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#!/usr/bin/env python3
# Copyright (c) 2018-2020 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
import sys
import re
MAPPING = {
'core_read.cpp': 'core_io.cpp',
'core_write.cpp': 'core_io.cpp',
}
# Directories with header-based modules, where the assumption that .cpp files
# define functions and variables declared in corresponding .h files is
# incorrect.
HEADER_MODULE_PATHS = [
'interfaces/'
]
def module_name(path):
if path in MAPPING:
path = MAPPING[path]
if any(path.startswith(dirpath) for dirpath in HEADER_MODULE_PATHS):
return path
if path.endswith(".h"):
return path[:-2]
if path.endswith(".c"):
return path[:-2]
if path.endswith(".cpp"):
return path[:-4]
return None
files = dict()
deps: dict[str, set[str]] = dict()
RE = re.compile("^#include <(.*)>")
# Iterate over files, and create list of modules
for arg in sys.argv[1:]:
module = module_name(arg)
if module is None:
print("Ignoring file %s (does not constitute module)\n" % arg)
else:
files[arg] = module
deps[module] = set()
# Iterate again, and build list of direct dependencies for each module
# TODO: implement support for multiple include directories
for arg in sorted(files.keys()):
module = files[arg]
with open(arg, 'r', encoding="utf8") as f:
for line in f:
match = RE.match(line)
if match:
include = match.group(1)
included_module = module_name(include)
if included_module is not None and included_module in deps and included_module != module:
deps[module].add(included_module)
# Loop to find the shortest (remaining) circular dependency
have_cycle: bool = False
while True:
shortest_cycle = None
for module in sorted(deps.keys()):
# Build the transitive closure of dependencies of module
closure: dict[str, list[str]] = dict()
for dep in deps[module]:
closure[dep] = []
while True:
old_size = len(closure)
old_closure_keys = sorted(closure.keys())
for src in old_closure_keys:
for dep in deps[src]:
if dep not in closure:
closure[dep] = closure[src] + [src]
if len(closure) == old_size:
break
# If module is in its own transitive closure, it's a circular dependency; check if it is the shortest
if module in closure and (shortest_cycle is None or len(closure[module]) + 1 < len(shortest_cycle)):
shortest_cycle = [module] + closure[module]
if shortest_cycle is None:
break
# We have the shortest circular dependency; report it
module = shortest_cycle[0]
print("Circular dependency: %s" % (" -> ".join(shortest_cycle + [module])))
# And then break the dependency to avoid repeating in other cycles
deps[shortest_cycle[-1]] = deps[shortest_cycle[-1]] - set([module])
have_cycle = True
sys.exit(1 if have_cycle else 0)
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