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#!/usr/bin/env python3
# Copyright 2022 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import argparse
import contextlib
import os
import subprocess
import sys
# Set up path to be able to import action_helpers.
sys.path.append(
os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir,
os.pardir, 'build'))
import action_helpers
from filter_clang_args import filter_clang_args
def main():
parser = argparse.ArgumentParser("run_bindgen.py")
parser.add_argument("--exe", help="Path to bindgen", required=True),
parser.add_argument("--header",
help="C header file to generate bindings for",
required=True)
parser.add_argument("--depfile",
help="depfile to output with header dependencies")
parser.add_argument("--output", help="output .rs bindings", required=True)
parser.add_argument(
"--wrap-static-fns",
help="output source file for `static` and `static inline` functions")
parser.add_argument("--ld-library-path",
help="LD_LIBRARY_PATH (or DYLD_LIBRARY_PATH on Mac) to "
"set")
parser.add_argument("--libclang-path",
help="Path to the libclang shared libray.")
parser.add_argument("-I", "--include", help="include path", action="append")
parser.add_argument("--bindgen-flags",
help="flags to pass to bindgen",
nargs="*")
parser.add_argument(
"clangargs",
metavar="CLANGARGS",
help="arguments to pass to libclang (see "
"https://docs.rs/bindgen/latest/bindgen/struct.Builder.html#method.clang_args)",
nargs="*")
args = parser.parse_args()
# Abort if `TARGET` exists in the environment. Cargo sets `TARGET` when
# running build scripts and bindgen will try to be helpful by using that value
# if it's set. In practice we've seen a case where someone had the value set
# in their build environment with no intention of it reaching bindgen, leading
# to a hard-to-debug build error.
if 'TARGET' in os.environ:
sys.exit('ERROR: saw TARGET in environment, remove to avoid bindgen'
' failures')
with contextlib.ExitStack() as stack:
# Args passed to the actual bindgen cli
genargs = []
genargs.append('--no-layout-tests')
if args.bindgen_flags is not None:
for flag in args.bindgen_flags:
genargs.append("--" + flag)
# TODO(danakj): We need to point bindgen to
# //third_party/rust-toolchain/bin/rustfmt.
genargs.append('--no-rustfmt-bindings')
genargs += ['--rust-target', 'nightly']
if args.depfile:
depfile = stack.enter_context(action_helpers.atomic_output(args.depfile))
genargs.append('--depfile')
genargs.append(depfile.name)
# Ideally we would use action_helpers.atomic_output for the output file, but
# this would put the wrong name in the depfile.
genargs.append('--output')
genargs.append(args.output)
# The GN rules know what path to find the system headers in, and we want to
# use the headers we specify, instead of non-hermetic headers from elsewhere
# in the system.
genargs.append('--no-include-path-detection')
if args.wrap_static_fns:
wrap_static_fns = stack.enter_context(
action_helpers.atomic_output(args.wrap_static_fns))
genargs.append('--experimental')
genargs.append('--wrap-static-fns')
genargs.append('--wrap-static-fns-path')
genargs.append(wrap_static_fns.name)
genargs.append(args.header)
genargs.append('--')
genargs.extend(filter_clang_args(args.clangargs))
env = os.environ
if args.ld_library_path:
if sys.platform == 'darwin':
env["DYLD_LIBRARY_PATH"] = args.ld_library_path
else:
env["LD_LIBRARY_PATH"] = args.ld_library_path
if args.libclang_path:
env["LIBCLANG_PATH"] = args.libclang_path
try:
subprocess.check_call([args.exe, *genargs], env=env)
except:
# Make sure we don't emit anything if bindgen failed. The other files use
# action_helpers for this.
try:
os.remove(args.output)
except FileNotFoundError:
pass
raise
if __name__ == '__main__':
main()
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