v8/test/mjsunit/stack-traces-2.js

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// Flags: --builtins-in-stack-traces


// Poisonous object that throws a reference error if attempted converted to
// a primitive values.
var thrower = { valueOf: function() { FAIL; },
                toString: function() { FAIL; } };

// Tests that a native constructor function is included in the
// stack trace.
function testTraceNativeConstructor(nativeFunc) {
  var nativeFuncName = nativeFunc.name;
  try {
    new nativeFunc(thrower);
    assertUnreachable(nativeFuncName);
  } catch (e) {
    assertTrue(e.stack.indexOf(nativeFuncName) >= 0, nativeFuncName);
  }
}

// Tests that a native conversion function is included in the
// stack trace.
function testTraceNativeConversion(nativeFunc) {
  var nativeFuncName = nativeFunc.name;
  try {
    nativeFunc(thrower);
    assertUnreachable(nativeFuncName);
  } catch (e) {
    assertTrue(e.stack.indexOf(nativeFuncName) >= 0, nativeFuncName);
  }
}


function testNotOmittedBuiltin(throwing, included) {
  try {
    throwing();
    assertUnreachable(included);
  } catch (e) {
    assertTrue(e.stack.indexOf(included) >= 0, included);
  }
}


testTraceNativeConversion(String);  // Does ToString on argument.
testTraceNativeConversion(Number);  // Does ToNumber on argument.
testTraceNativeConversion(RegExp);  // Does ToString on argument.

testTraceNativeConstructor(String);  // Does ToString on argument.
testTraceNativeConstructor(Number);  // Does ToNumber on argument.
testTraceNativeConstructor(RegExp);  // Does ToString on argument.
testTraceNativeConstructor(Date);    // Does ToNumber on argument.

// QuickSort has builtins object as receiver, and is non-native
// builtin. Should not be omitted with the --builtins-in-stack-traces flag.
testNotOmittedBuiltin(function(){ [thrower, 2].sort(function (a,b) {
                                                     (b < a) - (a < b); });
                      }, "QuickSort");

// Not omitted even though ADD from runtime.js is a non-native builtin.
testNotOmittedBuiltin(function(){ thrower + 2; }, "ADD");