代码之家  ›  专栏  ›  技术社区  ›  mersey

Xamarin Android本机调用堆栈

monodevelop xamarin.android xamarin c# java
  •  2
  • mersey  · 技术社区  · 7 年前

    我是新的Xamarin开发人员,我想为Xamarin开发准备诊断工具。在我的例子中,我希望从C#exception中获取托管堆栈跟踪,并从其余库中获取非托管堆栈跟踪(如果可能的话,请使用Java)。我尝试调用C++方法,用一些奇怪的选项初始化控件,调用java库(google maps),但我仍然没有本地调用堆栈的堆栈跟踪。

    您能帮我解释一下如何从Xamarin Android应用程序中获得托管和非托管堆栈帧的堆栈跟踪吗?

    非常感谢!

    1 回复  |  直到 7 年前
        1
  •  4
  •   SushiHangover    7 年前

    来自其余库(C++、java)的非托管堆栈跟踪

    就C而言,没有异常处理,C++确实有异常,但它们与CIL管理的异常完全不同。现在,您可以在NDK/C++代码中实现C++异常,如果可能的话,可以基于异常和继续运行的能力,抑制异常,并通过以某种方式表示C++异常的Mono运行时创建托管异常。有关运行时异常传播的更多信息,请参阅Mono文档。就我个人而言,我只是在C++级别处理C++异常,记录它们,报告它们,等等。。。并且不要尝试将异常传播回托管代码(开销太大,而工作回报太少)。

    在各种 Xamarin.Android /Android例外:

    Mono运行时/NDK崩溃

    考虑类似libc的字符串 strncpy : 

    [DllImport("libc.so")]
private static extern void strncpy(StringBuilder dest, string src, uint n);

    并用null(或IntPtr.Zero)调用它: 

    strncpy(null, null, 1);

    一个严重的运行时崩溃: 

    [mono-rt] Stacktrace:
[mono-rt] 
[mono-rt]   at <unknown> <0xffffffff>
[mono-rt]   at (wrapper managed-to-native) Android_Clipboard.MainActivity.strncpy (System.Text.StringBuilder,string,uint) <0x00012>
[mono-rt]   at Android_Clipboard.MainActivity/<>c__DisplayClass5_0.<OnCreate>b__0 (object,System.EventArgs) [0x0004f] in /Volumes/Code/code/Projects/Android_Clipboard/Android_Clipboard/MainActivity.cs:57
[mono-rt]   at Android.Views.View/IOnClickListenerImplementor.OnClick (Android.Views.View) [0x00011] in <25661073a35344a89f215a4cf81af37c>:0
[mono-rt]   at Android.Views.View/IOnClickListenerInvoker.n_OnClick_Landroid_view_View_ (intptr,intptr,intptr) [0x00011] in <25661073a35344a89f215a4cf81af37c>:0
[mono-rt]   at (wrapper dynamic-method) object.cea8479a-a63b-41ac-a9f6-b0fe3b09df49 (intptr,intptr,intptr) [0x00017] in <f32579baafc1404fa37ba3ec1abdc0bd>:0
[mono-rt]   at (wrapper native-to-managed) object.cea8479a-a63b-41ac-a9f6-b0fe3b09df49 (intptr,intptr,intptr) [0x00022] in <f32579baafc1404fa37ba3ec1abdc0bd>:0
[mono-rt] /proc/self/maps:
[mono-rt] 12c00000-42c00000 rw-p 00000000 00:01 207683     /dev/ashmem/dalvik-main space (region space) (deleted)
[mono-rt] 70dca000-70f78000 rw-p 00000000 fc:00 106531     /data/dalvik-cache/x86/system@framework@boot.art
[mono-rt] 70f78000-71014000 rw-p 00000000 fc:00 106532     
~~~
[mono-rt] No native Android stacktrace (see debuggerd output).
[mono-rt] 
[mono-rt] 
[mono-rt] =================================================================
[mono-rt] Got a SIGSEGV while executing native code. This usually indicates
[mono-rt] a fatal error in the mono runtime or one of the native libraries 
[mono-rt] used by your application.
[mono-rt] =================================================================
[mono-rt] 
[libc] Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 14916 (droid_Clipboard), pid 14916 (droid_Clipboard)

    Mono/CIL管理的异常

    从CIL Mono VM到Java调用的任何内容都通过VM2VM桥(CilVM<->Mono/JNI<->JavaVM)由Mono JNIEnv处理,因此由Mono运行时包装在托管异常中。

    考虑思考一个不存在的Java字段(来自C#): 

    var someWidget = FindViewById<Button>(Resource.Id.myButton);
Java.Lang.Reflect.Field f = someWidget.Class.GetField("SomethingThatDoesNotExist");

    生成基于Java的Java。包装并显示为托管异常的lang.NoSuchFieldException: 

    MonoDroid] UNHANDLED EXCEPTION:
[MonoDroid] Java.Lang.NoSuchFieldException: SomethingThatDoesNotExist
[MonoDroid]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <f32579baafc1404fa37ba3ec1abdc0bd>:0 
[MonoDroid]   at Java.Interop.JniEnvironment+InstanceMethods.CallObjectMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <09bf3e262b934ffab2ba01f9fc7fd54d>:0 
[MonoDroid]   at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeAbstractObjectMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00014] in <09bf3e262b934ffab2ba01f9fc7fd54d>:0 
[MonoDroid]   at Java.Lang.Class.GetField (System.String name) [0x00029] in <25661073a35344a89f215a4cf81af37c>:0 
[MonoDroid]   at Android_Clipboard.MainActivity+<>c__DisplayClass5_0.<OnCreate>b__0 (System.Object <p0>, System.EventArgs <p1>) [0x00048] in /Volumes/Code/code/Projects/Android_Clipboard/Android_Clipboard/MainActivity.cs:53 
[MonoDroid]   at Android.Views.View+IOnClickListenerImplementor.OnClick (Android.Views.View v) [0x00011] in <25661073a35344a89f215a4cf81af37c>:0 
[MonoDroid]   at Android.Views.View+IOnClickListenerInvoker.n_OnClick_Landroid_view_View_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_v) [0x0000f] in <25661073a35344a89f215a4cf81af37c>:0 
[MonoDroid]   at (wrapper dynamic-method) System.Object.7ad62bce-4e52-4d67-9099-969546fceb57(intptr,intptr,intptr)
[MonoDroid]   --- End of managed Java.Lang.NoSuchFieldException stack trace ---
[MonoDroid] java.lang.NoSuchFieldException: SomethingThatDoesNotExist
[MonoDroid]     at java.lang.Class.getField(Class.java:1601)
[MonoDroid]     at mono.android.view.View_OnClickListenerImplementor.n_onClick(Native Method)
[MonoDroid]     at mono.android.view.View_OnClickListenerImplementor.onClick(View_OnClickListenerImplementor.java:30)
[MonoDroid]     at android.view.View.performClick(View.java:6294)
[MonoDroid]     at android.view.View$PerformClick.run(View.java:24770)
[MonoDroid]     at android.os.Handler.handleCallback(Handler.java:790)
[MonoDroid]     at android.os.Handler.dispatchMessage(Handler.java:99)
[MonoDroid]     at android.os.Looper.loop(Looper.java:164)
[MonoDroid]     at android.app.ActivityThread.main(ActivityThread.java:6494)
[MonoDroid]     at java.lang.reflect.Method.invoke(Native Method)
[MonoDroid]     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
[MonoDroid]     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
[MonoDroid]

    “本机”Java异常

    考虑一个Java异常,该异常不会在Mono/CIL调用的上下文中发生:

    Java: 

    private static void stackOverflowLoop() {
    CrashMe.stackOverflowLoop();
}
public void stackOverflow() {
    new Handler().postDelayed(new Runnable() {
        public void run() {
            CrashMe.stackOverflowLoop();
        }
    }, 2000);
}

    C#: 

    new CrashMe().StackOverflow();

    生成在Android运行时捕获的“纯”Java异常(请记住 沙马林。安卓 应用程序只是基于NDK的 C 具有CIL VM和Java VM访问权限的应用程序) 

    AndroidRuntime] Shutting down VM
[AndroidRuntime] FATAL EXCEPTION: main
[AndroidRuntime] Process: com.sushihangover.Android_Clipboard, PID: 23664
[AndroidRuntime] java.lang.StackOverflowError: stack size 8MB
[AndroidRuntime]    at com.sushihangover.mylibrary.CrashMe.stackOverflowLoop(CrashMe.java:7)
~~~~
[AndroidRuntime]    at com.sushihangover.mylibrary.CrashMe.stackOverflowLoop(CrashMe.java:7)
[AndroidRuntime]    at com.sushihangover.mylibrary.CrashMe.access$000(CrashMe.java:5)
[AndroidRuntime]    at com.sushihangover.mylibrary.CrashMe$1.run(CrashMe.java:12)
[AndroidRuntime]    at android.os.Handler.handleCallback(Handler.java:790)
[AndroidRuntime]    at android.os.Handler.dispatchMessage(Handler.java:99)
[AndroidRuntime]    at android.os.Looper.loop(Looper.java:164)
[AndroidRuntime]    at android.app.ActivityThread.main(ActivityThread.java:6494)
[AndroidRuntime]    at java.lang.reflect.Method.invoke(Native Method)
[AndroidRuntime]    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
[AndroidRuntime]    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

    基于Java的Android没有响应( ANR )

    仅被Android操作系统捕获/捕获。

    Java: 

    public void androidNotReponding() {
    new Handler().postDelayed(new Runnable() {
        public void run() {
            while (true) {
            }
        }
    }, 2000);

    C类# 

    new CrashMe().AndroidNotReponding();

    ANR日志目录: 

    [zygote] Thread[3,tid=25575,WaitingInMainSignalCatcherLoop,Thread*=0xb224ec00,peer=0x13880020,"Signal Catcher"]: reacting to signal 3
[zygote] 
[zygote] Wrote stack traces to '[tombstoned]'
E ActivityManager: ANR in com.sushihangover.Android_Clipboard (com.sushihangover.Android_Clipboard/md58bbdf49b937b7d185e88b8dfe7516c89.MainActivity)
E ActivityManager: PID: 25886
E ActivityManager: Reason: Input dispatching timed out (Waiting to send non-key event because the touched window has not finished processing certain input events that were delivered to it over 500.0ms ago.

    石头痕迹: 

    Cmd line: com.sushihangover.Android_Clipboard
~~~~
Total blocking GC count: 0
Total blocking GC time: 0
~~~~
suspend all histogram:  Sum: 576us 99% C.I. 2us-329.200us Avg: 30.315us Max: 346us
DALVIK THREADS (13):
"main" prio=5 tid=1 Runnable
  | group="main" sCount=0 dsCount=0 obj=0x73997258 self=0xb4034500
  | sysTid=4484 nice=0 cgrp=default sched=0/0 handle=0xb7728c00
  | state=R schedstat=( 0 0 0 ) utm=6486 stm=688 core=3 HZ=100
  | stack=0xbf21d000-0xbf21f000 stackSize=8MB
  | held mutexes= "mutator lock"(shared held)
  at com.sushihangover.mylibrary.CrashMe$3.run(CrashMe.java:26)
  at android.os.Handler.handleCallback(Handler.java:739)
  at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:148)
  at android.app.ActivityThread.main(ActivityThread.java:5417)
  at java.lang.reflect.Method.invoke!(Native method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

"Signal Catcher" daemon prio=5 tid=2 Runnable
  | group="system" sCount=0 dsCount=0 obj=0x12c840a0 self=0xae4c2000
  | sysTid=4488 nice=0 cgrp=default sched=0/0 handle=0xb3432930
  | state=R schedstat=( 0 0 0 ) utm=0 stm=0 core=0 HZ=100
  | stack=0xb3336000-0xb3338000 stackSize=1014KB
  | held mutexes= "mutator lock"(shared held)
  native: #00 pc 0058bd02  /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::ArtMethod*, void*)+226)
  native: #01 pc 0055194e  /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+286)
 ~~~~
    推荐文章
    user29759326  ·  如何返回递归函数中的最后一个值?
    9 月前
    malife89  ·  将java中的字符串读取为正确的日期格式
    9 月前
    Tim  ·  在java中,有没有更快的方法将字节数组写入文件?
    9 月前
    pebble unit  ·  如何检查以前缀开头、以后缀结尾的属性(不是属性值)
    9 月前
    Nuñito Calzada  ·  Spring Boot with JWT:访问此资源需要完全身份验证
    9 月前
    rudraraj  ·  java中未声明最终变量
    10 月前
    Bala Ji  ·  以下BFS的实施效率如何?
    10 月前
    MineRickStar  ·  如何在Java中从Windows获取当前选定的应用程序
    10 月前
    user2649681  ·  实时生成音频以写入“SourceDataLine”`
    10 月前
    davidalayachew  ·  为什么我的文件有竞争条件,即使我使用了StandardOpenOption。同步?
    10 月前
    关于   移动版
    代码之家 - 一站式码农服务社区
    沪ICP备11025650号