diff --git a/include/utils/CallStack.h b/include/utils/CallStack.h
new file mode 100644
index 0000000..c2c8ce5
--- /dev/null
+++ b/include/utils/CallStack.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_CALLSTACK_H
+#define ANDROID_CALLSTACK_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/String8.h>
+
+// ---------------------------------------------------------------------------
+
+namespace android {
+
+class CallStack
+{
+public:
+    enum {
+        MAX_DEPTH = 31
+    };
+
+    CallStack();
+    CallStack(const CallStack& rhs);
+    ~CallStack();
+
+    CallStack& operator = (const CallStack& rhs);
+    
+    bool operator == (const CallStack& rhs) const;
+    bool operator != (const CallStack& rhs) const;
+    bool operator < (const CallStack& rhs) const;
+    bool operator >= (const CallStack& rhs) const;
+    bool operator > (const CallStack& rhs) const;
+    bool operator <= (const CallStack& rhs) const;
+    
+    const void* operator [] (int index) const;
+    
+    void clear();
+
+    void update(int32_t ignoreDepth=0, int32_t maxDepth=MAX_DEPTH);
+
+    // Dump a stack trace to the log
+    void dump(const char* prefix = 0) const;
+
+    // Return a string (possibly very long) containing the complete stack trace
+    String8 toString(const char* prefix = 0) const;
+    
+    size_t size() const { return mCount; }
+
+private:
+    // Internal helper function
+    String8 toStringSingleLevel(const char* prefix, int32_t level) const;
+
+    size_t      mCount;
+    const void* mStack[MAX_DEPTH];
+};
+
+}; // namespace android
+
+
+// ---------------------------------------------------------------------------
+
+#endif // ANDROID_CALLSTACK_H