--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/genhooks.c	Sun Aug 21 07:07:55 2011 +0900
@@ -0,0 +1,342 @@
+/* Process target.def to create initialization macros definition in
+   target-hooks-def.h and documentation in target-hooks.texi.
+   Copyright (C) 2009, 2010 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/>.  */
+#include "bconfig.h"
+#include "system.h"
+#include "hashtab.h"
+#include "errors.h"
+
+struct hook_desc { const char *doc, *type, *name, *param, *init; };
+static struct hook_desc hook_array[] = {
+#define HOOK_VECTOR_1(NAME, FRAGMENT) \
+  { 0, 0, #NAME, 0, 0 },
+#define DEFHOOKPOD(NAME, DOC, TYPE, INIT) \
+  { DOC, #TYPE, HOOK_PREFIX #NAME, 0, #INIT },
+#define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) \
+  { DOC, #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT },
+#define DEFHOOK_UNDOC(NAME, DOC, TYPE, PARAMS, INIT) \
+  { "*", #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT },
+#include "target.def"
+#undef DEFHOOK
+};
+
+/* For each @Fcode in the the first paragraph of the documentation string DOC,
+   print an @findex directive.  HOOK_NAME is the name of the hook this bit of
+   documentation pertains to.  */
+static void
+emit_findices (const char *doc, const char *hook_name)
+{
+  const char *end = strstr (doc, "\n\n");
+  const char *fcode;
+
+  while ((fcode = strstr (doc, "@Fcode{")) && (!end || fcode < end))
+    {
+      fcode += strlen ("@Fcode{");
+      doc = strchr (fcode, '}');
+      if (!doc)
+	fatal ("Malformed @Fcode for hook %s\n", hook_name);
+      printf ("@findex %.*s\n", (int) (doc - fcode), fcode);
+      doc = fcode;
+    }
+}
+
+/* Return an upper-case copy of IN.  */
+static char *
+upstrdup (const char *in)
+{
+  char *p, *ret = xstrdup (in);
+  for (p = ret; *p; p++)
+    *p = TOUPPER (*p);
+  return ret;
+}
+
+/* Struct for 'start hooks' which start a sequence of consecutive hooks
+   that are defined in target.def and to be documented in tm.texi.  */
+struct s_hook
+{
+  char *name;
+  int pos;
+};
+
+static hashval_t
+s_hook_hash (const void *p)
+{
+  const struct s_hook *s_hook = (const struct s_hook *)p;
+  return htab_hash_string (s_hook->name);
+}
+
+static int
+s_hook_eq_p (const void *p1, const void *p2)
+{
+  return (strcmp (((const struct s_hook *) p1)->name, 
+		  ((const struct s_hook *) p2)->name) == 0);
+}
+
+/* Read the documentation file with name IN_FNAME, perform substitutions
+   to incorporate informtion from hook_array, and emit the result on stdout.
+   Hooks defined with DEFHOOK / DEFHOOKPOD are emitted at the place of a
+   matching @hook in the input file; if there is no matching @hook, the
+   hook is emitted after the hook that precedes it in target.def .
+   Usually, the emitted hook documentation starts with the hook
+   signature, followed by the string from the doc field.
+   The documentation is bracketed in @deftypefn / @deftypevr and a matching
+   @end.
+   While emitting the doc field, @Fcode is translated to @code, and an
+   @findex entry is added to the affected paragraph.
+   If the doc field starts with '*', the leading '*' is stripped, and the doc
+   field is otherwise emitted unaltered; no function signature/
+   @deftypefn/deftypevr/@end is emitted.
+   In particular, a doc field of "*" means not to emit any ocumentation for
+   this target.def / hook_array entry at all (there might be documentation
+   for this hook in the file named IN_FNAME, though).
+   A doc field of 0 is used to append the hook signature after the previous
+   hook's signture, so that one description can be used for a group of hooks.
+   When the doc field is "", @deftypefn/@deftypevr and the hook signature
+   is emitted, but not the matching @end.  This allows all the free-form
+   documentation to be placed in IN_FNAME, to work around GPL/GFDL
+   licensing incompatibility issues.  */
+static void
+emit_documentation (const char *in_fname)
+{
+  int i, j;
+  char buf[1000];
+  htab_t start_hooks = htab_create (99, s_hook_hash, s_hook_eq_p, (htab_del) 0);
+  FILE *f;
+  bool found_start = false;
+
+  /* Enter all the start hooks in start_hooks.  */
+  f = fopen (in_fname, "r");
+  if (!f)
+    {
+      perror ("");
+      fatal ("Couldn't open input file");
+    }
+  while (fscanf (f, "%*[^@]"), buf[0] = '\0',
+	 fscanf (f, "@%5[^ \n]", buf) != EOF)
+    {
+      void **p;
+      struct s_hook *shp;
+
+      if (strcmp (buf, "hook") != 0)
+	continue;
+      buf[0] = '\0';
+      fscanf (f, "%999s", buf);
+      shp = XNEW (struct s_hook);
+      shp->name = upstrdup (buf);
+      shp->pos = -1;
+      p = htab_find_slot (start_hooks, shp, INSERT);
+      if (*p != HTAB_EMPTY_ENTRY)
+	fatal ("Duplicate placement for hook %s\n", shp->name);
+      *(struct s_hook **) p = shp;
+    }
+  fclose (f);
+  /* For each hook in hook_array, if it is a start hook, store its position.  */
+  for (i = 0; i < (int) (sizeof hook_array / sizeof hook_array[0]); i++)
+    {
+      struct s_hook sh, *shp;
+      void *p;
+
+      if (!hook_array[i].doc || strcmp (hook_array[i].doc, "*") == 0)
+	continue;
+      sh.name = upstrdup (hook_array[i].name);
+      p = htab_find (start_hooks, &sh);
+      if (p)
+	{
+	  shp = (struct s_hook *) p;
+	  if (shp->pos >= 0)
+	    fatal ("Duplicate hook %s\n", sh.name);
+	  shp->pos = i;
+	  found_start = true;
+	}
+      else if (!found_start)
+	fatal ("No place specified to document hook %s\n", sh.name);
+      free (sh.name);
+    }
+  /* Copy input file to stdout, substituting @hook directives with the
+     corresponding hook documentation sequences.  */
+  f = fopen (in_fname, "r");
+  if (!f)
+    {
+      perror ("");
+      fatal ("Couldn't open input file");
+    }
+  for (;;)
+    {
+      struct s_hook sh, *shp;
+      int c = getc (f);
+      char *name;
+
+      if (c == EOF)
+	break;
+      if (c != '@')
+	{
+	  putchar (c);
+	  continue;
+	}
+      buf[0] = '\0';
+      fscanf (f, "%5[^ \n]", buf);
+      if (strcmp (buf, "hook") != 0)
+	{
+	  printf ("@%s", buf);
+	  continue;
+	}
+      fscanf (f, "%999s", buf);
+      sh.name = name = upstrdup (buf);
+      shp = (struct s_hook *) htab_find (start_hooks, &sh);
+      if (!shp || shp->pos < 0)
+	fatal ("No documentation for hook %s\n", sh.name);
+      i = shp->pos;
+      do
+	{
+	  const char *q, *e;
+	  const char *deftype;
+	  const char *doc, *fcode, *p_end;
+
+	  /* A leading '*' means to output the documentation string without
+	     further processing.  */
+	  if (*hook_array[i].doc == '*')
+	    printf ("%s", hook_array[i].doc + 1);
+	  else
+	    {
+	      if (i != shp->pos)
+		printf ("\n\n");
+	      emit_findices (hook_array[i].doc, name);
+
+	      /* Print header.  Function-valued hooks have a parameter list, 
+		 unlike POD-valued ones.  */
+	      deftype = hook_array[i].param ? "deftypefn" : "deftypevr";
+	      printf ("@%s {Target Hook} ", deftype);
+	      if (strchr (hook_array[i].type, ' '))
+		printf ("{%s}", hook_array[i].type);
+	      else
+		printf ("%s", hook_array[i].type);
+	      printf (" %s", name);
+	      if (hook_array[i].param)
+		{
+		  /* Print the parameter list, with the parameter names
+		     enclosed in @var{}.  */
+		  printf (" ");
+		  for (q = hook_array[i].param; (e = strpbrk (q, " *,)"));
+		       q = e + 1)
+		    /* Type names like 'int' are followed by a space, sometimes
+		       also by '*'.  'void' should appear only in "(void)".  */
+		    if (*e == ' ' || *e == '*' || *q == '(')
+		      printf ("%.*s", (int) (e - q + 1), q);
+		    else
+		      printf ("@var{%.*s}%c", (int) (e - q), q, *e);
+		}
+	      /* POD-valued hooks sometimes come in groups with common
+		 documentation.*/
+	      for (j = i + 1;
+		   j < (int) (sizeof hook_array / sizeof hook_array[0])
+		   && hook_array[j].doc == 0 && hook_array[j].type; j++)
+		{
+		  char *namex = upstrdup (hook_array[j].name);
+
+		  printf ("\n@%sx {Target Hook} {%s} %s",
+			  deftype, hook_array[j].type, namex);
+		}
+	      if (hook_array[i].doc[0])
+		{
+		  printf ("\n");
+		  /* Print each documentation paragraph in turn.  */
+		  for (doc = hook_array[i].doc; *doc; doc = p_end)
+		    {
+		      /* Find paragraph end.  */
+		      p_end = strstr (doc, "\n\n");
+		      p_end = (p_end ? p_end + 2 : doc + strlen (doc));
+		      /* Print paragraph, emitting @Fcode as @code.  */
+		      for (; (fcode = strstr (doc, "@Fcode{")) && fcode < p_end;
+			   doc = fcode + 2)
+			printf ("%.*s@", (int) (fcode - doc), doc);
+		      printf ("%.*s", (int) (p_end - doc), doc);
+		      /* Emit function indices for next paragraph.  */
+		      emit_findices (p_end, name);
+		    }
+		  printf ("\n@end %s", deftype);
+		}
+	    }
+	  if (++i >= (int) (sizeof hook_array / sizeof hook_array[0])
+	      || !hook_array[i].doc)
+	    break;
+	  free (name);
+	  sh.name = name = upstrdup (hook_array[i].name);
+	}
+      while (!htab_find (start_hooks, &sh));
+      free (name);
+    }
+}
+
+/* Emit #defines to stdout (this will be redirected to generate
+   target-hook-def.h) which set target hooks initializer macros
+   to their default values.  */
+static void
+emit_init_macros (void)
+{
+  int i;
+  const int MAX_NEST = 2;
+  int print_nest, nest = 0;
+
+  for (print_nest = 0; print_nest <= MAX_NEST; print_nest++)
+    {
+      for (i = 0; i < (int) (sizeof hook_array / sizeof hook_array[0]); i++)
+	{
+	  char *name = upstrdup (hook_array[i].name);
+
+	  if (!hook_array[i].type)
+	    {
+	      if (*name)
+		{
+		  if (nest && nest == print_nest)
+		    printf ("    %s, \\\n", name);
+		  nest++;
+		  if (nest > MAX_NEST)
+		    fatal ("Unexpected nesting of %s\n", name);
+		  if (nest == print_nest)
+		    printf ("\n#define %s \\\n  { \\\n", name);
+		}
+	      else
+		{
+		  if (nest == print_nest)
+		    printf ("  }\n");
+		  nest--;
+		}
+	      continue;
+	    }
+	  if (0 == print_nest)
+	    {
+	      /* Output default definitions of target hooks.  */
+	      printf ("#ifndef %s\n#define %s %s\n#endif\n",
+		      name, name, hook_array[i].init);
+	    }
+	  if (nest == print_nest)
+	    printf ("    %s, \\\n", name);
+	}
+    }
+}
+
+int
+main (int argc, char **argv)
+{
+  if (argc >= 2)
+    emit_documentation (argv[1]);
+  else
+    emit_init_macros ();
+  return 0;
+}