author Mike Hommey <mh+mozilla@glandium.org>
Wed, 20 Mar 2013 20:11:16 +0100
changeset 125681 1da324d86a59599e04de6f6fadf6f1aaf73fc7c4
parent 100112 41f7e82c794c9ec73dbe0c343a60bebc4d2d9615
permissions -rw-r--r--
Bug 852950 - Use signature sniffing for Elf and Mach-O binaries for dependentlibs.py. r=ted

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

'''Given a library, dependentlibs.py prints the list of libraries it depends
upon that are in the same directory.

from optparse import OptionParser
import os
import re
import fnmatch
import subprocess
import sys
from mozpack.executables import (


def dependentlibs_dumpbin(lib):
    '''Returns the list of dependencies declared in the given DLL'''
        proc = subprocess.Popen(['dumpbin', '-dependents', lib], stdout = subprocess.PIPE)
    except OSError:
        # dumpbin is missing, probably mingw compilation. Try using objdump.
        return dependentlibs_mingw_objdump(lib)
    deps = []
    for line in proc.stdout:
        # Each line containing an imported library name starts with 4 spaces
        match = re.match('    (\S+)', line)
        if match:
        elif len(deps):
             # There may be several groups of library names, but only the
             # first one is interesting. The second one is for delayload-ed
             # libraries.
    return deps

def dependentlibs_mingw_objdump(lib):
    proc = subprocess.Popen(['objdump', '-x', lib], stdout = subprocess.PIPE)
    deps = []
    for line in proc.stdout:
        match = re.match('\tDLL Name: (\S+)', line)
        if match:
    return deps

def dependentlibs_readelf(lib):
    '''Returns the list of dependencies declared in the given ELF .so'''
    proc = subprocess.Popen([TOOLCHAIN_PREFIX + 'readelf', '-d', lib], stdout = subprocess.PIPE)
    deps = []
    for line in proc.stdout:
        # Each line has the following format:
        #  tag (TYPE)          value
        # Looking for NEEDED type entries
        tmp = line.split(' ', 3)
        if len(tmp) > 3 and tmp[2] == '(NEEDED)':
            # NEEDED lines look like:
            # 0x00000001 (NEEDED)             Shared library: [libname]
            match = re.search('\[(.*)\]', tmp[3])
            if match:
    return deps

def dependentlibs_otool(lib):
    '''Returns the list of dependencies declared in the given MACH-O dylib'''
    proc = subprocess.Popen(['otool', '-l', lib], stdout = subprocess.PIPE)
    deps= []
    cmd = None
    for line in proc.stdout:
        # otool -l output contains many different things. The interesting data
        # is under "Load command n" sections, with the content:
        #           cmd LC_LOAD_DYLIB
        #       cmdsize 56
        #          name libname (offset 24)
        tmp = line.split()
        if len(tmp) < 2:
        if tmp[0] == 'cmd':
            cmd = tmp[1]
        elif cmd == 'LC_LOAD_DYLIB' and tmp[0] == 'name':
    return deps

def dependentlibs(lib, libpaths, func):
    '''For a given library, returns the list of recursive dependencies that can
    be found in the given list of paths'''
    assert(isinstance(libpaths, list))
    deps = []
    for dep in func(lib):
        if dep in deps or os.path.isabs(dep):
        for dir in libpaths:
            deppath = os.path.join(dir, dep)
            if os.path.exists(deppath):
                deps.extend([d for d in dependentlibs(deppath, libpaths, func) if not d in deps])

    return deps

def main():
    parser = OptionParser()
    parser.add_option("-L", dest="libpaths", action="append", metavar="PATH", help="Add the given path to the library search path")
    parser.add_option("-p", dest="toolchain_prefix", metavar="PREFIX", help="Use the given prefix to readelf")
    (options, args) = parser.parse_args()
    if options.toolchain_prefix:
        global TOOLCHAIN_PREFIX
        TOOLCHAIN_PREFIX = options.toolchain_prefix
    lib = args[0]
    binary_type = get_type(lib)
    if binary_type == ELF:
        func = dependentlibs_readelf
    elif binary_type == MACHO:
        func = dependentlibs_otool
        ext = os.path.splitext(lib)[1]
        assert(ext == '.dll')
        func = dependentlibs_dumpbin
    if not options.libpaths:
        options.libpaths = [os.path.dirname(lib)]

    print '\n'.join(dependentlibs(lib, options.libpaths, func))

if __name__ == '__main__':