Android 调试打印对应的调用堆栈

在平时的开发调试的时候，经常碰到需要打印JAVA、Native C++、kernel的代码调用关系。这里做一下记录

Jave堆栈打印

使用android.util.Log类进行打印

 /**
     * Send a {@link #DEBUG} log message and log the exception.
     * @param tag Used to identify the source of a log message.  It usually identifies
     *        the class or activity where the log call occurs.
     * @param msg The message you would like logged.
     * @param tr An exception to log
     */
    public static int d(@Nullable String tag, @Nullable String msg, @Nullable Throwable tr) {
        return printlns(LOG_ID_MAIN, DEBUG, tag, msg, tr);
    }


eg:
android.util.Log.d("test","xxx",new Exception());

kernel 堆栈打印

内核中打印堆栈比较简单，使用下面的函数即可

dump_stack();

Native 堆栈打印

借助libutilscallstack库进行打印。源码路径system\core\libutils\CallStack.cpp

//system\core\libutils\Android.bp
cc_library {
    name: "libutilscallstack",
    defaults: ["libutils_defaults"],
    // TODO(b/153609531): remove when no longer needed.
    native_bridge_supported: true,

    srcs: [
        "CallStack.cpp",
    ],

//system\core\libutils\CallStack.cpp
CallStack::CallStack(const char* logtag, int32_t ignoreDepth) {
    this->update(ignoreDepth+1);
    this->log(logtag);
}

可以看出CallStack.cpp编译成libutilscallstack库。使用之前，一定要先将这个库包含进来

（1）包含libutilscallstack库

shared_libs:[
        "libutilscallstack",
]

（2）包含头文件

#include<utils/CallStack.h>

（3）使用

CallStack stack("xxx");

注意，低版本的Andorid，CallStack.cpp是编译成libutils

cc_library {
    name: "libutils",
    vendor_available: true,
    vndk: {
        enabled: true,
        support_system_process: true,
    },
    host_supported: true,

    srcs: [
        "CallStack.cpp",

	//......

参考链接：Android 打印native堆栈