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diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
new file mode 100644
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+++ b/Source/cmListFileCache.h
@@ -0,0 +1,166 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmListFileCache_h
+#define cmListFileCache_h
+
+#include "cmStandardIncludes.h"
+
+#include "cmState.h"
+
+/** \class cmListFileCache
+ * \brief A class to cache list file contents.
+ *
+ * cmListFileCache is a class used to cache the contents of parsed
+ * cmake list files.
+ */
+
+class cmMakefile;
+
+struct cmCommandContext
+{
+  std::string Name;
+  long Line;
+  cmCommandContext()
+    : Name()
+    , Line(0)
+  {
+  }
+};
+
+struct cmListFileArgument
+{
+  enum Delimiter
+  {
+    Unquoted,
+    Quoted,
+    Bracket
+  };
+  cmListFileArgument()
+    : Value()
+    , Delim(Unquoted)
+    , Line(0)
+  {
+  }
+  cmListFileArgument(const cmListFileArgument& r)
+    : Value(r.Value)
+    , Delim(r.Delim)
+    , Line(r.Line)
+  {
+  }
+  cmListFileArgument(const std::string& v, Delimiter d, long line)
+    : Value(v)
+    , Delim(d)
+    , Line(line)
+  {
+  }
+  bool operator==(const cmListFileArgument& r) const
+  {
+    return (this->Value == r.Value) && (this->Delim == r.Delim);
+  }
+  bool operator!=(const cmListFileArgument& r) const { return !(*this == r); }
+  std::string Value;
+  Delimiter Delim;
+  long Line;
+};
+
+class cmListFileContext
+{
+public:
+  std::string Name;
+  std::string FilePath;
+  long Line;
+  cmListFileContext()
+    : Name()
+    , FilePath()
+    , Line(0)
+  {
+  }
+
+  static cmListFileContext FromCommandContext(cmCommandContext const& lfcc,
+                                              std::string const& fileName)
+  {
+    cmListFileContext lfc;
+    lfc.FilePath = fileName;
+    lfc.Line = lfcc.Line;
+    lfc.Name = lfcc.Name;
+    return lfc;
+  }
+};
+
+std::ostream& operator<<(std::ostream&, cmListFileContext const&);
+bool operator<(const cmListFileContext& lhs, const cmListFileContext& rhs);
+bool operator==(cmListFileContext const& lhs, cmListFileContext const& rhs);
+bool operator!=(cmListFileContext const& lhs, cmListFileContext const& rhs);
+
+struct cmListFileFunction : public cmCommandContext
+{
+  std::vector<cmListFileArgument> Arguments;
+};
+
+// Represent a backtrace (call stack).  Provide value semantics
+// but use efficient reference-counting underneath to avoid copies.
+class cmListFileBacktrace
+{
+public:
+  // Default-constructed backtrace may not be used until after
+  // set via assignment from a backtrace constructed with a
+  // valid snapshot.
+  cmListFileBacktrace();
+
+  // Construct an empty backtrace whose bottom sits in the directory
+  // indicated by the given valid snapshot.
+  cmListFileBacktrace(cmState::Snapshot snapshot);
+
+  // Backtraces may be copied and assigned as values.
+  cmListFileBacktrace(cmListFileBacktrace const& r);
+  cmListFileBacktrace& operator=(cmListFileBacktrace const& r);
+  ~cmListFileBacktrace();
+
+  // Get a backtrace with the given file scope added to the top.
+  // May not be called until after construction with a valid snapshot.
+  cmListFileBacktrace Push(std::string const& file) const;
+
+  // Get a backtrace with the given call context added to the top.
+  // May not be called until after construction with a valid snapshot.
+  cmListFileBacktrace Push(cmListFileContext const& lfc) const;
+
+  // Get a backtrace with the top level removed.
+  // May not be called until after a matching Push.
+  cmListFileBacktrace Pop() const;
+
+  // Get the context at the top of the backtrace.
+  // Returns an empty context if the backtrace is empty.
+  cmListFileContext const& Top() const;
+
+  // Print the top of the backtrace.
+  void PrintTitle(std::ostream& out) const;
+
+  // Print the call stack below the top of the backtrace.
+  void PrintCallStack(std::ostream& out) const;
+
+private:
+  struct Entry;
+  cmState::Snapshot Bottom;
+  Entry* Cur;
+  cmListFileBacktrace(cmState::Snapshot bottom, Entry* up,
+                      cmListFileContext const& lfc);
+  cmListFileBacktrace(cmState::Snapshot bottom, Entry* cur);
+};
+
+struct cmListFile
+{
+  bool ParseFile(const char* path, cmMakefile* mf);
+
+  std::vector<cmListFileFunction> Functions;
+};
+
+#endif