gcc/ada/xeinfo.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                          GNAT SYSTEM UTILITIES                           --
   4 --                                                                          --
   5 --                               X E I N F O                                --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2008, 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 --  Program to construct C header file a-einfo.h (C version of einfo.ads spec)
  27 --  for use by Gigi. This header file contains all definitions and access
  28 --  functions, but does not contain set procedures, since Gigi is not allowed
  29 --  to modify the GNAT tree)
  30
  31 --    Input files:
  32
  33 --       einfo.ads     spec of Einfo package
  34 --       einfo.adb     body of Einfo package
  35
  36 --    Output files:
  37
  38 --       a-einfo.h     Corresponding c header file
  39
  40 --  Note: It is assumed that the input files have been compiled without errors
  41
  42 --  An optional argument allows the specification of an output file name to
  43 --  override the default a-einfo.h file name for the generated output file.
  44
  45 --  Most, but not all of the functions in Einfo can be inlined in the C header.
  46 --  They are the functions identified by pragma Inline in the spec. Functions
  47 --  that cannot be inlined are simply defined in the header.
  48
  49 with Ada.Command_Line;              use Ada.Command_Line;
  50 with Ada.Strings.Unbounded;         use Ada.Strings.Unbounded;
  51 with Ada.Strings.Unbounded.Text_IO; use Ada.Strings.Unbounded.Text_IO;
  52 with Ada.Strings.Maps;              use Ada.Strings.Maps;
  53 with Ada.Strings.Maps.Constants;    use Ada.Strings.Maps.Constants;
  54 with Ada.Text_IO;                   use Ada.Text_IO;
  55
  56 with GNAT.Spitbol;                  use GNAT.Spitbol;
  57 with GNAT.Spitbol.Patterns;         use GNAT.Spitbol.Patterns;
  58 with GNAT.Spitbol.Table_Boolean;    use GNAT.Spitbol.Table_Boolean;
  59
  60 procedure XEinfo is
  61
  62    package TB renames GNAT.Spitbol.Table_Boolean;
  63
  64    Err : exception;
  65
  66    A         : VString := Nul;
  67    B         : VString := Nul;
  68    C         : VString := Nul;
  69    Expr      : VString := Nul;
  70    Filler    : VString := Nul;
  71    Fline     : VString := Nul;
  72    Formal    : VString := Nul;
  73    Formaltyp : VString := Nul;
  74    FN        : VString := Nul;
  75    Line      : VString := Nul;
  76    N         : VString := Nul;
  77    N1        : VString := Nul;
  78    N2        : VString := Nul;
  79    N3        : VString := Nul;
  80    Nam       : VString := Nul;
  81    Name      : VString := Nul;
  82    NewS      : VString := Nul;
  83    Nextlin   : VString := Nul;
  84    OldS      : VString := Nul;
  85    Rtn       : VString := Nul;
  86    Term      : VString := Nul;
  87
  88    InB : File_Type;
  89    --  Used to read initial header from body
  90
  91    InF   : File_Type;
  92    --  Used to read full text of both spec and body
  93
  94    Ofile : File_Type;
  95    --  Used to write output file
  96
  97    wsp      : constant Pattern := NSpan (' ' & ASCII.HT);
  98    Comment  : constant Pattern := wsp & "--";
  99    For_Rep  : constant Pattern := wsp & "for";
 100    Get_Func : constant Pattern := wsp * A & "function" & wsp
 101                                   & Break (' ') * Name;
 102    Inline   : constant Pattern := wsp & "pragma Inline (" & Break (')') * Name;
 103    Get_Pack : constant Pattern := wsp & "package ";
 104    Get_Enam : constant Pattern := wsp & Break (',') * N & ',';
 105    Find_Fun : constant Pattern := wsp & "function";
 106    F_Subtyp : constant Pattern := wsp * A & "subtype " & Break (' ') * N;
 107    G_Subtyp : constant Pattern := wsp & "subtype" & wsp & Break (' ') * NewS
 108                                   & wsp & "is" & wsp & Break (" ;") * OldS
 109                                   & wsp & ';' & wsp & Rtab (0);
 110    F_Typ    : constant Pattern := wsp * A & "type " & Break (' ') * N &
 111                                   " is (";
 112    Get_Nam  : constant Pattern := wsp * A & Break (",)") * Nam
 113                                   & Len (1) * Term;
 114    Get_Styp : constant Pattern := wsp * A & "subtype " & Break (' ') * N;
 115    Get_N1   : constant Pattern := wsp & Break (' ') * N1;
 116    Get_N2   : constant Pattern := wsp & "-- " & Rest * N2;
 117    Get_N3   : constant Pattern := wsp & Break (';') * N3;
 118    Get_FN   : constant Pattern := wsp * C & "function" & wsp
 119                                   & Break (" (") * FN;
 120    Is_Rturn : constant Pattern := BreakX ('r') & "return";
 121    Is_Begin : constant Pattern := wsp & "begin";
 122    Get_Asrt : constant Pattern := wsp & "pragma Assert";
 123    Semicoln : constant Pattern := BreakX (';');
 124    Get_Cmnt : constant Pattern := BreakX ('-') * A & "--";
 125    Get_Expr : constant Pattern := wsp & "return " & Break (';') * Expr;
 126    Chek_End : constant Pattern := wsp & "end" & BreakX (';') & ';';
 127    Get_B1   : constant Pattern := BreakX (' ') * A & " in " & Rest * B;
 128    Get_B2   : constant Pattern := BreakX (' ') * A & " = " & Rest * B;
 129    Get_B3   : constant Pattern := BreakX (' ') * A & " /= " & Rest * B;
 130    To_Paren : constant Pattern := wsp * Filler & '(';
 131    Get_Fml  : constant Pattern := Break (" :") * Formal & wsp & ':' & wsp
 132                                   & BreakX (" );") * Formaltyp;
 133    Nxt_Fml  : constant Pattern := wsp & "; ";
 134    Get_Rtn  : constant Pattern := wsp & "return" & wsp & BreakX (" ;") * Rtn;
 135    Rem_Prn  : constant Pattern := wsp & ')';
 136
 137    M : Match_Result;
 138
 139    Lineno : Natural := 0;
 140    --  Line number in spec
 141
 142    V   : Natural;
 143    Ctr : Natural;
 144
 145    Inlined : TB.Table (200);
 146    --  Inlined<N> = True for inlined function, False otherwise
 147
 148    Lastinlined : Boolean;
 149
 150    procedure Badfunc;
 151    --  Signal bad function in body
 152
 153    function Getlin return VString;
 154    --  Get non-comment line (comment lines skipped, also skips FOR rep clauses)
 155    --  Fatal error (raises End_Error exception) if end of file encountered
 156
 157    procedure Must (B : Boolean);
 158    --  Raises Err if the argument (a Match) call, returns False
 159
 160    procedure Sethead (Line : in out VString; Term : String);
 161    --  Process function header into C
 162
 163    -------------
 164    -- Badfunc --
 165    -------------
 166
 167    procedure Badfunc is
 168    begin
 169       Put_Line
 170         (Standard_Error,
 171          "Body for function " & FN & " does not meet requirements");
 172       raise Err;
 173    end Badfunc;
 174
 175    -------------
 176    -- Getlin --
 177    -------------
 178
 179    function Getlin return VString is
 180       Lin : VString;
 181
 182    begin
 183       loop
 184          Lin := Get_Line (InF);
 185          Lineno := Lineno + 1;
 186
 187          if Lin /= ""
 188            and then not Match (Lin, Comment)
 189            and then not Match (Lin, For_Rep)
 190          then
 191             return Lin;
 192          end if;
 193       end loop;
 194    end Getlin;
 195
 196    ----------
 197    -- Must --
 198    ----------
 199
 200    procedure Must (B : Boolean) is
 201    begin
 202       if not B then
 203          raise Err;
 204       end if;
 205    end Must;
 206
 207    -------------
 208    -- Sethead --
 209    -------------
 210
 211    procedure Sethead (Line : in out VString; Term : String) is
 212       Args : VString;
 213
 214    begin
 215       Must (Match (Line, Get_Func, ""));
 216       Args := Nul;
 217
 218       if Match (Line, To_Paren, "") then
 219          Args := Filler & '(';
 220
 221          loop
 222             Must (Match (Line, Get_Fml, ""));
 223             Append (Args, Formaltyp & ' ' & Formal);
 224             exit when not Match (Line, Nxt_Fml);
 225             Append (Args, ",");
 226          end loop;
 227
 228          Match (Line, Rem_Prn, "");
 229          Append (Args, ')');
 230       end if;
 231
 232       Must (Match (Line, Get_Rtn));
 233
 234       if Present (Inlined, Name) then
 235          Put_Line (Ofile, A & "INLINE " & Rtn & ' ' & Name & Args & Term);
 236       else
 237          Put_Line (Ofile, A &  Rtn & ' ' & Name & Args & Term);
 238       end if;
 239    end Sethead;
 240
 241 --  Start of processing for XEinfo
 242
 243 begin
 244    Anchored_Mode := True;
 245
 246    if Argument_Count > 0 then
 247       Create (Ofile, Out_File, Argument (1));
 248    else
 249       Create (Ofile, Out_File, "a-einfo.h");
 250    end if;
 251
 252    Open (InB, In_File, "einfo.adb");
 253    Open (InF, In_File, "einfo.ads");
 254
 255    Lineno := 0;
 256    loop
 257       Line := Get_Line (InF);
 258       Lineno := Lineno + 1;
 259       exit when Line = "";
 260
 261       Match (Line,
 262              "--                                 S p e c       ",
 263              "--                              C Header File    ");
 264       Match (Line, "--", "/*");
 265       Match (Line, Rtab (2) * A & "--", M);
 266       Replace (M, A & "*/");
 267       Put_Line (Ofile, Line);
 268    end loop;
 269
 270    Put_Line (Ofile, "");
 271
 272    --  Find and record pragma Inlines
 273
 274    loop
 275       Line := Get_Line (InF);
 276       exit when Match (Line, "   --  END XEINFO INLINES");
 277
 278       if Match (Line, Inline) then
 279          Set (Inlined, Name, True);
 280       end if;
 281    end loop;
 282
 283    --  Skip to package line
 284
 285    Reset (InF, In_File);
 286    Lineno := 0;
 287
 288    loop
 289       Line := Getlin;
 290       exit when Match (Line, Get_Pack);
 291    end loop;
 292
 293    V := 0;
 294    Line := Getlin;
 295    Must (Match (Line, wsp & "type Entity_Kind"));
 296
 297    --  Process entity kind code definitions
 298
 299    loop
 300       Line := Getlin;
 301       exit when not Match (Line, Get_Enam);
 302       Put_Line (Ofile, "   #define " & Rpad (N, 32) & " " & V);
 303       V := V + 1;
 304    end loop;
 305
 306    Must (Match (Line, wsp & Rest * N));
 307    Put_Line (Ofile, "   #define " & Rpad (N, 32) & ' ' & V);
 308    Line := Getlin;
 309
 310    Must (Match (Line, wsp & ");"));
 311    Put_Line (Ofile, "");
 312
 313    --  Loop through subtype and type declarations
 314
 315    loop
 316       Line := Getlin;
 317       exit when Match (Line, Find_Fun);
 318
 319       --  Case of a subtype declaration
 320
 321       if Match (Line, F_Subtyp) then
 322
 323          --  Case of a subtype declaration that is an abbreviation of the
 324          --  form subtype x is y, and if so generate the appropriate typedef
 325
 326          if Match (Line, G_Subtyp) then
 327             Put_Line (Ofile, A & "typedef " & OldS & ' ' & NewS & ';');
 328
 329          --  Otherwise the subtype must be declaring a subrange of Entity_Id
 330
 331          else
 332             Must (Match (Line, Get_Styp));
 333             Line := Getlin;
 334             Must (Match (Line, Get_N1));
 335
 336             loop
 337                Line := Get_Line (InF);
 338                Lineno := Lineno + 1;
 339                exit when not Match (Line, Get_N2);
 340             end loop;
 341
 342             Must (Match (Line, Get_N3));
 343             Put_Line (Ofile, A & "SUBTYPE (" & N & ", Entity_Kind, ");
 344             Put_Line (Ofile, A & "   " & N1 & ", " & N3 & ')');
 345             Put_Line (Ofile, "");
 346          end if;
 347
 348       --  Case of type declaration
 349
 350       elsif Match (Line, F_Typ) then
 351          --  Process type declaration (must be enumeration type)
 352
 353          Ctr := 0;
 354          Put_Line (Ofile, A & "typedef char " & N & ';');
 355
 356          loop
 357             Line := Getlin;
 358             Must (Match (Line, Get_Nam));
 359             Put_Line (Ofile, A & "#define " & Rpad (Nam, 25) & Ctr);
 360             Ctr := Ctr + 1;
 361             exit when Term /= ",";
 362          end loop;
 363
 364          Put_Line (Ofile, "");
 365
 366       --  Neither subtype nor type declaration
 367
 368       else
 369          raise Err;
 370       end if;
 371    end loop;
 372
 373    --  Process function declarations
 374    --  Note: Lastinlined used to control blank lines
 375
 376    Put_Line (Ofile, "");
 377    Lastinlined := True;
 378
 379    --  Loop through function declarations
 380
 381    while Match (Line, Get_FN) loop
 382
 383       --  Non-inlined function
 384
 385       if not Present (Inlined, FN) then
 386          Put_Line (Ofile, "");
 387          Put_Line
 388            (Ofile,
 389             "   #define " & FN & " einfo__" & Translate (FN, Lower_Case_Map));
 390
 391       --  Inlined function
 392
 393       else
 394          if not Lastinlined then
 395             Put_Line (Ofile, "");
 396          end if;
 397       end if;
 398
 399       --  Merge here to output spec
 400
 401       Sethead (Line, ";");
 402       Lastinlined := Get (Inlined, FN);
 403       Line := Getlin;
 404    end loop;
 405
 406    Put_Line (Ofile, "");
 407
 408    --  Read body to find inlined functions
 409
 410    Close (InB);
 411    Close (InF);
 412    Open (InF, In_File, "einfo.adb");
 413    Lineno := 0;
 414
 415    --  Loop through input lines to find bodies of inlined functions
 416
 417    while not End_Of_File (InF) loop
 418       Fline := Get_Line (InF);
 419
 420       if Match (Fline, Get_FN)
 421         and then Get (Inlined, FN)
 422       then
 423          --  Here we have an inlined function
 424
 425          if not Match (Fline, Is_Rturn) then
 426             Line := Fline;
 427             Badfunc;
 428          end if;
 429
 430          Line := Getlin;
 431
 432          if not Match (Line, Is_Begin) then
 433             Badfunc;
 434          end if;
 435
 436          --  Skip past pragma Asserts
 437
 438          loop
 439             Line := Getlin;
 440             exit when not Match (Line, Get_Asrt);
 441
 442             --  Pragma assert found, get its continuation lines
 443
 444             loop
 445                exit when Match (Line, Semicoln);
 446                Line := Getlin;
 447             end loop;
 448          end loop;
 449
 450          --  Process return statement
 451
 452          Match (Line, Get_Cmnt, M);
 453          Replace (M, A);
 454
 455          --  Get continuations of return statement
 456
 457          while not Match (Line, Semicoln) loop
 458             Nextlin := Getlin;
 459             Match (Nextlin, wsp, " ");
 460             Append (Line, Nextlin);
 461          end loop;
 462
 463          if not Match (Line, Get_Expr) then
 464             Badfunc;
 465          end if;
 466
 467          Line := Getlin;
 468
 469          if not Match (Line, Chek_End) then
 470             Badfunc;
 471          end if;
 472
 473          Match (Expr, Get_B1, M);
 474          Replace (M, "IN (" & A & ", " & B & ')');
 475          Match (Expr, Get_B2, M);
 476          Replace (M, A & " == " & B);
 477          Match (Expr, Get_B3, M);
 478          Replace (M, A & " != " & B);
 479          Put_Line (Ofile, "");
 480          Sethead (Fline, "");
 481          Put_Line (Ofile, C & "   { return " & Expr & "; }");
 482       end if;
 483    end loop;
 484
 485    Put_Line (Ofile, "");
 486    Put_Line
 487      (Ofile,
 488       "/* End of einfo.h (C version of Einfo package specification) */");
 489
 490 exception
 491    when Err =>
 492       Put_Line (Standard_Error, Lineno & ".  " & Line);
 493       Put_Line (Standard_Error, "**** fatal error ****");
 494       Set_Exit_Status (1);
 495
 496    when End_Error =>
 497       Put_Line (Standard_Error, "unexpected end of file");
 498       Put_Line (Standard_Error, "**** fatal error ****");
 499
 500 end XEinfo;