From 51343374a7b145c13f92c5b0ee946a84ef18efdc Mon Sep 17 00:00:00 2001 From: legendecas Date: Mon, 30 Sep 2019 09:42:58 +0800 Subject: [PATCH] n-api: add `napi_detach_arraybuffer` As ArrayBuffer#detach is an ecma spec operation ([Section 24.1.1.3](https://tc39.es/ecma262/#sec-detacharraybuffer)), it might be good to have it in N-API. Fixes https://github.com/nodejs/node/issues/29674 --- doc/api/n-api.md | 27 +++++++++++++++++++ src/js_native_api.h | 4 +++ src/js_native_api_types.h | 2 ++ src/js_native_api_v8.cc | 23 +++++++++++++++- test/js-native-api/test_typedarray/test.js | 18 +++++++++++++ .../test_typedarray/test_typedarray.c | 19 +++++++++++++ 6 files changed, 92 insertions(+), 1 deletion(-) diff --git a/doc/api/n-api.md b/doc/api/n-api.md index d0bd46e790f737..f3ed8a447e78dd 100644 --- a/doc/api/n-api.md +++ b/doc/api/n-api.md @@ -371,6 +371,8 @@ typedef enum { napi_closing, napi_bigint_expected, napi_date_expected, + napi_arraybuffer_expected, + napi_detachable_arraybuffer_expected, } napi_status; ``` @@ -3148,6 +3150,30 @@ Returns `napi_ok` if the API succeeded. This API represents the invocation of the Strict Equality algorithm as defined in [Section 7.2.14][] of the ECMAScript Language Specification. +### napi_detach_arraybuffer + + +```C +napi_status napi_detach_arraybuffer(napi_env env, + napi_value arraybuffer) +``` + +* `[in] env`: The environment that the API is invoked under. +* `[in] arraybuffer`: The JavaScript `ArrayBuffer` to be detached. + +Returns `napi_ok` if the API succeeded. If a non-detachable `ArrayBuffer` is +passed in it returns `napi_detachable_arraybuffer_expected`. + +Generally, an `ArrayBuffer` is non-detachable if it has been detached before. +The engine may impose additional conditions on whether an `ArrayBuffer` is +detachable. For example, V8 requires that the `ArrayBuffer` be external, +that is, created with [`napi_create_external_arraybuffer`][]. + +This API represents the invocation of the `ArrayBuffer` detach operation as +defined in [Section 24.1.1.3][] of the ECMAScript Language Specification. + ## Working with JavaScript Properties N-API exposes a set of APIs to get and set properties on JavaScript @@ -5144,6 +5170,7 @@ This API may only be called from the main thread. [Section 22.1.4.1]: https://tc39.github.io/ecma262/#sec-properties-of-array-instances-length [Section 22.2]: https://tc39.github.io/ecma262/#sec-typedarray-objects [Section 24.1]: https://tc39.github.io/ecma262/#sec-arraybuffer-objects +[Section 24.1.1.3]: https://tc39.es/ecma262/#sec-detacharraybuffer [Section 24.3]: https://tc39.github.io/ecma262/#sec-dataview-objects [Section 25.4]: https://tc39.github.io/ecma262/#sec-promise-objects [`Number.MIN_SAFE_INTEGER`]: https://tc39.github.io/ecma262/#sec-number.min_safe_integer diff --git a/src/js_native_api.h b/src/js_native_api.h index 162c816517c388..cf1596be80e5b1 100644 --- a/src/js_native_api.h +++ b/src/js_native_api.h @@ -514,6 +514,10 @@ NAPI_EXTERN napi_status napi_set_instance_data(napi_env env, NAPI_EXTERN napi_status napi_get_instance_data(napi_env env, void** data); + +// ArrayBuffer detaching +NAPI_EXTERN napi_status napi_detach_arraybuffer(napi_env env, + napi_value arraybuffer); #endif // NAPI_EXPERIMENTAL EXTERN_C_END diff --git a/src/js_native_api_types.h b/src/js_native_api_types.h index ae8fedb1463787..a81e76a64934de 100644 --- a/src/js_native_api_types.h +++ b/src/js_native_api_types.h @@ -80,6 +80,8 @@ typedef enum { napi_closing, napi_bigint_expected, napi_date_expected, + napi_arraybuffer_expected, + napi_detachable_arraybuffer_expected, } napi_status; // Note: when adding a new enum value to `napi_status`, please also update // `const int last_status` in `napi_get_last_error_info()' definition, diff --git a/src/js_native_api_v8.cc b/src/js_native_api_v8.cc index a87af79a890832..daf55de07427d1 100644 --- a/src/js_native_api_v8.cc +++ b/src/js_native_api_v8.cc @@ -665,6 +665,8 @@ const char* error_messages[] = {nullptr, "Thread-safe function handle is closing", "A bigint was expected", "A date was expected", + "An arraybuffer was expected", + "A detachable arraybuffer was expected", }; napi_status napi_get_last_error_info(napi_env env, @@ -676,7 +678,7 @@ napi_status napi_get_last_error_info(napi_env env, // message in the `napi_status` enum each time a new error message is added. // We don't have a napi_status_last as this would result in an ABI // change each time a message was added. - const int last_status = napi_date_expected; + const int last_status = napi_detachable_arraybuffer_expected; static_assert( NAPI_ARRAYSIZE(error_messages) == last_status + 1, @@ -2997,3 +2999,22 @@ napi_status napi_get_instance_data(napi_env env, return napi_clear_last_error(env); } + +napi_status napi_detach_arraybuffer(napi_env env, napi_value arraybuffer) { + CHECK_ENV(env); + CHECK_ARG(env, arraybuffer); + + v8::Local value = v8impl::V8LocalValueFromJsValue(arraybuffer); + RETURN_STATUS_IF_FALSE( + env, value->IsArrayBuffer(), napi_arraybuffer_expected); + + v8::Local it = value.As(); + RETURN_STATUS_IF_FALSE( + env, it->IsExternal(), napi_detachable_arraybuffer_expected); + RETURN_STATUS_IF_FALSE( + env, it->IsDetachable(), napi_detachable_arraybuffer_expected); + + it->Detach(); + + return napi_clear_last_error(env); +} diff --git a/test/js-native-api/test_typedarray/test.js b/test/js-native-api/test_typedarray/test.js index 91e17ecbe8bb2a..5f51383254b7ab 100644 --- a/test/js-native-api/test_typedarray/test.js +++ b/test/js-native-api/test_typedarray/test.js @@ -74,3 +74,21 @@ nonByteArrayTypes.forEach((currentType) => { console.log(`start of offset ${currentType}`); }, RangeError); }); + +// Test detaching +arrayTypes.forEach((currentType) => { + const buffer = Reflect.construct(currentType, [8]); + assert.throws( + () => test_typedarray.Detach(buffer), + /A detachable arraybuffer was expected/); +}); +{ + const buffer = test_typedarray.External(); + assert.ok(externalResult instanceof Int8Array); + assert.strictEqual(externalResult.length, 3); + assert.strictEqual(externalResult.byteLength, 3); + test_typedarray.Detach(buffer); + assert.ok(externalResult instanceof Int8Array); + assert.strictEqual(buffer.length, 0); + assert.strictEqual(buffer.byteLength, 0); +} diff --git a/test/js-native-api/test_typedarray/test_typedarray.c b/test/js-native-api/test_typedarray/test_typedarray.c index 98480a4ea23e1f..9d7d394fca7c49 100644 --- a/test/js-native-api/test_typedarray/test_typedarray.c +++ b/test/js-native-api/test_typedarray/test_typedarray.c @@ -1,3 +1,4 @@ +#define NAPI_EXPERIMENTAL #include #include #include "../common.h" @@ -165,12 +166,30 @@ static napi_value CreateTypedArray(napi_env env, napi_callback_info info) { return output_array; } +static napi_value Detach(napi_env env, napi_callback_info info) { + size_t argc = 1; + napi_value args[1]; + NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL)); + NAPI_ASSERT(env, argc == 1, "Wrong number of arguments."); + + bool is_typedarray; + NAPI_CALL(env, napi_is_typedarray(env, args[0], &is_typedarray)); + NAPI_ASSERT(env, is_typedarray, "Wrong type of arguments. Expects a typedarray as first argument."); + + napi_value arraybuffer; + NAPI_CALL(env, napi_get_typedarray_info(env, args[0], NULL, NULL, NULL, &arraybuffer, NULL)); + NAPI_CALL(env, napi_detach_arraybuffer(env, arraybuffer)); + + return NULL; +} + EXTERN_C_START napi_value Init(napi_env env, napi_value exports) { napi_property_descriptor descriptors[] = { DECLARE_NAPI_PROPERTY("Multiply", Multiply), DECLARE_NAPI_PROPERTY("External", External), DECLARE_NAPI_PROPERTY("CreateTypedArray", CreateTypedArray), + DECLARE_NAPI_PROPERTY("Detach", Detach), }; NAPI_CALL(env, napi_define_properties(