gcc/genconstants.c

   1 /* Generate from machine description:
   2    a series of #define statements, one for each constant named in
   3    a (define_constants ...) pattern.
   4
   5    Copyright (C) 1987-2020 Free Software Foundation, Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 /* This program does not use gensupport.c because it does not need to
  24    look at insn patterns, only (define_constants), and we want to
  25    minimize dependencies.  */
  26
  27 #include "bconfig.h"
  28 #include "system.h"
  29 #include "coretypes.h"
  30 #include "errors.h"
  31 #include "statistics.h"
  32 #include "vec.h"
  33 #include "read-md.h"
  34
  35 /* Called via traverse_md_constants; emit a #define for
  36    the current constant definition.  */
  37
  38 static int
  39 print_md_constant (void **slot, void *info ATTRIBUTE_UNUSED)
  40 {
  41   struct md_constant *def = (struct md_constant *) *slot;
  42
  43   if (!def->parent_enum)
  44     printf ("#define %s %s\n", def->name, def->value);
  45   return 1;
  46 }
  47
  48 /* Called via traverse_enums.  Emit an enum definition for
  49    enum_type *SLOT.  */
  50
  51 static int
  52 print_enum_type (void **slot, void *info ATTRIBUTE_UNUSED)
  53 {
  54   struct enum_type *def;
  55   struct enum_value *value;
  56   char *value_name;
  57
  58   def = (struct enum_type *) *slot;
  59   printf ("\nenum %s {", def->name);
  60   for (value = def->values; value; value = value->next)
  61     {
  62       printf ("\n  %s = %s", value->def->name, value->def->value);
  63       if (value->next)
  64         putc (',', stdout);
  65     }
  66   printf ("\n};\n");
  67
  68   /* Define NUM_<enum>_VALUES to be the largest enum value + 1.  */
  69   value_name = ACONCAT (("num_", def->name, "_values", NULL));
  70   upcase_string (value_name);
  71   printf ("#define %s %d\n", value_name, def->num_values);
  72
  73   /* Declare the array that is generated by genenum.  */
  74   printf ("extern const char *const %s_strings[];\n", def->name);
  75
  76   return 1;
  77 }
  78
  79 int
  80 main (int argc, const char **argv)
  81 {
  82   progname = "genconstants";
  83
  84   noop_reader reader;
  85   if (!reader.read_md_files (argc, argv, NULL))
  86     return (FATAL_EXIT_CODE);
  87
  88   /* Initializing the MD reader has the side effect of loading up
  89      the constants table that we wish to scan.  */
  90
  91   puts ("/* Generated automatically by the program `genconstants'");
  92   puts ("   from the machine description file `md'.  */\n");
  93   puts ("#ifndef GCC_INSN_CONSTANTS_H");
  94   puts ("#define GCC_INSN_CONSTANTS_H\n");
  95
  96   reader.traverse_md_constants (print_md_constant, 0);
  97   reader.traverse_enum_types (print_enum_type, 0);
  98
  99   puts ("\n#endif /* GCC_INSN_CONSTANTS_H */");
 100
 101   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 102     return FATAL_EXIT_CODE;
 103
 104   return SUCCESS_EXIT_CODE;
 105 }