diff --git a/Source/JavaScriptCore/dfg/DFGVariableEvent.cpp b/Source/JavaScriptCore/dfg/DFGVariableEvent.cpp
new file mode 100644
index 0000000..3e84a6b
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGVariableEvent.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2012 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 "DFGVariableEvent.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGFPRInfo.h"
+#include "DFGGPRInfo.h"
+
+namespace JSC { namespace DFG {
+
+void VariableEvent::dump(FILE* out) const
+{
+    switch (kind()) {
+    case Reset:
+        fprintf(out, "Reset");
+        break;
+    case BirthToFill:
+        dumpFillInfo("BirthToFill", out);
+        break;
+    case BirthToSpill:
+        dumpSpillInfo("BirthToSpill", out);
+        break;
+    case Fill:
+        dumpFillInfo("Fill", out);
+        break;
+    case Spill:
+        dumpSpillInfo("Spill", out);
+        break;
+    case Death:
+        fprintf(out, "Death(@%u)", nodeIndex());
+        break;
+    case MovHint:
+        fprintf(out, "MovHint(@%u, r%d)", nodeIndex(), operand());
+        break;
+    case SetLocalEvent:
+        fprintf(out, "SetLocal(r%d, %s)", operand(), dataFormatToString(dataFormat()));
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+        break;
+    }
+}
+
+void VariableEvent::dumpFillInfo(const char* name, FILE* out) const
+{
+    fprintf(out, "%s(@%u, ", name, nodeIndex());
+    if (dataFormat() == DataFormatDouble)
+        fprintf(out, "%s", FPRInfo::debugName(fpr()));
+#if USE(JSVALUE32_64)
+    else if (dataFormat() & DataFormatJS)
+        fprintf(out, "%s:%s", GPRInfo::debugName(tagGPR()), GPRInfo::debugName(payloadGPR()));
+#endif
+    else
+        fprintf(out, "%s", GPRInfo::debugName(gpr()));
+    fprintf(out, ", %s)", dataFormatToString(dataFormat()));
+}
+
+void VariableEvent::dumpSpillInfo(const char* name, FILE* out) const
+{
+    fprintf(out, "%s(@%u, r%d, %s)", name, nodeIndex(), virtualRegister(), dataFormatToString(dataFormat()));
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+