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介紹Android符號表的基礎概念，以及如何找到符號表并上傳。

一、什么是符號表

在Android平臺上，符號表用于將混淆過的代碼進行還原，其中Java代碼的符號化文件是mapping文件，C/C++代碼的符號化文件是SO文件。

1. mapping文件

mapping文件可用于對混淆后的Java Crash堆棧進行還原。

原始堆棧

java.lang.NullPointerException
	at com.aliyun.emas.android.apm.CrashActivity$o.a(CrashActivity.java:1)
	at com.aliyun.emas.android.apm.CrashActivity$f.onClick(CrashActivity.java:1)
	at android.view.View.performClick(View.java:7751)
	at android.view.View.performClickInternal(View.java:7724)
	at android.view.View.access$3700(View.java:858)
	at android.view.View$PerformClick.run(View.java:29336)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:211)
	at android.os.Looper.loop(Looper.java:300)
	at android.app.ActivityThread.main(ActivityThread.java:8285)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:576)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1074)

還原堆棧

java.lang.NullPointerException
	at com.aliyun.emas.android.apm.CrashActivity$JavaCrash.throwException(CrashActivity.java:281)
	at com.aliyun.emas.android.apm.CrashActivity$1.onClick(CrashActivity.java:54)
	at android.view.View.performClick(View.java:7778)
	at android.view.View.performClickInternal(View.java:7755)
	at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
	at android.view.View$PerformClick.run(View.java:30769)
	at android.os.Handler.handleCallback(Handler.java:1013)
	at android.os.Handler.dispatchMessage(Handler.java:101)
	at android.os.Looper.loopOnce(Looper.java:226)
	at android.os.Looper.loop(Looper.java:328)
	at android.app.ActivityThread.main(ActivityThread.java:9179)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:594)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
Back traces end.

2. SO符號表

SO符號表是用來存儲源代碼中符號信息的數據結構，符號表元素如下所示：

<起始地址> <結束地址> <函數> [<文件名：行號>]

SO符號表可用于對Native Crash堆棧進行還原。

原始堆棧

#00 pc 000000000000f224  /data/app/~~z7k3Yi_OI3CSgGIlRwLTAA==/com.aliyun.ha.test_8-kjF3YBAA72Ed6Q0gg9U7fQ==/lib/arm64/libnativecrash.so (_Z4testv+20)
#01 pc 000000000000f200  /data/app/~~z7k3Yi_OI3CSgGIlRwLTAA==/com.aliyun.ha.test_8-kjF3YBAA72Ed6Q0gg9U7fQ==/lib/arm64/libnativecrash.so (Java_com_example_nativecrash_NativeLib_mockSigSegv+20)
#02 pc 0000000000022244  /apex/com.android.art/lib64/libart.so (art_quick_generic_jni_trampoline+148)
#03 pc 0000000000018964  /apex/com.android.art/lib64/libart.so (art_quick_invoke_stub+548)
#04 pc 00000000000845a8  /apex/com.android.art/lib64/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+188)
#05 pc 00000000001fd680  /apex/com.android.art/lib64/libart.so (_ZN3art11interpreter34ArtInterpreterToCompiledCodeBridgeEPNS_6ThreadEPNS_9ArtMethodEPNS_11ShadowFrameEtPNS_6JValueE+400)
#06 pc 00000000001f84f4  /apex/com.android.art/lib64/libart.so (_ZN3art11interpreter6DoCallILb0ELb0EEEbPNS_9ArtMethodEPNS_6ThreadERNS_11ShadowFrameEPKNS_11InstructionEtPNS_6JValueE+804)
#07 pc 0000000000595d50  /apex/com.android.art/lib64/libart.so (MterpInvokeVirtual+1168)
#08 pc 0000000000003814  /apex/com.android.art/lib64/libart.so (mterp_op_invoke_virtual+20)

還原堆棧

#00 pc 0xf224 libnativecrash.so (/Users/liubaowen/projects/temp/emas-android-appmonitor-demo/nativecrash/src/main/cpp/nativecrash.cpptest()
#01 pc 0xf200 libnativecrash.so (/Users/liubaowen/projects/temp/emas-android-appmonitor-demo/nativecrash/src/main/cpp/nativecrash.cppJava_com_example_nativecrash_NativeLib_mockSigSegv+line:17)
#02 pc 0x22244 libart.so (art_quick_generic_jni_trampoline+148)
#03 pc 0x18964 libart.so (art_quick_invoke_stub+548)
#04 pc 0x845a8 libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+188)
#05 pc 0x1fd680 libart.so (_ZN3art11interpreter34ArtInterpreterToCompiledCodeBridgeEPNS_6ThreadEPNS_9ArtMethodEPNS_11ShadowFrameEtPNS_6JValueE+400)
#06 pc 0x1f84f4 libart.so (_ZN3art11interpreter6DoCallILb0ELb0EEEbPNS_9ArtMethodEPNS_6ThreadERNS_11ShadowFrameEPKNS_11InstructionEtPNS_6JValueE+804)
#07 pc 0x595d50 libart.so (MterpInvokeVirtual+1168)
#08 pc 0x3814 libart.so (mterp_op_invoke_virtual+20)

二、如何找到符號表

1. mapping文件位置

如果在：<project>/<app-module>/build.gradle中打開了混淆，則在編譯完成后會生成mapping文件。

android {
    ...
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    ...
}

默認情況下，mapping文件位置在<project>/<app-module>/build/outputs/mapping/<build-type>/。

2. SO符號表位置

Android平臺中，Debug SO文件是指具有調試信息的SO文件，其中包含用戶還原堆棧的符號信息。

CMake編譯項目
默認情況下，編譯的SO文件在<project>/<sdk-module>/build/intermediates/cmake/<build-type>/obj/CPU架構/。
NDK編譯項目
默認情況下，編譯的SO文件在<project>/<sdk-module>/build/intermediates/ndk/<build-type>/obj/CPU架構/。