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derived from the Object class The Object class defines four methods that are inherited by all subclasses, namely ToString, Equals, GetHashCode, and Finalize The four inherited methods, the implicit constructor, and our own two methods add up to a total of seven The next field of interest is the field (of size WORD) indicating the number of virtual methods in the class In our particular example, the field has a value of 0x0004, which means that our class has four virtual methods defined Once again, we look back at the parent Object, which has four virtual methods defined on it (as discussed earlier) The field that states the number of interfaces our class implements is next, which in our case is 0x0000 since we do not implement any interfaces The final field of interest is the parent method table field, which contains a pointer to the parent object s method table The pointer in our case is 0x790fd0f0 Using the same strategy we are employing on our own types method table, you can now dump out the contents of the parent method table and interrogate the contents of that type The next part of the method table is a pointer to the module information that the type is associated with From our dump in Listing 2-8, we can see that the pointer value is 0x00292c3c To get extended information on a module, we can use the DumpModule extension command and pass in the pointer value:
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0:000> !DumpModule 00292c3c Name: C:\ADNDBin\02TypeSampleexe Attributes: PEFile Assembly: 0044d8b0 LoaderHeap: 00000000 TypeDefToMethodTableMap: 002900c0 TypeRefToMethodTableMap: 002900cc MethodDefToDescMap: 002900fc FieldDefToDescMap: 0029010c MemberRefToDescMap: 00290120 FileReferencesMap: 00290148 AssemblyReferencesMap: 0029014c MetaData start address: 00c8214c (1168 bytes)
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We will take a closer look at Module information later in this chapter The next field of interest is the pointer to what is known as an EEClass We will cover the EEClass data structure later in the chapter The next couple of DWORD fields are not used during debugging of NET applications and can be safely ignored This constitutes the essence of the method table The remaining fields contain the virtual method table for the type Each DWORD field constitutes a pointer to the method itself In our case, the number of methods fields indicated that we have a total of seven methods The pointers in the virtual method table are highlighted here:
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002930d0 002930e0 002930f0
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00000000 00000000 79371278 7936b3b0 7936b3d0 793624d0 003400c8 0029c015 00340070 00000000 00000080 00000000
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We can use U (unassemble), the extension command, to unassemble each of the method pointers above For example, if we unassembled the method pointer at address 0x003400c8, we would see the following:
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0:000> !u 003400c8 Normal JIT generated code AdvancedNETDebugging2TypeSamplector(Int32, Int32, Int32) Begin 003400c8, size 35 >>> 003400c8 57 push edi 003400c9 56 push esi 003400ca 8bf1 mov esi,ecx 003400cc 8bfa mov edi,edx 003400ce 833d082e290000 cmp dword ptr ds:[292E08h],0 003400d5 7405 je 003400dc 003400d7 e86b82de79 call mscorwks!JIT_DbgIsJustMyCode (7a128347) 003400dc 8bce mov ecx,esi 003400de e8d5230279 call mscorlib_ni+0x2a24b8 (793624b8) (SystemObjectctor(), mdToken: 06000001) 003400e3 90 nop 003400e4 90 nop 003400e5 897e04 mov dword ptr [esi+4],edi 003400e8 8b442410 mov eax,dword ptr [esp+10h] 003400ec 894608 mov dword ptr [esi+8],eax 003400ef 8b44240c mov eax,dword ptr [esp+0Ch] 003400f3 89460c mov dword ptr [esi+0Ch],eax 003400f6 90 nop 003400f7 90 nop 003400f8 5e pop esi 003400f9 5f pop edi 003400fa c20800 ret 8 0:000>
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The U command unassembled the code for us, as well as provided additional annotation For example, we can see that the code we just unassembled is the constructor for the TypeSample class Please note that some of the method pointers in the method table may point to unmanaged code For example, the method pointer 0x0029c015 points to an unmanaged code section:
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