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bgt Branch on greater than or equal ble Branch on less than or equal blt Branch on less than bne Branch on not equal In each general branching case, the instruction takes the two values at the top of the stack and compares the top value with the next value. In all cases, the branch takes the place of a comparison followed by one of the Boolean branches. For example, bgt is equivalent to a cgt instruction followed by a brtrue instruction. conv Data conversion This instruction converts the data on the top of the stack to a new type and leaves the converted value on the top of the stack. The final conversion type follows the conv instruction. For example, conv.u4 converts to an unsigned 4-byte integer. The conv instruction with just the type doesn't throw any exceptions if there is any sort of overflow. If the instruction has .ovf between the conv and the type (for example, conv.ovf.u8), an overflow generates an exception. ldloc.0 // Load local zero (an array). ldlen conv.i4 // Get the array length. // Convert the array length to a // four byte value. newarr Create a zero-based, one-dimensional array This instruction creates a new array of the specified type with the number of elements indicated by the value on the top of the stack. The number of elements count is removed from the stack, and the new array is placed on the top of the stack. ldc.i4.5 // Set the number of elements to // create to five. // Create a new array. newarr System.ComponentModel.MemberAttribute newobj Create a new object Creates a new object and calls the object's constructor. All constructor arguments are passed on the stack. If the creation succeeds, the arguments are removed from the stack and the object reference is left on the stack. .method public hidebysig specialname rtspecialname instance 'stream', { ldarg.1 // Load the stream argument. // Create the new class. newobj instance void [mscorlib] 234 void .ctor(class [mscorlib]System.IO.Stream
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class System.String name) il managed
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System.IO.StreamWriter::.ctor(class [mscorlib]System.IO.Stream) box Convert value type to object reference This instruction forces a value into an object and leaves the object on the stack when the conversion is done. When boxing, this instruction does the work. You will see the following code a lot when passing parameters: // Notice the value type INT32 is passed to this method. .method public hidebysig specialname instance void { ldstr ldarga.s the box "Indent" 'value' // Push the method name. // Load the argument address of // first parameter. [mscorlib]System.Int32 // Convert the address into an // object. // Load the message. ldstr "The Indent property must be non-negative." // Create a new ArgumentOutOfRangeException newobj instance [mscorlib]System.ArgumentOutOfRangeException:: .ctor(class System.String, class System.Object, class System.String) unbox Convert boxed value type to its raw form This instruction returns a managed reference to the value type in the boxed form. The returned reference isn't a copy but rather the actual object state. With C# and Visual Basic .NET compiled code, after an unbox instruction comes the ldind instruction (load value indirect onto the stack) or ldobj (copy value type to the stack). // Convert the value into a System.Reflection.Emit.LocalToken unbox System.Reflection.Emit.LocalToken // Get the value onto the stack ldobj System.Reflection.Emit.LocalToken unbox [mscorlib]System.Int16 Int16 // object ldind.i2 the // Put the object's value onto // stack. call Call a method 235 // Convert the value to an void set_Indent(int32 'value') il managed
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callvirt Call a method associated at run time with an object The call instruction calls static and nonvirtual normal methods. Virtual methods and interface methods use the callvirt instruction. Arguments are placed in left-to-right order. Note that this order is the opposite of most calling conventions in the IA32 world. Here is an example of using callvirt: // Load the parameter. ldfld class System.String System.CodeDOM.Compiler.CompilerResults::pathToAssembly // Call the virtual method set_CodeBase. callvirt instance void [mscorlib] System.Reflection.AssemblyName::set_CodeBase (class System.String) ldarg.0 ldarg.1 ldnull callvirt instance void System.Diagnostics.TraceListener::Fail(class System.String class System.String) ret Other Reverse Engineering Tools ILDASM is an excellent tool, but I want to mention two other tools that I find invaluable. For both of these tools, the price is right they are free! The first is Lutz Roeder's .NET Reflector (, which does everything that ILDASM does and much more. One of .NET Reflector's key features is that you can easily search for types in an assembly. You'd hope everyone would properly document all the custom exceptions they throw, but they don't always do so. With .NET Reflector, select Type Search and, in the Type Search window, above the Type field, type in except. All types that have exception in the name are shown. At times, it's extremely valuable to see at a glance which methods a particular method calls. In .NET Reflector, in the tree control, highlight the particular method you're interested in and select Call Tree from the View menu. In the Call Tree window, expand any subcalls to see exactly what calls what from that method. It's an outstanding way to see how things fit together. Finally, .NET Reflector's disassembly view is superior to ILDASM's. After selecting the method you want to view, press the Enter key to make the Disassembler window pop right up. If you're curious about what an instruction does, simply move the cursor over the instruction to make a tool tip pop up with an explanation. Parameter and local types as well as methods called by call instructions are underlined. Simply click on the item, and the main .NET Reflector window will jump to the type or method so that you can examine it. The second tool I want to mention is called Anakrino, which is a Greek word meaning "to examine" or "judge." Anakrino is a decompiler for .NET that shows the C# or Managed 236 // Return to caller. // Load the this pointer, which is // always the first parameter. // Load argument one. // Load a null value // Call the virtual function
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Extensions for C++ code for an assembly. Anakrino was written by Jay Freeman and is downloadable from Unlike .NET Reflector, Anakrino has source code available. Although Anakrino isn't perfect, it's a fantastic way to learn about how the .NET Framework code all fits together. Using Anakrino is self-explanatory, so I won't bother to go into it. One caveat I will mention is that the source code is quite "original" with a huge amount of template usage, so you'll need to make a serious commitment if you want to extend it. A few commercial decompilers that produce better output have been released at the time of this writing, but they're prohibitively expensive, so Anakrino's foibles are perfectly acceptable. Summary Although managed code is terrific because we no longer have to mess with memory corruptions and leaks, we still have to know how to use the debugging features. In this chapter, I concentrated on the unique issues associated with Visual Studio .NET and debugging managed applications. I started by discussing the issues particular to advanced breakpoints. It's absolutely wonderful that Visual Studio .NET can call methods and properties from conditional breakpoints, but it means you must be extra careful to avoid causing side effects in your breakpoints. Also remember that if you mess up the condition, the debugger won't stop if it can't properly evaluate the condition. The exciting Watch window offers all sorts of extra power for managed applications. With its full expression evaluator, you can easily call methods and properties so that you can influence debugging behavior to help your testing efforts. Additionally, for C# and Managed Extensions for C++ applications, you can add your custom types to the autoexpand rules to make debugging even faster. Finally, although you might never program in MSIL, it's simple to learn and can help you truly see what the .NET Framework class library is doing behind the scenes. If you'd like more information about MSIL, make sure to check out Partition III CIL.DOC, which you can find in <Visual Studio .NET installation directory>\SDK\v1.1\Tools Developers Guide\docs. In that information, you'll find the lowdown on every instruction and what each does.
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