39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
description(
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"Tests that attempts by the DFG simplification to short-circuit a Phantom to a GetLocal on a variable that is SetLocal'd in the same block, and where the predecessor block(s) make no mention of that variable, do not result in crashes."
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);
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function baz() {
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// Do something that prevents inlining.
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return function() { }
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}
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function stuff(z) { }
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function foo(x, y) {
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var a = arguments; // Force arguments to be captured, so that x is captured.
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baz();
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var z = x;
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stuff(z); // Force a Flush, and then a Phantom on the GetLocal of x.
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return 42;
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}
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var o = {
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g: function(x) { }
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};
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function thingy(o) {
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var p = {};
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var result;
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// Trick to delay control flow graph simplification until after the flush of x above gets turned into a phantom.
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if (o.g)
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p.f = true;
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if (p.f) {
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// Basic block that stores to x in foo(), which is a captured variable, with
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// the predecessor block making no mention of x.
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result = foo("hello", 2);
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}
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return result;
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}
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dfgShouldBe(thingy, "thingy(o)", "42");
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