gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997, 1998, 1999, 2000 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 /* Calculate the format for CONST_DOUBLE.  This depends on the relative
  32    widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
  33
  34    We need to go out to e0wwwww, since real.c assumes 16 bits per element
  35    in REAL_VALUE_TYPE.
  36
  37    This is duplicated in rtl.c.
  38
  39    A number of places assume that there are always at least two 'w'
  40    slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
  41
  42 #if MAX_LONG_DOUBLE_TYPE_SIZE == 96
  43 # define REAL_WIDTH     \
  44      (11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  45 #else
  46 # if MAX_LONG_DOUBLE_TYPE_SIZE == 128
  47 #  define REAL_WIDTH    \
  48      (19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  49 # else
  50 #  if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
  51 #   define REAL_WIDTH   \
  52       (7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  53 #  endif
  54 # endif
  55 #endif
  56
  57 #ifndef REAL_WIDTH
  58 # if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
  59 #  define REAL_WIDTH    2
  60 # else
  61 #  if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
  62 #   define REAL_WIDTH   3
  63 #  else
  64 #   if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
  65 #    define REAL_WIDTH  4
  66 #   endif
  67 #  endif
  68 # endif
  69 #endif /* REAL_WIDTH */
  70
  71 #if REAL_WIDTH == 1
  72 # define CONST_DOUBLE_FORMAT    "0ww"
  73 #else
  74 # if REAL_WIDTH == 2
  75 #  define CONST_DOUBLE_FORMAT   "0ww"
  76 # else
  77 #  if REAL_WIDTH == 3
  78 #   define CONST_DOUBLE_FORMAT  "0www"
  79 #  else
  80 #   if REAL_WIDTH == 4
  81 #    define CONST_DOUBLE_FORMAT "0wwww"
  82 #   else
  83 #    if REAL_WIDTH == 5
  84 #     define CONST_DOUBLE_FORMAT        "0wwwww"
  85 #    else
  86 #     define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
  87 #    endif
  88 #   endif
  89 #  endif
  90 # endif
  91 #endif
  92
  93
  94 struct rtx_definition
  95 {
  96   const char *const enumname, *const name, *const format;
  97 };
  98
  99 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGX(ENUM), NAME, FORMAT },
 100
 101 static const struct rtx_definition defs[] =
 102 {
 103 #include "rtl.def"              /* rtl expressions are documented here */
 104 };
 105
 106 static const char *formats[NUM_RTX_CODE];
 107
 108 static const char *type_from_format     PARAMS ((int));
 109 static const char *accessor_from_format PARAMS ((int));
 110 static int special_format               PARAMS ((const char *));
 111 static int special_rtx                  PARAMS ((int));
 112 static void find_formats                PARAMS ((void));
 113 static void gendecl                     PARAMS ((const char *));
 114 static void genmacro                    PARAMS ((int));
 115 static void gendef                      PARAMS ((const char *));
 116 static void genlegend                   PARAMS ((void));
 117 static void genheader                   PARAMS ((void));
 118 static void gencode                     PARAMS ((void));
 119 \f
 120 /* Decode a format letter into a C type string.  */
 121
 122 static const char *
 123 type_from_format (c)
 124      int c;
 125 {
 126   switch (c)
 127     {
 128     case 'i':
 129       return "int ";
 130
 131     case 'w':
 132       return "HOST_WIDE_INT ";
 133
 134     case 's':
 135       return "const char *";
 136
 137     case 'e':  case 'u':
 138       return "rtx ";
 139
 140     case 'E':
 141       return "rtvec ";
 142     case 'b':
 143       return "struct bitmap_head_def *";  /* bitmap - typedef not available */
 144     case 't':
 145       return "union tree_node *";  /* tree - typedef not available */
 146     default:
 147       abort ();
 148     }
 149 }
 150
 151 /* Decode a format letter into the proper accessor function.  */
 152
 153 static const char *
 154 accessor_from_format (c)
 155      int c;
 156 {
 157   switch (c)
 158     {
 159     case 'i':
 160       return "XINT";
 161
 162     case 'w':
 163       return "XWINT";
 164
 165     case 's':
 166       return "XSTR";
 167
 168     case 'e':  case 'u':
 169       return "XEXP";
 170
 171     case 'E':
 172       return "XVEC";
 173
 174     case 'b':
 175       return "XBITMAP";
 176
 177     case 't':
 178       return "XTREE";
 179
 180     default:
 181       abort ();
 182     }
 183 }
 184
 185 /* Return nonzero if we should ignore FMT, an RTL format, when making
 186    the list of formats we write routines to create.  */
 187
 188 static int
 189 special_format (fmt)
 190      const char *fmt;
 191 {
 192   return (strchr (fmt, '*') != 0
 193           || strchr (fmt, 'V') != 0
 194           || strchr (fmt, 'S') != 0
 195           || strchr (fmt, 'n') != 0);
 196 }
 197
 198 /* Return nonzero if the RTL code given by index IDX is one that we should not
 199    generate a gen_RTX_FOO function foo (because that function is present
 200    elsewhere in the compiler).  */
 201
 202 static int
 203 special_rtx (idx)
 204      int idx;
 205 {
 206   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 207           || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
 208           || strcmp (defs[idx].enumname, "REG") == 0
 209           || strcmp (defs[idx].enumname, "SUBREG") == 0
 210           || strcmp (defs[idx].enumname, "MEM") == 0);
 211 }
 212
 213 /* Place a list of all format specifiers we use into the array FORMAT.  */
 214
 215 static void
 216 find_formats ()
 217 {
 218   int i;
 219
 220   for (i = 0; i < NUM_RTX_CODE; i++)
 221     {
 222       const char **f;
 223
 224       if (special_format (defs[i].format))
 225         continue;
 226
 227       for (f = formats; *f; f++)
 228         if (! strcmp (*f, defs[i].format))
 229           break;
 230
 231       if (*f == 0)
 232         *f = defs[i].format;
 233     }
 234 }
 235
 236 /* Write the declarations for the routine to allocate RTL with FORMAT.  */
 237
 238 static void
 239 gendecl (format)
 240      const char *format;
 241 {
 242   const char *p;
 243   int i, pos;
 244
 245   printf ("extern rtx gen_rtx_fmt_%s\tPARAMS ((RTX_CODE, ", format);
 246   printf ("enum machine_mode mode");
 247
 248   /* Write each parameter that is needed and start a new line when the line
 249      would overflow.  */
 250   for (p = format, i = 0, pos = 75; *p != 0; p++)
 251     if (*p != '0')
 252       {
 253         int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
 254
 255         printf (",");
 256         if (pos + ourlen > 76)
 257           printf ("\n\t\t\t\t      "), pos = 39;
 258
 259         printf (" %sarg%d", type_from_format (*p), i++);
 260         pos += ourlen;
 261       }
 262
 263   printf ("));\n");
 264 }
 265
 266 /* Generate macros to generate RTL of code IDX using the functions we
 267    write.  */
 268
 269 static void
 270 genmacro (idx)
 271      int idx;
 272 {
 273   const char *p;
 274   int i;
 275
 276   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 277      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 278
 279   printf ("#define gen_rtx_%s%s(MODE",
 280            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 281
 282   for (p = defs[idx].format, i = 0; *p != 0; p++)
 283     if (*p != '0')
 284       printf (", ARG%d", i++);
 285
 286   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 287           defs[idx].format, defs[idx].enumname);
 288
 289   for (p = defs[idx].format, i = 0; *p != 0; p++)
 290     if (*p != '0')
 291       printf (", (ARG%d)", i++);
 292
 293   puts (")");
 294 }
 295
 296 /* Generate the code for the function to generate RTL whose
 297    format is FORMAT.  */
 298
 299 static void
 300 gendef (format)
 301      const char *format;
 302 {
 303   const char *p;
 304   int i, j;
 305
 306   /* Start by writing the definition of the function name and the types
 307      of the arguments.  */
 308
 309   printf ("rtx\ngen_rtx_fmt_%s (code, mode", format);
 310   for (p = format, i = 0; *p != 0; p++)
 311     if (*p != '0')
 312       printf (", arg%d", i++);
 313
 314   puts (")\n     RTX_CODE code;\n     enum machine_mode mode;");
 315   for (p = format, i = 0; *p != 0; p++)
 316     if (*p != '0')
 317       printf ("     %sarg%d;\n", type_from_format (*p), i++);
 318
 319   /* Now write out the body of the function itself, which allocates
 320      the memory and initializes it.  */
 321   puts ("{");
 322   puts ("  rtx rt;");
 323   printf ("  rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
 324
 325   puts ("  memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
 326   puts ("  PUT_CODE (rt, code);");
 327   puts ("  PUT_MODE (rt, mode);");
 328
 329   for (p = format, i = j = 0; *p ; ++p, ++i)
 330     if (*p != '0')
 331       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 332     else
 333       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 334
 335   puts ("\n  return rt;\n}\n");
 336 }
 337
 338 /* Generate the documentation header for files we write.  */
 339
 340 static void
 341 genlegend ()
 342 {
 343   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 344 }
 345
 346 /* Generate the text of the header file we make, genrtl.h.  */
 347
 348 static void
 349 genheader ()
 350 {
 351   int i;
 352   const char **fmt;
 353
 354   puts ("#ifndef GCC_GENRTL_H");
 355   puts ("#define GCC_GENRTL_H\n");
 356
 357   for (fmt = formats; *fmt; ++fmt)
 358     gendecl (*fmt);
 359
 360   putchar ('\n');
 361
 362   for (i = 0; i < NUM_RTX_CODE; i++)
 363     if (! special_format (defs[i].format))
 364       genmacro (i);
 365
 366   puts ("\n#endif /* GCC_GENRTL_H */");
 367 }
 368
 369 /* Generate the text of the code file we write, genrtl.c.  */
 370
 371 static void
 372 gencode ()
 373 {
 374   const char **fmt;
 375
 376   puts ("#include \"config.h\"");
 377   puts ("#include \"system.h\"");
 378   puts ("#include \"obstack.h\"");
 379   puts ("#include \"rtl.h\"");
 380   puts ("#include \"ggc.h\"\n");
 381   puts ("extern struct obstack *rtl_obstack;\n");
 382   puts ("#define obstack_alloc_rtx(n)                                   \\");
 383   puts ("    ((rtx) obstack_alloc (rtl_obstack,                         \\");
 384   puts ("                         sizeof (struct rtx_def)               \\");
 385   puts ("                         + ((n) - 1) * sizeof (rtunion)))\n");
 386
 387   for (fmt = formats; *fmt != 0; fmt++)
 388     gendef (*fmt);
 389 }
 390
 391 /* This is the main program.  We accept only one argument, "-h", which
 392    says we are writing the genrtl.h file.  Otherwise we are writing the
 393    genrtl.c file.  */
 394 extern int main PARAMS ((int, char **));
 395
 396 int
 397 main (argc, argv)
 398      int argc;
 399      char **argv;
 400 {
 401   find_formats ();
 402   genlegend ();
 403
 404   if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
 405     genheader ();
 406   else
 407     gencode ();
 408
 409   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 410     return FATAL_EXIT_CODE;
 411
 412   return SUCCESS_EXIT_CODE;
 413 }