Windbg在Managed App中设置函数断点的几种方法

本文介绍两种使用WindbgManaged App中设置断点的方法。一种是在live Debug的时候,attach到了Process之后。另外一种是动态调试的时候,如何给几个模块的特定方法下一个断点。    

         使用WindbgNative Code里面下断点是比较方便的,bp加上一个内存地址就可以做到。但是在托管的时候给一个方法下一个断点稍微有点麻烦。因为Windbg是一个native Debugger,而Managed App在没有Jited的时候,是没有生成Native Code的。每个方法在第一次调用之后,才生成了native code。当然,这里不说ngen

        

         还是先给个小程序做小白鼠:

         class Program

    {

        static void Main(string[] args)

        {

            System.Console.WriteLine("Show Params in Windbg");

            Program p = new Program();

 

            p.ShowParams(123456, "TestParams", 'L');

 

            System.Console.ReadLine();

        }

        public void ShowParams(int a, string b ,char c)

        {

        }

}

         

          在使用live Debug的时候,设置一个没有本地代码的方法断点不是很麻烦,首先:

 

          0:000> !name2ee *!FounctionParams.Program

Module: 790c2000 (mscorlib.dll)

--------------------------------------

Module: 00a82c3c (FounctionParams.exe)

Token: 0x02000002

MethodTable: 00a83038

EEClass: 00a811d8

Name: FounctionParams.Program

 

得到了MethodTable的地址了,然后:

         
0:000> !dumpmt -md 00a83038

EEClass: 00a811d8

Module: 00a82c3c

Name: FounctionParams.Program

mdToken: 02000002  (E:\myProject\FounctionParams\FounctionParams\bin\Debug\FounctionParams.exe)

BaseSize: 0xc

ComponentSize: 0x0

Number of IFaces in IFaceMap: 0

Slots in VTable: 7

--------------------------------------

MethodDesc Table

   Entry MethodDesc      JIT Name

79371278   7914b928   PreJIT System.Object.ToString()

7936b3b0   7914b930   PreJIT System.Object.Equals(System.Object)

7936b3d0   7914b948   PreJIT System.Object.GetHashCode()

793624d0   7914b950   PreJIT System.Object.Finalize()

00db0070   00a83020      JIT FounctionParams.Program.Main(System.String[])

00db0110   00a83028      JIT FounctionParams.Program.ShowParams

(Int32, System.String, Char)

00db00e0   00a83030      JIT FounctionParams.Program..ctor()

 

这里,得到了这个方法的MethodDesc的地址之后,继续:

0:000> !dumpmd 00a83028     

Method Name: FounctionParams.Program.ShowParams(Int32, System.String, Char)

Class: 00a811d8

MethodTable: 00a83038

mdToken: 06000002

Module: 00a82c3c

IsJitted: yes

m_CodeOrIL: 00db0110

 

可以看到,已经JIT过了,生成了本地的代码。列个时候,就有很多选择了,顺便看看native code

0:000> !u 00db0110

Normal JIT generated code

FounctionParams.Program.ShowParams(Int32, System.String, Char)

Begin 00db0110, size 20

>>> 00db0110 83ec08          sub     esp,8

00db0113 890c24          mov     dword ptr [esp],ecx

00db0116 89542404        mov     dword ptr [esp+4],edx

00db011a 833d082ea80000  cmp     dword ptr ds:[0A82E08h],0

00db0121 7405            je      00db0128

00db0123 e81f823779      call    mscorwks!JIT_DbgIsJustMyCode (7a128347)

00db0128 90              nop

00db0129 90              nop

00db012a 83c408          add     esp,8

00db012d c20800          ret     8

 

感觉和方法本身的代码不是很像,不过也就是他了,这个时候下断点可以有很多选择:

在地址上面下断点:

0:000> bp 00db0110

BPMD命令在这个方法的MethodDesc上面下断点:

0:000> !bpmd -md 00a83028     

MethodDesc = 00a83028

Setting breakpoint: bp 00DB0110 [FounctionParams.Program.ShowParams(Int32, System.String, Char)]

 

That will work

 

如果是动态调试下面,该如何做呢?这个比较麻烦点:

使用WindbgOpen Executable File菜单,打开上面编写的测试的引用程序:

0:000> sxe ld:mscorjit

0:000> g

ModLoad: 79060000 790b6000   C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorjit.dll

eax=00000000 ebx=00000000 ecx=00d90000 edx=7c90eb94 esi=00000000 edi=00000000

eip=7c90eb94 esp=0012e554 ebp=0012e648 iopl=0 nv up ei ng nz ac pe nc

cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 efl=00000296

ntdll!KiFastSystemCallRet:

7c90eb94 c3              ret

 

接着查看线程:

 

0:000> !threads

ThreadCount: 2

UnstartedThread: 0

BackgroundThread: 1

PendingThread: 0

DeadThread: 0

Hosted Runtime: no

 

Hosted Runtime: no

                                      PreEmptive   GC Alloc          

       ID       Context       Domain   Count APT Exception

   0    1   013f16d0:013f1fe8 0015c410     2 MTA

   2    2   00000000:00000000 0015c410     0 MTA (Finalizer)

 

接着就查看这个domain:

 

0:000> !dumpdomain 0015c410    

--------------------------------------

Domain 1: 0015c410

LowFrequencyHeap: 0015c434

HighFrequencyHeap: 0015c48c

StubHeap: 0015c4e4

Stage: OPEN

SecurityDescriptor: 0015d740

Name: FounctionParams.exe

Assembly: 0019f408

[C:\WINDOWS\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll]

ClassLoader: 0019f4a0

SecurityDescriptor: 0019be58

  Module Name

790c2000

C:\WINDOWS\assembly\GAC_32\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll

 

Assembly: 001a6b90

[E:\myProject\FounctionParams\FounctionParams\bin\Debug\FounctionParams.exe]

ClassLoader: 001a7270

SecurityDescriptor: 001a6a58

  Module Name

00a82c3c

E:\myProject\FounctionParams\FounctionParams\bin\Debug\FounctionParams.exe

 

然后查看module的信息:

 

0:000> !dumpmodule -mt 00a82c3c

Name: E:\myProject\FounctionParams\FounctionParams\bin\Debug\FounctionParams.exe

Attributes: PEFile

Assembly: 001a6b90

LoaderHeap: 00000000

TypeDefToMethodTableMap: 00a80038

TypeRefToMethodTableMap: 00a80040

MethodDefToDescMap: 00a8008c

FieldDefToDescMap: 00a8009c

MemberRefToDescMap: 00a800a0

FileReferencesMap: 00a800ec

AssemblyReferencesMap: 00a800f0

MetaData start address: 00402094 (1580 bytes)

 

Types defined in this module

 

      MT    TypeDef Name

------------------------------------------------------------------------------

00a83038 0x02000002 FounctionParams.Program

 

Types referenced in this module

 

      MT    TypeRef Name

------------------------------------------------------------------------------

790fd0f0 0x01000001 System.Object

 

,找到MT的地址了:

 

0:000> !dumpmt -md 00a83038

EEClass: 00a811d8

Module: 00a82c3c

Name: FounctionParams.Program

mdToken: 02000002  (E:\myProject\FounctionParams\FounctionParams\bin\Debug\FounctionParams.exe)

BaseSize: 0xc

ComponentSize: 0x0

Number of IFaces in IFaceMap: 0

Slots in VTable: 7

--------------------------------------

MethodDesc Table

   Entry MethodDesc      JIT Name

79371278   7914b928   PreJIT System.Object.ToString()

7936b3b0   7914b930   PreJIT System.Object.Equals(System.Object)

7936b3d0   7914b948   PreJIT System.Object.GetHashCode()

793624d0   7914b950   PreJIT System.Object.Finalize()

00a8c011   00a83020     NONE FounctionParams.Program.Main(System.String[])

00a8c015   00a83028     NONE FounctionParams.Program.ShowParams

(Int32, System.String, Char)

00a8c019   00a83030     NONE FounctionParams.Program..ctor()

 

,这个时候还没有被JIT,正好可以在这个地方下一个断点,当执行到这个方法的时候就触发断点:

0:000> !bpmd -md 00a83028    

MethodDesc = 00a83028    

Adding pending breakpoints...

 

恩,到这个地方,就给这个managed的方法,而且是没jited的给加上了一个断点。恩,两种不同的情况下下断点的方法。

 

Friday, October 17, 2008 6:35:12 PM

First Post at http://SSCLI.cnblogs.com

posted on 2008-10-17 19:05 lbq1221119 阅读(...) 评论(...) 编辑 收藏

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