Using NDK-STACK to Debug Cocos2dx Android Project

‘ndk-stack’ is a simple tool that allows you to analyze stack traces as they appear in the output of ‘adb logcat’ and replace any address inside a shared library with the corresponding:values.

In the output of ‘adb logcat’, you may see something like the followings, and we must translate those:

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/crasherI/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):

How to use this tool

If you succeed in building Cocos2d-x android project, it will generate shared libraries in $PROJECT_PATH/obj/local/abi, where ‘abi’ stands for your device’s ABI (i.e.’armeabi’ by default);

You can feed the logcat text either as direct input to the program, e.g.:

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

Or you can use the -dump option to specify the logcat as an input file, e.g.:

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

After that, you will get the more readable output:

********** 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

IMPORTANT

The tool looks for the initial line containing starts in the logcat output, i.e.something this looks like:

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

When copy/pasting traces, don’t forget this line from the traces, or ndk-stack won’t work correctly.

Now both the versions(linux/windows/mac) of ndk-stack are available at Android Developer .

References

$NDK_ROOT/docs/NDK-STACK.html