n-api: simplify bigint-from-word creation

Gabriel Schulhof · addaleax · commit 02fe75026eed · 2020-09-22T19:54:45.000+02:00
Macro `CHECK_MAYBE_EMPTY_WITH_PREAMBLE()` does the work of checking the `TryCatch` and returning `napi_pending_exception` so this change reuses it for `napi_create_bigint_words()`. Signed-off-by: Gabriel Schulhof <gabriel.schulhof@intel.com> PR-URL: #34554 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
diff --git a/src/js_native_api_v8.cc b/src/js_native_api_v8.cc
@@ -1634,13 +1634,10 @@ napi_status napi_create_bigint_words(napi_env env,
   v8::MaybeLocal<v8::BigInt> b = v8::BigInt::NewFromWords(
       context, sign_bit, word_count, words);
 
-  if (try_catch.HasCaught()) {
-    return napi_set_last_error(env, napi_pending_exception);
-  } else {
-    CHECK_MAYBE_EMPTY(env, b, napi_generic_failure);
-    *result = v8impl::JsValueFromV8LocalValue(b.ToLocalChecked());
-    return napi_clear_last_error(env);
-  }
+  CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, b, napi_generic_failure);
+
+  *result = v8impl::JsValueFromV8LocalValue(b.ToLocalChecked());
+  return GET_RETURN_STATUS(env);
 }
 
 napi_status napi_get_boolean(napi_env env, bool value, napi_value* result) {
diff --git a/test/js-native-api/test_bigint/test.js b/test/js-native-api/test_bigint/test.js
@@ -7,6 +7,7 @@ const {
   TestUint64,
   TestWords,
   CreateTooBigBigInt,
+  MakeBigIntWordsThrow,
 } = require(`./build/${common.buildType}/test_bigint`);
 
 [
@@ -43,3 +44,9 @@ assert.throws(CreateTooBigBigInt, {
   name: 'Error',
   message: 'Invalid argument',
 });
+
+// Test that we correctly forward exceptions from the engine.
+assert.throws(MakeBigIntWordsThrow, {
+  name: 'RangeError',
+  message: 'Maximum BigInt size exceeded'
+});
diff --git a/test/js-native-api/test_bigint/test_bigint.c b/test/js-native-api/test_bigint/test_bigint.c
@@ -1,3 +1,4 @@
+#include <limits.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <js_native_api.h>
@@ -122,6 +123,22 @@ static napi_value CreateTooBigBigInt(napi_env env, napi_callback_info info) {
   return output;
 }
 
+// Test that we correctly forward exceptions from the engine.
+static napi_value MakeBigIntWordsThrow(napi_env env, napi_callback_info info) {
+  uint64_t words[10];
+  napi_value output;
+
+  napi_status status = napi_create_bigint_words(env,
+                                                0,
+                                                INT_MAX,
+                                                words,
+                                                &output);
+  if (status != napi_pending_exception)
+    napi_throw_error(env, NULL, "Expected status `napi_pending_exception`");
+
+  return NULL;
+}
+
 EXTERN_C_START
 napi_value Init(napi_env env, napi_value exports) {
   napi_property_descriptor descriptors[] = {
@@ -130,6 +147,7 @@ napi_value Init(napi_env env, napi_value exports) {
     DECLARE_NAPI_PROPERTY("TestUint64", TestUint64),
     DECLARE_NAPI_PROPERTY("TestWords", TestWords),
     DECLARE_NAPI_PROPERTY("CreateTooBigBigInt", CreateTooBigBigInt),
+    DECLARE_NAPI_PROPERTY("MakeBigIntWordsThrow", MakeBigIntWordsThrow),
   };
 
   NAPI_CALL(env, napi_define_properties(
