• bmeurer's avatar
    [turbofan] Avoid allocating rest parameters for spread calls. · bfa319e5
    bmeurer authored
    We already had an optimization to turn Function.prototype.apply with
    arguments object, i.e.
    
      function foo() { return bar.apply(this, arguments); }
    
    into a special operator JSCallForwardVarargs, which avoids the
    allocation and deconstruction of the arguments object, but just passes
    along the incoming parameters. We can do the same for rest parameters
    and spread calls/constructs, i.e.
    
      class A extends B {
        constructor(...args) { super(...args); }
      }
    
    or
    
      function foo(...args) { return bar(1, 2, 3, ...args); }
    
    where we basically pass along the parameters (plus maybe additional
    statically known parameters).
    
    For this, we introduce a new JSConstructForwardVarargs operator and
    generalize the CallForwardVarargs builtins that are backing this.
    
    BUG=v8:6407,v8:6278,v8:6344
    R=jarin@chromium.org
    
    Review-Url: https://codereview.chromium.org/2890023004
    Cr-Commit-Position: refs/heads/master@{#45388}
    bfa319e5
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