gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997 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 #include "obstack.h"
  26 #define obstack_chunk_alloc     xmalloc
  27 #define obstack_chunk_free      free
  28
  29 #define NO_GENRTL_H
  30 #include "rtl.h"
  31
  32
  33 struct rtx_definition
  34 {
  35   const char *enumname, *name, *format;
  36 };
  37
  38 #if defined(HAVE_CPP_STRINGIFY) || (defined(__GNUC__) && defined(__STDC__))
  39 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { # ENUM, NAME, FORMAT },
  40 #else
  41 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { "ENUM", NAME, FORMAT },
  42 #endif
  43
  44 struct rtx_definition defs[] =
  45 {
  46 #include "rtl.def"              /* rtl expressions are documented here */
  47 };
  48
  49 const char *formats[NUM_RTX_CODE];
  50
  51 static const char *
  52 type_from_format (c)
  53      char c;
  54 {
  55   switch (c)
  56     {
  57     case 'i':
  58       return "int";
  59     case 'w':
  60       return "HOST_WIDE_INT";
  61     case 's':
  62       return "char *";
  63     case 'e':
  64     case 'u':
  65       return "rtx";
  66     case 'E':
  67       return "rtvec";
  68     default:
  69       abort ();
  70     }
  71 }
  72
  73 static const char *
  74 accessor_from_format (c)
  75      char c;
  76 {
  77   switch (c)
  78     {
  79     case 'i':
  80       return "XINT";
  81     case 'w':
  82       return "XWINT";
  83     case 's':
  84       return "XSTR";
  85     case 'e':
  86     case 'u':
  87       return "XEXP";
  88     case 'E':
  89       return "XVEC";
  90     default:
  91       abort ();
  92     }
  93 }
  94
  95 static int
  96 special_format (fmt)
  97      const char *fmt;
  98 {
  99   return (strchr (fmt, '*') != 0
 100           || strchr (fmt, 'V') != 0
 101           || strchr (fmt, 'S') != 0
 102           || strchr (fmt, 'n') != 0);
 103 }
 104
 105 static int
 106 special_rtx (idx)
 107      int idx;
 108 {
 109   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 110           || strcmp (defs[idx].enumname, "REG") == 0);
 111 }
 112
 113 static void
 114 find_formats ()
 115 {
 116   int i;
 117
 118   for (i = 0; i < NUM_RTX_CODE; ++i)
 119     {
 120       const char **f;
 121
 122       if (special_format (defs[i].format))
 123         continue;
 124
 125       for (f = formats; *f ; ++f)
 126         if (!strcmp(*f, defs[i].format))
 127           break;
 128
 129       if (!*f)
 130         *f = defs[i].format;
 131     }
 132 }
 133
 134 static void
 135 gendecl (f, format)
 136      FILE *f;
 137      const char *format;
 138 {
 139   const char *p;
 140   int i;
 141
 142   fprintf (f, "extern rtx gen_rtx_fmt_%s PROTO((RTX_CODE, enum machine_mode mode",
 143            format);
 144   for (p = format, i = 0; *p ; ++p)
 145     if (*p != '0')
 146       fprintf (f, ", %s arg%d", type_from_format (*p), i++);
 147   fprintf (f, "));\n");
 148 }
 149
 150 static void
 151 genmacro (f, idx)
 152      FILE *f;
 153      int idx;
 154 {
 155   const char *p;
 156   int i;
 157
 158   fprintf (f, "#define gen_rtx_%s%s(mode",
 159            (special_rtx (idx) ? "raw_" : ""), defs[idx].enumname);
 160
 161   for (p = defs[idx].format, i = 0; *p ; ++p)
 162     if (*p != '0')
 163       fprintf (f, ", arg%d", i++);
 164   fprintf (f, ")   ");
 165
 166   fprintf (f, "gen_rtx_fmt_%s(%s,(mode)", defs[idx].format, defs[idx].enumname);
 167   for (p = defs[idx].format, i = 0; *p ; ++p)
 168     if (*p != '0')
 169       fprintf (f, ",(arg%d)", i++);
 170   fprintf (f, ")\n");
 171 }
 172
 173 static void
 174 gendef (f, format)
 175      FILE *f;
 176      const char *format;
 177 {
 178   const char *p;
 179   int i, j;
 180
 181   fprintf (f, "rtx\ngen_rtx_fmt_%s (code, mode", format);
 182   for (p = format, i = 0; *p ; ++p)
 183     if (*p != '0')
 184       fprintf (f, ", arg%d", i++);
 185
 186   fprintf (f, ")\n     RTX_CODE code;\n     enum machine_mode mode;\n");
 187   for (p = format, i = 0; *p ; ++p)
 188     if (*p != '0')
 189       fprintf (f, "     %s arg%d;\n", type_from_format (*p), i++);
 190
 191   /* See rtx_alloc in rtl.c for comments.  */
 192   fprintf (f, "{\n");
 193   fprintf (f, "  rtx rt = obstack_alloc_rtx (sizeof (struct rtx_def) + %d * sizeof (rtunion));\n",
 194            (int) strlen (format) - 1);
 195
 196   fprintf (f, "  PUT_CODE (rt, code);\n");
 197   fprintf (f, "  PUT_MODE (rt, mode);\n");
 198
 199   for (p = format, i = j = 0; *p ; ++p, ++i)
 200     if (*p != '0')
 201       {
 202         fprintf (f, "  %s (rt, %d) = arg%d;\n",
 203                  accessor_from_format (*p), i, j++);
 204       }
 205
 206   fprintf (f, "\n  return rt;\n}\n\n");
 207 }
 208
 209 static void
 210 genlegend (f)
 211      FILE *f;
 212 {
 213   fprintf (f, "/* Generated automaticaly by the program `gengenrtl'\n");
 214   fprintf (f, "   from the RTL description file `rtl.def' */\n\n");
 215 }
 216
 217 static void
 218 genheader (f)
 219      FILE *f;
 220 {
 221   int i;
 222   const char **fmt;
 223
 224   for (fmt = formats; *fmt; ++fmt)
 225     gendecl (f, *fmt);
 226
 227   fprintf(f, "\n");
 228
 229   for (i = 0; i < NUM_RTX_CODE; i++)
 230     {
 231       if (special_format (defs[i].format))
 232         continue;
 233       genmacro (f, i);
 234     }
 235 }
 236
 237 static void
 238 gencode (f)
 239      FILE *f;
 240 {
 241   const char **fmt;
 242
 243   fputs ("#include \"config.h\"\n", f);
 244   fputs ("#include \"obstack.h\"\n", f);
 245   fputs ("#include \"rtl.h\"\n\n", f);
 246   fputs ("extern struct obstack *rtl_obstack;\n\n", f);
 247   fputs ("static rtx obstack_alloc_rtx PROTO((int length));\n", f);
 248   fputs ("static rtx obstack_alloc_rtx (length)\n", f);
 249   fputs ("     register int length;\n{\n", f);
 250   fputs ("  rtx rt = (rtx) obstack_alloc (rtl_obstack, length);\n\n", f);
 251   fputs ("  if (sizeof(struct rtx_def) - sizeof(rtunion) == sizeof(int))\n", f);
 252   fputs ("    *(int *)rt = 0;\n", f);
 253   fputs ("  else if (sizeof(struct rtx_def) - sizeof(rtunion) == sizeof(HOST_WIDE_INT))\n", f);
 254   fputs ("    *(HOST_WIDE_INT *)rt = 0;\n", f);
 255   fputs ("  else\n", f);
 256   fputs ("    bzero(rt, sizeof(struct rtx_def) - sizeof(rtunion));\n\n", f);
 257   fputs ("  return rt;\n}\n\n", f);
 258
 259   for (fmt = formats; *fmt; ++fmt)
 260     gendef (f, *fmt);
 261 }
 262
 263 #if defined(USE_C_ALLOCA) && !defined(__GNUC__)
 264 char *
 265 xmalloc (nbytes)
 266      int nbytes;
 267 {
 268   char *tmp = (char *) malloc (nbytes);
 269
 270   if (!tmp)
 271     {
 272       fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n", nbytes);
 273       exit (FATAL_EXIT_CODE);
 274     }
 275
 276   return tmp;
 277 }
 278 #endif /* USE_C_ALLOCA && !__GNUC__ */
 279
 280 int
 281 main(argc, argv)
 282      int argc;
 283      char **argv;
 284 {
 285   FILE *f;
 286
 287   if (argc != 3)
 288     exit (1);
 289
 290   find_formats ();
 291
 292   f = fopen (argv[1], "w");
 293   if (f == NULL)
 294     {
 295       perror(argv[1]);
 296       exit (1);
 297     }
 298   genlegend (f);
 299   genheader (f);
 300   fclose(f);
 301
 302   f = fopen (argv[2], "w");
 303   if (f == NULL)
 304     {
 305       perror(argv[2]);
 306       exit (1);
 307     }
 308   genlegend (f);
 309   gencode (f);
 310   fclose(f);
 311
 312   exit (0);
 313 }