1------------------------------------------------------------------------------
2--                                                                          --
3--                          GNAT SYSTEM UTILITIES                           --
4--                                                                          --
5--                              X O S C O N S                               --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 2008-2012, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
19-- http://www.gnu.org/licenses for a complete copy of the license.          --
20--                                                                          --
21-- GNAT was originally developed  by the GNAT team at  New York University. --
22-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23--                                                                          --
24------------------------------------------------------------------------------
25
26--  The base name of the template file is given by Argument (1). This program
27--  generates the spec for this specified unit (let's call it UNIT_NAME).
28
29--  It works in conjunction with a C template file which must be pre-processed
30--  and compiled using the cross compiler. Two input files are used:
31--    - the preprocessed C file: UNIT_NAME-tmplt.i
32--    - the generated assembly file: UNIT_NAME-tmplt.s
33
34--  The generated files are UNIT_NAME.ads and UNIT_NAME.h
35
36with Ada.Characters.Handling;    use Ada.Characters.Handling;
37with Ada.Command_Line;           use Ada.Command_Line;
38with Ada.Exceptions;             use Ada.Exceptions;
39with Ada.Streams.Stream_IO;      use Ada.Streams.Stream_IO;
40with Ada.Strings.Fixed;          use Ada.Strings.Fixed;
41with Ada.Strings.Maps;           use Ada.Strings.Maps;
42with Ada.Strings.Maps.Constants; use Ada.Strings.Maps.Constants;
43with Ada.Text_IO;                use Ada.Text_IO;
44
45pragma Warnings (Off);
46--  System.Unsigned_Types is an internal GNAT unit
47with System.Unsigned_Types;   use System.Unsigned_Types;
48pragma Warnings (On);
49
50with GNAT.String_Split; use GNAT.String_Split;
51with GNAT.Table;
52
53with XUtil; use XUtil;
54
55procedure XOSCons is
56
57   use Ada.Strings;
58   use ASCII;
59
60   Unit_Name : constant String := Argument (1);
61   Tmpl_Name : constant String := Unit_Name & "-tmplt";
62
63   -------------------------------------------------
64   -- Information retrieved from assembly listing --
65   -------------------------------------------------
66
67   type String_Access is access all String;
68   --  Note: we can't use GNAT.Strings for this definition, since that unit
69   --  is not available in older base compilers.
70
71   --  We need to deal with integer values that can be signed or unsigned, so
72   --  we need to accommodate the maximum range of both cases.
73
74   type Int_Value_Type is record
75      Positive  : Boolean;
76      Abs_Value : Long_Unsigned := 0;
77   end record;
78
79   function ">" (V1, V2 : Int_Value_Type) return Boolean;
80   function "<" (V1, V2 : Int_Value_Type) return Boolean;
81
82   type Asm_Info_Kind is
83     (CND,     --  Named number (decimal)
84      CNU,     --  Named number (decimal, unsigned)
85      CNS,     --  Named number (freeform text)
86      C,       --  Constant object
87      SUB,     --  Subtype
88      TXT);    --  Literal text
89   --  Recognized markers found in assembly file. These markers are produced by
90   --  the same-named macros from the C template.
91
92   subtype Asm_Int_Kind is Asm_Info_Kind range CND .. CNU;
93   --  Asm_Info_Kind values with int values in input
94
95   subtype Named_Number is Asm_Info_Kind range CND .. CNS;
96   --  Asm_Info_Kind values with named numbers in output
97
98   type Asm_Info (Kind : Asm_Info_Kind := TXT) is record
99      Line_Number   : Integer;
100      --  Line number in C source file
101
102      Constant_Name : String_Access;
103      --  Name of constant to be defined
104
105      Constant_Type : String_Access;
106      --  Type of constant (case of Kind = C)
107
108      Value_Len     : Natural := 0;
109      --  Length of text representation of constant's value
110
111      Text_Value    : String_Access;
112      --  Value for CNS / C constant
113
114      Int_Value     : Int_Value_Type;
115      --  Value for CND / CNU constant
116
117      Comment       : String_Access;
118      --  Additional descriptive comment for constant, or free-form text (TXT)
119   end record;
120
121   package Asm_Infos is new GNAT.Table
122     (Table_Component_Type => Asm_Info,
123      Table_Index_Type     => Integer,
124      Table_Low_Bound      => 1,
125      Table_Initial        => 100,
126      Table_Increment      => 10);
127
128   Max_Constant_Name_Len  : Natural := 0;
129   Max_Constant_Value_Len : Natural := 0;
130   Max_Constant_Type_Len  : Natural := 0;
131   --  Lengths of longest name and longest value
132
133   Size_Of_Unsigned_Int : Integer := 0;
134   --  Size of unsigned int on target
135
136   type Language is (Lang_Ada, Lang_C);
137
138   function Parse_Int (S : String; K : Asm_Int_Kind) return Int_Value_Type;
139   --  Parse a decimal number, preceded by an optional '$' or '#' character,
140   --  and return its value.
141
142   procedure Output_Info
143     (Lang       : Language;
144      OFile      : Sfile;
145      Info_Index : Integer);
146   --  Output information from the indicated asm info line
147
148   procedure Parse_Asm_Line (Line : String);
149   --  Parse one information line from the assembly source
150
151   function Contains_Template_Name (S : String) return Boolean;
152   --  True if S contains Tmpl_Name, possibly with different casing
153
154   function Spaces (Count : Integer) return String;
155   --  If Count is positive, return a string of Count spaces, else return an
156   --  empty string.
157
158   ---------
159   -- ">" --
160   ---------
161
162   function ">" (V1, V2 : Int_Value_Type) return Boolean is
163      P1 : Boolean renames V1.Positive;
164      P2 : Boolean renames V2.Positive;
165      A1 : Long_Unsigned renames V1.Abs_Value;
166      A2 : Long_Unsigned renames V2.Abs_Value;
167   begin
168      return (P1 and then not P2)
169        or else (P1 and then P2 and then A1 > A2)
170        or else (not P1 and then not P2 and then A1 < A2);
171   end ">";
172
173   ---------
174   -- "<" --
175   ---------
176
177   function "<" (V1, V2 : Int_Value_Type) return Boolean is
178   begin
179      return not (V1 > V2) and then not (V1 = V2);
180   end "<";
181
182   ----------------------------
183   -- Contains_Template_Name --
184   ----------------------------
185
186   function Contains_Template_Name (S : String) return Boolean is
187   begin
188      if Index (Source => To_Lower (S), Pattern => Tmpl_Name) > 0 then
189         return True;
190      else
191         return False;
192      end if;
193   end Contains_Template_Name;
194
195   -----------------
196   -- Output_Info --
197   -----------------
198
199   procedure Output_Info
200     (Lang       : Language;
201      OFile      : Sfile;
202      Info_Index : Integer)
203   is
204      Info : Asm_Info renames Asm_Infos.Table (Info_Index);
205
206      procedure Put (S : String);
207      --  Write S to OFile
208
209      ---------
210      -- Put --
211      ---------
212
213      procedure Put (S : String) is
214      begin
215         Put (OFile, S);
216      end Put;
217
218   --  Start of processing for Output_Info
219
220   begin
221      case Info.Kind is
222         when TXT =>
223
224            --  Handled in the common code for comments below
225
226            null;
227
228         when SUB =>
229            case Lang is
230               when Lang_Ada =>
231                  Put ("   subtype " & Info.Constant_Name.all
232                       & " is Interfaces.C."
233                       & Info.Text_Value.all & ";");
234               when Lang_C =>
235                  Put ("#define " & Info.Constant_Name.all & " "
236                       & Info.Text_Value.all);
237            end case;
238
239         when others =>
240
241            --  All named number cases
242
243            case Lang is
244               when Lang_Ada =>
245                  Put ("   " & Info.Constant_Name.all);
246                  Put (Spaces (Max_Constant_Name_Len
247                                 - Info.Constant_Name'Length));
248
249                  if Info.Kind in Named_Number then
250                     Put (" : constant := ");
251                  else
252                     Put (" : constant " & Info.Constant_Type.all);
253                     Put (Spaces (Max_Constant_Type_Len
254                                    - Info.Constant_Type'Length));
255                     Put (" := ");
256                  end if;
257
258               when Lang_C =>
259                  Put ("#define " & Info.Constant_Name.all & " ");
260                  Put (Spaces (Max_Constant_Name_Len
261                                 - Info.Constant_Name'Length));
262            end case;
263
264            if Info.Kind in Asm_Int_Kind then
265               if not Info.Int_Value.Positive then
266                  Put ("-");
267               end if;
268
269               Put (Trim (Info.Int_Value.Abs_Value'Img, Side => Left));
270
271            else
272               declare
273                  Is_String : constant Boolean :=
274                                Info.Kind = C
275                                  and then Info.Constant_Type.all = "String";
276
277               begin
278                  if Is_String then
279                     Put ("""");
280                  end if;
281
282                  Put (Info.Text_Value.all);
283
284                  if Is_String then
285                     Put ("""");
286                  end if;
287               end;
288            end if;
289
290            if Lang = Lang_Ada then
291               Put (";");
292
293               if Info.Comment'Length > 0 then
294                  Put (Spaces (Max_Constant_Value_Len - Info.Value_Len));
295                  Put (" --  ");
296               end if;
297            end if;
298      end case;
299
300      if Lang = Lang_Ada then
301         Put (Info.Comment.all);
302      end if;
303
304      New_Line (OFile);
305   end Output_Info;
306
307   --------------------
308   -- Parse_Asm_Line --
309   --------------------
310
311   procedure Parse_Asm_Line (Line : String) is
312      Index1, Index2 : Integer := Line'First;
313
314      function Field_Alloc return String_Access;
315      --  Allocate and return a copy of Line (Index1 .. Index2 - 1)
316
317      procedure Find_Colon (Index : in out Integer);
318      --  Increment Index until the next colon in Line
319
320      -----------------
321      -- Field_Alloc --
322      -----------------
323
324      function Field_Alloc return String_Access is
325      begin
326         return new String'(Line (Index1 .. Index2 - 1));
327      end Field_Alloc;
328
329      ----------------
330      -- Find_Colon --
331      ----------------
332
333      procedure Find_Colon (Index : in out Integer) is
334      begin
335         loop
336            Index := Index + 1;
337            exit when Index > Line'Last or else Line (Index) = ':';
338         end loop;
339      end Find_Colon;
340
341   --  Start of processing for Parse_Asm_Line
342
343   begin
344      Find_Colon (Index2);
345
346      declare
347         Info : Asm_Info (Kind => Asm_Info_Kind'Value
348                                    (Line (Line'First .. Index2 - 1)));
349      begin
350         Index1 := Index2 + 1;
351         Find_Colon (Index2);
352
353         Info.Line_Number :=
354           Integer (Parse_Int (Line (Index1 .. Index2 - 1), CNU).Abs_Value);
355
356         case Info.Kind is
357            when CND | CNU | CNS | C | SUB =>
358               Index1 := Index2 + 1;
359               Find_Colon (Index2);
360
361               Info.Constant_Name := Field_Alloc;
362
363               if Info.Kind /= SUB
364                    and then
365                  Info.Constant_Name'Length > Max_Constant_Name_Len
366               then
367                  Max_Constant_Name_Len := Info.Constant_Name'Length;
368               end if;
369
370               Index1 := Index2 + 1;
371               Find_Colon (Index2);
372
373               if Info.Kind = C then
374                  Info.Constant_Type := Field_Alloc;
375
376                  if Info.Constant_Type'Length > Max_Constant_Type_Len then
377                     Max_Constant_Type_Len := Info.Constant_Type'Length;
378                  end if;
379
380                  Index1 := Index2 + 1;
381                  Find_Colon (Index2);
382               end if;
383
384               if Info.Kind = CND or else Info.Kind = CNU then
385                  Info.Int_Value :=
386                    Parse_Int (Line (Index1 .. Index2 - 1), Info.Kind);
387                  Info.Value_Len := Info.Int_Value.Abs_Value'Img'Length - 1;
388
389                  if not Info.Int_Value.Positive then
390                     Info.Value_Len := Info.Value_Len + 1;
391                  end if;
392
393               else
394                  Info.Text_Value := Field_Alloc;
395                  Info.Value_Len  := Info.Text_Value'Length;
396               end if;
397
398               if Info.Constant_Name.all = "SIZEOF_unsigned_int" then
399                  Size_Of_Unsigned_Int :=
400                    8 * Integer (Info.Int_Value.Abs_Value);
401               end if;
402
403            when others =>
404               null;
405         end case;
406
407         Index1 := Index2 + 1;
408         Index2 := Line'Last + 1;
409         Info.Comment := Field_Alloc;
410
411         if Info.Kind = TXT then
412            Info.Text_Value := Info.Comment;
413
414         --  Update Max_Constant_Value_Len, but only if this constant has a
415         --  comment (else the value is allowed to be longer).
416
417         elsif Info.Comment'Length > 0 then
418            if Info.Value_Len > Max_Constant_Value_Len then
419               Max_Constant_Value_Len := Info.Value_Len;
420            end if;
421         end if;
422
423         Asm_Infos.Append (Info);
424      end;
425
426   exception
427      when E : others =>
428         Put_Line
429           (Standard_Error, "can't parse " & Line);
430         Put_Line
431           (Standard_Error, "exception raised: " & Exception_Information (E));
432   end Parse_Asm_Line;
433
434   ----------------
435   -- Parse_Cond --
436   ----------------
437
438   procedure Parse_Cond
439     (If_Line            : String;
440      Cond               : Boolean;
441      Tmpl_File          : Ada.Text_IO.File_Type;
442      Ada_Ofile, C_Ofile : Sfile;
443      Current_Line       : in out Integer)
444   is
445      function Get_Value (Name : String) return Int_Value_Type;
446      --  Returns the value of the variable Name
447
448      ---------------
449      -- Get_Value --
450      ---------------
451
452      function Get_Value (Name : String) return Int_Value_Type is
453      begin
454         if Is_Subset (To_Set (Name), Decimal_Digit_Set) then
455            return Parse_Int (Name, CND);
456
457         else
458            for K in 1 .. Asm_Infos.Last loop
459               if Asm_Infos.Table (K).Constant_Name /= null then
460                  if Name = Asm_Infos.Table (K).Constant_Name.all then
461                     return Asm_Infos.Table (K).Int_Value;
462                  end if;
463               end if;
464            end loop;
465
466            --  Not found returns 0
467
468            return (True, 0);
469         end if;
470      end Get_Value;
471
472      --  Local variables
473
474      Sline  : Slice_Set;
475      Line   : String (1 .. 256);
476      Last   : Integer;
477      Value1 : Int_Value_Type;
478      Value2 : Int_Value_Type;
479      Res    : Boolean;
480
481   --  Start of processing for Parse_Cond
482
483   begin
484      Create (Sline, If_Line, " ");
485
486      if Slice_Count (Sline) /= 4 then
487         Put_Line (Standard_Error, "can't parse " & If_Line);
488      end if;
489
490      Value1 := Get_Value (Slice (Sline, 2));
491      Value2 := Get_Value (Slice (Sline, 4));
492
493      if Slice (Sline, 3) = ">" then
494         Res := Cond and (Value1 > Value2);
495
496      elsif Slice (Sline, 3) = "<" then
497         Res := Cond and (Value1 < Value2);
498
499      elsif Slice (Sline, 3) = "=" then
500         Res := Cond and (Value1 = Value2);
501
502      elsif Slice (Sline, 3) = "/=" then
503         Res := Cond and (Value1 /= Value2);
504
505      else
506         --  No other operator can be used
507
508         Put_Line (Standard_Error, "unknown operator in " & If_Line);
509         Res := False;
510      end if;
511
512      Current_Line := Current_Line + 1;
513
514      loop
515         Get_Line (Tmpl_File, Line, Last);
516         Current_Line := Current_Line + 1;
517         exit when Line (1 .. Last) = "@END_IF";
518
519         if Line (1 .. 4) = "@IF " then
520            Parse_Cond
521              (Line (1 .. Last), Res,
522               Tmpl_File, Ada_Ofile, C_Ofile, Current_Line);
523
524         elsif Line (1 .. Last) = "@ELSE" then
525            Res := Cond and not Res;
526
527         elsif Res then
528            Put_Line (Ada_OFile, Line (1 .. Last));
529            Put_Line (C_OFile, Line (1 .. Last));
530         end if;
531      end loop;
532   end Parse_Cond;
533
534   ---------------
535   -- Parse_Int --
536   ---------------
537
538   function Parse_Int
539     (S : String;
540      K : Asm_Int_Kind) return Int_Value_Type
541   is
542      First  : Integer := S'First;
543      Result : Int_Value_Type;
544
545   begin
546      --  On some platforms, immediate integer values are prefixed with
547      --  a $ or # character in assembly output.
548
549      if S (First) = '$' or else S (First) = '#' then
550         First := First + 1;
551      end if;
552
553      if S (First) = '-' then
554         Result.Positive := False;
555         First := First + 1;
556      else
557         Result.Positive := True;
558      end if;
559
560      Result.Abs_Value := Long_Unsigned'Value (S (First .. S'Last));
561
562      if not Result.Positive and then K = CNU then
563
564         --  Negative value, but unsigned expected: take 2's complement
565         --  reciprocical value.
566
567         Result.Abs_Value := ((not Result.Abs_Value) + 1)
568                               and
569                             (Shift_Left (1, Size_Of_Unsigned_Int) - 1);
570         Result.Positive  := True;
571      end if;
572
573      return Result;
574
575   exception
576      when others =>
577         Put_Line (Standard_Error, "can't parse decimal value: " & S);
578         raise;
579   end Parse_Int;
580
581   ------------
582   -- Spaces --
583   ------------
584
585   function Spaces (Count : Integer) return String is
586   begin
587      if Count <= 0 then
588         return "";
589      else
590         return (1 .. Count => ' ');
591      end if;
592   end Spaces;
593
594   --  Local declarations
595
596   --  Input files
597
598   Tmpl_File_Name : constant String := Tmpl_Name & ".i";
599   Asm_File_Name  : constant String := Tmpl_Name & ".s";
600
601   --  Output files
602
603   Ada_File_Name : constant String := Unit_Name & ".ads";
604   C_File_Name   : constant String := Unit_Name & ".h";
605
606   Asm_File  : Ada.Text_IO.File_Type;
607   Tmpl_File : Ada.Text_IO.File_Type;
608   Ada_OFile : Sfile;
609   C_OFile   : Sfile;
610
611   Line : String (1 .. 256);
612   Last : Integer;
613   --  Line being processed
614
615   Current_Line : Integer;
616   Current_Info : Integer;
617   In_Comment   : Boolean;
618   In_Template  : Boolean;
619
620--  Start of processing for XOSCons
621
622begin
623   --  Load values from assembly file
624
625   Open (Asm_File, In_File, Asm_File_Name);
626   while not End_Of_File (Asm_File) loop
627      Get_Line (Asm_File, Line, Last);
628      if Last > 2 and then Line (1 .. 2) = "->" then
629         Parse_Asm_Line (Line (3 .. Last));
630      end if;
631   end loop;
632
633   Close (Asm_File);
634
635   --  Load C template and output definitions
636
637   Open   (Tmpl_File, In_File,  Tmpl_File_Name);
638   Create (Ada_OFile, Out_File, Ada_File_Name);
639   Create (C_OFile,   Out_File, C_File_Name);
640
641   Current_Line := 0;
642   Current_Info := Asm_Infos.First;
643   In_Comment   := False;
644
645   while not End_Of_File (Tmpl_File) loop
646      <<Get_One_Line>>
647      Get_Line (Tmpl_File, Line, Last);
648
649      if Last >= 2 and then Line (1 .. 2) = "# " then
650         declare
651            Index : Integer;
652
653         begin
654            Index := 3;
655            while Index <= Last and then Line (Index) in '0' .. '9' loop
656               Index := Index + 1;
657            end loop;
658
659            if Contains_Template_Name (Line (Index + 1 .. Last)) then
660               Current_Line := Integer'Value (Line (3 .. Index - 1));
661               In_Template  := True;
662               goto Get_One_Line;
663            else
664               In_Template := False;
665            end if;
666         end;
667
668      elsif In_Template then
669         if In_Comment then
670            if Line (1 .. Last) = "*/" then
671               Put_Line (C_OFile, Line (1 .. Last));
672               In_Comment := False;
673
674            elsif Last > 4 and then Line (1 .. 4) = "@IF " then
675               Parse_Cond
676                 (Line (1 .. Last), True,
677                  Tmpl_File, Ada_Ofile, C_Ofile, Current_Line);
678
679            else
680               Put_Line (Ada_OFile, Line (1 .. Last));
681               Put_Line (C_OFile, Line (1 .. Last));
682            end if;
683
684         elsif Line (1 .. Last) = "/*" then
685            Put_Line (C_OFile, Line (1 .. Last));
686            In_Comment := True;
687
688         elsif Asm_Infos.Table (Current_Info).Line_Number = Current_Line then
689            if Fixed.Index (Line, "/*NOGEN*/") = 0 then
690               Output_Info (Lang_Ada, Ada_OFile, Current_Info);
691               Output_Info (Lang_C,   C_OFile,   Current_Info);
692            end if;
693
694            Current_Info := Current_Info + 1;
695         end if;
696
697         Current_Line := Current_Line + 1;
698      end if;
699   end loop;
700
701   Close (Tmpl_File);
702
703exception
704   when others =>
705      Put_Line ("xoscons <base_name>");
706end XOSCons;
707