gcc/gencfn-macros.c

   1 /* Generate macros based on the combined_fn enum.
   2    Copyright (C) 2015-2021 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 /* Automatically generate code fragments related to combined_fn.
  21
  22    The program looks for math built-in functions that have float, double
  23    and long double variants, such as {sqrtf, sqrt, sqrtl}, and that may
  24    or may not have an associated internal function as well.  It also looks
  25    for integer built-in functions that have int, long, long long and
  26    intmax_t variants, such as {clz, clzl, clzll, clzimax}, and that
  27    again may or may not have an associated internal function as well.
  28
  29    When run with -c, the generator prints a list of macros such as:
  30
  31       CASE_CFN_SQRT
  32
  33    for each group of functions described above, with 'case CFN_*'
  34    statements for each built-in and internal function in the group.
  35    For example, there are both built-in and internal implementations
  36    of SQRT, so "CASE_CFN_SQRT:" is equivalent to:
  37
  38       case CFN_BUILT_IN_SQRTF:
  39       case CFN_BUILT_IN_SQRT:
  40       case CFN_BUILT_IN_SQRTL:
  41       case CFN_SQRT:
  42
  43    The macros for groups with no internal function drop the last line.
  44
  45    When run with -o, the generator prints a similar list of
  46    define_operator_list directives, for use by match.pd.  Each operator
  47    list starts with the built-in functions, in order of ascending type width.
  48    This is followed by an entry for the internal function, or "null" if there
  49    is no internal function for the group.  For example:
  50
  51      (define_operator_list SQRT
  52          BUILT_IN_SQRTF
  53          BUILT_IN_SQRT
  54          BUILT_IN_SQRTL
  55          IFN_SQRT)
  56
  57    and:
  58
  59      (define_operator_list CABS
  60          BUILT_IN_CABSF
  61          BUILT_IN_CABS
  62          BUILT_IN_CABSL
  63          null)  */
  64
  65 #include "bconfig.h"
  66 #include "system.h"
  67 #include "coretypes.h"
  68 #include "hash-table.h"
  69 #include "hash-set.h"
  70 #include "errors.h"
  71
  72 typedef hash_set <nofree_string_hash> string_set;
  73
  74 /* Add all names in null-terminated list NAMES to SET.  */
  75
  76 static void
  77 add_to_set (string_set *set, const char *const *names)
  78 {
  79   for (unsigned int i = 0; names[i]; ++i)
  80     set->add (names[i]);
  81 }
  82
  83 /* Return true if *BUILTINS contains BUILT_IN_<NAME><SUFFIX> for all
  84    suffixes in null-terminated list SUFFIXES.  */
  85
  86 static bool
  87 is_group (string_set *builtins, const char *name, const char *const *suffixes)
  88 {
  89   for (unsigned int i = 0; suffixes[i]; ++i)
  90     if (!builtins->contains (ACONCAT (("BUILT_IN_", name, suffixes[i], NULL))))
  91       return false;
  92   return true;
  93 }
  94
  95 /* Print a macro for all combined functions related to NAME, with the
  96    null-terminated list of suffixes in SUFFIXES.  INTERNAL_P says whether
  97    CFN_<NAME> also exists.  FLOATN_P is a suffix to the operator name, blank
  98    for normal operators, "_FN" for _Float<N>/_Float<N>X operators only, and
  99    "_ALL" for both the traditional operators and the _Float<N>/_Float<N>X
 100    operators.  */
 101
 102 static void
 103 print_case_cfn (const char *name, bool internal_p,
 104                 const char *const *suffixes, const char *floatn)
 105 {
 106   printf ("#define CASE_CFN_%s%s", name, floatn);
 107   if (internal_p)
 108     printf (" \\\n  case CFN_%s%s", name, floatn);
 109   for (unsigned int i = 0; suffixes[i]; ++i)
 110     printf ("%s \\\n  case CFN_BUILT_IN_%s%s",
 111             internal_p || i > 0 ? ":" : "", name, suffixes[i]);
 112   printf ("\n");
 113 }
 114
 115 /* Print an operator list for all combined functions related to NAME, with the
 116    null-terminated list of suffixes in SUFFIXES.  INTERNAL_P says whether
 117    CFN_<NAME> also exists.  FLOATN_P is a suffix to the operator name, blank
 118    for normal operators, "_FN" for _Float<N>/_Float<N>X operators only, and
 119    "_ALL" for both the traditional operators and the _Float<N>/_Float<N>X
 120    operators.  */
 121
 122 static void
 123 print_define_operator_list (const char *name, bool internal_p,
 124                             const char *const *suffixes,
 125                             const char *floatn)
 126 {
 127   printf ("(define_operator_list %s%s\n", name, floatn);
 128   for (unsigned int i = 0; suffixes[i]; ++i)
 129     printf ("    BUILT_IN_%s%s\n", name, suffixes[i]);
 130   if (internal_p)
 131     printf ("    IFN_%s)\n", name);
 132   else
 133     printf ("    null)\n");
 134 }
 135
 136 const char *const builtin_names[] = {
 137 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 138   #ENUM,
 139 #include "builtins.def"
 140   NULL
 141 };
 142
 143 const char *const internal_fn_flt_names[] = {
 144 #define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
 145   #NAME,
 146 #include "internal-fn.def"
 147   NULL
 148 };
 149
 150 const char *const internal_fn_int_names[] = {
 151 #define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
 152   #NAME,
 153 #include "internal-fn.def"
 154   NULL
 155 };
 156
 157 static const char *const flt_suffixes[] = { "F", "", "L", NULL };
 158 static const char *const fltfn_suffixes[] = { "F16", "F32", "F64", "F128",
 159                                               "F32X", "F64X", "F128X", NULL };
 160 static const char *const fltall_suffixes[] = { "F", "", "L", "F16", "F32",
 161                                                "F64", "F128", "F32X", "F64X",
 162                                                "F128X", NULL };
 163 static const char *const int_suffixes[] = { "", "L", "LL", "IMAX", NULL };
 164
 165 static const char *const *const suffix_lists[] = {
 166   flt_suffixes,
 167   int_suffixes,
 168   NULL
 169 };
 170
 171 int
 172 main (int argc, char **argv)
 173 {
 174   /* Check arguments.  */
 175   progname = argv[0];
 176   if (argc != 2
 177       || argv[1][0] != '-'
 178       || !strchr ("co", argv[1][1])
 179       || argv[1][2])
 180     fatal ("usage: %s [-c|-o] > file", progname);
 181   int type = argv[1][1];
 182
 183   /* Collect the set of built-in and internal functions.  */
 184   string_set builtins;
 185   string_set internal_fns;
 186   add_to_set (&builtins, builtin_names);
 187   add_to_set (&internal_fns, internal_fn_flt_names);
 188   add_to_set (&internal_fns, internal_fn_int_names);
 189
 190   /* Check the functions.  */
 191   for (unsigned int i = 0; internal_fn_flt_names[i]; ++i)
 192     {
 193       const char *name = internal_fn_flt_names[i];
 194       if (!is_group (&builtins, name, flt_suffixes))
 195         error ("DEF_INTERNAL_FLT_FN (%s) has no associated built-in"
 196                " functions", name);
 197     }
 198   for (unsigned int i = 0; internal_fn_int_names[i]; ++i)
 199     {
 200       const char *name = internal_fn_int_names[i];
 201       if (!is_group (&builtins, name, int_suffixes))
 202         error ("DEF_INTERNAL_INT_FN (%s) has no associated built-in"
 203                " functions", name);
 204     }
 205
 206   /* Go through the built-in functions in declaration order, outputting
 207      definitions as appropriate.  */
 208   for (unsigned int i = 0; builtin_names[i]; ++i)
 209     {
 210       const char *name = builtin_names[i];
 211       if (startswith (name, "BUILT_IN_"))
 212         {
 213           const char *root = name + 9;
 214           for (unsigned int j = 0; suffix_lists[j]; ++j)
 215             {
 216               const char *const *const suffix = suffix_lists[j];
 217
 218               if (is_group (&builtins, root, suffix))
 219                 {
 220                   bool internal_p = internal_fns.contains (root);
 221
 222                   if (type == 'c')
 223                     print_case_cfn (root, internal_p, suffix, "");
 224                   else
 225                     print_define_operator_list (root, internal_p, suffix, "");
 226
 227                       /* Support the _Float<N> and _Float<N>X math functions if
 228                          they exist.  We put these out as a separate CFN or
 229                          operator macro, so code can add support or not as
 230                          needed.  We also put out a combined CFN or operator
 231                          macro that includes both the traditional names and the
 232                          _Float<N> and _Float<N>X versions.  */
 233                   if (suffix == flt_suffixes
 234                       && is_group (&builtins, root, fltfn_suffixes))
 235                     {
 236                       if (type == 'c')
 237                         {
 238                           print_case_cfn (root, false, fltfn_suffixes, "_FN");
 239                           print_case_cfn (root, false, fltall_suffixes, "_ALL");
 240                         }
 241                       else
 242                         {
 243                           print_define_operator_list (root, false,
 244                                                       fltfn_suffixes, "_FN");
 245                           print_define_operator_list (root, internal_p,
 246                                                       fltall_suffixes, "_ALL");
 247                         }
 248                     }
 249                 }
 250             }
 251         }
 252     }
 253
 254   if (fflush (stdout) || fclose (stdout) || have_error)
 255     return FATAL_EXIT_CODE;
 256   return SUCCESS_EXIT_CODE;
 257 }