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n-api: add `napi_detach_arraybuffer` · nodejs/node@83e225b · GitHub

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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 #29674 PR-URL: #29768 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: David Carlier <devnexen@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>
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‎doc/api/n-api.md‎

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@@ -453,6 +453,8 @@ typedef enum {
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napi_closing,
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napi_bigint_expected,
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napi_date_expected,
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napi_arraybuffer_expected,
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napi_detachable_arraybuffer_expected,
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} napi_status;
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```
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@@ -3232,6 +3234,30 @@ Returns `napi_ok` if the API succeeded.
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This API represents the invocation of the Strict Equality algorithm as
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defined in [Section 7.2.14][] of the ECMAScript Language Specification.
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### napi_detach_arraybuffer
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<!-- YAML
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added: REPLACEME
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-->
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```C
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napi_status napi_detach_arraybuffer(napi_env env,
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napi_value arraybuffer)
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```
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* `[in] env`: The environment that the API is invoked under.
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* `[in] arraybuffer`: The JavaScript `ArrayBuffer` to be detached.
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Returns `napi_ok` if the API succeeded. If a non-detachable `ArrayBuffer` is
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passed in it returns `napi_detachable_arraybuffer_expected`.
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Generally, an `ArrayBuffer` is non-detachable if it has been detached before.
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The engine may impose additional conditions on whether an `ArrayBuffer` is
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detachable. For example, V8 requires that the `ArrayBuffer` be external,
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that is, created with [`napi_create_external_arraybuffer`][].
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This API represents the invocation of the `ArrayBuffer` detach operation as
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defined in [Section 24.1.1.3][] of the ECMAScript Language Specification.
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## Working with JavaScript Properties
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N-API exposes a set of APIs to get and set properties on JavaScript
@@ -5216,6 +5242,7 @@ This API may only be called from the main thread.
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[Section 22.1]: https://tc39.github.io/ecma262/#sec-array-objects
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[Section 22.2]: https://tc39.github.io/ecma262/#sec-typedarray-objects
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[Section 24.1]: https://tc39.github.io/ecma262/#sec-arraybuffer-objects
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[Section 24.1.1.3]: https://tc39.es/ecma262/#sec-detacharraybuffer
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[Section 24.3]: https://tc39.github.io/ecma262/#sec-dataview-objects
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[Section 25.4]: https://tc39.github.io/ecma262/#sec-promise-objects
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[Section 6.1.4]: https://tc39.github.io/ecma262/#sec-ecmascript-language-types-string-type

‎src/js_native_api.h‎

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@@ -514,6 +514,10 @@ NAPI_EXTERN napi_status napi_set_instance_data(napi_env env,
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NAPI_EXTERN napi_status napi_get_instance_data(napi_env env,
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void** data);
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// ArrayBuffer detaching
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NAPI_EXTERN napi_status napi_detach_arraybuffer(napi_env env,
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napi_value arraybuffer);
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#endif // NAPI_EXPERIMENTAL
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EXTERN_C_END

‎src/js_native_api_types.h‎

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@@ -80,6 +80,8 @@ typedef enum {
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napi_closing,
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napi_bigint_expected,
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napi_date_expected,
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napi_arraybuffer_expected,
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napi_detachable_arraybuffer_expected,
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} napi_status;
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// Note: when adding a new enum value to `napi_status`, please also update
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// `const int last_status` in `napi_get_last_error_info()' definition,

‎src/js_native_api_v8.cc‎

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@@ -703,6 +703,8 @@ const char* error_messages[] = {nullptr,
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"Thread-safe function handle is closing",
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"A bigint was expected",
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"A date was expected",
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"An arraybuffer was expected",
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"A detachable arraybuffer was expected",
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};
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napi_status napi_get_last_error_info(napi_env env,
@@ -714,7 +716,7 @@ napi_status napi_get_last_error_info(napi_env env,
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// message in the `napi_status` enum each time a new error message is added.
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// We don't have a napi_status_last as this would result in an ABI
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// change each time a message was added.
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const int last_status = napi_date_expected;
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const int last_status = napi_detachable_arraybuffer_expected;
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static_assert(
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NAPI_ARRAYSIZE(error_messages) == last_status + 1,
@@ -3037,3 +3039,22 @@ napi_status napi_get_instance_data(napi_env env,
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return napi_clear_last_error(env);
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}
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napi_status napi_detach_arraybuffer(napi_env env, napi_value arraybuffer) {
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CHECK_ENV(env);
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CHECK_ARG(env, arraybuffer);
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v8::Local<v8::Value> value = v8impl::V8LocalValueFromJsValue(arraybuffer);
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RETURN_STATUS_IF_FALSE(
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env, value->IsArrayBuffer(), napi_arraybuffer_expected);
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v8::Local<v8::ArrayBuffer> it = value.As<v8::ArrayBuffer>();
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RETURN_STATUS_IF_FALSE(
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env, it->IsExternal(), napi_detachable_arraybuffer_expected);
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RETURN_STATUS_IF_FALSE(
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env, it->IsDetachable(), napi_detachable_arraybuffer_expected);
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it->Detach();
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return napi_clear_last_error(env);
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}

‎test/js-native-api/test_typedarray/test.js‎

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@@ -74,3 +74,21 @@ nonByteArrayTypes.forEach((currentType) => {
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console.log(`start of offset ${currentType}`);
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}, RangeError);
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});
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// Test detaching
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arrayTypes.forEach((currentType) => {
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const buffer = Reflect.construct(currentType, [8]);
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assert.throws(
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() => test_typedarray.Detach(buffer),
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/A detachable arraybuffer was expected/);
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});
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{
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const buffer = test_typedarray.External();
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assert.ok(externalResult instanceof Int8Array);
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assert.strictEqual(externalResult.length, 3);
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assert.strictEqual(externalResult.byteLength, 3);
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test_typedarray.Detach(buffer);
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assert.ok(externalResult instanceof Int8Array);
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assert.strictEqual(buffer.length, 0);
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assert.strictEqual(buffer.byteLength, 0);
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}

‎test/js-native-api/test_typedarray/test_typedarray.c‎

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@@ -1,3 +1,4 @@
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#define NAPI_EXPERIMENTAL
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#include <js_native_api.h>
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#include <string.h>
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#include "../common.h"
@@ -165,12 +166,30 @@ static napi_value CreateTypedArray(napi_env env, napi_callback_info info) {
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return output_array;
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}
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static napi_value Detach(napi_env env, napi_callback_info info) {
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size_t argc = 1;
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napi_value args[1];
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NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
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NAPI_ASSERT(env, argc == 1, "Wrong number of arguments.");
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bool is_typedarray;
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NAPI_CALL(env, napi_is_typedarray(env, args[0], &is_typedarray));
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NAPI_ASSERT(env, is_typedarray, "Wrong type of arguments. Expects a typedarray as first argument.");
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napi_value arraybuffer;
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NAPI_CALL(env, napi_get_typedarray_info(env, args[0], NULL, NULL, NULL, &arraybuffer, NULL));
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NAPI_CALL(env, napi_detach_arraybuffer(env, arraybuffer));
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return NULL;
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}
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EXTERN_C_START
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napi_value Init(napi_env env, napi_value exports) {
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napi_property_descriptor descriptors[] = {
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DECLARE_NAPI_PROPERTY("Multiply", Multiply),
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DECLARE_NAPI_PROPERTY("External", External),
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DECLARE_NAPI_PROPERTY("CreateTypedArray", CreateTypedArray),
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DECLARE_NAPI_PROPERTY("Detach", Detach),
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};
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NAPI_CALL(env, napi_define_properties(

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