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#include <js_native_api.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../common.h"
#include "../entry_point.h"
typedef struct {
int32_t finalize_count;
napi_ref js_func;
} FinalizerData;
static void finalizerOnlyCallback(node_api_basic_env env,
void* finalize_data,
void* finalize_hint) {
FinalizerData* data = (FinalizerData*)finalize_data;
int32_t count = ++data->finalize_count;
// It is safe to access instance data
NODE_API_BASIC_CALL_RETURN_VOID(env,
napi_get_instance_data(env, (void**)&data));
NODE_API_BASIC_ASSERT_RETURN_VOID(count = data->finalize_count,
"Expected to be the same FinalizerData");
}
static void finalizerCallingJSCallback(napi_env env,
void* finalize_data,
void* finalize_hint) {
napi_value js_func, undefined;
FinalizerData* data = (FinalizerData*)finalize_data;
NODE_API_CALL_RETURN_VOID(
env, napi_get_reference_value(env, data->js_func, &js_func));
NODE_API_CALL_RETURN_VOID(env, napi_get_undefined(env, &undefined));
NODE_API_CALL_RETURN_VOID(
env, napi_call_function(env, undefined, js_func, 0, NULL, NULL));
NODE_API_CALL_RETURN_VOID(env, napi_delete_reference(env, data->js_func));
data->js_func = NULL;
++data->finalize_count;
}
// Schedule async finalizer to run JavaScript-touching code.
static void finalizerWithJSCallback(node_api_basic_env env,
void* finalize_data,
void* finalize_hint) {
NODE_API_BASIC_CALL_RETURN_VOID(
env,
node_api_post_finalizer(
env, finalizerCallingJSCallback, finalize_data, finalize_hint));
}
static void finalizerWithFailedJSCallback(node_api_basic_env basic_env,
void* finalize_data,
void* finalize_hint) {
// Intentionally cast to a napi_env to test the fatal failure.
napi_env env = (napi_env)basic_env;
napi_value obj;
FinalizerData* data = (FinalizerData*)finalize_data;
++data->finalize_count;
NODE_API_CALL_RETURN_VOID(env, napi_create_object(env, &obj));
}
static napi_value addFinalizer(napi_env env, napi_callback_info info) {
size_t argc = 1;
napi_value argv[1] = {0};
FinalizerData* data;
NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, argv, NULL, NULL));
NODE_API_CALL(env, napi_get_instance_data(env, (void**)&data));
NODE_API_CALL(env,
napi_add_finalizer(
env, argv[0], data, finalizerOnlyCallback, NULL, NULL));
return NULL;
}
// This finalizer is going to call JavaScript from finalizer and succeed.
static napi_value addFinalizerWithJS(napi_env env, napi_callback_info info) {
size_t argc = 2;
napi_value argv[2] = {0};
napi_valuetype arg_type;
FinalizerData* data;
NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, argv, NULL, NULL));
NODE_API_CALL(env, napi_get_instance_data(env, (void**)&data));
NODE_API_CALL(env, napi_typeof(env, argv[1], &arg_type));
NODE_API_ASSERT(
env, arg_type == napi_function, "Expected function as the second arg");
NODE_API_CALL(env, napi_create_reference(env, argv[1], 1, &data->js_func));
NODE_API_CALL(env,
napi_add_finalizer(
env, argv[0], data, finalizerWithJSCallback, NULL, NULL));
return NULL;
}
// This finalizer is going to call JavaScript from finalizer and fail.
static napi_value addFinalizerFailOnJS(napi_env env, napi_callback_info info) {
size_t argc = 1;
napi_value argv[1] = {0};
FinalizerData* data;
NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, argv, NULL, NULL));
NODE_API_CALL(env, napi_get_instance_data(env, (void**)&data));
NODE_API_CALL(
env,
napi_add_finalizer(
env, argv[0], data, finalizerWithFailedJSCallback, NULL, NULL));
return NULL;
}
static napi_value getFinalizerCallCount(napi_env env, napi_callback_info info) {
size_t argc = 1;
napi_value argv[1];
FinalizerData* data;
napi_value result;
NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, argv, NULL, NULL));
NODE_API_CALL(env, napi_get_instance_data(env, (void**)&data));
NODE_API_CALL(env, napi_create_int32(env, data->finalize_count, &result));
return result;
}
static void finalizeData(napi_env env, void* data, void* hint) {
free(data);
}
EXTERN_C_START
napi_value Init(napi_env env, napi_value exports) {
FinalizerData* data = (FinalizerData*)malloc(sizeof(FinalizerData));
NODE_API_ASSERT(env, data != NULL, "Failed to allocate memory");
memset(data, 0, sizeof(FinalizerData));
NODE_API_CALL(env, napi_set_instance_data(env, data, finalizeData, NULL));
napi_property_descriptor descriptors[] = {
DECLARE_NODE_API_PROPERTY("addFinalizer", addFinalizer),
DECLARE_NODE_API_PROPERTY("addFinalizerWithJS", addFinalizerWithJS),
DECLARE_NODE_API_PROPERTY("addFinalizerFailOnJS", addFinalizerFailOnJS),
DECLARE_NODE_API_PROPERTY("getFinalizerCallCount",
getFinalizerCallCount)};
NODE_API_CALL(
env,
napi_define_properties(env,
exports,
sizeof(descriptors) / sizeof(*descriptors),
descriptors));
return exports;
}
EXTERN_C_END
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