Add gencfn-macros.c

This patch automatically generates case macros such as:

        CASE_CFN_SQRT

for each {F,,L} floating-point built-in function and each {,L,LL,IMAX}
integer built-in function.  The macros match the same built-in
functions as CASE_FLT_FN and CASE_INT_FN but in addition include
the associated internal function, if any.

The idea is to make sure that users of combined_fn don't need to know
which built-in functions have internal-function equivalents.  If we add
a new function to internal-fn.def, all combined_fn users should pick it
up automatically.

The generator wants to use "hash_set <nofree_string_hash>",
so the patch follows hash_map in using the types given by the
traits as the key.  This is a no-op for current users of hash_set.

Tested on x86_64-linux-gnu, aarch64-linux-gnu and arm-linux-gnueabi.

gcc/
	* Makefile.in (HASH_TABLE_H): Add GGC_H.
	(MOSTLYCLEANFILES, generated_files): Add case-fn-macros.h.
	(s-case-cfn-macros, case-cfn-macros.h, build/gencfn-macros.o)
	(build/gencfn-macros$(build_exeext): New rules.
	(genprogerr): Add cfn-macros.
	* hash-set.h (hash_set): Use the traits value_type as the key.
	* gencfn-macros.c: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230476 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 176 insertions, 0 deletions

diff --git a/gcc/gencfn-macros.c b/gcc/gencfn-macros.c
new file mode 100644
index 00000000000..5ee3af0eb5c
--- /dev/null
+++ b/gcc/gencfn-macros.c
@@ -0,0 +1,176 @@
+/* Generate macros based on the combined_fn enum.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Automatically generate code fragments related to combined_fn.
+
+   The program looks for math built-in functions that have float, double
+   and long double variants, such as {sqrtf, sqrt, sqrtl}, and that may
+   or may not have an associated internal function as well.  It also looks
+   for integer built-in functions that have int, long, long long and
+   intmax_t variants, such as {clz, clzl, clzll, clzimax}, and that
+   again may or may not have an associated internal function as well.
+
+   When run with -c, the generator prints a list of macros such as:
+
+      CASE_CFN_SQRT
+
+   for each group of functions described above, with 'case CFN_*'
+   statements for each built-in and internal function in the group.
+   For example, there are both built-in and internal implementations
+   of SQRT, so "CASE_CFN_SQRT:" is equivalent to:
+
+      case CFN_BUILT_IN_SQRTF:
+      case CFN_BUILT_IN_SQRT:
+      case CFN_BUILT_IN_SQRTL:
+      case CFN_SQRT:
+
+   The macros for groups with no internal function drop the last line.  */
+
+#include "bconfig.h"
+#include "system.h"
+#include "coretypes.h"
+#include "hash-table.h"
+#include "hash-set.h"
+#include "errors.h"
+
+typedef hash_set <nofree_string_hash> string_set;
+
+/* Add all names in null-terminated list NAMES to SET.  */
+
+static void
+add_to_set (string_set *set, const char *const *names)
+{
+  for (unsigned int i = 0; names[i]; ++i)
+    set->add (names[i]);
+}
+
+/* Return true if *BUILTINS contains BUILT_IN_<NAME><SUFFIX> for all
+   suffixes in null-terminated list SUFFIXES.  */
+
+static bool
+is_group (string_set *builtins, const char *name, const char *const *suffixes)
+{
+  for (unsigned int i = 0; suffixes[i]; ++i)
+    if (!builtins->contains (ACONCAT (("BUILT_IN_", name, suffixes[i], NULL))))
+      return false;
+  return true;
+}
+
+/* Print a macro for all combined functions related to NAME, with the
+   null-terminated list of suffixes in SUFFIXES.  INTERNAL_P says whether
+   CFN_<NAME> also exists.  */
+
+static void
+print_case_cfn (const char *name, bool internal_p,
+		const char *const *suffixes)
+{
+  printf ("#define CASE_CFN_%s", name);
+  if (internal_p)
+    printf (" \\\n  case CFN_%s", name);
+  for (unsigned int i = 0; suffixes[i]; ++i)
+    printf ("%s \\\n  case CFN_BUILT_IN_%s%s",
+	    internal_p || i > 0 ? ":" : "", name, suffixes[i]);
+  printf ("\n");
+}
+
+const char *const builtin_names[] = {
+#define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
+  #ENUM,
+#include "builtins.def"
+  NULL
+};
+
+const char *const internal_fn_flt_names[] = {
+#define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
+  #NAME,
+#include "internal-fn.def"
+  NULL
+};
+
+const char *const internal_fn_int_names[] = {
+#define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
+  #NAME,
+#include "internal-fn.def"
+  NULL
+};
+
+static const char *const flt_suffixes[] = { "F", "", "L", NULL };
+static const char *const int_suffixes[] = { "", "L", "LL", "IMAX", NULL };
+
+static const char *const *const suffix_lists[] = {
+  flt_suffixes,
+  int_suffixes,
+  NULL
+};
+
+int
+main (int argc, char **argv)
+{
+  /* Check arguments.  */
+  progname = argv[0];
+  if (argc != 2
+      || argv[1][0] != '-'
+      || argv[1][1] != 'c'
+      || argv[1][2])
+    fatal ("usage: %s -c > file", progname);
+
+  /* Collect the set of built-in and internal functions.  */
+  string_set builtins;
+  string_set internal_fns;
+  add_to_set (&builtins, builtin_names);
+  add_to_set (&internal_fns, internal_fn_flt_names);
+  add_to_set (&internal_fns, internal_fn_int_names);
+
+  /* Check the functions.  */
+  for (unsigned int i = 0; internal_fn_flt_names[i]; ++i)
+    {
+      const char *name = internal_fn_flt_names[i];
+      if (!is_group (&builtins, name, flt_suffixes))
+	error ("DEF_INTERNAL_FLT_FN (%s) has no associated built-in"
+	       " functions", name);
+    }
+  for (unsigned int i = 0; internal_fn_int_names[i]; ++i)
+    {
+      const char *name = internal_fn_int_names[i];
+      if (!is_group (&builtins, name, int_suffixes))
+	error ("DEF_INTERNAL_INT_FN (%s) has no associated built-in"
+	       " functions", name);
+    }
+
+  /* Go through the built-in functions in declaration order, outputting
+     definitions as appropriate.  */
+  for (unsigned int i = 0; builtin_names[i]; ++i)
+    {
+      const char *name = builtin_names[i];
+      if (strncmp (name, "BUILT_IN_", 9) == 0)
+	{
+	  const char *root = name + 9;
+	  for (unsigned int j = 0; suffix_lists[j]; ++j)
+	    if (is_group (&builtins, root, suffix_lists[j]))
+	      {
+		bool internal_p = internal_fns.contains (root);
+		print_case_cfn (root, internal_p, suffix_lists[j]);
+	      }
+	}
+    }
+
+  if (fflush (stdout) || fclose (stdout) || have_error)
+    return FATAL_EXIT_CODE;
+  return SUCCESS_EXIT_CODE;
+}