1 /* Storage allocation and gc for GNU Emacs Lisp interpreter.
2 Copyright (C) 1985,86,88,93,94,95,97,98,1999,2000,01,02,03,2004
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #include <limits.h> /* For CHAR_BIT. */
30 /* Note that this declares bzero on OSF/1. How dumb. */
34 /* This file is part of the core Lisp implementation, and thus must
35 deal with the real data structures. If the Lisp implementation is
36 replaced, this file likely will not be used. */
38 #undef HIDE_LISP_IMPLEMENTATION
41 #include "intervals.h"
47 #include "blockinput.h"
49 #include "syssignal.h"
52 /* GC_MALLOC_CHECK defined means perform validity checks of malloc'd
53 memory. Can do this only if using gmalloc.c. */
55 #if defined SYSTEM_MALLOC || defined DOUG_LEA_MALLOC
56 #undef GC_MALLOC_CHECK
62 extern POINTER_TYPE
*sbrk ();
65 #ifdef DOUG_LEA_MALLOC
68 /* malloc.h #defines this as size_t, at least in glibc2. */
69 #ifndef __malloc_size_t
70 #define __malloc_size_t int
73 /* Specify maximum number of areas to mmap. It would be nice to use a
74 value that explicitly means "no limit". */
76 #define MMAP_MAX_AREAS 100000000
78 #else /* not DOUG_LEA_MALLOC */
80 /* The following come from gmalloc.c. */
82 #define __malloc_size_t size_t
83 extern __malloc_size_t _bytes_used
;
84 extern __malloc_size_t __malloc_extra_blocks
;
86 #endif /* not DOUG_LEA_MALLOC */
88 /* Value of _bytes_used, when spare_memory was freed. */
90 static __malloc_size_t bytes_used_when_full
;
92 /* Mark, unmark, query mark bit of a Lisp string. S must be a pointer
93 to a struct Lisp_String. */
95 #define MARK_STRING(S) ((S)->size |= ARRAY_MARK_FLAG)
96 #define UNMARK_STRING(S) ((S)->size &= ~ARRAY_MARK_FLAG)
97 #define STRING_MARKED_P(S) ((S)->size & ARRAY_MARK_FLAG)
99 #define VECTOR_MARK(V) ((V)->size |= ARRAY_MARK_FLAG)
100 #define VECTOR_UNMARK(V) ((V)->size &= ~ARRAY_MARK_FLAG)
101 #define VECTOR_MARKED_P(V) ((V)->size & ARRAY_MARK_FLAG)
103 /* Value is the number of bytes/chars of S, a pointer to a struct
104 Lisp_String. This must be used instead of STRING_BYTES (S) or
105 S->size during GC, because S->size contains the mark bit for
108 #define GC_STRING_BYTES(S) (STRING_BYTES (S))
109 #define GC_STRING_CHARS(S) ((S)->size & ~ARRAY_MARK_FLAG)
111 /* Number of bytes of consing done since the last gc. */
113 int consing_since_gc
;
115 /* Count the amount of consing of various sorts of space. */
117 EMACS_INT cons_cells_consed
;
118 EMACS_INT floats_consed
;
119 EMACS_INT vector_cells_consed
;
120 EMACS_INT symbols_consed
;
121 EMACS_INT string_chars_consed
;
122 EMACS_INT misc_objects_consed
;
123 EMACS_INT intervals_consed
;
124 EMACS_INT strings_consed
;
126 /* Number of bytes of consing since GC before another GC should be done. */
128 EMACS_INT gc_cons_threshold
;
130 /* Nonzero during GC. */
134 /* Nonzero means abort if try to GC.
135 This is for code which is written on the assumption that
136 no GC will happen, so as to verify that assumption. */
140 /* Nonzero means display messages at beginning and end of GC. */
142 int garbage_collection_messages
;
144 #ifndef VIRT_ADDR_VARIES
146 #endif /* VIRT_ADDR_VARIES */
147 int malloc_sbrk_used
;
149 #ifndef VIRT_ADDR_VARIES
151 #endif /* VIRT_ADDR_VARIES */
152 int malloc_sbrk_unused
;
154 /* Two limits controlling how much undo information to keep. */
156 EMACS_INT undo_limit
;
157 EMACS_INT undo_strong_limit
;
159 /* Number of live and free conses etc. */
161 static int total_conses
, total_markers
, total_symbols
, total_vector_size
;
162 static int total_free_conses
, total_free_markers
, total_free_symbols
;
163 static int total_free_floats
, total_floats
;
165 /* Points to memory space allocated as "spare", to be freed if we run
168 static char *spare_memory
;
170 /* Amount of spare memory to keep in reserve. */
172 #define SPARE_MEMORY (1 << 14)
174 /* Number of extra blocks malloc should get when it needs more core. */
176 static int malloc_hysteresis
;
178 /* Non-nil means defun should do purecopy on the function definition. */
180 Lisp_Object Vpurify_flag
;
182 /* Non-nil means we are handling a memory-full error. */
184 Lisp_Object Vmemory_full
;
188 /* Force it into data space! Initialize it to a nonzero value;
189 otherwise some compilers put it into BSS. */
191 EMACS_INT pure
[PURESIZE
/ sizeof (EMACS_INT
)] = {1,};
192 #define PUREBEG (char *) pure
196 #define pure PURE_SEG_BITS /* Use shared memory segment */
197 #define PUREBEG (char *)PURE_SEG_BITS
199 #endif /* HAVE_SHM */
201 /* Pointer to the pure area, and its size. */
203 static char *purebeg
;
204 static size_t pure_size
;
206 /* Number of bytes of pure storage used before pure storage overflowed.
207 If this is non-zero, this implies that an overflow occurred. */
209 static size_t pure_bytes_used_before_overflow
;
211 /* Value is non-zero if P points into pure space. */
213 #define PURE_POINTER_P(P) \
214 (((PNTR_COMPARISON_TYPE) (P) \
215 < (PNTR_COMPARISON_TYPE) ((char *) purebeg + pure_size)) \
216 && ((PNTR_COMPARISON_TYPE) (P) \
217 >= (PNTR_COMPARISON_TYPE) purebeg))
219 /* Index in pure at which next pure object will be allocated.. */
221 EMACS_INT pure_bytes_used
;
223 /* If nonzero, this is a warning delivered by malloc and not yet
226 char *pending_malloc_warning
;
228 /* Pre-computed signal argument for use when memory is exhausted. */
230 Lisp_Object Vmemory_signal_data
;
232 /* Maximum amount of C stack to save when a GC happens. */
234 #ifndef MAX_SAVE_STACK
235 #define MAX_SAVE_STACK 16000
238 /* Buffer in which we save a copy of the C stack at each GC. */
243 /* Non-zero means ignore malloc warnings. Set during initialization.
244 Currently not used. */
248 Lisp_Object Qgc_cons_threshold
, Qchar_table_extra_slots
;
250 /* Hook run after GC has finished. */
252 Lisp_Object Vpost_gc_hook
, Qpost_gc_hook
;
254 Lisp_Object Vgc_elapsed
; /* accumulated elapsed time in GC */
255 EMACS_INT gcs_done
; /* accumulated GCs */
257 static void mark_buffer
P_ ((Lisp_Object
));
258 extern void mark_kboards
P_ ((void));
259 extern void mark_ttys
P_ ((void));
260 static void gc_sweep
P_ ((void));
261 static void mark_glyph_matrix
P_ ((struct glyph_matrix
*));
262 static void mark_face_cache
P_ ((struct face_cache
*));
264 #ifdef HAVE_WINDOW_SYSTEM
265 static void mark_image
P_ ((struct image
*));
266 static void mark_image_cache
P_ ((struct frame
*));
267 #endif /* HAVE_WINDOW_SYSTEM */
269 static struct Lisp_String
*allocate_string
P_ ((void));
270 static void compact_small_strings
P_ ((void));
271 static void free_large_strings
P_ ((void));
272 static void sweep_strings
P_ ((void));
274 extern int message_enable_multibyte
;
276 /* When scanning the C stack for live Lisp objects, Emacs keeps track
277 of what memory allocated via lisp_malloc is intended for what
278 purpose. This enumeration specifies the type of memory. */
289 /* Keep the following vector-like types together, with
290 MEM_TYPE_WINDOW being the last, and MEM_TYPE_VECTOR the
291 first. Or change the code of live_vector_p, for instance. */
299 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
301 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
302 #include <stdio.h> /* For fprintf. */
305 /* A unique object in pure space used to make some Lisp objects
306 on free lists recognizable in O(1). */
310 #ifdef GC_MALLOC_CHECK
312 enum mem_type allocated_mem_type
;
313 int dont_register_blocks
;
315 #endif /* GC_MALLOC_CHECK */
317 /* A node in the red-black tree describing allocated memory containing
318 Lisp data. Each such block is recorded with its start and end
319 address when it is allocated, and removed from the tree when it
322 A red-black tree is a balanced binary tree with the following
325 1. Every node is either red or black.
326 2. Every leaf is black.
327 3. If a node is red, then both of its children are black.
328 4. Every simple path from a node to a descendant leaf contains
329 the same number of black nodes.
330 5. The root is always black.
332 When nodes are inserted into the tree, or deleted from the tree,
333 the tree is "fixed" so that these properties are always true.
335 A red-black tree with N internal nodes has height at most 2
336 log(N+1). Searches, insertions and deletions are done in O(log N).
337 Please see a text book about data structures for a detailed
338 description of red-black trees. Any book worth its salt should
343 /* Children of this node. These pointers are never NULL. When there
344 is no child, the value is MEM_NIL, which points to a dummy node. */
345 struct mem_node
*left
, *right
;
347 /* The parent of this node. In the root node, this is NULL. */
348 struct mem_node
*parent
;
350 /* Start and end of allocated region. */
354 enum {MEM_BLACK
, MEM_RED
} color
;
360 /* Base address of stack. Set in main. */
362 Lisp_Object
*stack_base
;
364 /* Root of the tree describing allocated Lisp memory. */
366 static struct mem_node
*mem_root
;
368 /* Lowest and highest known address in the heap. */
370 static void *min_heap_address
, *max_heap_address
;
372 /* Sentinel node of the tree. */
374 static struct mem_node mem_z
;
375 #define MEM_NIL &mem_z
377 static POINTER_TYPE
*lisp_malloc
P_ ((size_t, enum mem_type
));
378 static struct Lisp_Vector
*allocate_vectorlike
P_ ((EMACS_INT
, enum mem_type
));
379 static void lisp_free
P_ ((POINTER_TYPE
*));
380 static void mark_stack
P_ ((void));
381 static int live_vector_p
P_ ((struct mem_node
*, void *));
382 static int live_buffer_p
P_ ((struct mem_node
*, void *));
383 static int live_string_p
P_ ((struct mem_node
*, void *));
384 static int live_cons_p
P_ ((struct mem_node
*, void *));
385 static int live_symbol_p
P_ ((struct mem_node
*, void *));
386 static int live_float_p
P_ ((struct mem_node
*, void *));
387 static int live_misc_p
P_ ((struct mem_node
*, void *));
388 static void mark_maybe_object
P_ ((Lisp_Object
));
389 static void mark_memory
P_ ((void *, void *));
390 static void mem_init
P_ ((void));
391 static struct mem_node
*mem_insert
P_ ((void *, void *, enum mem_type
));
392 static void mem_insert_fixup
P_ ((struct mem_node
*));
393 static void mem_rotate_left
P_ ((struct mem_node
*));
394 static void mem_rotate_right
P_ ((struct mem_node
*));
395 static void mem_delete
P_ ((struct mem_node
*));
396 static void mem_delete_fixup
P_ ((struct mem_node
*));
397 static INLINE
struct mem_node
*mem_find
P_ ((void *));
399 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
400 static void check_gcpros
P_ ((void));
403 #endif /* GC_MARK_STACK || GC_MALLOC_CHECK */
405 /* Recording what needs to be marked for gc. */
407 struct gcpro
*gcprolist
;
409 /* Addresses of staticpro'd variables. Initialize it to a nonzero
410 value; otherwise some compilers put it into BSS. */
412 #define NSTATICS 1280
413 Lisp_Object
*staticvec
[NSTATICS
] = {&Vpurify_flag
};
415 /* Index of next unused slot in staticvec. */
419 static POINTER_TYPE
*pure_alloc
P_ ((size_t, int));
422 /* Value is SZ rounded up to the next multiple of ALIGNMENT.
423 ALIGNMENT must be a power of 2. */
425 #define ALIGN(ptr, ALIGNMENT) \
426 ((POINTER_TYPE *) ((((EMACS_UINT)(ptr)) + (ALIGNMENT) - 1) \
427 & ~((ALIGNMENT) - 1)))
431 /************************************************************************
433 ************************************************************************/
435 /* Function malloc calls this if it finds we are near exhausting storage. */
441 pending_malloc_warning
= str
;
445 /* Display an already-pending malloc warning. */
448 display_malloc_warning ()
450 call3 (intern ("display-warning"),
452 build_string (pending_malloc_warning
),
453 intern ("emergency"));
454 pending_malloc_warning
= 0;
458 #ifdef DOUG_LEA_MALLOC
459 # define BYTES_USED (mallinfo ().arena)
461 # define BYTES_USED _bytes_used
465 /* Called if malloc returns zero. */
472 #ifndef SYSTEM_MALLOC
473 bytes_used_when_full
= BYTES_USED
;
476 /* The first time we get here, free the spare memory. */
483 /* This used to call error, but if we've run out of memory, we could
484 get infinite recursion trying to build the string. */
486 Fsignal (Qnil
, Vmemory_signal_data
);
490 /* Called if we can't allocate relocatable space for a buffer. */
493 buffer_memory_full ()
495 /* If buffers use the relocating allocator, no need to free
496 spare_memory, because we may have plenty of malloc space left
497 that we could get, and if we don't, the malloc that fails will
498 itself cause spare_memory to be freed. If buffers don't use the
499 relocating allocator, treat this like any other failing
508 /* This used to call error, but if we've run out of memory, we could
509 get infinite recursion trying to build the string. */
511 Fsignal (Qnil
, Vmemory_signal_data
);
515 /* Like malloc but check for no memory and block interrupt input.. */
521 register POINTER_TYPE
*val
;
524 val
= (POINTER_TYPE
*) malloc (size
);
533 /* Like realloc but check for no memory and block interrupt input.. */
536 xrealloc (block
, size
)
540 register POINTER_TYPE
*val
;
543 /* We must call malloc explicitly when BLOCK is 0, since some
544 reallocs don't do this. */
546 val
= (POINTER_TYPE
*) malloc (size
);
548 val
= (POINTER_TYPE
*) realloc (block
, size
);
551 if (!val
&& size
) memory_full ();
556 /* Like free but block interrupt input. */
568 /* Like strdup, but uses xmalloc. */
574 size_t len
= strlen (s
) + 1;
575 char *p
= (char *) xmalloc (len
);
581 /* Like malloc but used for allocating Lisp data. NBYTES is the
582 number of bytes to allocate, TYPE describes the intended use of the
583 allcated memory block (for strings, for conses, ...). */
585 static void *lisp_malloc_loser
;
587 static POINTER_TYPE
*
588 lisp_malloc (nbytes
, type
)
596 #ifdef GC_MALLOC_CHECK
597 allocated_mem_type
= type
;
600 val
= (void *) malloc (nbytes
);
603 /* If the memory just allocated cannot be addressed thru a Lisp
604 object's pointer, and it needs to be,
605 that's equivalent to running out of memory. */
606 if (val
&& type
!= MEM_TYPE_NON_LISP
)
609 XSETCONS (tem
, (char *) val
+ nbytes
- 1);
610 if ((char *) XCONS (tem
) != (char *) val
+ nbytes
- 1)
612 lisp_malloc_loser
= val
;
619 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
620 if (val
&& type
!= MEM_TYPE_NON_LISP
)
621 mem_insert (val
, (char *) val
+ nbytes
, type
);
630 /* Free BLOCK. This must be called to free memory allocated with a
631 call to lisp_malloc. */
639 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
640 mem_delete (mem_find (block
));
645 /* Allocation of aligned blocks of memory to store Lisp data. */
646 /* The entry point is lisp_align_malloc which returns blocks of at most */
647 /* BLOCK_BYTES and guarantees they are aligned on a BLOCK_ALIGN boundary. */
650 /* BLOCK_ALIGN has to be a power of 2. */
651 #define BLOCK_ALIGN (1 << 10)
653 /* Padding to leave at the end of a malloc'd block. This is to give
654 malloc a chance to minimize the amount of memory wasted to alignment.
655 It should be tuned to the particular malloc library used.
656 On glibc-2.3.2, malloc never tries to align, so a padding of 0 is best.
657 posix_memalign on the other hand would ideally prefer a value of 4
658 because otherwise, there's 1020 bytes wasted between each ablocks.
659 But testing shows that those 1020 will most of the time be efficiently
660 used by malloc to place other objects, so a value of 0 is still preferable
661 unless you have a lot of cons&floats and virtually nothing else. */
662 #define BLOCK_PADDING 0
663 #define BLOCK_BYTES \
664 (BLOCK_ALIGN - sizeof (struct aligned_block *) - BLOCK_PADDING)
666 /* Internal data structures and constants. */
668 #define ABLOCKS_SIZE 16
670 /* An aligned block of memory. */
675 char payload
[BLOCK_BYTES
];
676 struct ablock
*next_free
;
678 /* `abase' is the aligned base of the ablocks. */
679 /* It is overloaded to hold the virtual `busy' field that counts
680 the number of used ablock in the parent ablocks.
681 The first ablock has the `busy' field, the others have the `abase'
682 field. To tell the difference, we assume that pointers will have
683 integer values larger than 2 * ABLOCKS_SIZE. The lowest bit of `busy'
684 is used to tell whether the real base of the parent ablocks is `abase'
685 (if not, the word before the first ablock holds a pointer to the
687 struct ablocks
*abase
;
688 /* The padding of all but the last ablock is unused. The padding of
689 the last ablock in an ablocks is not allocated. */
691 char padding
[BLOCK_PADDING
];
695 /* A bunch of consecutive aligned blocks. */
698 struct ablock blocks
[ABLOCKS_SIZE
];
701 /* Size of the block requested from malloc or memalign. */
702 #define ABLOCKS_BYTES (sizeof (struct ablocks) - BLOCK_PADDING)
704 #define ABLOCK_ABASE(block) \
705 (((unsigned long) (block)->abase) <= (1 + 2 * ABLOCKS_SIZE) \
706 ? (struct ablocks *)(block) \
709 /* Virtual `busy' field. */
710 #define ABLOCKS_BUSY(abase) ((abase)->blocks[0].abase)
712 /* Pointer to the (not necessarily aligned) malloc block. */
713 #ifdef HAVE_POSIX_MEMALIGN
714 #define ABLOCKS_BASE(abase) (abase)
716 #define ABLOCKS_BASE(abase) \
717 (1 & (long) ABLOCKS_BUSY (abase) ? abase : ((void**)abase)[-1])
720 /* The list of free ablock. */
721 static struct ablock
*free_ablock
;
723 /* Allocate an aligned block of nbytes.
724 Alignment is on a multiple of BLOCK_ALIGN and `nbytes' has to be
725 smaller or equal to BLOCK_BYTES. */
726 static POINTER_TYPE
*
727 lisp_align_malloc (nbytes
, type
)
732 struct ablocks
*abase
;
734 eassert (nbytes
<= BLOCK_BYTES
);
738 #ifdef GC_MALLOC_CHECK
739 allocated_mem_type
= type
;
745 EMACS_INT aligned
; /* int gets warning casting to 64-bit pointer. */
747 #ifdef DOUG_LEA_MALLOC
748 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
749 because mapped region contents are not preserved in
751 mallopt (M_MMAP_MAX
, 0);
754 #ifdef HAVE_POSIX_MEMALIGN
756 int err
= posix_memalign (&base
, BLOCK_ALIGN
, ABLOCKS_BYTES
);
757 abase
= err
? (base
= NULL
) : base
;
760 base
= malloc (ABLOCKS_BYTES
);
761 abase
= ALIGN (base
, BLOCK_ALIGN
);
769 aligned
= (base
== abase
);
771 ((void**)abase
)[-1] = base
;
773 #ifdef DOUG_LEA_MALLOC
774 /* Back to a reasonable maximum of mmap'ed areas. */
775 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
779 /* If the memory just allocated cannot be addressed thru a Lisp
780 object's pointer, and it needs to be, that's equivalent to
781 running out of memory. */
782 if (type
!= MEM_TYPE_NON_LISP
)
785 char *end
= (char *) base
+ ABLOCKS_BYTES
- 1;
787 if ((char *) XCONS (tem
) != end
)
789 lisp_malloc_loser
= base
;
797 /* Initialize the blocks and put them on the free list.
798 Is `base' was not properly aligned, we can't use the last block. */
799 for (i
= 0; i
< (aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1); i
++)
801 abase
->blocks
[i
].abase
= abase
;
802 abase
->blocks
[i
].x
.next_free
= free_ablock
;
803 free_ablock
= &abase
->blocks
[i
];
805 ABLOCKS_BUSY (abase
) = (struct ablocks
*) (long) aligned
;
807 eassert (0 == ((EMACS_UINT
)abase
) % BLOCK_ALIGN
);
808 eassert (ABLOCK_ABASE (&abase
->blocks
[3]) == abase
); /* 3 is arbitrary */
809 eassert (ABLOCK_ABASE (&abase
->blocks
[0]) == abase
);
810 eassert (ABLOCKS_BASE (abase
) == base
);
811 eassert (aligned
== (long) ABLOCKS_BUSY (abase
));
814 abase
= ABLOCK_ABASE (free_ablock
);
815 ABLOCKS_BUSY (abase
) = (struct ablocks
*) (2 + (long) ABLOCKS_BUSY (abase
));
817 free_ablock
= free_ablock
->x
.next_free
;
819 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
820 if (val
&& type
!= MEM_TYPE_NON_LISP
)
821 mem_insert (val
, (char *) val
+ nbytes
, type
);
828 eassert (0 == ((EMACS_UINT
)val
) % BLOCK_ALIGN
);
833 lisp_align_free (block
)
836 struct ablock
*ablock
= block
;
837 struct ablocks
*abase
= ABLOCK_ABASE (ablock
);
840 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
841 mem_delete (mem_find (block
));
843 /* Put on free list. */
844 ablock
->x
.next_free
= free_ablock
;
845 free_ablock
= ablock
;
846 /* Update busy count. */
847 ABLOCKS_BUSY (abase
) = (struct ablocks
*) (-2 + (long) ABLOCKS_BUSY (abase
));
849 if (2 > (long) ABLOCKS_BUSY (abase
))
850 { /* All the blocks are free. */
851 int i
= 0, aligned
= (long) ABLOCKS_BUSY (abase
);
852 struct ablock
**tem
= &free_ablock
;
853 struct ablock
*atop
= &abase
->blocks
[aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1];
857 if (*tem
>= (struct ablock
*) abase
&& *tem
< atop
)
860 *tem
= (*tem
)->x
.next_free
;
863 tem
= &(*tem
)->x
.next_free
;
865 eassert ((aligned
& 1) == aligned
);
866 eassert (i
== (aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1));
867 free (ABLOCKS_BASE (abase
));
872 /* Return a new buffer structure allocated from the heap with
873 a call to lisp_malloc. */
879 = (struct buffer
*) lisp_malloc (sizeof (struct buffer
),
885 /* Arranging to disable input signals while we're in malloc.
887 This only works with GNU malloc. To help out systems which can't
888 use GNU malloc, all the calls to malloc, realloc, and free
889 elsewhere in the code should be inside a BLOCK_INPUT/UNBLOCK_INPUT
890 pairs; unfortunately, we have no idea what C library functions
891 might call malloc, so we can't really protect them unless you're
892 using GNU malloc. Fortunately, most of the major operating systems
893 can use GNU malloc. */
895 #ifndef SYSTEM_MALLOC
896 #ifndef DOUG_LEA_MALLOC
897 extern void * (*__malloc_hook
) P_ ((size_t));
898 extern void * (*__realloc_hook
) P_ ((void *, size_t));
899 extern void (*__free_hook
) P_ ((void *));
900 /* Else declared in malloc.h, perhaps with an extra arg. */
901 #endif /* DOUG_LEA_MALLOC */
902 static void * (*old_malloc_hook
) ();
903 static void * (*old_realloc_hook
) ();
904 static void (*old_free_hook
) ();
906 /* This function is used as the hook for free to call. */
909 emacs_blocked_free (ptr
)
914 #ifdef GC_MALLOC_CHECK
920 if (m
== MEM_NIL
|| m
->start
!= ptr
)
923 "Freeing `%p' which wasn't allocated with malloc\n", ptr
);
928 /* fprintf (stderr, "free %p...%p (%p)\n", m->start, m->end, ptr); */
932 #endif /* GC_MALLOC_CHECK */
934 __free_hook
= old_free_hook
;
937 /* If we released our reserve (due to running out of memory),
938 and we have a fair amount free once again,
939 try to set aside another reserve in case we run out once more. */
940 if (spare_memory
== 0
941 /* Verify there is enough space that even with the malloc
942 hysteresis this call won't run out again.
943 The code here is correct as long as SPARE_MEMORY
944 is substantially larger than the block size malloc uses. */
945 && (bytes_used_when_full
946 > BYTES_USED
+ max (malloc_hysteresis
, 4) * SPARE_MEMORY
))
947 spare_memory
= (char *) malloc ((size_t) SPARE_MEMORY
);
949 __free_hook
= emacs_blocked_free
;
954 /* If we released our reserve (due to running out of memory),
955 and we have a fair amount free once again,
956 try to set aside another reserve in case we run out once more.
958 This is called when a relocatable block is freed in ralloc.c. */
961 refill_memory_reserve ()
963 if (spare_memory
== 0)
964 spare_memory
= (char *) malloc ((size_t) SPARE_MEMORY
);
968 /* This function is the malloc hook that Emacs uses. */
971 emacs_blocked_malloc (size
)
977 __malloc_hook
= old_malloc_hook
;
978 #ifdef DOUG_LEA_MALLOC
979 mallopt (M_TOP_PAD
, malloc_hysteresis
* 4096);
981 __malloc_extra_blocks
= malloc_hysteresis
;
984 value
= (void *) malloc (size
);
986 #ifdef GC_MALLOC_CHECK
988 struct mem_node
*m
= mem_find (value
);
991 fprintf (stderr
, "Malloc returned %p which is already in use\n",
993 fprintf (stderr
, "Region in use is %p...%p, %u bytes, type %d\n",
994 m
->start
, m
->end
, (char *) m
->end
- (char *) m
->start
,
999 if (!dont_register_blocks
)
1001 mem_insert (value
, (char *) value
+ max (1, size
), allocated_mem_type
);
1002 allocated_mem_type
= MEM_TYPE_NON_LISP
;
1005 #endif /* GC_MALLOC_CHECK */
1007 __malloc_hook
= emacs_blocked_malloc
;
1010 /* fprintf (stderr, "%p malloc\n", value); */
1015 /* This function is the realloc hook that Emacs uses. */
1018 emacs_blocked_realloc (ptr
, size
)
1025 __realloc_hook
= old_realloc_hook
;
1027 #ifdef GC_MALLOC_CHECK
1030 struct mem_node
*m
= mem_find (ptr
);
1031 if (m
== MEM_NIL
|| m
->start
!= ptr
)
1034 "Realloc of %p which wasn't allocated with malloc\n",
1042 /* fprintf (stderr, "%p -> realloc\n", ptr); */
1044 /* Prevent malloc from registering blocks. */
1045 dont_register_blocks
= 1;
1046 #endif /* GC_MALLOC_CHECK */
1048 value
= (void *) realloc (ptr
, size
);
1050 #ifdef GC_MALLOC_CHECK
1051 dont_register_blocks
= 0;
1054 struct mem_node
*m
= mem_find (value
);
1057 fprintf (stderr
, "Realloc returns memory that is already in use\n");
1061 /* Can't handle zero size regions in the red-black tree. */
1062 mem_insert (value
, (char *) value
+ max (size
, 1), MEM_TYPE_NON_LISP
);
1065 /* fprintf (stderr, "%p <- realloc\n", value); */
1066 #endif /* GC_MALLOC_CHECK */
1068 __realloc_hook
= emacs_blocked_realloc
;
1075 /* Called from main to set up malloc to use our hooks. */
1078 uninterrupt_malloc ()
1080 if (__free_hook
!= emacs_blocked_free
)
1081 old_free_hook
= __free_hook
;
1082 __free_hook
= emacs_blocked_free
;
1084 if (__malloc_hook
!= emacs_blocked_malloc
)
1085 old_malloc_hook
= __malloc_hook
;
1086 __malloc_hook
= emacs_blocked_malloc
;
1088 if (__realloc_hook
!= emacs_blocked_realloc
)
1089 old_realloc_hook
= __realloc_hook
;
1090 __realloc_hook
= emacs_blocked_realloc
;
1093 #endif /* not SYSTEM_MALLOC */
1097 /***********************************************************************
1099 ***********************************************************************/
1101 /* Number of intervals allocated in an interval_block structure.
1102 The 1020 is 1024 minus malloc overhead. */
1104 #define INTERVAL_BLOCK_SIZE \
1105 ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval))
1107 /* Intervals are allocated in chunks in form of an interval_block
1110 struct interval_block
1112 /* Place `intervals' first, to preserve alignment. */
1113 struct interval intervals
[INTERVAL_BLOCK_SIZE
];
1114 struct interval_block
*next
;
1117 /* Current interval block. Its `next' pointer points to older
1120 struct interval_block
*interval_block
;
1122 /* Index in interval_block above of the next unused interval
1125 static int interval_block_index
;
1127 /* Number of free and live intervals. */
1129 static int total_free_intervals
, total_intervals
;
1131 /* List of free intervals. */
1133 INTERVAL interval_free_list
;
1135 /* Total number of interval blocks now in use. */
1137 int n_interval_blocks
;
1140 /* Initialize interval allocation. */
1145 interval_block
= NULL
;
1146 interval_block_index
= INTERVAL_BLOCK_SIZE
;
1147 interval_free_list
= 0;
1148 n_interval_blocks
= 0;
1152 /* Return a new interval. */
1159 if (interval_free_list
)
1161 val
= interval_free_list
;
1162 interval_free_list
= INTERVAL_PARENT (interval_free_list
);
1166 if (interval_block_index
== INTERVAL_BLOCK_SIZE
)
1168 register struct interval_block
*newi
;
1170 newi
= (struct interval_block
*) lisp_malloc (sizeof *newi
,
1173 newi
->next
= interval_block
;
1174 interval_block
= newi
;
1175 interval_block_index
= 0;
1176 n_interval_blocks
++;
1178 val
= &interval_block
->intervals
[interval_block_index
++];
1180 consing_since_gc
+= sizeof (struct interval
);
1182 RESET_INTERVAL (val
);
1188 /* Mark Lisp objects in interval I. */
1191 mark_interval (i
, dummy
)
1192 register INTERVAL i
;
1195 eassert (!i
->gcmarkbit
); /* Intervals are never shared. */
1197 mark_object (i
->plist
);
1201 /* Mark the interval tree rooted in TREE. Don't call this directly;
1202 use the macro MARK_INTERVAL_TREE instead. */
1205 mark_interval_tree (tree
)
1206 register INTERVAL tree
;
1208 /* No need to test if this tree has been marked already; this
1209 function is always called through the MARK_INTERVAL_TREE macro,
1210 which takes care of that. */
1212 traverse_intervals_noorder (tree
, mark_interval
, Qnil
);
1216 /* Mark the interval tree rooted in I. */
1218 #define MARK_INTERVAL_TREE(i) \
1220 if (!NULL_INTERVAL_P (i) && !i->gcmarkbit) \
1221 mark_interval_tree (i); \
1225 #define UNMARK_BALANCE_INTERVALS(i) \
1227 if (! NULL_INTERVAL_P (i)) \
1228 (i) = balance_intervals (i); \
1232 /* Number support. If NO_UNION_TYPE isn't in effect, we
1233 can't create number objects in macros. */
1241 obj
.s
.type
= Lisp_Int
;
1246 /***********************************************************************
1248 ***********************************************************************/
1250 /* Lisp_Strings are allocated in string_block structures. When a new
1251 string_block is allocated, all the Lisp_Strings it contains are
1252 added to a free-list string_free_list. When a new Lisp_String is
1253 needed, it is taken from that list. During the sweep phase of GC,
1254 string_blocks that are entirely free are freed, except two which
1257 String data is allocated from sblock structures. Strings larger
1258 than LARGE_STRING_BYTES, get their own sblock, data for smaller
1259 strings is sub-allocated out of sblocks of size SBLOCK_SIZE.
1261 Sblocks consist internally of sdata structures, one for each
1262 Lisp_String. The sdata structure points to the Lisp_String it
1263 belongs to. The Lisp_String points back to the `u.data' member of
1264 its sdata structure.
1266 When a Lisp_String is freed during GC, it is put back on
1267 string_free_list, and its `data' member and its sdata's `string'
1268 pointer is set to null. The size of the string is recorded in the
1269 `u.nbytes' member of the sdata. So, sdata structures that are no
1270 longer used, can be easily recognized, and it's easy to compact the
1271 sblocks of small strings which we do in compact_small_strings. */
1273 /* Size in bytes of an sblock structure used for small strings. This
1274 is 8192 minus malloc overhead. */
1276 #define SBLOCK_SIZE 8188
1278 /* Strings larger than this are considered large strings. String data
1279 for large strings is allocated from individual sblocks. */
1281 #define LARGE_STRING_BYTES 1024
1283 /* Structure describing string memory sub-allocated from an sblock.
1284 This is where the contents of Lisp strings are stored. */
1288 /* Back-pointer to the string this sdata belongs to. If null, this
1289 structure is free, and the NBYTES member of the union below
1290 contains the string's byte size (the same value that STRING_BYTES
1291 would return if STRING were non-null). If non-null, STRING_BYTES
1292 (STRING) is the size of the data, and DATA contains the string's
1294 struct Lisp_String
*string
;
1296 #ifdef GC_CHECK_STRING_BYTES
1299 unsigned char data
[1];
1301 #define SDATA_NBYTES(S) (S)->nbytes
1302 #define SDATA_DATA(S) (S)->data
1304 #else /* not GC_CHECK_STRING_BYTES */
1308 /* When STRING in non-null. */
1309 unsigned char data
[1];
1311 /* When STRING is null. */
1316 #define SDATA_NBYTES(S) (S)->u.nbytes
1317 #define SDATA_DATA(S) (S)->u.data
1319 #endif /* not GC_CHECK_STRING_BYTES */
1323 /* Structure describing a block of memory which is sub-allocated to
1324 obtain string data memory for strings. Blocks for small strings
1325 are of fixed size SBLOCK_SIZE. Blocks for large strings are made
1326 as large as needed. */
1331 struct sblock
*next
;
1333 /* Pointer to the next free sdata block. This points past the end
1334 of the sblock if there isn't any space left in this block. */
1335 struct sdata
*next_free
;
1337 /* Start of data. */
1338 struct sdata first_data
;
1341 /* Number of Lisp strings in a string_block structure. The 1020 is
1342 1024 minus malloc overhead. */
1344 #define STRING_BLOCK_SIZE \
1345 ((1020 - sizeof (struct string_block *)) / sizeof (struct Lisp_String))
1347 /* Structure describing a block from which Lisp_String structures
1352 /* Place `strings' first, to preserve alignment. */
1353 struct Lisp_String strings
[STRING_BLOCK_SIZE
];
1354 struct string_block
*next
;
1357 /* Head and tail of the list of sblock structures holding Lisp string
1358 data. We always allocate from current_sblock. The NEXT pointers
1359 in the sblock structures go from oldest_sblock to current_sblock. */
1361 static struct sblock
*oldest_sblock
, *current_sblock
;
1363 /* List of sblocks for large strings. */
1365 static struct sblock
*large_sblocks
;
1367 /* List of string_block structures, and how many there are. */
1369 static struct string_block
*string_blocks
;
1370 static int n_string_blocks
;
1372 /* Free-list of Lisp_Strings. */
1374 static struct Lisp_String
*string_free_list
;
1376 /* Number of live and free Lisp_Strings. */
1378 static int total_strings
, total_free_strings
;
1380 /* Number of bytes used by live strings. */
1382 static int total_string_size
;
1384 /* Given a pointer to a Lisp_String S which is on the free-list
1385 string_free_list, return a pointer to its successor in the
1388 #define NEXT_FREE_LISP_STRING(S) (*(struct Lisp_String **) (S))
1390 /* Return a pointer to the sdata structure belonging to Lisp string S.
1391 S must be live, i.e. S->data must not be null. S->data is actually
1392 a pointer to the `u.data' member of its sdata structure; the
1393 structure starts at a constant offset in front of that. */
1395 #ifdef GC_CHECK_STRING_BYTES
1397 #define SDATA_OF_STRING(S) \
1398 ((struct sdata *) ((S)->data - sizeof (struct Lisp_String *) \
1399 - sizeof (EMACS_INT)))
1401 #else /* not GC_CHECK_STRING_BYTES */
1403 #define SDATA_OF_STRING(S) \
1404 ((struct sdata *) ((S)->data - sizeof (struct Lisp_String *)))
1406 #endif /* not GC_CHECK_STRING_BYTES */
1408 /* Value is the size of an sdata structure large enough to hold NBYTES
1409 bytes of string data. The value returned includes a terminating
1410 NUL byte, the size of the sdata structure, and padding. */
1412 #ifdef GC_CHECK_STRING_BYTES
1414 #define SDATA_SIZE(NBYTES) \
1415 ((sizeof (struct Lisp_String *) \
1417 + sizeof (EMACS_INT) \
1418 + sizeof (EMACS_INT) - 1) \
1419 & ~(sizeof (EMACS_INT) - 1))
1421 #else /* not GC_CHECK_STRING_BYTES */
1423 #define SDATA_SIZE(NBYTES) \
1424 ((sizeof (struct Lisp_String *) \
1426 + sizeof (EMACS_INT) - 1) \
1427 & ~(sizeof (EMACS_INT) - 1))
1429 #endif /* not GC_CHECK_STRING_BYTES */
1431 /* Initialize string allocation. Called from init_alloc_once. */
1436 total_strings
= total_free_strings
= total_string_size
= 0;
1437 oldest_sblock
= current_sblock
= large_sblocks
= NULL
;
1438 string_blocks
= NULL
;
1439 n_string_blocks
= 0;
1440 string_free_list
= NULL
;
1444 #ifdef GC_CHECK_STRING_BYTES
1446 static int check_string_bytes_count
;
1448 void check_string_bytes
P_ ((int));
1449 void check_sblock
P_ ((struct sblock
*));
1451 #define CHECK_STRING_BYTES(S) STRING_BYTES (S)
1454 /* Like GC_STRING_BYTES, but with debugging check. */
1458 struct Lisp_String
*s
;
1460 int nbytes
= (s
->size_byte
< 0 ? s
->size
& ~ARRAY_MARK_FLAG
: s
->size_byte
);
1461 if (!PURE_POINTER_P (s
)
1463 && nbytes
!= SDATA_NBYTES (SDATA_OF_STRING (s
)))
1468 /* Check validity of Lisp strings' string_bytes member in B. */
1474 struct sdata
*from
, *end
, *from_end
;
1478 for (from
= &b
->first_data
; from
< end
; from
= from_end
)
1480 /* Compute the next FROM here because copying below may
1481 overwrite data we need to compute it. */
1484 /* Check that the string size recorded in the string is the
1485 same as the one recorded in the sdata structure. */
1487 CHECK_STRING_BYTES (from
->string
);
1490 nbytes
= GC_STRING_BYTES (from
->string
);
1492 nbytes
= SDATA_NBYTES (from
);
1494 nbytes
= SDATA_SIZE (nbytes
);
1495 from_end
= (struct sdata
*) ((char *) from
+ nbytes
);
1500 /* Check validity of Lisp strings' string_bytes member. ALL_P
1501 non-zero means check all strings, otherwise check only most
1502 recently allocated strings. Used for hunting a bug. */
1505 check_string_bytes (all_p
)
1512 for (b
= large_sblocks
; b
; b
= b
->next
)
1514 struct Lisp_String
*s
= b
->first_data
.string
;
1516 CHECK_STRING_BYTES (s
);
1519 for (b
= oldest_sblock
; b
; b
= b
->next
)
1523 check_sblock (current_sblock
);
1526 #endif /* GC_CHECK_STRING_BYTES */
1529 /* Return a new Lisp_String. */
1531 static struct Lisp_String
*
1534 struct Lisp_String
*s
;
1536 /* If the free-list is empty, allocate a new string_block, and
1537 add all the Lisp_Strings in it to the free-list. */
1538 if (string_free_list
== NULL
)
1540 struct string_block
*b
;
1543 b
= (struct string_block
*) lisp_malloc (sizeof *b
, MEM_TYPE_STRING
);
1544 bzero (b
, sizeof *b
);
1545 b
->next
= string_blocks
;
1549 for (i
= STRING_BLOCK_SIZE
- 1; i
>= 0; --i
)
1552 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
1553 string_free_list
= s
;
1556 total_free_strings
+= STRING_BLOCK_SIZE
;
1559 /* Pop a Lisp_String off the free-list. */
1560 s
= string_free_list
;
1561 string_free_list
= NEXT_FREE_LISP_STRING (s
);
1563 /* Probably not strictly necessary, but play it safe. */
1564 bzero (s
, sizeof *s
);
1566 --total_free_strings
;
1569 consing_since_gc
+= sizeof *s
;
1571 #ifdef GC_CHECK_STRING_BYTES
1578 if (++check_string_bytes_count
== 200)
1580 check_string_bytes_count
= 0;
1581 check_string_bytes (1);
1584 check_string_bytes (0);
1586 #endif /* GC_CHECK_STRING_BYTES */
1592 /* Set up Lisp_String S for holding NCHARS characters, NBYTES bytes,
1593 plus a NUL byte at the end. Allocate an sdata structure for S, and
1594 set S->data to its `u.data' member. Store a NUL byte at the end of
1595 S->data. Set S->size to NCHARS and S->size_byte to NBYTES. Free
1596 S->data if it was initially non-null. */
1599 allocate_string_data (s
, nchars
, nbytes
)
1600 struct Lisp_String
*s
;
1603 struct sdata
*data
, *old_data
;
1605 int needed
, old_nbytes
;
1607 /* Determine the number of bytes needed to store NBYTES bytes
1609 needed
= SDATA_SIZE (nbytes
);
1611 if (nbytes
> LARGE_STRING_BYTES
)
1613 size_t size
= sizeof *b
- sizeof (struct sdata
) + needed
;
1615 #ifdef DOUG_LEA_MALLOC
1616 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
1617 because mapped region contents are not preserved in
1620 In case you think of allowing it in a dumped Emacs at the
1621 cost of not being able to re-dump, there's another reason:
1622 mmap'ed data typically have an address towards the top of the
1623 address space, which won't fit into an EMACS_INT (at least on
1624 32-bit systems with the current tagging scheme). --fx */
1625 mallopt (M_MMAP_MAX
, 0);
1628 b
= (struct sblock
*) lisp_malloc (size
, MEM_TYPE_NON_LISP
);
1630 #ifdef DOUG_LEA_MALLOC
1631 /* Back to a reasonable maximum of mmap'ed areas. */
1632 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
1635 b
->next_free
= &b
->first_data
;
1636 b
->first_data
.string
= NULL
;
1637 b
->next
= large_sblocks
;
1640 else if (current_sblock
== NULL
1641 || (((char *) current_sblock
+ SBLOCK_SIZE
1642 - (char *) current_sblock
->next_free
)
1645 /* Not enough room in the current sblock. */
1646 b
= (struct sblock
*) lisp_malloc (SBLOCK_SIZE
, MEM_TYPE_NON_LISP
);
1647 b
->next_free
= &b
->first_data
;
1648 b
->first_data
.string
= NULL
;
1652 current_sblock
->next
= b
;
1660 old_data
= s
->data
? SDATA_OF_STRING (s
) : NULL
;
1661 old_nbytes
= GC_STRING_BYTES (s
);
1663 data
= b
->next_free
;
1665 s
->data
= SDATA_DATA (data
);
1666 #ifdef GC_CHECK_STRING_BYTES
1667 SDATA_NBYTES (data
) = nbytes
;
1670 s
->size_byte
= nbytes
;
1671 s
->data
[nbytes
] = '\0';
1672 b
->next_free
= (struct sdata
*) ((char *) data
+ needed
);
1674 /* If S had already data assigned, mark that as free by setting its
1675 string back-pointer to null, and recording the size of the data
1679 SDATA_NBYTES (old_data
) = old_nbytes
;
1680 old_data
->string
= NULL
;
1683 consing_since_gc
+= needed
;
1687 /* Sweep and compact strings. */
1692 struct string_block
*b
, *next
;
1693 struct string_block
*live_blocks
= NULL
;
1695 string_free_list
= NULL
;
1696 total_strings
= total_free_strings
= 0;
1697 total_string_size
= 0;
1699 /* Scan strings_blocks, free Lisp_Strings that aren't marked. */
1700 for (b
= string_blocks
; b
; b
= next
)
1703 struct Lisp_String
*free_list_before
= string_free_list
;
1707 for (i
= 0; i
< STRING_BLOCK_SIZE
; ++i
)
1709 struct Lisp_String
*s
= b
->strings
+ i
;
1713 /* String was not on free-list before. */
1714 if (STRING_MARKED_P (s
))
1716 /* String is live; unmark it and its intervals. */
1719 if (!NULL_INTERVAL_P (s
->intervals
))
1720 UNMARK_BALANCE_INTERVALS (s
->intervals
);
1723 total_string_size
+= STRING_BYTES (s
);
1727 /* String is dead. Put it on the free-list. */
1728 struct sdata
*data
= SDATA_OF_STRING (s
);
1730 /* Save the size of S in its sdata so that we know
1731 how large that is. Reset the sdata's string
1732 back-pointer so that we know it's free. */
1733 #ifdef GC_CHECK_STRING_BYTES
1734 if (GC_STRING_BYTES (s
) != SDATA_NBYTES (data
))
1737 data
->u
.nbytes
= GC_STRING_BYTES (s
);
1739 data
->string
= NULL
;
1741 /* Reset the strings's `data' member so that we
1745 /* Put the string on the free-list. */
1746 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
1747 string_free_list
= s
;
1753 /* S was on the free-list before. Put it there again. */
1754 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
1755 string_free_list
= s
;
1760 /* Free blocks that contain free Lisp_Strings only, except
1761 the first two of them. */
1762 if (nfree
== STRING_BLOCK_SIZE
1763 && total_free_strings
> STRING_BLOCK_SIZE
)
1767 string_free_list
= free_list_before
;
1771 total_free_strings
+= nfree
;
1772 b
->next
= live_blocks
;
1777 string_blocks
= live_blocks
;
1778 free_large_strings ();
1779 compact_small_strings ();
1783 /* Free dead large strings. */
1786 free_large_strings ()
1788 struct sblock
*b
, *next
;
1789 struct sblock
*live_blocks
= NULL
;
1791 for (b
= large_sblocks
; b
; b
= next
)
1795 if (b
->first_data
.string
== NULL
)
1799 b
->next
= live_blocks
;
1804 large_sblocks
= live_blocks
;
1808 /* Compact data of small strings. Free sblocks that don't contain
1809 data of live strings after compaction. */
1812 compact_small_strings ()
1814 struct sblock
*b
, *tb
, *next
;
1815 struct sdata
*from
, *to
, *end
, *tb_end
;
1816 struct sdata
*to_end
, *from_end
;
1818 /* TB is the sblock we copy to, TO is the sdata within TB we copy
1819 to, and TB_END is the end of TB. */
1821 tb_end
= (struct sdata
*) ((char *) tb
+ SBLOCK_SIZE
);
1822 to
= &tb
->first_data
;
1824 /* Step through the blocks from the oldest to the youngest. We
1825 expect that old blocks will stabilize over time, so that less
1826 copying will happen this way. */
1827 for (b
= oldest_sblock
; b
; b
= b
->next
)
1830 xassert ((char *) end
<= (char *) b
+ SBLOCK_SIZE
);
1832 for (from
= &b
->first_data
; from
< end
; from
= from_end
)
1834 /* Compute the next FROM here because copying below may
1835 overwrite data we need to compute it. */
1838 #ifdef GC_CHECK_STRING_BYTES
1839 /* Check that the string size recorded in the string is the
1840 same as the one recorded in the sdata structure. */
1842 && GC_STRING_BYTES (from
->string
) != SDATA_NBYTES (from
))
1844 #endif /* GC_CHECK_STRING_BYTES */
1847 nbytes
= GC_STRING_BYTES (from
->string
);
1849 nbytes
= SDATA_NBYTES (from
);
1851 nbytes
= SDATA_SIZE (nbytes
);
1852 from_end
= (struct sdata
*) ((char *) from
+ nbytes
);
1854 /* FROM->string non-null means it's alive. Copy its data. */
1857 /* If TB is full, proceed with the next sblock. */
1858 to_end
= (struct sdata
*) ((char *) to
+ nbytes
);
1859 if (to_end
> tb_end
)
1863 tb_end
= (struct sdata
*) ((char *) tb
+ SBLOCK_SIZE
);
1864 to
= &tb
->first_data
;
1865 to_end
= (struct sdata
*) ((char *) to
+ nbytes
);
1868 /* Copy, and update the string's `data' pointer. */
1871 xassert (tb
!= b
|| to
<= from
);
1872 safe_bcopy ((char *) from
, (char *) to
, nbytes
);
1873 to
->string
->data
= SDATA_DATA (to
);
1876 /* Advance past the sdata we copied to. */
1882 /* The rest of the sblocks following TB don't contain live data, so
1883 we can free them. */
1884 for (b
= tb
->next
; b
; b
= next
)
1892 current_sblock
= tb
;
1896 DEFUN ("make-string", Fmake_string
, Smake_string
, 2, 2, 0,
1897 doc
: /* Return a newly created string of length LENGTH, with each element being INIT.
1898 Both LENGTH and INIT must be numbers. */)
1900 Lisp_Object length
, init
;
1902 register Lisp_Object val
;
1903 register unsigned char *p
, *end
;
1906 CHECK_NATNUM (length
);
1907 CHECK_NUMBER (init
);
1910 if (SINGLE_BYTE_CHAR_P (c
))
1912 nbytes
= XINT (length
);
1913 val
= make_uninit_string (nbytes
);
1915 end
= p
+ SCHARS (val
);
1921 unsigned char str
[MAX_MULTIBYTE_LENGTH
];
1922 int len
= CHAR_STRING (c
, str
);
1924 nbytes
= len
* XINT (length
);
1925 val
= make_uninit_multibyte_string (XINT (length
), nbytes
);
1930 bcopy (str
, p
, len
);
1940 DEFUN ("make-bool-vector", Fmake_bool_vector
, Smake_bool_vector
, 2, 2, 0,
1941 doc
: /* Return a new bool-vector of length LENGTH, using INIT for as each element.
1942 LENGTH must be a number. INIT matters only in whether it is t or nil. */)
1944 Lisp_Object length
, init
;
1946 register Lisp_Object val
;
1947 struct Lisp_Bool_Vector
*p
;
1949 int length_in_chars
, length_in_elts
, bits_per_value
;
1951 CHECK_NATNUM (length
);
1953 bits_per_value
= sizeof (EMACS_INT
) * BOOL_VECTOR_BITS_PER_CHAR
;
1955 length_in_elts
= (XFASTINT (length
) + bits_per_value
- 1) / bits_per_value
;
1956 length_in_chars
= ((XFASTINT (length
) + BOOL_VECTOR_BITS_PER_CHAR
- 1)
1957 / BOOL_VECTOR_BITS_PER_CHAR
);
1959 /* We must allocate one more elements than LENGTH_IN_ELTS for the
1960 slot `size' of the struct Lisp_Bool_Vector. */
1961 val
= Fmake_vector (make_number (length_in_elts
+ 1), Qnil
);
1962 p
= XBOOL_VECTOR (val
);
1964 /* Get rid of any bits that would cause confusion. */
1966 XSETBOOL_VECTOR (val
, p
);
1967 p
->size
= XFASTINT (length
);
1969 real_init
= (NILP (init
) ? 0 : -1);
1970 for (i
= 0; i
< length_in_chars
; i
++)
1971 p
->data
[i
] = real_init
;
1973 /* Clear the extraneous bits in the last byte. */
1974 if (XINT (length
) != length_in_chars
* BOOL_VECTOR_BITS_PER_CHAR
)
1975 XBOOL_VECTOR (val
)->data
[length_in_chars
- 1]
1976 &= (1 << (XINT (length
) % BOOL_VECTOR_BITS_PER_CHAR
)) - 1;
1982 /* Make a string from NBYTES bytes at CONTENTS, and compute the number
1983 of characters from the contents. This string may be unibyte or
1984 multibyte, depending on the contents. */
1987 make_string (contents
, nbytes
)
1988 const char *contents
;
1991 register Lisp_Object val
;
1992 int nchars
, multibyte_nbytes
;
1994 parse_str_as_multibyte (contents
, nbytes
, &nchars
, &multibyte_nbytes
);
1995 if (nbytes
== nchars
|| nbytes
!= multibyte_nbytes
)
1996 /* CONTENTS contains no multibyte sequences or contains an invalid
1997 multibyte sequence. We must make unibyte string. */
1998 val
= make_unibyte_string (contents
, nbytes
);
2000 val
= make_multibyte_string (contents
, nchars
, nbytes
);
2005 /* Make an unibyte string from LENGTH bytes at CONTENTS. */
2008 make_unibyte_string (contents
, length
)
2009 const char *contents
;
2012 register Lisp_Object val
;
2013 val
= make_uninit_string (length
);
2014 bcopy (contents
, SDATA (val
), length
);
2015 STRING_SET_UNIBYTE (val
);
2020 /* Make a multibyte string from NCHARS characters occupying NBYTES
2021 bytes at CONTENTS. */
2024 make_multibyte_string (contents
, nchars
, nbytes
)
2025 const char *contents
;
2028 register Lisp_Object val
;
2029 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2030 bcopy (contents
, SDATA (val
), nbytes
);
2035 /* Make a string from NCHARS characters occupying NBYTES bytes at
2036 CONTENTS. It is a multibyte string if NBYTES != NCHARS. */
2039 make_string_from_bytes (contents
, nchars
, nbytes
)
2040 const char *contents
;
2043 register Lisp_Object val
;
2044 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2045 bcopy (contents
, SDATA (val
), nbytes
);
2046 if (SBYTES (val
) == SCHARS (val
))
2047 STRING_SET_UNIBYTE (val
);
2052 /* Make a string from NCHARS characters occupying NBYTES bytes at
2053 CONTENTS. The argument MULTIBYTE controls whether to label the
2054 string as multibyte. If NCHARS is negative, it counts the number of
2055 characters by itself. */
2058 make_specified_string (contents
, nchars
, nbytes
, multibyte
)
2059 const char *contents
;
2063 register Lisp_Object val
;
2068 nchars
= multibyte_chars_in_text (contents
, nbytes
);
2072 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2073 bcopy (contents
, SDATA (val
), nbytes
);
2075 STRING_SET_UNIBYTE (val
);
2080 /* Make a string from the data at STR, treating it as multibyte if the
2087 return make_string (str
, strlen (str
));
2091 /* Return an unibyte Lisp_String set up to hold LENGTH characters
2092 occupying LENGTH bytes. */
2095 make_uninit_string (length
)
2099 val
= make_uninit_multibyte_string (length
, length
);
2100 STRING_SET_UNIBYTE (val
);
2105 /* Return a multibyte Lisp_String set up to hold NCHARS characters
2106 which occupy NBYTES bytes. */
2109 make_uninit_multibyte_string (nchars
, nbytes
)
2113 struct Lisp_String
*s
;
2118 s
= allocate_string ();
2119 allocate_string_data (s
, nchars
, nbytes
);
2120 XSETSTRING (string
, s
);
2121 string_chars_consed
+= nbytes
;
2127 /***********************************************************************
2129 ***********************************************************************/
2131 /* We store float cells inside of float_blocks, allocating a new
2132 float_block with malloc whenever necessary. Float cells reclaimed
2133 by GC are put on a free list to be reallocated before allocating
2134 any new float cells from the latest float_block. */
2136 #define FLOAT_BLOCK_SIZE \
2137 (((BLOCK_BYTES - sizeof (struct float_block *) \
2138 /* The compiler might add padding at the end. */ \
2139 - (sizeof (struct Lisp_Float) - sizeof (int))) * CHAR_BIT) \
2140 / (sizeof (struct Lisp_Float) * CHAR_BIT + 1))
2142 #define GETMARKBIT(block,n) \
2143 (((block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2144 >> ((n) % (sizeof(int) * CHAR_BIT))) \
2147 #define SETMARKBIT(block,n) \
2148 (block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2149 |= 1 << ((n) % (sizeof(int) * CHAR_BIT))
2151 #define UNSETMARKBIT(block,n) \
2152 (block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2153 &= ~(1 << ((n) % (sizeof(int) * CHAR_BIT)))
2155 #define FLOAT_BLOCK(fptr) \
2156 ((struct float_block *)(((EMACS_UINT)(fptr)) & ~(BLOCK_ALIGN - 1)))
2158 #define FLOAT_INDEX(fptr) \
2159 ((((EMACS_UINT)(fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Float))
2163 /* Place `floats' at the beginning, to ease up FLOAT_INDEX's job. */
2164 struct Lisp_Float floats
[FLOAT_BLOCK_SIZE
];
2165 int gcmarkbits
[1 + FLOAT_BLOCK_SIZE
/ (sizeof(int) * CHAR_BIT
)];
2166 struct float_block
*next
;
2169 #define FLOAT_MARKED_P(fptr) \
2170 GETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2172 #define FLOAT_MARK(fptr) \
2173 SETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2175 #define FLOAT_UNMARK(fptr) \
2176 UNSETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2178 /* Current float_block. */
2180 struct float_block
*float_block
;
2182 /* Index of first unused Lisp_Float in the current float_block. */
2184 int float_block_index
;
2186 /* Total number of float blocks now in use. */
2190 /* Free-list of Lisp_Floats. */
2192 struct Lisp_Float
*float_free_list
;
2195 /* Initialize float allocation. */
2201 float_block_index
= FLOAT_BLOCK_SIZE
; /* Force alloc of new float_block. */
2202 float_free_list
= 0;
2207 /* Explicitly free a float cell by putting it on the free-list. */
2211 struct Lisp_Float
*ptr
;
2213 *(struct Lisp_Float
**)&ptr
->data
= float_free_list
;
2214 float_free_list
= ptr
;
2218 /* Return a new float object with value FLOAT_VALUE. */
2221 make_float (float_value
)
2224 register Lisp_Object val
;
2226 if (float_free_list
)
2228 /* We use the data field for chaining the free list
2229 so that we won't use the same field that has the mark bit. */
2230 XSETFLOAT (val
, float_free_list
);
2231 float_free_list
= *(struct Lisp_Float
**)&float_free_list
->data
;
2235 if (float_block_index
== FLOAT_BLOCK_SIZE
)
2237 register struct float_block
*new;
2239 new = (struct float_block
*) lisp_align_malloc (sizeof *new,
2241 new->next
= float_block
;
2242 bzero ((char *) new->gcmarkbits
, sizeof new->gcmarkbits
);
2244 float_block_index
= 0;
2247 XSETFLOAT (val
, &float_block
->floats
[float_block_index
]);
2248 float_block_index
++;
2251 XFLOAT_DATA (val
) = float_value
;
2252 eassert (!FLOAT_MARKED_P (XFLOAT (val
)));
2253 consing_since_gc
+= sizeof (struct Lisp_Float
);
2260 /***********************************************************************
2262 ***********************************************************************/
2264 /* We store cons cells inside of cons_blocks, allocating a new
2265 cons_block with malloc whenever necessary. Cons cells reclaimed by
2266 GC are put on a free list to be reallocated before allocating
2267 any new cons cells from the latest cons_block. */
2269 #define CONS_BLOCK_SIZE \
2270 (((BLOCK_BYTES - sizeof (struct cons_block *)) * CHAR_BIT) \
2271 / (sizeof (struct Lisp_Cons) * CHAR_BIT + 1))
2273 #define CONS_BLOCK(fptr) \
2274 ((struct cons_block *)(((EMACS_UINT)(fptr)) & ~(BLOCK_ALIGN - 1)))
2276 #define CONS_INDEX(fptr) \
2277 ((((EMACS_UINT)(fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Cons))
2281 /* Place `conses' at the beginning, to ease up CONS_INDEX's job. */
2282 struct Lisp_Cons conses
[CONS_BLOCK_SIZE
];
2283 int gcmarkbits
[1 + CONS_BLOCK_SIZE
/ (sizeof(int) * CHAR_BIT
)];
2284 struct cons_block
*next
;
2287 #define CONS_MARKED_P(fptr) \
2288 GETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2290 #define CONS_MARK(fptr) \
2291 SETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2293 #define CONS_UNMARK(fptr) \
2294 UNSETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2296 /* Current cons_block. */
2298 struct cons_block
*cons_block
;
2300 /* Index of first unused Lisp_Cons in the current block. */
2302 int cons_block_index
;
2304 /* Free-list of Lisp_Cons structures. */
2306 struct Lisp_Cons
*cons_free_list
;
2308 /* Total number of cons blocks now in use. */
2313 /* Initialize cons allocation. */
2319 cons_block_index
= CONS_BLOCK_SIZE
; /* Force alloc of new cons_block. */
2325 /* Explicitly free a cons cell by putting it on the free-list. */
2329 struct Lisp_Cons
*ptr
;
2331 *(struct Lisp_Cons
**)&ptr
->cdr
= cons_free_list
;
2335 cons_free_list
= ptr
;
2339 DEFUN ("cons", Fcons
, Scons
, 2, 2, 0,
2340 doc
: /* Create a new cons, give it CAR and CDR as components, and return it. */)
2342 Lisp_Object car
, cdr
;
2344 register Lisp_Object val
;
2348 /* We use the cdr for chaining the free list
2349 so that we won't use the same field that has the mark bit. */
2350 XSETCONS (val
, cons_free_list
);
2351 cons_free_list
= *(struct Lisp_Cons
**)&cons_free_list
->cdr
;
2355 if (cons_block_index
== CONS_BLOCK_SIZE
)
2357 register struct cons_block
*new;
2358 new = (struct cons_block
*) lisp_align_malloc (sizeof *new,
2360 bzero ((char *) new->gcmarkbits
, sizeof new->gcmarkbits
);
2361 new->next
= cons_block
;
2363 cons_block_index
= 0;
2366 XSETCONS (val
, &cons_block
->conses
[cons_block_index
]);
2372 eassert (!CONS_MARKED_P (XCONS (val
)));
2373 consing_since_gc
+= sizeof (struct Lisp_Cons
);
2374 cons_cells_consed
++;
2379 /* Make a list of 2, 3, 4 or 5 specified objects. */
2383 Lisp_Object arg1
, arg2
;
2385 return Fcons (arg1
, Fcons (arg2
, Qnil
));
2390 list3 (arg1
, arg2
, arg3
)
2391 Lisp_Object arg1
, arg2
, arg3
;
2393 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Qnil
)));
2398 list4 (arg1
, arg2
, arg3
, arg4
)
2399 Lisp_Object arg1
, arg2
, arg3
, arg4
;
2401 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Fcons (arg4
, Qnil
))));
2406 list5 (arg1
, arg2
, arg3
, arg4
, arg5
)
2407 Lisp_Object arg1
, arg2
, arg3
, arg4
, arg5
;
2409 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Fcons (arg4
,
2410 Fcons (arg5
, Qnil
)))));
2414 DEFUN ("list", Flist
, Slist
, 0, MANY
, 0,
2415 doc
: /* Return a newly created list with specified arguments as elements.
2416 Any number of arguments, even zero arguments, are allowed.
2417 usage: (list &rest OBJECTS) */)
2420 register Lisp_Object
*args
;
2422 register Lisp_Object val
;
2428 val
= Fcons (args
[nargs
], val
);
2434 DEFUN ("make-list", Fmake_list
, Smake_list
, 2, 2, 0,
2435 doc
: /* Return a newly created list of length LENGTH, with each element being INIT. */)
2437 register Lisp_Object length
, init
;
2439 register Lisp_Object val
;
2442 CHECK_NATNUM (length
);
2443 size
= XFASTINT (length
);
2448 val
= Fcons (init
, val
);
2453 val
= Fcons (init
, val
);
2458 val
= Fcons (init
, val
);
2463 val
= Fcons (init
, val
);
2468 val
= Fcons (init
, val
);
2483 /***********************************************************************
2485 ***********************************************************************/
2487 /* Singly-linked list of all vectors. */
2489 struct Lisp_Vector
*all_vectors
;
2491 /* Total number of vector-like objects now in use. */
2496 /* Value is a pointer to a newly allocated Lisp_Vector structure
2497 with room for LEN Lisp_Objects. */
2499 static struct Lisp_Vector
*
2500 allocate_vectorlike (len
, type
)
2504 struct Lisp_Vector
*p
;
2507 #ifdef DOUG_LEA_MALLOC
2508 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
2509 because mapped region contents are not preserved in
2512 mallopt (M_MMAP_MAX
, 0);
2516 nbytes
= sizeof *p
+ (len
- 1) * sizeof p
->contents
[0];
2517 p
= (struct Lisp_Vector
*) lisp_malloc (nbytes
, type
);
2519 #ifdef DOUG_LEA_MALLOC
2520 /* Back to a reasonable maximum of mmap'ed areas. */
2522 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
2526 consing_since_gc
+= nbytes
;
2527 vector_cells_consed
+= len
;
2529 p
->next
= all_vectors
;
2536 /* Allocate a vector with NSLOTS slots. */
2538 struct Lisp_Vector
*
2539 allocate_vector (nslots
)
2542 struct Lisp_Vector
*v
= allocate_vectorlike (nslots
, MEM_TYPE_VECTOR
);
2548 /* Allocate other vector-like structures. */
2550 struct Lisp_Hash_Table
*
2551 allocate_hash_table ()
2553 EMACS_INT len
= VECSIZE (struct Lisp_Hash_Table
);
2554 struct Lisp_Vector
*v
= allocate_vectorlike (len
, MEM_TYPE_HASH_TABLE
);
2558 for (i
= 0; i
< len
; ++i
)
2559 v
->contents
[i
] = Qnil
;
2561 return (struct Lisp_Hash_Table
*) v
;
2568 EMACS_INT len
= VECSIZE (struct window
);
2569 struct Lisp_Vector
*v
= allocate_vectorlike (len
, MEM_TYPE_WINDOW
);
2572 for (i
= 0; i
< len
; ++i
)
2573 v
->contents
[i
] = Qnil
;
2576 return (struct window
*) v
;
2583 EMACS_INT len
= VECSIZE (struct frame
);
2584 struct Lisp_Vector
*v
= allocate_vectorlike (len
, MEM_TYPE_FRAME
);
2587 for (i
= 0; i
< len
; ++i
)
2588 v
->contents
[i
] = make_number (0);
2590 return (struct frame
*) v
;
2594 struct Lisp_Process
*
2597 EMACS_INT len
= VECSIZE (struct Lisp_Process
);
2598 struct Lisp_Vector
*v
= allocate_vectorlike (len
, MEM_TYPE_PROCESS
);
2601 for (i
= 0; i
< len
; ++i
)
2602 v
->contents
[i
] = Qnil
;
2605 return (struct Lisp_Process
*) v
;
2609 struct Lisp_Vector
*
2610 allocate_other_vector (len
)
2613 struct Lisp_Vector
*v
= allocate_vectorlike (len
, MEM_TYPE_VECTOR
);
2616 for (i
= 0; i
< len
; ++i
)
2617 v
->contents
[i
] = Qnil
;
2624 DEFUN ("make-vector", Fmake_vector
, Smake_vector
, 2, 2, 0,
2625 doc
: /* Return a newly created vector of length LENGTH, with each element being INIT.
2626 See also the function `vector'. */)
2628 register Lisp_Object length
, init
;
2631 register EMACS_INT sizei
;
2633 register struct Lisp_Vector
*p
;
2635 CHECK_NATNUM (length
);
2636 sizei
= XFASTINT (length
);
2638 p
= allocate_vector (sizei
);
2639 for (index
= 0; index
< sizei
; index
++)
2640 p
->contents
[index
] = init
;
2642 XSETVECTOR (vector
, p
);
2647 DEFUN ("make-char-table", Fmake_char_table
, Smake_char_table
, 1, 2, 0,
2648 doc
: /* Return a newly created char-table, with purpose PURPOSE.
2649 Each element is initialized to INIT, which defaults to nil.
2650 PURPOSE should be a symbol which has a `char-table-extra-slots' property.
2651 The property's value should be an integer between 0 and 10. */)
2653 register Lisp_Object purpose
, init
;
2657 CHECK_SYMBOL (purpose
);
2658 n
= Fget (purpose
, Qchar_table_extra_slots
);
2660 if (XINT (n
) < 0 || XINT (n
) > 10)
2661 args_out_of_range (n
, Qnil
);
2662 /* Add 2 to the size for the defalt and parent slots. */
2663 vector
= Fmake_vector (make_number (CHAR_TABLE_STANDARD_SLOTS
+ XINT (n
)),
2665 XCHAR_TABLE (vector
)->top
= Qt
;
2666 XCHAR_TABLE (vector
)->parent
= Qnil
;
2667 XCHAR_TABLE (vector
)->purpose
= purpose
;
2668 XSETCHAR_TABLE (vector
, XCHAR_TABLE (vector
));
2673 /* Return a newly created sub char table with default value DEFALT.
2674 Since a sub char table does not appear as a top level Emacs Lisp
2675 object, we don't need a Lisp interface to make it. */
2678 make_sub_char_table (defalt
)
2682 = Fmake_vector (make_number (SUB_CHAR_TABLE_STANDARD_SLOTS
), Qnil
);
2683 XCHAR_TABLE (vector
)->top
= Qnil
;
2684 XCHAR_TABLE (vector
)->defalt
= defalt
;
2685 XSETCHAR_TABLE (vector
, XCHAR_TABLE (vector
));
2690 DEFUN ("vector", Fvector
, Svector
, 0, MANY
, 0,
2691 doc
: /* Return a newly created vector with specified arguments as elements.
2692 Any number of arguments, even zero arguments, are allowed.
2693 usage: (vector &rest OBJECTS) */)
2698 register Lisp_Object len
, val
;
2700 register struct Lisp_Vector
*p
;
2702 XSETFASTINT (len
, nargs
);
2703 val
= Fmake_vector (len
, Qnil
);
2705 for (index
= 0; index
< nargs
; index
++)
2706 p
->contents
[index
] = args
[index
];
2711 DEFUN ("make-byte-code", Fmake_byte_code
, Smake_byte_code
, 4, MANY
, 0,
2712 doc
: /* Create a byte-code object with specified arguments as elements.
2713 The arguments should be the arglist, bytecode-string, constant vector,
2714 stack size, (optional) doc string, and (optional) interactive spec.
2715 The first four arguments are required; at most six have any
2717 usage: (make-byte-code ARGLIST BYTE-CODE CONSTANTS DEPTH &optional DOCSTRING INTERACTIVE-SPEC &rest ELEMENTS) */)
2722 register Lisp_Object len
, val
;
2724 register struct Lisp_Vector
*p
;
2726 XSETFASTINT (len
, nargs
);
2727 if (!NILP (Vpurify_flag
))
2728 val
= make_pure_vector ((EMACS_INT
) nargs
);
2730 val
= Fmake_vector (len
, Qnil
);
2732 if (STRINGP (args
[1]) && STRING_MULTIBYTE (args
[1]))
2733 /* BYTECODE-STRING must have been produced by Emacs 20.2 or the
2734 earlier because they produced a raw 8-bit string for byte-code
2735 and now such a byte-code string is loaded as multibyte while
2736 raw 8-bit characters converted to multibyte form. Thus, now we
2737 must convert them back to the original unibyte form. */
2738 args
[1] = Fstring_as_unibyte (args
[1]);
2741 for (index
= 0; index
< nargs
; index
++)
2743 if (!NILP (Vpurify_flag
))
2744 args
[index
] = Fpurecopy (args
[index
]);
2745 p
->contents
[index
] = args
[index
];
2747 XSETCOMPILED (val
, p
);
2753 /***********************************************************************
2755 ***********************************************************************/
2757 /* Each symbol_block is just under 1020 bytes long, since malloc
2758 really allocates in units of powers of two and uses 4 bytes for its
2761 #define SYMBOL_BLOCK_SIZE \
2762 ((1020 - sizeof (struct symbol_block *)) / sizeof (struct Lisp_Symbol))
2766 /* Place `symbols' first, to preserve alignment. */
2767 struct Lisp_Symbol symbols
[SYMBOL_BLOCK_SIZE
];
2768 struct symbol_block
*next
;
2771 /* Current symbol block and index of first unused Lisp_Symbol
2774 struct symbol_block
*symbol_block
;
2775 int symbol_block_index
;
2777 /* List of free symbols. */
2779 struct Lisp_Symbol
*symbol_free_list
;
2781 /* Total number of symbol blocks now in use. */
2783 int n_symbol_blocks
;
2786 /* Initialize symbol allocation. */
2791 symbol_block
= NULL
;
2792 symbol_block_index
= SYMBOL_BLOCK_SIZE
;
2793 symbol_free_list
= 0;
2794 n_symbol_blocks
= 0;
2798 DEFUN ("make-symbol", Fmake_symbol
, Smake_symbol
, 1, 1, 0,
2799 doc
: /* Return a newly allocated uninterned symbol whose name is NAME.
2800 Its value and function definition are void, and its property list is nil. */)
2804 register Lisp_Object val
;
2805 register struct Lisp_Symbol
*p
;
2807 CHECK_STRING (name
);
2809 if (symbol_free_list
)
2811 XSETSYMBOL (val
, symbol_free_list
);
2812 symbol_free_list
= *(struct Lisp_Symbol
**)&symbol_free_list
->value
;
2816 if (symbol_block_index
== SYMBOL_BLOCK_SIZE
)
2818 struct symbol_block
*new;
2819 new = (struct symbol_block
*) lisp_malloc (sizeof *new,
2821 new->next
= symbol_block
;
2823 symbol_block_index
= 0;
2826 XSETSYMBOL (val
, &symbol_block
->symbols
[symbol_block_index
]);
2827 symbol_block_index
++;
2833 p
->value
= Qunbound
;
2834 p
->function
= Qunbound
;
2837 p
->interned
= SYMBOL_UNINTERNED
;
2839 p
->indirect_variable
= 0;
2840 consing_since_gc
+= sizeof (struct Lisp_Symbol
);
2847 /***********************************************************************
2848 Marker (Misc) Allocation
2849 ***********************************************************************/
2851 /* Allocation of markers and other objects that share that structure.
2852 Works like allocation of conses. */
2854 #define MARKER_BLOCK_SIZE \
2855 ((1020 - sizeof (struct marker_block *)) / sizeof (union Lisp_Misc))
2859 /* Place `markers' first, to preserve alignment. */
2860 union Lisp_Misc markers
[MARKER_BLOCK_SIZE
];
2861 struct marker_block
*next
;
2864 struct marker_block
*marker_block
;
2865 int marker_block_index
;
2867 union Lisp_Misc
*marker_free_list
;
2869 /* Total number of marker blocks now in use. */
2871 int n_marker_blocks
;
2876 marker_block
= NULL
;
2877 marker_block_index
= MARKER_BLOCK_SIZE
;
2878 marker_free_list
= 0;
2879 n_marker_blocks
= 0;
2882 /* Return a newly allocated Lisp_Misc object, with no substructure. */
2889 if (marker_free_list
)
2891 XSETMISC (val
, marker_free_list
);
2892 marker_free_list
= marker_free_list
->u_free
.chain
;
2896 if (marker_block_index
== MARKER_BLOCK_SIZE
)
2898 struct marker_block
*new;
2899 new = (struct marker_block
*) lisp_malloc (sizeof *new,
2901 new->next
= marker_block
;
2903 marker_block_index
= 0;
2906 XSETMISC (val
, &marker_block
->markers
[marker_block_index
]);
2907 marker_block_index
++;
2910 consing_since_gc
+= sizeof (union Lisp_Misc
);
2911 misc_objects_consed
++;
2912 XMARKER (val
)->gcmarkbit
= 0;
2916 /* Return a Lisp_Misc_Save_Value object containing POINTER and
2917 INTEGER. This is used to package C values to call record_unwind_protect.
2918 The unwind function can get the C values back using XSAVE_VALUE. */
2921 make_save_value (pointer
, integer
)
2925 register Lisp_Object val
;
2926 register struct Lisp_Save_Value
*p
;
2928 val
= allocate_misc ();
2929 XMISCTYPE (val
) = Lisp_Misc_Save_Value
;
2930 p
= XSAVE_VALUE (val
);
2931 p
->pointer
= pointer
;
2932 p
->integer
= integer
;
2936 DEFUN ("make-marker", Fmake_marker
, Smake_marker
, 0, 0, 0,
2937 doc
: /* Return a newly allocated marker which does not point at any place. */)
2940 register Lisp_Object val
;
2941 register struct Lisp_Marker
*p
;
2943 val
= allocate_misc ();
2944 XMISCTYPE (val
) = Lisp_Misc_Marker
;
2950 p
->insertion_type
= 0;
2954 /* Put MARKER back on the free list after using it temporarily. */
2957 free_marker (marker
)
2960 unchain_marker (XMARKER (marker
));
2962 XMISC (marker
)->u_marker
.type
= Lisp_Misc_Free
;
2963 XMISC (marker
)->u_free
.chain
= marker_free_list
;
2964 marker_free_list
= XMISC (marker
);
2966 total_free_markers
++;
2970 /* Return a newly created vector or string with specified arguments as
2971 elements. If all the arguments are characters that can fit
2972 in a string of events, make a string; otherwise, make a vector.
2974 Any number of arguments, even zero arguments, are allowed. */
2977 make_event_array (nargs
, args
)
2983 for (i
= 0; i
< nargs
; i
++)
2984 /* The things that fit in a string
2985 are characters that are in 0...127,
2986 after discarding the meta bit and all the bits above it. */
2987 if (!INTEGERP (args
[i
])
2988 || (XUINT (args
[i
]) & ~(-CHAR_META
)) >= 0200)
2989 return Fvector (nargs
, args
);
2991 /* Since the loop exited, we know that all the things in it are
2992 characters, so we can make a string. */
2996 result
= Fmake_string (make_number (nargs
), make_number (0));
2997 for (i
= 0; i
< nargs
; i
++)
2999 SSET (result
, i
, XINT (args
[i
]));
3000 /* Move the meta bit to the right place for a string char. */
3001 if (XINT (args
[i
]) & CHAR_META
)
3002 SSET (result
, i
, SREF (result
, i
) | 0x80);
3011 /************************************************************************
3013 ************************************************************************/
3015 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
3017 /* Conservative C stack marking requires a method to identify possibly
3018 live Lisp objects given a pointer value. We do this by keeping
3019 track of blocks of Lisp data that are allocated in a red-black tree
3020 (see also the comment of mem_node which is the type of nodes in
3021 that tree). Function lisp_malloc adds information for an allocated
3022 block to the red-black tree with calls to mem_insert, and function
3023 lisp_free removes it with mem_delete. Functions live_string_p etc
3024 call mem_find to lookup information about a given pointer in the
3025 tree, and use that to determine if the pointer points to a Lisp
3028 /* Initialize this part of alloc.c. */
3033 mem_z
.left
= mem_z
.right
= MEM_NIL
;
3034 mem_z
.parent
= NULL
;
3035 mem_z
.color
= MEM_BLACK
;
3036 mem_z
.start
= mem_z
.end
= NULL
;
3041 /* Value is a pointer to the mem_node containing START. Value is
3042 MEM_NIL if there is no node in the tree containing START. */
3044 static INLINE
struct mem_node
*
3050 if (start
< min_heap_address
|| start
> max_heap_address
)
3053 /* Make the search always successful to speed up the loop below. */
3054 mem_z
.start
= start
;
3055 mem_z
.end
= (char *) start
+ 1;
3058 while (start
< p
->start
|| start
>= p
->end
)
3059 p
= start
< p
->start
? p
->left
: p
->right
;
3064 /* Insert a new node into the tree for a block of memory with start
3065 address START, end address END, and type TYPE. Value is a
3066 pointer to the node that was inserted. */
3068 static struct mem_node
*
3069 mem_insert (start
, end
, type
)
3073 struct mem_node
*c
, *parent
, *x
;
3075 if (start
< min_heap_address
)
3076 min_heap_address
= start
;
3077 if (end
> max_heap_address
)
3078 max_heap_address
= end
;
3080 /* See where in the tree a node for START belongs. In this
3081 particular application, it shouldn't happen that a node is already
3082 present. For debugging purposes, let's check that. */
3086 #if GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS
3088 while (c
!= MEM_NIL
)
3090 if (start
>= c
->start
&& start
< c
->end
)
3093 c
= start
< c
->start
? c
->left
: c
->right
;
3096 #else /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */
3098 while (c
!= MEM_NIL
)
3101 c
= start
< c
->start
? c
->left
: c
->right
;
3104 #endif /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */
3106 /* Create a new node. */
3107 #ifdef GC_MALLOC_CHECK
3108 x
= (struct mem_node
*) _malloc_internal (sizeof *x
);
3112 x
= (struct mem_node
*) xmalloc (sizeof *x
);
3118 x
->left
= x
->right
= MEM_NIL
;
3121 /* Insert it as child of PARENT or install it as root. */
3124 if (start
< parent
->start
)
3132 /* Re-establish red-black tree properties. */
3133 mem_insert_fixup (x
);
3139 /* Re-establish the red-black properties of the tree, and thereby
3140 balance the tree, after node X has been inserted; X is always red. */
3143 mem_insert_fixup (x
)
3146 while (x
!= mem_root
&& x
->parent
->color
== MEM_RED
)
3148 /* X is red and its parent is red. This is a violation of
3149 red-black tree property #3. */
3151 if (x
->parent
== x
->parent
->parent
->left
)
3153 /* We're on the left side of our grandparent, and Y is our
3155 struct mem_node
*y
= x
->parent
->parent
->right
;
3157 if (y
->color
== MEM_RED
)
3159 /* Uncle and parent are red but should be black because
3160 X is red. Change the colors accordingly and proceed
3161 with the grandparent. */
3162 x
->parent
->color
= MEM_BLACK
;
3163 y
->color
= MEM_BLACK
;
3164 x
->parent
->parent
->color
= MEM_RED
;
3165 x
= x
->parent
->parent
;
3169 /* Parent and uncle have different colors; parent is
3170 red, uncle is black. */
3171 if (x
== x
->parent
->right
)
3174 mem_rotate_left (x
);
3177 x
->parent
->color
= MEM_BLACK
;
3178 x
->parent
->parent
->color
= MEM_RED
;
3179 mem_rotate_right (x
->parent
->parent
);
3184 /* This is the symmetrical case of above. */
3185 struct mem_node
*y
= x
->parent
->parent
->left
;
3187 if (y
->color
== MEM_RED
)
3189 x
->parent
->color
= MEM_BLACK
;
3190 y
->color
= MEM_BLACK
;
3191 x
->parent
->parent
->color
= MEM_RED
;
3192 x
= x
->parent
->parent
;
3196 if (x
== x
->parent
->left
)
3199 mem_rotate_right (x
);
3202 x
->parent
->color
= MEM_BLACK
;
3203 x
->parent
->parent
->color
= MEM_RED
;
3204 mem_rotate_left (x
->parent
->parent
);
3209 /* The root may have been changed to red due to the algorithm. Set
3210 it to black so that property #5 is satisfied. */
3211 mem_root
->color
= MEM_BLACK
;
3227 /* Turn y's left sub-tree into x's right sub-tree. */
3230 if (y
->left
!= MEM_NIL
)
3231 y
->left
->parent
= x
;
3233 /* Y's parent was x's parent. */
3235 y
->parent
= x
->parent
;
3237 /* Get the parent to point to y instead of x. */
3240 if (x
== x
->parent
->left
)
3241 x
->parent
->left
= y
;
3243 x
->parent
->right
= y
;
3248 /* Put x on y's left. */
3262 mem_rotate_right (x
)
3265 struct mem_node
*y
= x
->left
;
3268 if (y
->right
!= MEM_NIL
)
3269 y
->right
->parent
= x
;
3272 y
->parent
= x
->parent
;
3275 if (x
== x
->parent
->right
)
3276 x
->parent
->right
= y
;
3278 x
->parent
->left
= y
;
3289 /* Delete node Z from the tree. If Z is null or MEM_NIL, do nothing. */
3295 struct mem_node
*x
, *y
;
3297 if (!z
|| z
== MEM_NIL
)
3300 if (z
->left
== MEM_NIL
|| z
->right
== MEM_NIL
)
3305 while (y
->left
!= MEM_NIL
)
3309 if (y
->left
!= MEM_NIL
)
3314 x
->parent
= y
->parent
;
3317 if (y
== y
->parent
->left
)
3318 y
->parent
->left
= x
;
3320 y
->parent
->right
= x
;
3327 z
->start
= y
->start
;
3332 if (y
->color
== MEM_BLACK
)
3333 mem_delete_fixup (x
);
3335 #ifdef GC_MALLOC_CHECK
3343 /* Re-establish the red-black properties of the tree, after a
3347 mem_delete_fixup (x
)
3350 while (x
!= mem_root
&& x
->color
== MEM_BLACK
)
3352 if (x
== x
->parent
->left
)
3354 struct mem_node
*w
= x
->parent
->right
;
3356 if (w
->color
== MEM_RED
)
3358 w
->color
= MEM_BLACK
;
3359 x
->parent
->color
= MEM_RED
;
3360 mem_rotate_left (x
->parent
);
3361 w
= x
->parent
->right
;
3364 if (w
->left
->color
== MEM_BLACK
&& w
->right
->color
== MEM_BLACK
)
3371 if (w
->right
->color
== MEM_BLACK
)
3373 w
->left
->color
= MEM_BLACK
;
3375 mem_rotate_right (w
);
3376 w
= x
->parent
->right
;
3378 w
->color
= x
->parent
->color
;
3379 x
->parent
->color
= MEM_BLACK
;
3380 w
->right
->color
= MEM_BLACK
;
3381 mem_rotate_left (x
->parent
);
3387 struct mem_node
*w
= x
->parent
->left
;
3389 if (w
->color
== MEM_RED
)
3391 w
->color
= MEM_BLACK
;
3392 x
->parent
->color
= MEM_RED
;
3393 mem_rotate_right (x
->parent
);
3394 w
= x
->parent
->left
;
3397 if (w
->right
->color
== MEM_BLACK
&& w
->left
->color
== MEM_BLACK
)
3404 if (w
->left
->color
== MEM_BLACK
)
3406 w
->right
->color
= MEM_BLACK
;
3408 mem_rotate_left (w
);
3409 w
= x
->parent
->left
;
3412 w
->color
= x
->parent
->color
;
3413 x
->parent
->color
= MEM_BLACK
;
3414 w
->left
->color
= MEM_BLACK
;
3415 mem_rotate_right (x
->parent
);
3421 x
->color
= MEM_BLACK
;
3425 /* Value is non-zero if P is a pointer to a live Lisp string on
3426 the heap. M is a pointer to the mem_block for P. */
3429 live_string_p (m
, p
)
3433 if (m
->type
== MEM_TYPE_STRING
)
3435 struct string_block
*b
= (struct string_block
*) m
->start
;
3436 int offset
= (char *) p
- (char *) &b
->strings
[0];
3438 /* P must point to the start of a Lisp_String structure, and it
3439 must not be on the free-list. */
3441 && offset
% sizeof b
->strings
[0] == 0
3442 && offset
< (STRING_BLOCK_SIZE
* sizeof b
->strings
[0])
3443 && ((struct Lisp_String
*) p
)->data
!= NULL
);
3450 /* Value is non-zero if P is a pointer to a live Lisp cons on
3451 the heap. M is a pointer to the mem_block for P. */
3458 if (m
->type
== MEM_TYPE_CONS
)
3460 struct cons_block
*b
= (struct cons_block
*) m
->start
;
3461 int offset
= (char *) p
- (char *) &b
->conses
[0];
3463 /* P must point to the start of a Lisp_Cons, not be
3464 one of the unused cells in the current cons block,
3465 and not be on the free-list. */
3467 && offset
% sizeof b
->conses
[0] == 0
3468 && offset
< (CONS_BLOCK_SIZE
* sizeof b
->conses
[0])
3470 || offset
/ sizeof b
->conses
[0] < cons_block_index
)
3471 && !EQ (((struct Lisp_Cons
*) p
)->car
, Vdead
));
3478 /* Value is non-zero if P is a pointer to a live Lisp symbol on
3479 the heap. M is a pointer to the mem_block for P. */
3482 live_symbol_p (m
, p
)
3486 if (m
->type
== MEM_TYPE_SYMBOL
)
3488 struct symbol_block
*b
= (struct symbol_block
*) m
->start
;
3489 int offset
= (char *) p
- (char *) &b
->symbols
[0];
3491 /* P must point to the start of a Lisp_Symbol, not be
3492 one of the unused cells in the current symbol block,
3493 and not be on the free-list. */
3495 && offset
% sizeof b
->symbols
[0] == 0
3496 && offset
< (SYMBOL_BLOCK_SIZE
* sizeof b
->symbols
[0])
3497 && (b
!= symbol_block
3498 || offset
/ sizeof b
->symbols
[0] < symbol_block_index
)
3499 && !EQ (((struct Lisp_Symbol
*) p
)->function
, Vdead
));
3506 /* Value is non-zero if P is a pointer to a live Lisp float on
3507 the heap. M is a pointer to the mem_block for P. */
3514 if (m
->type
== MEM_TYPE_FLOAT
)
3516 struct float_block
*b
= (struct float_block
*) m
->start
;
3517 int offset
= (char *) p
- (char *) &b
->floats
[0];
3519 /* P must point to the start of a Lisp_Float and not be
3520 one of the unused cells in the current float block. */
3522 && offset
% sizeof b
->floats
[0] == 0
3523 && offset
< (FLOAT_BLOCK_SIZE
* sizeof b
->floats
[0])
3524 && (b
!= float_block
3525 || offset
/ sizeof b
->floats
[0] < float_block_index
));
3532 /* Value is non-zero if P is a pointer to a live Lisp Misc on
3533 the heap. M is a pointer to the mem_block for P. */
3540 if (m
->type
== MEM_TYPE_MISC
)
3542 struct marker_block
*b
= (struct marker_block
*) m
->start
;
3543 int offset
= (char *) p
- (char *) &b
->markers
[0];
3545 /* P must point to the start of a Lisp_Misc, not be
3546 one of the unused cells in the current misc block,
3547 and not be on the free-list. */
3549 && offset
% sizeof b
->markers
[0] == 0
3550 && offset
< (MARKER_BLOCK_SIZE
* sizeof b
->markers
[0])
3551 && (b
!= marker_block
3552 || offset
/ sizeof b
->markers
[0] < marker_block_index
)
3553 && ((union Lisp_Misc
*) p
)->u_marker
.type
!= Lisp_Misc_Free
);
3560 /* Value is non-zero if P is a pointer to a live vector-like object.
3561 M is a pointer to the mem_block for P. */
3564 live_vector_p (m
, p
)
3568 return (p
== m
->start
3569 && m
->type
>= MEM_TYPE_VECTOR
3570 && m
->type
<= MEM_TYPE_WINDOW
);
3574 /* Value is non-zero if P is a pointer to a live buffer. M is a
3575 pointer to the mem_block for P. */
3578 live_buffer_p (m
, p
)
3582 /* P must point to the start of the block, and the buffer
3583 must not have been killed. */
3584 return (m
->type
== MEM_TYPE_BUFFER
3586 && !NILP (((struct buffer
*) p
)->name
));
3589 #endif /* GC_MARK_STACK || defined GC_MALLOC_CHECK */
3593 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
3595 /* Array of objects that are kept alive because the C stack contains
3596 a pattern that looks like a reference to them . */
3598 #define MAX_ZOMBIES 10
3599 static Lisp_Object zombies
[MAX_ZOMBIES
];
3601 /* Number of zombie objects. */
3603 static int nzombies
;
3605 /* Number of garbage collections. */
3609 /* Average percentage of zombies per collection. */
3611 static double avg_zombies
;
3613 /* Max. number of live and zombie objects. */
3615 static int max_live
, max_zombies
;
3617 /* Average number of live objects per GC. */
3619 static double avg_live
;
3621 DEFUN ("gc-status", Fgc_status
, Sgc_status
, 0, 0, "",
3622 doc
: /* Show information about live and zombie objects. */)
3625 Lisp_Object args
[8], zombie_list
= Qnil
;
3627 for (i
= 0; i
< nzombies
; i
++)
3628 zombie_list
= Fcons (zombies
[i
], zombie_list
);
3629 args
[0] = build_string ("%d GCs, avg live/zombies = %.2f/%.2f (%f%%), max %d/%d\nzombies: %S");
3630 args
[1] = make_number (ngcs
);
3631 args
[2] = make_float (avg_live
);
3632 args
[3] = make_float (avg_zombies
);
3633 args
[4] = make_float (avg_zombies
/ avg_live
/ 100);
3634 args
[5] = make_number (max_live
);
3635 args
[6] = make_number (max_zombies
);
3636 args
[7] = zombie_list
;
3637 return Fmessage (8, args
);
3640 #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */
3643 /* Mark OBJ if we can prove it's a Lisp_Object. */
3646 mark_maybe_object (obj
)
3649 void *po
= (void *) XPNTR (obj
);
3650 struct mem_node
*m
= mem_find (po
);
3656 switch (XGCTYPE (obj
))
3659 mark_p
= (live_string_p (m
, po
)
3660 && !STRING_MARKED_P ((struct Lisp_String
*) po
));
3664 mark_p
= (live_cons_p (m
, po
) && !CONS_MARKED_P (XCONS (obj
)));
3668 mark_p
= (live_symbol_p (m
, po
) && !XSYMBOL (obj
)->gcmarkbit
);
3672 mark_p
= (live_float_p (m
, po
) && !FLOAT_MARKED_P (XFLOAT (obj
)));
3675 case Lisp_Vectorlike
:
3676 /* Note: can't check GC_BUFFERP before we know it's a
3677 buffer because checking that dereferences the pointer
3678 PO which might point anywhere. */
3679 if (live_vector_p (m
, po
))
3680 mark_p
= !GC_SUBRP (obj
) && !VECTOR_MARKED_P (XVECTOR (obj
));
3681 else if (live_buffer_p (m
, po
))
3682 mark_p
= GC_BUFFERP (obj
) && !VECTOR_MARKED_P (XBUFFER (obj
));
3686 mark_p
= (live_misc_p (m
, po
) && !XMARKER (obj
)->gcmarkbit
);
3690 case Lisp_Type_Limit
:
3696 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
3697 if (nzombies
< MAX_ZOMBIES
)
3698 zombies
[nzombies
] = obj
;
3707 /* If P points to Lisp data, mark that as live if it isn't already
3711 mark_maybe_pointer (p
)
3716 /* Quickly rule out some values which can't point to Lisp data. We
3717 assume that Lisp data is aligned on even addresses. */
3718 if ((EMACS_INT
) p
& 1)
3724 Lisp_Object obj
= Qnil
;
3728 case MEM_TYPE_NON_LISP
:
3729 /* Nothing to do; not a pointer to Lisp memory. */
3732 case MEM_TYPE_BUFFER
:
3733 if (live_buffer_p (m
, p
) && !VECTOR_MARKED_P((struct buffer
*)p
))
3734 XSETVECTOR (obj
, p
);
3738 if (live_cons_p (m
, p
) && !CONS_MARKED_P ((struct Lisp_Cons
*) p
))
3742 case MEM_TYPE_STRING
:
3743 if (live_string_p (m
, p
)
3744 && !STRING_MARKED_P ((struct Lisp_String
*) p
))
3745 XSETSTRING (obj
, p
);
3749 if (live_misc_p (m
, p
) && !((struct Lisp_Free
*) p
)->gcmarkbit
)
3753 case MEM_TYPE_SYMBOL
:
3754 if (live_symbol_p (m
, p
) && !((struct Lisp_Symbol
*) p
)->gcmarkbit
)
3755 XSETSYMBOL (obj
, p
);
3758 case MEM_TYPE_FLOAT
:
3759 if (live_float_p (m
, p
) && !FLOAT_MARKED_P (p
))
3763 case MEM_TYPE_VECTOR
:
3764 case MEM_TYPE_PROCESS
:
3765 case MEM_TYPE_HASH_TABLE
:
3766 case MEM_TYPE_FRAME
:
3767 case MEM_TYPE_WINDOW
:
3768 if (live_vector_p (m
, p
))
3771 XSETVECTOR (tem
, p
);
3772 if (!GC_SUBRP (tem
) && !VECTOR_MARKED_P (XVECTOR (tem
)))
3787 /* Mark Lisp objects referenced from the address range START..END. */
3790 mark_memory (start
, end
)
3796 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
3800 /* Make START the pointer to the start of the memory region,
3801 if it isn't already. */
3809 /* Mark Lisp_Objects. */
3810 for (p
= (Lisp_Object
*) start
; (void *) p
< end
; ++p
)
3811 mark_maybe_object (*p
);
3813 /* Mark Lisp data pointed to. This is necessary because, in some
3814 situations, the C compiler optimizes Lisp objects away, so that
3815 only a pointer to them remains. Example:
3817 DEFUN ("testme", Ftestme, Stestme, 0, 0, 0, "")
3820 Lisp_Object obj = build_string ("test");
3821 struct Lisp_String *s = XSTRING (obj);
3822 Fgarbage_collect ();
3823 fprintf (stderr, "test `%s'\n", s->data);
3827 Here, `obj' isn't really used, and the compiler optimizes it
3828 away. The only reference to the life string is through the
3831 for (pp
= (void **) start
; (void *) pp
< end
; ++pp
)
3832 mark_maybe_pointer (*pp
);
3835 /* setjmp will work with GCC unless NON_SAVING_SETJMP is defined in
3836 the GCC system configuration. In gcc 3.2, the only systems for
3837 which this is so are i386-sco5 non-ELF, i386-sysv3 (maybe included
3838 by others?) and ns32k-pc532-min. */
3840 #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS
3842 static int setjmp_tested_p
, longjmps_done
;
3844 #define SETJMP_WILL_LIKELY_WORK "\
3846 Emacs garbage collector has been changed to use conservative stack\n\
3847 marking. Emacs has determined that the method it uses to do the\n\
3848 marking will likely work on your system, but this isn't sure.\n\
3850 If you are a system-programmer, or can get the help of a local wizard\n\
3851 who is, please take a look at the function mark_stack in alloc.c, and\n\
3852 verify that the methods used are appropriate for your system.\n\
3854 Please mail the result to <emacs-devel@gnu.org>.\n\
3857 #define SETJMP_WILL_NOT_WORK "\
3859 Emacs garbage collector has been changed to use conservative stack\n\
3860 marking. Emacs has determined that the default method it uses to do the\n\
3861 marking will not work on your system. We will need a system-dependent\n\
3862 solution for your system.\n\
3864 Please take a look at the function mark_stack in alloc.c, and\n\
3865 try to find a way to make it work on your system.\n\
3867 Note that you may get false negatives, depending on the compiler.\n\
3868 In particular, you need to use -O with GCC for this test.\n\
3870 Please mail the result to <emacs-devel@gnu.org>.\n\
3874 /* Perform a quick check if it looks like setjmp saves registers in a
3875 jmp_buf. Print a message to stderr saying so. When this test
3876 succeeds, this is _not_ a proof that setjmp is sufficient for
3877 conservative stack marking. Only the sources or a disassembly
3888 /* Arrange for X to be put in a register. */
3894 if (longjmps_done
== 1)
3896 /* Came here after the longjmp at the end of the function.
3898 If x == 1, the longjmp has restored the register to its
3899 value before the setjmp, and we can hope that setjmp
3900 saves all such registers in the jmp_buf, although that
3903 For other values of X, either something really strange is
3904 taking place, or the setjmp just didn't save the register. */
3907 fprintf (stderr
, SETJMP_WILL_LIKELY_WORK
);
3910 fprintf (stderr
, SETJMP_WILL_NOT_WORK
);
3917 if (longjmps_done
== 1)
3921 #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */
3924 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
3926 /* Abort if anything GCPRO'd doesn't survive the GC. */
3934 for (p
= gcprolist
; p
; p
= p
->next
)
3935 for (i
= 0; i
< p
->nvars
; ++i
)
3936 if (!survives_gc_p (p
->var
[i
]))
3937 /* FIXME: It's not necessarily a bug. It might just be that the
3938 GCPRO is unnecessary or should release the object sooner. */
3942 #elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
3949 fprintf (stderr
, "\nZombies kept alive = %d:\n", nzombies
);
3950 for (i
= 0; i
< min (MAX_ZOMBIES
, nzombies
); ++i
)
3952 fprintf (stderr
, " %d = ", i
);
3953 debug_print (zombies
[i
]);
3957 #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */
3960 /* Mark live Lisp objects on the C stack.
3962 There are several system-dependent problems to consider when
3963 porting this to new architectures:
3967 We have to mark Lisp objects in CPU registers that can hold local
3968 variables or are used to pass parameters.
3970 If GC_SAVE_REGISTERS_ON_STACK is defined, it should expand to
3971 something that either saves relevant registers on the stack, or
3972 calls mark_maybe_object passing it each register's contents.
3974 If GC_SAVE_REGISTERS_ON_STACK is not defined, the current
3975 implementation assumes that calling setjmp saves registers we need
3976 to see in a jmp_buf which itself lies on the stack. This doesn't
3977 have to be true! It must be verified for each system, possibly
3978 by taking a look at the source code of setjmp.
3982 Architectures differ in the way their processor stack is organized.
3983 For example, the stack might look like this
3986 | Lisp_Object | size = 4
3988 | something else | size = 2
3990 | Lisp_Object | size = 4
3994 In such a case, not every Lisp_Object will be aligned equally. To
3995 find all Lisp_Object on the stack it won't be sufficient to walk
3996 the stack in steps of 4 bytes. Instead, two passes will be
3997 necessary, one starting at the start of the stack, and a second
3998 pass starting at the start of the stack + 2. Likewise, if the
3999 minimal alignment of Lisp_Objects on the stack is 1, four passes
4000 would be necessary, each one starting with one byte more offset
4001 from the stack start.
4003 The current code assumes by default that Lisp_Objects are aligned
4004 equally on the stack. */
4011 volatile int stack_grows_down_p
= (char *) &j
> (char *) stack_base
;
4014 /* This trick flushes the register windows so that all the state of
4015 the process is contained in the stack. */
4016 /* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is
4017 needed on ia64 too. See mach_dep.c, where it also says inline
4018 assembler doesn't work with relevant proprietary compilers. */
4023 /* Save registers that we need to see on the stack. We need to see
4024 registers used to hold register variables and registers used to
4026 #ifdef GC_SAVE_REGISTERS_ON_STACK
4027 GC_SAVE_REGISTERS_ON_STACK (end
);
4028 #else /* not GC_SAVE_REGISTERS_ON_STACK */
4030 #ifndef GC_SETJMP_WORKS /* If it hasn't been checked yet that
4031 setjmp will definitely work, test it
4032 and print a message with the result
4034 if (!setjmp_tested_p
)
4036 setjmp_tested_p
= 1;
4039 #endif /* GC_SETJMP_WORKS */
4042 end
= stack_grows_down_p
? (char *) &j
+ sizeof j
: (char *) &j
;
4043 #endif /* not GC_SAVE_REGISTERS_ON_STACK */
4045 /* This assumes that the stack is a contiguous region in memory. If
4046 that's not the case, something has to be done here to iterate
4047 over the stack segments. */
4048 #ifndef GC_LISP_OBJECT_ALIGNMENT
4050 #define GC_LISP_OBJECT_ALIGNMENT __alignof__ (Lisp_Object)
4052 #define GC_LISP_OBJECT_ALIGNMENT sizeof (Lisp_Object)
4055 for (i
= 0; i
< sizeof (Lisp_Object
); i
+= GC_LISP_OBJECT_ALIGNMENT
)
4056 mark_memory ((char *) stack_base
+ i
, end
);
4058 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
4064 #endif /* GC_MARK_STACK != 0 */
4068 /***********************************************************************
4069 Pure Storage Management
4070 ***********************************************************************/
4072 /* Allocate room for SIZE bytes from pure Lisp storage and return a
4073 pointer to it. TYPE is the Lisp type for which the memory is
4074 allocated. TYPE < 0 means it's not used for a Lisp object.
4076 If store_pure_type_info is set and TYPE is >= 0, the type of
4077 the allocated object is recorded in pure_types. */
4079 static POINTER_TYPE
*
4080 pure_alloc (size
, type
)
4084 POINTER_TYPE
*result
;
4086 size_t alignment
= (1 << GCTYPEBITS
);
4088 size_t alignment
= sizeof (EMACS_INT
);
4090 /* Give Lisp_Floats an extra alignment. */
4091 if (type
== Lisp_Float
)
4093 #if defined __GNUC__ && __GNUC__ >= 2
4094 alignment
= __alignof (struct Lisp_Float
);
4096 alignment
= sizeof (struct Lisp_Float
);
4102 result
= ALIGN (purebeg
+ pure_bytes_used
, alignment
);
4103 pure_bytes_used
= ((char *)result
- (char *)purebeg
) + size
;
4105 if (pure_bytes_used
<= pure_size
)
4108 /* Don't allocate a large amount here,
4109 because it might get mmap'd and then its address
4110 might not be usable. */
4111 purebeg
= (char *) xmalloc (10000);
4113 pure_bytes_used_before_overflow
+= pure_bytes_used
- size
;
4114 pure_bytes_used
= 0;
4119 /* Print a warning if PURESIZE is too small. */
4124 if (pure_bytes_used_before_overflow
)
4125 message ("Pure Lisp storage overflow (approx. %d bytes needed)",
4126 (int) (pure_bytes_used
+ pure_bytes_used_before_overflow
));
4130 /* Return a string allocated in pure space. DATA is a buffer holding
4131 NCHARS characters, and NBYTES bytes of string data. MULTIBYTE
4132 non-zero means make the result string multibyte.
4134 Must get an error if pure storage is full, since if it cannot hold
4135 a large string it may be able to hold conses that point to that
4136 string; then the string is not protected from gc. */
4139 make_pure_string (data
, nchars
, nbytes
, multibyte
)
4145 struct Lisp_String
*s
;
4147 s
= (struct Lisp_String
*) pure_alloc (sizeof *s
, Lisp_String
);
4148 s
->data
= (unsigned char *) pure_alloc (nbytes
+ 1, -1);
4150 s
->size_byte
= multibyte
? nbytes
: -1;
4151 bcopy (data
, s
->data
, nbytes
);
4152 s
->data
[nbytes
] = '\0';
4153 s
->intervals
= NULL_INTERVAL
;
4154 XSETSTRING (string
, s
);
4159 /* Return a cons allocated from pure space. Give it pure copies
4160 of CAR as car and CDR as cdr. */
4163 pure_cons (car
, cdr
)
4164 Lisp_Object car
, cdr
;
4166 register Lisp_Object
new;
4167 struct Lisp_Cons
*p
;
4169 p
= (struct Lisp_Cons
*) pure_alloc (sizeof *p
, Lisp_Cons
);
4171 XSETCAR (new, Fpurecopy (car
));
4172 XSETCDR (new, Fpurecopy (cdr
));
4177 /* Value is a float object with value NUM allocated from pure space. */
4180 make_pure_float (num
)
4183 register Lisp_Object
new;
4184 struct Lisp_Float
*p
;
4186 p
= (struct Lisp_Float
*) pure_alloc (sizeof *p
, Lisp_Float
);
4188 XFLOAT_DATA (new) = num
;
4193 /* Return a vector with room for LEN Lisp_Objects allocated from
4197 make_pure_vector (len
)
4201 struct Lisp_Vector
*p
;
4202 size_t size
= sizeof *p
+ (len
- 1) * sizeof (Lisp_Object
);
4204 p
= (struct Lisp_Vector
*) pure_alloc (size
, Lisp_Vectorlike
);
4205 XSETVECTOR (new, p
);
4206 XVECTOR (new)->size
= len
;
4211 DEFUN ("purecopy", Fpurecopy
, Spurecopy
, 1, 1, 0,
4212 doc
: /* Make a copy of OBJECT in pure storage.
4213 Recursively copies contents of vectors and cons cells.
4214 Does not copy symbols. Copies strings without text properties. */)
4216 register Lisp_Object obj
;
4218 if (NILP (Vpurify_flag
))
4221 if (PURE_POINTER_P (XPNTR (obj
)))
4225 return pure_cons (XCAR (obj
), XCDR (obj
));
4226 else if (FLOATP (obj
))
4227 return make_pure_float (XFLOAT_DATA (obj
));
4228 else if (STRINGP (obj
))
4229 return make_pure_string (SDATA (obj
), SCHARS (obj
),
4231 STRING_MULTIBYTE (obj
));
4232 else if (COMPILEDP (obj
) || VECTORP (obj
))
4234 register struct Lisp_Vector
*vec
;
4238 size
= XVECTOR (obj
)->size
;
4239 if (size
& PSEUDOVECTOR_FLAG
)
4240 size
&= PSEUDOVECTOR_SIZE_MASK
;
4241 vec
= XVECTOR (make_pure_vector (size
));
4242 for (i
= 0; i
< size
; i
++)
4243 vec
->contents
[i
] = Fpurecopy (XVECTOR (obj
)->contents
[i
]);
4244 if (COMPILEDP (obj
))
4245 XSETCOMPILED (obj
, vec
);
4247 XSETVECTOR (obj
, vec
);
4250 else if (MARKERP (obj
))
4251 error ("Attempt to copy a marker to pure storage");
4258 /***********************************************************************
4260 ***********************************************************************/
4262 /* Put an entry in staticvec, pointing at the variable with address
4266 staticpro (varaddress
)
4267 Lisp_Object
*varaddress
;
4269 staticvec
[staticidx
++] = varaddress
;
4270 if (staticidx
>= NSTATICS
)
4278 struct catchtag
*next
;
4283 struct backtrace
*next
;
4284 Lisp_Object
*function
;
4285 Lisp_Object
*args
; /* Points to vector of args. */
4286 int nargs
; /* Length of vector. */
4287 /* If nargs is UNEVALLED, args points to slot holding list of
4294 /***********************************************************************
4296 ***********************************************************************/
4298 /* Temporarily prevent garbage collection. */
4301 inhibit_garbage_collection ()
4303 int count
= SPECPDL_INDEX ();
4304 int nbits
= min (VALBITS
, BITS_PER_INT
);
4306 specbind (Qgc_cons_threshold
, make_number (((EMACS_INT
) 1 << (nbits
- 1)) - 1));
4311 DEFUN ("garbage-collect", Fgarbage_collect
, Sgarbage_collect
, 0, 0, "",
4312 doc
: /* Reclaim storage for Lisp objects no longer needed.
4313 Garbage collection happens automatically if you cons more than
4314 `gc-cons-threshold' bytes of Lisp data since previous garbage collection.
4315 `garbage-collect' normally returns a list with info on amount of space in use:
4316 ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)
4317 (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS
4318 (USED-FLOATS . FREE-FLOATS) (USED-INTERVALS . FREE-INTERVALS)
4319 (USED-STRINGS . FREE-STRINGS))
4320 However, if there was overflow in pure space, `garbage-collect'
4321 returns nil, because real GC can't be done. */)
4324 register struct specbinding
*bind
;
4325 struct catchtag
*catch;
4326 struct handler
*handler
;
4327 register struct backtrace
*backlist
;
4328 char stack_top_variable
;
4331 Lisp_Object total
[8];
4332 int count
= SPECPDL_INDEX ();
4333 EMACS_TIME t1
, t2
, t3
;
4338 EMACS_GET_TIME (t1
);
4340 /* Can't GC if pure storage overflowed because we can't determine
4341 if something is a pure object or not. */
4342 if (pure_bytes_used_before_overflow
)
4345 /* In case user calls debug_print during GC,
4346 don't let that cause a recursive GC. */
4347 consing_since_gc
= 0;
4349 /* Save what's currently displayed in the echo area. */
4350 message_p
= push_message ();
4351 record_unwind_protect (pop_message_unwind
, Qnil
);
4353 /* Save a copy of the contents of the stack, for debugging. */
4354 #if MAX_SAVE_STACK > 0
4355 if (NILP (Vpurify_flag
))
4357 i
= &stack_top_variable
- stack_bottom
;
4359 if (i
< MAX_SAVE_STACK
)
4361 if (stack_copy
== 0)
4362 stack_copy
= (char *) xmalloc (stack_copy_size
= i
);
4363 else if (stack_copy_size
< i
)
4364 stack_copy
= (char *) xrealloc (stack_copy
, (stack_copy_size
= i
));
4367 if ((EMACS_INT
) (&stack_top_variable
- stack_bottom
) > 0)
4368 bcopy (stack_bottom
, stack_copy
, i
);
4370 bcopy (&stack_top_variable
, stack_copy
, i
);
4374 #endif /* MAX_SAVE_STACK > 0 */
4376 if (garbage_collection_messages
)
4377 message1_nolog ("Garbage collecting...");
4381 shrink_regexp_cache ();
4383 /* Don't keep undo information around forever. */
4385 register struct buffer
*nextb
= all_buffers
;
4389 /* If a buffer's undo list is Qt, that means that undo is
4390 turned off in that buffer. Calling truncate_undo_list on
4391 Qt tends to return NULL, which effectively turns undo back on.
4392 So don't call truncate_undo_list if undo_list is Qt. */
4393 if (! EQ (nextb
->undo_list
, Qt
))
4395 = truncate_undo_list (nextb
->undo_list
, undo_limit
,
4398 /* Shrink buffer gaps, but skip indirect and dead buffers. */
4399 if (nextb
->base_buffer
== 0 && !NILP (nextb
->name
))
4401 /* If a buffer's gap size is more than 10% of the buffer
4402 size, or larger than 2000 bytes, then shrink it
4403 accordingly. Keep a minimum size of 20 bytes. */
4404 int size
= min (2000, max (20, (nextb
->text
->z_byte
/ 10)));
4406 if (nextb
->text
->gap_size
> size
)
4408 struct buffer
*save_current
= current_buffer
;
4409 current_buffer
= nextb
;
4410 make_gap (-(nextb
->text
->gap_size
- size
));
4411 current_buffer
= save_current
;
4415 nextb
= nextb
->next
;
4421 /* clear_marks (); */
4423 /* Mark all the special slots that serve as the roots of accessibility. */
4425 for (i
= 0; i
< staticidx
; i
++)
4426 mark_object (*staticvec
[i
]);
4428 #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \
4429 || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS)
4433 register struct gcpro
*tail
;
4434 for (tail
= gcprolist
; tail
; tail
= tail
->next
)
4435 for (i
= 0; i
< tail
->nvars
; i
++)
4436 mark_object (tail
->var
[i
]);
4441 for (bind
= specpdl
; bind
!= specpdl_ptr
; bind
++)
4443 mark_object (bind
->symbol
);
4444 mark_object (bind
->old_value
);
4446 for (catch = catchlist
; catch; catch = catch->next
)
4448 mark_object (catch->tag
);
4449 mark_object (catch->val
);
4451 for (handler
= handlerlist
; handler
; handler
= handler
->next
)
4453 mark_object (handler
->handler
);
4454 mark_object (handler
->var
);
4456 for (backlist
= backtrace_list
; backlist
; backlist
= backlist
->next
)
4458 mark_object (*backlist
->function
);
4460 if (backlist
->nargs
== UNEVALLED
|| backlist
->nargs
== MANY
)
4463 i
= backlist
->nargs
- 1;
4465 mark_object (backlist
->args
[i
]);
4470 /* Look thru every buffer's undo list
4471 for elements that update markers that were not marked,
4474 register struct buffer
*nextb
= all_buffers
;
4478 /* If a buffer's undo list is Qt, that means that undo is
4479 turned off in that buffer. Calling truncate_undo_list on
4480 Qt tends to return NULL, which effectively turns undo back on.
4481 So don't call truncate_undo_list if undo_list is Qt. */
4482 if (! EQ (nextb
->undo_list
, Qt
))
4484 Lisp_Object tail
, prev
;
4485 tail
= nextb
->undo_list
;
4487 while (CONSP (tail
))
4489 if (GC_CONSP (XCAR (tail
))
4490 && GC_MARKERP (XCAR (XCAR (tail
)))
4491 && !XMARKER (XCAR (XCAR (tail
)))->gcmarkbit
)
4494 nextb
->undo_list
= tail
= XCDR (tail
);
4498 XSETCDR (prev
, tail
);
4509 nextb
= nextb
->next
;
4513 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4519 extern void xg_mark_data ();
4526 /* Clear the mark bits that we set in certain root slots. */
4528 unmark_byte_stack ();
4529 VECTOR_UNMARK (&buffer_defaults
);
4530 VECTOR_UNMARK (&buffer_local_symbols
);
4532 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES && 0
4538 /* clear_marks (); */
4541 consing_since_gc
= 0;
4542 if (gc_cons_threshold
< 10000)
4543 gc_cons_threshold
= 10000;
4545 if (garbage_collection_messages
)
4547 if (message_p
|| minibuf_level
> 0)
4550 message1_nolog ("Garbage collecting...done");
4553 unbind_to (count
, Qnil
);
4555 total
[0] = Fcons (make_number (total_conses
),
4556 make_number (total_free_conses
));
4557 total
[1] = Fcons (make_number (total_symbols
),
4558 make_number (total_free_symbols
));
4559 total
[2] = Fcons (make_number (total_markers
),
4560 make_number (total_free_markers
));
4561 total
[3] = make_number (total_string_size
);
4562 total
[4] = make_number (total_vector_size
);
4563 total
[5] = Fcons (make_number (total_floats
),
4564 make_number (total_free_floats
));
4565 total
[6] = Fcons (make_number (total_intervals
),
4566 make_number (total_free_intervals
));
4567 total
[7] = Fcons (make_number (total_strings
),
4568 make_number (total_free_strings
));
4570 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4572 /* Compute average percentage of zombies. */
4575 for (i
= 0; i
< 7; ++i
)
4576 if (CONSP (total
[i
]))
4577 nlive
+= XFASTINT (XCAR (total
[i
]));
4579 avg_live
= (avg_live
* ngcs
+ nlive
) / (ngcs
+ 1);
4580 max_live
= max (nlive
, max_live
);
4581 avg_zombies
= (avg_zombies
* ngcs
+ nzombies
) / (ngcs
+ 1);
4582 max_zombies
= max (nzombies
, max_zombies
);
4587 if (!NILP (Vpost_gc_hook
))
4589 int count
= inhibit_garbage_collection ();
4590 safe_run_hooks (Qpost_gc_hook
);
4591 unbind_to (count
, Qnil
);
4594 /* Accumulate statistics. */
4595 EMACS_GET_TIME (t2
);
4596 EMACS_SUB_TIME (t3
, t2
, t1
);
4597 if (FLOATP (Vgc_elapsed
))
4598 Vgc_elapsed
= make_float (XFLOAT_DATA (Vgc_elapsed
) +
4600 EMACS_USECS (t3
) * 1.0e-6);
4603 return Flist (sizeof total
/ sizeof *total
, total
);
4607 /* Mark Lisp objects in glyph matrix MATRIX. Currently the
4608 only interesting objects referenced from glyphs are strings. */
4611 mark_glyph_matrix (matrix
)
4612 struct glyph_matrix
*matrix
;
4614 struct glyph_row
*row
= matrix
->rows
;
4615 struct glyph_row
*end
= row
+ matrix
->nrows
;
4617 for (; row
< end
; ++row
)
4621 for (area
= LEFT_MARGIN_AREA
; area
< LAST_AREA
; ++area
)
4623 struct glyph
*glyph
= row
->glyphs
[area
];
4624 struct glyph
*end_glyph
= glyph
+ row
->used
[area
];
4626 for (; glyph
< end_glyph
; ++glyph
)
4627 if (GC_STRINGP (glyph
->object
)
4628 && !STRING_MARKED_P (XSTRING (glyph
->object
)))
4629 mark_object (glyph
->object
);
4635 /* Mark Lisp faces in the face cache C. */
4639 struct face_cache
*c
;
4644 for (i
= 0; i
< c
->used
; ++i
)
4646 struct face
*face
= FACE_FROM_ID (c
->f
, i
);
4650 for (j
= 0; j
< LFACE_VECTOR_SIZE
; ++j
)
4651 mark_object (face
->lface
[j
]);
4658 #ifdef HAVE_WINDOW_SYSTEM
4660 /* Mark Lisp objects in image IMG. */
4666 mark_object (img
->spec
);
4668 if (!NILP (img
->data
.lisp_val
))
4669 mark_object (img
->data
.lisp_val
);
4673 /* Mark Lisp objects in image cache of frame F. It's done this way so
4674 that we don't have to include xterm.h here. */
4677 mark_image_cache (f
)
4680 forall_images_in_image_cache (f
, mark_image
);
4683 #endif /* HAVE_X_WINDOWS */
4687 /* Mark reference to a Lisp_Object.
4688 If the object referred to has not been seen yet, recursively mark
4689 all the references contained in it. */
4691 #define LAST_MARKED_SIZE 500
4692 Lisp_Object last_marked
[LAST_MARKED_SIZE
];
4693 int last_marked_index
;
4695 /* For debugging--call abort when we cdr down this many
4696 links of a list, in mark_object. In debugging,
4697 the call to abort will hit a breakpoint.
4698 Normally this is zero and the check never goes off. */
4699 int mark_object_loop_halt
;
4705 register Lisp_Object obj
= arg
;
4706 #ifdef GC_CHECK_MARKED_OBJECTS
4714 if (PURE_POINTER_P (XPNTR (obj
)))
4717 last_marked
[last_marked_index
++] = obj
;
4718 if (last_marked_index
== LAST_MARKED_SIZE
)
4719 last_marked_index
= 0;
4721 /* Perform some sanity checks on the objects marked here. Abort if
4722 we encounter an object we know is bogus. This increases GC time
4723 by ~80%, and requires compilation with GC_MARK_STACK != 0. */
4724 #ifdef GC_CHECK_MARKED_OBJECTS
4726 po
= (void *) XPNTR (obj
);
4728 /* Check that the object pointed to by PO is known to be a Lisp
4729 structure allocated from the heap. */
4730 #define CHECK_ALLOCATED() \
4732 m = mem_find (po); \
4737 /* Check that the object pointed to by PO is live, using predicate
4739 #define CHECK_LIVE(LIVEP) \
4741 if (!LIVEP (m, po)) \
4745 /* Check both of the above conditions. */
4746 #define CHECK_ALLOCATED_AND_LIVE(LIVEP) \
4748 CHECK_ALLOCATED (); \
4749 CHECK_LIVE (LIVEP); \
4752 #else /* not GC_CHECK_MARKED_OBJECTS */
4754 #define CHECK_ALLOCATED() (void) 0
4755 #define CHECK_LIVE(LIVEP) (void) 0
4756 #define CHECK_ALLOCATED_AND_LIVE(LIVEP) (void) 0
4758 #endif /* not GC_CHECK_MARKED_OBJECTS */
4760 switch (SWITCH_ENUM_CAST (XGCTYPE (obj
)))
4764 register struct Lisp_String
*ptr
= XSTRING (obj
);
4765 CHECK_ALLOCATED_AND_LIVE (live_string_p
);
4766 MARK_INTERVAL_TREE (ptr
->intervals
);
4768 #ifdef GC_CHECK_STRING_BYTES
4769 /* Check that the string size recorded in the string is the
4770 same as the one recorded in the sdata structure. */
4771 CHECK_STRING_BYTES (ptr
);
4772 #endif /* GC_CHECK_STRING_BYTES */
4776 case Lisp_Vectorlike
:
4777 #ifdef GC_CHECK_MARKED_OBJECTS
4779 if (m
== MEM_NIL
&& !GC_SUBRP (obj
)
4780 && po
!= &buffer_defaults
4781 && po
!= &buffer_local_symbols
)
4783 #endif /* GC_CHECK_MARKED_OBJECTS */
4785 if (GC_BUFFERP (obj
))
4787 if (!VECTOR_MARKED_P (XBUFFER (obj
)))
4789 #ifdef GC_CHECK_MARKED_OBJECTS
4790 if (po
!= &buffer_defaults
&& po
!= &buffer_local_symbols
)
4793 for (b
= all_buffers
; b
&& b
!= po
; b
= b
->next
)
4798 #endif /* GC_CHECK_MARKED_OBJECTS */
4802 else if (GC_SUBRP (obj
))
4804 else if (GC_COMPILEDP (obj
))
4805 /* We could treat this just like a vector, but it is better to
4806 save the COMPILED_CONSTANTS element for last and avoid
4809 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
4810 register EMACS_INT size
= ptr
->size
;
4813 if (VECTOR_MARKED_P (ptr
))
4814 break; /* Already marked */
4816 CHECK_LIVE (live_vector_p
);
4817 VECTOR_MARK (ptr
); /* Else mark it */
4818 size
&= PSEUDOVECTOR_SIZE_MASK
;
4819 for (i
= 0; i
< size
; i
++) /* and then mark its elements */
4821 if (i
!= COMPILED_CONSTANTS
)
4822 mark_object (ptr
->contents
[i
]);
4824 obj
= ptr
->contents
[COMPILED_CONSTANTS
];
4827 else if (GC_FRAMEP (obj
))
4829 register struct frame
*ptr
= XFRAME (obj
);
4831 if (VECTOR_MARKED_P (ptr
)) break; /* Already marked */
4832 VECTOR_MARK (ptr
); /* Else mark it */
4834 CHECK_LIVE (live_vector_p
);
4835 mark_object (ptr
->name
);
4836 mark_object (ptr
->icon_name
);
4837 mark_object (ptr
->title
);
4838 mark_object (ptr
->focus_frame
);
4839 mark_object (ptr
->selected_window
);
4840 mark_object (ptr
->minibuffer_window
);
4841 mark_object (ptr
->param_alist
);
4842 mark_object (ptr
->scroll_bars
);
4843 mark_object (ptr
->condemned_scroll_bars
);
4844 mark_object (ptr
->menu_bar_items
);
4845 mark_object (ptr
->face_alist
);
4846 mark_object (ptr
->menu_bar_vector
);
4847 mark_object (ptr
->buffer_predicate
);
4848 mark_object (ptr
->buffer_list
);
4849 mark_object (ptr
->menu_bar_window
);
4850 mark_object (ptr
->tool_bar_window
);
4851 mark_face_cache (ptr
->face_cache
);
4852 #ifdef HAVE_WINDOW_SYSTEM
4853 mark_image_cache (ptr
);
4854 mark_object (ptr
->tool_bar_items
);
4855 mark_object (ptr
->desired_tool_bar_string
);
4856 mark_object (ptr
->current_tool_bar_string
);
4857 #endif /* HAVE_WINDOW_SYSTEM */
4859 else if (GC_BOOL_VECTOR_P (obj
))
4861 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
4863 if (VECTOR_MARKED_P (ptr
))
4864 break; /* Already marked */
4865 CHECK_LIVE (live_vector_p
);
4866 VECTOR_MARK (ptr
); /* Else mark it */
4868 else if (GC_WINDOWP (obj
))
4870 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
4871 struct window
*w
= XWINDOW (obj
);
4874 /* Stop if already marked. */
4875 if (VECTOR_MARKED_P (ptr
))
4879 CHECK_LIVE (live_vector_p
);
4882 /* There is no Lisp data above The member CURRENT_MATRIX in
4883 struct WINDOW. Stop marking when that slot is reached. */
4885 (char *) &ptr
->contents
[i
] < (char *) &w
->current_matrix
;
4887 mark_object (ptr
->contents
[i
]);
4889 /* Mark glyphs for leaf windows. Marking window matrices is
4890 sufficient because frame matrices use the same glyph
4892 if (NILP (w
->hchild
)
4894 && w
->current_matrix
)
4896 mark_glyph_matrix (w
->current_matrix
);
4897 mark_glyph_matrix (w
->desired_matrix
);
4900 else if (GC_HASH_TABLE_P (obj
))
4902 struct Lisp_Hash_Table
*h
= XHASH_TABLE (obj
);
4904 /* Stop if already marked. */
4905 if (VECTOR_MARKED_P (h
))
4909 CHECK_LIVE (live_vector_p
);
4912 /* Mark contents. */
4913 /* Do not mark next_free or next_weak.
4914 Being in the next_weak chain
4915 should not keep the hash table alive.
4916 No need to mark `count' since it is an integer. */
4917 mark_object (h
->test
);
4918 mark_object (h
->weak
);
4919 mark_object (h
->rehash_size
);
4920 mark_object (h
->rehash_threshold
);
4921 mark_object (h
->hash
);
4922 mark_object (h
->next
);
4923 mark_object (h
->index
);
4924 mark_object (h
->user_hash_function
);
4925 mark_object (h
->user_cmp_function
);
4927 /* If hash table is not weak, mark all keys and values.
4928 For weak tables, mark only the vector. */
4929 if (GC_NILP (h
->weak
))
4930 mark_object (h
->key_and_value
);
4932 VECTOR_MARK (XVECTOR (h
->key_and_value
));
4936 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
4937 register EMACS_INT size
= ptr
->size
;
4940 if (VECTOR_MARKED_P (ptr
)) break; /* Already marked */
4941 CHECK_LIVE (live_vector_p
);
4942 VECTOR_MARK (ptr
); /* Else mark it */
4943 if (size
& PSEUDOVECTOR_FLAG
)
4944 size
&= PSEUDOVECTOR_SIZE_MASK
;
4946 for (i
= 0; i
< size
; i
++) /* and then mark its elements */
4947 mark_object (ptr
->contents
[i
]);
4953 register struct Lisp_Symbol
*ptr
= XSYMBOL (obj
);
4954 struct Lisp_Symbol
*ptrx
;
4956 if (ptr
->gcmarkbit
) break;
4957 CHECK_ALLOCATED_AND_LIVE (live_symbol_p
);
4959 mark_object (ptr
->value
);
4960 mark_object (ptr
->function
);
4961 mark_object (ptr
->plist
);
4963 if (!PURE_POINTER_P (XSTRING (ptr
->xname
)))
4964 MARK_STRING (XSTRING (ptr
->xname
));
4965 MARK_INTERVAL_TREE (STRING_INTERVALS (ptr
->xname
));
4967 /* Note that we do not mark the obarray of the symbol.
4968 It is safe not to do so because nothing accesses that
4969 slot except to check whether it is nil. */
4973 ptrx
= ptr
; /* Use of ptrx avoids compiler bug on Sun */
4974 XSETSYMBOL (obj
, ptrx
);
4981 CHECK_ALLOCATED_AND_LIVE (live_misc_p
);
4982 if (XMARKER (obj
)->gcmarkbit
)
4984 XMARKER (obj
)->gcmarkbit
= 1;
4985 switch (XMISCTYPE (obj
))
4987 case Lisp_Misc_Buffer_Local_Value
:
4988 case Lisp_Misc_Some_Buffer_Local_Value
:
4990 register struct Lisp_Buffer_Local_Value
*ptr
4991 = XBUFFER_LOCAL_VALUE (obj
);
4992 /* If the cdr is nil, avoid recursion for the car. */
4993 if (EQ (ptr
->cdr
, Qnil
))
4995 obj
= ptr
->realvalue
;
4998 mark_object (ptr
->realvalue
);
4999 mark_object (ptr
->buffer
);
5000 mark_object (ptr
->frame
);
5005 case Lisp_Misc_Marker
:
5006 /* DO NOT mark thru the marker's chain.
5007 The buffer's markers chain does not preserve markers from gc;
5008 instead, markers are removed from the chain when freed by gc. */
5009 case Lisp_Misc_Intfwd
:
5010 case Lisp_Misc_Boolfwd
:
5011 case Lisp_Misc_Objfwd
:
5012 case Lisp_Misc_Buffer_Objfwd
:
5013 case Lisp_Misc_Kboard_Objfwd
:
5014 /* Don't bother with Lisp_Buffer_Objfwd,
5015 since all markable slots in current buffer marked anyway. */
5016 /* Don't need to do Lisp_Objfwd, since the places they point
5017 are protected with staticpro. */
5018 case Lisp_Misc_Save_Value
:
5021 case Lisp_Misc_Overlay
:
5023 struct Lisp_Overlay
*ptr
= XOVERLAY (obj
);
5024 mark_object (ptr
->start
);
5025 mark_object (ptr
->end
);
5026 mark_object (ptr
->plist
);
5029 XSETMISC (obj
, ptr
->next
);
5042 register struct Lisp_Cons
*ptr
= XCONS (obj
);
5043 if (CONS_MARKED_P (ptr
)) break;
5044 CHECK_ALLOCATED_AND_LIVE (live_cons_p
);
5046 /* If the cdr is nil, avoid recursion for the car. */
5047 if (EQ (ptr
->cdr
, Qnil
))
5053 mark_object (ptr
->car
);
5056 if (cdr_count
== mark_object_loop_halt
)
5062 CHECK_ALLOCATED_AND_LIVE (live_float_p
);
5063 FLOAT_MARK (XFLOAT (obj
));
5074 #undef CHECK_ALLOCATED
5075 #undef CHECK_ALLOCATED_AND_LIVE
5078 /* Mark the pointers in a buffer structure. */
5084 register struct buffer
*buffer
= XBUFFER (buf
);
5085 register Lisp_Object
*ptr
, tmp
;
5086 Lisp_Object base_buffer
;
5088 VECTOR_MARK (buffer
);
5090 MARK_INTERVAL_TREE (BUF_INTERVALS (buffer
));
5092 if (CONSP (buffer
->undo_list
))
5095 tail
= buffer
->undo_list
;
5097 /* We mark the undo list specially because
5098 its pointers to markers should be weak. */
5100 while (CONSP (tail
))
5102 register struct Lisp_Cons
*ptr
= XCONS (tail
);
5104 if (CONS_MARKED_P (ptr
))
5107 if (GC_CONSP (ptr
->car
)
5108 && !CONS_MARKED_P (XCONS (ptr
->car
))
5109 && GC_MARKERP (XCAR (ptr
->car
)))
5111 CONS_MARK (XCONS (ptr
->car
));
5112 mark_object (XCDR (ptr
->car
));
5115 mark_object (ptr
->car
);
5117 if (CONSP (ptr
->cdr
))
5123 mark_object (XCDR (tail
));
5126 mark_object (buffer
->undo_list
);
5128 if (buffer
->overlays_before
)
5130 XSETMISC (tmp
, buffer
->overlays_before
);
5133 if (buffer
->overlays_after
)
5135 XSETMISC (tmp
, buffer
->overlays_after
);
5139 for (ptr
= &buffer
->name
;
5140 (char *)ptr
< (char *)buffer
+ sizeof (struct buffer
);
5144 /* If this is an indirect buffer, mark its base buffer. */
5145 if (buffer
->base_buffer
&& !VECTOR_MARKED_P (buffer
->base_buffer
))
5147 XSETBUFFER (base_buffer
, buffer
->base_buffer
);
5148 mark_buffer (base_buffer
);
5153 /* Value is non-zero if OBJ will survive the current GC because it's
5154 either marked or does not need to be marked to survive. */
5162 switch (XGCTYPE (obj
))
5169 survives_p
= XSYMBOL (obj
)->gcmarkbit
;
5173 survives_p
= XMARKER (obj
)->gcmarkbit
;
5177 survives_p
= STRING_MARKED_P (XSTRING (obj
));
5180 case Lisp_Vectorlike
:
5181 survives_p
= GC_SUBRP (obj
) || VECTOR_MARKED_P (XVECTOR (obj
));
5185 survives_p
= CONS_MARKED_P (XCONS (obj
));
5189 survives_p
= FLOAT_MARKED_P (XFLOAT (obj
));
5196 return survives_p
|| PURE_POINTER_P ((void *) XPNTR (obj
));
5201 /* Sweep: find all structures not marked, and free them. */
5206 /* Remove or mark entries in weak hash tables.
5207 This must be done before any object is unmarked. */
5208 sweep_weak_hash_tables ();
5211 #ifdef GC_CHECK_STRING_BYTES
5212 if (!noninteractive
)
5213 check_string_bytes (1);
5216 /* Put all unmarked conses on free list */
5218 register struct cons_block
*cblk
;
5219 struct cons_block
**cprev
= &cons_block
;
5220 register int lim
= cons_block_index
;
5221 register int num_free
= 0, num_used
= 0;
5225 for (cblk
= cons_block
; cblk
; cblk
= *cprev
)
5229 for (i
= 0; i
< lim
; i
++)
5230 if (!CONS_MARKED_P (&cblk
->conses
[i
]))
5233 *(struct Lisp_Cons
**)&cblk
->conses
[i
].cdr
= cons_free_list
;
5234 cons_free_list
= &cblk
->conses
[i
];
5236 cons_free_list
->car
= Vdead
;
5242 CONS_UNMARK (&cblk
->conses
[i
]);
5244 lim
= CONS_BLOCK_SIZE
;
5245 /* If this block contains only free conses and we have already
5246 seen more than two blocks worth of free conses then deallocate
5248 if (this_free
== CONS_BLOCK_SIZE
&& num_free
> CONS_BLOCK_SIZE
)
5250 *cprev
= cblk
->next
;
5251 /* Unhook from the free list. */
5252 cons_free_list
= *(struct Lisp_Cons
**) &cblk
->conses
[0].cdr
;
5253 lisp_align_free (cblk
);
5258 num_free
+= this_free
;
5259 cprev
= &cblk
->next
;
5262 total_conses
= num_used
;
5263 total_free_conses
= num_free
;
5266 /* Put all unmarked floats on free list */
5268 register struct float_block
*fblk
;
5269 struct float_block
**fprev
= &float_block
;
5270 register int lim
= float_block_index
;
5271 register int num_free
= 0, num_used
= 0;
5273 float_free_list
= 0;
5275 for (fblk
= float_block
; fblk
; fblk
= *fprev
)
5279 for (i
= 0; i
< lim
; i
++)
5280 if (!FLOAT_MARKED_P (&fblk
->floats
[i
]))
5283 *(struct Lisp_Float
**)&fblk
->floats
[i
].data
= float_free_list
;
5284 float_free_list
= &fblk
->floats
[i
];
5289 FLOAT_UNMARK (&fblk
->floats
[i
]);
5291 lim
= FLOAT_BLOCK_SIZE
;
5292 /* If this block contains only free floats and we have already
5293 seen more than two blocks worth of free floats then deallocate
5295 if (this_free
== FLOAT_BLOCK_SIZE
&& num_free
> FLOAT_BLOCK_SIZE
)
5297 *fprev
= fblk
->next
;
5298 /* Unhook from the free list. */
5299 float_free_list
= *(struct Lisp_Float
**) &fblk
->floats
[0].data
;
5300 lisp_align_free (fblk
);
5305 num_free
+= this_free
;
5306 fprev
= &fblk
->next
;
5309 total_floats
= num_used
;
5310 total_free_floats
= num_free
;
5313 /* Put all unmarked intervals on free list */
5315 register struct interval_block
*iblk
;
5316 struct interval_block
**iprev
= &interval_block
;
5317 register int lim
= interval_block_index
;
5318 register int num_free
= 0, num_used
= 0;
5320 interval_free_list
= 0;
5322 for (iblk
= interval_block
; iblk
; iblk
= *iprev
)
5327 for (i
= 0; i
< lim
; i
++)
5329 if (!iblk
->intervals
[i
].gcmarkbit
)
5331 SET_INTERVAL_PARENT (&iblk
->intervals
[i
], interval_free_list
);
5332 interval_free_list
= &iblk
->intervals
[i
];
5338 iblk
->intervals
[i
].gcmarkbit
= 0;
5341 lim
= INTERVAL_BLOCK_SIZE
;
5342 /* If this block contains only free intervals and we have already
5343 seen more than two blocks worth of free intervals then
5344 deallocate this block. */
5345 if (this_free
== INTERVAL_BLOCK_SIZE
&& num_free
> INTERVAL_BLOCK_SIZE
)
5347 *iprev
= iblk
->next
;
5348 /* Unhook from the free list. */
5349 interval_free_list
= INTERVAL_PARENT (&iblk
->intervals
[0]);
5351 n_interval_blocks
--;
5355 num_free
+= this_free
;
5356 iprev
= &iblk
->next
;
5359 total_intervals
= num_used
;
5360 total_free_intervals
= num_free
;
5363 /* Put all unmarked symbols on free list */
5365 register struct symbol_block
*sblk
;
5366 struct symbol_block
**sprev
= &symbol_block
;
5367 register int lim
= symbol_block_index
;
5368 register int num_free
= 0, num_used
= 0;
5370 symbol_free_list
= NULL
;
5372 for (sblk
= symbol_block
; sblk
; sblk
= *sprev
)
5375 struct Lisp_Symbol
*sym
= sblk
->symbols
;
5376 struct Lisp_Symbol
*end
= sym
+ lim
;
5378 for (; sym
< end
; ++sym
)
5380 /* Check if the symbol was created during loadup. In such a case
5381 it might be pointed to by pure bytecode which we don't trace,
5382 so we conservatively assume that it is live. */
5383 int pure_p
= PURE_POINTER_P (XSTRING (sym
->xname
));
5385 if (!sym
->gcmarkbit
&& !pure_p
)
5387 *(struct Lisp_Symbol
**) &sym
->value
= symbol_free_list
;
5388 symbol_free_list
= sym
;
5390 symbol_free_list
->function
= Vdead
;
5398 UNMARK_STRING (XSTRING (sym
->xname
));
5403 lim
= SYMBOL_BLOCK_SIZE
;
5404 /* If this block contains only free symbols and we have already
5405 seen more than two blocks worth of free symbols then deallocate
5407 if (this_free
== SYMBOL_BLOCK_SIZE
&& num_free
> SYMBOL_BLOCK_SIZE
)
5409 *sprev
= sblk
->next
;
5410 /* Unhook from the free list. */
5411 symbol_free_list
= *(struct Lisp_Symbol
**)&sblk
->symbols
[0].value
;
5417 num_free
+= this_free
;
5418 sprev
= &sblk
->next
;
5421 total_symbols
= num_used
;
5422 total_free_symbols
= num_free
;
5425 /* Put all unmarked misc's on free list.
5426 For a marker, first unchain it from the buffer it points into. */
5428 register struct marker_block
*mblk
;
5429 struct marker_block
**mprev
= &marker_block
;
5430 register int lim
= marker_block_index
;
5431 register int num_free
= 0, num_used
= 0;
5433 marker_free_list
= 0;
5435 for (mblk
= marker_block
; mblk
; mblk
= *mprev
)
5440 for (i
= 0; i
< lim
; i
++)
5442 if (!mblk
->markers
[i
].u_marker
.gcmarkbit
)
5444 if (mblk
->markers
[i
].u_marker
.type
== Lisp_Misc_Marker
)
5445 unchain_marker (&mblk
->markers
[i
].u_marker
);
5446 /* Set the type of the freed object to Lisp_Misc_Free.
5447 We could leave the type alone, since nobody checks it,
5448 but this might catch bugs faster. */
5449 mblk
->markers
[i
].u_marker
.type
= Lisp_Misc_Free
;
5450 mblk
->markers
[i
].u_free
.chain
= marker_free_list
;
5451 marker_free_list
= &mblk
->markers
[i
];
5457 mblk
->markers
[i
].u_marker
.gcmarkbit
= 0;
5460 lim
= MARKER_BLOCK_SIZE
;
5461 /* If this block contains only free markers and we have already
5462 seen more than two blocks worth of free markers then deallocate
5464 if (this_free
== MARKER_BLOCK_SIZE
&& num_free
> MARKER_BLOCK_SIZE
)
5466 *mprev
= mblk
->next
;
5467 /* Unhook from the free list. */
5468 marker_free_list
= mblk
->markers
[0].u_free
.chain
;
5474 num_free
+= this_free
;
5475 mprev
= &mblk
->next
;
5479 total_markers
= num_used
;
5480 total_free_markers
= num_free
;
5483 /* Free all unmarked buffers */
5485 register struct buffer
*buffer
= all_buffers
, *prev
= 0, *next
;
5488 if (!VECTOR_MARKED_P (buffer
))
5491 prev
->next
= buffer
->next
;
5493 all_buffers
= buffer
->next
;
5494 next
= buffer
->next
;
5500 VECTOR_UNMARK (buffer
);
5501 UNMARK_BALANCE_INTERVALS (BUF_INTERVALS (buffer
));
5502 prev
= buffer
, buffer
= buffer
->next
;
5506 /* Free all unmarked vectors */
5508 register struct Lisp_Vector
*vector
= all_vectors
, *prev
= 0, *next
;
5509 total_vector_size
= 0;
5512 if (!VECTOR_MARKED_P (vector
))
5515 prev
->next
= vector
->next
;
5517 all_vectors
= vector
->next
;
5518 next
= vector
->next
;
5526 VECTOR_UNMARK (vector
);
5527 if (vector
->size
& PSEUDOVECTOR_FLAG
)
5528 total_vector_size
+= (PSEUDOVECTOR_SIZE_MASK
& vector
->size
);
5530 total_vector_size
+= vector
->size
;
5531 prev
= vector
, vector
= vector
->next
;
5535 #ifdef GC_CHECK_STRING_BYTES
5536 if (!noninteractive
)
5537 check_string_bytes (1);
5544 /* Debugging aids. */
5546 DEFUN ("memory-limit", Fmemory_limit
, Smemory_limit
, 0, 0, 0,
5547 doc
: /* Return the address of the last byte Emacs has allocated, divided by 1024.
5548 This may be helpful in debugging Emacs's memory usage.
5549 We divide the value by 1024 to make sure it fits in a Lisp integer. */)
5554 XSETINT (end
, (EMACS_INT
) sbrk (0) / 1024);
5559 DEFUN ("memory-use-counts", Fmemory_use_counts
, Smemory_use_counts
, 0, 0, 0,
5560 doc
: /* Return a list of counters that measure how much consing there has been.
5561 Each of these counters increments for a certain kind of object.
5562 The counters wrap around from the largest positive integer to zero.
5563 Garbage collection does not decrease them.
5564 The elements of the value are as follows:
5565 (CONSES FLOATS VECTOR-CELLS SYMBOLS STRING-CHARS MISCS INTERVALS STRINGS)
5566 All are in units of 1 = one object consed
5567 except for VECTOR-CELLS and STRING-CHARS, which count the total length of
5569 MISCS include overlays, markers, and some internal types.
5570 Frames, windows, buffers, and subprocesses count as vectors
5571 (but the contents of a buffer's text do not count here). */)
5574 Lisp_Object consed
[8];
5576 consed
[0] = make_number (min (MOST_POSITIVE_FIXNUM
, cons_cells_consed
));
5577 consed
[1] = make_number (min (MOST_POSITIVE_FIXNUM
, floats_consed
));
5578 consed
[2] = make_number (min (MOST_POSITIVE_FIXNUM
, vector_cells_consed
));
5579 consed
[3] = make_number (min (MOST_POSITIVE_FIXNUM
, symbols_consed
));
5580 consed
[4] = make_number (min (MOST_POSITIVE_FIXNUM
, string_chars_consed
));
5581 consed
[5] = make_number (min (MOST_POSITIVE_FIXNUM
, misc_objects_consed
));
5582 consed
[6] = make_number (min (MOST_POSITIVE_FIXNUM
, intervals_consed
));
5583 consed
[7] = make_number (min (MOST_POSITIVE_FIXNUM
, strings_consed
));
5585 return Flist (8, consed
);
5588 int suppress_checking
;
5590 die (msg
, file
, line
)
5595 fprintf (stderr
, "\r\nEmacs fatal error: %s:%d: %s\r\n",
5600 /* Initialization */
5605 /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */
5607 pure_size
= PURESIZE
;
5608 pure_bytes_used
= 0;
5609 pure_bytes_used_before_overflow
= 0;
5611 /* Initialize the list of free aligned blocks. */
5614 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
5616 Vdead
= make_pure_string ("DEAD", 4, 4, 0);
5620 ignore_warnings
= 1;
5621 #ifdef DOUG_LEA_MALLOC
5622 mallopt (M_TRIM_THRESHOLD
, 128*1024); /* trim threshold */
5623 mallopt (M_MMAP_THRESHOLD
, 64*1024); /* mmap threshold */
5624 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
); /* max. number of mmap'ed areas */
5634 malloc_hysteresis
= 32;
5636 malloc_hysteresis
= 0;
5639 spare_memory
= (char *) malloc (SPARE_MEMORY
);
5641 ignore_warnings
= 0;
5643 byte_stack_list
= 0;
5645 consing_since_gc
= 0;
5646 gc_cons_threshold
= 100000 * sizeof (Lisp_Object
);
5647 #ifdef VIRT_ADDR_VARIES
5648 malloc_sbrk_unused
= 1<<22; /* A large number */
5649 malloc_sbrk_used
= 100000; /* as reasonable as any number */
5650 #endif /* VIRT_ADDR_VARIES */
5657 byte_stack_list
= 0;
5659 #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS
5660 setjmp_tested_p
= longjmps_done
= 0;
5663 Vgc_elapsed
= make_float (0.0);
5670 DEFVAR_INT ("gc-cons-threshold", &gc_cons_threshold
,
5671 doc
: /* *Number of bytes of consing between garbage collections.
5672 Garbage collection can happen automatically once this many bytes have been
5673 allocated since the last garbage collection. All data types count.
5675 Garbage collection happens automatically only when `eval' is called.
5677 By binding this temporarily to a large number, you can effectively
5678 prevent garbage collection during a part of the program. */);
5680 DEFVAR_INT ("pure-bytes-used", &pure_bytes_used
,
5681 doc
: /* Number of bytes of sharable Lisp data allocated so far. */);
5683 DEFVAR_INT ("cons-cells-consed", &cons_cells_consed
,
5684 doc
: /* Number of cons cells that have been consed so far. */);
5686 DEFVAR_INT ("floats-consed", &floats_consed
,
5687 doc
: /* Number of floats that have been consed so far. */);
5689 DEFVAR_INT ("vector-cells-consed", &vector_cells_consed
,
5690 doc
: /* Number of vector cells that have been consed so far. */);
5692 DEFVAR_INT ("symbols-consed", &symbols_consed
,
5693 doc
: /* Number of symbols that have been consed so far. */);
5695 DEFVAR_INT ("string-chars-consed", &string_chars_consed
,
5696 doc
: /* Number of string characters that have been consed so far. */);
5698 DEFVAR_INT ("misc-objects-consed", &misc_objects_consed
,
5699 doc
: /* Number of miscellaneous objects that have been consed so far. */);
5701 DEFVAR_INT ("intervals-consed", &intervals_consed
,
5702 doc
: /* Number of intervals that have been consed so far. */);
5704 DEFVAR_INT ("strings-consed", &strings_consed
,
5705 doc
: /* Number of strings that have been consed so far. */);
5707 DEFVAR_LISP ("purify-flag", &Vpurify_flag
,
5708 doc
: /* Non-nil means loading Lisp code in order to dump an executable.
5709 This means that certain objects should be allocated in shared (pure) space. */);
5711 DEFVAR_INT ("undo-limit", &undo_limit
,
5712 doc
: /* Keep no more undo information once it exceeds this size.
5713 This limit is applied when garbage collection happens.
5714 The size is counted as the number of bytes occupied,
5715 which includes both saved text and other data. */);
5718 DEFVAR_INT ("undo-strong-limit", &undo_strong_limit
,
5719 doc
: /* Don't keep more than this much size of undo information.
5720 A command which pushes past this size is itself forgotten.
5721 This limit is applied when garbage collection happens.
5722 The size is counted as the number of bytes occupied,
5723 which includes both saved text and other data. */);
5724 undo_strong_limit
= 30000;
5726 DEFVAR_BOOL ("garbage-collection-messages", &garbage_collection_messages
,
5727 doc
: /* Non-nil means display messages at start and end of garbage collection. */);
5728 garbage_collection_messages
= 0;
5730 DEFVAR_LISP ("post-gc-hook", &Vpost_gc_hook
,
5731 doc
: /* Hook run after garbage collection has finished. */);
5732 Vpost_gc_hook
= Qnil
;
5733 Qpost_gc_hook
= intern ("post-gc-hook");
5734 staticpro (&Qpost_gc_hook
);
5736 DEFVAR_LISP ("memory-signal-data", &Vmemory_signal_data
,
5737 doc
: /* Precomputed `signal' argument for memory-full error. */);
5738 /* We build this in advance because if we wait until we need it, we might
5739 not be able to allocate the memory to hold it. */
5742 build_string ("Memory exhausted--use M-x save-some-buffers then exit and restart Emacs"));
5744 DEFVAR_LISP ("memory-full", &Vmemory_full
,
5745 doc
: /* Non-nil means we are handling a memory-full error. */);
5746 Vmemory_full
= Qnil
;
5748 staticpro (&Qgc_cons_threshold
);
5749 Qgc_cons_threshold
= intern ("gc-cons-threshold");
5751 staticpro (&Qchar_table_extra_slots
);
5752 Qchar_table_extra_slots
= intern ("char-table-extra-slots");
5754 DEFVAR_LISP ("gc-elapsed", &Vgc_elapsed
,
5755 doc
: /* Accumulated time elapsed in garbage collections.
5756 The time is in seconds as a floating point value. */);
5757 DEFVAR_INT ("gcs-done", &gcs_done
,
5758 doc
: /* Accumulated number of garbage collections done. */);
5763 defsubr (&Smake_byte_code
);
5764 defsubr (&Smake_list
);
5765 defsubr (&Smake_vector
);
5766 defsubr (&Smake_char_table
);
5767 defsubr (&Smake_string
);
5768 defsubr (&Smake_bool_vector
);
5769 defsubr (&Smake_symbol
);
5770 defsubr (&Smake_marker
);
5771 defsubr (&Spurecopy
);
5772 defsubr (&Sgarbage_collect
);
5773 defsubr (&Smemory_limit
);
5774 defsubr (&Smemory_use_counts
);
5776 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
5777 defsubr (&Sgc_status
);
5781 /* arch-tag: 6695ca10-e3c5-4c2c-8bc3-ed26a7dda857
5782 (do not change this comment) */