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

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// Flags: --allow-natives-syntax
// Flags: --parallel-recompilation --parallel-recompilation-delay=50

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

function assertUnoptimized(fun) {
  assertTrue(%GetOptimizationStatus(fun) != 1);
}

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

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

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

%OptimizeFunctionOnNextCall(f, "parallel");
assertEquals(1, f(o));     // Trigger optimization.
assertUnoptimized(f);      // Optimization not yet done.
// Change the prototype chain during optimization to trigger map invalidation.
o.__proto__.__proto__ = { bar: function() { return 2; } };
%CompleteOptimization(f);  // Conclude optimization with...
assertUnoptimized(f);      // ... bailing out due to map dependency.
assertEquals(2, f(o));