Implement ArrayBuffer.prototype.transfer (#101)

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Divy Srivastava 2023-11-21 10:29:23 -08:00 committed by GitHub
parent 9e8d278161
commit 1fcb573e6b
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2 changed files with 62 additions and 1 deletions

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@ -47253,6 +47253,18 @@ static JSValue JS_ThrowTypeErrorDetachedArrayBuffer(JSContext *ctx)
return JS_ThrowTypeError(ctx, "ArrayBuffer is detached");
}
// #sec-get-arraybuffer.prototype.detached
static JSValue js_array_buffer_get_detached(JSContext *ctx,
JSValueConst this_val)
{
JSArrayBuffer *abuf = JS_GetOpaque2(ctx, this_val, JS_CLASS_ARRAY_BUFFER);
if (!abuf)
return JS_EXCEPTION;
if (abuf->shared)
return JS_ThrowTypeError(ctx, "detached called on SharedArrayBuffer");
return JS_NewBool(ctx, abuf->detached);
}
static JSValue js_array_buffer_get_byteLength(JSContext *ctx,
JSValueConst this_val,
int class_id)
@ -47325,6 +47337,52 @@ uint8_t *JS_GetArrayBuffer(JSContext *ctx, size_t *psize, JSValueConst obj)
return NULL;
}
// ES #sec-arraybuffer.prototype.transfer
static JSValue js_array_buffer_transfer(JSContext *ctx,
JSValueConst this_val,
int argc, JSValueConst *argv)
{
JSArrayBuffer *abuf;
uint64_t new_len, old_len;
uint8_t *bs, *new_bs;
abuf = JS_GetOpaque2(ctx, this_val, JS_CLASS_ARRAY_BUFFER);
if (!abuf)
return JS_EXCEPTION;
if (abuf->shared)
return JS_ThrowTypeError(ctx, "cannot transfer a SharedArrayBuffer");
if (argc < 1 || JS_IsUndefined(argv[0]))
new_len = abuf->byte_length;
else if (JS_ToIndex(ctx, &new_len, argv[0]))
return JS_EXCEPTION;
if (abuf->detached)
return JS_ThrowTypeErrorDetachedArrayBuffer(ctx);
/* create an empty AB */
if (new_len == 0) {
JS_DetachArrayBuffer(ctx, this_val);
return js_array_buffer_constructor2(ctx, JS_UNDEFINED, 0, JS_CLASS_ARRAY_BUFFER);
}
bs = abuf->data;
old_len = abuf->byte_length;
/* if length mismatch, realloc. Otherwise, use the same backing buffer. */
if (new_len != old_len) {
new_bs = js_realloc(ctx, bs, new_len);
if (!new_bs)
return JS_EXCEPTION;
bs = new_bs;
if (new_len > old_len)
memset(bs + old_len, 0, new_len - old_len);
}
/* neuter the backing buffer */
abuf->data = NULL;
abuf->byte_length = 0;
abuf->detached = TRUE;
return js_array_buffer_constructor3(ctx, JS_UNDEFINED, new_len,
JS_CLASS_ARRAY_BUFFER,
bs, abuf->free_func,
NULL, FALSE);
}
static JSValue js_array_buffer_slice(JSContext *ctx,
JSValueConst this_val,
int argc, JSValueConst *argv, int class_id)
@ -47393,7 +47451,10 @@ static JSValue js_array_buffer_slice(JSContext *ctx,
static const JSCFunctionListEntry js_array_buffer_proto_funcs[] = {
JS_CGETSET_MAGIC_DEF("byteLength", js_array_buffer_get_byteLength, NULL, JS_CLASS_ARRAY_BUFFER ),
JS_CGETSET_DEF("detached", js_array_buffer_get_detached, NULL ),
JS_CFUNC_MAGIC_DEF("slice", 2, js_array_buffer_slice, JS_CLASS_ARRAY_BUFFER ),
JS_CFUNC_DEF("transfer", 0, js_array_buffer_transfer ),
JS_CFUNC_DEF("transferToFixedLength", 0, js_array_buffer_transfer ),
JS_PROP_STRING_DEF("[Symbol.toStringTag]", "ArrayBuffer", JS_PROP_CONFIGURABLE ),
};

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@ -65,7 +65,7 @@ Array.prototype.flatten
Array.prototype.includes
Array.prototype.values
ArrayBuffer
arraybuffer-transfer=skip
arraybuffer-transfer
arrow-function
async-functions
async-iteration