Setting a command breakpoint on a managed method in windbg

This is a combination of the Tess’s entry http://blogs.msdn.com/tess/archive/2008/04/28/setting-breakpoints-in-net-code-using-bpmd.aspx and Kristoffer’s http://blogs.msdn.com/kristoffer/archive/2007/01/02/setting-a-breakpoint-in-managed-code-using-windbg.aspx

The twist is in using directly !Name2EE and !DumpMT with setting a bp breakpoint with a command

First, getting the method table:

0:003> !Name2EE *!TestRWLocks.Program Module: 790c1000 (mscorlib.dll) -------------------------------------- Module: 00952354 (sortkey.nlp) -------------------------------------- Module: 00952010 (sorttbls.nlp) -------------------------------------- Module: 00932c5c (TestRWLocks.exe) Token: 0x02000002 MethodTable: 00933030 EEClass: 0093136c Name: TestRWLocks.Program -------------------------------------- Module: 7a441000 (System.dll) -------------------------------------- Module: 64891000 (System.Configuration.dll) -------------------------------------- Module: 637a1000 (System.Xml.dll)

Second, finding the entry address:

0:003> !DumpMT -MD 00933030 EEClass: 0093136c Module: 00932c5c Name: TestRWLocks.Program mdToken: 02000002  (C:\dev\spikes\TestRWLocks\TestRWLocks\bin\Debug\TestRWLocks.exe) BaseSize: 0xc ComponentSize: 0x0 Number of IFaces in IFaceMap: 0 Slots in VTable: 9 -------------------------------------- MethodDesc Table    Entry MethodDesc      JIT Name 79286aa0   79104924   PreJIT System.Object.ToString() 79286ac0   7910492c   PreJIT System.Object.Equals(System.Object) 79286b30   7910495c   PreJIT System.Object.GetHashCode() 792f7410   79104980   PreJIT System.Object.Finalize() 0093c021   00933028     NONE TestRWLocks.Program..ctor() 00c70070   00932ff8      JIT TestRWLocks.Program.Main(System.String[]) 00c70160   00933004      JIT TestRWLocks.Program.RunForever() 00c701c0   00933010      JIT TestRWLocks.Program.DummyMethod(Int32) 0093c01d   0093301c     NONE TestRWLocks.Program.LockOnReaderWriterLock()

Finally, setting a breakpoint with a command:

bp 00c701c0 ".echo --> Calling DummyMethod;!clrstack -p;g"

Lets check if breakpoint is really set:

0:003> bl 0 e 00c701c0     0001 (0001)  0:****  ".echo --> Calling DummyMethod;!clrstack -p;g"