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Don't reallocate memory in wasm_rt_replace_memory unless the memory capacity has changed

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刘皓 2025-07-06 13:38:20 -04:00
parent fd822ea498
commit eb8794874e
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GPG key ID: 7901753DB465B711
1 changed files with 6 additions and 7 deletions
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13
binding-sandbox/wasm-rt.cpp
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@ -89,8 +89,6 @@ extern "C" void wasm_rt_allocate_memory(wasm_rt_memory_t *memory, uint32_t initi
}
void wasm_rt_replace_memory(wasm_rt_memory_t *memory, size_t size, size_t capacity) {
std::free(memory->private_data);
size = size / WASM_PAGE_SIZE * WASM_PAGE_SIZE;
capacity = capacity / WASM_PAGE_SIZE * WASM_PAGE_SIZE;
@ -98,15 +96,16 @@ void wasm_rt_replace_memory(wasm_rt_memory_t *memory, size_t size, size_t capaci
MKXPZ_THROW(std::bad_alloc());
}
uint8_t *new_private_data = (uint8_t *)std::malloc(capacity);
if (new_private_data == nullptr) {
MKXPZ_THROW(std::bad_alloc());
if (capacity != memory->capacity) {
std::free(memory->private_data);
if ((memory->private_data = (uint8_t *)std::malloc(capacity)) == nullptr) {
MKXPZ_THROW(std::bad_alloc());
}
memory->capacity = capacity;
}
memory->pages = size / WASM_PAGE_SIZE;
memory->size = size;
memory->capacity = capacity;
memory->private_data = new_private_data;
#ifdef MKXPZ_BIG_ENDIAN
memory->data = memory->private_data + std::max((size_t)memory->size, (size_t)WASM_MIN_PAGES * (size_t)WASM_PAGE_SIZE) - (size_t)memory->size;
#else