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) 1992-2011, 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 with CEinfo;
  61
  62 procedure XEinfo is
  63
  64    package TB renames GNAT.Spitbol.Table_Boolean;
  65
  66    Err : exception;
  67
  68    A         : VString := Nul;
  69    B         : VString := Nul;
  70    C         : VString := Nul;
  71    Expr      : VString := Nul;
  72    Filler    : VString := Nul;
  73    Fline     : VString := Nul;
  74    Formal    : VString := Nul;
  75    Formaltyp : VString := Nul;
  76    FN        : VString := Nul;
  77    Line      : VString := Nul;
  78    N         : VString := Nul;
  79    N1        : VString := Nul;
  80    N2        : VString := Nul;
  81    N3        : VString := Nul;
  82    Nam       : VString := Nul;
  83    Name      : VString := Nul;
  84    NewS      : VString := Nul;
  85    Nextlin   : VString := Nul;
  86    OldS      : VString := Nul;
  87    Rtn       : VString := Nul;
  88    Term      : VString := Nul;
  89
  90    InB : File_Type;
  91    --  Used to read initial header from body
  92
  93    InF   : File_Type;
  94    --  Used to read full text of both spec and body
  95
  96    Ofile : File_Type;
  97    --  Used to write output file
  98
  99    wsp      : constant Pattern := NSpan (' ' & ASCII.HT);
 100    Comment  : constant Pattern := wsp & "--";
 101    For_Rep  : constant Pattern := wsp & "for";
 102    Get_Func : constant Pattern := wsp * A & "function" & wsp
 103                                   & Break (' ') * Name;
 104    Inline   : constant Pattern := wsp & "pragma Inline (" & Break (')') * Name;
 105    Get_Pack : constant Pattern := wsp & "package ";
 106    Get_Enam : constant Pattern := wsp & Break (',') * N & ',';
 107    Find_Fun : constant Pattern := wsp & "function";
 108    F_Subtyp : constant Pattern := wsp * A & "subtype " & Break (' ') * N;
 109    G_Subtyp : constant Pattern := wsp & "subtype" & wsp & Break (' ') * NewS
 110                                   & wsp & "is" & wsp & Break (" ;") * OldS
 111                                   & wsp & ';' & wsp & Rtab (0);
 112    F_Typ    : constant Pattern := wsp * A & "type " & Break (' ') * N &
 113                                   " is (";
 114    Get_Nam  : constant Pattern := wsp * A & Break (",)") * Nam
 115                                   & Len (1) * Term;
 116    Get_Styp : constant Pattern := wsp * A & "subtype " & Break (' ') * N;
 117    Get_N1   : constant Pattern := wsp & Break (' ') * N1;
 118    Get_N2   : constant Pattern := wsp & "-- " & Rest * N2;
 119    Get_N3   : constant Pattern := wsp & Break (';') * N3;
 120    Get_FN   : constant Pattern := wsp * C & "function" & wsp
 121                                   & Break (" (") * FN;
 122    Is_Rturn : constant Pattern := BreakX ('r') & "return";
 123    Is_Begin : constant Pattern := wsp & "begin";
 124    Get_Asrt : constant Pattern := wsp & "pragma Assert";
 125    Semicoln : constant Pattern := BreakX (';');
 126    Get_Cmnt : constant Pattern := BreakX ('-') * A & "--";
 127    Get_Expr : constant Pattern := wsp & "return " & Break (';') * Expr;
 128    Chek_End : constant Pattern := wsp & "end" & BreakX (';') & ';';
 129    Get_B1   : constant Pattern := BreakX (' ') * A & " in " & Rest * B;
 130    Get_B2   : constant Pattern := BreakX (' ') * A & " = " & Rest * B;
 131    Get_B3   : constant Pattern := BreakX (' ') * A & " /= " & Rest * B;
 132    To_Paren : constant Pattern := wsp * Filler & '(';
 133    Get_Fml  : constant Pattern := Break (" :") * Formal & wsp & ':' & wsp
 134                                   & BreakX (" );") * Formaltyp;
 135    Nxt_Fml  : constant Pattern := wsp & "; ";
 136    Get_Rtn  : constant Pattern := wsp & "return" & wsp & BreakX (" ;") * Rtn;
 137    Rem_Prn  : constant Pattern := wsp & ')';
 138
 139    M : Match_Result;
 140
 141    Lineno : Natural := 0;
 142    --  Line number in spec
 143
 144    V   : Natural;
 145    Ctr : Natural;
 146
 147    Inlined : TB.Table (200);
 148    --  Inlined<N> = True for inlined function, False otherwise
 149
 150    Lastinlined : Boolean;
 151
 152    procedure Badfunc;
 153    --  Signal bad function in body
 154
 155    function Getlin return VString;
 156    --  Get non-comment line (comment lines skipped, also skips FOR rep clauses)
 157    --  Fatal error (raises End_Error exception) if end of file encountered
 158
 159    procedure Must (B : Boolean);
 160    --  Raises Err if the argument (a Match) call, returns False
 161
 162    procedure Sethead (Line : in out VString; Term : String);
 163    --  Process function header into C
 164
 165    -------------
 166    -- Badfunc --
 167    -------------
 168
 169    procedure Badfunc is
 170    begin
 171       Put_Line
 172         (Standard_Error,
 173          "Body for function " & FN & " does not meet requirements");
 174       raise Err;
 175    end Badfunc;
 176
 177    -------------
 178    -- Getlin --
 179    -------------
 180
 181    function Getlin return VString is
 182       Lin : VString;
 183
 184    begin
 185       loop
 186          Lin := Get_Line (InF);
 187          Lineno := Lineno + 1;
 188
 189          if Lin /= ""
 190            and then not Match (Lin, Comment)
 191            and then not Match (Lin, For_Rep)
 192          then
 193             return Lin;
 194          end if;
 195       end loop;
 196    end Getlin;
 197
 198    ----------
 199    -- Must --
 200    ----------
 201
 202    procedure Must (B : Boolean) is
 203    begin
 204       if not B then
 205          raise Err;
 206       end if;
 207    end Must;
 208
 209    -------------
 210    -- Sethead --
 211    -------------
 212
 213    procedure Sethead (Line : in out VString; Term : String) is
 214       Args : VString;
 215
 216    begin
 217       Must (Match (Line, Get_Func, ""));
 218       Args := Nul;
 219
 220       if Match (Line, To_Paren, "") then
 221          Args := Filler & '(';
 222
 223          loop
 224             Must (Match (Line, Get_Fml, ""));
 225             Append (Args, Formaltyp & ' ' & Formal);
 226             exit when not Match (Line, Nxt_Fml);
 227             Append (Args, ",");
 228          end loop;
 229
 230          Match (Line, Rem_Prn, "");
 231          Append (Args, ')');
 232       end if;
 233
 234       Must (Match (Line, Get_Rtn));
 235
 236       if Present (Inlined, Name) then
 237          Put_Line (Ofile, A & "INLINE " & Rtn & ' ' & Name & Args & Term);
 238       else
 239          Put_Line (Ofile, A &  Rtn & ' ' & Name & Args & Term);
 240       end if;
 241    end Sethead;
 242
 243 --  Start of processing for XEinfo
 244
 245 begin
 246    --  First run CEinfo to check for errors. Note that CEinfo is also a
 247    --  stand-alone program that can be run separately.
 248
 249    CEinfo;
 250
 251    Anchored_Mode := True;
 252
 253    if Argument_Count > 0 then
 254       Create (Ofile, Out_File, Argument (1));
 255    else
 256       Create (Ofile, Out_File, "a-einfo.h");
 257    end if;
 258
 259    Open (InB, In_File, "einfo.adb");
 260    Open (InF, In_File, "einfo.ads");
 261
 262    Lineno := 0;
 263    loop
 264       Line := Get_Line (InF);
 265       Lineno := Lineno + 1;
 266       exit when Line = "";
 267
 268       Match (Line,
 269              "--                                 S p e c       ",
 270              "--                              C Header File    ");
 271       Match (Line, "--", "/*");
 272       Match (Line, Rtab (2) * A & "--", M);
 273       Replace (M, A & "*/");
 274       Put_Line (Ofile, Line);
 275    end loop;
 276
 277    Put_Line (Ofile, "");
 278
 279    Put_Line (Ofile, "#ifdef __cplusplus");
 280    Put_Line (Ofile, "extern ""C"" {");
 281    Put_Line (Ofile, "#endif");
 282
 283    --  Find and record pragma Inlines
 284
 285    loop
 286       Line := Get_Line (InF);
 287       exit when Match (Line, "   --  END XEINFO INLINES");
 288
 289       if Match (Line, Inline) then
 290          Set (Inlined, Name, True);
 291       end if;
 292    end loop;
 293
 294    --  Skip to package line
 295
 296    Reset (InF, In_File);
 297    Lineno := 0;
 298
 299    loop
 300       Line := Getlin;
 301       exit when Match (Line, Get_Pack);
 302    end loop;
 303
 304    V := 0;
 305    Line := Getlin;
 306    Must (Match (Line, wsp & "type Entity_Kind"));
 307
 308    --  Process entity kind code definitions
 309
 310    loop
 311       Line := Getlin;
 312       exit when not Match (Line, Get_Enam);
 313       Put_Line (Ofile, "   #define " & Rpad (N, 32) & " " & V);
 314       V := V + 1;
 315    end loop;
 316
 317    Must (Match (Line, wsp & Rest * N));
 318    Put_Line (Ofile, "   #define " & Rpad (N, 32) & ' ' & V);
 319    Line := Getlin;
 320
 321    Must (Match (Line, wsp & ");"));
 322    Put_Line (Ofile, "");
 323
 324    --  Loop through subtype and type declarations
 325
 326    loop
 327       Line := Getlin;
 328       exit when Match (Line, Find_Fun);
 329
 330       --  Case of a subtype declaration
 331
 332       if Match (Line, F_Subtyp) then
 333
 334          --  Case of a subtype declaration that is an abbreviation of the
 335          --  form subtype x is y, and if so generate the appropriate typedef
 336
 337          if Match (Line, G_Subtyp) then
 338             Put_Line (Ofile, A & "typedef " & OldS & ' ' & NewS & ';');
 339
 340          --  Otherwise the subtype must be declaring a subrange of Entity_Id
 341
 342          else
 343             Must (Match (Line, Get_Styp));
 344             Line := Getlin;
 345             Must (Match (Line, Get_N1));
 346
 347             loop
 348                Line := Get_Line (InF);
 349                Lineno := Lineno + 1;
 350                exit when not Match (Line, Get_N2);
 351             end loop;
 352
 353             Must (Match (Line, Get_N3));
 354             Put_Line (Ofile, A & "SUBTYPE (" & N & ", Entity_Kind, ");
 355             Put_Line (Ofile, A & "   " & N1 & ", " & N3 & ')');
 356             Put_Line (Ofile, "");
 357          end if;
 358
 359       --  Case of type declaration
 360
 361       elsif Match (Line, F_Typ) then
 362
 363          --  Process type declaration (must be enumeration type)
 364
 365          Ctr := 0;
 366          Put_Line (Ofile, A & "typedef char " & N & ';');
 367
 368          loop
 369             Line := Getlin;
 370             Must (Match (Line, Get_Nam));
 371             Put_Line (Ofile, A & "#define " & Rpad (Nam, 25) & Ctr);
 372             Ctr := Ctr + 1;
 373             exit when Term /= ",";
 374          end loop;
 375
 376          Put_Line (Ofile, "");
 377
 378       --  Neither subtype nor type declaration
 379
 380       else
 381          raise Err;
 382       end if;
 383    end loop;
 384
 385    --  Process function declarations
 386
 387    --  Note: Lastinlined used to control blank lines
 388
 389    Put_Line (Ofile, "");
 390    Lastinlined := True;
 391
 392    --  Loop through function declarations
 393
 394    while Match (Line, Get_FN) loop
 395
 396       --  Non-inlined function
 397
 398       if not Present (Inlined, FN) then
 399          Put_Line (Ofile, "");
 400          Put_Line
 401            (Ofile,
 402             "   #define " & FN & " einfo__" & Translate (FN, Lower_Case_Map));
 403
 404       --  Inlined function
 405
 406       else
 407          if not Lastinlined then
 408             Put_Line (Ofile, "");
 409          end if;
 410       end if;
 411
 412       --  Merge here to output spec
 413
 414       Sethead (Line, ";");
 415       Lastinlined := Get (Inlined, FN);
 416       Line := Getlin;
 417    end loop;
 418
 419    Put_Line (Ofile, "");
 420
 421    --  Read body to find inlined functions
 422
 423    Close (InB);
 424    Close (InF);
 425    Open (InF, In_File, "einfo.adb");
 426    Lineno := 0;
 427
 428    --  Loop through input lines to find bodies of inlined functions
 429
 430    while not End_Of_File (InF) loop
 431       Fline := Get_Line (InF);
 432
 433       if Match (Fline, Get_FN)
 434         and then Get (Inlined, FN)
 435       then
 436          --  Here we have an inlined function
 437
 438          if not Match (Fline, Is_Rturn) then
 439             Line := Fline;
 440             Badfunc;
 441          end if;
 442
 443          Line := Getlin;
 444
 445          if not Match (Line, Is_Begin) then
 446             Badfunc;
 447          end if;
 448
 449          --  Skip past pragma Asserts
 450
 451          loop
 452             Line := Getlin;
 453             exit when not Match (Line, Get_Asrt);
 454
 455             --  Pragma assert found, get its continuation lines
 456
 457             loop
 458                exit when Match (Line, Semicoln);
 459                Line := Getlin;
 460             end loop;
 461          end loop;
 462
 463          --  Process return statement
 464
 465          Match (Line, Get_Cmnt, M);
 466          Replace (M, A);
 467
 468          --  Get continuations of return statement
 469
 470          while not Match (Line, Semicoln) loop
 471             Nextlin := Getlin;
 472             Match (Nextlin, wsp, " ");
 473             Append (Line, Nextlin);
 474          end loop;
 475
 476          if not Match (Line, Get_Expr) then
 477             Badfunc;
 478          end if;
 479
 480          Line := Getlin;
 481
 482          if not Match (Line, Chek_End) then
 483             Badfunc;
 484          end if;
 485
 486          Match (Expr, Get_B1, M);
 487          Replace (M, "IN (" & A & ", " & B & ')');
 488          Match (Expr, Get_B2, M);
 489          Replace (M, A & " == " & B);
 490          Match (Expr, Get_B3, M);
 491          Replace (M, A & " != " & B);
 492          Put_Line (Ofile, "");
 493          Sethead (Fline, "");
 494          Put_Line (Ofile, C & "   { return " & Expr & "; }");
 495       end if;
 496    end loop;
 497
 498    Put_Line (Ofile, "");
 499
 500    Put_Line (Ofile, "#ifdef __cplusplus");
 501    Put_Line (Ofile, "}");
 502    Put_Line (Ofile, "#endif");
 503
 504    Put_Line
 505      (Ofile,
 506       "/* End of einfo.h (C version of Einfo package specification) */");
 507
 508    Close (InF);
 509    Close (Ofile);
 510
 511 exception
 512    when Err =>
 513       Put_Line (Standard_Error, Lineno & ".  " & Line);
 514       Put_Line (Standard_Error, "**** fatal error ****");
 515       Set_Exit_Status (1);
 516
 517    when End_Error =>
 518       Put_Line (Standard_Error, "unexpected end of file");
 519       Put_Line (Standard_Error, "**** fatal error ****");
 520
 521 end XEinfo;