mirror of
https://github.com/yugr/Implib.so
synced 2026-06-08 18:33:41 +00:00
Yury Gribov
259 lines
6.7 KiB
Python
Executable File
259 lines
6.7 KiB
Python
Executable File
#!/usr/bin/python3
|
|
|
|
# Copyright 2020 Yury Gribov
|
|
#
|
|
# Use of this source code is governed by MIT license that can be
|
|
# found in the LICENSE.txt file.
|
|
#
|
|
# Wrapper for ld which automatically calls implib-gen.
|
|
# To enable, add it to PATH.
|
|
# Flags are passed via env variable IMPLIBSO_LD_OPTIONS.
|
|
|
|
import sys
|
|
import os
|
|
import os.path
|
|
import re
|
|
import subprocess
|
|
import argparse
|
|
import tempfile
|
|
import atexit
|
|
import shutil
|
|
|
|
me = os.path.basename(__file__)
|
|
v = 0
|
|
|
|
def warn(msg):
|
|
"""
|
|
Print nicely formatted warning message.
|
|
"""
|
|
sys.stderr.write('%s: warning: %s\n' % (me, msg))
|
|
|
|
def error(msg):
|
|
"""
|
|
Print nicely formatted error message and exit.
|
|
"""
|
|
sys.stderr.write('%s: error: %s\n' % (me, msg))
|
|
sys.exit(1)
|
|
|
|
def note(msg):
|
|
"""
|
|
Print nicely formatted message.
|
|
"""
|
|
sys.stderr.write('%s: %s\n' % (me, msg))
|
|
|
|
def run(cmd):
|
|
"""
|
|
Simple wrapper for subprocess.Popen,
|
|
"""
|
|
if isinstance(cmd, str):
|
|
cmd = cmd.split(' ')
|
|
if v > 0:
|
|
note("running %s..." % cmd)
|
|
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
out, err = p.communicate()
|
|
out = out.decode('utf-8')
|
|
err = err.decode('utf-8')
|
|
if p.returncode != 0:
|
|
sys.stdout.write(out)
|
|
sys.stderr.write(err)
|
|
sys.exit(p.returncode)
|
|
return p.returncode, out, err
|
|
|
|
def which(exe, all=False):
|
|
"""
|
|
Analog if which(1).
|
|
"""
|
|
paths = os.environ['PATH'].split(os.pathsep)
|
|
# TODO: append .exe on Windows
|
|
exes = []
|
|
for p in paths:
|
|
f = os.path.join(p, exe)
|
|
if os.path.isfile(f):
|
|
exes.append(f)
|
|
first = exes[0] if exes else None
|
|
return exes if all else first
|
|
|
|
def is_system_library(name):
|
|
"""
|
|
Is library a basic one (and thus should not be wrapped)?
|
|
"""
|
|
return name in ['c', 'm', 'dl', 'rt', 'pthread', 'gcc', 'gcc_s']
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(description="""\
|
|
Ld wrapper to simplify application of implib-gen.
|
|
|
|
Flags can be specified directly or via IMPLIBSO_LD_OPTIONS environment variable.
|
|
""")
|
|
parser.add_argument('--verbose', '-v',
|
|
help="Print diagnostic info.",
|
|
action='count',
|
|
default=0)
|
|
parser.add_argument('--outdir', '-o',
|
|
help="Directory for temp files.",
|
|
default='')
|
|
parser.add_argument('--wrap-libs',
|
|
help="Wrap only libraries in comma-separated list.",
|
|
default='')
|
|
parser.add_argument('--no-wrap-libs',
|
|
help="Do not wrap only libraries in comma-separated list.",
|
|
default='')
|
|
|
|
env_default = '--help' if len(sys.argv) <= 1 else ''
|
|
env_opts = os.environ.get('IMPLIBSO_LD_OPTIONS', env_default)
|
|
env_argv = env_opts.split(' ') if env_opts else []
|
|
env_args = parser.parse_args(env_argv)
|
|
|
|
global v
|
|
v = env_args.verbose
|
|
|
|
if env_args.outdir:
|
|
tmpd = env_args.outdir
|
|
else:
|
|
tmpd = tempfile.mkdtemp('implib-gen-ld')
|
|
atexit.register(lambda: shutil.rmtree(tmpd))
|
|
|
|
wrap_libs = set()
|
|
no_wrap_libs = set()
|
|
for obj, param in [(wrap_libs, env_args.wrap_libs),
|
|
(no_wrap_libs, env_args.no_wrap_libs)]:
|
|
for lib in param.split(','):
|
|
if lib:
|
|
lib = re.sub(r'^(lib)?(.*)(\.so).*', r'\1', lib)
|
|
obj.add(lib)
|
|
|
|
args = []
|
|
out_filename = 'a.out'
|
|
for i in range(len(sys.argv)):
|
|
arg = sys.argv[i]
|
|
if arg == '-o':
|
|
i += 1
|
|
out_filename = sys.argv[i]
|
|
elif arg.startswith('-o'):
|
|
out_filename = arg[2:]
|
|
|
|
all_lds = which(sys.argv[0], all=True)
|
|
if not all_lds:
|
|
error("no ld executables in PATH")
|
|
elif len(all_lds) == 1:
|
|
error("real ld executable not found in PATH")
|
|
real_ld = all_lds[1]
|
|
this_ld = os.path.realpath(__file__)
|
|
if os.path.realpath(real_ld) == os.path.realpath(this_ld):
|
|
error("ld wrapper is not the first executable in PATH")
|
|
sys.argv[0] = real_ld
|
|
|
|
# Generate normal output first
|
|
rc, out, err = run(sys.argv)
|
|
if rc != 0:
|
|
sys.stdout.write(out)
|
|
sys.stderr.write(err)
|
|
sys.exit(rc)
|
|
|
|
# Analyze ldd output to see which runtime libs were linked
|
|
rc, out, err = run('ldd %s' % out_filename)
|
|
os.unlink(out_filename) # Remove output in case we fail later
|
|
if rc != 0:
|
|
error("ldd failed: %s" % err)
|
|
sys.stderr.write(err)
|
|
|
|
class WrapperInfo:
|
|
def __init__(self, name, path):
|
|
self.name = name
|
|
self.path = path
|
|
self.wrappers = []
|
|
self.replaced = False
|
|
|
|
libs = {}
|
|
for l in out.split('\n'):
|
|
l = l.strip()
|
|
if not l:
|
|
continue
|
|
if re.search(r'linux-vdso|ld-linux', l):
|
|
if v > 0:
|
|
note("skipping system library: %s" % l)
|
|
continue
|
|
m = re.search(r'^lib(\S*)\.so(\.[0-9]+)? => (\S*)', l)
|
|
if m is None:
|
|
warn("failed to parse ldd output: %s" % l)
|
|
continue
|
|
name = m.group(1)
|
|
path = m.group(3)
|
|
if is_system_library(name):
|
|
if v > 0:
|
|
note("skipping system library: %s" % l)
|
|
continue
|
|
if wrap_libs and name not in wrap_libs:
|
|
if v > 0:
|
|
note("skipping library not in used-defined whitelist: %s" % l)
|
|
continue
|
|
if no_wrap_libs and name in no_wrap_libs:
|
|
if v > 0:
|
|
note("skipping library in used-defined blacklist: %s" % l)
|
|
continue
|
|
if v > 0:
|
|
note("wrappable library: %s (%s)" % (name, path))
|
|
libs[name] = WrapperInfo(name, path)
|
|
|
|
# Compile wrappers
|
|
for _, info in sorted(libs.items()):
|
|
rc, out, err = run('implib-gen.py --outdir %s %s' % (tmpd, info.path))
|
|
if rc != 0:
|
|
error("implib-gen failed: %s" % err)
|
|
sys.stderr.write(err)
|
|
for l in out.split('\n'):
|
|
l = l.strip()
|
|
if not l:
|
|
continue
|
|
m = re.match(r'^Generating (.*)\.\.\.', l)
|
|
if m is not None:
|
|
f = m.group(1)
|
|
o, _ = os.path.splitext(f)
|
|
o += '.o'
|
|
if v > 0:
|
|
note("compiling wrapper for %s in %s" % (f, o))
|
|
rc, out, err = run('gcc -Wall -Wextra -O2 -c -o %s %s' % (o, f))
|
|
if rc != 0:
|
|
error("implib-gen failed: %s" % err)
|
|
sys.stderr.write(err)
|
|
info.wrappers.append(o)
|
|
|
|
# Relink with wrapped code
|
|
args = []
|
|
changed = False
|
|
for i in range(len(sys.argv)):
|
|
arg = sys.argv[i]
|
|
if arg == '-l':
|
|
i += 1
|
|
name = sys.argv[i]
|
|
elif arg.startswith('-l'):
|
|
name = arg[2:]
|
|
else:
|
|
args.append(arg)
|
|
continue
|
|
if is_system_library(name):
|
|
args.append(arg)
|
|
continue
|
|
info = libs.get(name)
|
|
if info is None:
|
|
args.append(arg)
|
|
continue
|
|
for o in info.wrappers:
|
|
changed = True
|
|
args.append(o)
|
|
info.replaced = True
|
|
if changed:
|
|
args.append('-ldl')
|
|
|
|
for name, info in sorted(libs.items()):
|
|
if not info.replaced:
|
|
warn("failed to replace library %s")
|
|
|
|
rc, out, err = run(args)
|
|
sys.stdout.write(out)
|
|
sys.stderr.write(err)
|
|
sys.exit(rc)
|
|
|
|
if __name__ == '__main__':
|
|
main()
|