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Diffstat (limited to 'js/src/jit-test/tests/ion/object-keys-02.js')
-rw-r--r-- | js/src/jit-test/tests/ion/object-keys-02.js | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/object-keys-02.js b/js/src/jit-test/tests/ion/object-keys-02.js new file mode 100644 index 0000000000..077433431b --- /dev/null +++ b/js/src/jit-test/tests/ion/object-keys-02.js @@ -0,0 +1,54 @@ + +// This test case check some code frequently used in the wild, with some object +// (proxy) for which the optimization we have deployed do not work, as the +// assumption the Object.keys(...) can be elided without having noticeable +// side-effects. + +// Similar functions are part of popular framework such as React and Angular. +function shallowEqual(o1, o2) { + var k1 = Object.keys(o1); + var k2 = Object.keys(o2); + if (k1.length != k2.length) { + return false; + } + for (var k = 0; k < k1.length; k++) { + if (!Object.hasOwnProperty.call(o2, k1[k]) || !Object.is(o1[k1[k]], o2[k1[k]])) { + return false; + } + } + return true; +} + +let sideEffectCounter = 0; +const payload = {x: 5, a: 1, b: 2, c: 3, d: 4}; +const handler = { + ownKeys(target) { + // side-effect that should not be removed. + sideEffectCounter++; + // answer returned. + return Reflect.ownKeys(target); + }, +}; +const proxy = new Proxy(payload, handler); + +let objs = [ + {x:0, a: 1, b: 2}, + {x:1, b: 1, c: 2}, + {x:2, c: 1, d: 2}, + {x:3, a: 1, b: 2, c: 3}, + {x:4, b: 1, c: 2, d: 3}, + proxy +]; + +with({}) {} +let iterMax = 1000; +for (let i = 0; i < iterMax; i++) { + for (let o1 of objs) { + for (let o2 of objs) { + assertEq(shallowEqual(o1, o2), Object.is(o1, o2)); + } + } +} + +let expectedSideEffects = 2 * objs.length * iterMax; +assertEq(sideEffectCounter, expectedSideEffects); |