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# 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, followed by the library itself.
"""
import os
import re
import subprocess
import sys
import mozpack.path as mozpath
from collections import OrderedDict
from mozpack.executables import (
get_type,
ELF,
MACHO,
)
from buildconfig import substs
def dependentlibs_win32_objdump(lib):
proc = subprocess.Popen(
[substs["LLVM_OBJDUMP"], "--private-headers", lib],
stdout=subprocess.PIPE,
universal_newlines=True,
)
deps = []
for line in proc.stdout:
match = re.match(r"\s+DLL Name: (\S+)", line)
if match:
# The DLL Name found might be mixed-case or upper-case. When cross-compiling,
# the actual DLLs in dist/bin are all lowercase, whether they are produced
# by the build system or copied from WIN32_REDIST_DIR. By turning everything
# to lowercase, we ensure we always find the files.
# At runtime, when Firefox reads the dependentlibs.list file on Windows, the
# case doesn't matter.
deps.append(match.group(1).lower())
proc.wait()
return deps
def dependentlibs_readelf(lib):
"""Returns the list of dependencies declared in the given ELF .so"""
proc = subprocess.Popen(
[substs.get("READELF", "readelf"), "-d", lib],
stdout=subprocess.PIPE,
universal_newlines=True,
)
deps = []
for line in proc.stdout:
# Each line has the following format:
# tag (TYPE) value
# or with BSD readelf:
# tag TYPE value
# Looking for NEEDED type entries
tmp = line.strip().split(" ", 3)
if len(tmp) > 3 and "NEEDED" in tmp[1]:
# NEEDED lines look like:
# 0x00000001 (NEEDED) Shared library: [libname]
# or with BSD readelf:
# 0x00000001 NEEDED Shared library: [libname]
match = re.search(r"\[(.*)\]", tmp[3])
if match:
deps.append(match.group(1))
proc.wait()
return deps
def dependentlibs_mac_objdump(lib):
"""Returns the list of dependencies declared in the given MACH-O dylib"""
proc = subprocess.Popen(
[substs["LLVM_OBJDUMP"], "--private-headers", lib],
stdout=subprocess.PIPE,
universal_newlines=True,
)
deps = []
cmd = None
for line in proc.stdout:
# llvm-objdump --private-headers 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:
continue
if tmp[0] == "cmd":
cmd = tmp[1]
elif cmd == "LC_LOAD_DYLIB" and tmp[0] == "name":
deps.append(re.sub("@(?:rpath|executable_path)/", "", tmp[1]))
proc.wait()
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, followed by the library itself."""
assert libpaths
assert isinstance(libpaths, list)
deps = OrderedDict()
for dep in func(lib):
if dep in deps or os.path.isabs(dep):
continue
for dir in libpaths:
deppath = os.path.join(dir, dep)
if os.path.exists(deppath):
deps.update(dependentlibs(deppath, libpaths, func))
# Black list the ICU data DLL because preloading it at startup
# leads to startup performance problems because of its excessive
# size (around 10MB).
if not dep.startswith(("icu")):
deps[dep] = deppath
break
return deps
def gen_list(output, lib):
libpaths = [os.path.join(substs["DIST"], "bin")]
binary_type = get_type(lib)
if binary_type == ELF:
func = dependentlibs_readelf
elif binary_type == MACHO:
func = dependentlibs_mac_objdump
else:
ext = os.path.splitext(lib)[1]
assert ext == ".dll"
func = dependentlibs_win32_objdump
deps = dependentlibs(lib, libpaths, func)
base_lib = mozpath.basename(lib)
deps[base_lib] = mozpath.join(libpaths[0], base_lib)
output.write("\n".join(deps.keys()) + "\n")
with open(output.name + ".gtest", "w") as gtest_out:
libs = list(deps.keys())
libs[-1] = "gtest/" + libs[-1]
gtest_out.write("\n".join(libs) + "\n")
return set(deps.values())
def main():
gen_list(sys.stdout, sys.argv[1])
if __name__ == "__main__":
main()
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