Object Inspection in .NET

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Object Inspection
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public void PrintArrays() { foreach (int i in intArray) { ConsoleWriteLine("Int: {0}", i); } foreach (string s in strArray) { ConsoleWriteLine("Str: {0}", s); } } public void ThrowException(ObjTypes obj) { if (obj == null) { throw new SystemArgumentException("Obj cannot be null"); } } } public class Comparer<T> where T: IComparable { public T GreaterThan(T d, T d2) { int ret = dCompareTo(d2); if (ret > 0) return d; else return d2; } public T LessThan(T d, T d2) { int ret = dCompareTo(d2); if (ret < 0) return d; else return d2; } } }
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3 BASIC DEBUGGING TASKS
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Basic Debugging Tasks
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The source code and binary for Listing 3-10 can be found in the following folders:
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Source code: C:\ADND\3\ObjTypes Binary: C:\ADNDBin\03ObjTypesexe
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Dumping Raw Memory
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There are a number of commands available to dump out raw memory in the debuggers The most commonly used command is the d (display memory) command In its simplest form, the d command takes a parameter that indicates the address of the memory you would like to display The output of the d command is a neatly formatted display of the memory in question, as shown in the following:
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0:000> dd 01e06bec 01e06bfc 01e06c0c 01e06c1c 01e06c2c 01e06c3c 01e06c4c 01e06c5c 0x01e06bec 001c30b0 00000000 80000000 790fd8c4 003a0078 0030007b 007b003a 007d0031 0032007b 0000007d 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000014 002c007d 0020002c 00000000 00000000 00000000 00000000 00000000 00000013 00790020 003a007a 00000000 00000000 00000000 00000000
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The leftmost column shows the beginning address of the memory displayed on that line followed by the memory contents itself There are a number of different variations of the d command depending on the data type that you want to dump For example, du treats the memory being dumped as Unicode characters:
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0:000> du 7ffdfc00 7ffdfc00 "ADVAPI32dll"
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Other variations include the following:
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da: dw: db: dq:
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Treats memory being dumped as ASCII characters Treats memory being dumped as word values Treats memory being dumped as byte values and ASCII characters Treats memory being dumped as quad word values
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Although it s sometimes useful to dump raw memory, when dealing with managed code debugging, it is far more useful to dump the CLR objects in a more structured
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Object Inspection
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and easy-to-digest form For example, if we use the d command to dump out the following raw memory, we get the following:
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0:000> dd 01c56bec 01c56bfc 01c56c0c 01c56c1c 01c56c2c 01c56c3c 01c56c4c 01c56c5c 0x01c56bec 002130b0 00000000 80000000 790fd8c4 003a0078 0030007b 007b003a 007d0031 0032007b 0000007d 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000014 002c007d 0020002c 00000000 00000000 00000000 00000000 00000000 00000013 00790020 003a007a 00000000 00000000 00000000 00000000
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It s quite difficult to infer what the underlying memory actually represents Now consider the following more informative memory dump of the same address:
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0:000> !dumpobj 0x01c56bec Name: AdvancedNETDebugging3ObjTypes MethodTable: 002130b0 EEClass: 00211240 Size: 20(0x14) bytes (C:\ADNDBin\03ObjTypesexe) Fields: MT Field Offset Type VT Attr Value Name 0021306c 4000001 4 jTypes+Coordinate 1 instance 01c56bf0 coordinate
This time, the output is far more informative as it tells us that the address represents a CLR type instance corresponding to the type AdvancedNET Debugging3ObjTypes In addition, it gives us some basic information on the type instance as well as the fields contained within the instance Throughout the book, we will use a combination of the raw memory dump techniques as well as the friendlier dump commands Before we delve into the dump commands available for NET types, we must first discuss the different types available in the CLR type system The two basic forms of types available are value types and reference types A value type is a type that derives from SystemValueType and is typically allocated on the stack If a value type is part of a reference type (for example, a class), the value type will be allocated on the managed heap as part of the aggregating type In C#, an example of a value type is a struct type Reference types, on the other hand, are any types that are derived (directly or indirectly) from SystemObject but not from SystemValueType and are always allocated on the managed heap Why was the choice made to have two different forms of types The answer lies in performance Allocating small objects on the