342 lines
12 KiB
Plaintext
342 lines
12 KiB
Plaintext
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#!/usr/bin/python
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# Copyright (c) 2011 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Usage: strip_save_dsym <whatever-arguments-you-would-pass-to-strip>
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#
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# strip_save_dsym is a wrapper around the standard strip utility. Given an
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# input Mach-O file, strip_save_dsym will save a copy of the file in a "fake"
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# .dSYM bundle for debugging, and then call strip to strip the Mach-O file.
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# Note that the .dSYM file is a "fake" in that it's not a self-contained
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# .dSYM bundle, it just contains a copy of the original (unstripped) Mach-O
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# file, and therefore contains references to object files on the filesystem.
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# The generated .dSYM bundle is therefore unsuitable for debugging in the
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# absence of these .o files.
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#
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# If a .dSYM already exists and has a newer timestamp than the Mach-O file,
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# this utility does nothing. That allows strip_save_dsym to be run on a file
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# that has already been stripped without trashing the .dSYM.
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#
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# Rationale: the "right" way to generate dSYM bundles, dsymutil, is incredibly
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# slow. On the other hand, doing a file copy (which is really all that
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# dsymutil does) is comparatively fast. Since we usually just want to strip
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# a release-mode executable but still be able to debug it, and we don't care
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# so much about generating a hermetic dSYM bundle, we'll prefer the file copy.
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# If a real dSYM is ever needed, it's still possible to create one by running
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# dsymutil and pointing it at the original Mach-O file inside the "fake"
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# bundle, provided that the object files are available.
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import errno
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import os
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import re
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import shutil
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import subprocess
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import sys
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import time
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# Returns a list of architectures contained in a Mach-O file. The file can be
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# a universal (fat) file, in which case there will be one list element for
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# each contained architecture, or it can be a thin single-architecture Mach-O
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# file, in which case the list will contain a single element identifying the
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# architecture. On error, returns an empty list. Determines the architecture
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# list by calling file.
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def macho_archs(macho):
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macho_types = ["executable",
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"dynamically linked shared library",
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"bundle"]
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macho_types_re = "Mach-O (?:64-bit )?(?:" + "|".join(macho_types) + ")"
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file_cmd = subprocess.Popen(["/usr/bin/file", "-b", "--", macho],
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stdout=subprocess.PIPE)
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archs = []
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type_line = file_cmd.stdout.readline()
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type_match = re.match("^%s (.*)$" % macho_types_re, type_line)
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if type_match:
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archs.append(type_match.group(1))
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return [type_match.group(1)]
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else:
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type_match = re.match("^Mach-O universal binary with (.*) architectures$",
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type_line)
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if type_match:
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for i in range(0, int(type_match.group(1))):
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arch_line = file_cmd.stdout.readline()
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arch_match = re.match(
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"^.* \(for architecture (.*)\):\t%s .*$" % macho_types_re,
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arch_line)
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if arch_match:
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archs.append(arch_match.group(1))
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if file_cmd.wait() != 0:
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archs = []
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if len(archs) == 0:
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print >> sys.stderr, "No architectures in %s" % macho
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return archs
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# Returns a dictionary mapping architectures contained in the file as returned
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# by macho_archs to the LC_UUID load command for that architecture.
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# Architectures with no LC_UUID load command are omitted from the dictionary.
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# Determines the UUID value by calling otool.
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def macho_uuids(macho):
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uuids = {}
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archs = macho_archs(macho)
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if len(archs) == 0:
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return uuids
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for arch in archs:
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if arch == "":
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continue
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otool_cmd = subprocess.Popen(["/usr/bin/otool", "-arch", arch, "-l", "-",
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macho],
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stdout=subprocess.PIPE)
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# state 0 is when nothing UUID-related has been seen yet. State 1 is
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# entered after a load command begins, but it may not be an LC_UUID load
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# command. States 2, 3, and 4 are intermediate states while reading an
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# LC_UUID command. State 5 is the terminal state for a successful LC_UUID
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# read. State 6 is the error state.
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state = 0
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uuid = ""
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for otool_line in otool_cmd.stdout:
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if state == 0:
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if re.match("^Load command .*$", otool_line):
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state = 1
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elif state == 1:
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if re.match("^ cmd LC_UUID$", otool_line):
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state = 2
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else:
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state = 0
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elif state == 2:
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if re.match("^ cmdsize 24$", otool_line):
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state = 3
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else:
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state = 6
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elif state == 3:
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# The UUID display format changed in the version of otool shipping
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# with the Xcode 3.2.2 prerelease. The new format is traditional:
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# uuid 4D7135B2-9C56-C5F5-5F49-A994258E0955
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# and with Xcode 3.2.6, then line is indented one more space:
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# uuid 4D7135B2-9C56-C5F5-5F49-A994258E0955
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# The old format, from cctools-750 and older's otool, breaks the UUID
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# up into a sequence of bytes:
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# uuid 0x4d 0x71 0x35 0xb2 0x9c 0x56 0xc5 0xf5
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# 0x5f 0x49 0xa9 0x94 0x25 0x8e 0x09 0x55
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new_uuid_match = re.match("^ {3,4}uuid (.{8}-.{4}-.{4}-.{4}-.{12})$",
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otool_line)
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if new_uuid_match:
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uuid = new_uuid_match.group(1)
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# Skip state 4, there is no second line to read.
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state = 5
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else:
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old_uuid_match = re.match("^ uuid 0x(..) 0x(..) 0x(..) 0x(..) "
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"0x(..) 0x(..) 0x(..) 0x(..)$",
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otool_line)
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if old_uuid_match:
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state = 4
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uuid = old_uuid_match.group(1) + old_uuid_match.group(2) + \
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old_uuid_match.group(3) + old_uuid_match.group(4) + "-" + \
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old_uuid_match.group(5) + old_uuid_match.group(6) + "-" + \
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old_uuid_match.group(7) + old_uuid_match.group(8) + "-"
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else:
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state = 6
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elif state == 4:
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old_uuid_match = re.match("^ 0x(..) 0x(..) 0x(..) 0x(..) "
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"0x(..) 0x(..) 0x(..) 0x(..)$",
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otool_line)
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if old_uuid_match:
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state = 5
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uuid += old_uuid_match.group(1) + old_uuid_match.group(2) + "-" + \
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old_uuid_match.group(3) + old_uuid_match.group(4) + \
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old_uuid_match.group(5) + old_uuid_match.group(6) + \
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old_uuid_match.group(7) + old_uuid_match.group(8)
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else:
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state = 6
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if otool_cmd.wait() != 0:
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state = 6
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if state == 5:
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uuids[arch] = uuid.upper()
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if len(uuids) == 0:
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print >> sys.stderr, "No UUIDs in %s" % macho
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return uuids
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# Given a path to a Mach-O file and possible information from the environment,
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# determines the desired path to the .dSYM.
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def dsym_path(macho):
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# If building a bundle, the .dSYM should be placed next to the bundle. Use
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# WRAPPER_NAME to make this determination. If called from xcodebuild,
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# WRAPPER_NAME will be set to the name of the bundle.
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dsym = ""
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if "WRAPPER_NAME" in os.environ:
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if "BUILT_PRODUCTS_DIR" in os.environ:
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dsym = os.path.join(os.environ["BUILT_PRODUCTS_DIR"],
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os.environ["WRAPPER_NAME"])
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else:
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dsym = os.environ["WRAPPER_NAME"]
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else:
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dsym = macho
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dsym += ".dSYM"
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return dsym
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# Creates a fake .dSYM bundle at dsym for macho, a Mach-O image with the
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# architectures and UUIDs specified by the uuids map.
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def make_fake_dsym(macho, dsym):
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uuids = macho_uuids(macho)
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if len(uuids) == 0:
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return False
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dwarf_dir = os.path.join(dsym, "Contents", "Resources", "DWARF")
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dwarf_file = os.path.join(dwarf_dir, os.path.basename(macho))
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try:
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os.makedirs(dwarf_dir)
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except OSError, (err, error_string):
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if err != errno.EEXIST:
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raise
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shutil.copyfile(macho, dwarf_file)
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# info_template is the same as what dsymutil would have written, with the
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# addition of the fake_dsym key.
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info_template = \
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'''<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>CFBundleDevelopmentRegion</key>
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<string>English</string>
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<key>CFBundleIdentifier</key>
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<string>com.apple.xcode.dsym.%(root_name)s</string>
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<key>CFBundleInfoDictionaryVersion</key>
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<string>6.0</string>
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<key>CFBundlePackageType</key>
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<string>dSYM</string>
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<key>CFBundleSignature</key>
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<string>????</string>
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<key>CFBundleShortVersionString</key>
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<string>1.0</string>
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<key>CFBundleVersion</key>
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<string>1</string>
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<key>dSYM_UUID</key>
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<dict>
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%(uuid_dict)s </dict>
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<key>fake_dsym</key>
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<true/>
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</dict>
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</plist>
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'''
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root_name = os.path.basename(dsym)[:-5] # whatever.dSYM without .dSYM
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uuid_dict = ""
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for arch in sorted(uuids):
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uuid_dict += "\t\t\t<key>" + arch + "</key>\n"\
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"\t\t\t<string>" + uuids[arch] + "</string>\n"
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info_dict = {
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"root_name": root_name,
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"uuid_dict": uuid_dict,
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}
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info_contents = info_template % info_dict
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info_file = os.path.join(dsym, "Contents", "Info.plist")
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info_fd = open(info_file, "w")
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info_fd.write(info_contents)
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info_fd.close()
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return True
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# For a Mach-O file, determines where the .dSYM bundle should be located. If
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# the bundle does not exist or has a modification time older than the Mach-O
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# file, calls make_fake_dsym to create a fake .dSYM bundle there, then strips
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# the Mach-O file and sets the modification time on the .dSYM bundle and Mach-O
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# file to be identical.
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def strip_and_make_fake_dsym(macho):
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dsym = dsym_path(macho)
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macho_stat = os.stat(macho)
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dsym_stat = None
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try:
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dsym_stat = os.stat(dsym)
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except OSError, (err, error_string):
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if err != errno.ENOENT:
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raise
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if dsym_stat is None or dsym_stat.st_mtime < macho_stat.st_mtime:
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# Make a .dSYM bundle
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if not make_fake_dsym(macho, dsym):
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return False
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# Strip the Mach-O file
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remove_dsym = True
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try:
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strip_path = ""
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if "SYSTEM_DEVELOPER_BIN_DIR" in os.environ:
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strip_path = os.environ["SYSTEM_DEVELOPER_BIN_DIR"]
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else:
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strip_path = "/usr/bin"
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strip_path = os.path.join(strip_path, "strip")
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strip_cmdline = [strip_path] + sys.argv[1:]
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strip_cmd = subprocess.Popen(strip_cmdline)
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if strip_cmd.wait() == 0:
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remove_dsym = False
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finally:
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if remove_dsym:
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shutil.rmtree(dsym)
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# Update modification time on the Mach-O file and .dSYM bundle
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now = time.time()
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os.utime(macho, (now, now))
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os.utime(dsym, (now, now))
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return True
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def main(argv=None):
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if argv is None:
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argv = sys.argv
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# This only supports operating on one file at a time. Look at the arguments
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# to strip to figure out what the source to be stripped is. Arguments are
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# processed in the same way that strip does, although to reduce complexity,
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# this doesn't do all of the same checking as strip. For example, strip
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# has no -Z switch and would treat -Z on the command line as an error. For
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# the purposes this is needed for, that's fine.
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macho = None
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process_switches = True
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ignore_argument = False
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for arg in argv[1:]:
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if ignore_argument:
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ignore_argument = False
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continue
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if process_switches:
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if arg == "-":
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process_switches = False
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# strip has these switches accept an argument:
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if arg in ["-s", "-R", "-d", "-o", "-arch"]:
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ignore_argument = True
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if arg[0] == "-":
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continue
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if macho is None:
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macho = arg
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else:
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print >> sys.stderr, "Too many things to strip"
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return 1
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if macho is None:
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print >> sys.stderr, "Nothing to strip"
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return 1
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if not strip_and_make_fake_dsym(macho):
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return 1
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return 0
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if __name__ == "__main__":
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sys.exit(main(sys.argv))
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