Implement ArrayBuffer.prototype.transfer (#101)
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2 changed files with 62 additions and 1 deletions
61
quickjs.c
61
quickjs.c
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@ -47253,6 +47253,18 @@ static JSValue JS_ThrowTypeErrorDetachedArrayBuffer(JSContext *ctx)
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return JS_ThrowTypeError(ctx, "ArrayBuffer is detached");
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}
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// #sec-get-arraybuffer.prototype.detached
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static JSValue js_array_buffer_get_detached(JSContext *ctx,
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JSValueConst this_val)
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{
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JSArrayBuffer *abuf = JS_GetOpaque2(ctx, this_val, JS_CLASS_ARRAY_BUFFER);
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if (!abuf)
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return JS_EXCEPTION;
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if (abuf->shared)
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return JS_ThrowTypeError(ctx, "detached called on SharedArrayBuffer");
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return JS_NewBool(ctx, abuf->detached);
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}
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static JSValue js_array_buffer_get_byteLength(JSContext *ctx,
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JSValueConst this_val,
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int class_id)
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@ -47325,6 +47337,52 @@ uint8_t *JS_GetArrayBuffer(JSContext *ctx, size_t *psize, JSValueConst obj)
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return NULL;
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}
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// ES #sec-arraybuffer.prototype.transfer
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static JSValue js_array_buffer_transfer(JSContext *ctx,
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JSValueConst this_val,
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int argc, JSValueConst *argv)
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{
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JSArrayBuffer *abuf;
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uint64_t new_len, old_len;
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uint8_t *bs, *new_bs;
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abuf = JS_GetOpaque2(ctx, this_val, JS_CLASS_ARRAY_BUFFER);
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if (!abuf)
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return JS_EXCEPTION;
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if (abuf->shared)
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return JS_ThrowTypeError(ctx, "cannot transfer a SharedArrayBuffer");
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if (argc < 1 || JS_IsUndefined(argv[0]))
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new_len = abuf->byte_length;
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else if (JS_ToIndex(ctx, &new_len, argv[0]))
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return JS_EXCEPTION;
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if (abuf->detached)
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return JS_ThrowTypeErrorDetachedArrayBuffer(ctx);
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/* create an empty AB */
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if (new_len == 0) {
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JS_DetachArrayBuffer(ctx, this_val);
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return js_array_buffer_constructor2(ctx, JS_UNDEFINED, 0, JS_CLASS_ARRAY_BUFFER);
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}
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bs = abuf->data;
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old_len = abuf->byte_length;
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/* if length mismatch, realloc. Otherwise, use the same backing buffer. */
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if (new_len != old_len) {
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new_bs = js_realloc(ctx, bs, new_len);
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if (!new_bs)
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return JS_EXCEPTION;
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bs = new_bs;
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if (new_len > old_len)
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memset(bs + old_len, 0, new_len - old_len);
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}
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/* neuter the backing buffer */
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abuf->data = NULL;
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abuf->byte_length = 0;
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abuf->detached = TRUE;
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return js_array_buffer_constructor3(ctx, JS_UNDEFINED, new_len,
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JS_CLASS_ARRAY_BUFFER,
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bs, abuf->free_func,
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NULL, FALSE);
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}
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static JSValue js_array_buffer_slice(JSContext *ctx,
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JSValueConst this_val,
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int argc, JSValueConst *argv, int class_id)
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@ -47393,7 +47451,10 @@ static JSValue js_array_buffer_slice(JSContext *ctx,
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static const JSCFunctionListEntry js_array_buffer_proto_funcs[] = {
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JS_CGETSET_MAGIC_DEF("byteLength", js_array_buffer_get_byteLength, NULL, JS_CLASS_ARRAY_BUFFER ),
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JS_CGETSET_DEF("detached", js_array_buffer_get_detached, NULL ),
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JS_CFUNC_MAGIC_DEF("slice", 2, js_array_buffer_slice, JS_CLASS_ARRAY_BUFFER ),
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JS_CFUNC_DEF("transfer", 0, js_array_buffer_transfer ),
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JS_CFUNC_DEF("transferToFixedLength", 0, js_array_buffer_transfer ),
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JS_PROP_STRING_DEF("[Symbol.toStringTag]", "ArrayBuffer", JS_PROP_CONFIGURABLE ),
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};
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@ -65,7 +65,7 @@ Array.prototype.flatten
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Array.prototype.includes
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Array.prototype.values
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ArrayBuffer
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arraybuffer-transfer=skip
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arraybuffer-transfer
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arrow-function
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async-functions
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async-iteration
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