v8/test/mjsunit/es6/map-constructor-entry-side-effect.js

// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

function TestMapConstructorEntrySideEffect(ctor) {
  const k1 = {};
  const k2 = {};
  const k3 = {};
  let callCount = 0;
  const input = [
    Object.defineProperty([, 1], "0", {
      get() {
        input.length = 2;
        return k1;
      }
    }),
    [k2, 2],
    Object.defineProperty([, 3], "0", {
      get() {
        callCount++;
        return k3;
      }
    })
  ];
  const col = new ctor(input);

  assertEquals(0, callCount);
  if ('size' in col) assertEquals(2, col.size);
  assertEquals(col.get(k1), 1);
  assertEquals(col.get(k2), 2);
  assertFalse(col.has(k3));
}

%PrepareFunctionForOptimization(TestMapConstructorEntrySideEffect);
TestMapConstructorEntrySideEffect(Map);
TestMapConstructorEntrySideEffect(Map);
TestMapConstructorEntrySideEffect(Map);
%OptimizeFunctionOnNextCall(TestMapConstructorEntrySideEffect);
TestMapConstructorEntrySideEffect(Map);
assertOptimized(TestMapConstructorEntrySideEffect);

TestMapConstructorEntrySideEffect(WeakMap);
%PrepareFunctionForOptimization(TestMapConstructorEntrySideEffect);
TestMapConstructorEntrySideEffect(WeakMap);
TestMapConstructorEntrySideEffect(WeakMap);
%OptimizeFunctionOnNextCall(TestMapConstructorEntrySideEffect);
TestMapConstructorEntrySideEffect(WeakMap);
assertOptimized(TestMapConstructorEntrySideEffect);