v8/test/mjsunit/regress/regress-7115.js
Frank Emrich c9b4f3c4a7 [dict-proto] TF support for constants in dictionary mode protos, pt. 4
This CL is part of a  series that implements Turbofan support for
property accesses satisfying the following conditions:
1. The holder is a dictionary mode object.
2. The holder is a prototype.
3. The access is a load.

This feature will only be enabled if the build flag
v8_dict_property_const_tracking is set.

This particular CL modifies existing mjsunit tests whose assumptions
don't hold if v8_dict_property_const_tracking is enabled. This is
done by adding special handling for the case that
%IsDictPropertyConstTrackingEnabled() holds.

Bug: v8:11248
Change-Id: Ia36be73e4659a988b2471f0c8151b0442f3a98f5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2780292
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73745}
2021-03-31 14:53:45 +00:00

47 lines
1.8 KiB
JavaScript

// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
function TestBuiltinSubclassing(Builtin) {
if (!%IsDictPropertyConstTrackingEnabled()) {
// TODO(v8:11248) In the current implementation of
// v8_dict_property_const_tracking, prototypes are converted to dictionary
// mode in many places, but we don't guarantee that they are *created* as
// dictionary mode objects, yet. This will be fixed in the future. Until
// then, if v8_dict_property_const_tracking is enabled, we cannot always
// know for sure if a builtin has been converted already or not.
assertTrue(%HasFastProperties(Builtin));
}
assertTrue(%HasFastProperties(Builtin.prototype));
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(Builtin.prototype.__proto__));
class SubClass extends Builtin {}
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(Builtin));
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(Builtin.prototype));
assertEquals(!%IsDictPropertyConstTrackingEnabled(),
%HasFastProperties(Builtin.prototype.__proto__));
}
let TypedArray = Uint8Array.__proto__;
TestBuiltinSubclassing(RegExp);
TestBuiltinSubclassing(Promise);
TestBuiltinSubclassing(Array);
TestBuiltinSubclassing(TypedArray);
TestBuiltinSubclassing(Uint8Array);
TestBuiltinSubclassing(Int8Array);
TestBuiltinSubclassing(Uint16Array);
TestBuiltinSubclassing(Int16Array);
TestBuiltinSubclassing(Uint32Array);
TestBuiltinSubclassing(Int32Array);
TestBuiltinSubclassing(Float32Array);
TestBuiltinSubclassing(Float64Array);
TestBuiltinSubclassing(Uint8ClampedArray);