-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2008, 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- --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- This spec also documents all GNAT implementation defined pragmas
with Exp_Tss; use Exp_Tss;
+with Namet; use Namet;
with Snames; use Snames;
with Types; use Types;
package Sem_Attr is
- type Attribute_Class_Array is array (Attribute_Id) of Boolean;
- -- Type used to build attribute classification flag arrays
-
-----------------------------------------
-- Implementation Dependent Attributes --
-----------------------------------------
---------------
Attribute_Asm_Input => True,
- -- Used only in conjunction with the Asm and Asm_Volatile subprograms
- -- in package Machine_Code to construct machine instructions. See
- -- documentation in package Machine_Code in file s-maccod.ads.
+ -- Used only in conjunction with the Asm subprograms in package
+ -- Machine_Code to construct machine instructions. See documentation
+ -- in package Machine_Code in file s-maccod.ads.
----------------
-- Asm_Output --
----------------
Attribute_Asm_Output => True,
- -- Used only in conjunction with the Asm and Asm_Volatile subprograms
- -- in package Machine_Code to construct machine instructions. See
- -- documentation in package Machine_Code in file s-maccod.ads.
+ -- Used only in conjunction with the Asm subprograms in package
+ -- Machine_Code to construct machine instructions. See documentation
+ -- in package Machine_Code in file s-maccod.ads.
---------------
-- AST_Entry --
-- absence of an enumeration representation clause. This is a static
-- attribute (i.e. the result is static if the argument is static).
+ --------------
+ -- Enum_Val --
+ --------------
+
+ Attribute_Enum_Val => True,
+ -- For every enumeration subtype S, S'Enum_Val denotes a function
+ -- with the following specification:
+ --
+ -- function S'Enum_Val (Arg : universal_integer) return S'Base;
+ --
+ -- This function performs the inverse transformation to Enum_Rep. Given
+ -- a representation value for the type, it returns the corresponding
+ -- enumeration value. Constraint_Error is raised if no value of the
+ -- enumeration type corresponds to the given integer value.
+
-----------------
-- Fixed_Value --
-----------------
-- attribute is primarily intended for use in implementation of the
-- standard input-output functions for fixed-point values.
+ Attribute_Invalid_Value => True,
+ -- For every scalar type, S'Invalid_Value designates an undefined value
+ -- of the type. If possible this value is an invalid value, and in fact
+ -- is identical to the value that would be set if Initialize_Scalars
+ -- mode were in effect (including the behavior of its value on
+ -- environment variables or binder switches). The intended use is
+ -- to set a value where initialization is required (e.g. as a result of
+ -- the coding standards in use), but logically no initialization is
+ -- needed, and the value should never be accessed.
+
------------------
-- Machine_Size --
------------------
--------------------
Attribute_Mechanism_Code => True,
- -- function'Mechanism_Code yeilds an integer code for the mechanism
+ -- function'Mechanism_Code yields an integer code for the mechanism
-- used for the result of function, and subprogram'Mechanism_Code (n)
-- yields the mechanism used for formal parameter number n (a static
-- integer value, 1 = first parameter). The code returned is:
-- A reference T'Null_Parameter denotes an (imaginary) object of type or
-- subtype T allocated at (machine) address zero. The attribute is
-- allowed only as the default expression of a formal parameter, or as
- -- an actual expression of a subporgram call. In either case, the
+ -- an actual expression of a subprogram call. In either case, the
-- subprogram must be imported.
--
-- The identity of the object is represented by the address zero in the
-- for constructing this definition in package System (see note above
-- in Default_Bit_Order description). The is a static attribute.
+ ---------------
+ -- Stub_Type --
+ ---------------
+
+ Attribute_Stub_Type => True,
+ -- The GNAT implementation of remote access-to-classwide types is
+ -- organised as described in AARM E.4(20.t): a value of an RACW type
+ -- (designating a remote object) is represented as a normal access
+ -- value, pointing to a "stub" object which in turn contains the
+ -- necessary information to contact the designated remote object. A
+ -- call on any dispatching operation of such a stub object does the
+ -- remote call, if necessary, using the information in the stub object
+ -- to locate the target partition, etc.
+ --
+ -- For a prefix T that denotes a remote access-to-classwide type,
+ -- T'Stub_Type denotes the type of the corresponding stub objects.
+ --
+ -- By construction, the layout of T'Stub_Type is identical to that of
+ -- System.Partition_Interface.RACW_Stub_Type (see implementation notes
+ -- in body of Exp_Dist).
+
-----------------
-- Target_Name --
-----------------
-- to convert this to an address using the same semantics as the
-- System.Storage_Elements.To_Address function. The important difference
-- is that this is a static attribute so it can be used in
- -- initializations in preealborate packages.
+ -- initializations in preelaborate packages.
----------------
-- Type_Class --
-- in appropriate contexts (i.e. in subtype marks, or as prefixes for
-- other attributes).
+ function Name_Implies_Lvalue_Prefix (Nam : Name_Id) return Boolean;
+ -- Determine whether the name of an attribute reference categorizes its
+ -- prefix as an lvalue. The following attributes fall under this bracket
+ -- by directly or indirectly modifying their prefixes.
+ -- Access
+ -- Address
+ -- Input
+ -- Read
+ -- Unchecked_Access
+ -- Unrestricted_Access
+
procedure Resolve_Attribute (N : Node_Id; Typ : Entity_Id);
-- Performs type resolution of attribute. If the attribute yields a
-- universal value, mark its type as that of the context. On the other
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