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-- Common types.
-- Copyright (C) 2002 - 2015 Tristan Gingold
--
-- GHDL is free software; you can redistribute it and/or modify it under
-- the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version.
--
-- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with GHDL; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Interfaces;
package Types is
pragma Preelaborate (Types);
-- A tri state type.
type Tri_State_Type is (Unknown, False, True);
-- 32 bits integer.
type Int32 is range -2**31 .. 2**31 - 1;
for Int32'Size use 32;
subtype Nat32 is Int32 range 0 .. Int32'Last;
subtype Pos32 is Nat32 range 1 .. Nat32'Last;
subtype Nat8 is Nat32 range 0 .. 255;
type Uns32 is new Interfaces.Unsigned_32;
type Fp64 is new Interfaces.IEEE_Float_64;
-- iir_int32 is aimed at containing integer literal values.
type Iir_Int32 is new Interfaces.Integer_32;
-- iir_int64 is aimed at containing units values.
type Iir_Int64 is new Interfaces.Integer_64;
-- iir_fp64 is aimed at containing floating point values.
subtype Iir_Fp64 is Fp64;
-- iir_index32 is aimed at containing an array index.
type Iir_Index32 is new Nat32;
-- Useful types.
type String_Acc is access String;
type String_Cst is access constant String;
type String_Acc_Array is array (Natural range <>) of String_Acc;
-- The name table is defined in Name_Table package. This is an hash table
-- that associate a uniq Name_Id to a string. Name_Id are allocated in
-- increasing numbers, so it is possible to create a parallel table
-- indexed on Name_Id to associate additional data to the names.
type Name_Id is new Nat32;
-- Null entry in the name table.
-- It is sure that this entry is never allocated.
Null_Identifier: constant Name_Id := 0;
-- A String8_Id represents a string stored in a dedicated table. Contrary
-- to Name_Id, String8 aren't uniq: two different String8_Id can correspond
-- to a same String. The purpose of an integer number for string is to
-- have a 32 bit type to represent a string (contrary to pointers that
-- could be 32 or 64 bit - in general - or to an access type which can be
-- even wider in Ada).
type String8_Id is new Nat32;
for String8_Id'Size use 32;
Null_String8 : constant String8_Id := 0;
-- Index type is the source file table.
-- This table is defined in the files_map package.
type Source_File_Entry is new Nat32;
No_Source_File_Entry: constant Source_File_Entry := 0;
-- FIXME: additional source file entries to create:
-- *std.standard*: for those created in std.standard
-- *error*: for erroneous one
-- *command-line*: used for identifiers from command line
-- (eg: unit to elab)
-- Index into a file buffer.
type Source_Ptr is new Uns32;
-- Valid bounds of any file buffer.
Source_Ptr_Org : constant Source_Ptr := 0;
Source_Ptr_Last : constant Source_Ptr := Source_Ptr'Last - 1;
-- Bad file buffer index (used to mark no line).
Source_Ptr_Bad : constant Source_Ptr := Source_Ptr'Last;
-- Type of a file buffer.
type File_Buffer is array (Source_Ptr range <>) of Character;
type File_Buffer_Acc is access File_Buffer;
-- This type contains everything necessary to get a file name, a line
-- number and a column number.
type Location_Type is new Uns32;
for Location_Type'Size use 32;
Location_Nil : constant Location_Type := 0;
No_Location : constant Location_Type := 0;
-- PSL Node.
type PSL_Node is new Int32;
-- PSL NFA
type PSL_NFA is new Int32;
-- Indentation.
-- This is used by all packages that display vhdl code or informations.
Indentation : constant := 2;
-- String representing a date/time (format is YYYYMMDDHHmmSS.sss).
subtype Time_Stamp_String is String (1 .. 18);
type Time_Stamp_Id is new String8_Id;
Null_Time_Stamp : constant Time_Stamp_Id := 0;
-- In order to detect file changes, a checksum of the content is computed.
-- Currently SHA1 is used, but the cryptographic aspect is not a strong
-- requirement.
type File_Checksum_Id is new String8_Id;
No_File_Checksum_Id : constant File_Checksum_Id := 0;
-- String image of a File_Hash_Id. SHA1 digests are 5 * 32 bytes long, so
-- the hexadecimal image is 40 characters.
subtype File_Checksum_String is String (1 .. 40);
-- Self-explaining: raised when an internal error (such as consistency)
-- is detected.
Internal_Error: exception;
-- In some case, a low level subprogram can't handle error
-- (e.g eval_pos). In this case it is easier to raise an exception and
-- let upper level subprograms handle the case.
Node_Error : exception;
-- Result of a comparaison of two numeric values.
type Order_Type is (Less, Equal, Greater);
end Types;
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