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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;
with System;
with Ada.Unchecked_Conversion;
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;
-- 64 bits integer.
type Int64 is range -2**63 .. 2**63 - 1;
for Int64'Size use 64;
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 Uns64 is new Interfaces.Unsigned_64;
type Fp64 is new Interfaces.IEEE_Float_64;
type Fp32 is new Interfaces.IEEE_Float_32;
-- The verilog logic type (when used in a vector).
-- Coding of 01zx:
-- For 0 and 1, ZX is 0, VAL is the bit value.
-- For z: ZX is 1, VAL is 0.
-- For x: ZX is 1, VAL is 1.
type Logic_32 is record
Val : Uns32; -- AKA aval
Zx : Uns32; -- AKA bval
end record;
-- 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;
-- Fat strings, for compatibility with C.
type Thin_String_Ptr is access String (Positive);
pragma Convention (C, Thin_String_Ptr);
function To_Thin_String_Ptr is new Ada.Unchecked_Conversion
(System.Address, Thin_String_Ptr);
-- 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.
No_Name_Id : constant Name_Id := 0;
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 Uns32;
for String8_Id'Size use 32;
Null_String8 : constant String8_Id := 0;
-- The length of a string is not stored in the string table. Create a
-- tuple that is meaningful.
type String8_Len_Type is record
Str : String8_Id;
Len : Nat32;
end record;
-- Index type is the source file table.
-- This table is defined in the files_map package.
type Source_File_Entry is new Uns32;
No_Source_File_Entry: constant Source_File_Entry := 0;
-- Index into a file buffer. Use a signed integers, so that empty string
-- works correctly.
type Source_Ptr is new Int32 range 0 .. Int32'Last;
-- 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;
type File_Buffer_Ptr is access File_Buffer (Source_Ptr);
function To_File_Buffer_Ptr is new Ada.Unchecked_Conversion
(System.Address, File_Buffer_Ptr);
-- 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;
-- Source coordinates. An expanded form of location, almost ready to be
-- printed.
-- FILE is the reference to the source file.
-- LINE_POS is the position in the source file of the first character of
-- the line. It usually comes for free but can be a little bit difficult
-- to compute if the line table is being built.
-- LINE is the line number; first line is 1 and 0 means unknown.
-- OFFSET is the index in the line; first character is 0, any character
-- (even tabulation) counts as 1 character.
type Source_Coord_Type is record
File : Source_File_Entry;
Line_Pos : Source_Ptr;
Line : Natural;
Offset : Natural;
end record;
No_Source_Coord : constant Source_Coord_Type :=
(No_Source_File_Entry, Source_Ptr_Bad, 0, 0);
-- Indentation.
-- This is used by all packages that display vhdl code or informations.
Indentation : constant := 2;
-- For array dimensions. First dimension is 1.
type Dim_Type is new Pos32;
-- 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;
-- Unrecoverable error. Just exit() with an error status.
Fatal_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);
-- Direction for a range. Used by many HDLs!
type Direction_Type is (Dir_To, Dir_Downto);
-- Modular type for the size. We don't use Storage_Offset in order to
-- make alignment computation efficient (knowing that alignment is a
-- power of two).
type Size_Type is mod System.Memory_Size;
end Types;
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