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optimized Array.prototype.push

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Fabrice Bellard
2025-10-16 15:21:24 +02:00
parent 3e5f2bbe69
commit 9a421b3338
1 changed files with 25 additions and 0 deletions
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25
quickjs.c
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@@ -41533,6 +41533,31 @@ static JSValue js_array_push(JSContext *ctx, JSValueConst this_val,
int i;
int64_t len, from, newLen;
if (likely(JS_VALUE_GET_TAG(this_val) == JS_TAG_OBJECT && !unshift)) {
JSObject *p = JS_VALUE_GET_OBJ(this_val);
if (likely(p->class_id == JS_CLASS_ARRAY && p->fast_array &&
p->extensible &&
p->shape->proto == JS_VALUE_GET_OBJ(ctx->class_proto[JS_CLASS_ARRAY]) &&
ctx->std_array_prototype &&
JS_VALUE_GET_TAG(p->prop[0].u.value) == JS_TAG_INT &&
JS_VALUE_GET_INT(p->prop[0].u.value) == p->u.array.count &&
(get_shape_prop(p->shape)->flags & JS_PROP_WRITABLE) != 0)) {
/* fast case */
uint32_t new_len;
new_len = p->u.array.count + argc;
if (likely(new_len <= INT32_MAX)) {
if (unlikely(new_len > p->u.array.u1.size)) {
if (expand_fast_array(ctx, p, new_len))
return JS_EXCEPTION;
}
for(i = 0; i < argc; i++)
p->u.array.u.values[p->u.array.count + i] = JS_DupValue(ctx, argv[i]);
p->prop[0].u.value = JS_NewInt32(ctx, new_len);
p->u.array.count = new_len;
return JS_NewInt32(ctx, new_len);
}
}
}
obj = JS_ToObject(ctx, this_val);
if (js_get_length64(ctx, &len, obj))
goto exception;