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

2.2 使用ndk-stack 工具， 儲存出錯log為 logcat.log, cat logcat..log | ndk-stack -sym ~/[SOURCE-DIR]/out/target/product/[PROJECT]/symbols/system/lib/ 列印呼叫堆疊

2.3 使用 panic.py(程式碼在下面) 指令碼分析並列印呼叫堆疊，/panic.py logcat.log, 注意logcat 必須轉換成以下格式

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

1. [email protected]:/meizu/JellyBean-4.2.1/trunk/out/target/product/tf4$ ./panic.py ./backtrack/setincall_path.txt  
2. read file ok  
3. AudioHardware.cpp:829         android_audio_legacy::AudioHardware::setIncallPath_l(unsigned int)  
4. AudioHardware.cpp:1537        android_audio_legacy::AudioHardware::AudioStreamOutALSA::setParameters(android::String8 const&)  
5. audio_hw_hal.cpp:197          out_set_parametersAudioFlinger.cpp:3535         android::AudioFlinger::MixerThread::checkForNewParameters_l()  
6. AudioFlinger.cpp:2586         android::AudioFlinger::PlaybackThread::threadLoop()  
7. Threads.cpp:793               android::Thread::_threadLoop(void*)  
8. Threads.cpp:132               thread_data_t::trampoline(thread_data_t const*)  
9. pthread.c:204                 __thread_entry  
10. pthread.c:348                 pthread_create  

panic.py 需要設定環境，如下：

1. #!/usr/bin/python
2. # stack symbol parser
3. import os  
4. import string  
5. import sys  
6. #define android product name
7. #ANDROID_PRODUCT_NAME = 'generic'
8. ANDROID_PRODUCT_NAME = 'ok'
9. ANDROID_WORKSPACE = os.getcwd()+"/"
10. # addr2line tool path and symbol path
11. addr2line_tool = 'arm-linux-addr2line'
12. symbol_dir = ANDROID_WORKSPACE + '/symbols'
13. symbol_bin = symbol_dir + '/system/bin/'
14. symbol_lib = symbol_dir + '/system/lib/'
15. class ReadLog:  
16.     def __init__(self,filename):  
17.         self.logname = filename  
18.     def parse(self):  
19.         f = file(self.logname,'r')  
20.         lines = f.readlines()  
21.         if lines != []:  
22.             print'read file ok'
23.         else:  
24.             print'read file failed'
25.         result =[]  
26.         for line in lines:  
27.             if line.find('stack') != -1:  
28.                 print'stop search'
29.                 break
30.             elif line.find('system') != -1:  
31.                 #print 'find one item' + line
32.                 result.append(line)  
33.         return result  
34. class ParseContent:  
35.     def __init__(self,addr,lib):  
36.             self.address = addr # pc address
37.             self.exename = lib  # executable or shared library
38.     def addr2line(self):  
39.         cmd = addr2line_tool + " -C -f -s -e " + symbol_dir + self.exename + " " + self.address  
40.         #print cmd
41.         stream = os.popen(cmd)  
42.         lines = stream.readlines();  
43.         list = map(string.strip,lines)  
44.         return list  
45. inputarg = sys.argv  
46. if len(inputarg) < 2:  
47.     print'Please input panic log'
48.     exit()  
49. filename = inputarg[1]  
50. readlog = ReadLog(filename)  
51. inputlist = readlog.parse()  
52. for item in inputlist:  
53.     itemsplit = item.split()  
54.     test = ParseContent(itemsplit[-2],itemsplit[-1])  
55.     list = test.addr2line()  
56.     print"%-30s%s" % (list[1],list[0])  

3.1 在cpp檔案新增如下資訊

1. #include <utils/CallStack.h>
2. ...  
3. status_t AudioHardware::setIncallPath_l(uint32_t device) {  
4. ...  
5. #ifdef _ARM_
6.     android::CallStack stack;  
7.     stack.update(1, 100);  
8.     stack.dump("");  
9. #endif
10. ...  
11. }  

這樣將會列印上面所述的呼叫資訊，便於分析程式碼，debug，定位問題。