1 /* Storage allocation and gc for GNU Emacs Lisp interpreter.
2 Copyright (C) 1985-1986, 1988, 1993-1995, 1997-2011
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 3 of the License, or
10 (at your option) any later version.
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. If not, see <http://www.gnu.org/licenses/>. */
22 #include <limits.h> /* For CHAR_BIT. */
27 #ifdef HAVE_GTK_AND_PTHREAD
31 /* This file is part of the core Lisp implementation, and thus must
32 deal with the real data structures. If the Lisp implementation is
33 replaced, this file likely will not be used. */
35 #undef HIDE_LISP_IMPLEMENTATION
38 #include "intervals.h"
44 #include "blockinput.h"
45 #include "character.h"
46 #include "syssignal.h"
47 #include "termhooks.h" /* For struct terminal. */
50 /* GC_MALLOC_CHECK defined means perform validity checks of malloc'd
51 memory. Can do this only if using gmalloc.c. */
53 #if defined SYSTEM_MALLOC || defined DOUG_LEA_MALLOC
54 #undef GC_MALLOC_CHECK
59 extern POINTER_TYPE
*sbrk ();
68 #ifdef DOUG_LEA_MALLOC
71 /* malloc.h #defines this as size_t, at least in glibc2. */
72 #ifndef __malloc_size_t
73 #define __malloc_size_t int
76 /* Specify maximum number of areas to mmap. It would be nice to use a
77 value that explicitly means "no limit". */
79 #define MMAP_MAX_AREAS 100000000
81 #else /* not DOUG_LEA_MALLOC */
83 /* The following come from gmalloc.c. */
85 #define __malloc_size_t size_t
86 extern __malloc_size_t _bytes_used
;
87 extern __malloc_size_t __malloc_extra_blocks
;
89 #endif /* not DOUG_LEA_MALLOC */
91 #if ! defined SYSTEM_MALLOC && ! defined SYNC_INPUT
92 #ifdef HAVE_GTK_AND_PTHREAD
94 /* When GTK uses the file chooser dialog, different backends can be loaded
95 dynamically. One such a backend is the Gnome VFS backend that gets loaded
96 if you run Gnome. That backend creates several threads and also allocates
99 If Emacs sets malloc hooks (! SYSTEM_MALLOC) and the emacs_blocked_*
100 functions below are called from malloc, there is a chance that one
101 of these threads preempts the Emacs main thread and the hook variables
102 end up in an inconsistent state. So we have a mutex to prevent that (note
103 that the backend handles concurrent access to malloc within its own threads
104 but Emacs code running in the main thread is not included in that control).
106 When UNBLOCK_INPUT is called, reinvoke_input_signal may be called. If this
107 happens in one of the backend threads we will have two threads that tries
108 to run Emacs code at once, and the code is not prepared for that.
109 To prevent that, we only call BLOCK/UNBLOCK from the main thread. */
111 static pthread_mutex_t alloc_mutex
;
113 #define BLOCK_INPUT_ALLOC \
116 if (pthread_equal (pthread_self (), main_thread)) \
118 pthread_mutex_lock (&alloc_mutex); \
121 #define UNBLOCK_INPUT_ALLOC \
124 pthread_mutex_unlock (&alloc_mutex); \
125 if (pthread_equal (pthread_self (), main_thread)) \
130 #else /* ! defined HAVE_GTK_AND_PTHREAD */
132 #define BLOCK_INPUT_ALLOC BLOCK_INPUT
133 #define UNBLOCK_INPUT_ALLOC UNBLOCK_INPUT
135 #endif /* ! defined HAVE_GTK_AND_PTHREAD */
136 #endif /* ! defined SYSTEM_MALLOC && ! defined SYNC_INPUT */
138 /* Mark, unmark, query mark bit of a Lisp string. S must be a pointer
139 to a struct Lisp_String. */
141 #define MARK_STRING(S) ((S)->size |= ARRAY_MARK_FLAG)
142 #define UNMARK_STRING(S) ((S)->size &= ~ARRAY_MARK_FLAG)
143 #define STRING_MARKED_P(S) (((S)->size & ARRAY_MARK_FLAG) != 0)
145 #define VECTOR_MARK(V) ((V)->header.size |= ARRAY_MARK_FLAG)
146 #define VECTOR_UNMARK(V) ((V)->header.size &= ~ARRAY_MARK_FLAG)
147 #define VECTOR_MARKED_P(V) (((V)->header.size & ARRAY_MARK_FLAG) != 0)
149 /* Value is the number of bytes of S, a pointer to a struct Lisp_String.
150 Be careful during GC, because S->size contains the mark bit for
153 #define GC_STRING_BYTES(S) (STRING_BYTES (S))
155 /* Global variables. */
156 struct emacs_globals globals
;
158 /* Number of bytes of consing done since the last gc. */
160 EMACS_INT consing_since_gc
;
162 /* Similar minimum, computed from Vgc_cons_percentage. */
164 EMACS_INT gc_relative_threshold
;
166 /* Minimum number of bytes of consing since GC before next GC,
167 when memory is full. */
169 EMACS_INT memory_full_cons_threshold
;
171 /* Nonzero during GC. */
175 /* Nonzero means abort if try to GC.
176 This is for code which is written on the assumption that
177 no GC will happen, so as to verify that assumption. */
181 /* Number of live and free conses etc. */
183 static int total_conses
, total_markers
, total_symbols
, total_vector_size
;
184 static int total_free_conses
, total_free_markers
, total_free_symbols
;
185 static int total_free_floats
, total_floats
;
187 /* Points to memory space allocated as "spare", to be freed if we run
188 out of memory. We keep one large block, four cons-blocks, and
189 two string blocks. */
191 static char *spare_memory
[7];
193 /* Amount of spare memory to keep in large reserve block, or to see
194 whether this much is available when malloc fails on a larger request. */
196 #define SPARE_MEMORY (1 << 14)
198 /* Number of extra blocks malloc should get when it needs more core. */
200 static int malloc_hysteresis
;
202 /* Initialize it to a nonzero value to force it into data space
203 (rather than bss space). That way unexec will remap it into text
204 space (pure), on some systems. We have not implemented the
205 remapping on more recent systems because this is less important
206 nowadays than in the days of small memories and timesharing. */
208 #ifndef VIRT_ADDR_VARIES
211 EMACS_INT pure
[(PURESIZE
+ sizeof (EMACS_INT
) - 1) / sizeof (EMACS_INT
)] = {1,};
212 #define PUREBEG (char *) pure
214 /* Pointer to the pure area, and its size. */
216 static char *purebeg
;
217 static size_t pure_size
;
219 /* Number of bytes of pure storage used before pure storage overflowed.
220 If this is non-zero, this implies that an overflow occurred. */
222 static size_t pure_bytes_used_before_overflow
;
224 /* Value is non-zero if P points into pure space. */
226 #define PURE_POINTER_P(P) \
227 (((PNTR_COMPARISON_TYPE) (P) \
228 < (PNTR_COMPARISON_TYPE) ((char *) purebeg + pure_size)) \
229 && ((PNTR_COMPARISON_TYPE) (P) \
230 >= (PNTR_COMPARISON_TYPE) purebeg))
232 /* Index in pure at which next pure Lisp object will be allocated.. */
234 static EMACS_INT pure_bytes_used_lisp
;
236 /* Number of bytes allocated for non-Lisp objects in pure storage. */
238 static EMACS_INT pure_bytes_used_non_lisp
;
240 /* If nonzero, this is a warning delivered by malloc and not yet
243 const char *pending_malloc_warning
;
245 /* Maximum amount of C stack to save when a GC happens. */
247 #ifndef MAX_SAVE_STACK
248 #define MAX_SAVE_STACK 16000
251 /* Buffer in which we save a copy of the C stack at each GC. */
253 #if MAX_SAVE_STACK > 0
254 static char *stack_copy
;
255 static size_t stack_copy_size
;
258 /* Non-zero means ignore malloc warnings. Set during initialization.
259 Currently not used. */
261 static int ignore_warnings
;
263 static Lisp_Object Qgc_cons_threshold
;
264 Lisp_Object Qchar_table_extra_slots
;
266 /* Hook run after GC has finished. */
268 static Lisp_Object Qpost_gc_hook
;
270 static void mark_buffer (Lisp_Object
);
271 static void mark_terminals (void);
272 static void gc_sweep (void);
273 static void mark_glyph_matrix (struct glyph_matrix
*);
274 static void mark_face_cache (struct face_cache
*);
276 #if !defined REL_ALLOC || defined SYSTEM_MALLOC
277 static void refill_memory_reserve (void);
279 static struct Lisp_String
*allocate_string (void);
280 static void compact_small_strings (void);
281 static void free_large_strings (void);
282 static void sweep_strings (void);
283 static void free_misc (Lisp_Object
);
285 /* When scanning the C stack for live Lisp objects, Emacs keeps track
286 of what memory allocated via lisp_malloc is intended for what
287 purpose. This enumeration specifies the type of memory. */
298 /* We used to keep separate mem_types for subtypes of vectors such as
299 process, hash_table, frame, terminal, and window, but we never made
300 use of the distinction, so it only caused source-code complexity
301 and runtime slowdown. Minor but pointless. */
305 static POINTER_TYPE
*lisp_align_malloc (size_t, enum mem_type
);
306 static POINTER_TYPE
*lisp_malloc (size_t, enum mem_type
);
309 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
311 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
312 #include <stdio.h> /* For fprintf. */
315 /* A unique object in pure space used to make some Lisp objects
316 on free lists recognizable in O(1). */
318 static Lisp_Object Vdead
;
320 #ifdef GC_MALLOC_CHECK
322 enum mem_type allocated_mem_type
;
323 static int dont_register_blocks
;
325 #endif /* GC_MALLOC_CHECK */
327 /* A node in the red-black tree describing allocated memory containing
328 Lisp data. Each such block is recorded with its start and end
329 address when it is allocated, and removed from the tree when it
332 A red-black tree is a balanced binary tree with the following
335 1. Every node is either red or black.
336 2. Every leaf is black.
337 3. If a node is red, then both of its children are black.
338 4. Every simple path from a node to a descendant leaf contains
339 the same number of black nodes.
340 5. The root is always black.
342 When nodes are inserted into the tree, or deleted from the tree,
343 the tree is "fixed" so that these properties are always true.
345 A red-black tree with N internal nodes has height at most 2
346 log(N+1). Searches, insertions and deletions are done in O(log N).
347 Please see a text book about data structures for a detailed
348 description of red-black trees. Any book worth its salt should
353 /* Children of this node. These pointers are never NULL. When there
354 is no child, the value is MEM_NIL, which points to a dummy node. */
355 struct mem_node
*left
, *right
;
357 /* The parent of this node. In the root node, this is NULL. */
358 struct mem_node
*parent
;
360 /* Start and end of allocated region. */
364 enum {MEM_BLACK
, MEM_RED
} color
;
370 /* Base address of stack. Set in main. */
372 Lisp_Object
*stack_base
;
374 /* Root of the tree describing allocated Lisp memory. */
376 static struct mem_node
*mem_root
;
378 /* Lowest and highest known address in the heap. */
380 static void *min_heap_address
, *max_heap_address
;
382 /* Sentinel node of the tree. */
384 static struct mem_node mem_z
;
385 #define MEM_NIL &mem_z
387 static struct Lisp_Vector
*allocate_vectorlike (EMACS_INT
);
388 static void lisp_free (POINTER_TYPE
*);
389 static void mark_stack (void);
390 static int live_vector_p (struct mem_node
*, void *);
391 static int live_buffer_p (struct mem_node
*, void *);
392 static int live_string_p (struct mem_node
*, void *);
393 static int live_cons_p (struct mem_node
*, void *);
394 static int live_symbol_p (struct mem_node
*, void *);
395 static int live_float_p (struct mem_node
*, void *);
396 static int live_misc_p (struct mem_node
*, void *);
397 static void mark_maybe_object (Lisp_Object
);
398 static void mark_memory (void *, void *, int);
399 static void mem_init (void);
400 static struct mem_node
*mem_insert (void *, void *, enum mem_type
);
401 static void mem_insert_fixup (struct mem_node
*);
402 static void mem_rotate_left (struct mem_node
*);
403 static void mem_rotate_right (struct mem_node
*);
404 static void mem_delete (struct mem_node
*);
405 static void mem_delete_fixup (struct mem_node
*);
406 static inline struct mem_node
*mem_find (void *);
409 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
410 static void check_gcpros (void);
413 #endif /* GC_MARK_STACK || GC_MALLOC_CHECK */
415 /* Recording what needs to be marked for gc. */
417 struct gcpro
*gcprolist
;
419 /* Addresses of staticpro'd variables. Initialize it to a nonzero
420 value; otherwise some compilers put it into BSS. */
422 #define NSTATICS 0x640
423 static Lisp_Object
*staticvec
[NSTATICS
] = {&Vpurify_flag
};
425 /* Index of next unused slot in staticvec. */
427 static int staticidx
= 0;
429 static POINTER_TYPE
*pure_alloc (size_t, int);
432 /* Value is SZ rounded up to the next multiple of ALIGNMENT.
433 ALIGNMENT must be a power of 2. */
435 #define ALIGN(ptr, ALIGNMENT) \
436 ((POINTER_TYPE *) ((((uintptr_t) (ptr)) + (ALIGNMENT) - 1) \
437 & ~((ALIGNMENT) - 1)))
441 /************************************************************************
443 ************************************************************************/
445 /* Function malloc calls this if it finds we are near exhausting storage. */
448 malloc_warning (const char *str
)
450 pending_malloc_warning
= str
;
454 /* Display an already-pending malloc warning. */
457 display_malloc_warning (void)
459 call3 (intern ("display-warning"),
461 build_string (pending_malloc_warning
),
462 intern ("emergency"));
463 pending_malloc_warning
= 0;
466 /* Called if we can't allocate relocatable space for a buffer. */
469 buffer_memory_full (EMACS_INT nbytes
)
471 /* If buffers use the relocating allocator, no need to free
472 spare_memory, because we may have plenty of malloc space left
473 that we could get, and if we don't, the malloc that fails will
474 itself cause spare_memory to be freed. If buffers don't use the
475 relocating allocator, treat this like any other failing
479 memory_full (nbytes
);
482 /* This used to call error, but if we've run out of memory, we could
483 get infinite recursion trying to build the string. */
484 xsignal (Qnil
, Vmemory_signal_data
);
488 #ifndef XMALLOC_OVERRUN_CHECK
489 #define XMALLOC_OVERRUN_CHECK_SIZE 0
492 /* Check for overrun in malloc'ed buffers by wrapping a 16 byte header
493 and a 16 byte trailer around each block.
495 The header consists of 12 fixed bytes + a 4 byte integer contaning the
496 original block size, while the trailer consists of 16 fixed bytes.
498 The header is used to detect whether this block has been allocated
499 through these functions -- as it seems that some low-level libc
500 functions may bypass the malloc hooks.
504 #define XMALLOC_OVERRUN_CHECK_SIZE 16
506 static char xmalloc_overrun_check_header
[XMALLOC_OVERRUN_CHECK_SIZE
-4] =
507 { 0x9a, 0x9b, 0xae, 0xaf,
508 0xbf, 0xbe, 0xce, 0xcf,
509 0xea, 0xeb, 0xec, 0xed };
511 static char xmalloc_overrun_check_trailer
[XMALLOC_OVERRUN_CHECK_SIZE
] =
512 { 0xaa, 0xab, 0xac, 0xad,
513 0xba, 0xbb, 0xbc, 0xbd,
514 0xca, 0xcb, 0xcc, 0xcd,
515 0xda, 0xdb, 0xdc, 0xdd };
517 /* Macros to insert and extract the block size in the header. */
519 #define XMALLOC_PUT_SIZE(ptr, size) \
520 (ptr[-1] = (size & 0xff), \
521 ptr[-2] = ((size >> 8) & 0xff), \
522 ptr[-3] = ((size >> 16) & 0xff), \
523 ptr[-4] = ((size >> 24) & 0xff))
525 #define XMALLOC_GET_SIZE(ptr) \
526 (size_t)((unsigned)(ptr[-1]) | \
527 ((unsigned)(ptr[-2]) << 8) | \
528 ((unsigned)(ptr[-3]) << 16) | \
529 ((unsigned)(ptr[-4]) << 24))
532 /* The call depth in overrun_check functions. For example, this might happen:
534 overrun_check_malloc()
535 -> malloc -> (via hook)_-> emacs_blocked_malloc
536 -> overrun_check_malloc
537 call malloc (hooks are NULL, so real malloc is called).
538 malloc returns 10000.
539 add overhead, return 10016.
540 <- (back in overrun_check_malloc)
541 add overhead again, return 10032
542 xmalloc returns 10032.
547 overrun_check_free(10032)
549 free(10016) <- crash, because 10000 is the original pointer. */
551 static int check_depth
;
553 /* Like malloc, but wraps allocated block with header and trailer. */
555 static POINTER_TYPE
*
556 overrun_check_malloc (size_t size
)
558 register unsigned char *val
;
559 size_t overhead
= ++check_depth
== 1 ? XMALLOC_OVERRUN_CHECK_SIZE
*2 : 0;
561 val
= (unsigned char *) malloc (size
+ overhead
);
562 if (val
&& check_depth
== 1)
564 memcpy (val
, xmalloc_overrun_check_header
,
565 XMALLOC_OVERRUN_CHECK_SIZE
- 4);
566 val
+= XMALLOC_OVERRUN_CHECK_SIZE
;
567 XMALLOC_PUT_SIZE(val
, size
);
568 memcpy (val
+ size
, xmalloc_overrun_check_trailer
,
569 XMALLOC_OVERRUN_CHECK_SIZE
);
572 return (POINTER_TYPE
*)val
;
576 /* Like realloc, but checks old block for overrun, and wraps new block
577 with header and trailer. */
579 static POINTER_TYPE
*
580 overrun_check_realloc (POINTER_TYPE
*block
, size_t size
)
582 register unsigned char *val
= (unsigned char *) block
;
583 size_t overhead
= ++check_depth
== 1 ? XMALLOC_OVERRUN_CHECK_SIZE
*2 : 0;
587 && memcmp (xmalloc_overrun_check_header
,
588 val
- XMALLOC_OVERRUN_CHECK_SIZE
,
589 XMALLOC_OVERRUN_CHECK_SIZE
- 4) == 0)
591 size_t osize
= XMALLOC_GET_SIZE (val
);
592 if (memcmp (xmalloc_overrun_check_trailer
, val
+ osize
,
593 XMALLOC_OVERRUN_CHECK_SIZE
))
595 memset (val
+ osize
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
596 val
-= XMALLOC_OVERRUN_CHECK_SIZE
;
597 memset (val
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
600 val
= (unsigned char *) realloc ((POINTER_TYPE
*)val
, size
+ overhead
);
602 if (val
&& check_depth
== 1)
604 memcpy (val
, xmalloc_overrun_check_header
,
605 XMALLOC_OVERRUN_CHECK_SIZE
- 4);
606 val
+= XMALLOC_OVERRUN_CHECK_SIZE
;
607 XMALLOC_PUT_SIZE(val
, size
);
608 memcpy (val
+ size
, xmalloc_overrun_check_trailer
,
609 XMALLOC_OVERRUN_CHECK_SIZE
);
612 return (POINTER_TYPE
*)val
;
615 /* Like free, but checks block for overrun. */
618 overrun_check_free (POINTER_TYPE
*block
)
620 unsigned char *val
= (unsigned char *) block
;
625 && memcmp (xmalloc_overrun_check_header
,
626 val
- XMALLOC_OVERRUN_CHECK_SIZE
,
627 XMALLOC_OVERRUN_CHECK_SIZE
- 4) == 0)
629 size_t osize
= XMALLOC_GET_SIZE (val
);
630 if (memcmp (xmalloc_overrun_check_trailer
, val
+ osize
,
631 XMALLOC_OVERRUN_CHECK_SIZE
))
633 #ifdef XMALLOC_CLEAR_FREE_MEMORY
634 val
-= XMALLOC_OVERRUN_CHECK_SIZE
;
635 memset (val
, 0xff, osize
+ XMALLOC_OVERRUN_CHECK_SIZE
*2);
637 memset (val
+ osize
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
638 val
-= XMALLOC_OVERRUN_CHECK_SIZE
;
639 memset (val
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
650 #define malloc overrun_check_malloc
651 #define realloc overrun_check_realloc
652 #define free overrun_check_free
656 /* When using SYNC_INPUT, we don't call malloc from a signal handler, so
657 there's no need to block input around malloc. */
658 #define MALLOC_BLOCK_INPUT ((void)0)
659 #define MALLOC_UNBLOCK_INPUT ((void)0)
661 #define MALLOC_BLOCK_INPUT BLOCK_INPUT
662 #define MALLOC_UNBLOCK_INPUT UNBLOCK_INPUT
665 /* Like malloc but check for no memory and block interrupt input.. */
668 xmalloc (size_t size
)
670 register POINTER_TYPE
*val
;
673 val
= (POINTER_TYPE
*) malloc (size
);
674 MALLOC_UNBLOCK_INPUT
;
682 /* Like realloc but check for no memory and block interrupt input.. */
685 xrealloc (POINTER_TYPE
*block
, size_t size
)
687 register POINTER_TYPE
*val
;
690 /* We must call malloc explicitly when BLOCK is 0, since some
691 reallocs don't do this. */
693 val
= (POINTER_TYPE
*) malloc (size
);
695 val
= (POINTER_TYPE
*) realloc (block
, size
);
696 MALLOC_UNBLOCK_INPUT
;
704 /* Like free but block interrupt input. */
707 xfree (POINTER_TYPE
*block
)
713 MALLOC_UNBLOCK_INPUT
;
714 /* We don't call refill_memory_reserve here
715 because that duplicates doing so in emacs_blocked_free
716 and the criterion should go there. */
720 /* Like strdup, but uses xmalloc. */
723 xstrdup (const char *s
)
725 size_t len
= strlen (s
) + 1;
726 char *p
= (char *) xmalloc (len
);
732 /* Unwind for SAFE_ALLOCA */
735 safe_alloca_unwind (Lisp_Object arg
)
737 register struct Lisp_Save_Value
*p
= XSAVE_VALUE (arg
);
747 /* Like malloc but used for allocating Lisp data. NBYTES is the
748 number of bytes to allocate, TYPE describes the intended use of the
749 allcated memory block (for strings, for conses, ...). */
752 static void *lisp_malloc_loser
;
755 static POINTER_TYPE
*
756 lisp_malloc (size_t nbytes
, enum mem_type type
)
762 #ifdef GC_MALLOC_CHECK
763 allocated_mem_type
= type
;
766 val
= (void *) malloc (nbytes
);
769 /* If the memory just allocated cannot be addressed thru a Lisp
770 object's pointer, and it needs to be,
771 that's equivalent to running out of memory. */
772 if (val
&& type
!= MEM_TYPE_NON_LISP
)
775 XSETCONS (tem
, (char *) val
+ nbytes
- 1);
776 if ((char *) XCONS (tem
) != (char *) val
+ nbytes
- 1)
778 lisp_malloc_loser
= val
;
785 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
786 if (val
&& type
!= MEM_TYPE_NON_LISP
)
787 mem_insert (val
, (char *) val
+ nbytes
, type
);
790 MALLOC_UNBLOCK_INPUT
;
792 memory_full (nbytes
);
796 /* Free BLOCK. This must be called to free memory allocated with a
797 call to lisp_malloc. */
800 lisp_free (POINTER_TYPE
*block
)
804 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
805 mem_delete (mem_find (block
));
807 MALLOC_UNBLOCK_INPUT
;
810 /* Allocation of aligned blocks of memory to store Lisp data. */
811 /* The entry point is lisp_align_malloc which returns blocks of at most */
812 /* BLOCK_BYTES and guarantees they are aligned on a BLOCK_ALIGN boundary. */
814 /* Use posix_memalloc if the system has it and we're using the system's
815 malloc (because our gmalloc.c routines don't have posix_memalign although
816 its memalloc could be used). */
817 #if defined (HAVE_POSIX_MEMALIGN) && defined (SYSTEM_MALLOC)
818 #define USE_POSIX_MEMALIGN 1
821 /* BLOCK_ALIGN has to be a power of 2. */
822 #define BLOCK_ALIGN (1 << 10)
824 /* Padding to leave at the end of a malloc'd block. This is to give
825 malloc a chance to minimize the amount of memory wasted to alignment.
826 It should be tuned to the particular malloc library used.
827 On glibc-2.3.2, malloc never tries to align, so a padding of 0 is best.
828 posix_memalign on the other hand would ideally prefer a value of 4
829 because otherwise, there's 1020 bytes wasted between each ablocks.
830 In Emacs, testing shows that those 1020 can most of the time be
831 efficiently used by malloc to place other objects, so a value of 0 can
832 still preferable unless you have a lot of aligned blocks and virtually
834 #define BLOCK_PADDING 0
835 #define BLOCK_BYTES \
836 (BLOCK_ALIGN - sizeof (struct ablocks *) - BLOCK_PADDING)
838 /* Internal data structures and constants. */
840 #define ABLOCKS_SIZE 16
842 /* An aligned block of memory. */
847 char payload
[BLOCK_BYTES
];
848 struct ablock
*next_free
;
850 /* `abase' is the aligned base of the ablocks. */
851 /* It is overloaded to hold the virtual `busy' field that counts
852 the number of used ablock in the parent ablocks.
853 The first ablock has the `busy' field, the others have the `abase'
854 field. To tell the difference, we assume that pointers will have
855 integer values larger than 2 * ABLOCKS_SIZE. The lowest bit of `busy'
856 is used to tell whether the real base of the parent ablocks is `abase'
857 (if not, the word before the first ablock holds a pointer to the
859 struct ablocks
*abase
;
860 /* The padding of all but the last ablock is unused. The padding of
861 the last ablock in an ablocks is not allocated. */
863 char padding
[BLOCK_PADDING
];
867 /* A bunch of consecutive aligned blocks. */
870 struct ablock blocks
[ABLOCKS_SIZE
];
873 /* Size of the block requested from malloc or memalign. */
874 #define ABLOCKS_BYTES (sizeof (struct ablocks) - BLOCK_PADDING)
876 #define ABLOCK_ABASE(block) \
877 (((uintptr_t) (block)->abase) <= (1 + 2 * ABLOCKS_SIZE) \
878 ? (struct ablocks *)(block) \
881 /* Virtual `busy' field. */
882 #define ABLOCKS_BUSY(abase) ((abase)->blocks[0].abase)
884 /* Pointer to the (not necessarily aligned) malloc block. */
885 #ifdef USE_POSIX_MEMALIGN
886 #define ABLOCKS_BASE(abase) (abase)
888 #define ABLOCKS_BASE(abase) \
889 (1 & (intptr_t) ABLOCKS_BUSY (abase) ? abase : ((void**)abase)[-1])
892 /* The list of free ablock. */
893 static struct ablock
*free_ablock
;
895 /* Allocate an aligned block of nbytes.
896 Alignment is on a multiple of BLOCK_ALIGN and `nbytes' has to be
897 smaller or equal to BLOCK_BYTES. */
898 static POINTER_TYPE
*
899 lisp_align_malloc (size_t nbytes
, enum mem_type type
)
902 struct ablocks
*abase
;
904 eassert (nbytes
<= BLOCK_BYTES
);
908 #ifdef GC_MALLOC_CHECK
909 allocated_mem_type
= type
;
915 intptr_t aligned
; /* int gets warning casting to 64-bit pointer. */
917 #ifdef DOUG_LEA_MALLOC
918 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
919 because mapped region contents are not preserved in
921 mallopt (M_MMAP_MAX
, 0);
924 #ifdef USE_POSIX_MEMALIGN
926 int err
= posix_memalign (&base
, BLOCK_ALIGN
, ABLOCKS_BYTES
);
932 base
= malloc (ABLOCKS_BYTES
);
933 abase
= ALIGN (base
, BLOCK_ALIGN
);
938 MALLOC_UNBLOCK_INPUT
;
939 memory_full (ABLOCKS_BYTES
);
942 aligned
= (base
== abase
);
944 ((void**)abase
)[-1] = base
;
946 #ifdef DOUG_LEA_MALLOC
947 /* Back to a reasonable maximum of mmap'ed areas. */
948 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
952 /* If the memory just allocated cannot be addressed thru a Lisp
953 object's pointer, and it needs to be, that's equivalent to
954 running out of memory. */
955 if (type
!= MEM_TYPE_NON_LISP
)
958 char *end
= (char *) base
+ ABLOCKS_BYTES
- 1;
960 if ((char *) XCONS (tem
) != end
)
962 lisp_malloc_loser
= base
;
964 MALLOC_UNBLOCK_INPUT
;
965 memory_full (SIZE_MAX
);
970 /* Initialize the blocks and put them on the free list.
971 Is `base' was not properly aligned, we can't use the last block. */
972 for (i
= 0; i
< (aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1); i
++)
974 abase
->blocks
[i
].abase
= abase
;
975 abase
->blocks
[i
].x
.next_free
= free_ablock
;
976 free_ablock
= &abase
->blocks
[i
];
978 ABLOCKS_BUSY (abase
) = (struct ablocks
*) aligned
;
980 eassert (0 == ((uintptr_t) abase
) % BLOCK_ALIGN
);
981 eassert (ABLOCK_ABASE (&abase
->blocks
[3]) == abase
); /* 3 is arbitrary */
982 eassert (ABLOCK_ABASE (&abase
->blocks
[0]) == abase
);
983 eassert (ABLOCKS_BASE (abase
) == base
);
984 eassert (aligned
== (intptr_t) ABLOCKS_BUSY (abase
));
987 abase
= ABLOCK_ABASE (free_ablock
);
988 ABLOCKS_BUSY (abase
) =
989 (struct ablocks
*) (2 + (intptr_t) ABLOCKS_BUSY (abase
));
991 free_ablock
= free_ablock
->x
.next_free
;
993 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
994 if (type
!= MEM_TYPE_NON_LISP
)
995 mem_insert (val
, (char *) val
+ nbytes
, type
);
998 MALLOC_UNBLOCK_INPUT
;
1000 eassert (0 == ((uintptr_t) val
) % BLOCK_ALIGN
);
1005 lisp_align_free (POINTER_TYPE
*block
)
1007 struct ablock
*ablock
= block
;
1008 struct ablocks
*abase
= ABLOCK_ABASE (ablock
);
1011 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
1012 mem_delete (mem_find (block
));
1014 /* Put on free list. */
1015 ablock
->x
.next_free
= free_ablock
;
1016 free_ablock
= ablock
;
1017 /* Update busy count. */
1018 ABLOCKS_BUSY (abase
) =
1019 (struct ablocks
*) (-2 + (intptr_t) ABLOCKS_BUSY (abase
));
1021 if (2 > (intptr_t) ABLOCKS_BUSY (abase
))
1022 { /* All the blocks are free. */
1023 int i
= 0, aligned
= (intptr_t) ABLOCKS_BUSY (abase
);
1024 struct ablock
**tem
= &free_ablock
;
1025 struct ablock
*atop
= &abase
->blocks
[aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1];
1029 if (*tem
>= (struct ablock
*) abase
&& *tem
< atop
)
1032 *tem
= (*tem
)->x
.next_free
;
1035 tem
= &(*tem
)->x
.next_free
;
1037 eassert ((aligned
& 1) == aligned
);
1038 eassert (i
== (aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1));
1039 #ifdef USE_POSIX_MEMALIGN
1040 eassert ((uintptr_t) ABLOCKS_BASE (abase
) % BLOCK_ALIGN
== 0);
1042 free (ABLOCKS_BASE (abase
));
1044 MALLOC_UNBLOCK_INPUT
;
1047 /* Return a new buffer structure allocated from the heap with
1048 a call to lisp_malloc. */
1051 allocate_buffer (void)
1054 = (struct buffer
*) lisp_malloc (sizeof (struct buffer
),
1056 XSETPVECTYPESIZE (b
, PVEC_BUFFER
,
1057 ((sizeof (struct buffer
) + sizeof (EMACS_INT
) - 1)
1058 / sizeof (EMACS_INT
)));
1063 #ifndef SYSTEM_MALLOC
1065 /* Arranging to disable input signals while we're in malloc.
1067 This only works with GNU malloc. To help out systems which can't
1068 use GNU malloc, all the calls to malloc, realloc, and free
1069 elsewhere in the code should be inside a BLOCK_INPUT/UNBLOCK_INPUT
1070 pair; unfortunately, we have no idea what C library functions
1071 might call malloc, so we can't really protect them unless you're
1072 using GNU malloc. Fortunately, most of the major operating systems
1073 can use GNU malloc. */
1076 /* When using SYNC_INPUT, we don't call malloc from a signal handler, so
1077 there's no need to block input around malloc. */
1079 #ifndef DOUG_LEA_MALLOC
1080 extern void * (*__malloc_hook
) (size_t, const void *);
1081 extern void * (*__realloc_hook
) (void *, size_t, const void *);
1082 extern void (*__free_hook
) (void *, const void *);
1083 /* Else declared in malloc.h, perhaps with an extra arg. */
1084 #endif /* DOUG_LEA_MALLOC */
1085 static void * (*old_malloc_hook
) (size_t, const void *);
1086 static void * (*old_realloc_hook
) (void *, size_t, const void*);
1087 static void (*old_free_hook
) (void*, const void*);
1089 #ifdef DOUG_LEA_MALLOC
1090 # define BYTES_USED (mallinfo ().uordblks)
1092 # define BYTES_USED _bytes_used
1095 static __malloc_size_t bytes_used_when_reconsidered
;
1097 /* Value of _bytes_used, when spare_memory was freed. */
1099 static __malloc_size_t bytes_used_when_full
;
1101 /* This function is used as the hook for free to call. */
1104 emacs_blocked_free (void *ptr
, const void *ptr2
)
1108 #ifdef GC_MALLOC_CHECK
1114 if (m
== MEM_NIL
|| m
->start
!= ptr
)
1117 "Freeing `%p' which wasn't allocated with malloc\n", ptr
);
1122 /* fprintf (stderr, "free %p...%p (%p)\n", m->start, m->end, ptr); */
1126 #endif /* GC_MALLOC_CHECK */
1128 __free_hook
= old_free_hook
;
1131 /* If we released our reserve (due to running out of memory),
1132 and we have a fair amount free once again,
1133 try to set aside another reserve in case we run out once more. */
1134 if (! NILP (Vmemory_full
)
1135 /* Verify there is enough space that even with the malloc
1136 hysteresis this call won't run out again.
1137 The code here is correct as long as SPARE_MEMORY
1138 is substantially larger than the block size malloc uses. */
1139 && (bytes_used_when_full
1140 > ((bytes_used_when_reconsidered
= BYTES_USED
)
1141 + max (malloc_hysteresis
, 4) * SPARE_MEMORY
)))
1142 refill_memory_reserve ();
1144 __free_hook
= emacs_blocked_free
;
1145 UNBLOCK_INPUT_ALLOC
;
1149 /* This function is the malloc hook that Emacs uses. */
1152 emacs_blocked_malloc (size_t size
, const void *ptr
)
1157 __malloc_hook
= old_malloc_hook
;
1158 #ifdef DOUG_LEA_MALLOC
1159 /* Segfaults on my system. --lorentey */
1160 /* mallopt (M_TOP_PAD, malloc_hysteresis * 4096); */
1162 __malloc_extra_blocks
= malloc_hysteresis
;
1165 value
= (void *) malloc (size
);
1167 #ifdef GC_MALLOC_CHECK
1169 struct mem_node
*m
= mem_find (value
);
1172 fprintf (stderr
, "Malloc returned %p which is already in use\n",
1174 fprintf (stderr
, "Region in use is %p...%p, %u bytes, type %d\n",
1175 m
->start
, m
->end
, (char *) m
->end
- (char *) m
->start
,
1180 if (!dont_register_blocks
)
1182 mem_insert (value
, (char *) value
+ max (1, size
), allocated_mem_type
);
1183 allocated_mem_type
= MEM_TYPE_NON_LISP
;
1186 #endif /* GC_MALLOC_CHECK */
1188 __malloc_hook
= emacs_blocked_malloc
;
1189 UNBLOCK_INPUT_ALLOC
;
1191 /* fprintf (stderr, "%p malloc\n", value); */
1196 /* This function is the realloc hook that Emacs uses. */
1199 emacs_blocked_realloc (void *ptr
, size_t size
, const void *ptr2
)
1204 __realloc_hook
= old_realloc_hook
;
1206 #ifdef GC_MALLOC_CHECK
1209 struct mem_node
*m
= mem_find (ptr
);
1210 if (m
== MEM_NIL
|| m
->start
!= ptr
)
1213 "Realloc of %p which wasn't allocated with malloc\n",
1221 /* fprintf (stderr, "%p -> realloc\n", ptr); */
1223 /* Prevent malloc from registering blocks. */
1224 dont_register_blocks
= 1;
1225 #endif /* GC_MALLOC_CHECK */
1227 value
= (void *) realloc (ptr
, size
);
1229 #ifdef GC_MALLOC_CHECK
1230 dont_register_blocks
= 0;
1233 struct mem_node
*m
= mem_find (value
);
1236 fprintf (stderr
, "Realloc returns memory that is already in use\n");
1240 /* Can't handle zero size regions in the red-black tree. */
1241 mem_insert (value
, (char *) value
+ max (size
, 1), MEM_TYPE_NON_LISP
);
1244 /* fprintf (stderr, "%p <- realloc\n", value); */
1245 #endif /* GC_MALLOC_CHECK */
1247 __realloc_hook
= emacs_blocked_realloc
;
1248 UNBLOCK_INPUT_ALLOC
;
1254 #ifdef HAVE_GTK_AND_PTHREAD
1255 /* Called from Fdump_emacs so that when the dumped Emacs starts, it has a
1256 normal malloc. Some thread implementations need this as they call
1257 malloc before main. The pthread_self call in BLOCK_INPUT_ALLOC then
1258 calls malloc because it is the first call, and we have an endless loop. */
1261 reset_malloc_hooks ()
1263 __free_hook
= old_free_hook
;
1264 __malloc_hook
= old_malloc_hook
;
1265 __realloc_hook
= old_realloc_hook
;
1267 #endif /* HAVE_GTK_AND_PTHREAD */
1270 /* Called from main to set up malloc to use our hooks. */
1273 uninterrupt_malloc (void)
1275 #ifdef HAVE_GTK_AND_PTHREAD
1276 #ifdef DOUG_LEA_MALLOC
1277 pthread_mutexattr_t attr
;
1279 /* GLIBC has a faster way to do this, but lets keep it portable.
1280 This is according to the Single UNIX Specification. */
1281 pthread_mutexattr_init (&attr
);
1282 pthread_mutexattr_settype (&attr
, PTHREAD_MUTEX_RECURSIVE
);
1283 pthread_mutex_init (&alloc_mutex
, &attr
);
1284 #else /* !DOUG_LEA_MALLOC */
1285 /* Some systems such as Solaris 2.6 don't have a recursive mutex,
1286 and the bundled gmalloc.c doesn't require it. */
1287 pthread_mutex_init (&alloc_mutex
, NULL
);
1288 #endif /* !DOUG_LEA_MALLOC */
1289 #endif /* HAVE_GTK_AND_PTHREAD */
1291 if (__free_hook
!= emacs_blocked_free
)
1292 old_free_hook
= __free_hook
;
1293 __free_hook
= emacs_blocked_free
;
1295 if (__malloc_hook
!= emacs_blocked_malloc
)
1296 old_malloc_hook
= __malloc_hook
;
1297 __malloc_hook
= emacs_blocked_malloc
;
1299 if (__realloc_hook
!= emacs_blocked_realloc
)
1300 old_realloc_hook
= __realloc_hook
;
1301 __realloc_hook
= emacs_blocked_realloc
;
1304 #endif /* not SYNC_INPUT */
1305 #endif /* not SYSTEM_MALLOC */
1309 /***********************************************************************
1311 ***********************************************************************/
1313 /* Number of intervals allocated in an interval_block structure.
1314 The 1020 is 1024 minus malloc overhead. */
1316 #define INTERVAL_BLOCK_SIZE \
1317 ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval))
1319 /* Intervals are allocated in chunks in form of an interval_block
1322 struct interval_block
1324 /* Place `intervals' first, to preserve alignment. */
1325 struct interval intervals
[INTERVAL_BLOCK_SIZE
];
1326 struct interval_block
*next
;
1329 /* Current interval block. Its `next' pointer points to older
1332 static struct interval_block
*interval_block
;
1334 /* Index in interval_block above of the next unused interval
1337 static int interval_block_index
;
1339 /* Number of free and live intervals. */
1341 static int total_free_intervals
, total_intervals
;
1343 /* List of free intervals. */
1345 static INTERVAL interval_free_list
;
1347 /* Total number of interval blocks now in use. */
1349 static int n_interval_blocks
;
1352 /* Initialize interval allocation. */
1355 init_intervals (void)
1357 interval_block
= NULL
;
1358 interval_block_index
= INTERVAL_BLOCK_SIZE
;
1359 interval_free_list
= 0;
1360 n_interval_blocks
= 0;
1364 /* Return a new interval. */
1367 make_interval (void)
1371 /* eassert (!handling_signal); */
1375 if (interval_free_list
)
1377 val
= interval_free_list
;
1378 interval_free_list
= INTERVAL_PARENT (interval_free_list
);
1382 if (interval_block_index
== INTERVAL_BLOCK_SIZE
)
1384 register struct interval_block
*newi
;
1386 newi
= (struct interval_block
*) lisp_malloc (sizeof *newi
,
1389 newi
->next
= interval_block
;
1390 interval_block
= newi
;
1391 interval_block_index
= 0;
1392 n_interval_blocks
++;
1394 val
= &interval_block
->intervals
[interval_block_index
++];
1397 MALLOC_UNBLOCK_INPUT
;
1399 consing_since_gc
+= sizeof (struct interval
);
1401 RESET_INTERVAL (val
);
1407 /* Mark Lisp objects in interval I. */
1410 mark_interval (register INTERVAL i
, Lisp_Object dummy
)
1412 eassert (!i
->gcmarkbit
); /* Intervals are never shared. */
1414 mark_object (i
->plist
);
1418 /* Mark the interval tree rooted in TREE. Don't call this directly;
1419 use the macro MARK_INTERVAL_TREE instead. */
1422 mark_interval_tree (register INTERVAL tree
)
1424 /* No need to test if this tree has been marked already; this
1425 function is always called through the MARK_INTERVAL_TREE macro,
1426 which takes care of that. */
1428 traverse_intervals_noorder (tree
, mark_interval
, Qnil
);
1432 /* Mark the interval tree rooted in I. */
1434 #define MARK_INTERVAL_TREE(i) \
1436 if (!NULL_INTERVAL_P (i) && !i->gcmarkbit) \
1437 mark_interval_tree (i); \
1441 #define UNMARK_BALANCE_INTERVALS(i) \
1443 if (! NULL_INTERVAL_P (i)) \
1444 (i) = balance_intervals (i); \
1448 /* Number support. If USE_LISP_UNION_TYPE is in effect, we
1449 can't create number objects in macros. */
1452 make_number (EMACS_INT n
)
1456 obj
.s
.type
= Lisp_Int
;
1461 /***********************************************************************
1463 ***********************************************************************/
1465 /* Lisp_Strings are allocated in string_block structures. When a new
1466 string_block is allocated, all the Lisp_Strings it contains are
1467 added to a free-list string_free_list. When a new Lisp_String is
1468 needed, it is taken from that list. During the sweep phase of GC,
1469 string_blocks that are entirely free are freed, except two which
1472 String data is allocated from sblock structures. Strings larger
1473 than LARGE_STRING_BYTES, get their own sblock, data for smaller
1474 strings is sub-allocated out of sblocks of size SBLOCK_SIZE.
1476 Sblocks consist internally of sdata structures, one for each
1477 Lisp_String. The sdata structure points to the Lisp_String it
1478 belongs to. The Lisp_String points back to the `u.data' member of
1479 its sdata structure.
1481 When a Lisp_String is freed during GC, it is put back on
1482 string_free_list, and its `data' member and its sdata's `string'
1483 pointer is set to null. The size of the string is recorded in the
1484 `u.nbytes' member of the sdata. So, sdata structures that are no
1485 longer used, can be easily recognized, and it's easy to compact the
1486 sblocks of small strings which we do in compact_small_strings. */
1488 /* Size in bytes of an sblock structure used for small strings. This
1489 is 8192 minus malloc overhead. */
1491 #define SBLOCK_SIZE 8188
1493 /* Strings larger than this are considered large strings. String data
1494 for large strings is allocated from individual sblocks. */
1496 #define LARGE_STRING_BYTES 1024
1498 /* Structure describing string memory sub-allocated from an sblock.
1499 This is where the contents of Lisp strings are stored. */
1503 /* Back-pointer to the string this sdata belongs to. If null, this
1504 structure is free, and the NBYTES member of the union below
1505 contains the string's byte size (the same value that STRING_BYTES
1506 would return if STRING were non-null). If non-null, STRING_BYTES
1507 (STRING) is the size of the data, and DATA contains the string's
1509 struct Lisp_String
*string
;
1511 #ifdef GC_CHECK_STRING_BYTES
1514 unsigned char data
[1];
1516 #define SDATA_NBYTES(S) (S)->nbytes
1517 #define SDATA_DATA(S) (S)->data
1518 #define SDATA_SELECTOR(member) member
1520 #else /* not GC_CHECK_STRING_BYTES */
1524 /* When STRING is non-null. */
1525 unsigned char data
[1];
1527 /* When STRING is null. */
1531 #define SDATA_NBYTES(S) (S)->u.nbytes
1532 #define SDATA_DATA(S) (S)->u.data
1533 #define SDATA_SELECTOR(member) u.member
1535 #endif /* not GC_CHECK_STRING_BYTES */
1537 #define SDATA_DATA_OFFSET offsetof (struct sdata, SDATA_SELECTOR (data))
1541 /* Structure describing a block of memory which is sub-allocated to
1542 obtain string data memory for strings. Blocks for small strings
1543 are of fixed size SBLOCK_SIZE. Blocks for large strings are made
1544 as large as needed. */
1549 struct sblock
*next
;
1551 /* Pointer to the next free sdata block. This points past the end
1552 of the sblock if there isn't any space left in this block. */
1553 struct sdata
*next_free
;
1555 /* Start of data. */
1556 struct sdata first_data
;
1559 /* Number of Lisp strings in a string_block structure. The 1020 is
1560 1024 minus malloc overhead. */
1562 #define STRING_BLOCK_SIZE \
1563 ((1020 - sizeof (struct string_block *)) / sizeof (struct Lisp_String))
1565 /* Structure describing a block from which Lisp_String structures
1570 /* Place `strings' first, to preserve alignment. */
1571 struct Lisp_String strings
[STRING_BLOCK_SIZE
];
1572 struct string_block
*next
;
1575 /* Head and tail of the list of sblock structures holding Lisp string
1576 data. We always allocate from current_sblock. The NEXT pointers
1577 in the sblock structures go from oldest_sblock to current_sblock. */
1579 static struct sblock
*oldest_sblock
, *current_sblock
;
1581 /* List of sblocks for large strings. */
1583 static struct sblock
*large_sblocks
;
1585 /* List of string_block structures, and how many there are. */
1587 static struct string_block
*string_blocks
;
1588 static int n_string_blocks
;
1590 /* Free-list of Lisp_Strings. */
1592 static struct Lisp_String
*string_free_list
;
1594 /* Number of live and free Lisp_Strings. */
1596 static int total_strings
, total_free_strings
;
1598 /* Number of bytes used by live strings. */
1600 static EMACS_INT total_string_size
;
1602 /* Given a pointer to a Lisp_String S which is on the free-list
1603 string_free_list, return a pointer to its successor in the
1606 #define NEXT_FREE_LISP_STRING(S) (*(struct Lisp_String **) (S))
1608 /* Return a pointer to the sdata structure belonging to Lisp string S.
1609 S must be live, i.e. S->data must not be null. S->data is actually
1610 a pointer to the `u.data' member of its sdata structure; the
1611 structure starts at a constant offset in front of that. */
1613 #define SDATA_OF_STRING(S) ((struct sdata *) ((S)->data - SDATA_DATA_OFFSET))
1616 #ifdef GC_CHECK_STRING_OVERRUN
1618 /* We check for overrun in string data blocks by appending a small
1619 "cookie" after each allocated string data block, and check for the
1620 presence of this cookie during GC. */
1622 #define GC_STRING_OVERRUN_COOKIE_SIZE 4
1623 static char const string_overrun_cookie
[GC_STRING_OVERRUN_COOKIE_SIZE
] =
1624 { '\xde', '\xad', '\xbe', '\xef' };
1627 #define GC_STRING_OVERRUN_COOKIE_SIZE 0
1630 /* Value is the size of an sdata structure large enough to hold NBYTES
1631 bytes of string data. The value returned includes a terminating
1632 NUL byte, the size of the sdata structure, and padding. */
1634 #ifdef GC_CHECK_STRING_BYTES
1636 #define SDATA_SIZE(NBYTES) \
1637 ((SDATA_DATA_OFFSET \
1639 + sizeof (EMACS_INT) - 1) \
1640 & ~(sizeof (EMACS_INT) - 1))
1642 #else /* not GC_CHECK_STRING_BYTES */
1644 /* The 'max' reserves space for the nbytes union member even when NBYTES + 1 is
1645 less than the size of that member. The 'max' is not needed when
1646 SDATA_DATA_OFFSET is a multiple of sizeof (EMACS_INT), because then the
1647 alignment code reserves enough space. */
1649 #define SDATA_SIZE(NBYTES) \
1650 ((SDATA_DATA_OFFSET \
1651 + (SDATA_DATA_OFFSET % sizeof (EMACS_INT) == 0 \
1653 : max (NBYTES, sizeof (EMACS_INT) - 1)) \
1655 + sizeof (EMACS_INT) - 1) \
1656 & ~(sizeof (EMACS_INT) - 1))
1658 #endif /* not GC_CHECK_STRING_BYTES */
1660 /* Extra bytes to allocate for each string. */
1662 #define GC_STRING_EXTRA (GC_STRING_OVERRUN_COOKIE_SIZE)
1664 /* Exact bound on the number of bytes in a string, not counting the
1665 terminating null. A string cannot contain more bytes than
1666 STRING_BYTES_BOUND, nor can it be so long that the size_t
1667 arithmetic in allocate_string_data would overflow while it is
1668 calculating a value to be passed to malloc. */
1669 #define STRING_BYTES_MAX \
1670 min (STRING_BYTES_BOUND, \
1671 ((SIZE_MAX - XMALLOC_OVERRUN_CHECK_SIZE - GC_STRING_EXTRA \
1672 - offsetof (struct sblock, first_data) \
1673 - SDATA_DATA_OFFSET) \
1674 & ~(sizeof (EMACS_INT) - 1)))
1676 /* Initialize string allocation. Called from init_alloc_once. */
1681 total_strings
= total_free_strings
= total_string_size
= 0;
1682 oldest_sblock
= current_sblock
= large_sblocks
= NULL
;
1683 string_blocks
= NULL
;
1684 n_string_blocks
= 0;
1685 string_free_list
= NULL
;
1686 empty_unibyte_string
= make_pure_string ("", 0, 0, 0);
1687 empty_multibyte_string
= make_pure_string ("", 0, 0, 1);
1691 #ifdef GC_CHECK_STRING_BYTES
1693 static int check_string_bytes_count
;
1695 #define CHECK_STRING_BYTES(S) STRING_BYTES (S)
1698 /* Like GC_STRING_BYTES, but with debugging check. */
1701 string_bytes (struct Lisp_String
*s
)
1704 (s
->size_byte
< 0 ? s
->size
& ~ARRAY_MARK_FLAG
: s
->size_byte
);
1706 if (!PURE_POINTER_P (s
)
1708 && nbytes
!= SDATA_NBYTES (SDATA_OF_STRING (s
)))
1713 /* Check validity of Lisp strings' string_bytes member in B. */
1716 check_sblock (struct sblock
*b
)
1718 struct sdata
*from
, *end
, *from_end
;
1722 for (from
= &b
->first_data
; from
< end
; from
= from_end
)
1724 /* Compute the next FROM here because copying below may
1725 overwrite data we need to compute it. */
1728 /* Check that the string size recorded in the string is the
1729 same as the one recorded in the sdata structure. */
1731 CHECK_STRING_BYTES (from
->string
);
1734 nbytes
= GC_STRING_BYTES (from
->string
);
1736 nbytes
= SDATA_NBYTES (from
);
1738 nbytes
= SDATA_SIZE (nbytes
);
1739 from_end
= (struct sdata
*) ((char *) from
+ nbytes
+ GC_STRING_EXTRA
);
1744 /* Check validity of Lisp strings' string_bytes member. ALL_P
1745 non-zero means check all strings, otherwise check only most
1746 recently allocated strings. Used for hunting a bug. */
1749 check_string_bytes (int all_p
)
1755 for (b
= large_sblocks
; b
; b
= b
->next
)
1757 struct Lisp_String
*s
= b
->first_data
.string
;
1759 CHECK_STRING_BYTES (s
);
1762 for (b
= oldest_sblock
; b
; b
= b
->next
)
1766 check_sblock (current_sblock
);
1769 #endif /* GC_CHECK_STRING_BYTES */
1771 #ifdef GC_CHECK_STRING_FREE_LIST
1773 /* Walk through the string free list looking for bogus next pointers.
1774 This may catch buffer overrun from a previous string. */
1777 check_string_free_list (void)
1779 struct Lisp_String
*s
;
1781 /* Pop a Lisp_String off the free-list. */
1782 s
= string_free_list
;
1785 if ((uintptr_t) s
< 1024)
1787 s
= NEXT_FREE_LISP_STRING (s
);
1791 #define check_string_free_list()
1794 /* Return a new Lisp_String. */
1796 static struct Lisp_String
*
1797 allocate_string (void)
1799 struct Lisp_String
*s
;
1801 /* eassert (!handling_signal); */
1805 /* If the free-list is empty, allocate a new string_block, and
1806 add all the Lisp_Strings in it to the free-list. */
1807 if (string_free_list
== NULL
)
1809 struct string_block
*b
;
1812 b
= (struct string_block
*) lisp_malloc (sizeof *b
, MEM_TYPE_STRING
);
1813 memset (b
, 0, sizeof *b
);
1814 b
->next
= string_blocks
;
1818 for (i
= STRING_BLOCK_SIZE
- 1; i
>= 0; --i
)
1821 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
1822 string_free_list
= s
;
1825 total_free_strings
+= STRING_BLOCK_SIZE
;
1828 check_string_free_list ();
1830 /* Pop a Lisp_String off the free-list. */
1831 s
= string_free_list
;
1832 string_free_list
= NEXT_FREE_LISP_STRING (s
);
1834 MALLOC_UNBLOCK_INPUT
;
1836 /* Probably not strictly necessary, but play it safe. */
1837 memset (s
, 0, sizeof *s
);
1839 --total_free_strings
;
1842 consing_since_gc
+= sizeof *s
;
1844 #ifdef GC_CHECK_STRING_BYTES
1845 if (!noninteractive
)
1847 if (++check_string_bytes_count
== 200)
1849 check_string_bytes_count
= 0;
1850 check_string_bytes (1);
1853 check_string_bytes (0);
1855 #endif /* GC_CHECK_STRING_BYTES */
1861 /* Set up Lisp_String S for holding NCHARS characters, NBYTES bytes,
1862 plus a NUL byte at the end. Allocate an sdata structure for S, and
1863 set S->data to its `u.data' member. Store a NUL byte at the end of
1864 S->data. Set S->size to NCHARS and S->size_byte to NBYTES. Free
1865 S->data if it was initially non-null. */
1868 allocate_string_data (struct Lisp_String
*s
,
1869 EMACS_INT nchars
, EMACS_INT nbytes
)
1871 struct sdata
*data
, *old_data
;
1873 EMACS_INT needed
, old_nbytes
;
1875 if (STRING_BYTES_MAX
< nbytes
)
1878 /* Determine the number of bytes needed to store NBYTES bytes
1880 needed
= SDATA_SIZE (nbytes
);
1881 old_data
= s
->data
? SDATA_OF_STRING (s
) : NULL
;
1882 old_nbytes
= GC_STRING_BYTES (s
);
1886 if (nbytes
> LARGE_STRING_BYTES
)
1888 size_t size
= offsetof (struct sblock
, first_data
) + needed
;
1890 #ifdef DOUG_LEA_MALLOC
1891 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
1892 because mapped region contents are not preserved in
1895 In case you think of allowing it in a dumped Emacs at the
1896 cost of not being able to re-dump, there's another reason:
1897 mmap'ed data typically have an address towards the top of the
1898 address space, which won't fit into an EMACS_INT (at least on
1899 32-bit systems with the current tagging scheme). --fx */
1900 mallopt (M_MMAP_MAX
, 0);
1903 b
= (struct sblock
*) lisp_malloc (size
+ GC_STRING_EXTRA
, MEM_TYPE_NON_LISP
);
1905 #ifdef DOUG_LEA_MALLOC
1906 /* Back to a reasonable maximum of mmap'ed areas. */
1907 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
1910 b
->next_free
= &b
->first_data
;
1911 b
->first_data
.string
= NULL
;
1912 b
->next
= large_sblocks
;
1915 else if (current_sblock
== NULL
1916 || (((char *) current_sblock
+ SBLOCK_SIZE
1917 - (char *) current_sblock
->next_free
)
1918 < (needed
+ GC_STRING_EXTRA
)))
1920 /* Not enough room in the current sblock. */
1921 b
= (struct sblock
*) lisp_malloc (SBLOCK_SIZE
, MEM_TYPE_NON_LISP
);
1922 b
->next_free
= &b
->first_data
;
1923 b
->first_data
.string
= NULL
;
1927 current_sblock
->next
= b
;
1935 data
= b
->next_free
;
1936 b
->next_free
= (struct sdata
*) ((char *) data
+ needed
+ GC_STRING_EXTRA
);
1938 MALLOC_UNBLOCK_INPUT
;
1941 s
->data
= SDATA_DATA (data
);
1942 #ifdef GC_CHECK_STRING_BYTES
1943 SDATA_NBYTES (data
) = nbytes
;
1946 s
->size_byte
= nbytes
;
1947 s
->data
[nbytes
] = '\0';
1948 #ifdef GC_CHECK_STRING_OVERRUN
1949 memcpy ((char *) data
+ needed
, string_overrun_cookie
,
1950 GC_STRING_OVERRUN_COOKIE_SIZE
);
1953 /* If S had already data assigned, mark that as free by setting its
1954 string back-pointer to null, and recording the size of the data
1958 SDATA_NBYTES (old_data
) = old_nbytes
;
1959 old_data
->string
= NULL
;
1962 consing_since_gc
+= needed
;
1966 /* Sweep and compact strings. */
1969 sweep_strings (void)
1971 struct string_block
*b
, *next
;
1972 struct string_block
*live_blocks
= NULL
;
1974 string_free_list
= NULL
;
1975 total_strings
= total_free_strings
= 0;
1976 total_string_size
= 0;
1978 /* Scan strings_blocks, free Lisp_Strings that aren't marked. */
1979 for (b
= string_blocks
; b
; b
= next
)
1982 struct Lisp_String
*free_list_before
= string_free_list
;
1986 for (i
= 0; i
< STRING_BLOCK_SIZE
; ++i
)
1988 struct Lisp_String
*s
= b
->strings
+ i
;
1992 /* String was not on free-list before. */
1993 if (STRING_MARKED_P (s
))
1995 /* String is live; unmark it and its intervals. */
1998 if (!NULL_INTERVAL_P (s
->intervals
))
1999 UNMARK_BALANCE_INTERVALS (s
->intervals
);
2002 total_string_size
+= STRING_BYTES (s
);
2006 /* String is dead. Put it on the free-list. */
2007 struct sdata
*data
= SDATA_OF_STRING (s
);
2009 /* Save the size of S in its sdata so that we know
2010 how large that is. Reset the sdata's string
2011 back-pointer so that we know it's free. */
2012 #ifdef GC_CHECK_STRING_BYTES
2013 if (GC_STRING_BYTES (s
) != SDATA_NBYTES (data
))
2016 data
->u
.nbytes
= GC_STRING_BYTES (s
);
2018 data
->string
= NULL
;
2020 /* Reset the strings's `data' member so that we
2024 /* Put the string on the free-list. */
2025 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
2026 string_free_list
= s
;
2032 /* S was on the free-list before. Put it there again. */
2033 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
2034 string_free_list
= s
;
2039 /* Free blocks that contain free Lisp_Strings only, except
2040 the first two of them. */
2041 if (nfree
== STRING_BLOCK_SIZE
2042 && total_free_strings
> STRING_BLOCK_SIZE
)
2046 string_free_list
= free_list_before
;
2050 total_free_strings
+= nfree
;
2051 b
->next
= live_blocks
;
2056 check_string_free_list ();
2058 string_blocks
= live_blocks
;
2059 free_large_strings ();
2060 compact_small_strings ();
2062 check_string_free_list ();
2066 /* Free dead large strings. */
2069 free_large_strings (void)
2071 struct sblock
*b
, *next
;
2072 struct sblock
*live_blocks
= NULL
;
2074 for (b
= large_sblocks
; b
; b
= next
)
2078 if (b
->first_data
.string
== NULL
)
2082 b
->next
= live_blocks
;
2087 large_sblocks
= live_blocks
;
2091 /* Compact data of small strings. Free sblocks that don't contain
2092 data of live strings after compaction. */
2095 compact_small_strings (void)
2097 struct sblock
*b
, *tb
, *next
;
2098 struct sdata
*from
, *to
, *end
, *tb_end
;
2099 struct sdata
*to_end
, *from_end
;
2101 /* TB is the sblock we copy to, TO is the sdata within TB we copy
2102 to, and TB_END is the end of TB. */
2104 tb_end
= (struct sdata
*) ((char *) tb
+ SBLOCK_SIZE
);
2105 to
= &tb
->first_data
;
2107 /* Step through the blocks from the oldest to the youngest. We
2108 expect that old blocks will stabilize over time, so that less
2109 copying will happen this way. */
2110 for (b
= oldest_sblock
; b
; b
= b
->next
)
2113 xassert ((char *) end
<= (char *) b
+ SBLOCK_SIZE
);
2115 for (from
= &b
->first_data
; from
< end
; from
= from_end
)
2117 /* Compute the next FROM here because copying below may
2118 overwrite data we need to compute it. */
2121 #ifdef GC_CHECK_STRING_BYTES
2122 /* Check that the string size recorded in the string is the
2123 same as the one recorded in the sdata structure. */
2125 && GC_STRING_BYTES (from
->string
) != SDATA_NBYTES (from
))
2127 #endif /* GC_CHECK_STRING_BYTES */
2130 nbytes
= GC_STRING_BYTES (from
->string
);
2132 nbytes
= SDATA_NBYTES (from
);
2134 if (nbytes
> LARGE_STRING_BYTES
)
2137 nbytes
= SDATA_SIZE (nbytes
);
2138 from_end
= (struct sdata
*) ((char *) from
+ nbytes
+ GC_STRING_EXTRA
);
2140 #ifdef GC_CHECK_STRING_OVERRUN
2141 if (memcmp (string_overrun_cookie
,
2142 (char *) from_end
- GC_STRING_OVERRUN_COOKIE_SIZE
,
2143 GC_STRING_OVERRUN_COOKIE_SIZE
))
2147 /* FROM->string non-null means it's alive. Copy its data. */
2150 /* If TB is full, proceed with the next sblock. */
2151 to_end
= (struct sdata
*) ((char *) to
+ nbytes
+ GC_STRING_EXTRA
);
2152 if (to_end
> tb_end
)
2156 tb_end
= (struct sdata
*) ((char *) tb
+ SBLOCK_SIZE
);
2157 to
= &tb
->first_data
;
2158 to_end
= (struct sdata
*) ((char *) to
+ nbytes
+ GC_STRING_EXTRA
);
2161 /* Copy, and update the string's `data' pointer. */
2164 xassert (tb
!= b
|| to
< from
);
2165 memmove (to
, from
, nbytes
+ GC_STRING_EXTRA
);
2166 to
->string
->data
= SDATA_DATA (to
);
2169 /* Advance past the sdata we copied to. */
2175 /* The rest of the sblocks following TB don't contain live data, so
2176 we can free them. */
2177 for (b
= tb
->next
; b
; b
= next
)
2185 current_sblock
= tb
;
2189 string_overflow (void)
2191 error ("Maximum string size exceeded");
2194 DEFUN ("make-string", Fmake_string
, Smake_string
, 2, 2, 0,
2195 doc
: /* Return a newly created string of length LENGTH, with INIT in each element.
2196 LENGTH must be an integer.
2197 INIT must be an integer that represents a character. */)
2198 (Lisp_Object length
, Lisp_Object init
)
2200 register Lisp_Object val
;
2201 register unsigned char *p
, *end
;
2205 CHECK_NATNUM (length
);
2206 CHECK_CHARACTER (init
);
2208 c
= XFASTINT (init
);
2209 if (ASCII_CHAR_P (c
))
2211 nbytes
= XINT (length
);
2212 val
= make_uninit_string (nbytes
);
2214 end
= p
+ SCHARS (val
);
2220 unsigned char str
[MAX_MULTIBYTE_LENGTH
];
2221 int len
= CHAR_STRING (c
, str
);
2222 EMACS_INT string_len
= XINT (length
);
2224 if (string_len
> STRING_BYTES_MAX
/ len
)
2226 nbytes
= len
* string_len
;
2227 val
= make_uninit_multibyte_string (string_len
, nbytes
);
2232 memcpy (p
, str
, len
);
2242 DEFUN ("make-bool-vector", Fmake_bool_vector
, Smake_bool_vector
, 2, 2, 0,
2243 doc
: /* Return a new bool-vector of length LENGTH, using INIT for each element.
2244 LENGTH must be a number. INIT matters only in whether it is t or nil. */)
2245 (Lisp_Object length
, Lisp_Object init
)
2247 register Lisp_Object val
;
2248 struct Lisp_Bool_Vector
*p
;
2249 EMACS_INT length_in_chars
, length_in_elts
;
2252 CHECK_NATNUM (length
);
2254 bits_per_value
= sizeof (EMACS_INT
) * BOOL_VECTOR_BITS_PER_CHAR
;
2256 length_in_elts
= (XFASTINT (length
) + bits_per_value
- 1) / bits_per_value
;
2257 length_in_chars
= ((XFASTINT (length
) + BOOL_VECTOR_BITS_PER_CHAR
- 1)
2258 / BOOL_VECTOR_BITS_PER_CHAR
);
2260 /* We must allocate one more elements than LENGTH_IN_ELTS for the
2261 slot `size' of the struct Lisp_Bool_Vector. */
2262 val
= Fmake_vector (make_number (length_in_elts
+ 1), Qnil
);
2264 /* No Lisp_Object to trace in there. */
2265 XSETPVECTYPESIZE (XVECTOR (val
), PVEC_BOOL_VECTOR
, 0);
2267 p
= XBOOL_VECTOR (val
);
2268 p
->size
= XFASTINT (length
);
2270 memset (p
->data
, NILP (init
) ? 0 : -1, length_in_chars
);
2272 /* Clear the extraneous bits in the last byte. */
2273 if (XINT (length
) != length_in_chars
* BOOL_VECTOR_BITS_PER_CHAR
)
2274 p
->data
[length_in_chars
- 1]
2275 &= (1 << (XINT (length
) % BOOL_VECTOR_BITS_PER_CHAR
)) - 1;
2281 /* Make a string from NBYTES bytes at CONTENTS, and compute the number
2282 of characters from the contents. This string may be unibyte or
2283 multibyte, depending on the contents. */
2286 make_string (const char *contents
, EMACS_INT nbytes
)
2288 register Lisp_Object val
;
2289 EMACS_INT nchars
, multibyte_nbytes
;
2291 parse_str_as_multibyte ((const unsigned char *) contents
, nbytes
,
2292 &nchars
, &multibyte_nbytes
);
2293 if (nbytes
== nchars
|| nbytes
!= multibyte_nbytes
)
2294 /* CONTENTS contains no multibyte sequences or contains an invalid
2295 multibyte sequence. We must make unibyte string. */
2296 val
= make_unibyte_string (contents
, nbytes
);
2298 val
= make_multibyte_string (contents
, nchars
, nbytes
);
2303 /* Make an unibyte string from LENGTH bytes at CONTENTS. */
2306 make_unibyte_string (const char *contents
, EMACS_INT length
)
2308 register Lisp_Object val
;
2309 val
= make_uninit_string (length
);
2310 memcpy (SDATA (val
), contents
, length
);
2315 /* Make a multibyte string from NCHARS characters occupying NBYTES
2316 bytes at CONTENTS. */
2319 make_multibyte_string (const char *contents
,
2320 EMACS_INT nchars
, EMACS_INT nbytes
)
2322 register Lisp_Object val
;
2323 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2324 memcpy (SDATA (val
), contents
, nbytes
);
2329 /* Make a string from NCHARS characters occupying NBYTES bytes at
2330 CONTENTS. It is a multibyte string if NBYTES != NCHARS. */
2333 make_string_from_bytes (const char *contents
,
2334 EMACS_INT nchars
, EMACS_INT nbytes
)
2336 register Lisp_Object val
;
2337 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2338 memcpy (SDATA (val
), contents
, nbytes
);
2339 if (SBYTES (val
) == SCHARS (val
))
2340 STRING_SET_UNIBYTE (val
);
2345 /* Make a string from NCHARS characters occupying NBYTES bytes at
2346 CONTENTS. The argument MULTIBYTE controls whether to label the
2347 string as multibyte. If NCHARS is negative, it counts the number of
2348 characters by itself. */
2351 make_specified_string (const char *contents
,
2352 EMACS_INT nchars
, EMACS_INT nbytes
, int multibyte
)
2354 register Lisp_Object val
;
2359 nchars
= multibyte_chars_in_text ((const unsigned char *) contents
,
2364 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2365 memcpy (SDATA (val
), contents
, nbytes
);
2367 STRING_SET_UNIBYTE (val
);
2372 /* Make a string from the data at STR, treating it as multibyte if the
2376 build_string (const char *str
)
2378 return make_string (str
, strlen (str
));
2382 /* Return an unibyte Lisp_String set up to hold LENGTH characters
2383 occupying LENGTH bytes. */
2386 make_uninit_string (EMACS_INT length
)
2391 return empty_unibyte_string
;
2392 val
= make_uninit_multibyte_string (length
, length
);
2393 STRING_SET_UNIBYTE (val
);
2398 /* Return a multibyte Lisp_String set up to hold NCHARS characters
2399 which occupy NBYTES bytes. */
2402 make_uninit_multibyte_string (EMACS_INT nchars
, EMACS_INT nbytes
)
2405 struct Lisp_String
*s
;
2410 return empty_multibyte_string
;
2412 s
= allocate_string ();
2413 allocate_string_data (s
, nchars
, nbytes
);
2414 XSETSTRING (string
, s
);
2415 string_chars_consed
+= nbytes
;
2421 /***********************************************************************
2423 ***********************************************************************/
2425 /* We store float cells inside of float_blocks, allocating a new
2426 float_block with malloc whenever necessary. Float cells reclaimed
2427 by GC are put on a free list to be reallocated before allocating
2428 any new float cells from the latest float_block. */
2430 #define FLOAT_BLOCK_SIZE \
2431 (((BLOCK_BYTES - sizeof (struct float_block *) \
2432 /* The compiler might add padding at the end. */ \
2433 - (sizeof (struct Lisp_Float) - sizeof (int))) * CHAR_BIT) \
2434 / (sizeof (struct Lisp_Float) * CHAR_BIT + 1))
2436 #define GETMARKBIT(block,n) \
2437 (((block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2438 >> ((n) % (sizeof(int) * CHAR_BIT))) \
2441 #define SETMARKBIT(block,n) \
2442 (block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2443 |= 1 << ((n) % (sizeof(int) * CHAR_BIT))
2445 #define UNSETMARKBIT(block,n) \
2446 (block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2447 &= ~(1 << ((n) % (sizeof(int) * CHAR_BIT)))
2449 #define FLOAT_BLOCK(fptr) \
2450 ((struct float_block *) (((uintptr_t) (fptr)) & ~(BLOCK_ALIGN - 1)))
2452 #define FLOAT_INDEX(fptr) \
2453 ((((uintptr_t) (fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Float))
2457 /* Place `floats' at the beginning, to ease up FLOAT_INDEX's job. */
2458 struct Lisp_Float floats
[FLOAT_BLOCK_SIZE
];
2459 int gcmarkbits
[1 + FLOAT_BLOCK_SIZE
/ (sizeof(int) * CHAR_BIT
)];
2460 struct float_block
*next
;
2463 #define FLOAT_MARKED_P(fptr) \
2464 GETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2466 #define FLOAT_MARK(fptr) \
2467 SETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2469 #define FLOAT_UNMARK(fptr) \
2470 UNSETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2472 /* Current float_block. */
2474 static struct float_block
*float_block
;
2476 /* Index of first unused Lisp_Float in the current float_block. */
2478 static int float_block_index
;
2480 /* Total number of float blocks now in use. */
2482 static int n_float_blocks
;
2484 /* Free-list of Lisp_Floats. */
2486 static struct Lisp_Float
*float_free_list
;
2489 /* Initialize float allocation. */
2495 float_block_index
= FLOAT_BLOCK_SIZE
; /* Force alloc of new float_block. */
2496 float_free_list
= 0;
2501 /* Return a new float object with value FLOAT_VALUE. */
2504 make_float (double float_value
)
2506 register Lisp_Object val
;
2508 /* eassert (!handling_signal); */
2512 if (float_free_list
)
2514 /* We use the data field for chaining the free list
2515 so that we won't use the same field that has the mark bit. */
2516 XSETFLOAT (val
, float_free_list
);
2517 float_free_list
= float_free_list
->u
.chain
;
2521 if (float_block_index
== FLOAT_BLOCK_SIZE
)
2523 register struct float_block
*new;
2525 new = (struct float_block
*) lisp_align_malloc (sizeof *new,
2527 new->next
= float_block
;
2528 memset (new->gcmarkbits
, 0, sizeof new->gcmarkbits
);
2530 float_block_index
= 0;
2533 XSETFLOAT (val
, &float_block
->floats
[float_block_index
]);
2534 float_block_index
++;
2537 MALLOC_UNBLOCK_INPUT
;
2539 XFLOAT_INIT (val
, float_value
);
2540 eassert (!FLOAT_MARKED_P (XFLOAT (val
)));
2541 consing_since_gc
+= sizeof (struct Lisp_Float
);
2548 /***********************************************************************
2550 ***********************************************************************/
2552 /* We store cons cells inside of cons_blocks, allocating a new
2553 cons_block with malloc whenever necessary. Cons cells reclaimed by
2554 GC are put on a free list to be reallocated before allocating
2555 any new cons cells from the latest cons_block. */
2557 #define CONS_BLOCK_SIZE \
2558 (((BLOCK_BYTES - sizeof (struct cons_block *)) * CHAR_BIT) \
2559 / (sizeof (struct Lisp_Cons) * CHAR_BIT + 1))
2561 #define CONS_BLOCK(fptr) \
2562 ((struct cons_block *) ((uintptr_t) (fptr) & ~(BLOCK_ALIGN - 1)))
2564 #define CONS_INDEX(fptr) \
2565 (((uintptr_t) (fptr) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Cons))
2569 /* Place `conses' at the beginning, to ease up CONS_INDEX's job. */
2570 struct Lisp_Cons conses
[CONS_BLOCK_SIZE
];
2571 int gcmarkbits
[1 + CONS_BLOCK_SIZE
/ (sizeof(int) * CHAR_BIT
)];
2572 struct cons_block
*next
;
2575 #define CONS_MARKED_P(fptr) \
2576 GETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2578 #define CONS_MARK(fptr) \
2579 SETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2581 #define CONS_UNMARK(fptr) \
2582 UNSETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2584 /* Current cons_block. */
2586 static struct cons_block
*cons_block
;
2588 /* Index of first unused Lisp_Cons in the current block. */
2590 static int cons_block_index
;
2592 /* Free-list of Lisp_Cons structures. */
2594 static struct Lisp_Cons
*cons_free_list
;
2596 /* Total number of cons blocks now in use. */
2598 static int n_cons_blocks
;
2601 /* Initialize cons allocation. */
2607 cons_block_index
= CONS_BLOCK_SIZE
; /* Force alloc of new cons_block. */
2613 /* Explicitly free a cons cell by putting it on the free-list. */
2616 free_cons (struct Lisp_Cons
*ptr
)
2618 ptr
->u
.chain
= cons_free_list
;
2622 cons_free_list
= ptr
;
2625 DEFUN ("cons", Fcons
, Scons
, 2, 2, 0,
2626 doc
: /* Create a new cons, give it CAR and CDR as components, and return it. */)
2627 (Lisp_Object car
, Lisp_Object cdr
)
2629 register Lisp_Object val
;
2631 /* eassert (!handling_signal); */
2637 /* We use the cdr for chaining the free list
2638 so that we won't use the same field that has the mark bit. */
2639 XSETCONS (val
, cons_free_list
);
2640 cons_free_list
= cons_free_list
->u
.chain
;
2644 if (cons_block_index
== CONS_BLOCK_SIZE
)
2646 register struct cons_block
*new;
2647 new = (struct cons_block
*) lisp_align_malloc (sizeof *new,
2649 memset (new->gcmarkbits
, 0, sizeof new->gcmarkbits
);
2650 new->next
= cons_block
;
2652 cons_block_index
= 0;
2655 XSETCONS (val
, &cons_block
->conses
[cons_block_index
]);
2659 MALLOC_UNBLOCK_INPUT
;
2663 eassert (!CONS_MARKED_P (XCONS (val
)));
2664 consing_since_gc
+= sizeof (struct Lisp_Cons
);
2665 cons_cells_consed
++;
2669 #ifdef GC_CHECK_CONS_LIST
2670 /* Get an error now if there's any junk in the cons free list. */
2672 check_cons_list (void)
2674 struct Lisp_Cons
*tail
= cons_free_list
;
2677 tail
= tail
->u
.chain
;
2681 /* Make a list of 1, 2, 3, 4 or 5 specified objects. */
2684 list1 (Lisp_Object arg1
)
2686 return Fcons (arg1
, Qnil
);
2690 list2 (Lisp_Object arg1
, Lisp_Object arg2
)
2692 return Fcons (arg1
, Fcons (arg2
, Qnil
));
2697 list3 (Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
2699 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Qnil
)));
2704 list4 (Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
, Lisp_Object arg4
)
2706 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Fcons (arg4
, Qnil
))));
2711 list5 (Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
, Lisp_Object arg4
, Lisp_Object arg5
)
2713 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Fcons (arg4
,
2714 Fcons (arg5
, Qnil
)))));
2718 DEFUN ("list", Flist
, Slist
, 0, MANY
, 0,
2719 doc
: /* Return a newly created list with specified arguments as elements.
2720 Any number of arguments, even zero arguments, are allowed.
2721 usage: (list &rest OBJECTS) */)
2722 (size_t nargs
, register Lisp_Object
*args
)
2724 register Lisp_Object val
;
2730 val
= Fcons (args
[nargs
], val
);
2736 DEFUN ("make-list", Fmake_list
, Smake_list
, 2, 2, 0,
2737 doc
: /* Return a newly created list of length LENGTH, with each element being INIT. */)
2738 (register Lisp_Object length
, Lisp_Object init
)
2740 register Lisp_Object val
;
2741 register EMACS_INT size
;
2743 CHECK_NATNUM (length
);
2744 size
= XFASTINT (length
);
2749 val
= Fcons (init
, val
);
2754 val
= Fcons (init
, val
);
2759 val
= Fcons (init
, val
);
2764 val
= Fcons (init
, val
);
2769 val
= Fcons (init
, val
);
2784 /***********************************************************************
2786 ***********************************************************************/
2788 /* Singly-linked list of all vectors. */
2790 static struct Lisp_Vector
*all_vectors
;
2792 /* Total number of vector-like objects now in use. */
2794 static int n_vectors
;
2797 /* Value is a pointer to a newly allocated Lisp_Vector structure
2798 with room for LEN Lisp_Objects. */
2800 static struct Lisp_Vector
*
2801 allocate_vectorlike (EMACS_INT len
)
2803 struct Lisp_Vector
*p
;
2805 int header_size
= offsetof (struct Lisp_Vector
, contents
);
2806 int word_size
= sizeof p
->contents
[0];
2808 if ((SIZE_MAX
- header_size
) / word_size
< len
)
2809 memory_full (SIZE_MAX
);
2813 #ifdef DOUG_LEA_MALLOC
2814 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
2815 because mapped region contents are not preserved in
2817 mallopt (M_MMAP_MAX
, 0);
2820 /* This gets triggered by code which I haven't bothered to fix. --Stef */
2821 /* eassert (!handling_signal); */
2823 nbytes
= header_size
+ len
* word_size
;
2824 p
= (struct Lisp_Vector
*) lisp_malloc (nbytes
, MEM_TYPE_VECTORLIKE
);
2826 #ifdef DOUG_LEA_MALLOC
2827 /* Back to a reasonable maximum of mmap'ed areas. */
2828 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
2831 consing_since_gc
+= nbytes
;
2832 vector_cells_consed
+= len
;
2834 p
->header
.next
.vector
= all_vectors
;
2837 MALLOC_UNBLOCK_INPUT
;
2844 /* Allocate a vector with NSLOTS slots. */
2846 struct Lisp_Vector
*
2847 allocate_vector (EMACS_INT nslots
)
2849 struct Lisp_Vector
*v
= allocate_vectorlike (nslots
);
2850 v
->header
.size
= nslots
;
2855 /* Allocate other vector-like structures. */
2857 struct Lisp_Vector
*
2858 allocate_pseudovector (int memlen
, int lisplen
, EMACS_INT tag
)
2860 struct Lisp_Vector
*v
= allocate_vectorlike (memlen
);
2863 /* Only the first lisplen slots will be traced normally by the GC. */
2864 for (i
= 0; i
< lisplen
; ++i
)
2865 v
->contents
[i
] = Qnil
;
2867 XSETPVECTYPESIZE (v
, tag
, lisplen
);
2871 struct Lisp_Hash_Table
*
2872 allocate_hash_table (void)
2874 return ALLOCATE_PSEUDOVECTOR (struct Lisp_Hash_Table
, count
, PVEC_HASH_TABLE
);
2879 allocate_window (void)
2881 return ALLOCATE_PSEUDOVECTOR(struct window
, current_matrix
, PVEC_WINDOW
);
2886 allocate_terminal (void)
2888 struct terminal
*t
= ALLOCATE_PSEUDOVECTOR (struct terminal
,
2889 next_terminal
, PVEC_TERMINAL
);
2890 /* Zero out the non-GC'd fields. FIXME: This should be made unnecessary. */
2891 memset (&t
->next_terminal
, 0,
2892 (char*) (t
+ 1) - (char*) &t
->next_terminal
);
2898 allocate_frame (void)
2900 struct frame
*f
= ALLOCATE_PSEUDOVECTOR (struct frame
,
2901 face_cache
, PVEC_FRAME
);
2902 /* Zero out the non-GC'd fields. FIXME: This should be made unnecessary. */
2903 memset (&f
->face_cache
, 0,
2904 (char *) (f
+ 1) - (char *) &f
->face_cache
);
2909 struct Lisp_Process
*
2910 allocate_process (void)
2912 return ALLOCATE_PSEUDOVECTOR (struct Lisp_Process
, pid
, PVEC_PROCESS
);
2916 DEFUN ("make-vector", Fmake_vector
, Smake_vector
, 2, 2, 0,
2917 doc
: /* Return a newly created vector of length LENGTH, with each element being INIT.
2918 See also the function `vector'. */)
2919 (register Lisp_Object length
, Lisp_Object init
)
2922 register EMACS_INT sizei
;
2923 register EMACS_INT i
;
2924 register struct Lisp_Vector
*p
;
2926 CHECK_NATNUM (length
);
2927 sizei
= XFASTINT (length
);
2929 p
= allocate_vector (sizei
);
2930 for (i
= 0; i
< sizei
; i
++)
2931 p
->contents
[i
] = init
;
2933 XSETVECTOR (vector
, p
);
2938 DEFUN ("vector", Fvector
, Svector
, 0, MANY
, 0,
2939 doc
: /* Return a newly created vector with specified arguments as elements.
2940 Any number of arguments, even zero arguments, are allowed.
2941 usage: (vector &rest OBJECTS) */)
2942 (register size_t nargs
, Lisp_Object
*args
)
2944 register Lisp_Object len
, val
;
2946 register struct Lisp_Vector
*p
;
2948 XSETFASTINT (len
, nargs
);
2949 val
= Fmake_vector (len
, Qnil
);
2951 for (i
= 0; i
< nargs
; i
++)
2952 p
->contents
[i
] = args
[i
];
2957 DEFUN ("make-byte-code", Fmake_byte_code
, Smake_byte_code
, 4, MANY
, 0,
2958 doc
: /* Create a byte-code object with specified arguments as elements.
2959 The arguments should be the ARGLIST, bytecode-string BYTE-CODE, constant
2960 vector CONSTANTS, maximum stack size DEPTH, (optional) DOCSTRING,
2961 and (optional) INTERACTIVE-SPEC.
2962 The first four arguments are required; at most six have any
2964 The ARGLIST can be either like the one of `lambda', in which case the arguments
2965 will be dynamically bound before executing the byte code, or it can be an
2966 integer of the form NNNNNNNRMMMMMMM where the 7bit MMMMMMM specifies the
2967 minimum number of arguments, the 7-bit NNNNNNN specifies the maximum number
2968 of arguments (ignoring &rest) and the R bit specifies whether there is a &rest
2969 argument to catch the left-over arguments. If such an integer is used, the
2970 arguments will not be dynamically bound but will be instead pushed on the
2971 stack before executing the byte-code.
2972 usage: (make-byte-code ARGLIST BYTE-CODE CONSTANTS DEPTH &optional DOCSTRING INTERACTIVE-SPEC &rest ELEMENTS) */)
2973 (register size_t nargs
, Lisp_Object
*args
)
2975 register Lisp_Object len
, val
;
2977 register struct Lisp_Vector
*p
;
2979 XSETFASTINT (len
, nargs
);
2980 if (!NILP (Vpurify_flag
))
2981 val
= make_pure_vector ((EMACS_INT
) nargs
);
2983 val
= Fmake_vector (len
, Qnil
);
2985 if (nargs
> 1 && STRINGP (args
[1]) && STRING_MULTIBYTE (args
[1]))
2986 /* BYTECODE-STRING must have been produced by Emacs 20.2 or the
2987 earlier because they produced a raw 8-bit string for byte-code
2988 and now such a byte-code string is loaded as multibyte while
2989 raw 8-bit characters converted to multibyte form. Thus, now we
2990 must convert them back to the original unibyte form. */
2991 args
[1] = Fstring_as_unibyte (args
[1]);
2994 for (i
= 0; i
< nargs
; i
++)
2996 if (!NILP (Vpurify_flag
))
2997 args
[i
] = Fpurecopy (args
[i
]);
2998 p
->contents
[i
] = args
[i
];
3000 XSETPVECTYPE (p
, PVEC_COMPILED
);
3001 XSETCOMPILED (val
, p
);
3007 /***********************************************************************
3009 ***********************************************************************/
3011 /* Each symbol_block is just under 1020 bytes long, since malloc
3012 really allocates in units of powers of two and uses 4 bytes for its
3015 #define SYMBOL_BLOCK_SIZE \
3016 ((1020 - sizeof (struct symbol_block *)) / sizeof (struct Lisp_Symbol))
3020 /* Place `symbols' first, to preserve alignment. */
3021 struct Lisp_Symbol symbols
[SYMBOL_BLOCK_SIZE
];
3022 struct symbol_block
*next
;
3025 /* Current symbol block and index of first unused Lisp_Symbol
3028 static struct symbol_block
*symbol_block
;
3029 static int symbol_block_index
;
3031 /* List of free symbols. */
3033 static struct Lisp_Symbol
*symbol_free_list
;
3035 /* Total number of symbol blocks now in use. */
3037 static int n_symbol_blocks
;
3040 /* Initialize symbol allocation. */
3045 symbol_block
= NULL
;
3046 symbol_block_index
= SYMBOL_BLOCK_SIZE
;
3047 symbol_free_list
= 0;
3048 n_symbol_blocks
= 0;
3052 DEFUN ("make-symbol", Fmake_symbol
, Smake_symbol
, 1, 1, 0,
3053 doc
: /* Return a newly allocated uninterned symbol whose name is NAME.
3054 Its value and function definition are void, and its property list is nil. */)
3057 register Lisp_Object val
;
3058 register struct Lisp_Symbol
*p
;
3060 CHECK_STRING (name
);
3062 /* eassert (!handling_signal); */
3066 if (symbol_free_list
)
3068 XSETSYMBOL (val
, symbol_free_list
);
3069 symbol_free_list
= symbol_free_list
->next
;
3073 if (symbol_block_index
== SYMBOL_BLOCK_SIZE
)
3075 struct symbol_block
*new;
3076 new = (struct symbol_block
*) lisp_malloc (sizeof *new,
3078 new->next
= symbol_block
;
3080 symbol_block_index
= 0;
3083 XSETSYMBOL (val
, &symbol_block
->symbols
[symbol_block_index
]);
3084 symbol_block_index
++;
3087 MALLOC_UNBLOCK_INPUT
;
3092 p
->redirect
= SYMBOL_PLAINVAL
;
3093 SET_SYMBOL_VAL (p
, Qunbound
);
3094 p
->function
= Qunbound
;
3097 p
->interned
= SYMBOL_UNINTERNED
;
3099 p
->declared_special
= 0;
3100 consing_since_gc
+= sizeof (struct Lisp_Symbol
);
3107 /***********************************************************************
3108 Marker (Misc) Allocation
3109 ***********************************************************************/
3111 /* Allocation of markers and other objects that share that structure.
3112 Works like allocation of conses. */
3114 #define MARKER_BLOCK_SIZE \
3115 ((1020 - sizeof (struct marker_block *)) / sizeof (union Lisp_Misc))
3119 /* Place `markers' first, to preserve alignment. */
3120 union Lisp_Misc markers
[MARKER_BLOCK_SIZE
];
3121 struct marker_block
*next
;
3124 static struct marker_block
*marker_block
;
3125 static int marker_block_index
;
3127 static union Lisp_Misc
*marker_free_list
;
3129 /* Total number of marker blocks now in use. */
3131 static int n_marker_blocks
;
3136 marker_block
= NULL
;
3137 marker_block_index
= MARKER_BLOCK_SIZE
;
3138 marker_free_list
= 0;
3139 n_marker_blocks
= 0;
3142 /* Return a newly allocated Lisp_Misc object, with no substructure. */
3145 allocate_misc (void)
3149 /* eassert (!handling_signal); */
3153 if (marker_free_list
)
3155 XSETMISC (val
, marker_free_list
);
3156 marker_free_list
= marker_free_list
->u_free
.chain
;
3160 if (marker_block_index
== MARKER_BLOCK_SIZE
)
3162 struct marker_block
*new;
3163 new = (struct marker_block
*) lisp_malloc (sizeof *new,
3165 new->next
= marker_block
;
3167 marker_block_index
= 0;
3169 total_free_markers
+= MARKER_BLOCK_SIZE
;
3171 XSETMISC (val
, &marker_block
->markers
[marker_block_index
]);
3172 marker_block_index
++;
3175 MALLOC_UNBLOCK_INPUT
;
3177 --total_free_markers
;
3178 consing_since_gc
+= sizeof (union Lisp_Misc
);
3179 misc_objects_consed
++;
3180 XMISCANY (val
)->gcmarkbit
= 0;
3184 /* Free a Lisp_Misc object */
3187 free_misc (Lisp_Object misc
)
3189 XMISCTYPE (misc
) = Lisp_Misc_Free
;
3190 XMISC (misc
)->u_free
.chain
= marker_free_list
;
3191 marker_free_list
= XMISC (misc
);
3193 total_free_markers
++;
3196 /* Return a Lisp_Misc_Save_Value object containing POINTER and
3197 INTEGER. This is used to package C values to call record_unwind_protect.
3198 The unwind function can get the C values back using XSAVE_VALUE. */
3201 make_save_value (void *pointer
, int integer
)
3203 register Lisp_Object val
;
3204 register struct Lisp_Save_Value
*p
;
3206 val
= allocate_misc ();
3207 XMISCTYPE (val
) = Lisp_Misc_Save_Value
;
3208 p
= XSAVE_VALUE (val
);
3209 p
->pointer
= pointer
;
3210 p
->integer
= integer
;
3215 DEFUN ("make-marker", Fmake_marker
, Smake_marker
, 0, 0, 0,
3216 doc
: /* Return a newly allocated marker which does not point at any place. */)
3219 register Lisp_Object val
;
3220 register struct Lisp_Marker
*p
;
3222 val
= allocate_misc ();
3223 XMISCTYPE (val
) = Lisp_Misc_Marker
;
3229 p
->insertion_type
= 0;
3233 /* Put MARKER back on the free list after using it temporarily. */
3236 free_marker (Lisp_Object marker
)
3238 unchain_marker (XMARKER (marker
));
3243 /* Return a newly created vector or string with specified arguments as
3244 elements. If all the arguments are characters that can fit
3245 in a string of events, make a string; otherwise, make a vector.
3247 Any number of arguments, even zero arguments, are allowed. */
3250 make_event_array (register int nargs
, Lisp_Object
*args
)
3254 for (i
= 0; i
< nargs
; i
++)
3255 /* The things that fit in a string
3256 are characters that are in 0...127,
3257 after discarding the meta bit and all the bits above it. */
3258 if (!INTEGERP (args
[i
])
3259 || (XINT (args
[i
]) & ~(-CHAR_META
)) >= 0200)
3260 return Fvector (nargs
, args
);
3262 /* Since the loop exited, we know that all the things in it are
3263 characters, so we can make a string. */
3267 result
= Fmake_string (make_number (nargs
), make_number (0));
3268 for (i
= 0; i
< nargs
; i
++)
3270 SSET (result
, i
, XINT (args
[i
]));
3271 /* Move the meta bit to the right place for a string char. */
3272 if (XINT (args
[i
]) & CHAR_META
)
3273 SSET (result
, i
, SREF (result
, i
) | 0x80);
3282 /************************************************************************
3283 Memory Full Handling
3284 ************************************************************************/
3287 /* Called if malloc (NBYTES) returns zero. If NBYTES == SIZE_MAX,
3288 there may have been size_t overflow so that malloc was never
3289 called, or perhaps malloc was invoked successfully but the
3290 resulting pointer had problems fitting into a tagged EMACS_INT. In
3291 either case this counts as memory being full even though malloc did
3295 memory_full (size_t nbytes
)
3297 /* Do not go into hysterics merely because a large request failed. */
3298 int enough_free_memory
= 0;
3299 if (SPARE_MEMORY
< nbytes
)
3301 void *p
= malloc (SPARE_MEMORY
);
3305 enough_free_memory
= 1;
3309 if (! enough_free_memory
)
3315 memory_full_cons_threshold
= sizeof (struct cons_block
);
3317 /* The first time we get here, free the spare memory. */
3318 for (i
= 0; i
< sizeof (spare_memory
) / sizeof (char *); i
++)
3319 if (spare_memory
[i
])
3322 free (spare_memory
[i
]);
3323 else if (i
>= 1 && i
<= 4)
3324 lisp_align_free (spare_memory
[i
]);
3326 lisp_free (spare_memory
[i
]);
3327 spare_memory
[i
] = 0;
3330 /* Record the space now used. When it decreases substantially,
3331 we can refill the memory reserve. */
3332 #if !defined SYSTEM_MALLOC && !defined SYNC_INPUT
3333 bytes_used_when_full
= BYTES_USED
;
3337 /* This used to call error, but if we've run out of memory, we could
3338 get infinite recursion trying to build the string. */
3339 xsignal (Qnil
, Vmemory_signal_data
);
3342 /* If we released our reserve (due to running out of memory),
3343 and we have a fair amount free once again,
3344 try to set aside another reserve in case we run out once more.
3346 This is called when a relocatable block is freed in ralloc.c,
3347 and also directly from this file, in case we're not using ralloc.c. */
3350 refill_memory_reserve (void)
3352 #ifndef SYSTEM_MALLOC
3353 if (spare_memory
[0] == 0)
3354 spare_memory
[0] = (char *) malloc ((size_t) SPARE_MEMORY
);
3355 if (spare_memory
[1] == 0)
3356 spare_memory
[1] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3358 if (spare_memory
[2] == 0)
3359 spare_memory
[2] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3361 if (spare_memory
[3] == 0)
3362 spare_memory
[3] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3364 if (spare_memory
[4] == 0)
3365 spare_memory
[4] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3367 if (spare_memory
[5] == 0)
3368 spare_memory
[5] = (char *) lisp_malloc (sizeof (struct string_block
),
3370 if (spare_memory
[6] == 0)
3371 spare_memory
[6] = (char *) lisp_malloc (sizeof (struct string_block
),
3373 if (spare_memory
[0] && spare_memory
[1] && spare_memory
[5])
3374 Vmemory_full
= Qnil
;
3378 /************************************************************************
3380 ************************************************************************/
3382 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
3384 /* Conservative C stack marking requires a method to identify possibly
3385 live Lisp objects given a pointer value. We do this by keeping
3386 track of blocks of Lisp data that are allocated in a red-black tree
3387 (see also the comment of mem_node which is the type of nodes in
3388 that tree). Function lisp_malloc adds information for an allocated
3389 block to the red-black tree with calls to mem_insert, and function
3390 lisp_free removes it with mem_delete. Functions live_string_p etc
3391 call mem_find to lookup information about a given pointer in the
3392 tree, and use that to determine if the pointer points to a Lisp
3395 /* Initialize this part of alloc.c. */
3400 mem_z
.left
= mem_z
.right
= MEM_NIL
;
3401 mem_z
.parent
= NULL
;
3402 mem_z
.color
= MEM_BLACK
;
3403 mem_z
.start
= mem_z
.end
= NULL
;
3408 /* Value is a pointer to the mem_node containing START. Value is
3409 MEM_NIL if there is no node in the tree containing START. */
3411 static inline struct mem_node
*
3412 mem_find (void *start
)
3416 if (start
< min_heap_address
|| start
> max_heap_address
)
3419 /* Make the search always successful to speed up the loop below. */
3420 mem_z
.start
= start
;
3421 mem_z
.end
= (char *) start
+ 1;
3424 while (start
< p
->start
|| start
>= p
->end
)
3425 p
= start
< p
->start
? p
->left
: p
->right
;
3430 /* Insert a new node into the tree for a block of memory with start
3431 address START, end address END, and type TYPE. Value is a
3432 pointer to the node that was inserted. */
3434 static struct mem_node
*
3435 mem_insert (void *start
, void *end
, enum mem_type type
)
3437 struct mem_node
*c
, *parent
, *x
;
3439 if (min_heap_address
== NULL
|| start
< min_heap_address
)
3440 min_heap_address
= start
;
3441 if (max_heap_address
== NULL
|| end
> max_heap_address
)
3442 max_heap_address
= end
;
3444 /* See where in the tree a node for START belongs. In this
3445 particular application, it shouldn't happen that a node is already
3446 present. For debugging purposes, let's check that. */
3450 #if GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS
3452 while (c
!= MEM_NIL
)
3454 if (start
>= c
->start
&& start
< c
->end
)
3457 c
= start
< c
->start
? c
->left
: c
->right
;
3460 #else /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */
3462 while (c
!= MEM_NIL
)
3465 c
= start
< c
->start
? c
->left
: c
->right
;
3468 #endif /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */
3470 /* Create a new node. */
3471 #ifdef GC_MALLOC_CHECK
3472 x
= (struct mem_node
*) _malloc_internal (sizeof *x
);
3476 x
= (struct mem_node
*) xmalloc (sizeof *x
);
3482 x
->left
= x
->right
= MEM_NIL
;
3485 /* Insert it as child of PARENT or install it as root. */
3488 if (start
< parent
->start
)
3496 /* Re-establish red-black tree properties. */
3497 mem_insert_fixup (x
);
3503 /* Re-establish the red-black properties of the tree, and thereby
3504 balance the tree, after node X has been inserted; X is always red. */
3507 mem_insert_fixup (struct mem_node
*x
)
3509 while (x
!= mem_root
&& x
->parent
->color
== MEM_RED
)
3511 /* X is red and its parent is red. This is a violation of
3512 red-black tree property #3. */
3514 if (x
->parent
== x
->parent
->parent
->left
)
3516 /* We're on the left side of our grandparent, and Y is our
3518 struct mem_node
*y
= x
->parent
->parent
->right
;
3520 if (y
->color
== MEM_RED
)
3522 /* Uncle and parent are red but should be black because
3523 X is red. Change the colors accordingly and proceed
3524 with the grandparent. */
3525 x
->parent
->color
= MEM_BLACK
;
3526 y
->color
= MEM_BLACK
;
3527 x
->parent
->parent
->color
= MEM_RED
;
3528 x
= x
->parent
->parent
;
3532 /* Parent and uncle have different colors; parent is
3533 red, uncle is black. */
3534 if (x
== x
->parent
->right
)
3537 mem_rotate_left (x
);
3540 x
->parent
->color
= MEM_BLACK
;
3541 x
->parent
->parent
->color
= MEM_RED
;
3542 mem_rotate_right (x
->parent
->parent
);
3547 /* This is the symmetrical case of above. */
3548 struct mem_node
*y
= x
->parent
->parent
->left
;
3550 if (y
->color
== MEM_RED
)
3552 x
->parent
->color
= MEM_BLACK
;
3553 y
->color
= MEM_BLACK
;
3554 x
->parent
->parent
->color
= MEM_RED
;
3555 x
= x
->parent
->parent
;
3559 if (x
== x
->parent
->left
)
3562 mem_rotate_right (x
);
3565 x
->parent
->color
= MEM_BLACK
;
3566 x
->parent
->parent
->color
= MEM_RED
;
3567 mem_rotate_left (x
->parent
->parent
);
3572 /* The root may have been changed to red due to the algorithm. Set
3573 it to black so that property #5 is satisfied. */
3574 mem_root
->color
= MEM_BLACK
;
3585 mem_rotate_left (struct mem_node
*x
)
3589 /* Turn y's left sub-tree into x's right sub-tree. */
3592 if (y
->left
!= MEM_NIL
)
3593 y
->left
->parent
= x
;
3595 /* Y's parent was x's parent. */
3597 y
->parent
= x
->parent
;
3599 /* Get the parent to point to y instead of x. */
3602 if (x
== x
->parent
->left
)
3603 x
->parent
->left
= y
;
3605 x
->parent
->right
= y
;
3610 /* Put x on y's left. */
3624 mem_rotate_right (struct mem_node
*x
)
3626 struct mem_node
*y
= x
->left
;
3629 if (y
->right
!= MEM_NIL
)
3630 y
->right
->parent
= x
;
3633 y
->parent
= x
->parent
;
3636 if (x
== x
->parent
->right
)
3637 x
->parent
->right
= y
;
3639 x
->parent
->left
= y
;
3650 /* Delete node Z from the tree. If Z is null or MEM_NIL, do nothing. */
3653 mem_delete (struct mem_node
*z
)
3655 struct mem_node
*x
, *y
;
3657 if (!z
|| z
== MEM_NIL
)
3660 if (z
->left
== MEM_NIL
|| z
->right
== MEM_NIL
)
3665 while (y
->left
!= MEM_NIL
)
3669 if (y
->left
!= MEM_NIL
)
3674 x
->parent
= y
->parent
;
3677 if (y
== y
->parent
->left
)
3678 y
->parent
->left
= x
;
3680 y
->parent
->right
= x
;
3687 z
->start
= y
->start
;
3692 if (y
->color
== MEM_BLACK
)
3693 mem_delete_fixup (x
);
3695 #ifdef GC_MALLOC_CHECK
3703 /* Re-establish the red-black properties of the tree, after a
3707 mem_delete_fixup (struct mem_node
*x
)
3709 while (x
!= mem_root
&& x
->color
== MEM_BLACK
)
3711 if (x
== x
->parent
->left
)
3713 struct mem_node
*w
= x
->parent
->right
;
3715 if (w
->color
== MEM_RED
)
3717 w
->color
= MEM_BLACK
;
3718 x
->parent
->color
= MEM_RED
;
3719 mem_rotate_left (x
->parent
);
3720 w
= x
->parent
->right
;
3723 if (w
->left
->color
== MEM_BLACK
&& w
->right
->color
== MEM_BLACK
)
3730 if (w
->right
->color
== MEM_BLACK
)
3732 w
->left
->color
= MEM_BLACK
;
3734 mem_rotate_right (w
);
3735 w
= x
->parent
->right
;
3737 w
->color
= x
->parent
->color
;
3738 x
->parent
->color
= MEM_BLACK
;
3739 w
->right
->color
= MEM_BLACK
;
3740 mem_rotate_left (x
->parent
);
3746 struct mem_node
*w
= x
->parent
->left
;
3748 if (w
->color
== MEM_RED
)
3750 w
->color
= MEM_BLACK
;
3751 x
->parent
->color
= MEM_RED
;
3752 mem_rotate_right (x
->parent
);
3753 w
= x
->parent
->left
;
3756 if (w
->right
->color
== MEM_BLACK
&& w
->left
->color
== MEM_BLACK
)
3763 if (w
->left
->color
== MEM_BLACK
)
3765 w
->right
->color
= MEM_BLACK
;
3767 mem_rotate_left (w
);
3768 w
= x
->parent
->left
;
3771 w
->color
= x
->parent
->color
;
3772 x
->parent
->color
= MEM_BLACK
;
3773 w
->left
->color
= MEM_BLACK
;
3774 mem_rotate_right (x
->parent
);
3780 x
->color
= MEM_BLACK
;
3784 /* Value is non-zero if P is a pointer to a live Lisp string on
3785 the heap. M is a pointer to the mem_block for P. */
3788 live_string_p (struct mem_node
*m
, void *p
)
3790 if (m
->type
== MEM_TYPE_STRING
)
3792 struct string_block
*b
= (struct string_block
*) m
->start
;
3793 ptrdiff_t offset
= (char *) p
- (char *) &b
->strings
[0];
3795 /* P must point to the start of a Lisp_String structure, and it
3796 must not be on the free-list. */
3798 && offset
% sizeof b
->strings
[0] == 0
3799 && offset
< (STRING_BLOCK_SIZE
* sizeof b
->strings
[0])
3800 && ((struct Lisp_String
*) p
)->data
!= NULL
);
3807 /* Value is non-zero if P is a pointer to a live Lisp cons on
3808 the heap. M is a pointer to the mem_block for P. */
3811 live_cons_p (struct mem_node
*m
, void *p
)
3813 if (m
->type
== MEM_TYPE_CONS
)
3815 struct cons_block
*b
= (struct cons_block
*) m
->start
;
3816 ptrdiff_t offset
= (char *) p
- (char *) &b
->conses
[0];
3818 /* P must point to the start of a Lisp_Cons, not be
3819 one of the unused cells in the current cons block,
3820 and not be on the free-list. */
3822 && offset
% sizeof b
->conses
[0] == 0
3823 && offset
< (CONS_BLOCK_SIZE
* sizeof b
->conses
[0])
3825 || offset
/ sizeof b
->conses
[0] < cons_block_index
)
3826 && !EQ (((struct Lisp_Cons
*) p
)->car
, Vdead
));
3833 /* Value is non-zero if P is a pointer to a live Lisp symbol on
3834 the heap. M is a pointer to the mem_block for P. */
3837 live_symbol_p (struct mem_node
*m
, void *p
)
3839 if (m
->type
== MEM_TYPE_SYMBOL
)
3841 struct symbol_block
*b
= (struct symbol_block
*) m
->start
;
3842 ptrdiff_t offset
= (char *) p
- (char *) &b
->symbols
[0];
3844 /* P must point to the start of a Lisp_Symbol, not be
3845 one of the unused cells in the current symbol block,
3846 and not be on the free-list. */
3848 && offset
% sizeof b
->symbols
[0] == 0
3849 && offset
< (SYMBOL_BLOCK_SIZE
* sizeof b
->symbols
[0])
3850 && (b
!= symbol_block
3851 || offset
/ sizeof b
->symbols
[0] < symbol_block_index
)
3852 && !EQ (((struct Lisp_Symbol
*) p
)->function
, Vdead
));
3859 /* Value is non-zero if P is a pointer to a live Lisp float on
3860 the heap. M is a pointer to the mem_block for P. */
3863 live_float_p (struct mem_node
*m
, void *p
)
3865 if (m
->type
== MEM_TYPE_FLOAT
)
3867 struct float_block
*b
= (struct float_block
*) m
->start
;
3868 ptrdiff_t offset
= (char *) p
- (char *) &b
->floats
[0];
3870 /* P must point to the start of a Lisp_Float and not be
3871 one of the unused cells in the current float block. */
3873 && offset
% sizeof b
->floats
[0] == 0
3874 && offset
< (FLOAT_BLOCK_SIZE
* sizeof b
->floats
[0])
3875 && (b
!= float_block
3876 || offset
/ sizeof b
->floats
[0] < float_block_index
));
3883 /* Value is non-zero if P is a pointer to a live Lisp Misc on
3884 the heap. M is a pointer to the mem_block for P. */
3887 live_misc_p (struct mem_node
*m
, void *p
)
3889 if (m
->type
== MEM_TYPE_MISC
)
3891 struct marker_block
*b
= (struct marker_block
*) m
->start
;
3892 ptrdiff_t offset
= (char *) p
- (char *) &b
->markers
[0];
3894 /* P must point to the start of a Lisp_Misc, not be
3895 one of the unused cells in the current misc block,
3896 and not be on the free-list. */
3898 && offset
% sizeof b
->markers
[0] == 0
3899 && offset
< (MARKER_BLOCK_SIZE
* sizeof b
->markers
[0])
3900 && (b
!= marker_block
3901 || offset
/ sizeof b
->markers
[0] < marker_block_index
)
3902 && ((union Lisp_Misc
*) p
)->u_any
.type
!= Lisp_Misc_Free
);
3909 /* Value is non-zero if P is a pointer to a live vector-like object.
3910 M is a pointer to the mem_block for P. */
3913 live_vector_p (struct mem_node
*m
, void *p
)
3915 return (p
== m
->start
&& m
->type
== MEM_TYPE_VECTORLIKE
);
3919 /* Value is non-zero if P is a pointer to a live buffer. M is a
3920 pointer to the mem_block for P. */
3923 live_buffer_p (struct mem_node
*m
, void *p
)
3925 /* P must point to the start of the block, and the buffer
3926 must not have been killed. */
3927 return (m
->type
== MEM_TYPE_BUFFER
3929 && !NILP (((struct buffer
*) p
)->BUFFER_INTERNAL_FIELD (name
)));
3932 #endif /* GC_MARK_STACK || defined GC_MALLOC_CHECK */
3936 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
3938 /* Array of objects that are kept alive because the C stack contains
3939 a pattern that looks like a reference to them . */
3941 #define MAX_ZOMBIES 10
3942 static Lisp_Object zombies
[MAX_ZOMBIES
];
3944 /* Number of zombie objects. */
3946 static int nzombies
;
3948 /* Number of garbage collections. */
3952 /* Average percentage of zombies per collection. */
3954 static double avg_zombies
;
3956 /* Max. number of live and zombie objects. */
3958 static int max_live
, max_zombies
;
3960 /* Average number of live objects per GC. */
3962 static double avg_live
;
3964 DEFUN ("gc-status", Fgc_status
, Sgc_status
, 0, 0, "",
3965 doc
: /* Show information about live and zombie objects. */)
3968 Lisp_Object args
[8], zombie_list
= Qnil
;
3970 for (i
= 0; i
< nzombies
; i
++)
3971 zombie_list
= Fcons (zombies
[i
], zombie_list
);
3972 args
[0] = build_string ("%d GCs, avg live/zombies = %.2f/%.2f (%f%%), max %d/%d\nzombies: %S");
3973 args
[1] = make_number (ngcs
);
3974 args
[2] = make_float (avg_live
);
3975 args
[3] = make_float (avg_zombies
);
3976 args
[4] = make_float (avg_zombies
/ avg_live
/ 100);
3977 args
[5] = make_number (max_live
);
3978 args
[6] = make_number (max_zombies
);
3979 args
[7] = zombie_list
;
3980 return Fmessage (8, args
);
3983 #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */
3986 /* Mark OBJ if we can prove it's a Lisp_Object. */
3989 mark_maybe_object (Lisp_Object obj
)
3997 po
= (void *) XPNTR (obj
);
4004 switch (XTYPE (obj
))
4007 mark_p
= (live_string_p (m
, po
)
4008 && !STRING_MARKED_P ((struct Lisp_String
*) po
));
4012 mark_p
= (live_cons_p (m
, po
) && !CONS_MARKED_P (XCONS (obj
)));
4016 mark_p
= (live_symbol_p (m
, po
) && !XSYMBOL (obj
)->gcmarkbit
);
4020 mark_p
= (live_float_p (m
, po
) && !FLOAT_MARKED_P (XFLOAT (obj
)));
4023 case Lisp_Vectorlike
:
4024 /* Note: can't check BUFFERP before we know it's a
4025 buffer because checking that dereferences the pointer
4026 PO which might point anywhere. */
4027 if (live_vector_p (m
, po
))
4028 mark_p
= !SUBRP (obj
) && !VECTOR_MARKED_P (XVECTOR (obj
));
4029 else if (live_buffer_p (m
, po
))
4030 mark_p
= BUFFERP (obj
) && !VECTOR_MARKED_P (XBUFFER (obj
));
4034 mark_p
= (live_misc_p (m
, po
) && !XMISCANY (obj
)->gcmarkbit
);
4043 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4044 if (nzombies
< MAX_ZOMBIES
)
4045 zombies
[nzombies
] = obj
;
4054 /* If P points to Lisp data, mark that as live if it isn't already
4058 mark_maybe_pointer (void *p
)
4062 /* Quickly rule out some values which can't point to Lisp data. */
4065 8 /* USE_LSB_TAG needs Lisp data to be aligned on multiples of 8. */
4067 2 /* We assume that Lisp data is aligned on even addresses. */
4075 Lisp_Object obj
= Qnil
;
4079 case MEM_TYPE_NON_LISP
:
4080 /* Nothing to do; not a pointer to Lisp memory. */
4083 case MEM_TYPE_BUFFER
:
4084 if (live_buffer_p (m
, p
) && !VECTOR_MARKED_P((struct buffer
*)p
))
4085 XSETVECTOR (obj
, p
);
4089 if (live_cons_p (m
, p
) && !CONS_MARKED_P ((struct Lisp_Cons
*) p
))
4093 case MEM_TYPE_STRING
:
4094 if (live_string_p (m
, p
)
4095 && !STRING_MARKED_P ((struct Lisp_String
*) p
))
4096 XSETSTRING (obj
, p
);
4100 if (live_misc_p (m
, p
) && !((struct Lisp_Free
*) p
)->gcmarkbit
)
4104 case MEM_TYPE_SYMBOL
:
4105 if (live_symbol_p (m
, p
) && !((struct Lisp_Symbol
*) p
)->gcmarkbit
)
4106 XSETSYMBOL (obj
, p
);
4109 case MEM_TYPE_FLOAT
:
4110 if (live_float_p (m
, p
) && !FLOAT_MARKED_P (p
))
4114 case MEM_TYPE_VECTORLIKE
:
4115 if (live_vector_p (m
, p
))
4118 XSETVECTOR (tem
, p
);
4119 if (!SUBRP (tem
) && !VECTOR_MARKED_P (XVECTOR (tem
)))
4134 /* Mark Lisp objects referenced from the address range START+OFFSET..END
4135 or END+OFFSET..START. */
4138 mark_memory (void *start
, void *end
, int offset
)
4143 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4147 /* Make START the pointer to the start of the memory region,
4148 if it isn't already. */
4156 /* Mark Lisp_Objects. */
4157 for (p
= (Lisp_Object
*) ((char *) start
+ offset
); (void *) p
< end
; ++p
)
4158 mark_maybe_object (*p
);
4160 /* Mark Lisp data pointed to. This is necessary because, in some
4161 situations, the C compiler optimizes Lisp objects away, so that
4162 only a pointer to them remains. Example:
4164 DEFUN ("testme", Ftestme, Stestme, 0, 0, 0, "")
4167 Lisp_Object obj = build_string ("test");
4168 struct Lisp_String *s = XSTRING (obj);
4169 Fgarbage_collect ();
4170 fprintf (stderr, "test `%s'\n", s->data);
4174 Here, `obj' isn't really used, and the compiler optimizes it
4175 away. The only reference to the life string is through the
4178 for (pp
= (void **) ((char *) start
+ offset
); (void *) pp
< end
; ++pp
)
4179 mark_maybe_pointer (*pp
);
4182 /* setjmp will work with GCC unless NON_SAVING_SETJMP is defined in
4183 the GCC system configuration. In gcc 3.2, the only systems for
4184 which this is so are i386-sco5 non-ELF, i386-sysv3 (maybe included
4185 by others?) and ns32k-pc532-min. */
4187 #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS
4189 static int setjmp_tested_p
, longjmps_done
;
4191 #define SETJMP_WILL_LIKELY_WORK "\
4193 Emacs garbage collector has been changed to use conservative stack\n\
4194 marking. Emacs has determined that the method it uses to do the\n\
4195 marking will likely work on your system, but this isn't sure.\n\
4197 If you are a system-programmer, or can get the help of a local wizard\n\
4198 who is, please take a look at the function mark_stack in alloc.c, and\n\
4199 verify that the methods used are appropriate for your system.\n\
4201 Please mail the result to <emacs-devel@gnu.org>.\n\
4204 #define SETJMP_WILL_NOT_WORK "\
4206 Emacs garbage collector has been changed to use conservative stack\n\
4207 marking. Emacs has determined that the default method it uses to do the\n\
4208 marking will not work on your system. We will need a system-dependent\n\
4209 solution for your system.\n\
4211 Please take a look at the function mark_stack in alloc.c, and\n\
4212 try to find a way to make it work on your system.\n\
4214 Note that you may get false negatives, depending on the compiler.\n\
4215 In particular, you need to use -O with GCC for this test.\n\
4217 Please mail the result to <emacs-devel@gnu.org>.\n\
4221 /* Perform a quick check if it looks like setjmp saves registers in a
4222 jmp_buf. Print a message to stderr saying so. When this test
4223 succeeds, this is _not_ a proof that setjmp is sufficient for
4224 conservative stack marking. Only the sources or a disassembly
4235 /* Arrange for X to be put in a register. */
4241 if (longjmps_done
== 1)
4243 /* Came here after the longjmp at the end of the function.
4245 If x == 1, the longjmp has restored the register to its
4246 value before the setjmp, and we can hope that setjmp
4247 saves all such registers in the jmp_buf, although that
4250 For other values of X, either something really strange is
4251 taking place, or the setjmp just didn't save the register. */
4254 fprintf (stderr
, SETJMP_WILL_LIKELY_WORK
);
4257 fprintf (stderr
, SETJMP_WILL_NOT_WORK
);
4264 if (longjmps_done
== 1)
4268 #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */
4271 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
4273 /* Abort if anything GCPRO'd doesn't survive the GC. */
4281 for (p
= gcprolist
; p
; p
= p
->next
)
4282 for (i
= 0; i
< p
->nvars
; ++i
)
4283 if (!survives_gc_p (p
->var
[i
]))
4284 /* FIXME: It's not necessarily a bug. It might just be that the
4285 GCPRO is unnecessary or should release the object sooner. */
4289 #elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4296 fprintf (stderr
, "\nZombies kept alive = %d:\n", nzombies
);
4297 for (i
= 0; i
< min (MAX_ZOMBIES
, nzombies
); ++i
)
4299 fprintf (stderr
, " %d = ", i
);
4300 debug_print (zombies
[i
]);
4304 #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */
4307 /* Mark live Lisp objects on the C stack.
4309 There are several system-dependent problems to consider when
4310 porting this to new architectures:
4314 We have to mark Lisp objects in CPU registers that can hold local
4315 variables or are used to pass parameters.
4317 If GC_SAVE_REGISTERS_ON_STACK is defined, it should expand to
4318 something that either saves relevant registers on the stack, or
4319 calls mark_maybe_object passing it each register's contents.
4321 If GC_SAVE_REGISTERS_ON_STACK is not defined, the current
4322 implementation assumes that calling setjmp saves registers we need
4323 to see in a jmp_buf which itself lies on the stack. This doesn't
4324 have to be true! It must be verified for each system, possibly
4325 by taking a look at the source code of setjmp.
4327 If __builtin_unwind_init is available (defined by GCC >= 2.8) we
4328 can use it as a machine independent method to store all registers
4329 to the stack. In this case the macros described in the previous
4330 two paragraphs are not used.
4334 Architectures differ in the way their processor stack is organized.
4335 For example, the stack might look like this
4338 | Lisp_Object | size = 4
4340 | something else | size = 2
4342 | Lisp_Object | size = 4
4346 In such a case, not every Lisp_Object will be aligned equally. To
4347 find all Lisp_Object on the stack it won't be sufficient to walk
4348 the stack in steps of 4 bytes. Instead, two passes will be
4349 necessary, one starting at the start of the stack, and a second
4350 pass starting at the start of the stack + 2. Likewise, if the
4351 minimal alignment of Lisp_Objects on the stack is 1, four passes
4352 would be necessary, each one starting with one byte more offset
4353 from the stack start.
4355 The current code assumes by default that Lisp_Objects are aligned
4356 equally on the stack. */
4364 #ifdef HAVE___BUILTIN_UNWIND_INIT
4365 /* Force callee-saved registers and register windows onto the stack.
4366 This is the preferred method if available, obviating the need for
4367 machine dependent methods. */
4368 __builtin_unwind_init ();
4370 #else /* not HAVE___BUILTIN_UNWIND_INIT */
4371 #ifndef GC_SAVE_REGISTERS_ON_STACK
4372 /* jmp_buf may not be aligned enough on darwin-ppc64 */
4373 union aligned_jmpbuf
{
4377 volatile int stack_grows_down_p
= (char *) &j
> (char *) stack_base
;
4379 /* This trick flushes the register windows so that all the state of
4380 the process is contained in the stack. */
4381 /* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is
4382 needed on ia64 too. See mach_dep.c, where it also says inline
4383 assembler doesn't work with relevant proprietary compilers. */
4385 #if defined (__sparc64__) && defined (__FreeBSD__)
4386 /* FreeBSD does not have a ta 3 handler. */
4393 /* Save registers that we need to see on the stack. We need to see
4394 registers used to hold register variables and registers used to
4396 #ifdef GC_SAVE_REGISTERS_ON_STACK
4397 GC_SAVE_REGISTERS_ON_STACK (end
);
4398 #else /* not GC_SAVE_REGISTERS_ON_STACK */
4400 #ifndef GC_SETJMP_WORKS /* If it hasn't been checked yet that
4401 setjmp will definitely work, test it
4402 and print a message with the result
4404 if (!setjmp_tested_p
)
4406 setjmp_tested_p
= 1;
4409 #endif /* GC_SETJMP_WORKS */
4412 end
= stack_grows_down_p
? (char *) &j
+ sizeof j
: (char *) &j
;
4413 #endif /* not GC_SAVE_REGISTERS_ON_STACK */
4414 #endif /* not HAVE___BUILTIN_UNWIND_INIT */
4416 /* This assumes that the stack is a contiguous region in memory. If
4417 that's not the case, something has to be done here to iterate
4418 over the stack segments. */
4419 #ifndef GC_LISP_OBJECT_ALIGNMENT
4421 #define GC_LISP_OBJECT_ALIGNMENT __alignof__ (Lisp_Object)
4423 #define GC_LISP_OBJECT_ALIGNMENT sizeof (Lisp_Object)
4426 for (i
= 0; i
< sizeof (Lisp_Object
); i
+= GC_LISP_OBJECT_ALIGNMENT
)
4427 mark_memory (stack_base
, end
, i
);
4428 /* Allow for marking a secondary stack, like the register stack on the
4430 #ifdef GC_MARK_SECONDARY_STACK
4431 GC_MARK_SECONDARY_STACK ();
4434 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
4439 #endif /* GC_MARK_STACK != 0 */
4442 /* Determine whether it is safe to access memory at address P. */
4444 valid_pointer_p (void *p
)
4447 return w32_valid_pointer_p (p
, 16);
4451 /* Obviously, we cannot just access it (we would SEGV trying), so we
4452 trick the o/s to tell us whether p is a valid pointer.
4453 Unfortunately, we cannot use NULL_DEVICE here, as emacs_write may
4454 not validate p in that case. */
4456 if ((fd
= emacs_open ("__Valid__Lisp__Object__", O_CREAT
| O_WRONLY
| O_TRUNC
, 0666)) >= 0)
4458 int valid
= (emacs_write (fd
, (char *)p
, 16) == 16);
4460 unlink ("__Valid__Lisp__Object__");
4468 /* Return 1 if OBJ is a valid lisp object.
4469 Return 0 if OBJ is NOT a valid lisp object.
4470 Return -1 if we cannot validate OBJ.
4471 This function can be quite slow,
4472 so it should only be used in code for manual debugging. */
4475 valid_lisp_object_p (Lisp_Object obj
)
4485 p
= (void *) XPNTR (obj
);
4486 if (PURE_POINTER_P (p
))
4490 return valid_pointer_p (p
);
4497 int valid
= valid_pointer_p (p
);
4509 case MEM_TYPE_NON_LISP
:
4512 case MEM_TYPE_BUFFER
:
4513 return live_buffer_p (m
, p
);
4516 return live_cons_p (m
, p
);
4518 case MEM_TYPE_STRING
:
4519 return live_string_p (m
, p
);
4522 return live_misc_p (m
, p
);
4524 case MEM_TYPE_SYMBOL
:
4525 return live_symbol_p (m
, p
);
4527 case MEM_TYPE_FLOAT
:
4528 return live_float_p (m
, p
);
4530 case MEM_TYPE_VECTORLIKE
:
4531 return live_vector_p (m
, p
);
4544 /***********************************************************************
4545 Pure Storage Management
4546 ***********************************************************************/
4548 /* Allocate room for SIZE bytes from pure Lisp storage and return a
4549 pointer to it. TYPE is the Lisp type for which the memory is
4550 allocated. TYPE < 0 means it's not used for a Lisp object. */
4552 static POINTER_TYPE
*
4553 pure_alloc (size_t size
, int type
)
4555 POINTER_TYPE
*result
;
4557 size_t alignment
= (1 << GCTYPEBITS
);
4559 size_t alignment
= sizeof (EMACS_INT
);
4561 /* Give Lisp_Floats an extra alignment. */
4562 if (type
== Lisp_Float
)
4564 #if defined __GNUC__ && __GNUC__ >= 2
4565 alignment
= __alignof (struct Lisp_Float
);
4567 alignment
= sizeof (struct Lisp_Float
);
4575 /* Allocate space for a Lisp object from the beginning of the free
4576 space with taking account of alignment. */
4577 result
= ALIGN (purebeg
+ pure_bytes_used_lisp
, alignment
);
4578 pure_bytes_used_lisp
= ((char *)result
- (char *)purebeg
) + size
;
4582 /* Allocate space for a non-Lisp object from the end of the free
4584 pure_bytes_used_non_lisp
+= size
;
4585 result
= purebeg
+ pure_size
- pure_bytes_used_non_lisp
;
4587 pure_bytes_used
= pure_bytes_used_lisp
+ pure_bytes_used_non_lisp
;
4589 if (pure_bytes_used
<= pure_size
)
4592 /* Don't allocate a large amount here,
4593 because it might get mmap'd and then its address
4594 might not be usable. */
4595 purebeg
= (char *) xmalloc (10000);
4597 pure_bytes_used_before_overflow
+= pure_bytes_used
- size
;
4598 pure_bytes_used
= 0;
4599 pure_bytes_used_lisp
= pure_bytes_used_non_lisp
= 0;
4604 /* Print a warning if PURESIZE is too small. */
4607 check_pure_size (void)
4609 if (pure_bytes_used_before_overflow
)
4610 message (("emacs:0:Pure Lisp storage overflow (approx. %"pI
"d"
4612 pure_bytes_used
+ pure_bytes_used_before_overflow
);
4616 /* Find the byte sequence {DATA[0], ..., DATA[NBYTES-1], '\0'} from
4617 the non-Lisp data pool of the pure storage, and return its start
4618 address. Return NULL if not found. */
4621 find_string_data_in_pure (const char *data
, EMACS_INT nbytes
)
4624 EMACS_INT skip
, bm_skip
[256], last_char_skip
, infinity
, start
, start_max
;
4625 const unsigned char *p
;
4628 if (pure_bytes_used_non_lisp
< nbytes
+ 1)
4631 /* Set up the Boyer-Moore table. */
4633 for (i
= 0; i
< 256; i
++)
4636 p
= (const unsigned char *) data
;
4638 bm_skip
[*p
++] = skip
;
4640 last_char_skip
= bm_skip
['\0'];
4642 non_lisp_beg
= purebeg
+ pure_size
- pure_bytes_used_non_lisp
;
4643 start_max
= pure_bytes_used_non_lisp
- (nbytes
+ 1);
4645 /* See the comments in the function `boyer_moore' (search.c) for the
4646 use of `infinity'. */
4647 infinity
= pure_bytes_used_non_lisp
+ 1;
4648 bm_skip
['\0'] = infinity
;
4650 p
= (const unsigned char *) non_lisp_beg
+ nbytes
;
4654 /* Check the last character (== '\0'). */
4657 start
+= bm_skip
[*(p
+ start
)];
4659 while (start
<= start_max
);
4661 if (start
< infinity
)
4662 /* Couldn't find the last character. */
4665 /* No less than `infinity' means we could find the last
4666 character at `p[start - infinity]'. */
4669 /* Check the remaining characters. */
4670 if (memcmp (data
, non_lisp_beg
+ start
, nbytes
) == 0)
4672 return non_lisp_beg
+ start
;
4674 start
+= last_char_skip
;
4676 while (start
<= start_max
);
4682 /* Return a string allocated in pure space. DATA is a buffer holding
4683 NCHARS characters, and NBYTES bytes of string data. MULTIBYTE
4684 non-zero means make the result string multibyte.
4686 Must get an error if pure storage is full, since if it cannot hold
4687 a large string it may be able to hold conses that point to that
4688 string; then the string is not protected from gc. */
4691 make_pure_string (const char *data
,
4692 EMACS_INT nchars
, EMACS_INT nbytes
, int multibyte
)
4695 struct Lisp_String
*s
;
4697 s
= (struct Lisp_String
*) pure_alloc (sizeof *s
, Lisp_String
);
4698 s
->data
= (unsigned char *) find_string_data_in_pure (data
, nbytes
);
4699 if (s
->data
== NULL
)
4701 s
->data
= (unsigned char *) pure_alloc (nbytes
+ 1, -1);
4702 memcpy (s
->data
, data
, nbytes
);
4703 s
->data
[nbytes
] = '\0';
4706 s
->size_byte
= multibyte
? nbytes
: -1;
4707 s
->intervals
= NULL_INTERVAL
;
4708 XSETSTRING (string
, s
);
4712 /* Return a string a string allocated in pure space. Do not allocate
4713 the string data, just point to DATA. */
4716 make_pure_c_string (const char *data
)
4719 struct Lisp_String
*s
;
4720 EMACS_INT nchars
= strlen (data
);
4722 s
= (struct Lisp_String
*) pure_alloc (sizeof *s
, Lisp_String
);
4725 s
->data
= (unsigned char *) data
;
4726 s
->intervals
= NULL_INTERVAL
;
4727 XSETSTRING (string
, s
);
4731 /* Return a cons allocated from pure space. Give it pure copies
4732 of CAR as car and CDR as cdr. */
4735 pure_cons (Lisp_Object car
, Lisp_Object cdr
)
4737 register Lisp_Object
new;
4738 struct Lisp_Cons
*p
;
4740 p
= (struct Lisp_Cons
*) pure_alloc (sizeof *p
, Lisp_Cons
);
4742 XSETCAR (new, Fpurecopy (car
));
4743 XSETCDR (new, Fpurecopy (cdr
));
4748 /* Value is a float object with value NUM allocated from pure space. */
4751 make_pure_float (double num
)
4753 register Lisp_Object
new;
4754 struct Lisp_Float
*p
;
4756 p
= (struct Lisp_Float
*) pure_alloc (sizeof *p
, Lisp_Float
);
4758 XFLOAT_INIT (new, num
);
4763 /* Return a vector with room for LEN Lisp_Objects allocated from
4767 make_pure_vector (EMACS_INT len
)
4770 struct Lisp_Vector
*p
;
4771 size_t size
= (offsetof (struct Lisp_Vector
, contents
)
4772 + len
* sizeof (Lisp_Object
));
4774 p
= (struct Lisp_Vector
*) pure_alloc (size
, Lisp_Vectorlike
);
4775 XSETVECTOR (new, p
);
4776 XVECTOR (new)->header
.size
= len
;
4781 DEFUN ("purecopy", Fpurecopy
, Spurecopy
, 1, 1, 0,
4782 doc
: /* Make a copy of object OBJ in pure storage.
4783 Recursively copies contents of vectors and cons cells.
4784 Does not copy symbols. Copies strings without text properties. */)
4785 (register Lisp_Object obj
)
4787 if (NILP (Vpurify_flag
))
4790 if (PURE_POINTER_P (XPNTR (obj
)))
4793 if (HASH_TABLE_P (Vpurify_flag
)) /* Hash consing. */
4795 Lisp_Object tmp
= Fgethash (obj
, Vpurify_flag
, Qnil
);
4801 obj
= pure_cons (XCAR (obj
), XCDR (obj
));
4802 else if (FLOATP (obj
))
4803 obj
= make_pure_float (XFLOAT_DATA (obj
));
4804 else if (STRINGP (obj
))
4805 obj
= make_pure_string (SSDATA (obj
), SCHARS (obj
),
4807 STRING_MULTIBYTE (obj
));
4808 else if (COMPILEDP (obj
) || VECTORP (obj
))
4810 register struct Lisp_Vector
*vec
;
4811 register EMACS_INT i
;
4815 if (size
& PSEUDOVECTOR_FLAG
)
4816 size
&= PSEUDOVECTOR_SIZE_MASK
;
4817 vec
= XVECTOR (make_pure_vector (size
));
4818 for (i
= 0; i
< size
; i
++)
4819 vec
->contents
[i
] = Fpurecopy (XVECTOR (obj
)->contents
[i
]);
4820 if (COMPILEDP (obj
))
4822 XSETPVECTYPE (vec
, PVEC_COMPILED
);
4823 XSETCOMPILED (obj
, vec
);
4826 XSETVECTOR (obj
, vec
);
4828 else if (MARKERP (obj
))
4829 error ("Attempt to copy a marker to pure storage");
4831 /* Not purified, don't hash-cons. */
4834 if (HASH_TABLE_P (Vpurify_flag
)) /* Hash consing. */
4835 Fputhash (obj
, obj
, Vpurify_flag
);
4842 /***********************************************************************
4844 ***********************************************************************/
4846 /* Put an entry in staticvec, pointing at the variable with address
4850 staticpro (Lisp_Object
*varaddress
)
4852 staticvec
[staticidx
++] = varaddress
;
4853 if (staticidx
>= NSTATICS
)
4858 /***********************************************************************
4860 ***********************************************************************/
4862 /* Temporarily prevent garbage collection. */
4865 inhibit_garbage_collection (void)
4867 int count
= SPECPDL_INDEX ();
4868 int nbits
= min (VALBITS
, BITS_PER_INT
);
4870 specbind (Qgc_cons_threshold
, make_number (((EMACS_INT
) 1 << (nbits
- 1)) - 1));
4875 DEFUN ("garbage-collect", Fgarbage_collect
, Sgarbage_collect
, 0, 0, "",
4876 doc
: /* Reclaim storage for Lisp objects no longer needed.
4877 Garbage collection happens automatically if you cons more than
4878 `gc-cons-threshold' bytes of Lisp data since previous garbage collection.
4879 `garbage-collect' normally returns a list with info on amount of space in use:
4880 ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)
4881 (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS
4882 (USED-FLOATS . FREE-FLOATS) (USED-INTERVALS . FREE-INTERVALS)
4883 (USED-STRINGS . FREE-STRINGS))
4884 However, if there was overflow in pure space, `garbage-collect'
4885 returns nil, because real GC can't be done. */)
4888 register struct specbinding
*bind
;
4889 char stack_top_variable
;
4892 Lisp_Object total
[8];
4893 int count
= SPECPDL_INDEX ();
4894 EMACS_TIME t1
, t2
, t3
;
4899 /* Can't GC if pure storage overflowed because we can't determine
4900 if something is a pure object or not. */
4901 if (pure_bytes_used_before_overflow
)
4906 /* Don't keep undo information around forever.
4907 Do this early on, so it is no problem if the user quits. */
4909 register struct buffer
*nextb
= all_buffers
;
4913 /* If a buffer's undo list is Qt, that means that undo is
4914 turned off in that buffer. Calling truncate_undo_list on
4915 Qt tends to return NULL, which effectively turns undo back on.
4916 So don't call truncate_undo_list if undo_list is Qt. */
4917 if (! NILP (nextb
->BUFFER_INTERNAL_FIELD (name
)) && ! EQ (nextb
->BUFFER_INTERNAL_FIELD (undo_list
), Qt
))
4918 truncate_undo_list (nextb
);
4920 /* Shrink buffer gaps, but skip indirect and dead buffers. */
4921 if (nextb
->base_buffer
== 0 && !NILP (nextb
->BUFFER_INTERNAL_FIELD (name
))
4922 && ! nextb
->text
->inhibit_shrinking
)
4924 /* If a buffer's gap size is more than 10% of the buffer
4925 size, or larger than 2000 bytes, then shrink it
4926 accordingly. Keep a minimum size of 20 bytes. */
4927 int size
= min (2000, max (20, (nextb
->text
->z_byte
/ 10)));
4929 if (nextb
->text
->gap_size
> size
)
4931 struct buffer
*save_current
= current_buffer
;
4932 current_buffer
= nextb
;
4933 make_gap (-(nextb
->text
->gap_size
- size
));
4934 current_buffer
= save_current
;
4938 nextb
= nextb
->header
.next
.buffer
;
4942 EMACS_GET_TIME (t1
);
4944 /* In case user calls debug_print during GC,
4945 don't let that cause a recursive GC. */
4946 consing_since_gc
= 0;
4948 /* Save what's currently displayed in the echo area. */
4949 message_p
= push_message ();
4950 record_unwind_protect (pop_message_unwind
, Qnil
);
4952 /* Save a copy of the contents of the stack, for debugging. */
4953 #if MAX_SAVE_STACK > 0
4954 if (NILP (Vpurify_flag
))
4958 if (&stack_top_variable
< stack_bottom
)
4960 stack
= &stack_top_variable
;
4961 stack_size
= stack_bottom
- &stack_top_variable
;
4965 stack
= stack_bottom
;
4966 stack_size
= &stack_top_variable
- stack_bottom
;
4968 if (stack_size
<= MAX_SAVE_STACK
)
4970 if (stack_copy_size
< stack_size
)
4972 stack_copy
= (char *) xrealloc (stack_copy
, stack_size
);
4973 stack_copy_size
= stack_size
;
4975 memcpy (stack_copy
, stack
, stack_size
);
4978 #endif /* MAX_SAVE_STACK > 0 */
4980 if (garbage_collection_messages
)
4981 message1_nolog ("Garbage collecting...");
4985 shrink_regexp_cache ();
4989 /* clear_marks (); */
4991 /* Mark all the special slots that serve as the roots of accessibility. */
4993 for (i
= 0; i
< staticidx
; i
++)
4994 mark_object (*staticvec
[i
]);
4996 for (bind
= specpdl
; bind
!= specpdl_ptr
; bind
++)
4998 mark_object (bind
->symbol
);
4999 mark_object (bind
->old_value
);
5007 extern void xg_mark_data (void);
5012 #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \
5013 || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS)
5017 register struct gcpro
*tail
;
5018 for (tail
= gcprolist
; tail
; tail
= tail
->next
)
5019 for (i
= 0; i
< tail
->nvars
; i
++)
5020 mark_object (tail
->var
[i
]);
5024 struct catchtag
*catch;
5025 struct handler
*handler
;
5027 for (catch = catchlist
; catch; catch = catch->next
)
5029 mark_object (catch->tag
);
5030 mark_object (catch->val
);
5032 for (handler
= handlerlist
; handler
; handler
= handler
->next
)
5034 mark_object (handler
->handler
);
5035 mark_object (handler
->var
);
5041 #ifdef HAVE_WINDOW_SYSTEM
5042 mark_fringe_data ();
5045 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
5049 /* Everything is now marked, except for the things that require special
5050 finalization, i.e. the undo_list.
5051 Look thru every buffer's undo list
5052 for elements that update markers that were not marked,
5055 register struct buffer
*nextb
= all_buffers
;
5059 /* If a buffer's undo list is Qt, that means that undo is
5060 turned off in that buffer. Calling truncate_undo_list on
5061 Qt tends to return NULL, which effectively turns undo back on.
5062 So don't call truncate_undo_list if undo_list is Qt. */
5063 if (! EQ (nextb
->BUFFER_INTERNAL_FIELD (undo_list
), Qt
))
5065 Lisp_Object tail
, prev
;
5066 tail
= nextb
->BUFFER_INTERNAL_FIELD (undo_list
);
5068 while (CONSP (tail
))
5070 if (CONSP (XCAR (tail
))
5071 && MARKERP (XCAR (XCAR (tail
)))
5072 && !XMARKER (XCAR (XCAR (tail
)))->gcmarkbit
)
5075 nextb
->BUFFER_INTERNAL_FIELD (undo_list
) = tail
= XCDR (tail
);
5079 XSETCDR (prev
, tail
);
5089 /* Now that we have stripped the elements that need not be in the
5090 undo_list any more, we can finally mark the list. */
5091 mark_object (nextb
->BUFFER_INTERNAL_FIELD (undo_list
));
5093 nextb
= nextb
->header
.next
.buffer
;
5099 /* Clear the mark bits that we set in certain root slots. */
5101 unmark_byte_stack ();
5102 VECTOR_UNMARK (&buffer_defaults
);
5103 VECTOR_UNMARK (&buffer_local_symbols
);
5105 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES && 0
5113 /* clear_marks (); */
5116 consing_since_gc
= 0;
5117 if (gc_cons_threshold
< 10000)
5118 gc_cons_threshold
= 10000;
5120 if (FLOATP (Vgc_cons_percentage
))
5121 { /* Set gc_cons_combined_threshold. */
5124 tot
+= total_conses
* sizeof (struct Lisp_Cons
);
5125 tot
+= total_symbols
* sizeof (struct Lisp_Symbol
);
5126 tot
+= total_markers
* sizeof (union Lisp_Misc
);
5127 tot
+= total_string_size
;
5128 tot
+= total_vector_size
* sizeof (Lisp_Object
);
5129 tot
+= total_floats
* sizeof (struct Lisp_Float
);
5130 tot
+= total_intervals
* sizeof (struct interval
);
5131 tot
+= total_strings
* sizeof (struct Lisp_String
);
5133 gc_relative_threshold
= tot
* XFLOAT_DATA (Vgc_cons_percentage
);
5136 gc_relative_threshold
= 0;
5138 if (garbage_collection_messages
)
5140 if (message_p
|| minibuf_level
> 0)
5143 message1_nolog ("Garbage collecting...done");
5146 unbind_to (count
, Qnil
);
5148 total
[0] = Fcons (make_number (total_conses
),
5149 make_number (total_free_conses
));
5150 total
[1] = Fcons (make_number (total_symbols
),
5151 make_number (total_free_symbols
));
5152 total
[2] = Fcons (make_number (total_markers
),
5153 make_number (total_free_markers
));
5154 total
[3] = make_number (total_string_size
);
5155 total
[4] = make_number (total_vector_size
);
5156 total
[5] = Fcons (make_number (total_floats
),
5157 make_number (total_free_floats
));
5158 total
[6] = Fcons (make_number (total_intervals
),
5159 make_number (total_free_intervals
));
5160 total
[7] = Fcons (make_number (total_strings
),
5161 make_number (total_free_strings
));
5163 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
5165 /* Compute average percentage of zombies. */
5168 for (i
= 0; i
< 7; ++i
)
5169 if (CONSP (total
[i
]))
5170 nlive
+= XFASTINT (XCAR (total
[i
]));
5172 avg_live
= (avg_live
* ngcs
+ nlive
) / (ngcs
+ 1);
5173 max_live
= max (nlive
, max_live
);
5174 avg_zombies
= (avg_zombies
* ngcs
+ nzombies
) / (ngcs
+ 1);
5175 max_zombies
= max (nzombies
, max_zombies
);
5180 if (!NILP (Vpost_gc_hook
))
5182 int gc_count
= inhibit_garbage_collection ();
5183 safe_run_hooks (Qpost_gc_hook
);
5184 unbind_to (gc_count
, Qnil
);
5187 /* Accumulate statistics. */
5188 EMACS_GET_TIME (t2
);
5189 EMACS_SUB_TIME (t3
, t2
, t1
);
5190 if (FLOATP (Vgc_elapsed
))
5191 Vgc_elapsed
= make_float (XFLOAT_DATA (Vgc_elapsed
) +
5193 EMACS_USECS (t3
) * 1.0e-6);
5196 return Flist (sizeof total
/ sizeof *total
, total
);
5200 /* Mark Lisp objects in glyph matrix MATRIX. Currently the
5201 only interesting objects referenced from glyphs are strings. */
5204 mark_glyph_matrix (struct glyph_matrix
*matrix
)
5206 struct glyph_row
*row
= matrix
->rows
;
5207 struct glyph_row
*end
= row
+ matrix
->nrows
;
5209 for (; row
< end
; ++row
)
5213 for (area
= LEFT_MARGIN_AREA
; area
< LAST_AREA
; ++area
)
5215 struct glyph
*glyph
= row
->glyphs
[area
];
5216 struct glyph
*end_glyph
= glyph
+ row
->used
[area
];
5218 for (; glyph
< end_glyph
; ++glyph
)
5219 if (STRINGP (glyph
->object
)
5220 && !STRING_MARKED_P (XSTRING (glyph
->object
)))
5221 mark_object (glyph
->object
);
5227 /* Mark Lisp faces in the face cache C. */
5230 mark_face_cache (struct face_cache
*c
)
5235 for (i
= 0; i
< c
->used
; ++i
)
5237 struct face
*face
= FACE_FROM_ID (c
->f
, i
);
5241 for (j
= 0; j
< LFACE_VECTOR_SIZE
; ++j
)
5242 mark_object (face
->lface
[j
]);
5250 /* Mark reference to a Lisp_Object.
5251 If the object referred to has not been seen yet, recursively mark
5252 all the references contained in it. */
5254 #define LAST_MARKED_SIZE 500
5255 static Lisp_Object last_marked
[LAST_MARKED_SIZE
];
5256 static int last_marked_index
;
5258 /* For debugging--call abort when we cdr down this many
5259 links of a list, in mark_object. In debugging,
5260 the call to abort will hit a breakpoint.
5261 Normally this is zero and the check never goes off. */
5262 static size_t mark_object_loop_halt
;
5265 mark_vectorlike (struct Lisp_Vector
*ptr
)
5267 register EMACS_UINT size
= ptr
->header
.size
;
5268 register EMACS_UINT i
;
5270 eassert (!VECTOR_MARKED_P (ptr
));
5271 VECTOR_MARK (ptr
); /* Else mark it */
5272 if (size
& PSEUDOVECTOR_FLAG
)
5273 size
&= PSEUDOVECTOR_SIZE_MASK
;
5275 /* Note that this size is not the memory-footprint size, but only
5276 the number of Lisp_Object fields that we should trace.
5277 The distinction is used e.g. by Lisp_Process which places extra
5278 non-Lisp_Object fields at the end of the structure. */
5279 for (i
= 0; i
< size
; i
++) /* and then mark its elements */
5280 mark_object (ptr
->contents
[i
]);
5283 /* Like mark_vectorlike but optimized for char-tables (and
5284 sub-char-tables) assuming that the contents are mostly integers or
5288 mark_char_table (struct Lisp_Vector
*ptr
)
5290 register EMACS_UINT size
= ptr
->header
.size
& PSEUDOVECTOR_SIZE_MASK
;
5291 register EMACS_UINT i
;
5293 eassert (!VECTOR_MARKED_P (ptr
));
5295 for (i
= 0; i
< size
; i
++)
5297 Lisp_Object val
= ptr
->contents
[i
];
5299 if (INTEGERP (val
) || (SYMBOLP (val
) && XSYMBOL (val
)->gcmarkbit
))
5301 if (SUB_CHAR_TABLE_P (val
))
5303 if (! VECTOR_MARKED_P (XVECTOR (val
)))
5304 mark_char_table (XVECTOR (val
));
5312 mark_object (Lisp_Object arg
)
5314 register Lisp_Object obj
= arg
;
5315 #ifdef GC_CHECK_MARKED_OBJECTS
5319 size_t cdr_count
= 0;
5323 if (PURE_POINTER_P (XPNTR (obj
)))
5326 last_marked
[last_marked_index
++] = obj
;
5327 if (last_marked_index
== LAST_MARKED_SIZE
)
5328 last_marked_index
= 0;
5330 /* Perform some sanity checks on the objects marked here. Abort if
5331 we encounter an object we know is bogus. This increases GC time
5332 by ~80%, and requires compilation with GC_MARK_STACK != 0. */
5333 #ifdef GC_CHECK_MARKED_OBJECTS
5335 po
= (void *) XPNTR (obj
);
5337 /* Check that the object pointed to by PO is known to be a Lisp
5338 structure allocated from the heap. */
5339 #define CHECK_ALLOCATED() \
5341 m = mem_find (po); \
5346 /* Check that the object pointed to by PO is live, using predicate
5348 #define CHECK_LIVE(LIVEP) \
5350 if (!LIVEP (m, po)) \
5354 /* Check both of the above conditions. */
5355 #define CHECK_ALLOCATED_AND_LIVE(LIVEP) \
5357 CHECK_ALLOCATED (); \
5358 CHECK_LIVE (LIVEP); \
5361 #else /* not GC_CHECK_MARKED_OBJECTS */
5363 #define CHECK_LIVE(LIVEP) (void) 0
5364 #define CHECK_ALLOCATED_AND_LIVE(LIVEP) (void) 0
5366 #endif /* not GC_CHECK_MARKED_OBJECTS */
5368 switch (SWITCH_ENUM_CAST (XTYPE (obj
)))
5372 register struct Lisp_String
*ptr
= XSTRING (obj
);
5373 if (STRING_MARKED_P (ptr
))
5375 CHECK_ALLOCATED_AND_LIVE (live_string_p
);
5376 MARK_INTERVAL_TREE (ptr
->intervals
);
5378 #ifdef GC_CHECK_STRING_BYTES
5379 /* Check that the string size recorded in the string is the
5380 same as the one recorded in the sdata structure. */
5381 CHECK_STRING_BYTES (ptr
);
5382 #endif /* GC_CHECK_STRING_BYTES */
5386 case Lisp_Vectorlike
:
5387 if (VECTOR_MARKED_P (XVECTOR (obj
)))
5389 #ifdef GC_CHECK_MARKED_OBJECTS
5391 if (m
== MEM_NIL
&& !SUBRP (obj
)
5392 && po
!= &buffer_defaults
5393 && po
!= &buffer_local_symbols
)
5395 #endif /* GC_CHECK_MARKED_OBJECTS */
5399 #ifdef GC_CHECK_MARKED_OBJECTS
5400 if (po
!= &buffer_defaults
&& po
!= &buffer_local_symbols
)
5403 for (b
= all_buffers
; b
&& b
!= po
; b
= b
->header
.next
.buffer
)
5408 #endif /* GC_CHECK_MARKED_OBJECTS */
5411 else if (SUBRP (obj
))
5413 else if (COMPILEDP (obj
))
5414 /* We could treat this just like a vector, but it is better to
5415 save the COMPILED_CONSTANTS element for last and avoid
5418 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
5419 register EMACS_UINT size
= ptr
->header
.size
;
5420 register EMACS_UINT i
;
5422 CHECK_LIVE (live_vector_p
);
5423 VECTOR_MARK (ptr
); /* Else mark it */
5424 size
&= PSEUDOVECTOR_SIZE_MASK
;
5425 for (i
= 0; i
< size
; i
++) /* and then mark its elements */
5427 if (i
!= COMPILED_CONSTANTS
)
5428 mark_object (ptr
->contents
[i
]);
5430 obj
= ptr
->contents
[COMPILED_CONSTANTS
];
5433 else if (FRAMEP (obj
))
5435 register struct frame
*ptr
= XFRAME (obj
);
5436 mark_vectorlike (XVECTOR (obj
));
5437 mark_face_cache (ptr
->face_cache
);
5439 else if (WINDOWP (obj
))
5441 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
5442 struct window
*w
= XWINDOW (obj
);
5443 mark_vectorlike (ptr
);
5444 /* Mark glyphs for leaf windows. Marking window matrices is
5445 sufficient because frame matrices use the same glyph
5447 if (NILP (w
->hchild
)
5449 && w
->current_matrix
)
5451 mark_glyph_matrix (w
->current_matrix
);
5452 mark_glyph_matrix (w
->desired_matrix
);
5455 else if (HASH_TABLE_P (obj
))
5457 struct Lisp_Hash_Table
*h
= XHASH_TABLE (obj
);
5458 mark_vectorlike ((struct Lisp_Vector
*)h
);
5459 /* If hash table is not weak, mark all keys and values.
5460 For weak tables, mark only the vector. */
5462 mark_object (h
->key_and_value
);
5464 VECTOR_MARK (XVECTOR (h
->key_and_value
));
5466 else if (CHAR_TABLE_P (obj
))
5467 mark_char_table (XVECTOR (obj
));
5469 mark_vectorlike (XVECTOR (obj
));
5474 register struct Lisp_Symbol
*ptr
= XSYMBOL (obj
);
5475 struct Lisp_Symbol
*ptrx
;
5479 CHECK_ALLOCATED_AND_LIVE (live_symbol_p
);
5481 mark_object (ptr
->function
);
5482 mark_object (ptr
->plist
);
5483 switch (ptr
->redirect
)
5485 case SYMBOL_PLAINVAL
: mark_object (SYMBOL_VAL (ptr
)); break;
5486 case SYMBOL_VARALIAS
:
5489 XSETSYMBOL (tem
, SYMBOL_ALIAS (ptr
));
5493 case SYMBOL_LOCALIZED
:
5495 struct Lisp_Buffer_Local_Value
*blv
= SYMBOL_BLV (ptr
);
5496 /* If the value is forwarded to a buffer or keyboard field,
5497 these are marked when we see the corresponding object.
5498 And if it's forwarded to a C variable, either it's not
5499 a Lisp_Object var, or it's staticpro'd already. */
5500 mark_object (blv
->where
);
5501 mark_object (blv
->valcell
);
5502 mark_object (blv
->defcell
);
5505 case SYMBOL_FORWARDED
:
5506 /* If the value is forwarded to a buffer or keyboard field,
5507 these are marked when we see the corresponding object.
5508 And if it's forwarded to a C variable, either it's not
5509 a Lisp_Object var, or it's staticpro'd already. */
5513 if (!PURE_POINTER_P (XSTRING (ptr
->xname
)))
5514 MARK_STRING (XSTRING (ptr
->xname
));
5515 MARK_INTERVAL_TREE (STRING_INTERVALS (ptr
->xname
));
5520 ptrx
= ptr
; /* Use of ptrx avoids compiler bug on Sun */
5521 XSETSYMBOL (obj
, ptrx
);
5528 CHECK_ALLOCATED_AND_LIVE (live_misc_p
);
5529 if (XMISCANY (obj
)->gcmarkbit
)
5531 XMISCANY (obj
)->gcmarkbit
= 1;
5533 switch (XMISCTYPE (obj
))
5536 case Lisp_Misc_Marker
:
5537 /* DO NOT mark thru the marker's chain.
5538 The buffer's markers chain does not preserve markers from gc;
5539 instead, markers are removed from the chain when freed by gc. */
5542 case Lisp_Misc_Save_Value
:
5545 register struct Lisp_Save_Value
*ptr
= XSAVE_VALUE (obj
);
5546 /* If DOGC is set, POINTER is the address of a memory
5547 area containing INTEGER potential Lisp_Objects. */
5550 Lisp_Object
*p
= (Lisp_Object
*) ptr
->pointer
;
5552 for (nelt
= ptr
->integer
; nelt
> 0; nelt
--, p
++)
5553 mark_maybe_object (*p
);
5559 case Lisp_Misc_Overlay
:
5561 struct Lisp_Overlay
*ptr
= XOVERLAY (obj
);
5562 mark_object (ptr
->start
);
5563 mark_object (ptr
->end
);
5564 mark_object (ptr
->plist
);
5567 XSETMISC (obj
, ptr
->next
);
5580 register struct Lisp_Cons
*ptr
= XCONS (obj
);
5581 if (CONS_MARKED_P (ptr
))
5583 CHECK_ALLOCATED_AND_LIVE (live_cons_p
);
5585 /* If the cdr is nil, avoid recursion for the car. */
5586 if (EQ (ptr
->u
.cdr
, Qnil
))
5592 mark_object (ptr
->car
);
5595 if (cdr_count
== mark_object_loop_halt
)
5601 CHECK_ALLOCATED_AND_LIVE (live_float_p
);
5602 FLOAT_MARK (XFLOAT (obj
));
5613 #undef CHECK_ALLOCATED
5614 #undef CHECK_ALLOCATED_AND_LIVE
5617 /* Mark the pointers in a buffer structure. */
5620 mark_buffer (Lisp_Object buf
)
5622 register struct buffer
*buffer
= XBUFFER (buf
);
5623 register Lisp_Object
*ptr
, tmp
;
5624 Lisp_Object base_buffer
;
5626 eassert (!VECTOR_MARKED_P (buffer
));
5627 VECTOR_MARK (buffer
);
5629 MARK_INTERVAL_TREE (BUF_INTERVALS (buffer
));
5631 /* For now, we just don't mark the undo_list. It's done later in
5632 a special way just before the sweep phase, and after stripping
5633 some of its elements that are not needed any more. */
5635 if (buffer
->overlays_before
)
5637 XSETMISC (tmp
, buffer
->overlays_before
);
5640 if (buffer
->overlays_after
)
5642 XSETMISC (tmp
, buffer
->overlays_after
);
5646 /* buffer-local Lisp variables start at `undo_list',
5647 tho only the ones from `name' on are GC'd normally. */
5648 for (ptr
= &buffer
->BUFFER_INTERNAL_FIELD (name
);
5649 (char *)ptr
< (char *)buffer
+ sizeof (struct buffer
);
5653 /* If this is an indirect buffer, mark its base buffer. */
5654 if (buffer
->base_buffer
&& !VECTOR_MARKED_P (buffer
->base_buffer
))
5656 XSETBUFFER (base_buffer
, buffer
->base_buffer
);
5657 mark_buffer (base_buffer
);
5661 /* Mark the Lisp pointers in the terminal objects.
5662 Called by the Fgarbage_collector. */
5665 mark_terminals (void)
5668 for (t
= terminal_list
; t
; t
= t
->next_terminal
)
5670 eassert (t
->name
!= NULL
);
5671 #ifdef HAVE_WINDOW_SYSTEM
5672 /* If a terminal object is reachable from a stacpro'ed object,
5673 it might have been marked already. Make sure the image cache
5675 mark_image_cache (t
->image_cache
);
5676 #endif /* HAVE_WINDOW_SYSTEM */
5677 if (!VECTOR_MARKED_P (t
))
5678 mark_vectorlike ((struct Lisp_Vector
*)t
);
5684 /* Value is non-zero if OBJ will survive the current GC because it's
5685 either marked or does not need to be marked to survive. */
5688 survives_gc_p (Lisp_Object obj
)
5692 switch (XTYPE (obj
))
5699 survives_p
= XSYMBOL (obj
)->gcmarkbit
;
5703 survives_p
= XMISCANY (obj
)->gcmarkbit
;
5707 survives_p
= STRING_MARKED_P (XSTRING (obj
));
5710 case Lisp_Vectorlike
:
5711 survives_p
= SUBRP (obj
) || VECTOR_MARKED_P (XVECTOR (obj
));
5715 survives_p
= CONS_MARKED_P (XCONS (obj
));
5719 survives_p
= FLOAT_MARKED_P (XFLOAT (obj
));
5726 return survives_p
|| PURE_POINTER_P ((void *) XPNTR (obj
));
5731 /* Sweep: find all structures not marked, and free them. */
5736 /* Remove or mark entries in weak hash tables.
5737 This must be done before any object is unmarked. */
5738 sweep_weak_hash_tables ();
5741 #ifdef GC_CHECK_STRING_BYTES
5742 if (!noninteractive
)
5743 check_string_bytes (1);
5746 /* Put all unmarked conses on free list */
5748 register struct cons_block
*cblk
;
5749 struct cons_block
**cprev
= &cons_block
;
5750 register int lim
= cons_block_index
;
5751 register int num_free
= 0, num_used
= 0;
5755 for (cblk
= cons_block
; cblk
; cblk
= *cprev
)
5759 int ilim
= (lim
+ BITS_PER_INT
- 1) / BITS_PER_INT
;
5761 /* Scan the mark bits an int at a time. */
5762 for (i
= 0; i
<= ilim
; i
++)
5764 if (cblk
->gcmarkbits
[i
] == -1)
5766 /* Fast path - all cons cells for this int are marked. */
5767 cblk
->gcmarkbits
[i
] = 0;
5768 num_used
+= BITS_PER_INT
;
5772 /* Some cons cells for this int are not marked.
5773 Find which ones, and free them. */
5774 int start
, pos
, stop
;
5776 start
= i
* BITS_PER_INT
;
5778 if (stop
> BITS_PER_INT
)
5779 stop
= BITS_PER_INT
;
5782 for (pos
= start
; pos
< stop
; pos
++)
5784 if (!CONS_MARKED_P (&cblk
->conses
[pos
]))
5787 cblk
->conses
[pos
].u
.chain
= cons_free_list
;
5788 cons_free_list
= &cblk
->conses
[pos
];
5790 cons_free_list
->car
= Vdead
;
5796 CONS_UNMARK (&cblk
->conses
[pos
]);
5802 lim
= CONS_BLOCK_SIZE
;
5803 /* If this block contains only free conses and we have already
5804 seen more than two blocks worth of free conses then deallocate
5806 if (this_free
== CONS_BLOCK_SIZE
&& num_free
> CONS_BLOCK_SIZE
)
5808 *cprev
= cblk
->next
;
5809 /* Unhook from the free list. */
5810 cons_free_list
= cblk
->conses
[0].u
.chain
;
5811 lisp_align_free (cblk
);
5816 num_free
+= this_free
;
5817 cprev
= &cblk
->next
;
5820 total_conses
= num_used
;
5821 total_free_conses
= num_free
;
5824 /* Put all unmarked floats on free list */
5826 register struct float_block
*fblk
;
5827 struct float_block
**fprev
= &float_block
;
5828 register int lim
= float_block_index
;
5829 register int num_free
= 0, num_used
= 0;
5831 float_free_list
= 0;
5833 for (fblk
= float_block
; fblk
; fblk
= *fprev
)
5837 for (i
= 0; i
< lim
; i
++)
5838 if (!FLOAT_MARKED_P (&fblk
->floats
[i
]))
5841 fblk
->floats
[i
].u
.chain
= float_free_list
;
5842 float_free_list
= &fblk
->floats
[i
];
5847 FLOAT_UNMARK (&fblk
->floats
[i
]);
5849 lim
= FLOAT_BLOCK_SIZE
;
5850 /* If this block contains only free floats and we have already
5851 seen more than two blocks worth of free floats then deallocate
5853 if (this_free
== FLOAT_BLOCK_SIZE
&& num_free
> FLOAT_BLOCK_SIZE
)
5855 *fprev
= fblk
->next
;
5856 /* Unhook from the free list. */
5857 float_free_list
= fblk
->floats
[0].u
.chain
;
5858 lisp_align_free (fblk
);
5863 num_free
+= this_free
;
5864 fprev
= &fblk
->next
;
5867 total_floats
= num_used
;
5868 total_free_floats
= num_free
;
5871 /* Put all unmarked intervals on free list */
5873 register struct interval_block
*iblk
;
5874 struct interval_block
**iprev
= &interval_block
;
5875 register int lim
= interval_block_index
;
5876 register int num_free
= 0, num_used
= 0;
5878 interval_free_list
= 0;
5880 for (iblk
= interval_block
; iblk
; iblk
= *iprev
)
5885 for (i
= 0; i
< lim
; i
++)
5887 if (!iblk
->intervals
[i
].gcmarkbit
)
5889 SET_INTERVAL_PARENT (&iblk
->intervals
[i
], interval_free_list
);
5890 interval_free_list
= &iblk
->intervals
[i
];
5896 iblk
->intervals
[i
].gcmarkbit
= 0;
5899 lim
= INTERVAL_BLOCK_SIZE
;
5900 /* If this block contains only free intervals and we have already
5901 seen more than two blocks worth of free intervals then
5902 deallocate this block. */
5903 if (this_free
== INTERVAL_BLOCK_SIZE
&& num_free
> INTERVAL_BLOCK_SIZE
)
5905 *iprev
= iblk
->next
;
5906 /* Unhook from the free list. */
5907 interval_free_list
= INTERVAL_PARENT (&iblk
->intervals
[0]);
5909 n_interval_blocks
--;
5913 num_free
+= this_free
;
5914 iprev
= &iblk
->next
;
5917 total_intervals
= num_used
;
5918 total_free_intervals
= num_free
;
5921 /* Put all unmarked symbols on free list */
5923 register struct symbol_block
*sblk
;
5924 struct symbol_block
**sprev
= &symbol_block
;
5925 register int lim
= symbol_block_index
;
5926 register int num_free
= 0, num_used
= 0;
5928 symbol_free_list
= NULL
;
5930 for (sblk
= symbol_block
; sblk
; sblk
= *sprev
)
5933 struct Lisp_Symbol
*sym
= sblk
->symbols
;
5934 struct Lisp_Symbol
*end
= sym
+ lim
;
5936 for (; sym
< end
; ++sym
)
5938 /* Check if the symbol was created during loadup. In such a case
5939 it might be pointed to by pure bytecode which we don't trace,
5940 so we conservatively assume that it is live. */
5941 int pure_p
= PURE_POINTER_P (XSTRING (sym
->xname
));
5943 if (!sym
->gcmarkbit
&& !pure_p
)
5945 if (sym
->redirect
== SYMBOL_LOCALIZED
)
5946 xfree (SYMBOL_BLV (sym
));
5947 sym
->next
= symbol_free_list
;
5948 symbol_free_list
= sym
;
5950 symbol_free_list
->function
= Vdead
;
5958 UNMARK_STRING (XSTRING (sym
->xname
));
5963 lim
= SYMBOL_BLOCK_SIZE
;
5964 /* If this block contains only free symbols and we have already
5965 seen more than two blocks worth of free symbols then deallocate
5967 if (this_free
== SYMBOL_BLOCK_SIZE
&& num_free
> SYMBOL_BLOCK_SIZE
)
5969 *sprev
= sblk
->next
;
5970 /* Unhook from the free list. */
5971 symbol_free_list
= sblk
->symbols
[0].next
;
5977 num_free
+= this_free
;
5978 sprev
= &sblk
->next
;
5981 total_symbols
= num_used
;
5982 total_free_symbols
= num_free
;
5985 /* Put all unmarked misc's on free list.
5986 For a marker, first unchain it from the buffer it points into. */
5988 register struct marker_block
*mblk
;
5989 struct marker_block
**mprev
= &marker_block
;
5990 register int lim
= marker_block_index
;
5991 register int num_free
= 0, num_used
= 0;
5993 marker_free_list
= 0;
5995 for (mblk
= marker_block
; mblk
; mblk
= *mprev
)
6000 for (i
= 0; i
< lim
; i
++)
6002 if (!mblk
->markers
[i
].u_any
.gcmarkbit
)
6004 if (mblk
->markers
[i
].u_any
.type
== Lisp_Misc_Marker
)
6005 unchain_marker (&mblk
->markers
[i
].u_marker
);
6006 /* Set the type of the freed object to Lisp_Misc_Free.
6007 We could leave the type alone, since nobody checks it,
6008 but this might catch bugs faster. */
6009 mblk
->markers
[i
].u_marker
.type
= Lisp_Misc_Free
;
6010 mblk
->markers
[i
].u_free
.chain
= marker_free_list
;
6011 marker_free_list
= &mblk
->markers
[i
];
6017 mblk
->markers
[i
].u_any
.gcmarkbit
= 0;
6020 lim
= MARKER_BLOCK_SIZE
;
6021 /* If this block contains only free markers and we have already
6022 seen more than two blocks worth of free markers then deallocate
6024 if (this_free
== MARKER_BLOCK_SIZE
&& num_free
> MARKER_BLOCK_SIZE
)
6026 *mprev
= mblk
->next
;
6027 /* Unhook from the free list. */
6028 marker_free_list
= mblk
->markers
[0].u_free
.chain
;
6034 num_free
+= this_free
;
6035 mprev
= &mblk
->next
;
6039 total_markers
= num_used
;
6040 total_free_markers
= num_free
;
6043 /* Free all unmarked buffers */
6045 register struct buffer
*buffer
= all_buffers
, *prev
= 0, *next
;
6048 if (!VECTOR_MARKED_P (buffer
))
6051 prev
->header
.next
= buffer
->header
.next
;
6053 all_buffers
= buffer
->header
.next
.buffer
;
6054 next
= buffer
->header
.next
.buffer
;
6060 VECTOR_UNMARK (buffer
);
6061 UNMARK_BALANCE_INTERVALS (BUF_INTERVALS (buffer
));
6062 prev
= buffer
, buffer
= buffer
->header
.next
.buffer
;
6066 /* Free all unmarked vectors */
6068 register struct Lisp_Vector
*vector
= all_vectors
, *prev
= 0, *next
;
6069 total_vector_size
= 0;
6072 if (!VECTOR_MARKED_P (vector
))
6075 prev
->header
.next
= vector
->header
.next
;
6077 all_vectors
= vector
->header
.next
.vector
;
6078 next
= vector
->header
.next
.vector
;
6086 VECTOR_UNMARK (vector
);
6087 if (vector
->header
.size
& PSEUDOVECTOR_FLAG
)
6088 total_vector_size
+= PSEUDOVECTOR_SIZE_MASK
& vector
->header
.size
;
6090 total_vector_size
+= vector
->header
.size
;
6091 prev
= vector
, vector
= vector
->header
.next
.vector
;
6095 #ifdef GC_CHECK_STRING_BYTES
6096 if (!noninteractive
)
6097 check_string_bytes (1);
6104 /* Debugging aids. */
6106 DEFUN ("memory-limit", Fmemory_limit
, Smemory_limit
, 0, 0, 0,
6107 doc
: /* Return the address of the last byte Emacs has allocated, divided by 1024.
6108 This may be helpful in debugging Emacs's memory usage.
6109 We divide the value by 1024 to make sure it fits in a Lisp integer. */)
6114 XSETINT (end
, (intptr_t) (char *) sbrk (0) / 1024);
6119 DEFUN ("memory-use-counts", Fmemory_use_counts
, Smemory_use_counts
, 0, 0, 0,
6120 doc
: /* Return a list of counters that measure how much consing there has been.
6121 Each of these counters increments for a certain kind of object.
6122 The counters wrap around from the largest positive integer to zero.
6123 Garbage collection does not decrease them.
6124 The elements of the value are as follows:
6125 (CONSES FLOATS VECTOR-CELLS SYMBOLS STRING-CHARS MISCS INTERVALS STRINGS)
6126 All are in units of 1 = one object consed
6127 except for VECTOR-CELLS and STRING-CHARS, which count the total length of
6129 MISCS include overlays, markers, and some internal types.
6130 Frames, windows, buffers, and subprocesses count as vectors
6131 (but the contents of a buffer's text do not count here). */)
6134 Lisp_Object consed
[8];
6136 consed
[0] = make_number (min (MOST_POSITIVE_FIXNUM
, cons_cells_consed
));
6137 consed
[1] = make_number (min (MOST_POSITIVE_FIXNUM
, floats_consed
));
6138 consed
[2] = make_number (min (MOST_POSITIVE_FIXNUM
, vector_cells_consed
));
6139 consed
[3] = make_number (min (MOST_POSITIVE_FIXNUM
, symbols_consed
));
6140 consed
[4] = make_number (min (MOST_POSITIVE_FIXNUM
, string_chars_consed
));
6141 consed
[5] = make_number (min (MOST_POSITIVE_FIXNUM
, misc_objects_consed
));
6142 consed
[6] = make_number (min (MOST_POSITIVE_FIXNUM
, intervals_consed
));
6143 consed
[7] = make_number (min (MOST_POSITIVE_FIXNUM
, strings_consed
));
6145 return Flist (8, consed
);
6148 #ifdef ENABLE_CHECKING
6149 int suppress_checking
;
6152 die (const char *msg
, const char *file
, int line
)
6154 fprintf (stderr
, "\r\n%s:%d: Emacs fatal error: %s\r\n",
6160 /* Initialization */
6163 init_alloc_once (void)
6165 /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */
6167 pure_size
= PURESIZE
;
6168 pure_bytes_used
= 0;
6169 pure_bytes_used_lisp
= pure_bytes_used_non_lisp
= 0;
6170 pure_bytes_used_before_overflow
= 0;
6172 /* Initialize the list of free aligned blocks. */
6175 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
6177 Vdead
= make_pure_string ("DEAD", 4, 4, 0);
6181 ignore_warnings
= 1;
6182 #ifdef DOUG_LEA_MALLOC
6183 mallopt (M_TRIM_THRESHOLD
, 128*1024); /* trim threshold */
6184 mallopt (M_MMAP_THRESHOLD
, 64*1024); /* mmap threshold */
6185 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
); /* max. number of mmap'ed areas */
6193 init_weak_hash_tables ();
6196 malloc_hysteresis
= 32;
6198 malloc_hysteresis
= 0;
6201 refill_memory_reserve ();
6203 ignore_warnings
= 0;
6205 byte_stack_list
= 0;
6207 consing_since_gc
= 0;
6208 gc_cons_threshold
= 100000 * sizeof (Lisp_Object
);
6209 gc_relative_threshold
= 0;
6216 byte_stack_list
= 0;
6218 #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS
6219 setjmp_tested_p
= longjmps_done
= 0;
6222 Vgc_elapsed
= make_float (0.0);
6227 syms_of_alloc (void)
6229 DEFVAR_INT ("gc-cons-threshold", gc_cons_threshold
,
6230 doc
: /* *Number of bytes of consing between garbage collections.
6231 Garbage collection can happen automatically once this many bytes have been
6232 allocated since the last garbage collection. All data types count.
6234 Garbage collection happens automatically only when `eval' is called.
6236 By binding this temporarily to a large number, you can effectively
6237 prevent garbage collection during a part of the program.
6238 See also `gc-cons-percentage'. */);
6240 DEFVAR_LISP ("gc-cons-percentage", Vgc_cons_percentage
,
6241 doc
: /* *Portion of the heap used for allocation.
6242 Garbage collection can happen automatically once this portion of the heap
6243 has been allocated since the last garbage collection.
6244 If this portion is smaller than `gc-cons-threshold', this is ignored. */);
6245 Vgc_cons_percentage
= make_float (0.1);
6247 DEFVAR_INT ("pure-bytes-used", pure_bytes_used
,
6248 doc
: /* Number of bytes of sharable Lisp data allocated so far. */);
6250 DEFVAR_INT ("cons-cells-consed", cons_cells_consed
,
6251 doc
: /* Number of cons cells that have been consed so far. */);
6253 DEFVAR_INT ("floats-consed", floats_consed
,
6254 doc
: /* Number of floats that have been consed so far. */);
6256 DEFVAR_INT ("vector-cells-consed", vector_cells_consed
,
6257 doc
: /* Number of vector cells that have been consed so far. */);
6259 DEFVAR_INT ("symbols-consed", symbols_consed
,
6260 doc
: /* Number of symbols that have been consed so far. */);
6262 DEFVAR_INT ("string-chars-consed", string_chars_consed
,
6263 doc
: /* Number of string characters that have been consed so far. */);
6265 DEFVAR_INT ("misc-objects-consed", misc_objects_consed
,
6266 doc
: /* Number of miscellaneous objects that have been consed so far. */);
6268 DEFVAR_INT ("intervals-consed", intervals_consed
,
6269 doc
: /* Number of intervals that have been consed so far. */);
6271 DEFVAR_INT ("strings-consed", strings_consed
,
6272 doc
: /* Number of strings that have been consed so far. */);
6274 DEFVAR_LISP ("purify-flag", Vpurify_flag
,
6275 doc
: /* Non-nil means loading Lisp code in order to dump an executable.
6276 This means that certain objects should be allocated in shared (pure) space.
6277 It can also be set to a hash-table, in which case this table is used to
6278 do hash-consing of the objects allocated to pure space. */);
6280 DEFVAR_BOOL ("garbage-collection-messages", garbage_collection_messages
,
6281 doc
: /* Non-nil means display messages at start and end of garbage collection. */);
6282 garbage_collection_messages
= 0;
6284 DEFVAR_LISP ("post-gc-hook", Vpost_gc_hook
,
6285 doc
: /* Hook run after garbage collection has finished. */);
6286 Vpost_gc_hook
= Qnil
;
6287 Qpost_gc_hook
= intern_c_string ("post-gc-hook");
6288 staticpro (&Qpost_gc_hook
);
6290 DEFVAR_LISP ("memory-signal-data", Vmemory_signal_data
,
6291 doc
: /* Precomputed `signal' argument for memory-full error. */);
6292 /* We build this in advance because if we wait until we need it, we might
6293 not be able to allocate the memory to hold it. */
6295 = pure_cons (Qerror
,
6296 pure_cons (make_pure_c_string ("Memory exhausted--use M-x save-some-buffers then exit and restart Emacs"), Qnil
));
6298 DEFVAR_LISP ("memory-full", Vmemory_full
,
6299 doc
: /* Non-nil means Emacs cannot get much more Lisp memory. */);
6300 Vmemory_full
= Qnil
;
6302 staticpro (&Qgc_cons_threshold
);
6303 Qgc_cons_threshold
= intern_c_string ("gc-cons-threshold");
6305 staticpro (&Qchar_table_extra_slots
);
6306 Qchar_table_extra_slots
= intern_c_string ("char-table-extra-slots");
6308 DEFVAR_LISP ("gc-elapsed", Vgc_elapsed
,
6309 doc
: /* Accumulated time elapsed in garbage collections.
6310 The time is in seconds as a floating point value. */);
6311 DEFVAR_INT ("gcs-done", gcs_done
,
6312 doc
: /* Accumulated number of garbage collections done. */);
6317 defsubr (&Smake_byte_code
);
6318 defsubr (&Smake_list
);
6319 defsubr (&Smake_vector
);
6320 defsubr (&Smake_string
);
6321 defsubr (&Smake_bool_vector
);
6322 defsubr (&Smake_symbol
);
6323 defsubr (&Smake_marker
);
6324 defsubr (&Spurecopy
);
6325 defsubr (&Sgarbage_collect
);
6326 defsubr (&Smemory_limit
);
6327 defsubr (&Smemory_use_counts
);
6329 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
6330 defsubr (&Sgc_status
);