gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2007, 2010,
   3    2011, 2012 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 \f
  45 /* Decode a format letter into a C type string.  */
  46
  47 static const char *
  48 type_from_format (int c)
  49 {
  50   switch (c)
  51     {
  52     case 'i':
  53       return "int ";
  54
  55     case 'w':
  56       return "HOST_WIDE_INT ";
  57
  58     case 's':
  59       return "const char *";
  60
  61     case 'e':  case 'u':
  62       return "rtx ";
  63
  64     case 'E':
  65       return "rtvec ";
  66     case 't':
  67       return "tree ";
  68     case 'B':
  69       return "basic_block ";
  70     default:
  71       gcc_unreachable ();
  72     }
  73 }
  74
  75 /* Decode a format letter into the proper accessor function.  */
  76
  77 static const char *
  78 accessor_from_format (int c)
  79 {
  80   switch (c)
  81     {
  82     case 'i':
  83       return "XINT";
  84
  85     case 'w':
  86       return "XWINT";
  87
  88     case 's':
  89       return "XSTR";
  90
  91     case 'e':  case 'u':
  92       return "XEXP";
  93
  94     case 'E':
  95       return "XVEC";
  96
  97     case 't':
  98       return "XTREE";
  99
 100     case 'B':
 101       return "XBBDEF";
 102
 103     default:
 104       gcc_unreachable ();
 105     }
 106 }
 107
 108 /* Return nonzero if we should ignore FMT, an RTL format, when making
 109    the list of formats we write routines to create.  */
 110
 111 static int
 112 special_format (const char *fmt)
 113 {
 114   return (strchr (fmt, '*') != 0
 115           || strchr (fmt, 'V') != 0
 116           || strchr (fmt, 'S') != 0
 117           || strchr (fmt, 'n') != 0);
 118 }
 119
 120 /* Return nonzero if the RTL code given by index IDX is one that we should
 121    generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
 122    is a wrapper in emit-rtl.c).  */
 123
 124 static int
 125 special_rtx (int idx)
 126 {
 127   return (strcmp (defs[idx].enumname, "CONST_INT") == 0
 128           || strcmp (defs[idx].enumname, "REG") == 0
 129           || strcmp (defs[idx].enumname, "SUBREG") == 0
 130           || strcmp (defs[idx].enumname, "MEM") == 0
 131           || strcmp (defs[idx].enumname, "PC") == 0
 132           || strcmp (defs[idx].enumname, "CC0") == 0
 133           || strcmp (defs[idx].enumname, "RETURN") == 0
 134           || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 0
 135           || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
 136 }
 137
 138 /* Return nonzero if the RTL code given by index IDX is one that we should
 139    generate no macro for at all (because gen_rtx_FOO is never used or
 140    cannot have the obvious interface).  */
 141
 142 static int
 143 excluded_rtx (int idx)
 144 {
 145   return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0)
 146           || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0));
 147 }
 148
 149 /* Place a list of all format specifiers we use into the array FORMAT.  */
 150
 151 static void
 152 find_formats (void)
 153 {
 154   unsigned int i;
 155
 156   for (i = 0; i < NUM_RTX_CODE; i++)
 157     {
 158       const char **f;
 159
 160       if (special_format (defs[i].format))
 161         continue;
 162
 163       for (f = formats; *f; f++)
 164         if (! strcmp (*f, defs[i].format))
 165           break;
 166
 167       if (*f == 0)
 168         *f = defs[i].format;
 169     }
 170 }
 171
 172
 173 /* Generate macros to generate RTL of code IDX using the functions we
 174    write.  */
 175
 176 static void
 177 genmacro (int idx)
 178 {
 179   const char *p;
 180   int i;
 181
 182   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 183      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 184
 185   if (excluded_rtx (idx))
 186     /* Don't define a macro for this code.  */
 187     return;
 188
 189   printf ("#define gen_rtx_%s%s(MODE",
 190            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 191
 192   for (p = defs[idx].format, i = 0; *p != 0; p++)
 193     if (*p != '0')
 194       printf (", ARG%d", i++);
 195
 196   printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",
 197           defs[idx].format, defs[idx].enumname);
 198
 199   for (p = defs[idx].format, i = 0; *p != 0; p++)
 200     if (*p != '0')
 201       printf (", (ARG%d)", i++);
 202
 203   puts (")");
 204 }
 205
 206 /* Generate the code for the function to generate RTL whose
 207    format is FORMAT.  */
 208
 209 static void
 210 gendef (const char *format)
 211 {
 212   const char *p;
 213   int i, j;
 214
 215   /* Start by writing the definition of the function name and the types
 216      of the arguments.  */
 217
 218   printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format);
 219   for (p = format, i = 0; *p != 0; p++)
 220     if (*p != '0')
 221       printf (",\n\t%sarg%d", type_from_format (*p), i++);
 222
 223   puts (" MEM_STAT_DECL)");
 224
 225   /* Now write out the body of the function itself, which allocates
 226      the memory and initializes it.  */
 227   puts ("{");
 228   puts ("  rtx rt;");
 229   puts ("  rt = rtx_alloc_stat (code PASS_MEM_STAT);\n");
 230
 231   puts ("  PUT_MODE (rt, mode);");
 232
 233   for (p = format, i = j = 0; *p ; ++p, ++i)
 234     if (*p != '0')
 235       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 236     else
 237       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 238
 239   puts ("\n  return rt;\n}\n");
 240   printf ("#define gen_rtx_fmt_%s(c, m", format);
 241   for (p = format, i = 0; *p != 0; p++)
 242     if (*p != '0')
 243       printf (", p%i",i++);
 244   printf (")\\\n        gen_rtx_fmt_%s_stat (c, m", format);
 245   for (p = format, i = 0; *p != 0; p++)
 246     if (*p != '0')
 247       printf (", p%i",i++);
 248   printf (" MEM_STAT_INFO)\n\n");
 249 }
 250
 251 /* Generate the documentation header for files we write.  */
 252
 253 static void
 254 genlegend (void)
 255 {
 256   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 257 }
 258
 259 /* Generate the text of the header file we make, genrtl.h.  */
 260
 261 static void
 262 genheader (void)
 263 {
 264   unsigned int i;
 265   const char **fmt;
 266
 267   puts ("#ifndef GCC_GENRTL_H");
 268   puts ("#define GCC_GENRTL_H\n");
 269   puts ("#include \"statistics.h\"\n");
 270
 271   for (fmt = formats; *fmt; ++fmt)
 272     gendef (*fmt);
 273
 274   putchar ('\n');
 275
 276   for (i = 0; i < NUM_RTX_CODE; i++)
 277     if (! special_format (defs[i].format))
 278       genmacro (i);
 279
 280   puts ("\n#endif /* GCC_GENRTL_H */");
 281 }
 282
 283 /* This is the main program.  */
 284
 285 int
 286 main (void)
 287 {
 288   find_formats ();
 289   genlegend ();
 290
 291   genheader ();
 292
 293   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 294     return FATAL_EXIT_CODE;
 295
 296   return SUCCESS_EXIT_CODE;
 297 }