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/*
* Copyright 2025 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include "allocator.h"
#include <stdlib.h>
#include <algorithm>
#include <log/log.h>
// #define ENABLE_ALLOC_CALLSTACKS 1
#if ENABLE_ALLOC_CALLSTACKS
#include <utils/CallStack.h>
#define ALOGD_CALLSTACK(...) \
do { \
ALOGD(__VA_ARGS__); \
android::CallStack callstack; \
callstack.update(); \
callstack.log(LOG_TAG, ANDROID_LOG_DEBUG, " "); \
} while (false)
#else
#define ALOGD_CALLSTACK(...) \
do { \
} while (false)
#endif
namespace vulkan {
namespace driver {
namespace {
VKAPI_ATTR void* DefaultAllocate(void*,
size_t size,
size_t alignment,
VkSystemAllocationScope) {
void* ptr = nullptr;
// Vulkan requires 'alignment' to be a power of two, but posix_memalign
// additionally requires that it be at least sizeof(void*).
int ret = posix_memalign(&ptr, std::max(alignment, sizeof(void*)), size);
ALOGD_CALLSTACK("Allocate: size=%zu align=%zu => (%d) %p", size, alignment,
ret, ptr);
return ret == 0 ? ptr : nullptr;
}
// This function is marked `noinline` so that LLVM can't infer an object size
// for FORTIFY through it, given that it's abusing malloc_usable_size().
__attribute__((__noinline__))
VKAPI_ATTR void* DefaultReallocate(void*,
void* ptr,
size_t size,
size_t alignment,
VkSystemAllocationScope) {
if (size == 0) {
free(ptr);
return nullptr;
}
// TODO(b/143295633): Right now we never shrink allocations; if the new
// request is smaller than the existing chunk, we just continue using it.
// Right now the loader never reallocs, so this doesn't matter. If that
// changes, or if this code is copied into some other project, this should
// probably have a heuristic to allocate-copy-free when doing so will save
// "enough" space.
size_t old_size = ptr ? malloc_usable_size(ptr) : 0;
if (size <= old_size)
return ptr;
void* new_ptr = nullptr;
if (posix_memalign(&new_ptr, std::max(alignment, sizeof(void*)), size) != 0)
return nullptr;
if (ptr) {
memcpy(new_ptr, ptr, std::min(old_size, size));
free(ptr);
}
return new_ptr;
}
VKAPI_ATTR void DefaultFree(void*, void* ptr) {
ALOGD_CALLSTACK("Free: %p", ptr);
free(ptr);
}
} // anonymous namespace
const VkAllocationCallbacks& GetDefaultAllocator() {
static const VkAllocationCallbacks kDefaultAllocCallbacks = {
.pUserData = nullptr,
.pfnAllocation = DefaultAllocate,
.pfnReallocation = DefaultReallocate,
.pfnFree = DefaultFree,
};
return kDefaultAllocCallbacks;
}
} // namespace driver
} // namespace vulkan
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