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------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- T Y P E S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2009, 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 3, 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. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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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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-- This package contains host independent type definitions which are used
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-- in more than one unit in the compiler. They are gathered here for easy
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-- reference, although in some cases the full description is found in the
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-- relevant module which implements the definition. The main reason that they
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-- are not in their "natural" specs is that this would cause a lot of inter-
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-- spec dependencies, and in particular some awkward circular dependencies
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-- would have to be dealt with.
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-- WARNING: There is a C version of this package. Any changes to this source
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-- file must be properly reflected in the C header file types.h declarations.
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-- Note: the declarations in this package reflect an expectation that the host
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-- machine has an efficient integer base type with a range at least 32 bits
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-- 2s-complement. If there are any machines for which this is not a correct
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-- assumption, a significant number of changes will be required!
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with System;
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with Unchecked_Conversion;
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with Unchecked_Deallocation;
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package Types is
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pragma Preelaborate;
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-------------------------------
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-- General Use Integer Types --
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-------------------------------
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type Int is range -2 ** 31 .. +2 ** 31 - 1;
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-- Signed 32-bit integer
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type Dint is range -2 ** 63 .. +2 ** 63 - 1;
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-- Double length (64-bit) integer
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subtype Nat is Int range 0 .. Int'Last;
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-- Non-negative Int values
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subtype Pos is Int range 1 .. Int'Last;
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-- Positive Int values
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type Word is mod 2 ** 32;
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-- Unsigned 32-bit integer
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type Short is range -32768 .. +32767;
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for Short'Size use 16;
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-- 16-bit signed integer
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type Byte is mod 2 ** 8;
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for Byte'Size use 8;
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-- 8-bit unsigned integer
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type size_t is mod 2 ** Standard'Address_Size;
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-- Memory size value, for use in calls to C routines
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--------------------------------------
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-- 8-Bit Character and String Types --
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--------------------------------------
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-- We use Standard.Character and Standard.String freely, since we are
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-- compiling ourselves, and we properly implement the required 8-bit
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-- character code as required in Ada 95. This section defines a few
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-- general use constants and subtypes.
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EOF : constant Character := ASCII.SUB;
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-- The character SUB (16#1A#) is used in DOS and other systems derived
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-- from DOS (XP, NT etc) to signal the end of a text file. Internally
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-- all source files are ended by an EOF character, even on Unix systems.
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-- An EOF character acts as the end of file only as the last character
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-- of a source buffer, in any other position, it is treated as a blank
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-- if it appears between tokens, and as an illegal character otherwise.
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-- This makes life easier dealing with files that originated from DOS,
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-- including concatenated files with interspersed EOF characters.
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subtype Graphic_Character is Character range ' ' .. '~';
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-- Graphic characters, as defined in ARM
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subtype Line_Terminator is Character range ASCII.LF .. ASCII.CR;
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-- Line terminator characters (LF, VT, FF, CR)
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--
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-- This definition is dubious now that we have two more wide character
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-- sequences that constitute a line terminator. Every reference to this
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-- subtype needs checking to make sure the wide character case is handled
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-- appropriately. ???
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subtype Upper_Half_Character is
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Character range Character'Val (16#80#) .. Character'Val (16#FF#);
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-- Characters with the upper bit set
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type Character_Ptr is access all Character;
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type String_Ptr is access all String;
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-- Standard character and string pointers
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procedure Free is new Unchecked_Deallocation (String, String_Ptr);
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-- Procedure for freeing dynamically allocated String values
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subtype Big_String is String (Positive);
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type Big_String_Ptr is access all Big_String;
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for Big_String_Ptr'Storage_Size use 0;
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-- Virtual type for handling imported big strings
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function To_Big_String_Ptr is
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new Unchecked_Conversion (System.Address, Big_String_Ptr);
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-- Used to obtain Big_String_Ptr values from external addresses
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subtype Word_Hex_String is String (1 .. 8);
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-- Type used to represent Word value as 8 hex digits, with lower case
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-- letters for the alphabetic cases.
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function Get_Hex_String (W : Word) return Word_Hex_String;
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-- Convert word value to 8-character hex string
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-----------------------------------------
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-- Types Used for Text Buffer Handling --
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-----------------------------------------
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-- We can not use type String for text buffers, since we must use the
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-- standard 32-bit integer as an index value, since we count on all index
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-- values being the same size.
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type Text_Ptr is new Int;
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-- Type used for subscripts in text buffer
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type Text_Buffer is array (Text_Ptr range <>) of Character;
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-- Text buffer used to hold source file or library information file
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type Text_Buffer_Ptr is access all Text_Buffer;
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-- Text buffers for input files are allocated dynamically and this type
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-- is used to reference these text buffers.
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procedure Free is new Unchecked_Deallocation (Text_Buffer, Text_Buffer_Ptr);
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-- Procedure for freeing dynamically allocated text buffers
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------------------------------------------
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-- Types Used for Source Input Handling --
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------------------------------------------
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type Logical_Line_Number is range 0 .. Int'Last;
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for Logical_Line_Number'Size use 32;
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-- Line number type, used for storing logical line numbers (i.e. line
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-- numbers that include effects of any Source_Reference pragmas in the
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-- source file). The value zero indicates a line containing a source
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-- reference pragma.
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No_Line_Number : constant Logical_Line_Number := 0;
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-- Special value used to indicate no line number
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type Physical_Line_Number is range 1 .. Int'Last;
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for Physical_Line_Number'Size use 32;
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-- Line number type, used for storing physical line numbers (i.e. line
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-- numbers in the physical file being compiled, unaffected by the presence
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-- of source reference pragmas.
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type Column_Number is range 0 .. 32767;
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for Column_Number'Size use 16;
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-- Column number (assume that 2**15 - 1 is large enough). The range for
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-- this type is used to compute Hostparm.Max_Line_Length. See also the
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-- processing for -gnatyM in Stylesw).
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No_Column_Number : constant Column_Number := 0;
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-- Special value used to indicate no column number
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subtype Source_Buffer is Text_Buffer;
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-- Type used to store text of a source file . The buffer for the main
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-- source (the source specified on the command line) has a lower bound
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-- starting at zero. Subsequent subsidiary sources have lower bounds
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-- which are one greater than the previous upper bound.
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subtype Big_Source_Buffer is Text_Buffer (0 .. Text_Ptr'Last);
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-- This is a virtual type used as the designated type of the access type
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-- Source_Buffer_Ptr, see Osint.Read_Source_File for details.
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type Source_Buffer_Ptr is access all Big_Source_Buffer;
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for Source_Buffer_Ptr'Storage_Size use 0;
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-- Pointer to source buffer. We use virtual origin addressing for source
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-- buffers, with thin pointers. The pointer points to a virtual instance
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-- of type Big_Source_Buffer, where the actual type is in fact of type
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-- Source_Buffer. The address is adjusted so that the virtual origin
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-- addressing works correctly. See Osint.Read_Source_Buffer for further
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-- details.
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subtype Source_Ptr is Text_Ptr;
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-- Type used to represent a source location, which is a subscript of a
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-- character in the source buffer. As noted above, different source buffers
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-- have different ranges, so it is possible to tell from a Source_Ptr value
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-- which source it refers to. Note that negative numbers are allowed to
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-- accommodate the following special values.
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No_Location : constant Source_Ptr := -1;
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-- Value used to indicate no source position set in a node. A test for a
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-- Source_Ptr value being > No_Location is the approved way to test for a
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-- standard value that does not include No_Location or any of the following
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-- special definitions. One important use of No_Location is to label
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-- generated nodes that we don't want the debugger to see in normal mode
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-- (very often we conditionalize so that we set No_Location in normal mode
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-- and the corresponding source line in -gnatD mode).
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Standard_Location : constant Source_Ptr := -2;
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-- Used for all nodes in the representation of package Standard other than
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-- nodes representing the contents of Standard.ASCII. Note that testing for
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-- a value being <= Standard_Location tests for both Standard_Location and
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-- for Standard_ASCII_Location.
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Standard_ASCII_Location : constant Source_Ptr := -3;
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-- Used for all nodes in the presentation of package Standard.ASCII
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System_Location : constant Source_Ptr := -4;
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-- Used to identify locations of pragmas scanned by Targparm, where we know
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-- the location is in System, but we don't know exactly what line.
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First_Source_Ptr : constant Source_Ptr := 0;
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-- Starting source pointer index value for first source program
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-------------------------------------
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-- Range Definitions for Tree Data --
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-------------------------------------
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-- The tree has fields that can hold any of the following types:
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-- Pointers to other tree nodes (type Node_Id)
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-- List pointers (type List_Id)
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-- Element list pointers (type Elist_Id)
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-- Names (type Name_Id)
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-- Strings (type String_Id)
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-- Universal integers (type Uint)
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-- Universal reals (type Ureal)
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-- In most contexts, the strongly typed interface determines which of
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-- these types is present. However, there are some situations (involving
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-- untyped traversals of the tree), where it is convenient to be easily
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-- able to distinguish these values. The underlying representation in all
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-- cases is an integer type Union_Id, and we ensure that the range of
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-- the various possible values for each of the above types is disjoint
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-- so that this distinction is possible.
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type Union_Id is new Int;
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-- The type in the tree for a union of possible ID values
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-- Note: it is also helpful for debugging purposes to make these ranges
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-- distinct. If a bug leads to misidentification of a value, then it will
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-- typically result in an out of range value and a Constraint_Error.
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List_Low_Bound : constant := -100_000_000;
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-- The List_Id values are subscripts into an array of list headers which
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-- has List_Low_Bound as its lower bound. This value is chosen so that all
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-- List_Id values are negative, and the value zero is in the range of both
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-- List_Id and Node_Id values (see further description below).
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List_High_Bound : constant := 0;
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-- Maximum List_Id subscript value. This allows up to 100 million list Id
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-- values, which is in practice infinite, and there is no need to check the
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-- range. The range overlaps the node range by one element (with value
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-- zero), which is used both for the Empty node, and for indicating no
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-- list. The fact that the same value is used is convenient because it
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-- means that the default value of Empty applies to both nodes and lists,
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-- and also is more efficient to test for.
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Node_Low_Bound : constant := 0;
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-- The tree Id values start at zero, because we use zero for Empty (to
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-- allow a zero test for Empty). Actual tree node subscripts start at 0
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-- since Empty is a legitimate node value.
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Node_High_Bound : constant := 099_999_999;
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-- Maximum number of nodes that can be allocated is 100 million, which
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-- is in practice infinite, and there is no need to check the range.
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Elist_Low_Bound : constant := 100_000_000;
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-- The Elist_Id values are subscripts into an array of elist headers which
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-- has Elist_Low_Bound as its lower bound.
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Elist_High_Bound : constant := 199_999_999;
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-- Maximum Elist_Id subscript value. This allows up to 100 million Elists,
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-- which is in practice infinite and there is no need to check the range.
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Elmt_Low_Bound : constant := 200_000_000;
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-- Low bound of element Id values. The use of these values is internal to
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-- the Elists package, but the definition of the range is included here
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-- since it must be disjoint from other Id values. The Elmt_Id values are
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-- subscripts into an array of list elements which has this as lower bound.
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Elmt_High_Bound : constant := 299_999_999;
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-- Upper bound of Elmt_Id values. This allows up to 100 million element
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-- list members, which is in practice infinite (no range check needed).
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Names_Low_Bound : constant := 300_000_000;
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-- Low bound for name Id values
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Names_High_Bound : constant := 399_999_999;
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-- Maximum number of names that can be allocated is 100 million, which is
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-- in practice infinite and there is no need to check the range.
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Strings_Low_Bound : constant := 400_000_000;
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-- Low bound for string Id values
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Strings_High_Bound : constant := 499_999_999;
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-- Maximum number of strings that can be allocated is 100 million, which
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-- is in practice infinite and there is no need to check the range.
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Ureal_Low_Bound : constant := 500_000_000;
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-- Low bound for Ureal values
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Ureal_High_Bound : constant := 599_999_999;
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-- Maximum number of Ureal values stored is 100_000_000 which is in
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-- practice infinite so that no check is required.
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Uint_Low_Bound : constant := 600_000_000;
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-- Low bound for Uint values
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Uint_Table_Start : constant := 2_000_000_000;
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|
|
-- Location where table entries for universal integers start (see
|
340 |
|
|
-- Uintp spec for details of the representation of Uint values).
|
341 |
|
|
|
342 |
|
|
Uint_High_Bound : constant := 2_099_999_999;
|
343 |
|
|
-- The range of Uint values is very large, since a substantial part
|
344 |
|
|
-- of this range is used to store direct values, see Uintp for details.
|
345 |
|
|
|
346 |
|
|
-- The following subtype definitions are used to provide convenient names
|
347 |
|
|
-- for membership tests on Int values to see what data type range they
|
348 |
|
|
-- lie in. Such tests appear only in the lowest level packages.
|
349 |
|
|
|
350 |
|
|
subtype List_Range is Union_Id
|
351 |
|
|
range List_Low_Bound .. List_High_Bound;
|
352 |
|
|
|
353 |
|
|
subtype Node_Range is Union_Id
|
354 |
|
|
range Node_Low_Bound .. Node_High_Bound;
|
355 |
|
|
|
356 |
|
|
subtype Elist_Range is Union_Id
|
357 |
|
|
range Elist_Low_Bound .. Elist_High_Bound;
|
358 |
|
|
|
359 |
|
|
subtype Elmt_Range is Union_Id
|
360 |
|
|
range Elmt_Low_Bound .. Elmt_High_Bound;
|
361 |
|
|
|
362 |
|
|
subtype Names_Range is Union_Id
|
363 |
|
|
range Names_Low_Bound .. Names_High_Bound;
|
364 |
|
|
|
365 |
|
|
subtype Strings_Range is Union_Id
|
366 |
|
|
range Strings_Low_Bound .. Strings_High_Bound;
|
367 |
|
|
|
368 |
|
|
subtype Uint_Range is Union_Id
|
369 |
|
|
range Uint_Low_Bound .. Uint_High_Bound;
|
370 |
|
|
|
371 |
|
|
subtype Ureal_Range is Union_Id
|
372 |
|
|
range Ureal_Low_Bound .. Ureal_High_Bound;
|
373 |
|
|
|
374 |
|
|
----------------------------
|
375 |
|
|
-- Types for Atree Package --
|
376 |
|
|
----------------------------
|
377 |
|
|
|
378 |
|
|
-- Node_Id values are used to identify nodes in the tree. They are
|
379 |
|
|
-- subscripts into the Node table declared in package Tree. Note that
|
380 |
|
|
-- the special values Empty and Error are subscripts into this table,
|
381 |
|
|
-- See package Atree for further details.
|
382 |
|
|
|
383 |
|
|
type Node_Id is range Node_Low_Bound .. Node_High_Bound;
|
384 |
|
|
-- Type used to identify nodes in the tree
|
385 |
|
|
|
386 |
|
|
subtype Entity_Id is Node_Id;
|
387 |
|
|
-- A synonym for node types, used in the entity package to refer to nodes
|
388 |
|
|
-- that are entities (i.e. nodes with an Nkind of N_Defining_xxx) All such
|
389 |
|
|
-- nodes are extended nodes and these are the only extended nodes, so that
|
390 |
|
|
-- in practice entity and extended nodes are synonymous.
|
391 |
|
|
|
392 |
|
|
subtype Node_Or_Entity_Id is Node_Id;
|
393 |
|
|
-- A synonym for node types, used in cases where a given value may be used
|
394 |
|
|
-- to represent either a node or an entity. We like to minimize such uses
|
395 |
|
|
-- for obvious reasons of logical type consistency, but where such uses
|
396 |
|
|
-- occur, they should be documented by use of this type.
|
397 |
|
|
|
398 |
|
|
Empty : constant Node_Id := Node_Low_Bound;
|
399 |
|
|
-- Used to indicate null node. A node is actually allocated with this
|
400 |
|
|
-- Id value, so that Nkind (Empty) = N_Empty. Note that Node_Low_Bound
|
401 |
|
|
-- is zero, so Empty = No_List = zero.
|
402 |
|
|
|
403 |
|
|
Empty_List_Or_Node : constant := 0;
|
404 |
|
|
-- This constant is used in situations (e.g. initializing empty fields)
|
405 |
|
|
-- where the value set will be used to represent either an empty node
|
406 |
|
|
-- or a non-existent list, depending on the context.
|
407 |
|
|
|
408 |
|
|
Error : constant Node_Id := Node_Low_Bound + 1;
|
409 |
|
|
-- Used to indicate that there was an error in the source program. A node
|
410 |
|
|
-- is actually allocated at this address, so that Nkind (Error) = N_Error.
|
411 |
|
|
|
412 |
|
|
Empty_Or_Error : constant Node_Id := Error;
|
413 |
|
|
-- Since Empty and Error are the first two Node_Id values, the test for
|
414 |
|
|
-- N <= Empty_Or_Error tests to see if N is Empty or Error. This definition
|
415 |
|
|
-- provides convenient self-documentation for such tests.
|
416 |
|
|
|
417 |
|
|
First_Node_Id : constant Node_Id := Node_Low_Bound;
|
418 |
|
|
-- Subscript of first allocated node. Note that Empty and Error are both
|
419 |
|
|
-- allocated nodes, whose Nkind fields can be accessed without error.
|
420 |
|
|
|
421 |
|
|
------------------------------
|
422 |
|
|
-- Types for Nlists Package --
|
423 |
|
|
------------------------------
|
424 |
|
|
|
425 |
|
|
-- List_Id values are used to identify node lists in the tree. They are
|
426 |
|
|
-- subscripts into the Lists table declared in package Tree. Note that the
|
427 |
|
|
-- special value Error_List is a subscript in this table, but the value
|
428 |
|
|
-- No_List is *not* a valid subscript, and any attempt to apply list
|
429 |
|
|
-- operations to No_List will cause a (detected) error.
|
430 |
|
|
|
431 |
|
|
type List_Id is range List_Low_Bound .. List_High_Bound;
|
432 |
|
|
-- Type used to identify a node list
|
433 |
|
|
|
434 |
|
|
No_List : constant List_Id := List_High_Bound;
|
435 |
|
|
-- Used to indicate absence of a list. Note that the value is zero, which
|
436 |
|
|
-- is the same as Empty, which is helpful in initializing nodes where a
|
437 |
|
|
-- value of zero can represent either an empty node or an empty list.
|
438 |
|
|
|
439 |
|
|
Error_List : constant List_Id := List_Low_Bound;
|
440 |
|
|
-- Used to indicate that there was an error in the source program in a
|
441 |
|
|
-- context which would normally require a list. This node appears to be
|
442 |
|
|
-- an empty list to the list operations (a null list is actually allocated
|
443 |
|
|
-- which has this Id value).
|
444 |
|
|
|
445 |
|
|
First_List_Id : constant List_Id := Error_List;
|
446 |
|
|
-- Subscript of first allocated list header
|
447 |
|
|
|
448 |
|
|
------------------------------
|
449 |
|
|
-- Types for Elists Package --
|
450 |
|
|
------------------------------
|
451 |
|
|
|
452 |
|
|
-- Element list Id values are used to identify element lists stored in the
|
453 |
|
|
-- tree (see package Atree for further details). They are formed by adding
|
454 |
|
|
-- a bias (Element_List_Bias) to subscript values in the same array that is
|
455 |
|
|
-- used for node list headers.
|
456 |
|
|
|
457 |
|
|
type Elist_Id is range Elist_Low_Bound .. Elist_High_Bound;
|
458 |
|
|
-- Type used to identify an element list (Elist header table subscript)
|
459 |
|
|
|
460 |
|
|
No_Elist : constant Elist_Id := Elist_Low_Bound;
|
461 |
|
|
-- Used to indicate absence of an element list. Note that this is not
|
462 |
|
|
-- an actual Elist header, so element list operations on this value
|
463 |
|
|
-- are not valid.
|
464 |
|
|
|
465 |
|
|
First_Elist_Id : constant Elist_Id := No_Elist + 1;
|
466 |
|
|
-- Subscript of first allocated Elist header
|
467 |
|
|
|
468 |
|
|
-- Element Id values are used to identify individual elements of an
|
469 |
|
|
-- element list (see package Elists for further details).
|
470 |
|
|
|
471 |
|
|
type Elmt_Id is range Elmt_Low_Bound .. Elmt_High_Bound;
|
472 |
|
|
-- Type used to identify an element list
|
473 |
|
|
|
474 |
|
|
No_Elmt : constant Elmt_Id := Elmt_Low_Bound;
|
475 |
|
|
-- Used to represent empty element
|
476 |
|
|
|
477 |
|
|
First_Elmt_Id : constant Elmt_Id := No_Elmt + 1;
|
478 |
|
|
-- Subscript of first allocated Elmt table entry
|
479 |
|
|
|
480 |
|
|
-------------------------------
|
481 |
|
|
-- Types for Stringt Package --
|
482 |
|
|
-------------------------------
|
483 |
|
|
|
484 |
|
|
-- String_Id values are used to identify entries in the strings table. They
|
485 |
|
|
-- are subscripts into the strings table defined in package Strings.
|
486 |
|
|
|
487 |
|
|
-- Note that with only a few exceptions, which are clearly documented, the
|
488 |
|
|
-- type String_Id should be regarded as a private type. In particular it is
|
489 |
|
|
-- never appropriate to perform arithmetic operations using this type.
|
490 |
|
|
|
491 |
|
|
type String_Id is range Strings_Low_Bound .. Strings_High_Bound;
|
492 |
|
|
-- Type used to identify entries in the strings table
|
493 |
|
|
|
494 |
|
|
No_String : constant String_Id := Strings_Low_Bound;
|
495 |
|
|
-- Used to indicate missing string Id. Note that the value zero is used
|
496 |
|
|
-- to indicate a missing data value for all the Int types in this section.
|
497 |
|
|
|
498 |
|
|
First_String_Id : constant String_Id := No_String + 1;
|
499 |
|
|
-- First subscript allocated in string table
|
500 |
|
|
|
501 |
|
|
-------------------------
|
502 |
|
|
-- Character Code Type --
|
503 |
|
|
-------------------------
|
504 |
|
|
|
505 |
|
|
-- The type Char is used for character data internally in the compiler, but
|
506 |
|
|
-- character codes in the source are represented by the Char_Code type.
|
507 |
|
|
-- Each character literal in the source is interpreted as being one of the
|
508 |
|
|
-- 16#8000_0000 possible Wide_Wide_Character codes, and a unique Integer
|
509 |
|
|
-- Value is assigned, corresponding to the UTF_32 value, which also
|
510 |
|
|
-- corresponds to the POS value in the Wide_Wide_Character type, and also
|
511 |
|
|
-- corresponds to the POS value in the Wide_Character and Character types
|
512 |
|
|
-- for values that are in appropriate range. String literals are similarly
|
513 |
|
|
-- interpreted as a sequence of such codes.
|
514 |
|
|
|
515 |
|
|
type Char_Code_Base is mod 2 ** 32;
|
516 |
|
|
for Char_Code_Base'Size use 32;
|
517 |
|
|
|
518 |
|
|
subtype Char_Code is Char_Code_Base range 0 .. 16#7FFF_FFFF#;
|
519 |
|
|
for Char_Code'Value_Size use 32;
|
520 |
|
|
for Char_Code'Object_Size use 32;
|
521 |
|
|
|
522 |
|
|
function Get_Char_Code (C : Character) return Char_Code;
|
523 |
|
|
pragma Inline (Get_Char_Code);
|
524 |
|
|
-- Function to obtain internal character code from source character. For
|
525 |
|
|
-- the moment, the internal character code is simply the Pos value of the
|
526 |
|
|
-- input source character, but we provide this interface for possible
|
527 |
|
|
-- later support of alternative character sets.
|
528 |
|
|
|
529 |
|
|
function In_Character_Range (C : Char_Code) return Boolean;
|
530 |
|
|
pragma Inline (In_Character_Range);
|
531 |
|
|
-- Determines if the given character code is in range of type Character,
|
532 |
|
|
-- and if so, returns True. If not, returns False.
|
533 |
|
|
|
534 |
|
|
function In_Wide_Character_Range (C : Char_Code) return Boolean;
|
535 |
|
|
pragma Inline (In_Wide_Character_Range);
|
536 |
|
|
-- Determines if the given character code is in range of the type
|
537 |
|
|
-- Wide_Character, and if so, returns True. If not, returns False.
|
538 |
|
|
|
539 |
|
|
function Get_Character (C : Char_Code) return Character;
|
540 |
|
|
pragma Inline (Get_Character);
|
541 |
|
|
-- For a character C that is in Character range (see above function), this
|
542 |
|
|
-- function returns the corresponding Character value. It is an error to
|
543 |
|
|
-- call Get_Character if C is not in Character range.
|
544 |
|
|
|
545 |
|
|
function Get_Wide_Character (C : Char_Code) return Wide_Character;
|
546 |
|
|
-- For a character C that is in Wide_Character range (see above function),
|
547 |
|
|
-- this function returns the corresponding Wide_Character value. It is an
|
548 |
|
|
-- error to call Get_Wide_Character if C is not in Wide_Character range.
|
549 |
|
|
|
550 |
|
|
---------------------------------------
|
551 |
|
|
-- Types used for Library Management --
|
552 |
|
|
---------------------------------------
|
553 |
|
|
|
554 |
|
|
type Unit_Number_Type is new Int;
|
555 |
|
|
-- Unit number. The main source is unit 0, and subsidiary sources have
|
556 |
|
|
-- non-zero numbers starting with 1. Unit numbers are used to index the
|
557 |
|
|
-- file table in Lib.
|
558 |
|
|
|
559 |
|
|
Main_Unit : constant Unit_Number_Type := 0;
|
560 |
|
|
-- Unit number value for main unit
|
561 |
|
|
|
562 |
|
|
No_Unit : constant Unit_Number_Type := -1;
|
563 |
|
|
-- Special value used to signal no unit
|
564 |
|
|
|
565 |
|
|
type Source_File_Index is new Int range -1 .. Int'Last;
|
566 |
|
|
-- Type used to index the source file table (see package Sinput)
|
567 |
|
|
|
568 |
|
|
Internal_Source_File : constant Source_File_Index :=
|
569 |
|
|
Source_File_Index'First;
|
570 |
|
|
-- Value used to indicate the buffer for the source-code-like strings
|
571 |
|
|
-- internally created withing the compiler (see package Sinput)
|
572 |
|
|
|
573 |
|
|
No_Source_File : constant Source_File_Index := 0;
|
574 |
|
|
-- Value used to indicate no source file present
|
575 |
|
|
|
576 |
|
|
-----------------------------------
|
577 |
|
|
-- Representation of Time Stamps --
|
578 |
|
|
-----------------------------------
|
579 |
|
|
|
580 |
|
|
-- All compiled units are marked with a time stamp which is derived from
|
581 |
|
|
-- the source file (we assume that the host system has the concept of a
|
582 |
|
|
-- file time stamp which is modified when a file is modified). These
|
583 |
|
|
-- time stamps are used to ensure consistency of the set of units that
|
584 |
|
|
-- constitutes a library. Time stamps are 12 character strings with
|
585 |
|
|
-- with the following format:
|
586 |
|
|
|
587 |
|
|
-- YYYYMMDDHHMMSS
|
588 |
|
|
|
589 |
|
|
-- YYYY year
|
590 |
|
|
-- MM month (2 digits 01-12)
|
591 |
|
|
-- DD day (2 digits 01-31)
|
592 |
|
|
-- HH hour (2 digits 00-23)
|
593 |
|
|
-- MM minutes (2 digits 00-59)
|
594 |
|
|
-- SS seconds (2 digits 00-59)
|
595 |
|
|
|
596 |
|
|
-- In the case of Unix systems (and other systems which keep the time in
|
597 |
|
|
-- GMT), the time stamp is the GMT time of the file, not the local time.
|
598 |
|
|
-- This solves problems in using libraries across networks with clients
|
599 |
|
|
-- spread across multiple time-zones.
|
600 |
|
|
|
601 |
|
|
Time_Stamp_Length : constant := 14;
|
602 |
|
|
-- Length of time stamp value
|
603 |
|
|
|
604 |
|
|
subtype Time_Stamp_Index is Natural range 1 .. Time_Stamp_Length;
|
605 |
|
|
type Time_Stamp_Type is new String (Time_Stamp_Index);
|
606 |
|
|
-- Type used to represent time stamp
|
607 |
|
|
|
608 |
|
|
Empty_Time_Stamp : constant Time_Stamp_Type := (others => ' ');
|
609 |
|
|
-- Value representing an empty or missing time stamp. Looks less than any
|
610 |
|
|
-- real time stamp if two time stamps are compared. Note that although this
|
611 |
|
|
-- is not private, clients should not rely on the exact way in which this
|
612 |
|
|
-- string is represented, and instead should use the subprograms below.
|
613 |
|
|
|
614 |
|
|
Dummy_Time_Stamp : constant Time_Stamp_Type := (others => '0');
|
615 |
|
|
-- This is used for dummy time stamp values used in the D lines for
|
616 |
|
|
-- non-existent files, and is intended to be an impossible value.
|
617 |
|
|
|
618 |
|
|
function "=" (Left, Right : Time_Stamp_Type) return Boolean;
|
619 |
|
|
function "<=" (Left, Right : Time_Stamp_Type) return Boolean;
|
620 |
|
|
function ">=" (Left, Right : Time_Stamp_Type) return Boolean;
|
621 |
|
|
function "<" (Left, Right : Time_Stamp_Type) return Boolean;
|
622 |
|
|
function ">" (Left, Right : Time_Stamp_Type) return Boolean;
|
623 |
|
|
-- Comparison functions on time stamps. Note that two time stamps are
|
624 |
|
|
-- defined as being equal if they have the same day/month/year and the
|
625 |
|
|
-- hour/minutes/seconds values are within 2 seconds of one another. This
|
626 |
|
|
-- deals with rounding effects in library file time stamps caused by
|
627 |
|
|
-- copying operations during installation. We have particularly noticed
|
628 |
|
|
-- that WinNT seems susceptible to such changes.
|
629 |
|
|
--
|
630 |
|
|
-- Note : the Empty_Time_Stamp value looks equal to itself, and less than
|
631 |
|
|
-- any non-empty time stamp value.
|
632 |
|
|
|
633 |
|
|
procedure Split_Time_Stamp
|
634 |
|
|
(TS : Time_Stamp_Type;
|
635 |
|
|
Year : out Nat;
|
636 |
|
|
Month : out Nat;
|
637 |
|
|
Day : out Nat;
|
638 |
|
|
Hour : out Nat;
|
639 |
|
|
Minutes : out Nat;
|
640 |
|
|
Seconds : out Nat);
|
641 |
|
|
-- Given a time stamp, decompose it into its components
|
642 |
|
|
|
643 |
|
|
procedure Make_Time_Stamp
|
644 |
|
|
(Year : Nat;
|
645 |
|
|
Month : Nat;
|
646 |
|
|
Day : Nat;
|
647 |
|
|
Hour : Nat;
|
648 |
|
|
Minutes : Nat;
|
649 |
|
|
Seconds : Nat;
|
650 |
|
|
TS : out Time_Stamp_Type);
|
651 |
|
|
-- Given the components of a time stamp, initialize the value
|
652 |
|
|
|
653 |
|
|
-----------------------------------------------
|
654 |
|
|
-- Types used for Pragma Suppress Management --
|
655 |
|
|
-----------------------------------------------
|
656 |
|
|
|
657 |
|
|
type Check_Id is new Nat;
|
658 |
|
|
-- Type used to represent a check id
|
659 |
|
|
|
660 |
|
|
No_Check_Id : constant := 0;
|
661 |
|
|
-- Check_Id value used to indicate no check
|
662 |
|
|
|
663 |
|
|
Access_Check : constant := 1;
|
664 |
|
|
Accessibility_Check : constant := 2;
|
665 |
|
|
Alignment_Check : constant := 3;
|
666 |
|
|
Discriminant_Check : constant := 4;
|
667 |
|
|
Division_Check : constant := 5;
|
668 |
|
|
Elaboration_Check : constant := 6;
|
669 |
|
|
Index_Check : constant := 7;
|
670 |
|
|
Length_Check : constant := 8;
|
671 |
|
|
Overflow_Check : constant := 9;
|
672 |
|
|
Range_Check : constant := 10;
|
673 |
|
|
Storage_Check : constant := 11;
|
674 |
|
|
Tag_Check : constant := 12;
|
675 |
|
|
Validity_Check : constant := 13;
|
676 |
|
|
-- Values used to represent individual predefined checks
|
677 |
|
|
|
678 |
|
|
All_Checks : constant := 14;
|
679 |
|
|
-- Value used to represent All_Checks value
|
680 |
|
|
|
681 |
|
|
subtype Predefined_Check_Id is Check_Id range 1 .. All_Checks;
|
682 |
|
|
-- Subtype for predefined checks, including All_Checks
|
683 |
|
|
|
684 |
|
|
-- The following array contains an entry for each recognized check name
|
685 |
|
|
-- for pragma Suppress. It is used to represent current settings of scope
|
686 |
|
|
-- based suppress actions from pragma Suppress or command line settings.
|
687 |
|
|
|
688 |
|
|
-- Note: when Suppress_Array (All_Checks) is True, then generally all other
|
689 |
|
|
-- specific check entries are set True, except for the Elaboration_Check
|
690 |
|
|
-- entry which is set only if an explicit Suppress for this check is given.
|
691 |
|
|
-- The reason for this non-uniformity is that we do not want All_Checks to
|
692 |
|
|
-- suppress elaboration checking when using the static elaboration model.
|
693 |
|
|
-- We recognize only an explicit suppress of Elaboration_Check as a signal
|
694 |
|
|
-- that the static elaboration checking should skip a compile time check.
|
695 |
|
|
|
696 |
|
|
type Suppress_Array is array (Predefined_Check_Id) of Boolean;
|
697 |
|
|
pragma Pack (Suppress_Array);
|
698 |
|
|
|
699 |
|
|
-- To add a new check type to GNAT, the following steps are required:
|
700 |
|
|
|
701 |
|
|
-- 1. Add an entry to Snames spec and body for the new name
|
702 |
|
|
-- 2. Add an entry to the definition of Check_Id above
|
703 |
|
|
-- 3. Add a new function to Checks to handle the new check test
|
704 |
|
|
-- 4. Add a new Do_xxx_Check flag to Sinfo (if required)
|
705 |
|
|
-- 5. Add appropriate checks for the new test
|
706 |
|
|
|
707 |
|
|
-----------------------------------
|
708 |
|
|
-- Global Exception Declarations --
|
709 |
|
|
-----------------------------------
|
710 |
|
|
|
711 |
|
|
-- This section contains declarations of exceptions that are used
|
712 |
|
|
-- throughout the compiler or in other GNAT tools.
|
713 |
|
|
|
714 |
|
|
Unrecoverable_Error : exception;
|
715 |
|
|
-- This exception is raised to immediately terminate the compilation of the
|
716 |
|
|
-- current source program. Used in situations where things are bad enough
|
717 |
|
|
-- that it doesn't seem worth continuing (e.g. max errors reached, or a
|
718 |
|
|
-- required file is not found). Also raised when the compiler finds itself
|
719 |
|
|
-- in trouble after an error (see Comperr).
|
720 |
|
|
|
721 |
|
|
Terminate_Program : exception;
|
722 |
|
|
-- This exception is raised to immediately terminate the tool being
|
723 |
|
|
-- executed. Each tool where this exception may be raised must have a
|
724 |
|
|
-- single exception handler that contains only a null statement and that is
|
725 |
|
|
-- the last statement of the program. If needed, procedure Set_Exit_Status
|
726 |
|
|
-- is called with the appropriate exit status before raising
|
727 |
|
|
-- Terminate_Program.
|
728 |
|
|
|
729 |
|
|
---------------------------------
|
730 |
|
|
-- Parameter Mechanism Control --
|
731 |
|
|
---------------------------------
|
732 |
|
|
|
733 |
|
|
-- Function and parameter entities have a field that records the
|
734 |
|
|
-- passing mechanism. See specification of Sem_Mech for full details.
|
735 |
|
|
-- The following subtype is used to represent values of this type:
|
736 |
|
|
|
737 |
|
|
subtype Mechanism_Type is Int range -18 .. Int'Last;
|
738 |
|
|
-- Type used to represent a mechanism value. This is a subtype rather
|
739 |
|
|
-- than a type to avoid some annoying processing problems with certain
|
740 |
|
|
-- routines in Einfo (processing them to create the corresponding C).
|
741 |
|
|
|
742 |
|
|
------------------------------
|
743 |
|
|
-- Run-Time Exception Codes --
|
744 |
|
|
------------------------------
|
745 |
|
|
|
746 |
|
|
-- When the code generator generates a run-time exception, it provides a
|
747 |
|
|
-- reason code which is one of the following. This reason code is used to
|
748 |
|
|
-- select the appropriate run-time routine to be called, determining both
|
749 |
|
|
-- the exception to be raised, and the message text to be added.
|
750 |
|
|
|
751 |
|
|
-- The prefix CE/PE/SE indicates the exception to be raised
|
752 |
|
|
-- CE = Constraint_Error
|
753 |
|
|
-- PE = Program_Error
|
754 |
|
|
-- SE = Storage_Error
|
755 |
|
|
|
756 |
|
|
-- The remaining part of the name indicates the message text to be added,
|
757 |
|
|
-- where all letters are lower case, and underscores are converted to
|
758 |
|
|
-- spaces (for example CE_Invalid_Data adds the text "invalid data").
|
759 |
|
|
|
760 |
|
|
-- To add a new code, you need to do the following:
|
761 |
|
|
|
762 |
|
|
-- 1. Modify the type and subtype declarations below appropriately,
|
763 |
|
|
-- keeping things in alphabetical order.
|
764 |
|
|
|
765 |
|
|
-- 2. Modify the corresponding definitions in types.h, including
|
766 |
|
|
-- the definition of last_reason_code.
|
767 |
|
|
|
768 |
|
|
-- 3. Add a new routine in Ada.Exceptions with the appropriate call
|
769 |
|
|
-- and static string constant. Note that there is more than one
|
770 |
|
|
-- version of a-except.adb which must be modified.
|
771 |
|
|
|
772 |
|
|
type RT_Exception_Code is
|
773 |
|
|
(CE_Access_Check_Failed, -- 00
|
774 |
|
|
CE_Access_Parameter_Is_Null, -- 01
|
775 |
|
|
CE_Discriminant_Check_Failed, -- 02
|
776 |
|
|
CE_Divide_By_Zero, -- 03
|
777 |
|
|
CE_Explicit_Raise, -- 04
|
778 |
|
|
CE_Index_Check_Failed, -- 05
|
779 |
|
|
CE_Invalid_Data, -- 06
|
780 |
|
|
CE_Length_Check_Failed, -- 07
|
781 |
|
|
CE_Null_Exception_Id, -- 08
|
782 |
|
|
CE_Null_Not_Allowed, -- 09
|
783 |
|
|
CE_Overflow_Check_Failed, -- 10
|
784 |
|
|
CE_Partition_Check_Failed, -- 11
|
785 |
|
|
CE_Range_Check_Failed, -- 12
|
786 |
|
|
CE_Tag_Check_Failed, -- 13
|
787 |
|
|
|
788 |
|
|
PE_Access_Before_Elaboration, -- 14
|
789 |
|
|
PE_Accessibility_Check_Failed, -- 15
|
790 |
|
|
PE_Address_Of_Intrinsic, -- 16
|
791 |
|
|
PE_All_Guards_Closed, -- 17
|
792 |
|
|
PE_Current_Task_In_Entry_Body, -- 18
|
793 |
|
|
PE_Duplicated_Entry_Address, -- 19
|
794 |
|
|
PE_Explicit_Raise, -- 20
|
795 |
|
|
PE_Finalize_Raised_Exception, -- 21
|
796 |
|
|
PE_Implicit_Return, -- 22
|
797 |
|
|
PE_Misaligned_Address_Value, -- 23
|
798 |
|
|
PE_Missing_Return, -- 24
|
799 |
|
|
PE_Overlaid_Controlled_Object, -- 25
|
800 |
|
|
PE_Potentially_Blocking_Operation, -- 26
|
801 |
|
|
PE_Stubbed_Subprogram_Called, -- 27
|
802 |
|
|
PE_Unchecked_Union_Restriction, -- 28
|
803 |
|
|
PE_Non_Transportable_Actual, -- 29
|
804 |
|
|
|
805 |
|
|
SE_Empty_Storage_Pool, -- 30
|
806 |
|
|
SE_Explicit_Raise, -- 31
|
807 |
|
|
SE_Infinite_Recursion, -- 32
|
808 |
|
|
SE_Object_Too_Large); -- 33
|
809 |
|
|
|
810 |
|
|
subtype RT_CE_Exceptions is RT_Exception_Code range
|
811 |
|
|
CE_Access_Check_Failed ..
|
812 |
|
|
CE_Tag_Check_Failed;
|
813 |
|
|
|
814 |
|
|
subtype RT_PE_Exceptions is RT_Exception_Code range
|
815 |
|
|
PE_Access_Before_Elaboration ..
|
816 |
|
|
PE_Non_Transportable_Actual;
|
817 |
|
|
|
818 |
|
|
subtype RT_SE_Exceptions is RT_Exception_Code range
|
819 |
|
|
SE_Empty_Storage_Pool ..
|
820 |
|
|
SE_Object_Too_Large;
|
821 |
|
|
|
822 |
|
|
end Types;
|