59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
import collections
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Entry = collections.namedtuple('Entry', 'version, hash')
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def update_hash(seed, value):
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# Good old boost::hash_combine
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# https://www.boost.org/doc/libs/1_35_0/doc/html/boost/hash_combine_id241013.html
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return seed ^ (hash(value) + 0x9e3779b9 + (seed << 6) + (seed >> 2))
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def hash_source_files(hash_value, source_files):
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for filename in source_files:
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with open(filename) as file:
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hash_value = update_hash(hash_value, file.read())
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return hash_value
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def hash_build_arguments(hash_value, build_arguments):
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for group in build_arguments:
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if group:
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for argument in group:
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hash_value = update_hash(hash_value, argument)
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return hash_value
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class ExtensionVersioner(object):
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def __init__(self):
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self.entries = {}
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def get_version(self, name):
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entry = self.entries.get(name)
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return None if entry is None else entry.version
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def bump_version_if_changed(self,
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name,
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source_files,
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build_arguments,
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build_directory,
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with_cuda,
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is_python_module,
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is_standalone):
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hash_value = 0
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hash_value = hash_source_files(hash_value, source_files)
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hash_value = hash_build_arguments(hash_value, build_arguments)
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hash_value = update_hash(hash_value, build_directory)
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hash_value = update_hash(hash_value, with_cuda)
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hash_value = update_hash(hash_value, is_python_module)
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hash_value = update_hash(hash_value, is_standalone)
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entry = self.entries.get(name)
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if entry is None:
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self.entries[name] = entry = Entry(0, hash_value)
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elif hash_value != entry.hash:
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self.entries[name] = entry = Entry(entry.version + 1, hash_value)
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return entry.version
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