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. */
31 #ifdef HAVE_GTK_AND_PTHREAD
35 /* This file is part of the core Lisp implementation, and thus must
36 deal with the real data structures. If the Lisp implementation is
37 replaced, this file likely will not be used. */
39 #undef HIDE_LISP_IMPLEMENTATION
42 #include "intervals.h"
48 #include "blockinput.h"
49 #include "character.h"
50 #include "syssignal.h"
51 #include "termhooks.h" /* For struct terminal. */
54 /* GC_MALLOC_CHECK defined means perform validity checks of malloc'd
55 memory. Can do this only if using gmalloc.c. */
57 #if defined SYSTEM_MALLOC || defined DOUG_LEA_MALLOC
58 #undef GC_MALLOC_CHECK
63 extern POINTER_TYPE
*sbrk ();
72 #ifdef DOUG_LEA_MALLOC
75 /* malloc.h #defines this as size_t, at least in glibc2. */
76 #ifndef __malloc_size_t
77 #define __malloc_size_t int
80 /* Specify maximum number of areas to mmap. It would be nice to use a
81 value that explicitly means "no limit". */
83 #define MMAP_MAX_AREAS 100000000
85 #else /* not DOUG_LEA_MALLOC */
87 /* The following come from gmalloc.c. */
89 #define __malloc_size_t size_t
90 extern __malloc_size_t _bytes_used
;
91 extern __malloc_size_t __malloc_extra_blocks
;
93 #endif /* not DOUG_LEA_MALLOC */
95 #if ! defined SYSTEM_MALLOC && ! defined SYNC_INPUT
96 #ifdef HAVE_GTK_AND_PTHREAD
98 /* When GTK uses the file chooser dialog, different backends can be loaded
99 dynamically. One such a backend is the Gnome VFS backend that gets loaded
100 if you run Gnome. That backend creates several threads and also allocates
103 If Emacs sets malloc hooks (! SYSTEM_MALLOC) and the emacs_blocked_*
104 functions below are called from malloc, there is a chance that one
105 of these threads preempts the Emacs main thread and the hook variables
106 end up in an inconsistent state. So we have a mutex to prevent that (note
107 that the backend handles concurrent access to malloc within its own threads
108 but Emacs code running in the main thread is not included in that control).
110 When UNBLOCK_INPUT is called, reinvoke_input_signal may be called. If this
111 happens in one of the backend threads we will have two threads that tries
112 to run Emacs code at once, and the code is not prepared for that.
113 To prevent that, we only call BLOCK/UNBLOCK from the main thread. */
115 static pthread_mutex_t alloc_mutex
;
117 #define BLOCK_INPUT_ALLOC \
120 if (pthread_equal (pthread_self (), main_thread)) \
122 pthread_mutex_lock (&alloc_mutex); \
125 #define UNBLOCK_INPUT_ALLOC \
128 pthread_mutex_unlock (&alloc_mutex); \
129 if (pthread_equal (pthread_self (), main_thread)) \
134 #else /* ! defined HAVE_GTK_AND_PTHREAD */
136 #define BLOCK_INPUT_ALLOC BLOCK_INPUT
137 #define UNBLOCK_INPUT_ALLOC UNBLOCK_INPUT
139 #endif /* ! defined HAVE_GTK_AND_PTHREAD */
140 #endif /* ! defined SYSTEM_MALLOC && ! defined SYNC_INPUT */
142 /* Value of _bytes_used, when spare_memory was freed. */
144 static __malloc_size_t bytes_used_when_full
;
146 /* Mark, unmark, query mark bit of a Lisp string. S must be a pointer
147 to a struct Lisp_String. */
149 #define MARK_STRING(S) ((S)->size |= ARRAY_MARK_FLAG)
150 #define UNMARK_STRING(S) ((S)->size &= ~ARRAY_MARK_FLAG)
151 #define STRING_MARKED_P(S) (((S)->size & ARRAY_MARK_FLAG) != 0)
153 #define VECTOR_MARK(V) ((V)->size |= ARRAY_MARK_FLAG)
154 #define VECTOR_UNMARK(V) ((V)->size &= ~ARRAY_MARK_FLAG)
155 #define VECTOR_MARKED_P(V) (((V)->size & ARRAY_MARK_FLAG) != 0)
157 /* Value is the number of bytes of S, a pointer to a struct Lisp_String.
158 Be careful during GC, because S->size contains the mark bit for
161 #define GC_STRING_BYTES(S) (STRING_BYTES (S))
163 /* Global variables. */
164 struct emacs_globals globals
;
166 /* Number of bytes of consing done since the last gc. */
168 int consing_since_gc
;
170 /* Similar minimum, computed from Vgc_cons_percentage. */
172 EMACS_INT gc_relative_threshold
;
174 /* Minimum number of bytes of consing since GC before next GC,
175 when memory is full. */
177 EMACS_INT memory_full_cons_threshold
;
179 /* Nonzero during GC. */
183 /* Nonzero means abort if try to GC.
184 This is for code which is written on the assumption that
185 no GC will happen, so as to verify that assumption. */
189 /* Number of live and free conses etc. */
191 static int total_conses
, total_markers
, total_symbols
, total_vector_size
;
192 static int total_free_conses
, total_free_markers
, total_free_symbols
;
193 static int total_free_floats
, total_floats
;
195 /* Points to memory space allocated as "spare", to be freed if we run
196 out of memory. We keep one large block, four cons-blocks, and
197 two string blocks. */
199 static char *spare_memory
[7];
201 /* Amount of spare memory to keep in large reserve block. */
203 #define SPARE_MEMORY (1 << 14)
205 /* Number of extra blocks malloc should get when it needs more core. */
207 static int malloc_hysteresis
;
209 /* Initialize it to a nonzero value to force it into data space
210 (rather than bss space). That way unexec will remap it into text
211 space (pure), on some systems. We have not implemented the
212 remapping on more recent systems because this is less important
213 nowadays than in the days of small memories and timesharing. */
215 EMACS_INT pure
[(PURESIZE
+ sizeof (EMACS_INT
) - 1) / sizeof (EMACS_INT
)] = {1,};
216 #define PUREBEG (char *) pure
218 /* Pointer to the pure area, and its size. */
220 static char *purebeg
;
221 static size_t pure_size
;
223 /* Number of bytes of pure storage used before pure storage overflowed.
224 If this is non-zero, this implies that an overflow occurred. */
226 static size_t pure_bytes_used_before_overflow
;
228 /* Value is non-zero if P points into pure space. */
230 #define PURE_POINTER_P(P) \
231 (((PNTR_COMPARISON_TYPE) (P) \
232 < (PNTR_COMPARISON_TYPE) ((char *) purebeg + pure_size)) \
233 && ((PNTR_COMPARISON_TYPE) (P) \
234 >= (PNTR_COMPARISON_TYPE) purebeg))
236 /* Index in pure at which next pure Lisp object will be allocated.. */
238 static EMACS_INT pure_bytes_used_lisp
;
240 /* Number of bytes allocated for non-Lisp objects in pure storage. */
242 static EMACS_INT pure_bytes_used_non_lisp
;
244 /* If nonzero, this is a warning delivered by malloc and not yet
247 const char *pending_malloc_warning
;
249 /* Maximum amount of C stack to save when a GC happens. */
251 #ifndef MAX_SAVE_STACK
252 #define MAX_SAVE_STACK 16000
255 /* Buffer in which we save a copy of the C stack at each GC. */
257 #if MAX_SAVE_STACK > 0
258 static char *stack_copy
;
259 static size_t stack_copy_size
;
262 /* Non-zero means ignore malloc warnings. Set during initialization.
263 Currently not used. */
265 static int ignore_warnings
;
267 Lisp_Object Qgc_cons_threshold
, Qchar_table_extra_slots
;
269 /* Hook run after GC has finished. */
271 Lisp_Object Qpost_gc_hook
;
273 static void mark_buffer (Lisp_Object
);
274 static void mark_terminals (void);
275 static void gc_sweep (void);
276 static void mark_glyph_matrix (struct glyph_matrix
*);
277 static void mark_face_cache (struct face_cache
*);
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);
284 extern int message_enable_multibyte
;
286 /* When scanning the C stack for live Lisp objects, Emacs keeps track
287 of what memory allocated via lisp_malloc is intended for what
288 purpose. This enumeration specifies the type of memory. */
299 /* We used to keep separate mem_types for subtypes of vectors such as
300 process, hash_table, frame, terminal, and window, but we never made
301 use of the distinction, so it only caused source-code complexity
302 and runtime slowdown. Minor but pointless. */
306 static POINTER_TYPE
*lisp_align_malloc (size_t, enum mem_type
);
307 static POINTER_TYPE
*lisp_malloc (size_t, enum mem_type
);
310 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
312 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
313 #include <stdio.h> /* For fprintf. */
316 /* A unique object in pure space used to make some Lisp objects
317 on free lists recognizable in O(1). */
319 static Lisp_Object Vdead
;
321 #ifdef GC_MALLOC_CHECK
323 enum mem_type allocated_mem_type
;
324 static int dont_register_blocks
;
326 #endif /* GC_MALLOC_CHECK */
328 /* A node in the red-black tree describing allocated memory containing
329 Lisp data. Each such block is recorded with its start and end
330 address when it is allocated, and removed from the tree when it
333 A red-black tree is a balanced binary tree with the following
336 1. Every node is either red or black.
337 2. Every leaf is black.
338 3. If a node is red, then both of its children are black.
339 4. Every simple path from a node to a descendant leaf contains
340 the same number of black nodes.
341 5. The root is always black.
343 When nodes are inserted into the tree, or deleted from the tree,
344 the tree is "fixed" so that these properties are always true.
346 A red-black tree with N internal nodes has height at most 2
347 log(N+1). Searches, insertions and deletions are done in O(log N).
348 Please see a text book about data structures for a detailed
349 description of red-black trees. Any book worth its salt should
354 /* Children of this node. These pointers are never NULL. When there
355 is no child, the value is MEM_NIL, which points to a dummy node. */
356 struct mem_node
*left
, *right
;
358 /* The parent of this node. In the root node, this is NULL. */
359 struct mem_node
*parent
;
361 /* Start and end of allocated region. */
365 enum {MEM_BLACK
, MEM_RED
} color
;
371 /* Base address of stack. Set in main. */
373 Lisp_Object
*stack_base
;
375 /* Root of the tree describing allocated Lisp memory. */
377 static struct mem_node
*mem_root
;
379 /* Lowest and highest known address in the heap. */
381 static void *min_heap_address
, *max_heap_address
;
383 /* Sentinel node of the tree. */
385 static struct mem_node mem_z
;
386 #define MEM_NIL &mem_z
388 static struct Lisp_Vector
*allocate_vectorlike (EMACS_INT
);
389 static void lisp_free (POINTER_TYPE
*);
390 static void mark_stack (void);
391 static int live_vector_p (struct mem_node
*, void *);
392 static int live_buffer_p (struct mem_node
*, void *);
393 static int live_string_p (struct mem_node
*, void *);
394 static int live_cons_p (struct mem_node
*, void *);
395 static int live_symbol_p (struct mem_node
*, void *);
396 static int live_float_p (struct mem_node
*, void *);
397 static int live_misc_p (struct mem_node
*, void *);
398 static void mark_maybe_object (Lisp_Object
);
399 static void mark_memory (void *, void *, int);
400 static void mem_init (void);
401 static struct mem_node
*mem_insert (void *, void *, enum mem_type
);
402 static void mem_insert_fixup (struct mem_node
*);
403 static void mem_rotate_left (struct mem_node
*);
404 static void mem_rotate_right (struct mem_node
*);
405 static void mem_delete (struct mem_node
*);
406 static void mem_delete_fixup (struct mem_node
*);
407 static INLINE
struct mem_node
*mem_find (void *);
410 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
411 static void check_gcpros (void);
414 #endif /* GC_MARK_STACK || GC_MALLOC_CHECK */
416 /* Recording what needs to be marked for gc. */
418 struct gcpro
*gcprolist
;
420 /* Addresses of staticpro'd variables. Initialize it to a nonzero
421 value; otherwise some compilers put it into BSS. */
423 #define NSTATICS 0x640
424 static Lisp_Object
*staticvec
[NSTATICS
] = {&Vpurify_flag
};
426 /* Index of next unused slot in staticvec. */
428 static int staticidx
= 0;
430 static POINTER_TYPE
*pure_alloc (size_t, int);
433 /* Value is SZ rounded up to the next multiple of ALIGNMENT.
434 ALIGNMENT must be a power of 2. */
436 #define ALIGN(ptr, ALIGNMENT) \
437 ((POINTER_TYPE *) ((((EMACS_UINT)(ptr)) + (ALIGNMENT) - 1) \
438 & ~((ALIGNMENT) - 1)))
442 /************************************************************************
444 ************************************************************************/
446 /* Function malloc calls this if it finds we are near exhausting storage. */
449 malloc_warning (const char *str
)
451 pending_malloc_warning
= str
;
455 /* Display an already-pending malloc warning. */
458 display_malloc_warning (void)
460 call3 (intern ("display-warning"),
462 build_string (pending_malloc_warning
),
463 intern ("emergency"));
464 pending_malloc_warning
= 0;
468 #ifdef DOUG_LEA_MALLOC
469 # define BYTES_USED (mallinfo ().uordblks)
471 # define BYTES_USED _bytes_used
474 /* Called if we can't allocate relocatable space for a buffer. */
477 buffer_memory_full (void)
479 /* If buffers use the relocating allocator, no need to free
480 spare_memory, because we may have plenty of malloc space left
481 that we could get, and if we don't, the malloc that fails will
482 itself cause spare_memory to be freed. If buffers don't use the
483 relocating allocator, treat this like any other failing
490 /* This used to call error, but if we've run out of memory, we could
491 get infinite recursion trying to build the string. */
492 xsignal (Qnil
, Vmemory_signal_data
);
496 #ifdef XMALLOC_OVERRUN_CHECK
498 /* Check for overrun in malloc'ed buffers by wrapping a 16 byte header
499 and a 16 byte trailer around each block.
501 The header consists of 12 fixed bytes + a 4 byte integer contaning the
502 original block size, while the trailer consists of 16 fixed bytes.
504 The header is used to detect whether this block has been allocated
505 through these functions -- as it seems that some low-level libc
506 functions may bypass the malloc hooks.
510 #define XMALLOC_OVERRUN_CHECK_SIZE 16
512 static char xmalloc_overrun_check_header
[XMALLOC_OVERRUN_CHECK_SIZE
-4] =
513 { 0x9a, 0x9b, 0xae, 0xaf,
514 0xbf, 0xbe, 0xce, 0xcf,
515 0xea, 0xeb, 0xec, 0xed };
517 static char xmalloc_overrun_check_trailer
[XMALLOC_OVERRUN_CHECK_SIZE
] =
518 { 0xaa, 0xab, 0xac, 0xad,
519 0xba, 0xbb, 0xbc, 0xbd,
520 0xca, 0xcb, 0xcc, 0xcd,
521 0xda, 0xdb, 0xdc, 0xdd };
523 /* Macros to insert and extract the block size in the header. */
525 #define XMALLOC_PUT_SIZE(ptr, size) \
526 (ptr[-1] = (size & 0xff), \
527 ptr[-2] = ((size >> 8) & 0xff), \
528 ptr[-3] = ((size >> 16) & 0xff), \
529 ptr[-4] = ((size >> 24) & 0xff))
531 #define XMALLOC_GET_SIZE(ptr) \
532 (size_t)((unsigned)(ptr[-1]) | \
533 ((unsigned)(ptr[-2]) << 8) | \
534 ((unsigned)(ptr[-3]) << 16) | \
535 ((unsigned)(ptr[-4]) << 24))
538 /* The call depth in overrun_check functions. For example, this might happen:
540 overrun_check_malloc()
541 -> malloc -> (via hook)_-> emacs_blocked_malloc
542 -> overrun_check_malloc
543 call malloc (hooks are NULL, so real malloc is called).
544 malloc returns 10000.
545 add overhead, return 10016.
546 <- (back in overrun_check_malloc)
547 add overhead again, return 10032
548 xmalloc returns 10032.
553 overrun_check_free(10032)
555 free(10016) <- crash, because 10000 is the original pointer. */
557 static int check_depth
;
559 /* Like malloc, but wraps allocated block with header and trailer. */
562 overrun_check_malloc (size
)
565 register unsigned char *val
;
566 size_t overhead
= ++check_depth
== 1 ? XMALLOC_OVERRUN_CHECK_SIZE
*2 : 0;
568 val
= (unsigned char *) malloc (size
+ overhead
);
569 if (val
&& check_depth
== 1)
571 memcpy (val
, xmalloc_overrun_check_header
,
572 XMALLOC_OVERRUN_CHECK_SIZE
- 4);
573 val
+= XMALLOC_OVERRUN_CHECK_SIZE
;
574 XMALLOC_PUT_SIZE(val
, size
);
575 memcpy (val
+ size
, xmalloc_overrun_check_trailer
,
576 XMALLOC_OVERRUN_CHECK_SIZE
);
579 return (POINTER_TYPE
*)val
;
583 /* Like realloc, but checks old block for overrun, and wraps new block
584 with header and trailer. */
587 overrun_check_realloc (block
, size
)
591 register unsigned char *val
= (unsigned char *)block
;
592 size_t overhead
= ++check_depth
== 1 ? XMALLOC_OVERRUN_CHECK_SIZE
*2 : 0;
596 && memcmp (xmalloc_overrun_check_header
,
597 val
- XMALLOC_OVERRUN_CHECK_SIZE
,
598 XMALLOC_OVERRUN_CHECK_SIZE
- 4) == 0)
600 size_t osize
= XMALLOC_GET_SIZE (val
);
601 if (memcmp (xmalloc_overrun_check_trailer
, val
+ osize
,
602 XMALLOC_OVERRUN_CHECK_SIZE
))
604 memset (val
+ osize
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
605 val
-= XMALLOC_OVERRUN_CHECK_SIZE
;
606 memset (val
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
609 val
= (unsigned char *) realloc ((POINTER_TYPE
*)val
, size
+ overhead
);
611 if (val
&& check_depth
== 1)
613 memcpy (val
, xmalloc_overrun_check_header
,
614 XMALLOC_OVERRUN_CHECK_SIZE
- 4);
615 val
+= XMALLOC_OVERRUN_CHECK_SIZE
;
616 XMALLOC_PUT_SIZE(val
, size
);
617 memcpy (val
+ size
, xmalloc_overrun_check_trailer
,
618 XMALLOC_OVERRUN_CHECK_SIZE
);
621 return (POINTER_TYPE
*)val
;
624 /* Like free, but checks block for overrun. */
627 overrun_check_free (block
)
630 unsigned char *val
= (unsigned char *)block
;
635 && memcmp (xmalloc_overrun_check_header
,
636 val
- XMALLOC_OVERRUN_CHECK_SIZE
,
637 XMALLOC_OVERRUN_CHECK_SIZE
- 4) == 0)
639 size_t osize
= XMALLOC_GET_SIZE (val
);
640 if (memcmp (xmalloc_overrun_check_trailer
, val
+ osize
,
641 XMALLOC_OVERRUN_CHECK_SIZE
))
643 #ifdef XMALLOC_CLEAR_FREE_MEMORY
644 val
-= XMALLOC_OVERRUN_CHECK_SIZE
;
645 memset (val
, 0xff, osize
+ XMALLOC_OVERRUN_CHECK_SIZE
*2);
647 memset (val
+ osize
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
648 val
-= XMALLOC_OVERRUN_CHECK_SIZE
;
649 memset (val
, 0, XMALLOC_OVERRUN_CHECK_SIZE
);
660 #define malloc overrun_check_malloc
661 #define realloc overrun_check_realloc
662 #define free overrun_check_free
666 /* When using SYNC_INPUT, we don't call malloc from a signal handler, so
667 there's no need to block input around malloc. */
668 #define MALLOC_BLOCK_INPUT ((void)0)
669 #define MALLOC_UNBLOCK_INPUT ((void)0)
671 #define MALLOC_BLOCK_INPUT BLOCK_INPUT
672 #define MALLOC_UNBLOCK_INPUT UNBLOCK_INPUT
675 /* Like malloc but check for no memory and block interrupt input.. */
678 xmalloc (size_t size
)
680 register POINTER_TYPE
*val
;
683 val
= (POINTER_TYPE
*) malloc (size
);
684 MALLOC_UNBLOCK_INPUT
;
692 /* Like realloc but check for no memory and block interrupt input.. */
695 xrealloc (POINTER_TYPE
*block
, size_t size
)
697 register POINTER_TYPE
*val
;
700 /* We must call malloc explicitly when BLOCK is 0, since some
701 reallocs don't do this. */
703 val
= (POINTER_TYPE
*) malloc (size
);
705 val
= (POINTER_TYPE
*) realloc (block
, size
);
706 MALLOC_UNBLOCK_INPUT
;
708 if (!val
&& size
) memory_full ();
713 /* Like free but block interrupt input. */
716 xfree (POINTER_TYPE
*block
)
722 MALLOC_UNBLOCK_INPUT
;
723 /* We don't call refill_memory_reserve here
724 because that duplicates doing so in emacs_blocked_free
725 and the criterion should go there. */
729 /* Like strdup, but uses xmalloc. */
732 xstrdup (const char *s
)
734 size_t len
= strlen (s
) + 1;
735 char *p
= (char *) xmalloc (len
);
741 /* Unwind for SAFE_ALLOCA */
744 safe_alloca_unwind (Lisp_Object arg
)
746 register struct Lisp_Save_Value
*p
= XSAVE_VALUE (arg
);
756 /* Like malloc but used for allocating Lisp data. NBYTES is the
757 number of bytes to allocate, TYPE describes the intended use of the
758 allcated memory block (for strings, for conses, ...). */
761 static void *lisp_malloc_loser
;
764 static POINTER_TYPE
*
765 lisp_malloc (size_t nbytes
, enum mem_type type
)
771 #ifdef GC_MALLOC_CHECK
772 allocated_mem_type
= type
;
775 val
= (void *) malloc (nbytes
);
778 /* If the memory just allocated cannot be addressed thru a Lisp
779 object's pointer, and it needs to be,
780 that's equivalent to running out of memory. */
781 if (val
&& type
!= MEM_TYPE_NON_LISP
)
784 XSETCONS (tem
, (char *) val
+ nbytes
- 1);
785 if ((char *) XCONS (tem
) != (char *) val
+ nbytes
- 1)
787 lisp_malloc_loser
= val
;
794 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
795 if (val
&& type
!= MEM_TYPE_NON_LISP
)
796 mem_insert (val
, (char *) val
+ nbytes
, type
);
799 MALLOC_UNBLOCK_INPUT
;
805 /* Free BLOCK. This must be called to free memory allocated with a
806 call to lisp_malloc. */
809 lisp_free (POINTER_TYPE
*block
)
813 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
814 mem_delete (mem_find (block
));
816 MALLOC_UNBLOCK_INPUT
;
819 /* Allocation of aligned blocks of memory to store Lisp data. */
820 /* The entry point is lisp_align_malloc which returns blocks of at most */
821 /* BLOCK_BYTES and guarantees they are aligned on a BLOCK_ALIGN boundary. */
823 /* Use posix_memalloc if the system has it and we're using the system's
824 malloc (because our gmalloc.c routines don't have posix_memalign although
825 its memalloc could be used). */
826 #if defined (HAVE_POSIX_MEMALIGN) && defined (SYSTEM_MALLOC)
827 #define USE_POSIX_MEMALIGN 1
830 /* BLOCK_ALIGN has to be a power of 2. */
831 #define BLOCK_ALIGN (1 << 10)
833 /* Padding to leave at the end of a malloc'd block. This is to give
834 malloc a chance to minimize the amount of memory wasted to alignment.
835 It should be tuned to the particular malloc library used.
836 On glibc-2.3.2, malloc never tries to align, so a padding of 0 is best.
837 posix_memalign on the other hand would ideally prefer a value of 4
838 because otherwise, there's 1020 bytes wasted between each ablocks.
839 In Emacs, testing shows that those 1020 can most of the time be
840 efficiently used by malloc to place other objects, so a value of 0 can
841 still preferable unless you have a lot of aligned blocks and virtually
843 #define BLOCK_PADDING 0
844 #define BLOCK_BYTES \
845 (BLOCK_ALIGN - sizeof (struct ablock *) - BLOCK_PADDING)
847 /* Internal data structures and constants. */
849 #define ABLOCKS_SIZE 16
851 /* An aligned block of memory. */
856 char payload
[BLOCK_BYTES
];
857 struct ablock
*next_free
;
859 /* `abase' is the aligned base of the ablocks. */
860 /* It is overloaded to hold the virtual `busy' field that counts
861 the number of used ablock in the parent ablocks.
862 The first ablock has the `busy' field, the others have the `abase'
863 field. To tell the difference, we assume that pointers will have
864 integer values larger than 2 * ABLOCKS_SIZE. The lowest bit of `busy'
865 is used to tell whether the real base of the parent ablocks is `abase'
866 (if not, the word before the first ablock holds a pointer to the
868 struct ablocks
*abase
;
869 /* The padding of all but the last ablock is unused. The padding of
870 the last ablock in an ablocks is not allocated. */
872 char padding
[BLOCK_PADDING
];
876 /* A bunch of consecutive aligned blocks. */
879 struct ablock blocks
[ABLOCKS_SIZE
];
882 /* Size of the block requested from malloc or memalign. */
883 #define ABLOCKS_BYTES (sizeof (struct ablocks) - BLOCK_PADDING)
885 #define ABLOCK_ABASE(block) \
886 (((unsigned long) (block)->abase) <= (1 + 2 * ABLOCKS_SIZE) \
887 ? (struct ablocks *)(block) \
890 /* Virtual `busy' field. */
891 #define ABLOCKS_BUSY(abase) ((abase)->blocks[0].abase)
893 /* Pointer to the (not necessarily aligned) malloc block. */
894 #ifdef USE_POSIX_MEMALIGN
895 #define ABLOCKS_BASE(abase) (abase)
897 #define ABLOCKS_BASE(abase) \
898 (1 & (long) ABLOCKS_BUSY (abase) ? abase : ((void**)abase)[-1])
901 /* The list of free ablock. */
902 static struct ablock
*free_ablock
;
904 /* Allocate an aligned block of nbytes.
905 Alignment is on a multiple of BLOCK_ALIGN and `nbytes' has to be
906 smaller or equal to BLOCK_BYTES. */
907 static POINTER_TYPE
*
908 lisp_align_malloc (size_t nbytes
, enum mem_type type
)
911 struct ablocks
*abase
;
913 eassert (nbytes
<= BLOCK_BYTES
);
917 #ifdef GC_MALLOC_CHECK
918 allocated_mem_type
= type
;
924 EMACS_INT aligned
; /* int gets warning casting to 64-bit pointer. */
926 #ifdef DOUG_LEA_MALLOC
927 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
928 because mapped region contents are not preserved in
930 mallopt (M_MMAP_MAX
, 0);
933 #ifdef USE_POSIX_MEMALIGN
935 int err
= posix_memalign (&base
, BLOCK_ALIGN
, ABLOCKS_BYTES
);
941 base
= malloc (ABLOCKS_BYTES
);
942 abase
= ALIGN (base
, BLOCK_ALIGN
);
947 MALLOC_UNBLOCK_INPUT
;
951 aligned
= (base
== abase
);
953 ((void**)abase
)[-1] = base
;
955 #ifdef DOUG_LEA_MALLOC
956 /* Back to a reasonable maximum of mmap'ed areas. */
957 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
961 /* If the memory just allocated cannot be addressed thru a Lisp
962 object's pointer, and it needs to be, that's equivalent to
963 running out of memory. */
964 if (type
!= MEM_TYPE_NON_LISP
)
967 char *end
= (char *) base
+ ABLOCKS_BYTES
- 1;
969 if ((char *) XCONS (tem
) != end
)
971 lisp_malloc_loser
= base
;
973 MALLOC_UNBLOCK_INPUT
;
979 /* Initialize the blocks and put them on the free list.
980 Is `base' was not properly aligned, we can't use the last block. */
981 for (i
= 0; i
< (aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1); i
++)
983 abase
->blocks
[i
].abase
= abase
;
984 abase
->blocks
[i
].x
.next_free
= free_ablock
;
985 free_ablock
= &abase
->blocks
[i
];
987 ABLOCKS_BUSY (abase
) = (struct ablocks
*) (long) aligned
;
989 eassert (0 == ((EMACS_UINT
)abase
) % BLOCK_ALIGN
);
990 eassert (ABLOCK_ABASE (&abase
->blocks
[3]) == abase
); /* 3 is arbitrary */
991 eassert (ABLOCK_ABASE (&abase
->blocks
[0]) == abase
);
992 eassert (ABLOCKS_BASE (abase
) == base
);
993 eassert (aligned
== (long) ABLOCKS_BUSY (abase
));
996 abase
= ABLOCK_ABASE (free_ablock
);
997 ABLOCKS_BUSY (abase
) = (struct ablocks
*) (2 + (long) ABLOCKS_BUSY (abase
));
999 free_ablock
= free_ablock
->x
.next_free
;
1001 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
1002 if (val
&& type
!= MEM_TYPE_NON_LISP
)
1003 mem_insert (val
, (char *) val
+ nbytes
, type
);
1006 MALLOC_UNBLOCK_INPUT
;
1010 eassert (0 == ((EMACS_UINT
)val
) % BLOCK_ALIGN
);
1015 lisp_align_free (POINTER_TYPE
*block
)
1017 struct ablock
*ablock
= block
;
1018 struct ablocks
*abase
= ABLOCK_ABASE (ablock
);
1021 #if GC_MARK_STACK && !defined GC_MALLOC_CHECK
1022 mem_delete (mem_find (block
));
1024 /* Put on free list. */
1025 ablock
->x
.next_free
= free_ablock
;
1026 free_ablock
= ablock
;
1027 /* Update busy count. */
1028 ABLOCKS_BUSY (abase
) = (struct ablocks
*) (-2 + (long) ABLOCKS_BUSY (abase
));
1030 if (2 > (long) ABLOCKS_BUSY (abase
))
1031 { /* All the blocks are free. */
1032 int i
= 0, aligned
= (long) ABLOCKS_BUSY (abase
);
1033 struct ablock
**tem
= &free_ablock
;
1034 struct ablock
*atop
= &abase
->blocks
[aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1];
1038 if (*tem
>= (struct ablock
*) abase
&& *tem
< atop
)
1041 *tem
= (*tem
)->x
.next_free
;
1044 tem
= &(*tem
)->x
.next_free
;
1046 eassert ((aligned
& 1) == aligned
);
1047 eassert (i
== (aligned
? ABLOCKS_SIZE
: ABLOCKS_SIZE
- 1));
1048 #ifdef USE_POSIX_MEMALIGN
1049 eassert ((unsigned long)ABLOCKS_BASE (abase
) % BLOCK_ALIGN
== 0);
1051 free (ABLOCKS_BASE (abase
));
1053 MALLOC_UNBLOCK_INPUT
;
1056 /* Return a new buffer structure allocated from the heap with
1057 a call to lisp_malloc. */
1060 allocate_buffer (void)
1063 = (struct buffer
*) lisp_malloc (sizeof (struct buffer
),
1065 b
->size
= sizeof (struct buffer
) / sizeof (EMACS_INT
);
1066 XSETPVECTYPE (b
, PVEC_BUFFER
);
1071 #ifndef SYSTEM_MALLOC
1073 /* Arranging to disable input signals while we're in malloc.
1075 This only works with GNU malloc. To help out systems which can't
1076 use GNU malloc, all the calls to malloc, realloc, and free
1077 elsewhere in the code should be inside a BLOCK_INPUT/UNBLOCK_INPUT
1078 pair; unfortunately, we have no idea what C library functions
1079 might call malloc, so we can't really protect them unless you're
1080 using GNU malloc. Fortunately, most of the major operating systems
1081 can use GNU malloc. */
1084 /* When using SYNC_INPUT, we don't call malloc from a signal handler, so
1085 there's no need to block input around malloc. */
1087 #ifndef DOUG_LEA_MALLOC
1088 extern void * (*__malloc_hook
) (size_t, const void *);
1089 extern void * (*__realloc_hook
) (void *, size_t, const void *);
1090 extern void (*__free_hook
) (void *, const void *);
1091 /* Else declared in malloc.h, perhaps with an extra arg. */
1092 #endif /* DOUG_LEA_MALLOC */
1093 static void * (*old_malloc_hook
) (size_t, const void *);
1094 static void * (*old_realloc_hook
) (void *, size_t, const void*);
1095 static void (*old_free_hook
) (void*, const void*);
1097 static __malloc_size_t bytes_used_when_reconsidered
;
1099 /* This function is used as the hook for free to call. */
1102 emacs_blocked_free (void *ptr
, const void *ptr2
)
1106 #ifdef GC_MALLOC_CHECK
1112 if (m
== MEM_NIL
|| m
->start
!= ptr
)
1115 "Freeing `%p' which wasn't allocated with malloc\n", ptr
);
1120 /* fprintf (stderr, "free %p...%p (%p)\n", m->start, m->end, ptr); */
1124 #endif /* GC_MALLOC_CHECK */
1126 __free_hook
= old_free_hook
;
1129 /* If we released our reserve (due to running out of memory),
1130 and we have a fair amount free once again,
1131 try to set aside another reserve in case we run out once more. */
1132 if (! NILP (Vmemory_full
)
1133 /* Verify there is enough space that even with the malloc
1134 hysteresis this call won't run out again.
1135 The code here is correct as long as SPARE_MEMORY
1136 is substantially larger than the block size malloc uses. */
1137 && (bytes_used_when_full
1138 > ((bytes_used_when_reconsidered
= BYTES_USED
)
1139 + max (malloc_hysteresis
, 4) * SPARE_MEMORY
)))
1140 refill_memory_reserve ();
1142 __free_hook
= emacs_blocked_free
;
1143 UNBLOCK_INPUT_ALLOC
;
1147 /* This function is the malloc hook that Emacs uses. */
1150 emacs_blocked_malloc (size_t size
, const void *ptr
)
1155 __malloc_hook
= old_malloc_hook
;
1156 #ifdef DOUG_LEA_MALLOC
1157 /* Segfaults on my system. --lorentey */
1158 /* mallopt (M_TOP_PAD, malloc_hysteresis * 4096); */
1160 __malloc_extra_blocks
= malloc_hysteresis
;
1163 value
= (void *) malloc (size
);
1165 #ifdef GC_MALLOC_CHECK
1167 struct mem_node
*m
= mem_find (value
);
1170 fprintf (stderr
, "Malloc returned %p which is already in use\n",
1172 fprintf (stderr
, "Region in use is %p...%p, %u bytes, type %d\n",
1173 m
->start
, m
->end
, (char *) m
->end
- (char *) m
->start
,
1178 if (!dont_register_blocks
)
1180 mem_insert (value
, (char *) value
+ max (1, size
), allocated_mem_type
);
1181 allocated_mem_type
= MEM_TYPE_NON_LISP
;
1184 #endif /* GC_MALLOC_CHECK */
1186 __malloc_hook
= emacs_blocked_malloc
;
1187 UNBLOCK_INPUT_ALLOC
;
1189 /* fprintf (stderr, "%p malloc\n", value); */
1194 /* This function is the realloc hook that Emacs uses. */
1197 emacs_blocked_realloc (void *ptr
, size_t size
, const void *ptr2
)
1202 __realloc_hook
= old_realloc_hook
;
1204 #ifdef GC_MALLOC_CHECK
1207 struct mem_node
*m
= mem_find (ptr
);
1208 if (m
== MEM_NIL
|| m
->start
!= ptr
)
1211 "Realloc of %p which wasn't allocated with malloc\n",
1219 /* fprintf (stderr, "%p -> realloc\n", ptr); */
1221 /* Prevent malloc from registering blocks. */
1222 dont_register_blocks
= 1;
1223 #endif /* GC_MALLOC_CHECK */
1225 value
= (void *) realloc (ptr
, size
);
1227 #ifdef GC_MALLOC_CHECK
1228 dont_register_blocks
= 0;
1231 struct mem_node
*m
= mem_find (value
);
1234 fprintf (stderr
, "Realloc returns memory that is already in use\n");
1238 /* Can't handle zero size regions in the red-black tree. */
1239 mem_insert (value
, (char *) value
+ max (size
, 1), MEM_TYPE_NON_LISP
);
1242 /* fprintf (stderr, "%p <- realloc\n", value); */
1243 #endif /* GC_MALLOC_CHECK */
1245 __realloc_hook
= emacs_blocked_realloc
;
1246 UNBLOCK_INPUT_ALLOC
;
1252 #ifdef HAVE_GTK_AND_PTHREAD
1253 /* Called from Fdump_emacs so that when the dumped Emacs starts, it has a
1254 normal malloc. Some thread implementations need this as they call
1255 malloc before main. The pthread_self call in BLOCK_INPUT_ALLOC then
1256 calls malloc because it is the first call, and we have an endless loop. */
1259 reset_malloc_hooks ()
1261 __free_hook
= old_free_hook
;
1262 __malloc_hook
= old_malloc_hook
;
1263 __realloc_hook
= old_realloc_hook
;
1265 #endif /* HAVE_GTK_AND_PTHREAD */
1268 /* Called from main to set up malloc to use our hooks. */
1271 uninterrupt_malloc (void)
1273 #ifdef HAVE_GTK_AND_PTHREAD
1274 #ifdef DOUG_LEA_MALLOC
1275 pthread_mutexattr_t attr
;
1277 /* GLIBC has a faster way to do this, but lets keep it portable.
1278 This is according to the Single UNIX Specification. */
1279 pthread_mutexattr_init (&attr
);
1280 pthread_mutexattr_settype (&attr
, PTHREAD_MUTEX_RECURSIVE
);
1281 pthread_mutex_init (&alloc_mutex
, &attr
);
1282 #else /* !DOUG_LEA_MALLOC */
1283 /* Some systems such as Solaris 2.6 don't have a recursive mutex,
1284 and the bundled gmalloc.c doesn't require it. */
1285 pthread_mutex_init (&alloc_mutex
, NULL
);
1286 #endif /* !DOUG_LEA_MALLOC */
1287 #endif /* HAVE_GTK_AND_PTHREAD */
1289 if (__free_hook
!= emacs_blocked_free
)
1290 old_free_hook
= __free_hook
;
1291 __free_hook
= emacs_blocked_free
;
1293 if (__malloc_hook
!= emacs_blocked_malloc
)
1294 old_malloc_hook
= __malloc_hook
;
1295 __malloc_hook
= emacs_blocked_malloc
;
1297 if (__realloc_hook
!= emacs_blocked_realloc
)
1298 old_realloc_hook
= __realloc_hook
;
1299 __realloc_hook
= emacs_blocked_realloc
;
1302 #endif /* not SYNC_INPUT */
1303 #endif /* not SYSTEM_MALLOC */
1307 /***********************************************************************
1309 ***********************************************************************/
1311 /* Number of intervals allocated in an interval_block structure.
1312 The 1020 is 1024 minus malloc overhead. */
1314 #define INTERVAL_BLOCK_SIZE \
1315 ((1020 - sizeof (struct interval_block *)) / sizeof (struct interval))
1317 /* Intervals are allocated in chunks in form of an interval_block
1320 struct interval_block
1322 /* Place `intervals' first, to preserve alignment. */
1323 struct interval intervals
[INTERVAL_BLOCK_SIZE
];
1324 struct interval_block
*next
;
1327 /* Current interval block. Its `next' pointer points to older
1330 static struct interval_block
*interval_block
;
1332 /* Index in interval_block above of the next unused interval
1335 static int interval_block_index
;
1337 /* Number of free and live intervals. */
1339 static int total_free_intervals
, total_intervals
;
1341 /* List of free intervals. */
1343 INTERVAL interval_free_list
;
1345 /* Total number of interval blocks now in use. */
1347 static int n_interval_blocks
;
1350 /* Initialize interval allocation. */
1353 init_intervals (void)
1355 interval_block
= NULL
;
1356 interval_block_index
= INTERVAL_BLOCK_SIZE
;
1357 interval_free_list
= 0;
1358 n_interval_blocks
= 0;
1362 /* Return a new interval. */
1365 make_interval (void)
1369 /* eassert (!handling_signal); */
1373 if (interval_free_list
)
1375 val
= interval_free_list
;
1376 interval_free_list
= INTERVAL_PARENT (interval_free_list
);
1380 if (interval_block_index
== INTERVAL_BLOCK_SIZE
)
1382 register struct interval_block
*newi
;
1384 newi
= (struct interval_block
*) lisp_malloc (sizeof *newi
,
1387 newi
->next
= interval_block
;
1388 interval_block
= newi
;
1389 interval_block_index
= 0;
1390 n_interval_blocks
++;
1392 val
= &interval_block
->intervals
[interval_block_index
++];
1395 MALLOC_UNBLOCK_INPUT
;
1397 consing_since_gc
+= sizeof (struct interval
);
1399 RESET_INTERVAL (val
);
1405 /* Mark Lisp objects in interval I. */
1408 mark_interval (register INTERVAL i
, Lisp_Object dummy
)
1410 eassert (!i
->gcmarkbit
); /* Intervals are never shared. */
1412 mark_object (i
->plist
);
1416 /* Mark the interval tree rooted in TREE. Don't call this directly;
1417 use the macro MARK_INTERVAL_TREE instead. */
1420 mark_interval_tree (register INTERVAL tree
)
1422 /* No need to test if this tree has been marked already; this
1423 function is always called through the MARK_INTERVAL_TREE macro,
1424 which takes care of that. */
1426 traverse_intervals_noorder (tree
, mark_interval
, Qnil
);
1430 /* Mark the interval tree rooted in I. */
1432 #define MARK_INTERVAL_TREE(i) \
1434 if (!NULL_INTERVAL_P (i) && !i->gcmarkbit) \
1435 mark_interval_tree (i); \
1439 #define UNMARK_BALANCE_INTERVALS(i) \
1441 if (! NULL_INTERVAL_P (i)) \
1442 (i) = balance_intervals (i); \
1446 /* Number support. If USE_LISP_UNION_TYPE is in effect, we
1447 can't create number objects in macros. */
1450 make_number (EMACS_INT n
)
1454 obj
.s
.type
= Lisp_Int
;
1459 /***********************************************************************
1461 ***********************************************************************/
1463 /* Lisp_Strings are allocated in string_block structures. When a new
1464 string_block is allocated, all the Lisp_Strings it contains are
1465 added to a free-list string_free_list. When a new Lisp_String is
1466 needed, it is taken from that list. During the sweep phase of GC,
1467 string_blocks that are entirely free are freed, except two which
1470 String data is allocated from sblock structures. Strings larger
1471 than LARGE_STRING_BYTES, get their own sblock, data for smaller
1472 strings is sub-allocated out of sblocks of size SBLOCK_SIZE.
1474 Sblocks consist internally of sdata structures, one for each
1475 Lisp_String. The sdata structure points to the Lisp_String it
1476 belongs to. The Lisp_String points back to the `u.data' member of
1477 its sdata structure.
1479 When a Lisp_String is freed during GC, it is put back on
1480 string_free_list, and its `data' member and its sdata's `string'
1481 pointer is set to null. The size of the string is recorded in the
1482 `u.nbytes' member of the sdata. So, sdata structures that are no
1483 longer used, can be easily recognized, and it's easy to compact the
1484 sblocks of small strings which we do in compact_small_strings. */
1486 /* Size in bytes of an sblock structure used for small strings. This
1487 is 8192 minus malloc overhead. */
1489 #define SBLOCK_SIZE 8188
1491 /* Strings larger than this are considered large strings. String data
1492 for large strings is allocated from individual sblocks. */
1494 #define LARGE_STRING_BYTES 1024
1496 /* Structure describing string memory sub-allocated from an sblock.
1497 This is where the contents of Lisp strings are stored. */
1501 /* Back-pointer to the string this sdata belongs to. If null, this
1502 structure is free, and the NBYTES member of the union below
1503 contains the string's byte size (the same value that STRING_BYTES
1504 would return if STRING were non-null). If non-null, STRING_BYTES
1505 (STRING) is the size of the data, and DATA contains the string's
1507 struct Lisp_String
*string
;
1509 #ifdef GC_CHECK_STRING_BYTES
1512 unsigned char data
[1];
1514 #define SDATA_NBYTES(S) (S)->nbytes
1515 #define SDATA_DATA(S) (S)->data
1517 #else /* not GC_CHECK_STRING_BYTES */
1521 /* When STRING in non-null. */
1522 unsigned char data
[1];
1524 /* When STRING is null. */
1529 #define SDATA_NBYTES(S) (S)->u.nbytes
1530 #define SDATA_DATA(S) (S)->u.data
1532 #endif /* not GC_CHECK_STRING_BYTES */
1536 /* Structure describing a block of memory which is sub-allocated to
1537 obtain string data memory for strings. Blocks for small strings
1538 are of fixed size SBLOCK_SIZE. Blocks for large strings are made
1539 as large as needed. */
1544 struct sblock
*next
;
1546 /* Pointer to the next free sdata block. This points past the end
1547 of the sblock if there isn't any space left in this block. */
1548 struct sdata
*next_free
;
1550 /* Start of data. */
1551 struct sdata first_data
;
1554 /* Number of Lisp strings in a string_block structure. The 1020 is
1555 1024 minus malloc overhead. */
1557 #define STRING_BLOCK_SIZE \
1558 ((1020 - sizeof (struct string_block *)) / sizeof (struct Lisp_String))
1560 /* Structure describing a block from which Lisp_String structures
1565 /* Place `strings' first, to preserve alignment. */
1566 struct Lisp_String strings
[STRING_BLOCK_SIZE
];
1567 struct string_block
*next
;
1570 /* Head and tail of the list of sblock structures holding Lisp string
1571 data. We always allocate from current_sblock. The NEXT pointers
1572 in the sblock structures go from oldest_sblock to current_sblock. */
1574 static struct sblock
*oldest_sblock
, *current_sblock
;
1576 /* List of sblocks for large strings. */
1578 static struct sblock
*large_sblocks
;
1580 /* List of string_block structures, and how many there are. */
1582 static struct string_block
*string_blocks
;
1583 static int n_string_blocks
;
1585 /* Free-list of Lisp_Strings. */
1587 static struct Lisp_String
*string_free_list
;
1589 /* Number of live and free Lisp_Strings. */
1591 static int total_strings
, total_free_strings
;
1593 /* Number of bytes used by live strings. */
1595 static EMACS_INT total_string_size
;
1597 /* Given a pointer to a Lisp_String S which is on the free-list
1598 string_free_list, return a pointer to its successor in the
1601 #define NEXT_FREE_LISP_STRING(S) (*(struct Lisp_String **) (S))
1603 /* Return a pointer to the sdata structure belonging to Lisp string S.
1604 S must be live, i.e. S->data must not be null. S->data is actually
1605 a pointer to the `u.data' member of its sdata structure; the
1606 structure starts at a constant offset in front of that. */
1608 #ifdef GC_CHECK_STRING_BYTES
1610 #define SDATA_OF_STRING(S) \
1611 ((struct sdata *) ((S)->data - sizeof (struct Lisp_String *) \
1612 - sizeof (EMACS_INT)))
1614 #else /* not GC_CHECK_STRING_BYTES */
1616 #define SDATA_OF_STRING(S) \
1617 ((struct sdata *) ((S)->data - sizeof (struct Lisp_String *)))
1619 #endif /* not GC_CHECK_STRING_BYTES */
1622 #ifdef GC_CHECK_STRING_OVERRUN
1624 /* We check for overrun in string data blocks by appending a small
1625 "cookie" after each allocated string data block, and check for the
1626 presence of this cookie during GC. */
1628 #define GC_STRING_OVERRUN_COOKIE_SIZE 4
1629 static char string_overrun_cookie
[GC_STRING_OVERRUN_COOKIE_SIZE
] =
1630 { 0xde, 0xad, 0xbe, 0xef };
1633 #define GC_STRING_OVERRUN_COOKIE_SIZE 0
1636 /* Value is the size of an sdata structure large enough to hold NBYTES
1637 bytes of string data. The value returned includes a terminating
1638 NUL byte, the size of the sdata structure, and padding. */
1640 #ifdef GC_CHECK_STRING_BYTES
1642 #define SDATA_SIZE(NBYTES) \
1643 ((sizeof (struct Lisp_String *) \
1645 + sizeof (EMACS_INT) \
1646 + sizeof (EMACS_INT) - 1) \
1647 & ~(sizeof (EMACS_INT) - 1))
1649 #else /* not GC_CHECK_STRING_BYTES */
1651 #define SDATA_SIZE(NBYTES) \
1652 ((sizeof (struct Lisp_String *) \
1654 + sizeof (EMACS_INT) - 1) \
1655 & ~(sizeof (EMACS_INT) - 1))
1657 #endif /* not GC_CHECK_STRING_BYTES */
1659 /* Extra bytes to allocate for each string. */
1661 #define GC_STRING_EXTRA (GC_STRING_OVERRUN_COOKIE_SIZE)
1663 /* Initialize string allocation. Called from init_alloc_once. */
1668 total_strings
= total_free_strings
= total_string_size
= 0;
1669 oldest_sblock
= current_sblock
= large_sblocks
= NULL
;
1670 string_blocks
= NULL
;
1671 n_string_blocks
= 0;
1672 string_free_list
= NULL
;
1673 empty_unibyte_string
= make_pure_string ("", 0, 0, 0);
1674 empty_multibyte_string
= make_pure_string ("", 0, 0, 1);
1678 #ifdef GC_CHECK_STRING_BYTES
1680 static int check_string_bytes_count
;
1682 static void check_string_bytes (int);
1683 static void check_sblock (struct sblock
*);
1685 #define CHECK_STRING_BYTES(S) STRING_BYTES (S)
1688 /* Like GC_STRING_BYTES, but with debugging check. */
1691 string_bytes (struct Lisp_String
*s
)
1694 (s
->size_byte
< 0 ? s
->size
& ~ARRAY_MARK_FLAG
: s
->size_byte
);
1696 if (!PURE_POINTER_P (s
)
1698 && nbytes
!= SDATA_NBYTES (SDATA_OF_STRING (s
)))
1703 /* Check validity of Lisp strings' string_bytes member in B. */
1709 struct sdata
*from
, *end
, *from_end
;
1713 for (from
= &b
->first_data
; from
< end
; from
= from_end
)
1715 /* Compute the next FROM here because copying below may
1716 overwrite data we need to compute it. */
1719 /* Check that the string size recorded in the string is the
1720 same as the one recorded in the sdata structure. */
1722 CHECK_STRING_BYTES (from
->string
);
1725 nbytes
= GC_STRING_BYTES (from
->string
);
1727 nbytes
= SDATA_NBYTES (from
);
1729 nbytes
= SDATA_SIZE (nbytes
);
1730 from_end
= (struct sdata
*) ((char *) from
+ nbytes
+ GC_STRING_EXTRA
);
1735 /* Check validity of Lisp strings' string_bytes member. ALL_P
1736 non-zero means check all strings, otherwise check only most
1737 recently allocated strings. Used for hunting a bug. */
1740 check_string_bytes (all_p
)
1747 for (b
= large_sblocks
; b
; b
= b
->next
)
1749 struct Lisp_String
*s
= b
->first_data
.string
;
1751 CHECK_STRING_BYTES (s
);
1754 for (b
= oldest_sblock
; b
; b
= b
->next
)
1758 check_sblock (current_sblock
);
1761 #endif /* GC_CHECK_STRING_BYTES */
1763 #ifdef GC_CHECK_STRING_FREE_LIST
1765 /* Walk through the string free list looking for bogus next pointers.
1766 This may catch buffer overrun from a previous string. */
1769 check_string_free_list ()
1771 struct Lisp_String
*s
;
1773 /* Pop a Lisp_String off the free-list. */
1774 s
= string_free_list
;
1777 if ((unsigned long)s
< 1024)
1779 s
= NEXT_FREE_LISP_STRING (s
);
1783 #define check_string_free_list()
1786 /* Return a new Lisp_String. */
1788 static struct Lisp_String
*
1789 allocate_string (void)
1791 struct Lisp_String
*s
;
1793 /* eassert (!handling_signal); */
1797 /* If the free-list is empty, allocate a new string_block, and
1798 add all the Lisp_Strings in it to the free-list. */
1799 if (string_free_list
== NULL
)
1801 struct string_block
*b
;
1804 b
= (struct string_block
*) lisp_malloc (sizeof *b
, MEM_TYPE_STRING
);
1805 memset (b
, 0, sizeof *b
);
1806 b
->next
= string_blocks
;
1810 for (i
= STRING_BLOCK_SIZE
- 1; i
>= 0; --i
)
1813 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
1814 string_free_list
= s
;
1817 total_free_strings
+= STRING_BLOCK_SIZE
;
1820 check_string_free_list ();
1822 /* Pop a Lisp_String off the free-list. */
1823 s
= string_free_list
;
1824 string_free_list
= NEXT_FREE_LISP_STRING (s
);
1826 MALLOC_UNBLOCK_INPUT
;
1828 /* Probably not strictly necessary, but play it safe. */
1829 memset (s
, 0, sizeof *s
);
1831 --total_free_strings
;
1834 consing_since_gc
+= sizeof *s
;
1836 #ifdef GC_CHECK_STRING_BYTES
1837 if (!noninteractive
)
1839 if (++check_string_bytes_count
== 200)
1841 check_string_bytes_count
= 0;
1842 check_string_bytes (1);
1845 check_string_bytes (0);
1847 #endif /* GC_CHECK_STRING_BYTES */
1853 /* Set up Lisp_String S for holding NCHARS characters, NBYTES bytes,
1854 plus a NUL byte at the end. Allocate an sdata structure for S, and
1855 set S->data to its `u.data' member. Store a NUL byte at the end of
1856 S->data. Set S->size to NCHARS and S->size_byte to NBYTES. Free
1857 S->data if it was initially non-null. */
1860 allocate_string_data (struct Lisp_String
*s
,
1861 EMACS_INT nchars
, EMACS_INT nbytes
)
1863 struct sdata
*data
, *old_data
;
1865 EMACS_INT needed
, old_nbytes
;
1867 /* Determine the number of bytes needed to store NBYTES bytes
1869 needed
= SDATA_SIZE (nbytes
);
1870 old_data
= s
->data
? SDATA_OF_STRING (s
) : NULL
;
1871 old_nbytes
= GC_STRING_BYTES (s
);
1875 if (nbytes
> LARGE_STRING_BYTES
)
1877 size_t size
= sizeof *b
- sizeof (struct sdata
) + needed
;
1879 #ifdef DOUG_LEA_MALLOC
1880 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
1881 because mapped region contents are not preserved in
1884 In case you think of allowing it in a dumped Emacs at the
1885 cost of not being able to re-dump, there's another reason:
1886 mmap'ed data typically have an address towards the top of the
1887 address space, which won't fit into an EMACS_INT (at least on
1888 32-bit systems with the current tagging scheme). --fx */
1889 mallopt (M_MMAP_MAX
, 0);
1892 b
= (struct sblock
*) lisp_malloc (size
+ GC_STRING_EXTRA
, MEM_TYPE_NON_LISP
);
1894 #ifdef DOUG_LEA_MALLOC
1895 /* Back to a reasonable maximum of mmap'ed areas. */
1896 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
1899 b
->next_free
= &b
->first_data
;
1900 b
->first_data
.string
= NULL
;
1901 b
->next
= large_sblocks
;
1904 else if (current_sblock
== NULL
1905 || (((char *) current_sblock
+ SBLOCK_SIZE
1906 - (char *) current_sblock
->next_free
)
1907 < (needed
+ GC_STRING_EXTRA
)))
1909 /* Not enough room in the current sblock. */
1910 b
= (struct sblock
*) lisp_malloc (SBLOCK_SIZE
, MEM_TYPE_NON_LISP
);
1911 b
->next_free
= &b
->first_data
;
1912 b
->first_data
.string
= NULL
;
1916 current_sblock
->next
= b
;
1924 data
= b
->next_free
;
1925 b
->next_free
= (struct sdata
*) ((char *) data
+ needed
+ GC_STRING_EXTRA
);
1927 MALLOC_UNBLOCK_INPUT
;
1930 s
->data
= SDATA_DATA (data
);
1931 #ifdef GC_CHECK_STRING_BYTES
1932 SDATA_NBYTES (data
) = nbytes
;
1935 s
->size_byte
= nbytes
;
1936 s
->data
[nbytes
] = '\0';
1937 #ifdef GC_CHECK_STRING_OVERRUN
1938 memcpy (data
+ needed
, string_overrun_cookie
, GC_STRING_OVERRUN_COOKIE_SIZE
);
1941 /* If S had already data assigned, mark that as free by setting its
1942 string back-pointer to null, and recording the size of the data
1946 SDATA_NBYTES (old_data
) = old_nbytes
;
1947 old_data
->string
= NULL
;
1950 consing_since_gc
+= needed
;
1954 /* Sweep and compact strings. */
1957 sweep_strings (void)
1959 struct string_block
*b
, *next
;
1960 struct string_block
*live_blocks
= NULL
;
1962 string_free_list
= NULL
;
1963 total_strings
= total_free_strings
= 0;
1964 total_string_size
= 0;
1966 /* Scan strings_blocks, free Lisp_Strings that aren't marked. */
1967 for (b
= string_blocks
; b
; b
= next
)
1970 struct Lisp_String
*free_list_before
= string_free_list
;
1974 for (i
= 0; i
< STRING_BLOCK_SIZE
; ++i
)
1976 struct Lisp_String
*s
= b
->strings
+ i
;
1980 /* String was not on free-list before. */
1981 if (STRING_MARKED_P (s
))
1983 /* String is live; unmark it and its intervals. */
1986 if (!NULL_INTERVAL_P (s
->intervals
))
1987 UNMARK_BALANCE_INTERVALS (s
->intervals
);
1990 total_string_size
+= STRING_BYTES (s
);
1994 /* String is dead. Put it on the free-list. */
1995 struct sdata
*data
= SDATA_OF_STRING (s
);
1997 /* Save the size of S in its sdata so that we know
1998 how large that is. Reset the sdata's string
1999 back-pointer so that we know it's free. */
2000 #ifdef GC_CHECK_STRING_BYTES
2001 if (GC_STRING_BYTES (s
) != SDATA_NBYTES (data
))
2004 data
->u
.nbytes
= GC_STRING_BYTES (s
);
2006 data
->string
= NULL
;
2008 /* Reset the strings's `data' member so that we
2012 /* Put the string on the free-list. */
2013 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
2014 string_free_list
= s
;
2020 /* S was on the free-list before. Put it there again. */
2021 NEXT_FREE_LISP_STRING (s
) = string_free_list
;
2022 string_free_list
= s
;
2027 /* Free blocks that contain free Lisp_Strings only, except
2028 the first two of them. */
2029 if (nfree
== STRING_BLOCK_SIZE
2030 && total_free_strings
> STRING_BLOCK_SIZE
)
2034 string_free_list
= free_list_before
;
2038 total_free_strings
+= nfree
;
2039 b
->next
= live_blocks
;
2044 check_string_free_list ();
2046 string_blocks
= live_blocks
;
2047 free_large_strings ();
2048 compact_small_strings ();
2050 check_string_free_list ();
2054 /* Free dead large strings. */
2057 free_large_strings (void)
2059 struct sblock
*b
, *next
;
2060 struct sblock
*live_blocks
= NULL
;
2062 for (b
= large_sblocks
; b
; b
= next
)
2066 if (b
->first_data
.string
== NULL
)
2070 b
->next
= live_blocks
;
2075 large_sblocks
= live_blocks
;
2079 /* Compact data of small strings. Free sblocks that don't contain
2080 data of live strings after compaction. */
2083 compact_small_strings (void)
2085 struct sblock
*b
, *tb
, *next
;
2086 struct sdata
*from
, *to
, *end
, *tb_end
;
2087 struct sdata
*to_end
, *from_end
;
2089 /* TB is the sblock we copy to, TO is the sdata within TB we copy
2090 to, and TB_END is the end of TB. */
2092 tb_end
= (struct sdata
*) ((char *) tb
+ SBLOCK_SIZE
);
2093 to
= &tb
->first_data
;
2095 /* Step through the blocks from the oldest to the youngest. We
2096 expect that old blocks will stabilize over time, so that less
2097 copying will happen this way. */
2098 for (b
= oldest_sblock
; b
; b
= b
->next
)
2101 xassert ((char *) end
<= (char *) b
+ SBLOCK_SIZE
);
2103 for (from
= &b
->first_data
; from
< end
; from
= from_end
)
2105 /* Compute the next FROM here because copying below may
2106 overwrite data we need to compute it. */
2109 #ifdef GC_CHECK_STRING_BYTES
2110 /* Check that the string size recorded in the string is the
2111 same as the one recorded in the sdata structure. */
2113 && GC_STRING_BYTES (from
->string
) != SDATA_NBYTES (from
))
2115 #endif /* GC_CHECK_STRING_BYTES */
2118 nbytes
= GC_STRING_BYTES (from
->string
);
2120 nbytes
= SDATA_NBYTES (from
);
2122 if (nbytes
> LARGE_STRING_BYTES
)
2125 nbytes
= SDATA_SIZE (nbytes
);
2126 from_end
= (struct sdata
*) ((char *) from
+ nbytes
+ GC_STRING_EXTRA
);
2128 #ifdef GC_CHECK_STRING_OVERRUN
2129 if (memcmp (string_overrun_cookie
,
2130 (char *) from_end
- GC_STRING_OVERRUN_COOKIE_SIZE
,
2131 GC_STRING_OVERRUN_COOKIE_SIZE
))
2135 /* FROM->string non-null means it's alive. Copy its data. */
2138 /* If TB is full, proceed with the next sblock. */
2139 to_end
= (struct sdata
*) ((char *) to
+ nbytes
+ GC_STRING_EXTRA
);
2140 if (to_end
> tb_end
)
2144 tb_end
= (struct sdata
*) ((char *) tb
+ SBLOCK_SIZE
);
2145 to
= &tb
->first_data
;
2146 to_end
= (struct sdata
*) ((char *) to
+ nbytes
+ GC_STRING_EXTRA
);
2149 /* Copy, and update the string's `data' pointer. */
2152 xassert (tb
!= b
|| to
<= from
);
2153 memmove (to
, from
, nbytes
+ GC_STRING_EXTRA
);
2154 to
->string
->data
= SDATA_DATA (to
);
2157 /* Advance past the sdata we copied to. */
2163 /* The rest of the sblocks following TB don't contain live data, so
2164 we can free them. */
2165 for (b
= tb
->next
; b
; b
= next
)
2173 current_sblock
= tb
;
2177 DEFUE ("make-string", Fmake_string
, Smake_string
, 2, 2, 0,
2178 doc
: /* Return a newly created string of length LENGTH, with INIT in each element.
2179 LENGTH must be an integer.
2180 INIT must be an integer that represents a character. */)
2181 (Lisp_Object length
, Lisp_Object init
)
2183 register Lisp_Object val
;
2184 register unsigned char *p
, *end
;
2188 CHECK_NATNUM (length
);
2189 CHECK_NUMBER (init
);
2192 if (ASCII_CHAR_P (c
))
2194 nbytes
= XINT (length
);
2195 val
= make_uninit_string (nbytes
);
2197 end
= p
+ SCHARS (val
);
2203 unsigned char str
[MAX_MULTIBYTE_LENGTH
];
2204 int len
= CHAR_STRING (c
, str
);
2205 EMACS_INT string_len
= XINT (length
);
2207 if (string_len
> MOST_POSITIVE_FIXNUM
/ len
)
2208 error ("Maximum string size exceeded");
2209 nbytes
= len
* string_len
;
2210 val
= make_uninit_multibyte_string (string_len
, nbytes
);
2215 memcpy (p
, str
, len
);
2225 DEFUE ("make-bool-vector", Fmake_bool_vector
, Smake_bool_vector
, 2, 2, 0,
2226 doc
: /* Return a new bool-vector of length LENGTH, using INIT for each element.
2227 LENGTH must be a number. INIT matters only in whether it is t or nil. */)
2228 (Lisp_Object length
, Lisp_Object init
)
2230 register Lisp_Object val
;
2231 struct Lisp_Bool_Vector
*p
;
2233 EMACS_INT length_in_chars
, length_in_elts
;
2236 CHECK_NATNUM (length
);
2238 bits_per_value
= sizeof (EMACS_INT
) * BOOL_VECTOR_BITS_PER_CHAR
;
2240 length_in_elts
= (XFASTINT (length
) + bits_per_value
- 1) / bits_per_value
;
2241 length_in_chars
= ((XFASTINT (length
) + BOOL_VECTOR_BITS_PER_CHAR
- 1)
2242 / BOOL_VECTOR_BITS_PER_CHAR
);
2244 /* We must allocate one more elements than LENGTH_IN_ELTS for the
2245 slot `size' of the struct Lisp_Bool_Vector. */
2246 val
= Fmake_vector (make_number (length_in_elts
+ 1), Qnil
);
2248 /* Get rid of any bits that would cause confusion. */
2249 XVECTOR (val
)->size
= 0; /* No Lisp_Object to trace in there. */
2250 /* Use XVECTOR (val) rather than `p' because p->size is not TRT. */
2251 XSETPVECTYPE (XVECTOR (val
), PVEC_BOOL_VECTOR
);
2253 p
= XBOOL_VECTOR (val
);
2254 p
->size
= XFASTINT (length
);
2256 real_init
= (NILP (init
) ? 0 : -1);
2257 for (i
= 0; i
< length_in_chars
; i
++)
2258 p
->data
[i
] = real_init
;
2260 /* Clear the extraneous bits in the last byte. */
2261 if (XINT (length
) != length_in_chars
* BOOL_VECTOR_BITS_PER_CHAR
)
2262 p
->data
[length_in_chars
- 1]
2263 &= (1 << (XINT (length
) % BOOL_VECTOR_BITS_PER_CHAR
)) - 1;
2269 /* Make a string from NBYTES bytes at CONTENTS, and compute the number
2270 of characters from the contents. This string may be unibyte or
2271 multibyte, depending on the contents. */
2274 make_string (const char *contents
, EMACS_INT nbytes
)
2276 register Lisp_Object val
;
2277 EMACS_INT nchars
, multibyte_nbytes
;
2279 parse_str_as_multibyte ((const unsigned char *) contents
, nbytes
,
2280 &nchars
, &multibyte_nbytes
);
2281 if (nbytes
== nchars
|| nbytes
!= multibyte_nbytes
)
2282 /* CONTENTS contains no multibyte sequences or contains an invalid
2283 multibyte sequence. We must make unibyte string. */
2284 val
= make_unibyte_string (contents
, nbytes
);
2286 val
= make_multibyte_string (contents
, nchars
, nbytes
);
2291 /* Make an unibyte string from LENGTH bytes at CONTENTS. */
2294 make_unibyte_string (const char *contents
, EMACS_INT length
)
2296 register Lisp_Object val
;
2297 val
= make_uninit_string (length
);
2298 memcpy (SDATA (val
), contents
, length
);
2303 /* Make a multibyte string from NCHARS characters occupying NBYTES
2304 bytes at CONTENTS. */
2307 make_multibyte_string (const char *contents
,
2308 EMACS_INT nchars
, EMACS_INT nbytes
)
2310 register Lisp_Object val
;
2311 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2312 memcpy (SDATA (val
), contents
, nbytes
);
2317 /* Make a string from NCHARS characters occupying NBYTES bytes at
2318 CONTENTS. It is a multibyte string if NBYTES != NCHARS. */
2321 make_string_from_bytes (const char *contents
,
2322 EMACS_INT nchars
, EMACS_INT nbytes
)
2324 register Lisp_Object val
;
2325 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2326 memcpy (SDATA (val
), contents
, nbytes
);
2327 if (SBYTES (val
) == SCHARS (val
))
2328 STRING_SET_UNIBYTE (val
);
2333 /* Make a string from NCHARS characters occupying NBYTES bytes at
2334 CONTENTS. The argument MULTIBYTE controls whether to label the
2335 string as multibyte. If NCHARS is negative, it counts the number of
2336 characters by itself. */
2339 make_specified_string (const char *contents
,
2340 EMACS_INT nchars
, EMACS_INT nbytes
, int multibyte
)
2342 register Lisp_Object val
;
2347 nchars
= multibyte_chars_in_text ((const unsigned char *) contents
,
2352 val
= make_uninit_multibyte_string (nchars
, nbytes
);
2353 memcpy (SDATA (val
), contents
, nbytes
);
2355 STRING_SET_UNIBYTE (val
);
2360 /* Make a string from the data at STR, treating it as multibyte if the
2364 build_string (const char *str
)
2366 return make_string (str
, strlen (str
));
2370 /* Return an unibyte Lisp_String set up to hold LENGTH characters
2371 occupying LENGTH bytes. */
2374 make_uninit_string (EMACS_INT length
)
2379 return empty_unibyte_string
;
2380 val
= make_uninit_multibyte_string (length
, length
);
2381 STRING_SET_UNIBYTE (val
);
2386 /* Return a multibyte Lisp_String set up to hold NCHARS characters
2387 which occupy NBYTES bytes. */
2390 make_uninit_multibyte_string (EMACS_INT nchars
, EMACS_INT nbytes
)
2393 struct Lisp_String
*s
;
2398 return empty_multibyte_string
;
2400 s
= allocate_string ();
2401 allocate_string_data (s
, nchars
, nbytes
);
2402 XSETSTRING (string
, s
);
2403 string_chars_consed
+= nbytes
;
2409 /***********************************************************************
2411 ***********************************************************************/
2413 /* We store float cells inside of float_blocks, allocating a new
2414 float_block with malloc whenever necessary. Float cells reclaimed
2415 by GC are put on a free list to be reallocated before allocating
2416 any new float cells from the latest float_block. */
2418 #define FLOAT_BLOCK_SIZE \
2419 (((BLOCK_BYTES - sizeof (struct float_block *) \
2420 /* The compiler might add padding at the end. */ \
2421 - (sizeof (struct Lisp_Float) - sizeof (int))) * CHAR_BIT) \
2422 / (sizeof (struct Lisp_Float) * CHAR_BIT + 1))
2424 #define GETMARKBIT(block,n) \
2425 (((block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2426 >> ((n) % (sizeof(int) * CHAR_BIT))) \
2429 #define SETMARKBIT(block,n) \
2430 (block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2431 |= 1 << ((n) % (sizeof(int) * CHAR_BIT))
2433 #define UNSETMARKBIT(block,n) \
2434 (block)->gcmarkbits[(n) / (sizeof(int) * CHAR_BIT)] \
2435 &= ~(1 << ((n) % (sizeof(int) * CHAR_BIT)))
2437 #define FLOAT_BLOCK(fptr) \
2438 ((struct float_block *)(((EMACS_UINT)(fptr)) & ~(BLOCK_ALIGN - 1)))
2440 #define FLOAT_INDEX(fptr) \
2441 ((((EMACS_UINT)(fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Float))
2445 /* Place `floats' at the beginning, to ease up FLOAT_INDEX's job. */
2446 struct Lisp_Float floats
[FLOAT_BLOCK_SIZE
];
2447 int gcmarkbits
[1 + FLOAT_BLOCK_SIZE
/ (sizeof(int) * CHAR_BIT
)];
2448 struct float_block
*next
;
2451 #define FLOAT_MARKED_P(fptr) \
2452 GETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2454 #define FLOAT_MARK(fptr) \
2455 SETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2457 #define FLOAT_UNMARK(fptr) \
2458 UNSETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
2460 /* Current float_block. */
2462 struct float_block
*float_block
;
2464 /* Index of first unused Lisp_Float in the current float_block. */
2466 int float_block_index
;
2468 /* Total number of float blocks now in use. */
2472 /* Free-list of Lisp_Floats. */
2474 struct Lisp_Float
*float_free_list
;
2477 /* Initialize float allocation. */
2483 float_block_index
= FLOAT_BLOCK_SIZE
; /* Force alloc of new float_block. */
2484 float_free_list
= 0;
2489 /* Return a new float object with value FLOAT_VALUE. */
2492 make_float (double float_value
)
2494 register Lisp_Object val
;
2496 /* eassert (!handling_signal); */
2500 if (float_free_list
)
2502 /* We use the data field for chaining the free list
2503 so that we won't use the same field that has the mark bit. */
2504 XSETFLOAT (val
, float_free_list
);
2505 float_free_list
= float_free_list
->u
.chain
;
2509 if (float_block_index
== FLOAT_BLOCK_SIZE
)
2511 register struct float_block
*new;
2513 new = (struct float_block
*) lisp_align_malloc (sizeof *new,
2515 new->next
= float_block
;
2516 memset (new->gcmarkbits
, 0, sizeof new->gcmarkbits
);
2518 float_block_index
= 0;
2521 XSETFLOAT (val
, &float_block
->floats
[float_block_index
]);
2522 float_block_index
++;
2525 MALLOC_UNBLOCK_INPUT
;
2527 XFLOAT_INIT (val
, float_value
);
2528 eassert (!FLOAT_MARKED_P (XFLOAT (val
)));
2529 consing_since_gc
+= sizeof (struct Lisp_Float
);
2536 /***********************************************************************
2538 ***********************************************************************/
2540 /* We store cons cells inside of cons_blocks, allocating a new
2541 cons_block with malloc whenever necessary. Cons cells reclaimed by
2542 GC are put on a free list to be reallocated before allocating
2543 any new cons cells from the latest cons_block. */
2545 #define CONS_BLOCK_SIZE \
2546 (((BLOCK_BYTES - sizeof (struct cons_block *)) * CHAR_BIT) \
2547 / (sizeof (struct Lisp_Cons) * CHAR_BIT + 1))
2549 #define CONS_BLOCK(fptr) \
2550 ((struct cons_block *)(((EMACS_UINT)(fptr)) & ~(BLOCK_ALIGN - 1)))
2552 #define CONS_INDEX(fptr) \
2553 ((((EMACS_UINT)(fptr)) & (BLOCK_ALIGN - 1)) / sizeof (struct Lisp_Cons))
2557 /* Place `conses' at the beginning, to ease up CONS_INDEX's job. */
2558 struct Lisp_Cons conses
[CONS_BLOCK_SIZE
];
2559 int gcmarkbits
[1 + CONS_BLOCK_SIZE
/ (sizeof(int) * CHAR_BIT
)];
2560 struct cons_block
*next
;
2563 #define CONS_MARKED_P(fptr) \
2564 GETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2566 #define CONS_MARK(fptr) \
2567 SETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2569 #define CONS_UNMARK(fptr) \
2570 UNSETMARKBIT (CONS_BLOCK (fptr), CONS_INDEX ((fptr)))
2572 /* Current cons_block. */
2574 struct cons_block
*cons_block
;
2576 /* Index of first unused Lisp_Cons in the current block. */
2578 int cons_block_index
;
2580 /* Free-list of Lisp_Cons structures. */
2582 struct Lisp_Cons
*cons_free_list
;
2584 /* Total number of cons blocks now in use. */
2586 static int n_cons_blocks
;
2589 /* Initialize cons allocation. */
2595 cons_block_index
= CONS_BLOCK_SIZE
; /* Force alloc of new cons_block. */
2601 /* Explicitly free a cons cell by putting it on the free-list. */
2604 free_cons (struct Lisp_Cons
*ptr
)
2606 ptr
->u
.chain
= cons_free_list
;
2610 cons_free_list
= ptr
;
2613 DEFUE ("cons", Fcons
, Scons
, 2, 2, 0,
2614 doc
: /* Create a new cons, give it CAR and CDR as components, and return it. */)
2615 (Lisp_Object car
, Lisp_Object cdr
)
2617 register Lisp_Object val
;
2619 /* eassert (!handling_signal); */
2625 /* We use the cdr for chaining the free list
2626 so that we won't use the same field that has the mark bit. */
2627 XSETCONS (val
, cons_free_list
);
2628 cons_free_list
= cons_free_list
->u
.chain
;
2632 if (cons_block_index
== CONS_BLOCK_SIZE
)
2634 register struct cons_block
*new;
2635 new = (struct cons_block
*) lisp_align_malloc (sizeof *new,
2637 memset (new->gcmarkbits
, 0, sizeof new->gcmarkbits
);
2638 new->next
= cons_block
;
2640 cons_block_index
= 0;
2643 XSETCONS (val
, &cons_block
->conses
[cons_block_index
]);
2647 MALLOC_UNBLOCK_INPUT
;
2651 eassert (!CONS_MARKED_P (XCONS (val
)));
2652 consing_since_gc
+= sizeof (struct Lisp_Cons
);
2653 cons_cells_consed
++;
2657 #ifdef GC_CHECK_CONS_LIST
2658 /* Get an error now if there's any junk in the cons free list. */
2660 check_cons_list (void)
2662 struct Lisp_Cons
*tail
= cons_free_list
;
2665 tail
= tail
->u
.chain
;
2669 /* Make a list of 1, 2, 3, 4 or 5 specified objects. */
2672 list1 (Lisp_Object arg1
)
2674 return Fcons (arg1
, Qnil
);
2678 list2 (Lisp_Object arg1
, Lisp_Object arg2
)
2680 return Fcons (arg1
, Fcons (arg2
, Qnil
));
2685 list3 (Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
2687 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Qnil
)));
2692 list4 (Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
, Lisp_Object arg4
)
2694 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Fcons (arg4
, Qnil
))));
2699 list5 (Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
, Lisp_Object arg4
, Lisp_Object arg5
)
2701 return Fcons (arg1
, Fcons (arg2
, Fcons (arg3
, Fcons (arg4
,
2702 Fcons (arg5
, Qnil
)))));
2706 DEFUE ("list", Flist
, Slist
, 0, MANY
, 0,
2707 doc
: /* Return a newly created list with specified arguments as elements.
2708 Any number of arguments, even zero arguments, are allowed.
2709 usage: (list &rest OBJECTS) */)
2710 (size_t nargs
, register Lisp_Object
*args
)
2712 register Lisp_Object val
;
2718 val
= Fcons (args
[nargs
], val
);
2724 DEFUE ("make-list", Fmake_list
, Smake_list
, 2, 2, 0,
2725 doc
: /* Return a newly created list of length LENGTH, with each element being INIT. */)
2726 (register Lisp_Object length
, Lisp_Object init
)
2728 register Lisp_Object val
;
2729 register EMACS_INT size
;
2731 CHECK_NATNUM (length
);
2732 size
= XFASTINT (length
);
2737 val
= Fcons (init
, val
);
2742 val
= Fcons (init
, val
);
2747 val
= Fcons (init
, val
);
2752 val
= Fcons (init
, val
);
2757 val
= Fcons (init
, val
);
2772 /***********************************************************************
2774 ***********************************************************************/
2776 /* Singly-linked list of all vectors. */
2778 static struct Lisp_Vector
*all_vectors
;
2780 /* Total number of vector-like objects now in use. */
2782 static int n_vectors
;
2785 /* Value is a pointer to a newly allocated Lisp_Vector structure
2786 with room for LEN Lisp_Objects. */
2788 static struct Lisp_Vector
*
2789 allocate_vectorlike (EMACS_INT len
)
2791 struct Lisp_Vector
*p
;
2796 #ifdef DOUG_LEA_MALLOC
2797 /* Prevent mmap'ing the chunk. Lisp data may not be mmap'ed
2798 because mapped region contents are not preserved in
2800 mallopt (M_MMAP_MAX
, 0);
2803 /* This gets triggered by code which I haven't bothered to fix. --Stef */
2804 /* eassert (!handling_signal); */
2806 nbytes
= sizeof *p
+ (len
- 1) * sizeof p
->contents
[0];
2807 p
= (struct Lisp_Vector
*) lisp_malloc (nbytes
, MEM_TYPE_VECTORLIKE
);
2809 #ifdef DOUG_LEA_MALLOC
2810 /* Back to a reasonable maximum of mmap'ed areas. */
2811 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
);
2814 consing_since_gc
+= nbytes
;
2815 vector_cells_consed
+= len
;
2817 p
->next
= all_vectors
;
2820 MALLOC_UNBLOCK_INPUT
;
2827 /* Allocate a vector with NSLOTS slots. */
2829 struct Lisp_Vector
*
2830 allocate_vector (EMACS_INT nslots
)
2832 struct Lisp_Vector
*v
= allocate_vectorlike (nslots
);
2838 /* Allocate other vector-like structures. */
2840 struct Lisp_Vector
*
2841 allocate_pseudovector (int memlen
, int lisplen
, EMACS_INT tag
)
2843 struct Lisp_Vector
*v
= allocate_vectorlike (memlen
);
2846 /* Only the first lisplen slots will be traced normally by the GC. */
2848 for (i
= 0; i
< lisplen
; ++i
)
2849 v
->contents
[i
] = Qnil
;
2851 XSETPVECTYPE (v
, tag
); /* Add the appropriate tag. */
2855 struct Lisp_Hash_Table
*
2856 allocate_hash_table (void)
2858 return ALLOCATE_PSEUDOVECTOR (struct Lisp_Hash_Table
, count
, PVEC_HASH_TABLE
);
2863 allocate_window (void)
2865 return ALLOCATE_PSEUDOVECTOR(struct window
, current_matrix
, PVEC_WINDOW
);
2870 allocate_terminal (void)
2872 struct terminal
*t
= ALLOCATE_PSEUDOVECTOR (struct terminal
,
2873 next_terminal
, PVEC_TERMINAL
);
2874 /* Zero out the non-GC'd fields. FIXME: This should be made unnecessary. */
2875 memset (&t
->next_terminal
, 0,
2876 (char*) (t
+ 1) - (char*) &t
->next_terminal
);
2882 allocate_frame (void)
2884 struct frame
*f
= ALLOCATE_PSEUDOVECTOR (struct frame
,
2885 face_cache
, PVEC_FRAME
);
2886 /* Zero out the non-GC'd fields. FIXME: This should be made unnecessary. */
2887 memset (&f
->face_cache
, 0,
2888 (char *) (f
+ 1) - (char *) &f
->face_cache
);
2893 struct Lisp_Process
*
2894 allocate_process (void)
2896 return ALLOCATE_PSEUDOVECTOR (struct Lisp_Process
, pid
, PVEC_PROCESS
);
2900 DEFUE ("make-vector", Fmake_vector
, Smake_vector
, 2, 2, 0,
2901 doc
: /* Return a newly created vector of length LENGTH, with each element being INIT.
2902 See also the function `vector'. */)
2903 (register Lisp_Object length
, Lisp_Object init
)
2906 register EMACS_INT sizei
;
2907 register EMACS_INT i
;
2908 register struct Lisp_Vector
*p
;
2910 CHECK_NATNUM (length
);
2911 sizei
= XFASTINT (length
);
2913 p
= allocate_vector (sizei
);
2914 for (i
= 0; i
< sizei
; i
++)
2915 p
->contents
[i
] = init
;
2917 XSETVECTOR (vector
, p
);
2922 DEFUE ("vector", Fvector
, Svector
, 0, MANY
, 0,
2923 doc
: /* Return a newly created vector with specified arguments as elements.
2924 Any number of arguments, even zero arguments, are allowed.
2925 usage: (vector &rest OBJECTS) */)
2926 (register size_t nargs
, Lisp_Object
*args
)
2928 register Lisp_Object len
, val
;
2930 register struct Lisp_Vector
*p
;
2932 XSETFASTINT (len
, nargs
);
2933 val
= Fmake_vector (len
, Qnil
);
2935 for (i
= 0; i
< nargs
; i
++)
2936 p
->contents
[i
] = args
[i
];
2941 DEFUE ("make-byte-code", Fmake_byte_code
, Smake_byte_code
, 4, MANY
, 0,
2942 doc
: /* Create a byte-code object with specified arguments as elements.
2943 The arguments should be the ARGLIST, bytecode-string BYTE-CODE, constant
2944 vector CONSTANTS, maximum stack size DEPTH, (optional) DOCSTRING,
2945 and (optional) INTERACTIVE-SPEC.
2946 The first four arguments are required; at most six have any
2948 The ARGLIST can be either like the one of `lambda', in which case the arguments
2949 will be dynamically bound before executing the byte code, or it can be an
2950 integer of the form NNNNNNNRMMMMMMM where the 7bit MMMMMMM specifies the
2951 minimum number of arguments, the 7-bit NNNNNNN specifies the maximum number
2952 of arguments (ignoring &rest) and the R bit specifies whether there is a &rest
2953 argument to catch the left-over arguments. If such an integer is used, the
2954 arguments will not be dynamically bound but will be instead pushed on the
2955 stack before executing the byte-code.
2956 usage: (make-byte-code ARGLIST BYTE-CODE CONSTANTS DEPTH &optional DOCSTRING INTERACTIVE-SPEC &rest ELEMENTS) */)
2957 (register size_t nargs
, Lisp_Object
*args
)
2959 register Lisp_Object len
, val
;
2961 register struct Lisp_Vector
*p
;
2963 XSETFASTINT (len
, nargs
);
2964 if (!NILP (Vpurify_flag
))
2965 val
= make_pure_vector ((EMACS_INT
) nargs
);
2967 val
= Fmake_vector (len
, Qnil
);
2969 if (nargs
> 1 && STRINGP (args
[1]) && STRING_MULTIBYTE (args
[1]))
2970 /* BYTECODE-STRING must have been produced by Emacs 20.2 or the
2971 earlier because they produced a raw 8-bit string for byte-code
2972 and now such a byte-code string is loaded as multibyte while
2973 raw 8-bit characters converted to multibyte form. Thus, now we
2974 must convert them back to the original unibyte form. */
2975 args
[1] = Fstring_as_unibyte (args
[1]);
2978 for (i
= 0; i
< nargs
; i
++)
2980 if (!NILP (Vpurify_flag
))
2981 args
[i
] = Fpurecopy (args
[i
]);
2982 p
->contents
[i
] = args
[i
];
2984 XSETPVECTYPE (p
, PVEC_COMPILED
);
2985 XSETCOMPILED (val
, p
);
2991 /***********************************************************************
2993 ***********************************************************************/
2995 /* Each symbol_block is just under 1020 bytes long, since malloc
2996 really allocates in units of powers of two and uses 4 bytes for its
2999 #define SYMBOL_BLOCK_SIZE \
3000 ((1020 - sizeof (struct symbol_block *)) / sizeof (struct Lisp_Symbol))
3004 /* Place `symbols' first, to preserve alignment. */
3005 struct Lisp_Symbol symbols
[SYMBOL_BLOCK_SIZE
];
3006 struct symbol_block
*next
;
3009 /* Current symbol block and index of first unused Lisp_Symbol
3012 static struct symbol_block
*symbol_block
;
3013 static int symbol_block_index
;
3015 /* List of free symbols. */
3017 static struct Lisp_Symbol
*symbol_free_list
;
3019 /* Total number of symbol blocks now in use. */
3021 static int n_symbol_blocks
;
3024 /* Initialize symbol allocation. */
3029 symbol_block
= NULL
;
3030 symbol_block_index
= SYMBOL_BLOCK_SIZE
;
3031 symbol_free_list
= 0;
3032 n_symbol_blocks
= 0;
3036 DEFUE ("make-symbol", Fmake_symbol
, Smake_symbol
, 1, 1, 0,
3037 doc
: /* Return a newly allocated uninterned symbol whose name is NAME.
3038 Its value and function definition are void, and its property list is nil. */)
3041 register Lisp_Object val
;
3042 register struct Lisp_Symbol
*p
;
3044 CHECK_STRING (name
);
3046 /* eassert (!handling_signal); */
3050 if (symbol_free_list
)
3052 XSETSYMBOL (val
, symbol_free_list
);
3053 symbol_free_list
= symbol_free_list
->next
;
3057 if (symbol_block_index
== SYMBOL_BLOCK_SIZE
)
3059 struct symbol_block
*new;
3060 new = (struct symbol_block
*) lisp_malloc (sizeof *new,
3062 new->next
= symbol_block
;
3064 symbol_block_index
= 0;
3067 XSETSYMBOL (val
, &symbol_block
->symbols
[symbol_block_index
]);
3068 symbol_block_index
++;
3071 MALLOC_UNBLOCK_INPUT
;
3076 p
->redirect
= SYMBOL_PLAINVAL
;
3077 SET_SYMBOL_VAL (p
, Qunbound
);
3078 p
->function
= Qunbound
;
3081 p
->interned
= SYMBOL_UNINTERNED
;
3083 p
->declared_special
= 0;
3084 consing_since_gc
+= sizeof (struct Lisp_Symbol
);
3091 /***********************************************************************
3092 Marker (Misc) Allocation
3093 ***********************************************************************/
3095 /* Allocation of markers and other objects that share that structure.
3096 Works like allocation of conses. */
3098 #define MARKER_BLOCK_SIZE \
3099 ((1020 - sizeof (struct marker_block *)) / sizeof (union Lisp_Misc))
3103 /* Place `markers' first, to preserve alignment. */
3104 union Lisp_Misc markers
[MARKER_BLOCK_SIZE
];
3105 struct marker_block
*next
;
3108 static struct marker_block
*marker_block
;
3109 static int marker_block_index
;
3111 static union Lisp_Misc
*marker_free_list
;
3113 /* Total number of marker blocks now in use. */
3115 static int n_marker_blocks
;
3120 marker_block
= NULL
;
3121 marker_block_index
= MARKER_BLOCK_SIZE
;
3122 marker_free_list
= 0;
3123 n_marker_blocks
= 0;
3126 /* Return a newly allocated Lisp_Misc object, with no substructure. */
3129 allocate_misc (void)
3133 /* eassert (!handling_signal); */
3137 if (marker_free_list
)
3139 XSETMISC (val
, marker_free_list
);
3140 marker_free_list
= marker_free_list
->u_free
.chain
;
3144 if (marker_block_index
== MARKER_BLOCK_SIZE
)
3146 struct marker_block
*new;
3147 new = (struct marker_block
*) lisp_malloc (sizeof *new,
3149 new->next
= marker_block
;
3151 marker_block_index
= 0;
3153 total_free_markers
+= MARKER_BLOCK_SIZE
;
3155 XSETMISC (val
, &marker_block
->markers
[marker_block_index
]);
3156 marker_block_index
++;
3159 MALLOC_UNBLOCK_INPUT
;
3161 --total_free_markers
;
3162 consing_since_gc
+= sizeof (union Lisp_Misc
);
3163 misc_objects_consed
++;
3164 XMISCANY (val
)->gcmarkbit
= 0;
3168 /* Free a Lisp_Misc object */
3171 free_misc (Lisp_Object misc
)
3173 XMISCTYPE (misc
) = Lisp_Misc_Free
;
3174 XMISC (misc
)->u_free
.chain
= marker_free_list
;
3175 marker_free_list
= XMISC (misc
);
3177 total_free_markers
++;
3180 /* Return a Lisp_Misc_Save_Value object containing POINTER and
3181 INTEGER. This is used to package C values to call record_unwind_protect.
3182 The unwind function can get the C values back using XSAVE_VALUE. */
3185 make_save_value (void *pointer
, int integer
)
3187 register Lisp_Object val
;
3188 register struct Lisp_Save_Value
*p
;
3190 val
= allocate_misc ();
3191 XMISCTYPE (val
) = Lisp_Misc_Save_Value
;
3192 p
= XSAVE_VALUE (val
);
3193 p
->pointer
= pointer
;
3194 p
->integer
= integer
;
3199 DEFUE ("make-marker", Fmake_marker
, Smake_marker
, 0, 0, 0,
3200 doc
: /* Return a newly allocated marker which does not point at any place. */)
3203 register Lisp_Object val
;
3204 register struct Lisp_Marker
*p
;
3206 val
= allocate_misc ();
3207 XMISCTYPE (val
) = Lisp_Misc_Marker
;
3213 p
->insertion_type
= 0;
3217 /* Put MARKER back on the free list after using it temporarily. */
3220 free_marker (Lisp_Object marker
)
3222 unchain_marker (XMARKER (marker
));
3227 /* Return a newly created vector or string with specified arguments as
3228 elements. If all the arguments are characters that can fit
3229 in a string of events, make a string; otherwise, make a vector.
3231 Any number of arguments, even zero arguments, are allowed. */
3234 make_event_array (register int nargs
, Lisp_Object
*args
)
3238 for (i
= 0; i
< nargs
; i
++)
3239 /* The things that fit in a string
3240 are characters that are in 0...127,
3241 after discarding the meta bit and all the bits above it. */
3242 if (!INTEGERP (args
[i
])
3243 || (XUINT (args
[i
]) & ~(-CHAR_META
)) >= 0200)
3244 return Fvector (nargs
, args
);
3246 /* Since the loop exited, we know that all the things in it are
3247 characters, so we can make a string. */
3251 result
= Fmake_string (make_number (nargs
), make_number (0));
3252 for (i
= 0; i
< nargs
; i
++)
3254 SSET (result
, i
, XINT (args
[i
]));
3255 /* Move the meta bit to the right place for a string char. */
3256 if (XINT (args
[i
]) & CHAR_META
)
3257 SSET (result
, i
, SREF (result
, i
) | 0x80);
3266 /************************************************************************
3267 Memory Full Handling
3268 ************************************************************************/
3271 /* Called if malloc returns zero. */
3280 memory_full_cons_threshold
= sizeof (struct cons_block
);
3282 /* The first time we get here, free the spare memory. */
3283 for (i
= 0; i
< sizeof (spare_memory
) / sizeof (char *); i
++)
3284 if (spare_memory
[i
])
3287 free (spare_memory
[i
]);
3288 else if (i
>= 1 && i
<= 4)
3289 lisp_align_free (spare_memory
[i
]);
3291 lisp_free (spare_memory
[i
]);
3292 spare_memory
[i
] = 0;
3295 /* Record the space now used. When it decreases substantially,
3296 we can refill the memory reserve. */
3297 #ifndef SYSTEM_MALLOC
3298 bytes_used_when_full
= BYTES_USED
;
3301 /* This used to call error, but if we've run out of memory, we could
3302 get infinite recursion trying to build the string. */
3303 xsignal (Qnil
, Vmemory_signal_data
);
3306 /* If we released our reserve (due to running out of memory),
3307 and we have a fair amount free once again,
3308 try to set aside another reserve in case we run out once more.
3310 This is called when a relocatable block is freed in ralloc.c,
3311 and also directly from this file, in case we're not using ralloc.c. */
3314 refill_memory_reserve (void)
3316 #ifndef SYSTEM_MALLOC
3317 if (spare_memory
[0] == 0)
3318 spare_memory
[0] = (char *) malloc ((size_t) SPARE_MEMORY
);
3319 if (spare_memory
[1] == 0)
3320 spare_memory
[1] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3322 if (spare_memory
[2] == 0)
3323 spare_memory
[2] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3325 if (spare_memory
[3] == 0)
3326 spare_memory
[3] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3328 if (spare_memory
[4] == 0)
3329 spare_memory
[4] = (char *) lisp_align_malloc (sizeof (struct cons_block
),
3331 if (spare_memory
[5] == 0)
3332 spare_memory
[5] = (char *) lisp_malloc (sizeof (struct string_block
),
3334 if (spare_memory
[6] == 0)
3335 spare_memory
[6] = (char *) lisp_malloc (sizeof (struct string_block
),
3337 if (spare_memory
[0] && spare_memory
[1] && spare_memory
[5])
3338 Vmemory_full
= Qnil
;
3342 /************************************************************************
3344 ************************************************************************/
3346 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
3348 /* Conservative C stack marking requires a method to identify possibly
3349 live Lisp objects given a pointer value. We do this by keeping
3350 track of blocks of Lisp data that are allocated in a red-black tree
3351 (see also the comment of mem_node which is the type of nodes in
3352 that tree). Function lisp_malloc adds information for an allocated
3353 block to the red-black tree with calls to mem_insert, and function
3354 lisp_free removes it with mem_delete. Functions live_string_p etc
3355 call mem_find to lookup information about a given pointer in the
3356 tree, and use that to determine if the pointer points to a Lisp
3359 /* Initialize this part of alloc.c. */
3364 mem_z
.left
= mem_z
.right
= MEM_NIL
;
3365 mem_z
.parent
= NULL
;
3366 mem_z
.color
= MEM_BLACK
;
3367 mem_z
.start
= mem_z
.end
= NULL
;
3372 /* Value is a pointer to the mem_node containing START. Value is
3373 MEM_NIL if there is no node in the tree containing START. */
3375 static INLINE
struct mem_node
*
3376 mem_find (void *start
)
3380 if (start
< min_heap_address
|| start
> max_heap_address
)
3383 /* Make the search always successful to speed up the loop below. */
3384 mem_z
.start
= start
;
3385 mem_z
.end
= (char *) start
+ 1;
3388 while (start
< p
->start
|| start
>= p
->end
)
3389 p
= start
< p
->start
? p
->left
: p
->right
;
3394 /* Insert a new node into the tree for a block of memory with start
3395 address START, end address END, and type TYPE. Value is a
3396 pointer to the node that was inserted. */
3398 static struct mem_node
*
3399 mem_insert (void *start
, void *end
, enum mem_type type
)
3401 struct mem_node
*c
, *parent
, *x
;
3403 if (min_heap_address
== NULL
|| start
< min_heap_address
)
3404 min_heap_address
= start
;
3405 if (max_heap_address
== NULL
|| end
> max_heap_address
)
3406 max_heap_address
= end
;
3408 /* See where in the tree a node for START belongs. In this
3409 particular application, it shouldn't happen that a node is already
3410 present. For debugging purposes, let's check that. */
3414 #if GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS
3416 while (c
!= MEM_NIL
)
3418 if (start
>= c
->start
&& start
< c
->end
)
3421 c
= start
< c
->start
? c
->left
: c
->right
;
3424 #else /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */
3426 while (c
!= MEM_NIL
)
3429 c
= start
< c
->start
? c
->left
: c
->right
;
3432 #endif /* GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS */
3434 /* Create a new node. */
3435 #ifdef GC_MALLOC_CHECK
3436 x
= (struct mem_node
*) _malloc_internal (sizeof *x
);
3440 x
= (struct mem_node
*) xmalloc (sizeof *x
);
3446 x
->left
= x
->right
= MEM_NIL
;
3449 /* Insert it as child of PARENT or install it as root. */
3452 if (start
< parent
->start
)
3460 /* Re-establish red-black tree properties. */
3461 mem_insert_fixup (x
);
3467 /* Re-establish the red-black properties of the tree, and thereby
3468 balance the tree, after node X has been inserted; X is always red. */
3471 mem_insert_fixup (struct mem_node
*x
)
3473 while (x
!= mem_root
&& x
->parent
->color
== MEM_RED
)
3475 /* X is red and its parent is red. This is a violation of
3476 red-black tree property #3. */
3478 if (x
->parent
== x
->parent
->parent
->left
)
3480 /* We're on the left side of our grandparent, and Y is our
3482 struct mem_node
*y
= x
->parent
->parent
->right
;
3484 if (y
->color
== MEM_RED
)
3486 /* Uncle and parent are red but should be black because
3487 X is red. Change the colors accordingly and proceed
3488 with the grandparent. */
3489 x
->parent
->color
= MEM_BLACK
;
3490 y
->color
= MEM_BLACK
;
3491 x
->parent
->parent
->color
= MEM_RED
;
3492 x
= x
->parent
->parent
;
3496 /* Parent and uncle have different colors; parent is
3497 red, uncle is black. */
3498 if (x
== x
->parent
->right
)
3501 mem_rotate_left (x
);
3504 x
->parent
->color
= MEM_BLACK
;
3505 x
->parent
->parent
->color
= MEM_RED
;
3506 mem_rotate_right (x
->parent
->parent
);
3511 /* This is the symmetrical case of above. */
3512 struct mem_node
*y
= x
->parent
->parent
->left
;
3514 if (y
->color
== MEM_RED
)
3516 x
->parent
->color
= MEM_BLACK
;
3517 y
->color
= MEM_BLACK
;
3518 x
->parent
->parent
->color
= MEM_RED
;
3519 x
= x
->parent
->parent
;
3523 if (x
== x
->parent
->left
)
3526 mem_rotate_right (x
);
3529 x
->parent
->color
= MEM_BLACK
;
3530 x
->parent
->parent
->color
= MEM_RED
;
3531 mem_rotate_left (x
->parent
->parent
);
3536 /* The root may have been changed to red due to the algorithm. Set
3537 it to black so that property #5 is satisfied. */
3538 mem_root
->color
= MEM_BLACK
;
3549 mem_rotate_left (struct mem_node
*x
)
3553 /* Turn y's left sub-tree into x's right sub-tree. */
3556 if (y
->left
!= MEM_NIL
)
3557 y
->left
->parent
= x
;
3559 /* Y's parent was x's parent. */
3561 y
->parent
= x
->parent
;
3563 /* Get the parent to point to y instead of x. */
3566 if (x
== x
->parent
->left
)
3567 x
->parent
->left
= y
;
3569 x
->parent
->right
= y
;
3574 /* Put x on y's left. */
3588 mem_rotate_right (struct mem_node
*x
)
3590 struct mem_node
*y
= x
->left
;
3593 if (y
->right
!= MEM_NIL
)
3594 y
->right
->parent
= x
;
3597 y
->parent
= x
->parent
;
3600 if (x
== x
->parent
->right
)
3601 x
->parent
->right
= y
;
3603 x
->parent
->left
= y
;
3614 /* Delete node Z from the tree. If Z is null or MEM_NIL, do nothing. */
3617 mem_delete (struct mem_node
*z
)
3619 struct mem_node
*x
, *y
;
3621 if (!z
|| z
== MEM_NIL
)
3624 if (z
->left
== MEM_NIL
|| z
->right
== MEM_NIL
)
3629 while (y
->left
!= MEM_NIL
)
3633 if (y
->left
!= MEM_NIL
)
3638 x
->parent
= y
->parent
;
3641 if (y
== y
->parent
->left
)
3642 y
->parent
->left
= x
;
3644 y
->parent
->right
= x
;
3651 z
->start
= y
->start
;
3656 if (y
->color
== MEM_BLACK
)
3657 mem_delete_fixup (x
);
3659 #ifdef GC_MALLOC_CHECK
3667 /* Re-establish the red-black properties of the tree, after a
3671 mem_delete_fixup (struct mem_node
*x
)
3673 while (x
!= mem_root
&& x
->color
== MEM_BLACK
)
3675 if (x
== x
->parent
->left
)
3677 struct mem_node
*w
= x
->parent
->right
;
3679 if (w
->color
== MEM_RED
)
3681 w
->color
= MEM_BLACK
;
3682 x
->parent
->color
= MEM_RED
;
3683 mem_rotate_left (x
->parent
);
3684 w
= x
->parent
->right
;
3687 if (w
->left
->color
== MEM_BLACK
&& w
->right
->color
== MEM_BLACK
)
3694 if (w
->right
->color
== MEM_BLACK
)
3696 w
->left
->color
= MEM_BLACK
;
3698 mem_rotate_right (w
);
3699 w
= x
->parent
->right
;
3701 w
->color
= x
->parent
->color
;
3702 x
->parent
->color
= MEM_BLACK
;
3703 w
->right
->color
= MEM_BLACK
;
3704 mem_rotate_left (x
->parent
);
3710 struct mem_node
*w
= x
->parent
->left
;
3712 if (w
->color
== MEM_RED
)
3714 w
->color
= MEM_BLACK
;
3715 x
->parent
->color
= MEM_RED
;
3716 mem_rotate_right (x
->parent
);
3717 w
= x
->parent
->left
;
3720 if (w
->right
->color
== MEM_BLACK
&& w
->left
->color
== MEM_BLACK
)
3727 if (w
->left
->color
== MEM_BLACK
)
3729 w
->right
->color
= MEM_BLACK
;
3731 mem_rotate_left (w
);
3732 w
= x
->parent
->left
;
3735 w
->color
= x
->parent
->color
;
3736 x
->parent
->color
= MEM_BLACK
;
3737 w
->left
->color
= MEM_BLACK
;
3738 mem_rotate_right (x
->parent
);
3744 x
->color
= MEM_BLACK
;
3748 /* Value is non-zero if P is a pointer to a live Lisp string on
3749 the heap. M is a pointer to the mem_block for P. */
3752 live_string_p (struct mem_node
*m
, void *p
)
3754 if (m
->type
== MEM_TYPE_STRING
)
3756 struct string_block
*b
= (struct string_block
*) m
->start
;
3757 ptrdiff_t offset
= (char *) p
- (char *) &b
->strings
[0];
3759 /* P must point to the start of a Lisp_String structure, and it
3760 must not be on the free-list. */
3762 && offset
% sizeof b
->strings
[0] == 0
3763 && offset
< (STRING_BLOCK_SIZE
* sizeof b
->strings
[0])
3764 && ((struct Lisp_String
*) p
)->data
!= NULL
);
3771 /* Value is non-zero if P is a pointer to a live Lisp cons on
3772 the heap. M is a pointer to the mem_block for P. */
3775 live_cons_p (struct mem_node
*m
, void *p
)
3777 if (m
->type
== MEM_TYPE_CONS
)
3779 struct cons_block
*b
= (struct cons_block
*) m
->start
;
3780 ptrdiff_t offset
= (char *) p
- (char *) &b
->conses
[0];
3782 /* P must point to the start of a Lisp_Cons, not be
3783 one of the unused cells in the current cons block,
3784 and not be on the free-list. */
3786 && offset
% sizeof b
->conses
[0] == 0
3787 && offset
< (CONS_BLOCK_SIZE
* sizeof b
->conses
[0])
3789 || offset
/ sizeof b
->conses
[0] < cons_block_index
)
3790 && !EQ (((struct Lisp_Cons
*) p
)->car
, Vdead
));
3797 /* Value is non-zero if P is a pointer to a live Lisp symbol on
3798 the heap. M is a pointer to the mem_block for P. */
3801 live_symbol_p (struct mem_node
*m
, void *p
)
3803 if (m
->type
== MEM_TYPE_SYMBOL
)
3805 struct symbol_block
*b
= (struct symbol_block
*) m
->start
;
3806 ptrdiff_t offset
= (char *) p
- (char *) &b
->symbols
[0];
3808 /* P must point to the start of a Lisp_Symbol, not be
3809 one of the unused cells in the current symbol block,
3810 and not be on the free-list. */
3812 && offset
% sizeof b
->symbols
[0] == 0
3813 && offset
< (SYMBOL_BLOCK_SIZE
* sizeof b
->symbols
[0])
3814 && (b
!= symbol_block
3815 || offset
/ sizeof b
->symbols
[0] < symbol_block_index
)
3816 && !EQ (((struct Lisp_Symbol
*) p
)->function
, Vdead
));
3823 /* Value is non-zero if P is a pointer to a live Lisp float on
3824 the heap. M is a pointer to the mem_block for P. */
3827 live_float_p (struct mem_node
*m
, void *p
)
3829 if (m
->type
== MEM_TYPE_FLOAT
)
3831 struct float_block
*b
= (struct float_block
*) m
->start
;
3832 ptrdiff_t offset
= (char *) p
- (char *) &b
->floats
[0];
3834 /* P must point to the start of a Lisp_Float and not be
3835 one of the unused cells in the current float block. */
3837 && offset
% sizeof b
->floats
[0] == 0
3838 && offset
< (FLOAT_BLOCK_SIZE
* sizeof b
->floats
[0])
3839 && (b
!= float_block
3840 || offset
/ sizeof b
->floats
[0] < float_block_index
));
3847 /* Value is non-zero if P is a pointer to a live Lisp Misc on
3848 the heap. M is a pointer to the mem_block for P. */
3851 live_misc_p (struct mem_node
*m
, void *p
)
3853 if (m
->type
== MEM_TYPE_MISC
)
3855 struct marker_block
*b
= (struct marker_block
*) m
->start
;
3856 ptrdiff_t offset
= (char *) p
- (char *) &b
->markers
[0];
3858 /* P must point to the start of a Lisp_Misc, not be
3859 one of the unused cells in the current misc block,
3860 and not be on the free-list. */
3862 && offset
% sizeof b
->markers
[0] == 0
3863 && offset
< (MARKER_BLOCK_SIZE
* sizeof b
->markers
[0])
3864 && (b
!= marker_block
3865 || offset
/ sizeof b
->markers
[0] < marker_block_index
)
3866 && ((union Lisp_Misc
*) p
)->u_any
.type
!= Lisp_Misc_Free
);
3873 /* Value is non-zero if P is a pointer to a live vector-like object.
3874 M is a pointer to the mem_block for P. */
3877 live_vector_p (struct mem_node
*m
, void *p
)
3879 return (p
== m
->start
&& m
->type
== MEM_TYPE_VECTORLIKE
);
3883 /* Value is non-zero if P is a pointer to a live buffer. M is a
3884 pointer to the mem_block for P. */
3887 live_buffer_p (struct mem_node
*m
, void *p
)
3889 /* P must point to the start of the block, and the buffer
3890 must not have been killed. */
3891 return (m
->type
== MEM_TYPE_BUFFER
3893 && !NILP (((struct buffer
*) p
)->BUFFER_INTERNAL_FIELD (name
)));
3896 #endif /* GC_MARK_STACK || defined GC_MALLOC_CHECK */
3900 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
3902 /* Array of objects that are kept alive because the C stack contains
3903 a pattern that looks like a reference to them . */
3905 #define MAX_ZOMBIES 10
3906 static Lisp_Object zombies
[MAX_ZOMBIES
];
3908 /* Number of zombie objects. */
3910 static int nzombies
;
3912 /* Number of garbage collections. */
3916 /* Average percentage of zombies per collection. */
3918 static double avg_zombies
;
3920 /* Max. number of live and zombie objects. */
3922 static int max_live
, max_zombies
;
3924 /* Average number of live objects per GC. */
3926 static double avg_live
;
3928 DEFUE ("gc-status", Fgc_status
, Sgc_status
, 0, 0, "",
3929 doc
: /* Show information about live and zombie objects. */)
3932 Lisp_Object args
[8], zombie_list
= Qnil
;
3934 for (i
= 0; i
< nzombies
; i
++)
3935 zombie_list
= Fcons (zombies
[i
], zombie_list
);
3936 args
[0] = build_string ("%d GCs, avg live/zombies = %.2f/%.2f (%f%%), max %d/%d\nzombies: %S");
3937 args
[1] = make_number (ngcs
);
3938 args
[2] = make_float (avg_live
);
3939 args
[3] = make_float (avg_zombies
);
3940 args
[4] = make_float (avg_zombies
/ avg_live
/ 100);
3941 args
[5] = make_number (max_live
);
3942 args
[6] = make_number (max_zombies
);
3943 args
[7] = zombie_list
;
3944 return Fmessage (8, args
);
3947 #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */
3950 /* Mark OBJ if we can prove it's a Lisp_Object. */
3953 mark_maybe_object (Lisp_Object obj
)
3961 po
= (void *) XPNTR (obj
);
3968 switch (XTYPE (obj
))
3971 mark_p
= (live_string_p (m
, po
)
3972 && !STRING_MARKED_P ((struct Lisp_String
*) po
));
3976 mark_p
= (live_cons_p (m
, po
) && !CONS_MARKED_P (XCONS (obj
)));
3980 mark_p
= (live_symbol_p (m
, po
) && !XSYMBOL (obj
)->gcmarkbit
);
3984 mark_p
= (live_float_p (m
, po
) && !FLOAT_MARKED_P (XFLOAT (obj
)));
3987 case Lisp_Vectorlike
:
3988 /* Note: can't check BUFFERP before we know it's a
3989 buffer because checking that dereferences the pointer
3990 PO which might point anywhere. */
3991 if (live_vector_p (m
, po
))
3992 mark_p
= !SUBRP (obj
) && !VECTOR_MARKED_P (XVECTOR (obj
));
3993 else if (live_buffer_p (m
, po
))
3994 mark_p
= BUFFERP (obj
) && !VECTOR_MARKED_P (XBUFFER (obj
));
3998 mark_p
= (live_misc_p (m
, po
) && !XMISCANY (obj
)->gcmarkbit
);
4007 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4008 if (nzombies
< MAX_ZOMBIES
)
4009 zombies
[nzombies
] = obj
;
4018 /* If P points to Lisp data, mark that as live if it isn't already
4022 mark_maybe_pointer (void *p
)
4026 /* Quickly rule out some values which can't point to Lisp data. */
4029 8 /* USE_LSB_TAG needs Lisp data to be aligned on multiples of 8. */
4031 2 /* We assume that Lisp data is aligned on even addresses. */
4039 Lisp_Object obj
= Qnil
;
4043 case MEM_TYPE_NON_LISP
:
4044 /* Nothing to do; not a pointer to Lisp memory. */
4047 case MEM_TYPE_BUFFER
:
4048 if (live_buffer_p (m
, p
) && !VECTOR_MARKED_P((struct buffer
*)p
))
4049 XSETVECTOR (obj
, p
);
4053 if (live_cons_p (m
, p
) && !CONS_MARKED_P ((struct Lisp_Cons
*) p
))
4057 case MEM_TYPE_STRING
:
4058 if (live_string_p (m
, p
)
4059 && !STRING_MARKED_P ((struct Lisp_String
*) p
))
4060 XSETSTRING (obj
, p
);
4064 if (live_misc_p (m
, p
) && !((struct Lisp_Free
*) p
)->gcmarkbit
)
4068 case MEM_TYPE_SYMBOL
:
4069 if (live_symbol_p (m
, p
) && !((struct Lisp_Symbol
*) p
)->gcmarkbit
)
4070 XSETSYMBOL (obj
, p
);
4073 case MEM_TYPE_FLOAT
:
4074 if (live_float_p (m
, p
) && !FLOAT_MARKED_P (p
))
4078 case MEM_TYPE_VECTORLIKE
:
4079 if (live_vector_p (m
, p
))
4082 XSETVECTOR (tem
, p
);
4083 if (!SUBRP (tem
) && !VECTOR_MARKED_P (XVECTOR (tem
)))
4098 /* Mark Lisp objects referenced from the address range START+OFFSET..END
4099 or END+OFFSET..START. */
4102 mark_memory (void *start
, void *end
, int offset
)
4107 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4111 /* Make START the pointer to the start of the memory region,
4112 if it isn't already. */
4120 /* Mark Lisp_Objects. */
4121 for (p
= (Lisp_Object
*) ((char *) start
+ offset
); (void *) p
< end
; ++p
)
4122 mark_maybe_object (*p
);
4124 /* Mark Lisp data pointed to. This is necessary because, in some
4125 situations, the C compiler optimizes Lisp objects away, so that
4126 only a pointer to them remains. Example:
4128 DEFUN ("testme", Ftestme, Stestme, 0, 0, 0, "")
4131 Lisp_Object obj = build_string ("test");
4132 struct Lisp_String *s = XSTRING (obj);
4133 Fgarbage_collect ();
4134 fprintf (stderr, "test `%s'\n", s->data);
4138 Here, `obj' isn't really used, and the compiler optimizes it
4139 away. The only reference to the life string is through the
4142 for (pp
= (void **) ((char *) start
+ offset
); (void *) pp
< end
; ++pp
)
4143 mark_maybe_pointer (*pp
);
4146 /* setjmp will work with GCC unless NON_SAVING_SETJMP is defined in
4147 the GCC system configuration. In gcc 3.2, the only systems for
4148 which this is so are i386-sco5 non-ELF, i386-sysv3 (maybe included
4149 by others?) and ns32k-pc532-min. */
4151 #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS
4153 static int setjmp_tested_p
, longjmps_done
;
4155 #define SETJMP_WILL_LIKELY_WORK "\
4157 Emacs garbage collector has been changed to use conservative stack\n\
4158 marking. Emacs has determined that the method it uses to do the\n\
4159 marking will likely work on your system, but this isn't sure.\n\
4161 If you are a system-programmer, or can get the help of a local wizard\n\
4162 who is, please take a look at the function mark_stack in alloc.c, and\n\
4163 verify that the methods used are appropriate for your system.\n\
4165 Please mail the result to <emacs-devel@gnu.org>.\n\
4168 #define SETJMP_WILL_NOT_WORK "\
4170 Emacs garbage collector has been changed to use conservative stack\n\
4171 marking. Emacs has determined that the default method it uses to do the\n\
4172 marking will not work on your system. We will need a system-dependent\n\
4173 solution for your system.\n\
4175 Please take a look at the function mark_stack in alloc.c, and\n\
4176 try to find a way to make it work on your system.\n\
4178 Note that you may get false negatives, depending on the compiler.\n\
4179 In particular, you need to use -O with GCC for this test.\n\
4181 Please mail the result to <emacs-devel@gnu.org>.\n\
4185 /* Perform a quick check if it looks like setjmp saves registers in a
4186 jmp_buf. Print a message to stderr saying so. When this test
4187 succeeds, this is _not_ a proof that setjmp is sufficient for
4188 conservative stack marking. Only the sources or a disassembly
4199 /* Arrange for X to be put in a register. */
4205 if (longjmps_done
== 1)
4207 /* Came here after the longjmp at the end of the function.
4209 If x == 1, the longjmp has restored the register to its
4210 value before the setjmp, and we can hope that setjmp
4211 saves all such registers in the jmp_buf, although that
4214 For other values of X, either something really strange is
4215 taking place, or the setjmp just didn't save the register. */
4218 fprintf (stderr
, SETJMP_WILL_LIKELY_WORK
);
4221 fprintf (stderr
, SETJMP_WILL_NOT_WORK
);
4228 if (longjmps_done
== 1)
4232 #endif /* not GC_SAVE_REGISTERS_ON_STACK && not GC_SETJMP_WORKS */
4235 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
4237 /* Abort if anything GCPRO'd doesn't survive the GC. */
4245 for (p
= gcprolist
; p
; p
= p
->next
)
4246 for (i
= 0; i
< p
->nvars
; ++i
)
4247 if (!survives_gc_p (p
->var
[i
]))
4248 /* FIXME: It's not necessarily a bug. It might just be that the
4249 GCPRO is unnecessary or should release the object sooner. */
4253 #elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
4260 fprintf (stderr
, "\nZombies kept alive = %d:\n", nzombies
);
4261 for (i
= 0; i
< min (MAX_ZOMBIES
, nzombies
); ++i
)
4263 fprintf (stderr
, " %d = ", i
);
4264 debug_print (zombies
[i
]);
4268 #endif /* GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES */
4271 /* Mark live Lisp objects on the C stack.
4273 There are several system-dependent problems to consider when
4274 porting this to new architectures:
4278 We have to mark Lisp objects in CPU registers that can hold local
4279 variables or are used to pass parameters.
4281 If GC_SAVE_REGISTERS_ON_STACK is defined, it should expand to
4282 something that either saves relevant registers on the stack, or
4283 calls mark_maybe_object passing it each register's contents.
4285 If GC_SAVE_REGISTERS_ON_STACK is not defined, the current
4286 implementation assumes that calling setjmp saves registers we need
4287 to see in a jmp_buf which itself lies on the stack. This doesn't
4288 have to be true! It must be verified for each system, possibly
4289 by taking a look at the source code of setjmp.
4291 If __builtin_unwind_init is available (defined by GCC >= 2.8) we
4292 can use it as a machine independent method to store all registers
4293 to the stack. In this case the macros described in the previous
4294 two paragraphs are not used.
4298 Architectures differ in the way their processor stack is organized.
4299 For example, the stack might look like this
4302 | Lisp_Object | size = 4
4304 | something else | size = 2
4306 | Lisp_Object | size = 4
4310 In such a case, not every Lisp_Object will be aligned equally. To
4311 find all Lisp_Object on the stack it won't be sufficient to walk
4312 the stack in steps of 4 bytes. Instead, two passes will be
4313 necessary, one starting at the start of the stack, and a second
4314 pass starting at the start of the stack + 2. Likewise, if the
4315 minimal alignment of Lisp_Objects on the stack is 1, four passes
4316 would be necessary, each one starting with one byte more offset
4317 from the stack start.
4319 The current code assumes by default that Lisp_Objects are aligned
4320 equally on the stack. */
4328 #ifdef HAVE___BUILTIN_UNWIND_INIT
4329 /* Force callee-saved registers and register windows onto the stack.
4330 This is the preferred method if available, obviating the need for
4331 machine dependent methods. */
4332 __builtin_unwind_init ();
4334 #else /* not HAVE___BUILTIN_UNWIND_INIT */
4335 #ifndef GC_SAVE_REGISTERS_ON_STACK
4336 /* jmp_buf may not be aligned enough on darwin-ppc64 */
4337 union aligned_jmpbuf
{
4341 volatile int stack_grows_down_p
= (char *) &j
> (char *) stack_base
;
4343 /* This trick flushes the register windows so that all the state of
4344 the process is contained in the stack. */
4345 /* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is
4346 needed on ia64 too. See mach_dep.c, where it also says inline
4347 assembler doesn't work with relevant proprietary compilers. */
4349 #if defined (__sparc64__) && defined (__FreeBSD__)
4350 /* FreeBSD does not have a ta 3 handler. */
4357 /* Save registers that we need to see on the stack. We need to see
4358 registers used to hold register variables and registers used to
4360 #ifdef GC_SAVE_REGISTERS_ON_STACK
4361 GC_SAVE_REGISTERS_ON_STACK (end
);
4362 #else /* not GC_SAVE_REGISTERS_ON_STACK */
4364 #ifndef GC_SETJMP_WORKS /* If it hasn't been checked yet that
4365 setjmp will definitely work, test it
4366 and print a message with the result
4368 if (!setjmp_tested_p
)
4370 setjmp_tested_p
= 1;
4373 #endif /* GC_SETJMP_WORKS */
4376 end
= stack_grows_down_p
? (char *) &j
+ sizeof j
: (char *) &j
;
4377 #endif /* not GC_SAVE_REGISTERS_ON_STACK */
4378 #endif /* not HAVE___BUILTIN_UNWIND_INIT */
4380 /* This assumes that the stack is a contiguous region in memory. If
4381 that's not the case, something has to be done here to iterate
4382 over the stack segments. */
4383 #ifndef GC_LISP_OBJECT_ALIGNMENT
4385 #define GC_LISP_OBJECT_ALIGNMENT __alignof__ (Lisp_Object)
4387 #define GC_LISP_OBJECT_ALIGNMENT sizeof (Lisp_Object)
4390 for (i
= 0; i
< sizeof (Lisp_Object
); i
+= GC_LISP_OBJECT_ALIGNMENT
)
4391 mark_memory (stack_base
, end
, i
);
4392 /* Allow for marking a secondary stack, like the register stack on the
4394 #ifdef GC_MARK_SECONDARY_STACK
4395 GC_MARK_SECONDARY_STACK ();
4398 #if GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS
4403 #endif /* GC_MARK_STACK != 0 */
4406 /* Determine whether it is safe to access memory at address P. */
4408 valid_pointer_p (void *p
)
4411 return w32_valid_pointer_p (p
, 16);
4415 /* Obviously, we cannot just access it (we would SEGV trying), so we
4416 trick the o/s to tell us whether p is a valid pointer.
4417 Unfortunately, we cannot use NULL_DEVICE here, as emacs_write may
4418 not validate p in that case. */
4420 if ((fd
= emacs_open ("__Valid__Lisp__Object__", O_CREAT
| O_WRONLY
| O_TRUNC
, 0666)) >= 0)
4422 int valid
= (emacs_write (fd
, (char *)p
, 16) == 16);
4424 unlink ("__Valid__Lisp__Object__");
4432 /* Return 1 if OBJ is a valid lisp object.
4433 Return 0 if OBJ is NOT a valid lisp object.
4434 Return -1 if we cannot validate OBJ.
4435 This function can be quite slow,
4436 so it should only be used in code for manual debugging. */
4439 valid_lisp_object_p (Lisp_Object obj
)
4449 p
= (void *) XPNTR (obj
);
4450 if (PURE_POINTER_P (p
))
4454 return valid_pointer_p (p
);
4461 int valid
= valid_pointer_p (p
);
4473 case MEM_TYPE_NON_LISP
:
4476 case MEM_TYPE_BUFFER
:
4477 return live_buffer_p (m
, p
);
4480 return live_cons_p (m
, p
);
4482 case MEM_TYPE_STRING
:
4483 return live_string_p (m
, p
);
4486 return live_misc_p (m
, p
);
4488 case MEM_TYPE_SYMBOL
:
4489 return live_symbol_p (m
, p
);
4491 case MEM_TYPE_FLOAT
:
4492 return live_float_p (m
, p
);
4494 case MEM_TYPE_VECTORLIKE
:
4495 return live_vector_p (m
, p
);
4508 /***********************************************************************
4509 Pure Storage Management
4510 ***********************************************************************/
4512 /* Allocate room for SIZE bytes from pure Lisp storage and return a
4513 pointer to it. TYPE is the Lisp type for which the memory is
4514 allocated. TYPE < 0 means it's not used for a Lisp object. */
4516 static POINTER_TYPE
*
4517 pure_alloc (size_t size
, int type
)
4519 POINTER_TYPE
*result
;
4521 size_t alignment
= (1 << GCTYPEBITS
);
4523 size_t alignment
= sizeof (EMACS_INT
);
4525 /* Give Lisp_Floats an extra alignment. */
4526 if (type
== Lisp_Float
)
4528 #if defined __GNUC__ && __GNUC__ >= 2
4529 alignment
= __alignof (struct Lisp_Float
);
4531 alignment
= sizeof (struct Lisp_Float
);
4539 /* Allocate space for a Lisp object from the beginning of the free
4540 space with taking account of alignment. */
4541 result
= ALIGN (purebeg
+ pure_bytes_used_lisp
, alignment
);
4542 pure_bytes_used_lisp
= ((char *)result
- (char *)purebeg
) + size
;
4546 /* Allocate space for a non-Lisp object from the end of the free
4548 pure_bytes_used_non_lisp
+= size
;
4549 result
= purebeg
+ pure_size
- pure_bytes_used_non_lisp
;
4551 pure_bytes_used
= pure_bytes_used_lisp
+ pure_bytes_used_non_lisp
;
4553 if (pure_bytes_used
<= pure_size
)
4556 /* Don't allocate a large amount here,
4557 because it might get mmap'd and then its address
4558 might not be usable. */
4559 purebeg
= (char *) xmalloc (10000);
4561 pure_bytes_used_before_overflow
+= pure_bytes_used
- size
;
4562 pure_bytes_used
= 0;
4563 pure_bytes_used_lisp
= pure_bytes_used_non_lisp
= 0;
4568 /* Print a warning if PURESIZE is too small. */
4571 check_pure_size (void)
4573 if (pure_bytes_used_before_overflow
)
4574 message ("emacs:0:Pure Lisp storage overflow (approx. %d bytes needed)",
4575 (int) (pure_bytes_used
+ pure_bytes_used_before_overflow
));
4579 /* Find the byte sequence {DATA[0], ..., DATA[NBYTES-1], '\0'} from
4580 the non-Lisp data pool of the pure storage, and return its start
4581 address. Return NULL if not found. */
4584 find_string_data_in_pure (const char *data
, EMACS_INT nbytes
)
4587 EMACS_INT skip
, bm_skip
[256], last_char_skip
, infinity
, start
, start_max
;
4588 const unsigned char *p
;
4591 if (pure_bytes_used_non_lisp
< nbytes
+ 1)
4594 /* Set up the Boyer-Moore table. */
4596 for (i
= 0; i
< 256; i
++)
4599 p
= (const unsigned char *) data
;
4601 bm_skip
[*p
++] = skip
;
4603 last_char_skip
= bm_skip
['\0'];
4605 non_lisp_beg
= purebeg
+ pure_size
- pure_bytes_used_non_lisp
;
4606 start_max
= pure_bytes_used_non_lisp
- (nbytes
+ 1);
4608 /* See the comments in the function `boyer_moore' (search.c) for the
4609 use of `infinity'. */
4610 infinity
= pure_bytes_used_non_lisp
+ 1;
4611 bm_skip
['\0'] = infinity
;
4613 p
= (const unsigned char *) non_lisp_beg
+ nbytes
;
4617 /* Check the last character (== '\0'). */
4620 start
+= bm_skip
[*(p
+ start
)];
4622 while (start
<= start_max
);
4624 if (start
< infinity
)
4625 /* Couldn't find the last character. */
4628 /* No less than `infinity' means we could find the last
4629 character at `p[start - infinity]'. */
4632 /* Check the remaining characters. */
4633 if (memcmp (data
, non_lisp_beg
+ start
, nbytes
) == 0)
4635 return non_lisp_beg
+ start
;
4637 start
+= last_char_skip
;
4639 while (start
<= start_max
);
4645 /* Return a string allocated in pure space. DATA is a buffer holding
4646 NCHARS characters, and NBYTES bytes of string data. MULTIBYTE
4647 non-zero means make the result string multibyte.
4649 Must get an error if pure storage is full, since if it cannot hold
4650 a large string it may be able to hold conses that point to that
4651 string; then the string is not protected from gc. */
4654 make_pure_string (const char *data
,
4655 EMACS_INT nchars
, EMACS_INT nbytes
, int multibyte
)
4658 struct Lisp_String
*s
;
4660 s
= (struct Lisp_String
*) pure_alloc (sizeof *s
, Lisp_String
);
4661 s
->data
= (unsigned char *) find_string_data_in_pure (data
, nbytes
);
4662 if (s
->data
== NULL
)
4664 s
->data
= (unsigned char *) pure_alloc (nbytes
+ 1, -1);
4665 memcpy (s
->data
, data
, nbytes
);
4666 s
->data
[nbytes
] = '\0';
4669 s
->size_byte
= multibyte
? nbytes
: -1;
4670 s
->intervals
= NULL_INTERVAL
;
4671 XSETSTRING (string
, s
);
4675 /* Return a string a string allocated in pure space. Do not allocate
4676 the string data, just point to DATA. */
4679 make_pure_c_string (const char *data
)
4682 struct Lisp_String
*s
;
4683 EMACS_INT nchars
= strlen (data
);
4685 s
= (struct Lisp_String
*) pure_alloc (sizeof *s
, Lisp_String
);
4688 s
->data
= (unsigned char *) data
;
4689 s
->intervals
= NULL_INTERVAL
;
4690 XSETSTRING (string
, s
);
4694 /* Return a cons allocated from pure space. Give it pure copies
4695 of CAR as car and CDR as cdr. */
4698 pure_cons (Lisp_Object car
, Lisp_Object cdr
)
4700 register Lisp_Object
new;
4701 struct Lisp_Cons
*p
;
4703 p
= (struct Lisp_Cons
*) pure_alloc (sizeof *p
, Lisp_Cons
);
4705 XSETCAR (new, Fpurecopy (car
));
4706 XSETCDR (new, Fpurecopy (cdr
));
4711 /* Value is a float object with value NUM allocated from pure space. */
4714 make_pure_float (double num
)
4716 register Lisp_Object
new;
4717 struct Lisp_Float
*p
;
4719 p
= (struct Lisp_Float
*) pure_alloc (sizeof *p
, Lisp_Float
);
4721 XFLOAT_INIT (new, num
);
4726 /* Return a vector with room for LEN Lisp_Objects allocated from
4730 make_pure_vector (EMACS_INT len
)
4733 struct Lisp_Vector
*p
;
4734 size_t size
= sizeof *p
+ (len
- 1) * sizeof (Lisp_Object
);
4736 p
= (struct Lisp_Vector
*) pure_alloc (size
, Lisp_Vectorlike
);
4737 XSETVECTOR (new, p
);
4738 XVECTOR (new)->size
= len
;
4743 DEFUE ("purecopy", Fpurecopy
, Spurecopy
, 1, 1, 0,
4744 doc
: /* Make a copy of object OBJ in pure storage.
4745 Recursively copies contents of vectors and cons cells.
4746 Does not copy symbols. Copies strings without text properties. */)
4747 (register Lisp_Object obj
)
4749 if (NILP (Vpurify_flag
))
4752 if (PURE_POINTER_P (XPNTR (obj
)))
4755 if (HASH_TABLE_P (Vpurify_flag
)) /* Hash consing. */
4757 Lisp_Object tmp
= Fgethash (obj
, Vpurify_flag
, Qnil
);
4763 obj
= pure_cons (XCAR (obj
), XCDR (obj
));
4764 else if (FLOATP (obj
))
4765 obj
= make_pure_float (XFLOAT_DATA (obj
));
4766 else if (STRINGP (obj
))
4767 obj
= make_pure_string (SSDATA (obj
), SCHARS (obj
),
4769 STRING_MULTIBYTE (obj
));
4770 else if (COMPILEDP (obj
) || VECTORP (obj
))
4772 register struct Lisp_Vector
*vec
;
4773 register EMACS_INT i
;
4776 size
= XVECTOR (obj
)->size
;
4777 if (size
& PSEUDOVECTOR_FLAG
)
4778 size
&= PSEUDOVECTOR_SIZE_MASK
;
4779 vec
= XVECTOR (make_pure_vector (size
));
4780 for (i
= 0; i
< size
; i
++)
4781 vec
->contents
[i
] = Fpurecopy (XVECTOR (obj
)->contents
[i
]);
4782 if (COMPILEDP (obj
))
4784 XSETPVECTYPE (vec
, PVEC_COMPILED
);
4785 XSETCOMPILED (obj
, vec
);
4788 XSETVECTOR (obj
, vec
);
4790 else if (MARKERP (obj
))
4791 error ("Attempt to copy a marker to pure storage");
4793 /* Not purified, don't hash-cons. */
4796 if (HASH_TABLE_P (Vpurify_flag
)) /* Hash consing. */
4797 Fputhash (obj
, obj
, Vpurify_flag
);
4804 /***********************************************************************
4806 ***********************************************************************/
4808 /* Put an entry in staticvec, pointing at the variable with address
4812 staticpro (Lisp_Object
*varaddress
)
4814 staticvec
[staticidx
++] = varaddress
;
4815 if (staticidx
>= NSTATICS
)
4820 /***********************************************************************
4822 ***********************************************************************/
4824 /* Temporarily prevent garbage collection. */
4827 inhibit_garbage_collection (void)
4829 int count
= SPECPDL_INDEX ();
4830 int nbits
= min (VALBITS
, BITS_PER_INT
);
4832 specbind (Qgc_cons_threshold
, make_number (((EMACS_INT
) 1 << (nbits
- 1)) - 1));
4837 DEFUE ("garbage-collect", Fgarbage_collect
, Sgarbage_collect
, 0, 0, "",
4838 doc
: /* Reclaim storage for Lisp objects no longer needed.
4839 Garbage collection happens automatically if you cons more than
4840 `gc-cons-threshold' bytes of Lisp data since previous garbage collection.
4841 `garbage-collect' normally returns a list with info on amount of space in use:
4842 ((USED-CONSES . FREE-CONSES) (USED-SYMS . FREE-SYMS)
4843 (USED-MARKERS . FREE-MARKERS) USED-STRING-CHARS USED-VECTOR-SLOTS
4844 (USED-FLOATS . FREE-FLOATS) (USED-INTERVALS . FREE-INTERVALS)
4845 (USED-STRINGS . FREE-STRINGS))
4846 However, if there was overflow in pure space, `garbage-collect'
4847 returns nil, because real GC can't be done. */)
4850 register struct specbinding
*bind
;
4851 char stack_top_variable
;
4854 Lisp_Object total
[8];
4855 int count
= SPECPDL_INDEX ();
4856 EMACS_TIME t1
, t2
, t3
;
4861 /* Can't GC if pure storage overflowed because we can't determine
4862 if something is a pure object or not. */
4863 if (pure_bytes_used_before_overflow
)
4868 /* Don't keep undo information around forever.
4869 Do this early on, so it is no problem if the user quits. */
4871 register struct buffer
*nextb
= all_buffers
;
4875 /* If a buffer's undo list is Qt, that means that undo is
4876 turned off in that buffer. Calling truncate_undo_list on
4877 Qt tends to return NULL, which effectively turns undo back on.
4878 So don't call truncate_undo_list if undo_list is Qt. */
4879 if (! NILP (nextb
->BUFFER_INTERNAL_FIELD (name
)) && ! EQ (nextb
->BUFFER_INTERNAL_FIELD (undo_list
), Qt
))
4880 truncate_undo_list (nextb
);
4882 /* Shrink buffer gaps, but skip indirect and dead buffers. */
4883 if (nextb
->base_buffer
== 0 && !NILP (nextb
->BUFFER_INTERNAL_FIELD (name
))
4884 && ! nextb
->text
->inhibit_shrinking
)
4886 /* If a buffer's gap size is more than 10% of the buffer
4887 size, or larger than 2000 bytes, then shrink it
4888 accordingly. Keep a minimum size of 20 bytes. */
4889 int size
= min (2000, max (20, (nextb
->text
->z_byte
/ 10)));
4891 if (nextb
->text
->gap_size
> size
)
4893 struct buffer
*save_current
= current_buffer
;
4894 current_buffer
= nextb
;
4895 make_gap (-(nextb
->text
->gap_size
- size
));
4896 current_buffer
= save_current
;
4900 nextb
= nextb
->next
;
4904 EMACS_GET_TIME (t1
);
4906 /* In case user calls debug_print during GC,
4907 don't let that cause a recursive GC. */
4908 consing_since_gc
= 0;
4910 /* Save what's currently displayed in the echo area. */
4911 message_p
= push_message ();
4912 record_unwind_protect (pop_message_unwind
, Qnil
);
4914 /* Save a copy of the contents of the stack, for debugging. */
4915 #if MAX_SAVE_STACK > 0
4916 if (NILP (Vpurify_flag
))
4920 if (&stack_top_variable
< stack_bottom
)
4922 stack
= &stack_top_variable
;
4923 stack_size
= stack_bottom
- &stack_top_variable
;
4927 stack
= stack_bottom
;
4928 stack_size
= &stack_top_variable
- stack_bottom
;
4930 if (stack_size
<= MAX_SAVE_STACK
)
4932 if (stack_copy_size
< stack_size
)
4934 stack_copy
= (char *) xrealloc (stack_copy
, stack_size
);
4935 stack_copy_size
= stack_size
;
4937 memcpy (stack_copy
, stack
, stack_size
);
4940 #endif /* MAX_SAVE_STACK > 0 */
4942 if (garbage_collection_messages
)
4943 message1_nolog ("Garbage collecting...");
4947 shrink_regexp_cache ();
4951 /* clear_marks (); */
4953 /* Mark all the special slots that serve as the roots of accessibility. */
4955 for (i
= 0; i
< staticidx
; i
++)
4956 mark_object (*staticvec
[i
]);
4958 for (bind
= specpdl
; bind
!= specpdl_ptr
; bind
++)
4960 mark_object (bind
->symbol
);
4961 mark_object (bind
->old_value
);
4969 extern void xg_mark_data (void);
4974 #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \
4975 || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS)
4979 register struct gcpro
*tail
;
4980 for (tail
= gcprolist
; tail
; tail
= tail
->next
)
4981 for (i
= 0; i
< tail
->nvars
; i
++)
4982 mark_object (tail
->var
[i
]);
4986 struct catchtag
*catch;
4987 struct handler
*handler
;
4989 for (catch = catchlist
; catch; catch = catch->next
)
4991 mark_object (catch->tag
);
4992 mark_object (catch->val
);
4994 for (handler
= handlerlist
; handler
; handler
= handler
->next
)
4996 mark_object (handler
->handler
);
4997 mark_object (handler
->var
);
5003 #ifdef HAVE_WINDOW_SYSTEM
5004 mark_fringe_data ();
5007 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
5011 /* Everything is now marked, except for the things that require special
5012 finalization, i.e. the undo_list.
5013 Look thru every buffer's undo list
5014 for elements that update markers that were not marked,
5017 register struct buffer
*nextb
= all_buffers
;
5021 /* If a buffer's undo list is Qt, that means that undo is
5022 turned off in that buffer. Calling truncate_undo_list on
5023 Qt tends to return NULL, which effectively turns undo back on.
5024 So don't call truncate_undo_list if undo_list is Qt. */
5025 if (! EQ (nextb
->BUFFER_INTERNAL_FIELD (undo_list
), Qt
))
5027 Lisp_Object tail
, prev
;
5028 tail
= nextb
->BUFFER_INTERNAL_FIELD (undo_list
);
5030 while (CONSP (tail
))
5032 if (CONSP (XCAR (tail
))
5033 && MARKERP (XCAR (XCAR (tail
)))
5034 && !XMARKER (XCAR (XCAR (tail
)))->gcmarkbit
)
5037 nextb
->BUFFER_INTERNAL_FIELD (undo_list
) = tail
= XCDR (tail
);
5041 XSETCDR (prev
, tail
);
5051 /* Now that we have stripped the elements that need not be in the
5052 undo_list any more, we can finally mark the list. */
5053 mark_object (nextb
->BUFFER_INTERNAL_FIELD (undo_list
));
5055 nextb
= nextb
->next
;
5061 /* Clear the mark bits that we set in certain root slots. */
5063 unmark_byte_stack ();
5064 VECTOR_UNMARK (&buffer_defaults
);
5065 VECTOR_UNMARK (&buffer_local_symbols
);
5067 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES && 0
5075 /* clear_marks (); */
5078 consing_since_gc
= 0;
5079 if (gc_cons_threshold
< 10000)
5080 gc_cons_threshold
= 10000;
5082 if (FLOATP (Vgc_cons_percentage
))
5083 { /* Set gc_cons_combined_threshold. */
5086 tot
+= total_conses
* sizeof (struct Lisp_Cons
);
5087 tot
+= total_symbols
* sizeof (struct Lisp_Symbol
);
5088 tot
+= total_markers
* sizeof (union Lisp_Misc
);
5089 tot
+= total_string_size
;
5090 tot
+= total_vector_size
* sizeof (Lisp_Object
);
5091 tot
+= total_floats
* sizeof (struct Lisp_Float
);
5092 tot
+= total_intervals
* sizeof (struct interval
);
5093 tot
+= total_strings
* sizeof (struct Lisp_String
);
5095 gc_relative_threshold
= tot
* XFLOAT_DATA (Vgc_cons_percentage
);
5098 gc_relative_threshold
= 0;
5100 if (garbage_collection_messages
)
5102 if (message_p
|| minibuf_level
> 0)
5105 message1_nolog ("Garbage collecting...done");
5108 unbind_to (count
, Qnil
);
5110 total
[0] = Fcons (make_number (total_conses
),
5111 make_number (total_free_conses
));
5112 total
[1] = Fcons (make_number (total_symbols
),
5113 make_number (total_free_symbols
));
5114 total
[2] = Fcons (make_number (total_markers
),
5115 make_number (total_free_markers
));
5116 total
[3] = make_number (total_string_size
);
5117 total
[4] = make_number (total_vector_size
);
5118 total
[5] = Fcons (make_number (total_floats
),
5119 make_number (total_free_floats
));
5120 total
[6] = Fcons (make_number (total_intervals
),
5121 make_number (total_free_intervals
));
5122 total
[7] = Fcons (make_number (total_strings
),
5123 make_number (total_free_strings
));
5125 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
5127 /* Compute average percentage of zombies. */
5130 for (i
= 0; i
< 7; ++i
)
5131 if (CONSP (total
[i
]))
5132 nlive
+= XFASTINT (XCAR (total
[i
]));
5134 avg_live
= (avg_live
* ngcs
+ nlive
) / (ngcs
+ 1);
5135 max_live
= max (nlive
, max_live
);
5136 avg_zombies
= (avg_zombies
* ngcs
+ nzombies
) / (ngcs
+ 1);
5137 max_zombies
= max (nzombies
, max_zombies
);
5142 if (!NILP (Vpost_gc_hook
))
5144 int gc_count
= inhibit_garbage_collection ();
5145 safe_run_hooks (Qpost_gc_hook
);
5146 unbind_to (gc_count
, Qnil
);
5149 /* Accumulate statistics. */
5150 EMACS_GET_TIME (t2
);
5151 EMACS_SUB_TIME (t3
, t2
, t1
);
5152 if (FLOATP (Vgc_elapsed
))
5153 Vgc_elapsed
= make_float (XFLOAT_DATA (Vgc_elapsed
) +
5155 EMACS_USECS (t3
) * 1.0e-6);
5158 return Flist (sizeof total
/ sizeof *total
, total
);
5162 /* Mark Lisp objects in glyph matrix MATRIX. Currently the
5163 only interesting objects referenced from glyphs are strings. */
5166 mark_glyph_matrix (struct glyph_matrix
*matrix
)
5168 struct glyph_row
*row
= matrix
->rows
;
5169 struct glyph_row
*end
= row
+ matrix
->nrows
;
5171 for (; row
< end
; ++row
)
5175 for (area
= LEFT_MARGIN_AREA
; area
< LAST_AREA
; ++area
)
5177 struct glyph
*glyph
= row
->glyphs
[area
];
5178 struct glyph
*end_glyph
= glyph
+ row
->used
[area
];
5180 for (; glyph
< end_glyph
; ++glyph
)
5181 if (STRINGP (glyph
->object
)
5182 && !STRING_MARKED_P (XSTRING (glyph
->object
)))
5183 mark_object (glyph
->object
);
5189 /* Mark Lisp faces in the face cache C. */
5192 mark_face_cache (struct face_cache
*c
)
5197 for (i
= 0; i
< c
->used
; ++i
)
5199 struct face
*face
= FACE_FROM_ID (c
->f
, i
);
5203 for (j
= 0; j
< LFACE_VECTOR_SIZE
; ++j
)
5204 mark_object (face
->lface
[j
]);
5212 /* Mark reference to a Lisp_Object.
5213 If the object referred to has not been seen yet, recursively mark
5214 all the references contained in it. */
5216 #define LAST_MARKED_SIZE 500
5217 static Lisp_Object last_marked
[LAST_MARKED_SIZE
];
5218 int last_marked_index
;
5220 /* For debugging--call abort when we cdr down this many
5221 links of a list, in mark_object. In debugging,
5222 the call to abort will hit a breakpoint.
5223 Normally this is zero and the check never goes off. */
5224 static size_t mark_object_loop_halt
;
5227 mark_vectorlike (struct Lisp_Vector
*ptr
)
5229 register EMACS_UINT size
= ptr
->size
;
5230 register EMACS_UINT i
;
5232 eassert (!VECTOR_MARKED_P (ptr
));
5233 VECTOR_MARK (ptr
); /* Else mark it */
5234 if (size
& PSEUDOVECTOR_FLAG
)
5235 size
&= PSEUDOVECTOR_SIZE_MASK
;
5237 /* Note that this size is not the memory-footprint size, but only
5238 the number of Lisp_Object fields that we should trace.
5239 The distinction is used e.g. by Lisp_Process which places extra
5240 non-Lisp_Object fields at the end of the structure. */
5241 for (i
= 0; i
< size
; i
++) /* and then mark its elements */
5242 mark_object (ptr
->contents
[i
]);
5245 /* Like mark_vectorlike but optimized for char-tables (and
5246 sub-char-tables) assuming that the contents are mostly integers or
5250 mark_char_table (struct Lisp_Vector
*ptr
)
5252 register EMACS_UINT size
= ptr
->size
& PSEUDOVECTOR_SIZE_MASK
;
5253 register EMACS_UINT i
;
5255 eassert (!VECTOR_MARKED_P (ptr
));
5257 for (i
= 0; i
< size
; i
++)
5259 Lisp_Object val
= ptr
->contents
[i
];
5261 if (INTEGERP (val
) || (SYMBOLP (val
) && XSYMBOL (val
)->gcmarkbit
))
5263 if (SUB_CHAR_TABLE_P (val
))
5265 if (! VECTOR_MARKED_P (XVECTOR (val
)))
5266 mark_char_table (XVECTOR (val
));
5274 mark_object (Lisp_Object arg
)
5276 register Lisp_Object obj
= arg
;
5277 #ifdef GC_CHECK_MARKED_OBJECTS
5281 size_t cdr_count
= 0;
5285 if (PURE_POINTER_P (XPNTR (obj
)))
5288 last_marked
[last_marked_index
++] = obj
;
5289 if (last_marked_index
== LAST_MARKED_SIZE
)
5290 last_marked_index
= 0;
5292 /* Perform some sanity checks on the objects marked here. Abort if
5293 we encounter an object we know is bogus. This increases GC time
5294 by ~80%, and requires compilation with GC_MARK_STACK != 0. */
5295 #ifdef GC_CHECK_MARKED_OBJECTS
5297 po
= (void *) XPNTR (obj
);
5299 /* Check that the object pointed to by PO is known to be a Lisp
5300 structure allocated from the heap. */
5301 #define CHECK_ALLOCATED() \
5303 m = mem_find (po); \
5308 /* Check that the object pointed to by PO is live, using predicate
5310 #define CHECK_LIVE(LIVEP) \
5312 if (!LIVEP (m, po)) \
5316 /* Check both of the above conditions. */
5317 #define CHECK_ALLOCATED_AND_LIVE(LIVEP) \
5319 CHECK_ALLOCATED (); \
5320 CHECK_LIVE (LIVEP); \
5323 #else /* not GC_CHECK_MARKED_OBJECTS */
5325 #define CHECK_LIVE(LIVEP) (void) 0
5326 #define CHECK_ALLOCATED_AND_LIVE(LIVEP) (void) 0
5328 #endif /* not GC_CHECK_MARKED_OBJECTS */
5330 switch (SWITCH_ENUM_CAST (XTYPE (obj
)))
5334 register struct Lisp_String
*ptr
= XSTRING (obj
);
5335 if (STRING_MARKED_P (ptr
))
5337 CHECK_ALLOCATED_AND_LIVE (live_string_p
);
5338 MARK_INTERVAL_TREE (ptr
->intervals
);
5340 #ifdef GC_CHECK_STRING_BYTES
5341 /* Check that the string size recorded in the string is the
5342 same as the one recorded in the sdata structure. */
5343 CHECK_STRING_BYTES (ptr
);
5344 #endif /* GC_CHECK_STRING_BYTES */
5348 case Lisp_Vectorlike
:
5349 if (VECTOR_MARKED_P (XVECTOR (obj
)))
5351 #ifdef GC_CHECK_MARKED_OBJECTS
5353 if (m
== MEM_NIL
&& !SUBRP (obj
)
5354 && po
!= &buffer_defaults
5355 && po
!= &buffer_local_symbols
)
5357 #endif /* GC_CHECK_MARKED_OBJECTS */
5361 #ifdef GC_CHECK_MARKED_OBJECTS
5362 if (po
!= &buffer_defaults
&& po
!= &buffer_local_symbols
)
5365 for (b
= all_buffers
; b
&& b
!= po
; b
= b
->next
)
5370 #endif /* GC_CHECK_MARKED_OBJECTS */
5373 else if (SUBRP (obj
))
5375 else if (COMPILEDP (obj
))
5376 /* We could treat this just like a vector, but it is better to
5377 save the COMPILED_CONSTANTS element for last and avoid
5380 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
5381 register EMACS_UINT size
= ptr
->size
;
5382 register EMACS_UINT i
;
5384 CHECK_LIVE (live_vector_p
);
5385 VECTOR_MARK (ptr
); /* Else mark it */
5386 size
&= PSEUDOVECTOR_SIZE_MASK
;
5387 for (i
= 0; i
< size
; i
++) /* and then mark its elements */
5389 if (i
!= COMPILED_CONSTANTS
)
5390 mark_object (ptr
->contents
[i
]);
5392 obj
= ptr
->contents
[COMPILED_CONSTANTS
];
5395 else if (FRAMEP (obj
))
5397 register struct frame
*ptr
= XFRAME (obj
);
5398 mark_vectorlike (XVECTOR (obj
));
5399 mark_face_cache (ptr
->face_cache
);
5401 else if (WINDOWP (obj
))
5403 register struct Lisp_Vector
*ptr
= XVECTOR (obj
);
5404 struct window
*w
= XWINDOW (obj
);
5405 mark_vectorlike (ptr
);
5406 /* Mark glyphs for leaf windows. Marking window matrices is
5407 sufficient because frame matrices use the same glyph
5409 if (NILP (w
->hchild
)
5411 && w
->current_matrix
)
5413 mark_glyph_matrix (w
->current_matrix
);
5414 mark_glyph_matrix (w
->desired_matrix
);
5417 else if (HASH_TABLE_P (obj
))
5419 struct Lisp_Hash_Table
*h
= XHASH_TABLE (obj
);
5420 mark_vectorlike ((struct Lisp_Vector
*)h
);
5421 /* If hash table is not weak, mark all keys and values.
5422 For weak tables, mark only the vector. */
5424 mark_object (h
->key_and_value
);
5426 VECTOR_MARK (XVECTOR (h
->key_and_value
));
5428 else if (CHAR_TABLE_P (obj
))
5429 mark_char_table (XVECTOR (obj
));
5431 mark_vectorlike (XVECTOR (obj
));
5436 register struct Lisp_Symbol
*ptr
= XSYMBOL (obj
);
5437 struct Lisp_Symbol
*ptrx
;
5441 CHECK_ALLOCATED_AND_LIVE (live_symbol_p
);
5443 mark_object (ptr
->function
);
5444 mark_object (ptr
->plist
);
5445 switch (ptr
->redirect
)
5447 case SYMBOL_PLAINVAL
: mark_object (SYMBOL_VAL (ptr
)); break;
5448 case SYMBOL_VARALIAS
:
5451 XSETSYMBOL (tem
, SYMBOL_ALIAS (ptr
));
5455 case SYMBOL_LOCALIZED
:
5457 struct Lisp_Buffer_Local_Value
*blv
= SYMBOL_BLV (ptr
);
5458 /* If the value is forwarded to a buffer or keyboard field,
5459 these are marked when we see the corresponding object.
5460 And if it's forwarded to a C variable, either it's not
5461 a Lisp_Object var, or it's staticpro'd already. */
5462 mark_object (blv
->where
);
5463 mark_object (blv
->valcell
);
5464 mark_object (blv
->defcell
);
5467 case SYMBOL_FORWARDED
:
5468 /* If the value is forwarded to a buffer or keyboard field,
5469 these are marked when we see the corresponding object.
5470 And if it's forwarded to a C variable, either it's not
5471 a Lisp_Object var, or it's staticpro'd already. */
5475 if (!PURE_POINTER_P (XSTRING (ptr
->xname
)))
5476 MARK_STRING (XSTRING (ptr
->xname
));
5477 MARK_INTERVAL_TREE (STRING_INTERVALS (ptr
->xname
));
5482 ptrx
= ptr
; /* Use of ptrx avoids compiler bug on Sun */
5483 XSETSYMBOL (obj
, ptrx
);
5490 CHECK_ALLOCATED_AND_LIVE (live_misc_p
);
5491 if (XMISCANY (obj
)->gcmarkbit
)
5493 XMISCANY (obj
)->gcmarkbit
= 1;
5495 switch (XMISCTYPE (obj
))
5498 case Lisp_Misc_Marker
:
5499 /* DO NOT mark thru the marker's chain.
5500 The buffer's markers chain does not preserve markers from gc;
5501 instead, markers are removed from the chain when freed by gc. */
5504 case Lisp_Misc_Save_Value
:
5507 register struct Lisp_Save_Value
*ptr
= XSAVE_VALUE (obj
);
5508 /* If DOGC is set, POINTER is the address of a memory
5509 area containing INTEGER potential Lisp_Objects. */
5512 Lisp_Object
*p
= (Lisp_Object
*) ptr
->pointer
;
5514 for (nelt
= ptr
->integer
; nelt
> 0; nelt
--, p
++)
5515 mark_maybe_object (*p
);
5521 case Lisp_Misc_Overlay
:
5523 struct Lisp_Overlay
*ptr
= XOVERLAY (obj
);
5524 mark_object (ptr
->start
);
5525 mark_object (ptr
->end
);
5526 mark_object (ptr
->plist
);
5529 XSETMISC (obj
, ptr
->next
);
5542 register struct Lisp_Cons
*ptr
= XCONS (obj
);
5543 if (CONS_MARKED_P (ptr
))
5545 CHECK_ALLOCATED_AND_LIVE (live_cons_p
);
5547 /* If the cdr is nil, avoid recursion for the car. */
5548 if (EQ (ptr
->u
.cdr
, Qnil
))
5554 mark_object (ptr
->car
);
5557 if (cdr_count
== mark_object_loop_halt
)
5563 CHECK_ALLOCATED_AND_LIVE (live_float_p
);
5564 FLOAT_MARK (XFLOAT (obj
));
5575 #undef CHECK_ALLOCATED
5576 #undef CHECK_ALLOCATED_AND_LIVE
5579 /* Mark the pointers in a buffer structure. */
5582 mark_buffer (Lisp_Object buf
)
5584 register struct buffer
*buffer
= XBUFFER (buf
);
5585 register Lisp_Object
*ptr
, tmp
;
5586 Lisp_Object base_buffer
;
5588 eassert (!VECTOR_MARKED_P (buffer
));
5589 VECTOR_MARK (buffer
);
5591 MARK_INTERVAL_TREE (BUF_INTERVALS (buffer
));
5593 /* For now, we just don't mark the undo_list. It's done later in
5594 a special way just before the sweep phase, and after stripping
5595 some of its elements that are not needed any more. */
5597 if (buffer
->overlays_before
)
5599 XSETMISC (tmp
, buffer
->overlays_before
);
5602 if (buffer
->overlays_after
)
5604 XSETMISC (tmp
, buffer
->overlays_after
);
5608 /* buffer-local Lisp variables start at `undo_list',
5609 tho only the ones from `name' on are GC'd normally. */
5610 for (ptr
= &buffer
->BUFFER_INTERNAL_FIELD (name
);
5611 (char *)ptr
< (char *)buffer
+ sizeof (struct buffer
);
5615 /* If this is an indirect buffer, mark its base buffer. */
5616 if (buffer
->base_buffer
&& !VECTOR_MARKED_P (buffer
->base_buffer
))
5618 XSETBUFFER (base_buffer
, buffer
->base_buffer
);
5619 mark_buffer (base_buffer
);
5623 /* Mark the Lisp pointers in the terminal objects.
5624 Called by the Fgarbage_collector. */
5627 mark_terminals (void)
5630 for (t
= terminal_list
; t
; t
= t
->next_terminal
)
5632 eassert (t
->name
!= NULL
);
5633 #ifdef HAVE_WINDOW_SYSTEM
5634 /* If a terminal object is reachable from a stacpro'ed object,
5635 it might have been marked already. Make sure the image cache
5637 mark_image_cache (t
->image_cache
);
5638 #endif /* HAVE_WINDOW_SYSTEM */
5639 if (!VECTOR_MARKED_P (t
))
5640 mark_vectorlike ((struct Lisp_Vector
*)t
);
5646 /* Value is non-zero if OBJ will survive the current GC because it's
5647 either marked or does not need to be marked to survive. */
5650 survives_gc_p (Lisp_Object obj
)
5654 switch (XTYPE (obj
))
5661 survives_p
= XSYMBOL (obj
)->gcmarkbit
;
5665 survives_p
= XMISCANY (obj
)->gcmarkbit
;
5669 survives_p
= STRING_MARKED_P (XSTRING (obj
));
5672 case Lisp_Vectorlike
:
5673 survives_p
= SUBRP (obj
) || VECTOR_MARKED_P (XVECTOR (obj
));
5677 survives_p
= CONS_MARKED_P (XCONS (obj
));
5681 survives_p
= FLOAT_MARKED_P (XFLOAT (obj
));
5688 return survives_p
|| PURE_POINTER_P ((void *) XPNTR (obj
));
5693 /* Sweep: find all structures not marked, and free them. */
5698 /* Remove or mark entries in weak hash tables.
5699 This must be done before any object is unmarked. */
5700 sweep_weak_hash_tables ();
5703 #ifdef GC_CHECK_STRING_BYTES
5704 if (!noninteractive
)
5705 check_string_bytes (1);
5708 /* Put all unmarked conses on free list */
5710 register struct cons_block
*cblk
;
5711 struct cons_block
**cprev
= &cons_block
;
5712 register int lim
= cons_block_index
;
5713 register int num_free
= 0, num_used
= 0;
5717 for (cblk
= cons_block
; cblk
; cblk
= *cprev
)
5721 int ilim
= (lim
+ BITS_PER_INT
- 1) / BITS_PER_INT
;
5723 /* Scan the mark bits an int at a time. */
5724 for (i
= 0; i
<= ilim
; i
++)
5726 if (cblk
->gcmarkbits
[i
] == -1)
5728 /* Fast path - all cons cells for this int are marked. */
5729 cblk
->gcmarkbits
[i
] = 0;
5730 num_used
+= BITS_PER_INT
;
5734 /* Some cons cells for this int are not marked.
5735 Find which ones, and free them. */
5736 int start
, pos
, stop
;
5738 start
= i
* BITS_PER_INT
;
5740 if (stop
> BITS_PER_INT
)
5741 stop
= BITS_PER_INT
;
5744 for (pos
= start
; pos
< stop
; pos
++)
5746 if (!CONS_MARKED_P (&cblk
->conses
[pos
]))
5749 cblk
->conses
[pos
].u
.chain
= cons_free_list
;
5750 cons_free_list
= &cblk
->conses
[pos
];
5752 cons_free_list
->car
= Vdead
;
5758 CONS_UNMARK (&cblk
->conses
[pos
]);
5764 lim
= CONS_BLOCK_SIZE
;
5765 /* If this block contains only free conses and we have already
5766 seen more than two blocks worth of free conses then deallocate
5768 if (this_free
== CONS_BLOCK_SIZE
&& num_free
> CONS_BLOCK_SIZE
)
5770 *cprev
= cblk
->next
;
5771 /* Unhook from the free list. */
5772 cons_free_list
= cblk
->conses
[0].u
.chain
;
5773 lisp_align_free (cblk
);
5778 num_free
+= this_free
;
5779 cprev
= &cblk
->next
;
5782 total_conses
= num_used
;
5783 total_free_conses
= num_free
;
5786 /* Put all unmarked floats on free list */
5788 register struct float_block
*fblk
;
5789 struct float_block
**fprev
= &float_block
;
5790 register int lim
= float_block_index
;
5791 register int num_free
= 0, num_used
= 0;
5793 float_free_list
= 0;
5795 for (fblk
= float_block
; fblk
; fblk
= *fprev
)
5799 for (i
= 0; i
< lim
; i
++)
5800 if (!FLOAT_MARKED_P (&fblk
->floats
[i
]))
5803 fblk
->floats
[i
].u
.chain
= float_free_list
;
5804 float_free_list
= &fblk
->floats
[i
];
5809 FLOAT_UNMARK (&fblk
->floats
[i
]);
5811 lim
= FLOAT_BLOCK_SIZE
;
5812 /* If this block contains only free floats and we have already
5813 seen more than two blocks worth of free floats then deallocate
5815 if (this_free
== FLOAT_BLOCK_SIZE
&& num_free
> FLOAT_BLOCK_SIZE
)
5817 *fprev
= fblk
->next
;
5818 /* Unhook from the free list. */
5819 float_free_list
= fblk
->floats
[0].u
.chain
;
5820 lisp_align_free (fblk
);
5825 num_free
+= this_free
;
5826 fprev
= &fblk
->next
;
5829 total_floats
= num_used
;
5830 total_free_floats
= num_free
;
5833 /* Put all unmarked intervals on free list */
5835 register struct interval_block
*iblk
;
5836 struct interval_block
**iprev
= &interval_block
;
5837 register int lim
= interval_block_index
;
5838 register int num_free
= 0, num_used
= 0;
5840 interval_free_list
= 0;
5842 for (iblk
= interval_block
; iblk
; iblk
= *iprev
)
5847 for (i
= 0; i
< lim
; i
++)
5849 if (!iblk
->intervals
[i
].gcmarkbit
)
5851 SET_INTERVAL_PARENT (&iblk
->intervals
[i
], interval_free_list
);
5852 interval_free_list
= &iblk
->intervals
[i
];
5858 iblk
->intervals
[i
].gcmarkbit
= 0;
5861 lim
= INTERVAL_BLOCK_SIZE
;
5862 /* If this block contains only free intervals and we have already
5863 seen more than two blocks worth of free intervals then
5864 deallocate this block. */
5865 if (this_free
== INTERVAL_BLOCK_SIZE
&& num_free
> INTERVAL_BLOCK_SIZE
)
5867 *iprev
= iblk
->next
;
5868 /* Unhook from the free list. */
5869 interval_free_list
= INTERVAL_PARENT (&iblk
->intervals
[0]);
5871 n_interval_blocks
--;
5875 num_free
+= this_free
;
5876 iprev
= &iblk
->next
;
5879 total_intervals
= num_used
;
5880 total_free_intervals
= num_free
;
5883 /* Put all unmarked symbols on free list */
5885 register struct symbol_block
*sblk
;
5886 struct symbol_block
**sprev
= &symbol_block
;
5887 register int lim
= symbol_block_index
;
5888 register int num_free
= 0, num_used
= 0;
5890 symbol_free_list
= NULL
;
5892 for (sblk
= symbol_block
; sblk
; sblk
= *sprev
)
5895 struct Lisp_Symbol
*sym
= sblk
->symbols
;
5896 struct Lisp_Symbol
*end
= sym
+ lim
;
5898 for (; sym
< end
; ++sym
)
5900 /* Check if the symbol was created during loadup. In such a case
5901 it might be pointed to by pure bytecode which we don't trace,
5902 so we conservatively assume that it is live. */
5903 int pure_p
= PURE_POINTER_P (XSTRING (sym
->xname
));
5905 if (!sym
->gcmarkbit
&& !pure_p
)
5907 if (sym
->redirect
== SYMBOL_LOCALIZED
)
5908 xfree (SYMBOL_BLV (sym
));
5909 sym
->next
= symbol_free_list
;
5910 symbol_free_list
= sym
;
5912 symbol_free_list
->function
= Vdead
;
5920 UNMARK_STRING (XSTRING (sym
->xname
));
5925 lim
= SYMBOL_BLOCK_SIZE
;
5926 /* If this block contains only free symbols and we have already
5927 seen more than two blocks worth of free symbols then deallocate
5929 if (this_free
== SYMBOL_BLOCK_SIZE
&& num_free
> SYMBOL_BLOCK_SIZE
)
5931 *sprev
= sblk
->next
;
5932 /* Unhook from the free list. */
5933 symbol_free_list
= sblk
->symbols
[0].next
;
5939 num_free
+= this_free
;
5940 sprev
= &sblk
->next
;
5943 total_symbols
= num_used
;
5944 total_free_symbols
= num_free
;
5947 /* Put all unmarked misc's on free list.
5948 For a marker, first unchain it from the buffer it points into. */
5950 register struct marker_block
*mblk
;
5951 struct marker_block
**mprev
= &marker_block
;
5952 register int lim
= marker_block_index
;
5953 register int num_free
= 0, num_used
= 0;
5955 marker_free_list
= 0;
5957 for (mblk
= marker_block
; mblk
; mblk
= *mprev
)
5962 for (i
= 0; i
< lim
; i
++)
5964 if (!mblk
->markers
[i
].u_any
.gcmarkbit
)
5966 if (mblk
->markers
[i
].u_any
.type
== Lisp_Misc_Marker
)
5967 unchain_marker (&mblk
->markers
[i
].u_marker
);
5968 /* Set the type of the freed object to Lisp_Misc_Free.
5969 We could leave the type alone, since nobody checks it,
5970 but this might catch bugs faster. */
5971 mblk
->markers
[i
].u_marker
.type
= Lisp_Misc_Free
;
5972 mblk
->markers
[i
].u_free
.chain
= marker_free_list
;
5973 marker_free_list
= &mblk
->markers
[i
];
5979 mblk
->markers
[i
].u_any
.gcmarkbit
= 0;
5982 lim
= MARKER_BLOCK_SIZE
;
5983 /* If this block contains only free markers and we have already
5984 seen more than two blocks worth of free markers then deallocate
5986 if (this_free
== MARKER_BLOCK_SIZE
&& num_free
> MARKER_BLOCK_SIZE
)
5988 *mprev
= mblk
->next
;
5989 /* Unhook from the free list. */
5990 marker_free_list
= mblk
->markers
[0].u_free
.chain
;
5996 num_free
+= this_free
;
5997 mprev
= &mblk
->next
;
6001 total_markers
= num_used
;
6002 total_free_markers
= num_free
;
6005 /* Free all unmarked buffers */
6007 register struct buffer
*buffer
= all_buffers
, *prev
= 0, *next
;
6010 if (!VECTOR_MARKED_P (buffer
))
6013 prev
->next
= buffer
->next
;
6015 all_buffers
= buffer
->next
;
6016 next
= buffer
->next
;
6022 VECTOR_UNMARK (buffer
);
6023 UNMARK_BALANCE_INTERVALS (BUF_INTERVALS (buffer
));
6024 prev
= buffer
, buffer
= buffer
->next
;
6028 /* Free all unmarked vectors */
6030 register struct Lisp_Vector
*vector
= all_vectors
, *prev
= 0, *next
;
6031 total_vector_size
= 0;
6034 if (!VECTOR_MARKED_P (vector
))
6037 prev
->next
= vector
->next
;
6039 all_vectors
= vector
->next
;
6040 next
= vector
->next
;
6048 VECTOR_UNMARK (vector
);
6049 if (vector
->size
& PSEUDOVECTOR_FLAG
)
6050 total_vector_size
+= (PSEUDOVECTOR_SIZE_MASK
& vector
->size
);
6052 total_vector_size
+= vector
->size
;
6053 prev
= vector
, vector
= vector
->next
;
6057 #ifdef GC_CHECK_STRING_BYTES
6058 if (!noninteractive
)
6059 check_string_bytes (1);
6066 /* Debugging aids. */
6068 DEFUN ("memory-limit", Fmemory_limit
, Smemory_limit
, 0, 0, 0,
6069 doc
: /* Return the address of the last byte Emacs has allocated, divided by 1024.
6070 This may be helpful in debugging Emacs's memory usage.
6071 We divide the value by 1024 to make sure it fits in a Lisp integer. */)
6076 XSETINT (end
, (EMACS_INT
) (char *) sbrk (0) / 1024);
6081 DEFUN ("memory-use-counts", Fmemory_use_counts
, Smemory_use_counts
, 0, 0, 0,
6082 doc
: /* Return a list of counters that measure how much consing there has been.
6083 Each of these counters increments for a certain kind of object.
6084 The counters wrap around from the largest positive integer to zero.
6085 Garbage collection does not decrease them.
6086 The elements of the value are as follows:
6087 (CONSES FLOATS VECTOR-CELLS SYMBOLS STRING-CHARS MISCS INTERVALS STRINGS)
6088 All are in units of 1 = one object consed
6089 except for VECTOR-CELLS and STRING-CHARS, which count the total length of
6091 MISCS include overlays, markers, and some internal types.
6092 Frames, windows, buffers, and subprocesses count as vectors
6093 (but the contents of a buffer's text do not count here). */)
6096 Lisp_Object consed
[8];
6098 consed
[0] = make_number (min (MOST_POSITIVE_FIXNUM
, cons_cells_consed
));
6099 consed
[1] = make_number (min (MOST_POSITIVE_FIXNUM
, floats_consed
));
6100 consed
[2] = make_number (min (MOST_POSITIVE_FIXNUM
, vector_cells_consed
));
6101 consed
[3] = make_number (min (MOST_POSITIVE_FIXNUM
, symbols_consed
));
6102 consed
[4] = make_number (min (MOST_POSITIVE_FIXNUM
, string_chars_consed
));
6103 consed
[5] = make_number (min (MOST_POSITIVE_FIXNUM
, misc_objects_consed
));
6104 consed
[6] = make_number (min (MOST_POSITIVE_FIXNUM
, intervals_consed
));
6105 consed
[7] = make_number (min (MOST_POSITIVE_FIXNUM
, strings_consed
));
6107 return Flist (8, consed
);
6110 int suppress_checking
;
6113 die (const char *msg
, const char *file
, int line
)
6115 fprintf (stderr
, "\r\n%s:%d: Emacs fatal error: %s\r\n",
6120 /* Initialization */
6123 init_alloc_once (void)
6125 /* Used to do Vpurify_flag = Qt here, but Qt isn't set up yet! */
6127 pure_size
= PURESIZE
;
6128 pure_bytes_used
= 0;
6129 pure_bytes_used_lisp
= pure_bytes_used_non_lisp
= 0;
6130 pure_bytes_used_before_overflow
= 0;
6132 /* Initialize the list of free aligned blocks. */
6135 #if GC_MARK_STACK || defined GC_MALLOC_CHECK
6137 Vdead
= make_pure_string ("DEAD", 4, 4, 0);
6141 ignore_warnings
= 1;
6142 #ifdef DOUG_LEA_MALLOC
6143 mallopt (M_TRIM_THRESHOLD
, 128*1024); /* trim threshold */
6144 mallopt (M_MMAP_THRESHOLD
, 64*1024); /* mmap threshold */
6145 mallopt (M_MMAP_MAX
, MMAP_MAX_AREAS
); /* max. number of mmap'ed areas */
6153 init_weak_hash_tables ();
6156 malloc_hysteresis
= 32;
6158 malloc_hysteresis
= 0;
6161 refill_memory_reserve ();
6163 ignore_warnings
= 0;
6165 byte_stack_list
= 0;
6167 consing_since_gc
= 0;
6168 gc_cons_threshold
= 100000 * sizeof (Lisp_Object
);
6169 gc_relative_threshold
= 0;
6176 byte_stack_list
= 0;
6178 #if !defined GC_SAVE_REGISTERS_ON_STACK && !defined GC_SETJMP_WORKS
6179 setjmp_tested_p
= longjmps_done
= 0;
6182 Vgc_elapsed
= make_float (0.0);
6187 syms_of_alloc (void)
6189 DEFVAR_INT ("gc-cons-threshold", gc_cons_threshold
,
6190 doc
: /* *Number of bytes of consing between garbage collections.
6191 Garbage collection can happen automatically once this many bytes have been
6192 allocated since the last garbage collection. All data types count.
6194 Garbage collection happens automatically only when `eval' is called.
6196 By binding this temporarily to a large number, you can effectively
6197 prevent garbage collection during a part of the program.
6198 See also `gc-cons-percentage'. */);
6200 DEFVAR_LISP ("gc-cons-percentage", Vgc_cons_percentage
,
6201 doc
: /* *Portion of the heap used for allocation.
6202 Garbage collection can happen automatically once this portion of the heap
6203 has been allocated since the last garbage collection.
6204 If this portion is smaller than `gc-cons-threshold', this is ignored. */);
6205 Vgc_cons_percentage
= make_float (0.1);
6207 DEFVAR_INT ("pure-bytes-used", pure_bytes_used
,
6208 doc
: /* Number of bytes of sharable Lisp data allocated so far. */);
6210 DEFVAR_INT ("cons-cells-consed", cons_cells_consed
,
6211 doc
: /* Number of cons cells that have been consed so far. */);
6213 DEFVAR_INT ("floats-consed", floats_consed
,
6214 doc
: /* Number of floats that have been consed so far. */);
6216 DEFVAR_INT ("vector-cells-consed", vector_cells_consed
,
6217 doc
: /* Number of vector cells that have been consed so far. */);
6219 DEFVAR_INT ("symbols-consed", symbols_consed
,
6220 doc
: /* Number of symbols that have been consed so far. */);
6222 DEFVAR_INT ("string-chars-consed", string_chars_consed
,
6223 doc
: /* Number of string characters that have been consed so far. */);
6225 DEFVAR_INT ("misc-objects-consed", misc_objects_consed
,
6226 doc
: /* Number of miscellaneous objects that have been consed so far. */);
6228 DEFVAR_INT ("intervals-consed", intervals_consed
,
6229 doc
: /* Number of intervals that have been consed so far. */);
6231 DEFVAR_INT ("strings-consed", strings_consed
,
6232 doc
: /* Number of strings that have been consed so far. */);
6234 DEFVAR_LISP ("purify-flag", Vpurify_flag
,
6235 doc
: /* Non-nil means loading Lisp code in order to dump an executable.
6236 This means that certain objects should be allocated in shared (pure) space.
6237 It can also be set to a hash-table, in which case this table is used to
6238 do hash-consing of the objects allocated to pure space. */);
6240 DEFVAR_BOOL ("garbage-collection-messages", garbage_collection_messages
,
6241 doc
: /* Non-nil means display messages at start and end of garbage collection. */);
6242 garbage_collection_messages
= 0;
6244 DEFVAR_LISP ("post-gc-hook", Vpost_gc_hook
,
6245 doc
: /* Hook run after garbage collection has finished. */);
6246 Vpost_gc_hook
= Qnil
;
6247 Qpost_gc_hook
= intern_c_string ("post-gc-hook");
6248 staticpro (&Qpost_gc_hook
);
6250 DEFVAR_LISP ("memory-signal-data", Vmemory_signal_data
,
6251 doc
: /* Precomputed `signal' argument for memory-full error. */);
6252 /* We build this in advance because if we wait until we need it, we might
6253 not be able to allocate the memory to hold it. */
6255 = pure_cons (Qerror
,
6256 pure_cons (make_pure_c_string ("Memory exhausted--use M-x save-some-buffers then exit and restart Emacs"), Qnil
));
6258 DEFVAR_LISP ("memory-full", Vmemory_full
,
6259 doc
: /* Non-nil means Emacs cannot get much more Lisp memory. */);
6260 Vmemory_full
= Qnil
;
6262 staticpro (&Qgc_cons_threshold
);
6263 Qgc_cons_threshold
= intern_c_string ("gc-cons-threshold");
6265 staticpro (&Qchar_table_extra_slots
);
6266 Qchar_table_extra_slots
= intern_c_string ("char-table-extra-slots");
6268 DEFVAR_LISP ("gc-elapsed", Vgc_elapsed
,
6269 doc
: /* Accumulated time elapsed in garbage collections.
6270 The time is in seconds as a floating point value. */);
6271 DEFVAR_INT ("gcs-done", gcs_done
,
6272 doc
: /* Accumulated number of garbage collections done. */);
6277 defsubr (&Smake_byte_code
);
6278 defsubr (&Smake_list
);
6279 defsubr (&Smake_vector
);
6280 defsubr (&Smake_string
);
6281 defsubr (&Smake_bool_vector
);
6282 defsubr (&Smake_symbol
);
6283 defsubr (&Smake_marker
);
6284 defsubr (&Spurecopy
);
6285 defsubr (&Sgarbage_collect
);
6286 defsubr (&Smemory_limit
);
6287 defsubr (&Smemory_use_counts
);
6289 #if GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
6290 defsubr (&Sgc_status
);