src/v8/test/mjsunit/regress/regress-crbug-719384.js

// Copyright 2017 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

(function TestThrowingObserver() {
  function Module(stdlib, foreign) {
    "use asm";
    var x = foreign.x | 0;
    function f() {}
    return { f:f };
  }
  var observer = { get x() { throw new Error() } };
  assertThrows(() => Module(this, observer));
  assertFalse(%IsAsmWasmCode(Module));
})();

(function TestMutatingObserver() {
  function Module(stdlib, foreign) {
    "use asm";
    var x = +foreign.x;
    var PI = stdlib.Math.PI;
    function f() {
      return +(PI + x);
    }
    return { f:f };
  }
  var stdlib = { Math : { PI : Math.PI } };
  var observer = { get x() { stdlib.Math.PI = 23; return 42; } };
  var m = Module(stdlib, observer);
  assertFalse(%IsAsmWasmCode(Module));
  assertEquals(65, m.f());
})();