summaryrefslogtreecommitdiff
path: root/malloc/malloc.c
diff options
context:
space:
mode:
Diffstat (limited to 'malloc/malloc.c')
-rw-r--r--malloc/malloc.c598
1 files changed, 501 insertions, 97 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 8b99da9f28..c2a94a4f8d 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -19,7 +19,7 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-/* VERSION 2.6.4-pt Wed Dec 4 00:35:54 MET 1996
+/* V2.6.4-pt2 Sat Dec 14 1996
This work is mainly derived from malloc-2.6.4 by Doug Lea
<dl@cs.oswego.edu>, which is available from:
@@ -52,8 +52,8 @@
ptmalloc_init();
Initialize global configuration. When compiled for multiple threads,
this function must be called once before any other function in the
- package. It is not required otherwise. It is called automatically
- in the Linux/GNU C libray.
+ package. It is not required otherwise. It is called automatically
+ in the Linux/GNU C libray or when compiling with MALLOC_HOOKS.
malloc(size_t n);
Return a pointer to a newly allocated chunk of at least n bytes, or null
if no space is available.
@@ -154,7 +154,6 @@
Here are some features that are NOT currently supported
- * No user-definable hooks for callbacks and the like.
* No automated mechanism for fully checking that all accesses
to malloced memory stay within their bounds.
* No support for compaction.
@@ -180,6 +179,9 @@
Define to enable debugging. Adds fairly extensive assertion-based
checking to help track down memory errors, but noticeably slows down
execution.
+ MALLOC_HOOKS (default: NOT defined)
+ Define to enable support run-time replacement of the allocation
+ functions through user-defined `hooks'.
REALLOC_ZERO_BYTES_FREES (default: NOT defined)
Define this if you think that realloc(p, 0) should be equivalent
to free(p). Otherwise, since malloc returns a unique pointer for
@@ -234,6 +236,10 @@
These values may also be changed dynamically via mallopt(). The
preset defaults are those that give best performance for typical
programs/systems.
+ DEFAULT_CHECK_ACTION
+ When the standard debugging hooks are in place, and a pointer is
+ detected as corrupt, do nothing (0), print an error message (1),
+ or call abort() (2).
*/
@@ -290,9 +296,12 @@
#endif /*Void_t*/
#if __STD_C
-#include <stddef.h> /* for size_t */
+# include <stddef.h> /* for size_t */
+# if defined(_LIBC) || defined(MALLOC_HOOKS)
+# include <stdlib.h> /* for getenv() */
+# endif
#else
-#include <sys/types.h>
+# include <sys/types.h>
#endif
/* Macros for handling mutexes and thread-specific data. This is
@@ -306,6 +315,13 @@ extern "C" {
#include <stdio.h> /* needed for malloc_stats */
+/* We must not pollute the name space in the GNU libc. */
+#ifdef _LIBC
+#define malloc_stats __malloc_stats
+#define malloc_usable_size __malloc_usable_size
+#define malloc_trim __malloc_trim
+#endif
+
/*
Compile-time options
@@ -380,7 +396,7 @@ extern "C" {
*/
-#define HAVE_MEMCPY
+#define HAVE_MEMCPY 1
#ifndef USE_MEMCPY
#ifdef HAVE_MEMCPY
@@ -768,6 +784,16 @@ do { \
+#ifndef DEFAULT_CHECK_ACTION
+#define DEFAULT_CHECK_ACTION 1
+#endif
+
+/* What to do if the standard debugging hooks are in place and a
+ corrupt pointer is detected: do nothing (0), print an error message
+ (1), or call abort() (2). */
+
+
+
#define HEAP_MIN_SIZE (32*1024)
#define HEAP_MAX_SIZE (1024*1024) /* must be a power of two */
@@ -813,6 +839,11 @@ static Void_t *(*__morecore)() = __default_morecore;
#define MORECORE (*__morecore)
#define MORECORE_FAILURE 0
#define MORECORE_CLEARS 1
+#define mmap __mmap
+#define munmap __munmap
+#define mremap __mremap
+#undef malloc_getpagesize
+#define malloc_getpagesize __getpagesize()
#else /* _LIBC */
@@ -836,7 +867,7 @@ extern Void_t* sbrk();
#endif /* _LIBC */
-#if 0 && defined(_LIBC)
+#ifdef _LIBC
#define cALLOc __libc_calloc
#define fREe __libc_free
@@ -848,17 +879,6 @@ extern Void_t* sbrk();
#define mALLINFo __libc_mallinfo
#define mALLOPt __libc_mallopt
-#pragma weak calloc = __libc_calloc
-#pragma weak free = __libc_free
-#pragma weak cfree = __libc_free
-#pragma weak malloc = __libc_malloc
-#pragma weak memalign = __libc_memalign
-#pragma weak realloc = __libc_realloc
-#pragma weak valloc = __libc_valloc
-#pragma weak pvalloc = __libc_pvalloc
-#pragma weak mallinfo = __libc_mallinfo
-#pragma weak mallopt = __libc_mallopt
-
#else
#define cALLOc calloc
@@ -888,8 +908,11 @@ Void_t* vALLOc(size_t);
Void_t* pvALLOc(size_t);
Void_t* cALLOc(size_t, size_t);
void cfree(Void_t*);
+int __malloc_trim(size_t);
int malloc_trim(size_t);
+size_t __malloc_usable_size(Void_t*);
size_t malloc_usable_size(Void_t*);
+void __malloc_stats(void);
void malloc_stats(void);
int mALLOPt(int, int);
struct mallinfo mALLINFo(void);
@@ -905,8 +928,11 @@ Void_t* vALLOc();
Void_t* pvALLOc();
Void_t* cALLOc();
void cfree();
+int __malloc_trim();
int malloc_trim();
+size_t _malloc_usable_size();
size_t malloc_usable_size();
+void __malloc_stats();
void malloc_stats();
int mALLOPt();
struct mallinfo mALLINFo();
@@ -1136,19 +1162,41 @@ typedef struct _heap_info {
*/
#if __STD_C
+
static void chunk_free(arena *ar_ptr, mchunkptr p);
static mchunkptr chunk_alloc(arena *ar_ptr, INTERNAL_SIZE_T size);
+static mchunkptr chunk_realloc(arena *ar_ptr, mchunkptr oldp,
+ INTERNAL_SIZE_T oldsize, INTERNAL_SIZE_T nb);
+static mchunkptr chunk_align(arena *ar_ptr, INTERNAL_SIZE_T nb,
+ size_t alignment);
static int main_trim(size_t pad);
#ifndef NO_THREADS
static int heap_trim(heap_info *heap, size_t pad);
#endif
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+static Void_t* malloc_check(size_t sz);
+static void free_check(Void_t* mem);
+static Void_t* realloc_check(Void_t* oldmem, size_t bytes);
+static Void_t* memalign_check(size_t alignment, size_t bytes);
+#endif
+
#else
+
static void chunk_free();
static mchunkptr chunk_alloc();
+static mchunkptr chunk_realloc();
+static mchunkptr chunk_align();
static int main_trim();
#ifndef NO_THREADS
static int heap_trim();
#endif
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+static Void_t* malloc_check();
+static void free_check();
+static Void_t* realloc_check();
+static Void_t* memalign_check();
+#endif
+
#endif
@@ -1416,6 +1464,7 @@ static unsigned long trim_threshold = DEFAULT_TRIM_THRESHOLD;
static unsigned long top_pad = DEFAULT_TOP_PAD;
static unsigned int n_mmaps_max = DEFAULT_MMAP_MAX;
static unsigned long mmap_threshold = DEFAULT_MMAP_THRESHOLD;
+static int check_action = DEFAULT_CHECK_ACTION;
/* The first value returned from sbrk */
static char* sbrk_base = (char*)(-1);
@@ -1444,7 +1493,9 @@ static unsigned long max_mmapped_mem = 0;
/* Initialization routine. */
#if defined(_LIBC)
+#if 0
static void ptmalloc_init __MALLOC_P ((void)) __attribute__ ((constructor));
+#endif
static void
ptmalloc_init __MALLOC_P((void))
@@ -1454,24 +1505,103 @@ ptmalloc_init __MALLOC_P((void))
#endif
{
static int first = 1;
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+ const char* s;
+#endif
+ if(!first) return;
+ first = 0;
#if defined(_LIBC)
/* Initialize the pthreads interface. */
if (__pthread_initialize != NULL)
__pthread_initialize();
#endif
-
- if(first) {
- first = 0;
#ifndef NO_THREADS
- mutex_init(&main_arena.mutex);
- mutex_init(&list_lock);
- tsd_key_create(&arena_key, NULL);
- tsd_setspecific(arena_key, (Void_t *)&main_arena);
-#endif
+ mutex_init(&main_arena.mutex);
+ mutex_init(&list_lock);
+ tsd_key_create(&arena_key, NULL);
+ tsd_setspecific(arena_key, (Void_t *)&main_arena);
+#endif
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+ s = getenv("MALLOC_CHECK_");
+ if(s) {
+ if(s[0]) mallopt(M_CHECK_ACTION, (int)(s[0] - '0'));
+ malloc_check_init();
}
+ if(__malloc_initialize_hook != NULL)
+ (*__malloc_initialize_hook)();
+#endif
}
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+
+/* Hooks for debugging versions. The initial hooks just call the
+ initialization routine, then do the normal work. */
+
+static Void_t*
+#if __STD_C
+malloc_hook_ini(size_t sz)
+#else
+malloc_hook_ini(sz) size_t sz;
+#endif
+{
+ __malloc_hook = NULL;
+ __realloc_hook = NULL;
+ __memalign_hook = NULL;
+ ptmalloc_init();
+ return mALLOc(sz);
+}
+
+static Void_t*
+#if __STD_C
+realloc_hook_ini(Void_t* ptr, size_t sz)
+#else
+realloc_hook_ini(ptr, sz) Void_t* ptr; size_t sz;
+#endif
+{
+ __malloc_hook = NULL;
+ __realloc_hook = NULL;
+ __memalign_hook = NULL;
+ ptmalloc_init();
+ return rEALLOc(ptr, sz);
+}
+
+static Void_t*
+#if __STD_C
+memalign_hook_ini(size_t sz, size_t alignment)
+#else
+memalign_hook_ini(sz, alignment) size_t sz; size_t alignment;
+#endif
+{
+ __malloc_hook = NULL;
+ __realloc_hook = NULL;
+ __memalign_hook = NULL;
+ ptmalloc_init();
+ return mEMALIGn(sz, alignment);
+}
+
+void (*__malloc_initialize_hook) __MALLOC_P ((void)) = NULL;
+void (*__free_hook) __MALLOC_P ((__malloc_ptr_t __ptr)) = NULL;
+__malloc_ptr_t (*__malloc_hook)
+ __MALLOC_P ((size_t __size)) = malloc_hook_ini;
+__malloc_ptr_t (*__realloc_hook)
+ __MALLOC_P ((__malloc_ptr_t __ptr, size_t __size)) = realloc_hook_ini;
+__malloc_ptr_t (*__memalign_hook)
+ __MALLOC_P ((size_t __size, size_t __alignment)) = memalign_hook_ini;
+
+/* Activate a standard set of debugging hooks. */
+void
+malloc_check_init()
+{
+ __malloc_hook = malloc_check;
+ __free_hook = free_check;
+ __realloc_hook = realloc_check;
+ __memalign_hook = memalign_check;
+ fprintf(stderr, "Using debugging hooks\n");
+}
+
+#endif
+
@@ -2224,9 +2354,19 @@ Void_t* mALLOc(bytes) size_t bytes;
#endif
{
arena *ar_ptr;
- INTERNAL_SIZE_T nb = request2size(bytes); /* padded request size; */
+ INTERNAL_SIZE_T nb; /* padded request size */
mchunkptr victim;
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+ if (__malloc_hook != NULL) {
+ Void_t* result;
+
+ result = (*__malloc_hook)(bytes);
+ return result;
+ }
+#endif
+
+ nb = request2size(bytes);
arena_get(ar_ptr, nb + top_pad);
if(!ar_ptr)
return 0;
@@ -2501,6 +2641,13 @@ void fREe(mem) Void_t* mem;
arena *ar_ptr;
mchunkptr p; /* chunk corresponding to mem */
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+ if (__free_hook != NULL) {
+ (*__free_hook)(mem);
+ return;
+ }
+#endif
+
if (mem == 0) /* free(0) has no effect */
return;
@@ -2676,38 +2823,33 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
INTERNAL_SIZE_T oldsize; /* its size */
mchunkptr newp; /* chunk to return */
- INTERNAL_SIZE_T newsize; /* its size */
- Void_t* newmem; /* corresponding user mem */
-
- mchunkptr next; /* next contiguous chunk after oldp */
- INTERNAL_SIZE_T nextsize; /* its size */
- mchunkptr prev; /* previous contiguous chunk before oldp */
- INTERNAL_SIZE_T prevsize; /* its size */
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+ if (__realloc_hook != NULL) {
+ Void_t* result;
- mchunkptr remainder; /* holds split off extra space from newp */
- INTERNAL_SIZE_T remainder_size; /* its size */
-
- mchunkptr bck; /* misc temp for linking */
- mchunkptr fwd; /* misc temp for linking */
+ result = (*__realloc_hook)(oldmem, bytes);
+ return result;
+ }
+#endif
#ifdef REALLOC_ZERO_BYTES_FREES
if (bytes == 0) { fREe(oldmem); return 0; }
#endif
-
/* realloc of null is supposed to be same as malloc */
if (oldmem == 0) return mALLOc(bytes);
- newp = oldp = mem2chunk(oldmem);
- newsize = oldsize = chunksize(oldp);
-
+ oldp = mem2chunk(oldmem);
+ oldsize = chunksize(oldp);
nb = request2size(bytes);
#if HAVE_MMAP
if (chunk_is_mmapped(oldp))
{
+ Void_t* newmem;
+
#if HAVE_MREMAP
newp = mremap_chunk(oldp, nb);
if(newp) return chunk2mem(newp);
@@ -2738,6 +2880,36 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
/* As in malloc(), remember this arena for the next allocation. */
tsd_setspecific(arena_key, (Void_t *)ar_ptr);
+ newp = chunk_realloc(ar_ptr, oldp, oldsize, nb);
+
+ (void)mutex_unlock(&ar_ptr->mutex);
+ return newp ? chunk2mem(newp) : NULL;
+}
+
+static mchunkptr
+#if __STD_C
+chunk_realloc(arena* ar_ptr, mchunkptr oldp, INTERNAL_SIZE_T oldsize,
+ INTERNAL_SIZE_T nb)
+#else
+chunk_realloc(ar_ptr, oldp, oldsize, nb)
+arena* ar_ptr; mchunkptr oldp; INTERNAL_SIZE_T oldsize, nb;
+#endif
+{
+ mchunkptr newp = oldp; /* chunk to return */
+ INTERNAL_SIZE_T newsize = oldsize; /* its size */
+
+ mchunkptr next; /* next contiguous chunk after oldp */
+ INTERNAL_SIZE_T nextsize; /* its size */
+
+ mchunkptr prev; /* previous contiguous chunk before oldp */
+ INTERNAL_SIZE_T prevsize; /* its size */
+
+ mchunkptr remainder; /* holds split off extra space from newp */
+ INTERNAL_SIZE_T remainder_size; /* its size */
+
+ mchunkptr bck; /* misc temp for linking */
+ mchunkptr fwd; /* misc temp for linking */
+
check_inuse_chunk(ar_ptr, oldp);
if ((long)(oldsize) < (long)(nb))
@@ -2759,8 +2931,7 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
top(ar_ptr) = chunk_at_offset(oldp, nb);
set_head(top(ar_ptr), (newsize - nb) | PREV_INUSE);
set_head_size(oldp, nb);
- (void)mutex_unlock(&ar_ptr->mutex);
- return chunk2mem(oldp);
+ return oldp;
}
}
@@ -2797,13 +2968,11 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
unlink(prev, bck, fwd);
newp = prev;
newsize += prevsize + nextsize;
- newmem = chunk2mem(newp);
- MALLOC_COPY(newmem, oldmem, oldsize - SIZE_SZ);
+ MALLOC_COPY(chunk2mem(newp), chunk2mem(oldp), oldsize - SIZE_SZ);
top(ar_ptr) = chunk_at_offset(newp, nb);
set_head(top(ar_ptr), (newsize - nb) | PREV_INUSE);
set_head_size(newp, nb);
- (void)mutex_unlock(&ar_ptr->mutex);
- return newmem;
+ return newp;
}
}
@@ -2814,8 +2983,7 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
unlink(prev, bck, fwd);
newp = prev;
newsize += nextsize + prevsize;
- newmem = chunk2mem(newp);
- MALLOC_COPY(newmem, oldmem, oldsize - SIZE_SZ);
+ MALLOC_COPY(chunk2mem(newp), chunk2mem(oldp), oldsize - SIZE_SZ);
goto split;
}
}
@@ -2826,8 +2994,7 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
unlink(prev, bck, fwd);
newp = prev;
newsize += prevsize;
- newmem = chunk2mem(newp);
- MALLOC_COPY(newmem, oldmem, oldsize - SIZE_SZ);
+ MALLOC_COPY(chunk2mem(newp), chunk2mem(oldp), oldsize - SIZE_SZ);
goto split;
}
}
@@ -2850,11 +3017,9 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
}
/* Otherwise copy, free, and exit */
- newmem = chunk2mem(newp);
- MALLOC_COPY(newmem, oldmem, oldsize - SIZE_SZ);
+ MALLOC_COPY(chunk2mem(newp), chunk2mem(oldp), oldsize - SIZE_SZ);
chunk_free(ar_ptr, oldp);
- (void)mutex_unlock(&ar_ptr->mutex);
- return newmem;
+ return newp;
}
@@ -2876,8 +3041,7 @@ Void_t* rEALLOc(oldmem, bytes) Void_t* oldmem; size_t bytes;
}
check_inuse_chunk(ar_ptr, newp);
- (void)mutex_unlock(&ar_ptr->mutex);
- return chunk2mem(newp);
+ return newp;
}
@@ -2910,14 +3074,16 @@ Void_t* mEMALIGn(alignment, bytes) size_t alignment; size_t bytes;
{
arena *ar_ptr;
INTERNAL_SIZE_T nb; /* padded request size */
- char* m; /* memory returned by malloc call */
- mchunkptr p; /* corresponding chunk */
- char* brk; /* alignment point within p */
- mchunkptr newp; /* chunk to return */
- INTERNAL_SIZE_T newsize; /* its size */
- INTERNAL_SIZE_T leadsize; /* leading space befor alignment point */
- mchunkptr remainder; /* spare room at end to split off */
- long remainder_size; /* its size */
+ mchunkptr p;
+
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+ if (__memalign_hook != NULL) {
+ Void_t* result;
+
+ result = (*__memalign_hook)(alignment, bytes);
+ return result;
+ }
+#endif
/* If need less alignment than we give anyway, just relay to malloc */
@@ -2927,18 +3093,36 @@ Void_t* mEMALIGn(alignment, bytes) size_t alignment; size_t bytes;
if (alignment < MINSIZE) alignment = MINSIZE;
- /* Call malloc with worst case padding to hit alignment. */
-
nb = request2size(bytes);
arena_get(ar_ptr, nb + alignment + MINSIZE);
if(!ar_ptr)
return 0;
- p = chunk_alloc(ar_ptr, nb + alignment + MINSIZE);
+ p = chunk_align(ar_ptr, nb, alignment);
+ (void)mutex_unlock(&ar_ptr->mutex);
+ return p ? chunk2mem(p) : NULL;
+}
- if (p == 0) {
- (void)mutex_unlock(&ar_ptr->mutex);
+static mchunkptr
+#if __STD_C
+chunk_align(arena* ar_ptr, INTERNAL_SIZE_T nb, size_t alignment)
+#else
+chunk_align(ar_ptr, nb, alignment)
+arena* ar_ptr; INTERNAL_SIZE_T nb; size_t alignment;
+#endif
+{
+ char* m; /* memory returned by malloc call */
+ mchunkptr p; /* corresponding chunk */
+ char* brk; /* alignment point within p */
+ mchunkptr newp; /* chunk to return */
+ INTERNAL_SIZE_T newsize; /* its size */
+ INTERNAL_SIZE_T leadsize; /* leading space befor alignment point */
+ mchunkptr remainder; /* spare room at end to split off */
+ long remainder_size; /* its size */
+
+ /* Call chunk_alloc with worst case padding to hit alignment. */
+ p = chunk_alloc(ar_ptr, nb + alignment + MINSIZE);
+ if (p == 0)
return 0; /* propagate failure */
- }
m = chunk2mem(p);
@@ -2946,8 +3130,7 @@ Void_t* mEMALIGn(alignment, bytes) size_t alignment; size_t bytes;
{
#if HAVE_MMAP
if(chunk_is_mmapped(p)) {
- (void)mutex_unlock(&ar_ptr->mutex);
- return chunk2mem(p); /* nothing more to do */
+ return p; /* nothing more to do */
}
#endif
}
@@ -2963,7 +3146,7 @@ Void_t* mEMALIGn(alignment, bytes) size_t alignment; size_t bytes;
*/
brk = (char*)mem2chunk(((unsigned long)(m + alignment - 1)) & -alignment);
- if ((long)(brk - (char*)(p)) < (long)MINSIZE) brk = brk + alignment;
+ if ((long)(brk - (char*)(p)) < (long)MINSIZE) brk += alignment;
newp = (mchunkptr)brk;
leadsize = brk - (char*)(p);
@@ -2974,8 +3157,7 @@ Void_t* mEMALIGn(alignment, bytes) size_t alignment; size_t bytes;
{
newp->prev_size = p->prev_size + leadsize;
set_head(newp, newsize|IS_MMAPPED);
- (void)mutex_unlock(&ar_ptr->mutex);
- return chunk2mem(newp);
+ return newp;
}
#endif
@@ -3003,9 +3185,7 @@ Void_t* mEMALIGn(alignment, bytes) size_t alignment; size_t bytes;
}
check_inuse_chunk(ar_ptr, p);
- (void)mutex_unlock(&ar_ptr->mutex);
- return chunk2mem(p);
-
+ return p;
}
@@ -3044,7 +3224,7 @@ Void_t* pvALLOc(bytes) size_t bytes;
/*
- calloc calls malloc, then zeroes out the allocated chunk.
+ calloc calls chunk_alloc, then zeroes out the allocated chunk.
*/
@@ -3056,11 +3236,23 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size;
{
arena *ar_ptr;
mchunkptr p, oldtop;
- INTERNAL_SIZE_T csz, oldtopsize;
+ INTERNAL_SIZE_T sz, csz, oldtopsize;
Void_t* mem;
- INTERNAL_SIZE_T sz = request2size(n * elem_size);
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+ if (__malloc_hook != NULL) {
+ sz = n * elem_size;
+ mem = (*__malloc_hook)(sz);
+#ifdef HAVE_MEMCPY
+ memset(mem, 0, sz);
+#else
+ while(sz > 0) mem[--sz] = 0; /* rather inefficient */
+#endif
+ return mem;
+ }
+#endif
+ sz = request2size(n * elem_size);
arena_get(ar_ptr, sz);
if(!ar_ptr)
return 0;
@@ -3232,7 +3424,7 @@ heap_trim(heap, pad) heap_info *heap; size_t pad;
assert(p->size == (0|PREV_INUSE)); /* must be fencepost */
p = prev_chunk(p);
new_size = chunksize(p) + (MINSIZE-2*SIZE_SZ);
- assert(new_size>0 && new_size<(long int)(2*MINSIZE));
+ assert(new_size>0 && new_size<(long)(2*MINSIZE));
if(!prev_inuse(p))
new_size += p->prev_size;
assert(new_size>0 && new_size<HEAP_MAX_SIZE);
@@ -3513,29 +3705,241 @@ int mALLOPt(param_number, value) int param_number; int value;
#else
if (value != 0) return 0; else n_mmaps_max = value; return 1;
#endif
+ case M_CHECK_ACTION:
+ check_action = value; return 1;
default:
return 0;
}
}
+
+#ifdef _LIBC
+weak_alias (__libc_calloc, __calloc) weak_alias (__libc_calloc, calloc)
+weak_alias (__libc_free, __cfree) weak_alias (__libc_free, cfree)
+weak_alias (__libc_free, __free) weak_alias (__libc_free, free)
+weak_alias (__libc_malloc, __malloc) weak_alias (__libc_malloc, malloc)
+weak_alias (__libc_memalign, __memalign) weak_alias (__libc_memalign, memalign)
+weak_alias (__libc_realloc, __realloc) weak_alias (__libc_realloc, realloc)
+weak_alias (__libc_valloc, __valloc) weak_alias (__libc_valloc, valloc)
+weak_alias (__libc_pvalloc, __pvalloc) weak_alias (__libc_pvalloc, pvalloc)
+weak_alias (__libc_mallinfo, __mallinfo) weak_alias (__libc_mallinfo, mallinfo)
+weak_alias (__libc_mallopt, __mallopt) weak_alias (__libc_mallopt, mallopt)
+
+#undef malloc_stats
+weak_alias (__malloc_stats, malloc_stats)
+#undef malloc_usable_size
+weak_alias (__malloc_usable_size, malloc_usable_size)
+#undef malloc_trim
+weak_alias (__malloc_trim, malloc_trim)
+#endif
+
+
+#if defined(_LIBC) || defined(MALLOC_HOOKS)
+
+/* A simple, standard set of debugging hooks. Overhead is `only' one
+ byte per chunk; still this will catch most cases of double frees or
+ overruns. */
+
+#define MAGICBYTE ((char)0xd7)
-#if 0 && defined(_LIBC)
-weak_alias (__libc_calloc, calloc)
-weak_alias (__libc_free, cfree)
-weak_alias (__libc_free, free)
-weak_alias (__libc_malloc, malloc)
-weak_alias (__libc_memalign, memalign)
-weak_alias (__libc_realloc, realloc)
-weak_alias (__libc_valloc, valloc)
-weak_alias (__libc_pvalloc, pvalloc)
-weak_alias (__libc_mallinfo, mallinfo)
-weak_alias (__libc_mallopt, mallopt)
+/* Convert a pointer to be free()d or realloc()ed to a valid chunk
+ pointer. If the provided pointer is not valid, return NULL. The
+ goal here is to avoid crashes, unlike in the MALLOC_DEBUG code. */
+
+static mchunkptr
+#if __STD_C
+mem2chunk_check(Void_t* mem)
+#else
+mem2chunk_check(mem) Void_t* mem;
#endif
+{
+ mchunkptr p;
+ INTERNAL_SIZE_T sz;
+
+ p = mem2chunk(mem);
+ if(!aligned_OK(p)) return NULL;
+ if( (char*)p>=sbrk_base && (char*)p<(sbrk_base+sbrked_mem) ) {
+ /* Must be a chunk in conventional memory. */
+ if(chunk_is_mmapped(p) ||
+ ( (sz = chunksize(p)), ((char*)p + sz)>=(sbrk_base+sbrked_mem) ) ||
+ sz<MINSIZE || sz&MALLOC_ALIGN_MASK || !inuse(p) ) return NULL;
+ if(*((char*)p + sz + (SIZE_SZ-1)) != MAGICBYTE) return NULL;
+ *((char*)p + sz + (SIZE_SZ-1)) = 0;
+ } else {
+ unsigned long offset, page_mask = malloc_getpagesize-1;
+
+ /* mmap()ed chunks have MALLOC_ALIGNMENT or higher power-of two
+ alignment relative to the beginning of a page. Check this
+ first. */
+ offset = (unsigned long)mem & page_mask;
+ if((offset!=MALLOC_ALIGNMENT && offset!=0 && offset!=0x10 &&
+ offset!=0x20 && offset!=0x40 && offset!=0x80 && offset!=0x100 &&
+ offset!=0x200 && offset!=0x400 && offset!=0x800 && offset!=0x1000 &&
+ offset<0x2000) ||
+ !chunk_is_mmapped(p) || (p->size & PREV_INUSE) ||
+ ( (((unsigned long)p - p->prev_size) & page_mask) != 0 ) ||
+ ( (sz = chunksize(p)), ((p->prev_size + sz) & page_mask) != 0 ) )
+ return NULL;
+ if(*((char*)p + sz - 1) != MAGICBYTE) return NULL;
+ *((char*)p + sz - 1) = 0;
+ }
+ return p;
+}
+
+static Void_t*
+#if __STD_C
+malloc_check(size_t sz)
+#else
+malloc_check(sz) size_t sz;
+#endif
+{
+ mchunkptr victim;
+ INTERNAL_SIZE_T nb = request2size(sz + 1);
+
+ (void)mutex_lock(&main_arena.mutex);
+ victim = chunk_alloc(&main_arena, nb);
+ (void)mutex_unlock(&main_arena.mutex);
+ if(!victim) return NULL;
+ nb = chunksize(victim);
+ if(chunk_is_mmapped(victim))
+ --nb;
+ else
+ nb += SIZE_SZ - 1;
+ *((char*)victim + nb) = MAGICBYTE;
+ return chunk2mem(victim);
+}
+
+static void
+#if __STD_C
+free_check(Void_t* mem)
+#else
+free_check(mem) Void_t* mem;
+#endif
+{
+ mchunkptr p;
+
+ if(!mem) return;
+ p = mem2chunk_check(mem);
+ if(!p) {
+ switch(check_action) {
+ case 1:
+ fprintf(stderr, "free(): invalid pointer %lx!\n", (long)(mem));
+ break;
+ case 2:
+ abort();
+ }
+ return;
+ }
+#if HAVE_MMAP
+ if (chunk_is_mmapped(p)) {
+ munmap_chunk(p);
+ return;
+ }
+#endif
+ (void)mutex_lock(&main_arena.mutex);
+ chunk_free(&main_arena, p);
+ (void)mutex_unlock(&main_arena.mutex);
+}
+
+static Void_t*
+#if __STD_C
+realloc_check(Void_t* oldmem, size_t bytes)
+#else
+realloc_check(oldmem, bytes) Void_t* oldmem; size_t bytes;
+#endif
+{
+ mchunkptr oldp, newp;
+ INTERNAL_SIZE_T nb, oldsize;
+
+ if (oldmem == 0) return malloc_check(bytes);
+ oldp = mem2chunk_check(oldmem);
+ if(!oldp) {
+ switch(check_action) {
+ case 1:
+ fprintf(stderr, "realloc(): invalid pointer %lx!\n", (long)(oldmem));
+ break;
+ case 2:
+ abort();
+ }
+ return malloc_check(bytes);
+ }
+ oldsize = chunksize(oldp);
+
+ nb = request2size(bytes+1);
+
+ (void)mutex_lock(&main_arena.mutex);
+#if HAVE_MMAP
+ if (chunk_is_mmapped(oldp)) {
+#if HAVE_MREMAP
+ newp = mremap_chunk(oldp, nb);
+ if(!newp) {
+#endif
+ /* Note the extra SIZE_SZ overhead. */
+ if(oldsize - SIZE_SZ >= nb) newp = oldp; /* do nothing */
+ else {
+ /* Must alloc, copy, free. */
+ newp = chunk_alloc(&main_arena, nb);
+ if (newp) {
+ MALLOC_COPY(chunk2mem(newp), oldmem, oldsize - 2*SIZE_SZ);
+ munmap_chunk(oldp);
+ }
+ }
+#if HAVE_MREMAP
+ }
+#endif
+ } else
+#endif /* HAVE_MMAP */
+ newp = chunk_realloc(&main_arena, oldp, oldsize, nb);
+ (void)mutex_unlock(&main_arena.mutex);
+
+ if(!newp) return NULL;
+ nb = chunksize(newp);
+ if(chunk_is_mmapped(newp))
+ --nb;
+ else
+ nb += SIZE_SZ - 1;
+ *((char*)newp + nb) = MAGICBYTE;
+ return chunk2mem(newp);
+}
+
+static Void_t*
+#if __STD_C
+memalign_check(size_t alignment, size_t bytes)
+#else
+memalign_check(alignment, bytes) size_t alignment; size_t bytes;
+#endif
+{
+ INTERNAL_SIZE_T nb;
+ mchunkptr p;
+
+ if (alignment <= MALLOC_ALIGNMENT) return malloc_check(bytes);
+ if (alignment < MINSIZE) alignment = MINSIZE;
+
+ nb = request2size(bytes+1);
+ (void)mutex_lock(&main_arena.mutex);
+ p = chunk_align(&main_arena, nb, alignment);
+ (void)mutex_unlock(&main_arena.mutex);
+ if(!p) return NULL;
+ nb = chunksize(p);
+ if(chunk_is_mmapped(p))
+ --nb;
+ else
+ nb += SIZE_SZ - 1;
+ *((char*)p + nb) = MAGICBYTE;
+ return chunk2mem(p);
+}
+
+#endif /* defined(_LIBC) || defined(MALLOC_HOOKS) */
/*
History:
+ V2.6.4-pt2 Sat Dec 14 1996 Wolfram Gloger (wmglo@dent.med.uni-muenchen.de)
+ * Added debugging hooks
+ * Fixed possible deadlock in realloc() when out of memory
+ * Don't pollute namespace in glibc: use __getpagesize, __mmap, etc.
+
V2.6.4-pt Wed Dec 4 1996 Wolfram Gloger (wmglo@dent.med.uni-muenchen.de)
* Very minor updates from the released 2.6.4 version.
* Trimmed include file down to exported data structures.
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-27 20:08:16 +0000