test/mjsunit/stack-traces.js

// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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function testMethodNameInference() {
  function Foo() { }
  Foo.prototype.bar = function () { FAIL; };
  (new Foo).bar();
}

function testNested() {
  function one() {
    function two() {
      function three() {
        FAIL;
      }
      three();
    }
    two();
  }
  one();
}

function testArrayNative() {
  [1, 2, 3].map(function () { FAIL; });
}

function testImplicitConversion() {
  function Nirk() { }
  Nirk.prototype.valueOf = function () { FAIL; };
  return 1 + (new Nirk);
}

function testEval() {
  eval("function Doo() { FAIL; }; Doo();");
}

function testNestedEval() {
  var x = "FAIL";
  eval("function Outer() { eval('function Inner() { eval(x); }'); Inner(); }; Outer();");
}

function testValue() {
  Number.prototype.causeError = function () { FAIL; };
  (1).causeError();
}

function testConstructor() {
  function Plonk() { FAIL; }
  new Plonk();
}

function testRenamedMethod() {
  function a$b$c$d() { return FAIL; }
  function Wookie() { }
  Wookie.prototype.d = a$b$c$d;
  (new Wookie).d();
}

function testAnonymousMethod() {
  (function () { FAIL }).call([1, 2, 3]);
}

function CustomError(message, stripPoint) {
  this.message = message;
  Error.captureStackTrace(this, stripPoint);
}

CustomError.prototype.toString = function () {
  return "CustomError: " + this.message;
};

function testDefaultCustomError() {
  throw new CustomError("hep-hey", undefined);
}

function testStrippedCustomError() {
  throw new CustomError("hep-hey", CustomError);
}

// Utility function for testing that the expected strings occur
// in the stack trace produced when running the given function.
function testTrace(name, fun, expected, unexpected) {
  var threw = false;
  try {
    fun();
  } catch (e) {
    for (var i = 0; i < expected.length; i++) {
      assertTrue(e.stack.indexOf(expected[i]) != -1,
                 name + " doesn't contain expected[" + i + "]");
    }
    if (unexpected) {
      for (var i = 0; i < unexpected.length; i++) {
        assertEquals(e.stack.indexOf(unexpected[i]), -1,
                     name + " contains unexpected[" + i + "]");
      }
    }
    threw = true;
  }
  assertTrue(threw, name + " didn't throw");
}

// Test that the error constructor is not shown in the trace
function testCallerCensorship() {
  var threw = false;
  try {
    FAIL;
  } catch (e) {
    assertEquals(-1, e.stack.indexOf('at new ReferenceError'),
                 "CallerCensorship contained new ReferenceError");
    threw = true;
  }
  assertTrue(threw, "CallerCensorship didn't throw");
}

// Test that the explicit constructor call is shown in the trace
function testUnintendedCallerCensorship() {
  var threw = false;
  try {
    new ReferenceError({
      toString: function () {
        FAIL;
      }
    });
  } catch (e) {
    assertTrue(e.stack.indexOf('at new ReferenceError') != -1,
               "UnintendedCallerCensorship didn't contain new ReferenceError");
    threw = true;
  }
  assertTrue(threw, "UnintendedCallerCensorship didn't throw");
}

// If an error occurs while the stack trace is being formatted it should
// be handled gracefully.
function testErrorsDuringFormatting() {
  function Nasty() { }
  Nasty.prototype.foo = function () { throw new RangeError(); };
  var n = new Nasty();
  n.__defineGetter__('constructor', function () { CONS_FAIL; });
  var threw = false;
  try {
    n.foo();
  } catch (e) {
    threw = true;
    assertTrue(e.stack.indexOf('<error: ReferenceError') != -1,
               "ErrorsDuringFormatting didn't contain error: ReferenceError");
  }
  assertTrue(threw, "ErrorsDuringFormatting didn't throw");
  threw = false;
  // Now we can't even format the message saying that we couldn't format
  // the stack frame.  Put that in your pipe and smoke it!
  ReferenceError.prototype.toString = function () { NESTED_FAIL; };
  try {
    n.foo();
  } catch (e) {
    threw = true;
    assertTrue(e.stack.indexOf('<error>') != -1,
               "ErrorsDuringFormatting didn't contain <error>");
  }
  assertTrue(threw, "ErrorsDuringFormatting didnt' throw (2)");
}


testTrace("testArrayNative", testArrayNative, ["Array.map (native)"]);
testTrace("testNested", testNested, ["at one", "at two", "at three"]);
testTrace("testMethodNameInference", testMethodNameInference, ["at Foo.bar"]);
testTrace("testImplicitConversion", testImplicitConversion, ["at Nirk.valueOf"]);
testTrace("testEval", testEval, ["at Doo (eval at testEval"]);
testTrace("testNestedEval", testNestedEval, ["eval at Inner (eval at Outer"]);
testTrace("testValue", testValue, ["at Number.causeError"]);
testTrace("testConstructor", testConstructor, ["new Plonk"]);
testTrace("testRenamedMethod", testRenamedMethod, ["Wookie.a$b$c$d [as d]"]);
testTrace("testAnonymousMethod", testAnonymousMethod, ["Array.<anonymous>"]);
testTrace("testDefaultCustomError", testDefaultCustomError,
    ["hep-hey", "new CustomError"],
    ["collectStackTrace"]);
testTrace("testStrippedCustomError", testStrippedCustomError, ["hep-hey"],
    ["new CustomError", "collectStackTrace"]);
testCallerCensorship();
testUnintendedCallerCensorship();
testErrorsDuringFormatting();