gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22
  23 #include "bconfig.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27
  28 #define NO_GENRTL_H
  29 #include "rtl.h"
  30 #undef abort
  31
  32 #include "real.h"
  33
  34 struct rtx_definition
  35 {
  36   const char *const enumname, *const name, *const format;
  37 };
  38
  39 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT },
  40
  41 static const struct rtx_definition defs[] =
  42 {
  43 #include "rtl.def"              /* rtl expressions are documented here */
  44 };
  45
  46 static const char *formats[NUM_RTX_CODE];
  47
  48 static const char *type_from_format     (int);
  49 static const char *accessor_from_format (int);
  50 static int special_format               (const char *);
  51 static int special_rtx                  (int);
  52 static int excluded_rtx                 (int);
  53 static void find_formats                (void);
  54 static void gendecl                     (const char *);
  55 static void genmacro                    (int);
  56 static void gendef                      (const char *);
  57 static void genlegend                   (void);
  58 static void genheader                   (void);
  59 static void gencode                     (void);
  60 \f
  61 /* Decode a format letter into a C type string.  */
  62
  63 static const char *
  64 type_from_format (int c)
  65 {
  66   switch (c)
  67     {
  68     case 'i':
  69       return "int ";
  70
  71     case 'w':
  72       return "HOST_WIDE_INT ";
  73
  74     case 's':
  75       return "const char *";
  76
  77     case 'e':  case 'u':
  78       return "rtx ";
  79
  80     case 'E':
  81       return "rtvec ";
  82     case 'b':
  83       return "struct bitmap_head_def *";  /* bitmap - typedef not available */
  84     case 't':
  85       return "union tree_node *";  /* tree - typedef not available */
  86     case 'B':
  87       return "struct basic_block_def *";  /* basic block - typedef not available */
  88     default:
  89       abort ();
  90     }
  91 }
  92
  93 /* Decode a format letter into the proper accessor function.  */
  94
  95 static const char *
  96 accessor_from_format (int c)
  97 {
  98   switch (c)
  99     {
 100     case 'i':
 101       return "XINT";
 102
 103     case 'w':
 104       return "XWINT";
 105
 106     case 's':
 107       return "XSTR";
 108
 109     case 'e':  case 'u':
 110       return "XEXP";
 111
 112     case 'E':
 113       return "XVEC";
 114
 115     case 'b':
 116       return "XBITMAP";
 117
 118     case 't':
 119       return "XTREE";
 120
 121     case 'B':
 122       return "XBBDEF";
 123
 124     default:
 125       abort ();
 126     }
 127 }
 128
 129 /* Return nonzero if we should ignore FMT, an RTL format, when making
 130    the list of formats we write routines to create.  */
 131
 132 static int
 133 special_format (const char *fmt)
 134 {
 135   return (strchr (fmt, '*') != 0
 136           || strchr (fmt, 'V') != 0
 137           || strchr (fmt, 'S') != 0
 138           || strchr (fmt, 'n') != 0);
 139 }
 140
 141 /* Return nonzero if the RTL code given by index IDX is one that we should
 142    generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
 143    is a wrapper in emit-rtl.c).  */
 144
 145 static int
 146 special_rtx (int idx)
 147 {
 148   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 149           || strcmp (defs[idx].enumname, "REG") == 0
 150           || strcmp (defs[idx].enumname, "SUBREG") == 0
 151           || strcmp (defs[idx].enumname, "MEM") == 0
 152           || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
 153 }
 154
 155 /* Return nonzero if the RTL code given by index IDX is one that we should
 156    generate no macro for at all (because gen_rtx_FOO is never used or
 157    cannot have the obvious interface).  */
 158
 159 static int
 160 excluded_rtx (int idx)
 161 {
 162   return (strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0);
 163 }
 164
 165 /* Place a list of all format specifiers we use into the array FORMAT.  */
 166
 167 static void
 168 find_formats (void)
 169 {
 170   int i;
 171
 172   for (i = 0; i < NUM_RTX_CODE; i++)
 173     {
 174       const char **f;
 175
 176       if (special_format (defs[i].format))
 177         continue;
 178
 179       for (f = formats; *f; f++)
 180         if (! strcmp (*f, defs[i].format))
 181           break;
 182
 183       if (*f == 0)
 184         *f = defs[i].format;
 185     }
 186 }
 187
 188 /* Write the declarations for the routine to allocate RTL with FORMAT.  */
 189
 190 static void
 191 gendecl (const char *format)
 192 {
 193   const char *p;
 194   int i, pos;
 195
 196   printf ("extern rtx gen_rtx_fmt_%s\t (RTX_CODE, ", format);
 197   printf ("enum machine_mode mode");
 198
 199   /* Write each parameter that is needed and start a new line when the line
 200      would overflow.  */
 201   for (p = format, i = 0, pos = 75; *p != 0; p++)
 202     if (*p != '0')
 203       {
 204         int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
 205
 206         printf (",");
 207         if (pos + ourlen > 76)
 208           printf ("\n\t\t\t\t      "), pos = 39;
 209
 210         printf (" %sarg%d", type_from_format (*p), i++);
 211         pos += ourlen;
 212       }
 213
 214   printf (");\n");
 215 }
 216
 217 /* Generate macros to generate RTL of code IDX using the functions we
 218    write.  */
 219
 220 static void
 221 genmacro (int idx)
 222 {
 223   const char *p;
 224   int i;
 225
 226   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 227      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 228
 229   if (excluded_rtx (idx))
 230     /* Don't define a macro for this code.  */
 231     return;
 232
 233   printf ("#define gen_rtx_%s%s(MODE",
 234            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 235
 236   for (p = defs[idx].format, i = 0; *p != 0; p++)
 237     if (*p != '0')
 238       printf (", ARG%d", i++);
 239
 240   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 241           defs[idx].format, defs[idx].enumname);
 242
 243   for (p = defs[idx].format, i = 0; *p != 0; p++)
 244     if (*p != '0')
 245       printf (", (ARG%d)", i++);
 246
 247   puts (")");
 248 }
 249
 250 /* Generate the code for the function to generate RTL whose
 251    format is FORMAT.  */
 252
 253 static void
 254 gendef (const char *format)
 255 {
 256   const char *p;
 257   int i, j;
 258
 259   /* Start by writing the definition of the function name and the types
 260      of the arguments.  */
 261
 262   printf ("rtx\ngen_rtx_fmt_%s (RTX_CODE code, enum machine_mode mode", format);
 263   for (p = format, i = 0; *p != 0; p++)
 264     if (*p != '0')
 265       printf (",\n\t%sarg%d", type_from_format (*p), i++);
 266
 267   puts (")");
 268
 269   /* Now write out the body of the function itself, which allocates
 270      the memory and initializes it.  */
 271   puts ("{");
 272   puts ("  rtx rt;");
 273   printf ("  rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
 274
 275   puts ("  memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
 276   puts ("  PUT_CODE (rt, code);");
 277   puts ("  PUT_MODE (rt, mode);");
 278
 279   for (p = format, i = j = 0; *p ; ++p, ++i)
 280     if (*p != '0')
 281       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 282     else
 283       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 284
 285   puts ("\n  return rt;\n}\n");
 286 }
 287
 288 /* Generate the documentation header for files we write.  */
 289
 290 static void
 291 genlegend (void)
 292 {
 293   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 294 }
 295
 296 /* Generate the text of the header file we make, genrtl.h.  */
 297
 298 static void
 299 genheader (void)
 300 {
 301   int i;
 302   const char **fmt;
 303
 304   puts ("#ifndef GCC_GENRTL_H");
 305   puts ("#define GCC_GENRTL_H\n");
 306
 307   for (fmt = formats; *fmt; ++fmt)
 308     gendecl (*fmt);
 309
 310   putchar ('\n');
 311
 312   for (i = 0; i < NUM_RTX_CODE; i++)
 313     if (! special_format (defs[i].format))
 314       genmacro (i);
 315
 316   puts ("\n#endif /* GCC_GENRTL_H */");
 317 }
 318
 319 /* Generate the text of the code file we write, genrtl.c.  */
 320
 321 static void
 322 gencode (void)
 323 {
 324   const char **fmt;
 325
 326   puts ("#include \"config.h\"");
 327   puts ("#include \"system.h\"");
 328   puts ("#include \"coretypes.h\"");
 329   puts ("#include \"tm.h\"");
 330   puts ("#include \"obstack.h\"");
 331   puts ("#include \"rtl.h\"");
 332   puts ("#include \"ggc.h\"\n");
 333
 334   for (fmt = formats; *fmt != 0; fmt++)
 335     gendef (*fmt);
 336 }
 337
 338 /* This is the main program.  We accept only one argument, "-h", which
 339    says we are writing the genrtl.h file.  Otherwise we are writing the
 340    genrtl.c file.  */
 341
 342 int
 343 main (int argc, char **argv)
 344 {
 345   find_formats ();
 346   genlegend ();
 347
 348   if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
 349     genheader ();
 350   else
 351     gencode ();
 352
 353   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 354     return FATAL_EXIT_CODE;
 355
 356   return SUCCESS_EXIT_CODE;
 357 }