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diff --git a/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp b/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp
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+++ b/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp
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+/*
+ * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ExceptionHelpers.h"
+
+#include "CodeBlock.h"
+#include "CallFrame.h"
+#include "ErrorHandlingScope.h"
+#include "Exception.h"
+#include "JSGlobalObjectFunctions.h"
+#include "JSNotAnObject.h"
+#include "Interpreter.h"
+#include "Nodes.h"
+#include "JSCInlines.h"
+#include "RuntimeType.h"
+#include <wtf/text/StringBuilder.h>
+#include <wtf/text/StringView.h>
+
+namespace JSC {
+
+STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(TerminatedExecutionError);
+
+const ClassInfo TerminatedExecutionError::s_info = { "TerminatedExecutionError", &Base::s_info, 0, CREATE_METHOD_TABLE(TerminatedExecutionError) };
+
+JSValue TerminatedExecutionError::defaultValue(const JSObject*, ExecState* exec, PreferredPrimitiveType hint)
+{
+    if (hint == PreferString)
+        return jsNontrivialString(exec, String(ASCIILiteral("JavaScript execution terminated.")));
+    return JSValue(PNaN);
+}
+
+JSObject* createTerminatedExecutionException(VM* vm)
+{
+    return TerminatedExecutionError::create(*vm);
+}
+
+bool isTerminatedExecutionException(Exception* exception)
+{
+    return exception->value().inherits(TerminatedExecutionError::info());
+}
+
+JSObject* createStackOverflowError(ExecState* exec)
+{
+    return createRangeError(exec, ASCIILiteral("Maximum call stack size exceeded."));
+}
+
+JSObject* createUndefinedVariableError(ExecState* exec, const Identifier& ident)
+{
+    if (exec->propertyNames().isPrivateName(ident)) {
+        String message(makeString("Can't find private variable: @", exec->propertyNames().getPublicName(ident).string()));
+        return createReferenceError(exec, message);
+    }
+    String message(makeString("Can't find variable: ", ident.string()));
+    return createReferenceError(exec, message);
+}
+    
+JSString* errorDescriptionForValue(ExecState* exec, JSValue v)
+{
+    if (v.isString())
+        return jsNontrivialString(exec, makeString('"',  asString(v)->value(exec), '"'));
+    if (v.isObject()) {
+        CallData callData;
+        JSObject* object = asObject(v);
+        if (object->methodTable()->getCallData(object, callData) != CallTypeNone)
+            return exec->vm().smallStrings.functionString();
+        return jsString(exec, JSObject::calculatedClassName(object));
+    }
+    return v.toString(exec);
+}
+    
+static String defaultApproximateSourceError(const String& originalMessage, const String& sourceText)
+{
+    return makeString(originalMessage, " (near '...", sourceText, "...')");
+}
+
+static String defaultSourceAppender(const String& originalMessage, const String& sourceText, RuntimeType, ErrorInstance::SourceTextWhereErrorOccurred occurrence)
+{
+    if (occurrence == ErrorInstance::FoundApproximateSource)
+        return defaultApproximateSourceError(originalMessage, sourceText);
+
+    ASSERT(occurrence == ErrorInstance::FoundExactSource);
+    return makeString(originalMessage, " (evaluating '", sourceText, "')");
+}
+
+static String functionCallBase(const String& sourceText)
+{ 
+    // This function retrieves the 'foo.bar' substring from 'foo.bar(baz)'.
+    // FIXME: This function has simple processing of /* */ style comments.
+    // It doesn't properly handle embedded comments of string literals that contain
+    // parenthesis or comment constructs, e.g. foo.bar("/abc\)*/").
+    // https://bugs.webkit.org/show_bug.cgi?id=146304
+
+    unsigned sourceLength = sourceText.length();
+    unsigned idx = sourceLength - 1;
+    if (sourceLength < 2 || sourceText[idx] != ')') {
+        // For function calls that have many new lines in between their open parenthesis
+        // and their closing parenthesis, the text range passed into the message appender 
+        // will not inlcude the text in between these parentheses, it will just be the desired
+        // text that precedes the parentheses.
+        return sourceText;
+    }
+
+    unsigned parenStack = 1;
+    bool isInMultiLineComment = false;
+    idx -= 1;
+    // Note that we're scanning text right to left instead of the more common left to right, 
+    // so syntax detection is backwards.
+    while (parenStack > 0) {
+        UChar curChar = sourceText[idx];
+        if (isInMultiLineComment)  {
+            if (idx > 0 && curChar == '*' && sourceText[idx - 1] == '/') {
+                isInMultiLineComment = false;
+                idx -= 1;
+            }
+        } else if (curChar == '(')
+            parenStack -= 1;
+        else if (curChar == ')')
+            parenStack += 1;
+        else if (idx > 0 && curChar == '/' && sourceText[idx - 1] == '*') {
+            isInMultiLineComment = true;
+            idx -= 1;
+        }
+
+        if (!idx)
+            break;
+
+        idx -= 1;
+    }
+
+    return sourceText.left(idx + 1);
+}
+
+static String notAFunctionSourceAppender(const String& originalMessage, const String& sourceText, RuntimeType type, ErrorInstance::SourceTextWhereErrorOccurred occurrence)
+{
+    ASSERT(type != TypeFunction);
+
+    if (occurrence == ErrorInstance::FoundApproximateSource)
+        return defaultApproximateSourceError(originalMessage, sourceText);
+
+    ASSERT(occurrence == ErrorInstance::FoundExactSource);
+    auto notAFunctionIndex = originalMessage.reverseFind("is not a function");
+    RELEASE_ASSERT(notAFunctionIndex != notFound);
+    StringView displayValue;
+    if (originalMessage.is8Bit()) 
+        displayValue = StringView(originalMessage.characters8(), notAFunctionIndex - 1);
+    else
+        displayValue = StringView(originalMessage.characters16(), notAFunctionIndex - 1);
+
+    String base = functionCallBase(sourceText);
+    StringBuilder builder;
+    builder.append(base);
+    builder.appendLiteral(" is not a function. (In '");
+    builder.append(sourceText);
+    builder.appendLiteral("', '");
+    builder.append(base);
+    builder.appendLiteral("' is ");
+    if (type == TypeObject)
+        builder.appendLiteral("an instance of ");
+    builder.append(displayValue);
+    builder.appendLiteral(")");
+
+    return builder.toString();
+}
+
+static String invalidParameterInSourceAppender(const String& originalMessage, const String& sourceText, RuntimeType type, ErrorInstance::SourceTextWhereErrorOccurred occurrence)
+{
+    ASSERT_UNUSED(type, type != TypeObject);
+
+    if (occurrence == ErrorInstance::FoundApproximateSource)
+        return defaultApproximateSourceError(originalMessage, sourceText);
+
+    ASSERT(occurrence == ErrorInstance::FoundExactSource);
+    auto inIndex = sourceText.reverseFind("in");
+    RELEASE_ASSERT(inIndex != notFound);
+    if (sourceText.find("in") != inIndex)
+        return makeString(originalMessage, " (evaluating '", sourceText, "')");
+
+    static const unsigned inLength = 2;
+    String rightHandSide = sourceText.substring(inIndex + inLength).simplifyWhiteSpace();
+    return makeString(rightHandSide, " is not an Object. (evaluating '", sourceText, "')");
+}
+
+static String invalidParameterInstanceofSourceAppender(const String& originalMessage, const String& sourceText, RuntimeType, ErrorInstance::SourceTextWhereErrorOccurred occurrence)
+{
+    if (occurrence == ErrorInstance::FoundApproximateSource)
+        return defaultApproximateSourceError(originalMessage, sourceText);
+
+    ASSERT(occurrence == ErrorInstance::FoundExactSource);
+    auto instanceofIndex = sourceText.reverseFind("instanceof");
+    RELEASE_ASSERT(instanceofIndex != notFound);
+    if (sourceText.find("instanceof") != instanceofIndex)
+        return makeString(originalMessage, " (evaluating '", sourceText, "')");
+
+    static const unsigned instanceofLength = 10;
+    String rightHandSide = sourceText.substring(instanceofIndex + instanceofLength).simplifyWhiteSpace();
+    return makeString(rightHandSide, " is not a function. (evaluating '", sourceText, "')");
+}
+
+JSObject* createError(ExecState* exec, JSValue value, const String& message, ErrorInstance::SourceAppender appender)
+{
+    String errorMessage = makeString(errorDescriptionForValue(exec, value)->value(exec), ' ', message);
+    JSObject* exception = createTypeError(exec, errorMessage, appender, runtimeTypeForValue(value));
+    ASSERT(exception->isErrorInstance());
+    return exception;
+}
+
+JSObject* createInvalidFunctionApplyParameterError(ExecState* exec, JSValue value)
+{
+    JSObject* exception = createTypeError(exec, makeString("second argument to Function.prototype.apply must be an Array-like object"), defaultSourceAppender, runtimeTypeForValue(value));
+    ASSERT(exception->isErrorInstance());
+    return exception;
+}
+
+JSObject* createInvalidInParameterError(ExecState* exec, JSValue value)
+{
+    return createError(exec, value, makeString("is not an Object."), invalidParameterInSourceAppender);
+}
+
+JSObject* createInvalidInstanceofParameterError(ExecState* exec, JSValue value)
+{
+    return createError(exec, value, makeString("is not a function."), invalidParameterInstanceofSourceAppender);
+}
+
+JSObject* createNotAConstructorError(ExecState* exec, JSValue value)
+{
+    return createError(exec, value, ASCIILiteral("is not a constructor"), defaultSourceAppender);
+}
+
+JSObject* createNotAFunctionError(ExecState* exec, JSValue value)
+{
+    return createError(exec, value, ASCIILiteral("is not a function"), notAFunctionSourceAppender);
+}
+
+JSObject* createNotAnObjectError(ExecState* exec, JSValue value)
+{
+    return createError(exec, value, ASCIILiteral("is not an object"), defaultSourceAppender);
+}
+
+JSObject* createErrorForInvalidGlobalAssignment(ExecState* exec, const String& propertyName)
+{
+    return createReferenceError(exec, makeString("Strict mode forbids implicit creation of global property '", propertyName, '\''));
+}
+
+JSObject* createTDZError(ExecState* exec)
+{
+    return createReferenceError(exec, "Cannot access uninitialized variable.");
+}
+
+JSObject* throwOutOfMemoryError(ExecState* exec)
+{
+    return exec->vm().throwException(exec, createOutOfMemoryError(exec));
+}
+
+JSObject* throwStackOverflowError(ExecState* exec)
+{
+    VM& vm = exec->vm();
+    ErrorHandlingScope errorScope(vm);
+    return vm.throwException(exec, createStackOverflowError(exec));
+}
+
+JSObject* throwTerminatedExecutionException(ExecState* exec)
+{
+    VM& vm = exec->vm();
+    ErrorHandlingScope errorScope(vm);
+    return vm.throwException(exec, createTerminatedExecutionException(&vm));
+}
+
+} // namespace JSC