extern "C" void* chk_memalign(size_t alignment, size_t bytes) {
if (DebugCallsDisabled()) {
return g_malloc_dispatch->memalign(alignment, bytes);
}
if (alignment <= MALLOC_ALIGNMENT) {
return chk_malloc(bytes);
}
// Make the alignment a power of two.
if (!powerof2(alignment)) {
alignment = BIONIC_ROUND_UP_POWER_OF_2(alignment);
}
// here, alignment is at least MALLOC_ALIGNMENT<<1 bytes
// we will align by at least MALLOC_ALIGNMENT bytes
// and at most alignment-MALLOC_ALIGNMENT bytes
size_t size = (alignment-MALLOC_ALIGNMENT) + bytes;
if (size < bytes) { // Overflow.
return NULL;
}
void* base = g_malloc_dispatch->malloc(sizeof(hdr_t) + size + sizeof(ftr_t));
if (base != NULL) {
// Check that the actual pointer that will be returned is aligned
// properly.
uintptr_t ptr = reinterpret_cast<uintptr_t>(user(reinterpret_cast<hdr_t*>(base)));
if ((ptr % alignment) != 0) {
// Align the pointer.
ptr += ((-ptr) % alignment);
}
hdr_t* hdr = meta(reinterpret_cast<void*>(ptr));
hdr->base = base;
hdr->bt_depth = GET_BACKTRACE(hdr->bt, MAX_BACKTRACE_DEPTH);
add(hdr, bytes);
return user(hdr);
}
return base;
}
void* debug_memalign(size_t alignment, size_t bytes) {
if (DebugCallsDisabled()) {
return g_dispatch->memalign(alignment, bytes);
}
ScopedDisableDebugCalls disable;
if (bytes == 0) {
bytes = 1;
}
void* pointer;
if (g_debug->need_header()) {
if (bytes > Header::max_size()) {
errno = ENOMEM;
return nullptr;
}
// Make the alignment a power of two.
if (!powerof2(alignment)) {
alignment = BIONIC_ROUND_UP_POWER_OF_2(alignment);
}
// Force the alignment to at least MINIMUM_ALIGNMENT_BYTES to guarantee
// that the header is aligned properly.
if (alignment < MINIMUM_ALIGNMENT_BYTES) {
alignment = MINIMUM_ALIGNMENT_BYTES;
}
// We don't have any idea what the natural alignment of
// the underlying native allocator is, so we always need to
// over allocate.
size_t real_size = alignment + bytes + g_debug->extra_bytes();
if (real_size < bytes) {
// Overflow.
errno = ENOMEM;
return nullptr;
}
pointer = g_dispatch->malloc(real_size);
if (pointer == nullptr) {
return nullptr;
}
uintptr_t value = reinterpret_cast<uintptr_t>(pointer) + g_debug->pointer_offset();
// Now align the pointer.
value += (-value % alignment);
Header* header = g_debug->GetHeader(reinterpret_cast<void*>(value));
pointer = InitHeader(header, pointer, bytes);
} else {
size_t real_size = bytes + g_debug->extra_bytes();
if (real_size < bytes) {
// Overflow.
errno = ENOMEM;
return nullptr;
}
pointer = g_dispatch->memalign(alignment, real_size);
}
if (pointer != nullptr && g_debug->config().options & FILL_ON_ALLOC) {
size_t bytes = internal_malloc_usable_size(pointer);
size_t fill_bytes = g_debug->config().fill_on_alloc_bytes;
bytes = (bytes < fill_bytes) ? bytes : fill_bytes;
memset(pointer, g_debug->config().fill_alloc_value, bytes);
}
return pointer;
}
