------------------------------------------------------------------------------ -- -- -- GNAT SYSTEM UTILITIES -- -- -- -- X O S C O N S -- -- -- -- B o d y -- -- -- -- Copyright (C) 2008, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT 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 distributed with GNAT; see file COPYING3. If not, go to -- -- http://www.gnu.org/licenses for a complete copy of the license. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This program generates the spec of System.OS_Constants (s-oscons.ads). -- It works in conjunction with a C template file which must be pre-processed -- and compiled using the cross compiler. Two input files are used: -- - the preprocessed C file: s-oscons-tmplt.i -- - the generated assembly file: s-oscons-tmplt.s -- The contents of s-oscons.ads is written on standard output. with Ada.Characters.Handling; use Ada.Characters.Handling; with Ada.Exceptions; use Ada.Exceptions; with Ada.Strings.Fixed; use Ada.Strings.Fixed; with Ada.Text_IO; use Ada.Text_IO; with Ada.Streams.Stream_IO; use Ada.Streams.Stream_IO; pragma Warnings (Off); -- System.Unsigned_Types is an internal GNAT unit with System.Unsigned_Types; use System.Unsigned_Types; pragma Warnings (On); with GNAT.Table; with XUtil; use XUtil; procedure XOSCons is use ASCII; use Ada.Strings; Unit_Name : constant String := "s-oscons"; Tmpl_Name : constant String := Unit_Name & "-tmplt"; ------------------------------------------------- -- Information retrieved from assembly listing -- ------------------------------------------------- -- We need to deal with integer values that can be signed or unsigned, -- so we need to cater for the maximum range of both cases. type String_Access is access all String; -- Note: we can't use GNAT.Strings for this definition, since that unit -- is not available in older base compilers. type Int_Value_Type is record Positive : Boolean; Abs_Value : Long_Unsigned := 0; end record; type Asm_Info_Kind is (CND, -- Constant (decimal) CNS, -- Constant (freeform string) TXT); -- Literal text -- Recognized markers found in assembly file. These markers are produced -- by the same-named macros from the C template. type Asm_Info (Kind : Asm_Info_Kind := TXT) is record Line_Number : Integer; -- Line number in C source file Constant_Name : String_Access; -- Name of constant to be defined Value_Len : Natural := 0; -- Length of text representation of constant's value Text_Value : String_Access; -- Value for CNS constant Int_Value : Int_Value_Type; -- Value for CND constant Comment : String_Access; -- Additional descriptive comment for constant, or free-form text (TXT) end record; package Asm_Infos is new GNAT.Table ( Table_Component_Type => Asm_Info, Table_Index_Type => Integer, Table_Low_Bound => 1, Table_Initial => 100, Table_Increment => 10); Max_Constant_Name_Len : Natural := 0; Max_Constant_Value_Len : Natural := 0; -- Longest name and longest value lengths procedure Output_Info (OFile : Sfile; Info_Index : Integer); -- Output information from the indicated asm info line procedure Parse_Asm_Line (Line : String); -- Parse one information line from the assembly source function Contains_Template_Name (S : String) return Boolean; -- True if S contains Tmpl_Name, possibly with different casing function Spaces (Count : Integer) return String; -- If Count is positive, return a string of Count spaces, else return an -- empty string. ---------------------------- -- Contains_Template_Name -- ---------------------------- function Contains_Template_Name (S : String) return Boolean is begin return Index (Source => To_Lower (S), Pattern => Tmpl_Name) > 0; end Contains_Template_Name; ----------------- -- Output_Info -- ----------------- procedure Output_Info (OFile : Sfile; Info_Index : Integer) is Info : Asm_Info renames Asm_Infos.Table (Info_Index); procedure Put (S : String); --------- -- Put -- --------- procedure Put (S : String) is begin Put (OFile, S); end Put; begin if Info.Kind /= TXT then -- TXT case is handled by the common code below Put (" "); Put (Info.Constant_Name.all); Put (Spaces (Max_Constant_Name_Len - Info.Constant_Name'Length)); Put (" : constant := "); if Info.Kind = CND then if not Info.Int_Value.Positive then Put ("-"); end if; Put (Trim (Info.Int_Value.Abs_Value'Img, Side => Left)); else Put (Info.Text_Value.all); end if; Put (";"); if Info.Comment'Length > 0 then Put (Spaces (Max_Constant_Value_Len - Info.Value_Len)); Put (" -- "); end if; end if; Put (Info.Comment.all); New_Line (OFile); end Output_Info; -------------------- -- Parse_Asm_Line -- -------------------- procedure Parse_Asm_Line (Line : String) is Index1, Index2 : Integer := Line'First; function Field_Alloc return String_Access; -- Allocate and return a copy of Line (Index1 .. Index2 - 1) procedure Find_Colon (Index : in out Integer); -- Increment Index until the next colon in Line function Parse_Int (S : String) return Int_Value_Type; -- Parse a decimal number, preceded by an optional '$' or '#' character, -- and return its value. ----------------- -- Field_Alloc -- ----------------- function Field_Alloc return String_Access is begin return new String'(Line (Index1 .. Index2 - 1)); end Field_Alloc; ---------------- -- Find_Colon -- ---------------- procedure Find_Colon (Index : in out Integer) is begin loop Index := Index + 1; exit when Index > Line'Last or else Line (Index) = ':'; end loop; end Find_Colon; --------------- -- Parse_Int -- --------------- function Parse_Int (S : String) return Int_Value_Type is First : Integer := S'First; Positive : Boolean; begin -- On some platforms, immediate integer values are prefixed with -- a $ or # character in assembly output. if S (First) = '$' or else S (First) = '#' then First := First + 1; end if; if S (First) = '-' then Positive := False; First := First + 1; else Positive := True; end if; return (Positive => Positive, Abs_Value => Long_Unsigned'Value (S (First .. S'Last))); exception when E : others => Put_Line (Standard_Error, "can't parse decimal value: " & S); raise; end Parse_Int; -- Start of processing for Parse_Asm_Line begin Find_Colon (Index2); declare Info : Asm_Info (Kind => Asm_Info_Kind'Value (Line (Line'First .. Index2 - 1))); begin Index1 := Index2 + 1; Find_Colon (Index2); Info.Line_Number := Integer (Parse_Int (Line (Index1 .. Index2 - 1)).Abs_Value); case Info.Kind is when CND | CNS => Index1 := Index2 + 1; Find_Colon (Index2); Info.Constant_Name := Field_Alloc; if Info.Constant_Name'Length > Max_Constant_Name_Len then Max_Constant_Name_Len := Info.Constant_Name'Length; end if; Index1 := Index2 + 1; Find_Colon (Index2); if Info.Kind = CND then Info.Int_Value := Parse_Int (Line (Index1 .. Index2 - 1)); Info.Value_Len := Index2 - Index1 - 1; else Info.Text_Value := Field_Alloc; Info.Value_Len := Info.Text_Value'Length; end if; when others => null; end case; Index1 := Index2 + 1; Index2 := Line'Last + 1; Info.Comment := Field_Alloc; if Info.Kind = TXT then Info.Text_Value := Info.Comment; -- Update Max_Constant_Value_Len, but only if this constant has -- a comment (else the value is allowed to be longer). elsif Info.Comment'Length > 0 then if Info.Value_Len > Max_Constant_Value_Len then Max_Constant_Value_Len := Info.Value_Len; end if; end if; Asm_Infos.Append (Info); end; exception when E : others => Put_Line (Standard_Error, "can't parse " & Line); Put_Line (Standard_Error, "exception raised: " & Exception_Information (E)); end Parse_Asm_Line; ------------ -- Spaces -- ------------ function Spaces (Count : Integer) return String is begin if Count <= 0 then return ""; else return (1 .. Count => ' '); end if; end Spaces; -- Local declarations Asm_File_Name : constant String := Tmpl_Name & ".s"; Tmpl_File_Name : constant String := Tmpl_Name & ".i"; Ada_File_Name : constant String := Unit_Name & ".ads"; Asm_File : Ada.Text_IO.File_Type; Tmpl_File : Ada.Text_IO.File_Type; OFile : Sfile; Line : String (1 .. 256); Last : Integer; -- Line being processed Current_Line : Integer; Current_Info : Integer; In_Comment : Boolean; In_Template : Boolean; -- Start of processing for XOSCons begin -- Load values from assembly file Open (Asm_File, In_File, Asm_File_Name); while not End_Of_File (Asm_File) loop Get_Line (Asm_File, Line, Last); if Last > 2 and then Line (1 .. 2) = "->" then Parse_Asm_Line (Line (3 .. Last)); end if; end loop; Close (Asm_File); -- Load C template and output definitions Open (Tmpl_File, In_File, Tmpl_File_Name); Create (OFile, Out_File, Ada_File_Name); Current_Line := 0; Current_Info := Asm_Infos.First; In_Comment := False; while not End_Of_File (Tmpl_File) loop <> Get_Line (Tmpl_File, Line, Last); if Last >= 2 and then Line (1 .. 2) = "# " then declare Index : Integer := 3; begin while Index <= Last and then Line (Index) in '0' .. '9' loop Index := Index + 1; end loop; if Contains_Template_Name (Line (Index + 1 .. Last)) then Current_Line := Integer'Value (Line (3 .. Index - 1)); In_Template := True; goto Get_One_Line; else In_Template := False; end if; end; elsif In_Template then if In_Comment then if Line (1 .. Last) = "*/" then In_Comment := False; else Put_Line (OFile, Line (1 .. Last)); end if; elsif Line (1 .. Last) = "/*" then In_Comment := True; elsif Asm_Infos.Table (Current_Info).Line_Number = Current_Line then Output_Info (OFile, Current_Info); Current_Info := Current_Info + 1; end if; Current_Line := Current_Line + 1; end if; end loop; Close (Tmpl_File); end XOSCons;