• Zhang, Shiyu's avatar
    [runtime] Do not add shadowing key for end prototype · a2e86bf6
    Zhang, Shiyu authored
    Shadowing key is used to exclude non-enumerable keys when iterating
    over the prototype chain. This CL skips adding shadowing key for
    end prototype to improve for-in performance. It can improve the
    performance of below microbench by ~50%.
    
    Object.prototype.foo = function() {};
    let obj = {
    	a:0,
    	b:1
    };
    let start = Date.now();
    for (let i = 0; i<1e6; i++) {
    	for (var j in obj) {}
    }
    console.log(Date.now() - start);
    
    This CL also improves the score of JetStream2-tagcloud-SP case
    by 8% on IA Chromebook.
    
    Contributed by tao.pan@intel.com
    
    Change-Id: I456082c08bf70f1f450ff54f657cdab26eb7bc2b
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1781113Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
    Commit-Queue: Shiyu Zhang <shiyu.zhang@intel.com>
    Cr-Commit-Position: refs/heads/master@{#63587}
    a2e86bf6
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