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# SPDX-License-Identifier: Apache-2.0
# Copyright 2020 The Meson development team
# Copyright © 2023 Intel Corporation
from __future__ import annotations
import collections
import os
import pathlib
import pickle
import re
import typing as T
from ..backend.ninjabackend import ninja_quote
if T.TYPE_CHECKING:
from typing_extensions import Literal
from ..backend.ninjabackend import TargetDependencyScannerInfo
CPP_IMPORT_RE = re.compile(r'\w*import ([a-zA-Z0-9]+);')
CPP_EXPORT_RE = re.compile(r'\w*export module ([a-zA-Z0-9]+);')
FORTRAN_INCLUDE_PAT = r"^\s*include\s*['\"](\w+\.\w+)['\"]"
FORTRAN_MODULE_PAT = r"^\s*\bmodule\b\s+(\w+)\s*(?:!+.*)*$"
FORTRAN_SUBMOD_PAT = r"^\s*\bsubmodule\b\s*\((\w+:?\w+)\)\s*(\w+)"
FORTRAN_USE_PAT = r"^\s*use,?\s*(?:non_intrinsic)?\s*(?:::)?\s*(\w+)"
FORTRAN_MODULE_RE = re.compile(FORTRAN_MODULE_PAT, re.IGNORECASE)
FORTRAN_SUBMOD_RE = re.compile(FORTRAN_SUBMOD_PAT, re.IGNORECASE)
FORTRAN_USE_RE = re.compile(FORTRAN_USE_PAT, re.IGNORECASE)
class DependencyScanner:
def __init__(self, pickle_file: str, outfile: str):
with open(pickle_file, 'rb') as pf:
self.target_data: TargetDependencyScannerInfo = pickle.load(pf)
self.outfile = outfile
self.sources = self.target_data.sources
self.provided_by: T.Dict[str, str] = {}
self.exports: T.Dict[str, str] = {}
self.needs: collections.defaultdict[str, T.List[str]] = collections.defaultdict(list)
self.sources_with_exports: T.List[str] = []
def scan_file(self, fname: str, lang: Literal['cpp', 'fortran']) -> None:
if lang == 'fortran':
self.scan_fortran_file(fname)
else:
self.scan_cpp_file(fname)
def scan_fortran_file(self, fname: str) -> None:
fpath = pathlib.Path(fname)
modules_in_this_file = set()
for line in fpath.read_text(encoding='utf-8', errors='ignore').split('\n'):
import_match = FORTRAN_USE_RE.match(line)
export_match = FORTRAN_MODULE_RE.match(line)
submodule_export_match = FORTRAN_SUBMOD_RE.match(line)
if import_match:
needed = import_match.group(1).lower()
# In Fortran you have an using declaration also for the module
# you define in the same file. Prevent circular dependencies.
if needed not in modules_in_this_file:
self.needs[fname].append(needed)
if export_match:
exported_module = export_match.group(1).lower()
assert exported_module not in modules_in_this_file
modules_in_this_file.add(exported_module)
if exported_module in self.provided_by:
raise RuntimeError(f'Multiple files provide module {exported_module}.')
self.sources_with_exports.append(fname)
self.provided_by[exported_module] = fname
self.exports[fname] = exported_module
if submodule_export_match:
# Store submodule "Foo" "Bar" as "foo:bar".
# A submodule declaration can be both an import and an export declaration:
#
# submodule (a1:a2) a3
# - requires a1@a2.smod
# - produces a1@a3.smod
parent_module_name_full = submodule_export_match.group(1).lower()
parent_module_name = parent_module_name_full.split(':')[0]
submodule_name = submodule_export_match.group(2).lower()
concat_name = f'{parent_module_name}:{submodule_name}'
self.sources_with_exports.append(fname)
self.provided_by[concat_name] = fname
self.exports[fname] = concat_name
# Fortran requires that the immediate parent module must be built
# before the current one. Thus:
#
# submodule (parent) parent <- requires parent.mod (really parent.smod, but they are created at the same time)
# submodule (a1:a2) a3 <- requires a1@a2.smod
#
# a3 does not depend on the a1 parent module directly, only transitively.
self.needs[fname].append(parent_module_name_full)
def scan_cpp_file(self, fname: str) -> None:
fpath = pathlib.Path(fname)
for line in fpath.read_text(encoding='utf-8', errors='ignore').split('\n'):
import_match = CPP_IMPORT_RE.match(line)
export_match = CPP_EXPORT_RE.match(line)
if import_match:
needed = import_match.group(1)
self.needs[fname].append(needed)
if export_match:
exported_module = export_match.group(1)
if exported_module in self.provided_by:
raise RuntimeError(f'Multiple files provide module {exported_module}.')
self.sources_with_exports.append(fname)
self.provided_by[exported_module] = fname
self.exports[fname] = exported_module
def module_name_for(self, src: str, lang: Literal['cpp', 'fortran']) -> str:
if lang == 'fortran':
exported = self.exports[src]
# Module foo:bar goes to a file name foo@bar.smod
# Module Foo goes to a file name foo.mod
namebase = exported.replace(':', '@')
if ':' in exported:
extension = 'smod'
else:
extension = 'mod'
return os.path.join(self.target_data.private_dir, f'{namebase}.{extension}')
return '{}.ifc'.format(self.exports[src])
def scan(self) -> int:
for s, lang in self.sources:
self.scan_file(s, lang)
with open(self.outfile, 'w', encoding='utf-8') as ofile:
ofile.write('ninja_dyndep_version = 1\n')
for src, lang in self.sources:
objfilename = self.target_data.source2object[src]
mods_and_submods_needed = []
module_files_generated = []
module_files_needed = []
if src in self.sources_with_exports:
module_files_generated.append(self.module_name_for(src, lang))
if src in self.needs:
for modname in self.needs[src]:
if modname not in self.provided_by:
# Nothing provides this module, we assume that it
# comes from a dependency library somewhere and is
# already built by the time this compilation starts.
pass
else:
mods_and_submods_needed.append(modname)
for modname in mods_and_submods_needed:
provider_src = self.provided_by[modname]
provider_modfile = self.module_name_for(provider_src, lang)
# Prune self-dependencies
if provider_src != src:
module_files_needed.append(provider_modfile)
quoted_objfilename = ninja_quote(objfilename, True)
quoted_module_files_generated = [ninja_quote(x, True) for x in module_files_generated]
quoted_module_files_needed = [ninja_quote(x, True) for x in module_files_needed]
if quoted_module_files_generated:
mod_gen = '| ' + ' '.join(quoted_module_files_generated)
else:
mod_gen = ''
if quoted_module_files_needed:
mod_dep = '| ' + ' '.join(quoted_module_files_needed)
else:
mod_dep = ''
build_line = 'build {} {}: dyndep {}'.format(quoted_objfilename,
mod_gen,
mod_dep)
ofile.write(build_line + '\n')
return 0
def run(args: T.List[str]) -> int:
assert len(args) == 2, 'got wrong number of arguments!'
outfile, pickle_file = args
scanner = DependencyScanner(pickle_file, outfile)
return scanner.scan()
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