[Play to cocos2d-x 38] How to Use NDK-STACK tool to restore Cocos2d-x Android error stack information

 

1. android NDK-STACK toolNDK-Stack is a very easy-to-use tool that displays information to adb logcat to help you analyze Stack tracing, and then use the corresponding value (which line of the source code) to replace the address in the static Link Library.
In the output area of adb logcat, You can see information similar to the following, but before that, we must first parse it.

I/DEBUG   (   31): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***I/DEBUG   (   31): Build fingerprint: 'generic/google_sdk/generic/:2.2/FRF91/43546:eng/test-keys'I/DEBUG   (   31): pid: 351, tid: 351  %gt;%gt;%gt; /data/local/ndk-tests/crasher <<<I/DEBUG   (   31): signal 11 (SIGSEGV), fault addr 0d9f00d8I/DEBUG   (   31):  r0 0000af88  r1 0000a008  r2 baadf00d  r3 0d9f00d8I/DEBUG   (   31):  r4 00000004  r5 0000a008  r6 0000af88  r7 00013c44I/DEBUG   (   31):  r8 00000000  r9 00000000  10 00000000  fp 00000000I/DEBUG   (   31):  ip 0000959c  sp be956cc8  lr 00008403  pc 0000841e  cpsr 60000030I/DEBUG   (   31):          #00  pc 0000841e  /data/local/ndk-tests/crasherI/DEBUG   (   31):          #01  pc 000083fe  /data/local/ndk-tests/crasherI/DEBUG   (   31):          #02  pc 000083f6  /data/local/ndk-tests/crasherI/DEBUG   (   31):          #03  pc 000191ac  /system/lib/libc.soI/DEBUG   (   31):          #04  pc 000083ea  /data/local/ndk-tests/crasherI/DEBUG   (   31):          #05  pc 00008458  /data/local/ndk-tests/crasherI/DEBUG   (   31):          #06  pc 0000d362  /system/lib/libc.soI/DEBUG   (   31):

2. How to use this tool? If you successfully compile an android Cocos2d-x project, it will produce a static link library under the $ PROJECT_PATH/obj/local/directory, this indicates the ABI of your device (for example, the default value is armeabi ).

You can use the output result as the input, as shown below:

 

adb logcat | $NDK/ndk-stack -sym $PROJECT_PATH/obj/local/armeabi

 

Alternatively, you can use the-dump option to save the specified logcat as a file as the input, as shown below:

 

adb logcat > /tmp/foo.txt$NDK/ndk-stack -sym $PROJECT_PATH/obj/local/armeabi -dump foo.txt

 

Finally, you can get more valid and readable output information:

 

********** Crash dump: **********Build fingerprint: 'generic/google_sdk/generic/:2.2/FRF91/43546:eng/test-keys'pid: 351, tid: 351  >>> /data/local/ndk-tests/crasher <<<signal 11 (SIGSEGV), fault addr 0d9f00d8Stack frame #00  pc 0000841e  /data/local/ndk-tests/crasher : Routine zoo in /tmp/foo/crasher/jni/zoo.c:13Stack frame #01  pc 000083fe  /data/local/ndk-tests/crasher : Routine bar in /tmp/foo/crasher/jni/bar.c:5Stack frame #02  pc 000083f6  /data/local/ndk-tests/crasher : Routine my_comparison in /tmp/foo/crasher/jni/foo.c:9Stack frame #03  pc 000191ac  /system/lib/libc.soStack frame #04  pc 000083ea  /data/local/ndk-tests/crasher : Routine foo in /tmp/foo/crasher/jni/foo.c:14Stack frame #05  pc 00008458  /data/local/ndk-tests/crasher : Routine main in /tmp/foo/crasher/jni/main.c:19Stack frame #06  pc 0000d362  /system/lib/libc.so

 

3. Important

The logcat output of the NDK-STACK tool requires an initialization line, as shown below:

 

*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

 

When copying/pasting tracing information, do not forget to include this initialization line, otherwise the NDK-STACK tool will not work properly.
At present, for all platforms (linux/windows/mac) NDK (visible Android Developer), NDK-STACK is effective.

4. References

$ NDK_ROOT/docs/NDK-STACK.html

 

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