NAMESPACES AND CLASSES in VB.NET

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CHAPTER 7 NAMESPACES AND CLASSES
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[run time] The combined length of the strings referenced by the Name and Namespace entries must not exceed 1,023 bytes. The table must contain no duplicate records with the same full name (the namespace plus the name) and ResolutionScope value.
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InterfaceImpl Table Validity Rules
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A Class entry set to nil means a deleted InterfaceImpl record. If the Class entry is non-nil, however, the following rules apply: [run time] The Class entry must hold a valid reference to the TypeDef table. [run time] The Interface entry must hold a valid reference to the TypeDef or TypeRef table. If the Interface field references the TypeDef table, the corresponding TypeDef record must have the interface flag set in the Flags entry. The table must contain no duplicate records with the same Class and Interface entries.
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The NestedClass entry must hold a valid reference to the TypeDef table. [run time] The EnclosingClass entry must hold a valid reference to the TypeDef table, one that differs from the reference held by the NestedClass entry. The table must contain no duplicate records with the same NestedClass entries. The table must contain no records with the same EnclosingClass entries and NestedClass entries referencing TypeDef records with matching names in other words, a nested class must have a unique name within its encloser. The table must contain no sets of records forming a circular nesting pattern for example, A nested in B, B nested in C, C nested in A.
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ClassLayout Table Validity Rules
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A Parent entry set to nil means a deleted ClassLayout record. However, if the Parent entry is non-nil, the following rules apply: The Parent entry must hold a valid reference to the TypeDef table, and the referenced TypeDef record must have the Flags bit explicit or sequential set and must have the interface bit not set. [run time] The PackingSize entry must be set to 0 or to a power of 2 in the range 1 to 128. The table must contain no duplicate records with the same Parent entries.
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CHAPTER
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Primitive Types and Signatures
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aving looked at how types are defined in the common language runtime and ILAsm, let s proceed to the question of how these types and their derivatives are assigned to program items fields, variables, methods, and so on. The constructs defining the types of program items are known as the signatures of these items. Signatures are built from encoded references to various classes and value types; I ll discuss signatures in detail in this chapter. But before we start analyzing the signatures of program items, let s consider the building blocks of these signatures.
Primitive Types in the Common Language Runtime
All types have to be defined somewhere. The Microsoft .NET Framework class library defines hundreds of types, and other assemblies build their own types based on the types defined in the class library. Some of the types defined in the class library are recognized by the common language runtime as primitive types and are given special encoding in the signatures. This is done only for the sake of performance theoretically, the signatures could have been built from type tokens only, given that every type is defined somewhere and hence has a token. But resolving all these tokens simply to find that they reference trivial items such as a 4-byte integer or a Boolean value can hardly be considered a sensible way to work at the run time.
Primitive Data Types
The term primitive data types refers to the types defined in the .NET Framework class library that are given specific individual type codes to be used in signatures. Because all these types are defined in the assembly Mscorlib and all belong to the namespace System, I have omitted the prefix [mscorlib]System when supplying the class library type name for a type. The individual type codes are defined in the enumeration CorElementType in the header file CorHdr.h. The names of all these codes begin with ELEMENT_TYPE_, which I have either omitted in this chapter or abbreviated as E_T_.
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