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1018 lines
45 KiB
Ada
1018 lines
45 KiB
Ada
------------------------------------------------------------------------------
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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) 1992-2022, 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. 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 COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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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
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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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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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subtype Nonzero_Int is Int with Predicate => Nonzero_Int /= 0;
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type Int_64 is range -2 ** 63 .. +2 ** 63 - 1;
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-- Signed 64-bit integer
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subtype Nat_64 is Int_64 range 0 .. Int_64'Last;
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subtype Pos_64 is Int_64 range 1 .. Int_64'Last;
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subtype Nonzero_Int_64 is Int_64 with Predicate => Nonzero_Int_64 /= 0;
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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). For further details, see
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-- the extensive discussion of line termination in the Sinput spec.
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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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-- 8-bit 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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type String_Ptr_Const is access constant 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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-- Virtual type for handling imported big strings. Note that we should
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-- never have any allocators for this type, but we don't give a storage
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-- size of zero, since there are legitimate deallocations going on.
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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 cannot 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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Source_Align : constant := 2 ** 12;
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-- Alignment requirement for source buffers (by keeping source buffers
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-- aligned, we can optimize the implementation of Get_Source_File_Index.
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-- See this routine in Sinput for details.
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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, rounded up to
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-- a multiple of Source_Align.
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type Source_Buffer_Ptr_Var is access all Source_Buffer;
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type Source_Buffer_Ptr is access constant Source_Buffer;
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-- Pointer to source buffer. Source_Buffer_Ptr_Var is used for allocation
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-- and deallocation; Source_Buffer_Ptr is used for all other uses of source
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-- buffers.
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function Null_Source_Buffer_Ptr (X : Source_Buffer_Ptr) return Boolean;
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-- True if X = null
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function Source_Buffer_Ptr_Equal (X, Y : Source_Buffer_Ptr) return Boolean
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renames "=";
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-- Squirrel away the predefined "=", for use in Null_Source_Buffer_Ptr.
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-- Do not call this elsewhere.
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function "=" (X, Y : Source_Buffer_Ptr) return Boolean is abstract;
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-- Make "=" abstract. Note that this makes "/=" abstract as well. This is a
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-- vestige of the zero-origin array indexing we used to use, where "=" is
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-- always wrong (including the one in Null_Source_Buffer_Ptr). We keep this
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-- just because we never need to compare Source_Buffer_Ptrs other than to
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-- null.
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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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type Source_Span is record
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Ptr, First, Last : Source_Ptr;
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end record;
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-- Type used to represent a source span, consisting in a main location Ptr,
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-- with a First and Last location, such that Ptr in First .. Last
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function To_Span (Loc : Source_Ptr) return Source_Span is ((others => Loc));
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function To_Span (Ptr, First, Last : Source_Ptr) return Source_Span is
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((Ptr, First, Last));
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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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-- These types are represented as integer indices into various tables.
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-- However, they should be treated as private, except in a few documented
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-- cases. In particular it is usually inappropriate to perform arithmetic
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-- operations using these types. One exception is in computing hash
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-- functions of these types.
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-- In most contexts, the strongly typed interface determines which of these
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-- types is present. However, there are some situations (involving untyped
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-- traversals of the tree), where it is convenient to be easily able to
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-- distinguish these values. The underlying representation in all cases is
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-- an integer type Union_Id, and we ensure that the range of the various
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-- possible values for each of the above types is disjoint (except that
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-- List_Id and Node_Id overlap at Empty) so that this distinction is
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-- possible.
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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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-- The range of Node_Id is most of the nonnegative integers. The other
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-- ranges are negative. Uint has a very large range, because a substantial
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-- part of this range is used to store direct values; see Uintp for
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-- details. The other types have 100 million values, which should be
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-- plenty.
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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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-- Following are the Low and High bounds of the various ranges.
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List_Low_Bound : constant := -099_999_999;
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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.
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List_High_Bound : constant := 0;
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-- Maximum List_Id subscript value. The ranges of List_Id and Node_Id
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-- overlap by one element (with value zero), which is used both for the
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-- Empty node, and for No_List. The fact that the same value is used is
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-- convenient because it means that the default value of Empty applies to
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-- both nodes and lists, 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).
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Node_High_Bound : constant := 1_999_999_999;
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Elist_Low_Bound : constant := -199_999_999;
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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 := -100_000_000;
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Elmt_Low_Bound : constant := -299_999_999;
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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 := -200_000_000;
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Names_Low_Bound : constant := -399_999_999;
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Names_High_Bound : constant := -300_000_000;
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Strings_Low_Bound : constant := -499_999_999;
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Strings_High_Bound : constant := -400_000_000;
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Ureal_Low_Bound : constant := -599_999_999;
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Ureal_High_Bound : constant := -500_000_000;
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Uint_Low_Bound : constant := -2_100_000_000;
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-- Low bound for Uint values
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Uint_Table_Start : constant := -699_999_999;
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-- Location where table entries for universal integers start (see
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-- Uintp spec for details of the representation of Uint values).
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Uint_High_Bound : constant := -600_000_000;
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-- The following subtype definitions are used to provide convenient names
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-- for membership tests on Int values to see what data type range they
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-- lie in. Such tests appear only in the lowest level packages.
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subtype List_Range is Union_Id
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range List_Low_Bound .. List_High_Bound;
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subtype Node_Range is Union_Id
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range Node_Low_Bound .. Node_High_Bound;
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subtype Elist_Range is Union_Id
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range Elist_Low_Bound .. Elist_High_Bound;
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subtype Elmt_Range is Union_Id
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range Elmt_Low_Bound .. Elmt_High_Bound;
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subtype Names_Range is Union_Id
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range Names_Low_Bound .. Names_High_Bound;
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subtype Strings_Range is Union_Id
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range Strings_Low_Bound .. Strings_High_Bound;
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subtype Uint_Range is Union_Id
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range Uint_Low_Bound .. Uint_High_Bound;
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subtype Ureal_Range is Union_Id
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range Ureal_Low_Bound .. Ureal_High_Bound;
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-----------------------------
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-- Types for Atree Package --
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-----------------------------
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-- Node_Id values are used to identify nodes in the tree. They are
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-- subscripts into the Nodes table declared in package Atree. Note that
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-- the special values Empty and Error are subscripts into this table.
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-- See package Atree for further details.
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type Node_Id is range Node_Low_Bound .. Node_High_Bound with Size => 32;
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-- Type used to identify nodes in the tree
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subtype Entity_Id is Node_Id;
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-- A synonym for node types, used in the Einfo package to refer to nodes
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-- that are entities (i.e. nodes with an Nkind of N_Defining_xxx). All such
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-- nodes are extended nodes and these are the only extended nodes, so that
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-- in practice entity and extended nodes are synonymous.
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subtype Node_Or_Entity_Id is Node_Id;
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-- A synonym for node types, used in cases where a given value may be used
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-- to represent either a node or an entity. We like to minimize such uses
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-- for obvious reasons of logical type consistency, but where such uses
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-- occur, they should be documented by use of this type.
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Empty : constant Node_Id := Node_Low_Bound;
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-- Used to indicate null node. A node is actually allocated with this
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-- Id value, so that Nkind (Empty) = N_Empty. Note that Node_Low_Bound
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-- is zero, so Empty = No_List = zero.
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Empty_List_Or_Node : constant := 0;
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-- This constant is used in situations (e.g. initializing empty fields)
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-- where the value set will be used to represent either an empty node or
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-- a non-existent list, depending on the context.
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Error : constant Node_Id := Node_Low_Bound + 1;
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-- Used to indicate an error in the source program. A node is actually
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-- allocated with this Id value, so that Nkind (Error) = N_Error.
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Empty_Or_Error : constant Node_Id := Error;
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-- Since Empty and Error are the first two Node_Id values, the test for
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-- N <= Empty_Or_Error tests to see if N is Empty or Error. This definition
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-- provides convenient self-documentation for such tests.
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First_Node_Id : constant Node_Id := Node_Low_Bound;
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-- Subscript of first allocated node. Note that Empty and Error are both
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-- allocated nodes, whose Nkind fields can be accessed without error.
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------------------------------
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-- Types for Nlists Package --
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------------------------------
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-- List_Id values are used to identify node lists stored in the tree, so
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-- that each node can be on at most one such list (see package Nlists for
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-- further details). Note that the special value Error_List is a subscript
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-- in this table, but the value No_List is *not* a valid subscript, and any
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-- attempt to apply list operations to No_List will cause a (detected)
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-- error.
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type List_Id is range List_Low_Bound .. List_High_Bound with Size => 32;
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-- Type used to identify a node list
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No_List : constant List_Id := List_High_Bound;
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-- Used to indicate absence of a list. Note that the value is zero, which
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-- is the same as Empty, which is helpful in initializing nodes where a
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-- value of zero can represent either an empty node or an empty list.
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Error_List : constant List_Id := List_Low_Bound;
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-- Used to indicate that there was an error in the source program in a
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-- context which would normally require a list. This node appears to be
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-- an empty list to the list operations (a null list is actually allocated
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-- which has this Id value).
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First_List_Id : constant List_Id := Error_List;
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-- Subscript of first allocated list header
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------------------------------
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-- Types for Elists Package --
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------------------------------
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-- Element list Id values are used to identify element lists stored outside
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-- of the tree, allowing nodes to be members of more than one such list
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-- (see package Elists for further details).
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type Elist_Id is range Elist_Low_Bound .. Elist_High_Bound with Size => 32;
|
|
-- Type used to identify an element list (Elist header table subscript)
|
|
|
|
No_Elist : constant Elist_Id := Elist_Low_Bound;
|
|
-- Used to indicate absence of an element list. Note that this is not an
|
|
-- actual Elist header, so element list operations on this value are not
|
|
-- valid.
|
|
|
|
First_Elist_Id : constant Elist_Id := No_Elist + 1;
|
|
-- Subscript of first allocated Elist header
|
|
|
|
-- Element Id values are used to identify individual elements of an element
|
|
-- list (see package Elists for further details).
|
|
|
|
type Elmt_Id is range Elmt_Low_Bound .. Elmt_High_Bound;
|
|
-- Type used to identify an element list
|
|
|
|
No_Elmt : constant Elmt_Id := Elmt_Low_Bound;
|
|
-- Used to represent empty element
|
|
|
|
First_Elmt_Id : constant Elmt_Id := No_Elmt + 1;
|
|
-- Subscript of first allocated Elmt table entry
|
|
|
|
-------------------------------
|
|
-- Types for Stringt Package --
|
|
-------------------------------
|
|
|
|
-- String_Id values are used to identify entries in the strings table. They
|
|
-- are subscripts into the Strings table defined in package Stringt.
|
|
|
|
type String_Id is range Strings_Low_Bound .. Strings_High_Bound
|
|
with Size => 32;
|
|
-- Type used to identify entries in the strings table
|
|
|
|
No_String : constant String_Id := Strings_Low_Bound;
|
|
-- Used to indicate missing string Id. Note that the value zero is used
|
|
-- to indicate a missing data value for all the Int types in this section.
|
|
|
|
First_String_Id : constant String_Id := No_String + 1;
|
|
-- First subscript allocated in string table
|
|
|
|
-------------------------
|
|
-- Character Code Type --
|
|
-------------------------
|
|
|
|
-- The type Char is used for character data internally in the compiler, but
|
|
-- character codes in the source are represented by the Char_Code type.
|
|
-- Each character literal in the source is interpreted as being one of the
|
|
-- 16#7FFF_FFFF# possible Wide_Wide_Character codes, and a unique Integer
|
|
-- value is assigned, corresponding to the UTF-32 value, which also
|
|
-- corresponds to the Pos value in the Wide_Wide_Character type, and also
|
|
-- corresponds to the Pos value in the Wide_Character and Character types
|
|
-- for values that are in appropriate range. String literals are similarly
|
|
-- interpreted as a sequence of such codes.
|
|
|
|
type Char_Code_Base is mod 2 ** 32;
|
|
for Char_Code_Base'Size use 32;
|
|
|
|
subtype Char_Code is Char_Code_Base range 0 .. 16#7FFF_FFFF#;
|
|
for Char_Code'Value_Size use 32;
|
|
for Char_Code'Object_Size use 32;
|
|
|
|
function Get_Char_Code (C : Character) return Char_Code;
|
|
pragma Inline (Get_Char_Code);
|
|
-- Function to obtain internal character code from source character. For
|
|
-- the moment, the internal character code is simply the Pos value of the
|
|
-- input source character, but we provide this interface for possible
|
|
-- later support of alternative character sets.
|
|
|
|
function In_Character_Range (C : Char_Code) return Boolean;
|
|
pragma Inline (In_Character_Range);
|
|
-- Determines if the given character code is in range of type Character,
|
|
-- and if so, returns True. If not, returns False.
|
|
|
|
function In_Wide_Character_Range (C : Char_Code) return Boolean;
|
|
pragma Inline (In_Wide_Character_Range);
|
|
-- Determines if the given character code is in range of the type
|
|
-- Wide_Character, and if so, returns True. If not, returns False.
|
|
|
|
function Get_Character (C : Char_Code) return Character;
|
|
pragma Inline (Get_Character);
|
|
-- For a character C that is in Character range (see above function), this
|
|
-- function returns the corresponding Character value. It is an error to
|
|
-- call Get_Character if C is not in Character range.
|
|
|
|
function Get_Wide_Character (C : Char_Code) return Wide_Character;
|
|
-- For a character C that is in Wide_Character range (see above function),
|
|
-- this function returns the corresponding Wide_Character value. It is an
|
|
-- error to call Get_Wide_Character if C is not in Wide_Character range.
|
|
|
|
---------------------------------------
|
|
-- Types used for Library Management --
|
|
---------------------------------------
|
|
|
|
type Unit_Number_Type is new Int range -1 .. Int'Last;
|
|
-- Unit number. The main source is unit 0, and subsidiary sources have
|
|
-- non-zero numbers starting with 1. Unit numbers are used to index the
|
|
-- Units table in package Lib.
|
|
|
|
Main_Unit : constant Unit_Number_Type := 0;
|
|
-- Unit number value for main unit
|
|
|
|
No_Unit : constant Unit_Number_Type := -1;
|
|
-- Special value used to signal no unit
|
|
|
|
type Source_File_Index is new Int range -1 .. Int'Last;
|
|
-- Type used to index the source file table (see package Sinput)
|
|
|
|
No_Source_File : constant Source_File_Index := 0;
|
|
-- Value used to indicate no source file present
|
|
|
|
No_Access_To_Source_File : constant Source_File_Index := -1;
|
|
-- Value used to indicate a source file is present but unreadable
|
|
|
|
-----------------------------------
|
|
-- Representation of Time Stamps --
|
|
-----------------------------------
|
|
|
|
-- All compiled units are marked with a time stamp which is derived from
|
|
-- the source file (we assume that the host system has the concept of a
|
|
-- file time stamp which is modified when a file is modified). These
|
|
-- time stamps are used to ensure consistency of the set of units that
|
|
-- constitutes a library. Time stamps are 14-character strings with
|
|
-- with the following format:
|
|
|
|
-- YYYYMMDDHHMMSS
|
|
|
|
-- YYYY year
|
|
-- MM month (2 digits 01-12)
|
|
-- DD day (2 digits 01-31)
|
|
-- HH hour (2 digits 00-23)
|
|
-- MM minutes (2 digits 00-59)
|
|
-- SS seconds (2 digits 00-59)
|
|
|
|
-- In the case of Unix systems (and other systems which keep the time in
|
|
-- GMT), the time stamp is the GMT time of the file, not the local time.
|
|
-- This solves problems in using libraries across networks with clients
|
|
-- spread across multiple time-zones.
|
|
|
|
Time_Stamp_Length : constant := 14;
|
|
-- Length of time stamp value
|
|
|
|
subtype Time_Stamp_Index is Natural range 1 .. Time_Stamp_Length;
|
|
type Time_Stamp_Type is new String (Time_Stamp_Index);
|
|
-- Type used to represent time stamp
|
|
|
|
Empty_Time_Stamp : constant Time_Stamp_Type := (others => ' ');
|
|
-- Value representing an empty or missing time stamp. Looks less than any
|
|
-- real time stamp if two time stamps are compared. Note that although this
|
|
-- is not private, clients should not rely on the exact way in which this
|
|
-- string is represented, and instead should use the subprograms below.
|
|
|
|
Dummy_Time_Stamp : constant Time_Stamp_Type := (others => '0');
|
|
-- This is used for dummy time stamp values used in the D lines for
|
|
-- non-existent files, and is intended to be an impossible value.
|
|
|
|
function "=" (Left, Right : Time_Stamp_Type) return Boolean;
|
|
function "<=" (Left, Right : Time_Stamp_Type) return Boolean;
|
|
function ">=" (Left, Right : Time_Stamp_Type) return Boolean;
|
|
function "<" (Left, Right : Time_Stamp_Type) return Boolean;
|
|
function ">" (Left, Right : Time_Stamp_Type) return Boolean;
|
|
-- Comparison functions on time stamps. Note that two time stamps are
|
|
-- defined as being equal if they have the same day/month/year and the
|
|
-- hour/minutes/seconds values are within 2 seconds of one another. This
|
|
-- deals with rounding effects in library file time stamps caused by
|
|
-- copying operations during installation. We have particularly noticed
|
|
-- that WinNT seems susceptible to such changes.
|
|
--
|
|
-- Note: the Empty_Time_Stamp value looks equal to itself, and less than
|
|
-- any non-empty time stamp value.
|
|
|
|
procedure Split_Time_Stamp
|
|
(TS : Time_Stamp_Type;
|
|
Year : out Nat;
|
|
Month : out Nat;
|
|
Day : out Nat;
|
|
Hour : out Nat;
|
|
Minutes : out Nat;
|
|
Seconds : out Nat);
|
|
-- Given a time stamp, decompose it into its components
|
|
|
|
procedure Make_Time_Stamp
|
|
(Year : Nat;
|
|
Month : Nat;
|
|
Day : Nat;
|
|
Hour : Nat;
|
|
Minutes : Nat;
|
|
Seconds : Nat;
|
|
TS : out Time_Stamp_Type);
|
|
-- Given the components of a time stamp, initialize the value
|
|
|
|
-------------------------------------
|
|
-- Types used for Check Management --
|
|
-------------------------------------
|
|
|
|
type Check_Id is new Nat;
|
|
-- Type used to represent a check id
|
|
|
|
No_Check_Id : constant := 0;
|
|
-- Check_Id value used to indicate no check
|
|
|
|
Access_Check : constant := 1;
|
|
Accessibility_Check : constant := 2;
|
|
Alignment_Check : constant := 3;
|
|
Allocation_Check : constant := 4;
|
|
Atomic_Synchronization : constant := 5;
|
|
Characters_Assertion_Check : constant := 6;
|
|
Containers_Assertion_Check : constant := 7;
|
|
Discriminant_Check : constant := 8;
|
|
Division_Check : constant := 9;
|
|
Duplicated_Tag_Check : constant := 10;
|
|
Elaboration_Check : constant := 11;
|
|
Index_Check : constant := 12;
|
|
Interfaces_Assertion_Check : constant := 13;
|
|
IO_Assertion_Check : constant := 14;
|
|
Length_Check : constant := 15;
|
|
Numerics_Assertion_Check : constant := 16;
|
|
Overflow_Check : constant := 17;
|
|
Predicate_Check : constant := 18;
|
|
Program_Error_Check : constant := 19;
|
|
Range_Check : constant := 20;
|
|
Storage_Check : constant := 21;
|
|
Strings_Assertion_Check : constant := 22;
|
|
System_Assertion_Check : constant := 23;
|
|
Tag_Check : constant := 24;
|
|
Validity_Check : constant := 25;
|
|
Container_Checks : constant := 26;
|
|
Tampering_Check : constant := 27;
|
|
Tasking_Check : constant := 28;
|
|
-- Values used to represent individual predefined checks (including the
|
|
-- setting of Atomic_Synchronization, which is implemented internally using
|
|
-- a "check" whose name is Atomic_Synchronization).
|
|
|
|
All_Checks : constant := 29;
|
|
-- Value used to represent All_Checks value
|
|
|
|
subtype Predefined_Check_Id is Check_Id range 1 .. All_Checks;
|
|
-- Subtype for predefined checks, including All_Checks
|
|
|
|
-- The following array contains an entry for each recognized check name
|
|
-- for pragma Suppress. It is used to represent current settings of scope
|
|
-- based suppress actions from pragma Suppress or command line settings.
|
|
|
|
-- Note: when Suppress_Array (All_Checks) is True, then generally all other
|
|
-- specific check entries are set True, except for the Elaboration_Check
|
|
-- entry which is set only if an explicit Suppress for this check is given.
|
|
-- The reason for this non-uniformity is that we do not want All_Checks to
|
|
-- suppress elaboration checking when using the static elaboration model.
|
|
-- We recognize only an explicit suppress of Elaboration_Check as a signal
|
|
-- that the static elaboration checking should skip a compile time check.
|
|
|
|
type Suppress_Array is array (Predefined_Check_Id) of Boolean;
|
|
pragma Pack (Suppress_Array);
|
|
|
|
-- To add a new check type to GNAT, the following steps are required:
|
|
|
|
-- 1. Add an entry to Snames spec for the new name
|
|
-- 2. Add an entry to the definition of Check_Id above (very important:
|
|
-- these definitions should be in the same order in Snames and here)
|
|
-- 3. Add a new function to Checks to handle the new check test
|
|
-- 4. Add a new Do_xxx_Check flag to Sinfo (if required)
|
|
-- 5. Add appropriate checks for the new test
|
|
|
|
-- The following provides precise details on the mode used to generate
|
|
-- code for intermediate operations in expressions for signed integer
|
|
-- arithmetic (and how to generate overflow checks if enabled). Note
|
|
-- that this only affects handling of intermediate results. The final
|
|
-- result must always fit within the target range, and if overflow
|
|
-- checking is enabled, the check on the final result is against this
|
|
-- target range.
|
|
|
|
type Overflow_Mode_Type is (
|
|
Not_Set,
|
|
-- Dummy value used during initialization process to show that the
|
|
-- corresponding value has not yet been initialized.
|
|
|
|
Strict,
|
|
-- Operations are done in the base type of the subexpression. If
|
|
-- overflow checks are enabled, then the check is against the range
|
|
-- of this base type.
|
|
|
|
Minimized,
|
|
-- Where appropriate, intermediate arithmetic operations are performed
|
|
-- with an extended range, using Long_Long_Integer if necessary. If
|
|
-- overflow checking is enabled, then the check is against the range
|
|
-- of Long_Long_Integer.
|
|
|
|
Eliminated);
|
|
-- In this mode arbitrary precision arithmetic is used as needed to
|
|
-- ensure that it is impossible for intermediate arithmetic to cause an
|
|
-- overflow. In this mode, intermediate expressions are not affected by
|
|
-- the overflow checking mode, since overflows are eliminated.
|
|
|
|
subtype Minimized_Or_Eliminated is
|
|
Overflow_Mode_Type range Minimized .. Eliminated;
|
|
-- Define subtype so that clients don't need to know ordering. Note that
|
|
-- Overflow_Mode_Type is not marked as an ordered enumeration type.
|
|
|
|
-- The following structure captures the state of check suppression or
|
|
-- activation at a particular point in the program execution.
|
|
|
|
type Suppress_Record is record
|
|
Suppress : Suppress_Array;
|
|
-- Indicates suppression status of each possible check
|
|
|
|
Overflow_Mode_General : Overflow_Mode_Type;
|
|
-- This field indicates the mode for handling code generation and
|
|
-- overflow checking (if enabled) for intermediate expression values.
|
|
-- This applies to general expressions outside assertions.
|
|
|
|
Overflow_Mode_Assertions : Overflow_Mode_Type;
|
|
-- This field indicates the mode for handling code generation and
|
|
-- overflow checking (if enabled) for intermediate expression values.
|
|
-- This applies to any expression occurring inside assertions.
|
|
end record;
|
|
|
|
-----------------------------------
|
|
-- Global Exception Declarations --
|
|
-----------------------------------
|
|
|
|
-- This section contains declarations of exceptions that are used
|
|
-- throughout the compiler or in other GNAT tools.
|
|
|
|
Unrecoverable_Error : exception;
|
|
-- This exception is raised to immediately terminate the compilation of the
|
|
-- current source program. Used in situations where things are bad enough
|
|
-- that it doesn't seem worth continuing (e.g. max errors reached, or a
|
|
-- required file is not found). Also raised when the compiler finds itself
|
|
-- in trouble after an error (see Comperr).
|
|
|
|
Terminate_Program : exception;
|
|
-- This exception is raised to immediately terminate the tool being
|
|
-- executed. Each tool where this exception may be raised must have a
|
|
-- single exception handler that contains only a null statement and that is
|
|
-- the last statement of the program. If needed, procedure Set_Exit_Status
|
|
-- is called with the appropriate exit status before raising
|
|
-- Terminate_Program.
|
|
|
|
---------------------------------
|
|
-- Parameter Mechanism Control --
|
|
---------------------------------
|
|
|
|
-- Function and parameter entities have a field that records the passing
|
|
-- mechanism. See specification of Sem_Mech for full details. The following
|
|
-- subtype is used to represent values of this type:
|
|
|
|
subtype Mechanism_Type is Int range -2 .. Int'Last;
|
|
-- Type used to represent a mechanism value. This is a subtype rather than
|
|
-- a type to avoid some annoying processing problems with certain routines
|
|
-- in Einfo (processing them to create the corresponding C). The values in
|
|
-- the range -2 .. 0 are used to represent mechanism types declared as
|
|
-- named constants in the spec of Sem_Mech. Positive values are used for
|
|
-- the case of a pragma C_Pass_By_Copy that sets a threshold value for the
|
|
-- mechanism to be used. For example if pragma C_Pass_By_Copy (32) is given
|
|
-- then Default_C_Record_Mechanism is set to 32, and the meaning is to use
|
|
-- By_Reference if the size is greater than 32, and By_Copy otherwise.
|
|
|
|
---------------------------------
|
|
-- Component_Alignment Control --
|
|
---------------------------------
|
|
|
|
-- There are four types of alignment possible for array and record
|
|
-- types, and a field in the type entities contains a value of the
|
|
-- following type indicating which alignment choice applies. For full
|
|
-- details of the meaning of these alignment types, see description
|
|
-- of the Component_Alignment pragma.
|
|
|
|
type Component_Alignment_Kind is (
|
|
Calign_Default, -- default alignment
|
|
Calign_Component_Size, -- natural alignment for component size
|
|
Calign_Component_Size_4, -- natural for size <= 4, 4 for size >= 4
|
|
Calign_Storage_Unit); -- all components byte aligned
|
|
|
|
-----------------------------------
|
|
-- Floating Point Representation --
|
|
-----------------------------------
|
|
|
|
type Float_Rep_Kind is (IEEE_Binary);
|
|
-- The only one supported now is IEEE 754p conforming binary format, but
|
|
-- other formats were supported in the past, and could conceivably be
|
|
-- supported in the future, so we keep this singleton enumeration type.
|
|
|
|
----------------------------
|
|
-- Small_Paren_Count_Type --
|
|
----------------------------
|
|
|
|
-- See Paren_Count in Atree for documentation
|
|
|
|
subtype Small_Paren_Count_Type is Nat range 0 .. 3;
|
|
|
|
------------------------------
|
|
-- Run-Time Exception Codes --
|
|
------------------------------
|
|
|
|
-- When the code generator generates a run-time exception, it provides a
|
|
-- reason code which is one of the following. This reason code is used to
|
|
-- select the appropriate run-time routine to be called, determining both
|
|
-- the exception to be raised, and the message text to be added.
|
|
|
|
-- The prefix CE/PE/SE indicates the exception to be raised
|
|
-- CE = Constraint_Error
|
|
-- PE = Program_Error
|
|
-- SE = Storage_Error
|
|
|
|
-- The remaining part of the name indicates the message text to be added,
|
|
-- where all letters are lower case, and underscores are converted to
|
|
-- spaces (for example CE_Invalid_Data adds the text "invalid data").
|
|
|
|
-- To add a new code, you need to do the following:
|
|
|
|
-- 1. Assign a new number to the reason. Do not renumber existing codes,
|
|
-- since this causes compatibility/bootstrap issues, so always add the
|
|
-- new code at the end of the list.
|
|
|
|
-- 2. Update the contents of the array Kind
|
|
|
|
-- 3. Modify the corresponding definitions in types.h, including the
|
|
-- definition of last_reason_code.
|
|
|
|
-- 4. Add the name of the routines in exp_ch11.Get_RT_Exception_Name
|
|
|
|
-- 5. Add a new routine in Ada.Exceptions with the appropriate call and
|
|
-- static string constant. Note that there is more than one version
|
|
-- of a-except.adb which must be modified.
|
|
|
|
-- Note on ordering of references. For the tables in Ada.Exceptions units,
|
|
-- usually the ordering does not matter, and we use the same ordering as
|
|
-- is used here.
|
|
|
|
type RT_Exception_Code is
|
|
(CE_Access_Check_Failed, -- 00
|
|
CE_Access_Parameter_Is_Null, -- 01
|
|
CE_Discriminant_Check_Failed, -- 02
|
|
CE_Divide_By_Zero, -- 03
|
|
CE_Explicit_Raise, -- 04
|
|
CE_Index_Check_Failed, -- 05
|
|
CE_Invalid_Data, -- 06
|
|
CE_Length_Check_Failed, -- 07
|
|
CE_Null_Exception_Id, -- 08
|
|
CE_Null_Not_Allowed, -- 09
|
|
|
|
CE_Overflow_Check_Failed, -- 10
|
|
CE_Partition_Check_Failed, -- 11
|
|
CE_Range_Check_Failed, -- 12
|
|
CE_Tag_Check_Failed, -- 13
|
|
PE_Access_Before_Elaboration, -- 14
|
|
PE_Accessibility_Check_Failed, -- 15
|
|
PE_Address_Of_Intrinsic, -- 16
|
|
PE_Aliased_Parameters, -- 17
|
|
PE_All_Guards_Closed, -- 18
|
|
PE_Bad_Predicated_Generic_Type, -- 19
|
|
|
|
PE_Current_Task_In_Entry_Body, -- 20
|
|
PE_Duplicated_Entry_Address, -- 21
|
|
PE_Explicit_Raise, -- 22
|
|
PE_Finalize_Raised_Exception, -- 23
|
|
PE_Implicit_Return, -- 24
|
|
PE_Misaligned_Address_Value, -- 25
|
|
PE_Missing_Return, -- 26
|
|
PE_Overlaid_Controlled_Object, -- 27
|
|
PE_Potentially_Blocking_Operation, -- 28
|
|
PE_Stubbed_Subprogram_Called, -- 29
|
|
|
|
PE_Unchecked_Union_Restriction, -- 30
|
|
PE_Non_Transportable_Actual, -- 31
|
|
SE_Empty_Storage_Pool, -- 32
|
|
SE_Explicit_Raise, -- 33
|
|
SE_Infinite_Recursion, -- 34
|
|
SE_Object_Too_Large, -- 35
|
|
PE_Stream_Operation_Not_Allowed, -- 36
|
|
PE_Build_In_Place_Mismatch); -- 37
|
|
pragma Convention (C, RT_Exception_Code);
|
|
|
|
Last_Reason_Code : constant :=
|
|
RT_Exception_Code'Pos (RT_Exception_Code'Last);
|
|
-- Last reason code
|
|
|
|
type Reason_Kind is (CE_Reason, PE_Reason, SE_Reason);
|
|
-- Categorization of reason codes by exception raised
|
|
|
|
Rkind : constant array (RT_Exception_Code range <>) of Reason_Kind :=
|
|
(CE_Access_Check_Failed => CE_Reason,
|
|
CE_Access_Parameter_Is_Null => CE_Reason,
|
|
CE_Discriminant_Check_Failed => CE_Reason,
|
|
CE_Divide_By_Zero => CE_Reason,
|
|
CE_Explicit_Raise => CE_Reason,
|
|
CE_Index_Check_Failed => CE_Reason,
|
|
CE_Invalid_Data => CE_Reason,
|
|
CE_Length_Check_Failed => CE_Reason,
|
|
CE_Null_Exception_Id => CE_Reason,
|
|
CE_Null_Not_Allowed => CE_Reason,
|
|
CE_Overflow_Check_Failed => CE_Reason,
|
|
CE_Partition_Check_Failed => CE_Reason,
|
|
CE_Range_Check_Failed => CE_Reason,
|
|
CE_Tag_Check_Failed => CE_Reason,
|
|
|
|
PE_Access_Before_Elaboration => PE_Reason,
|
|
PE_Accessibility_Check_Failed => PE_Reason,
|
|
PE_Address_Of_Intrinsic => PE_Reason,
|
|
PE_Aliased_Parameters => PE_Reason,
|
|
PE_All_Guards_Closed => PE_Reason,
|
|
PE_Bad_Predicated_Generic_Type => PE_Reason,
|
|
PE_Current_Task_In_Entry_Body => PE_Reason,
|
|
PE_Duplicated_Entry_Address => PE_Reason,
|
|
PE_Explicit_Raise => PE_Reason,
|
|
PE_Finalize_Raised_Exception => PE_Reason,
|
|
PE_Implicit_Return => PE_Reason,
|
|
PE_Misaligned_Address_Value => PE_Reason,
|
|
PE_Missing_Return => PE_Reason,
|
|
PE_Overlaid_Controlled_Object => PE_Reason,
|
|
PE_Potentially_Blocking_Operation => PE_Reason,
|
|
PE_Stubbed_Subprogram_Called => PE_Reason,
|
|
PE_Unchecked_Union_Restriction => PE_Reason,
|
|
PE_Non_Transportable_Actual => PE_Reason,
|
|
PE_Stream_Operation_Not_Allowed => PE_Reason,
|
|
PE_Build_In_Place_Mismatch => PE_Reason,
|
|
|
|
SE_Empty_Storage_Pool => SE_Reason,
|
|
SE_Explicit_Raise => SE_Reason,
|
|
SE_Infinite_Recursion => SE_Reason,
|
|
SE_Object_Too_Large => SE_Reason);
|
|
|
|
-- Types for field offsets/sizes used in Seinfo, Sinfo.Nodes and
|
|
-- Einfo.Entities:
|
|
|
|
type Field_Offset is new Nat;
|
|
-- Offset of a node field, in units of the size of the field, which is
|
|
-- always a power of 2.
|
|
|
|
subtype Node_Offset is Field_Offset'Base range 1 .. Field_Offset'Base'Last;
|
|
|
|
subtype Slot_Count is Field_Offset;
|
|
-- Count of number of slots. Same type as Field_Offset to avoid
|
|
-- proliferation of type conversions.
|
|
|
|
subtype Field_Size_In_Bits is Field_Offset with Predicate =>
|
|
Field_Size_In_Bits in 1 | 2 | 4 | 8 | 32;
|
|
|
|
subtype Opt_Field_Offset is Field_Offset'Base range -1 .. Field_Offset'Last;
|
|
No_Field_Offset : constant Opt_Field_Offset := Opt_Field_Offset'First;
|
|
|
|
type Offset_Array_Index is new Nat;
|
|
type Offset_Array is
|
|
array (Offset_Array_Index range <>) of Opt_Field_Offset;
|
|
|
|
end Types;
|