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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, abspath, modpath, code):
if modpath in self.modules:
raise AttributeError, "%s already found in importer" % modpath
self.modules[modpath] = (filename, abspath, 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
try:
mod = sys.modules[fullname]
except KeyError:
mod = imp.new_module(fullname)
sys.modules[fullname] = mod
try:
mod.__loader__ = self
srcfile,abspath,code = self.modules[fullname]
override = os.environ.get('M5_OVERRIDE_PY_SOURCE', 'false').lower()
if override in ('true', 'yes') and os.path.exists(abspath):
src = file(abspath, 'r').read()
code = compile(src, abspath, 'exec')
if os.path.basename(srcfile) == '__init__.py':
mod.__path__ = fullname.split('.')
mod.__package__ = fullname
else:
mod.__package__ = fullname.rpartition('.')[0]
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)
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