Add callback to handle memory.grow failures (#2522)
When embedding WAMR, this PR allows to register a callback that is invoked when memory.grow fails. In case of memory allocation failures, some languages allow to handle the error (e.g. by checking the return code of malloc/calloc in C), some others (e.g. Rust) just panic.
This commit is contained in:
Enrico Loparco
@ -8,6 +8,7 @@
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#include "../aot/aot_runtime.h"
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#include "bh_platform.h"
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#include "mem_alloc.h"
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#include "wasm_memory.h"
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#if WASM_ENABLE_SHARED_MEMORY != 0
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#include "../common/wasm_shared_memory.h"
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@ -24,6 +25,8 @@ static Memory_Mode memory_mode = MEMORY_MODE_UNKNOWN;
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static mem_allocator_t pool_allocator = NULL;
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static enlarge_memory_error_callback_t enlarge_memory_error_cb;
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#if WASM_MEM_ALLOC_WITH_USER_DATA != 0
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static void *allocator_user_data = NULL;
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static void *(*malloc_func)(void *user_data, unsigned int size) = NULL;
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@ -570,13 +573,16 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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{
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WASMMemoryInstance *memory = wasm_get_default_memory(module);
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uint8 *memory_data_old, *memory_data_new, *heap_data_old;
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uint32 num_bytes_per_page, heap_size, total_size_old;
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uint32 num_bytes_per_page, heap_size, total_size_old = 0;
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uint32 cur_page_count, max_page_count, total_page_count;
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uint64 total_size_new;
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bool ret = true;
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enlarge_memory_error_reason_t failure_reason = INTERNAL_ERROR;
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if (!memory)
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return false;
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if (!memory) {
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ret = false;
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goto return_func;
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}
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heap_data_old = memory->heap_data;
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heap_size = (uint32)(memory->heap_data_end - memory->heap_data);
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@ -594,9 +600,15 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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/* No need to enlarge memory */
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return true;
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if (total_page_count < cur_page_count /* integer overflow */
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|| total_page_count > max_page_count) {
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return false;
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if (total_page_count < cur_page_count) { /* integer overflow */
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ret = false;
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goto return_func;
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}
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if (total_page_count > max_page_count) {
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failure_reason = MAX_SIZE_REACHED;
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ret = false;
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goto return_func;
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}
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bh_assert(total_size_new <= 4 * (uint64)BH_GB);
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@ -622,14 +634,16 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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if (heap_size > 0) {
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if (mem_allocator_is_heap_corrupted(memory->heap_handle)) {
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wasm_runtime_show_app_heap_corrupted_prompt();
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return false;
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ret = false;
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goto return_func;
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}
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}
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if (!(memory_data_new =
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wasm_runtime_realloc(memory_data_old, (uint32)total_size_new))) {
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if (!(memory_data_new = wasm_runtime_malloc((uint32)total_size_new))) {
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return false;
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ret = false;
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goto return_func;
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}
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if (memory_data_old) {
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bh_memcpy_s(memory_data_new, (uint32)total_size_new,
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@ -685,6 +699,26 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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os_writegsbase(memory_data_new);
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#endif
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return_func:
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if (!ret && enlarge_memory_error_cb) {
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WASMExecEnv *exec_env = NULL;
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#if WASM_ENABLE_INTERP != 0
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if (module->module_type == Wasm_Module_Bytecode)
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exec_env =
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((WASMModuleInstanceExtra *)module->e)->common.cur_exec_env;
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#endif
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#if WASM_ENABLE_AOT != 0
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if (module->module_type == Wasm_Module_AoT)
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exec_env =
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((AOTModuleInstanceExtra *)module->e)->common.cur_exec_env;
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#endif
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enlarge_memory_error_cb(inc_page_count, total_size_old, 0,
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failure_reason,
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(WASMModuleInstanceCommon *)module, exec_env);
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}
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return ret;
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}
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#else
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@ -692,12 +726,16 @@ bool
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wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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{
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WASMMemoryInstance *memory = wasm_get_default_memory(module);
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uint32 num_bytes_per_page, total_size_old;
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uint32 num_bytes_per_page, total_size_old = 0;
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uint32 cur_page_count, max_page_count, total_page_count;
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uint64 total_size_new;
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bool ret = true;
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enlarge_memory_error_reason_t failure_reason = INTERNAL_ERROR;
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if (!memory)
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return false;
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if (!memory) {
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ret = false;
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goto return_func;
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}
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num_bytes_per_page = memory->num_bytes_per_page;
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cur_page_count = memory->cur_page_count;
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@ -710,9 +748,15 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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/* No need to enlarge memory */
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return true;
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if (total_page_count < cur_page_count /* integer overflow */
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|| total_page_count > max_page_count) {
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return false;
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if (total_page_count < cur_page_count) { /* integer overflow */
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ret = false;
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goto return_func;
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}
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if (total_page_count > max_page_count) {
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failure_reason = MAX_SIZE_REACHED;
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ret = false;
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goto return_func;
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}
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bh_assert(total_size_new <= 4 * (uint64)BH_GB);
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@ -727,7 +771,8 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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if (!os_mem_commit(memory->memory_data_end,
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(uint32)total_size_new - total_size_old,
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MMAP_PROT_READ | MMAP_PROT_WRITE)) {
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return false;
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ret = false;
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goto return_func;
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}
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#endif
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@ -739,7 +784,8 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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os_mem_decommit(memory->memory_data_end,
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(uint32)total_size_new - total_size_old);
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#endif
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return false;
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ret = false;
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goto return_func;
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}
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/* The increased pages are filled with zero by the OS when os_mmap,
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@ -759,10 +805,37 @@ wasm_enlarge_memory_internal(WASMModuleInstance *module, uint32 inc_page_count)
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memory->mem_bound_check_16bytes.u64 = total_size_new - 16;
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#endif
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return true;
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return_func:
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if (!ret && enlarge_memory_error_cb) {
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WASMExecEnv *exec_env = NULL;
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#if WASM_ENABLE_INTERP != 0
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if (module->module_type == Wasm_Module_Bytecode)
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exec_env =
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((WASMModuleInstanceExtra *)module->e)->common.cur_exec_env;
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#endif
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#if WASM_ENABLE_AOT != 0
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if (module->module_type == Wasm_Module_AoT)
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exec_env =
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((AOTModuleInstanceExtra *)module->e)->common.cur_exec_env;
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#endif
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enlarge_memory_error_cb(inc_page_count, total_size_old, 0,
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failure_reason,
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(WASMModuleInstanceCommon *)module, exec_env);
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}
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return ret;
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}
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#endif /* end of OS_ENABLE_HW_BOUND_CHECK */
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void
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wasm_runtime_set_enlarge_mem_error_callback(
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const enlarge_memory_error_callback_t callback)
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{
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enlarge_memory_error_cb = callback;
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}
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bool
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wasm_enlarge_memory(WASMModuleInstance *module, uint32 inc_page_count)
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{
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