gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include "hconfig.h"
  23 #include "system.h"
  24
  25 #define NO_GENRTL_H
  26 #include "rtl.h"
  27 #undef abort
  28
  29 #include "real.h"
  30
  31 /* Calculate the format for CONST_DOUBLE.  This depends on the relative
  32    widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
  33
  34    We need to go out to e0wwwww, since REAL_ARITHMETIC assumes 16-bits
  35    per element in REAL_VALUE_TYPE.
  36
  37    This is duplicated in rtl.c.
  38
  39    A number of places assume that there are always at least two 'w'
  40    slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
  41
  42 #ifdef REAL_ARITHMETIC
  43 # if MAX_LONG_DOUBLE_TYPE_SIZE == 96
  44 #  define REAL_WIDTH    \
  45      (11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  46 # else
  47 #  if MAX_LONG_DOUBLE_TYPE_SIZE == 128
  48 #   define REAL_WIDTH   \
  49       (19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  50 #  else
  51 #   if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
  52 #    define REAL_WIDTH  \
  53       (7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  54 #   endif
  55 #  endif
  56 # endif
  57 #endif /* REAL_ARITHMETIC */
  58
  59 #ifndef REAL_WIDTH
  60 # if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
  61 #  define REAL_WIDTH    2
  62 # else
  63 #  if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
  64 #   define REAL_WIDTH   3
  65 #  else
  66 #   if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
  67 #    define REAL_WIDTH  4
  68 #   endif
  69 #  endif
  70 # endif
  71 #endif /* REAL_WIDTH */
  72
  73 #if REAL_WIDTH == 1
  74 # define CONST_DOUBLE_FORMAT    "e0ww"
  75 #else
  76 # if REAL_WIDTH == 2
  77 #  define CONST_DOUBLE_FORMAT   "e0ww"
  78 # else
  79 #  if REAL_WIDTH == 3
  80 #   define CONST_DOUBLE_FORMAT  "e0www"
  81 #  else
  82 #   if REAL_WIDTH == 4
  83 #    define CONST_DOUBLE_FORMAT "e0wwww"
  84 #   else
  85 #    if REAL_WIDTH == 5
  86 #     define CONST_DOUBLE_FORMAT        "e0wwwww"
  87 #    else
  88 #     define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
  89 #    endif
  90 #   endif
  91 #  endif
  92 # endif
  93 #endif
  94
  95
  96 struct rtx_definition
  97 {
  98   const char *enumname, *name, *format;
  99 };
 100
 101 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGX(ENUM), NAME, FORMAT },
 102
 103 struct rtx_definition defs[] =
 104 {
 105 #include "rtl.def"              /* rtl expressions are documented here */
 106 };
 107
 108 const char *formats[NUM_RTX_CODE];
 109
 110 static const char *type_from_format     PARAMS ((int));
 111 static const char *accessor_from_format PARAMS ((int));
 112 static int special_format               PARAMS ((const char *));
 113 static int special_rtx                  PARAMS ((int));
 114 static void find_formats                PARAMS ((void));
 115 static void gendecl                     PARAMS ((const char *));
 116 static void genmacro                    PARAMS ((int));
 117 static void gendef                      PARAMS ((const char *));
 118 static void genlegend                   PARAMS ((void));
 119 static void genheader                   PARAMS ((void));
 120 static void gencode                     PARAMS ((void));
 121 \f
 122 /* Decode a format letter into a C type string.  */
 123
 124 static const char *
 125 type_from_format (c)
 126      int c;
 127 {
 128   switch (c)
 129     {
 130     case 'i':
 131       return "int ";
 132
 133     case 'w':
 134       return "HOST_WIDE_INT ";
 135
 136     case 's':
 137       return "const char *";
 138
 139     case 'e':  case 'u':
 140       return "rtx ";
 141
 142     case 'E':
 143       return "rtvec ";
 144     case 'b':
 145       return "struct bitmap_head_def *";  /* bitmap - typedef not available */
 146     case 't':
 147       return "union tree_node *";  /* tree - typedef not available */
 148     default:
 149       abort ();
 150     }
 151 }
 152
 153 /* Decode a format letter into the proper accessor function.  */
 154
 155 static const char *
 156 accessor_from_format (c)
 157      int c;
 158 {
 159   switch (c)
 160     {
 161     case 'i':
 162       return "XINT";
 163
 164     case 'w':
 165       return "XWINT";
 166
 167     case 's':
 168       return "XSTR";
 169
 170     case 'e':  case 'u':
 171       return "XEXP";
 172
 173     case 'E':
 174       return "XVEC";
 175
 176     case 'b':
 177       return "XBITMAP";
 178
 179     case 't':
 180       return "XTREE";
 181
 182     default:
 183       abort ();
 184     }
 185 }
 186
 187 /* Return nonzero if we should ignore FMT, an RTL format, when making
 188    the list of formats we write routines to create.  */
 189
 190 static int
 191 special_format (fmt)
 192      const char *fmt;
 193 {
 194   return (strchr (fmt, '*') != 0
 195           || strchr (fmt, 'V') != 0
 196           || strchr (fmt, 'S') != 0
 197           || strchr (fmt, 'n') != 0);
 198 }
 199
 200 /* Return nonzero if the RTL code given by index IDX is one that we should not
 201    generate a gen_RTX_FOO function foo (because that function is present
 202    elsewhere in the compiler).  */
 203
 204 static int
 205 special_rtx (idx)
 206      int idx;
 207 {
 208   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 209           || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
 210           || strcmp (defs[idx].enumname, "REG") == 0
 211           || strcmp (defs[idx].enumname, "SUBREG") == 0
 212           || strcmp (defs[idx].enumname, "MEM") == 0);
 213 }
 214
 215 /* Place a list of all format specifiers we use into the array FORMAT. */
 216
 217 static void
 218 find_formats ()
 219 {
 220   int i;
 221
 222   for (i = 0; i < NUM_RTX_CODE; i++)
 223     {
 224       const char **f;
 225
 226       if (special_format (defs[i].format))
 227         continue;
 228
 229       for (f = formats; *f; f++)
 230         if (! strcmp (*f, defs[i].format))
 231           break;
 232
 233       if (*f == 0)
 234         *f = defs[i].format;
 235     }
 236 }
 237
 238 /* Write the declarations for the routine to allocate RTL with FORMAT.  */
 239
 240 static void
 241 gendecl (format)
 242      const char *format;
 243 {
 244   const char *p;
 245   int i, pos;
 246
 247   printf ("extern rtx gen_rtx_fmt_%s\tPARAMS ((RTX_CODE, ", format);
 248   printf ("enum machine_mode mode");
 249
 250   /* Write each parameter that is needed and start a new line when the line
 251      would overflow.  */
 252   for (p = format, i = 0, pos = 75; *p != 0; p++)
 253     if (*p != '0')
 254       {
 255         int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
 256
 257         printf (",");
 258         if (pos + ourlen > 76)
 259           printf ("\n\t\t\t\t      "), pos = 39;
 260
 261         printf (" %sarg%d", type_from_format (*p), i++);
 262         pos += ourlen;
 263       }
 264
 265   printf ("));\n");
 266 }
 267
 268 /* Generate macros to generate RTL of code IDX using the functions we
 269    write.  */
 270
 271 static void
 272 genmacro (idx)
 273      int idx;
 274 {
 275   const char *p;
 276   int i;
 277
 278   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 279      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 280
 281   printf ("#define gen_rtx_%s%s(MODE",
 282            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 283
 284   for (p = defs[idx].format, i = 0; *p != 0; p++)
 285     if (*p != '0')
 286       printf (", ARG%d", i++);
 287
 288   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 289           defs[idx].format, defs[idx].enumname);
 290
 291   for (p = defs[idx].format, i = 0; *p != 0; p++)
 292     if (*p != '0')
 293       printf (", (ARG%d)", i++);
 294
 295   puts (")");
 296 }
 297
 298 /* Generate the code for the function to generate RTL whose
 299    format is FORMAT.  */
 300
 301 static void
 302 gendef (format)
 303      const char *format;
 304 {
 305   const char *p;
 306   int i, j;
 307
 308   /* Start by writing the definition of the function name and the types
 309      of the arguments.  */
 310
 311   printf ("rtx\ngen_rtx_fmt_%s (code, mode", format);
 312   for (p = format, i = 0; *p != 0; p++)
 313     if (*p != '0')
 314       printf (", arg%d", i++);
 315
 316   puts (")\n     RTX_CODE code;\n     enum machine_mode mode;");
 317   for (p = format, i = 0; *p != 0; p++)
 318     if (*p != '0')
 319       printf ("     %sarg%d;\n", type_from_format (*p), i++);
 320
 321   /* Now write out the body of the function itself, which allocates
 322      the memory and initializes it.  */
 323   puts ("{");
 324   puts ("  rtx rt;");
 325   printf ("  rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
 326
 327   puts ("  memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
 328   puts ("  PUT_CODE (rt, code);");
 329   puts ("  PUT_MODE (rt, mode);");
 330
 331   for (p = format, i = j = 0; *p ; ++p, ++i)
 332     if (*p != '0')
 333       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 334     else
 335       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 336
 337   puts ("\n  return rt;\n}\n");
 338 }
 339
 340 /* Generate the documentation header for files we write.  */
 341
 342 static void
 343 genlegend ()
 344 {
 345   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 346 }
 347
 348 /* Generate the text of the header file we make, genrtl.h.  */
 349
 350 static void
 351 genheader ()
 352 {
 353   int i;
 354   const char **fmt;
 355
 356   puts ("#ifndef GCC_GENRTL_H");
 357   puts ("#define GCC_GENRTL_H\n");
 358
 359   for (fmt = formats; *fmt; ++fmt)
 360     gendecl (*fmt);
 361
 362   putchar ('\n');
 363
 364   for (i = 0; i < NUM_RTX_CODE; i++)
 365     if (! special_format (defs[i].format))
 366       genmacro (i);
 367
 368   puts ("\n#endif /* GCC_GENRTL_H */");
 369 }
 370
 371 /* Generate the text of the code file we write, genrtl.c.  */
 372
 373 static void
 374 gencode ()
 375 {
 376   const char **fmt;
 377
 378   puts ("#include \"config.h\"");
 379   puts ("#include \"system.h\"");
 380   puts ("#include \"obstack.h\"");
 381   puts ("#include \"rtl.h\"");
 382   puts ("#include \"ggc.h\"\n");
 383   puts ("extern struct obstack *rtl_obstack;\n");
 384   puts ("#define obstack_alloc_rtx(n)                                   \\");
 385   puts ("    ((rtx) obstack_alloc (rtl_obstack,                         \\");
 386   puts ("                         sizeof (struct rtx_def)               \\");
 387   puts ("                         + ((n) - 1) * sizeof (rtunion)))\n");
 388
 389   for (fmt = formats; *fmt != 0; fmt++)
 390     gendef (*fmt);
 391 }
 392
 393 #if defined(USE_C_ALLOCA)
 394 PTR
 395 xmalloc (nbytes)
 396   size_t nbytes;
 397 {
 398   register PTR tmp = (PTR) really_call_malloc (nbytes);
 399
 400   if (!tmp)
 401     {
 402       fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n",
 403                nbytes);
 404       exit (FATAL_EXIT_CODE);
 405     }
 406
 407   return tmp;
 408 }
 409 #endif /* USE_C_ALLOCA */
 410
 411 /* This is the main program.  We accept only one argument, "-h", which
 412    says we are writing the genrtl.h file.  Otherwise we are writing the
 413    genrtl.c file.  */
 414 extern int main PARAMS ((int, char **));
 415
 416 int
 417 main (argc, argv)
 418      int argc;
 419      char **argv;
 420 {
 421   find_formats ();
 422   genlegend ();
 423
 424   if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
 425     genheader ();
 426   else
 427     gencode ();
 428
 429   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 430     return FATAL_EXIT_CODE;
 431
 432   return SUCCESS_EXIT_CODE;
 433 }