v8/test/mjsunit/regress/regress-crbug-242502.js

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//
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// Flags: --expose-gc --allow-natives-syntax

function f() {
  return 23;
}

function call(o) {
  return o['']();
};
%PrepareFunctionForOptimization(call);
function test() {
  var o1 = %ToFastProperties(Object.create({foo: 1}, {'': {value: f}}));
  var o2 = %ToFastProperties(Object.create({bar: 1}, {'': {value: f}}));
  var o3 = %ToFastProperties(Object.create({baz: 1}, {'': {value: f}}));
  var o4 = %ToFastProperties(Object.create({qux: 1}, {'': {value: f}}));
  var o5 = %ToFastProperties(Object.create({loo: 1}, {'': {value: f}}));
  // Called twice on o1 to turn monomorphic.
  assertEquals(23, call(o1));
  assertEquals(23, call(o1));
  // Called on four other objects to turn megamorphic.
  assertEquals(23, call(o2));
  assertEquals(23, call(o3));
  assertEquals(23, call(o4));
  assertEquals(23, call(o5));
  return o1;
}

// Fill stub cache with entries.
test();

// Clear stub cache during GC.
gc();

// Turn IC megamorphic again.
var oboom = test();

// Optimize with previously cleared stub cache.
%OptimizeFunctionOnNextCall(call);
assertEquals(23, call(oboom));