1// Copyright 2010 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
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15//
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26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --allow-natives-syntax
29
30// Regression test for failure to deoptimize properly when the most recent
31// side effect occurred in a comma expression in an effect context.
32
33// An unoptimizable function, calling it is a side effect.
34function side_effect() { try {} finally {} return "wrong"; }
35
36// A function to observe the value of its first argument.
37function observe(x, y) { try {} finally {} return x; }
38
39// If we optimize for x a smi, then x a string will deopt.  The side effect
40// immediately before the deopt is in a comma expresion in an effect context
41// (i.e., itself the left subexpression of a comma expression).
42function test(x) { return observe(this, ((0, side_effect()), x + 1)); }
43
44// Run test enough times to get it optimized.
45for (var i = 0; i < 5; ++i) test(0);
46%OptimizeFunctionOnNextCall(test);
47test(0);
48
49// Force test to deopt.  If it behaves normally, it should return the global
50// object.  If the value of the call to side_effect() is lingering after the
51// deopt, it will return the string "wrong".
52assertFalse(test("a") === "wrong");
53