很多童鞋在糾結(jié)在Cocos2d-x中安卓項(xiàng)目如何調(diào)試JNI部分的C++代碼，在吃完2個(gè)茶葉蛋后我決定放大招。。。

本文翻譯自： http://www.cocos2d-x.org/forums/6/topics/46225

1.安卓 NDK-STACK tool

NDK-Stack 是一個(gè)非常易用的工具，它通過將信息顯示到adb logcat中來輔助你分析堆棧追蹤，然后用相應(yīng)的值（哪篇源碼的哪一行）來替代靜態(tài)鏈接庫(kù)中的地址。
在adb logcat的輸出區(qū)，你可以看到類似下面的信息，但是在此之前我們必須先先對(duì)它進(jìn)行解析。
[cpp]?view plaincopy

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?0d9f00d8??

I/DEBUG???(???31):??r0?0000af88??r1?0000a008??r2?baadf00d??r3?0d9f00d8??

I/DEBUG???(???31):??r4?00000004??r5?0000a008??r6?0000af88??r7?00013c44??

I/DEBUG???(???31):??r8?00000000??r9?00000000??10?00000000??fp?00000000??

I/DEBUG???(???31):??ip?0000959c??sp?be956cc8??lr?00008403??pc?0000841e??cpsr?60000030??

I/DEBUG???(???31):??????????#00??pc?0000841e??/data/local/ndk-tests/crasher??

I/DEBUG???(???31):??????????#01??pc?000083fe??/data/local/ndk-tests/crasher??

I/DEBUG???(???31):??????????#02??pc?000083f6??/data/local/ndk-tests/crasher??

I/DEBUG???(???31):??????????#03??pc?000191ac??/system/lib/libc.so??

I/DEBUG???(???31):??????????#04??pc?000083ea??/data/local/ndk-tests/crasher??

I/DEBUG???(???31):??????????#05??pc?00008458??/data/local/ndk-tests/crasher??

I/DEBUG???(???31):??????????#06??pc?0000d362??/system/lib/libc.so??

I/DEBUG???(???31):??

2.如何使用這個(gè)工具？

如果你成功地編譯了一個(gè)Cocos2d-x安卓項(xiàng)目，它將會(huì)在$PROJECT_PATH/obj/local/<abi>目錄下生產(chǎn)一個(gè)靜態(tài)鏈接庫(kù)，這里的<abi>代表你的設(shè)備的ABI（比如，默認(rèn)為armeabi）。

你可以將輸出結(jié)果作為輸入，就像下面這樣：

[cpp]?view plaincopy

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

或者你也可以使用 -dump選項(xiàng)將指定logcat保存為文件作為輸入，就像下面這樣：

[cpp]?view plaincopy

adb?logcat?>?/tmp/foo.txt??

$NDK/ndk-stack?-sym?$PROJECT_PATH/obj/local/armeabi?-dump?foo.txt??

最后，你就可以得到更多有效可讀的輸出信息：

[cpp]?view plaincopy

**********?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?0d9f00d8??

Stack?frame?#00??pc?0000841e??/data/local/ndk-tests/crasher?:?Routine?zoo?in?/tmp/foo/crasher/jni/zoo.c:13??

Stack?frame?#01??pc?000083fe??/data/local/ndk-tests/crasher?:?Routine?bar?in?/tmp/foo/crasher/jni/bar.c:5??

Stack?frame?#02??pc?000083f6??/data/local/ndk-tests/crasher?:?Routine?my_comparison?in?/tmp/foo/crasher/jni/foo.c:9??

Stack?frame?#03??pc?000191ac??/system/lib/libc.so??

Stack?frame?#04??pc?000083ea??/data/local/ndk-tests/crasher?:?Routine?foo?in?/tmp/foo/crasher/jni/foo.c:14??

Stack?frame?#05??pc?00008458??/data/local/ndk-tests/crasher?:?Routine?main?in?/tmp/foo/crasher/jni/main.c:19??

Stack?frame?#06??pc?0000d362??/system/lib/libc.so??

3.重要提示

NDK-STACK tool的logcat輸出需要有一個(gè)初始化行，比如像下面這樣：

[cpp]?view plaincopy

***?***?***?***?***?***?***?***?***?***?***?***?***?***?***?***??

當(dāng)復(fù)制/粘帖追蹤信息時(shí)，不要忘記把這個(gè)初始化行也給帶上，否則NDK-STACK tool將不會(huì)正常的工作。
目前對(duì)各平臺(tái)（linux/windows/mac）的NDK（可見 Android Developer ），NDK-STACK都是有效的。

4.參考文檔

$NDK_ROOT/docs/NDK-STACK.html

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