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diff --git a/src/python/importer.py b/src/python/importer.py
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+++ b/src/python/importer.py
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+# Copyright (c) 2008 The Hewlett-Packard Development Company
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# 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;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "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 THE COPYRIGHT
+# OWNER 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.
+#
+# Authors: Nathan Binkert
+
+# Simple importer that allows python to import data from a dict of
+# code objects.  The keys are the module path, and the items are the
+# filename and bytecode of the file.
+class CodeImporter(object):
+    def __init__(self):
+        self.modules = {}
+
+    def add_module(self, filename, modpath, code):
+        if modpath in self.modules:
+            raise AttributeError, "%s already found in importer"
+
+        self.modules[modpath] = (filename, code)
+
+    def find_module(self, fullname, path):
+        if fullname in self.modules:
+            return self
+
+        return None
+
+    def load_module(self, fullname):
+        # Because the importer is created and initialized in its own
+        # little sandbox (in init.cc), the globals that were available
+        # when the importer module was loaded and CodeImporter was
+        # defined are not available when load_module is actually
+        # called. Soooo, the imports must live here.
+        import imp
+        import os
+        import sys
+        mod = imp.new_module(fullname)
+        sys.modules[fullname] = mod
+
+        try:
+            mod.__loader__ = self
+            srcfile,code = self.modules[fullname]
+            if os.path.basename(srcfile) == '__init__.py':
+                mod.__path__ = fullname.split('.')
+            mod.__file__ = srcfile
+
+            exec code in mod.__dict__
+        except Exception:
+            del sys.modules[fullname]
+            raise
+
+        return mod
+
+# Create an importer and add it to the meta_path so future imports can
+# use it.  There's currently nothing in the importer, but calls to
+# add_module can be used to add code.
+import sys
+importer = CodeImporter()
+add_module = importer.add_module
+sys.meta_path.append(importer)