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 <stdio.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) { # 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 *
  48 type_from_format (char c)
  49 {
  50   switch (c)
  51     {
  52     case 'i':
  53       return "int";
  54     case 'w':
  55       return "HOST_WIDE_INT";
  56     case 's':
  57       return "char *";
  58     case 'e':
  59     case 'u':
  60       return "rtx";
  61     case 'E':
  62       return "rtvec";
  63     default:
  64       abort ();
  65     }
  66 }
  67
  68 static const char *
  69 accessor_from_format (char c)
  70 {
  71   switch (c)
  72     {
  73     case 'i':
  74       return "XINT";
  75     case 'w':
  76       return "XWINT";
  77     case 's':
  78       return "XSTR";
  79     case 'e':
  80     case 'u':
  81       return "XEXP";
  82     case 'E':
  83       return "XVEC";
  84     default:
  85       abort ();
  86     }
  87 }
  88
  89 static int
  90 special_format (fmt)
  91      const char *fmt;
  92 {
  93   return (strchr (fmt, '*') != 0
  94           || strchr (fmt, 'V') != 0
  95           || strchr (fmt, 'S') != 0
  96           || strchr (fmt, 'n') != 0);
  97 }
  98
  99 static int
 100 special_rtx (idx)
 101      int idx;
 102 {
 103   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 104           || strcmp (defs[idx].enumname, "REG") == 0);
 105 }
 106
 107 static void
 108 find_formats ()
 109 {
 110   int i;
 111
 112   for (i = 0; i < NUM_RTX_CODE; ++i)
 113     {
 114       const char **f;
 115
 116       if (special_format (defs[i].format))
 117         continue;
 118
 119       for (f = formats; *f ; ++f)
 120         if (!strcmp(*f, defs[i].format))
 121           break;
 122
 123       if (!*f)
 124         *f = defs[i].format;
 125     }
 126 }
 127
 128 static void
 129 gendecl (f, format)
 130      FILE *f;
 131      const char *format;
 132 {
 133   const char *p;
 134   int i;
 135
 136   fprintf (f, "extern rtx gen_rtx_fmt_%s PROTO((RTX_CODE, enum machine_mode mode",
 137            format);
 138   for (p = format, i = 0; *p ; ++p)
 139     if (*p != '0')
 140       fprintf (f, ", %s arg%d", type_from_format (*p), i++);
 141   fprintf (f, "));\n");
 142 }
 143
 144 static void
 145 genmacro (f, idx)
 146      FILE *f;
 147      int idx;
 148 {
 149   const char *p;
 150   int i;
 151
 152   fprintf (f, "#define gen_rtx_%s%s(mode",
 153            (special_rtx (idx) ? "raw_" : ""), defs[idx].enumname);
 154
 155   for (p = defs[idx].format, i = 0; *p ; ++p)
 156     if (*p != '0')
 157       fprintf (f, ", arg%d", i++);
 158   fprintf (f, ")   ");
 159
 160   fprintf (f, "gen_rtx_fmt_%s(%s,(mode)", defs[idx].format, defs[idx].enumname);
 161   for (p = defs[idx].format, i = 0; *p ; ++p)
 162     if (*p != '0')
 163       fprintf (f, ",(arg%d)", i++);
 164   fprintf (f, ")\n");
 165 }
 166
 167 static void
 168 gendef (f, format)
 169      FILE *f;
 170      const char *format;
 171 {
 172   const char *p;
 173   int i, j;
 174
 175   fprintf (f, "rtx\ngen_rtx_fmt_%s (code, mode", format);
 176   for (p = format, i = 0; *p ; ++p)
 177     if (*p != '0')
 178       fprintf (f, ", arg%d", i++);
 179
 180   fprintf (f, ")\n     RTX_CODE code;\n     enum machine_mode mode;\n");
 181   for (p = format, i = 0; *p ; ++p)
 182     if (*p != '0')
 183       fprintf (f, "     %s arg%d;\n", type_from_format (*p), i++);
 184
 185   /* See rtx_alloc in rtl.c for comments.  */
 186   fprintf (f, "{\n");
 187   fprintf (f, "  rtx rt = obstack_alloc_rtx (sizeof (struct rtx_def) + %d * sizeof (rtunion));\n",
 188            (int) strlen (format) - 1);
 189
 190   fprintf (f, "  PUT_CODE (rt, code);\n");
 191   fprintf (f, "  PUT_MODE (rt, mode);\n");
 192
 193   for (p = format, i = j = 0; *p ; ++p, ++i)
 194     if (*p != '0')
 195       {
 196         fprintf (f, "  %s (rt, %d) = arg%d;\n",
 197                  accessor_from_format (*p), i, j++);
 198       }
 199
 200   fprintf (f, "\n  return rt;\n}\n\n");
 201 }
 202
 203 static void
 204 genlegend (f)
 205      FILE *f;
 206 {
 207   fprintf (f, "/* Generated automaticaly by the program `gengenrtl'\n");
 208   fprintf (f, "   from the RTL description file `rtl.def' */\n\n");
 209 }
 210
 211 static void
 212 genheader (f)
 213      FILE *f;
 214 {
 215   int i;
 216   const char **fmt;
 217
 218   for (fmt = formats; *fmt; ++fmt)
 219     gendecl (f, *fmt);
 220
 221   fprintf(f, "\n");
 222
 223   for (i = 0; i < NUM_RTX_CODE; i++)
 224     {
 225       if (special_format (defs[i].format))
 226         continue;
 227       genmacro (f, i);
 228     }
 229 }
 230
 231 static void
 232 gencode (f)
 233      FILE *f;
 234 {
 235   const char **fmt;
 236
 237   fputs ("#include \"config.h\"\n", f);
 238   fputs ("#include \"obstack.h\"\n", f);
 239   fputs ("#include \"rtl.h\"\n\n", f);
 240   fputs ("extern struct obstack *rtl_obstack;\n\n", f);
 241   fputs ("static rtx obstack_alloc_rtx PROTO((int length));\n", f);
 242   fputs ("static rtx obstack_alloc_rtx (length)\n", f);
 243   fputs ("     register int length;\n{\n", f);
 244   fputs ("  rtx rt = (rtx) obstack_alloc (rtl_obstack, length);\n\n", f);
 245   fputs ("  if (sizeof(struct rtx_def) - sizeof(rtunion) == sizeof(int))\n", f);
 246   fputs ("    *(int *)rt = 0;\n", f);
 247   fputs ("  else if (sizeof(struct rtx_def) - sizeof(rtunion) == sizeof(HOST_WIDE_INT))\n", f);
 248   fputs ("    *(HOST_WIDE_INT *)rt = 0;\n", f);
 249   fputs ("  else\n", f);
 250   fputs ("    bzero(rt, sizeof(struct rtx_def) - sizeof(rtunion));\n\n", f);
 251   fputs ("  return rt;\n}\n\n", f);
 252
 253   for (fmt = formats; *fmt; ++fmt)
 254     gendef (f, *fmt);
 255 }
 256
 257 int
 258 main(argc, argv)
 259      int argc;
 260      char **argv;
 261 {
 262   FILE *f;
 263
 264   if (argc != 3)
 265     exit (1);
 266
 267   find_formats ();
 268
 269   f = fopen (argv[1], "w");
 270   if (f == NULL)
 271     {
 272       perror(argv[1]);
 273       exit (1);
 274     }
 275   genlegend (f);
 276   genheader (f);
 277   fclose(f);
 278
 279   f = fopen (argv[2], "w");
 280   if (f == NULL)
 281     {
 282       perror(argv[2]);
 283       exit (1);
 284     }
 285   genlegend (f);
 286   gencode (f);
 287   fclose(f);
 288
 289   exit (0);
 290 }