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92 lines
3.1 KiB
92 lines
3.1 KiB
#!/usr/bin/env python3
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# Copyright (c) 2018 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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import sys
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import re
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MAPPING = {
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'core_read.cpp': 'core_io.cpp',
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'core_write.cpp': 'core_io.cpp',
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}
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# Directories with header-based modules, where the assumption that .cpp files
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# define functions and variables declared in corresponding .h files is
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# incorrect.
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HEADER_MODULE_PATHS = [
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'interfaces/'
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]
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def module_name(path):
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if path in MAPPING:
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path = MAPPING[path]
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if any(path.startswith(dirpath) for dirpath in HEADER_MODULE_PATHS):
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return path
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if path.endswith(".h"):
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return path[:-2]
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if path.endswith(".c"):
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return path[:-2]
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if path.endswith(".cpp"):
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return path[:-4]
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return None
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files = dict()
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deps = dict()
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RE = re.compile("^#include <(.*)>")
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# Iterate over files, and create list of modules
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for arg in sys.argv[1:]:
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module = module_name(arg)
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if module is None:
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print("Ignoring file %s (does not constitute module)\n" % arg)
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else:
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files[arg] = module
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deps[module] = set()
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# Iterate again, and build list of direct dependencies for each module
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# TODO: implement support for multiple include directories
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for arg in sorted(files.keys()):
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module = files[arg]
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with open(arg, 'r', encoding="utf8") as f:
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for line in f:
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match = RE.match(line)
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if match:
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include = match.group(1)
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included_module = module_name(include)
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if included_module is not None and included_module in deps and included_module != module:
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deps[module].add(included_module)
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# Loop to find the shortest (remaining) circular dependency
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have_cycle = False
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while True:
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shortest_cycle = None
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for module in sorted(deps.keys()):
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# Build the transitive closure of dependencies of module
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closure = dict()
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for dep in deps[module]:
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closure[dep] = []
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while True:
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old_size = len(closure)
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old_closure_keys = sorted(closure.keys())
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for src in old_closure_keys:
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for dep in deps[src]:
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if dep not in closure:
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closure[dep] = closure[src] + [src]
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if len(closure) == old_size:
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break
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# If module is in its own transitive closure, it's a circular dependency; check if it is the shortest
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if module in closure and (shortest_cycle is None or len(closure[module]) + 1 < len(shortest_cycle)):
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shortest_cycle = [module] + closure[module]
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if shortest_cycle is None:
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break
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# We have the shortest circular dependency; report it
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module = shortest_cycle[0]
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print("Circular dependency: %s" % (" -> ".join(shortest_cycle + [module])))
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# And then break the dependency to avoid repeating in other cycles
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deps[shortest_cycle[-1]] = deps[shortest_cycle[-1]] - set([module])
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have_cycle = True
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sys.exit(1 if have_cycle else 0)
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