gcc/gengenrtl.c

   1 /* Generate code to allocate RTL structures.
   2    Copyright (C) 1997-2021 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #include "bconfig.h"
  22 #include "system.h"
  23
  24 struct rtx_definition
  25 {
  26   const char *const enumname, *const name, *const format;
  27 };
  28
  29 /* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what
  30    CONST_DOUBLE_FORMAT is because we're not going to be generating
  31    anything for CONST_DOUBLE anyway.  */
  32 #define CONST_DOUBLE_FORMAT ""
  33
  34 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT },
  35
  36 static const struct rtx_definition defs[] =
  37 {
  38 #include "rtl.def"              /* rtl expressions are documented here */
  39 };
  40 #define NUM_RTX_CODE ARRAY_SIZE (defs)
  41
  42 static const char *formats[NUM_RTX_CODE];
  43 \f
  44 /* Decode a format letter into a C type string.  */
  45
  46 static const char *
  47 type_from_format (int c)
  48 {
  49   switch (c)
  50     {
  51     case 'i':
  52       return "int ";
  53
  54     case 'w':
  55       return "HOST_WIDE_INT ";
  56
  57     case 'p':
  58       return "poly_uint16 ";
  59
  60     case 's':
  61       return "const char *";
  62
  63     case 'e':  case 'u':
  64       return "rtx ";
  65
  66     case 'E':
  67       return "rtvec ";
  68     case 't':
  69       return "tree ";
  70     case 'B':
  71       return "basic_block ";
  72     default:
  73       gcc_unreachable ();
  74     }
  75 }
  76
  77 /* Decode a format letter into the proper accessor function.  */
  78
  79 static const char *
  80 accessor_from_format (int c)
  81 {
  82   switch (c)
  83     {
  84     case 'i':
  85       return "XINT";
  86
  87     case 'w':
  88       return "XWINT";
  89
  90     case 's':
  91       return "XSTR";
  92
  93     case 'e':  case 'u':
  94       return "XEXP";
  95
  96     case 'E':
  97       return "XVEC";
  98
  99     case 't':
 100       return "XTREE";
 101
 102     case 'B':
 103       return "XBBDEF";
 104
 105     default:
 106       gcc_unreachable ();
 107     }
 108 }
 109
 110 /* Return nonzero if we should ignore FMT, an RTL format, when making
 111    the list of formats we write routines to create.  */
 112
 113 static int
 114 special_format (const char *fmt)
 115 {
 116   return (strchr (fmt, '*') != 0
 117           || strchr (fmt, 'V') != 0
 118           || strchr (fmt, 'S') != 0
 119           || strchr (fmt, 'n') != 0
 120           || strchr (fmt, 'r') != 0);
 121 }
 122
 123 /* Return true if CODE always has VOIDmode.  */
 124
 125 static inline bool
 126 always_void_p (int idx)
 127 {
 128   return strcmp (defs[idx].enumname, "SET") == 0;
 129 }
 130
 131 /* Return nonzero if the RTL code given by index IDX is one that we should
 132    generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
 133    is a wrapper in emit-rtl.c).  */
 134
 135 static int
 136 special_rtx (int idx)
 137 {
 138   return (strcmp (defs[idx].enumname, "EXPR_LIST") == 0
 139           || strcmp (defs[idx].enumname, "INSN_LIST") == 0
 140           || strcmp (defs[idx].enumname, "INSN") == 0
 141           || strcmp (defs[idx].enumname, "CONST_INT") == 0
 142           || strcmp (defs[idx].enumname, "REG") == 0
 143           || strcmp (defs[idx].enumname, "SUBREG") == 0
 144           || strcmp (defs[idx].enumname, "MEM") == 0
 145           || strcmp (defs[idx].enumname, "PC") == 0
 146           || strcmp (defs[idx].enumname, "CC0") == 0
 147           || strcmp (defs[idx].enumname, "RETURN") == 0
 148           || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 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, "VAR_LOCATION") == 0
 160           || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
 161           || strcmp (defs[idx].enumname, "CONST_WIDE_INT") == 0
 162           || strcmp (defs[idx].enumname, "CONST_POLY_INT") == 0
 163           || strcmp (defs[idx].enumname, "CONST_FIXED") == 0);
 164 }
 165
 166 /* Place a list of all format specifiers we use into the array FORMAT.  */
 167
 168 static void
 169 find_formats (void)
 170 {
 171   unsigned int i;
 172
 173   for (i = 0; i < NUM_RTX_CODE; i++)
 174     {
 175       const char **f;
 176
 177       if (special_format (defs[i].format))
 178         continue;
 179
 180       for (f = formats; *f; f++)
 181         if (! strcmp (*f, defs[i].format))
 182           break;
 183
 184       if (*f == 0)
 185         *f = defs[i].format;
 186     }
 187 }
 188
 189
 190 /* Generate macros to generate RTL of code IDX using the functions we
 191    write.  */
 192
 193 static void
 194 genmacro (int idx)
 195 {
 196   const char *p;
 197   const char *sep = "";
 198   int i;
 199
 200   /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
 201      gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */
 202
 203   if (excluded_rtx (idx))
 204     /* Don't define a macro for this code.  */
 205     return;
 206
 207   bool has_mode_p = !always_void_p (idx);
 208   printf ("#define gen_rtx_%s%s(",
 209            special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
 210   if (has_mode_p)
 211     {
 212       printf ("MODE");
 213       sep = ", ";
 214     }
 215
 216   for (p = defs[idx].format, i = 0; *p != 0; p++)
 217     if (*p != '0')
 218       {
 219         printf ("%sARG%d", sep, i++);
 220         sep = ", ";
 221       }
 222
 223   printf (") \\\n  gen_rtx_fmt_%s (%s, %s",
 224           defs[idx].format, defs[idx].enumname,
 225           has_mode_p ? "(MODE)" : "VOIDmode");
 226
 227   for (p = defs[idx].format, i = 0; *p != 0; p++)
 228     if (*p != '0')
 229       printf (", (ARG%d)", i++);
 230
 231   puts (")");
 232 }
 233
 234 /* Generate the code for functions to generate RTL whose format is FORMAT.  */
 235
 236 static void
 237 gendef (const char *format)
 238 {
 239   const char *p;
 240   int i, j;
 241
 242   /* Write the definition of the init function name and the types
 243      of the arguments.  */
 244
 245   puts ("static inline rtx");
 246   printf ("init_rtx_fmt_%s (rtx rt, machine_mode mode", format);
 247   for (p = format, i = 0; *p != 0; p++)
 248     if (*p != '0')
 249       printf (",\n\t%sarg%d", type_from_format (*p), i++);
 250   puts (")");
 251
 252   /* Now write out the body of the init function itself.  */
 253   puts ("{");
 254   puts ("  PUT_MODE_RAW (rt, mode);");
 255
 256   for (p = format, i = j = 0; *p ; ++p, ++i)
 257     if (*p == '0')
 258       printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);
 259     else if (*p == 'p')
 260       printf ("  SUBREG_BYTE (rt) = arg%d;\n", j++);
 261     else
 262       printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
 263
 264   puts ("  return rt;\n}\n");
 265
 266   /* Write the definition of the gen function name and the types
 267      of the arguments.  */
 268
 269   puts ("static inline rtx");
 270   printf ("gen_rtx_fmt_%s_stat (RTX_CODE code, 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   puts (" MEM_STAT_DECL)");
 275
 276   /* Now write out the body of the function itself, which allocates
 277      the memory and initializes it.  */
 278   puts ("{");
 279   puts ("  rtx rt;\n");
 280
 281   puts ("  rt = rtx_alloc (code PASS_MEM_STAT);");
 282   printf ("  return init_rtx_fmt_%s (rt, mode", format);
 283   for (p = format, i = 0; *p != 0; p++)
 284     if (*p != '0')
 285       printf (", arg%d", i++);
 286   puts (");\n}\n");
 287
 288   /* Write the definition of gen macro.  */
 289
 290   printf ("#define gen_rtx_fmt_%s(c, m", format);
 291   for (p = format, i = 0; *p != 0; p++)
 292     if (*p != '0')
 293       printf (", arg%d", i++);
 294   printf (") \\\n  gen_rtx_fmt_%s_stat ((c), (m)", format);
 295   for (p = format, i = 0; *p != 0; p++)
 296     if (*p != '0')
 297       printf (", (arg%d)", i++);
 298   printf (" MEM_STAT_INFO)\n\n");
 299
 300   /* Write the definition of alloca macro.  */
 301
 302   printf ("#define alloca_rtx_fmt_%s(c, m", format);
 303   for (p = format, i = 0; *p != 0; p++)
 304     if (*p != '0')
 305       printf (", arg%d", i++);
 306   printf (") \\\n  init_rtx_fmt_%s (rtx_alloca ((c)), (m)", format);
 307   for (p = format, i = 0; *p != 0; p++)
 308     if (*p != '0')
 309       printf (", (arg%d)", i++);
 310   printf (")\n\n");
 311 }
 312
 313 /* Generate the documentation header for files we write.  */
 314
 315 static void
 316 genlegend (void)
 317 {
 318   puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");
 319 }
 320
 321 /* Generate the text of the header file we make, genrtl.h.  */
 322
 323 static void
 324 genheader (void)
 325 {
 326   unsigned int i;
 327   const char **fmt;
 328
 329   puts ("#ifndef GCC_GENRTL_H");
 330   puts ("#define GCC_GENRTL_H\n");
 331   puts ("#include \"statistics.h\"\n");
 332
 333   for (fmt = formats; *fmt; ++fmt)
 334     gendef (*fmt);
 335
 336   putchar ('\n');
 337
 338   for (i = 0; i < NUM_RTX_CODE; i++)
 339     if (! special_format (defs[i].format))
 340       genmacro (i);
 341
 342   puts ("\n#endif /* GCC_GENRTL_H */");
 343 }
 344
 345 /* This is the main program.  */
 346
 347 int
 348 main (void)
 349 {
 350   find_formats ();
 351   genlegend ();
 352
 353   genheader ();
 354
 355   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 356     return FATAL_EXIT_CODE;
 357
 358   return SUCCESS_EXIT_CODE;
 359 }