GV

GeezerVison

The World Wide Web, restored to 800 pixels of glory.

Home|About|Gaming cabinet|Archives|How it works|Starter sites

On this site

  • Sign in
  • ActionsCI/CD and automation
  • CodespacesCloud development environments
  • All Features
  • Documentation
  • Training
  • Certifications
  • Build with Copilot
  • Customize Copilot
  • Integrations
  • Trending repos
  • GitHub Sponsors
  • Developer articles
  • Enterprises

This view

  • Original page
  • New address

GeezerVison is showing github.com — n-api: add `napi_detach_arraybuffer` · nodejs/node@961598b

File tree

Expand file treeCollapse file tree
Open diff view settings
Filter options
  • doc/api
    • n-api.md
  • src
    • node_api.cc
    • node_api.h
    • node_api_types.h
  • test/addons-napi/test_typedarray
    • test.js
    • test_typedarray.c
Expand file treeCollapse file tree
Open diff view settings
Collapse file

‎doc/api/n-api.md‎

Copy file name to clipboardExpand all lines: doc/api/n-api.md
+27Lines changed: 27 additions & 0 deletions
  • Display the source diff
  • Display the rich diff
Original file line numberDiff line numberDiff line change
@@ -265,6 +265,8 @@ typedef enum {
265265
napi_closing,
266266
napi_bigint_expected,
267267
napi_date_expected,
268+
napi_arraybuffer_expected,
269+
napi_detachable_arraybuffer_expected,
268270
} napi_status;
269271
```
270272
If additional information is required upon an API returning a failed status,
@@ -2946,6 +2948,30 @@ defined in
29462948
[Section 7.2.14](https://tc39.github.io/ecma262/#sec-strict-equality-comparison)
29472949
of the ECMAScript Language Specification.
29482950

2951+
### napi_detach_arraybuffer
2952+
<!-- YAML
2953+
added: REPLACEME
2954+
-->
2955+
2956+
```C
2957+
napi_status napi_detach_arraybuffer(napi_env env,
2958+
napi_value arraybuffer)
2959+
```
2960+
2961+
* `[in] env`: The environment that the API is invoked under.
2962+
* `[in] arraybuffer`: The JavaScript `ArrayBuffer` to be detached.
2963+
2964+
Returns `napi_ok` if the API succeeded. If a non-detachable `ArrayBuffer` is
2965+
passed in it returns `napi_detachable_arraybuffer_expected`.
2966+
2967+
Generally, an `ArrayBuffer` is non-detachable if it has been detached before.
2968+
The engine may impose additional conditions on whether an `ArrayBuffer` is
2969+
detachable. For example, V8 requires that the `ArrayBuffer` be external,
2970+
that is, created with [`napi_create_external_arraybuffer`][].
2971+
2972+
This API represents the invocation of the `ArrayBuffer` detach operation as
2973+
defined in [Section 24.1.1.3][] of the ECMAScript Language Specification.
2974+
29492975
## Working with JavaScript Properties
29502976

29512977
N-API exposes a set of APIs to get and set properties on JavaScript
@@ -4889,6 +4915,7 @@ This API may only be called from the main thread.
48894915
[Section 22.1]: https://tc39.github.io/ecma262/#sec-array-objects
48904916
[Section 22.2]: https://tc39.github.io/ecma262/#sec-typedarray-objects
48914917
[Section 24.1]: https://tc39.github.io/ecma262/#sec-arraybuffer-objects
4918+
[Section 24.1.1.3]: https://tc39.es/ecma262/#sec-detacharraybuffer
48924919
[Section 24.3]: https://tc39.github.io/ecma262/#sec-dataview-objects
48934920
[Section 25.4]: https://tc39.github.io/ecma262/#sec-promise-objects
48944921
[Section 6.1.4]: https://tc39.github.io/ecma262/#sec-ecmascript-language-types-string-type
Collapse file

‎src/node_api.cc‎

Copy file name to clipboardExpand all lines: src/node_api.cc
+22-1Lines changed: 22 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1386,6 +1386,8 @@ const char* error_messages[] = {nullptr,
13861386
"Thread-safe function handle is closing",
13871387
"A bigint was expected",
13881388
"A date was expected",
1389+
"An arraybuffer was expected",
1390+
"A detachable arraybuffer was expected",
13891391
};
13901392

13911393
static inline napi_status napi_clear_last_error(napi_env env) {
@@ -1416,7 +1418,7 @@ napi_status napi_get_last_error_info(napi_env env,
14161418
// message in the `napi_status` enum each time a new error message is added.
14171419
// We don't have a napi_status_last as this would result in an ABI
14181420
// change each time a message was added.
1419-
const int last_status = napi_date_expected;
1421+
const int last_status = napi_detachable_arraybuffer_expected;
14201422

14211423
static_assert(
14221424
node::arraysize(error_messages) == last_status + 1,
@@ -4382,3 +4384,22 @@ napi_status napi_get_instance_data(napi_env env,
43824384

43834385
return napi_clear_last_error(env);
43844386
}
4387+
4388+
napi_status napi_detach_arraybuffer(napi_env env, napi_value arraybuffer) {
4389+
CHECK_ENV(env);
4390+
CHECK_ARG(env, arraybuffer);
4391+
4392+
v8::Local<v8::Value> value = v8impl::V8LocalValueFromJsValue(arraybuffer);
4393+
RETURN_STATUS_IF_FALSE(
4394+
env, value->IsArrayBuffer(), napi_arraybuffer_expected);
4395+
4396+
v8::Local<v8::ArrayBuffer> it = value.As<v8::ArrayBuffer>();
4397+
RETURN_STATUS_IF_FALSE(
4398+
env, it->IsExternal(), napi_detachable_arraybuffer_expected);
4399+
RETURN_STATUS_IF_FALSE(
4400+
env, it->IsNeuterable(), napi_detachable_arraybuffer_expected);
4401+
4402+
it->Neuter();
4403+
4404+
return napi_clear_last_error(env);
4405+
}
Collapse file

‎src/node_api.h‎

Copy file name to clipboardExpand all lines: src/node_api.h
+7Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -747,6 +747,13 @@ napi_get_all_property_names(napi_env env,
747747

748748
#endif // NAPI_VERSION >= 6
749749

750+
#ifdef NAPI_EXPERIMENTAL
751+
// ArrayBuffer detaching
752+
NAPI_EXTERN napi_status
753+
napi_detach_arraybuffer(napi_env env,
754+
napi_value arraybuffer);
755+
#endif // NAPI_EXPERIMENTAL
756+
750757
EXTERN_C_END
751758

752759
#endif // SRC_NODE_API_H_
Collapse file

‎src/node_api_types.h‎

Copy file name to clipboardExpand all lines: src/node_api_types.h
+2Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -83,6 +83,8 @@ typedef enum {
8383
napi_closing,
8484
napi_bigint_expected,
8585
napi_date_expected,
86+
napi_arraybuffer_expected,
87+
napi_detachable_arraybuffer_expected,
8688
} napi_status;
8789
// Note: when adding a new enum value to `napi_status`, please also update
8890
// `const int last_status` in `napi_get_last_error_info()' definition,
Collapse file

‎test/addons-napi/test_typedarray/test.js‎

Copy file name to clipboardExpand all lines: test/addons-napi/test_typedarray/test.js
+18Lines changed: 18 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -74,3 +74,21 @@ nonByteArrayTypes.forEach((currentType) => {
7474
console.log(`start of offset ${currentType}`);
7575
}, RangeError);
7676
});
77+
78+
// Test detaching
79+
arrayTypes.forEach((currentType) => {
80+
const buffer = Reflect.construct(currentType, [8]);
81+
assert.throws(
82+
() => test_typedarray.Detach(buffer),
83+
/A detachable arraybuffer was expected/);
84+
});
85+
{
86+
const buffer = test_typedarray.External();
87+
assert.ok(externalResult instanceof Int8Array);
88+
assert.strictEqual(externalResult.length, 3);
89+
assert.strictEqual(externalResult.byteLength, 3);
90+
test_typedarray.Detach(buffer);
91+
assert.ok(externalResult instanceof Int8Array);
92+
assert.strictEqual(buffer.length, 0);
93+
assert.strictEqual(buffer.byteLength, 0);
94+
}
Collapse file

‎test/addons-napi/test_typedarray/test_typedarray.c‎

Copy file name to clipboardExpand all lines: test/addons-napi/test_typedarray/test_typedarray.c
+19Lines changed: 19 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,4 @@
1+
#define NAPI_EXPERIMENTAL
12
#include <node_api.h>
23
#include <string.h>
34
#include "../common.h"
@@ -165,11 +166,29 @@ static napi_value CreateTypedArray(napi_env env, napi_callback_info info) {
165166
return output_array;
166167
}
167168

169+
static napi_value Detach(napi_env env, napi_callback_info info) {
170+
size_t argc = 1;
171+
napi_value args[1];
172+
NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
173+
NAPI_ASSERT(env, argc == 1, "Wrong number of arguments.");
174+
175+
bool is_typedarray;
176+
NAPI_CALL(env, napi_is_typedarray(env, args[0], &is_typedarray));
177+
NAPI_ASSERT(env, is_typedarray, "Wrong type of arguments. Expects a typedarray as first argument.");
178+
179+
napi_value arraybuffer;
180+
NAPI_CALL(env, napi_get_typedarray_info(env, args[0], NULL, NULL, NULL, &arraybuffer, NULL));
181+
NAPI_CALL(env, napi_detach_arraybuffer(env, arraybuffer));
182+
183+
return NULL;
184+
}
185+
168186
static napi_value Init(napi_env env, napi_value exports) {
169187
napi_property_descriptor descriptors[] = {
170188
DECLARE_NAPI_PROPERTY("Multiply", Multiply),
171189
DECLARE_NAPI_PROPERTY("External", External),
172190
DECLARE_NAPI_PROPERTY("CreateTypedArray", CreateTypedArray),
191+
DECLARE_NAPI_PROPERTY("Detach", Detach),
173192
};
174193

175194
NAPI_CALL(env, napi_define_properties(

0 commit comments

Comments
0 (0)
You are visitor 01402503 — GeezerVison does not store the pages you look up.
Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required.