/* Portable data dumper for XEmacs.
   Copyright (C) 1999-2000 Olivier Galibert
   Copyright (C) 2001 Martin Buchholz
   Copyright (C) 2001, 2002, 2003 Ben Wing.

This file is part of XEmacs.

XEmacs 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 2, or (at your option) any
later version.

XEmacs 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 XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: Not in FSF. */

/* !!#### Not yet Mule-ized */

#include <config.h>
#include "lisp.h"

#include "specifier.h"
#include "file-coding.h"
#include "elhash.h"
#include "lstream.h"
#include "sysfile.h"
#include "console-stream.h"

#ifdef WIN32_NATIVE
#include "syswindows.h"
#else
#ifdef HAVE_MMAP
#include <sys/mman.h>
#endif
#include "dump-data.h"
#endif

typedef struct
{
  const void *varaddress;
  Bytecount size;
  const struct memory_description *desc;
} pdump_root_block;

typedef struct
{
  Dynarr_declare (pdump_root_block);
} pdump_root_block_dynarr;

typedef struct
{
  void **ptraddress;
  const struct sized_memory_description *desc;
} pdump_root_struct_ptr;

typedef struct
{
  Dynarr_declare (pdump_root_struct_ptr);
} pdump_root_struct_ptr_dynarr;

typedef struct
{
  Lisp_Object *address;
  Lisp_Object value;
} pdump_static_Lisp_Object;

typedef struct
{
  char **address; /* char * for ease of doing relocation */
  char * value;
} pdump_static_pointer;

static pdump_root_block_dynarr *pdump_root_blocks;
static pdump_root_struct_ptr_dynarr *pdump_root_struct_ptrs;
static Lisp_Object_ptr_dynarr *pdump_root_lisp_objects;
static Lisp_Object_ptr_dynarr *pdump_weak_object_chains;

/* Mark SIZE bytes at non-heap address VARADDRESS for dumping, described
   by DESC. */
void
dump_add_root_block (const void *varaddress, Bytecount size,
		     const struct memory_description *desc)
{
  pdump_root_block info;
  info.varaddress = varaddress;
  info.size = size;
  info.desc = desc;
  if (pdump_root_blocks == NULL)
    pdump_root_blocks = Dynarr_new (pdump_root_block);
  Dynarr_add (pdump_root_blocks, info);
}

/* Mark the struct described by DESC and pointed to by the pointer at
   non-heap address VARADDRESS for dumping.
   All the objects reachable from this pointer will also be dumped. */
void
dump_add_root_struct_ptr (void *ptraddress,
			  const struct sized_memory_description *desc)
{
  pdump_root_struct_ptr info;
  info.ptraddress = (void **) ptraddress;
  info.desc = desc;
  if (pdump_root_struct_ptrs == NULL)
    pdump_root_struct_ptrs = Dynarr_new (pdump_root_struct_ptr);
  Dynarr_add (pdump_root_struct_ptrs, info);
}

/* Mark the Lisp_Object at non-heap address VARADDRESS for dumping.
   All the objects reachable from this var will also be dumped. */
void
dump_add_root_lisp_object (Lisp_Object *varaddress)
{
  if (pdump_root_lisp_objects == NULL)
    pdump_root_lisp_objects = Dynarr_new2 (Lisp_Object_ptr_dynarr, Lisp_Object *);
  Dynarr_add (pdump_root_lisp_objects, varaddress);
}

/* Mark the list pointed to by the Lisp_Object at VARADDRESS for dumping. */
void
dump_add_weak_object_chain (Lisp_Object *varaddress)
{
  if (pdump_weak_object_chains == NULL)
    pdump_weak_object_chains = Dynarr_new2 (Lisp_Object_ptr_dynarr, Lisp_Object *);
  Dynarr_add (pdump_weak_object_chains, varaddress);
}


inline static void
pdump_align_stream (FILE *stream, Bytecount alignment)
{
  long offset = ftell (stream);
  long adjustment = ALIGN_SIZE (offset, alignment) - offset;
  if (adjustment)
    fseek (stream, adjustment, SEEK_CUR);
}

#define PDUMP_ALIGN_OUTPUT(type) pdump_align_stream (pdump_out, ALIGNOF (type))

#define PDUMP_WRITE(type, object) \
retry_fwrite (&object, sizeof (object), 1, pdump_out);

#define PDUMP_WRITE_ALIGNED(type, object) do {	\
  PDUMP_ALIGN_OUTPUT (type);			\
  PDUMP_WRITE (type, object);			\
} while (0)

#define PDUMP_READ(ptr, type) \
(((type *) (ptr = (char*) (((type *) ptr) + 1)))[-1])

#define PDUMP_READ_ALIGNED(ptr, type) \
((ptr = (char *) ALIGN_PTR (ptr, type)), PDUMP_READ (ptr, type))



typedef struct
{
  const struct memory_description *desc;
  int count;
} pdump_reloc_table;

static char *pdump_rt_list = 0;

void
pdump_objects_unmark (void)
{
  int i;
  char *p = pdump_rt_list;
  if (p)
    for (;;)
      {
	pdump_reloc_table *rt = (pdump_reloc_table *)p;
	p += sizeof (pdump_reloc_table);
	if (rt->desc)
	  {
	    for (i=0; i<rt->count; i++)
	      {
		struct lrecord_header *lh = * (struct lrecord_header **) p;
		if (! C_READONLY_RECORD_HEADER_P (lh))
		  UNMARK_RECORD_HEADER (lh);
		p += sizeof (EMACS_INT);
	      }
	  } else
	    break;
      }
}


/* The structure of the dump file looks like this:
 0		- header
		- dumped objects
 stab_offset	- nb_root_struct_ptrs*struct(void *, adr)
		  for global pointers to structures
		- nb_root_blocks*struct(void *, size, info) for global
		  objects to restore
		- relocation table
		- root lisp object address/value couples with the count
		  preceding the list
 */


#define PDUMP_SIGNATURE "XEmacsDP"
#define PDUMP_SIGNATURE_LEN (sizeof (PDUMP_SIGNATURE) - 1)

typedef struct
{
  char signature[PDUMP_SIGNATURE_LEN];
  unsigned int id;
  EMACS_UINT stab_offset;
  EMACS_UINT reloc_address;
  int nb_root_struct_ptrs;
  int nb_root_blocks;
} pdump_header;

char *pdump_start;
char *pdump_end;
static Bytecount pdump_length;

#ifdef WIN32_NATIVE
/* Handle for the dump file */
static HANDLE pdump_hFile = INVALID_HANDLE_VALUE;
/* Handle for the file mapping object for the dump file */
static HANDLE pdump_hMap = INVALID_HANDLE_VALUE;
#endif

static void (*pdump_free) (void);

static unsigned char pdump_align_table[] =
{
  64, 1, 2, 1, 4, 1, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1,
  16, 1, 2, 1, 4, 1, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1,
  32, 1, 2, 1, 4, 1, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1,
  16, 1, 2, 1, 4, 1, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1
};

static inline int
pdump_size_to_align (Bytecount size)
{
  return pdump_align_table[size % countof (pdump_align_table)];
}

typedef struct pdump_entry_list_elt
{
  struct pdump_entry_list_elt *next;
  const void *obj;
  Bytecount size;
  int count;
  EMACS_INT save_offset;
} pdump_entry_list_elt;

typedef struct
{
  pdump_entry_list_elt *first;
  int align;
  int count;
} pdump_entry_list;

typedef struct pdump_struct_list_elt
{
  pdump_entry_list list;
  const struct memory_description *desc;
} pdump_struct_list_elt;

typedef struct
{
  pdump_struct_list_elt *list;
  int count;
  int size;
} pdump_struct_list;

static pdump_entry_list *pdump_object_table;
static pdump_entry_list pdump_opaque_data_list;
static pdump_struct_list pdump_struct_table;

static int *pdump_alert_undump_object;

static unsigned long cur_offset;
static Bytecount max_size;
static int pdump_fd;
static void *pdump_buf;
static FILE *pdump_out;

#define PDUMP_HASHSIZE 200001

static pdump_entry_list_elt **pdump_hash;

/* Since most pointers are eight bytes aligned, the >>3 allows for a better hash */
static int
pdump_make_hash (const void *obj)
{
  return ((unsigned long)(obj)>>3) % PDUMP_HASHSIZE;
}

static pdump_entry_list_elt *
pdump_get_entry (const void *obj)
{
  int pos = pdump_make_hash (obj);
  pdump_entry_list_elt *e;

  assert (obj != 0);

  while ((e = pdump_hash[pos]) != 0)
    {
      if (e->obj == obj)
	return e;

      pos++;
      if (pos == PDUMP_HASHSIZE)
	pos = 0;
    }
  return 0;
}

static void
pdump_add_entry (pdump_entry_list *list, const void *obj, Bytecount size,
		 int count)
{
  pdump_entry_list_elt *e;
  int pos = pdump_make_hash (obj);

  while ((e = pdump_hash[pos]) != 0)
    {
      if (e->obj == obj)
	return;

      pos++;
      if (pos == PDUMP_HASHSIZE)
	pos = 0;
    }

  e = xnew (pdump_entry_list_elt);

  e->next = list->first;
  e->obj = obj;
  e->size = size;
  e->count = count;
  list->first = e;

  list->count += count;
  pdump_hash[pos] = e;

  {
    int align = pdump_size_to_align (size);

    if (align < list->align)
      list->align = align;
  }
}

static pdump_entry_list *
pdump_get_entry_list (const struct memory_description *desc)
{
  int i;
  for (i=0; i<pdump_struct_table.count; i++)
    if (pdump_struct_table.list[i].desc == desc)
      return &pdump_struct_table.list[i].list;

  if (pdump_struct_table.size <= pdump_struct_table.count)
    {
      if (pdump_struct_table.size == -1)
	pdump_struct_table.size = 10;
      else
	pdump_struct_table.size = pdump_struct_table.size * 2;
      pdump_struct_table.list = (pdump_struct_list_elt *)
	xrealloc (pdump_struct_table.list,
		  pdump_struct_table.size * sizeof (pdump_struct_list_elt));
    }
  pdump_struct_table.list[pdump_struct_table.count].list.first = 0;
  pdump_struct_table.list[pdump_struct_table.count].list.align = ALIGNOF (max_align_t);
  pdump_struct_table.list[pdump_struct_table.count].list.count = 0;
  pdump_struct_table.list[pdump_struct_table.count].desc = desc;

  return &pdump_struct_table.list[pdump_struct_table.count++].list;
}

static struct
{
  struct lrecord_header *obj;
  int position;
  int offset;
} backtrace[65536];

static int pdump_depth;

void
pdump_backtrace (void)
{
  int i;
  stderr_out ("pdump backtrace :\n");
  for (i = 0; i < pdump_depth; i++)
    {
      if (!backtrace[i].obj)
	stderr_out ("  - ind. (%d, %d)\n",
		    backtrace[i].position,
		    backtrace[i].offset);
      else
	{
	  stderr_out ("  - %s (%d, %d)\n",
		      LHEADER_IMPLEMENTATION (backtrace[i].obj)->name,
		      backtrace[i].position,
		      backtrace[i].offset);
	}
    }
}

static void
pdump_unsupported_dump_type (enum memory_description_type type,
			     int do_backtrace)
{
  stderr_out ("Unsupported dump type : %d\n", type);
#ifdef WIN32_NATIVE
  stderr_out ("Are you compiling with SUPPORT_EDIT_AND_CONTINUE?\n");
  stderr_out ("See the PROBLEMS file.\n");
#endif
  if (do_backtrace)
    pdump_backtrace ();
  abort ();
}

static void
pdump_bump_depth (void)
{
  int me = pdump_depth++;
  if (me > 65536)
    {
      stderr_out ("Backtrace overflow, loop ?\n");
      abort ();
    }
  backtrace[me].obj = 0;
  backtrace[me].position = 0;
  backtrace[me].offset = 0;
}

static void pdump_register_object (Lisp_Object obj);
static void pdump_register_struct_contents (const void *data,
					    const struct sized_memory_description *
					    sdesc,
					    int count);
static void pdump_register_struct (const void *data,
				   const struct sized_memory_description *sdesc,
				   int count);

static void
pdump_register_sub (const void *data, const struct memory_description *desc)
{
  int pos;
  int me = pdump_depth - 1;

  for (pos = 0; desc[pos].type != XD_END; pos++)
    {
      const struct memory_description *desc1 = &desc[pos];
      EMACS_INT offset = lispdesc_indirect_count (desc1->offset, desc,
						  data);
      const void *rdata = (const char *) data + offset;

      backtrace[me].position = pos;
      backtrace[me].offset = offset;

    union_switcheroo:

      /* If the flag says don't dump, then don't dump. */
      if ((desc1->flags) & XD_FLAG_NO_PDUMP)
	continue;

      switch (desc1->type)
	{
	case XD_BYTECOUNT:
	case XD_ELEMCOUNT:
	case XD_HASHCODE:
	case XD_INT:
	case XD_LONG:
	case XD_INT_RESET:
	case XD_LO_LINK:
	  break;
	case XD_OPAQUE_DATA_PTR:
	  {
	    EMACS_INT count = lispdesc_indirect_count (desc1->data1, desc,
						       data);

	    pdump_add_entry (&pdump_opaque_data_list,
			     *(void **)rdata, count, 1);
	    break;
	  }
	case XD_C_STRING:
	  {
	    const char *str = * (const char **) rdata;
	    if (str)
	      pdump_add_entry (&pdump_opaque_data_list, str, strlen (str) + 1,
			       1);
	    break;
	  }
	case XD_DOC_STRING:
	  {
	    const char *str = * (const char **) rdata;
	    if ((EMACS_INT) str > 0)
	      pdump_add_entry (&pdump_opaque_data_list, str, strlen (str) + 1,
			       1);
	    break;
	  }
	case XD_LISP_OBJECT:
	  {
	    const Lisp_Object *pobj = (const Lisp_Object *) rdata;

	    assert (desc1->data1 == 0);

	    backtrace[me].offset = (const char *) pobj - (const char *) data;
	    pdump_register_object (*pobj);
	    break;
	  }
	case XD_LISP_OBJECT_ARRAY:
	  {
	    int i;
	    EMACS_INT count = lispdesc_indirect_count (desc1->data1, desc,
						       data);

	    for (i = 0; i < count; i++)
	      {
		const Lisp_Object *pobj = ((const Lisp_Object *) rdata) + i;
		Lisp_Object dobj = *pobj;

		backtrace[me].offset =
		  (const char *) pobj - (const char *) data;
		pdump_register_object (dobj);
	      }
	    break;
	  }
	case XD_STRUCT_PTR:
	  {
	    EMACS_INT count = lispdesc_indirect_count (desc1->data1, desc,
						       data);
	    const struct sized_memory_description *sdesc =
	      lispdesc_indirect_description (data, desc1->data2);
	    const char *dobj = *(const char **)rdata;
	    if (dobj)
	      pdump_register_struct (dobj, sdesc, count);
	    break;
	  }
	case XD_STRUCT_ARRAY:
	  {
	    EMACS_INT count = lispdesc_indirect_count (desc1->data1, desc,
						       data);
	    const struct sized_memory_description *sdesc =
	      lispdesc_indirect_description (data, desc1->data2);

	    pdump_register_struct_contents (rdata, sdesc, count);
	    break;
	  }
	case XD_UNION:
	case XD_UNION_DYNAMIC_SIZE:
	  desc1 = lispdesc_process_xd_union (desc1, desc, data);
	  if (desc1)
	    goto union_switcheroo;
	  break;

	default:
	  pdump_unsupported_dump_type (desc1->type, 1);
	}
    }
}

static void
pdump_register_object (Lisp_Object obj)
{
  struct lrecord_header *objh;
  const struct lrecord_implementation *imp;

  if (!POINTER_TYPE_P (XTYPE (obj)))
    return;

  objh = XRECORD_LHEADER (obj);
  if (!objh)
    return;

  if (pdump_get_entry (objh))
    return;

  imp = LHEADER_IMPLEMENTATION (objh);

  if (imp->description
      && RECORD_DUMPABLE (objh))
    {
      pdump_bump_depth ();
      backtrace[pdump_depth - 1].obj = objh;
      pdump_add_entry (pdump_object_table + objh->type,
		       objh, detagged_lisp_object_size (objh), 1);
      pdump_register_sub (objh, imp->description);
      --pdump_depth;
    }
  else
    {
      pdump_alert_undump_object[objh->type]++;
      stderr_out ("Undumpable object type : %s\n", imp->name);
      pdump_backtrace ();
    }
}

/* Register the referenced objects in the array of COUNT objects of
   located at DATA; each object is described by SDESC.  "Object" here
   simply means any block of memory; it need not actually be a C
   "struct".  It could be a single integer or Lisp_Object, for
   example, as long as the description is accurate.

   This does not register the block of memory itself; it may, for
   example, be an array of structures inlined in another memory block
   and thus should not be registered.  See pdump_register_struct(),
   which does register the memory block. */

static void
pdump_register_struct_contents (const void *data,
				const struct sized_memory_description *sdesc,
				int count)

{
  int i;
  Bytecount elsize;

  pdump_bump_depth ();
  elsize = lispdesc_structure_size (data, sdesc);
  for (i = 0; i < count; i++)
    {
      pdump_register_sub (((char *) data) + elsize * i, sdesc->description);
    }
  --pdump_depth;
}

/* Register the array of COUNT objects of located at DATA; each object is
   described by SDESC.  "Object" here simply means any block of memory;
   it need not actually be a C "struct".  It could be a single integer
   or Lisp_Object, for example, as long as the description is accurate.

   This is like pdump_register_struct_contents() but also registers
   the memory block itself. */

static void
pdump_register_struct (const void *data,
		       const struct sized_memory_description *sdesc,
		       int count)
{
  if (data && !pdump_get_entry (data))
    {
      pdump_add_entry (pdump_get_entry_list (sdesc->description), data,
		       lispdesc_structure_size (data, sdesc), count);

      pdump_register_struct_contents (data, sdesc, count);
    }
}

/* Store the already-calculated new pointer offsets for all pointers in the
   COUNT contiguous blocks of memory, each described by DESC and of size
   SIZE, whose original is located at ORIG_DATA and the modifiable copy at
   DATA.  We examine the description to figure out where the pointers are,
   and then look up the replacement values using pdump_get_entry().

   This is done just before writing the modified block of memory to the
   dump file.  The new pointer offsets have been carefully calculated so
   that the data being pointed gets written at that offset in the dump
   file.  That way, the dump file is a correct memory image except perhaps
   for a constant that needs to be added to all pointers. (#### In fact, we
   SHOULD be starting up a dumped XEmacs, seeing where the dumped file gets
   loaded into memory, and then rewriting the dumped file after relocating
   all the pointers relative to this memory location.  That way, if the
   file gets loaded again at the same location, which will be common, we
   don't have to do any relocating, which is both faster at startup and
   allows the read-only part of the dumped data to be shared read-only
   between different invocations of XEmacs.)

   #### Do we distinguish between read-only and writable dumped data?
   Should we?  It's tricky because the dumped data, once loaded again,
   cannot really be free()d or garbage collected since it's all stored in
   one contiguous block of data with no malloc() headers, and we don't keep
   track of the pointers used internally in malloc() and the Lisp allocator
   to track allocated blocks of memory. */

static void
pdump_store_new_pointer_offsets (int count, void *data, const void *orig_data,
				 const struct memory_description *desc,
				 int size)
{
  int pos, i;
  /* Process each block one by one */
  for (i = 0; i < count; i++)
    {
      /* CUR points to the beginning of each block in the new data. */
      char *cur = ((char *)data) + i*size;
      /* Scan each line of the description for relocatable pointers */
      for (pos = 0; desc[pos].type != XD_END; pos++)
	{
	  /* RDATA points to the beginning of each element in the new data. */
	  const struct memory_description *desc1 = &desc[pos];
	  /* #### Change ORIG_DATA to DATA.  See below. */
	  void *rdata = cur + lispdesc_indirect_count (desc1->offset, desc,
						       orig_data);
	union_switcheroo:

	  /* If the flag says don't dump, then don't dump. */
	  if ((desc1->flags) & XD_FLAG_NO_PDUMP)
	    continue;

	  switch (desc1->type)
	    {
	    case XD_BYTECOUNT:
	    case XD_ELEMCOUNT:
	    case XD_HASHCODE:
	    case XD_INT:
	    case XD_LONG:
	      break;
	    case XD_INT_RESET:
	      {
		EMACS_INT val = lispdesc_indirect_count (desc1->data1, desc,
							 orig_data);
		* (int *) rdata = val;
		break;
	      }
	    case XD_OPAQUE_DATA_PTR:
	    case XD_C_STRING:
	    case XD_STRUCT_PTR:
	      {
		void *ptr = * (void **) rdata;
		if (ptr)
		  * (EMACS_INT *) rdata = pdump_get_entry (ptr)->save_offset;
		break;
	      }
	    case XD_LO_LINK:
	      {
		/* As described in lrecord.h, this is a weak link.
                   Thus, we need to link this object not (necessarily)
                   to the object directly pointed to, but to the next
                   referenced object in the chain.  None of the
                   intermediate objects will be written out, so we
                   traverse down the chain of objects until we find a
                   referenced one. (The Qnil or Qunbound that ends the
                   chain will always be a referenced object.) */
		Lisp_Object obj = * (Lisp_Object *) rdata;
		pdump_entry_list_elt *elt1;
		/* #### Figure out how to handle indirect offsets here.
		   #### In general, when computing indirect counts, do we
		   really need to use the orig_data pointer?  Why not just
		   use the new stuff?

		   No, we don't usually need orig_data.  We only need it
		   when fetching pointers out of the data, not integers.
		   This currently occurs only with description maps.  We
		   should change the other places to DATA to emphasize
		   this. */
		assert (!XD_IS_INDIRECT (desc1->offset));
		for (;;)
		  {
		    elt1 = pdump_get_entry (XRECORD_LHEADER (obj));
		    if (elt1)
		      break;
		    obj = * (Lisp_Object *) (desc1->offset +
					     (char *)(XRECORD_LHEADER (obj)));
		  }
		* (EMACS_INT *) rdata = elt1->save_offset;
		break;
	      }
	    case XD_LISP_OBJECT:
	      {
		Lisp_Object *pobj = (Lisp_Object *) rdata;

		assert (desc1->data1 == 0);

		if (POINTER_TYPE_P (XTYPE (*pobj)) && XRECORD_LHEADER (*pobj))
		  * (EMACS_INT *) pobj =
		    pdump_get_entry (XRECORD_LHEADER (*pobj))->save_offset;
		break;
	      }
	    case XD_LISP_OBJECT_ARRAY:
	      {
		EMACS_INT num = lispdesc_indirect_count (desc1->data1, desc,
							 orig_data);
		int j;

		for (j = 0; j < num; j++)
		  {
		    Lisp_Object *pobj = ((Lisp_Object *) rdata) + j;
		    if (POINTER_TYPE_P (XTYPE (*pobj)) &&
			XRECORD_LHEADER (*pobj))
		      * (EMACS_INT *) pobj =
			pdump_get_entry (XRECORD_LHEADER (*pobj))->save_offset;
		  }
		break;
	      }
	    case XD_DOC_STRING:
	      {
		EMACS_INT str = *(EMACS_INT *)rdata;
		if (str > 0)
		  * (EMACS_INT *) rdata =
		    pdump_get_entry ((void *)str)->save_offset;
		break;
	      }
	    case XD_STRUCT_ARRAY:
	      {
		EMACS_INT num = lispdesc_indirect_count (desc1->data1, desc,
							 orig_data);
		const struct sized_memory_description *sdesc =
		  lispdesc_indirect_description (orig_data, desc1->data2);

		pdump_store_new_pointer_offsets
		  (num, rdata,
		   ((char *) rdata - (char *) data) + (char *) orig_data,
		   sdesc->description,
		   lispdesc_structure_size
		   (((char *) rdata - (char *) data) + (char *) orig_data,
		    sdesc));
		break;
	      }
	    case XD_UNION:
	    case XD_UNION_DYNAMIC_SIZE:
	      desc1 = lispdesc_process_xd_union (desc1, desc, orig_data);
	      if (desc1)
		goto union_switcheroo;
	      break;

	    default:
	      pdump_unsupported_dump_type (desc1->type, 0);
	    }
	}
    }
}

/* Write out to global file descriptor PDUMP_OUT the element (one or
   more contiguous blocks of identical size/description) recorded in
   ELT and described by DESC.  The element is first copied to a buffer
   and then all pointers (this includes Lisp_Objects other than
   integer/character) are relocated to the (pre-computed) offset in
   the dump file. */

static void
pdump_dump_data (pdump_entry_list_elt *elt,
		 const struct memory_description *desc)
{
  Bytecount size = elt->size;
  int count = elt->count;
  if (desc)
    {
      /* Copy to temporary buffer */
      memcpy (pdump_buf, elt->obj, size*count);

      /* Store new offsets into all pointers in block */
      pdump_store_new_pointer_offsets (count, pdump_buf, elt->obj, desc, size);
    }
  retry_fwrite (desc ? pdump_buf : elt->obj, size, count, pdump_out);
}

/* Relocate a single memory block at DATA, described by DESC, from its
   assumed load location to its actual one by adding DELTA to all pointers
   in the block.  Does not recursively relocate any other memory blocks
   pointed to. (We already have a list of all memory blocks in the dump
   file.)  This is used once the dump data has been loaded back in, both
   for blocks sitting in the dumped data and in global data objects whose
   contents have been restored from the dumped data. */

static void
pdump_reloc_one (void *data, EMACS_INT delta,
		 const struct memory_description *desc)
{
  int pos;

  for (pos = 0; desc[pos].type != XD_END; pos++)
    {
      const struct memory_description *desc1 = &desc[pos];
      void *rdata = (char *) data + lispdesc_indirect_count (desc1->offset,
							     desc, data);

    union_switcheroo:

      /* If the flag says don't dump, then don't dump. */
      if ((desc1->flags) & XD_FLAG_NO_PDUMP)
	continue;

      switch (desc1->type)
	{
	case XD_BYTECOUNT:
	case XD_ELEMCOUNT:
	case XD_HASHCODE:
	case XD_INT:
	case XD_LONG:
	case XD_INT_RESET:
	  break;
	case XD_OPAQUE_DATA_PTR:
	case XD_C_STRING:
	case XD_STRUCT_PTR:
	case XD_LO_LINK:
	  {
	    EMACS_INT ptr = *(EMACS_INT *)rdata;
	    if (ptr)
	      *(EMACS_INT *)rdata = ptr+delta;
	    break;
	  }
	case XD_LISP_OBJECT:
	  {
	    Lisp_Object *pobj = (Lisp_Object *) rdata;

	    assert (desc1->data1 == 0);

	    if (POINTER_TYPE_P (XTYPE (*pobj))
		&& ! EQ (*pobj, Qnull_pointer))
	      *pobj = wrap_pointer_1 ((char *) XPNTR (*pobj) + delta);

	    break;
	  }
	case XD_LISP_OBJECT_ARRAY:
	  {
	    EMACS_INT num = lispdesc_indirect_count (desc1->data1, desc,
						     data);
	    int j;

	    for (j=0; j<num; j++)
	      {
		Lisp_Object *pobj = (Lisp_Object *) rdata + j;

		if (POINTER_TYPE_P (XTYPE (*pobj))
		    && ! EQ (*pobj, Qnull_pointer))
		  *pobj = wrap_pointer_1 ((char *) XPNTR (*pobj) + delta);
	      }
	    break;
	  }
	case XD_DOC_STRING:
	  {
	    EMACS_INT str = *(EMACS_INT *)rdata;
	    if (str > 0)
	      *(EMACS_INT *)rdata = str + delta;
	    break;
	  }
	case XD_STRUCT_ARRAY:
	  {
	    EMACS_INT num = lispdesc_indirect_count (desc1->data1, desc,
						     data);
	    int j;
	    const struct sized_memory_description *sdesc =
	      lispdesc_indirect_description (data, desc1->data2);
	    Bytecount size = lispdesc_structure_size (rdata, sdesc);

	    /* Note: We are recursing over data in the block itself */
	    for (j = 0; j < num; j++)
	      pdump_reloc_one ((char *) rdata + j * size, delta,
			       sdesc->description);

	    break;
	  }
	case XD_UNION:
	case XD_UNION_DYNAMIC_SIZE:
	  desc1 = lispdesc_process_xd_union (desc1, desc, data);
	  if (desc1)
	    goto union_switcheroo;
	  break;

	default:
	  pdump_unsupported_dump_type (desc1->type, 0);
	}
    }
}

static void
pdump_allocate_offset (pdump_entry_list_elt *elt,
		       const struct memory_description *desc)
{
  Bytecount size = elt->count * elt->size;
  elt->save_offset = cur_offset;
  if (size>max_size)
    max_size = size;
  cur_offset += size;
}

static void
pdump_scan_by_alignment (void (*f)(pdump_entry_list_elt *,
				   const struct memory_description *))
{
  int align;

  for (align = ALIGNOF (max_align_t); align; align>>=1)
    {
      int i;
      pdump_entry_list_elt *elt;

      for (i=0; i<lrecord_type_count; i++)
	if (pdump_object_table[i].align == align)
	  for (elt = pdump_object_table[i].first; elt; elt = elt->next)
	    f (elt, lrecord_implementations_table[i]->description);

      for (i=0; i<pdump_struct_table.count; i++)
	{
	  pdump_struct_list_elt list = pdump_struct_table.list[i];
	  if (list.list.align == align)
	    for (elt = list.list.first; elt; elt = elt->next)
	      f (elt, list.desc);
	}

      for (elt = pdump_opaque_data_list.first; elt; elt = elt->next)
	if (pdump_size_to_align (elt->size) == align)
	  f (elt, 0);
    }
}

static void
pdump_dump_root_struct_ptrs (void)
{
  int i;
  Elemcount count = Dynarr_length (pdump_root_struct_ptrs);
  pdump_static_pointer *data = alloca_array (pdump_static_pointer, count);
  for (i = 0; i < count; i++)
    {
      data[i].address =
	(char **) Dynarr_atp (pdump_root_struct_ptrs, i)->ptraddress;
      data[i].value   =
	(char *) pdump_get_entry (* data[i].address)->save_offset;
    }
  PDUMP_ALIGN_OUTPUT (pdump_static_pointer);
  retry_fwrite (data, sizeof (pdump_static_pointer), count, pdump_out);
}

static void
pdump_dump_root_blocks (void)
{
  int i;
  for (i = 0; i < Dynarr_length (pdump_root_blocks); i++)
    {
      pdump_root_block *info = Dynarr_atp (pdump_root_blocks, i);
      PDUMP_WRITE_ALIGNED (pdump_root_block, *info);
      retry_fwrite (info->varaddress, info->size, 1, pdump_out);
    }
}

static void
pdump_dump_rtables (void)
{
  int i;
  pdump_entry_list_elt *elt;
  pdump_reloc_table rt;

  for (i=0; i<lrecord_type_count; i++)
    {
      elt = pdump_object_table[i].first;
      if (!elt)
	continue;
      rt.desc = lrecord_implementations_table[i]->description;
      rt.count = pdump_object_table[i].count;
      PDUMP_WRITE_ALIGNED (pdump_reloc_table, rt);
      while (elt)
	{
	  EMACS_INT rdata = pdump_get_entry (elt->obj)->save_offset;
	  PDUMP_WRITE_ALIGNED (EMACS_INT, rdata);
	  elt = elt->next;
	}
    }

  rt.desc = 0;
  rt.count = 0;
  PDUMP_WRITE_ALIGNED (pdump_reloc_table, rt);

  for (i=0; i<pdump_struct_table.count; i++)
    {
      elt = pdump_struct_table.list[i].list.first;
      rt.desc = pdump_struct_table.list[i].desc;
      rt.count = pdump_struct_table.list[i].list.count;
      PDUMP_WRITE_ALIGNED (pdump_reloc_table, rt);
      while (elt)
	{
	  EMACS_INT rdata = pdump_get_entry (elt->obj)->save_offset;
	  int j;
	  for (j=0; j<elt->count; j++)
	    {
	      PDUMP_WRITE_ALIGNED (EMACS_INT, rdata);
	      rdata += elt->size;
	    }
	  elt = elt->next;
	}
    }
  rt.desc = 0;
  rt.count = 0;
  PDUMP_WRITE_ALIGNED (pdump_reloc_table, rt);
}

static void
pdump_dump_root_lisp_objects (void)
{
  Elemcount count = (Dynarr_length (pdump_root_lisp_objects) +
			 Dynarr_length (pdump_weak_object_chains));
  Elemcount i;

  PDUMP_WRITE_ALIGNED (Elemcount, count);
  PDUMP_ALIGN_OUTPUT (pdump_static_Lisp_Object);

  for (i = 0; i < Dynarr_length (pdump_root_lisp_objects); i++)
    {
      pdump_static_Lisp_Object obj;
      obj.address = Dynarr_at (pdump_root_lisp_objects, i);
      obj.value   = * obj.address;

      if (POINTER_TYPE_P (XTYPE (obj.value)))
	obj.value =
	  wrap_pointer_1 ((void *) pdump_get_entry (XRECORD_LHEADER
						    (obj.value))->save_offset);

      PDUMP_WRITE (pdump_static_Lisp_Object, obj);
    }

  for (i=0; i<Dynarr_length (pdump_weak_object_chains); i++)
    {
      pdump_entry_list_elt *elt;
      pdump_static_Lisp_Object obj;

      obj.address = Dynarr_at (pdump_weak_object_chains, i);
      obj.value   = * obj.address;

      for (;;)
	{
	  const struct memory_description *desc;
	  int pos;
	  elt = pdump_get_entry (XRECORD_LHEADER (obj.value));
	  if (elt)
	    break;
	  desc = XRECORD_LHEADER_IMPLEMENTATION (obj.value)->description;
	  for (pos = 0; desc[pos].type != XD_LO_LINK; pos++)
	    assert (desc[pos].type != XD_END);

	  /* #### Figure out how to handle indirect offsets here. */
	  assert (!XD_IS_INDIRECT (desc[pos].offset));
	  obj.value =
	    * (Lisp_Object *) (desc[pos].offset +
			       (char *) (XRECORD_LHEADER (obj.value)));
	}
      obj.value = wrap_pointer_1 ((void *) elt->save_offset);

      PDUMP_WRITE (pdump_static_Lisp_Object, obj);
    }
}

void
pdump (void)
{
  int i;
  Lisp_Object t_console, t_device, t_frame;
  int none;
  pdump_header header;

  in_pdump = 1;

  pdump_object_table = xnew_array (pdump_entry_list, lrecord_type_count);
  pdump_alert_undump_object = xnew_array (int, lrecord_type_count);

  assert (ALIGNOF (max_align_t) <= pdump_align_table[0]);

  for (i = 0; i < countof (pdump_align_table); i++)
    if (pdump_align_table[i] > ALIGNOF (max_align_t))
      pdump_align_table[i] = ALIGNOF (max_align_t);

  flush_all_buffer_local_cache ();

  /* These appear in a DEFVAR_LISP, which does a staticpro() */
  t_console = Vterminal_console; Vterminal_console = Qnil;
  t_frame   = Vterminal_frame;   Vterminal_frame   = Qnil;
  t_device  = Vterminal_device;  Vterminal_device  = Qnil;

  dump_add_opaque (&lrecord_implementations_table,
		   lrecord_type_count *
		   sizeof (lrecord_implementations_table[0]));
#ifdef USE_KKCC  
  dump_add_opaque (&lrecord_memory_descriptions,
		   lrecord_type_count 
		   * sizeof (lrecord_memory_descriptions[0]));
#else /* not USE_KKCC */
  dump_add_opaque (&lrecord_markers,
		   lrecord_type_count * sizeof (lrecord_markers[0]));
#endif /* not USE_KKCC */

  pdump_hash = xnew_array_and_zero (pdump_entry_list_elt *, PDUMP_HASHSIZE);

  for (i=0; i<lrecord_type_count; i++)
    {
      pdump_object_table[i].first = 0;
      pdump_object_table[i].align = ALIGNOF (max_align_t);
      pdump_object_table[i].count = 0;
      pdump_alert_undump_object[i] = 0;
    }
  pdump_struct_table.count = 0;
  pdump_struct_table.size = -1;

  pdump_opaque_data_list.first = 0;
  pdump_opaque_data_list.align = ALIGNOF (max_align_t);
  pdump_opaque_data_list.count = 0;
  pdump_depth = 0;

  for (i = 0; i < Dynarr_length (pdump_root_lisp_objects); i++)
    pdump_register_object (* Dynarr_at (pdump_root_lisp_objects, i));

  none = 1;
  for (i=0; i<lrecord_type_count; i++)
    if (pdump_alert_undump_object[i])
      {
	if (none)
	  printf ("Undumpable types list :\n");
	none = 0;
	printf ("  - %s (%d)\n", lrecord_implementations_table[i]->name,
		pdump_alert_undump_object[i]);
      }
  if (!none)
    {
      in_pdump = 0;
      return;
    }

  for (i=0; i<Dynarr_length (pdump_root_struct_ptrs); i++)
    {
      pdump_root_struct_ptr info = Dynarr_at (pdump_root_struct_ptrs, i);
      pdump_register_struct (*(info.ptraddress), info.desc, 1);
    }

  memcpy (header.signature, PDUMP_SIGNATURE, PDUMP_SIGNATURE_LEN);
  header.id = dump_id;
  header.reloc_address = 0;
  header.nb_root_struct_ptrs = Dynarr_length (pdump_root_struct_ptrs);
  header.nb_root_blocks = Dynarr_length (pdump_root_blocks);

  cur_offset = MAX_ALIGN_SIZE (sizeof (header));
  max_size = 0;

  pdump_scan_by_alignment (pdump_allocate_offset);
  cur_offset = MAX_ALIGN_SIZE (cur_offset);
  header.stab_offset = cur_offset;

  pdump_buf = xmalloc (max_size);
  pdump_fd = open (EMACS_PROGNAME ".dmp",
		   O_WRONLY | O_CREAT | O_TRUNC | OPEN_BINARY, 0666);
  if (pdump_fd < 0)
    report_file_error ("Unable to open dump file",
		       build_string (EMACS_PROGNAME ".dmp"));
  pdump_out = fdopen (pdump_fd, "w");
  if (pdump_out < 0)
    report_file_error ("Unable to open dump file for writing",
		       build_string (EMACS_PROGNAME ".dmp"));

  retry_fwrite (&header, sizeof (header), 1, pdump_out);
  PDUMP_ALIGN_OUTPUT (max_align_t);

  pdump_scan_by_alignment (pdump_dump_data);

  fseek (pdump_out, header.stab_offset, SEEK_SET);

  pdump_dump_root_struct_ptrs ();
  pdump_dump_root_blocks ();
  pdump_dump_rtables ();
  pdump_dump_root_lisp_objects ();

  retry_fclose (pdump_out);
  retry_close (pdump_fd);

  free (pdump_buf);

  free (pdump_hash);

  Vterminal_console = t_console;
  Vterminal_frame   = t_frame;
  Vterminal_device  = t_device;
  in_pdump = 0;
}

static int
pdump_load_check (void)
{
  return (!memcmp (((pdump_header *)pdump_start)->signature,
		   PDUMP_SIGNATURE, PDUMP_SIGNATURE_LEN)
	  && ((pdump_header *)pdump_start)->id == dump_id);
}

/*----------------------------------------------------------------------*/
/*			Reading the dump file				*/
/*----------------------------------------------------------------------*/
static int
pdump_load_finish (void)
{
  int i;
  char *p;
  EMACS_INT delta;
  EMACS_INT count;
  pdump_header *header = (pdump_header *) pdump_start;

  pdump_end = pdump_start + pdump_length;

  delta = ((EMACS_INT) pdump_start) - header->reloc_address;
  p = pdump_start + header->stab_offset;

  /* Put back the pdump_root_struct_ptrs */
  p = (char *) ALIGN_PTR (p, pdump_static_pointer);
  for (i = 0; i < header->nb_root_struct_ptrs; i++)
    {
      pdump_static_pointer ptr = PDUMP_READ (p, pdump_static_pointer);
      (* ptr.address) = ptr.value + delta;
    }

  /* Put back the pdump_root_blocks and relocate */
  for (i = 0; i < header->nb_root_blocks; i++)
    {
      pdump_root_block info = PDUMP_READ_ALIGNED (p, pdump_root_block);
      memcpy ((void *) info.varaddress, p, info.size);
      if (info.desc)
	pdump_reloc_one ((void *) info.varaddress, delta, info.desc);
      p += info.size;
    }

  /* Relocate the heap objects */
  pdump_rt_list = p;
  count = 2;
  for (;;)
    {
      pdump_reloc_table rt = PDUMP_READ_ALIGNED (p, pdump_reloc_table);
      p = (char *) ALIGN_PTR (p, char *);
      if (rt.desc)
	{
	  char **reloc = (char **) p;
	  for (i = 0; i < rt.count; i++)
	    {
	      reloc[i] += delta;
	      pdump_reloc_one (reloc[i], delta, rt.desc);
	    }
	  p += rt.count * sizeof (char *);
	}
      else if (!(--count))
	  break;
    }

  /* Put the pdump_root_lisp_objects variables in place */
  i = PDUMP_READ_ALIGNED (p, Elemcount);
  p = (char *) ALIGN_PTR (p, pdump_static_Lisp_Object);
  while (i--)
    {
      pdump_static_Lisp_Object obj = PDUMP_READ (p, pdump_static_Lisp_Object);

      if (POINTER_TYPE_P (XTYPE (obj.value)))
	obj.value = wrap_pointer_1 ((char *) XPNTR (obj.value) + delta);

      (* obj.address) = obj.value;
    }

  /* Final cleanups */
  /*   reorganize hash tables */
  p = pdump_rt_list;
  for (;;)
    {
      pdump_reloc_table rt = PDUMP_READ_ALIGNED (p, pdump_reloc_table);
      p = (char *) ALIGN_PTR (p, Lisp_Object);
      if (!rt.desc)
	break;
      if (rt.desc == hash_table_description)
	{
	  for (i = 0; i < rt.count; i++)
	    pdump_reorganize_hash_table (PDUMP_READ (p, Lisp_Object));
	  break;
	}
      else
	p += sizeof (Lisp_Object) * rt.count;
    }

  return 1;
}

#ifdef WIN32_NATIVE
/* Free the mapped file if we decide we don't want it after all */
static void
pdump_file_unmap (void)
{
  UnmapViewOfFile (pdump_start);
  CloseHandle (pdump_hFile);
  CloseHandle (pdump_hMap);
}

static int
pdump_file_get (const char *path)
{

  pdump_hFile = CreateFileA (path,
		            GENERIC_READ + GENERIC_WRITE,  /* Required for copy on write */
			    0,		            /* Not shared */
			    NULL,		    /* Not inheritable */
			    OPEN_EXISTING,
			    FILE_ATTRIBUTE_NORMAL,
			    NULL);		    /* No template file */
  if (pdump_hFile == INVALID_HANDLE_VALUE)
    return 0;

  pdump_length = GetFileSize (pdump_hFile, NULL);
  pdump_hMap = CreateFileMappingA (pdump_hFile,
				  NULL,		    /* No security attributes */
				  PAGE_WRITECOPY,   /* Copy on write */
				  0,		    /* Max size, high half */
				  0,		    /* Max size, low half */
				  NULL);	    /* Unnamed */
  if (pdump_hMap == INVALID_HANDLE_VALUE)
    return 0;

  pdump_start = (char *) MapViewOfFile (pdump_hMap,
					FILE_MAP_COPY, /* Copy on write */
					0,	      /* Start at zero */
					0,
					0);	      /* Map all of it */
  pdump_free = pdump_file_unmap;
  return 1;
}

/* pdump_resource_free is called (via the pdump_free pointer) to release
   any resources allocated by pdump_resource_get.  Since the Windows API
   specs specifically state that you don't need to (and shouldn't) free the
   resources allocated by FindResource, LoadResource, and LockResource this
   routine does nothing.  */
static void
pdump_resource_free (void)
{
}

static int
pdump_resource_get (void)
{
  HRSRC hRes;			/* Handle to dump resource */
  HRSRC hResLoad;		/* Handle to loaded dump resource */

  /* See Q126630 which describes how Windows NT and 95 trap writes to
     resource sections and duplicate the page to allow the write to proceed.
     It also describes how to make the resource section read/write (and hence
     private to each process).  Doing this avoids the exceptions and related
     overhead, but causes the resource section to be private to each process
     that is running XEmacs.  Since the resource section contains little
     other than the dumped data, which should be private to each process, we
     make the whole resource section read/write so we don't have to copy it. */

  hRes = FindResourceA (NULL, MAKEINTRESOURCE (101), "DUMP");
  if (hRes == NULL)
    return 0;

  /* Found it, use the data in the resource */
  hResLoad = (HRSRC) LoadResource (NULL, hRes);
  if (hResLoad == NULL)
    return 0;

  pdump_start = (char *) LockResource (hResLoad);
  if (pdump_start == NULL)
    return 0;

  pdump_free = pdump_resource_free;
  pdump_length = SizeofResource (NULL, hRes);
  if (pdump_length <= (Bytecount) sizeof (pdump_header))
    {
      pdump_start = 0;
      return 0;
    }

  return 1;
}

#else /* !WIN32_NATIVE */

static void
pdump_file_free (void)
{
  xfree (pdump_start, char *);
}

#ifdef HAVE_MMAP
static void
pdump_file_unmap (void)
{
  munmap (pdump_start, pdump_length);
}
#endif

static int
pdump_file_get (const char *path)
{
  int fd = open (path, O_RDONLY | OPEN_BINARY);
  if (fd<0)
    return 0;

  pdump_length = lseek (fd, 0, SEEK_END);
  if (pdump_length < (Bytecount) sizeof (pdump_header))
    {
      retry_close (fd);
      return 0;
    }

  lseek (fd, 0, SEEK_SET);

#ifdef HAVE_MMAP
/* Unix 98 requires that sys/mman.h define MAP_FAILED,
   but many earlier implementations don't. */
# ifndef MAP_FAILED
#  define MAP_FAILED ((void *) -1L)
# endif
  pdump_start = (char *) mmap (0, pdump_length, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
  if (pdump_start != (char *) MAP_FAILED)
    {
      pdump_free = pdump_file_unmap;
      retry_close (fd);
      return 1;
    }
#endif /* HAVE_MMAP */

  pdump_start = xnew_array (char, pdump_length);
  pdump_free = pdump_file_free;
  retry_read (fd, pdump_start, pdump_length);

  retry_close (fd);
  return 1;
}

static int
pdump_ram_try (void)
{
  pdump_start = dumped_data_get();
  pdump_length = dumped_data_size();

  return pdump_load_check();
}

#endif /* !WIN32_NATIVE */


static int
pdump_file_try (char *exe_path)
{
  char *w = exe_path + strlen (exe_path);

  do
    {
      sprintf (w, "-%s-%08x.dmp", EMACS_VERSION, dump_id);
      if (pdump_file_get (exe_path))
	{
	  if (pdump_load_check ())
	    return 1;
	  pdump_free ();
	}

      sprintf (w, "-%08x.dmp", dump_id);
      if (pdump_file_get (exe_path))
	{
	  if (pdump_load_check ())
	    return 1;
	  pdump_free ();
	}

      sprintf (w, ".dmp");
      if (pdump_file_get (exe_path))
	{
	  if (pdump_load_check ())
	    return 1;
	  pdump_free ();
	}

      do
	w--;
      while (w>exe_path && !IS_DIRECTORY_SEP (*w) && (*w != '-') && (*w != '.'));
    }
  while (w>exe_path && !IS_DIRECTORY_SEP (*w));
  return 0;
}

int
pdump_load (const Extbyte *argv0)
{
  Extbyte exe_path[PATH_MAX];

#ifdef WIN32_NATIVE
  GetModuleFileNameA (NULL, exe_path, PATH_MAX);
#else /* !WIN32_NATIVE */
  Extbyte *w;
  const Extbyte *dir, *p;

  if(pdump_ram_try()) {
    pdump_load_finish();
    in_pdump = 0;
    return 1;
  }

  in_pdump = 1;
  dir = argv0;
  if (dir[0] == '-')
    {
      /* XEmacs as a login shell, oh goody! */
      dir = getenv ("SHELL"); /* not egetenv -- not yet initialized */
    }

  p = dir + strlen (dir);
  while (p != dir && !IS_ANY_SEP (p[-1])) p--;

  if (p != dir)
    {
      /* invocation-name includes a directory component -- presumably it
	 is relative to cwd, not $PATH */
      strcpy (exe_path, dir);
    }
  else
    {
      const Extbyte *path = getenv ("PATH"); /* not egetenv -- not yet init. */
      const Extbyte *name = p;
      for (;;)
	{
	  p = path;
	  while (*p && *p != SEPCHAR)
	    p++;
	  if (p == path)
	    {
	      exe_path[0] = '.';
	      w = exe_path + 1;
	    }
	  else
	    {
	      memcpy (exe_path, path, p - path);
	      w = exe_path + (p - path);
	    }
	  if (!IS_DIRECTORY_SEP (w[-1]))
	    {
	      *w++ = '/';
	    }
	  strcpy (w, name);

#undef access /* avoid !@#$%^& encapsulated access */
#undef stat   /* avoid !@#$%^& encapsulated stat */

	  {
	    struct stat statbuf;
	    if (access (exe_path, X_OK) == 0
		&& stat (exe_path, &statbuf) == 0
		&& ! S_ISDIR (statbuf.st_mode))
	      break;
	  }

	  if (!*p)
	    {
	      /* Oh well, let's have some kind of default */
	      sprintf (exe_path, "./%s", name);
	      break;
	    }
	  path = p+1;
	}
    }
#endif /* WIN32_NATIVE */

  if (pdump_file_try (exe_path))
    {
      pdump_load_finish ();
      in_pdump = 0;
      return 1;
    }

#ifdef WIN32_NATIVE
  if (pdump_resource_get ())
    {
      if (pdump_load_check ())
	{
	  pdump_load_finish ();
	  in_pdump = 0;
	  return 1;
	}
      pdump_free ();
    }
#endif

  in_pdump = 0;
  return 0;
}