63dae28703
The custom Python loader didn't comply with PEP302 for two reasons: * Previously, we would overwrite old modules on name conflicts. PEP302 explicitly states that: "If there is an existing module object named 'fullname' in sys.modules, the loader must use that existing module". * The "__package__" attribute wasn't set. PEP302: "The __package__ attribute must be set." This changeset addresses both of these issues.
94 lines
3.7 KiB
Python
94 lines
3.7 KiB
Python
# Copyright (c) 2008 The Hewlett-Packard Development Company
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Nathan Binkert
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# Simple importer that allows python to import data from a dict of
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# code objects. The keys are the module path, and the items are the
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# filename and bytecode of the file.
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class CodeImporter(object):
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def __init__(self):
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self.modules = {}
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def add_module(self, filename, abspath, modpath, code):
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if modpath in self.modules:
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raise AttributeError, "%s already found in importer" % modpath
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self.modules[modpath] = (filename, abspath, code)
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def find_module(self, fullname, path):
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if fullname in self.modules:
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return self
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return None
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def load_module(self, fullname):
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# Because the importer is created and initialized in its own
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# little sandbox (in init.cc), the globals that were available
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# when the importer module was loaded and CodeImporter was
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# defined are not available when load_module is actually
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# called. Soooo, the imports must live here.
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import imp
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import os
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import sys
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try:
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mod = sys.modules[fullname]
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except KeyError:
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mod = imp.new_module(fullname)
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sys.modules[fullname] = mod
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try:
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mod.__loader__ = self
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srcfile,abspath,code = self.modules[fullname]
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override = os.environ.get('M5_OVERRIDE_PY_SOURCE', 'false').lower()
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if override in ('true', 'yes') and os.path.exists(abspath):
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src = file(abspath, 'r').read()
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code = compile(src, abspath, 'exec')
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if os.path.basename(srcfile) == '__init__.py':
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mod.__path__ = fullname.split('.')
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mod.__package__ = fullname
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else:
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mod.__package__ = fullname.rpartition('.')[0]
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mod.__file__ = srcfile
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exec code in mod.__dict__
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except Exception:
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del sys.modules[fullname]
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raise
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return mod
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# Create an importer and add it to the meta_path so future imports can
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# use it. There's currently nothing in the importer, but calls to
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# add_module can be used to add code.
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import sys
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importer = CodeImporter()
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add_module = importer.add_module
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sys.meta_path.append(importer)
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