gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 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 struct rtx_definition
  32 {
  33   const char *const enumname, *const name, *const format;
  34 };
  35
  36 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGX(ENUM), NAME, FORMAT },
  37
  38 static const struct rtx_definition defs[] =
  39 {
  40 #include "rtl.def"              /* rtl expressions are documented here */
  41 };
  42
  43 static const char *formats[NUM_RTX_CODE];
  44
  45 static const char *type_from_format     PARAMS ((int));
  46 static const char *accessor_from_format PARAMS ((int));
  47 static int special_format               PARAMS ((const char *));
  48 static int special_rtx                  PARAMS ((int));
  49 static int excluded_rtx                 PARAMS ((int));
  50 static void find_formats                PARAMS ((void));
  51 static void gendecl                     PARAMS ((const char *));
  52 static void genmacro                    PARAMS ((int));
  53 static void gendef                      PARAMS ((const char *));
  54 static void genlegend                   PARAMS ((void));
  55 static void genheader                   PARAMS ((void));
  56 static void gencode                     PARAMS ((void));
  57 \f
  58 /* Decode a format letter into a C type string.  */
  59
  60 static const char *
  61 type_from_format (c)
  62      int c;
  63 {
  64   switch (c)
  65     {
  66     case 'i':
  67       return "int ";
  68
  69     case 'w':
  70       return "HOST_WIDE_INT ";
  71
  72     case 's':
  73       return "const char *";
  74
  75     case 'e':  case 'u':
  76       return "rtx ";
  77
  78     case 'E':
  79       return "rtvec ";
  80     case 'b':
  81       return "struct bitmap_head_def *";  /* bitmap - typedef not available */
  82     case 't':
  83       return "union tree_node *";  /* tree - typedef not available */
  84     case 'B':
  85       return "struct basic_block_def *";  /* basic block - typedef not available */
  86     default:
  87       abort ();
  88     }
  89 }
  90
  91 /* Decode a format letter into the proper accessor function.  */
  92
  93 static const char *
  94 accessor_from_format (c)
  95      int c;
  96 {
  97   switch (c)
  98     {
  99     case 'i':
 100       return "XINT";
 101
 102     case 'w':
 103       return "XWINT";
 104
 105     case 's':
 106       return "XSTR";
 107
 108     case 'e':  case 'u':
 109       return "XEXP";
 110
 111     case 'E':
 112       return "XVEC";
 113
 114     case 'b':
 115       return "XBITMAP";
 116
 117     case 't':
 118       return "XTREE";
 119
 120     case 'B':
 121       return "XBBDEF";
 122
 123     default:
 124       abort ();
 125     }
 126 }
 127
 128 /* Return nonzero if we should ignore FMT, an RTL format, when making
 129    the list of formats we write routines to create.  */
 130
 131 static int
 132 special_format (fmt)
 133      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 (idx)
 147      int idx;
 148 {
 149   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 150           || strcmp (defs[idx].enumname, "REG") == 0
 151           || strcmp (defs[idx].enumname, "SUBREG") == 0
 152           || strcmp (defs[idx].enumname, "MEM") == 0
 153           || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
 154 }
 155
 156 /* Return nonzero if the RTL code given by index IDX is one that we should
 157    generate no macro for at all (because gen_rtx_FOO is never used or
 158    cannot have the obvious interface).  */
 159
 160 static int
 161 excluded_rtx (idx)
 162      int idx;
 163 {
 164   return (strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0);
 165 }
 166
 167 /* Place a list of all format specifiers we use into the array FORMAT.  */
 168
 169 static void
 170 find_formats ()
 171 {
 172   int i;
 173
 174   for (i = 0; i < NUM_RTX_CODE; i++)
 175     {
 176       const char **f;
 177
 178       if (special_format (defs[i].format))
 179         continue;
 180
 181       for (f = formats; *f; f++)
 182         if (! strcmp (*f, defs[i].format))
 183           break;
 184
 185       if (*f == 0)
 186         *f = defs[i].format;
 187     }
 188 }
 189
 190 /* Write the declarations for the routine to allocate RTL with FORMAT.  */
 191
 192 static void
 193 gendecl (format)
 194      const char *format;
 195 {
 196   const char *p;
 197   int i, pos;
 198
 199   printf ("extern rtx gen_rtx_fmt_%s\tPARAMS ((RTX_CODE, ", format);
 200   printf ("enum machine_mode mode");
 201
 202   /* Write each parameter that is needed and start a new line when the line
 203      would overflow.  */
 204   for (p = format, i = 0, pos = 75; *p != 0; p++)
 205     if (*p != '0')
 206       {
 207         int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
 208
 209         printf (",");
 210         if (pos + ourlen > 76)
 211           printf ("\n\t\t\t\t      "), pos = 39;
 212
 213         printf (" %sarg%d", type_from_format (*p), i++);
 214         pos += ourlen;
 215       }
 216
 217   printf ("));\n");
 218 }
 219
 220 /* Generate macros to generate RTL of code IDX using the functions we
 221    write.  */
 222
 223 static void
 224 genmacro (idx)
 225      int idx;
 226 {
 227   const char *p;
 228   int i;
 229
 230   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 231      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 232
 233   if (excluded_rtx (idx))
 234     /* Don't define a macro for this code.  */
 235     return;
 236
 237   printf ("#define gen_rtx_%s%s(MODE",
 238            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 239
 240   for (p = defs[idx].format, i = 0; *p != 0; p++)
 241     if (*p != '0')
 242       printf (", ARG%d", i++);
 243
 244   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 245           defs[idx].format, defs[idx].enumname);
 246
 247   for (p = defs[idx].format, i = 0; *p != 0; p++)
 248     if (*p != '0')
 249       printf (", (ARG%d)", i++);
 250
 251   puts (")");
 252 }
 253
 254 /* Generate the code for the function to generate RTL whose
 255    format is FORMAT.  */
 256
 257 static void
 258 gendef (format)
 259      const char *format;
 260 {
 261   const char *p;
 262   int i, j;
 263
 264   /* Start by writing the definition of the function name and the types
 265      of the arguments.  */
 266
 267   printf ("rtx\ngen_rtx_fmt_%s (code, mode", format);
 268   for (p = format, i = 0; *p != 0; p++)
 269     if (*p != '0')
 270       printf (", arg%d", i++);
 271
 272   puts (")\n     RTX_CODE code;\n     enum machine_mode mode;");
 273   for (p = format, i = 0; *p != 0; p++)
 274     if (*p != '0')
 275       printf ("     %sarg%d;\n", type_from_format (*p), i++);
 276
 277   /* Now write out the body of the function itself, which allocates
 278      the memory and initializes it.  */
 279   puts ("{");
 280   puts ("  rtx rt;");
 281   printf ("  rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
 282
 283   puts ("  memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
 284   puts ("  PUT_CODE (rt, code);");
 285   puts ("  PUT_MODE (rt, mode);");
 286
 287   for (p = format, i = j = 0; *p ; ++p, ++i)
 288     if (*p != '0')
 289       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 290     else
 291       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 292
 293   puts ("\n  return rt;\n}\n");
 294 }
 295
 296 /* Generate the documentation header for files we write.  */
 297
 298 static void
 299 genlegend ()
 300 {
 301   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 302 }
 303
 304 /* Generate the text of the header file we make, genrtl.h.  */
 305
 306 static void
 307 genheader ()
 308 {
 309   int i;
 310   const char **fmt;
 311
 312   puts ("#ifndef GCC_GENRTL_H");
 313   puts ("#define GCC_GENRTL_H\n");
 314
 315   for (fmt = formats; *fmt; ++fmt)
 316     gendecl (*fmt);
 317
 318   putchar ('\n');
 319
 320   for (i = 0; i < NUM_RTX_CODE; i++)
 321     if (! special_format (defs[i].format))
 322       genmacro (i);
 323
 324   puts ("\n#endif /* GCC_GENRTL_H */");
 325 }
 326
 327 /* Generate the text of the code file we write, genrtl.c.  */
 328
 329 static void
 330 gencode ()
 331 {
 332   const char **fmt;
 333
 334   puts ("#include \"config.h\"");
 335   puts ("#include \"system.h\"");
 336   puts ("#include \"obstack.h\"");
 337   puts ("#include \"rtl.h\"");
 338   puts ("#include \"ggc.h\"\n");
 339   puts ("extern struct obstack *rtl_obstack;\n");
 340
 341   for (fmt = formats; *fmt != 0; fmt++)
 342     gendef (*fmt);
 343 }
 344
 345 /* This is the main program.  We accept only one argument, "-h", which
 346    says we are writing the genrtl.h file.  Otherwise we are writing the
 347    genrtl.c file.  */
 348 extern int main PARAMS ((int, char **));
 349
 350 int
 351 main (argc, argv)
 352      int argc;
 353      char **argv;
 354 {
 355   find_formats ();
 356   genlegend ();
 357
 358   if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
 359     genheader ();
 360   else
 361     gencode ();
 362
 363   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 364     return FATAL_EXIT_CODE;
 365
 366   return SUCCESS_EXIT_CODE;
 367 }