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

// Copyright 2013 the V8 project authors. All rights reserved.
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//
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// Flags: --allow-natives-syntax
// Flags: --concurrent-recompilation --concurrent-recompilation-delay=50

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

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

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

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

// Mark for concurrent optimization.
%OptimizeFunctionOnNextCall(f, "concurrent");
// Trigger optimization in the background thread.
assertEquals(1, f(o));
// While concurrent recompilation is running, optimization not yet done.
assertUnoptimized(f, "no sync");
// Change the prototype chain during optimization to trigger map invalidation.
o.__proto__.__proto__ = { bar: function() { return 2; } };
// Optimization eventually bails out due to map dependency.
assertUnoptimized(f, "sync");
assertEquals(2, f(o));