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brfalse Error takes an item from the stack, and if it is 0, it branches (switches the computation flow) to the label Error. ldsfld int32 Odd.or.Even::val ldc.i4 1 and brfalse ItsEven ldstr "odd!" br PrintAndReturn ldsfld int32 Odd.or.Even::val is an instruction that loads the value of the static field Odd.or.Even::val onto the stack. If the code has proceeded this far, the string-to-integer conversion must have been successful, and the value that resulted from this conversion must be sitting in the field val. The last time you addressed this field, you used the instruction ldsflda to load the field address onto the stack. This time you need the value, so you use ldsfld. ldc.i4 1 is an instruction that loads the constant 1 of type int32 onto the stack. Instruction and takes two items from the stack the value of the field val and the integer constant 1 performs a bitwise AND operation and puts the result onto the stack. Performing the bitwise AND operation with 1 zeroes all the bits of the value of val except the leastsignificant bit. brfalse ItsEven takes an item from the stack (the result of the bitwise AND operation), and if it is 0, it branches to the label ItsEven. The result of the previous instruction is 0 if the value of val is even, and it is 1 if the value is odd. ldstr "odd!" is an instruction that loads the string odd! onto the stack. br PrintAndReturn is an instruction that does not touch the stack and branches unconditionally to the label PrintAndReturn. The rest of the code in the Odd.or.Even::check method should be clear. This section has covered all the instructions used in this method except ret, which is fairly obvious: it returns whatever is on the stack. If the method s return type does not match the type of the item on the stack, the JIT compiler will disapprove, throw an exception, and abort the compilation. It will do the same if the stack contains more than one item by the time ret is reached or if the method is supposed to return void (that is, not return anything) and the stack still contains an item or, conversely, if the method is supposed to return something and the stack is empty.
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Global Items
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These are the global items of the OddOrEven application: { ... } // End of namespace .field public static valuetype CharArray8 Format at FormatData .field public static valuetype CharArray8 Format at FormatData declares a static field named Format of type valuetype CharArray8. As you might remember, you used a reference to this field in the method Odd.or.Even::check. This field differs from, for example, the field Odd.or.Even::val because it is declared outside any class scope and hence does not belong to any class. It is thus a global item. Global items belong to the module containing their declarations. As you ve learned, a module is a
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managed executable file (EXE or DLL); one or more modules constitute an assembly, which is the primary building block of a managed .NET application; and each assembly has one prime module, which carries the assembly identification information in its metadata. Actually, a little trick is connected with the concept of global items not belonging to any class. In fact, the metadata of every module contains one special TypeDef named <Module>, which represents any guesses Yes, you are absolutely right. This TypeDef is always present in the metadata, and it always holds the honorable first position in the TypeDef table. However, <Module> is not a proper TypeDef, because its attributes are limited compared to normal TypeDefs (classes, value types, and so on). This sounds almost like real life the more honorable the position you hold, the more limited your options are. <Module> cannot be public, that is, visible outside its assembly. <Module> can have only static members, which means all global fields and methods must be static. In addition, <Module> cannot have events or properties because events and properties cannot be static. (Consult 15 for details.) The reason for this limitation is obvious: given that an assembly always contains exactly one instance of every module, the concept of instantiation becomes meaningless. The accessibility of global fields and methods differs from the accessibility of member fields and methods belonging to a normal class. Even public global items cannot be accessed from outside the assembly. <Module> does not extend anything that is, it has no base class and no class can inherit from <Module>. However, all the classes declared within a module have full access to the global items of this module, including the private ones. This last feature is similar to class nesting and is quite different from class inheritance. (Derived classes don t have access to the private items of their base classes.) A nested class is a class declared within the scope of another class. That other class is usually referred to as an enclosing class or an encloser. A nested class is not a member class or an inner class in the sense that it has no implicit access to the encloser s instance reference (this). A nested class is connected to its encloser by three facts only: it is declared within the encloser s lexical scope; its visibility is filtered by the encloser s visibility (that is, if the encloser is private, the nested class will not be visible outside the assembly, regardless of its own visibility); and it has access to all of the encloser s members. Because all the classes declared within a module are by definition declared within the lexical scope of the module, it is only logical that the relationship between the module and the classes declared in it is that of an encloser and nested classes. As a result, global item accessibilities public, assembly, and famorassem all amount to assembly; private, family, and famandassem amount to private; and privatescope is, well, privatescope. The metadata validity rules explicitly state that only three accessibilities are permitted for the global fields and methods: public (which is actually assembly), private, and privatescope. The loader, however, is more serene about the accessibility flags of the global items: it allows any accessibility flags to be set, interpreting them as just described (as assembly, private, or privatescope).
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