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 't':
  80       return "union tree_node *";  /* tree - typedef not available */
  81     case 'B':
  82       return "struct basic_block_def *";  /* basic block - typedef not available */
  83     default:
  84       gcc_unreachable ();
  85     }
  86 }
  87
  88 /* Decode a format letter into the proper accessor function.  */
  89
  90 static const char *
  91 accessor_from_format (int c)
  92 {
  93   switch (c)
  94     {
  95     case 'i':
  96       return "XINT";
  97
  98     case 'w':
  99       return "XWINT";
 100
 101     case 's':
 102       return "XSTR";
 103
 104     case 'e':  case 'u':
 105       return "XEXP";
 106
 107     case 'E':
 108       return "XVEC";
 109
 110     case 't':
 111       return "XTREE";
 112
 113     case 'B':
 114       return "XBBDEF";
 115
 116     default:
 117       gcc_unreachable ();
 118     }
 119 }
 120
 121 /* Return nonzero if we should ignore FMT, an RTL format, when making
 122    the list of formats we write routines to create.  */
 123
 124 static int
 125 special_format (const char *fmt)
 126 {
 127   return (strchr (fmt, '*') != 0
 128           || strchr (fmt, 'V') != 0
 129           || strchr (fmt, 'S') != 0
 130           || strchr (fmt, 'n') != 0);
 131 }
 132
 133 /* Return nonzero if the RTL code given by index IDX is one that we should
 134    generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
 135    is a wrapper in emit-rtl.c).  */
 136
 137 static int
 138 special_rtx (int idx)
 139 {
 140   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 141           || strcmp (defs[idx].enumname, "REG") == 0
 142           || strcmp (defs[idx].enumname, "SUBREG") == 0
 143           || strcmp (defs[idx].enumname, "MEM") == 0
 144           || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
 145 }
 146
 147 /* Return nonzero if the RTL code given by index IDX is one that we should
 148    generate no macro for at all (because gen_rtx_FOO is never used or
 149    cannot have the obvious interface).  */
 150
 151 static int
 152 excluded_rtx (int idx)
 153 {
 154   return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0)
 155           || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0));
 156 }
 157
 158 /* Place a list of all format specifiers we use into the array FORMAT.  */
 159
 160 static void
 161 find_formats (void)
 162 {
 163   unsigned int i;
 164
 165   for (i = 0; i < NUM_RTX_CODE; i++)
 166     {
 167       const char **f;
 168
 169       if (special_format (defs[i].format))
 170         continue;
 171
 172       for (f = formats; *f; f++)
 173         if (! strcmp (*f, defs[i].format))
 174           break;
 175
 176       if (*f == 0)
 177         *f = defs[i].format;
 178     }
 179 }
 180
 181 /* Write the declarations for the routine to allocate RTL with FORMAT.  */
 182
 183 static void
 184 gendecl (const char *format)
 185 {
 186   const char *p;
 187   int i, pos;
 188
 189   printf ("extern rtx gen_rtx_fmt_%s_stat\t (RTX_CODE, ", format);
 190   printf ("enum machine_mode mode");
 191
 192   /* Write each parameter that is needed and start a new line when the line
 193      would overflow.  */
 194   for (p = format, i = 0, pos = 75; *p != 0; p++)
 195     if (*p != '0')
 196       {
 197         int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
 198
 199         printf (",");
 200         if (pos + ourlen > 76)
 201           printf ("\n\t\t\t\t      "), pos = 39;
 202
 203         printf (" %sarg%d", type_from_format (*p), i++);
 204         pos += ourlen;
 205       }
 206   printf (" MEM_STAT_DECL");
 207
 208   printf (");\n");
 209   printf ("#define gen_rtx_fmt_%s(c, m", format);
 210   for (p = format, i = 0; *p != 0; p++)
 211     if (*p != '0')
 212       printf (", p%i",i++);
 213   printf (")\\\n        gen_rtx_fmt_%s_stat (c, m", format);
 214   for (p = format, i = 0; *p != 0; p++)
 215     if (*p != '0')
 216       printf (", p%i",i++);
 217   printf (" MEM_STAT_INFO)\n\n");
 218 }
 219
 220 /* Generate macros to generate RTL of code IDX using the functions we
 221    write.  */
 222
 223 static void
 224 genmacro (int idx)
 225 {
 226   const char *p;
 227   int i;
 228
 229   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 230      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 231
 232   if (excluded_rtx (idx))
 233     /* Don't define a macro for this code.  */
 234     return;
 235
 236   printf ("#define gen_rtx_%s%s(MODE",
 237            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 238
 239   for (p = defs[idx].format, i = 0; *p != 0; p++)
 240     if (*p != '0')
 241       printf (", ARG%d", i++);
 242
 243   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 244           defs[idx].format, defs[idx].enumname);
 245
 246   for (p = defs[idx].format, i = 0; *p != 0; p++)
 247     if (*p != '0')
 248       printf (", (ARG%d)", i++);
 249
 250   puts (")");
 251 }
 252
 253 /* Generate the code for the function to generate RTL whose
 254    format is FORMAT.  */
 255
 256 static void
 257 gendef (const char *format)
 258 {
 259   const char *p;
 260   int i, j;
 261
 262   /* Start by writing the definition of the function name and the types
 263      of the arguments.  */
 264
 265   printf ("rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format);
 266   for (p = format, i = 0; *p != 0; p++)
 267     if (*p != '0')
 268       printf (",\n\t%sarg%d", type_from_format (*p), i++);
 269
 270   puts (" MEM_STAT_DECL)");
 271
 272   /* Now write out the body of the function itself, which allocates
 273      the memory and initializes it.  */
 274   puts ("{");
 275   puts ("  rtx rt;");
 276   puts ("  rt = rtx_alloc_stat (code PASS_MEM_STAT);\n");
 277
 278   puts ("  PUT_MODE (rt, mode);");
 279
 280   for (p = format, i = j = 0; *p ; ++p, ++i)
 281     if (*p != '0')
 282       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 283     else
 284       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 285
 286   puts ("\n  return rt;\n}\n");
 287 }
 288
 289 /* Generate the documentation header for files we write.  */
 290
 291 static void
 292 genlegend (void)
 293 {
 294   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 295 }
 296
 297 /* Generate the text of the header file we make, genrtl.h.  */
 298
 299 static void
 300 genheader (void)
 301 {
 302   unsigned int i;
 303   const char **fmt;
 304
 305   puts ("#ifndef GCC_GENRTL_H");
 306   puts ("#define GCC_GENRTL_H\n");
 307   puts ("#include \"statistics.h\"\n");
 308
 309   for (fmt = formats; *fmt; ++fmt)
 310     gendecl (*fmt);
 311
 312   putchar ('\n');
 313
 314   for (i = 0; i < NUM_RTX_CODE; i++)
 315     if (! special_format (defs[i].format))
 316       genmacro (i);
 317
 318   puts ("\n#endif /* GCC_GENRTL_H */");
 319 }
 320
 321 /* Generate the text of the code file we write, genrtl.c.  */
 322
 323 static void
 324 gencode (void)
 325 {
 326   const char **fmt;
 327
 328   puts ("#include \"config.h\"");
 329   puts ("#include \"system.h\"");
 330   puts ("#include \"coretypes.h\"");
 331   puts ("#include \"tm.h\"");
 332   puts ("#include \"obstack.h\"");
 333   puts ("#include \"rtl.h\"");
 334   puts ("#include \"ggc.h\"\n");
 335
 336   for (fmt = formats; *fmt != 0; fmt++)
 337     gendef (*fmt);
 338 }
 339
 340 /* This is the main program.  We accept only one argument, "-h", which
 341    says we are writing the genrtl.h file.  Otherwise we are writing the
 342    genrtl.c file.  */
 343
 344 int
 345 main (int argc, char **argv)
 346 {
 347   find_formats ();
 348   genlegend ();
 349
 350   if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
 351     genheader ();
 352   else
 353     gencode ();
 354
 355   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 356     return FATAL_EXIT_CODE;
 357
 358   return SUCCESS_EXIT_CODE;
 359 }