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 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGIFY(ENUM), NAME, FORMAT },
  39
  40 struct rtx_definition defs[] =
  41 {
  42 #include "rtl.def"              /* rtl expressions are documented here */
  43 };
  44
  45 const char *formats[NUM_RTX_CODE];
  46
  47 static const char *type_from_format PROTO((char));
  48 static const char *accessor_from_format PROTO((char));
  49 static int special_format PROTO((const char *));
  50 static int special_rtx PROTO((int));
  51 static void find_formats PROTO((void));
  52 static void gendecl PROTO((FILE *, const char *));
  53 static void genmacro PROTO((FILE *, int));
  54 static void gendef PROTO((FILE *, const char *));
  55 static void genlegend PROTO((FILE *));
  56 static void genheader PROTO((FILE *));
  57 static void gencode PROTO((FILE *));
  58
  59 static const char *
  60 type_from_format (c)
  61      char c;
  62 {
  63   switch (c)
  64     {
  65     case 'i':
  66       return "int";
  67     case 'w':
  68       return "HOST_WIDE_INT";
  69     case 's':
  70       return "char *";
  71     case 'e':
  72     case 'u':
  73       return "rtx";
  74     case 'E':
  75       return "rtvec";
  76     default:
  77       abort ();
  78     }
  79 }
  80
  81 static const char *
  82 accessor_from_format (c)
  83      char c;
  84 {
  85   switch (c)
  86     {
  87     case 'i':
  88       return "XINT";
  89     case 'w':
  90       return "XWINT";
  91     case 's':
  92       return "XSTR";
  93     case 'e':
  94     case 'u':
  95       return "XEXP";
  96     case 'E':
  97       return "XVEC";
  98     default:
  99       abort ();
 100     }
 101 }
 102
 103 static int
 104 special_format (fmt)
 105      const char *fmt;
 106 {
 107   return (strchr (fmt, '*') != 0
 108           || strchr (fmt, 'V') != 0
 109           || strchr (fmt, 'S') != 0
 110           || strchr (fmt, 'n') != 0);
 111 }
 112
 113 static int
 114 special_rtx (idx)
 115      int idx;
 116 {
 117   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 118           || strcmp (defs[idx].enumname, "REG") == 0);
 119 }
 120
 121 static void
 122 find_formats ()
 123 {
 124   int i;
 125
 126   for (i = 0; i < NUM_RTX_CODE; ++i)
 127     {
 128       const char **f;
 129
 130       if (special_format (defs[i].format))
 131         continue;
 132
 133       for (f = formats; *f ; ++f)
 134         if (!strcmp(*f, defs[i].format))
 135           break;
 136
 137       if (!*f)
 138         *f = defs[i].format;
 139     }
 140 }
 141
 142 static void
 143 gendecl (f, format)
 144      FILE *f;
 145      const char *format;
 146 {
 147   const char *p;
 148   int i;
 149
 150   fprintf (f, "extern rtx gen_rtx_fmt_%s PROTO((RTX_CODE, enum machine_mode mode",
 151            format);
 152   for (p = format, i = 0; *p ; ++p)
 153     if (*p != '0')
 154       fprintf (f, ", %s arg%d", type_from_format (*p), i++);
 155   fprintf (f, "));\n");
 156 }
 157
 158 static void
 159 genmacro (f, idx)
 160      FILE *f;
 161      int idx;
 162 {
 163   const char *p;
 164   int i;
 165
 166   fprintf (f, "#define gen_rtx_%s%s(mode",
 167            (special_rtx (idx) ? "raw_" : ""), defs[idx].enumname);
 168
 169   for (p = defs[idx].format, i = 0; *p ; ++p)
 170     if (*p != '0')
 171       fprintf (f, ", arg%d", i++);
 172   fprintf (f, ")   ");
 173
 174   fprintf (f, "gen_rtx_fmt_%s(%s,(mode)", defs[idx].format, defs[idx].enumname);
 175   for (p = defs[idx].format, i = 0; *p ; ++p)
 176     if (*p != '0')
 177       fprintf (f, ",(arg%d)", i++);
 178   fprintf (f, ")\n");
 179 }
 180
 181 static void
 182 gendef (f, format)
 183      FILE *f;
 184      const char *format;
 185 {
 186   const char *p;
 187   int i, j;
 188
 189   fprintf (f, "rtx\ngen_rtx_fmt_%s (code, mode", format);
 190   for (p = format, i = 0; *p ; ++p)
 191     if (*p != '0')
 192       fprintf (f, ", arg%d", i++);
 193
 194   fprintf (f, ")\n     RTX_CODE code;\n     enum machine_mode mode;\n");
 195   for (p = format, i = 0; *p ; ++p)
 196     if (*p != '0')
 197       fprintf (f, "     %s arg%d;\n", type_from_format (*p), i++);
 198
 199   /* See rtx_alloc in rtl.c for comments.  */
 200   fprintf (f, "{\n");
 201   fprintf (f, "  rtx rt = obstack_alloc_rtx (sizeof (struct rtx_def) + %d * sizeof (rtunion));\n",
 202            (int) strlen (format) - 1);
 203
 204   fprintf (f, "  PUT_CODE (rt, code);\n");
 205   fprintf (f, "  PUT_MODE (rt, mode);\n");
 206
 207   for (p = format, i = j = 0; *p ; ++p, ++i)
 208     if (*p != '0')
 209       {
 210         fprintf (f, "  %s (rt, %d) = arg%d;\n",
 211                  accessor_from_format (*p), i, j++);
 212       }
 213
 214   fprintf (f, "\n  return rt;\n}\n\n");
 215 }
 216
 217 static void
 218 genlegend (f)
 219      FILE *f;
 220 {
 221   fprintf (f, "/* Generated automaticaly by the program `gengenrtl'\n");
 222   fprintf (f, "   from the RTL description file `rtl.def' */\n\n");
 223 }
 224
 225 static void
 226 genheader (f)
 227      FILE *f;
 228 {
 229   int i;
 230   const char **fmt;
 231
 232   for (fmt = formats; *fmt; ++fmt)
 233     gendecl (f, *fmt);
 234
 235   fprintf(f, "\n");
 236
 237   for (i = 0; i < NUM_RTX_CODE; i++)
 238     {
 239       if (special_format (defs[i].format))
 240         continue;
 241       genmacro (f, i);
 242     }
 243 }
 244
 245 static void
 246 gencode (f)
 247      FILE *f;
 248 {
 249   const char **fmt;
 250
 251   fputs ("#include \"config.h\"\n", f);
 252   fputs ("#include \"system.h\"\n", f);
 253   fputs ("#include \"obstack.h\"\n", f);
 254   fputs ("#include \"rtl.h\"\n\n", f);
 255   fputs ("extern struct obstack *rtl_obstack;\n\n", f);
 256   fputs ("static rtx obstack_alloc_rtx PROTO((int length));\n", f);
 257   fputs ("static rtx obstack_alloc_rtx (length)\n", f);
 258   fputs ("     register int length;\n{\n", f);
 259   fputs ("  rtx rt = (rtx) obstack_alloc (rtl_obstack, length);\n\n", f);
 260   fputs ("  if (sizeof(struct rtx_def) - sizeof(rtunion) == sizeof(int))\n", f);
 261   fputs ("    *(int *)rt = 0;\n", f);
 262   fputs ("  else if (sizeof(struct rtx_def) - sizeof(rtunion) == sizeof(HOST_WIDE_INT))\n", f);
 263   fputs ("    *(HOST_WIDE_INT *)rt = 0;\n", f);
 264   fputs ("  else\n", f);
 265   fputs ("    bzero((char *) rt, sizeof(struct rtx_def) - sizeof(rtunion));\n\n", f);
 266   fputs ("  return rt;\n}\n\n", f);
 267
 268   for (fmt = formats; *fmt; ++fmt)
 269     gendef (f, *fmt);
 270 }
 271
 272 #if defined(USE_C_ALLOCA) && !defined(__GNUC__)
 273 char *
 274 xmalloc (nbytes)
 275      int nbytes;
 276 {
 277   char *tmp = (char *) malloc (nbytes);
 278
 279   if (!tmp)
 280     {
 281       fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n", nbytes);
 282       exit (FATAL_EXIT_CODE);
 283     }
 284
 285   return tmp;
 286 }
 287 #endif /* USE_C_ALLOCA && !__GNUC__ */
 288
 289 int
 290 main(argc, argv)
 291      int argc;
 292      char **argv;
 293 {
 294   FILE *f;
 295
 296   if (argc != 3)
 297     exit (1);
 298
 299   find_formats ();
 300
 301   f = fopen (argv[1], "w");
 302   if (f == NULL)
 303     {
 304       perror(argv[1]);
 305       exit (1);
 306     }
 307   genlegend (f);
 308   genheader (f);
 309   fclose(f);
 310
 311   f = fopen (argv[2], "w");
 312   if (f == NULL)
 313     {
 314       perror(argv[2]);
 315       exit (1);
 316     }
 317   genlegend (f);
 318   gencode (f);
 319   fclose(f);
 320
 321   exit (0);
 322 }