117 lines
3.6 KiB
Python
117 lines
3.6 KiB
Python
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#===- gen-msvc-exports.py - Generate C API export file -------*- python -*--===#
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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#===------------------------------------------------------------------------===#
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#
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# Generate an export file from a list of given LIB files. This only exports symbols
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# that start with LLVM, so it only exports the LLVM C API.
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#
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# To have CMake run this, set LLVM_BUILD_LLVM_C_DYLIB to on while
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# building on Windows.
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#
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# To run manually, build LLVM with Visual Studio, use a Command prompt
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# to navigate to the directory with the .lib files (Debug\lib etc). Then run
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# python C:\Path\To\gen-msvc-exports.py --nm ..\bin\llvm-nm.exe LLVM*.lib
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#
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# If you're generating a 32 bit DLL, use the `--underscore` flag.
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# If you want to use a different `llvm-nm` executable, pass the path
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# with the `--nm` flag.
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#
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# You can use the --output flag to set the name of the export file.
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#
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#===------------------------------------------------------------------------===#
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from tempfile import mkstemp
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from contextlib import contextmanager
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from subprocess import check_call
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import argparse
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import os
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import re
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_UNDERSCORE_REGEX = {
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False: re.compile(r"^\w+\s+T\s+(LLVM.*)$"),
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True: re.compile(r"^\w+\s+T\s+_(LLVM.*)$")
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}
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@contextmanager
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def removing(path):
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try:
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yield path
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finally:
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os.unlink(path)
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def touch_tempfile(*args, **kwargs):
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fd, name = mkstemp(*args, **kwargs)
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os.close(fd)
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return name
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def gen_llvm_c_export(output, underscore, libs, nm):
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"""Generate the export file for the LLVM-C DLL.
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Run `nm` for each lib in `libs`, and output an export file
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to `output`. If `underscore` is true, symbols will
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be assumed to be prefixed with an underscore.
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"""
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with removing(touch_tempfile(prefix='dumpout', suffix='.txt')) as dumpout:
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# Get the right regex.
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p = _UNDERSCORE_REGEX[underscore]
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with open(output, 'w+t') as output_f:
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# For each lib get the LLVM* functions it exports.
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for lib in libs:
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# Call dumpbin.
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with open(dumpout, 'w+t') as dumpout_f:
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check_call([nm, '-g', lib], stdout=dumpout_f)
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# Get the matching lines.
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with open(dumpout) as dumpbin:
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for line in dumpbin:
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m = p.match(line)
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if m is not None:
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output_f.write(m.group(1) + '\n')
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def main():
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parser = argparse.ArgumentParser('gen-msvc-exports')
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parser.add_argument(
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'-i', '--libsfile', help='file with list of libs, new line separated',
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action='store', default=None
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)
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parser.add_argument(
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'-o', '--output', help='output filename', default='LLVM-C.exports'
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)
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parser.add_argument('-u', '--underscore',
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help='labels are prefixed with an underscore (use for 32 bit DLLs)',
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action='store_true'
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)
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parser.add_argument(
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'--nm', help='path to the llvm-nm executable', default='llvm-nm'
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)
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parser.add_argument(
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'libs', metavar='LIBS', nargs='*', help='list of libraries to generate export from'
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)
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ns = parser.parse_args()
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libs = ns.libs
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# Add if we where given a libsfile add it to the libs.
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if ns.libsfile:
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with open(ns.libsfile) as f:
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libs.extend(f.read().splitlines())
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gen_llvm_c_export(ns.output, ns.underscore, libs, ns.nm)
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if __name__ == '__main__':
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main()
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