Android中添加CallStack

（1）Java中添加

Java中添加callstack常见以下几种方式。

import android.util.Log; //（1） Exception e = new Exception("this is a log"); e.printStackTrace(); //（2） Thread.currentThread().getStackTrace(); //（3） Log.e("dump_test" , Log.getStackTraceString(new Throwable())); 

（2）C++中添加

（A）Mtk Camera Hal中有自定义的stack

//vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/std //Misc.h namespace NSCam { 
    namespace Utils { 
    void dumpCallStack(char const* prefix = 0); bool saveBufToFile(char const*const fname, unsigned char*const buf, unsigned int const size); unsigned int loadFileToBuf(char const*const fname, unsigned char*const buf, unsigned int const capacity); } } //vendor/mediatek/proprietary/hardware/mtkcam/utils/std //Misc.cpp //可使用如下方式进行使用 NSCam::Utils::dumpCallStack(__FUNCTION__); NSCam::Utils::saveBufToFile(filename, (unsigned char*)jpg.mOutputJpegBuffer->getBufVA(0), jpg.mOutputJpegBuffer->getBufSizeInBytes(0)); //使用示例 #include  
     using namespace NSCam; using namespace android; using namespace std; NSCam::Utils::dumpCallStack(__FUNCTION__); 

打印示例

11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: pid(748) tid(6053) Cam@Jpeg 11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: #00 pc 0000000000003040 /vendor/lib64/libladder.so (UnwindCurThreadBT+120) 11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: #01 pc 000000000000e4c4 /vendor/lib64/libmtkcam_stdutils.so (NSCam::Utils::dumpCallStack(char const*)+52) 11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: #02 pc 00000000001702ec /vendor/lib64/libmtkcam_hwnode.so (JpegNodeImp::encodeMainJpeg(android::sp<encode_frame>&)+44) 11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: #03 pc 000000000016ceb4 /vendor/lib64/libmtkcam_hwnode.so (onProcessRequest(JpegNodeImp&, Request&)+788) 11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: #04 pc 000000000017f064 /vendor/lib64/libmtkcam_hwnode.so (void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(JpegNodeImp&, Request&), std::__1::reference_wrapper<JpegNodeImp>, std::__1::reference_wrapper<Request> > >(void*)+44) 11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: #05 pc 00000000000b0bd8 /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) 11-15 15:37:23.082 748 6053 I MtkCam/Utils/encodeMainJpeg: #06 pc 00000000000505d0 /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) 

（B）C++中通用添加

（a）在Android.bp / Android.mk 中添加 libutilscallstack

//Android.bp shared_libs: [ "libutilscallstack", ] //Android.mk LOCAL_SHARED_LIBRARIES:= libutilscallstack //或 LOCAL_JNI_SHARED_LIBRARIES := libutilscallstack 

（b）在C++源码文件预编译 include 中添加

#include  
     

（c）添加代码实现

#include  
      using android::CallStack; CallStack stack; stack.update(); stack.log(__FUNCTION__); 

（d）系统库的源码位置

//system/core/libutils/include/utils/CallStack.h class CallStack { 
    public: CallStack(); ~CallStack(); void clear() { 
    mFrameLines.clear(); } void update(int32_t ignoreDepth = 1, pid_t tid = BACKTRACE_CURRENT_THREAD); void log(const char* logtag, android_LogPriority priority = ANDROID_LOG_DEBUG, const char* prefix = nullptr) const; void dump(int fd, int indent = 0, const char* prefix = nullptr) const; String8 toString(const char* prefix = nullptr) const; void print(Printer& printer) const; } //system/core/libutils/CallStack.cpp 

（e）打印示例

11-15 15:37:23.394 748 6053 D encodeMainJpeg: #00 pc 00000000001703d4 /vendor/lib64/libmtkcam_hwnode.so (JpegNodeImp::encodeMainJpeg(android::sp<encode_frame>&)+276) 11-15 15:37:23.394 748 6053 D encodeMainJpeg: #01 pc 000000000016ceb4 /vendor/lib64/libmtkcam_hwnode.so (onProcessRequest(JpegNodeImp&, Request&)+788) 11-15 15:37:23.394 748 6053 D encodeMainJpeg: #02 pc 000000000017f064 /vendor/lib64/libmtkcam_hwnode.so (void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(JpegNodeImp&, Request&), std::__1::reference_wrapper<JpegNodeImp>, std::__1::reference_wrapper<Request> > >(void*)+44) 11-15 15:37:23.394 748 6053 D encodeMainJpeg: #03 pc 00000000000b0bd8 /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+64) 11-15 15:37:23.394 748 6053 D encodeMainJpeg: #04 pc 00000000000505d0 /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) 

（3）Kernel中添加

Kernel中较简单，直接有现成的函数可以使用

dump_stack() //这个函数打出当前堆栈和函数调用backtrace后接着运行 WARN_ON(x) //这个函数跟dump_stack很像，如果条件满足了就把stack打出来 //WARN_ON(1);