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In this example, DumpObj reports the size of the object to be 28 (0x1c) bytes This is useful information when you want to find out the exact size of a single object Often, the object itself references other objects, which may reference other objects,
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and so forth Knowing the total size of an object (including traversing the sizes of type fields) can at times shed some light on objects that may be exceptionally large and troublesome Using the same reference as previously, we can use the ObjSize command to dump out the total size of the object as shown in the following:
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0:000> !ObjSize 01de1198 sizeof(01de1198) =
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9624 (
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0x2598) bytes (SystemSharedStatics)
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The total size reported is 9624 bytes, which is substantially larger than the originally reported size of 28 bytes If you run the ObjSize command without specifying an address, the command will list the size for all objects on all managed threads in the process
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The idea behind an exception model has been around for some time, and one of the ways in which Windows implements its version of the exception model is known as Structured Exception Handling (SEH) Similarly, the NET exception model builds on top of the Windows SEH to provide a richer object-based exception model enabling far more detailed exception information to be propagated The additional information that the CLR carries with each exception is stored on the managed heap As a matter of fact, an exception in the eyes of the CLR is a first class reference type, and we can utilize any of the techniques discussed earlier to dump out the details of an exception All CLR exceptions are surfaced as SEH exceptions with an error code of 0xe0434f4d, which means that any time an exception is thrown the debugger will report the exception as in the following:
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(a98cd0): CLR exception - code e0434f4d (first chance) (a98cd0): CLR exception - code e0434f4d (!!! second chance !!!)
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After the exception is reported in the debugger (assuming it is not handled), the execution stops, enabling you to investigate the source of the exception Because all exceptions are reported with an error code of 0xe0434f4d, how can we distinguish different NET exceptions The answer lies in figuring out where the extended exception information is stored The following listing illustrates a typical (abbreviated) native stack trace when a NET exception is thrown:
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ChildEBP RetAddr Args to Child 0013f304 79f55b05 e0434f4d 00000001 00000001 KERNEL32!RaiseException+0x53 0013f364 7a0904d5 01283cac 00000000 00000000 mscorwks! RaiseTheExceptionInternalOnly+0x226 0013f428 00cb0472 01282e54 01283cac 01282e54 mscorwks!JIT_Throw+0xfc WARNING: Frame IP not in any known module Following frames may be wrong
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0013f480 79e7be1b 0013f4cc 00000000 0013f510 0013f490 79e7bd9b 0013f560 00000000 0013f530 0013ff18 79edae8b 00400000 00000000 8ba1dfa4 SystemDomain::ExecuteMainMethod+0x398 0013ff68 79edadf3 00400000 8ba1df7c 7c911440 0013ffb0 79004044 0007f4cc 79e70000 0013fff0 0013ffc0 7c817067 7c911440 0007f4cc 7ffdf000 0013fff0 00000000 79004010 00000000 78746341
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0xcb0472 mscorwks!CallDescrWorker+0x33
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mscorwks! mscorwks!ExecuteEXE+0x59 mscorwks!_CorExeMain+0x11b mscoree!_CorExeMain+0x2c KERNEL32!BaseProcessStart+0x23
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At the top of the stack are a couple of frames that are responsible for surfacing the exception The frame of most interest is RaiseTheExceptionInternalOnly in the mscorwks module More specifically, the first argument (0x01283cac) to that function is the address of the managed exception We can utilize the DumpObj command to display all the properties of the managed exception Let s try it by running 03ObjTypesexe under the debugger and continue execution until a CLR exception is thrown (remember that all CLR exceptions are surfaced with an exception code of 0xe0434f4d) When execution has stopped, use the kb command to display the call stack:
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0:000> kb ChildEBP RetAddr Args to Child 0013f304 79f55b05 e0434f4d 00000001 00000001 KERNEL32!RaiseException+0x53 0013f364 7a0904d5 01283cac 00000000 00000000 mscorwks! RaiseTheExceptionInternalOnly+0x226 0013f428 00cb0483 01282e54 01283cac 01282e54 mscorwks!JIT_Throw+0xfc WARNING: Frame IP not in any known module Following frames may be wrong 0013f480 79e7be1b 0013f4cc 00000000 0013f510 0xcb0483 0013f490 79e7bd9b 0013f560 00000000 0013f530 mscorwks!CallDescrWorker+0x33 0013f510 79e7bce8 0013f560 00000000 0013f530 mscorwks! CallDescrWorkerWithHandler+0xa3 0013f650 79e7bbd0 00913178 0013f72c 0013f6e0 mscorwks!MethodDesc::CallDescr+0x19c 0013f668 79e802f4 00913178 0013f72c 0013f6e0 mscorwks! MethodDesc::CallTargetWorker+0x20 0013f67c 79edb56e 0013f6e0 47284667 00000000 mscorwks!MethodDescCallSite::CallWithValueTypes_RetArgSlot+0x18 0013f7e0 79edb367 00913030 00000001 0013f81c mscorwks!ClassLoader::RunMain+0x220 0013fa48 79edb23c 00000000 47284bb7 00000000 mscorwks!Assembly::ExecuteMainMethod+0xa6 0013ff18 79edae8b 00400000 00000000 47284e2b mscorwks!SystemDomain::ExecuteMainMethod+0x398 0013ff68 79edadf3 00400000 47284ef3 7c911440 mscorwks!ExecuteEXE+0x59 0013ffb0 79004044 0007f4cc 79e70000 0013fff0 mscorwks!_CorExeMain+0x11b 0013ffc0 7c817067 7c911440 0007f4cc 7ffde000 mscoree!_CorExeMain+0x2c 0013fff0 00000000 79004010 00000000 78746341 KERNEL32!BaseProcessStart+0x23
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