mirror of
https://github.com/feicong/rom-course.git
synced 2025-08-29 10:44:59 +00:00
12章完成
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dqzg12300
parent
feb3163e2a
commit
9f6d849cc3
@ -1434,7 +1434,14 @@ void signal_register(void) {
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sigaction(SIGABRT, &act, NULL);
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}
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static bool isInit=false;
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const char* kbacktrace(bool with_context,const char* moduleName) {
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if(!isInit){
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signal_register();
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isInit=true;
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}
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g_with_context = with_context;
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__atomic_store_n(&g_frames_sz, 0, __ATOMIC_SEQ_CST);
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@ -1473,7 +1480,6 @@ Java_com_mik_nativecppdemo_MainActivity_stringFromJNI(
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// 在动态库加载时调用，完成本地方法的注册
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JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *, void *) {
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signal_register();
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return JNI_VERSION_1_6;
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}
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@ -1619,35 +1625,201 @@ PRODUCT_PACKAGES += \
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libkbacktrace \
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```
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编译刷入手机后，即可在系统动态库目录中找到内置进去的动态库。接下来在应用的启动阶段，判断其是否为目标应用，是目标应用则按顺序加载动态库，所以下面回到在前面准备好的读取配置的测试代码。
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最后将这三个动态库添加到公共库的清单文件，修改文件`system/core/rootdir/etc/public.libraries.android.txt`，添加内容如下。
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```java
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public static void loadBlackTraceSo(){
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System.loadLibrary("xdl");
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System.loadLibrary("xunwind");
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System.loadLibrary("kbacktrace");
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}
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```
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libxdl.so
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libxunwind.so
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libkbacktrace.so
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```
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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...
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// 判断当前app是否为目标应用
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PackageItem currentItem=null;
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for(PackageItem item : packageItems){
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if(item.packageName.contains(this.getPackageName())){
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currentItem=item;
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break;
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}
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}
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if(currentItem==null){
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编译刷入手机后，即可在系统动态库目录中找到内置进去的动态库。那么应该如何使用内置的动态库来获取堆栈信息呢，在直接修改`JNI`调用时机前，先用一个简单的代码测试能否轻易的获取堆栈。
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新建`native c++`项目，修改`stringFromJNI`函数，添加打印调用栈信息的代码如下。
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```c++
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#include <jni.h>
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#include <string>
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#include <android/log.h>
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#include <dlfcn.h>
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#define TAG "mikrom"
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#define LOG_PRIORITY ANDROID_LOG_INFO
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#define ALOGI(fmt, ...) __android_log_print(LOG_PRIORITY, TAG, fmt, ##__VA_ARGS__)
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typedef const char* (*kbacktraceFunc)(bool with_context,const char* moduleName);
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void showBacktrace(const char* moduleName){
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kbacktraceFunc kbacktrace = (kbacktraceFunc)dlsym(RTLD_DEFAULT, "_Z10kbacktracebPKc");
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if(kbacktrace==NULL){
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const char* error = dlerror();
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ALOGI("not found method.%s",error);
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return;
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}
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if(currentItem.isJNIMethodPrint){
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loadBlackTraceSo();
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}
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...
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const char* res=kbacktrace(true,moduleName);
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ALOGI("%s\n",res);
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}
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extern "C" JNIEXPORT jstring JNICALL
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Java_com_example_backtracedemo_MainActivity_stringFromJNI(
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JNIEnv* env,
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jobject /* this */) {
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std::string hello = "Hello from C++";
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showBacktrace("");
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return env->NewStringUTF(hello.c_str());
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}
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```
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最后在`JNI`打桩函数的结尾获取调用栈信息，
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运行该项目后，成功输出调用栈信息，到这里已经能随时获取调用栈了。在初始化配置的时候获取到该函数指针，并存储起来。修改`initConfig`代码如下。
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```c++
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static void
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DexFile_initConfig(JNIEnv* env, jobject ,jobject item) {
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Runtime* runtime=Runtime::Current();
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jclass jcInfo = env->FindClass("java/krom/PackageItem");
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jfieldID jPackageName = env->GetFieldID(jcInfo, "packageName", "Ljava/lang/String;");
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jfieldID jJniModuleName = env->GetFieldID(jcInfo, "jniModuleName", "Ljava/lang/String;");
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jfieldID jJniFuncName = env->GetFieldID(jcInfo, "jniFuncName", "Ljava/lang/String;");
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jfieldID jIsRegisterNativePrint = env->GetFieldID(jcInfo, "isRegisterNativePrint", "Z");
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jfieldID jIsJNIMethodPrint = env->GetFieldID(jcInfo, "isJNIMethodPrint", "Z");
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PackageItem citem;
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jstring jstrPackageName = (jstring)env->GetObjectField(item, jPackageName);
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const char* pPackageName = (char*)env->GetStringUTFChars(jstrPackageName, 0);
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strcpy(citem.packageName, pPackageName);
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jstring jstrJniModuleName = (jstring)env->GetObjectField(item, jJniModuleName);
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const char* pJniModuleName = (char*)env->GetStringUTFChars(jstrJniModuleName, 0);
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strcpy(citem.jniModuleName, pJniModuleName);
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jstring jstrJniFuncName = (jstring)env->GetObjectField(item, jJniFuncName);
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const char* pJniFuncName = (char*)env->GetStringUTFChars(jstrJniFuncName, 0);
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strcpy(citem.jniFuncName, pJniFuncName);
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citem.isRegisterNativePrint = env->GetBooleanField(item, jIsRegisterNativePrint);
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citem.isJNIMethodPrint = env->GetBooleanField(item, jIsJNIMethodPrint);
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if(citem.isJNIMethodPrint){
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void* handle_xdl=NULL;
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void* handle_xunwind=NULL;
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void* handle_kbacktrace=NULL;
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#if defined(__aarch64__)
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// 当前 CPU 架构为 arm64
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handle_xdl= dlopen("/system/lib64/libxdl.so",RTLD_NOW);
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handle_xunwind= dlopen("/system/lib64/libxunwind.so",RTLD_NOW);
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handle_kbacktrace= dlopen("/system/lib64/libkbacktrace.so",RTLD_NOW);
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#else
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// 当前 CPU 架构为 armeabi-v7a 或更早版本
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handle_xdl= dlopen("/system/lib/libxdl.so",RTLD_NOW);
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handle_xunwind= dlopen("/system/lib/libxunwind.so",RTLD_NOW);
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handle_kbacktrace= dlopen("/system/lib/libkbacktrace.so",RTLD_NOW);
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#endif
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if(handle_kbacktrace!=nullptr){
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citem.kbacktrace= dlsym(handle_kbacktrace, "_Z10kbacktracebPKc");
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if(citem.kbacktrace==nullptr){
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ALOGD("mikrom kbacktrace is null.err:%s",dlerror());
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}else{
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ALOGD("mikrom kbacktrace:%p.",citem.kbacktrace);
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}
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}else{
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ALOGD("mikrom handle_kbacktrace is null.err:%s",dlerror());
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}
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}
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runtime->SetConfigItem(citem);
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}
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```
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然后就可以在`JNI`打桩函数时输出堆栈信息了，下面将代码进行简单封装和调用。
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```c++
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typedef const char* (*kbacktraceFunc)(bool,const char*);
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const char* getBacktrace(const char* moduleName){
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Runtime* runtime=Runtime::Current();
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if(runtime->GetConfigItem().kbacktrace== nullptr){
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ALOGD("mikrom kbacktrace is null");
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return nullptr;
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}
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kbacktraceFunc kbacktrace=(kbacktraceFunc)runtime->GetConfigItem().kbacktrace;
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return kbacktrace(true,moduleName);
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}
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void ShowVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,const char* funcname,jclass java_class, const char* name, const char* sig,jmethodID methodID){
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if(!HasShow()){
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return;
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}
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ObjPtr<mirror::Class> c = soa.Decode<mirror::Class>(java_class);
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std::string temp;
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const char* className= c->GetDescriptor(&temp);
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ArtMethod* method = jni::DecodeArtMethod(methodID);
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pid_t pid = getpid();
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ALOGD("%s /* TID %d */","mikrom",pid);
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ALOGD("%s [+] JNIEnv->%s","mikrom",funcname);
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ALOGD("%s |- jclass :%s","mikrom",className);
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ALOGD("%s |- char* :%p","mikrom",name);
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ALOGD("%s |: %s","mikrom",name);
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ALOGD("%s |- char* :%p","mikrom",sig);
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ALOGD("%s |: %s","mikrom",sig);
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ALOGD("%s |= jmethodID :0x%x {%s}","mikrom",method->GetMethodIndex(),method->PrettyMethod().c_str());
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Runtime* runtime=Runtime::Current();
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const char* backtrace= getBacktrace(runtime->GetConfigItem().jniModuleName);
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ALOGD("-------------------------mikrom Backtrace-------------------------\n%s\n",backtrace);
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}
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```
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到这里`JniTrace`的`AOSP`版本就完成了，其他的函数调用参考前面的做法即可，最后优化后的日志输入如下。
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```
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mikrom enter jni java.lang.String cn.mik.nativedemo.MainActivity.stringFromJNI() 0x7a0bc06010
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mikrom /* TID 5641 */
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mikrom [+] JNIEnv->GetMethodID
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mikrom |- jclass :Lcn/mik/nativedemo/MainActivity;
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mikrom |- char* :0x781eb6cf1b
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mikrom |: demo
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mikrom |- char* :0x781eb6ceef
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mikrom |: (IFLjava/lang/String;)Ljava/lang/String;
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mikrom |= jmethodID :0x277 {java.lang.String cn.mik.nativedemo.MainActivity.demo(int, float, java.lang.String)}
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-------------------------mikrom Backtrace-------------------------
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#05 pc 000000000000e9dc /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (_ZN7_JNIEnv11GetMethodIDEP7_jclassPKcS3_+60)
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#06 pc 000000000000e888 /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (Java_cn_mik_nativedemo_MainActivity_stringFromJNI+80)
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mikrom /* TID 5641 */
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mikrom [+] JNIEnv->NewStringUTF
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mikrom |- char* : newdemo
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-------------------------mikrom Backtrace-------------------------
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#05 pc 000000000000ea14 /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (_ZN7_JNIEnv12NewStringUTFEPKc+44)
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#06 pc 000000000000e89c /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (Java_cn_mik_nativedemo_MainActivity_stringFromJNI+100)
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mikrom /* TID 5641 */
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mikrom [+] JNIEnv->CallObjectMethodV
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mikrom |- jmethodID :0x277 {java.lang.String cn.mik.nativedemo.MainActivity.demo(int, float, java.lang.String)}
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mikrom |- va_list :0x7ffb41b790
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mikrom |: jint : 1
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mikrom |: jfloat : 2
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mikrom |: jstring : newdemo
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mikrom |= jstring :3.0newdemo
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-------------------------mikrom Backtrace-------------------------
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#06 pc 000000000000eae4 /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (_ZN7_JNIEnv16CallObjectMethodEP8_jobjectP10_jmethodIDz+196)
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#07 pc 000000000000e8bc /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (Java_cn_mik_nativedemo_MainActivity_stringFromJNI+132)
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mikrom /* TID 5641 */
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mikrom [+] JNIEnv->GetStringUTFChars
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mikrom |- jboolean* : 0
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mikrom |= char* : 3.0newdemo
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-------------------------mikrom Backtrace-------------------------
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#05 pc 000000000000eb54 /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (_ZN7_JNIEnv17GetStringUTFCharsEP8_jstringPh+52)
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#06 pc 000000000000e8d0 /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (Java_cn_mik_nativedemo_MainActivity_stringFromJNI+152)
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mikrom /* TID 5641 */
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mikrom [+] JNIEnv->NewStringUTF
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mikrom |- char* : 3.0newdemo
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-------------------------mikrom Backtrace-------------------------
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#05 pc 000000000000ea14 /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (_ZN7_JNIEnv12NewStringUTFEPKc+44)
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#06 pc 000000000000e910 /data/app/~~MjwExmAtQBa8X1Xp3ifz_g==/cn.mik.nativedemo-YbmCkQ7SdhNqbL7iXfOeug==/lib/arm64/libnativedemo.so (Java_cn_mik_nativedemo_MainActivity_stringFromJNI+216)
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mikrom leave jni java.lang.String cn.mik.nativedemo.MainActivity.stringFromJNI()
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```
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