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

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// Flags: --allow-natives-syntax --no-always-opt
// Flags: --concurrent-recompilation --block-concurrent-recompilation
// Flags: --no-always-opt

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");
// Kick off recompilation.
assertEquals(1, f(o));
// Change the prototype chain after compile graph has been created.
o.__proto__.__proto__ = { bar: function() { return 2; } };
// At this point, concurrent recompilation thread has not yet done its job.
assertUnoptimized(f, "no sync");
// Let the background thread proceed.
%UnblockConcurrentRecompilation();
// Optimization eventually bails out due to map dependency.
assertUnoptimized(f, "sync");
assertEquals(2, f(o));
//Clear type info for stress runs.
%ClearFunctionTypeFeedback(f);