4dd45e115b
This CL also renames wrongly named test for v8:4173. BUG=v8:4121 LOG=Y Review URL: https://codereview.chromium.org/1353363002 Cr-Commit-Position: refs/heads/master@{#30879}
59 lines
1.9 KiB
JavaScript
59 lines
1.9 KiB
JavaScript
// Copyright 2015 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 Migrator(o) {
|
|
return o.foo;
|
|
}
|
|
function Loader(o) {
|
|
return o[0];
|
|
}
|
|
|
|
var first_smi_array = [1];
|
|
var second_smi_array = [2];
|
|
var first_object_array = ["first"];
|
|
var second_object_array = ["string"];
|
|
|
|
assertTrue(%HasFastSmiElements(first_smi_array));
|
|
assertTrue(%HasFastSmiElements(second_smi_array));
|
|
assertTrue(%HasFastObjectElements(first_object_array));
|
|
assertTrue(%HasFastObjectElements(second_object_array));
|
|
|
|
// Prepare identical transition chains for smi and object arrays.
|
|
first_smi_array.foo = 0;
|
|
second_smi_array.foo = 0;
|
|
first_object_array.foo = 0;
|
|
second_object_array.foo = 0;
|
|
|
|
// Collect type feedback for not-yet-deprecated original object array map.
|
|
for (var i = 0; i < 3; i++) Migrator(second_object_array);
|
|
|
|
// Blaze a migration trail for smi array maps.
|
|
// This marks the migrated smi array map as a migration target.
|
|
first_smi_array.foo = 0.5;
|
|
print(second_smi_array.foo);
|
|
|
|
// Deprecate original object array map.
|
|
// Use TryMigrate from deferred optimized code to migrate second object array.
|
|
first_object_array.foo = 0.5;
|
|
%OptimizeFunctionOnNextCall(Migrator);
|
|
Migrator(second_object_array);
|
|
|
|
// |second_object_array| now erroneously has a smi map.
|
|
// Optimized code assuming smi elements will expose this.
|
|
|
|
for (var i = 0; i < 3; i++) Loader(second_smi_array);
|
|
%OptimizeFunctionOnNextCall(Loader);
|
|
assertEquals("string", Loader(second_object_array));
|
|
|
|
// Any of the following checks will also fail:
|
|
assertTrue(%HasFastObjectElements(second_object_array));
|
|
assertFalse(%HasFastSmiElements(second_object_array));
|
|
assertTrue(%HaveSameMap(first_object_array, second_object_array));
|
|
assertFalse(%HaveSameMap(first_smi_array, second_object_array));
|
|
|
|
%ClearFunctionTypeFeedback(Loader);
|
|
%ClearFunctionTypeFeedback(Migrator);
|