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diff --git a/include/llvm/Debugger/RuntimeInfo.h b/include/llvm/Debugger/RuntimeInfo.h
new file mode 100644
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+++ b/include/llvm/Debugger/RuntimeInfo.h
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+//===- RuntimeInfo.h - Information about running program --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines classes that capture various pieces of information about
+// the currently executing, but stopped, program.  One instance of this object
+// is created every time a program is stopped, and destroyed every time it
+// starts running again.  This object's main goal is to make access to runtime
+// information easy and efficient, by caching information as requested.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGGER_RUNTIMEINFO_H
+#define LLVM_DEBUGGER_RUNTIMEINFO_H
+
+#include <vector>
+#include <cassert>
+
+namespace llvm {
+  class ProgramInfo;
+  class RuntimeInfo;
+  class InferiorProcess;
+  class GlobalVariable;
+  class SourceFileInfo;
+
+  /// StackFrame - One instance of this structure is created for each stack
+  /// frame that is active in the program.
+  ///
+  class StackFrame {
+    RuntimeInfo &RI;
+    void *FrameID;
+    const GlobalVariable *FunctionDesc;
+
+    /// LineNo, ColNo, FileInfo - This information indicates WHERE in the source
+    /// code for the program the stack frame is located.
+    unsigned LineNo, ColNo;
+    const SourceFileInfo *SourceInfo;
+  public:
+    StackFrame(RuntimeInfo &RI, void *ParentFrameID);
+
+    StackFrame &operator=(const StackFrame &RHS) {
+      FrameID = RHS.FrameID;
+      FunctionDesc = RHS.FunctionDesc;
+      return *this;
+    }
+
+    /// getFrameID - return the low-level opaque frame ID of this stack frame.
+    ///
+    void *getFrameID() const { return FrameID; }
+
+    /// getFunctionDesc - Return the descriptor for the function that contains
+    /// this stack frame, or null if it is unknown.
+    ///
+    const GlobalVariable *getFunctionDesc();
+
+    /// getSourceLocation - Return the source location that this stack frame is
+    /// sitting at.
+    void getSourceLocation(unsigned &LineNo, unsigned &ColNo,
+                           const SourceFileInfo *&SourceInfo);
+  };
+
+
+  /// RuntimeInfo - This class collects information about the currently running
+  /// process.  It is created whenever the program stops execution for the
+  /// debugger, and destroyed whenver execution continues.
+  class RuntimeInfo {
+    /// ProgInfo - This object contains static information about the program.
+    ///
+    ProgramInfo *ProgInfo;
+
+    /// IP - This object contains information about the actual inferior process
+    /// that we are communicating with and aggregating information from.
+    const InferiorProcess &IP;
+
+    /// CallStack - This caches information about the current stack trace of the
+    /// program.  This is lazily computed as needed.
+    std::vector<StackFrame> CallStack;
+
+    /// CurrentFrame - The user can traverse the stack frame with the
+    /// up/down/frame family of commands.  This index indicates the current
+    /// stack frame.
+    unsigned CurrentFrame;
+
+  public:
+    RuntimeInfo(ProgramInfo *PI, const InferiorProcess &ip)
+      : ProgInfo(PI), IP(ip), CurrentFrame(0) {
+      // Make sure that the top of stack has been materialized.  If this throws
+      // an exception, something is seriously wrong and the RuntimeInfo object
+      // would be unusable anyway.
+      getStackFrame(0);
+    }
+
+    ProgramInfo &getProgramInfo() { return *ProgInfo; }
+    const InferiorProcess &getInferiorProcess() const { return IP; }
+
+    //===------------------------------------------------------------------===//
+    // Methods for inspecting the call stack of the program.
+    //
+
+    /// getStackFrame - Materialize the specified stack frame and return it.  If
+    /// the specified ID is off of the bottom of the stack, throw an exception
+    /// indicating the problem.
+    StackFrame &getStackFrame(unsigned ID) {
+      if (ID >= CallStack.size())
+        materializeFrame(ID);
+      return CallStack[ID];
+    }
+
+    /// getCurrentFrame - Return the current stack frame object that the user is
+    /// inspecting.
+    StackFrame &getCurrentFrame() {
+      assert(CallStack.size() > CurrentFrame &&
+             "Must have materialized frame before making it current!");
+      return CallStack[CurrentFrame];
+    }
+
+    /// getCurrentFrameIdx - Return the current frame the user is inspecting.
+    ///
+    unsigned getCurrentFrameIdx() const { return CurrentFrame; }
+
+    /// setCurrentFrameIdx - Set the current frame index to the specified value.
+    /// Note that the specified frame must have been materialized with
+    /// getStackFrame before it can be made current.
+    void setCurrentFrameIdx(unsigned Idx) {
+      assert(Idx < CallStack.size() &&
+             "Must materialize frame before making it current!");
+      CurrentFrame = Idx;
+    }
+  private:
+    /// materializeFrame - Create and process all frames up to and including the
+    /// specified frame number.  This throws an exception if the specified frame
+    /// ID is nonexistant.
+    void materializeFrame(unsigned ID);
+  };
+}
+
+#endif