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Create trap for error message when wasm_instance_new fails (#1751)

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Create trap for error message when wasm_instance_new fails:
- Similar to [this PR](https://github.com/bytecodealliance/wasm-micro-runtime/pull/1526),
   but create a wasm_trap_t to output the error msg instead of adding error_buf to the API.
- Trap will need to be deleted by the caller but is not a breaking change as it is only
   created if trap is not NULL.
- Add error messages for all failure cases here, try to make them accurate but welcome
  feedback for improvements.

Signed-off-by: Andrew Chambers <ncham@amazon.com>
This commit is contained in:
Andy 2022-11-25 09:45:19 +00:00 committed by GitHub
parent 96570cca22
commit 1465901f6f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 37 additions and 10 deletions
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43
core/iwasm/common/wasm_c_api.c
View File

@ -4444,25 +4444,25 @@ failed:
wasm_instance_t *
wasm_instance_new(wasm_store_t *store, const wasm_module_t *module,
const wasm_extern_vec_t *imports, own wasm_trap_t **traps)
const wasm_extern_vec_t *imports, own wasm_trap_t **trap)
{
return wasm_instance_new_with_args(store, module, imports, traps,
return wasm_instance_new_with_args(store, module, imports, trap,
KILOBYTE(32), KILOBYTE(32));
}
wasm_instance_t *
wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
const wasm_extern_vec_t *imports,
own wasm_trap_t **traps, const uint32 stack_size,
own wasm_trap_t **trap, const uint32 stack_size,
const uint32 heap_size)
{
char error_buf[128] = { 0 };
char sub_error_buf[128] = { 0 };
char error_buf[256] = { 0 };
uint32 import_count = 0;
bool import_count_verified = false;
wasm_instance_t *instance = NULL;
uint32 i = 0;
bool processed = false;
(void)traps;
bh_assert(singleton_engine);
@ -4474,6 +4474,8 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
instance = malloc_internal(sizeof(wasm_instance_t));
if (!instance) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Failed to malloc instance");
goto failed;
}
@ -4490,6 +4492,8 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
/* make sure a complete import list */
if ((int32)import_count < 0
|| import_count != actual_link_import_count) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Failed to validate imports");
goto failed;
}
}
@ -4508,6 +4512,8 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
import_count = aot_link(instance, MODULE_AOT(module),
(wasm_extern_t **)imports->data);
if ((int32)import_count < 0) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Failed to validate imports");
goto failed;
}
}
@ -4520,18 +4526,21 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
* also leads to below branch
*/
if (!import_count_verified) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Failed to verify import count");
goto failed;
}
}
instance->inst_comm_rt = wasm_runtime_instantiate(
*module, stack_size, heap_size, error_buf, sizeof(error_buf));
*module, stack_size, heap_size, sub_error_buf, sizeof(sub_error_buf));
if (!instance->inst_comm_rt) {
LOG_ERROR(error_buf);
goto failed;
}
if (!wasm_runtime_create_exec_env_singleton(instance->inst_comm_rt)) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Failed to create exec env singleton");
goto failed;
}
@ -4556,6 +4565,8 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
instance->inst_comm_rt;
break;
default:
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Unknown import kind");
goto failed;
}
}
@ -4572,6 +4583,8 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
if (!interp_process_export(store,
(WASMModuleInstance *)instance->inst_comm_rt,
instance->exports)) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Interpreter failed to process exports");
goto failed;
}
@ -4594,6 +4607,8 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
if (!aot_process_export(store,
(AOTModuleInstance *)instance->inst_comm_rt,
instance->exports)) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"AOT failed to process exports");
goto failed;
}
@ -4606,11 +4621,15 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
* leads to below branch
*/
if (!processed) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Incorrect filetype and compilation flags");
goto failed;
}
/* add it to a watching list in store */
if (!bh_vector_append((Vector *)store->instances, &instance)) {
snprintf(sub_error_buf, sizeof(sub_error_buf),
"Failed to add to store instances");
goto failed;
}
@ -4619,7 +4638,15 @@ wasm_instance_new_with_args(wasm_store_t *store, const wasm_module_t *module,
return instance;
failed:
LOG_DEBUG("%s failed", __FUNCTION__);
snprintf(error_buf, sizeof(error_buf), "%s failed: %s", __FUNCTION__,
sub_error_buf);
if (trap != NULL) {
wasm_message_t message = { 0 };
wasm_name_new_from_string(&message, error_buf);
*trap = wasm_trap_new(store, &message);
wasm_byte_vec_delete(&message);
}
LOG_DEBUG(error_buf);
wasm_instance_delete_internal(instance);
return NULL;
}

4
core/iwasm/include/wasm_c_api.h
View File

@ -592,13 +592,13 @@ WASM_DECLARE_REF(instance)
WASM_API_EXTERN own wasm_instance_t* wasm_instance_new(
wasm_store_t*, const wasm_module_t*, const wasm_extern_vec_t *imports,
own wasm_trap_t**
own wasm_trap_t** trap
);
// please refer to wasm_runtime_instantiate(...) in core/iwasm/include/wasm_export.h
WASM_API_EXTERN own wasm_instance_t* wasm_instance_new_with_args(
wasm_store_t*, const wasm_module_t*, const wasm_extern_vec_t *imports,
own wasm_trap_t**, const uint32_t stack_size, const uint32_t heap_size
own wasm_trap_t** trap, const uint32_t stack_size, const uint32_t heap_size
);
WASM_API_EXTERN void wasm_instance_exports(const wasm_instance_t*, own wasm_extern_vec_t* out);