gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2007
   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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "bconfig.h"
  23 #include "system.h"
  24
  25 struct rtx_definition
  26 {
  27   const char *const enumname, *const name, *const format;
  28 };
  29
  30 /* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what
  31    CONST_DOUBLE_FORMAT is because we're not going to be generating
  32    anything for CONST_DOUBLE anyway.  */
  33 #define CONST_DOUBLE_FORMAT ""
  34
  35 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT },
  36
  37 static const struct rtx_definition defs[] =
  38 {
  39 #include "rtl.def"              /* rtl expressions are documented here */
  40 };
  41 #define NUM_RTX_CODE ARRAY_SIZE(defs)
  42
  43 static const char *formats[NUM_RTX_CODE];
  44
  45 static const char *type_from_format     (int);
  46 static const char *accessor_from_format (int);
  47 static int special_format               (const char *);
  48 static int special_rtx                  (int);
  49 static int excluded_rtx                 (int);
  50 static void find_formats                (void);
  51 static void gendecl                     (const char *);
  52 static void genmacro                    (int);
  53 static void gendef                      (const char *);
  54 static void genlegend                   (void);
  55 static void genheader                   (void);
  56 static void gencode                     (void);
  57 \f
  58 /* Decode a format letter into a C type string.  */
  59
  60 static const char *
  61 type_from_format (int c)
  62 {
  63   switch (c)
  64     {
  65     case 'i':
  66       return "int ";
  67
  68     case 'w':
  69       return "HOST_WIDE_INT ";
  70
  71     case 's':
  72       return "const char *";
  73
  74     case 'e':  case 'u':
  75       return "rtx ";
  76
  77     case 'E':
  78       return "rtvec ";
  79     case 'b':
  80       return "struct bitmap_head_def *";  /* bitmap - typedef not available */
  81     case 't':
  82       return "union tree_node *";  /* tree - typedef not available */
  83     case 'B':
  84       return "struct basic_block_def *";  /* basic block - typedef not available */
  85     default:
  86       gcc_unreachable ();
  87     }
  88 }
  89
  90 /* Decode a format letter into the proper accessor function.  */
  91
  92 static const char *
  93 accessor_from_format (int c)
  94 {
  95   switch (c)
  96     {
  97     case 'i':
  98       return "XINT";
  99
 100     case 'w':
 101       return "XWINT";
 102
 103     case 's':
 104       return "XSTR";
 105
 106     case 'e':  case 'u':
 107       return "XEXP";
 108
 109     case 'E':
 110       return "XVEC";
 111
 112     case 'b':
 113       return "XBITMAP";
 114
 115     case 't':
 116       return "XTREE";
 117
 118     case 'B':
 119       return "XBBDEF";
 120
 121     default:
 122       gcc_unreachable ();
 123     }
 124 }
 125
 126 /* Return nonzero if we should ignore FMT, an RTL format, when making
 127    the list of formats we write routines to create.  */
 128
 129 static int
 130 special_format (const char *fmt)
 131 {
 132   return (strchr (fmt, '*') != 0
 133           || strchr (fmt, 'V') != 0
 134           || strchr (fmt, 'S') != 0
 135           || strchr (fmt, 'n') != 0);
 136 }
 137
 138 /* Return nonzero if the RTL code given by index IDX is one that we should
 139    generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
 140    is a wrapper in emit-rtl.c).  */
 141
 142 static int
 143 special_rtx (int idx)
 144 {
 145   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 146           || strcmp (defs[idx].enumname, "REG") == 0
 147           || strcmp (defs[idx].enumname, "SUBREG") == 0
 148           || strcmp (defs[idx].enumname, "MEM") == 0
 149           || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
 150 }
 151
 152 /* Return nonzero if the RTL code given by index IDX is one that we should
 153    generate no macro for at all (because gen_rtx_FOO is never used or
 154    cannot have the obvious interface).  */
 155
 156 static int
 157 excluded_rtx (int idx)
 158 {
 159   return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0)
 160           || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0));
 161 }
 162
 163 /* Place a list of all format specifiers we use into the array FORMAT.  */
 164
 165 static void
 166 find_formats (void)
 167 {
 168   unsigned int i;
 169
 170   for (i = 0; i < NUM_RTX_CODE; i++)
 171     {
 172       const char **f;
 173
 174       if (special_format (defs[i].format))
 175         continue;
 176
 177       for (f = formats; *f; f++)
 178         if (! strcmp (*f, defs[i].format))
 179           break;
 180
 181       if (*f == 0)
 182         *f = defs[i].format;
 183     }
 184 }
 185
 186 /* Write the declarations for the routine to allocate RTL with FORMAT.  */
 187
 188 static void
 189 gendecl (const char *format)
 190 {
 191   const char *p;
 192   int i, pos;
 193
 194   printf ("extern rtx gen_rtx_fmt_%s_stat\t (RTX_CODE, ", format);
 195   printf ("enum machine_mode mode");
 196
 197   /* Write each parameter that is needed and start a new line when the line
 198      would overflow.  */
 199   for (p = format, i = 0, pos = 75; *p != 0; p++)
 200     if (*p != '0')
 201       {
 202         int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
 203
 204         printf (",");
 205         if (pos + ourlen > 76)
 206           printf ("\n\t\t\t\t      "), pos = 39;
 207
 208         printf (" %sarg%d", type_from_format (*p), i++);
 209         pos += ourlen;
 210       }
 211   printf (" MEM_STAT_DECL");
 212
 213   printf (");\n");
 214   printf ("#define gen_rtx_fmt_%s(c, m", format);
 215   for (p = format, i = 0; *p != 0; p++)
 216     if (*p != '0')
 217       printf (", p%i",i++);
 218   printf (")\\\n        gen_rtx_fmt_%s_stat (c, m", format);
 219   for (p = format, i = 0; *p != 0; p++)
 220     if (*p != '0')
 221       printf (", p%i",i++);
 222   printf (" MEM_STAT_INFO)\n\n");
 223 }
 224
 225 /* Generate macros to generate RTL of code IDX using the functions we
 226    write.  */
 227
 228 static void
 229 genmacro (int idx)
 230 {
 231   const char *p;
 232   int i;
 233
 234   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 235      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 236
 237   if (excluded_rtx (idx))
 238     /* Don't define a macro for this code.  */
 239     return;
 240
 241   printf ("#define gen_rtx_%s%s(MODE",
 242            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 243
 244   for (p = defs[idx].format, i = 0; *p != 0; p++)
 245     if (*p != '0')
 246       printf (", ARG%d", i++);
 247
 248   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 249           defs[idx].format, defs[idx].enumname);
 250
 251   for (p = defs[idx].format, i = 0; *p != 0; p++)
 252     if (*p != '0')
 253       printf (", (ARG%d)", i++);
 254
 255   puts (")");
 256 }
 257
 258 /* Generate the code for the function to generate RTL whose
 259    format is FORMAT.  */
 260
 261 static void
 262 gendef (const char *format)
 263 {
 264   const char *p;
 265   int i, j;
 266
 267   /* Start by writing the definition of the function name and the types
 268      of the arguments.  */
 269
 270   printf ("rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format);
 271   for (p = format, i = 0; *p != 0; p++)
 272     if (*p != '0')
 273       printf (",\n\t%sarg%d", type_from_format (*p), i++);
 274
 275   puts (" MEM_STAT_DECL)");
 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   puts ("  rt = rtx_alloc_stat (code PASS_MEM_STAT);\n");
 282
 283   puts ("  PUT_MODE (rt, mode);");
 284
 285   for (p = format, i = j = 0; *p ; ++p, ++i)
 286     if (*p != '0')
 287       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 288     else
 289       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 290
 291   puts ("\n  return rt;\n}\n");
 292 }
 293
 294 /* Generate the documentation header for files we write.  */
 295
 296 static void
 297 genlegend (void)
 298 {
 299   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 300 }
 301
 302 /* Generate the text of the header file we make, genrtl.h.  */
 303
 304 static void
 305 genheader (void)
 306 {
 307   unsigned int i;
 308   const char **fmt;
 309
 310   puts ("#ifndef GCC_GENRTL_H");
 311   puts ("#define GCC_GENRTL_H\n");
 312   puts ("#include \"statistics.h\"\n");
 313
 314   for (fmt = formats; *fmt; ++fmt)
 315     gendecl (*fmt);
 316
 317   putchar ('\n');
 318
 319   for (i = 0; i < NUM_RTX_CODE; i++)
 320     if (! special_format (defs[i].format))
 321       genmacro (i);
 322
 323   puts ("\n#endif /* GCC_GENRTL_H */");
 324 }
 325
 326 /* Generate the text of the code file we write, genrtl.c.  */
 327
 328 static void
 329 gencode (void)
 330 {
 331   const char **fmt;
 332
 333   puts ("#include \"config.h\"");
 334   puts ("#include \"system.h\"");
 335   puts ("#include \"coretypes.h\"");
 336   puts ("#include \"tm.h\"");
 337   puts ("#include \"obstack.h\"");
 338   puts ("#include \"rtl.h\"");
 339   puts ("#include \"ggc.h\"\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
 349 int
 350 main (int argc, char **argv)
 351 {
 352   find_formats ();
 353   genlegend ();
 354
 355   if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
 356     genheader ();
 357   else
 358     gencode ();
 359
 360   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 361     return FATAL_EXIT_CODE;
 362
 363   return SUCCESS_EXIT_CODE;
 364 }