Making the Coding Easier in Visual Basic .NET

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CHAPTER
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Making the Coding Easier
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don t know about you, but for me this endless typing and retyping of the same code again and again is fun way below the average. Let s see how ILAsm 2.0 can make this work less tedious. There are three useful additions to the assembler syntax that can be exploited: aliasing, compilation control directives, and special keywords for the current class and its parent.
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Aliasing
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In the sample Simple2.il presented in the previous chapter, the methods of console input/ output were called four times (one time for input and three times for output). And every time I had to type [mscorlib]System.Console::WriteLine or [mscorlib]System.Console::ReadLine. In ILAsm 1.0 and 1.1 I had no choice, but in ILAsm 2.0 I can use aliasing, assigning new short names to methods, classes, and so on. Listing 3-1 shows the simple sample from the previous chapters with aliasing (source file Simple3.il). And, by the way, while at it, let s get rid of unnecessary default declarations. Listing 3-1. Simple3.il with Aliasing //----------- Program header .assembly extern mscorlib { auto } .assembly OddOrEven { } .module OddOrEven.exe //----------- Aliasing .typedef [mscorlib]System.Console as TTY .typedef method void TTY::WriteLine(string) as PrintLine //----------- Class Declaration .class public Odd.Or.Even { //------------ Field declaration .field public static int32 val //------------ Method declaration .method public static void check( ) { .entrypoint .locals init (int32 Retval) AskForNumber: ldstr "Enter a number" call PrintLine .try {
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CHAPTER 3 MAKING THE CODING EASIER
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// Guarded block begins call string TTY::ReadLine() // pop // ldnull ldstr "%d" ldsflda int32 Odd.or.Even::val call vararg int32 sscanf(string,string,...,int32*) stloc.0 leave.s DidntBlowUp // Guarded block ends } catch [mscorlib]System.Exception { // Exception handler begins pop ldstr "KABOOM!" call PrintLine leave.s Return } // Exception handler ends DidntBlowUp: ldloc.0 brfalse.s Error ldsfld int32 Odd.or.Even::val ldc.i4.1 and brfalse.s ItsEven ldstr "odd!" br.s PrintAndReturn ItsEven: ldstr "even!" br.s PrintAndReturn Error: ldstr "How rude!" PrintAndReturn: call PrintLine ldloc.0 brtrue.s AskForNumber Return: ret } // End of method } // End of class //------------ Calling unmanaged code .method public static pinvokeimpl("msvcrt.dll" cdecl) vararg int32 sscanf(string,string) { }
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CHAPTER 3 MAKING THE CODING EASIER
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Right after the program header, I have defined the aliases of class [mscorlib]System.Console and of its method WriteLine(string): //----------- Aliasing .typedef [mscorlib]System.Console as TTY .typedef method void TTY::WriteLine(string) as PrintLine Aliases in ILAsm are introduced by the .typedef keyword this is similar to the typedef keyword in C. (Note that this is not related to the TypeDef mentioned in 1 an entry in a metadata table that describes a class or value type.) Aliases can be defined for a class, a method, a field, or a custom attribute. (Custom attributes are described in 16.) Once an alias is introduced, it can be used anywhere instead of the aliased item. You have probably noticed that the second aliasing directive uses the alias defined by the first aliasing directive. When a method is being aliased, its definition starts with the keyword method and includes the full name and signature of the aliased method. The same approach is used when aliasing a field, but in this case, of course, the leading keyword is field. Aliasing the custom attributes should not concern you at the moment (because I have not explained yet what a custom attribute is), so I suggest waiting until 16. The aliases are defined modulewide, which means once you define an alias, you can use it anywhere in this module. It also means once you define an alias, you cannot redefine it within this module. This is different from the C++ aliasing provided by the typedef directive, which can be scoped to a class or a method. The aliases must be defined lexically before they are used. The alias names must be unique within the module; you cannot alias two different things and name both of them, say, Foo. On the other hand, you can alias the same item (class, method, field, or custom attribute) more than once. The following is perfectly legal: .typedef .typedef ... call ... call [mscorlib]System.Console as TTY [mscorlib]System.Console as CON void TTY::WriteLine(string) void CON::WriteLine(string)
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An interesting feature of aliases is that they survive round-tripping (assembling and disassembling). If you compile Simple3.il and then disassemble the resulting file Simple3.exe, you will see the aliases TTY and PrintLine all present and accounted for. This is because the ILAsm compiler stores all aliases in the metadata of the emitted module, and the disassembler looks for the aliases and uses them. You might also notice that I got rid of the .namespace directive and declared the class Odd.Or.Even by its full name. This is another feature of ILAsm 2.0 that, in my opinion, makes the programmer s life easier, because this way the classes are defined and referenced uniformly. Besides, using the .namespace directive led to interesting questions such as, If I define a global method Z within namespace X.Y, should I refer to this method as X.Y::Z (The answer is no, you refer to it as Z; namespaces are for the classes only.) This does not mean, of course, that ILAsm 2.0 does not understand the .namespace directive. ILAsm 2.0 is fully backward compatible, which means it can compile the sources the previous versions could compile.
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