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 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 #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_ARITHMETIC assumes 16-bits
  35    per element 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 #ifdef REAL_ARITHMETIC
  43 # if MAX_LONG_DOUBLE_TYPE_SIZE == 96
  44 #  define REAL_WIDTH    \
  45      (11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  46 # else
  47 #  if MAX_LONG_DOUBLE_TYPE_SIZE == 128
  48 #   define REAL_WIDTH   \
  49       (19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  50 #  else
  51 #   if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
  52 #    define REAL_WIDTH  \
  53       (7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
  54 #   endif
  55 #  endif
  56 # endif
  57 #endif /* REAL_ARITHMETIC */
  58
  59 #ifndef REAL_WIDTH
  60 # if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
  61 #  define REAL_WIDTH    2
  62 # else
  63 #  if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
  64 #   define REAL_WIDTH   3
  65 #  else
  66 #   if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
  67 #    define REAL_WIDTH  4
  68 #   endif
  69 #  endif
  70 # endif
  71 #endif /* REAL_WIDTH */
  72
  73 #if REAL_WIDTH == 1
  74 # define CONST_DOUBLE_FORMAT    "e0ww"
  75 #else
  76 # if REAL_WIDTH == 2
  77 #  define CONST_DOUBLE_FORMAT   "e0ww"
  78 # else
  79 #  if REAL_WIDTH == 3
  80 #   define CONST_DOUBLE_FORMAT  "e0www"
  81 #  else
  82 #   if REAL_WIDTH == 4
  83 #    define CONST_DOUBLE_FORMAT "e0wwww"
  84 #   else
  85 #    if REAL_WIDTH == 5
  86 #     define CONST_DOUBLE_FORMAT        "e0wwwww"
  87 #    else
  88 #     define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
  89 #    endif
  90 #   endif
  91 #  endif
  92 # endif
  93 #endif
  94
  95
  96 struct rtx_definition
  97 {
  98   const char *enumname, *name, *format;
  99 };
 100
 101 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGIFY(ENUM), NAME, FORMAT },
 102
 103 struct rtx_definition defs[] =
 104 {
 105 #include "rtl.def"              /* rtl expressions are documented here */
 106 };
 107
 108 const char *formats[NUM_RTX_CODE];
 109
 110 static const char *type_from_format     PARAMS ((int));
 111 static const char *accessor_from_format PARAMS ((int));
 112 static int special_format               PARAMS ((const char *));
 113 static int special_rtx                  PARAMS ((int));
 114 static void find_formats                PARAMS ((void));
 115 static void gendecl                     PARAMS ((const char *));
 116 static void genmacro                    PARAMS ((int));
 117 static void gendef                      PARAMS ((const char *));
 118 static void genlegend                   PARAMS ((void));
 119 static void genheader                   PARAMS ((void));
 120 static void gencode                     PARAMS ((void));
 121 \f
 122 /* Decode a format letter into a C type string.  */
 123
 124 static const char *
 125 type_from_format (c)
 126      int c;
 127 {
 128   switch (c)
 129     {
 130     case 'i':
 131       return "int ";
 132
 133     case 'w':
 134       return "HOST_WIDE_INT ";
 135
 136     case 's':
 137       return "const char *";
 138
 139     case 'e':  case 'u':
 140       return "rtx ";
 141
 142     case 'E':
 143       return "rtvec ";
 144     case 'b':
 145       return "struct bitmap_head_def *";  /* bitmap - typedef not available */
 146     case 't':
 147       return "union tree_node *";  /* tree - typedef not available */
 148     default:
 149       abort ();
 150     }
 151 }
 152
 153 /* Decode a format letter into the proper accessor function.  */
 154
 155 static const char *
 156 accessor_from_format (c)
 157      int c;
 158 {
 159   switch (c)
 160     {
 161     case 'i':
 162       return "XINT";
 163
 164     case 'w':
 165       return "XWINT";
 166
 167     case 's':
 168       return "XSTR";
 169
 170     case 'e':  case 'u':
 171       return "XEXP";
 172
 173     case 'E':
 174       return "XVEC";
 175
 176     case 'b':
 177       return "XBITMAP";
 178
 179     case 't':
 180       return "XTREE";
 181
 182     default:
 183       abort ();
 184     }
 185 }
 186
 187 /* Return nonzero if we should ignore FMT, an RTL format, when making
 188    the list of formats we write routines to create.  */
 189
 190 static int
 191 special_format (fmt)
 192      const char *fmt;
 193 {
 194   return (strchr (fmt, '*') != 0
 195           || strchr (fmt, 'V') != 0
 196           || strchr (fmt, 'S') != 0
 197           || strchr (fmt, 'n') != 0);
 198 }
 199
 200 /* Return nonzero if the RTL code given by index IDX is one that we should not
 201    generate a gen_RTX_FOO function foo (because that function is present
 202    elsewhere in the compiler).  */
 203
 204 static int
 205 special_rtx (idx)
 206      int idx;
 207 {
 208   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 209           || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
 210           || strcmp (defs[idx].enumname, "REG") == 0
 211           || strcmp (defs[idx].enumname, "MEM") == 0);
 212 }
 213
 214 /* Place a list of all format specifiers we use into the array FORMAT. */
 215
 216 static void
 217 find_formats ()
 218 {
 219   int i;
 220
 221   for (i = 0; i < NUM_RTX_CODE; i++)
 222     {
 223       const char **f;
 224
 225       if (special_format (defs[i].format))
 226         continue;
 227
 228       for (f = formats; *f; f++)
 229         if (! strcmp (*f, defs[i].format))
 230           break;
 231
 232       if (*f == 0)
 233         *f = defs[i].format;
 234     }
 235 }
 236
 237 /* Write the declarations for the routine to allocate RTL with FORMAT.  */
 238
 239 static void
 240 gendecl (format)
 241      const char *format;
 242 {
 243   const char *p;
 244   int i, pos;
 245
 246   printf ("extern rtx gen_rtx_fmt_%s\tPARAMS ((RTX_CODE, ", format);
 247   printf ("enum machine_mode mode");
 248
 249   /* Write each parameter that is needed and start a new line when the line
 250      would overflow.  */
 251   for (p = format, i = 0, pos = 75; *p != 0; p++)
 252     if (*p != '0')
 253       {
 254         int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
 255
 256         printf (",");
 257         if (pos + ourlen > 76)
 258           printf ("\n\t\t\t\t      "), pos = 39;
 259
 260         printf (" %sarg%d", type_from_format (*p), i++);
 261         pos += ourlen;
 262       }
 263
 264   printf ("));\n");
 265 }
 266
 267 /* Generate macros to generate RTL of code IDX using the functions we
 268    write.  */
 269
 270 static void
 271 genmacro (idx)
 272      int idx;
 273 {
 274   const char *p;
 275   int i;
 276
 277   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 278      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 279
 280   printf ("#define gen_rtx_%s%s(MODE",
 281            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 282
 283   for (p = defs[idx].format, i = 0; *p != 0; p++)
 284     if (*p != '0')
 285       printf (", ARG%d", i++);
 286
 287   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 288           defs[idx].format, defs[idx].enumname);
 289
 290   for (p = defs[idx].format, i = 0; *p != 0; p++)
 291     if (*p != '0')
 292       printf (", (ARG%d)", i++);
 293
 294   puts (")");
 295 }
 296
 297 /* Generate the code for the function to generate RTL whose
 298    format is FORMAT.  */
 299
 300 static void
 301 gendef (format)
 302      const char *format;
 303 {
 304   const char *p;
 305   int i, j;
 306
 307   /* Start by writing the definition of the function name and the types
 308      of the arguments.  */
 309
 310   printf ("rtx\ngen_rtx_fmt_%s (code, mode", format);
 311   for (p = format, i = 0; *p != 0; p++)
 312     if (*p != '0')
 313       printf (", arg%d", i++);
 314
 315   puts (")\n     RTX_CODE code;\n     enum machine_mode mode;");
 316   for (p = format, i = 0; *p != 0; p++)
 317     if (*p != '0')
 318       printf ("     %sarg%d;\n", type_from_format (*p), i++);
 319
 320   /* Now write out the body of the function itself, which allocates
 321      the memory and initializes it.  */
 322   puts ("{");
 323   puts ("  rtx rt;");
 324   printf ("  rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
 325
 326   puts ("  memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
 327   puts ("  PUT_CODE (rt, code);");
 328   puts ("  PUT_MODE (rt, mode);");
 329
 330   for (p = format, i = j = 0; *p ; ++p, ++i)
 331     if (*p != '0')
 332       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 333     else
 334       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 335
 336   puts ("\n  return rt;\n}\n");
 337 }
 338
 339 /* Generate the documentation header for files we write.  */
 340
 341 static void
 342 genlegend ()
 343 {
 344   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 345 }
 346
 347 /* Generate the text of the header file we make, genrtl.h.  */
 348
 349 static void
 350 genheader ()
 351 {
 352   int i;
 353   const char **fmt;
 354
 355   for (fmt = formats; *fmt; ++fmt)
 356     gendecl (*fmt);
 357
 358   putchar ('\n');
 359
 360   for (i = 0; i < NUM_RTX_CODE; i++)
 361     if (! special_format (defs[i].format))
 362       genmacro (i);
 363 }
 364
 365 /* Generate the text of the code file we write, genrtl.c.  */
 366
 367 static void
 368 gencode ()
 369 {
 370   const char **fmt;
 371
 372   puts ("#include \"config.h\"");
 373   puts ("#include \"system.h\"");
 374   puts ("#include \"obstack.h\"");
 375   puts ("#include \"rtl.h\"");
 376   puts ("#include \"ggc.h\"\n");
 377   puts ("extern struct obstack *rtl_obstack;\n");
 378   puts ("#define obstack_alloc_rtx(n)                                   \\");
 379   puts ("    ((rtx) obstack_alloc (rtl_obstack,                         \\");
 380   puts ("                         sizeof (struct rtx_def)               \\");
 381   puts ("                         + ((n) - 1) * sizeof (rtunion)))\n");
 382
 383   for (fmt = formats; *fmt != 0; fmt++)
 384     gendef (*fmt);
 385 }
 386
 387 #if defined(USE_C_ALLOCA)
 388 PTR
 389 xmalloc (nbytes)
 390   size_t nbytes;
 391 {
 392   register PTR tmp = (PTR) malloc (nbytes);
 393
 394   if (!tmp)
 395     {
 396       fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n",
 397                nbytes);
 398       exit (FATAL_EXIT_CODE);
 399     }
 400
 401   return tmp;
 402 }
 403 #endif /* USE_C_ALLOCA */
 404
 405 /* This is the main program.  We accept only one argument, "-h", which
 406    says we are writing the genrtl.h file.  Otherwise we are writing the
 407    genrtl.c file.  */
 408 extern int main PARAMS ((int, char **));
 409
 410 int
 411 main (argc, argv)
 412      int argc;
 413      char **argv;
 414 {
 415   find_formats ();
 416   genlegend ();
 417
 418   if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
 419     genheader ();
 420   else
 421     gencode ();
 422
 423   fflush (stdout);
 424   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 425 }