跟踪Android callback 调用堆栈

quasiceo 2014-09-04

展开全文

跟踪Android callback 调用堆栈

分类： Android 2013-08-31 11:40 1648人阅读评论(0) 收藏举报

0 在调试 android 系统时可以通过打印调用堆栈 callback stack 来分析和解决android问题。

1 java 层打印callback stack 可以通过 catch exception 然后使用 Log.w(LOGTAG, Log.getStackTraceString(throwable)) 打印调用堆栈

Throwable throwable = new Throwable();
Log.w(LOGTAG, Log.getStackTraceString(throwable));

或者

try {
wait();
} catch (InterruptedException e) {
Log.e(LOGTAG, "Caught exception while waiting for overrideUrl");
Log.e(LOGTAG, Log.getStackTraceString(e));
}

2 c/c++, 通常情况下，可以通过segment fault 等错误即信号 SIGSEGV(11) 做出相应处理，即设置SIGSEGV的handler调用libc的backtrace，即可打印对于的callback stack；定位问题所在；但在android 中， bionic 不提供类似功能，而且只能通过logcat才能看到log信息，但是我们也可以根据android出错信息获得调用堆栈信息，如以下出错信息：

D/CallStack( 2029): #00 pc 00008156 /system/lib/hw/audio.primary.tf4.so
D/CallStack( 2029): #01 pc 000089e8 /system/lib/hw/audio.primary.tf4.so (android_audio_legacy::AudioHardware::AudioStreamOutALSA::setParameters(android::String const&)+139)
D/CallStack( 2029): #02 pc 0000b2ca /system/lib/hw/audio.primary.tf4.so
D/CallStack( 2029): #03 pc 0003ac6a /system/lib/libaudioflinger.so (android::AudioFlinger::MixerThread::checkForNewParameters_l()+377)
D/CallStack( 2029): #04 pc 0003960a /system/lib/libaudioflinger.so (android::AudioFlinger::PlaybackThread::threadLoop()+145)
D/CallStack( 2029): #05 pc 00011264 /system/lib/libutils.so (android::Thread::_threadLoop(void*)+111)
D/CallStack( 2029): #06 pc 00010dca /system/lib/libutils.so
D/CallStack( 2029): #07 pc 0000e3f8 /system/lib/libc.so (__thread_entry+72)
D/CallStack( 2029): #08 pc 0000dae4 /system/lib/libc.so (pthread_create+160)

2.1 可以使用 arm-linux-addr2line 获得调用堆栈，arm-eabi-addr2line -C -f -e symbols/system/lib/*.so addr, 这样就可以打印出调用堆栈信息了。

2.2 使用ndk-stack 工具，保存出错log为 logcat.log, cat logcat..log | ndk-stack -sym ~/[SOURCE-DIR]/out/target/product/[PROJECT]/symbols/system/lib/ 打印调用堆栈

2.3 使用 panic.py(代码在下面) 脚本分析并打印调用堆栈，/panic.py logcat.log, 注意logcat 必须转换成以下格式

D/CallStack( 2029): #00 pc 00008156 /system/lib/hw/audio.primary.tf4.so
D/CallStack( 2029): #01 pc 000089e8 /system/lib/hw/audio.primary.tf4.so
D/CallStack( 2029): #02 pc 0000b2ca /system/lib/hw/audio.primary.tf4.so
D/CallStack( 2029): #03 pc 0003ac6a /system/lib/libaudioflinger.so
D/CallStack( 2029): #04 pc 0003960a /system/lib/libaudioflinger.so
D/CallStack( 2029): #05 pc 00011264 /system/lib/libutils.so
D/CallStack( 2029): #06 pc 00010dca /system/lib/libutils.so
D/CallStack( 2029): #07 pc 0000e3f8 /system/lib/libc.so
D/CallStack( 2029): #08 pc 0000dae4 /system/lib/libc.so

这样执行脚本 ./panic.py setincallpath_l.txt, 打印定位信息：

w@w:/meizu/JellyBean-4.2.1/trunk/out/target/product/tf4$ ./panic.py ./backtrack/setincall_path.txt
read file ok
AudioHardware.cpp:829 android_audio_legacy::AudioHardware::setIncallPath_l(unsigned int)
AudioHardware.cpp:1537 android_audio_legacy::AudioHardware::AudioStreamOutALSA::setParameters(android::String8 const&)
audio_hw_hal.cpp:197 out_set_parametersAudioFlinger.cpp:3535 android::AudioFlinger::MixerThread::checkForNewParameters_l()
AudioFlinger.cpp:2586 android::AudioFlinger::PlaybackThread::threadLoop()
Threads.cpp:793 android::Thread::_threadLoop(void*)
Threads.cpp:132 thread_data_t::trampoline(thread_data_t const*)
pthread.c:204 __thread_entry
pthread.c:348 pthread_create

2.4 google提供了一个python脚本，可以从 http://code.google.com/p/android-ndk-stacktrace-analyzer/ 下载这个python脚本，然后使用
adb logcat -d > logfile 导出 crash 的log,
使用 arm-eabi-objdump (位于build/prebuilt/linux-x86/arm-eabi-4.2.1/bin下面)把so或exe转换成汇编代码，如：
arm-eabi-objdump -S mylib.so > mylib.asm,
然后使用脚本
python parse_stack.py <asm-file> <logcat-file>

panic.py 需要设置环境，如下：

#!/usr/bin/python
# stack symbol parser
import os
import string
import sys
#define android product name
#ANDROID_PRODUCT_NAME = 'generic'
ANDROID_PRODUCT_NAME = 'ok'
ANDROID_WORKSPACE = os.getcwd()+"/"
# addr2line tool path and symbol path
addr2line_tool = 'arm-linux-addr2line'
symbol_dir = ANDROID_WORKSPACE + '/symbols'
symbol_bin = symbol_dir + '/system/bin/'
symbol_lib = symbol_dir + '/system/lib/'
class ReadLog:
def __init__(self,filename):
self.logname = filename
def parse(self):
f = file(self.logname,'r')
lines = f.readlines()
if lines != []:
print 'read file ok'
else:
print 'read file failed'
result =[]
for line in lines:
if line.find('stack') != -1:
print 'stop search'
break
elif line.find('system') != -1:
#print 'find one item' + line
result.append(line)
return result
class ParseContent:
def __init__(self,addr,lib):
self.address = addr # pc address
self.exename = lib # executable or shared library
def addr2line(self):
cmd = addr2line_tool + " -C -f -s -e " + symbol_dir + self.exename + " " + self.address
#print cmd
stream = os.popen(cmd)
lines = stream.readlines();
list = map(string.strip,lines)
return list
inputarg = sys.argv
if len(inputarg) < 2:
print 'Please input panic log'
exit()
filename = inputarg[1]
readlog = ReadLog(filename)
inputlist = readlog.parse()
for item in inputlist:
itemsplit = item.split()
test = ParseContent(itemsplit[-2],itemsplit[-1])
list = test.addr2line()
print "%-30s%s" % (list[1],list[0])