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# Copyright 2020 The Meson development team
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import pathlib
import pickle
import re
import typing as T
from ..backend.ninjabackend import TargetDependencyScannerInfo
import_re = re.compile('\w*import ([a-zA-Z0-9]+);')
export_re = re.compile('\w*export module ([a-zA-Z0-9]+);')
class DependencyScanner:
def __init__(self, pickle_file: str, outfile: str, sources: T.List[str]):
with open(pickle_file, 'rb') as pf:
self.target_data = pickle.load(pf) # type: TargetDependencyScannerInfo
self.outfile = outfile
self.sources = sources
self.provided_by = {} # type: T.Dict[str, str]
self.exports = {} # type: T.Dict[str, str]
self.needs = {} # type: T.Dict[str, T.List[str]]
self.sources_with_exports = [] # type: T.List[str]
def scan_file(self, fname: str) -> None:
for line in pathlib.Path(fname).read_text().split('\n'):
import_match = import_re.match(line)
export_match = export_re.match(line)
if import_match:
needed = import_match.group(1)
if fname in self.needs:
self.needs[fname].append(needed)
else:
self.needs[fname] = [needed]
if export_match:
exported_module = export_match.group(1)
if exported_module in self.provided_by:
raise RuntimeError('Multiple files provide module {}.'.format(exported_module))
self.sources_with_exports.append(fname)
self.provided_by[exported_module] = fname
self.exports[fname] = exported_module
def objname_for(self, src: str) -> str:
objname = self.target_data.source2object[src]
assert(isinstance(objname, str))
return objname
def ifcname_for(self, src: str) -> str:
return '{}.ifc'.format(self.exports[src])
def scan(self) -> int:
for s in self.sources:
self.scan_file(s)
with open(self.outfile, 'w') as ofile:
ofile.write('ninja_dyndep_version = 1\n')
for src in self.sources:
objfilename = self.objname_for(src)
if src in self.sources_with_exports:
ifc_entry = '| ' + self.ifcname_for(src)
else:
ifc_entry = ''
if src in self.needs:
# FIXME, handle all sources, not just the first one
modname = self.needs[src][0]
provider_src = self.provided_by[modname]
provider_ifc = self.ifcname_for(provider_src)
mod_dep = '| ' + provider_ifc
else:
mod_dep = ''
ofile.write('build {} {}: dyndep {}\n'.format(objfilename,
ifc_entry,
mod_dep))
return 0
def run(args: T.List[str]) -> int:
pickle_file = args[0]
outfile = args[1]
sources = args[2:]
scanner = DependencyScanner(pickle_file, outfile, sources)
return scanner.scan()
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