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malloc.c
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malloc.c
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/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
* Copyright (c) 2008-2022 Ivan Maidanski
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*/
#include "private/gc_priv.h"
#include <string.h>
/* Allocate reclaim list for the kind. Returns TRUE on success. */
STATIC GC_bool GC_alloc_reclaim_list(struct obj_kind *ok)
{
struct hblk ** result;
GC_ASSERT(I_HOLD_LOCK());
result = (struct hblk **)GC_scratch_alloc(
(MAXOBJGRANULES+1) * sizeof(struct hblk *));
if (EXPECT(NULL == result, FALSE)) return FALSE;
BZERO(result, (MAXOBJGRANULES+1)*sizeof(struct hblk *));
ok -> ok_reclaim_list = result;
return TRUE;
}
/* Allocate a large block of size lb_adjusted bytes with the requested */
/* alignment (align_m1 plus one). The block is not cleared. We assume */
/* that the size is non-zero and a multiple of GC_GRANULE_BYTES, and */
/* that it already includes EXTRA_BYTES value. The flags argument */
/* should be IGNORE_OFF_PAGE or 0. Calls GC_allochblk() to do the */
/* actual allocation, but also triggers collection and/or heap */
/* expansion as appropriate. Updates value of GC_bytes_allocd; does */
/* also other accounting. */
STATIC ptr_t GC_alloc_large(size_t lb_adjusted, int k, unsigned flags,
size_t align_m1)
{
struct hblk *h;
size_t n_blocks; /* includes alignment */
ptr_t result = NULL;
GC_bool retry = FALSE;
GC_ASSERT(I_HOLD_LOCK());
GC_ASSERT(lb_adjusted != 0 && (lb_adjusted & (GC_GRANULE_BYTES-1)) == 0);
n_blocks = OBJ_SZ_TO_BLOCKS_CHECKED(SIZET_SAT_ADD(lb_adjusted, align_m1));
if (!EXPECT(GC_is_initialized, TRUE)) {
UNLOCK(); /* just to unset GC_lock_holder */
GC_init();
LOCK();
}
/* Do our share of marking work. */
if (GC_incremental && !GC_dont_gc) {
ENTER_GC();
GC_collect_a_little_inner(n_blocks);
EXIT_GC();
}
h = GC_allochblk(lb_adjusted, k, flags, align_m1);
# ifdef USE_MUNMAP
if (NULL == h) {
GC_merge_unmapped();
h = GC_allochblk(lb_adjusted, k, flags, align_m1);
}
# endif
while (NULL == h && GC_collect_or_expand(n_blocks, flags, retry)) {
h = GC_allochblk(lb_adjusted, k, flags, align_m1);
retry = TRUE;
}
if (EXPECT(h != NULL, TRUE)) {
GC_bytes_allocd += lb_adjusted;
if (lb_adjusted > HBLKSIZE) {
GC_large_allocd_bytes += HBLKSIZE * OBJ_SZ_TO_BLOCKS(lb_adjusted);
if (GC_large_allocd_bytes > GC_max_large_allocd_bytes)
GC_max_large_allocd_bytes = GC_large_allocd_bytes;
}
/* FIXME: Do we need some way to reset GC_max_large_allocd_bytes? */
result = h -> hb_body;
GC_ASSERT((ADDR(result) & align_m1) == 0);
}
return result;
}
/* Allocate a large block of given size in bytes, clear it if */
/* appropriate. We assume that the size is non-zero and */
/* a multiple of GC_GRANULE_BYTES, and that it already includes */
/* EXTRA_BYTES value. Update value of GC_bytes_allocd. */
STATIC ptr_t GC_alloc_large_and_clear(size_t lb_adjusted, int k,
unsigned flags)
{
ptr_t result;
GC_ASSERT(I_HOLD_LOCK());
result = GC_alloc_large(lb_adjusted, k, flags, 0 /* align_m1 */);
if (EXPECT(result != NULL, TRUE)
&& (GC_debugging_started || GC_obj_kinds[k].ok_init)) {
/* Clear the whole block, in case of GC_realloc call. */
BZERO(result, HBLKSIZE * OBJ_SZ_TO_BLOCKS(lb_adjusted));
}
return result;
}
/* Fill in additional entries in GC_size_map, including the i-th one. */
/* Note that a filled in section of the array ending at n always */
/* has the length of at least n/4. */
STATIC void GC_extend_size_map(size_t i)
{
size_t original_lg = ALLOC_REQUEST_GRANS(i);
size_t lg;
size_t byte_sz = GRANULES_TO_BYTES(original_lg);
/* The size we try to preserve. */
/* Close to i, unless this would */
/* introduce too many distinct sizes. */
size_t smaller_than_i = byte_sz - (byte_sz >> 3);
size_t low_limit; /* The lowest indexed entry we initialize. */
size_t number_of_objs;
GC_ASSERT(I_HOLD_LOCK());
GC_ASSERT(0 == GC_size_map[i]);
if (0 == GC_size_map[smaller_than_i]) {
low_limit = byte_sz - (byte_sz >> 2); /* much smaller than i */
lg = original_lg;
while (GC_size_map[low_limit] != 0)
low_limit++;
} else {
low_limit = smaller_than_i + 1;
while (GC_size_map[low_limit] != 0)
low_limit++;
lg = ALLOC_REQUEST_GRANS(low_limit);
lg += lg >> 3;
if (lg < original_lg) lg = original_lg;
}
/* For these larger sizes, we use an even number of granules. */
/* This makes it easier to, e.g., construct a 16-byte-aligned */
/* allocator even if GC_GRANULE_BYTES is 8. */
lg = (lg + 1) & ~(size_t)1;
if (lg > MAXOBJGRANULES) lg = MAXOBJGRANULES;
/* If we can fit the same number of larger objects in a block, do so. */
GC_ASSERT(lg != 0);
number_of_objs = HBLK_GRANULES / lg;
GC_ASSERT(number_of_objs != 0);
lg = (HBLK_GRANULES / number_of_objs) & ~(size_t)1;
byte_sz = GRANULES_TO_BYTES(lg) - EXTRA_BYTES;
/* We may need one extra byte; do not always */
/* fill in GC_size_map[byte_sz]. */
for (; low_limit <= byte_sz; low_limit++)
GC_size_map[low_limit] = lg;
}
STATIC void * GC_generic_malloc_inner_small(size_t lb, int k)
{
struct obj_kind *ok = &GC_obj_kinds[k];
size_t lg = GC_size_map[lb];
void **opp = &(ok -> ok_freelist[lg]);
void *op = *opp;
GC_ASSERT(I_HOLD_LOCK());
if (EXPECT(NULL == op, FALSE)) {
if (0 == lg) {
if (!EXPECT(GC_is_initialized, TRUE)) {
UNLOCK(); /* just to unset GC_lock_holder */
GC_init();
LOCK();
lg = GC_size_map[lb];
}
if (0 == lg) {
GC_extend_size_map(lb);
lg = GC_size_map[lb];
GC_ASSERT(lg != 0);
}
/* Retry */
opp = &(ok -> ok_freelist[lg]);
op = *opp;
}
if (NULL == op) {
if (NULL == ok -> ok_reclaim_list
&& !GC_alloc_reclaim_list(ok))
return NULL;
op = GC_allocobj(lg, k);
if (NULL == op) return NULL;
}
}
*opp = obj_link(op);
obj_link(op) = NULL;
GC_bytes_allocd += GRANULES_TO_BYTES((word)lg);
return op;
}
GC_INNER void * GC_generic_malloc_inner(size_t lb, int k, unsigned flags)
{
size_t lb_adjusted;
GC_ASSERT(I_HOLD_LOCK());
GC_ASSERT(k < MAXOBJKINDS);
if (SMALL_OBJ(lb)) {
return GC_generic_malloc_inner_small(lb, k);
}
# if MAX_EXTRA_BYTES > 0
if ((flags & IGNORE_OFF_PAGE) != 0 && lb >= HBLKSIZE) {
/* No need to add EXTRA_BYTES. */
lb_adjusted = lb;
} else
# endif
/* else */ {
lb_adjusted = ADD_EXTRA_BYTES(lb);
}
return GC_alloc_large_and_clear(ROUNDUP_GRANULE_SIZE(lb_adjusted),
k, flags);
}
#ifdef GC_COLLECT_AT_MALLOC
/* Parameter to force GC at every malloc of size greater or equal to */
/* the given value. This might be handy during debugging. */
# if defined(CPPCHECK)
size_t GC_dbg_collect_at_malloc_min_lb = 16*1024; /* e.g. */
# else
size_t GC_dbg_collect_at_malloc_min_lb = (GC_COLLECT_AT_MALLOC);
# endif
#endif
GC_INNER void * GC_generic_malloc_aligned(size_t lb, int k, unsigned flags,
size_t align_m1)
{
void * result;
GC_ASSERT(k < MAXOBJKINDS);
if (EXPECT(get_have_errors(), FALSE))
GC_print_all_errors();
GC_INVOKE_FINALIZERS();
GC_DBG_COLLECT_AT_MALLOC(lb);
if (SMALL_OBJ(lb) && EXPECT(align_m1 < GC_GRANULE_BYTES, TRUE)) {
LOCK();
result = GC_generic_malloc_inner_small(lb, k);
UNLOCK();
} else {
# ifdef THREADS
size_t lg;
# endif
size_t lb_adjusted;
GC_bool init;
# if MAX_EXTRA_BYTES > 0
if ((flags & IGNORE_OFF_PAGE) != 0 && lb >= HBLKSIZE) {
/* No need to add EXTRA_BYTES. */
lb_adjusted = ROUNDUP_GRANULE_SIZE(lb);
# ifdef THREADS
lg = BYTES_TO_GRANULES(lb_adjusted);
# endif
} else
# endif
/* else */ {
# ifndef THREADS
size_t lg; /* CPPCHECK */
# endif
if (EXPECT(0 == lb, FALSE)) lb = 1;
lg = ALLOC_REQUEST_GRANS(lb);
lb_adjusted = GRANULES_TO_BYTES(lg);
}
init = GC_obj_kinds[k].ok_init;
if (EXPECT(align_m1 < GC_GRANULE_BYTES, TRUE)) {
align_m1 = 0;
} else if (align_m1 < HBLKSIZE) {
align_m1 = HBLKSIZE - 1;
}
LOCK();
result = GC_alloc_large(lb_adjusted, k, flags, align_m1);
if (EXPECT(result != NULL, TRUE)) {
if (GC_debugging_started
# ifndef THREADS
|| init
# endif
) {
BZERO(result, HBLKSIZE * OBJ_SZ_TO_BLOCKS(lb_adjusted));
} else {
# ifdef THREADS
GC_ASSERT(GRANULES_TO_PTRS(lg) >= 2);
/* Clear any memory that might be used for GC descriptors */
/* before we release the allocator lock. */
((ptr_t *)result)[0] = NULL;
((ptr_t *)result)[1] = NULL;
((ptr_t *)result)[GRANULES_TO_PTRS(lg) - 1] = NULL;
((ptr_t *)result)[GRANULES_TO_PTRS(lg) - 2] = NULL;
# endif
}
}
UNLOCK();
# ifdef THREADS
if (init && !GC_debugging_started && result != NULL) {
/* Clear the rest (i.e. excluding the initial 2 words). */
BZERO((ptr_t *)result + 2,
HBLKSIZE * OBJ_SZ_TO_BLOCKS(lb_adjusted) - 2*sizeof(ptr_t));
}
# endif
}
if (EXPECT(NULL == result, FALSE))
result = (*GC_get_oom_fn())(lb); /* might be misaligned */
return result;
}
GC_API GC_ATTR_MALLOC void * GC_CALL GC_generic_malloc(size_t lb, int k)
{
return GC_generic_malloc_aligned(lb, k, 0 /* flags */, 0 /* align_m1 */);
}
GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc_kind_global(size_t lb, int k)
{
return GC_malloc_kind_aligned_global(lb, k, 0 /* align_m1 */);
}
GC_INNER void * GC_malloc_kind_aligned_global(size_t lb, int k,
size_t align_m1)
{
GC_ASSERT(k < MAXOBJKINDS);
if (SMALL_OBJ(lb) && EXPECT(align_m1 < HBLKSIZE / 2, TRUE)) {
void *op;
void **opp;
size_t lg;
GC_DBG_COLLECT_AT_MALLOC(lb);
LOCK();
lg = GC_size_map[lb];
opp = &GC_obj_kinds[k].ok_freelist[lg];
op = *opp;
if (EXPECT(align_m1 >= GC_GRANULE_BYTES, FALSE)) {
/* TODO: Avoid linear search. */
for (; (ADDR(op) & align_m1) != 0; op = *opp) {
opp = &obj_link(op);
}
}
if (EXPECT(op != NULL, TRUE)) {
GC_ASSERT(PTRFREE == k || NULL == obj_link(op)
|| (ADDR(obj_link(op)) < GC_greatest_real_heap_addr
&& GC_least_real_heap_addr < ADDR(obj_link(op))));
*opp = obj_link(op);
if (k != PTRFREE)
obj_link(op) = NULL;
GC_bytes_allocd += GRANULES_TO_BYTES((word)lg);
UNLOCK();
GC_ASSERT((ADDR(op) & align_m1) == 0);
return op;
}
UNLOCK();
}
/* We make the GC_clear_stack() call a tail one, hoping to get more */
/* of the stack. */
return GC_clear_stack(GC_generic_malloc_aligned(lb, k, 0 /* flags */,
align_m1));
}
#if defined(THREADS) && !defined(THREAD_LOCAL_ALLOC)
GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc_kind(size_t lb, int k)
{
return GC_malloc_kind_global(lb, k);
}
#endif
/* Allocate lb bytes of atomic (pointer-free) data. */
GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc_atomic(size_t lb)
{
return GC_malloc_kind(lb, PTRFREE);
}
/* Allocate lb bytes of composite (pointerful) data. */
GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc(size_t lb)
{
return GC_malloc_kind(lb, NORMAL);
}
GC_API GC_ATTR_MALLOC void * GC_CALL GC_generic_malloc_uncollectable(
size_t lb, int k)
{
void *op;
size_t lb_orig = lb;
GC_ASSERT(k < MAXOBJKINDS);
if (EXTRA_BYTES != 0 && EXPECT(lb != 0, TRUE)) lb--;
/* We do not need the extra byte, since this will */
/* not be collected anyway. */
if (SMALL_OBJ(lb)) {
void **opp;
size_t lg;
if (EXPECT(get_have_errors(), FALSE))
GC_print_all_errors();
GC_INVOKE_FINALIZERS();
GC_DBG_COLLECT_AT_MALLOC(lb_orig);
LOCK();
lg = GC_size_map[lb];
opp = &GC_obj_kinds[k].ok_freelist[lg];
op = *opp;
if (EXPECT(op != NULL, TRUE)) {
*opp = obj_link(op);
obj_link(op) = 0;
GC_bytes_allocd += GRANULES_TO_BYTES((word)lg);
/* Mark bit was already set on free list. It will be */
/* cleared only temporarily during a collection, as a */
/* result of the normal free-list mark bit clearing. */
GC_non_gc_bytes += GRANULES_TO_BYTES((word)lg);
} else {
op = GC_generic_malloc_inner_small(lb, k);
if (NULL == op) {
GC_oom_func oom_fn = GC_oom_fn;
UNLOCK();
return (*oom_fn)(lb_orig);
}
/* For small objects, the free lists are completely marked. */
}
GC_ASSERT(GC_is_marked(op));
UNLOCK();
} else {
op = GC_generic_malloc_aligned(lb, k, 0 /* flags */, 0 /* align_m1 */);
if (op /* != NULL */) { /* CPPCHECK */
hdr * hhdr = HDR(op);
GC_ASSERT(HBLKDISPL(op) == 0); /* large block */
/* We do not need to acquire the allocator lock before HDR(op), */
/* since we have an undisguised pointer, but we need it while */
/* we adjust the mark bits. */
LOCK();
set_mark_bit_from_hdr(hhdr, 0); /* Only object. */
# ifndef THREADS
GC_ASSERT(hhdr -> hb_n_marks == 0);
/* This is not guaranteed in the multi-threaded case */
/* because the counter could be updated before locking. */
# endif
hhdr -> hb_n_marks = 1;
UNLOCK();
}
}
return op;
}
/* Allocate lb bytes of pointerful, traced, but not collectible data. */
GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc_uncollectable(size_t lb)
{
return GC_generic_malloc_uncollectable(lb, UNCOLLECTABLE);
}
#ifdef GC_ATOMIC_UNCOLLECTABLE
/* Allocate lb bytes of pointer-free, untraced, uncollectible data */
/* This is normally roughly equivalent to the system malloc. */
/* But it may be useful if malloc is redefined. */
GC_API GC_ATTR_MALLOC void * GC_CALL
GC_malloc_atomic_uncollectable(size_t lb)
{
return GC_generic_malloc_uncollectable(lb, AUNCOLLECTABLE);
}
#endif /* GC_ATOMIC_UNCOLLECTABLE */
#if defined(REDIRECT_MALLOC) && !defined(REDIRECT_MALLOC_IN_HEADER)
# ifndef MSWINCE
# include <errno.h>
# endif
/* Avoid unnecessary nested procedure calls here, by #defining some */
/* malloc replacements. Otherwise we end up saving a meaningless */
/* return address in the object. It also speeds things up, but it is */
/* admittedly quite ugly. */
# define GC_debug_malloc_replacement(lb) GC_debug_malloc(lb, GC_DBG_EXTRAS)
# if defined(CPPCHECK)
# define REDIRECT_MALLOC_F GC_malloc /* e.g. */
# else
# define REDIRECT_MALLOC_F REDIRECT_MALLOC
# endif
void * malloc(size_t lb)
{
/* It might help to manually inline the GC_malloc call here. */
/* But any decent compiler should reduce the extra procedure call */
/* to at most a jump instruction in this case. */
# if defined(I386) && defined(GC_SOLARIS_THREADS)
/* Thread initialization can call malloc before we are ready for. */
/* It is not clear that this is enough to help matters. */
/* The thread implementation may well call malloc at other */
/* inopportune times. */
if (!EXPECT(GC_is_initialized, TRUE)) return sbrk(lb);
# endif
return (void *)REDIRECT_MALLOC_F(lb);
}
# if defined(GC_LINUX_THREADS)
# ifdef HAVE_LIBPTHREAD_SO
STATIC ptr_t GC_libpthread_start = NULL;
STATIC ptr_t GC_libpthread_end = NULL;
# endif
STATIC ptr_t GC_libld_start = NULL;
STATIC ptr_t GC_libld_end = NULL;
static GC_bool lib_bounds_set = FALSE;
GC_INNER void GC_init_lib_bounds(void)
{
IF_CANCEL(int cancel_state;)
/* This test does not need to ensure memory visibility, since */
/* the bounds will be set when/if we create another thread. */
if (EXPECT(lib_bounds_set, TRUE)) return;
DISABLE_CANCEL(cancel_state);
GC_init(); /* if not called yet */
# if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED)
LOCK(); /* just to set GC_lock_holder */
# endif
# ifdef HAVE_LIBPTHREAD_SO
if (!GC_text_mapping("libpthread-",
&GC_libpthread_start, &GC_libpthread_end)) {
WARN("Failed to find libpthread.so text mapping: Expect crash\n", 0);
/* This might still work with some versions of libpthread, */
/* so we do not abort. */
}
# endif
if (!GC_text_mapping("ld-", &GC_libld_start, &GC_libld_end)) {
WARN("Failed to find ld.so text mapping: Expect crash\n", 0);
}
# if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED)
UNLOCK();
# endif
RESTORE_CANCEL(cancel_state);
lib_bounds_set = TRUE;
}
# endif /* GC_LINUX_THREADS */
void * calloc(size_t n, size_t lb)
{
if (EXPECT((lb | n) > GC_SQRT_SIZE_MAX, FALSE) /* fast initial test */
&& lb && n > GC_SIZE_MAX / lb)
return (*GC_get_oom_fn())(GC_SIZE_MAX); /* n*lb overflow */
# if defined(GC_LINUX_THREADS)
/* The linker may allocate some memory that is only pointed to by */
/* mmapped thread stacks. Make sure it is not collectible. */
{
ptr_t caller = (ptr_t)__builtin_return_address(0);
GC_init_lib_bounds();
if (ADDR_INSIDE(caller, GC_libld_start, GC_libld_end)
# ifdef HAVE_LIBPTHREAD_SO
|| ADDR_INSIDE(caller, GC_libpthread_start, GC_libpthread_end)
/* The two ranges are actually usually adjacent, */
/* so there may be a way to speed this up. */
# endif
) {
return GC_generic_malloc_uncollectable(n * lb, UNCOLLECTABLE);
}
}
# endif
return (void *)REDIRECT_MALLOC_F(n * lb);
}
# ifndef strdup
char *strdup(const char *s)
{
size_t lb = strlen(s) + 1;
char *result = (char *)REDIRECT_MALLOC_F(lb);
if (EXPECT(NULL == result, FALSE)) {
errno = ENOMEM;
return NULL;
}
BCOPY(s, result, lb);
return result;
}
# endif /* !defined(strdup) */
/* If strdup is macro defined, we assume that it actually calls malloc, */
/* and thus the right thing will happen even without overriding it. */
/* This seems to be true on most Linux systems. */
# ifndef strndup
/* This is similar to strdup(). */
char *strndup(const char *str, size_t size)
{
char *copy;
size_t len = strlen(str);
if (EXPECT(len > size, FALSE))
len = size;
copy = (char *)REDIRECT_MALLOC_F(len + 1);
if (EXPECT(NULL == copy, FALSE)) {
errno = ENOMEM;
return NULL;
}
if (EXPECT(len > 0, TRUE))
BCOPY(str, copy, len);
copy[len] = '\0';
return copy;
}
# endif /* !strndup */
# undef GC_debug_malloc_replacement
#endif /* REDIRECT_MALLOC */
/* Explicitly deallocate the object. hhdr should correspond to p. */
static void free_internal(void *p, const hdr *hhdr)
{
size_t lb = hhdr -> hb_sz; /* size in bytes */
size_t lg = BYTES_TO_GRANULES(lb); /* size in granules */
int k = hhdr -> hb_obj_kind;
GC_bytes_freed += lb;
if (IS_UNCOLLECTABLE(k)) GC_non_gc_bytes -= lb;
if (EXPECT(lg <= MAXOBJGRANULES, TRUE)) {
struct obj_kind *ok = &GC_obj_kinds[k];
void **flh;
/* It is unnecessary to clear the mark bit. If the object is */
/* reallocated, it does not matter. Otherwise, the collector will */
/* do it, since it is on a free list. */
if (ok -> ok_init && EXPECT(lb > sizeof(ptr_t), TRUE)) {
BZERO((ptr_t *)p + 1, lb - sizeof(ptr_t));
}
flh = &(ok -> ok_freelist[lg]);
obj_link(p) = *flh;
*flh = (ptr_t)p;
} else {
if (lb > HBLKSIZE) {
GC_large_allocd_bytes -= HBLKSIZE * OBJ_SZ_TO_BLOCKS(lb);
}
GC_ASSERT(ADDR(HBLKPTR(p)) == ADDR(hhdr -> hb_block));
GC_freehblk(hhdr -> hb_block);
}
}
GC_API void GC_CALL GC_free(void * p)
{
const hdr *hhdr;
if (p /* != NULL */) {
/* CPPCHECK */
} else {
/* Required by ANSI. It's not my fault ... */
return;
}
# ifdef LOG_ALLOCS
GC_log_printf("GC_free(%p) after GC #%lu\n",
p, (unsigned long)GC_gc_no);
# endif
hhdr = HDR(p);
# if defined(REDIRECT_MALLOC) && \
((defined(NEED_CALLINFO) && defined(GC_HAVE_BUILTIN_BACKTRACE)) \
|| defined(GC_SOLARIS_THREADS) || defined(GC_LINUX_THREADS) \
|| defined(MSWIN32))
/* This might be called indirectly by GC_print_callers to free */
/* the result of backtrace_symbols. */
/* For Solaris, we have to redirect malloc calls during */
/* initialization. For the others, this seems to happen */
/* implicitly. */
/* Don't try to deallocate that memory. */
if (EXPECT(NULL == hhdr, FALSE)) return;
# endif
GC_ASSERT(GC_base(p) == p);
LOCK();
free_internal(p, hhdr);
FREE_PROFILER_HOOK(p);
UNLOCK();
}
#ifdef THREADS
GC_INNER void GC_free_inner(void * p)
{
GC_ASSERT(I_HOLD_LOCK());
free_internal(p, HDR(p));
}
#endif /* THREADS */
#if defined(REDIRECT_MALLOC) && !defined(REDIRECT_FREE)
# define REDIRECT_FREE GC_free
#endif
#if defined(REDIRECT_FREE) && !defined(REDIRECT_MALLOC_IN_HEADER)
# if defined(CPPCHECK)
# define REDIRECT_FREE_F GC_free /* e.g. */
# else
# define REDIRECT_FREE_F REDIRECT_FREE
# endif
void free(void * p)
{
# ifdef IGNORE_FREE
UNUSED_ARG(p);
# else
# if defined(GC_LINUX_THREADS) && !defined(USE_PROC_FOR_LIBRARIES)
/* Don't bother with initialization checks. If nothing */
/* has been initialized, the check fails, and that's safe, */
/* since we have not allocated uncollectible objects neither. */
ptr_t caller = (ptr_t)__builtin_return_address(0);
/* This test does not need to ensure memory visibility, since */
/* the bounds will be set when/if we create another thread. */
if (ADDR_INSIDE(caller, GC_libld_start, GC_libld_end)
# ifdef HAVE_LIBPTHREAD_SO
|| ADDR_INSIDE(caller, GC_libpthread_start, GC_libpthread_end)
# endif
) {
GC_free(p);
return;
}
# endif
REDIRECT_FREE_F(p);
# endif
}
#endif /* REDIRECT_FREE */