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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- A S P E C T S --
-- --
-- S p e c --
-- --
-- Copyright (C) 2010, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package defines the aspects that are recognized by GNAT in aspect
-- specifications. It also contains the subprograms for storing/retrieving
-- aspect specifications from the tree. The semantic processing for aspect
-- specifications is found in Sem_Ch13.Analyze_Aspect_Specifications.
with Namet; use Namet;
with Types; use Types;
package Aspects is
-- Type defining recognized aspects
type Aspect_Id is
(No_Aspect, -- Dummy entry for no aspect
Aspect_Ada_2005, -- GNAT
Aspect_Ada_2012, -- GNAT
Aspect_Address,
Aspect_Alignment,
Aspect_Atomic,
Aspect_Atomic_Components,
Aspect_Bit_Order,
Aspect_Component_Size,
Aspect_Discard_Names,
Aspect_External_Tag,
Aspect_Favor_Top_Level, -- GNAT
Aspect_Inline,
Aspect_Inline_Always, -- GNAT
Aspect_Input,
Aspect_Invariant,
Aspect_Machine_Radix,
Aspect_No_Return,
Aspect_Object_Size, -- GNAT
Aspect_Output,
Aspect_Pack,
Aspect_Persistent_BSS, -- GNAT
Aspect_Post,
Aspect_Pre,
Aspect_Predicate, -- GNAT???
Aspect_Preelaborable_Initialization,
Aspect_Pure_Function, -- GNAT
Aspect_Read,
Aspect_Shared, -- GNAT (equivalent to Atomic)
Aspect_Size,
Aspect_Storage_Pool,
Aspect_Storage_Size,
Aspect_Stream_Size,
Aspect_Suppress,
Aspect_Suppress_Debug_Info, -- GNAT
Aspect_Unchecked_Union,
Aspect_Universal_Aliasing, -- GNAT
Aspect_Unmodified, -- GNAT
Aspect_Unreferenced, -- GNAT
Aspect_Unreferenced_Objects, -- GNAT
Aspect_Unsuppress,
Aspect_Value_Size, -- GNAT
Aspect_Volatile,
Aspect_Volatile_Components,
Aspect_Warnings,
Aspect_Write); -- GNAT
-- The following array indicates aspects that accept 'Class
Class_Aspect_OK : constant array (Aspect_Id) of Boolean :=
(Aspect_Invariant => True,
Aspect_Pre => True,
Aspect_Predicate => True,
Aspect_Post => True,
others => False);
-- The following type is used for indicating allowed expression forms
type Aspect_Expression is
(Optional, -- Optional boolean expression
Expression, -- Required non-boolean expression
Name); -- Required name
-- The following array indicates what argument type is required
Aspect_Argument : constant array (Aspect_Id) of Aspect_Expression :=
(No_Aspect => Optional,
Aspect_Ada_2005 => Optional,
Aspect_Ada_2012 => Optional,
Aspect_Address => Expression,
Aspect_Alignment => Expression,
Aspect_Atomic => Optional,
Aspect_Atomic_Components => Optional,
Aspect_Bit_Order => Expression,
Aspect_Component_Size => Expression,
Aspect_Discard_Names => Optional,
Aspect_External_Tag => Expression,
Aspect_Favor_Top_Level => Optional,
Aspect_Inline => Optional,
Aspect_Inline_Always => Optional,
Aspect_Input => Name,
Aspect_Invariant => Expression,
Aspect_Machine_Radix => Expression,
Aspect_No_Return => Optional,
Aspect_Object_Size => Expression,
Aspect_Output => Name,
Aspect_Persistent_BSS => Optional,
Aspect_Pack => Optional,
Aspect_Post => Expression,
Aspect_Pre => Expression,
Aspect_Predicate => Expression,
Aspect_Preelaborable_Initialization => Optional,
Aspect_Pure_Function => Optional,
Aspect_Read => Name,
Aspect_Shared => Optional,
Aspect_Size => Expression,
Aspect_Storage_Pool => Name,
Aspect_Storage_Size => Expression,
Aspect_Stream_Size => Expression,
Aspect_Suppress => Name,
Aspect_Suppress_Debug_Info => Optional,
Aspect_Unchecked_Union => Optional,
Aspect_Universal_Aliasing => Optional,
Aspect_Unmodified => Optional,
Aspect_Unreferenced => Optional,
Aspect_Unreferenced_Objects => Optional,
Aspect_Unsuppress => Name,
Aspect_Value_Size => Expression,
Aspect_Volatile => Optional,
Aspect_Volatile_Components => Optional,
Aspect_Warnings => Name,
Aspect_Write => Name);
function Get_Aspect_Id (Name : Name_Id) return Aspect_Id;
pragma Inline (Get_Aspect_Id);
-- Given a name Nam, returns the corresponding aspect id value. If the name
-- does not match any aspect, then No_Aspect is returned as the result.
---------------------------------------------------
-- Handling of Aspect Specifications in the Tree --
---------------------------------------------------
-- Several kinds of declaration node permit aspect specifications in Ada
-- 2012 mode. If there was room in all the corresponding declaration nodes,
-- we could just have a field Aspect_Specifications pointing to a list of
-- nodes for the aspects (N_Aspect_Specification nodes). But there isn't
-- room, so we adopt a different approach.
-- The following subprograms provide access to a specialized interface
-- implemented internally with a hash table in the body, that provides
-- access to aspect specifications.
function Permits_Aspect_Specifications (N : Node_Id) return Boolean;
-- Returns True if the node N is a declaration node that permits aspect
-- specifications in the grammar. It is possible for other nodes to have
-- aspect specifications as a result of Rewrite or Replace calls.
function Aspect_Specifications (N : Node_Id) return List_Id;
-- Given a node N, returns the list of N_Aspect_Specification nodes that
-- are attached to this declaration node. If the node is in the class of
-- declaration nodes that permit aspect specifications, as defined by the
-- predicate above, and if their Has_Aspects flag is set to True, then this
-- will always be a non-empty list. If this flag is set to False, then
-- No_List is returned. Normally, the only nodes that have Has_Aspects set
-- True are the nodes for which Permits_Aspect_Specifications would return
-- True (i.e. the declaration nodes defined in the RM as permitting the
-- presence of Aspect_Specifications). However, it is possible for the
-- flag Has_Aspects to be set on other nodes as a result of Rewrite and
-- Replace calls, and this function may be used to retrieve the aspect
-- specifications for the original rewritten node in such cases.
procedure Set_Aspect_Specifications (N : Node_Id; L : List_Id);
-- The node N must be in the class of declaration nodes that permit aspect
-- specifications and the Has_Aspects flag must be False on entry. L must
-- be a non-empty list of N_Aspect_Specification nodes. This procedure sets
-- the Has_Aspects flag to True, and makes an entry that can be retrieved
-- by a subsequent Aspect_Specifications call. It is an error to call this
-- procedure with a node that does not permit aspect specifications, or a
-- node that has its Has_Aspects flag set True on entry, or with L being an
-- empty list or No_List.
procedure Move_Aspects (From : Node_Id; To : Node_Id);
-- Moves aspects from 'From' node to 'To' node. Has_Aspects (To) must be
-- False on entry. If Has_Aspects (From) is False, the call has no effect.
-- Otherwise the aspects are moved and on return Has_Aspects (To) is True,
-- and Has_Aspects (From) is False.
procedure Tree_Write;
-- Writes contents of Aspect_Specifications hash table to the tree file
procedure Tree_Read;
-- Reads contents of Aspect_Specifications hash table from the tree file
end Aspects;
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