void* TCMalloc_SystemAlloc(size_t size, size_t *actual_size, size_t alignment) {
// Discard requests that overflow
if (size + alignment < size) return NULL;
SpinLockHolder lock_holder(&spinlock);
// Enforce minimum alignment
if (alignment < sizeof(MemoryAligner)) alignment = sizeof(MemoryAligner);
// Try twice, once avoiding allocators that failed before, and once
// more trying all allocators even if they failed before.
for (int i = 0; i < 2; i++) {
#ifndef WTF_CHANGES
if (use_devmem && !devmem_failure) {
void* result = TryDevMem(size, actual_size, alignment);
if (result != NULL) return result;
}
#endif
#if HAVE(SBRK)
if (use_sbrk && !sbrk_failure) {
void* result = TrySbrk(size, actual_size, alignment);
if (result != NULL) return result;
}
#endif
#if HAVE(MMAP)
if (use_mmap && !mmap_failure) {
void* result = TryMmap(size, actual_size, alignment);
if (result != NULL) return result;
}
#endif
#if HAVE(VIRTUALALLOC)
if (use_VirtualAlloc && !VirtualAlloc_failure) {
void* result = TryVirtualAlloc(size, actual_size, alignment);
if (result != NULL) return result;
}
#endif
// nothing worked - reset failure flags and try again
devmem_failure = false;
sbrk_failure = false;
mmap_failure = false;
VirtualAlloc_failure = false;
}
return NULL;
}
void* TCMalloc_SystemAlloc(size_t size, size_t alignment) {
#ifndef WTF_CHANGES
if (TCMallocDebug::level >= TCMallocDebug::kVerbose) {
MESSAGE("TCMalloc_SystemAlloc(%" PRIuS ", %" PRIuS")\n",
size, alignment);
}
#endif
SpinLockHolder lock_holder(&spinlock);
// Enforce minimum alignment
if (alignment < sizeof(MemoryAligner)) alignment = sizeof(MemoryAligner);
// Try twice, once avoiding allocators that failed before, and once
// more trying all allocators even if they failed before.
for (int i = 0; i < 2; i++) {
#ifndef WTF_CHANGES
if (use_devmem && !devmem_failure) {
void* result = TryDevMem(size, alignment);
if (result != NULL) return result;
}
#endif
#if HAVE(SBRK)
if (use_sbrk && !sbrk_failure) {
void* result = TrySbrk(size, alignment);
if (result != NULL) return result;
}
#endif
#if HAVE(MMAP)
if (use_mmap && !mmap_failure) {
void* result = TryMmap(size, alignment);
if (result != NULL) return result;
}
#endif
// nothing worked - reset failure flags and try again
devmem_failure = false;
sbrk_failure = false;
mmap_failure = false;
}
return NULL;
}
