diff --git a/Source/JavaScriptCore/runtime/StackFrame.cpp b/Source/JavaScriptCore/runtime/StackFrame.cpp
new file mode 100644
index 0000000..ea7ec5e
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/StackFrame.cpp
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2016 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
+ * 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 "StackFrame.h"
+
+#include "CodeBlock.h"
+#include "DebuggerPrimitives.h"
+#include "JSCInlines.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace JSC {
+
+intptr_t StackFrame::sourceID() const
+{
+    if (!codeBlock)
+        return noSourceID;
+    return codeBlock->ownerScriptExecutable()->sourceID();
+}
+
+String StackFrame::sourceURL() const
+{
+    if (!codeBlock)
+        return ASCIILiteral("[native code]");
+
+    String sourceURL = codeBlock->ownerScriptExecutable()->sourceURL();
+    if (!sourceURL.isNull())
+        return sourceURL;
+    return emptyString();
+}
+
+String StackFrame::functionName(VM& vm) const
+{
+    if (codeBlock) {
+        switch (codeBlock->codeType()) {
+        case EvalCode:
+            return ASCIILiteral("eval code");
+        case ModuleCode:
+            return ASCIILiteral("module code");
+        case FunctionCode:
+            break;
+        case GlobalCode:
+            return ASCIILiteral("global code");
+        default:
+            ASSERT_NOT_REACHED();
+        }
+    }
+    String name;
+    if (callee)
+        name = getCalculatedDisplayName(vm, callee.get()).impl();
+    return name.isNull() ? emptyString() : name;
+}
+
+void StackFrame::computeLineAndColumn(unsigned& line, unsigned& column) const
+{
+    if (!codeBlock) {
+        line = 0;
+        column = 0;
+        return;
+    }
+
+    int divot = 0;
+    int unusedStartOffset = 0;
+    int unusedEndOffset = 0;
+    codeBlock->expressionRangeForBytecodeOffset(bytecodeOffset, divot, unusedStartOffset, unusedEndOffset, line, column);
+
+    ScriptExecutable* executable = codeBlock->ownerScriptExecutable();
+    if (executable->hasOverrideLineNumber())
+        line = executable->overrideLineNumber();
+}
+
+String StackFrame::toString(VM& vm) const
+{
+    StringBuilder traceBuild;
+    String functionName = this->functionName(vm);
+    String sourceURL = this->sourceURL();
+    traceBuild.append(functionName);
+    if (!sourceURL.isEmpty()) {
+        if (!functionName.isEmpty())
+            traceBuild.append('@');
+        traceBuild.append(sourceURL);
+        if (codeBlock) {
+            unsigned line;
+            unsigned column;
+            computeLineAndColumn(line, column);
+
+            traceBuild.append(':');
+            traceBuild.appendNumber(line);
+            traceBuild.append(':');
+            traceBuild.appendNumber(column);
+        }
+    }
+    return traceBuild.toString().impl();
+}
+
+} // namespace JSC
+