v8/test/mjsunit/regress/regress-crbug-465298.js

// Copyright 2015 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: --noturbo-osr --expose-debug-as debug

var stdlib = this;
var buffer = new ArrayBuffer(64 * 1024);
var foreign = { thrower: thrower, debugme: debugme }

// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug;

var listenerCalled = false;
function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      var frame = exec_state.frame(1);
      assertEquals(m.foo, frame.func().value());
      listenerCalled = true;
    }
  } catch (e) {
    print("Caught: " + e + " " + e.stack);
  };
}

function thrower() { throw "boom"; }
function debugme() { Debug.setListener(listener); debugger; }

function Module(stdlib, foreign, heap) {
  "use asm";
  var thrower = foreign.thrower;
  var debugme = foreign.debugme;
  function foo(i) {
    i = i|0;
    var a = 101;  // Local variables exist ...
    var b = 102;  // ... to make the debugger ...
    var c = 103;  // ... inspect them during break.
    if (i > 0) {
      debugme();
      i = 23;
    } else {
      thrower();
      i = 42;
    }
    return i|0;
  }
  return { foo: foo };
}

var m = Module(stdlib, foreign, buffer);

assertThrows("m.foo(0)");
assertEquals(23, m.foo(1));
assertTrue(listenerCalled);