--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/alloc.c	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,4608 @@
+/* Storage allocation and gc for XEmacs Lisp interpreter.
+   Copyright (C) 1985, 1986, 1988, 1992, 1993, 1994
+   Free Software Foundation, Inc.
+   Copyright (C) 1995 Sun Microsystems, Inc.
+   Copyright (C) 1995, 1996 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: FSF 19.28, Mule 2.0.  Substantially different from
+   FSF. */
+
+/* Authorship:
+
+   FSF: Original version; a long time ago.
+   Mly: Significantly rewritten to use new 3-bit tags and
+        nicely abstracted object definitions, for 19.8.
+   JWZ: Improved code to keep track of purespace usage and
+        issue nice purespace and GC stats.
+   Ben Wing: Cleaned up frob-block lrecord code, added error-checking
+        and various changes for Mule, for 19.12.
+        Added bit vectors for 19.13.
+	Added lcrecord lists for 19.14.
+*/
+
+#include <config.h>
+#include "lisp.h"
+
+#ifndef standalone
+#include "backtrace.h"
+#include "buffer.h"
+#include "bytecode.h"
+#include "device.h"
+#include "elhash.h"
+#include "events.h"
+#include "extents.h"
+#include "frame.h"
+#include "glyphs.h"
+#include "redisplay.h"
+#include "specifier.h"
+#include "window.h"
+#endif
+
+/* #define GDB_SUCKS */
+
+/* #define VERIFY_STRING_CHARS_INTEGRITY */
+
+/* Define this to see where all that space is going... */
+#define PURESTAT
+
+/* Define this to use malloc/free with no freelist for all datatypes,
+   the hope being that some debugging tools may help detect
+   freed memory references */
+/* #define ALLOC_NO_POOLS */
+
+#include "puresize.h"
+
+#ifdef DEBUG_XEMACS
+int debug_allocation;
+
+int debug_allocation_backtrace_length;
+#endif
+
+/* Number of bytes of consing done since the last gc */
+EMACS_INT consing_since_gc;
+#ifdef EMACS_BTL
+extern void cadillac_record_backtrace ();
+#define INCREMENT_CONS_COUNTER_1(size)		\
+  do {						\
+    EMACS_INT __sz__ = ((EMACS_INT) (size));	\
+    consing_since_gc += __sz__;			\
+    cadillac_record_backtrace (2, __sz__);	\
+  } while (0)
+#else
+#define INCREMENT_CONS_COUNTER_1(size) (consing_since_gc += (size))
+#endif
+
+#define debug_allocation_backtrace()				\
+do {								\
+  if (debug_allocation_backtrace_length > 0)			\
+    debug_short_backtrace (debug_allocation_backtrace_length);	\
+} while (0)
+
+#ifdef DEBUG_XEMACS
+#define INCREMENT_CONS_COUNTER(foosize, type)			\
+  do {								\
+    if (debug_allocation)					\
+      {								\
+	stderr_out ("allocating %s (size %ld)\n", type, (long)foosize);	\
+	debug_allocation_backtrace ();				\
+      }								\
+    INCREMENT_CONS_COUNTER_1 (foosize);				\
+  } while (0)
+#define NOSEEUM_INCREMENT_CONS_COUNTER(foosize, type)		\
+  do {								\
+    if (debug_allocation > 1)					\
+      {								\
+	stderr_out ("allocating noseeum %s (size %ld)\n", type, (long)foosize); \
+	debug_allocation_backtrace ();				\
+      }								\
+    INCREMENT_CONS_COUNTER_1 (foosize);				\
+  } while (0)
+#else
+#define INCREMENT_CONS_COUNTER(size, type) INCREMENT_CONS_COUNTER_1 (size)
+#define NOSEEUM_INCREMENT_CONS_COUNTER(size, type) \
+  INCREMENT_CONS_COUNTER_1 (size)
+#endif
+
+#define DECREMENT_CONS_COUNTER(size)		\
+  do {						\
+    EMACS_INT __sz__ = ((EMACS_INT) (size));	\
+    if (consing_since_gc >= __sz__)		\
+      consing_since_gc -= __sz__;		\
+    else					\
+      consing_since_gc = 0;			\
+  } while (0)
+
+/* Number of bytes of consing since gc before another gc should be done. */
+EMACS_INT gc_cons_threshold;
+
+/* Nonzero during gc */
+int gc_in_progress;
+
+/* Number of times GC has happened at this level or below.
+ * Level 0 is most volatile, contrary to usual convention.
+ *  (Of course, there's only one level at present) */
+EMACS_INT gc_generation_number[1];
+
+/* This is just for use by the printer, to allow things to print uniquely */
+static int lrecord_uid_counter;
+
+/* Nonzero when calling certain hooks or doing other things where
+   a GC would be bad */
+int gc_currently_forbidden;
+
+/* Hooks. */
+Lisp_Object Vpre_gc_hook, Qpre_gc_hook;
+Lisp_Object Vpost_gc_hook, Qpost_gc_hook;
+
+/* "Garbage collecting" */
+Lisp_Object Vgc_message;
+Lisp_Object Vgc_pointer_glyph;
+static CONST char gc_default_message[] = "Garbage collecting";
+Lisp_Object Qgarbage_collecting;
+
+#ifndef VIRT_ADDR_VARIES
+extern
+#endif /* VIRT_ADDR_VARIES */
+ EMACS_INT malloc_sbrk_used;
+
+#ifndef VIRT_ADDR_VARIES
+extern
+#endif /* VIRT_ADDR_VARIES */
+ EMACS_INT malloc_sbrk_unused;
+
+/* Non-zero means defun should do purecopy on the function definition */
+int purify_flag;
+
+extern Lisp_Object pure[];/* moved to pure.c to speed incremental linking */
+
+#define PUREBEG ((unsigned char *) pure)
+
+/* Index in pure at which next pure object will be allocated. */
+static long pureptr;
+
+#define PURIFIED(ptr)							\
+   ((PNTR_COMPARISON_TYPE) (ptr) <					\
+    (PNTR_COMPARISON_TYPE) (PUREBEG + PURESIZE) &&			\
+    (PNTR_COMPARISON_TYPE) (ptr) >=					\
+    (PNTR_COMPARISON_TYPE) PUREBEG)
+
+/* Non-zero if pureptr > PURESIZE; accounts for excess purespace needs. */
+static long pure_lossage;
+
+#ifdef ERROR_CHECK_TYPECHECK
+
+Error_behavior ERROR_ME, ERROR_ME_NOT, ERROR_ME_WARN;
+
+#endif
+
+int
+purified (Lisp_Object obj)
+{
+  if (!POINTER_TYPE_P (XGCTYPE (obj)))
+    return (0);
+  return (PURIFIED (XPNTR (obj)));
+}
+
+int
+purespace_usage (void)
+{
+  return (int) pureptr;
+}
+
+static int
+check_purespace (EMACS_INT size)
+{
+  if (pure_lossage)
+    {
+      pure_lossage += size;
+      return (0);
+    }
+  else if (pureptr + size > PURESIZE)
+    {
+      message ("\nERROR:  Pure Lisp storage exhausted!\n");
+      pure_lossage = size;
+      return (0);
+    }
+  else
+    return (1);
+}
+
+
+
+#ifndef PURESTAT
+
+#define bump_purestat(p,b) do {} while (0) /* Do nothing */
+
+#else /* PURESTAT */
+
+static int purecopying_for_bytecode;
+
+static int pure_sizeof (Lisp_Object /*, int recurse */);
+
+/* Keep statistics on how much of what is in purespace */
+struct purestat
+{
+  int nobjects;
+  int nbytes;
+  CONST char *name;
+};
+
+#define FMH(s,n) static struct purestat s = { 0, 0, n }
+FMH (purestat_cons, "cons cells:");
+FMH (purestat_float, "float objects:");
+FMH (purestat_string_pname, "symbol-name strings:");
+FMH (purestat_bytecode, "compiled-function objects:");
+FMH (purestat_string_bytecodes, "byte-code strings:");
+FMH (purestat_vector_bytecode_constants, "byte-constant vectors:");
+FMH (purestat_string_interactive, "interactive strings:");
+#ifdef I18N3
+FMH (purestat_string_domain, "domain strings:");
+#endif
+FMH (purestat_string_documentation, "documentation strings:");
+FMH (purestat_string_other_function, "other function strings:");
+FMH (purestat_vector_other, "other vectors:");
+FMH (purestat_string_other, "other strings:");
+FMH (purestat_string_all, "all strings:");
+FMH (purestat_vector_all, "all vectors:");
+
+static struct purestat *purestats[] =
+{
+  &purestat_cons,
+  &purestat_float,
+  &purestat_string_pname,
+  &purestat_bytecode,
+  &purestat_string_bytecodes,
+  &purestat_vector_bytecode_constants,
+  &purestat_string_interactive,
+#ifdef I18N3
+  &purestat_string_domain,
+#endif
+  &purestat_string_documentation,
+  &purestat_string_other_function,
+  &purestat_vector_other,
+  &purestat_string_other,
+  0,
+  &purestat_string_all,
+  &purestat_vector_all
+};
+#undef FMH
+
+static void
+bump_purestat (struct purestat *purestat, int nbytes)
+{
+  if (pure_lossage) return;
+  purestat->nobjects += 1;
+  purestat->nbytes += nbytes;
+}
+#endif /* PURESTAT */
+
+
+/* Maximum amount of C stack to save when a GC happens.  */
+
+#ifndef MAX_SAVE_STACK
+#define MAX_SAVE_STACK 16000
+#endif
+
+/* Buffer in which we save a copy of the C stack at each GC.  */
+
+static char *stack_copy;
+static int stack_copy_size;
+
+/* Non-zero means ignore malloc warnings.  Set during initialization.  */
+int ignore_malloc_warnings;
+
+
+static void *breathing_space;
+
+void
+release_breathing_space (void)
+{
+  if (breathing_space) 
+    {
+      void *tmp = breathing_space;
+      breathing_space = 0;
+      xfree (tmp);
+    }
+}
+
+/* malloc calls this if it finds we are near exhausting storage */
+void
+malloc_warning (CONST char *str)
+{
+  if (ignore_malloc_warnings)
+    return;
+
+  warn_when_safe
+    (Qmemory, Qcritical,
+     "%s\n"
+     "Killing some buffers may delay running out of memory.\n"
+     "However, certainly by the time you receive the 95%% warning,\n"
+     "you should clean up, kill this Emacs, and start a new one.",
+     str);
+}
+
+/* Called if malloc returns zero */
+DOESNT_RETURN
+memory_full (void)
+{
+  /* Force a GC next time eval is called.
+     It's better to loop garbage-collecting (we might reclaim enough
+     to win) than to loop beeping and barfing "Memory exhausted"
+   */
+  consing_since_gc = gc_cons_threshold + 1;
+  release_breathing_space ();
+
+#ifndef standalone
+  /* Flush some histories which might conceivably contain
+   *  garbalogical inhibitors */
+  if (!NILP (Fboundp (Qvalues)))
+    Fset (Qvalues, Qnil);
+  Vcommand_history = Qnil;
+#endif
+
+  error ("Memory exhausted");
+}
+
+/* like malloc and realloc but check for no memory left, and block input. */
+
+void *
+xmalloc (int size)
+{
+  void *val;
+
+  val = (void *) malloc (size);
+
+  if (!val && (size != 0)) memory_full ();
+  return val;
+}
+
+void *
+xmalloc_and_zero (int size)
+{
+  void *val = xmalloc (size);
+  memset (val, 0, size);
+  return val;
+}
+
+void *
+xrealloc (void *block, int size)
+{
+  void *val;
+
+  /* We must call malloc explicitly when BLOCK is 0, since some
+     reallocs don't do this.  */
+  if (! block)
+    val = (void *) malloc (size);
+  else
+    val = (void *) realloc (block, size);
+
+  if (!val && (size != 0)) memory_full ();
+  return val;
+}
+
+void
+#ifdef ERROR_CHECK_MALLOC
+xfree_1 (void *block)
+#else
+xfree (void *block)
+#endif
+{
+#ifdef ERROR_CHECK_MALLOC
+  /* Unbelievably, calling free() on 0xDEADBEEF doesn't cause an
+     error until much later on for many system mallocs, such as
+     the one that comes with Solaris 2.3.  FMH!! */
+  assert (block != (void *) 0xDEADBEEF);
+  assert (block);
+#endif
+  free (block);
+}
+
+#if INTBITS == 32
+# define FOUR_BYTE_TYPE unsigned int
+#elif LONGBITS == 32
+# define FOUR_BYTE_TYPE unsigned long
+#elif SHORTBITS == 32
+# define FOUR_BYTE_TYPE unsigned short
+#else
+What kind of strange-ass system are we running on?
+#endif
+
+#ifdef ERROR_CHECK_GC
+
+#ifdef WORDS_BIGENDIAN
+static unsigned char deadbeef_as_char[] = {0xDE, 0xAD, 0xBE, 0xEF};
+#else
+static unsigned char deadbeef_as_char[] = {0xEF, 0xBE, 0xAD, 0xDE};
+#endif
+
+static void
+deadbeef_memory (void *ptr, unsigned long size)
+{
+  unsigned long long_length = size / sizeof (FOUR_BYTE_TYPE);
+  unsigned long i;
+  unsigned long bytes_left_over = size - sizeof (FOUR_BYTE_TYPE) * long_length;
+  
+  for (i = 0; i < long_length; i++)
+    ((FOUR_BYTE_TYPE *) ptr)[i] = 0xdeadbeef;
+  for (i = i; i < bytes_left_over; i++)
+    ((unsigned char *) ptr + long_length)[i] = deadbeef_as_char[i];
+}
+
+#else
+
+#define deadbeef_memory(ptr, size)
+
+#endif
+
+char *
+xstrdup (CONST char *str)
+{
+  char *val;
+  int len = strlen (str) + 1;   /* for stupid terminating 0 */
+
+  val = xmalloc (len);
+  if (val == 0) return 0;
+  memcpy (val, str, len);
+  return (val);
+}
+
+#ifdef NEED_STRDUP
+char *
+strdup (CONST char *s)
+{
+  return xstrdup (s);
+}
+#endif /* NEED_STRDUP */
+
+
+static void *
+allocate_lisp_storage (int size)
+{
+  void *p = xmalloc (size);
+  char *lim = ((char *) p) + size;
+  Lisp_Object val = Qnil;
+
+  XSETCONS (val, lim);
+  if ((char *) XCONS (val) != lim)
+    {
+      xfree (p);
+      memory_full ();
+    }
+  return (p);
+}
+
+
+#define MARKED_RECORD_HEADER_P(lheader) \
+  (((lheader)->implementation->finalizer) == this_marks_a_marked_record)
+#define UNMARKABLE_RECORD_HEADER_P(lheader) \
+  (((lheader)->implementation->marker) == this_one_is_unmarkable)
+#define MARK_RECORD_HEADER(lheader) \
+  do { (((lheader)->implementation)++); } while (0)
+#define UNMARK_RECORD_HEADER(lheader) \
+  do { (((lheader)->implementation)--); } while (0)
+
+
+/* lrecords are chained together through their "next.v" field.
+ * After doing the mark phase, the GC will walk this linked
+ *  list and free any record which hasn't been marked 
+ */
+static struct lcrecord_header *all_lcrecords;
+
+void *
+alloc_lcrecord (int size, CONST struct lrecord_implementation *implementation)
+{
+  struct lcrecord_header *lcheader;
+
+  if (size <= 0) abort ();
+  if (implementation->static_size == 0)
+    {
+      if (!implementation->size_in_bytes_method)
+	abort ();
+    }
+  else if (implementation->static_size != size)
+    abort ();
+
+  lcheader = allocate_lisp_storage (size);
+  lcheader->lheader.implementation = implementation;
+  lcheader->next = all_lcrecords;
+#if 1                           /* mly prefers to see small ID numbers */
+  lcheader->uid = lrecord_uid_counter++;
+#else				/* jwz prefers to see real addrs */
+  lcheader->uid = (int) &lcheader;
+#endif
+  lcheader->free = 0;
+  all_lcrecords = lcheader;
+  INCREMENT_CONS_COUNTER (size, implementation->name);
+  return (lcheader);
+}
+
+#if 0 /* Presently unused */
+/* Very, very poor man's EGC?
+ * This may be slow and thrash pages all over the place.
+ *  Only call it if you really feel you must (and if the
+ *  lrecord was fairly recently allocated).
+ * Otherwise, just let the GC do its job -- that's what it's there for
+ */
+void
+free_lcrecord (struct lcrecord_header *lcrecord)
+{
+  if (all_lcrecords == lcrecord)
+    {
+      all_lcrecords = lcrecord->next;
+    }
+  else
+    {
+      struct lrecord_header *header = all_lcrecords;
+      for (;;)
+	{
+	  struct lrecord_header *next = header->next;
+	  if (next == lcrecord)
+	    {
+	      header->next = lrecord->next;
+	      break;
+	    }
+	  else if (next == 0)
+	    abort ();
+	  else
+	    header = next;
+	}
+    }
+  if (lrecord->implementation->finalizer)
+    ((lrecord->implementation->finalizer) (lrecord, 0));
+  xfree (lrecord);
+  return;
+}
+#endif /* Unused */
+
+
+static void
+disksave_object_finalization_1 (void)
+{
+  struct lcrecord_header *header;
+
+  for (header = all_lcrecords; header; header = header->next)
+    {
+      if (header->lheader.implementation->finalizer && !header->free)
+	((header->lheader.implementation->finalizer) (header, 1));
+    }
+}
+  
+
+/* This must not be called -- it just serves as for EQ test
+ *  If lheader->implementation->finalizer is this_marks_a_marked_record,
+ *  then lrecord has been marked by the GC sweeper
+ * header->implementation is put back to its correct value by
+ *  sweep_records */
+void
+this_marks_a_marked_record (void *dummy0, int dummy1)
+{
+  abort ();
+}
+
+/* Semi-kludge -- lrecord_symbol_value_forward objects get stuck
+   in CONST space and you get SEGV's if you attempt to mark them.
+   This sits in lheader->implementation->marker. */
+
+Lisp_Object
+this_one_is_unmarkable (Lisp_Object obj, void (*markobj) (Lisp_Object))
+{
+  abort ();
+  return Qnil;
+}
+
+/* XGCTYPE for records */
+int
+gc_record_type_p (Lisp_Object frob, CONST struct lrecord_implementation *type)
+{
+  return (XGCTYPE (frob) == Lisp_Record
+          && (XRECORD_LHEADER (frob)->implementation == type
+              || XRECORD_LHEADER (frob)->implementation == type + 1));
+}
+
+
+/**********************************************************************/
+/*                        Fixed-size type macros                      */
+/**********************************************************************/
+
+/* For fixed-size types that are commonly used, we malloc() large blocks
+   of memory at a time and subdivide them into chunks of the correct
+   size for an object of that type.  This is more efficient than
+   malloc()ing each object separately because we save on malloc() time
+   and overhead due to the fewer number of malloc()ed blocks, and
+   also because we don't need any extra pointers within each object
+   to keep them threaded together for GC purposes.  For less common
+   (and frequently large-size) types, we use lcrecords, which are
+   malloc()ed individually and chained together through a pointer
+   in the lcrecord header.  lcrecords do not need to be fixed-size
+   (i.e. two objects of the same type need not have the same size;
+   however, the size of a particular object cannot vary dynamically).
+   It is also much easier to create a new lcrecord type because no
+   additional code needs to be added to alloc.c.  Finally, lcrecords
+   may be more efficient when there are only a small number of them.
+
+   The types that are stored in these large blocks (or "frob blocks")
+   are cons, float, compiled-function, symbol, marker, extent, event,
+   and string.
+
+   Note that strings are special in that they are actually stored in
+   two parts: a structure containing information about the string, and
+   the actual data associated with the string.  The former structure
+   (a struct Lisp_String) is a fixed-size structure and is managed the
+   same way as all the other such types.  This structure contains a
+   pointer to the actual string data, which is stored in structures of
+   type struct string_chars_block.  Each string_chars_block consists
+   of a pointer to a struct Lisp_String, followed by the data for that
+   string, followed by another pointer to a struct Lisp_String,
+   followed by the data for that string, etc.  At GC time, the data in
+   these blocks is compacted by searching sequentially through all the
+   blocks and compressing out any holes created by unmarked strings.
+   Strings that are more than a certain size (bigger than the size of
+   a string_chars_block, although something like half as big might
+   make more sense) are malloc()ed separately and not stored in
+   string_chars_blocks.  Furthermore, no one string stretches across
+   two string_chars_blocks.
+
+   Vectors are each malloc()ed separately, similar to lcrecords.
+   
+   In the following discussion, we use conses, but it applies equally
+   well to the other fixed-size types.
+
+   We store cons cells inside of cons_blocks, allocating a new
+   cons_block with malloc() whenever necessary.  Cons cells reclaimed
+   by GC are put on a free list to be reallocated before allocating
+   any new cons cells from the latest cons_block.  Each cons_block is
+   just under 2^n - MALLOC_OVERHEAD bytes long, since malloc (at least
+   the versions in malloc.c and gmalloc.c) really allocates in units
+   of powers of two and uses 4 bytes for its own overhead.
+
+   What GC actually does is to search through all the cons_blocks,
+   from the most recently allocated to the oldest, and put all
+   cons cells that are not marked (whether or not they're already
+   free) on a cons_free_list.  The cons_free_list is a stack, and
+   so the cons cells in the oldest-allocated cons_block end up
+   at the head of the stack and are the first to be reallocated.
+   If any cons_block is entirely free, it is freed with free()
+   and its cons cells removed from the cons_free_list.  Because
+   the cons_free_list ends up basically in memory order, we have
+   a high locality of reference (assuming a reasonable turnover
+   of allocating and freeing) and have a reasonable probability
+   of entirely freeing up cons_blocks that have been more recently
+   allocated.  This stage is called the "sweep stage" of GC, and
+   is executed after the "mark stage", which involves starting
+   from all places that are known to point to in-use Lisp objects
+   (e.g. the obarray, where are all symbols are stored; the
+   current catches and condition-cases; the backtrace list of
+   currently executing functions; the gcpro list; etc.) and
+   recursively marking all objects that are accessible.
+
+   At the beginning of the sweep stage, the conses in the cons
+   blocks are in one of three states: in use and marked, in use
+   but not marked, and not in use (already freed).  Any conses
+   that are marked have been marked in the mark stage just
+   executed, because as part of the sweep stage we unmark any
+   marked objects.  The way we tell whether or not a cons cell
+   is in use is through the FREE_STRUCT_P macro.  This basically
+   looks at the first 4 bytes (or however many bytes a pointer
+   fits in) to see if all the bits in those bytes are 1.  The
+   resulting value (0xFFFFFFFF) is not a valid pointer and is
+   not a valid Lisp_Object.  All current fixed-size types have
+   a pointer or Lisp_Object as their first element with the
+   exception of strings; they have a size value, which can
+   never be less than zero, and so 0xFFFFFFFF is invalid for
+   strings as well.  Now assuming that a cons cell is in use,
+   the way we tell whether or not it is marked is to look at
+   the mark bit of its car (each Lisp_Object has one bit
+   reserved as a mark bit, in case it's needed).  Note that
+   different types of objects use different fields to indicate
+   whether the object is marked, but the principle is the same.
+
+   Conses on the free_cons_list are threaded through a pointer
+   stored in the bytes directly after the bytes that are set
+   to 0xFFFFFFFF (we cannot overwrite these because the cons
+   is still in a cons_block and needs to remain marked as
+   not in use for the next time that GC happens).  This
+   implies that all fixed-size types must be at least big
+   enough to store two pointers, which is indeed the case
+   for all current fixed-size types.
+
+   Some types of objects need additional "finalization" done
+   when an object is converted from in use to not in use;
+   this is the purpose of the ADDITIONAL_FREE_type macro.
+   For example, markers need to be removed from the chain
+   of markers that is kept in each buffer.  This is because
+   markers in a buffer automatically disappear if the marker
+   is no longer referenced anywhere (the same does not
+   apply to extents, however).
+
+   WARNING: Things are in an extremely bizarre state when
+   the ADDITIONAL_FREE_type macros are called, so beware!
+
+   When ERROR_CHECK_GC is defined, we do things differently
+   so as to maximize our chances of catching places where
+   there is insufficient GCPROing.  The thing we want to
+   avoid is having an object that we're using but didn't
+   GCPRO get freed by GC and then reallocated while we're
+   in the process of using it -- this will result in something
+   seemingly unrelated getting trashed, and is extremely
+   difficult to track down.  If the object gets freed but
+   not reallocated, we can usually catch this because we
+   set all bytes of a freed object to 0xDEADBEEF. (The
+   first four bytes, however, are 0xFFFFFFFF, and the next
+   four are a pointer used to chain freed objects together;
+   we play some tricks with this pointer to make it more
+   bogus, so crashes are more likely to occur right away.)
+
+   We want freed objects to stay free as long as possible,
+   so instead of doing what we do above, we maintain the
+   free objects in a first-in first-out queue.  We also
+   don't recompute the free list each GC, unlike above;
+   this ensures that the queue ordering is preserved.
+   [This means that we are likely to have worse locality
+   of reference, and that we can never free a frob block
+   once it's allocated. (Even if we know that all cells
+   in it are free, there's no easy way to remove all those
+   cells from the free list because the objects on the
+   free list are unlikely to be in memory order.)]
+   Furthermore, we never take objects off the free list
+   unless there's a large number (usually 1000, but
+   varies depending on type) of them already on the list.
+   This way, we ensure that an object that gets freed will
+   remain free for the next 1000 (or whatever) times that
+   an object of that type is allocated.
+*/
+
+#ifndef MALLOC_OVERHEAD
+#ifdef GNU_MALLOC
+#define MALLOC_OVERHEAD 0
+#elif defined (rcheck)
+#define MALLOC_OVERHEAD 20
+#else
+#define MALLOC_OVERHEAD 8
+#endif
+#endif
+
+#ifdef ALLOC_NO_POOLS
+# define TYPE_ALLOC_SIZE(type, structtype) 1
+#else
+# define TYPE_ALLOC_SIZE(type, structtype)			\
+    ((2048 - MALLOC_OVERHEAD - sizeof (struct type##_block *))	\
+     / sizeof (structtype))
+#endif
+
+#define DECLARE_FIXED_TYPE_ALLOC(type, structtype)			  \
+									  \
+struct type##_block							  \
+{									  \
+  struct type##_block *prev;						  \
+  structtype block[TYPE_ALLOC_SIZE (type, structtype)];			  \
+};									  \
+									  \
+static struct type##_block *current_##type##_block;			  \
+static int current_##type##_block_index;				  \
+									  \
+static structtype *type##_free_list;					  \
+static structtype *type##_free_list_tail;				  \
+									  \
+static void								  \
+init_##type##_alloc (void)						  \
+{									  \
+  current_##type##_block = 0;						  \
+  current_##type##_block_index = countof (current_##type##_block->block); \
+  type##_free_list = 0;							  \
+  type##_free_list_tail = 0;						  \
+}									  \
+									  \
+static int gc_count_num_##type##_in_use, gc_count_num_##type##_freelist
+
+#define ALLOCATE_FIXED_TYPE_FROM_BLOCK(type, result)			\
+  do {									\
+    if (current_##type##_block_index					\
+	== countof (current_##type##_block->block))			\
+    {									\
+      struct type##_block *__new__					\
+         = allocate_lisp_storage (sizeof (struct type##_block));	\
+      __new__->prev = current_##type##_block;				\
+      current_##type##_block = __new__;					\
+      current_##type##_block_index = 0;					\
+    }									\
+    (result) =								\
+      &(current_##type##_block->block[current_##type##_block_index++]);	\
+  } while (0)
+
+/* Allocate an instance of a type that is stored in blocks.
+   TYPE is the "name" of the type, STRUCTTYPE is the corresponding
+   structure type. */
+
+#ifdef ERROR_CHECK_GC
+
+/* Note: if you get crashes in this function, suspect incorrect calls
+   to free_cons() and friends.  This happened once because the cons
+   cell was not GC-protected and was getting collected before
+   free_cons() was called. */
+
+#define ALLOCATE_FIXED_TYPE_1(type, structtype, result)			 \
+do									 \
+{									 \
+  if (gc_count_num_##type##_freelist >					 \
+      MINIMUM_ALLOWED_FIXED_TYPE_CELLS_##type) 				 \
+    {									 \
+      result = type##_free_list;					 \
+      /* Before actually using the chain pointer, we complement all its	 \
+         bits; see FREE_FIXED_TYPE(). */				 \
+      type##_free_list =						 \
+        (structtype *) ~(unsigned long)					 \
+          (* (structtype **) ((char *) result + sizeof (void *)));	 \
+      gc_count_num_##type##_freelist--;					 \
+    }									 \
+  else									 \
+    ALLOCATE_FIXED_TYPE_FROM_BLOCK (type, result);			 \
+  MARK_STRUCT_AS_NOT_FREE (result);					 \
+} while (0)
+
+#else
+
+#define ALLOCATE_FIXED_TYPE_1(type, structtype, result)		\
+do								\
+{								\
+  if (type##_free_list)						\
+    {								\
+      result = type##_free_list;				\
+      type##_free_list =					\
+        * (structtype **) ((char *) result + sizeof (void *));	\
+    }								\
+  else								\
+    ALLOCATE_FIXED_TYPE_FROM_BLOCK (type, result);		\
+  MARK_STRUCT_AS_NOT_FREE (result);				\
+} while (0)
+
+#endif
+
+#define ALLOCATE_FIXED_TYPE(type, structtype, result)	\
+do							\
+{							\
+  ALLOCATE_FIXED_TYPE_1 (type, structtype, result);	\
+  INCREMENT_CONS_COUNTER (sizeof (structtype), #type);	\
+} while (0)
+
+#define NOSEEUM_ALLOCATE_FIXED_TYPE(type, structtype, result)	\
+do								\
+{								\
+  ALLOCATE_FIXED_TYPE_1 (type, structtype, result);		\
+  NOSEEUM_INCREMENT_CONS_COUNTER (sizeof (structtype), #type);	\
+} while (0)
+
+/* INVALID_POINTER_VALUE should be a value that is invalid as a pointer
+   to a Lisp object and invalid as an actual Lisp_Object value.  We have
+   to make sure that this value cannot be an integer in Lisp_Object form.
+   0xFFFFFFFF could be so on a 64-bit system, so we extend it to 64 bits.
+   On a 32-bit system, the type bits will be non-zero, making the value
+   be a pointer, and the pointer will be misaligned.
+
+   Even if Emacs is run on some weirdo system that allows and allocates
+   byte-aligned pointers, this pointer is at the very top of the address
+   space and so it's almost inconceivable that it could ever be valid. */
+   
+#if INTBITS == 32
+# define INVALID_POINTER_VALUE 0xFFFFFFFF
+#elif INTBITS == 48
+# define INVALID_POINTER_VALUE 0xFFFFFFFFFFFF
+#elif INTBITS == 64
+# define INVALID_POINTER_VALUE 0xFFFFFFFFFFFFFFFF
+#else
+You have some weird system and need to supply a reasonable value here.
+#endif
+
+#define FREE_STRUCT_P(ptr) \
+  (* (void **) ptr == (void *) INVALID_POINTER_VALUE)
+#define MARK_STRUCT_AS_FREE(ptr) \
+  (* (void **) ptr = (void *) INVALID_POINTER_VALUE)
+#define MARK_STRUCT_AS_NOT_FREE(ptr) \
+  (* (void **) ptr = 0)
+
+#ifdef ERROR_CHECK_GC
+
+#define PUT_FIXED_TYPE_ON_FREE_LIST(type, structtype, ptr)		\
+do { if (type##_free_list_tail)						\
+       {								\
+	 /* When we store the chain pointer, we complement all		\
+	    its bits; this should significantly increase its		\
+	    bogosity in case someone tries to use the value, and	\
+	    should make us dump faster if someone stores something	\
+	    over the pointer because when it gets un-complemented in	\
+	    ALLOCATED_FIXED_TYPE(), the resulting pointer will be	\
+	    extremely bogus. */						\
+	 * (structtype **)						\
+	   ((char *) type##_free_list_tail + sizeof (void *)) =		\
+	     (structtype *) ~(unsigned long) ptr;			\
+       }								\
+     else								\
+       type##_free_list = ptr;						\
+     type##_free_list_tail = ptr;					\
+   } while (0)
+
+#else
+
+#define PUT_FIXED_TYPE_ON_FREE_LIST(type, structtype, ptr)	\
+do { * (structtype **) ((char *) ptr + sizeof (void *)) =	\
+       type##_free_list;					\
+     type##_free_list = ptr;					\
+   } while (0)
+
+#endif
+
+/* TYPE and STRUCTTYPE are the same as in ALLOCATE_FIXED_TYPE(). */
+
+#define FREE_FIXED_TYPE(type, structtype, ptr)			\
+do { structtype *_weird_ = (ptr);				\
+     ADDITIONAL_FREE_##type (_weird_);				\
+     deadbeef_memory (ptr, sizeof (structtype));		\
+     PUT_FIXED_TYPE_ON_FREE_LIST (type, structtype, ptr);	\
+     MARK_STRUCT_AS_FREE (_weird_);				\
+   } while (0)
+
+/* Like FREE_FIXED_TYPE() but used when we are explicitly
+   freeing a structure through free_cons(), free_marker(), etc.
+   rather than through the normal process of sweeping.
+   We attempt to undo the changes made to the allocation counters
+   as a result of this structure being allocated.  This is not
+   completely necessary but helps keep things saner: e.g. this way,
+   repeatedly allocating and freeing a cons will not result in
+   the consing-since-gc counter advancing, which would cause a GC
+   and somewhat defeat the purpose of explicitly freeing. */
+
+#define FREE_FIXED_TYPE_WHEN_NOT_IN_GC(type, structtype, ptr)	\
+do { FREE_FIXED_TYPE (type, structtype, ptr);			\
+     DECREMENT_CONS_COUNTER (sizeof (structtype));		\
+     gc_count_num_##type##_freelist++;				\
+   } while (0)
+     
+
+
+/**********************************************************************/
+/*                         Cons allocation                            */
+/**********************************************************************/
+
+DECLARE_FIXED_TYPE_ALLOC (cons, struct Lisp_Cons);
+/* conses are used and freed so often that we set this really high */
+/* #define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_cons 20000 */
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_cons 2000
+
+DEFUN ("cons", Fcons, Scons, 2, 2, 0 /*
+Create a new cons, give it CAR and CDR as components, and return it.
+*/ )
+  (car, cdr)
+     Lisp_Object car, cdr;
+{
+  /* This cannot GC. */
+  Lisp_Object val = Qnil;
+  struct Lisp_Cons *c;
+
+  ALLOCATE_FIXED_TYPE (cons, struct Lisp_Cons, c);
+  XSETCONS (val, c);
+  XCAR (val) = car;
+  XCDR (val) = cdr;
+  return val;
+}
+
+/* This is identical to Fcons() but it used for conses that we're
+   going to free later, and is useful when trying to track down
+   "real" consing. */
+Lisp_Object
+noseeum_cons (Lisp_Object car, Lisp_Object cdr)
+{
+  Lisp_Object val = Qnil;
+  struct Lisp_Cons *c;
+
+  NOSEEUM_ALLOCATE_FIXED_TYPE (cons, struct Lisp_Cons, c);
+  XSETCONS (val, c);
+  XCAR (val) = car;
+  XCDR (val) = cdr;
+  return val;
+}
+
+DEFUN ("list", Flist, Slist, 0, MANY, 0 /*
+Return a newly created list with specified arguments as elements.
+Any number of arguments, even zero arguments, are allowed.
+*/ )
+  (nargs, args)
+     int nargs;
+     Lisp_Object *args;
+{
+  Lisp_Object len, val, val_tail;
+
+  len = make_int (nargs);
+  val = Fmake_list (len, Qnil);
+  val_tail = val;
+  while (!NILP (val_tail))
+    {
+      XCAR (val_tail) = *args++;
+      val_tail = XCDR (val_tail);
+    }
+  return val;
+}
+
+Lisp_Object
+list1 (Lisp_Object obj0)
+{
+  /* This cannot GC. */
+  return (Fcons (obj0, Qnil));
+}
+
+Lisp_Object
+list2 (Lisp_Object obj0, Lisp_Object obj1)
+{
+  /* This cannot GC. */
+  return Fcons (obj0, list1 (obj1));
+}
+
+Lisp_Object
+list3 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2)
+{
+  /* This cannot GC. */
+  return Fcons (obj0, list2 (obj1, obj2));
+}
+
+static Lisp_Object
+cons3 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2)
+{
+  /* This cannot GC. */
+  return Fcons (obj0, Fcons (obj1, obj2));
+}
+
+Lisp_Object
+list4 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2, Lisp_Object obj3)
+{
+  /* This cannot GC. */
+  return Fcons (obj0, list3 (obj1, obj2, obj3));
+}
+
+Lisp_Object
+list5 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2, Lisp_Object obj3,
+       Lisp_Object obj4)
+{
+  /* This cannot GC. */
+  return Fcons (obj0, list4 (obj1, obj2, obj3, obj4));
+}
+
+Lisp_Object
+list6 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2, Lisp_Object obj3,
+       Lisp_Object obj4, Lisp_Object obj5)
+{
+  /* This cannot GC. */
+  return Fcons (obj0, list5 (obj1, obj2, obj3, obj4, obj5));
+}
+
+DEFUN ("make-list", Fmake_list, Smake_list, 2, 2, 0 /*
+Return a newly created list of length LENGTH, with each element being INIT.
+*/ )
+     (length, init)
+     Lisp_Object length, init;
+{
+  Lisp_Object val;
+  int size;
+
+  CHECK_NATNUM (length);
+  size = XINT (length);
+
+  val = Qnil;
+  while (size-- > 0)
+    val = Fcons (init, val);
+  return val;
+}
+
+
+/**********************************************************************/
+/*                        Float allocation                            */
+/**********************************************************************/
+
+#ifdef LISP_FLOAT_TYPE
+
+DECLARE_FIXED_TYPE_ALLOC (float, struct Lisp_Float);
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_float 1000
+
+Lisp_Object
+make_float (double float_value)
+{
+  Lisp_Object val;
+  struct Lisp_Float *f;
+
+  ALLOCATE_FIXED_TYPE (float, struct Lisp_Float, f);
+  f->lheader.implementation = lrecord_float;
+  float_next (f) = ((struct Lisp_Float *) -1);
+  float_data (f) = float_value;
+  XSETFLOAT (val, f);
+  return (val);
+}
+
+#endif /* LISP_FLOAT_TYPE */
+
+
+/**********************************************************************/
+/*                         Vector allocation                          */
+/**********************************************************************/
+
+static Lisp_Object all_vectors;
+
+/* #### should allocate `small' vectors from a frob-block */
+static struct Lisp_Vector *
+make_vector_internal (EMACS_INT sizei)
+{
+  EMACS_INT sizem = (sizeof (struct Lisp_Vector)
+               /* -1 because struct Lisp_Vector includes 1 slot,
+                * +1 to account for vector_next */
+               + (sizei - 1 + 1) * sizeof (Lisp_Object)
+               );
+  struct Lisp_Vector *p = allocate_lisp_storage (sizem);
+#ifdef LRECORD_VECTOR
+  set_lheader_implementation (&(p->lheader), lrecord_vector);
+#endif
+
+  INCREMENT_CONS_COUNTER (sizem, "vector");
+
+  p->size = sizei;
+  vector_next (p) = all_vectors;
+  XSETVECTOR (all_vectors, p);
+  return (p);
+}
+
+Lisp_Object
+make_vector (EMACS_INT length, Lisp_Object init)
+{
+  EMACS_INT elt;
+  Lisp_Object vector = Qnil;
+  struct Lisp_Vector *p;
+
+  if (length < 0)
+    length = XINT (wrong_type_argument (Qnatnump, make_int (length)));
+
+  p = make_vector_internal (length);
+  XSETVECTOR (vector, p);
+
+#if 0
+  /* Initialize big arrays full of 0's quickly, for what that's worth */
+  {
+    char *travesty = (char *) &init;
+    for (i = 1; i < sizeof (Lisp_Object); i++)
+    {
+      if (travesty[i] != travesty[0])
+        goto fill;
+    }
+    memset (vector_data (p), travesty[0], length * sizeof (Lisp_Object));
+    return (vector);
+  }
+ fill:
+#endif
+  for (elt = 0; elt < length; elt++)
+    vector_data(p)[elt] = init;
+
+  return (vector);
+}
+
+DEFUN ("make-vector", Fmake_vector, Smake_vector, 2, 2, 0 /*
+Return a newly created vector of length LENGTH, with each element being INIT.
+See also the function `vector'.
+*/ )
+     (length, init)
+     Lisp_Object length, init;
+{
+  if (!INTP (length) || XINT (length) < 0)
+    length = wrong_type_argument (Qnatnump, length);
+
+  return (make_vector (XINT (length), init));
+}
+
+DEFUN ("vector", Fvector, Svector, 0, MANY, 0 /*
+Return a newly created vector with specified arguments as elements.
+Any number of arguments, even zero arguments, are allowed.
+*/ )
+     (nargs, args)
+     int nargs;
+     Lisp_Object *args;
+{
+  Lisp_Object vector = Qnil;
+  int elt;
+  struct Lisp_Vector *p;
+
+  p = make_vector_internal (nargs);
+  XSETVECTOR (vector, p);
+
+  for (elt = 0; elt < nargs; elt++)
+    vector_data(p)[elt] = args[elt];
+
+  return (vector);
+}
+
+Lisp_Object
+vector1 (Lisp_Object obj0)
+{
+  return Fvector (1, &obj0);
+}
+
+Lisp_Object
+vector2 (Lisp_Object obj0, Lisp_Object obj1)
+{
+  Lisp_Object args[2];
+  args[0] = obj0;
+  args[1] = obj1;
+  return Fvector (2, args);
+}
+
+Lisp_Object
+vector3 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2)
+{
+  Lisp_Object args[3];
+  args[0] = obj0;
+  args[1] = obj1;
+  args[2] = obj2;
+  return Fvector (3, args);
+}
+
+Lisp_Object
+vector4 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2,
+	 Lisp_Object obj3)
+{
+  Lisp_Object args[4];
+  args[0] = obj0;
+  args[1] = obj1;
+  args[2] = obj2;
+  args[3] = obj3;
+  return Fvector (4, args);
+}
+
+Lisp_Object
+vector5 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2,
+	 Lisp_Object obj3, Lisp_Object obj4)
+{
+  Lisp_Object args[5];
+  args[0] = obj0;
+  args[1] = obj1;
+  args[2] = obj2;
+  args[3] = obj3;
+  args[4] = obj4;
+  return Fvector (5, args);
+}
+
+Lisp_Object
+vector6 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2,
+	 Lisp_Object obj3, Lisp_Object obj4, Lisp_Object obj5)
+{
+  Lisp_Object args[6];
+  args[0] = obj0;
+  args[1] = obj1;
+  args[2] = obj2;
+  args[3] = obj3;
+  args[4] = obj4;
+  args[5] = obj5;
+  return Fvector (6, args);
+}
+
+Lisp_Object
+vector7 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2,
+	 Lisp_Object obj3, Lisp_Object obj4, Lisp_Object obj5,
+	 Lisp_Object obj6)
+{
+  Lisp_Object args[7];
+  args[0] = obj0;
+  args[1] = obj1;
+  args[2] = obj2;
+  args[3] = obj3;
+  args[4] = obj4;
+  args[5] = obj5;
+  args[6] = obj6;
+  return Fvector (7, args);
+}
+
+Lisp_Object
+vector8 (Lisp_Object obj0, Lisp_Object obj1, Lisp_Object obj2,
+	 Lisp_Object obj3, Lisp_Object obj4, Lisp_Object obj5,
+	 Lisp_Object obj6, Lisp_Object obj7)
+{
+  Lisp_Object args[8];
+  args[0] = obj0;
+  args[1] = obj1;
+  args[2] = obj2;
+  args[3] = obj3;
+  args[4] = obj4;
+  args[5] = obj5;
+  args[6] = obj6;
+  args[7] = obj7;
+  return Fvector (8, args);
+}
+
+/**********************************************************************/
+/*                       Bit Vector allocation                        */
+/**********************************************************************/
+
+static Lisp_Object all_bit_vectors;
+
+/* #### should allocate `small' bit vectors from a frob-block */
+static struct Lisp_Bit_Vector *
+make_bit_vector_internal (EMACS_INT sizei)
+{
+  EMACS_INT sizem = (sizeof (struct Lisp_Bit_Vector) +
+               /* -1 because struct Lisp_Bit_Vector includes 1 slot */
+	       sizeof (long) * (BIT_VECTOR_LONG_STORAGE (sizei) - 1));
+  struct Lisp_Bit_Vector *p = allocate_lisp_storage (sizem);
+  set_lheader_implementation (&(p->lheader), lrecord_bit_vector);
+
+  INCREMENT_CONS_COUNTER (sizem, "bit-vector");
+
+  bit_vector_length (p) = sizei;
+  bit_vector_next (p) = all_bit_vectors;
+  /* make sure the extra bits in the last long are 0; the calling
+     functions might not set them. */
+  p->bits[BIT_VECTOR_LONG_STORAGE (sizei) - 1] = 0;
+  XSETBIT_VECTOR (all_bit_vectors, p);
+  return (p);
+}
+
+Lisp_Object
+make_bit_vector (EMACS_INT length, Lisp_Object init)
+{
+  Lisp_Object bit_vector = Qnil;
+  struct Lisp_Bit_Vector *p;
+  EMACS_INT num_longs;
+
+  if (length < 0)
+    length = XINT (wrong_type_argument (Qnatnump, make_int (length)));
+
+  CHECK_BIT (init);
+
+  num_longs = BIT_VECTOR_LONG_STORAGE (length);
+  p = make_bit_vector_internal (length);
+  XSETBIT_VECTOR (bit_vector, p);
+
+  if (ZEROP (init))
+    memset (p->bits, 0, num_longs * sizeof (long));
+  else
+    {
+      EMACS_INT bits_in_last = length & (LONGBITS_POWER_OF_2 - 1);
+      memset (p->bits, ~0, num_longs * sizeof (long));
+      /* But we have to make sure that the unused bits in the
+	 last integer are 0, so that equal/hash is easy. */
+      if (bits_in_last)
+	p->bits[num_longs - 1] &= (1 << bits_in_last) - 1;
+    }
+
+  return (bit_vector);
+}
+
+Lisp_Object
+make_bit_vector_from_byte_vector (unsigned char *bytevec, EMACS_INT length)
+{
+  Lisp_Object bit_vector = Qnil;
+  struct Lisp_Bit_Vector *p;
+  EMACS_INT i;
+
+  if (length < 0)
+    length = XINT (wrong_type_argument (Qnatnump, make_int (length)));
+
+  p = make_bit_vector_internal (length);
+  XSETBIT_VECTOR (bit_vector, p);
+
+  for (i = 0; i < length; i++)
+    set_bit_vector_bit (p, i, bytevec[i]);
+
+  return bit_vector;
+}
+
+DEFUN ("make-bit-vector", Fmake_bit_vector, Smake_bit_vector, 2, 2, 0 /*
+Return a newly created bit vector of length LENGTH.
+Each element is set to INIT.  See also the function `bit-vector'.
+*/ )
+     (length, init)
+     Lisp_Object length, init;
+{
+  if (!INTP (length) || XINT (length) < 0)
+    length = wrong_type_argument (Qnatnump, length);
+
+  return (make_bit_vector (XINT (length), init));
+}
+
+DEFUN ("bit-vector", Fbit_vector, Sbit_vector, 0, MANY, 0 /*
+Return a newly created bit vector with specified arguments as elements.
+Any number of arguments, even zero arguments, are allowed.
+*/ )
+     (nargs, args)
+     int nargs;
+     Lisp_Object *args;
+{
+  Lisp_Object bit_vector = Qnil;
+  int elt;
+  struct Lisp_Bit_Vector *p;
+
+  for (elt = 0; elt < nargs; elt++)
+    CHECK_BIT (args[elt]);
+
+  p = make_bit_vector_internal (nargs);
+  XSETBIT_VECTOR (bit_vector, p);
+
+  for (elt = 0; elt < nargs; elt++)
+    set_bit_vector_bit (p, elt, !ZEROP (args[elt]));
+
+  return (bit_vector);
+}
+
+
+/**********************************************************************/
+/*                   Compiled-function allocation                     */
+/**********************************************************************/
+
+DECLARE_FIXED_TYPE_ALLOC (compiled_function, struct Lisp_Compiled_Function);
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_compiled_function 1000
+
+static Lisp_Object
+make_compiled_function (int make_pure)
+{
+  struct Lisp_Compiled_Function *b;
+  Lisp_Object new;
+  int size = sizeof (struct Lisp_Compiled_Function);
+
+  if (make_pure && check_purespace (size))
+    {
+      b = (struct Lisp_Compiled_Function *) (PUREBEG + pureptr);
+      set_lheader_implementation (&(b->lheader), lrecord_compiled_function);
+      pureptr += size;
+      bump_purestat (&purestat_bytecode, size);
+    }
+  else
+    {
+      ALLOCATE_FIXED_TYPE (compiled_function, struct Lisp_Compiled_Function,
+			   b);
+      set_lheader_implementation (&(b->lheader), lrecord_compiled_function);
+    }
+  b->maxdepth = 0;
+  b->flags.documentationp = 0;
+  b->flags.interactivep = 0;
+  b->flags.domainp = 0; /* I18N3 */
+  b->bytecodes = Qzero;
+  b->constants = Qzero;
+  b->arglist = Qnil;
+  b->doc_and_interactive = Qnil;
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+  b->annotated = Qnil;
+#endif
+  XSETCOMPILED_FUNCTION (new, b);
+  return (new);
+}
+
+DEFUN ("make-byte-code", Fmake_byte_code, Smake_byte_code, 4, MANY, 0 /*
+Create a compiled-function object.
+Usage: (arglist instructions constants stack-size
+	&optional doc-string interactive-spec)
+Note that, unlike all other emacs-lisp functions, calling this with five
+arguments is NOT the same as calling it with six arguments, the last of
+which is nil.  If the INTERACTIVE arg is specified as nil, then that means
+that this function was defined with `(interactive)'.  If the arg is not
+specified, then that means the function is not interactive.
+This is terrible behavior which is retained for compatibility with old
+`.elc' files which expected these semantics.
+*/ )
+     (nargs, args)
+     int nargs;
+     Lisp_Object *args;
+{
+/*   In a non-insane world this function would have this arglist...
+     (arglist, instructions, constants, stack_size, doc_string, interactive)
+     Lisp_Object arglist, instructions, constants, stack_size, doc_string,
+	interactive;
+ */
+  Lisp_Object arglist      = args[0];
+  Lisp_Object instructions = args[1];
+  Lisp_Object constants    = args[2];
+  Lisp_Object stack_size   = args[3];
+  Lisp_Object doc_string   = ((nargs > 4) ? args[4] : Qnil);
+  Lisp_Object interactive  = ((nargs > 5) ? args[5] : Qunbound);
+  /* Don't purecopy the doc references in instructions because it's
+     wasteful; they will get fixed up later.
+
+     #### If something goes wrong and they don't get fixed up,
+     we're screwed, because pure stuff isn't marked and thus the
+     cons references won't be marked and will get reused.
+
+     Note: there will be a window after the byte code is created and
+     before the doc references are fixed up in which there will be
+     impure objects inside a pure object, which apparently won't
+     get marked, leading the trouble.  But during that entire window,
+     the objects are sitting on Vload_force_doc_string_list, which
+     is staticpro'd, so we're OK. */
+  int purecopy_instructions = 1;
+
+  if (nargs > 6)
+    return Fsignal (Qwrong_number_of_arguments, 
+		    list2 (intern ("make-byte-code"), make_int (nargs)));
+
+  CHECK_LIST (arglist);
+  /* instructions is a string or a cons (string . int) for a
+     lazy-loaded function. */
+  if (CONSP (instructions))
+    {
+      CHECK_STRING (XCAR (instructions));
+      CHECK_INT (XCDR (instructions));
+      if (!NILP (constants))
+	CHECK_VECTOR (constants);
+      purecopy_instructions = 0;
+    }
+  else
+    {
+      CHECK_STRING (instructions);
+      CHECK_VECTOR (constants);
+    }
+  CHECK_NATNUM (stack_size);
+  /* doc_string may be nil, string, int, or a cons (string . int). */
+
+  /* interactive may be list or string (or unbound). */
+
+  if (purify_flag)
+    {
+      if (!purified (arglist))
+	arglist = Fpurecopy (arglist);
+      if (purecopy_instructions && !purified (instructions))
+	instructions = Fpurecopy (instructions);
+      if (!purified (doc_string))
+	doc_string = Fpurecopy (doc_string);
+      if (!purified (interactive) && !UNBOUNDP (interactive))
+	interactive = Fpurecopy (interactive);
+
+      /* Statistics are kept differently for the constants */
+      if (!purified (constants))
+#ifdef PURESTAT
+	{
+	  int old = purecopying_for_bytecode;
+	  purecopying_for_bytecode = 1;
+	  constants = Fpurecopy (constants);
+	  purecopying_for_bytecode = old;
+	}
+#else
+        constants = Fpurecopy (constants);
+#endif /* PURESTAT */
+
+#ifdef PURESTAT
+      if (STRINGP (instructions))
+	bump_purestat (&purestat_string_bytecodes, pure_sizeof (instructions));
+      if (VECTORP (constants))
+	bump_purestat (&purestat_vector_bytecode_constants,
+		       pure_sizeof (constants));
+      if (STRINGP (doc_string))
+	/* These should be have been snagged by make-docfile... */
+	bump_purestat (&purestat_string_documentation,
+		       pure_sizeof (doc_string));
+      if (STRINGP (interactive))
+	bump_purestat (&purestat_string_interactive,
+		       pure_sizeof (interactive));
+#endif /* PURESTAT */
+    }
+  
+  {
+    int docp = !NILP (doc_string);
+    int intp = !UNBOUNDP (interactive);
+#ifdef I18N3
+    int domp = !NILP (Vfile_domain);
+#endif
+    Lisp_Object val = make_compiled_function (purify_flag);
+    struct Lisp_Compiled_Function *b = XCOMPILED_FUNCTION (val);
+    b->flags.documentationp = docp;
+    b->flags.interactivep   = intp;
+#ifdef I18N3
+    b->flags.domainp        = domp;
+#endif
+    b->maxdepth  = XINT (stack_size);
+    b->bytecodes = instructions;
+    b->constants = constants;
+    b->arglist   = arglist;
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+    if (!NILP (Vcurrent_compiled_function_annotation))
+      b->annotated = Fpurecopy (Vcurrent_compiled_function_annotation);
+    else if (!NILP (Vload_file_name_internal_the_purecopy))
+      b->annotated = Vload_file_name_internal_the_purecopy;
+    else if (!NILP (Vload_file_name_internal))
+      {
+	Vload_file_name_internal_the_purecopy =
+	  Fpurecopy (Ffile_name_nondirectory (Vload_file_name_internal));
+	b->annotated = Vload_file_name_internal_the_purecopy;
+      }
+#endif
+
+#ifdef I18N3
+    if (docp && intp && domp)
+      b->doc_and_interactive = (((purify_flag) ? pure_cons : Fcons)
+				(doc_string,
+				 (((purify_flag) ? pure_cons : Fcons)
+				  (interactive, Vfile_domain))));
+    else if (docp && domp)
+      b->doc_and_interactive = (((purify_flag) ? pure_cons : Fcons)
+				(doc_string, Vfile_domain));
+    else if (intp && domp)
+      b->doc_and_interactive = (((purify_flag) ? pure_cons : Fcons)
+				(interactive, Vfile_domain));
+    else
+#endif
+    if (docp && intp)
+      b->doc_and_interactive = (((purify_flag) ? pure_cons : Fcons)
+				(doc_string, interactive));
+    else if (intp)
+      b->doc_and_interactive = interactive;
+#ifdef I18N3
+    else if (domp)
+      b->doc_and_interactive = Vfile_domain;
+#endif
+    else
+      b->doc_and_interactive = doc_string;
+
+    return (val);
+  }
+}
+
+
+/**********************************************************************/
+/*                          Symbol allocation                         */
+/**********************************************************************/
+
+DECLARE_FIXED_TYPE_ALLOC (symbol, struct Lisp_Symbol);
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_symbol 1000
+
+DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0 /*
+Return a newly allocated uninterned symbol whose name is NAME.
+Its value and function definition are void, and its property list is nil.
+*/ )
+  (str)
+     Lisp_Object str;
+{
+  Lisp_Object val;
+  struct Lisp_Symbol *p;
+
+  CHECK_STRING (str);
+
+  ALLOCATE_FIXED_TYPE (symbol, struct Lisp_Symbol, p);
+#ifdef LRECORD_SYMBOL
+  set_lheader_implementation (&(p->lheader), lrecord_symbol);
+#endif
+  p->name = XSTRING (str);
+  p->plist = Qnil;
+  p->value = Qunbound;
+  p->function = Qunbound;
+  symbol_next (p) = 0;
+  XSETSYMBOL (val, p);
+  return val;
+}
+
+
+/**********************************************************************/
+/*                         Extent allocation                          */
+/**********************************************************************/
+
+DECLARE_FIXED_TYPE_ALLOC (extent, struct extent);
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_extent 1000
+
+struct extent *
+allocate_extent (void)
+{
+  struct extent *e;
+
+  ALLOCATE_FIXED_TYPE (extent, struct extent, e);
+  /* memset (e, 0, sizeof (struct extent)); */
+  set_lheader_implementation (&(e->lheader), lrecord_extent);
+  extent_object (e) = Qnil;
+  set_extent_start (e, -1);
+  set_extent_end (e, -1);
+  e->plist = Qnil;
+
+  memset (&e->flags, 0, sizeof (e->flags));
+
+  extent_face (e) = Qnil;
+  e->flags.end_open = 1;  /* default is for endpoints to behave like markers */
+  e->flags.detachable = 1;
+
+  return (e);
+}
+
+
+/**********************************************************************/
+/*                         Event allocation                           */
+/**********************************************************************/
+
+DECLARE_FIXED_TYPE_ALLOC (event, struct Lisp_Event);
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_event 1000
+
+Lisp_Object
+allocate_event (void)
+{
+  Lisp_Object val;
+  struct Lisp_Event *e;
+
+  ALLOCATE_FIXED_TYPE (event, struct Lisp_Event, e);
+  set_lheader_implementation (&(e->lheader), lrecord_event);
+
+  XSETEVENT (val, e);
+  return val;
+}
+  
+
+/**********************************************************************/
+/*                       Marker allocation                            */
+/**********************************************************************/
+
+DECLARE_FIXED_TYPE_ALLOC (marker, struct Lisp_Marker);
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_marker 1000
+
+DEFUN ("make-marker", Fmake_marker, Smake_marker, 0, 0, 0 /*
+Return a newly allocated marker which does not point at any place.
+*/ )
+  ()
+{
+  Lisp_Object val;
+  struct Lisp_Marker *p;
+
+  ALLOCATE_FIXED_TYPE (marker, struct Lisp_Marker, p);
+  set_lheader_implementation (&(p->lheader), lrecord_marker);
+  p->buffer = 0;
+  p->memind = 0;
+  marker_next (p) = 0;
+  marker_prev (p) = 0;
+  p->insertion_type = 0;
+  XSETMARKER (val, p);
+  return val;
+}
+
+Lisp_Object
+noseeum_make_marker (void)
+{
+  Lisp_Object val;
+  struct Lisp_Marker *p;
+
+  NOSEEUM_ALLOCATE_FIXED_TYPE (marker, struct Lisp_Marker, p);
+  set_lheader_implementation (&(p->lheader), lrecord_marker);
+  p->buffer = 0;
+  p->memind = 0;
+  marker_next (p) = 0;
+  marker_prev (p) = 0;
+  p->insertion_type = 0;
+  XSETMARKER (val, p);
+  return val;
+}
+
+
+/**********************************************************************/
+/*                        String allocation                           */
+/**********************************************************************/
+
+/* The data for "short" strings generally resides inside of structs of type 
+   string_chars_block. The Lisp_String structure is allocated just like any 
+   other Lisp object (except for vectors), and these are freelisted when
+   they get garbage collected. The data for short strings get compacted,
+   but the data for large strings do not. 
+
+   Previously Lisp_String structures were relocated, but this caused a lot
+   of bus-errors because the C code didn't include enough GCPRO's for
+   strings (since EVERY REFERENCE to a short string needed to be GCPRO'd so
+   that the reference would get relocated).
+
+   This new method makes things somewhat bigger, but it is MUCH safer.  */
+
+DECLARE_FIXED_TYPE_ALLOC (string, struct Lisp_String);
+/* strings are used and freed quite often */
+/* #define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_string 10000 */
+#define MINIMUM_ALLOWED_FIXED_TYPE_CELLS_string 1000
+
+/* String blocks contain this many useful bytes. */
+#define STRING_CHARS_BLOCK_SIZE \
+  (8192 - MALLOC_OVERHEAD - ((2 * sizeof (struct string_chars_block *)) \
+                             + sizeof (EMACS_INT)))
+/* Block header for small strings. */
+struct string_chars_block
+{
+  EMACS_INT pos;
+  struct string_chars_block *next;
+  struct string_chars_block *prev;
+  /* Contents of string_chars_block->string_chars are interleaved
+     string_chars structures (see below) and the actual string data */
+  unsigned char string_chars[STRING_CHARS_BLOCK_SIZE];
+};
+
+struct string_chars_block *first_string_chars_block;
+struct string_chars_block *current_string_chars_block;
+
+/* If SIZE is the length of a string, this returns how many bytes
+ *  the string occupies in string_chars_block->string_chars
+ *  (including alignment padding).
+ */
+#define STRING_FULLSIZE(s) \
+   ALIGN_SIZE (((s) + 1 + sizeof (struct Lisp_String *)),\
+               ALIGNOF (struct Lisp_String *))
+
+#define BIG_STRING_FULLSIZE_P(fullsize) ((fullsize) >= STRING_CHARS_BLOCK_SIZE)
+#define BIG_STRING_SIZE_P(size) (BIG_STRING_FULLSIZE_P (STRING_FULLSIZE(size)))
+
+#define CHARS_TO_STRING_CHAR(x) \
+  ((struct string_chars *) \
+   (((char *) (x)) - (slot_offset (struct string_chars, chars))))
+
+
+struct string_chars
+{
+  struct Lisp_String *string;
+  unsigned char chars[1];
+};
+
+struct unused_string_chars
+{
+  struct Lisp_String *string;
+  EMACS_INT fullsize;
+};
+
+static void
+init_string_chars_alloc (void)
+{
+  first_string_chars_block = 
+    (struct string_chars_block *) xmalloc (sizeof (struct string_chars_block));
+  first_string_chars_block->prev = 0;
+  first_string_chars_block->next = 0;
+  first_string_chars_block->pos = 0;
+  current_string_chars_block = first_string_chars_block;
+}
+
+static struct string_chars *
+allocate_string_chars_struct (struct Lisp_String *string_it_goes_with,
+			      EMACS_INT fullsize)
+{
+  struct string_chars *s_chars;
+
+  /* Allocate the string's actual data */
+  if (BIG_STRING_FULLSIZE_P (fullsize))
+    {
+      s_chars = (struct string_chars *) xmalloc (fullsize);
+    }
+  else if (fullsize <=
+           (countof (current_string_chars_block->string_chars)
+            - current_string_chars_block->pos))
+    {
+      /* This string can fit in the current string chars block */
+      s_chars = (struct string_chars *)
+	(current_string_chars_block->string_chars
+	 + current_string_chars_block->pos);
+      current_string_chars_block->pos += fullsize;
+    }
+  else
+    {
+      /* Make a new current string chars block */
+      struct string_chars_block *new 
+	= (struct string_chars_block *)
+	  xmalloc (sizeof (struct string_chars_block));
+      
+      current_string_chars_block->next = new;
+      new->prev = current_string_chars_block;
+      new->next = 0;
+      current_string_chars_block = new;
+      new->pos = fullsize;
+      s_chars = (struct string_chars *)
+	current_string_chars_block->string_chars;
+    }
+
+  s_chars->string = string_it_goes_with;
+
+  INCREMENT_CONS_COUNTER (fullsize, "string chars");
+
+  return s_chars;
+}
+
+Lisp_Object
+make_uninit_string (Bytecount length)
+{
+  struct Lisp_String *s;
+  struct string_chars *s_chars;
+  EMACS_INT fullsize = STRING_FULLSIZE (length);
+  Lisp_Object val;
+
+  if ((length < 0) || (fullsize <= 0))
+    abort ();
+
+  /* Allocate the string header */
+  ALLOCATE_FIXED_TYPE (string, struct Lisp_String, s);
+
+  s_chars = allocate_string_chars_struct (s, fullsize);
+
+  set_string_data (s, &(s_chars->chars[0]));
+  set_string_length (s, length);
+  s->plist = Qnil;
+  
+  set_string_byte (s, length, 0);
+
+  XSETSTRING (val, s);
+  return (val);
+}
+
+#ifdef VERIFY_STRING_CHARS_INTEGRITY
+static void verify_string_chars_integrity (void);
+#endif
+     
+/* Resize the string S so that DELTA bytes can be inserted starting
+   at POS.  If DELTA < 0, it means deletion starting at POS.  If
+   POS < 0, resize the string but don't copy any characters.  Use
+   this if you're planning on completely overwriting the string.
+*/
+
+void
+resize_string (struct Lisp_String *s, Bytecount pos, Bytecount delta)
+{
+#ifdef VERIFY_STRING_CHARS_INTEGRITY
+  verify_string_chars_integrity ();
+#endif
+
+#ifdef ERROR_CHECK_BUFPOS
+  if (pos >= 0)
+    {
+      assert (pos <= string_length (s));
+      if (delta < 0)
+	assert (pos + (-delta) <= string_length (s));
+    }
+  else
+    {
+      if (delta < 0)
+	assert ((-delta) <= string_length (s));
+    }
+#endif
+
+  if (pos >= 0 && delta < 0)
+  /* If DELTA < 0, the functions below will delete the characters
+     before POS.  We want to delete characters *after* POS, however,
+     so convert this to the appropriate form. */
+    pos += -delta;
+
+  if (delta == 0)
+    /* simplest case: no size change. */
+    return;
+  else
+    {
+      EMACS_INT oldfullsize = STRING_FULLSIZE (string_length (s));
+      EMACS_INT newfullsize = STRING_FULLSIZE (string_length (s) + delta);
+
+      if (oldfullsize == newfullsize)
+	{
+	  /* next simplest case; size change but the necessary
+	     allocation size won't change (up or down; code somewhere
+	     depends on there not being any unused allocation space,
+	     modulo any alignment constraints). */
+	  if (pos >= 0)
+	    {
+	      Bufbyte *addroff = pos + string_data (s);  
+
+	      memmove (addroff + delta, addroff,
+		       /* +1 due to zero-termination. */
+		       string_length (s) + 1 - pos);
+	    }
+	}
+      else if (BIG_STRING_FULLSIZE_P (oldfullsize) &&
+	       BIG_STRING_FULLSIZE_P (newfullsize))
+	{
+	  /* next simplest case; the string is big enough to be malloc()ed
+	     itself, so we just realloc.
+
+	     It's important not to let the string get below the threshold
+	     for making big strings and still remain malloc()ed; if that
+	     were the case, repeated calls to this function on the same
+	     string could result in memory leakage. */
+	  set_string_data (s, (Bufbyte *) xrealloc (string_data (s),
+						    newfullsize));
+	  if (pos >= 0)
+	    {
+	      Bufbyte *addroff = pos + string_data (s);  
+
+	      memmove (addroff + delta, addroff,
+		       /* +1 due to zero-termination. */
+		       string_length (s) + 1 - pos);
+	    }
+	}
+      else
+	{
+	  /* worst case.  We make a new string_chars struct and copy
+	     the string's data into it, inserting/deleting the delta
+	     in the process.  The old string data will either get
+	     freed by us (if it was malloc()ed) or will be reclaimed
+	     in the normal course of garbage collection. */
+	  struct string_chars *s_chars =
+	    allocate_string_chars_struct (s, newfullsize);
+	  Bufbyte *new_addr = &(s_chars->chars[0]);
+	  Bufbyte *old_addr = string_data (s);
+	  if (pos >= 0)
+	    {
+	      memcpy (new_addr, old_addr, pos);
+	      memcpy (new_addr + pos + delta, old_addr + pos,
+		      string_length (s) + 1 - pos);
+	    }
+	  set_string_data (s, new_addr);
+	  if (BIG_STRING_FULLSIZE_P (oldfullsize))
+	    xfree (old_addr);
+	  else
+	    {
+	      /* We need to mark this chunk of the string_chars_block
+		 as unused so that compact_string_chars() doesn't
+		 freak. */
+	      struct string_chars *old_s_chars =
+		(struct string_chars *) ((char *) old_addr -
+					 sizeof (struct Lisp_String *));
+	      /* Sanity check to make sure we aren't hosed by strange
+	         alignment/padding. */
+	      assert (old_s_chars->string == s);
+	      MARK_STRUCT_AS_FREE (old_s_chars);
+	      ((struct unused_string_chars *) old_s_chars)->fullsize =
+		oldfullsize;
+	    }
+	}
+
+      set_string_length (s, string_length (s) + delta);
+      /* If pos < 0, the string won't be zero-terminated.
+	 Terminate now just to make sure. */
+      string_data (s)[string_length (s)] = '\0';
+
+      if (pos >= 0)
+	{
+	  Lisp_Object string = Qnil;
+
+	  XSETSTRING (string, s);
+	  /* We also have to adjust all of the extent indices after the
+	     place we did the change.  We say "pos - 1" because
+	     adjust_extents() is exclusive of the starting position
+	     passed to it. */
+	  adjust_extents (string, pos - 1, string_length (s),
+			  delta);
+	}
+    }
+
+#ifdef VERIFY_STRING_CHARS_INTEGRITY
+  verify_string_chars_integrity ();
+#endif
+}
+
+DEFUN ("make-string", Fmake_string, Smake_string, 2, 2, 0 /*
+Return a newly created string of length LENGTH, with each element being INIT.
+LENGTH must be an integer and INIT must be a character.
+*/ )
+  (length, init)
+     Lisp_Object length, init;
+{
+  Lisp_Object val;
+
+  CHECK_NATNUM (length);
+  CHECK_CHAR_COERCE_INT (init);
+  {
+    Bufbyte str[MAX_EMCHAR_LEN];
+    int len = set_charptr_emchar (str, XCHAR (init));
+
+    val = make_uninit_string (len * XINT (length));
+    if (len == 1)
+      /* Optimize the single-byte case */
+      memset (string_data (XSTRING (val)), XCHAR (init),
+	      string_length (XSTRING (val)));
+    else
+      {
+	int i, j, k;
+	Bufbyte *ptr = string_data (XSTRING (val));
+
+	k = 0;
+	for (i = 0; i < XINT (length); i++)
+	  for (j = 0; j < len; j++)
+	    ptr[k++] = str[j];
+      }
+  }
+  return (val);
+}
+
+/* Take some raw memory, which MUST already be in internal format,
+   and package it up it into a Lisp string. */
+Lisp_Object
+make_string (CONST Bufbyte *contents, Bytecount length)
+{
+  Lisp_Object val;
+  
+  val = make_uninit_string (length);
+  memcpy (string_data (XSTRING (val)), contents, length);
+  return (val);
+}
+
+/* Take some raw memory, encoded in some external data format,
+   and convert it into a Lisp string. */
+Lisp_Object
+make_ext_string (CONST Extbyte *contents, EMACS_INT length,
+		 enum external_data_format fmt)
+{
+  CONST Bufbyte *intstr;
+  Bytecount intlen;
+
+  GET_CHARPTR_INT_DATA_ALLOCA (contents, length, fmt, intstr, intlen);
+  return make_string (intstr, intlen);
+}
+
+Lisp_Object
+build_string (CONST char *str)
+{
+  Bytecount length;
+
+  /* Some strlen crash and burn if passed null. */
+  if (!str)
+    length = 0;
+  else
+    length = strlen (str);
+
+  return make_string ((CONST Bufbyte *) str, length);
+}
+
+Lisp_Object
+build_ext_string (CONST char *str, enum external_data_format fmt)
+{
+  Bytecount length;
+
+  /* Some strlen crash and burn if passed null. */
+  if (!str)
+    length = 0;
+  else
+    length = strlen (str);
+
+  return make_ext_string ((Extbyte *) str, length, fmt);
+}
+
+Lisp_Object
+build_translated_string (CONST char *str)
+{
+  return build_string (GETTEXT (str));
+}
+
+
+/************************************************************************/
+/*                           lcrecord lists                             */
+/************************************************************************/
+
+/* Lcrecord lists are used to manage the allocation of particular
+   sorts of lcrecords, to avoid calling alloc_lcrecord() (and thus
+   malloc() and garbage-collection junk) as much as possible.
+   It is similar to the Blocktype class.
+
+   It works like this:
+
+   1) Create an lcrecord-list object using make_lcrecord_list().
+      This is often done at initialization.  Remember to staticpro
+      this object!  The arguments to make_lcrecord_list() are the
+      same as would be passed to alloc_lcrecord().
+   2) Instead of calling alloc_lcrecord(), call allocate_managed_lcrecord()
+      and pass the lcrecord-list earlier created.
+   3) When done with the lcrecord, call free_managed_lcrecord().
+      The standard freeing caveats apply: ** make sure there are no
+      pointers to the object anywhere! **
+   4) Calling free_managed_lcrecord() is just like kissing the
+      lcrecord goodbye as if it were garbage-collected.  This means:
+      -- the contents of the freed lcrecord are undefined, and the
+         contents of something produced by allocate_managed_lcrecord()
+	 are undefined, just like for alloc_lcrecord().
+      -- the mark method for the lcrecord's type will *NEVER* be called
+         on freed lcrecords.
+      -- the finalize method for the lcrecord's type will be called
+         at the time that free_managed_lcrecord() is called.
+
+   */
+
+static Lisp_Object mark_lcrecord_list (Lisp_Object, void (*) (Lisp_Object));
+DEFINE_LRECORD_IMPLEMENTATION ("lcrecord-list", lcrecord_list,
+			       mark_lcrecord_list, internal_object_printer,
+			       0, 0, 0, struct lcrecord_list);
+
+static Lisp_Object
+mark_lcrecord_list (Lisp_Object obj, void (*markobj) (Lisp_Object))
+{
+  struct lcrecord_list *list = XLCRECORD_LIST (obj);
+  Lisp_Object chain = list->free;
+
+  while (!NILP (chain))
+    {
+      struct lrecord_header *lheader = XRECORD_LHEADER (chain);
+      struct free_lcrecord_header *free_header =
+	(struct free_lcrecord_header *) lheader;
+      CONST struct lrecord_implementation *implementation
+	= lheader->implementation;
+
+#ifdef ERROR_CHECK_GC
+      /* There should be no other pointers to the free list. */
+      assert (!MARKED_RECORD_HEADER_P (lheader));
+      /* Only lcrecords should be here. */
+      assert (!implementation->basic_p);
+      /* Only free lcrecords should be here. */
+      assert (free_header->lcheader.free);
+      /* The type of the lcrecord must be right. */
+      assert (implementation == list->implementation);
+      /* So must the size. */
+      assert (implementation->static_size == 0
+	      || implementation->static_size == list->size);
+#endif
+      MARK_RECORD_HEADER (lheader);
+      chain = free_header->chain;
+    }
+      
+  return Qnil;
+}
+
+Lisp_Object
+make_lcrecord_list (int size,
+		    CONST struct lrecord_implementation *implementation)
+{
+  struct lcrecord_list *p = alloc_lcrecord (sizeof (*p),
+					    lrecord_lcrecord_list);
+  Lisp_Object val = Qnil;
+
+  p->implementation = implementation;
+  p->size = size;
+  p->free = Qnil;
+  XSETLCRECORD_LIST (val, p);
+  return val;
+}
+
+Lisp_Object
+allocate_managed_lcrecord (Lisp_Object lcrecord_list)
+{
+  struct lcrecord_list *list = XLCRECORD_LIST (lcrecord_list);
+  if (!NILP (list->free))
+    {
+      Lisp_Object val = list->free;
+      struct free_lcrecord_header *free_header =
+	(struct free_lcrecord_header *) XPNTR (val);
+
+#ifdef ERROR_CHECK_GC
+      struct lrecord_header *lheader =
+	(struct lrecord_header *) free_header;
+      CONST struct lrecord_implementation *implementation
+	= lheader->implementation;
+
+      /* There should be no other pointers to the free list. */
+      assert (!MARKED_RECORD_HEADER_P (lheader));
+      /* Only lcrecords should be here. */
+      assert (!implementation->basic_p);
+      /* Only free lcrecords should be here. */
+      assert (free_header->lcheader.free);
+      /* The type of the lcrecord must be right. */
+      assert (implementation == list->implementation);
+      /* So must the size. */
+      assert (implementation->static_size == 0
+	      || implementation->static_size == list->size);
+#endif
+      list->free = free_header->chain;
+      free_header->lcheader.free = 0;
+      return val;
+    }
+  else
+    {
+      Lisp_Object foo = Qnil;
+
+      XSETOBJ (foo, Lisp_Record,
+	       alloc_lcrecord (list->size, list->implementation));
+      return foo;
+    }
+}
+
+void
+free_managed_lcrecord (Lisp_Object lcrecord_list, Lisp_Object lcrecord)
+{
+  struct lcrecord_list *list = XLCRECORD_LIST (lcrecord_list);
+  struct free_lcrecord_header *free_header =
+    (struct free_lcrecord_header *) XPNTR (lcrecord);
+  struct lrecord_header *lheader =
+    (struct lrecord_header *) free_header;
+  CONST struct lrecord_implementation *implementation
+    = lheader->implementation;
+
+#ifdef ERROR_CHECK_GC
+  /* Make sure the size is correct.  This will catch, for example,
+     putting a window configuration on the wrong free list. */
+  if (implementation->size_in_bytes_method)
+    assert (((implementation->size_in_bytes_method) (lheader))
+	    == list->size);
+  else
+    assert (implementation->static_size == list->size);
+#endif
+
+  if (implementation->finalizer)
+    ((implementation->finalizer) (lheader, 0));
+  free_header->chain = list->free;
+  free_header->lcheader.free = 1;
+  list->free = lcrecord;
+}
+
+
+/**********************************************************************/
+/*                 Purity of essence, peace on earth                  */
+/**********************************************************************/
+
+static int symbols_initialized;
+
+Lisp_Object
+make_pure_string (CONST Bufbyte *data, Bytecount length,
+		  Lisp_Object plist, int no_need_to_copy_data)
+{
+  Lisp_Object new;
+  struct Lisp_String *s;
+  int size = (sizeof (struct Lisp_String) + ((no_need_to_copy_data) 
+                                             ? 0 
+                                             /* + 1 for terminating 0 */
+                                             : (length + 1)));
+  size = ALIGN_SIZE (size, ALIGNOF (Lisp_Object));
+
+  if (symbols_initialized && !pure_lossage)
+    {
+      /* Try to share some names.  Saves a few kbytes. */
+      Lisp_Object tem = oblookup (Vobarray, data, length);
+      if (SYMBOLP (tem))
+	{
+	  s = XSYMBOL (tem)->name;
+	  if (!PURIFIED (s)) abort ();
+	  XSETSTRING (new, s);
+	  return (new);
+	}
+    }
+
+  if (!check_purespace (size))
+    return (make_string (data, length));
+
+  s = (struct Lisp_String *) (PUREBEG + pureptr);
+  set_string_length (s, length);
+  if (no_need_to_copy_data)
+    {
+      set_string_data (s, (Bufbyte *) data);
+    }
+  else
+    {
+      set_string_data (s, (Bufbyte *) s + sizeof (struct Lisp_String));
+      memcpy (string_data (s), data, length);
+      set_string_byte (s, length, 0);
+    }
+  s->plist = Qnil;
+  pureptr += size;
+
+#ifdef PURESTAT
+  bump_purestat (&purestat_string_all, size);
+  if (purecopying_for_bytecode)
+    bump_purestat (&purestat_string_other_function, size);
+#endif
+
+  /* Do this after the official "completion" of the purecopying. */
+  s->plist = Fpurecopy (plist);
+
+  XSETSTRING (new, s);
+  return (new);
+}
+
+
+Lisp_Object
+make_pure_pname (CONST Bufbyte *data, Bytecount length,
+		 int no_need_to_copy_data)
+{
+  Lisp_Object name = make_pure_string (data, length, Qnil,
+				       no_need_to_copy_data);
+  bump_purestat (&purestat_string_pname, pure_sizeof (name));
+
+  /* We've made (at least) Qnil now, and Vobarray will soon be set up. */
+  symbols_initialized = 1;
+
+  return (name);
+}
+
+
+Lisp_Object
+pure_cons (Lisp_Object car, Lisp_Object cdr)
+{
+  Lisp_Object new;
+
+  if (!check_purespace (sizeof (struct Lisp_Cons)))
+    return (Fcons (Fpurecopy (car), Fpurecopy (cdr)));
+
+  XSETCONS (new, PUREBEG + pureptr);
+  pureptr += sizeof (struct Lisp_Cons);
+  bump_purestat (&purestat_cons, sizeof (struct Lisp_Cons));
+
+  XCAR (new) = Fpurecopy (car);
+  XCDR (new) = Fpurecopy (cdr);
+  return (new);
+}
+
+Lisp_Object
+pure_list (int nargs, Lisp_Object *args)
+{
+  Lisp_Object foo = Qnil;
+
+  for (--nargs; nargs >= 0; nargs--)
+    foo = pure_cons (args[nargs], foo);
+
+  return foo;
+}
+
+#ifdef LISP_FLOAT_TYPE
+
+Lisp_Object
+make_pure_float (double num)
+{
+  struct Lisp_Float *f;
+  Lisp_Object val;
+
+  /* Make sure that PUREBEG + pureptr is aligned on at least a sizeof
+     (double) boundary.  Some architectures (like the sparc) require
+     this, and I suspect that floats are rare enough that it's no
+     tragedy for those that don't. */
+  {
+#if defined (__GNUC__) && (__GNUC__ >= 2)
+    /* In gcc, we can directly ask what the alignment constraints of a
+       structure are, but in general, that's not possible...  Arrgh!!
+     */
+    int alignment = __alignof (struct Lisp_Float);
+#else /* !GNUC */
+    /* Best guess is to make the `double' slot be aligned to the size
+       of double (which is probably 8 bytes).  This assumes that it's
+       ok to align the beginning of the structure to the same boundary
+       that the `double' slot in it is supposed to be aligned to; this
+       should be ok because presumably there is padding in the layout
+       of the struct to account for this.
+     */
+    int alignment = sizeof (float_data (f));
+#endif
+    char *p = ((char *) PUREBEG + pureptr);
+
+    p = (char *) (((unsigned EMACS_INT) p + alignment - 1) & - alignment);
+    pureptr = p - (char *) PUREBEG;
+  }
+
+  if (!check_purespace (sizeof (struct Lisp_Float)))
+    return (make_float (num));
+
+  f = (struct Lisp_Float *) (PUREBEG + pureptr);
+  set_lheader_implementation (&(f->lheader), lrecord_float);
+  pureptr += sizeof (struct Lisp_Float);
+  bump_purestat (&purestat_float, sizeof (struct Lisp_Float));
+
+  float_next (f) = ((struct Lisp_Float *) -1);
+  float_data (f) = num;
+  XSETFLOAT (val, f);
+  return (val);
+}
+
+#endif /* LISP_FLOAT_TYPE */
+
+Lisp_Object
+make_pure_vector (EMACS_INT len, Lisp_Object init)
+{
+  Lisp_Object new;
+  EMACS_INT size = (sizeof (struct Lisp_Vector)
+              + (len - 1) * sizeof (Lisp_Object));
+
+  init = Fpurecopy (init);
+
+  if (!check_purespace (size))
+    return (make_vector (len, init));
+
+  XSETVECTOR (new, PUREBEG + pureptr);
+  pureptr += size;
+  bump_purestat (&purestat_vector_all, size);
+
+  XVECTOR (new)->size = len;
+
+  for (size = 0; size < len; size++)
+    vector_data (XVECTOR (new))[size] = init;
+
+  return (new);
+}
+
+#if 0
+/* Presently unused */
+void *
+alloc_pure_lrecord (int size, struct lrecord_implementation *implementation)
+{
+  struct lrecord_header *header = (void *) (PUREBEG + pureptr);
+
+  if (pureptr + size > PURESIZE)
+    pure_storage_exhausted ();
+
+  set_lheader_implementation (header, implementation);
+  header->next = 0;
+  return (header);
+}
+#endif
+
+
+
+DEFUN ("purecopy", Fpurecopy, Spurecopy, 1, 1, 0 /*
+Make a copy of OBJECT in pure storage.
+Recursively copies contents of vectors and cons cells.
+Does not copy symbols.
+*/ )
+     (obj)
+     Lisp_Object obj;
+{
+  int i;
+  if (!purify_flag)
+    return (obj);
+
+  if (!POINTER_TYPE_P (XTYPE (obj))
+      || PURIFIED (XPNTR (obj)))
+    return (obj);
+
+  switch (XTYPE (obj))
+    {
+    case Lisp_Cons:
+      return pure_cons (XCAR (obj), XCDR (obj));
+
+    case Lisp_String:
+      return make_pure_string (string_data (XSTRING (obj)),
+			       string_length (XSTRING (obj)),
+			       XSTRING (obj)->plist,
+                               0);
+
+    case Lisp_Vector:
+      {
+        struct Lisp_Vector *o = XVECTOR (obj);
+        Lisp_Object new = make_pure_vector (vector_length (o), Qnil);
+        for (i = 0; i < vector_length (o); i++)
+	  vector_data (XVECTOR (new))[i] = Fpurecopy (o->contents[i]);
+        return (new);
+      }
+
+    default:
+      {
+        if (COMPILED_FUNCTIONP (obj))
+          {
+            struct Lisp_Compiled_Function *o = XCOMPILED_FUNCTION (obj);
+            Lisp_Object new = make_compiled_function (1);
+            struct Lisp_Compiled_Function *n = XCOMPILED_FUNCTION (obj);
+            n->flags = o->flags;
+            n->bytecodes = Fpurecopy (o->bytecodes);
+            n->constants = Fpurecopy (o->constants);
+            n->arglist = Fpurecopy (o->arglist);
+            n->doc_and_interactive = Fpurecopy (o->doc_and_interactive);
+            return (new);
+          }
+#ifdef LISP_FLOAT_TYPE
+        else if (FLOATP (obj))
+          return make_pure_float (float_data (XFLOAT (obj)));
+#endif /* LISP_FLOAT_TYPE */
+	else if (!SYMBOLP (obj))
+          signal_simple_error ("Can't purecopy %S", obj);
+      }
+    }
+  return (obj);
+}
+
+
+
+void
+report_pure_usage (int report_impurities,
+                   int die_if_pure_storage_exceeded)
+{
+  if (pure_lossage)
+    {
+      CONST long report_round = 5000;
+
+      message ("\n****\tPure Lisp storage exhausted!\n"
+ "\tCheck whether you are loading .el files when .elc files were intended.\n"
+ "\tOtherwise, increase PURESIZE in puresize.h and relink.\n\n"
+ "\tPURESIZE is presently %ld.\n"
+ "\tAn additional %ld bytes will guarantee enough pure space;\n"
+ "\ta smaller increment may work (due to structure-sharing).\n"
+ "****",
+	       (long) PURESIZE,
+               (((pure_lossage + report_round - 1)
+                 / report_round) * report_round));
+    }
+  else
+    {
+      int lost = (PURESIZE - pureptr) / 1024;
+      char buf[200];
+
+      sprintf (buf, "Purespace usage: %ld of %ld (%d%%",
+               pureptr, (long) PURESIZE,
+               (int) (pureptr / (PURESIZE / 100.0) + 0.5));
+      if (lost > 2)
+        sprintf (buf + strlen (buf), " -- %dk wasted", lost);
+      strcat (buf, ").");
+      message ("%s", buf);
+    }
+
+#ifdef PURESTAT
+  {
+    int iii;
+
+    purestat_vector_other.nbytes =
+      purestat_vector_all.nbytes - purestat_vector_bytecode_constants.nbytes;
+    purestat_vector_other.nobjects =
+      purestat_vector_all.nobjects -
+	purestat_vector_bytecode_constants.nobjects;
+
+    purestat_string_other.nbytes =
+      purestat_string_all.nbytes - (purestat_string_pname.nbytes +
+                                    purestat_string_bytecodes.nbytes +
+                                    purestat_string_interactive.nbytes +
+                                    purestat_string_documentation.nbytes +
+#ifdef I18N3
+                                    purestat_string_domain.nbytes +
+#endif
+                                    purestat_string_other_function.nbytes);
+    purestat_string_other.nobjects =
+      purestat_string_all.nobjects - (purestat_string_pname.nobjects +
+                                      purestat_string_bytecodes.nobjects +
+                                      purestat_string_interactive.nobjects +
+                                      purestat_string_documentation.nobjects +
+#ifdef I18N3
+                                      purestat_string_domain.nobjects +
+#endif
+                                      purestat_string_other_function.nobjects);
+
+    message ("   %-24stotal:   bytes:", "");
+
+    for (iii = 0; iii < countof (purestats); iii++)
+      if (!purestats[iii])
+        clear_message ();
+      else
+        message ("   %-24s%5d  %7d  %2d%%",
+                 purestats[iii]->name,
+                 purestats[iii]->nobjects,
+                 purestats[iii]->nbytes,
+                 (int) (purestats[iii]->nbytes / (pureptr / 100.0) + 0.5));
+  }
+#endif /* PURESTAT */
+
+
+  if (report_impurities)
+    {
+      Lisp_Object tem = Felt (Fgarbage_collect (), make_int (5));
+      struct gcpro gcpro1;
+      GCPRO1 (tem);
+      message ("\nImpurities:");
+      while (!NILP (tem))
+	{
+	  if (CONSP (tem) && SYMBOLP (Fcar (tem)) && CONSP (Fcdr (tem)))
+	    {
+	      int total = XINT (Fcar (Fcdr (tem)));
+	      if (total > 0)
+		{
+		  char buf [100];
+		  char *s = buf;
+		  memcpy (buf, string_data (XSYMBOL (Fcar (tem))->name),
+			  string_length (XSYMBOL (Fcar (tem))->name) + 1);
+		  while (*s++) if (*s == '-') *s = ' ';
+		  s--; *s++ = ':'; *s = 0;
+		  message ("   %-32s%6d", buf, total);
+		}
+	      tem = Fcdr (Fcdr (tem));
+	    }
+	  else			/* WTF?! */
+	    {
+	      Fprin1 (tem, Qexternal_debugging_output);
+	      tem = Qnil;
+	    }
+	}
+      UNGCPRO;
+      garbage_collect_1 ();         /* GC garbage_collect's garbage */
+    }
+  clear_message ();
+
+  if (pure_lossage && die_if_pure_storage_exceeded)
+    fatal ("Pure storage exhausted");
+}
+
+
+/**********************************************************************/
+/*                            staticpro                               */
+/**********************************************************************/
+
+struct gcpro *gcprolist;
+
+/* 415 used Mly 29-Jun-93 */
+#define NSTATICS 1500
+/* Not "static" because of linker lossage on some systems */
+Lisp_Object *staticvec[NSTATICS]
+     /* Force it into data space! */
+     = {0};
+static int staticidx;
+
+/* Put an entry in staticvec, pointing at the variable whose address is given
+ */
+void
+staticpro (Lisp_Object *varaddress)
+{
+  if (staticidx >= countof (staticvec))
+    abort ();
+  staticvec[staticidx++] = varaddress;
+}
+
+
+/* Mark reference to a Lisp_Object.  If the object referred to has not been
+   seen yet, recursively mark all the references contained in it. */
+   
+static void
+mark_object (Lisp_Object obj)
+{
+ tail_recurse:
+
+  if (!POINTER_TYPE_P (XGCTYPE (obj)))
+    return;
+  if (PURIFIED (XPNTR (obj)))
+    return;
+  switch (XGCTYPE (obj))
+    {
+    case Lisp_Cons:
+      {
+	struct Lisp_Cons *ptr = XCONS (obj);
+	if (CONS_MARKED_P (ptr))
+	  break;
+	MARK_CONS (ptr);
+	/* If the cdr is nil, tail-recurse on the car.  */
+	if (NILP (ptr->cdr))
+	  {
+	    obj = ptr->car;
+	  }
+	else
+	  {
+	    mark_object (ptr->car);
+	    obj = ptr->cdr;
+	  }
+	goto tail_recurse;
+      }
+
+    case Lisp_Record:
+    /* case Lisp_Symbol_Value_Magic: */
+      {
+	struct lrecord_header *lheader = XRECORD_LHEADER (obj);
+	CONST struct lrecord_implementation *implementation
+	  = lheader->implementation;
+
+	if (! MARKED_RECORD_HEADER_P (lheader) &&
+	    ! UNMARKABLE_RECORD_HEADER_P (lheader))
+	  {
+	    MARK_RECORD_HEADER (lheader);
+#ifdef ERROR_CHECK_GC
+	    if (!implementation->basic_p)
+	      assert (! ((struct lcrecord_header *) lheader)->free);
+#endif
+	    if (implementation->marker != 0)
+	      {
+		obj = ((implementation->marker) (obj, mark_object));
+		if (!NILP (obj)) goto tail_recurse;
+	      }
+	  }
+      }
+      break;
+
+    case Lisp_String:
+      {
+	struct Lisp_String *ptr = XSTRING (obj);
+
+	if (!XMARKBIT (ptr->plist))
+	  {
+	    if (CONSP (ptr->plist) &&
+		EXTENT_INFOP (XCAR (ptr->plist)))
+	      flush_cached_extent_info (XCAR (ptr->plist));
+	    XMARK (ptr->plist);
+	    obj = ptr->plist;
+	    goto tail_recurse;
+	  }
+      }
+      break;
+
+    case Lisp_Vector:
+      {
+	struct Lisp_Vector *ptr = XVECTOR (obj);
+	int len = vector_length (ptr);
+	int i;
+
+	if (len < 0)
+	  break;		/* Already marked */
+	ptr->size = -1 - len;	/* Else mark it */
+	for (i = 0; i < len - 1; i++) /* and then mark its elements */
+	  mark_object (ptr->contents[i]);
+        if (len > 0)
+        {
+          obj = ptr->contents[len - 1];
+          goto tail_recurse;
+        }
+      }
+      break;
+
+#ifndef LRECORD_SYMBOL
+    case Lisp_Symbol:
+      {
+	struct Lisp_Symbol *sym = XSYMBOL (obj);
+
+	while (!XMARKBIT (sym->plist))
+	  {
+	    XMARK (sym->plist);
+	    mark_object (sym->value);
+	    mark_object (sym->function);
+	    {
+	      /*  Open-code mark_string */
+	      /*  symbol->name is a struct Lisp_String *, not a Lisp_Object */
+	      struct Lisp_String *pname = sym->name;
+	      if (!PURIFIED (pname)
+		  && !XMARKBIT (pname->plist))
+		{
+		  XMARK (pname->plist);
+		  mark_object (pname->plist);
+		}
+	    }
+	    if (!symbol_next (sym))
+	      {
+		obj = sym->plist;
+		goto tail_recurse;
+	      }
+	    mark_object (sym->plist);
+	    /* Mark the rest of the symbols in the hash-chain */
+	    sym = symbol_next (sym);
+	  }
+      }
+      break;
+#endif /* !LRECORD_SYMBOL */
+
+    default:
+      abort ();
+    }
+}
+
+/* mark all of the conses in a list and mark the final cdr; but
+   DO NOT mark the cars.
+
+   Use only for internal lists!  There should never be other pointers
+   to the cons cells, because if so, the cars will remain unmarked
+   even when they maybe should be marked. */
+void
+mark_conses_in_list (Lisp_Object obj)
+{
+  Lisp_Object rest;
+
+  for (rest = obj; CONSP (rest); rest = XCDR (rest))
+    {
+      if (CONS_MARKED_P (XCONS (rest)))
+	return;
+      MARK_CONS (XCONS (rest));
+    }
+
+  mark_object (rest);
+}
+
+
+#ifdef PURESTAT
+/* Simpler than mark-object, because pure structure can't 
+   have any circularities
+ */
+
+#if 0 /* unused */
+static int idiot_c_doesnt_have_closures;
+static void
+idiot_c (Lisp_Object obj)
+{
+  idiot_c_doesnt_have_closures += pure_sizeof (obj, 1);
+}
+#endif /* unused */
+
+/* recurse arg isn't actually used */
+static int
+pure_sizeof (Lisp_Object obj /*, int recurse */)
+{
+  int total = 0;
+
+  /*tail_recurse: */
+  if (!POINTER_TYPE_P (XTYPE (obj))
+      || !PURIFIED (XPNTR (obj)))
+    return (total);
+
+  /* symbol's sizes are accounted for separately */
+  if (SYMBOLP (obj))
+    return (total);
+
+  switch (XTYPE (obj))
+    {
+    case Lisp_String:
+      {
+	struct Lisp_String *ptr = XSTRING (obj);
+        int size = string_length (ptr);
+
+        if (string_data (ptr) !=
+	    (unsigned char *) ptr + sizeof (struct Lisp_String))
+	  {
+	    /* string-data not allocated contiguously.  
+	       Probably (better be!!) a pointer constant "C" data. */
+	    size = sizeof (struct Lisp_String);
+	  }
+        else
+	  {
+	    size = sizeof (struct Lisp_String) + size + 1;
+	    size = ALIGN_SIZE (size, sizeof (Lisp_Object));
+	  }
+        total += size;
+      }
+      break;
+
+    case Lisp_Vector:
+      {
+        struct Lisp_Vector *ptr = XVECTOR (obj);
+        int len = vector_length (ptr);
+
+        total += (sizeof (struct Lisp_Vector)
+                  + (len - 1) * sizeof (Lisp_Object));
+#if 0 /* unused */
+        if (!recurse)
+          break;
+        { 
+          int i;
+	  for (i = 0; i < len - 1; i++)
+	    total += pure_sizeof (ptr->contents[i], 1);
+	}
+        if (len > 0)
+	  {
+	    obj = ptr->contents[len - 1];
+	    goto tail_recurse;
+	  }
+#endif /* unused */
+      }
+      break;
+
+    case Lisp_Record:
+      {
+	struct lrecord_header *lheader = XRECORD_LHEADER (obj);
+	CONST struct lrecord_implementation *implementation
+	  = lheader->implementation;
+
+        if (implementation->size_in_bytes_method)
+          total += ((implementation->size_in_bytes_method) (lheader));
+	else
+          total += implementation->static_size;
+
+#if 0 /* unused */
+        if (!recurse)
+          break;
+
+	if (implementation->marker != 0)
+	  {
+	    int old = idiot_c_doesnt_have_closures;
+
+	    idiot_c_doesnt_have_closures = 0;
+	    obj = ((implementation->marker) (obj, idiot_c));
+	    total += idiot_c_doesnt_have_closures;
+	    idiot_c_doesnt_have_closures = old;
+            
+	    if (!NILP (obj)) goto tail_recurse;
+	  }
+#endif /* unused */
+      }
+      break;
+
+    case Lisp_Cons:
+      {
+        struct Lisp_Cons *ptr = XCONS (obj);
+        total += sizeof (*ptr);
+#if 0 /* unused */
+        if (!recurse)
+          break;
+	/* If the cdr is nil, tail-recurse on the car.  */
+	if (NILP (ptr->cdr))
+	  {
+	    obj = ptr->car;
+	  }
+	else
+	  {
+	    total += pure_sizeof (ptr->car, 1);
+	    obj = ptr->cdr;
+	  }
+	goto tail_recurse;
+#endif /* unused */
+      }
+      break;
+
+      /* Others can't be purified */
+    default:
+      abort ();
+    }
+  return (total);
+}
+#endif /* PURESTAT */
+
+
+
+
+/* Find all structures not marked, and free them. */
+
+static int gc_count_num_vector_used, gc_count_vector_total_size;
+static int gc_count_vector_storage;
+static int gc_count_num_bit_vector_used, gc_count_bit_vector_total_size;
+static int gc_count_bit_vector_storage;
+static int gc_count_num_short_string_in_use;
+static int gc_count_string_total_size;
+static int gc_count_short_string_total_size;
+
+/* static int gc_count_total_records_used, gc_count_records_total_size; */
+
+
+/* This will be used more extensively In The Future */
+static int last_lrecord_type_index_assigned;
+
+static CONST struct lrecord_implementation *lrecord_implementations_table[128];
+#define max_lrecord_type (countof (lrecord_implementations_table) - 1)
+
+static int
+lrecord_type_index (CONST struct lrecord_implementation *implementation)
+{
+  int type_index = *(implementation->lrecord_type_index);
+  /* Have to do this circuitous and validation test because of problems
+     dumping out initialized variables (ie can't set xxx_type_index to -1
+     because that would make xxx_type_index read-only in a dumped emacs. */
+  if (type_index < 0 || type_index > max_lrecord_type
+      || lrecord_implementations_table[type_index] != implementation)
+    {
+      if (last_lrecord_type_index_assigned == max_lrecord_type)
+        abort ();
+      type_index = ++last_lrecord_type_index_assigned;
+      lrecord_implementations_table[type_index] = implementation;
+      *(implementation->lrecord_type_index) = type_index;
+    }
+  return (type_index);
+}
+
+/* stats on lcrecords in use - kinda kludgy */
+
+static struct
+{
+  int instances_in_use;
+  int bytes_in_use;
+  int instances_freed;
+  int bytes_freed;
+  int instances_on_free_list;
+} lcrecord_stats [countof (lrecord_implementations_table)];
+
+
+static void
+reset_lcrecord_stats (void)
+{
+  int i;
+  for (i = 0; i < countof (lcrecord_stats); i++)
+    {
+      lcrecord_stats[i].instances_in_use = 0;
+      lcrecord_stats[i].bytes_in_use = 0;
+      lcrecord_stats[i].instances_freed = 0;
+      lcrecord_stats[i].bytes_freed = 0;
+      lcrecord_stats[i].instances_on_free_list = 0;
+    }
+}
+
+static void
+tick_lcrecord_stats (CONST struct lrecord_header *h, int free_p)
+{
+  CONST struct lrecord_implementation *implementation = h->implementation;
+  int type_index = lrecord_type_index (implementation);
+
+  if (((struct lcrecord_header *) h)->free)
+    {
+      assert (!free_p);
+      lcrecord_stats[type_index].instances_on_free_list++;
+    }
+  else
+    {
+      unsigned int sz = (implementation->size_in_bytes_method
+			 ? ((implementation->size_in_bytes_method) (h))
+			 : implementation->static_size);
+
+      if (free_p)
+	{
+	  lcrecord_stats[type_index].instances_freed++;
+	  lcrecord_stats[type_index].bytes_freed += sz;
+	}
+      else
+	{
+	  lcrecord_stats[type_index].instances_in_use++;
+	  lcrecord_stats[type_index].bytes_in_use += sz;
+	}
+    }
+}
+
+
+/* Free all unmarked records */
+static void
+sweep_lcrecords_1 (struct lcrecord_header **prev, int *used)
+{
+  struct lcrecord_header *header;
+  int num_used = 0;
+  /* int total_size = 0; */
+  reset_lcrecord_stats ();
+
+  /* First go through and call all the finalize methods.
+     Then go through and free the objects.  There used to
+     be only one loop here, with the call to the finalizer
+     occurring directly before the xfree() below.  That
+     is marginally faster but much less safe -- if the
+     finalize method for an object needs to reference any
+     other objects contained within it (and many do),
+     we could easily be screwed by having already freed that
+     other object. */
+
+  for (header = *prev; header; header = header->next)
+    {
+      struct lrecord_header *h = &(header->lheader);
+      if (!MARKED_RECORD_HEADER_P (h) && ! (header->free))
+	{
+	  if (h->implementation->finalizer)
+	    ((h->implementation->finalizer) (h, 0));
+	}
+    }
+
+  for (header = *prev; header; )
+    {
+      struct lrecord_header *h = &(header->lheader);
+      if (MARKED_RECORD_HEADER_P (h))
+	{
+	  UNMARK_RECORD_HEADER (h);
+	  num_used++;
+	  /* total_size += ((n->implementation->size_in_bytes) (h));*/
+	  prev = &(header->next);
+	  header = *prev;
+	  tick_lcrecord_stats (h, 0);
+	}
+      else
+	{
+	  struct lcrecord_header *next = header->next;
+          *prev = next;
+	  tick_lcrecord_stats (h, 1);
+	  /* used to call finalizer right here. */
+	  xfree (header);
+	  header = next;
+	}
+    }
+  *used = num_used;
+  /* *total = total_size; */
+}
+
+static void
+sweep_vectors_1 (Lisp_Object *prev, 
+                 int *used, int *total, int *storage)
+{
+  Lisp_Object vector;
+  int num_used = 0;
+  int total_size = 0;
+  int total_storage = 0;
+
+  for (vector = *prev; VECTORP (vector); )
+    {
+      struct Lisp_Vector *v = XVECTOR (vector);
+      int len = v->size;
+      if (len < 0)     /* marked */
+	{
+          len = - (len + 1);
+	  v->size = len;
+	  total_size += len;
+          total_storage += (MALLOC_OVERHEAD
+                            + sizeof (struct Lisp_Vector)
+                            + (len - 1 + 1) * sizeof (Lisp_Object));
+	  num_used++;
+	  prev = &(vector_next (v));
+	  vector = *prev;
+	}
+      else
+	{
+          Lisp_Object next = vector_next (v);
+          *prev = next;
+	  xfree (v);
+	  vector = next;
+	}
+    }
+  *used = num_used;
+  *total = total_size;
+  *storage = total_storage;
+}
+
+static void
+sweep_bit_vectors_1 (Lisp_Object *prev, 
+		     int *used, int *total, int *storage)
+{
+  Lisp_Object bit_vector;
+  int num_used = 0;
+  int total_size = 0;
+  int total_storage = 0;
+
+  /* BIT_VECTORP fails because the objects are marked, which changes
+     their implementation */
+  for (bit_vector = *prev; !EQ (bit_vector, Qzero); )
+    {
+      struct Lisp_Bit_Vector *v = XBIT_VECTOR (bit_vector);
+      int len = v->size;
+      if (MARKED_RECORD_P (bit_vector))
+	{
+	  UNMARK_RECORD_HEADER (&(v->lheader));
+	  total_size += len;
+          total_storage += (MALLOC_OVERHEAD
+                            + sizeof (struct Lisp_Bit_Vector)
+                            + (BIT_VECTOR_LONG_STORAGE (len) - 1)
+			    * sizeof (long));
+	  num_used++;
+	  prev = &(bit_vector_next (v));
+	  bit_vector = *prev;
+	}
+      else
+	{
+          Lisp_Object next = bit_vector_next (v);
+          *prev = next;
+	  xfree (v);
+	  bit_vector = next;
+	}
+    }
+  *used = num_used;
+  *total = total_size;
+  *storage = total_storage;
+}
+
+/* And the Lord said: Thou shalt use the `c-backslash-region' command
+   to make macros prettier. */
+
+#ifdef ERROR_CHECK_GC
+
+#define SWEEP_FIXED_TYPE_BLOCK(typename, obj_type)			\
+do {									\
+  struct typename##_block *_frob_current;				\
+  struct typename##_block **_frob_prev;					\
+  int _frob_limit;							\
+  int num_free = 0, num_used = 0;					\
+									\
+  for (_frob_prev = &current_##typename##_block,			\
+       _frob_current = current_##typename##_block,			\
+       _frob_limit = current_##typename##_block_index;			\
+       _frob_current;							\
+       )								\
+    {									\
+      int _frob_iii;							\
+									\
+      for (_frob_iii = 0; _frob_iii < _frob_limit; _frob_iii++)		\
+	{								\
+	  obj_type *_frob_victim = &(_frob_current->block[_frob_iii]);	\
+									\
+	  if (FREE_STRUCT_P (_frob_victim))				\
+	    {								\
+	      num_free++;						\
+	    }								\
+	  else if (!MARKED_##typename##_P (_frob_victim))		\
+	    {								\
+	      num_free++;						\
+	      FREE_FIXED_TYPE (typename, obj_type, _frob_victim);	\
+	    }								\
+	  else								\
+	    {								\
+	      num_used++;						\
+	      UNMARK_##typename (_frob_victim);				\
+	    }								\
+	}								\
+      _frob_prev = &(_frob_current->prev);				\
+      _frob_current = _frob_current->prev;				\
+      _frob_limit = countof (current_##typename##_block->block);	\
+    }									\
+									\
+  gc_count_num_##typename##_in_use = num_used;				\
+  gc_count_num_##typename##_freelist = num_free;			\
+} while (0)
+
+#else
+
+#define SWEEP_FIXED_TYPE_BLOCK(typename, obj_type)			      \
+do {									      \
+  struct typename##_block *_frob_current;				      \
+  struct typename##_block **_frob_prev;					      \
+  int _frob_limit;							      \
+  int num_free = 0, num_used = 0;					      \
+									      \
+  typename##_free_list = 0;						      \
+									      \
+  for (_frob_prev = &current_##typename##_block,			      \
+       _frob_current = current_##typename##_block,			      \
+       _frob_limit = current_##typename##_block_index;			      \
+       _frob_current;							      \
+       )								      \
+    {									      \
+      int _frob_iii;							      \
+      int _frob_empty = 1;						      \
+      obj_type *_frob_old_free_list = typename##_free_list;		      \
+									      \
+      for (_frob_iii = 0; _frob_iii < _frob_limit; _frob_iii++)		      \
+	{								      \
+	  obj_type *_frob_victim = &(_frob_current->block[_frob_iii]);	      \
+									      \
+	  if (FREE_STRUCT_P (_frob_victim))				      \
+	    {								      \
+	      num_free++;						      \
+	      PUT_FIXED_TYPE_ON_FREE_LIST (typename, obj_type, _frob_victim); \
+	    }								      \
+	  else if (!MARKED_##typename##_P (_frob_victim))		      \
+	    {								      \
+	      num_free++;						      \
+	      FREE_FIXED_TYPE (typename, obj_type, _frob_victim);	      \
+	    }								      \
+	  else								      \
+	    {								      \
+	      _frob_empty = 0;						      \
+	      num_used++;						      \
+	      UNMARK_##typename (_frob_victim);				      \
+	    }								      \
+	}								      \
+      if (!_frob_empty)							      \
+	{								      \
+	  _frob_prev = &(_frob_current->prev);				      \
+	  _frob_current = _frob_current->prev;				      \
+	}								      \
+      else if (_frob_current == current_##typename##_block		      \
+	       && !_frob_current->prev)					      \
+	{								      \
+	  /* No real point in freeing sole allocation block */		      \
+	  break;							      \
+	}								      \
+      else								      \
+	{								      \
+	  struct typename##_block *_frob_victim_block = _frob_current;	      \
+	  if (_frob_victim_block == current_##typename##_block)		      \
+	    current_##typename##_block_index				      \
+	      = countof (current_##typename##_block->block);		      \
+	  _frob_current = _frob_current->prev;				      \
+	  {								      \
+	    *_frob_prev = _frob_current;				      \
+	    xfree (_frob_victim_block);					      \
+	    /* Restore free list to what it was before victim was swept */    \
+	    typename##_free_list = _frob_old_free_list;			      \
+	    num_free -= _frob_limit;					      \
+	  }								      \
+	}								      \
+      _frob_limit = countof (current_##typename##_block->block);	      \
+    }									      \
+									      \
+  gc_count_num_##typename##_in_use = num_used;				      \
+  gc_count_num_##typename##_freelist = num_free;			      \
+} while (0)
+
+#endif
+
+
+
+
+static void
+sweep_conses (void)
+{
+#define MARKED_cons_P(ptr) XMARKBIT ((ptr)->car)
+#define UNMARK_cons(ptr) do { XUNMARK ((ptr)->car); } while (0)
+#define ADDITIONAL_FREE_cons(ptr)
+
+  SWEEP_FIXED_TYPE_BLOCK (cons, struct Lisp_Cons);
+}
+
+/* Explicitly free a cons cell.  */
+void
+free_cons (struct Lisp_Cons *ptr)
+{
+#ifdef ERROR_CHECK_GC
+  /* If the CAR is not an int, then it will be a pointer, which will
+     always be four-byte aligned.  If this cons cell has already been
+     placed on the free list, however, its car will probably contain
+     a chain pointer to the next cons on the list, which has cleverly
+     had all its 0's and 1's inverted.  This allows for a quick
+     check to make sure we're not freeing something already freed. */
+  if (POINTER_TYPE_P (XTYPE (ptr->car)))
+    ASSERT_VALID_POINTER (XPNTR (ptr->car));
+#endif
+#ifndef ALLOC_NO_POOLS
+  FREE_FIXED_TYPE_WHEN_NOT_IN_GC (cons, struct Lisp_Cons, ptr);
+#endif /* ALLOC_NO_POOLS */
+}
+
+/* explicitly free a list.  You **must make sure** that you have
+   created all the cons cells that make up this list and that there
+   are no pointers to any of these cons cells anywhere else.  If there
+   are, you will lose. */
+
+void
+free_list (Lisp_Object list)
+{
+  Lisp_Object rest, next;
+
+  for (rest = list; !NILP (rest); rest = next)
+    {
+      next = XCDR (rest);
+      free_cons (XCONS (rest));
+    }
+}
+
+/* explicitly free an alist.  You **must make sure** that you have
+   created all the cons cells that make up this alist and that there
+   are no pointers to any of these cons cells anywhere else.  If there
+   are, you will lose. */
+
+void
+free_alist (Lisp_Object alist)
+{
+  Lisp_Object rest, next;
+
+  for (rest = alist; !NILP (rest); rest = next)
+    {
+      next = XCDR (rest);
+      free_cons (XCONS (XCAR (rest)));
+      free_cons (XCONS (rest));
+    }
+}
+
+static void
+sweep_compiled_functions (void)
+{
+#define MARKED_compiled_function_P(ptr) \
+  MARKED_RECORD_HEADER_P (&((ptr)->lheader))
+#define UNMARK_compiled_function(ptr) UNMARK_RECORD_HEADER (&((ptr)->lheader))
+#define ADDITIONAL_FREE_compiled_function(ptr)
+
+  SWEEP_FIXED_TYPE_BLOCK (compiled_function, struct Lisp_Compiled_Function);
+}
+
+
+#ifdef LISP_FLOAT_TYPE
+static void
+sweep_floats (void)
+{
+#define MARKED_float_P(ptr) MARKED_RECORD_HEADER_P (&((ptr)->lheader))
+#define UNMARK_float(ptr) UNMARK_RECORD_HEADER (&((ptr)->lheader))
+#define ADDITIONAL_FREE_float(ptr)
+
+  SWEEP_FIXED_TYPE_BLOCK (float, struct Lisp_Float);
+}
+#endif /* LISP_FLOAT_TYPE */
+
+static void
+sweep_symbols (void)
+{
+#ifndef LRECORD_SYMBOL
+# define MARKED_symbol_P(ptr) XMARKBIT ((ptr)->plist)
+# define UNMARK_symbol(ptr) do { XUNMARK ((ptr)->plist); } while (0)
+#else
+# define MARKED_symbol_P(ptr) MARKED_RECORD_HEADER_P (&((ptr)->lheader))
+# define UNMARK_symbol(ptr) UNMARK_RECORD_HEADER (&((ptr)->lheader))
+#endif /* !LRECORD_SYMBOL */
+#define ADDITIONAL_FREE_symbol(ptr)
+
+  SWEEP_FIXED_TYPE_BLOCK (symbol, struct Lisp_Symbol);
+}
+
+
+#ifndef standalone
+
+static void
+sweep_extents (void)
+{
+#define MARKED_extent_P(ptr) MARKED_RECORD_HEADER_P (&((ptr)->lheader))
+#define UNMARK_extent(ptr) UNMARK_RECORD_HEADER (&((ptr)->lheader))
+#define ADDITIONAL_FREE_extent(ptr)
+
+  SWEEP_FIXED_TYPE_BLOCK (extent, struct extent);
+}
+
+static void
+sweep_events (void)
+{
+#define MARKED_event_P(ptr) MARKED_RECORD_HEADER_P (&((ptr)->lheader))
+#define UNMARK_event(ptr) UNMARK_RECORD_HEADER (&((ptr)->lheader))
+#define ADDITIONAL_FREE_event(ptr)
+
+  SWEEP_FIXED_TYPE_BLOCK (event, struct Lisp_Event);
+}
+
+static void
+sweep_markers (void)
+{
+#define MARKED_marker_P(ptr) MARKED_RECORD_HEADER_P (&((ptr)->lheader))
+#define UNMARK_marker(ptr) UNMARK_RECORD_HEADER (&((ptr)->lheader))
+#define ADDITIONAL_FREE_marker(ptr)					\
+  do { Lisp_Object tem;							\
+       XSETMARKER (tem, ptr);						\
+       unchain_marker (tem);						\
+     } while (0)
+
+  SWEEP_FIXED_TYPE_BLOCK (marker, struct Lisp_Marker);
+}
+
+/* Explicitly free a marker.  */
+void
+free_marker (struct Lisp_Marker *ptr)
+{
+#ifdef ERROR_CHECK_GC
+  /* Perhaps this will catch freeing an already-freed marker. */
+  Lisp_Object temmy;
+  XSETMARKER (temmy, ptr);
+  assert (GC_MARKERP (temmy));
+#endif
+#ifndef ALLOC_NO_POOLS
+  FREE_FIXED_TYPE_WHEN_NOT_IN_GC (marker, struct Lisp_Marker, ptr);
+#endif /* ALLOC_NO_POOLS */
+}
+
+#endif /* not standalone */
+
+
+/* Compactify string chars, relocating the reference to each --
+   free any empty string_chars_block we see. */
+static void
+compact_string_chars (void)
+{
+  struct string_chars_block *to_sb = first_string_chars_block;
+  int to_pos = 0;
+  struct string_chars_block *from_sb;
+
+  /* Scan each existing string block sequentially, string by string.  */
+  for (from_sb = first_string_chars_block; from_sb; from_sb = from_sb->next)
+    {
+      int from_pos = 0;
+      /* FROM_POS is the index of the next string in the block.  */
+      while (from_pos < from_sb->pos)
+        {
+          struct string_chars *from_s_chars = 
+            (struct string_chars *) &(from_sb->string_chars[from_pos]);
+          struct string_chars *to_s_chars;
+          struct Lisp_String *string;
+	  int size;
+	  int fullsize;
+
+	  /* If the string_chars struct is marked as free (i.e. the STRING
+	     pointer is 0xFFFFFFFF) then this is an unused chunk of string
+             storage.  This happens under Mule when a string's size changes
+	     in such a way that its fullsize changes. (Strings can change
+	     size because a different-length character can be substituted
+	     for another character.) In this case, after the bogus string
+	     pointer is the "fullsize" of this entry, i.e. how many bytes
+	     to skip. */
+
+	  if (FREE_STRUCT_P (from_s_chars))
+	    {
+	      fullsize = ((struct unused_string_chars *) from_s_chars)->fullsize;
+	      from_pos += fullsize;
+	      continue;
+            }
+
+          string = from_s_chars->string;
+	  assert (!(FREE_STRUCT_P (string)));
+
+          size = string_length (string);
+          fullsize = STRING_FULLSIZE (size);
+
+          if (BIG_STRING_FULLSIZE_P (fullsize))
+            abort ();
+
+          /* Just skip it if it isn't marked.  */
+          if (!XMARKBIT (string->plist))
+            {
+              from_pos += fullsize;
+              continue;
+            }
+
+          /* If it won't fit in what's left of TO_SB, close TO_SB out
+             and go on to the next string_chars_block.  We know that TO_SB
+             cannot advance past FROM_SB here since FROM_SB is large enough
+             to currently contain this string. */
+          if ((to_pos + fullsize) > countof (to_sb->string_chars))
+            {
+              to_sb->pos = to_pos;
+              to_sb = to_sb->next;
+              to_pos = 0;
+            }
+             
+          /* Compute new address of this string
+             and update TO_POS for the space being used.  */
+          to_s_chars = (struct string_chars *) &(to_sb->string_chars[to_pos]);
+
+          /* Copy the string_chars to the new place.  */
+          if (from_s_chars != to_s_chars)
+            memmove (to_s_chars, from_s_chars, fullsize);
+
+          /* Relocate FROM_S_CHARS's reference */
+          set_string_data (string, &(to_s_chars->chars[0]));
+             
+          from_pos += fullsize;
+          to_pos += fullsize;
+        }
+    }
+
+  /* Set current to the last string chars block still used and 
+     free any that follow. */
+  {
+    struct string_chars_block *victim;
+
+    for (victim = to_sb->next; victim; )
+      {
+	struct string_chars_block *next = victim->next;
+	xfree (victim);
+	victim = next;
+      }
+
+    current_string_chars_block = to_sb;
+    current_string_chars_block->pos = to_pos;
+    current_string_chars_block->next = 0;
+  }
+}
+
+#if 1 /* Hack to debug missing purecopy's */
+static int debug_string_purity;
+
+static void
+debug_string_purity_print (struct Lisp_String *p)
+{
+  Charcount i;
+  Charcount s = string_char_length (p);
+  putc ('\"', stderr);
+  for (i = 0; i < s; i++)
+  {
+    Emchar ch = string_char (p, i);
+    if (ch < 32 || ch >= 126)
+      stderr_out ("\\%03o", ch);
+    else if (ch == '\\' || ch == '\"')
+      stderr_out ("\\%c", ch);
+    else
+      stderr_out ("%c", ch);
+  }
+  stderr_out ("\"\n");
+}
+#endif
+
+
+static void
+sweep_strings (void)
+{
+  int num_small_used = 0, num_small_bytes = 0, num_bytes = 0;
+  int debug = debug_string_purity;
+
+#define MARKED_string_P(ptr) XMARKBIT ((ptr)->plist)
+#define UNMARK_string(ptr)				\
+  do { struct Lisp_String *p = (ptr);			\
+       int size = string_length (p);			\
+       XUNMARK (p->plist);				\
+       num_bytes += size;				\
+       if (!BIG_STRING_SIZE_P (size))			\
+	 { num_small_bytes += size;			\
+	   num_small_used++;				\
+	 }						\
+       if (debug) debug_string_purity_print (p);	\
+     } while (0)
+#define ADDITIONAL_FREE_string(p)				\
+  do { int size = string_length (p);				\
+       if (BIG_STRING_SIZE_P (size))				\
+	 xfree_1 (CHARS_TO_STRING_CHAR (string_data (p)));	\
+     } while (0)
+
+  SWEEP_FIXED_TYPE_BLOCK (string, struct Lisp_String);
+
+  gc_count_num_short_string_in_use = num_small_used;
+  gc_count_string_total_size = num_bytes;
+  gc_count_short_string_total_size = num_small_bytes;
+}
+
+
+/* I hate duplicating all this crap! */
+static int
+marked_p (Lisp_Object obj)
+{
+  if (!POINTER_TYPE_P (XGCTYPE (obj))) return 1;
+  if (PURIFIED (XPNTR (obj))) return 1;
+  switch (XGCTYPE (obj))
+    {
+    case Lisp_Cons:
+      return XMARKBIT (XCAR (obj));
+    case Lisp_Record:
+      return MARKED_RECORD_HEADER_P (XRECORD_LHEADER (obj));
+    case Lisp_String:
+      return XMARKBIT (XSTRING (obj)->plist);
+    case Lisp_Vector:
+      return (vector_length (XVECTOR (obj)) < 0);
+#ifndef LRECORD_SYMBOL
+    case Lisp_Symbol:
+      return XMARKBIT (XSYMBOL (obj)->plist);
+#endif
+    default:
+      abort ();
+    }
+  return 0;	/* suppress compiler warning */
+}
+
+static void
+gc_sweep (void)
+{
+  /* Free all unmarked records.  Do this at the very beginning,
+     before anything else, so that the finalize methods can safely
+     examine items in the objects.  sweep_lcrecords_1() makes
+     sure to call all the finalize methods *before* freeing anything,
+     to complete the safety. */
+  {
+    int ignored;
+    sweep_lcrecords_1 (&all_lcrecords, &ignored);
+  }
+
+  compact_string_chars ();
+
+  /* Finalize methods below (called through the ADDITIONAL_FREE_foo
+     macros) must be *extremely* careful to make sure they're not
+     referencing freed objects.  The only two existing finalize
+     methods (for strings and markers) pass muster -- the string
+     finalizer doesn't look at anything but its own specially-
+     created block, and the marker finalizer only looks at live
+     buffers (which will never be freed) and at the markers before
+     and after it in the chain (which, by induction, will never be
+     freed because if so, they would have already removed themselves
+     from the chain). */
+
+  /* Put all unmarked strings on free list, free'ing the string chars
+     of large unmarked strings */
+  sweep_strings ();
+
+  /* Put all unmarked conses on free list */
+  sweep_conses ();
+
+  /* Free all unmarked vectors */
+  sweep_vectors_1 (&all_vectors,
+                   &gc_count_num_vector_used, &gc_count_vector_total_size,
+                   &gc_count_vector_storage);
+
+  /* Free all unmarked bit vectors */
+  sweep_bit_vectors_1 (&all_bit_vectors,
+		       &gc_count_num_bit_vector_used,
+		       &gc_count_bit_vector_total_size,
+		       &gc_count_bit_vector_storage);
+
+  /* Free all unmarked compiled-function objects */
+  sweep_compiled_functions ();
+
+#ifdef LISP_FLOAT_TYPE
+  /* Put all unmarked floats on free list */
+  sweep_floats ();
+#endif
+
+  /* Put all unmarked symbols on free list */
+  sweep_symbols ();
+
+  /* Put all unmarked extents on free list */
+  sweep_extents ();
+
+  /* Put all unmarked markers on free list.
+     Dechain each one first from the buffer into which it points. */
+  sweep_markers ();
+
+  sweep_events ();
+
+}
+
+/* Clearing for disksave. */
+
+extern Lisp_Object Vprocess_environment;
+extern Lisp_Object Vdoc_directory;
+extern Lisp_Object Vconfigure_info_directory;
+extern Lisp_Object Vload_path;
+extern Lisp_Object Vload_history;
+extern Lisp_Object Vshell_file_name;
+
+void
+disksave_object_finalization (void)
+{
+  /* It's important that certain information from the environment not get
+     dumped with the executable (pathnames, environment variables, etc.).
+     To make it easier to tell when this has happend with strings(1) we
+     clear some known-to-be-garbage blocks of memory, so that leftover
+     results of old evaluation don't look like potential problems.
+     But first we set some notable variables to nil and do one more GC,
+     to turn those strings into garbage.
+   */
+
+  /* Yeah, this list is pretty ad-hoc... */
+  Vprocess_environment = Qnil;
+  Vexec_directory = Qnil;
+  Vdata_directory = Qnil;
+  Vdoc_directory = Qnil;
+  Vconfigure_info_directory = Qnil;
+  Vexec_path = Qnil;
+  Vload_path = Qnil;
+  /* Vdump_load_path = Qnil; */
+  Vload_history = Qnil;
+  Vshell_file_name = Qnil;
+
+  garbage_collect_1 ();
+
+  /* Run the disksave finalization methods of all live objects. */
+  disksave_object_finalization_1 ();
+
+  /* Zero out the unused portion of purespace */
+  if (!pure_lossage)
+    memset (  (char *) (PUREBEG + pureptr), 0,
+	    (((char *) (PUREBEG + PURESIZE)) -
+	     ((char *) (PUREBEG + pureptr))));
+
+  /* Zero out the uninitialized (really, unused) part of the containers
+     for the live strings. */
+  {
+    struct string_chars_block *scb;
+    for (scb = first_string_chars_block; scb; scb = scb->next)
+      /* from the block's fill ptr to the end */
+      memset ((scb->string_chars + scb->pos), 0,
+              sizeof (scb->string_chars) - scb->pos);
+  }
+
+  /* There, that ought to be enough... */
+
+}
+
+
+Lisp_Object
+restore_gc_inhibit (Lisp_Object val)
+{
+  gc_currently_forbidden = XINT (val);
+  return val;
+}
+
+/* Maybe we want to use this when doing a "panic" gc after memory_full()? */
+static int gc_hooks_inhibited;
+
+
+void
+garbage_collect_1 (void)
+{
+  char stack_top_variable;
+  extern char *stack_bottom;
+  int i;
+  struct frame *f = selected_frame ();
+  int speccount = specpdl_depth ();
+  Lisp_Object pre_gc_cursor = Qnil;
+  struct gcpro gcpro1;
+
+  int cursor_changed = 0;
+
+  if (gc_in_progress != 0)
+    return;
+
+  if (gc_currently_forbidden || in_display)
+    return;
+
+  if (preparing_for_armageddon)
+    return;
+
+  GCPRO1 (pre_gc_cursor);
+
+  /* Very important to prevent GC during any of the following
+     stuff that might run Lisp code; otherwise, we'll likely
+     have infinite GC recursion. */
+  record_unwind_protect (restore_gc_inhibit,
+                         make_int (gc_currently_forbidden));
+  gc_currently_forbidden = 1;
+
+  if (!gc_hooks_inhibited)
+    run_hook_trapping_errors ("Error in pre-gc-hook", Qpre_gc_hook);
+
+  /* Now show the GC cursor/message. */
+  if (!noninteractive)
+    {
+      if (FRAME_WIN_P (f))
+	{
+	  Lisp_Object frame = make_frame (f);
+	  Lisp_Object cursor = glyph_image_instance (Vgc_pointer_glyph,
+						     FRAME_SELECTED_WINDOW (f),
+						     ERROR_ME_NOT, 1);
+	  pre_gc_cursor = f->pointer;
+	  if (POINTER_IMAGE_INSTANCEP (cursor)
+	      /* don't change if we don't know how to change back. */
+	      && POINTER_IMAGE_INSTANCEP (pre_gc_cursor))
+	    {
+	      cursor_changed = 1;
+	      Fset_frame_pointer (frame, cursor);
+	    }
+	}
+
+      /* Don't print messages to the stream device. */
+      if (!cursor_changed && !FRAME_STREAM_P (f))
+	{
+	  char *msg = (STRINGP (Vgc_message)
+		       ? GETTEXT ((char *) string_data (XSTRING (Vgc_message)))
+		       : 0);
+	  Lisp_Object args[2], whole_msg;
+	  args[0] = build_string (msg ? msg :
+				  GETTEXT ((CONST char *) gc_default_message));
+	  args[1] = build_string ("...");
+	  whole_msg = Fconcat (2, args);
+	  echo_area_message (f, (Bufbyte *) 0, whole_msg, 0, -1,
+			     Qgarbage_collecting);
+	}
+    }
+
+  /***** Now we actually start the garbage collection. */
+
+  gc_in_progress = 1;
+
+  gc_generation_number[0]++;
+
+#if MAX_SAVE_STACK > 0
+
+  /* Save a copy of the contents of the stack, for debugging.  */
+  if (!purify_flag)
+    {
+      i = &stack_top_variable - stack_bottom;
+      if (i < 0) i = -i;
+      if (i < MAX_SAVE_STACK)
+	{
+	  if (stack_copy == 0)
+	    stack_copy = (char *) malloc (stack_copy_size = i);
+	  else if (stack_copy_size < i)
+	    stack_copy = (char *) realloc (stack_copy, (stack_copy_size = i));
+	  if (stack_copy)
+	    {
+	      if ((int) (&stack_top_variable - stack_bottom) > 0)
+		memcpy (stack_copy, stack_bottom, i);
+	      else
+		memcpy (stack_copy, &stack_top_variable, i);
+	    }
+	}
+    }
+#endif /* MAX_SAVE_STACK > 0 */
+
+  /* Do some totally ad-hoc resource clearing. */
+  /* #### generalize this? */
+  clear_event_resource ();
+  cleanup_specifiers ();
+
+  /* Mark all the special slots that serve as the roots of accessibility. */
+  {
+    struct gcpro *tail;
+    struct catchtag *catch;
+    struct backtrace *backlist;
+    struct specbinding *bind;
+
+    for (i = 0; i < staticidx; i++)
+      {
+#ifdef GDB_SUCKS
+	printf ("%d\n", i);
+	debug_print (*staticvec[i]);
+#endif
+        mark_object (*(staticvec[i]));
+      }
+
+    for (tail = gcprolist; tail; tail = tail->next)
+      {
+	for (i = 0; i < tail->nvars; i++)
+	  mark_object (tail->var[i]);
+      }
+
+    for (bind = specpdl; bind != specpdl_ptr; bind++)
+      {
+	mark_object (bind->symbol);
+	mark_object (bind->old_value);
+      }
+
+    for (catch = catchlist; catch; catch = catch->next)
+      {
+	mark_object (catch->tag);
+	mark_object (catch->val);
+      }
+
+    for (backlist = backtrace_list; backlist; backlist = backlist->next)
+      {
+	int nargs = backlist->nargs;
+
+	mark_object (*backlist->function);
+	if (nargs == UNEVALLED || nargs == MANY)
+	  mark_object (backlist->args[0]);
+	else
+	  for (i = 0; i < nargs; i++)
+	    mark_object (backlist->args[i]);
+      }
+
+    mark_redisplay (mark_object);
+    mark_profiling_info (mark_object);
+  }
+
+  /* OK, now do the after-mark stuff.  This is for things that
+     are only marked when something else is marked (e.g. weak hashtables).
+     There may be complex dependencies between such objects -- e.g.
+     a weak hashtable might be unmarked, but after processing a later
+     weak hashtable, the former one might get marked.  So we have to
+     iterate until nothing more gets marked. */
+  {
+    int did_mark;
+    /* Need to iterate until there's nothing more to mark, in case
+       of chains of mark dependencies. */
+    do
+      {
+        did_mark = 0;
+	did_mark += !!finish_marking_weak_hashtables (marked_p, mark_object);
+	did_mark += !!finish_marking_weak_lists (marked_p, mark_object);
+      }
+    while (did_mark);
+  }
+
+  /* And prune (this needs to be called after everything else has been
+     marked and before we do any sweeping). */
+  /* #### this is somewhat ad-hoc and should probably be an object
+     method */
+  prune_weak_hashtables (marked_p);
+  prune_weak_lists (marked_p);
+  prune_specifiers (marked_p);
+
+  gc_sweep ();
+
+  consing_since_gc = 0;
+#ifndef DEBUG_XEMACS
+  /* Allow you to set it really fucking low if you really want ... */
+  if (gc_cons_threshold < 10000)
+    gc_cons_threshold = 10000;
+#endif
+
+  gc_in_progress = 0;
+
+  /******* End of garbage collection ********/
+
+  run_hook_trapping_errors ("Error in post-gc-hook", Qpost_gc_hook);
+
+  /* Now remove the GC cursor/message */
+  if (!noninteractive)
+    {
+      if (cursor_changed)
+	Fset_frame_pointer (make_frame (f), pre_gc_cursor);
+      else if (!FRAME_STREAM_P (f))
+	{
+	  char *msg = (STRINGP (Vgc_message)
+		       ? GETTEXT ((char *) string_data (XSTRING (Vgc_message)))
+		       : 0);
+
+	  /* Show "...done" only if the echo area would otherwise be empty. */
+	  if (NILP (clear_echo_area (selected_frame (), 
+				     Qgarbage_collecting, 0)))
+	    {
+	      Lisp_Object args[2], whole_msg;
+	      args[0] = build_string (msg ? msg :
+				      GETTEXT ((CONST char *)
+					       gc_default_message));
+	      args[1] = build_string ("... done");
+	      whole_msg = Fconcat (2, args);
+	      echo_area_message (selected_frame (), (Bufbyte *) 0,
+				 whole_msg, 0, -1,
+				 Qgarbage_collecting);
+	    }
+	}
+    }
+
+  /* now stop inhibiting GC */
+  unbind_to (speccount, Qnil);
+
+  if (!breathing_space)
+    {
+      breathing_space = (void *) malloc (4096 - MALLOC_OVERHEAD);
+    }
+
+  UNGCPRO;
+  return;
+}
+
+#ifdef EMACS_BTL
+ /* This isn't actually called.  BTL recognizes the stack frame of the top
+    of the garbage collector by noting that PC is between &garbage_collect_1
+    and &BTL_after_garbage_collect_1_stub.  So this fn must be right here.
+    There's not any other way to know the address of the end of a function.
+  */
+void BTL_after_garbage_collect_1_stub () { abort (); }
+#endif
+
+/* Debugging aids.  */
+
+static Lisp_Object
+gc_plist_hack (CONST char *name, int value, Lisp_Object tail)
+{
+  /* C doesn't have local functions (or closures, or GC, or readable syntax,
+     or portable numeric datatypes, or bit-vectors, or characters, or
+     arrays, or exceptions, or ...) */
+  return (cons3 (intern (name), make_int (value), tail));
+}
+
+#define HACK_O_MATIC(type, name, pl)					\
+  {									\
+    int s = 0;								\
+    struct type##_block *x = current_##type##_block;			\
+    while (x) { s += sizeof (*x) + MALLOC_OVERHEAD; x = x->prev; }	\
+    (pl) = gc_plist_hack ((name), s, (pl));				\
+  }
+
+DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "" /*
+Reclaim storage for Lisp objects no longer needed.
+Returns info on amount of space in use:
+ ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)
+  (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS
+  PLIST) 
+  where `PLIST' is a list of alternating keyword/value pairs providing
+  more detailed information.
+Garbage collection happens automatically if you cons more than
+`gc-cons-threshold' bytes of Lisp data since previous garbage collection.
+*/ )
+  ()
+{
+  Lisp_Object pl = Qnil;
+  Lisp_Object ret[6];
+  int i;
+
+  garbage_collect_1 ();
+
+  for (i = 0; i < last_lrecord_type_index_assigned; i++)
+    {
+      if (lcrecord_stats[i].bytes_in_use != 0 
+          || lcrecord_stats[i].bytes_freed != 0
+	  || lcrecord_stats[i].instances_on_free_list != 0)
+        {
+          char buf [255];
+          CONST char *name = lrecord_implementations_table[i]->name;
+	  int len = strlen (name);
+          sprintf (buf, "%s-storage", name);
+          pl = gc_plist_hack (buf, lcrecord_stats[i].bytes_in_use, pl);
+	  /* Okay, simple pluralization check for `symbol-value-varalias' */
+	  if (name[len-1] == 's')
+	    sprintf (buf, "%ses-freed", name);
+	  else
+	    sprintf (buf, "%ss-freed", name);
+          if (lcrecord_stats[i].instances_freed != 0)
+            pl = gc_plist_hack (buf, lcrecord_stats[i].instances_freed, pl);
+	  if (name[len-1] == 's')
+	    sprintf (buf, "%ses-on-free-list", name);
+	  else
+	    sprintf (buf, "%ss-on-free-list", name);
+          if (lcrecord_stats[i].instances_on_free_list != 0)
+            pl = gc_plist_hack (buf, lcrecord_stats[i].instances_on_free_list,
+				pl);
+	  if (name[len-1] == 's')
+	    sprintf (buf, "%ses-used", name);
+	  else
+	    sprintf (buf, "%ss-used", name);
+          pl = gc_plist_hack (buf, lcrecord_stats[i].instances_in_use, pl);
+        }
+    }
+
+  HACK_O_MATIC (extent, "extent-storage", pl);
+  pl = gc_plist_hack ("extents-free", gc_count_num_extent_freelist, pl);
+  pl = gc_plist_hack ("extents-used", gc_count_num_extent_in_use, pl);
+  HACK_O_MATIC (event, "event-storage", pl);
+  pl = gc_plist_hack ("events-free", gc_count_num_event_freelist, pl);
+  pl = gc_plist_hack ("events-used", gc_count_num_event_in_use, pl);
+  HACK_O_MATIC (marker, "marker-storage", pl);
+  pl = gc_plist_hack ("markers-free", gc_count_num_marker_freelist, pl);
+  pl = gc_plist_hack ("markers-used", gc_count_num_marker_in_use, pl);
+#ifdef LISP_FLOAT_TYPE
+  HACK_O_MATIC (float, "float-storage", pl);
+  pl = gc_plist_hack ("floats-free", gc_count_num_float_freelist, pl);
+  pl = gc_plist_hack ("floats-used", gc_count_num_float_in_use, pl);
+#endif /* LISP_FLOAT_TYPE */
+  HACK_O_MATIC (string, "string-header-storage", pl);
+  pl = gc_plist_hack ("long-strings-total-length", 
+                      gc_count_string_total_size
+		      - gc_count_short_string_total_size, pl);
+  HACK_O_MATIC (string_chars, "short-string-storage", pl);
+  pl = gc_plist_hack ("short-strings-total-length",
+                      gc_count_short_string_total_size, pl);
+  pl = gc_plist_hack ("strings-free", gc_count_num_string_freelist, pl);
+  pl = gc_plist_hack ("long-strings-used", 
+                      gc_count_num_string_in_use
+		      - gc_count_num_short_string_in_use, pl);
+  pl = gc_plist_hack ("short-strings-used", 
+                      gc_count_num_short_string_in_use, pl);
+
+  HACK_O_MATIC (compiled_function, "compiled-function-storage", pl);
+  pl = gc_plist_hack ("compiled-functions-free",
+		      gc_count_num_compiled_function_freelist, pl);
+  pl = gc_plist_hack ("compiled-functions-used",
+		      gc_count_num_compiled_function_in_use, pl);
+
+  pl = gc_plist_hack ("vector-storage", gc_count_vector_storage, pl);
+  pl = gc_plist_hack ("vectors-total-length", 
+                      gc_count_vector_total_size, pl);
+  pl = gc_plist_hack ("vectors-used", gc_count_num_vector_used, pl);
+
+  pl = gc_plist_hack ("bit-vector-storage", gc_count_bit_vector_storage, pl);
+  pl = gc_plist_hack ("bit-vectors-total-length", 
+                      gc_count_bit_vector_total_size, pl);
+  pl = gc_plist_hack ("bit-vectors-used", gc_count_num_bit_vector_used, pl);
+
+  HACK_O_MATIC (symbol, "symbol-storage", pl);
+  pl = gc_plist_hack ("symbols-free", gc_count_num_symbol_freelist, pl);
+  pl = gc_plist_hack ("symbols-used", gc_count_num_symbol_in_use, pl);
+
+  HACK_O_MATIC (cons, "cons-storage", pl);
+  pl = gc_plist_hack ("conses-free", gc_count_num_cons_freelist, pl);
+  pl = gc_plist_hack ("conses-used", gc_count_num_cons_in_use, pl);
+
+  /* The things we do for backwards-compatibility */
+  ret[0] = Fcons (make_int (gc_count_num_cons_in_use),
+                  make_int (gc_count_num_cons_freelist));
+  ret[1] = Fcons (make_int (gc_count_num_symbol_in_use),
+                  make_int (gc_count_num_symbol_freelist));
+  ret[2] = Fcons (make_int (gc_count_num_marker_in_use),
+                  make_int (gc_count_num_marker_freelist));
+  ret[3] = make_int (gc_count_string_total_size);
+  ret[4] = make_int (gc_count_vector_total_size);
+  ret[5] = pl;
+  return (Flist (6, ret));
+}
+#undef HACK_O_MATIC
+
+DEFUN ("consing-since-gc", Fconsing_since_gc, Sconsing_since_gc, 0, 0, "" /*
+Return the number of bytes consed since the last garbage collection.
+\"Consed\" is a misnomer in that this actually counts allocation
+of all different kinds of objects, not just conses.
+
+If this value exceeds `gc-cons-threshold', a garbage collection happens.
+*/ )
+  ()
+{
+  return (make_int (consing_since_gc));
+}
+  
+DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, "" /*
+Return the address of the last byte Emacs has allocated, divided by 1024.
+This may be helpful in debugging Emacs's memory usage.
+The value is divided by 1024 to make sure it will fit in a lisp integer.
+*/ )
+  ()
+{
+  return (make_int ((EMACS_INT) sbrk (0) / 1024));
+}
+
+
+
+int
+object_dead_p (Lisp_Object obj)
+{
+  return ((BUFFERP (obj) && !BUFFER_LIVE_P (XBUFFER (obj))) ||
+	  (FRAMEP (obj) && !FRAME_LIVE_P (XFRAME (obj))) ||
+	  (WINDOWP (obj) && !WINDOW_LIVE_P (XWINDOW (obj))) ||
+	  (DEVICEP (obj) && !DEVICE_LIVE_P (XDEVICE (obj))) ||
+	  (CONSOLEP (obj) && !CONSOLE_LIVE_P (XCONSOLE (obj))) ||
+	  (EVENTP (obj) && !EVENT_LIVE_P (XEVENT (obj))) ||
+	  (EXTENTP (obj) && !EXTENT_LIVE_P (XEXTENT (obj))));
+	  
+}
+
+#ifdef MEMORY_USAGE_STATS
+
+/* Attempt to determine the actual amount of space that is used for
+   the block allocated starting at PTR, supposedly of size "CLAIMED_SIZE".
+
+   It seems that the following holds:
+
+   1. When using the old allocator (malloc.c):
+
+      -- blocks are always allocated in chunks of powers of two.  For
+	 each block, there is an overhead of 8 bytes if rcheck is not
+	 defined, 20 bytes if it is defined.  In other words, a
+	 one-byte allocation needs 8 bytes of overhead for a total of
+	 9 bytes, and needs to have 16 bytes of memory chunked out for
+	 it.
+
+   2. When using the new allocator (gmalloc.c):
+
+      -- blocks are always allocated in chunks of powers of two up
+         to 4096 bytes.  Larger blocks are allocated in chunks of
+	 an integral multiple of 4096 bytes.  The minimum block
+         size is 2*sizeof (void *), or 16 bytes if SUNOS_LOCALTIME_BUG
+	 is defined.  There is no per-block overhead, but there
+	 is an overhead of 3*sizeof (size_t) for each 4096 bytes
+	 allocated.
+
+    3. When using the system malloc, anything goes, but they are
+       generally slower and more space-efficient than the GNU
+       allocators.  One possibly reasonable assumption to make
+       for want of better data is that sizeof (void *), or maybe
+       2 * sizeof (void *), is required as overhead and that
+       blocks are allocated in the minimum required size except
+       that some minimum block size is imposed (e.g. 16 bytes). */
+
+int
+malloced_storage_size (void *ptr, int claimed_size,
+		       struct overhead_stats *stats)
+{
+  int orig_claimed_size = claimed_size;
+
+#ifdef GNU_MALLOC
+
+  if (claimed_size < 2 * sizeof (void *))
+    claimed_size = 2 * sizeof (void *);
+# ifdef SUNOS_LOCALTIME_BUG
+  if (claimed_size < 16)
+    claimed_size = 16;
+# endif
+  if (claimed_size < 4096)
+    {
+      int log = 1;
+
+      /* compute the log base two, more or less, then use it to compute
+	 the block size needed. */
+      claimed_size--;
+      /* It's big, it's heavy, it's wood! */
+      while ((claimed_size /= 2) != 0)
+	++log;
+      claimed_size = 1;
+      /* It's better than bad, it's good! */
+      while (log > 0)
+        {
+	  claimed_size *= 2;
+          log--;
+        }
+      /* We have to come up with some average about the amount of
+	 blocks used. */
+      if ((rand () & 4095) < claimed_size)
+	claimed_size += 3 * sizeof (void *);
+    }
+  else
+    {
+      claimed_size += 4095;
+      claimed_size &= ~4095;
+      claimed_size += (claimed_size / 4096) * 3 * sizeof (size_t);
+    }
+
+#elif defined (SYSTEM_MALLOC)
+
+  if (claimed_size < 16)
+    claimed_size = 16;
+  claimed_size += 2 * sizeof (void *);
+
+#else /* old GNU allocator */
+
+# ifdef rcheck /* #### may not be defined here */
+  claimed_size += 20;
+# else
+  claimed_size += 8;
+# endif
+  {
+    int log = 1;
+
+    /* compute the log base two, more or less, then use it to compute
+       the block size needed. */
+    claimed_size--;
+    /* It's big, it's heavy, it's wood! */
+    while ((claimed_size /= 2) != 0)
+      ++log;
+    claimed_size = 1;
+    /* It's better than bad, it's good! */
+    while (log > 0)
+      {
+	claimed_size *= 2;
+        log--;
+      }
+  }
+
+#endif /* old GNU allocator */
+
+  if (stats)
+    {
+      stats->was_requested += orig_claimed_size;
+      stats->malloc_overhead += claimed_size - orig_claimed_size;
+    }
+  return claimed_size;
+}
+
+int
+fixed_type_block_overhead (int size)
+{
+  int per_block = TYPE_ALLOC_SIZE (cons, unsigned char);
+  int overhead = 0;
+  int storage_size = malloced_storage_size (0, per_block, 0);
+  while (size >= per_block)
+    {
+      size -= per_block;
+      overhead += sizeof (void *) + per_block - storage_size;
+
+    }
+  if (rand () % per_block < size)
+    overhead += sizeof (void *) + per_block - storage_size;
+  return overhead;
+}
+
+#endif /* MEMORY_USAGE_STATS */
+
+
+/* Initialization */
+void
+init_alloc_once_early (void)
+{
+  int iii;
+
+#ifdef PURESTAT
+  for (iii = 0; iii < countof (purestats); iii++)
+    {
+      if (! purestats[iii]) continue;
+      purestats[iii]->nobjects = 0;
+      purestats[iii]->nbytes = 0;
+    }
+  purecopying_for_bytecode = 0;
+#endif
+  
+  last_lrecord_type_index_assigned = -1;
+  for (iii = 0; iii < countof (lrecord_implementations_table); iii++)
+    {
+      lrecord_implementations_table[iii] = 0;
+    }
+  
+  symbols_initialized = 0;
+  
+  gc_generation_number[0] = 0;
+  /* purify_flag 1 is correct even if CANNOT_DUMP.
+   * loadup.el will set to nil at end. */
+  purify_flag = 1;
+  pureptr = 0;
+  pure_lossage = 0;
+  breathing_space = 0;
+  XSETINT (all_vectors, 0); /* Qzero may not be set yet. */
+  XSETINT (all_bit_vectors, 0); /* Qzero may not be set yet. */
+  XSETINT (Vgc_message, 0);
+  all_lcrecords = 0;
+  ignore_malloc_warnings = 1;
+  init_string_alloc ();
+  init_string_chars_alloc ();
+  init_cons_alloc ();
+  init_symbol_alloc ();
+  init_compiled_function_alloc ();
+#ifdef LISP_FLOAT_TYPE
+  init_float_alloc ();
+#endif /* LISP_FLOAT_TYPE */
+#ifndef standalone
+  init_marker_alloc ();
+  init_extent_alloc ();
+  init_event_alloc ();
+#endif
+  ignore_malloc_warnings = 0;
+  staticidx = 0;
+  consing_since_gc = 0;
+#if 1
+  gc_cons_threshold = 500000; /* XEmacs change */
+#else
+  gc_cons_threshold = 15000; /* debugging */
+#endif
+#ifdef VIRT_ADDR_VARIES
+  malloc_sbrk_unused = 1<<22;	/* A large number */
+  malloc_sbrk_used = 100000;	/* as reasonable as any number */
+#endif /* VIRT_ADDR_VARIES */
+  lrecord_uid_counter = 259;
+  debug_string_purity = 0;
+  gcprolist = 0;
+
+  gc_currently_forbidden = 0;
+  gc_hooks_inhibited = 0;
+
+#ifdef ERROR_CHECK_TYPECHECK
+  ERROR_ME.really_unlikely_name_to_have_accidentally_in_a_non_errb_structure =
+    666;
+  ERROR_ME_NOT.
+    really_unlikely_name_to_have_accidentally_in_a_non_errb_structure = 42;
+  ERROR_ME_WARN.
+    really_unlikely_name_to_have_accidentally_in_a_non_errb_structure =
+      3333632;
+#endif
+}
+
+void
+reinit_alloc (void)
+{
+  gcprolist = 0;
+}
+
+void
+syms_of_alloc (void)
+{
+  defsymbol (&Qpre_gc_hook, "pre-gc-hook");
+  defsymbol (&Qpost_gc_hook, "post-gc-hook");
+  defsymbol (&Qgarbage_collecting, "garbage-collecting");
+
+  defsubr (&Scons);
+  defsubr (&Slist);
+  defsubr (&Svector);
+  defsubr (&Sbit_vector);
+  defsubr (&Smake_byte_code);
+  defsubr (&Smake_list);
+  defsubr (&Smake_vector);
+  defsubr (&Smake_bit_vector);
+  defsubr (&Smake_string);
+  defsubr (&Smake_symbol);
+  defsubr (&Smake_marker);
+  defsubr (&Spurecopy);
+  defsubr (&Sgarbage_collect);
+  defsubr (&Smemory_limit);
+  defsubr (&Sconsing_since_gc);
+}
+
+void
+vars_of_alloc (void)
+{
+  DEFVAR_INT ("gc-cons-threshold", &gc_cons_threshold /*
+*Number of bytes of consing between garbage collections.
+\"Consing\" is a misnomer in that this actually counts allocation
+of all different kinds of objects, not just conses.
+Garbage collection can happen automatically once this many bytes have been
+allocated since the last garbage collection.  All data types count.
+
+Garbage collection happens automatically when `eval' or `funcall' are
+called.  (Note that `funcall' is called implicitly as part of evaluation.)
+By binding this temporarily to a large number, you can effectively
+prevent garbage collection during a part of the program.
+
+See also `consing-since-gc'.
+*/ );
+
+  DEFVAR_INT ("pure-bytes-used", &pureptr /*
+Number of bytes of sharable Lisp data allocated so far.
+*/ );
+
+#if 0
+  DEFVAR_INT ("data-bytes-used", &malloc_sbrk_used /*
+Number of bytes of unshared memory allocated in this session.
+*/ );
+
+  DEFVAR_INT ("data-bytes-free", &malloc_sbrk_unused /*
+Number of bytes of unshared memory remaining available in this session.
+*/ );
+#endif
+
+#ifdef DEBUG_XEMACS
+  DEFVAR_INT ("debug-allocation", &debug_allocation /*
+If non-zero, print out information to stderr about all objects allocated.
+See also `debug-allocation-backtrace-length'.
+*/ );
+  debug_allocation = 0;
+
+  DEFVAR_INT ("debug-allocation-backtrace-length",
+	      &debug_allocation_backtrace_length /*
+Length (in stack frames) of short backtrace printed out by `debug-allocation'.
+*/ );
+  debug_allocation_backtrace_length = 2;
+#endif
+
+  DEFVAR_BOOL ("purify-flag", &purify_flag /*
+Non-nil means loading Lisp code in order to dump an executable.
+This means that certain objects should be allocated in shared (pure) space.
+*/ );
+
+  DEFVAR_LISP ("pre-gc-hook", &Vpre_gc_hook /*
+Function or functions to be run just before each garbage collection.
+Interrupts, garbage collection, and errors are inhibited while this hook
+runs, so be extremely careful in what you add here.  In particular, avoid
+consing, and do not interact with the user.
+*/ );
+  Vpre_gc_hook = Qnil;
+
+  DEFVAR_LISP ("post-gc-hook", &Vpost_gc_hook /*
+Function or functions to be run just after each garbage collection.
+Interrupts, garbage collection, and errors are inhibited while this hook
+runs, so be extremely careful in what you add here.  In particular, avoid
+consing, and do not interact with the user.
+*/ );
+  Vpost_gc_hook = Qnil;
+
+  DEFVAR_LISP ("gc-message", &Vgc_message /*
+String to print to indicate that a garbage collection is in progress.
+This is printed in the echo area.  If the selected frame is on a
+window system and `gc-pointer-glyph' specifies a value (i.e. a pointer
+image instance) in the domain of the selected frame, the mouse pointer
+will change instead of this message being printed.
+*/ );
+  Vgc_message = make_pure_string ((CONST Bufbyte *) gc_default_message,
+				  countof (gc_default_message) - 1,
+				  Qnil, 1);
+
+  DEFVAR_LISP ("gc-pointer-glyph", &Vgc_pointer_glyph /*
+Pointer glyph used to indicate that a garbage collection is in progress.
+If the selected window is on a window system and this glyph specifies a
+value (i.e. a pointer image instance) in the domain of the selected
+window, the pointer will be changed as specified during garbage collection.
+Otherwise, a message will be printed in the echo area, as controlled
+by `gc-message'.
+*/ );
+}
+
+void
+complex_vars_of_alloc (void)
+{
+  Vgc_pointer_glyph = Fmake_glyph_internal (Qpointer);
+}