--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/gengtype.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,3639 @@
+/* Process source files and output type information.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+   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 "gengtype.h"
+#include "errors.h"	/* for fatal */
+#include "double-int.h"
+
+/* Data types, macros, etc. used only in this file.  */
+
+/* Kinds of types we can understand.  */
+enum typekind {
+  TYPE_SCALAR,
+  TYPE_STRING,
+  TYPE_STRUCT,
+  TYPE_UNION,
+  TYPE_POINTER,
+  TYPE_ARRAY,
+  TYPE_LANG_STRUCT,
+  TYPE_PARAM_STRUCT
+};
+
+typedef unsigned lang_bitmap;
+
+/* A way to pass data through to the output end.  */
+struct options
+{
+  struct options *next;
+  const char *name;
+  const char *info;
+};
+
+/* Option data for the 'nested_ptr' option.  */
+struct nested_ptr_data
+{
+  type_p type;
+  const char *convert_to;
+  const char *convert_from;
+};
+
+/* A name and a type.  */
+struct pair
+{
+  pair_p next;
+  const char *name;
+  type_p type;
+  struct fileloc line;
+  options_p opt;
+};
+
+#define NUM_PARAM 10
+
+/* A description of a type.  */
+enum gc_used_enum
+  {
+    GC_UNUSED = 0,
+    GC_USED,
+    GC_MAYBE_POINTED_TO,
+    GC_POINTED_TO
+  };
+
+struct type
+{
+  enum typekind kind;
+  type_p next;
+  type_p pointer_to;
+  enum gc_used_enum gc_used;
+  union {
+    type_p p;
+    struct {
+      const char *tag;
+      struct fileloc line;
+      pair_p fields;
+      options_p opt;
+      lang_bitmap bitmap;
+      type_p lang_struct;
+    } s;
+    bool scalar_is_char;
+    struct {
+      type_p p;
+      const char *len;
+    } a;
+    struct {
+      type_p stru;
+      type_p param[NUM_PARAM];
+      struct fileloc line;
+    } param_struct;
+  } u;
+};
+
+#define UNION_P(x)					\
+ ((x)->kind == TYPE_UNION || 				\
+  ((x)->kind == TYPE_LANG_STRUCT 			\
+   && (x)->u.s.lang_struct->kind == TYPE_UNION))
+#define UNION_OR_STRUCT_P(x)			\
+ ((x)->kind == TYPE_UNION 			\
+  || (x)->kind == TYPE_STRUCT 			\
+  || (x)->kind == TYPE_LANG_STRUCT)
+
+/* Structure representing an output file.  */
+struct outf
+{
+  struct outf *next;
+  const char *name;
+  size_t buflength;
+  size_t bufused;
+  char *buf;
+};
+typedef struct outf * outf_p;
+
+/* An output file, suitable for definitions, that can see declarations
+   made in INPUT_FILE and is linked into every language that uses
+   INPUT_FILE.  */
+extern outf_p get_output_file_with_visibility
+   (const char *input_file);
+const char *get_output_file_name (const char *);
+
+/* Print, like fprintf, to O.  */
+static void oprintf (outf_p o, const char *S, ...)
+     ATTRIBUTE_PRINTF_2;
+
+/* The list of output files.  */
+static outf_p output_files;
+
+/* The output header file that is included into pretty much every
+   source file.  */
+static outf_p header_file;
+
+/* Source directory.  */
+static const char *srcdir;
+
+/* Length of srcdir name.  */
+static size_t srcdir_len = 0;
+
+static outf_p create_file (const char *, const char *);
+
+static const char * get_file_basename (const char *);
+static const char * get_file_realbasename (const char *);
+static const char * get_file_srcdir_relative_path (const char *);
+
+static int get_prefix_langdir_index (const char *);
+static const char * get_file_langdir (const char *);
+
+
+/* Nonzero iff an error has occurred.  */
+bool hit_error = false;
+
+static void gen_rtx_next (void);
+static void write_rtx_next (void);
+static void open_base_files (void);
+static void close_output_files (void);
+
+/* Report an error at POS, printing MSG.  */
+
+void
+error_at_line (struct fileloc *pos, const char *msg, ...)
+{
+  va_list ap;
+
+  va_start (ap, msg);
+
+  fprintf (stderr, "%s:%d: ", pos->file, pos->line);
+  vfprintf (stderr, msg, ap);
+  fputc ('\n', stderr);
+  hit_error = true;
+
+  va_end (ap);
+}
+
+/* asprintf, but produces fatal message on out-of-memory.  */
+char *
+xasprintf (const char *format, ...)
+{
+  int n;
+  char *result;
+  va_list ap;
+
+  va_start (ap, format);
+  n = vasprintf (&result, format, ap);
+  if (result == NULL || n < 0)
+    fatal ("out of memory");
+  va_end (ap);
+
+  return result;
+}
+
+/* Input file handling. */
+
+/* Table of all input files.  */
+static const char **gt_files;
+static size_t num_gt_files;
+
+/* A number of places use the name of this file for a location for
+   things that we can't rely on the source to define.  Make sure we
+   can still use pointer comparison on filenames.  */
+static const char this_file[] = __FILE__;
+
+/* Vector of per-language directories.  */
+static const char **lang_dir_names;
+static size_t num_lang_dirs;
+
+/* An array of output files suitable for definitions.  There is one
+   BASE_FILES entry for each language.  */
+static outf_p *base_files;
+
+/* Return a bitmap which has bit `1 << BASE_FILE_<lang>' set iff
+   INPUT_FILE is used by <lang>.
+
+   This function should be written to assume that a file _is_ used
+   if the situation is unclear.  If it wrongly assumes a file _is_ used,
+   a linker error will result.  If it wrongly assumes a file _is not_ used,
+   some GC roots may be missed, which is a much harder-to-debug problem.
+
+   The relevant bitmap is stored immediately before the file's name in the
+   buffer set up by read_input_list.  It may be unaligned, so we have to
+   read it byte-by-byte.  */
+
+static lang_bitmap
+get_lang_bitmap (const char *gtfile)
+{
+
+  if (gtfile == this_file)
+    /* Things defined in this file are universal.  */
+    return (((lang_bitmap)1) << num_lang_dirs) - 1;
+  else
+    {
+      lang_bitmap n = 0;
+      int i;
+      for (i = -(int) sizeof (lang_bitmap); i < 0; i++)
+	n = (n << CHAR_BIT) + (unsigned char)gtfile[i];
+      return n;
+    }
+}
+
+/* Set the bitmap returned by get_lang_bitmap.  The only legitimate
+   caller of this function is read_input_list.  */
+static void
+set_lang_bitmap (char *gtfile, lang_bitmap n)
+{
+  int i;
+  for (i = -1; i >= -(int) sizeof (lang_bitmap); i--)
+    {
+      gtfile[i] = n & ((1U << CHAR_BIT)-1);
+      n >>= CHAR_BIT;
+    }
+}
+
+/* Scan the input file, LIST, and determine how much space we need to
+   store strings in.  Also, count the number of language directories
+   and files.  The numbers returned are overestimates as they does not
+   consider repeated files.  */
+static size_t
+measure_input_list (FILE *list)
+{
+  size_t n = 0;
+  int c;
+  bool atbol = true;
+  num_lang_dirs = 0;
+  num_gt_files = 0;
+  while ((c = getc (list)) != EOF)
+    {
+      n++;
+      if (atbol)
+	{
+	  if (c == '[')
+	    num_lang_dirs++;
+	  else
+	    {
+	      /* Add space for a lang_bitmap before the input file name.  */
+	      n += sizeof (lang_bitmap);
+	      num_gt_files++;
+	    }
+	  atbol = false;
+	}
+
+      if (c == '\n')
+	atbol = true;
+    }
+
+  rewind (list);
+  return n;
+}
+
+/* Read one input line from LIST to HEREP (which is updated).  A
+   pointer to the string is returned via LINEP.  If it was a language
+   subdirectory in square brackets, strip off the square brackets and
+   return true.  Otherwise, leave space before the string for a
+   lang_bitmap, and return false.  At EOF, returns false, does not
+   touch *HEREP, and sets *LINEP to NULL.  POS is used for
+   diagnostics.  */
+static bool
+read_input_line (FILE *list, char **herep, char **linep,
+		 struct fileloc *pos)
+{
+  char *here = *herep;
+  char *line;
+  int c = getc (list);
+
+  /* Read over whitespace.  */
+  while (c == '\n' || c == ' ')
+    c = getc (list);
+
+  if (c == EOF)
+    {
+      *linep = 0;
+      return false;
+    }
+  else if (c == '[')
+    {
+      /* No space for a lang_bitmap is necessary.  Discard the '['. */
+      c = getc (list);
+      line = here;
+      while (c != ']' && c != '\n' && c != EOF)
+	{
+	  *here++ = c;
+	  c = getc (list);
+	}
+      *here++ = '\0';
+
+      if (c == ']')
+	{
+	  c = getc (list);  /* eat what should be a newline */
+	  if (c != '\n' && c != EOF)
+	    error_at_line (pos, "junk on line after language tag [%s]", line);
+	}
+      else
+	error_at_line (pos, "missing close bracket for language tag [%s", line);
+
+      *herep = here;
+      *linep = line;
+      return true;
+    }
+  else
+    {
+      /* Leave space for a lang_bitmap.  */
+      memset (here, 0, sizeof (lang_bitmap));
+      here += sizeof (lang_bitmap);
+      line = here;
+      do
+	{
+	  *here++ = c;
+	  c = getc (list);
+	}
+      while (c != EOF && c != '\n');
+      *here++ = '\0';
+      *herep = here;
+      *linep = line;
+      return false;
+    }
+}
+
+/* Read the list of input files from LIST and compute all of the
+   relevant tables.  There is one file per line of the list.  At
+   first, all the files on the list are language-generic, but
+   eventually a line will appear which is the name of a language
+   subdirectory in square brackets, like this: [cp].  All subsequent
+   files are specific to that language, until another language
+   subdirectory tag appears.  Files can appear more than once, if
+   they apply to more than one language.  */
+static void
+read_input_list (const char *listname)
+{
+  FILE *list = fopen (listname, "r");
+  if (!list)
+    fatal ("cannot open %s: %s", listname, strerror (errno));
+  else
+    {
+      struct fileloc epos;
+      size_t bufsz = measure_input_list (list);
+      char *buf = XNEWVEC (char, bufsz);
+      char *here = buf;
+      char *committed = buf;
+      char *limit = buf + bufsz;
+      char *line;
+      bool is_language;
+      size_t langno = 0;
+      size_t nfiles = 0;
+      lang_bitmap curlangs = (1 << num_lang_dirs) - 1;
+
+      epos.file = listname;
+      epos.line = 0;
+
+      lang_dir_names = XNEWVEC (const char *, num_lang_dirs);
+      gt_files = XNEWVEC (const char *, num_gt_files);
+
+      for (;;)
+	{
+	next_line:
+	  epos.line++;
+	  committed = here;
+	  is_language = read_input_line (list, &here, &line, &epos);
+	  gcc_assert (here <= limit);
+	  if (line == 0)
+	    break;
+	  else if (is_language)
+	    {
+	      size_t i;
+	      gcc_assert (langno <= num_lang_dirs);
+	      for (i = 0; i < langno; i++)
+		if (strcmp (lang_dir_names[i], line) == 0)
+		  {
+		    error_at_line (&epos, "duplicate language tag [%s]", line);
+		    curlangs = 1 << i;
+		    here = committed;
+		    goto next_line;
+		  }
+
+	      curlangs = 1 << langno;
+	      lang_dir_names[langno++] = line;
+	    }
+	  else
+	    {
+	      size_t i;
+	      gcc_assert (nfiles <= num_gt_files);
+	      for (i = 0; i < nfiles; i++)
+		if (strcmp (gt_files[i], line) == 0)
+		  {
+		    /* Throw away the string we just read, and add the
+		       current language to the existing string's bitmap.  */
+		    lang_bitmap bmap = get_lang_bitmap (gt_files[i]);
+		    if (bmap & curlangs)
+		      error_at_line (&epos, "file %s specified more than once "
+				     "for language %s", line, langno == 0
+				     ? "(all)"
+				     : lang_dir_names[langno - 1]);
+
+		    bmap |= curlangs;
+		    set_lang_bitmap (CONST_CAST(char *, gt_files[i]), bmap);
+		    here = committed;
+		    goto next_line;
+		  }
+
+	      set_lang_bitmap (line, curlangs);
+	      gt_files[nfiles++] = line;
+	    }
+	}
+      /* Update the global counts now that we know accurately how many
+	 things there are.  (We do not bother resizing the arrays down.)  */
+      num_lang_dirs = langno;
+      num_gt_files = nfiles;
+    }
+
+  /* Sanity check: any file that resides in a language subdirectory
+     (e.g. 'cp') ought to belong to the corresponding language.
+     ??? Still true if for instance ObjC++ is enabled and C++ isn't?
+     (Can you even do that?  Should you be allowed to?)  */
+  {
+    size_t f;
+    for (f = 0; f < num_gt_files; f++)
+      {
+	lang_bitmap bitmap = get_lang_bitmap (gt_files[f]);
+	const char *basename = get_file_basename (gt_files[f]);
+	const char *slashpos = strchr (basename, '/');
+
+	if (slashpos)
+	  {
+	    size_t l;
+	    for (l = 0; l < num_lang_dirs; l++)
+	      if ((size_t)(slashpos - basename) == strlen (lang_dir_names [l])
+		  && memcmp (basename, lang_dir_names[l],
+			     strlen (lang_dir_names[l])) == 0)
+		{
+		  if (!(bitmap & (1 << l)))
+		    error ("%s is in language directory '%s' but is not "
+			   "tagged for that language",
+			   basename, lang_dir_names[l]);
+		  break;
+		}
+          }
+      }
+  }
+
+  if (ferror (list))
+    fatal ("error reading %s: %s", listname, strerror (errno));
+
+  fclose (list);
+}
+
+
+
+/* The one and only TYPE_STRING.  */
+
+static struct type string_type = {
+  TYPE_STRING, 0, 0, GC_USED, {0}
+};
+
+/* The two and only TYPE_SCALARs.  Their u.scalar_is_char flags are
+   set to appropriate values at the beginning of main.  */
+
+static struct type scalar_nonchar = {
+  TYPE_SCALAR, 0, 0, GC_USED, {0}
+};
+static struct type scalar_char = {
+  TYPE_SCALAR, 0, 0, GC_USED, {0}
+};
+
+/* Lists of various things.  */
+
+static pair_p typedefs;
+static type_p structures;
+static type_p param_structs;
+static pair_p variables;
+
+static type_p find_param_structure
+  (type_p t, type_p param[NUM_PARAM]);
+static type_p adjust_field_tree_exp (type_p t, options_p opt);
+static type_p adjust_field_rtx_def (type_p t, options_p opt);
+
+/* Define S as a typedef to T at POS.  */
+
+void
+do_typedef (const char *s, type_p t, struct fileloc *pos)
+{
+  pair_p p;
+
+  /* temporary kludge - gengtype doesn't handle conditionals or
+     macros.  Ignore any attempt to typedef CUMULATIVE_ARGS, unless it
+     is coming from this file (main() sets them up with safe dummy
+     definitions).  */
+  if (!strcmp (s, "CUMULATIVE_ARGS") && pos->file != this_file)
+    return;
+
+  for (p = typedefs; p != NULL; p = p->next)
+    if (strcmp (p->name, s) == 0)
+      {
+	if (p->type != t)
+	  {
+	    error_at_line (pos, "type `%s' previously defined", s);
+	    error_at_line (&p->line, "previously defined here");
+	  }
+	return;
+      }
+
+  p = XNEW (struct pair);
+  p->next = typedefs;
+  p->name = s;
+  p->type = t;
+  p->line = *pos;
+  typedefs = p;
+}
+
+/* Define S as a typename of a scalar.  Cannot be used to define
+   typedefs of 'char'.  Note: is also used for pointer-to-function
+   typedefs (which are therefore not treated as pointers).  */
+
+void
+do_scalar_typedef (const char *s, struct fileloc *pos)
+{
+  do_typedef (s, &scalar_nonchar, pos);
+}
+
+/* Return the type previously defined for S.  Use POS to report errors.  */
+
+type_p
+resolve_typedef (const char *s, struct fileloc *pos)
+{
+  pair_p p;
+  for (p = typedefs; p != NULL; p = p->next)
+    if (strcmp (p->name, s) == 0)
+      return p->type;
+  error_at_line (pos, "unidentified type `%s'", s);
+  return &scalar_nonchar;  /* treat as "int" */
+}
+
+/* Create and return a new structure with tag NAME (or a union iff
+   ISUNION is nonzero), at POS with fields FIELDS and options O.  */
+
+type_p
+new_structure (const char *name, int isunion, struct fileloc *pos,
+	       pair_p fields, options_p o)
+{
+  type_p si;
+  type_p s = NULL;
+  lang_bitmap bitmap = get_lang_bitmap (pos->file);
+
+  /* temporary kludge - gengtype doesn't handle conditionals or
+     macros.  Ignore any attempt to define struct location_s, unless
+     it is coming from this file (main() sets it up safely). */
+  if (!strcmp (name, "location_s") && !isunion
+      && pos->file != this_file)
+    return find_structure (name, 0);
+
+  for (si = structures; si != NULL; si = si->next)
+    if (strcmp (name, si->u.s.tag) == 0
+	&& UNION_P (si) == isunion)
+      {
+	type_p ls = NULL;
+	if (si->kind == TYPE_LANG_STRUCT)
+	  {
+	    ls = si;
+
+	    for (si = ls->u.s.lang_struct; si != NULL; si = si->next)
+	      if (si->u.s.bitmap == bitmap)
+		s = si;
+	  }
+	else if (si->u.s.line.file != NULL && si->u.s.bitmap != bitmap)
+	  {
+	    ls = si;
+	    si = XCNEW (struct type);
+	    memcpy (si, ls, sizeof (struct type));
+	    ls->kind = TYPE_LANG_STRUCT;
+	    ls->u.s.lang_struct = si;
+	    ls->u.s.fields = NULL;
+	    si->next = NULL;
+	    si->pointer_to = NULL;
+	    si->u.s.lang_struct = ls;
+	  }
+	else
+	  s = si;
+
+	if (ls != NULL && s == NULL)
+	  {
+	    s = XCNEW (struct type);
+	    s->next = ls->u.s.lang_struct;
+	    ls->u.s.lang_struct = s;
+	    s->u.s.lang_struct = ls;
+	  }
+	break;
+      }
+
+  if (s == NULL)
+    {
+      s = XCNEW (struct type);
+      s->next = structures;
+      structures = s;
+    }
+
+  if (s->u.s.line.file != NULL
+      || (s->u.s.lang_struct && (s->u.s.lang_struct->u.s.bitmap & bitmap)))
+    {
+      error_at_line (pos, "duplicate definition of '%s %s'",
+		     isunion ? "union" : "struct", s->u.s.tag);
+      error_at_line (&s->u.s.line, "previous definition here");
+    }
+
+  s->kind = isunion ? TYPE_UNION : TYPE_STRUCT;
+  s->u.s.tag = name;
+  s->u.s.line = *pos;
+  s->u.s.fields = fields;
+  s->u.s.opt = o;
+  s->u.s.bitmap = bitmap;
+  if (s->u.s.lang_struct)
+    s->u.s.lang_struct->u.s.bitmap |= bitmap;
+
+  /* Reset location_s's location to input.h so that we know where to
+     write out its mark routine.  */
+  if (!strcmp (name, "location_s") && !isunion
+      && pos->file == this_file)
+    {
+      size_t n;
+      for (n = 0; n < num_gt_files; n++)
+	if (!strcmp (gt_files[n] + strlen (gt_files[n]) - strlen ("input.h"),
+		     "input.h"))
+	  {
+	    s->u.s.line.file = gt_files[n];
+	    break;
+	  }
+    }
+
+    return s;
+}
+
+/* Return the previously-defined structure with tag NAME (or a union
+   iff ISUNION is nonzero), or a new empty structure or union if none
+   was defined previously.  */
+
+type_p
+find_structure (const char *name, int isunion)
+{
+  type_p s;
+
+  for (s = structures; s != NULL; s = s->next)
+    if (strcmp (name, s->u.s.tag) == 0
+	&& UNION_P (s) == isunion)
+      return s;
+
+  s = XCNEW (struct type);
+  s->next = structures;
+  structures = s;
+  s->kind = isunion ? TYPE_UNION : TYPE_STRUCT;
+  s->u.s.tag = name;
+  structures = s;
+  return s;
+}
+
+/* Return the previously-defined parameterized structure for structure
+   T and parameters PARAM, or a new parameterized empty structure or
+   union if none was defined previously.  */
+
+static type_p
+find_param_structure (type_p t, type_p param[NUM_PARAM])
+{
+  type_p res;
+
+  for (res = param_structs; res; res = res->next)
+    if (res->u.param_struct.stru == t
+	&& memcmp (res->u.param_struct.param, param,
+		   sizeof (type_p) * NUM_PARAM) == 0)
+      break;
+  if (res == NULL)
+    {
+      res = XCNEW (struct type);
+      res->kind = TYPE_PARAM_STRUCT;
+      res->next = param_structs;
+      param_structs = res;
+      res->u.param_struct.stru = t;
+      memcpy (res->u.param_struct.param, param, sizeof (type_p) * NUM_PARAM);
+    }
+  return res;
+}
+
+/* Return a scalar type with name NAME.  */
+
+type_p
+create_scalar_type (const char *name)
+{
+  if (!strcmp (name, "char") || !strcmp (name, "unsigned char"))
+    return &scalar_char;
+  else
+    return &scalar_nonchar;
+}
+
+/* Return a pointer to T.  */
+
+type_p
+create_pointer (type_p t)
+{
+  if (! t->pointer_to)
+    {
+      type_p r = XCNEW (struct type);
+      r->kind = TYPE_POINTER;
+      r->u.p = t;
+      t->pointer_to = r;
+    }
+  return t->pointer_to;
+}
+
+/* Return an array of length LEN.  */
+
+type_p
+create_array (type_p t, const char *len)
+{
+  type_p v;
+
+  v = XCNEW (struct type);
+  v->kind = TYPE_ARRAY;
+  v->u.a.p = t;
+  v->u.a.len = len;
+  return v;
+}
+
+/* Return an options structure with name NAME and info INFO.  NEXT is the
+   next option in the chain.  */
+
+options_p
+create_option (options_p next, const char *name, const void *info)
+{
+  options_p o = XNEW (struct options);
+  o->next = next;
+  o->name = name;
+  o->info = (const char*) info;
+  return o;
+}
+
+/* Return an options structure for a "nested_ptr" option.  */
+options_p
+create_nested_ptr_option (options_p next, type_p t,
+			  const char *to, const char *from)
+{
+  struct nested_ptr_data *d = XNEW (struct nested_ptr_data);
+
+  d->type = adjust_field_type (t, 0);
+  d->convert_to = to;
+  d->convert_from = from;
+  return create_option (next, "nested_ptr", d);
+}
+
+/* Add a variable named S of type T with options O defined at POS,
+   to `variables'.  */
+
+void
+note_variable (const char *s, type_p t, options_p o, struct fileloc *pos)
+{
+  pair_p n;
+  n = XNEW (struct pair);
+  n->name = s;
+  n->type = t;
+  n->line = *pos;
+  n->opt = o;
+  n->next = variables;
+  variables = n;
+}
+
+/* Most-general structure field creator.  */
+static pair_p
+create_field_all (pair_p next, type_p type, const char *name, options_p opt,
+		  const char *file, int line)
+{
+  pair_p field;
+
+  field = XNEW (struct pair);
+  field->next = next;
+  field->type = type;
+  field->name = name;
+  field->opt = opt;
+  field->line.file = file;
+  field->line.line = line;
+  return field;
+}
+
+/* Create a field that came from the source code we are scanning,
+   i.e. we have a 'struct fileloc', and possibly options; also,
+   adjust_field_type should be called.  */
+pair_p
+create_field_at (pair_p next, type_p type, const char *name, options_p opt,
+		 struct fileloc *pos)
+{
+  return create_field_all (next, adjust_field_type (type, opt),
+			   name, opt, pos->file, pos->line);
+}
+
+/* Create a fake field with the given type and name.  NEXT is the next
+   field in the chain.  */
+#define create_field(next,type,name) \
+    create_field_all(next,type,name, 0, this_file, __LINE__)
+
+/* Like create_field, but the field is only valid when condition COND
+   is true.  */
+
+static pair_p
+create_optional_field_ (pair_p next, type_p type, const char *name,
+			const char *cond, int line)
+{
+  static int id = 1;
+  pair_p union_fields;
+  type_p union_type;
+
+  /* Create a fake union type with a single nameless field of type TYPE.
+     The field has a tag of "1".  This allows us to make the presence
+     of a field of type TYPE depend on some boolean "desc" being true.  */
+  union_fields = create_field (NULL, type, "");
+  union_fields->opt = create_option (union_fields->opt, "dot", "");
+  union_fields->opt = create_option (union_fields->opt, "tag", "1");
+  union_type = new_structure (xasprintf ("%s_%d", "fake_union", id++), 1,
+			      &lexer_line, union_fields, NULL);
+
+  /* Create the field and give it the new fake union type.  Add a "desc"
+     tag that specifies the condition under which the field is valid.  */
+  return create_field_all (next, union_type, name,
+			   create_option (0, "desc", cond),
+			   this_file, line);
+}
+#define create_optional_field(next,type,name,cond)	\
+       create_optional_field_(next,type,name,cond,__LINE__)
+
+/* Reverse a linked list of 'struct pair's in place.  */
+pair_p
+nreverse_pairs (pair_p list)
+{
+  pair_p prev = 0, p, next;
+  for (p = list; p; p = next)
+    {
+      next = p->next;
+      p->next = prev;
+      prev = p;
+    }
+  return prev;
+}
+
+
+/* We don't care how long a CONST_DOUBLE is.  */
+#define CONST_DOUBLE_FORMAT "ww"
+/* We don't want to see codes that are only for generator files.  */
+#undef GENERATOR_FILE
+
+enum rtx_code {
+#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
+#include "rtl.def"
+#undef DEF_RTL_EXPR
+  NUM_RTX_CODE
+};
+
+static const char * const rtx_name[NUM_RTX_CODE] = {
+#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   NAME ,
+#include "rtl.def"
+#undef DEF_RTL_EXPR
+};
+
+static const char * const rtx_format[NUM_RTX_CODE] = {
+#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   FORMAT ,
+#include "rtl.def"
+#undef DEF_RTL_EXPR
+};
+
+static int rtx_next_new[NUM_RTX_CODE];
+
+/* We also need codes and names for insn notes (not register notes).
+   Note that we do *not* bias the note values here.  */
+enum insn_note {
+#define DEF_INSN_NOTE(NAME) NAME,
+#include "insn-notes.def"
+#undef DEF_INSN_NOTE
+
+  NOTE_INSN_MAX
+};
+
+/* We must allocate one more entry here, as we use NOTE_INSN_MAX as the
+   default field for line number notes.  */
+static const char *const note_insn_name[NOTE_INSN_MAX+1] = {
+#define DEF_INSN_NOTE(NAME) #NAME,
+#include "insn-notes.def"
+#undef DEF_INSN_NOTE
+};
+
+#undef CONST_DOUBLE_FORMAT
+#define GENERATOR_FILE
+
+/* Generate the contents of the rtx_next array.  This really doesn't belong
+   in gengtype at all, but it's needed for adjust_field_rtx_def.  */
+
+static void
+gen_rtx_next (void)
+{
+  int i;
+  for (i = 0; i < NUM_RTX_CODE; i++)
+    {
+      int k;
+
+      rtx_next_new[i] = -1;
+      if (strncmp (rtx_format[i], "iuu", 3) == 0)
+	rtx_next_new[i] = 2;
+      else if (i == COND_EXEC || i == SET || i == EXPR_LIST || i == INSN_LIST)
+	rtx_next_new[i] = 1;
+      else
+	for (k = strlen (rtx_format[i]) - 1; k >= 0; k--)
+	  if (rtx_format[i][k] == 'e' || rtx_format[i][k] == 'u')
+	    rtx_next_new[i] = k;
+    }
+}
+
+/* Write out the contents of the rtx_next array.  */
+static void
+write_rtx_next (void)
+{
+  outf_p f = get_output_file_with_visibility (NULL);
+  int i;
+
+  oprintf (f, "\n/* Used to implement the RTX_NEXT macro.  */\n");
+  oprintf (f, "const unsigned char rtx_next[NUM_RTX_CODE] = {\n");
+  for (i = 0; i < NUM_RTX_CODE; i++)
+    if (rtx_next_new[i] == -1)
+      oprintf (f, "  0,\n");
+    else
+      oprintf (f,
+	       "  RTX_HDR_SIZE + %d * sizeof (rtunion),\n",
+	       rtx_next_new[i]);
+  oprintf (f, "};\n");
+}
+
+/* Handle `special("rtx_def")'.  This is a special case for field
+   `fld' of struct rtx_def, which is an array of unions whose values
+   are based in a complex way on the type of RTL.  */
+
+static type_p
+adjust_field_rtx_def (type_p t, options_p ARG_UNUSED (opt))
+{
+  pair_p flds = NULL;
+  options_p nodot;
+  int i;
+  type_p rtx_tp, rtvec_tp, tree_tp, mem_attrs_tp, note_union_tp, scalar_tp;
+  type_p bitmap_tp, basic_block_tp, reg_attrs_tp, constant_tp, symbol_union_tp;
+
+  if (t->kind != TYPE_UNION)
+    {
+      error_at_line (&lexer_line,
+		     "special `rtx_def' must be applied to a union");
+      return &string_type;
+    }
+
+  nodot = create_option (NULL, "dot", "");
+
+  rtx_tp = create_pointer (find_structure ("rtx_def", 0));
+  rtvec_tp = create_pointer (find_structure ("rtvec_def", 0));
+  tree_tp = create_pointer (find_structure ("tree_node", 1));
+  mem_attrs_tp = create_pointer (find_structure ("mem_attrs", 0));
+  reg_attrs_tp = create_pointer (find_structure ("reg_attrs", 0));
+  bitmap_tp = create_pointer (find_structure ("bitmap_element_def", 0));
+  basic_block_tp = create_pointer (find_structure ("basic_block_def", 0));
+  constant_tp = create_pointer (find_structure ("constant_descriptor_rtx", 0));
+  scalar_tp = &scalar_nonchar;  /* rtunion int */
+
+  {
+    pair_p note_flds = NULL;
+    int c;
+
+    for (c = 0; c <= NOTE_INSN_MAX; c++)
+      {
+	switch (c)
+	  {
+	  case NOTE_INSN_MAX:
+	    note_flds = create_field (note_flds, &string_type, "rt_str");
+	    break;
+
+	  case NOTE_INSN_BLOCK_BEG:
+	  case NOTE_INSN_BLOCK_END:
+	    note_flds = create_field (note_flds, tree_tp, "rt_tree");
+	    break;
+
+	  case NOTE_INSN_VAR_LOCATION:
+	    note_flds = create_field (note_flds, rtx_tp, "rt_rtx");
+	    break;
+
+	  default:
+	    note_flds = create_field (note_flds, scalar_tp, "rt_int");
+	    break;
+	  }
+	/* NOTE_INSN_MAX is used as the default field for line
+	   number notes.  */
+	if (c == NOTE_INSN_MAX)
+	  note_flds->opt = create_option (nodot, "default", "");
+	else
+	  note_flds->opt = create_option (nodot, "tag", note_insn_name[c]);
+      }
+    note_union_tp = new_structure ("rtx_def_note_subunion", 1,
+				   &lexer_line, note_flds, NULL);
+  }
+  /* Create a type to represent the various forms of SYMBOL_REF_DATA.  */
+  {
+    pair_p sym_flds;
+
+    sym_flds = create_field (NULL, tree_tp, "rt_tree");
+    sym_flds->opt = create_option (nodot, "default", "");
+
+    sym_flds = create_field (sym_flds, constant_tp, "rt_constant");
+    sym_flds->opt = create_option (nodot, "tag", "1");
+
+    symbol_union_tp = new_structure ("rtx_def_symbol_subunion", 1,
+				     &lexer_line, sym_flds, NULL);
+  }
+  for (i = 0; i < NUM_RTX_CODE; i++)
+    {
+      pair_p subfields = NULL;
+      size_t aindex, nmindex;
+      const char *sname;
+      type_p substruct;
+      char *ftag;
+
+      for (aindex = 0; aindex < strlen (rtx_format[i]); aindex++)
+	{
+	  type_p t;
+	  const char *subname;
+
+	  switch (rtx_format[i][aindex])
+	    {
+	    case '*':
+	    case 'i':
+	    case 'n':
+	    case 'w':
+	      t = scalar_tp;
+	      subname = "rt_int";
+	      break;
+
+	    case '0':
+	      if (i == MEM && aindex == 1)
+		t = mem_attrs_tp, subname = "rt_mem";
+	      else if (i == JUMP_INSN && aindex == 8)
+		t = rtx_tp, subname = "rt_rtx";
+	      else if (i == CODE_LABEL && aindex == 4)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == CODE_LABEL && aindex == 5)
+		t = rtx_tp, subname = "rt_rtx";
+	      else if (i == LABEL_REF
+		       && (aindex == 1 || aindex == 2))
+		t = rtx_tp, subname = "rt_rtx";
+	      else if (i == NOTE && aindex == 4)
+		t = note_union_tp, subname = "";
+	      else if (i == NOTE && aindex == 5)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == NOTE && aindex >= 7)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == ADDR_DIFF_VEC && aindex == 4)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == VALUE && aindex == 0)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == REG && aindex == 1)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == REG && aindex == 2)
+		t = reg_attrs_tp, subname = "rt_reg";
+	      else if (i == SCRATCH && aindex == 0)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == SYMBOL_REF && aindex == 1)
+		t = scalar_tp, subname = "rt_int";
+	      else if (i == SYMBOL_REF && aindex == 2)
+		t = symbol_union_tp, subname = "";
+	      else if (i == BARRIER && aindex >= 3)
+		t = scalar_tp, subname = "rt_int";
+	      else
+		{
+		  error_at_line (&lexer_line,
+			"rtx type `%s' has `0' in position %lu, can't handle",
+				 rtx_name[i], (unsigned long) aindex);
+		  t = &string_type;
+		  subname = "rt_int";
+		}
+	      break;
+
+	    case 's':
+	    case 'S':
+	    case 'T':
+	      t = &string_type;
+	      subname = "rt_str";
+	      break;
+
+	    case 'e':
+	    case 'u':
+	      t = rtx_tp;
+	      subname = "rt_rtx";
+	      break;
+
+	    case 'E':
+	    case 'V':
+	      t = rtvec_tp;
+	      subname = "rt_rtvec";
+	      break;
+
+	    case 't':
+	      t = tree_tp;
+	      subname = "rt_tree";
+	      break;
+
+	    case 'b':
+	      t = bitmap_tp;
+	      subname = "rt_bit";
+	      break;
+
+	    case 'B':
+	      t = basic_block_tp;
+	      subname = "rt_bb";
+	      break;
+
+	    default:
+	      error_at_line (&lexer_line,
+		     "rtx type `%s' has `%c' in position %lu, can't handle",
+			     rtx_name[i], rtx_format[i][aindex],
+			     (unsigned long)aindex);
+	      t = &string_type;
+	      subname = "rt_int";
+	      break;
+	    }
+
+	  subfields = create_field (subfields, t,
+				    xasprintf (".fld[%lu].%s",
+					       (unsigned long) aindex,
+					       subname));
+	  subfields->opt = nodot;
+	  if (t == note_union_tp)
+	    subfields->opt = create_option (subfields->opt, "desc",
+					    "NOTE_KIND (&%0)");
+	  if (t == symbol_union_tp)
+	    subfields->opt = create_option (subfields->opt, "desc",
+					    "CONSTANT_POOL_ADDRESS_P (&%0)");
+	}
+
+      if (i == SYMBOL_REF)
+	{
+	  /* Add the "block_sym" field if SYMBOL_REF_HAS_BLOCK_INFO_P holds.  */
+	  type_p field_tp = find_structure ("block_symbol", 0);
+	  subfields
+	    = create_optional_field (subfields, field_tp, "block_sym",
+				     "SYMBOL_REF_HAS_BLOCK_INFO_P (&%0)");
+	}
+
+      sname = xasprintf ("rtx_def_%s", rtx_name[i]);
+      substruct = new_structure (sname, 0, &lexer_line, subfields, NULL);
+
+      ftag = xstrdup (rtx_name[i]);
+      for (nmindex = 0; nmindex < strlen (ftag); nmindex++)
+	ftag[nmindex] = TOUPPER (ftag[nmindex]);
+
+      flds = create_field (flds, substruct, "");
+      flds->opt = create_option (nodot, "tag", ftag);
+    }
+
+  return new_structure ("rtx_def_subunion", 1, &lexer_line, flds, nodot);
+}
+
+/* Handle `special("tree_exp")'.  This is a special case for
+   field `operands' of struct tree_exp, which although it claims to contain
+   pointers to trees, actually sometimes contains pointers to RTL too.
+   Passed T, the old type of the field, and OPT its options.  Returns
+   a new type for the field.  */
+
+static type_p
+adjust_field_tree_exp (type_p t, options_p opt ATTRIBUTE_UNUSED)
+{
+  pair_p flds;
+  options_p nodot;
+
+  if (t->kind != TYPE_ARRAY)
+    {
+      error_at_line (&lexer_line,
+		     "special `tree_exp' must be applied to an array");
+      return &string_type;
+    }
+
+  nodot = create_option (NULL, "dot", "");
+
+  flds = create_field (NULL, t, "");
+  flds->opt = create_option (nodot, "length",
+			     "TREE_OPERAND_LENGTH ((tree) &%0)");
+  flds->opt = create_option (flds->opt, "default", "");
+
+  return new_structure ("tree_exp_subunion", 1, &lexer_line, flds, nodot);
+}
+
+/* Perform any special processing on a type T, about to become the type
+   of a field.  Return the appropriate type for the field.
+   At present:
+   - Converts pointer-to-char, with no length parameter, to TYPE_STRING;
+   - Similarly for arrays of pointer-to-char;
+   - Converts structures for which a parameter is provided to
+     TYPE_PARAM_STRUCT;
+   - Handles "special" options.
+*/
+
+type_p
+adjust_field_type (type_p t, options_p opt)
+{
+  int length_p = 0;
+  const int pointer_p = t->kind == TYPE_POINTER;
+  type_p params[NUM_PARAM];
+  int params_p = 0;
+  int i;
+
+  for (i = 0; i < NUM_PARAM; i++)
+    params[i] = NULL;
+
+  for (; opt; opt = opt->next)
+    if (strcmp (opt->name, "length") == 0)
+      length_p = 1;
+    else if (strcmp (opt->name, "param_is") == 0
+	     || (strncmp (opt->name, "param", 5) == 0
+		 && ISDIGIT (opt->name[5])
+		 && strcmp (opt->name + 6, "_is") == 0))
+      {
+	int num = ISDIGIT (opt->name[5]) ? opt->name[5] - '0' : 0;
+
+	if (! UNION_OR_STRUCT_P (t)
+	    && (t->kind != TYPE_POINTER || ! UNION_OR_STRUCT_P (t->u.p)))
+	  {
+	    error_at_line (&lexer_line,
+   "option `%s' may only be applied to structures or structure pointers",
+			   opt->name);
+	    return t;
+	  }
+
+	params_p = 1;
+	if (params[num] != NULL)
+	  error_at_line (&lexer_line, "duplicate `%s' option", opt->name);
+	if (! ISDIGIT (opt->name[5]))
+	  params[num] = create_pointer (CONST_CAST2(type_p, const char *, opt->info));
+	else
+	  params[num] = CONST_CAST2 (type_p, const char *, opt->info);
+      }
+    else if (strcmp (opt->name, "special") == 0)
+      {
+	const char *special_name = opt->info;
+	if (strcmp (special_name, "tree_exp") == 0)
+	  t = adjust_field_tree_exp (t, opt);
+	else if (strcmp (special_name, "rtx_def") == 0)
+	  t = adjust_field_rtx_def (t, opt);
+	else
+	  error_at_line (&lexer_line, "unknown special `%s'", special_name);
+      }
+
+  if (params_p)
+    {
+      type_p realt;
+
+      if (pointer_p)
+	t = t->u.p;
+      realt = find_param_structure (t, params);
+      t = pointer_p ? create_pointer (realt) : realt;
+    }
+
+  if (! length_p
+      && pointer_p
+      && t->u.p->kind == TYPE_SCALAR
+      && t->u.p->u.scalar_is_char)
+    return &string_type;
+  if (t->kind == TYPE_ARRAY && t->u.a.p->kind == TYPE_POINTER
+      && t->u.a.p->u.p->kind == TYPE_SCALAR
+      && t->u.a.p->u.p->u.scalar_is_char)
+    return create_array (&string_type, t->u.a.len);
+
+  return t;
+}
+
+
+static void set_gc_used_type (type_p, enum gc_used_enum, type_p *);
+static void set_gc_used (pair_p);
+
+/* Handle OPT for set_gc_used_type.  */
+
+static void
+process_gc_options (options_p opt, enum gc_used_enum level, int *maybe_undef,
+		    int *pass_param, int *length, int *skip, type_p *nested_ptr)
+{
+  options_p o;
+  for (o = opt; o; o = o->next)
+    if (strcmp (o->name, "ptr_alias") == 0 && level == GC_POINTED_TO)
+      set_gc_used_type (CONST_CAST2 (type_p, const char *, o->info),
+			GC_POINTED_TO, NULL);
+    else if (strcmp (o->name, "maybe_undef") == 0)
+      *maybe_undef = 1;
+    else if (strcmp (o->name, "use_params") == 0)
+      *pass_param = 1;
+    else if (strcmp (o->name, "length") == 0)
+      *length = 1;
+    else if (strcmp (o->name, "skip") == 0)
+      *skip = 1;
+    else if (strcmp (o->name, "nested_ptr") == 0)
+      *nested_ptr = ((const struct nested_ptr_data *) o->info)->type;
+}
+
+/* Set the gc_used field of T to LEVEL, and handle the types it references.  */
+
+static void
+set_gc_used_type (type_p t, enum gc_used_enum level, type_p param[NUM_PARAM])
+{
+  if (t->gc_used >= level)
+    return;
+
+  t->gc_used = level;
+
+  switch (t->kind)
+    {
+    case TYPE_STRUCT:
+    case TYPE_UNION:
+      {
+	pair_p f;
+	int dummy;
+	type_p dummy2;
+
+	process_gc_options (t->u.s.opt, level, &dummy, &dummy, &dummy, &dummy,
+			    &dummy2);
+
+	for (f = t->u.s.fields; f; f = f->next)
+	  {
+	    int maybe_undef = 0;
+	    int pass_param = 0;
+	    int length = 0;
+	    int skip = 0;
+	    type_p nested_ptr = NULL;
+	    process_gc_options (f->opt, level, &maybe_undef, &pass_param,
+				&length, &skip, &nested_ptr);
+
+	    if (nested_ptr && f->type->kind == TYPE_POINTER)
+	      set_gc_used_type (nested_ptr, GC_POINTED_TO, 
+				pass_param ? param : NULL);
+	    else if (length && f->type->kind == TYPE_POINTER)
+	      set_gc_used_type (f->type->u.p, GC_USED, NULL);
+	    else if (maybe_undef && f->type->kind == TYPE_POINTER)
+	      set_gc_used_type (f->type->u.p, GC_MAYBE_POINTED_TO, NULL);
+	    else if (pass_param && f->type->kind == TYPE_POINTER && param)
+	      set_gc_used_type (find_param_structure (f->type->u.p, param),
+				GC_POINTED_TO, NULL);
+	    else if (skip)
+	      ; /* target type is not used through this field */
+	    else
+	      set_gc_used_type (f->type, GC_USED, pass_param ? param : NULL);
+	  }
+	break;
+      }
+
+    case TYPE_POINTER:
+      set_gc_used_type (t->u.p, GC_POINTED_TO, NULL);
+      break;
+
+    case TYPE_ARRAY:
+      set_gc_used_type (t->u.a.p, GC_USED, param);
+      break;
+
+    case TYPE_LANG_STRUCT:
+      for (t = t->u.s.lang_struct; t; t = t->next)
+	set_gc_used_type (t, level, param);
+      break;
+
+    case TYPE_PARAM_STRUCT:
+      {
+	int i;
+	for (i = 0; i < NUM_PARAM; i++)
+	  if (t->u.param_struct.param[i] != 0)
+	    set_gc_used_type (t->u.param_struct.param[i], GC_USED, NULL);
+      }
+      if (t->u.param_struct.stru->gc_used == GC_POINTED_TO)
+	level = GC_POINTED_TO;
+      else
+	level = GC_USED;
+      t->u.param_struct.stru->gc_used = GC_UNUSED;
+      set_gc_used_type (t->u.param_struct.stru, level,
+			t->u.param_struct.param);
+      break;
+
+    default:
+      break;
+    }
+}
+
+/* Set the gc_used fields of all the types pointed to by VARIABLES.  */
+
+static void
+set_gc_used (pair_p variables)
+{
+  pair_p p;
+  for (p = variables; p; p = p->next)
+    set_gc_used_type (p->type, GC_USED, NULL);
+}
+
+/* File mapping routines.  For each input file, there is one output .c file
+   (but some output files have many input files), and there is one .h file
+   for the whole build.  */
+
+/* Output file handling.  */
+
+/* Create and return an outf_p for a new file for NAME, to be called
+   ONAME.  */
+
+static outf_p
+create_file (const char *name, const char *oname)
+{
+  static const char *const hdr[] = {
+    "   Copyright (C) 2004, 2007 Free Software Foundation, Inc.\n",
+    "\n",
+    "This file is part of GCC.\n",
+    "\n",
+    "GCC is free software; you can redistribute it and/or modify it under\n",
+    "the terms of the GNU General Public License as published by the Free\n",
+    "Software Foundation; either version 3, or (at your option) any later\n",
+    "version.\n",
+    "\n",
+    "GCC is distributed in the hope that it will be useful, but WITHOUT ANY\n",
+    "WARRANTY; without even the implied warranty of MERCHANTABILITY or\n",
+    "FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License\n",
+    "for more details.\n",
+    "\n",
+    "You should have received a copy of the GNU General Public License\n",
+    "along with GCC; see the file COPYING3.  If not see\n",
+    "<http://www.gnu.org/licenses/>.  */\n",
+    "\n",
+    "/* This file is machine generated.  Do not edit.  */\n"
+  };
+  outf_p f;
+  size_t i;
+
+  f = XCNEW (struct outf);
+  f->next = output_files;
+  f->name = oname;
+  output_files = f;
+
+  oprintf (f, "/* Type information for %s.\n", name);
+  for (i = 0; i < ARRAY_SIZE (hdr); i++)
+    oprintf (f, "%s", hdr[i]);
+  return f;
+}
+
+/* Print, like fprintf, to O.  
+   N.B. You might think this could be implemented more efficiently
+   with vsnprintf().  Unfortunately, there are C libraries that
+   provide that function but without the C99 semantics for its return
+   value, making it impossible to know how much space is required.  */
+void
+oprintf (outf_p o, const char *format, ...)
+{
+  char *s;
+  size_t slength;
+  va_list ap;
+
+  va_start (ap, format);
+  slength = vasprintf (&s, format, ap);
+  if (s == NULL || (int)slength < 0)
+    fatal ("out of memory");
+  va_end (ap);
+
+  if (o->bufused + slength > o->buflength)
+    {
+      size_t new_len = o->buflength;
+      if (new_len == 0)
+	new_len = 1024;
+      do {
+	new_len *= 2;
+      } while (o->bufused + slength >= new_len);
+      o->buf = XRESIZEVEC (char, o->buf, new_len);
+      o->buflength = new_len;
+    }
+  memcpy (o->buf + o->bufused, s, slength);
+  o->bufused += slength;
+  free (s);
+}
+
+/* Open the global header file and the language-specific header files.  */
+
+static void
+open_base_files (void)
+{
+  size_t i;
+
+  header_file = create_file ("GCC", "gtype-desc.h");
+
+  base_files = XNEWVEC (outf_p, num_lang_dirs);
+
+  for (i = 0; i < num_lang_dirs; i++)
+    base_files[i] = create_file (lang_dir_names[i],
+				 xasprintf ("gtype-%s.h", lang_dir_names[i]));
+
+  /* gtype-desc.c is a little special, so we create it here.  */
+  {
+    /* The order of files here matters very much.  */
+    static const char *const ifiles [] = {
+      "config.h", "system.h", "coretypes.h", "tm.h", "varray.h", 
+      "hashtab.h", "splay-tree.h",  "obstack.h", "bitmap.h", "input.h",
+      "tree.h", "rtl.h", "function.h", "insn-config.h", "expr.h",
+      "hard-reg-set.h", "basic-block.h", "cselib.h", "insn-addr.h",
+      "optabs.h", "libfuncs.h", "debug.h", "ggc.h", "cgraph.h",
+      "tree-flow.h", "reload.h", "cpp-id-data.h", "tree-chrec.h",
+      "cfglayout.h", "except.h", "output.h", "gimple.h", "cfgloop.h", NULL
+    };
+    const char *const *ifp;
+    outf_p gtype_desc_c;
+
+    gtype_desc_c = create_file ("GCC", "gtype-desc.c");
+    for (ifp = ifiles; *ifp; ifp++)
+      oprintf (gtype_desc_c, "#include \"%s\"\n", *ifp);
+
+    /* Make sure we handle "cfun" specially.  */
+    oprintf (gtype_desc_c, "\n/* See definition in function.h.  */\n");
+    oprintf (gtype_desc_c, "#undef cfun\n");
+  }
+}
+
+/* For F a filename, return the real basename of F, with all the directory
+   components skipped.  */
+
+static const char *
+get_file_realbasename (const char *f)
+{
+  const char * lastslash = strrchr (f, '/');
+  
+  return (lastslash != NULL) ? lastslash + 1 : f;
+}
+
+/* For F a filename, return the relative path to F from $(srcdir) if the
+   latter is a prefix in F, NULL otherwise.  */
+
+static const char *
+get_file_srcdir_relative_path (const char *f)
+{
+  if (strlen (f) > srcdir_len
+      && IS_DIR_SEPARATOR (f[srcdir_len])
+      && memcmp (f, srcdir, srcdir_len) == 0)
+    return f + srcdir_len + 1;
+  else
+    return NULL;
+}
+
+/* For F a filename, return the relative path to F from $(srcdir) if the
+   latter is a prefix in F, or the real basename of F otherwise.  */
+
+static const char *
+get_file_basename (const char *f)
+{
+  const char * srcdir_path = get_file_srcdir_relative_path (f);
+
+  return (srcdir_path != NULL) ? srcdir_path : get_file_realbasename (f);
+}
+
+/* For F a filename, return the lang_dir_names relative index of the language
+   directory that is a prefix in F, if any, -1 otherwise.  */
+
+static int
+get_prefix_langdir_index (const char *f)
+{
+  size_t f_len = strlen (f);
+  size_t lang_index;
+
+  for (lang_index = 0; lang_index < num_lang_dirs; lang_index++)
+    {
+      const char * langdir = lang_dir_names [lang_index];
+      size_t langdir_len = strlen (langdir);
+	  
+      if (f_len > langdir_len
+	  && IS_DIR_SEPARATOR (f[langdir_len])
+	  && memcmp (f, langdir, langdir_len) == 0)
+	return lang_index;
+    }
+
+  return -1;
+}
+
+/* For F a filename, return the name of language directory where F is located,
+   if any, NULL otherwise.  */
+
+static const char *
+get_file_langdir (const char *f)
+{
+  /* Get the relative path to F from $(srcdir) and find the language by
+     comparing the prefix with language directory names.  If F is not even
+     srcdir relative, no point in looking further.  */
+
+  int lang_index;
+  const char * srcdir_relative_path = get_file_srcdir_relative_path (f);
+
+  if (!srcdir_relative_path)
+    return NULL;
+
+  lang_index = get_prefix_langdir_index (srcdir_relative_path);
+
+  return (lang_index >= 0) ? lang_dir_names [lang_index] : NULL;
+}
+
+/* The gt- output file name for F.  */
+
+static const char *
+get_file_gtfilename (const char *f)
+{
+  /* Cook up an initial version of the gt- file name from the file real
+     basename and the language name, if any.  */
+
+  const char *basename = get_file_realbasename (f);
+  const char *langdir = get_file_langdir (f);
+  
+  char * result =
+    (langdir ? xasprintf ("gt-%s-%s", langdir, basename)
+     : xasprintf ("gt-%s", basename));
+
+  /* Then replace all non alphanumerics characters by '-' and change the
+     extenstion to ".h".  We expect the input filename extension was at least
+     one character long.  */
+
+  char *s = result;
+
+  for (; *s != '.'; s++)
+    if (! ISALNUM (*s) && *s != '-')
+      *s = '-';
+
+  memcpy (s, ".h", sizeof (".h"));
+
+  return result;
+}
+
+/* An output file, suitable for definitions, that can see declarations
+   made in INPUT_FILE and is linked into every language that uses
+   INPUT_FILE.  */
+
+outf_p
+get_output_file_with_visibility (const char *input_file)
+{
+  outf_p r;
+  size_t len;
+  const char *basename;
+  const char *for_name;
+  const char *output_name;
+
+  /* This can happen when we need a file with visibility on a
+     structure that we've never seen.  We have to just hope that it's
+     globally visible.  */
+  if (input_file == NULL)
+    input_file = "system.h";
+
+  /* Determine the output file name.  */
+  basename = get_file_basename (input_file);
+
+  len = strlen (basename);
+  if ((len > 2 && memcmp (basename+len-2, ".c", 2) == 0)
+      || (len > 2 && memcmp (basename+len-2, ".y", 2) == 0)
+      || (len > 3 && memcmp (basename+len-3, ".in", 3) == 0))
+    {
+      output_name = get_file_gtfilename (input_file); 
+      for_name = basename;
+    }
+  /* Some headers get used by more than one front-end; hence, it
+     would be inappropriate to spew them out to a single gtype-<lang>.h
+     (and gengtype doesn't know how to direct spewage into multiple
+     gtype-<lang>.h headers at this time).  Instead, we pair up these
+     headers with source files (and their special purpose gt-*.h headers).  */
+  else if (strcmp (basename, "c-common.h") == 0)
+    output_name = "gt-c-common.h", for_name = "c-common.c";
+  else if (strcmp (basename, "c-tree.h") == 0)
+    output_name = "gt-c-decl.h", for_name = "c-decl.c";
+  else if (strncmp (basename, "cp", 2) == 0 && IS_DIR_SEPARATOR (basename[2])
+	   && strcmp (basename + 3, "cp-tree.h") == 0)
+    output_name = "gt-cp-tree.h", for_name = "cp/tree.c";
+  else if (strncmp (basename, "cp", 2) == 0 && IS_DIR_SEPARATOR (basename[2])
+	   && strcmp (basename + 3, "decl.h") == 0)
+    output_name = "gt-cp-decl.h", for_name = "cp/decl.c";
+  else if (strncmp (basename, "cp", 2) == 0 && IS_DIR_SEPARATOR (basename[2])
+	   && strcmp (basename + 3, "name-lookup.h") == 0)
+    output_name = "gt-cp-name-lookup.h", for_name = "cp/name-lookup.c";
+  else if (strncmp (basename, "objc", 4) == 0 && IS_DIR_SEPARATOR (basename[4])
+	   && strcmp (basename + 5, "objc-act.h") == 0)
+    output_name = "gt-objc-objc-act.h", for_name = "objc/objc-act.c";
+  else 
+    {
+      int lang_index = get_prefix_langdir_index (basename);
+
+      if (lang_index >= 0)
+	return base_files[lang_index];
+
+      output_name = "gtype-desc.c";
+      for_name = NULL;
+    }
+
+  /* Look through to see if we've ever seen this output filename before.  */
+  for (r = output_files; r; r = r->next)
+    if (strcmp (r->name, output_name) == 0)
+      return r;
+
+  /* If not, create it.  */
+  r = create_file (for_name, output_name);
+
+  return r;
+}
+
+/* The name of an output file, suitable for definitions, that can see
+   declarations made in INPUT_FILE and is linked into every language
+   that uses INPUT_FILE.  */
+
+const char *
+get_output_file_name (const char *input_file)
+{
+  return get_output_file_with_visibility (input_file)->name;
+}
+
+/* Copy the output to its final destination,
+   but don't unnecessarily change modification times.  */
+
+static void
+close_output_files (void)
+{
+  outf_p of;
+
+  for (of = output_files; of; of = of->next)
+    {
+      FILE * newfile;
+
+      newfile = fopen (of->name, "r");
+      if (newfile != NULL )
+	{
+	  int no_write_p;
+	  size_t i;
+
+	  for (i = 0; i < of->bufused; i++)
+	    {
+	      int ch;
+	      ch = fgetc (newfile);
+	      if (ch == EOF || ch != (unsigned char) of->buf[i])
+		break;
+	    }
+	  no_write_p = i == of->bufused && fgetc (newfile) == EOF;
+	  fclose (newfile);
+
+	  if (no_write_p)
+	    continue;
+	}
+
+      newfile = fopen (of->name, "w");
+      if (newfile == NULL)
+	fatal ("opening output file %s: %s", of->name, strerror (errno));
+      if (fwrite (of->buf, 1, of->bufused, newfile) != of->bufused)
+	fatal ("writing output file %s: %s", of->name, strerror (errno));
+      if (fclose (newfile) != 0)
+	fatal ("closing output file %s: %s", of->name, strerror (errno));
+    }
+}
+
+struct flist {
+  struct flist *next;
+  int started_p;
+  const char *name;
+  outf_p f;
+};
+
+struct walk_type_data;
+
+/* For scalars and strings, given the item in 'val'.
+   For structures, given a pointer to the item in 'val'.
+   For misc. pointers, given the item in 'val'.
+*/
+typedef void (*process_field_fn)
+     (type_p f, const struct walk_type_data *p);
+typedef void (*func_name_fn)
+     (type_p s, const struct walk_type_data *p);
+
+/* Parameters for write_types.  */
+
+struct write_types_data
+{
+  const char *prefix;
+  const char *param_prefix;
+  const char *subfield_marker_routine;
+  const char *marker_routine;
+  const char *reorder_note_routine;
+  const char *comment;
+  int skip_hooks;		/* skip hook generation if non zero */
+};
+
+static void output_escaped_param (struct walk_type_data *d,
+				  const char *, const char *);
+static void output_mangled_typename (outf_p, const_type_p);
+static void walk_type (type_p t, struct walk_type_data *d);
+static void write_func_for_structure
+     (type_p orig_s, type_p s, type_p * param,
+      const struct write_types_data *wtd);
+static void write_types_process_field
+     (type_p f, const struct walk_type_data *d);
+static void write_types (type_p structures,
+			 type_p param_structs,
+			 const struct write_types_data *wtd);
+static void write_types_local_process_field
+     (type_p f, const struct walk_type_data *d);
+static void write_local_func_for_structure
+     (type_p orig_s, type_p s, type_p * param);
+static void write_local (type_p structures,
+			 type_p param_structs);
+static void write_enum_defn (type_p structures, type_p param_structs);
+static int contains_scalar_p (type_p t);
+static void put_mangled_filename (outf_p , const char *);
+static void finish_root_table (struct flist *flp, const char *pfx,
+			       const char *tname, const char *lastname,
+			       const char *name);
+static void write_root (outf_p , pair_p, type_p, const char *, int,
+			struct fileloc *, const char *);
+static void write_array (outf_p f, pair_p v,
+			 const struct write_types_data *wtd);
+static void write_roots (pair_p);
+
+/* Parameters for walk_type.  */
+
+struct walk_type_data
+{
+  process_field_fn process_field;
+  const void *cookie;
+  outf_p of;
+  options_p opt;
+  const char *val;
+  const char *prev_val[4];
+  int indent;
+  int counter;
+  struct fileloc *line;
+  lang_bitmap bitmap;
+  type_p *param;
+  int used_length;
+  type_p orig_s;
+  const char *reorder_fn;
+  bool needs_cast_p;
+  bool fn_wants_lvalue;
+};
+
+/* Print a mangled name representing T to OF.  */
+
+static void
+output_mangled_typename (outf_p of, const_type_p t)
+{
+  if (t == NULL)
+    oprintf (of, "Z");
+  else switch (t->kind)
+    {
+    case TYPE_POINTER:
+      oprintf (of, "P");
+      output_mangled_typename (of, t->u.p);
+      break;
+    case TYPE_SCALAR:
+      oprintf (of, "I");
+      break;
+    case TYPE_STRING:
+      oprintf (of, "S");
+      break;
+    case TYPE_STRUCT:
+    case TYPE_UNION:
+    case TYPE_LANG_STRUCT:
+      oprintf (of, "%lu%s", (unsigned long) strlen (t->u.s.tag), t->u.s.tag);
+      break;
+    case TYPE_PARAM_STRUCT:
+      {
+	int i;
+	for (i = 0; i < NUM_PARAM; i++)
+	  if (t->u.param_struct.param[i] != NULL)
+	    output_mangled_typename (of, t->u.param_struct.param[i]);
+	output_mangled_typename (of, t->u.param_struct.stru);
+      }
+      break;
+    case TYPE_ARRAY:
+      gcc_unreachable ();
+    }
+}
+
+/* Print PARAM to D->OF processing escapes.  D->VAL references the
+   current object, D->PREV_VAL the object containing the current
+   object, ONAME is the name of the option and D->LINE is used to
+   print error messages.  */
+
+static void
+output_escaped_param (struct walk_type_data *d, const char *param,
+		      const char *oname)
+{
+  const char *p;
+
+  for (p = param; *p; p++)
+    if (*p != '%')
+      oprintf (d->of, "%c", *p);
+    else switch (*++p)
+      {
+      case 'h':
+	oprintf (d->of, "(%s)", d->prev_val[2]);
+	break;
+      case '0':
+	oprintf (d->of, "(%s)", d->prev_val[0]);
+	break;
+      case '1':
+	oprintf (d->of, "(%s)", d->prev_val[1]);
+	break;
+      case 'a':
+	{
+	  const char *pp = d->val + strlen (d->val);
+	  while (pp[-1] == ']')
+	    while (*pp != '[')
+	      pp--;
+	  oprintf (d->of, "%s", pp);
+	}
+	break;
+      default:
+	error_at_line (d->line, "`%s' option contains bad escape %c%c",
+		       oname, '%', *p);
+      }
+}
+
+/* Call D->PROCESS_FIELD for every field (or subfield) of D->VAL,
+   which is of type T.  Write code to D->OF to constrain execution (at
+   the point that D->PROCESS_FIELD is called) to the appropriate
+   cases.  Call D->PROCESS_FIELD on subobjects before calling it on
+   pointers to those objects.  D->PREV_VAL lists the objects
+   containing the current object, D->OPT is a list of options to
+   apply, D->INDENT is the current indentation level, D->LINE is used
+   to print error messages, D->BITMAP indicates which languages to
+   print the structure for, and D->PARAM is the current parameter
+   (from an enclosing param_is option).  */
+
+static void
+walk_type (type_p t, struct walk_type_data *d)
+{
+  const char *length = NULL;
+  const char *desc = NULL;
+  int maybe_undef_p = 0;
+  int use_param_num = -1;
+  int use_params_p = 0;
+  options_p oo;
+  const struct nested_ptr_data *nested_ptr_d = NULL;
+
+  d->needs_cast_p = false;
+  for (oo = d->opt; oo; oo = oo->next)
+    if (strcmp (oo->name, "length") == 0)
+      length = oo->info;
+    else if (strcmp (oo->name, "maybe_undef") == 0)
+      maybe_undef_p = 1;
+    else if (strncmp (oo->name, "use_param", 9) == 0
+	     && (oo->name[9] == '\0' || ISDIGIT (oo->name[9])))
+      use_param_num = oo->name[9] == '\0' ? 0 : oo->name[9] - '0';
+    else if (strcmp (oo->name, "use_params") == 0)
+      use_params_p = 1;
+    else if (strcmp (oo->name, "desc") == 0)
+      desc = oo->info;
+    else if (strcmp (oo->name, "mark_hook") == 0)
+      ;
+    else if (strcmp (oo->name, "nested_ptr") == 0)
+      nested_ptr_d = (const struct nested_ptr_data *) oo->info;
+    else if (strcmp (oo->name, "dot") == 0)
+      ;
+    else if (strcmp (oo->name, "tag") == 0)
+      ;
+    else if (strcmp (oo->name, "special") == 0)
+      ;
+    else if (strcmp (oo->name, "skip") == 0)
+      ;
+    else if (strcmp (oo->name, "default") == 0)
+      ;
+    else if (strcmp (oo->name, "descbits") == 0)
+      ;
+    else if (strcmp (oo->name, "param_is") == 0)
+      ;
+    else if (strncmp (oo->name, "param", 5) == 0
+	     && ISDIGIT (oo->name[5])
+	     && strcmp (oo->name + 6, "_is") == 0)
+      ;
+    else if (strcmp (oo->name, "chain_next") == 0)
+      ;
+    else if (strcmp (oo->name, "chain_prev") == 0)
+      ;
+    else if (strcmp (oo->name, "chain_circular") == 0)
+      ;
+    else if (strcmp (oo->name, "reorder") == 0)
+      ;
+    else
+      error_at_line (d->line, "unknown option `%s'\n", oo->name);
+
+  if (d->used_length)
+    length = NULL;
+
+  if (use_params_p)
+    {
+      int pointer_p = t->kind == TYPE_POINTER;
+
+      if (pointer_p)
+	t = t->u.p;
+      if (! UNION_OR_STRUCT_P (t))
+	error_at_line (d->line, "`use_params' option on unimplemented type");
+      else
+	t = find_param_structure (t, d->param);
+      if (pointer_p)
+	t = create_pointer (t);
+    }
+
+  if (use_param_num != -1)
+    {
+      if (d->param != NULL && d->param[use_param_num] != NULL)
+	{
+	  type_p nt = d->param[use_param_num];
+
+	  if (t->kind == TYPE_ARRAY)
+	    nt = create_array (nt, t->u.a.len);
+	  else if (length != NULL && t->kind == TYPE_POINTER)
+	    nt = create_pointer (nt);
+	  d->needs_cast_p = (t->kind != TYPE_POINTER
+			     && (nt->kind == TYPE_POINTER
+				 || nt->kind == TYPE_STRING));
+	  t = nt;
+	}
+      else
+	error_at_line (d->line, "no parameter defined for `%s'",
+		       d->val);
+    }
+
+  if (maybe_undef_p
+      && (t->kind != TYPE_POINTER || ! UNION_OR_STRUCT_P (t->u.p)))
+    {
+      error_at_line (d->line,
+		     "field `%s' has invalid option `maybe_undef_p'\n",
+		     d->val);
+      return;
+    }
+
+  switch (t->kind)
+    {
+    case TYPE_SCALAR:
+    case TYPE_STRING:
+      d->process_field (t, d);
+      break;
+
+    case TYPE_POINTER:
+      {
+	if (maybe_undef_p
+	    && t->u.p->u.s.line.file == NULL)
+	  {
+	    oprintf (d->of, "%*sgcc_assert (!%s);\n", d->indent, "", d->val);
+	    break;
+	  }
+
+	if (! length)
+	  {
+	    if (! UNION_OR_STRUCT_P (t->u.p)
+		&& t->u.p->kind != TYPE_PARAM_STRUCT)
+	      {
+		error_at_line (d->line,
+			       "field `%s' is pointer to unimplemented type",
+			       d->val);
+		break;
+	      }
+
+	    if (nested_ptr_d)
+	      {
+		const char *oldprevval2 = d->prev_val[2];
+
+		if (! UNION_OR_STRUCT_P (nested_ptr_d->type))
+		  {
+		    error_at_line (d->line,
+				   "field `%s' has invalid "
+				   "option `nested_ptr'\n",
+				   d->val);
+		    return;
+		  }
+
+		d->prev_val[2] = d->val;
+		oprintf (d->of, "%*s{\n", d->indent, "");
+		d->indent += 2;
+		d->val = xasprintf ("x%d", d->counter++);
+		oprintf (d->of, "%*s%s %s * %s%s =\n", d->indent, "",
+			 (nested_ptr_d->type->kind == TYPE_UNION 
+			  ? "union" : "struct"), 
+			 nested_ptr_d->type->u.s.tag, 
+			 d->fn_wants_lvalue ? "" : "const ",
+			 d->val);
+		oprintf (d->of, "%*s", d->indent + 2, "");
+		output_escaped_param (d, nested_ptr_d->convert_from,
+				      "nested_ptr");
+		oprintf (d->of, ";\n");
+
+		d->process_field (nested_ptr_d->type, d);
+
+		if (d->fn_wants_lvalue)
+		  {
+		    oprintf (d->of, "%*s%s = ", d->indent, "",
+			     d->prev_val[2]);
+		    d->prev_val[2] = d->val;
+		    output_escaped_param (d, nested_ptr_d->convert_to,
+					  "nested_ptr");
+		    oprintf (d->of, ";\n");
+		  }
+
+		d->indent -= 2;
+		oprintf (d->of, "%*s}\n", d->indent, "");
+		d->val = d->prev_val[2];
+		d->prev_val[2] = oldprevval2;
+	      }
+	    else
+	      d->process_field (t->u.p, d);
+	  }
+	else
+	  {
+	    int loopcounter = d->counter++;
+	    const char *oldval = d->val;
+	    const char *oldprevval3 = d->prev_val[3];
+	    char *newval;
+
+	    oprintf (d->of, "%*sif (%s != NULL) {\n", d->indent, "", d->val);
+	    d->indent += 2;
+	    oprintf (d->of, "%*ssize_t i%d;\n", d->indent, "", loopcounter);
+	    oprintf (d->of, "%*sfor (i%d = 0; i%d != (size_t)(", d->indent, "",
+		     loopcounter, loopcounter);
+	    output_escaped_param (d, length, "length");
+	    oprintf (d->of, "); i%d++) {\n", loopcounter);
+	    d->indent += 2;
+	    d->val = newval = xasprintf ("%s[i%d]", oldval, loopcounter);
+	    d->used_length = 1;
+	    d->prev_val[3] = oldval;
+	    walk_type (t->u.p, d);
+	    free (newval);
+	    d->val = oldval;
+	    d->prev_val[3] = oldprevval3;
+	    d->used_length = 0;
+	    d->indent -= 2;
+	    oprintf (d->of, "%*s}\n", d->indent, "");
+	    d->process_field(t, d);
+	    d->indent -= 2;
+	    oprintf (d->of, "%*s}\n", d->indent, "");
+	  }
+      }
+      break;
+
+    case TYPE_ARRAY:
+      {
+	int loopcounter = d->counter++;
+	const char *oldval = d->val;
+	char *newval;
+
+	/* If it's an array of scalars, we optimize by not generating
+	   any code.  */
+	if (t->u.a.p->kind == TYPE_SCALAR)
+	  break;
+
+	/* When walking an array, compute the length and store it in a
+	   local variable before walking the array elements, instead of
+	   recomputing the length expression each time through the loop.
+	   This is necessary to handle tcc_vl_exp objects like CALL_EXPR,
+	   where the length is stored in the first array element,
+	   because otherwise that operand can get overwritten on the
+	   first iteration.  */
+	oprintf (d->of, "%*s{\n", d->indent, "");
+	d->indent += 2;
+	oprintf (d->of, "%*ssize_t i%d;\n", d->indent, "", loopcounter);
+	oprintf (d->of, "%*ssize_t l%d = (size_t)(",
+		 d->indent, "", loopcounter);
+	if (length)
+	  output_escaped_param (d, length, "length");
+	else
+	  oprintf (d->of, "%s", t->u.a.len);
+	oprintf (d->of, ");\n");
+	
+	oprintf (d->of, "%*sfor (i%d = 0; i%d != l%d; i%d++) {\n",
+		 d->indent, "",
+		 loopcounter, loopcounter, loopcounter, loopcounter);
+	d->indent += 2;
+	d->val = newval = xasprintf ("%s[i%d]", oldval, loopcounter);
+	d->used_length = 1;
+	walk_type (t->u.a.p, d);
+	free (newval);
+	d->used_length = 0;
+	d->val = oldval;
+	d->indent -= 2;
+	oprintf (d->of, "%*s}\n", d->indent, "");
+	d->indent -= 2;
+	oprintf (d->of, "%*s}\n", d->indent, "");
+      }
+      break;
+
+    case TYPE_STRUCT:
+    case TYPE_UNION:
+      {
+	pair_p f;
+	const char *oldval = d->val;
+	const char *oldprevval1 = d->prev_val[1];
+	const char *oldprevval2 = d->prev_val[2];
+	const int union_p = t->kind == TYPE_UNION;
+	int seen_default_p = 0;
+	options_p o;
+
+	if (! t->u.s.line.file)
+	  error_at_line (d->line, "incomplete structure `%s'", t->u.s.tag);
+
+	if ((d->bitmap & t->u.s.bitmap) != d->bitmap)
+	  {
+	    error_at_line (d->line,
+			   "structure `%s' defined for mismatching languages",
+			   t->u.s.tag);
+	    error_at_line (&t->u.s.line, "one structure defined here");
+	  }
+
+	/* Some things may also be defined in the structure's options.  */
+	for (o = t->u.s.opt; o; o = o->next)
+	  if (! desc && strcmp (o->name, "desc") == 0)
+	    desc = o->info;
+
+	d->prev_val[2] = oldval;
+	d->prev_val[1] = oldprevval2;
+	if (union_p)
+	  {
+	    if (desc == NULL)
+	      {
+		error_at_line (d->line, "missing `desc' option for union `%s'",
+			       t->u.s.tag);
+		desc = "1";
+	      }
+	    oprintf (d->of, "%*sswitch (", d->indent, "");
+	    output_escaped_param (d, desc, "desc");
+	    oprintf (d->of, ")\n");
+	    d->indent += 2;
+	    oprintf (d->of, "%*s{\n", d->indent, "");
+	  }
+	for (f = t->u.s.fields; f; f = f->next)
+	  {
+	    options_p oo;
+	    const char *dot = ".";
+	    const char *tagid = NULL;
+	    int skip_p = 0;
+	    int default_p = 0;
+	    int use_param_p = 0;
+	    char *newval;
+
+	    d->reorder_fn = NULL;
+	    for (oo = f->opt; oo; oo = oo->next)
+	      if (strcmp (oo->name, "dot") == 0)
+		dot = oo->info;
+	      else if (strcmp (oo->name, "tag") == 0)
+		tagid = oo->info;
+	      else if (strcmp (oo->name, "skip") == 0)
+		skip_p = 1;
+	      else if (strcmp (oo->name, "default") == 0)
+		default_p = 1;
+	      else if (strcmp (oo->name, "reorder") == 0)
+		d->reorder_fn = oo->info;
+	      else if (strncmp (oo->name, "use_param", 9) == 0
+		       && (oo->name[9] == '\0' || ISDIGIT (oo->name[9])))
+		use_param_p = 1;
+
+	    if (skip_p)
+	      continue;
+
+	    if (union_p && tagid)
+	      {
+		oprintf (d->of, "%*scase %s:\n", d->indent, "", tagid);
+		d->indent += 2;
+	      }
+	    else if (union_p && default_p)
+	      {
+		oprintf (d->of, "%*sdefault:\n", d->indent, "");
+		d->indent += 2;
+		seen_default_p = 1;
+	      }
+	    else if (! union_p && (default_p || tagid))
+	      error_at_line (d->line,
+			     "can't use `%s' outside a union on field `%s'",
+			     default_p ? "default" : "tag", f->name);
+	    else if (union_p && ! (default_p || tagid)
+		     && f->type->kind == TYPE_SCALAR)
+	      {
+		fprintf (stderr,
+	"%s:%d: warning: field `%s' is missing `tag' or `default' option\n",
+			 d->line->file, d->line->line, f->name);
+		continue;
+	      }
+	    else if (union_p && ! (default_p || tagid))
+	      error_at_line (d->line,
+			     "field `%s' is missing `tag' or `default' option",
+			     f->name);
+
+	    d->line = &f->line;
+	    d->val = newval = xasprintf ("%s%s%s", oldval, dot, f->name);
+	    d->opt = f->opt;
+	    d->used_length = false;
+
+	    if (union_p && use_param_p && d->param == NULL)
+	      oprintf (d->of, "%*sgcc_unreachable ();\n", d->indent, "");
+	    else
+	      walk_type (f->type, d);
+
+	    free (newval);
+
+	    if (union_p)
+	      {
+		oprintf (d->of, "%*sbreak;\n", d->indent, "");
+		d->indent -= 2;
+	      }
+	  }
+	d->reorder_fn = NULL;
+
+	d->val = oldval;
+	d->prev_val[1] = oldprevval1;
+	d->prev_val[2] = oldprevval2;
+
+	if (union_p && ! seen_default_p)
+	  {
+	    oprintf (d->of, "%*sdefault:\n", d->indent, "");
+	    oprintf (d->of, "%*s  break;\n", d->indent, "");
+	  }
+	if (union_p)
+	  {
+	    oprintf (d->of, "%*s}\n", d->indent, "");
+	    d->indent -= 2;
+	  }
+      }
+      break;
+
+    case TYPE_LANG_STRUCT:
+      {
+	type_p nt;
+	for (nt = t->u.s.lang_struct; nt; nt = nt->next)
+	  if ((d->bitmap & nt->u.s.bitmap) == d->bitmap)
+	    break;
+	if (nt == NULL)
+	  error_at_line (d->line, "structure `%s' differs between languages",
+			 t->u.s.tag);
+	else
+	  walk_type (nt, d);
+      }
+      break;
+
+    case TYPE_PARAM_STRUCT:
+      {
+	type_p *oldparam = d->param;
+
+	d->param = t->u.param_struct.param;
+	walk_type (t->u.param_struct.stru, d);
+	d->param = oldparam;
+      }
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+}
+
+/* process_field routine for marking routines.  */
+
+static void
+write_types_process_field (type_p f, const struct walk_type_data *d)
+{
+  const struct write_types_data *wtd;
+  const char *cast = d->needs_cast_p ? "(void *)" : "";
+  wtd = (const struct write_types_data *) d->cookie;
+
+  switch (f->kind)
+    {
+    case TYPE_POINTER:
+      oprintf (d->of, "%*s%s (%s%s", d->indent, "",
+	       wtd->subfield_marker_routine, cast, d->val);
+      if (wtd->param_prefix)
+	{
+	  oprintf (d->of, ", %s", d->prev_val[3]);
+	  if (d->orig_s)
+	    {
+	      oprintf (d->of, ", gt_%s_", wtd->param_prefix);
+	      output_mangled_typename (d->of, d->orig_s);
+	    }
+	  else
+	    oprintf (d->of, ", gt_%sa_%s", wtd->param_prefix, d->prev_val[0]);
+
+	  if (f->u.p->kind == TYPE_PARAM_STRUCT
+	      && f->u.p->u.s.line.file != NULL)
+	    {
+	      oprintf (d->of, ", gt_e_");
+	      output_mangled_typename (d->of, f);
+	    }
+	  else if (UNION_OR_STRUCT_P (f)
+		   && f->u.p->u.s.line.file != NULL)
+	    {
+	      oprintf (d->of, ", gt_ggc_e_");
+	      output_mangled_typename (d->of, f);
+	    }
+	  else
+	    oprintf (d->of, ", gt_types_enum_last");
+	}
+      oprintf (d->of, ");\n");
+      if (d->reorder_fn && wtd->reorder_note_routine)
+	oprintf (d->of, "%*s%s (%s%s, %s, %s);\n", d->indent, "",
+		 wtd->reorder_note_routine, cast, d->val,
+		 d->prev_val[3], d->reorder_fn);
+      break;
+
+    case TYPE_STRING:
+    case TYPE_STRUCT:
+    case TYPE_UNION:
+    case TYPE_LANG_STRUCT:
+    case TYPE_PARAM_STRUCT:
+      oprintf (d->of, "%*sgt_%s_", d->indent, "", wtd->prefix);
+      output_mangled_typename (d->of, f);
+      oprintf (d->of, " (%s%s);\n", cast, d->val);
+      if (d->reorder_fn && wtd->reorder_note_routine)
+	oprintf (d->of, "%*s%s (%s%s, %s%s, %s);\n", d->indent, "",
+		 wtd->reorder_note_routine, cast, d->val, cast, d->val,
+		 d->reorder_fn);
+      break;
+
+    case TYPE_SCALAR:
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+}
+
+/* A subroutine of write_func_for_structure.  Write the enum tag for S.  */
+
+static void
+output_type_enum (outf_p of, type_p s)
+{
+  if (s->kind == TYPE_PARAM_STRUCT && s->u.s.line.file != NULL)
+    {
+      oprintf (of, ", gt_e_");
+      output_mangled_typename (of, s);
+    }
+  else if (UNION_OR_STRUCT_P (s) && s->u.s.line.file != NULL)
+    {
+      oprintf (of, ", gt_ggc_e_");
+      output_mangled_typename (of, s);
+    }
+  else
+    oprintf (of, ", gt_types_enum_last");
+}
+
+/* For S, a structure that's part of ORIG_S, and using parameters
+   PARAM, write out a routine that:
+   - Takes a parameter, a void * but actually of type *S
+   - If SEEN_ROUTINE returns nonzero, calls write_types_process_field on each
+     field of S or its substructures and (in some cases) things
+     that are pointed to by S.
+*/
+
+static void
+write_func_for_structure (type_p orig_s, type_p s, type_p *param,
+			  const struct write_types_data *wtd)
+{
+  const char *fn = s->u.s.line.file;
+  int i;
+  const char *chain_next = NULL;
+  const char *chain_prev = NULL;
+  const char *chain_circular = NULL;
+  const char *mark_hook_name = NULL;
+  options_p opt;
+  struct walk_type_data d;
+
+  /* This is a hack, and not the good kind either.  */
+  for (i = NUM_PARAM - 1; i >= 0; i--)
+    if (param && param[i] && param[i]->kind == TYPE_POINTER
+	&& UNION_OR_STRUCT_P (param[i]->u.p))
+      fn = param[i]->u.p->u.s.line.file;
+
+  memset (&d, 0, sizeof (d));
+  d.of = get_output_file_with_visibility (fn);
+
+  for (opt = s->u.s.opt; opt; opt = opt->next)
+    if (strcmp (opt->name, "chain_next") == 0)
+      chain_next = opt->info;
+    else if (strcmp (opt->name, "chain_prev") == 0)
+      chain_prev = opt->info;
+    else if (strcmp (opt->name, "chain_circular") == 0)
+      chain_circular = opt->info;
+    else if (strcmp (opt->name, "mark_hook") == 0)
+      mark_hook_name = opt->info;
+
+  if (chain_prev != NULL && chain_next == NULL)
+    error_at_line (&s->u.s.line, "chain_prev without chain_next");
+  if (chain_circular != NULL && chain_next != NULL)
+    error_at_line (&s->u.s.line, "chain_circular with chain_next");
+  if (chain_circular != NULL)
+    chain_next = chain_circular;
+
+  d.process_field = write_types_process_field;
+  d.cookie = wtd;
+  d.orig_s = orig_s;
+  d.opt = s->u.s.opt;
+  d.line = &s->u.s.line;
+  d.bitmap = s->u.s.bitmap;
+  d.param = param;
+  d.prev_val[0] = "*x";
+  d.prev_val[1] = "not valid postage";  /* Guarantee an error.  */
+  d.prev_val[3] = "x";
+  d.val = "(*x)";
+
+  oprintf (d.of, "\n");
+  oprintf (d.of, "void\n");
+  if (param == NULL)
+    oprintf (d.of, "gt_%sx_%s", wtd->prefix, orig_s->u.s.tag);
+  else
+    {
+      oprintf (d.of, "gt_%s_", wtd->prefix);
+      output_mangled_typename (d.of, orig_s);
+    }
+  oprintf (d.of, " (void *x_p)\n");
+  oprintf (d.of, "{\n");
+  oprintf (d.of, "  %s %s * %sx = (%s %s *)x_p;\n",
+	   s->kind == TYPE_UNION ? "union" : "struct", s->u.s.tag,
+	   chain_next == NULL ? "const " : "",
+	   s->kind == TYPE_UNION ? "union" : "struct", s->u.s.tag);
+  if (chain_next != NULL)
+    oprintf (d.of, "  %s %s * xlimit = x;\n",
+	     s->kind == TYPE_UNION ? "union" : "struct", s->u.s.tag);
+  if (chain_next == NULL)
+    {
+      oprintf (d.of, "  if (%s (x", wtd->marker_routine);
+      if (wtd->param_prefix)
+	{
+	  oprintf (d.of, ", x, gt_%s_", wtd->param_prefix);
+	  output_mangled_typename (d.of, orig_s);
+	  output_type_enum (d.of, orig_s);
+	}
+      oprintf (d.of, "))\n");
+    }
+  else
+    {
+      if (chain_circular != NULL)
+	oprintf (d.of, "  if (!%s (xlimit", wtd->marker_routine);
+      else
+	oprintf (d.of, "  while (%s (xlimit", wtd->marker_routine);
+      if (wtd->param_prefix)
+	{
+	  oprintf (d.of, ", xlimit, gt_%s_", wtd->param_prefix);
+	  output_mangled_typename (d.of, orig_s);
+	  output_type_enum (d.of, orig_s);
+	}
+      oprintf (d.of, "))\n");
+      if (chain_circular != NULL)
+	oprintf (d.of, "    return;\n  do\n");
+      if (mark_hook_name && !wtd->skip_hooks)
+	{
+	  oprintf (d.of, "    {\n");
+	  oprintf (d.of, "      %s (xlimit);\n   ", mark_hook_name);
+	}
+      oprintf (d.of, "   xlimit = (");
+      d.prev_val[2] = "*xlimit";
+      output_escaped_param (&d, chain_next, "chain_next");
+      oprintf (d.of, ");\n");
+      if (mark_hook_name && !wtd->skip_hooks)
+	oprintf (d.of, "    }\n");
+      if (chain_prev != NULL)
+	{
+	  oprintf (d.of, "  if (x != xlimit)\n");
+	  oprintf (d.of, "    for (;;)\n");
+	  oprintf (d.of, "      {\n");
+	  oprintf (d.of, "        %s %s * const xprev = (",
+		   s->kind == TYPE_UNION ? "union" : "struct", s->u.s.tag);
+
+	  d.prev_val[2] = "*x";
+	  output_escaped_param (&d, chain_prev, "chain_prev");
+	  oprintf (d.of, ");\n");
+	  oprintf (d.of, "        if (xprev == NULL) break;\n");
+	  oprintf (d.of, "        x = xprev;\n");
+	  oprintf (d.of, "        (void) %s (xprev",
+		   wtd->marker_routine);
+	  if (wtd->param_prefix)
+	    {
+	      oprintf (d.of, ", xprev, gt_%s_", wtd->param_prefix);
+	      output_mangled_typename (d.of, orig_s);
+	      output_type_enum (d.of, orig_s);
+	    }
+	  oprintf (d.of, ");\n");
+	  oprintf (d.of, "      }\n");
+	}
+      if (chain_circular != NULL)
+	{
+	  oprintf (d.of, "  while (%s (xlimit", wtd->marker_routine);
+	  if (wtd->param_prefix)
+	    {
+	      oprintf (d.of, ", xlimit, gt_%s_", wtd->param_prefix);
+	      output_mangled_typename (d.of, orig_s);
+	      output_type_enum (d.of, orig_s);
+	    }
+	  oprintf (d.of, "));\n");
+	  if (mark_hook_name && !wtd->skip_hooks)
+	    oprintf (d.of, "  %s (xlimit);\n", mark_hook_name);
+	  oprintf (d.of, "  do\n");
+	}
+      else
+	oprintf (d.of, "  while (x != xlimit)\n");
+    }
+  oprintf (d.of, "    {\n");
+  if (mark_hook_name && chain_next == NULL && !wtd->skip_hooks)
+    {
+      oprintf (d.of, "      %s (x);\n", mark_hook_name);
+    }
+  d.prev_val[2] = "*x";
+  d.indent = 6;
+  walk_type (s, &d);
+
+  if (chain_next != NULL)
+    {
+      oprintf (d.of, "      x = (");
+      output_escaped_param (&d, chain_next, "chain_next");
+      oprintf (d.of, ");\n");
+    }
+
+  oprintf (d.of, "    }\n");
+  if (chain_circular != NULL)
+    oprintf (d.of, "  while (x != xlimit);\n");
+  oprintf (d.of, "}\n");
+}
+
+/* Write out marker routines for STRUCTURES and PARAM_STRUCTS.  */
+
+static void
+write_types (type_p structures, type_p param_structs,
+	     const struct write_types_data *wtd)
+{
+  type_p s;
+
+  oprintf (header_file, "\n/* %s*/\n", wtd->comment);
+  for (s = structures; s; s = s->next)
+    if (s->gc_used == GC_POINTED_TO
+	|| s->gc_used == GC_MAYBE_POINTED_TO)
+      {
+	options_p opt;
+
+	if (s->gc_used == GC_MAYBE_POINTED_TO
+	    && s->u.s.line.file == NULL)
+	  continue;
+
+	oprintf (header_file, "#define gt_%s_", wtd->prefix);
+	output_mangled_typename (header_file, s);
+	oprintf (header_file, "(X) do { \\\n");
+	oprintf (header_file,
+		 "  if (X != NULL) gt_%sx_%s (X);\\\n", wtd->prefix,
+		 s->u.s.tag);
+	oprintf (header_file,
+		 "  } while (0)\n");
+
+	for (opt = s->u.s.opt; opt; opt = opt->next)
+	  if (strcmp (opt->name, "ptr_alias") == 0)
+	    {
+	      const_type_p const t = (const_type_p) opt->info;
+	      if (t->kind == TYPE_STRUCT
+		  || t->kind == TYPE_UNION
+		  || t->kind == TYPE_LANG_STRUCT)
+		oprintf (header_file,
+			 "#define gt_%sx_%s gt_%sx_%s\n",
+			 wtd->prefix, s->u.s.tag, wtd->prefix, t->u.s.tag);
+	      else
+		error_at_line (&s->u.s.line,
+			       "structure alias is not a structure");
+	      break;
+	    }
+	if (opt)
+	  continue;
+
+	/* Declare the marker procedure only once.  */
+	oprintf (header_file,
+		 "extern void gt_%sx_%s (void *);\n",
+		 wtd->prefix, s->u.s.tag);
+
+	if (s->u.s.line.file == NULL)
+	  {
+	    fprintf (stderr, "warning: structure `%s' used but not defined\n",
+		     s->u.s.tag);
+	    continue;
+	  }
+
+	if (s->kind == TYPE_LANG_STRUCT)
+	  {
+	    type_p ss;
+	    for (ss = s->u.s.lang_struct; ss; ss = ss->next)
+	      write_func_for_structure (s, ss, NULL, wtd);
+	  }
+	else
+	  write_func_for_structure (s, s, NULL, wtd);
+      }
+
+  for (s = param_structs; s; s = s->next)
+    if (s->gc_used == GC_POINTED_TO)
+      {
+	type_p * param = s->u.param_struct.param;
+	type_p stru = s->u.param_struct.stru;
+
+	/* Declare the marker procedure.  */
+	oprintf (header_file, "extern void gt_%s_", wtd->prefix);
+	output_mangled_typename (header_file, s);
+	oprintf (header_file, " (void *);\n");
+
+	if (stru->u.s.line.file == NULL)
+	  {
+	    fprintf (stderr, "warning: structure `%s' used but not defined\n",
+		     s->u.s.tag);
+	    continue;
+	  }
+
+	if (stru->kind == TYPE_LANG_STRUCT)
+	  {
+	    type_p ss;
+	    for (ss = stru->u.s.lang_struct; ss; ss = ss->next)
+	      write_func_for_structure (s, ss, param, wtd);
+	  }
+	else
+	  write_func_for_structure (s, stru, param, wtd);
+      }
+}
+
+static const struct write_types_data ggc_wtd =
+{
+  "ggc_m", NULL, "ggc_mark", "ggc_test_and_set_mark", NULL,
+  "GC marker procedures.  ",
+  FALSE
+};
+
+static const struct write_types_data pch_wtd =
+{
+  "pch_n", "pch_p", "gt_pch_note_object", "gt_pch_note_object",
+  "gt_pch_note_reorder",
+  "PCH type-walking procedures.  ",
+  TRUE
+};
+
+/* Write out the local pointer-walking routines.  */
+
+/* process_field routine for local pointer-walking.  */
+
+static void
+write_types_local_process_field (type_p f, const struct walk_type_data *d)
+{
+  switch (f->kind)
+    {
+    case TYPE_POINTER:
+    case TYPE_STRUCT:
+    case TYPE_UNION:
+    case TYPE_LANG_STRUCT:
+    case TYPE_PARAM_STRUCT:
+    case TYPE_STRING:
+      oprintf (d->of, "%*sif ((void *)(%s) == this_obj)\n", d->indent, "",
+	       d->prev_val[3]);
+      oprintf (d->of, "%*s  op (&(%s), cookie);\n", d->indent, "", d->val);
+      break;
+
+    case TYPE_SCALAR:
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+}
+
+/* For S, a structure that's part of ORIG_S, and using parameters
+   PARAM, write out a routine that:
+   - Is of type gt_note_pointers
+   - Calls PROCESS_FIELD on each field of S or its substructures.
+*/
+
+static void
+write_local_func_for_structure (type_p orig_s, type_p s, type_p *param)
+{
+  const char *fn = s->u.s.line.file;
+  int i;
+  struct walk_type_data d;
+
+  /* This is a hack, and not the good kind either.  */
+  for (i = NUM_PARAM - 1; i >= 0; i--)
+    if (param && param[i] && param[i]->kind == TYPE_POINTER
+	&& UNION_OR_STRUCT_P (param[i]->u.p))
+      fn = param[i]->u.p->u.s.line.file;
+
+  memset (&d, 0, sizeof (d));
+  d.of = get_output_file_with_visibility (fn);
+
+  d.process_field = write_types_local_process_field;
+  d.opt = s->u.s.opt;
+  d.line = &s->u.s.line;
+  d.bitmap = s->u.s.bitmap;
+  d.param = param;
+  d.prev_val[0] = d.prev_val[2] = "*x";
+  d.prev_val[1] = "not valid postage";  /* Guarantee an error.  */
+  d.prev_val[3] = "x";
+  d.val = "(*x)";
+  d.fn_wants_lvalue = true;
+
+  oprintf (d.of, "\n");
+  oprintf (d.of, "void\n");
+  oprintf (d.of, "gt_pch_p_");
+  output_mangled_typename (d.of, orig_s);
+  oprintf (d.of, " (ATTRIBUTE_UNUSED void *this_obj,\n"
+	   "\tvoid *x_p,\n"
+	   "\tATTRIBUTE_UNUSED gt_pointer_operator op,\n"
+	   "\tATTRIBUTE_UNUSED void *cookie)\n");
+  oprintf (d.of, "{\n");
+  oprintf (d.of, "  %s %s * const x ATTRIBUTE_UNUSED = (%s %s *)x_p;\n",
+	   s->kind == TYPE_UNION ? "union" : "struct", s->u.s.tag,
+	   s->kind == TYPE_UNION ? "union" : "struct", s->u.s.tag);
+  d.indent = 2;
+  walk_type (s, &d);
+  oprintf (d.of, "}\n");
+}
+
+/* Write out local marker routines for STRUCTURES and PARAM_STRUCTS.  */
+
+static void
+write_local (type_p structures, type_p param_structs)
+{
+  type_p s;
+
+  oprintf (header_file, "\n/* Local pointer-walking routines.  */\n");
+  for (s = structures; s; s = s->next)
+    if (s->gc_used == GC_POINTED_TO
+	|| s->gc_used == GC_MAYBE_POINTED_TO)
+      {
+	options_p opt;
+
+	if (s->u.s.line.file == NULL)
+	  continue;
+
+	for (opt = s->u.s.opt; opt; opt = opt->next)
+	  if (strcmp (opt->name, "ptr_alias") == 0)
+	    {
+	      const_type_p const t = (const_type_p) opt->info;
+	      if (t->kind == TYPE_STRUCT
+		  || t->kind == TYPE_UNION
+		  || t->kind == TYPE_LANG_STRUCT)
+		{
+		  oprintf (header_file, "#define gt_pch_p_");
+		  output_mangled_typename (header_file, s);
+		  oprintf (header_file, " gt_pch_p_");
+		  output_mangled_typename (header_file, t);
+		  oprintf (header_file, "\n");
+		}
+	      else
+		error_at_line (&s->u.s.line,
+			       "structure alias is not a structure");
+	      break;
+	    }
+	if (opt)
+	  continue;
+
+	/* Declare the marker procedure only once.  */
+	oprintf (header_file, "extern void gt_pch_p_");
+	output_mangled_typename (header_file, s);
+	oprintf (header_file,
+	 "\n    (void *, void *, gt_pointer_operator, void *);\n");
+
+	if (s->kind == TYPE_LANG_STRUCT)
+	  {
+	    type_p ss;
+	    for (ss = s->u.s.lang_struct; ss; ss = ss->next)
+	      write_local_func_for_structure (s, ss, NULL);
+	  }
+	else
+	  write_local_func_for_structure (s, s, NULL);
+      }
+
+  for (s = param_structs; s; s = s->next)
+    if (s->gc_used == GC_POINTED_TO)
+      {
+	type_p * param = s->u.param_struct.param;
+	type_p stru = s->u.param_struct.stru;
+
+	/* Declare the marker procedure.  */
+	oprintf (header_file, "extern void gt_pch_p_");
+	output_mangled_typename (header_file, s);
+	oprintf (header_file,
+	 "\n    (void *, void *, gt_pointer_operator, void *);\n");
+
+	if (stru->u.s.line.file == NULL)
+	  {
+	    fprintf (stderr, "warning: structure `%s' used but not defined\n",
+		     s->u.s.tag);
+	    continue;
+	  }
+
+	if (stru->kind == TYPE_LANG_STRUCT)
+	  {
+	    type_p ss;
+	    for (ss = stru->u.s.lang_struct; ss; ss = ss->next)
+	      write_local_func_for_structure (s, ss, param);
+	  }
+	else
+	  write_local_func_for_structure (s, stru, param);
+      }
+}
+
+/* Write out the 'enum' definition for gt_types_enum.  */
+
+static void
+write_enum_defn (type_p structures, type_p param_structs)
+{
+  type_p s;
+
+  oprintf (header_file, "\n/* Enumeration of types known.  */\n");
+  oprintf (header_file, "enum gt_types_enum {\n");
+  for (s = structures; s; s = s->next)
+    if (s->gc_used == GC_POINTED_TO
+	|| s->gc_used == GC_MAYBE_POINTED_TO)
+      {
+	if (s->gc_used == GC_MAYBE_POINTED_TO
+	    && s->u.s.line.file == NULL)
+	  continue;
+
+	oprintf (header_file, " gt_ggc_e_");
+	output_mangled_typename (header_file, s);
+	oprintf (header_file, ", \n");
+      }
+  for (s = param_structs; s; s = s->next)
+    if (s->gc_used == GC_POINTED_TO)
+      {
+	oprintf (header_file, " gt_e_");
+	output_mangled_typename (header_file, s);
+	oprintf (header_file, ", \n");
+      }
+  oprintf (header_file, " gt_types_enum_last\n");
+  oprintf (header_file, "};\n");
+}
+
+/* Might T contain any non-pointer elements?  */
+
+static int
+contains_scalar_p (type_p t)
+{
+  switch (t->kind)
+    {
+    case TYPE_STRING:
+    case TYPE_POINTER:
+      return 0;
+    case TYPE_ARRAY:
+      return contains_scalar_p (t->u.a.p);
+    default:
+      /* Could also check for structures that have no non-pointer
+	 fields, but there aren't enough of those to worry about.  */
+      return 1;
+    }
+}
+
+/* Mangle FN and print it to F.  */
+
+static void
+put_mangled_filename (outf_p f, const char *fn)
+{
+  const char *name = get_output_file_name (fn);
+  for (; *name != 0; name++)
+    if (ISALNUM (*name))
+      oprintf (f, "%c", *name);
+    else
+      oprintf (f, "%c", '_');
+}
+
+/* Finish off the currently-created root tables in FLP.  PFX, TNAME,
+   LASTNAME, and NAME are all strings to insert in various places in
+   the resulting code.  */
+
+static void
+finish_root_table (struct flist *flp, const char *pfx, const char *lastname,
+		   const char *tname, const char *name)
+{
+  struct flist *fli2;
+
+  for (fli2 = flp; fli2; fli2 = fli2->next)
+    if (fli2->started_p)
+      {
+	oprintf (fli2->f, "  %s\n", lastname);
+	oprintf (fli2->f, "};\n\n");
+      }
+
+  for (fli2 = flp; fli2; fli2 = fli2->next)
+    if (fli2->started_p)
+      {
+	lang_bitmap bitmap = get_lang_bitmap (fli2->name);
+	int fnum;
+
+	for (fnum = 0; bitmap != 0; fnum++, bitmap >>= 1)
+	  if (bitmap & 1)
+	    {
+	      oprintf (base_files[fnum],
+		       "extern const struct %s gt_%s_",
+		       tname, pfx);
+	      put_mangled_filename (base_files[fnum], fli2->name);
+	      oprintf (base_files[fnum], "[];\n");
+	    }
+      }
+
+  {
+    size_t fnum;
+    for (fnum = 0; fnum < num_lang_dirs; fnum++)
+      oprintf (base_files [fnum],
+	       "const struct %s * const %s[] = {\n",
+	       tname, name);
+  }
+
+
+  for (fli2 = flp; fli2; fli2 = fli2->next)
+    if (fli2->started_p)
+      {
+	lang_bitmap bitmap = get_lang_bitmap (fli2->name);
+	int fnum;
+
+	fli2->started_p = 0;
+
+	for (fnum = 0; bitmap != 0; fnum++, bitmap >>= 1)
+	  if (bitmap & 1)
+	    {
+	      oprintf (base_files[fnum], "  gt_%s_", pfx);
+	      put_mangled_filename (base_files[fnum], fli2->name);
+	      oprintf (base_files[fnum], ",\n");
+	    }
+      }
+
+  {
+    size_t fnum;
+    for (fnum = 0; fnum < num_lang_dirs; fnum++)
+      {
+	oprintf (base_files[fnum], "  NULL\n");
+	oprintf (base_files[fnum], "};\n");
+      }
+  }
+}
+
+/* Write out to F the table entry and any marker routines needed to
+   mark NAME as TYPE.  The original variable is V, at LINE.
+   HAS_LENGTH is nonzero iff V was a variable-length array.  IF_MARKED
+   is nonzero iff we are building the root table for hash table caches.  */
+
+static void
+write_root (outf_p f, pair_p v, type_p type, const char *name, int has_length,
+	    struct fileloc *line, const char *if_marked)
+{
+  switch (type->kind)
+    {
+    case TYPE_STRUCT:
+      {
+	pair_p fld;
+	for (fld = type->u.s.fields; fld; fld = fld->next)
+	  {
+	    int skip_p = 0;
+	    const char *desc = NULL;
+	    options_p o;
+
+	    for (o = fld->opt; o; o = o->next)
+	      if (strcmp (o->name, "skip") == 0)
+		skip_p = 1;
+	      else if (strcmp (o->name, "desc") == 0)
+		desc = o->info;
+	      else if (strcmp (o->name, "param_is") == 0)
+		;
+	      else
+		error_at_line (line,
+		       "field `%s' of global `%s' has unknown option `%s'",
+			       fld->name, name, o->name);
+
+	    if (skip_p)
+	      continue;
+	    else if (desc && fld->type->kind == TYPE_UNION)
+	      {
+		pair_p validf = NULL;
+		pair_p ufld;
+
+		for (ufld = fld->type->u.s.fields; ufld; ufld = ufld->next)
+		  {
+		    const char *tag = NULL;
+		    options_p oo;
+
+		    for (oo = ufld->opt; oo; oo = oo->next)
+		      if (strcmp (oo->name, "tag") == 0)
+			tag = oo->info;
+		    if (tag == NULL || strcmp (tag, desc) != 0)
+		      continue;
+		    if (validf != NULL)
+		      error_at_line (line,
+			   "both `%s.%s.%s' and `%s.%s.%s' have tag `%s'",
+				     name, fld->name, validf->name,
+				     name, fld->name, ufld->name,
+				     tag);
+		    validf = ufld;
+		  }
+		if (validf != NULL)
+		  {
+		    char *newname;
+		    newname = xasprintf ("%s.%s.%s",
+					 name, fld->name, validf->name);
+		    write_root (f, v, validf->type, newname, 0, line,
+				if_marked);
+		    free (newname);
+		  }
+	      }
+	    else if (desc)
+	      error_at_line (line,
+		     "global `%s.%s' has `desc' option but is not union",
+			     name, fld->name);
+	    else
+	      {
+		char *newname;
+		newname = xasprintf ("%s.%s", name, fld->name);
+		write_root (f, v, fld->type, newname, 0, line, if_marked);
+		free (newname);
+	      }
+	  }
+      }
+      break;
+
+    case TYPE_ARRAY:
+      {
+	char *newname;
+	newname = xasprintf ("%s[0]", name);
+	write_root (f, v, type->u.a.p, newname, has_length, line, if_marked);
+	free (newname);
+      }
+      break;
+
+    case TYPE_POINTER:
+      {
+	type_p ap, tp;
+
+	oprintf (f, "  {\n");
+	oprintf (f, "    &%s,\n", name);
+	oprintf (f, "    1");
+
+	for (ap = v->type; ap->kind == TYPE_ARRAY; ap = ap->u.a.p)
+	  if (ap->u.a.len[0])
+	    oprintf (f, " * (%s)", ap->u.a.len);
+	  else if (ap == v->type)
+	    oprintf (f, " * ARRAY_SIZE (%s)", v->name);
+	oprintf (f, ",\n");
+	oprintf (f, "    sizeof (%s", v->name);
+	for (ap = v->type; ap->kind == TYPE_ARRAY; ap = ap->u.a.p)
+	  oprintf (f, "[0]");
+	oprintf (f, "),\n");
+
+	tp = type->u.p;
+
+	if (! has_length && UNION_OR_STRUCT_P (tp))
+	  {
+	    oprintf (f, "    &gt_ggc_mx_%s,\n", tp->u.s.tag);
+	    oprintf (f, "    &gt_pch_nx_%s", tp->u.s.tag);
+	  }
+	else if (! has_length && tp->kind == TYPE_PARAM_STRUCT)
+	  {
+	    oprintf (f, "    &gt_ggc_m_");
+	    output_mangled_typename (f, tp);
+	    oprintf (f, ",\n    &gt_pch_n_");
+	    output_mangled_typename (f, tp);
+	  }
+	else if (has_length
+		 && (tp->kind == TYPE_POINTER || UNION_OR_STRUCT_P (tp)))
+	  {
+	    oprintf (f, "    &gt_ggc_ma_%s,\n", name);
+	    oprintf (f, "    &gt_pch_na_%s", name);
+	  }
+	else
+	  {
+	    error_at_line (line,
+			   "global `%s' is pointer to unimplemented type",
+			   name);
+	  }
+	if (if_marked)
+	  oprintf (f, ",\n    &%s", if_marked);
+	oprintf (f, "\n  },\n");
+      }
+      break;
+
+    case TYPE_STRING:
+      {
+	oprintf (f, "  {\n");
+	oprintf (f, "    &%s,\n", name);
+	oprintf (f, "    1, \n");
+	oprintf (f, "    sizeof (%s),\n", v->name);
+	oprintf (f, "    (gt_pointer_walker) &gt_ggc_m_S,\n");
+	oprintf (f, "    (gt_pointer_walker) &gt_pch_n_S\n");
+	oprintf (f, "  },\n");
+      }
+      break;
+
+    case TYPE_SCALAR:
+      break;
+
+    default:
+      error_at_line (line,
+		     "global `%s' is unimplemented type",
+		     name);
+    }
+}
+
+/* This generates a routine to walk an array.  */
+
+static void
+write_array (outf_p f, pair_p v, const struct write_types_data *wtd)
+{
+  struct walk_type_data d;
+  char *prevval3;
+
+  memset (&d, 0, sizeof (d));
+  d.of = f;
+  d.cookie = wtd;
+  d.indent = 2;
+  d.line = &v->line;
+  d.opt = v->opt;
+  d.bitmap = get_lang_bitmap (v->line.file);
+  d.param = NULL;
+
+  d.prev_val[3] = prevval3 = xasprintf ("&%s", v->name);
+
+  if (wtd->param_prefix)
+    {
+      oprintf (f, "static void gt_%sa_%s\n", wtd->param_prefix, v->name);
+      oprintf (f,
+       "    (void *, void *, gt_pointer_operator, void *);\n");
+      oprintf (f, "static void gt_%sa_%s (ATTRIBUTE_UNUSED void *this_obj,\n",
+	       wtd->param_prefix, v->name);
+      oprintf (d.of,
+	       "      ATTRIBUTE_UNUSED void *x_p,\n"
+	       "      ATTRIBUTE_UNUSED gt_pointer_operator op,\n"
+	       "      ATTRIBUTE_UNUSED void * cookie)\n");
+      oprintf (d.of, "{\n");
+      d.prev_val[0] = d.prev_val[1] = d.prev_val[2] = d.val = v->name;
+      d.process_field = write_types_local_process_field;
+      walk_type (v->type, &d);
+      oprintf (f, "}\n\n");
+    }
+
+  d.opt = v->opt;
+  oprintf (f, "static void gt_%sa_%s (void *);\n",
+	   wtd->prefix, v->name);
+  oprintf (f, "static void\ngt_%sa_%s (ATTRIBUTE_UNUSED void *x_p)\n",
+	   wtd->prefix, v->name);
+  oprintf (f, "{\n");
+  d.prev_val[0] = d.prev_val[1] = d.prev_val[2] = d.val = v->name;
+  d.process_field = write_types_process_field;
+  walk_type (v->type, &d);
+  free (prevval3);
+  oprintf (f, "}\n\n");
+}
+
+/* Output a table describing the locations and types of VARIABLES.  */
+
+static void
+write_roots (pair_p variables)
+{
+  pair_p v;
+  struct flist *flp = NULL;
+
+  for (v = variables; v; v = v->next)
+    {
+      outf_p f = get_output_file_with_visibility (v->line.file);
+      struct flist *fli;
+      const char *length = NULL;
+      int deletable_p = 0;
+      options_p o;
+
+      for (o = v->opt; o; o = o->next)
+	if (strcmp (o->name, "length") == 0)
+	  length = o->info;
+	else if (strcmp (o->name, "deletable") == 0)
+	  deletable_p = 1;
+	else if (strcmp (o->name, "param_is") == 0)
+	  ;
+	else if (strncmp (o->name, "param", 5) == 0
+		 && ISDIGIT (o->name[5])
+		 && strcmp (o->name + 6, "_is") == 0)
+	  ;
+	else if (strcmp (o->name, "if_marked") == 0)
+	  ;
+	else
+	  error_at_line (&v->line,
+			 "global `%s' has unknown option `%s'",
+			 v->name, o->name);
+
+      for (fli = flp; fli; fli = fli->next)
+	if (fli->f == f)
+	  break;
+      if (fli == NULL)
+	{
+	  fli = XNEW (struct flist);
+	  fli->f = f;
+	  fli->next = flp;
+	  fli->started_p = 0;
+	  fli->name = v->line.file;
+	  flp = fli;
+
+	  oprintf (f, "\n/* GC roots.  */\n\n");
+	}
+
+      if (! deletable_p
+	  && length
+	  && v->type->kind == TYPE_POINTER
+	  && (v->type->u.p->kind == TYPE_POINTER
+	      || v->type->u.p->kind == TYPE_STRUCT))
+	{
+	  write_array (f, v, &ggc_wtd);
+	  write_array (f, v, &pch_wtd);
+	}
+    }
+
+  for (v = variables; v; v = v->next)
+    {
+      outf_p f = get_output_file_with_visibility (v->line.file);
+      struct flist *fli;
+      int skip_p = 0;
+      int length_p = 0;
+      options_p o;
+
+      for (o = v->opt; o; o = o->next)
+	if (strcmp (o->name, "length") == 0)
+	  length_p = 1;
+	else if (strcmp (o->name, "deletable") == 0
+		 || strcmp (o->name, "if_marked") == 0)
+	  skip_p = 1;
+
+      if (skip_p)
+	continue;
+
+      for (fli = flp; fli; fli = fli->next)
+	if (fli->f == f)
+	  break;
+      if (! fli->started_p)
+	{
+	  fli->started_p = 1;
+
+	  oprintf (f, "const struct ggc_root_tab gt_ggc_r_");
+	  put_mangled_filename (f, v->line.file);
+	  oprintf (f, "[] = {\n");
+	}
+
+      write_root (f, v, v->type, v->name, length_p, &v->line, NULL);
+    }
+
+  finish_root_table (flp, "ggc_r", "LAST_GGC_ROOT_TAB", "ggc_root_tab",
+		     "gt_ggc_rtab");
+
+  for (v = variables; v; v = v->next)
+    {
+      outf_p f = get_output_file_with_visibility (v->line.file);
+      struct flist *fli;
+      int skip_p = 1;
+      options_p o;
+
+      for (o = v->opt; o; o = o->next)
+	if (strcmp (o->name, "deletable") == 0)
+	  skip_p = 0;
+	else if (strcmp (o->name, "if_marked") == 0)
+	  skip_p = 1;
+
+      if (skip_p)
+	continue;
+
+      for (fli = flp; fli; fli = fli->next)
+	if (fli->f == f)
+	  break;
+      if (! fli->started_p)
+	{
+	  fli->started_p = 1;
+
+	  oprintf (f, "const struct ggc_root_tab gt_ggc_rd_");
+	  put_mangled_filename (f, v->line.file);
+	  oprintf (f, "[] = {\n");
+	}
+
+      oprintf (f, "  { &%s, 1, sizeof (%s), NULL, NULL },\n",
+	       v->name, v->name);
+    }
+
+  finish_root_table (flp, "ggc_rd", "LAST_GGC_ROOT_TAB", "ggc_root_tab",
+		     "gt_ggc_deletable_rtab");
+
+  for (v = variables; v; v = v->next)
+    {
+      outf_p f = get_output_file_with_visibility (v->line.file);
+      struct flist *fli;
+      const char *if_marked = NULL;
+      int length_p = 0;
+      options_p o;
+
+      for (o = v->opt; o; o = o->next)
+	if (strcmp (o->name, "length") == 0)
+	  length_p = 1;
+	else if (strcmp (o->name, "if_marked") == 0)
+	  if_marked = o->info;
+
+      if (if_marked == NULL)
+	continue;
+
+      if (v->type->kind != TYPE_POINTER
+	  || v->type->u.p->kind != TYPE_PARAM_STRUCT
+	  || v->type->u.p->u.param_struct.stru != find_structure ("htab", 0))
+	{
+	  error_at_line (&v->line, "if_marked option used but not hash table");
+	  continue;
+	}
+
+      for (fli = flp; fli; fli = fli->next)
+	if (fli->f == f)
+	  break;
+      if (! fli->started_p)
+	{
+	  fli->started_p = 1;
+
+	  oprintf (f, "const struct ggc_cache_tab gt_ggc_rc_");
+	  put_mangled_filename (f, v->line.file);
+	  oprintf (f, "[] = {\n");
+	}
+
+      write_root (f, v, v->type->u.p->u.param_struct.param[0],
+		     v->name, length_p, &v->line, if_marked);
+    }
+
+  finish_root_table (flp, "ggc_rc", "LAST_GGC_CACHE_TAB", "ggc_cache_tab",
+		     "gt_ggc_cache_rtab");
+
+  for (v = variables; v; v = v->next)
+    {
+      outf_p f = get_output_file_with_visibility (v->line.file);
+      struct flist *fli;
+      int length_p = 0;
+      int if_marked_p = 0;
+      options_p o;
+
+      for (o = v->opt; o; o = o->next)
+	if (strcmp (o->name, "length") == 0)
+	  length_p = 1;
+	else if (strcmp (o->name, "if_marked") == 0)
+	  if_marked_p = 1;
+
+      if (! if_marked_p)
+	continue;
+
+      for (fli = flp; fli; fli = fli->next)
+	if (fli->f == f)
+	  break;
+      if (! fli->started_p)
+	{
+	  fli->started_p = 1;
+
+	  oprintf (f, "const struct ggc_root_tab gt_pch_rc_");
+	  put_mangled_filename (f, v->line.file);
+	  oprintf (f, "[] = {\n");
+	}
+
+      write_root (f, v, v->type, v->name, length_p, &v->line, NULL);
+    }
+
+  finish_root_table (flp, "pch_rc", "LAST_GGC_ROOT_TAB", "ggc_root_tab",
+		     "gt_pch_cache_rtab");
+
+  for (v = variables; v; v = v->next)
+    {
+      outf_p f = get_output_file_with_visibility (v->line.file);
+      struct flist *fli;
+      int skip_p = 0;
+      options_p o;
+
+      for (o = v->opt; o; o = o->next)
+	if (strcmp (o->name, "deletable") == 0
+	    || strcmp (o->name, "if_marked") == 0)
+	  skip_p = 1;
+
+      if (skip_p)
+	continue;
+
+      if (! contains_scalar_p (v->type))
+	continue;
+
+      for (fli = flp; fli; fli = fli->next)
+	if (fli->f == f)
+	  break;
+      if (! fli->started_p)
+	{
+	  fli->started_p = 1;
+
+	  oprintf (f, "const struct ggc_root_tab gt_pch_rs_");
+	  put_mangled_filename (f, v->line.file);
+	  oprintf (f, "[] = {\n");
+	}
+
+      oprintf (f, "  { &%s, 1, sizeof (%s), NULL, NULL },\n",
+	       v->name, v->name);
+    }
+
+  finish_root_table (flp, "pch_rs", "LAST_GGC_ROOT_TAB", "ggc_root_tab",
+		     "gt_pch_scalar_rtab");
+}
+
+/* Record the definition of a generic VEC structure, as if we had expanded
+   the macros in vec.h:
+
+   typedef struct VEC_<type>_base GTY(()) {
+   unsigned num;
+   unsigned alloc;
+   <type> GTY((length ("%h.num"))) vec[1];
+   } VEC_<type>_base
+
+   where the GTY(()) tags are only present if is_scalar is _false_.  */
+
+void
+note_def_vec (const char *type_name, bool is_scalar, struct fileloc *pos)
+{
+  pair_p fields;
+  type_p t;
+  options_p o;
+  type_p len_ty = create_scalar_type ("unsigned");
+  const char *name = concat ("VEC_", type_name, "_base", (char *)0);
+
+  if (is_scalar)
+    {
+      t = create_scalar_type (type_name);
+      o = 0;
+    }
+  else
+    {
+      t = resolve_typedef (type_name, pos);
+      o = create_option (0, "length", "%h.num");
+    }
+
+  /* We assemble the field list in reverse order.  */
+  fields = create_field_at (0, create_array (t, "1"), "vec", o, pos);
+  fields = create_field_at (fields, len_ty, "alloc", 0, pos);
+  fields = create_field_at (fields, len_ty, "num", 0, pos);
+
+  do_typedef (name, new_structure (name, 0, pos, fields, 0), pos);
+}
+
+/* Record the definition of an allocation-specific VEC structure, as if
+   we had expanded the macros in vec.h:
+
+   typedef struct VEC_<type>_<astrat> {
+     VEC_<type>_base base;
+   } VEC_<type>_<astrat>;
+*/
+void
+note_def_vec_alloc (const char *type, const char *astrat, struct fileloc *pos)
+{
+  const char *astratname = concat ("VEC_", type, "_", astrat, (char *)0);
+  const char *basename = concat ("VEC_", type, "_base", (char *)0);
+
+  pair_p field = create_field_at (0, resolve_typedef (basename, pos),
+				  "base", 0, pos);
+
+  do_typedef (astratname, new_structure (astratname, 0, pos, field, 0), pos);
+}
+
+
+int
+main (int argc, char **argv)
+{
+  size_t i;
+  static struct fileloc pos = { this_file, 0 };
+
+  /* fatal uses this */
+  progname = "gengtype";
+
+  if (argc != 3)
+    fatal ("usage: gengtype srcdir input-list");
+
+  srcdir = argv[1];
+  srcdir_len = strlen (srcdir);
+
+  read_input_list (argv[2]);
+  if (hit_error)
+    return 1;
+
+  scalar_char.u.scalar_is_char = true;
+  scalar_nonchar.u.scalar_is_char = false;
+  gen_rtx_next ();
+
+  /* These types are set up with #define or else outside of where
+     we can see them.  */
+  pos.line = __LINE__ + 1;
+  do_scalar_typedef ("CUMULATIVE_ARGS", &pos); pos.line++;
+  do_scalar_typedef ("REAL_VALUE_TYPE", &pos); pos.line++;
+  do_scalar_typedef ("FIXED_VALUE_TYPE", &pos); pos.line++;
+  do_scalar_typedef ("double_int", &pos); pos.line++;
+  do_scalar_typedef ("uint8", &pos); pos.line++;
+  do_scalar_typedef ("jword", &pos); pos.line++;
+  do_scalar_typedef ("JCF_u2", &pos); pos.line++;
+  do_scalar_typedef ("void", &pos); pos.line++;
+  do_typedef ("PTR", create_pointer (resolve_typedef ("void", &pos)), &pos);
+
+  for (i = 0; i < num_gt_files; i++)
+    parse_file (gt_files[i]);
+
+  if (hit_error)
+    return 1;
+
+  set_gc_used (variables);
+
+  open_base_files ();
+  write_enum_defn (structures, param_structs);
+  write_types (structures, param_structs, &ggc_wtd);
+  write_types (structures, param_structs, &pch_wtd);
+  write_local (structures, param_structs);
+  write_roots (variables);
+  write_rtx_next ();
+  close_output_files ();
+
+  if (hit_error)
+    return 1;
+  return 0;
+}