Breakpad工具下载，make

1. 下载breakpad 源码，下载ssl包到 breakpad源码的third_party中去。需要翻墙

   git clone https://chromium.googlesource.com/linux-syscall-support
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2. 到源码下面编译，然后生成工具 dump_sys, minidump_stackwalk.（在src/processor下面）

./configure && make
make install
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项目引用Breakpad工程

1. 搭建module，导入breakpad源码，配置CMakeLists.txt

   cmake_minimum_required(VERSION 3.4.1)set(BREAKPAD_ROOT ${CMAKE_CURRENT_SOURCE_DIR})
   
   include_directories(${BREAKPAD_ROOT}/src ${BREAKPAD_ROOT}/src/common/android/include)file(GLOB BREAKPAD_SOURCES_COMMON${BREAKPAD_ROOT}/src/client/linux/crash_generation/crash_generation_client.cc${BREAKPAD_ROOT}/src/client/linux/dump_writer_common/thread_info.cc${BREAKPAD_ROOT}/src/client/linux/dump_writer_common/ucontext_reader.cc${BREAKPAD_ROOT}/src/client/linux/handler/exception_handler.cc${BREAKPAD_ROOT}/src/client/linux/handler/minidump_descriptor.cc${BREAKPAD_ROOT}/src/client/linux/log/log.cc${BREAKPAD_ROOT}/src/client/linux/microdump_writer/microdump_writer.cc${BREAKPAD_ROOT}/src/client/linux/minidump_writer/linux_dumper.cc${BREAKPAD_ROOT}/src/client/linux/minidump_writer/linux_ptrace_dumper.cc${BREAKPAD_ROOT}/src/client/linux/minidump_writer/minidump_writer.cc${BREAKPAD_ROOT}/src/client/minidump_file_writer.cc${BREAKPAD_ROOT}/src/common/convert_UTF.c${BREAKPAD_ROOT}/src/common/md5.cc${BREAKPAD_ROOT}/src/common/string_conversion.cc${BREAKPAD_ROOT}/src/common/linux/elfutils.cc${BREAKPAD_ROOT}/src/common/linux/file_id.cc${BREAKPAD_ROOT}/src/common/linux/guid_creator.cc${BREAKPAD_ROOT}/src/common/linux/linux_libc_support.cc${BREAKPAD_ROOT}/src/common/linux/memory_mapped_file.cc${BREAKPAD_ROOT}/src/common/linux/safe_readlink.cc)file(GLOB BREAKPAD_ASM_SOURCE ${BREAKPAD_ROOT}/src/common/android/breakpad_getcontext.S)
   
   set_source_files_properties(${BREAKPAD_ASM_SOURCE} PROPERTIES LANGUAGE C)add_library(breakpad STATIC ${BREAKPAD_SOURCES_COMMON} ${BREAKPAD_ASM_SOURCE})target_link_libraries(breakpad log)
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2. 初始化 Breakpad库

   public class BreakpadInit {static {System.loadLibrary("breakpad-core");}public static void initBreakpad(String path){initBreakpadNative(path);}private static native void initBreakpadNative(String path);
   }
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native：

bool DumpCallback(const google_breakpad::MinidumpDescriptor &descriptor,void *context,bool succeeded) {ALOGD("===============crrrrash================");ALOGD("Dump path: %s\n", descriptor.path());return succeeded;
}extern "C"
JNIEXPORT void JNICALL
Java_com_sample_breakpad_BreakpadInit_initBreakpadNative(JNIEnv *env, jclass type, jstring path_) {const char *path = env->GetStringUTFChars(path_, 0);google_breakpad::MinidumpDescriptor descriptor(path);static google_breakpad::ExceptionHandler eh(descriptor, NULL, DumpCallback, NULL, true, -1);env->ReleaseStringUTFChars(path_, path);
}JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) {JNIEnv *env;if (vm->GetEnv((void **) &env, JNI_VERSION_1_6) != JNI_OK) {return JNI_ERR;}return JNI_VERSION_1_6;
}
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1. 项目工程中，把奔溃写入到sdcard里：

    /*** 一般来说，crash捕获初始化都会放到Application中，这里主要是为了大家有机会可以把崩溃文件输         *出到sdcard中做进一步的分析*/private void initBreakPad() {if (externalReportPath == null) {externalReportPath = new File(getFilesDir(), "crashDump");if (!externalReportPath.exists()) {externalReportPath.mkdirs();}}BreakpadInit.initBreakpad(externalReportPath.getAbsolutePath());}@Overridepublic void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);initExternalReportPath();}private void initExternalReportPath() {externalReportPath = new File(Environment.getExternalStorageDirectory(), "crashDump");if (!externalReportPath.exists()) {externalReportPath.mkdirs();}}
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分析

1.将sdcard中保存下来的crashDump的文件保存到本地：

$:> adb pull /sdcard/crashDump  /Users/***/Desktop
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1. 首先把dump文件转化成text文件，采用的工具是Breakpad中的minidump工具。

./tools/mac/minidump_stackwalk crashDump/***.dmp >crashLog.txt
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1. 打开text文件看到详细的crash日志，如下

   Operating system: Android0.0.0 Linux 3.4.0-g7717f76 #1 SMP PREEMPT Wed Nov 4 21:42:24 UTC 2015 armv7l
   CPU: armARMv7 Qualcomm Krait features: swp,half,thumb,fastmult,vfpv2,edsp,neon,vfpv3,tls,vfpv4,idiva,idivt4 CPUsGPU: UNKNOWN
   Crash reason:  SIGSEGV /SEGV_MAPERR
   Crash address: 0x0
   Process uptime: not availableThread 0 (crashed)//crash 发生时候的线程0  libcrash-lib.so + 0x76e//发生 crash 的位置和寄存器信息r0 = 0x00000000    r1 = 0x00000001    r2 = 0xbea9b1fc    r3 = 0xb4d96a80r4 = 0x6f94d378    r5 = 0x12c0ec00    r6 = 0x12dca6a0    r7 = 0xbea9b1e8r8 = 0x12d63680    r9 = 0xb4db6500   r10 = 0x12d0bf20   r12 = 0xb3b1afd8fp = 0x00000000    sp = 0xbea9b1d4    lr = 0xb3b1778b    pc = 0xb3b1776eFound by: given as instruction pointer in context1  dalvik-main space (deleted) + 0x1cf0desp = 0xbea9b1ec    pc = 0x12dcf0e0Found by: stack scanning2  base.odex + 0x441137sp = 0xbea9b1f0    pc = 0xa2159139Found by: stack scanning3  dalvik-LinearAlloc (deleted) + 0x8baesp = 0xbea9b1f4    pc = 0xb0732bb0Found by: stack scanning4  dalvik-main space (deleted) + 0x5397esp = 0xbea9b200    pc = 0x12c53980Found by: stack scanning5  dalvik-main space (deleted) + 0xebfesp = 0xbea9b248    pc = 0x12c0ec00Found by: stack scanning6  dalvik-main space (deleted) + 0x1ca69esp = 0xbea9b24c    pc = 0x12dca6a0Found by: stack scanning7  dalvik-main space (deleted) + 0x1cf0desp = 0xbea9b250    pc = 0x12dcf0e0Found by: stack scanning8  dalvik-main space (deleted) + 0x16367esp = 0xbea9b254    pc = 0x12d63680Found by: stack scanning9  dalvik-main space (deleted) + 0x10bf1esp = 0xbea9b258    pc = 0x12d0bf20Found by: stack scanning
   10  base.odex + 0x440cb5sp = 0xbea9b260    pc = 0xa2158cb7Found by: stack scanning
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2. 符号解析，可以使用 ndk 中提供的addr2line来根据地址进行一个符号反解的过程,该工具在$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-addr2line

注意：此处要注意一下平台，如果是 arm64位的 so，解析是需要使用 aarch64-linux-android-4.9下的工具链

xiuchengdeMBP:crashDump xiuchengyin$ /Users/xiuchengyin/Library/Android/sdk/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-addr2line -f -C -e libcrash-lib.so 0x76e
Crash()
/Users/xiuchengyin/Documents/AndroidJK/Chapter01/sample/src/main/cpp/crash.cpp:10
xiuchengdeMBP:crashDump xiuchengyin$
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这样就可以看到 具体奔溃的代码行数了。

我只是做个笔记，文章参考：time.geekbang.org/column/arti…