v8/test/mjsunit/compiler/concurrent-proto-change.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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// Flags: --allow-natives-syntax --no-always-opt --concurrent-recompilation

if (!%IsConcurrentRecompilationSupported()) {
  print("Concurrent recompilation is disabled. Skipping this test.");
  quit();
}

function f(foo) { return foo.bar(); }

%PrepareFunctionForOptimization(f);

var o = {};
o.__proto__ = { __proto__: { bar: function() { return 1; } } };

assertEquals(1, f(o));
assertEquals(1, f(o));

%DisableOptimizationFinalization();
%OptimizeFunctionOnNextCall(f, "concurrent");
// Kick off recompilation.
assertEquals(1, f(o));
// Change the prototype chain after compile graph has been created.
%WaitForBackgroundOptimization();
o.__proto__.__proto__ = { bar: function() { return 2; } };
assertUnoptimized(f, "no sync");
%FinalizeOptimization();
// Optimization failed due to map dependency.
assertUnoptimized(f);
assertEquals(2, f(o));
// Clear type info for stress runs.
%ClearFunctionFeedback(f);