gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997, 1998, 1999 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    We only need to go out to e0wwww, since min(HOST_WIDE_INT)==32 and
  34    max(LONG_DOUBLE_TYPE_SIZE)==128.
  35    This is duplicated in rtl.c.
  36    A number of places assume that there are always at least two 'w'
  37    slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
  38 #if HOST_BITS_PER_WIDE_INT >= LONG_DOUBLE_TYPE_SIZE
  39 #define CONST_DOUBLE_FORMAT     "e0ww"
  40 #elif HOST_BITS_PER_WIDE_INT*2 >= LONG_DOUBLE_TYPE_SIZE
  41 #define CONST_DOUBLE_FORMAT     "e0ww"
  42 #elif HOST_BITS_PER_WIDE_INT*3 >= LONG_DOUBLE_TYPE_SIZE
  43 #define CONST_DOUBLE_FORMAT     "e0www"
  44 #elif HOST_BITS_PER_WIDE_INT*4 >= LONG_DOUBLE_TYPE_SIZE
  45 #define CONST_DOUBLE_FORMAT     "e0wwww"
  46 #else
  47 #define CONST_DOUBLE_FORMAT     /* nothing - will cause syntax error */
  48 #endif
  49
  50
  51 struct rtx_definition
  52 {
  53   const char *enumname, *name, *format;
  54 };
  55
  56 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGIFY(ENUM), NAME, FORMAT },
  57
  58 struct rtx_definition defs[] =
  59 {
  60 #include "rtl.def"              /* rtl expressions are documented here */
  61 };
  62
  63 const char *formats[NUM_RTX_CODE];
  64
  65 static const char *type_from_format PROTO((int));
  66 static const char *accessor_from_format PROTO((int));
  67 static int special_format PROTO((const char *));
  68 static int special_rtx PROTO((int));
  69 static void find_formats PROTO((void));
  70 static void gendecl PROTO((FILE *, const char *));
  71 static void genmacro PROTO((FILE *, int));
  72 static void gendef PROTO((FILE *, const char *));
  73 static void genlegend PROTO((FILE *));
  74 static void genheader PROTO((FILE *));
  75 static void gencode PROTO((FILE *));
  76
  77 /* Decode a format letter into a C type string.  */
  78
  79 static const char *
  80 type_from_format (c)
  81      int c;
  82 {
  83   switch (c)
  84     {
  85     case 'i':
  86       return "int";
  87     case 'w':
  88       return "HOST_WIDE_INT";
  89     case 's':
  90       return "char *";
  91     case 'e':
  92     case 'u':
  93       return "rtx";
  94     case 'E':
  95       return "rtvec";
  96     case 'b':
  97       return "struct bitmap_head_def *";  /* bitmap - typedef not available */
  98     case 't':
  99       return "union tree_node *";  /* tree - typedef not available */
 100     default:
 101       abort ();
 102     }
 103 }
 104
 105 /* Decode a format letter into the proper accessor function.  */
 106
 107 static const char *
 108 accessor_from_format (c)
 109      int c;
 110 {
 111   switch (c)
 112     {
 113     case 'i':
 114       return "XINT";
 115     case 'w':
 116       return "XWINT";
 117     case 's':
 118       return "XSTR";
 119     case 'e':
 120     case 'u':
 121       return "XEXP";
 122     case 'E':
 123       return "XVEC";
 124     case 'b':
 125       return "XBITMAP";
 126     case 't':
 127       return "XTREE";
 128     default:
 129       abort ();
 130     }
 131 }
 132
 133 /* Return true if a format character doesn't need normal processing.  */
 134
 135 static int
 136 special_format (fmt)
 137      const char *fmt;
 138 {
 139   return (strchr (fmt, '*') != 0
 140           || strchr (fmt, 'V') != 0
 141           || strchr (fmt, 'S') != 0
 142           || strchr (fmt, 'n') != 0);
 143 }
 144
 145 /* Return true if an rtx requires special processing.  */
 146
 147 static int
 148 special_rtx (idx)
 149      int idx;
 150 {
 151   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 152           || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
 153           || strcmp (defs[idx].enumname, "REG") == 0
 154           || strcmp (defs[idx].enumname, "MEM") == 0);
 155 }
 156
 157 /* Fill `formats' with all unique format strings.  */
 158
 159 static void
 160 find_formats ()
 161 {
 162   int i;
 163
 164   for (i = 0; i < NUM_RTX_CODE; ++i)
 165     {
 166       const char **f;
 167
 168       if (special_format (defs[i].format))
 169         continue;
 170
 171       for (f = formats; *f ; ++f)
 172         if (! strcmp (*f, defs[i].format))
 173           break;
 174
 175       if (!*f)
 176         *f = defs[i].format;
 177     }
 178 }
 179
 180 /* Emit a prototype for the rtx generator for a format.  */
 181
 182 static void
 183 gendecl (f, format)
 184      FILE *f;
 185      const char *format;
 186 {
 187   const char *p;
 188   int i;
 189
 190   fprintf (f, "extern rtx gen_rtx_fmt_%s PROTO((RTX_CODE, enum machine_mode mode",
 191            format);
 192   for (p = format, i = 0; *p ; ++p)
 193     if (*p != '0')
 194       fprintf (f, ", %s arg%d", type_from_format (*p), i++);
 195   fprintf (f, "));\n");
 196 }
 197
 198 /* Emit a define mapping an rtx code to the generator for its format.  */
 199
 200 static void
 201 genmacro (f, idx)
 202      FILE *f;
 203      int idx;
 204 {
 205   const char *p;
 206   int i;
 207
 208   fprintf (f, "#define gen_rtx_%s%s(mode",
 209            (special_rtx (idx) ? "raw_" : ""), defs[idx].enumname);
 210
 211   for (p = defs[idx].format, i = 0; *p ; ++p)
 212     if (*p != '0')
 213       fprintf (f, ", arg%d", i++);
 214   fprintf (f, ")   ");
 215
 216   fprintf (f, "gen_rtx_fmt_%s(%s,(mode)", defs[idx].format, defs[idx].enumname);
 217   for (p = defs[idx].format, i = 0; *p ; ++p)
 218     if (*p != '0')
 219       fprintf (f, ",(arg%d)", i++);
 220   fprintf (f, ")\n");
 221 }
 222
 223 /* Emit the implementation for the rtx generator for a format.  */
 224
 225 static void
 226 gendef (f, format)
 227      FILE *f;
 228      const char *format;
 229 {
 230   const char *p;
 231   int i, j;
 232
 233   fprintf (f, "rtx\ngen_rtx_fmt_%s (code, mode", format);
 234   for (p = format, i = 0; *p ; ++p)
 235     if (*p != '0')
 236       fprintf (f, ", arg%d", i++);
 237
 238   fprintf (f, ")\n     RTX_CODE code;\n     enum machine_mode mode;\n");
 239   for (p = format, i = 0; *p ; ++p)
 240     if (*p != '0')
 241       fprintf (f, "     %s arg%d;\n", type_from_format (*p), i++);
 242
 243   /* See rtx_alloc in rtl.c for comments.  */
 244   fprintf (f, "{\n");
 245   fprintf (f, "  rtx rt = obstack_alloc_rtx (sizeof (struct rtx_def) + %d * sizeof (rtunion));\n",
 246            (int) strlen (format) - 1);
 247
 248   fprintf (f, "  PUT_CODE (rt, code);\n");
 249   fprintf (f, "  PUT_MODE (rt, mode);\n");
 250
 251   for (p = format, i = j = 0; *p ; ++p, ++i)
 252     if (*p != '0')
 253       {
 254         fprintf (f, "  %s (rt, %d) = arg%d;\n",
 255                  accessor_from_format (*p), i, j++);
 256       }
 257
 258   fprintf (f, "\n  return rt;\n}\n\n");
 259 }
 260
 261 /* Emit the `do not edit' banner.  */
 262
 263 static void
 264 genlegend (f)
 265      FILE *f;
 266 {
 267   fputs ("/* Generated automaticaly by the program `gengenrtl'\n", f);
 268   fputs ("   from the RTL description file `rtl.def' */\n\n", f);
 269 }
 270
 271 /* Emit "genrtl.h".  */
 272
 273 static void
 274 genheader (f)
 275      FILE *f;
 276 {
 277   int i;
 278   const char **fmt;
 279
 280   for (fmt = formats; *fmt; ++fmt)
 281     gendecl (f, *fmt);
 282
 283   fprintf (f, "\n");
 284
 285   for (i = 0; i < NUM_RTX_CODE; i++)
 286     {
 287       if (special_format (defs[i].format))
 288         continue;
 289       genmacro (f, i);
 290     }
 291 }
 292
 293 /* Emit "genrtl.c".  */
 294
 295 static void
 296 gencode (f)
 297      FILE *f;
 298 {
 299   const char **fmt;
 300
 301   fputs ("#include \"config.h\"\n", f);
 302   fputs ("#include \"system.h\"\n", f);
 303   fputs ("#include \"obstack.h\"\n", f);
 304   fputs ("#include \"rtl.h\"\n\n", f);
 305   fputs ("extern struct obstack *rtl_obstack;\n\n", f);
 306   fputs ("static rtx obstack_alloc_rtx PROTO((int length));\n", f);
 307   fputs ("static rtx obstack_alloc_rtx (length)\n", f);
 308   fputs ("     register int length;\n{\n", f);
 309   fputs ("  rtx rt = (rtx) obstack_alloc (rtl_obstack, length);\n\n", f);
 310   fputs ("  memset(rt, 0, sizeof(struct rtx_def) - sizeof(rtunion));\n\n", f);
 311   fputs ("  return rt;\n}\n\n", f);
 312
 313   for (fmt = formats; *fmt; ++fmt)
 314     gendef (f, *fmt);
 315 }
 316
 317 #if defined(USE_C_ALLOCA)
 318 PTR
 319 xmalloc (nbytes)
 320   size_t nbytes;
 321 {
 322   register PTR tmp = (PTR) malloc (nbytes);
 323
 324   if (!tmp)
 325     {
 326       fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n",
 327                nbytes);
 328       exit (FATAL_EXIT_CODE);
 329     }
 330
 331   return tmp;
 332 }
 333 #endif /* USE_C_ALLOCA */
 334
 335 int
 336 main(argc, argv)
 337      int argc;
 338      char **argv;
 339 {
 340   FILE *f;
 341
 342   if (argc != 3)
 343     exit (1);
 344
 345   find_formats ();
 346
 347   f = fopen (argv[1], "w");
 348   if (f == NULL)
 349     {
 350       perror (argv[1]);
 351       exit (1);
 352     }
 353   genlegend (f);
 354   genheader (f);
 355   fclose (f);
 356
 357   f = fopen (argv[2], "w");
 358   if (f == NULL)
 359     {
 360       perror (argv[2]);
 361       exit (1);
 362     }
 363   genlegend (f);
 364   gencode (f);
 365   fclose (f);
 366
 367   exit (0);
 368 }