v8/test/mjsunit/regress/regress-252797.js

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// Flags: --allow-natives-syntax --opt

// The type feedback oracle had a bug when retrieving the map from an IC
// starting with a negative lookup.

// Create a holder in fast mode.
var holder = Object.create({}, {
  holderMethod: {value: function() {}}
});
assertTrue(%HasFastProperties(holder));

// We assume dict usage for null prototype.
var holder = Object.create(null, {
  holderMethod: {value: function() {}}
});
assertFalse(%HasFastProperties(holder));

// Create a receiver into dictionary mode.
var receiver = Object.create(holder, {
  killMe: {value: 0, configurable: true},
  keepMe: {value: 0, configurable: true}
});
delete receiver.killMe;
assertFalse(%HasFastProperties(receiver));

// The actual function to test, triggering the retrieval of the wrong map.
function callConstantFunctionOnPrototype(obj) {
  obj.holderMethod();
}

callConstantFunctionOnPrototype(receiver);
callConstantFunctionOnPrototype(receiver);
%OptimizeFunctionOnNextCall(callConstantFunctionOnPrototype);
callConstantFunctionOnPrototype(receiver);

// Make sure that the function is still optimized.
assertOptimized(callConstantFunctionOnPrototype);