------
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function In_Preelaborated_Unit return Boolean is
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Unit_Entity : constant Entity_Id := Current_Scope;
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Unit_Kind : constant Node_Kind :=
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Nkind (Unit (Cunit (Current_Sem_Unit)));
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begin
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-- There are no constraints on body of remote_call_interface or
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-- remote_types packages.
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return (Unit_Entity /= Standard_Standard)
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and then (Is_Preelaborated (Unit_Entity)
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or else Is_Pure (Unit_Entity)
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or else Is_Shared_Passive (Unit_Entity)
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or else
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((Is_Remote_Types (Unit_Entity)
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or else Is_Remote_Call_Interface (Unit_Entity))
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and then Ekind (Unit_Entity) = E_Package
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and then Unit_Kind /= N_Package_Body
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and then not In_Package_Body (Unit_Entity)
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and then not In_Instance));
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end In_Preelaborated_Unit;
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------------------
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-- In_Pure_Unit --
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------------------
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function In_Pure_Unit return Boolean is
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begin
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return Is_Pure (Current_Scope);
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end In_Pure_Unit;
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------------------------
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-- In_RCI_Declaration --
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------------------------
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function In_RCI_Declaration (N : Node_Id) return Boolean is
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Unit_Entity : constant Entity_Id := Current_Scope;
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Unit_Kind : constant Node_Kind :=
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Nkind (Unit (Cunit (Current_Sem_Unit)));
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begin
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-- There are no restrictions on the private part or body
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-- of an RCI unit.
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return Is_Remote_Call_Interface (Unit_Entity)
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and then (Ekind (Unit_Entity) = E_Package
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or else Ekind (Unit_Entity) = E_Generic_Package)
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and then Unit_Kind /= N_Package_Body
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and then List_Containing (N) =
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Visible_Declarations
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(Specification (Unit_Declaration_Node (Unit_Entity)))
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and then not In_Package_Body (Unit_Entity)
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and then not In_Instance;
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end In_RCI_Declaration;
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-----------------------
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-- In_RT_Declaration --
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-----------------------
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function In_RT_Declaration return Boolean is
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Unit_Entity : constant Entity_Id := Current_Scope;
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Unit_Kind : constant Node_Kind :=
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Nkind (Unit (Cunit (Current_Sem_Unit)));
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begin
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-- There are no restrictions on the body of a Remote Types unit
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return Is_Remote_Types (Unit_Entity)
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and then (Ekind (Unit_Entity) = E_Package
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or else Ekind (Unit_Entity) = E_Generic_Package)
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and then Unit_Kind /= N_Package_Body
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and then not In_Package_Body (Unit_Entity)
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and then not In_Instance;
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end In_RT_Declaration;
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----------------------------
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-- In_Shared_Passive_Unit --
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----------------------------
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function In_Shared_Passive_Unit return Boolean is
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Unit_Entity : constant Entity_Id := Current_Scope;
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begin
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return Is_Shared_Passive (Unit_Entity);
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end In_Shared_Passive_Unit;
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---------------------------------------
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-- In_Subprogram_Task_Protected_Unit --
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---------------------------------------
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function In_Subprogram_Task_Protected_Unit return Boolean is
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E : Entity_Id;
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begin
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-- The following is to verify that a declaration is inside
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-- subprogram, generic subprogram, task unit, protected unit.
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-- Used to validate if a lib. unit is Pure. RM 10.2.1(16).
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-- Use scope chain to check successively outer scopes
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E := Current_Scope;
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loop
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if Is_Subprogram (E)
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or else
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Is_Generic_Subprogram (E)
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or else
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Is_Concurrent_Type (E)
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then
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return True;
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elsif E = Standard_Standard then
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return False;
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end if;
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E := Scope (E);
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end loop;
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end In_Subprogram_Task_Protected_Unit;
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-------------------------------
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-- Is_Non_Remote_Access_Type --
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-------------------------------
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function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean is
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U_E : constant Entity_Id := Underlying_Type (E);
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begin
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if No (U_E) then
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|
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-- This case arises for the case of a generic formal type, in which
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-- case E.2.2(8) rules will be enforced at instantiation time.
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return False;
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end if;
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return Is_Access_Type (U_E)
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and then not Is_Remote_Access_To_Class_Wide_Type (U_E)
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and then not Is_Remote_Access_To_Subprogram_Type (U_E);
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end Is_Non_Remote_Access_Type;
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|
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------------------------------------
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-- Is_Recursively_Limited_Private --
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------------------------------------
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function Is_Recursively_Limited_Private (E : Entity_Id) return Boolean is
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P : constant Node_Id := Parent (E);
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begin
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if Nkind (P) = N_Private_Type_Declaration
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and then Is_Limited_Record (E)
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then
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return True;
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elsif Nkind (P) = N_Private_Extension_Declaration then
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return Is_Recursively_Limited_Private (Etype (E));
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elsif Nkind (P) = N_Formal_Type_Declaration
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and then Ekind (E) = E_Record_Type_With_Private
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and then Is_Generic_Type (E)
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and then Is_Limited_Record (E)
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then
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return True;
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else
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return False;
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end if;
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end Is_Recursively_Limited_Private;
|
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|
|
----------------------------------
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-- Missing_Read_Write_Attribute --
|
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----------------------------------
|
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|
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function Missing_Read_Write_Attributes (E : Entity_Id) return Boolean is
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Component : Entity_Id;
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Component_Type : Entity_Id;
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U_E : constant Entity_Id := Underlying_Type (E);
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|
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function Has_Read_Write_Attributes (E : Entity_Id) return Boolean;
|
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-- Return True if entity has visible attribute definition clauses for
|
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-- Read and Write attributes.
|
|
|
|
-------------------------------
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-- Has_Read_Write_Attributes --
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-------------------------------
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function Has_Read_Write_Attributes (E : Entity_Id) return Boolean is
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begin
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return True
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and then Has_Stream_Attribute_Definition (E, TSS_Stream_Read)
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and then Has_Stream_Attribute_Definition (E, TSS_Stream_Write);
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end Has_Read_Write_Attributes;
|
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|
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-- Start of processing for Missing_Read_Write_Attributes
|
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|
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begin
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if No (U_E) then
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return False;
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elsif Has_Read_Write_Attributes (E)
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or else Has_Read_Write_Attributes (U_E)
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then
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return False;
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elsif Is_Non_Remote_Access_Type (U_E) then
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return True;
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end if;
|
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|
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if Is_Record_Type (U_E) then
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Component := First_Entity (U_E);
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while Present (Component) loop
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|
if not Is_Tag (Component) then
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Component_Type := Etype (Component);
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|
|
if Missing_Read_Write_Attributes (Component_Type) then
|
|
return True;
|
|
end if;
|
|
end if;
|
|
|
|
Next_Entity (Component);
|
|
end loop;
|
|
end if;
|
|
|
|
return False;
|
|
end Missing_Read_Write_Attributes;
|
|
|
|
-------------------------------------
|
|
-- Set_Categorization_From_Pragmas --
|
|
-------------------------------------
|
|
|
|
procedure Set_Categorization_From_Pragmas (N : Node_Id) is
|
|
P : constant Node_Id := Parent (N);
|
|
S : constant Entity_Id := Current_Scope;
|
|
|
|
procedure Set_Parents (Visibility : Boolean);
|
|
-- If this is a child instance, the parents are not immediately
|
|
-- visible during analysis. Make them momentarily visible so that
|
|
-- the argument of the pragma can be resolved properly, and reset
|
|
-- afterwards.
|
|
|
|
-----------------
|
|
-- Set_Parents --
|
|
-----------------
|
|
|
|
procedure Set_Parents (Visibility : Boolean) is
|
|
Par : Entity_Id;
|
|
begin
|
|
Par := Scope (S);
|
|
while Present (Par) and then Par /= Standard_Standard loop
|
|
Set_Is_Immediately_Visible (Par, Visibility);
|
|
Par := Scope (Par);
|
|
end loop;
|
|
end Set_Parents;
|
|
|
|
-- Start of processing for Set_Categorization_From_Pragmas
|
|
|
|
begin
|
|
-- Deal with categorization pragmas in Pragmas of Compilation_Unit.
|
|
-- The purpose is to set categorization flags before analyzing the
|
|
-- unit itself, so as to diagnose violations of categorization as
|
|
-- we process each declaration, even though the pragma appears after
|
|
-- the unit.
|
|
|
|
if Nkind (P) /= N_Compilation_Unit then
|
|
return;
|
|
end if;
|
|
|
|
declare
|
|
PN : Node_Id;
|
|
|
|
begin
|
|
if Is_Child_Unit (S)
|
|
and then Is_Generic_Instance (S)
|
|
then
|
|
Set_Parents (True);
|
|
end if;
|
|
|
|
PN := First (Pragmas_After (Aux_Decls_Node (P)));
|
|
while Present (PN) loop
|
|
|
|
-- Skip implicit types that may have been introduced by
|
|
-- previous analysis.
|
|
|
|
if Nkind (PN) = N_Pragma then
|
|
|
|
case Get_Pragma_Id (Chars (PN)) is
|
|
when Pragma_All_Calls_Remote |
|
|
Pragma_Preelaborate |
|
|
Pragma_Pure |
|
|
Pragma_Remote_Call_Interface |
|
|
Pragma_Remote_Types |
|
|
Pragma_Shared_Passive => Analyze (PN);
|
|
when others => null;
|
|
end case;
|
|
end if;
|
|
|
|
Next (PN);
|
|
end loop;
|
|
|
|
if Is_Child_Unit (S)
|
|
and then Is_Generic_Instance (S)
|
|
then
|
|
Set_Parents (False);
|
|
end if;
|
|
end;
|
|
end Set_Categorization_From_Pragmas;
|
|
|
|
-----------------------------------
|
|
-- Set_Categorization_From_Scope --
|
|
-----------------------------------
|
|
|
|
procedure Set_Categorization_From_Scope (E : Entity_Id; Scop : Entity_Id) is
|
|
Declaration : Node_Id := Empty;
|
|
Specification : Node_Id := Empty;
|
|
|
|
begin
|
|
Set_Is_Pure (E,
|
|
Is_Pure (Scop) and then Is_Library_Level_Entity (E));
|
|
|
|
if not Is_Remote_Call_Interface (E) then
|
|
if Ekind (E) in Subprogram_Kind then
|
|
Declaration := Unit_Declaration_Node (E);
|
|
|
|
if False
|
|
or else Nkind (Declaration) = N_Subprogram_Body
|
|
or else Nkind (Declaration) = N_Subprogram_Renaming_Declaration
|
|
then
|
|
Specification := Corresponding_Spec (Declaration);
|
|
end if;
|
|
end if;
|
|
|
|
-- A subprogram body or renaming-as-body is a remote call
|
|
-- interface if it serves as the completion of a subprogram
|
|
-- declaration that is a remote call interface.
|
|
|
|
if Nkind (Specification) in N_Entity then
|
|
Set_Is_Remote_Call_Interface
|
|
(E, Is_Remote_Call_Interface (Specification));
|
|
|
|
-- A subprogram declaration is a remote call interface when it is
|
|
-- declared within the visible part of, or declared by, a library
|
|
-- unit declaration that is a remote call interface.
|
|
|
|
else
|
|
Set_Is_Remote_Call_Interface
|
|
(E, Is_Remote_Call_Interface (Scop)
|
|
and then not (In_Private_Part (Scop)
|
|
or else In_Package_Body (Scop)));
|
|
end if;
|
|
end if;
|
|
|
|
Set_Is_Remote_Types (E, Is_Remote_Types (Scop));
|
|
end Set_Categorization_From_Scope;
|
|
|
|
------------------------------
|
|
-- Static_Discriminant_Expr --
|
|
------------------------------
|
|
|
|
-- We need to accomodate a Why_Not_Static call somehow here ???
|
|
|
|
function Static_Discriminant_Expr (L : List_Id) return Boolean is
|
|
Discriminant_Spec : Node_Id;
|
|
|
|
begin
|
|
Discriminant_Spec := First (L);
|
|
while Present (Discriminant_Spec) loop
|
|
if Present (Expression (Discriminant_Spec))
|
|
and then not Is_Static_Expression (Expression (Discriminant_Spec))
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
Next (Discriminant_Spec);
|
|
end loop;
|
|
|
|
return True;
|
|
end Static_Discriminant_Expr;
|
|
|
|
--------------------------------------
|
|
-- Validate_Access_Type_Declaration --
|
|
--------------------------------------
|
|
|
|
procedure Validate_Access_Type_Declaration (T : Entity_Id; N : Node_Id) is
|
|
Def : constant Node_Id := Type_Definition (N);
|
|
|
|
begin
|
|
case Nkind (Def) is
|
|
|
|
-- Access to subprogram case
|
|
|
|
when N_Access_To_Subprogram_Definition =>
|
|
|
|
-- A pure library_item must not contain the declaration of a
|
|
-- named access type, except within a subprogram, generic
|
|
-- subprogram, task unit, or protected unit (RM 10.2.1(16)).
|
|
|
|
-- This test is skipped in Ada 2005 (see AI-366)
|
|
|
|
if Ada_Version < Ada_05
|
|
and then Comes_From_Source (T)
|
|
and then In_Pure_Unit
|
|
and then not In_Subprogram_Task_Protected_Unit
|
|
then
|
|
Error_Msg_N ("named access type not allowed in pure unit", T);
|
|
end if;
|
|
|
|
-- Access to object case
|
|
|
|
when N_Access_To_Object_Definition =>
|
|
if Comes_From_Source (T)
|
|
and then In_Pure_Unit
|
|
and then not In_Subprogram_Task_Protected_Unit
|
|
then
|
|
-- We can't give the message yet, since the type is not frozen
|
|
-- and in Ada 2005 mode, access types are allowed in pure units
|
|
-- if the type has no storage pool (see AI-366). So we set a
|
|
-- flag which will be checked at freeze time.
|
|
|
|
Set_Is_Pure_Unit_Access_Type (T);
|
|
end if;
|
|
|
|
-- Check for RCI or RT unit type declaration: declaration of an
|
|
-- access-to-object type is illegal unless it is a general access
|
|
-- type that designates a class-wide limited private type.
|
|
-- Note that constraints on the primitive subprograms of the
|
|
-- designated tagged type are not enforced here but in
|
|
-- Validate_RACW_Primitives, which is done separately because the
|
|
-- designated type might not be frozen (and therefore its
|
|
-- primitive operations might not be completely known) at the
|
|
-- point of the RACW declaration.
|
|
|
|
Validate_Remote_Access_Object_Type_Declaration (T);
|
|
|
|
-- Check for shared passive unit type declaration. It should
|
|
-- not contain the declaration of access to class wide type,
|
|
-- access to task type and access to protected type with entry.
|
|
|
|
Validate_SP_Access_Object_Type_Decl (T);
|
|
|
|
when others =>
|
|
null;
|
|
end case;
|
|
|
|
-- Set categorization flag from package on entity as well, to allow
|
|
-- easy checks later on for required validations of RCI or RT units.
|
|
-- This is only done for entities that are in the original source.
|
|
|
|
if Comes_From_Source (T)
|
|
and then not (In_Package_Body (Scope (T))
|
|
or else In_Private_Part (Scope (T)))
|
|
then
|
|
Set_Is_Remote_Call_Interface
|
|
(T, Is_Remote_Call_Interface (Scope (T)));
|
|
Set_Is_Remote_Types
|
|
(T, Is_Remote_Types (Scope (T)));
|
|
end if;
|
|
end Validate_Access_Type_Declaration;
|
|
|
|
----------------------------
|
|
-- Validate_Ancestor_Part --
|
|
----------------------------
|
|
|
|
procedure Validate_Ancestor_Part (N : Node_Id) is
|
|
A : constant Node_Id := Ancestor_Part (N);
|
|
T : constant Entity_Id := Entity (A);
|
|
|
|
begin
|
|
if In_Preelaborated_Unit
|
|
and then not In_Subprogram_Or_Concurrent_Unit
|
|
and then (not Inside_A_Generic
|
|
or else Present (Enclosing_Generic_Body (N)))
|
|
then
|
|
-- We relax the restriction of 10.2.1(9) within GNAT
|
|
-- units to allow packages such as Ada.Strings.Unbounded
|
|
-- to be implemented (i.p., Null_Unbounded_String).
|
|
-- (There are ACVC tests that check that the restriction
|
|
-- is enforced, but note that AI-161, once approved,
|
|
-- will relax the restriction prohibiting default-
|
|
-- initialized objects of private and controlled
|
|
-- types.)
|
|
|
|
if Is_Private_Type (T)
|
|
and then not Is_Internal_File_Name
|
|
(Unit_File_Name (Get_Source_Unit (N)))
|
|
then
|
|
Error_Msg_N
|
|
("private ancestor type not allowed in preelaborated unit", A);
|
|
|
|
elsif Is_Record_Type (T) then
|
|
if Nkind (Parent (T)) = N_Full_Type_Declaration then
|
|
Check_Non_Static_Default_Expr
|
|
(Type_Definition (Parent (T)), A);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end Validate_Ancestor_Part;
|
|
|
|
----------------------------------------
|
|
-- Validate_Categorization_Dependency --
|
|
----------------------------------------
|
|
|
|
procedure Validate_Categorization_Dependency
|
|
(N : Node_Id;
|
|
E : Entity_Id)
|
|
is
|
|
K : constant Node_Kind := Nkind (N);
|
|
P : Node_Id := Parent (N);
|
|
U : Entity_Id := E;
|
|
Is_Subunit : constant Boolean := Nkind (P) = N_Subunit;
|
|
|
|
begin
|
|
-- Only validate library units and subunits. For subunits, checks
|
|
-- concerning withed units apply to the parent compilation unit.
|
|
|
|
if Is_Subunit then
|
|
P := Parent (P);
|
|
U := Scope (E);
|
|
|
|
while Present (U)
|
|
and then not Is_Compilation_Unit (U)
|
|
and then not Is_Child_Unit (U)
|
|
loop
|
|
U := Scope (U);
|
|
end loop;
|
|
end if;
|
|
|
|
if Nkind (P) /= N_Compilation_Unit then
|
|
return;
|
|
end if;
|
|
|
|
-- Body of RCI unit does not need validation
|
|
|
|
if Is_Remote_Call_Interface (E)
|
|
and then (Nkind (N) = N_Package_Body
|
|
or else Nkind (N) = N_Subprogram_Body)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Ada 2005 (AI-50217): Process explicit non-limited with_clauses
|
|
|
|
declare
|
|
Item : Node_Id;
|
|
Entity_Of_Withed : Entity_Id;
|
|
|
|
begin
|
|
Item := First (Context_Items (P));
|
|
while Present (Item) loop
|
|
if Nkind (Item) = N_With_Clause
|
|
and then not (Implicit_With (Item)
|
|
or else Limited_Present (Item))
|
|
then
|
|
Entity_Of_Withed := Entity (Name (Item));
|
|
Check_Categorization_Dependencies
|
|
(U, Entity_Of_Withed, Item, Is_Subunit);
|
|
end if;
|
|
|
|
Next (Item);
|
|
end loop;
|
|
end;
|
|
|
|
-- Child depends on parent; therefore parent should also be categorized
|
|
-- and satify the dependency hierarchy.
|
|
|
|
-- Check if N is a child spec
|
|
|
|
if (K in N_Generic_Declaration or else
|
|
K in N_Generic_Instantiation or else
|
|
K in N_Generic_Renaming_Declaration or else
|
|
K = N_Package_Declaration or else
|
|
K = N_Package_Renaming_Declaration or else
|
|
K = N_Subprogram_Declaration or else
|
|
K = N_Subprogram_Renaming_Declaration)
|
|
and then Present (Parent_Spec (N))
|
|
then
|
|
Check_Categorization_Dependencies (E, Scope (E), N, False);
|
|
|
|
-- Verify that public child of an RCI library unit must also be an
|
|
-- RCI library unit (RM E.2.3(15)).
|
|
|
|
if Is_Remote_Call_Interface (Scope (E))
|
|
and then not Private_Present (P)
|
|
and then not Is_Remote_Call_Interface (E)
|
|
then
|
|
Error_Msg_N ("public child of rci unit must also be rci unit", N);
|
|
end if;
|
|
end if;
|
|
end Validate_Categorization_Dependency;
|
|
|
|
--------------------------------
|
|
-- Validate_Controlled_Object --
|
|
--------------------------------
|
|
|
|
procedure Validate_Controlled_Object (E : Entity_Id) is
|
|
begin
|
|
-- Don't need this check in Ada 2005 mode, where this is all taken
|
|
-- care of by the mechanism for Preelaborable Initialization.
|
|
|
|
if Ada_Version >= Ada_05 then
|
|
return;
|
|
end if;
|
|
|
|
-- For now, never apply this check for internal GNAT units, since we
|
|
-- have a number of cases in the library where we are stuck with objects
|
|
-- of this type, and the RM requires Preelaborate.
|
|
|
|
-- For similar reasons, we only do this check for source entities, since
|
|
-- we generate entities of this type in some situations.
|
|
|
|
-- Note that the 10.2.1(9) restrictions are not relevant to us anyway.
|
|
-- We have to enforce them for RM compatibility, but we have no trouble
|
|
-- accepting these objects and doing the right thing. Note that there is
|
|
-- no requirement that Preelaborate not actually generate any code!
|
|
|
|
if In_Preelaborated_Unit
|
|
and then not Debug_Flag_PP
|
|
and then Comes_From_Source (E)
|
|
and then not
|
|
Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (E)))
|
|
and then (not Inside_A_Generic
|
|
or else Present (Enclosing_Generic_Body (E)))
|
|
and then not Is_Protected_Type (Etype (E))
|
|
then
|
|
Error_Msg_N
|
|
("library level controlled object not allowed in " &
|
|
"preelaborated unit", E);
|
|
end if;
|
|
end Validate_Controlled_Object;
|
|
|
|
--------------------------------------
|
|
-- Validate_Null_Statement_Sequence --
|
|
--------------------------------------
|
|
|
|
procedure Validate_Null_Statement_Sequence (N : Node_Id) is
|
|
Item : Node_Id;
|
|
|
|
begin
|
|
if In_Preelaborated_Unit then
|
|
Item := First (Statements (Handled_Statement_Sequence (N)));
|
|
while Present (Item) loop
|
|
if Nkind (Item) /= N_Label
|
|
and then Nkind (Item) /= N_Null_Statement
|
|
then
|
|
-- In GNAT mode, this is a warning, allowing the run-time
|
|
-- to judiciously bypass this error condition.
|
|
|
|
Error_Msg_Warn := GNAT_Mode;
|
|
Error_Msg_N
|
|
("<statements not allowed in preelaborated unit", Item);
|
|
|
|
exit;
|
|
end if;
|
|
|
|
Next (Item);
|
|
end loop;
|
|
end if;
|
|
end Validate_Null_Statement_Sequence;
|
|
|
|
---------------------------------
|
|
-- Validate_Object_Declaration --
|
|
---------------------------------
|
|
|
|
procedure Validate_Object_Declaration (N : Node_Id) is
|
|
Id : constant Entity_Id := Defining_Identifier (N);
|
|
E : constant Node_Id := Expression (N);
|
|
Odf : constant Node_Id := Object_Definition (N);
|
|
T : constant Entity_Id := Etype (Id);
|
|
|
|
begin
|
|
-- Verify that any access to subprogram object does not have in its
|
|
-- subprogram profile access type parameters or limited parameters
|
|
-- without Read and Write attributes (E.2.3(13)).
|
|
|
|
Validate_RCI_Subprogram_Declaration (N);
|
|
|
|
-- Check that if we are in preelaborated elaboration code, then we
|
|
-- do not have an instance of a default initialized private, task or
|
|
-- protected object declaration which would violate (RM 10.2.1(9)).
|
|
-- Note that constants are never default initialized (and the test
|
|
-- below also filters out deferred constants). A variable is default
|
|
-- initialized if it does *not* have an initialization expression.
|
|
|
|
-- Filter out cases that are not declaration of a variable from source
|
|
|
|
if Nkind (N) /= N_Object_Declaration
|
|
or else Constant_Present (N)
|
|
or else not Comes_From_Source (Id)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Exclude generic specs from the checks (this will get rechecked
|
|
-- on instantiations).
|
|
|
|
if Inside_A_Generic
|
|
and then No (Enclosing_Generic_Body (Id))
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Required checks for declaration that is in a preelaborated
|
|
-- package and is not within some subprogram.
|
|
|
|
if In_Preelaborated_Unit
|
|
and then not In_Subprogram_Or_Concurrent_Unit
|
|
then
|
|
-- Check for default initialized variable case. Note that in
|
|
-- accordance with (RM B.1(24)) imported objects are not
|
|
-- subject to default initialization.
|
|
|
|
if No (E) and then not Is_Imported (Id) then
|
|
declare
|
|
Ent : Entity_Id := T;
|
|
|
|
begin
|
|
-- An array whose component type is a record with nonstatic
|
|
-- default expressions is a violation, so we get the array's
|
|
-- component type.
|
|
|
|
if Is_Array_Type (Ent) then
|
|
declare
|
|
Comp_Type : Entity_Id;
|
|
|
|
begin
|
|
Comp_Type := Component_Type (Ent);
|
|
while Is_Array_Type (Comp_Type) loop
|
|
Comp_Type := Component_Type (Comp_Type);
|
|
end loop;
|
|
|
|
Ent := Comp_Type;
|
|
end;
|
|
end if;
|
|
|
|
-- Object decl. that is of record type and has no default expr.
|
|
-- should check if there is any non-static default expression
|
|
-- in component decl. of the record type decl.
|
|
|
|
if Is_Record_Type (Ent) then
|
|
if Nkind (Parent (Ent)) = N_Full_Type_Declaration then
|
|
Check_Non_Static_Default_Expr
|
|
(Type_Definition (Parent (Ent)), N);
|
|
|
|
elsif Nkind (Odf) = N_Subtype_Indication
|
|
and then not Is_Array_Type (T)
|
|
and then not Is_Private_Type (T)
|
|
then
|
|
Check_Non_Static_Default_Expr (Type_Definition
|
|
(Parent (Entity (Subtype_Mark (Odf)))), N);
|
|
end if;
|
|
end if;
|
|
|
|
-- Check for invalid use of private object. Note that Ada 2005
|
|
-- AI-161 modifies the rules for Ada 2005, including the use of
|
|
-- the new pragma Preelaborable_Initialization.
|
|
|
|
if Is_Private_Type (Ent)
|
|
or else Depends_On_Private (Ent)
|
|
then
|
|
-- Case where type has preelaborable initialization which
|
|
-- means that a pragma Preelaborable_Initialization was
|
|
-- given for the private type.
|
|
|
|
if Has_Preelaborable_Initialization (Ent) then
|
|
|
|
-- But for the predefined units, we will ignore this
|
|
-- status unless we are in Ada 2005 mode since we want
|
|
-- Ada 95 compatible behavior, in which the entities
|
|
-- marked with this pragma in the predefined library are
|
|
-- not treated specially.
|
|
|
|
if Ada_Version < Ada_05 then
|
|
Error_Msg_N
|
|
("private object not allowed in preelaborated unit",
|
|
N);
|
|
Error_Msg_N ("\(would be legal in Ada 2005 mode)", N);
|
|
end if;
|
|
|
|
-- Type does not have preelaborable initialization
|
|
|
|
else
|
|
-- We allow this when compiling in GNAT mode to make life
|
|
-- easier for some cases where it would otherwise be hard
|
|
-- to be exactly valid Ada.
|
|
|
|
if not GNAT_Mode then
|
|
Error_Msg_N
|
|
("private object not allowed in preelaborated unit",
|
|
N);
|
|
|
|
-- If we are in Ada 2005 mode, add a message if pragma
|
|
-- Preelaborable_Initialization on the type of the
|
|
-- object would help.
|
|
|
|
-- If the type has no full view (generic type, or
|
|
-- previous error), the warning does not apply.
|
|
|
|
if Ada_Version >= Ada_05
|
|
and then Is_Private_Type (Ent)
|
|
and then Present (Full_View (Ent))
|
|
and then
|
|
Has_Preelaborable_Initialization (Full_View (Ent))
|
|
then
|
|
Error_Msg_Sloc := Sloc (Ent);
|
|
Error_Msg_NE
|
|
("\would be legal if pragma Preelaborable_" &
|
|
"Initialization given for & #", N, Ent);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
-- Access to Task or Protected type
|
|
|
|
elsif Is_Entity_Name (Odf)
|
|
and then Present (Etype (Odf))
|
|
and then Is_Access_Type (Etype (Odf))
|
|
then
|
|
Ent := Designated_Type (Etype (Odf));
|
|
|
|
elsif Is_Entity_Name (Odf) then
|
|
Ent := Entity (Odf);
|
|
|
|
elsif Nkind (Odf) = N_Subtype_Indication then
|
|
Ent := Etype (Subtype_Mark (Odf));
|
|
|
|
elsif
|
|
Nkind (Odf) = N_Constrained_Array_Definition
|
|
then
|
|
Ent := Component_Type (T);
|
|
|
|
-- else
|
|
-- return;
|
|
end if;
|
|
|
|
if Is_Task_Type (Ent)
|
|
or else (Is_Protected_Type (Ent) and then Has_Entries (Ent))
|
|
then
|
|
Error_Msg_N
|
|
("concurrent object not allowed in preelaborated unit",
|
|
N);
|
|
return;
|
|
end if;
|
|
end;
|
|
end if;
|
|
|
|
-- Non-static discriminant not allowed in preelaborayted unit
|
|
|
|
if Is_Record_Type (Etype (Id)) then
|
|
declare
|
|
ET : constant Entity_Id := Etype (Id);
|
|
EE : constant Entity_Id := Etype (Etype (Id));
|
|
PEE : Node_Id;
|
|
|
|
begin
|
|
if Has_Discriminants (ET)
|
|
and then Present (EE)
|
|
then
|
|
PEE := Parent (EE);
|
|
|
|
if Nkind (PEE) = N_Full_Type_Declaration
|
|
and then not Static_Discriminant_Expr
|
|
(Discriminant_Specifications (PEE))
|
|
then
|
|
Error_Msg_N
|
|
("non-static discriminant in preelaborated unit",
|
|
PEE);
|
|
end if;
|
|
end if;
|
|
end;
|
|
end if;
|
|
end if;
|
|
|
|
-- A pure library_item must not contain the declaration of any variable
|
|
-- except within a subprogram, generic subprogram, task unit, or
|
|
-- protected unit (RM 10.2.1(16)).
|
|
|
|
if In_Pure_Unit
|
|
and then not In_Subprogram_Task_Protected_Unit
|
|
then
|
|
Error_Msg_N ("declaration of variable not allowed in pure unit", N);
|
|
|
|
-- The visible part of an RCI library unit must not contain the
|
|
-- declaration of a variable (RM E.1.3(9))
|
|
|
|
elsif In_RCI_Declaration (N) then
|
|
Error_Msg_N ("declaration of variable not allowed in rci unit", N);
|
|
|
|
-- The visible part of a Shared Passive library unit must not contain
|
|
-- the declaration of a variable (RM E.2.2(7))
|
|
|
|
elsif In_RT_Declaration then
|
|
Error_Msg_N
|
|
("variable declaration not allowed in remote types unit", N);
|
|
end if;
|
|
|
|
end Validate_Object_Declaration;
|
|
|
|
------------------------------
|
|
-- Validate_RACW_Primitives --
|
|
------------------------------
|
|
|
|
procedure Validate_RACW_Primitives (T : Entity_Id) is
|
|
Desig_Type : Entity_Id;
|
|
Primitive_Subprograms : Elist_Id;
|
|
Subprogram_Elmt : Elmt_Id;
|
|
Subprogram : Entity_Id;
|
|
Profile : List_Id;
|
|
Param_Spec : Node_Id;
|
|
Param : Entity_Id;
|
|
Param_Type : Entity_Id;
|
|
Rtyp : Node_Id;
|
|
|
|
begin
|
|
Desig_Type := Etype (Designated_Type (T));
|
|
|
|
Primitive_Subprograms := Primitive_Operations (Desig_Type);
|
|
|
|
Subprogram_Elmt := First_Elmt (Primitive_Subprograms);
|
|
while Subprogram_Elmt /= No_Elmt loop
|
|
Subprogram := Node (Subprogram_Elmt);
|
|
|
|
if not Comes_From_Source (Subprogram) then
|
|
goto Next_Subprogram;
|
|
end if;
|
|
|
|
-- Check return type
|
|
|
|
if Ekind (Subprogram) = E_Function then
|
|
Rtyp := Etype (Subprogram);
|
|
|
|
if Has_Controlling_Result (Subprogram) then
|
|
null;
|
|
|
|
elsif Ekind (Rtyp) = E_Anonymous_Access_Type then
|
|
Error_Msg_N
|
|
("anonymous access result in remote object primitive", Rtyp);
|
|
|
|
elsif Is_Limited_Type (Rtyp) then
|
|
if No (TSS (Rtyp, TSS_Stream_Read))
|
|
or else
|
|
No (TSS (Rtyp, TSS_Stream_Write))
|
|
then
|
|
Error_Msg_N
|
|
("limited return type must have Read and Write attributes",
|
|
Parent (Subprogram));
|
|
Explain_Limited_Type (Rtyp, Parent (Subprogram));
|
|
end if;
|
|
|
|
end if;
|
|
end if;
|
|
|
|
Profile := Parameter_Specifications (Parent (Subprogram));
|
|
|
|
-- Profile must exist, otherwise not primitive operation
|
|
|
|
Param_Spec := First (Profile);
|
|
while Present (Param_Spec) loop
|
|
|
|
-- Now find out if this parameter is a controlling parameter
|
|
|
|
Param := Defining_Identifier (Param_Spec);
|
|
Param_Type := Etype (Param);
|
|
|
|
if Is_Controlling_Formal (Param) then
|
|
|
|
-- It is a controlling parameter, so specific checks below
|
|
-- do not apply.
|
|
|
|
null;
|
|
|
|
elsif Ekind (Param_Type) = E_Anonymous_Access_Type then
|
|
|
|
-- From RM E.2.2(14), no access parameter other than
|
|
-- controlling ones may be used.
|
|
|
|
Error_Msg_N
|
|
("non-controlling access parameter", Param_Spec);
|
|
|
|
elsif Is_Limited_Type (Param_Type) then
|
|
|
|
-- Not a controlling parameter, so type must have Read and
|
|
-- Write attributes.
|
|
|
|
if No (TSS (Param_Type, TSS_Stream_Read))
|
|
or else
|
|
No (TSS (Param_Type, TSS_Stream_Write))
|
|
then
|
|
Error_Msg_N
|
|
("limited formal must have Read and Write attributes",
|
|
Param_Spec);
|
|
Explain_Limited_Type (Param_Type, Param_Spec);
|
|
end if;
|
|
end if;
|
|
|
|
-- Check next parameter in this subprogram
|
|
|
|
Next (Param_Spec);
|
|
end loop;
|
|
|
|
<<Next_Subprogram>>
|
|
Next_Elmt (Subprogram_Elmt);
|
|
end loop;
|
|
end Validate_RACW_Primitives;
|
|
|
|
-------------------------------
|
|
-- Validate_RCI_Declarations --
|
|
-------------------------------
|
|
|
|
procedure Validate_RCI_Declarations (P : Entity_Id) is
|
|
E : Entity_Id;
|
|
|
|
begin
|
|
E := First_Entity (P);
|
|
while Present (E) loop
|
|
if Comes_From_Source (E) then
|
|
if Is_Limited_Type (E) then
|
|
Error_Msg_N
|
|
("limited type not allowed in rci unit", Parent (E));
|
|
Explain_Limited_Type (E, Parent (E));
|
|
|
|
elsif Ekind (E) = E_Generic_Function
|
|
or else Ekind (E) = E_Generic_Package
|
|
or else Ekind (E) = E_Generic_Procedure
|
|
then
|
|
Error_Msg_N ("generic declaration not allowed in rci unit",
|
|
Parent (E));
|
|
|
|
elsif (Ekind (E) = E_Function
|
|
or else Ekind (E) = E_Procedure)
|
|
and then Has_Pragma_Inline (E)
|
|
then
|
|
Error_Msg_N
|
|
("inlined subprogram not allowed in rci unit", Parent (E));
|
|
|
|
-- Inner packages that are renamings need not be checked. Generic
|
|
-- RCI packages are subject to the checks, but entities that come
|
|
-- from formal packages are not part of the visible declarations
|
|
-- of the package and are not checked.
|
|
|
|
elsif Ekind (E) = E_Package then
|
|
if Present (Renamed_Entity (E)) then
|
|
null;
|
|
|
|
elsif Ekind (P) /= E_Generic_Package
|
|
or else List_Containing (Unit_Declaration_Node (E)) /=
|
|
Generic_Formal_Declarations
|
|
(Unit_Declaration_Node (P))
|
|
then
|
|
Validate_RCI_Declarations (E);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
Next_Entity (E);
|
|
end loop;
|
|
end Validate_RCI_Declarations;
|
|
|
|
-----------------------------------------
|
|
-- Validate_RCI_Subprogram_Declaration --
|
|
-----------------------------------------
|
|
|
|
procedure Validate_RCI_Subprogram_Declaration (N : Node_Id) is
|
|
K : constant Node_Kind := Nkind (N);
|
|
Profile : List_Id;
|
|
Id : Node_Id;
|
|
Param_Spec : Node_Id;
|
|
Param_Type : Entity_Id;
|
|
Base_Param_Type : Entity_Id;
|
|
Base_Under_Type : Entity_Id;
|
|
Type_Decl : Node_Id;
|
|
Error_Node : Node_Id := N;
|
|
|
|
begin
|
|
-- There are two possible cases in which this procedure is called:
|
|
|
|
-- 1. called from Analyze_Subprogram_Declaration.
|
|
-- 2. called from Validate_Object_Declaration (access to subprogram).
|
|
|
|
if not In_RCI_Declaration (N) then
|
|
return;
|
|
end if;
|
|
|
|
if K = N_Subprogram_Declaration then
|
|
Profile := Parameter_Specifications (Specification (N));
|
|
|
|
else pragma Assert (K = N_Object_Declaration);
|
|
Id := Defining_Identifier (N);
|
|
|
|
if Nkind (Id) = N_Defining_Identifier
|
|
and then Nkind (Parent (Etype (Id))) = N_Full_Type_Declaration
|
|
and then Ekind (Etype (Id)) = E_Access_Subprogram_Type
|
|
then
|
|
Profile :=
|
|
Parameter_Specifications (Type_Definition (Parent (Etype (Id))));
|
|
else
|
|
return;
|
|
end if;
|
|
end if;
|
|
|
|
-- Iterate through the parameter specification list, checking that
|
|
-- no access parameter and no limited type parameter in the list.
|
|
-- RM E.2.3 (14)
|
|
|
|
if Present (Profile) then
|
|
Param_Spec := First (Profile);
|
|
while Present (Param_Spec) loop
|
|
Param_Type := Etype (Defining_Identifier (Param_Spec));
|
|
Type_Decl := Parent (Param_Type);
|
|
|
|
if Ekind (Param_Type) = E_Anonymous_Access_Type then
|
|
|
|
if K = N_Subprogram_Declaration then
|
|
Error_Node := Param_Spec;
|
|
end if;
|
|
|
|
-- Report error only if declaration is in source program
|
|
|
|
if Comes_From_Source
|
|
(Defining_Entity (Specification (N)))
|
|
then
|
|
Error_Msg_N
|
|
("subprogram in rci unit cannot have access parameter",
|
|
Error_Node);
|
|
end if;
|
|
|
|
-- For limited private type parameter, we check only the private
|
|
-- declaration and ignore full type declaration, unless this is
|
|
-- the only declaration for the type, eg. as a limited record.
|
|
|
|
elsif Is_Limited_Type (Param_Type)
|
|
and then (Nkind (Type_Decl) = N_Private_Type_Declaration
|
|
or else
|
|
(Nkind (Type_Decl) = N_Full_Type_Declaration
|
|
and then not (Has_Private_Declaration (Param_Type))
|
|
and then Comes_From_Source (N)))
|
|
then
|
|
-- A limited parameter is legal only if user-specified Read and
|
|
-- Write attributes exist for it. Second part of RM E.2.3 (14).
|
|
|
|
if No (Full_View (Param_Type))
|
|
and then Ekind (Param_Type) /= E_Record_Type
|
|
then
|
|
-- Type does not have completion yet, so if declared in in
|
|
-- the current RCI scope it is illegal, and will be flagged
|
|
-- subsequently.
|
|
|
|
return;
|
|
end if;
|
|
|
|
-- In Ada 95 the rules permit using a limited type that has
|
|
-- user-specified Read and Write attributes that are specified
|
|
-- in the private part of the package, whereas Ada 2005
|
|
-- (AI-240) revises this to require the attributes to be
|
|
-- "available" (implying that the attribute clauses must be
|
|
-- visible to the RCI client). The Ada 95 rules violate the
|
|
-- contract model for privacy, but we support both semantics
|
|
-- for now for compatibility (note that ACATS test BXE2009
|
|
-- checks a case that conforms to the Ada 95 rules but is
|
|
-- illegal in Ada 2005).
|
|
|
|
Base_Param_Type := Base_Type (Param_Type);
|
|
Base_Under_Type := Base_Type (Underlying_Type
|
|
(Base_Param_Type));
|
|
|
|
if (Ada_Version < Ada_05
|
|
and then
|
|
(No (TSS (Base_Param_Type, TSS_Stream_Read))
|
|
or else
|
|
No (TSS (Base_Param_Type, TSS_Stream_Write)))
|
|
and then
|
|
(No (TSS (Base_Under_Type, TSS_Stream_Read))
|
|
or else
|
|
No (TSS (Base_Under_Type, TSS_Stream_Write))))
|
|
or else
|
|
(Ada_Version >= Ada_05
|
|
and then
|
|
(No (TSS (Base_Param_Type, TSS_Stream_Read))
|
|
or else
|
|
No (TSS (Base_Param_Type, TSS_Stream_Write))
|
|
or else
|
|
Is_Hidden (TSS (Base_Param_Type, TSS_Stream_Read))
|
|
or else
|
|
Is_Hidden (TSS (Base_Param_Type, TSS_Stream_Write))))
|
|
then
|
|
if K = N_Subprogram_Declaration then
|
|
Error_Node := Param_Spec;
|
|
end if;
|
|
|
|
if Ada_Version >= Ada_05 then
|
|
Error_Msg_N
|
|
("limited parameter in rci unit "
|
|
& "must have visible read/write attributes ",
|
|
Error_Node);
|
|
else
|
|
Error_Msg_N
|
|
("limited parameter in rci unit "
|
|
& "must have read/write attributes ",
|
|
Error_Node);
|
|
end if;
|
|
Explain_Limited_Type (Param_Type, Error_Node);
|
|
end if;
|
|
end if;
|
|
|
|
Next (Param_Spec);
|
|
end loop;
|
|
end if;
|
|
end Validate_RCI_Subprogram_Declaration;
|
|
|
|
----------------------------------------------------
|
|
-- Validate_Remote_Access_Object_Type_Declaration --
|
|
----------------------------------------------------
|
|
|
|
procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id) is
|
|
Direct_Designated_Type : Entity_Id;
|
|
Desig_Type : Entity_Id;
|
|
|
|
begin
|
|
-- We are called from Analyze_Type_Declaration, and the Nkind of the
|
|
-- given node is N_Access_To_Object_Definition.
|
|
|
|
if not Comes_From_Source (T)
|
|
or else (not In_RCI_Declaration (Parent (T))
|
|
and then not In_RT_Declaration)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- An access definition in the private part of a Remote Types package
|
|
-- may be legal if it has user-defined Read and Write attributes. This
|
|
-- will be checked at the end of the package spec processing.
|
|
|
|
if In_RT_Declaration and then In_Private_Part (Scope (T)) then
|
|
return;
|
|
end if;
|
|
|
|
-- Check RCI or RT unit type declaration. It may not contain the
|
|
-- declaration of an access-to-object type unless it is a general access
|
|
-- type that designates a class-wide limited private type. There are
|
|
-- also constraints on the primitive subprograms of the class-wide type
|
|
-- (RM E.2.2(14), see Validate_RACW_Primitives).
|
|
|
|
if Ekind (T) /= E_General_Access_Type
|
|
or else Ekind (Designated_Type (T)) /= E_Class_Wide_Type
|
|
then
|
|
if In_RCI_Declaration (Parent (T)) then
|
|
Error_Msg_N
|
|
("error in access type in Remote_Call_Interface unit", T);
|
|
else
|
|
Error_Msg_N
|
|
("error in access type in Remote_Types unit", T);
|
|
end if;
|
|
|
|
Error_Msg_N ("\must be general access to class-wide type", T);
|
|
return;
|
|
end if;
|
|
|
|
Direct_Designated_Type := Designated_Type (T);
|
|
Desig_Type := Etype (Direct_Designated_Type);
|
|
|
|
if not Is_Recursively_Limited_Private (Desig_Type) then
|
|
Error_Msg_N
|
|
("error in designated type of remote access to class-wide type", T);
|
|
Error_Msg_N
|
|
("\must be tagged limited private or private extension of type", T);
|
|
return;
|
|
end if;
|
|
|
|
-- Now this is an RCI unit access-to-class-wide-limited-private type
|
|
-- declaration. Set the type entity to be Is_Remote_Call_Interface to
|
|
-- optimize later checks by avoiding tree traversal to find out if this
|
|
-- entity is inside an RCI unit.
|
|
|
|
Set_Is_Remote_Call_Interface (T);
|
|
end Validate_Remote_Access_Object_Type_Declaration;
|
|
|
|
-----------------------------------------------
|
|
-- Validate_Remote_Access_To_Class_Wide_Type --
|
|
-----------------------------------------------
|
|
|
|
procedure Validate_Remote_Access_To_Class_Wide_Type (N : Node_Id) is
|
|
K : constant Node_Kind := Nkind (N);
|
|
PK : constant Node_Kind := Nkind (Parent (N));
|
|
E : Entity_Id;
|
|
|
|
begin
|
|
-- This subprogram enforces the checks in (RM E.2.2(8)) for certain uses
|
|
-- of class-wide limited private types.
|
|
|
|
-- Storage_Pool and Storage_Size are not defined for such types
|
|
--
|
|
-- The expected type of allocator must not not be such a type.
|
|
|
|
-- The actual parameter of generic instantiation must not be such a
|
|
-- type if the formal parameter is of an access type.
|
|
|
|
-- On entry, there are five cases
|
|
|
|
-- 1. called from sem_attr Analyze_Attribute where attribute name is
|
|
-- either Storage_Pool or Storage_Size.
|
|
|
|
-- 2. called from exp_ch4 Expand_N_Allocator
|
|
|
|
-- 3. called from sem_ch12 Analyze_Associations
|
|
|
|
-- 4. called from sem_ch4 Analyze_Explicit_Dereference
|
|
|
|
-- 5. called from sem_res Resolve_Actuals
|
|
|
|
if K = N_Attribute_Reference then
|
|
E := Etype (Prefix (N));
|
|
|
|
if Is_Remote_Access_To_Class_Wide_Type (E) then
|
|
Error_Msg_N ("incorrect attribute of remote operand", N);
|
|
return;
|
|
end if;
|
|
|
|
elsif K = N_Allocator then
|
|
E := Etype (N);
|
|
|
|
if Is_Remote_Access_To_Class_Wide_Type (E) then
|
|
Error_Msg_N ("incorrect expected remote type of allocator", N);
|
|
return;
|
|
end if;
|
|
|
|
elsif K in N_Has_Entity then
|
|
E := Entity (N);
|
|
|
|
if Is_Remote_Access_To_Class_Wide_Type (E) then
|
|
Error_Msg_N ("incorrect remote type generic actual", N);
|
|
return;
|
|
end if;
|
|
|
|
-- This subprogram also enforces the checks in E.2.2(13). A value of
|
|
-- such type must not be dereferenced unless as controlling operand of
|
|
-- a dispatching call.
|
|
|
|
elsif K = N_Explicit_Dereference
|
|
and then (Comes_From_Source (N)
|
|
or else (Nkind (Original_Node (N)) = N_Selected_Component
|
|
and then Comes_From_Source (Original_Node (N))))
|
|
then
|
|
E := Etype (Prefix (N));
|
|
|
|
-- If the class-wide type is not a remote one, the restrictions
|
|
-- do not apply.
|
|
|
|
if not Is_Remote_Access_To_Class_Wide_Type (E) then
|
|
return;
|
|
end if;
|
|
|
|
-- If we have a true dereference that comes from source and that
|
|
-- is a controlling argument for a dispatching call, accept it.
|
|
|
|
if Is_Actual_Parameter (N)
|
|
and then Is_Controlling_Actual (N)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- If we are just within a procedure or function call and the
|
|
-- dereference has not been analyzed, return because this procedure
|
|
-- will be called again from sem_res Resolve_Actuals.
|
|
|
|
if Is_Actual_Parameter (N)
|
|
and then not Analyzed (N)
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- We must allow expanded code to generate a reference to the tag of
|
|
-- the designated object (may be either the actual tag, or the stub
|
|
-- tag in the case of a remote object).
|
|
|
|
if PK = N_Selected_Component
|
|
and then Is_Tag (Entity (Selector_Name (Parent (N))))
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- The following code is needed for expansion of RACW Write
|
|
-- attribute, since such expressions can appear in the expanded
|
|
-- code.
|
|
|
|
if not Comes_From_Source (N)
|
|
and then
|
|
(PK = N_In
|
|
or else PK = N_Attribute_Reference
|
|
or else
|
|
(PK = N_Type_Conversion
|
|
and then Present (Parent (N))
|
|
and then Present (Parent (Parent (N)))
|
|
and then
|
|
Nkind (Parent (Parent (N))) = N_Selected_Component))
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
Error_Msg_N ("incorrect remote type dereference", N);
|
|
end if;
|
|
end Validate_Remote_Access_To_Class_Wide_Type;
|
|
|
|
------------------------------------------
|
|
-- Validate_Remote_Type_Type_Conversion --
|
|
------------------------------------------
|
|
|
|
procedure Validate_Remote_Type_Type_Conversion (N : Node_Id) is
|
|
S : constant Entity_Id := Etype (N);
|
|
E : constant Entity_Id := Etype (Expression (N));
|
|
|
|
begin
|
|
-- This test is required in the case where a conversion appears inside a
|
|
-- normal package, it does not necessarily have to be inside an RCI,
|
|
-- Remote_Types unit (RM E.2.2(9,12)).
|
|
|
|
if Is_Remote_Access_To_Subprogram_Type (E)
|
|
and then not Is_Remote_Access_To_Subprogram_Type (S)
|
|
then
|
|
Error_Msg_N
|
|
("incorrect conversion of remote operand to local type", N);
|
|
return;
|
|
|
|
elsif not Is_Remote_Access_To_Subprogram_Type (E)
|
|
and then Is_Remote_Access_To_Subprogram_Type (S)
|
|
then
|
|
Error_Msg_N
|
|
("incorrect conversion of local operand to remote type", N);
|
|
return;
|
|
|
|
elsif Is_Remote_Access_To_Class_Wide_Type (E)
|
|
and then not Is_Remote_Access_To_Class_Wide_Type (S)
|
|
then
|
|
Error_Msg_N
|
|
("incorrect conversion of remote operand to local type", N);
|
|
return;
|
|
end if;
|
|
|
|
-- If a local access type is converted into a RACW type, then the
|
|
-- current unit has a pointer that may now be exported to another
|
|
-- partition.
|
|
|
|
if Is_Remote_Access_To_Class_Wide_Type (S)
|
|
and then not Is_Remote_Access_To_Class_Wide_Type (E)
|
|
then
|
|
Set_Has_RACW (Current_Sem_Unit);
|
|
end if;
|
|
end Validate_Remote_Type_Type_Conversion;
|
|
|
|
-------------------------------
|
|
-- Validate_RT_RAT_Component --
|
|
-------------------------------
|
|
|
|
procedure Validate_RT_RAT_Component (N : Node_Id) is
|
|
Spec : constant Node_Id := Specification (N);
|
|
Name_U : constant Entity_Id := Defining_Entity (Spec);
|
|
Typ : Entity_Id;
|
|
U_Typ : Entity_Id;
|
|
First_Priv_Ent : constant Entity_Id := First_Private_Entity (Name_U);
|
|
|
|
begin
|
|
if not Is_Remote_Types (Name_U) then
|
|
return;
|
|
end if;
|
|
|
|
Typ := First_Entity (Name_U);
|
|
while Present (Typ) and then Typ /= First_Priv_Ent loop
|
|
U_Typ := Underlying_Type (Typ);
|
|
|
|
if No (U_Typ) then
|
|
U_Typ := Typ;
|
|
end if;
|
|
|
|
if Comes_From_Source (Typ) and then Is_Type (Typ) then
|
|
if Missing_Read_Write_Attributes (Typ) then
|
|
if Is_Non_Remote_Access_Type (Typ) then
|
|
Error_Msg_N ("error in non-remote access type", U_Typ);
|
|
else
|
|
Error_Msg_N
|
|
("error in record type containing a component of a " &
|
|
"non-remote access type", U_Typ);
|
|
end if;
|
|
|
|
if Ada_Version >= Ada_05 then
|
|
Error_Msg_N
|
|
("\must have visible Read and Write attribute " &
|
|
"definition clauses ('R'M E.2.2(8))", U_Typ);
|
|
else
|
|
Error_Msg_N
|
|
("\must have Read and Write attribute " &
|
|
"definition clauses ('R'M E.2.2(8))", U_Typ);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
|
|
Next_Entity (Typ);
|
|
end loop;
|
|
end Validate_RT_RAT_Component;
|
|
|
|
-----------------------------------------
|
|
-- Validate_SP_Access_Object_Type_Decl --
|
|
-----------------------------------------
|
|
|
|
procedure Validate_SP_Access_Object_Type_Decl (T : Entity_Id) is
|
|
Direct_Designated_Type : Entity_Id;
|
|
|
|
function Has_Entry_Declarations (E : Entity_Id) return Boolean;
|
|
-- Return true if the protected type designated by T has
|
|
-- entry declarations.
|
|
|
|
----------------------------
|
|
-- Has_Entry_Declarations --
|
|
----------------------------
|
|
|
|
function Has_Entry_Declarations (E : Entity_Id) return Boolean is
|
|
Ety : Entity_Id;
|
|
|
|
begin
|
|
if Nkind (Parent (E)) = N_Protected_Type_Declaration then
|
|
Ety := First_Entity (E);
|
|
while Present (Ety) loop
|
|
if Ekind (Ety) = E_Entry then
|
|
return True;
|
|
end if;
|
|
|
|
Next_Entity (Ety);
|
|
end loop;
|
|
end if;
|
|
|
|
return False;
|
|
end Has_Entry_Declarations;
|
|
|
|
-- Start of processing for Validate_SP_Access_Object_Type_Decl
|
|
|
|
begin
|
|
-- We are called from Sem_Ch3.Analyze_Type_Declaration, and the
|
|
-- Nkind of the given entity is N_Access_To_Object_Definition.
|
|
|
|
if not Comes_From_Source (T)
|
|
or else not In_Shared_Passive_Unit
|
|
or else In_Subprogram_Task_Protected_Unit
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
-- Check Shared Passive unit. It should not contain the declaration
|
|
-- of an access-to-object type whose designated type is a class-wide
|
|
-- type, task type or protected type with entry (RM E.2.1(7)).
|
|
|
|
Direct_Designated_Type := Designated_Type (T);
|
|
|
|
if Ekind (Direct_Designated_Type) = E_Class_Wide_Type then
|
|
Error_Msg_N
|
|
("invalid access-to-class-wide type in shared passive unit", T);
|
|
return;
|
|
|
|
elsif Ekind (Direct_Designated_Type) in Task_Kind then
|
|
Error_Msg_N
|
|
("invalid access-to-task type in shared passive unit", T);
|
|
return;
|
|
|
|
elsif Ekind (Direct_Designated_Type) in Protected_Kind
|
|
and then Has_Entry_Declarations (Direct_Designated_Type)
|
|
then
|
|
Error_Msg_N
|
|
("invalid access-to-protected type in shared passive unit", T);
|
|
return;
|
|
end if;
|
|
end Validate_SP_Access_Object_Type_Decl;
|
|
|
|
---------------------------------
|
|
-- Validate_Static_Object_Name --
|
|
---------------------------------
|
|
|
|
procedure Validate_Static_Object_Name (N : Node_Id) is
|
|
E : Entity_Id;
|
|
|
|
function Is_Primary (N : Node_Id) return Boolean;
|
|
-- Determine whether node is syntactically a primary in an expression
|
|
-- This function should probably be somewhere else ???
|
|
-- Also it does not do what it says, e.g if N is a binary operator
|
|
-- whose parent is a binary operator, Is_Primary returns True ???
|
|
|
|
----------------
|
|
-- Is_Primary --
|
|
----------------
|
|
|
|
function Is_Primary (N : Node_Id) return Boolean is
|
|
K : constant Node_Kind := Nkind (Parent (N));
|
|
|
|
begin
|
|
case K is
|
|
when N_Op | N_Membership_Test =>
|
|
return True;
|
|
|
|
when N_Aggregate
|
|
| N_Component_Association
|
|
| N_Index_Or_Discriminant_Constraint =>
|
|
return True;
|
|
|
|
when N_Attribute_Reference =>
|
|
return Attribute_Name (Parent (N)) /= Name_Address
|
|
and then Attribute_Name (Parent (N)) /= Name_Access
|
|
and then Attribute_Name (Parent (N)) /= Name_Unchecked_Access
|
|
and then
|
|
Attribute_Name (Parent (N)) /= Name_Unrestricted_Access;
|
|
|
|
when N_Indexed_Component =>
|
|
return (N /= Prefix (Parent (N))
|
|
or else Is_Primary (Parent (N)));
|
|
|
|
when N_Qualified_Expression | N_Type_Conversion =>
|
|
return Is_Primary (Parent (N));
|
|
|
|
when N_Assignment_Statement | N_Object_Declaration =>
|
|
return (N = Expression (Parent (N)));
|
|
|
|
when N_Selected_Component =>
|
|
return Is_Primary (Parent (N));
|
|
|
|
when others =>
|
|
return False;
|
|
end case;
|
|
end Is_Primary;
|
|
|
|
-- Start of processing for Validate_Static_Object_Name
|
|
|
|
begin
|
|
if not In_Preelaborated_Unit
|
|
or else not Comes_From_Source (N)
|
|
or else In_Subprogram_Or_Concurrent_Unit
|
|
or else Ekind (Current_Scope) = E_Block
|
|
then
|
|
return;
|
|
|
|
-- Filter out cases where primary is default in a component declaration,
|
|
-- discriminant specification, or actual in a record type initialization
|
|
-- call.
|
|
|
|
-- Initialization call of internal types
|
|
|
|
elsif Nkind (Parent (N)) = N_Procedure_Call_Statement then
|
|
|
|
if Present (Parent (Parent (N)))
|
|
and then Nkind (Parent (Parent (N))) = N_Freeze_Entity
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
if Nkind (Name (Parent (N))) = N_Identifier
|
|
and then not Comes_From_Source (Entity (Name (Parent (N))))
|
|
then
|
|
return;
|
|
end if;
|
|
end if;
|
|
|
|
-- Error if the name is a primary in an expression. The parent must not
|
|
-- be an operator, or a selected component or an indexed component that
|
|
-- is itself a primary. Entities that are actuals do not need to be
|
|
-- checked, because the call itself will be diagnosed.
|
|
|
|
if Is_Primary (N)
|
|
and then (not Inside_A_Generic
|
|
or else Present (Enclosing_Generic_Body (N)))
|
|
then
|
|
if Ekind (Entity (N)) = E_Variable
|
|
or else Ekind (Entity (N)) in Formal_Object_Kind
|
|
then
|
|
Flag_Non_Static_Expr
|
|
("non-static object name in preelaborated unit", N);
|
|
|
|
-- We take the view that a constant defined in another preelaborated
|
|
-- unit is preelaborable, even though it may have a private type and
|
|
-- thus appear non-static in a client. This must be the intent of
|
|
-- the language, but currently is an RM gap ???
|
|
|
|
elsif Ekind (Entity (N)) = E_Constant
|
|
and then not Is_Static_Expression (N)
|
|
then
|
|
E := Entity (N);
|
|
|
|
if Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (N)))
|
|
and then
|
|
Enclosing_Lib_Unit_Node (N) /= Enclosing_Lib_Unit_Node (E)
|
|
and then (Is_Preelaborated (Scope (E))
|
|
or else Is_Pure (Scope (E))
|
|
or else (Present (Renamed_Object (E))
|
|
and then
|
|
Is_Entity_Name (Renamed_Object (E))
|
|
and then
|
|
(Is_Preelaborated
|
|
(Scope (Renamed_Object (E)))
|
|
or else
|
|
Is_Pure (Scope
|
|
(Renamed_Object (E))))))
|
|
then
|
|
null;
|
|
|
|
-- This is the error case
|
|
|
|
else
|
|
-- In GNAT mode, this is just a warning, to allow it to be
|
|
-- judiciously turned off. Otherwise it is a real error.
|
|
|
|
if GNAT_Mode then
|
|
Error_Msg_N
|
|
("?non-static constant in preelaborated unit", N);
|
|
else
|
|
Flag_Non_Static_Expr
|
|
("non-static constant in preelaborated unit", N);
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end Validate_Static_Object_Name;
|
|
|
|
end Sem_Cat;
|