METHODS in VB.NET

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CHAPTER 10 METHODS
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map, which is a record in the ImplMap metadata table specifying the unmanaged DLL exporting the method and the method s unmanaged calling convention. If the DLL name in <pinvoke_spec> is provided, the method s RVA must be 0, because the method is implemented externally. If the DLL name is not specified or the <pinvoke_spec> itself is not provided that is, the parentheses are empty the defined method is a local P/Invoke, implemented in unmanaged native code embedded in the current PE file; in this case, its RVA must not be 0 and must point to the location, in the current PE file, of the native method s body. unmanagedexp (0x0008). The managed method is exposed as an unmanaged export. This flag is not currently used by the common language runtime. Reserved flags (cannot be set explicitly; mask 0xD000): rtspecialname (0x1000). The method has a special name reserved for the internal use of the runtime. Four method names are reserved: .ctor for instance constructors, .cctor for class constructors, _VtblGap* for v-table placeholders, and _Deleted* for methods marked for deletion but not actually removed from metadata. The keyword rtspecialname is ignored by the IL assembler and is displayed by the IL disassembler for informational purposes only. This flag must be accompanied by a specialname flag. [no ILAsm keyword] (0x4000). The method either has an associated DeclSecurity metadata record that holds security details concerning access to the method or has the associated custom attribute System.Security.SuppressUnmanagedCodeSecurityAttribute. reqsecobj (0x8000). This method calls another method containing security code, so it requires an additional stack slot for a security object. This flag is formally under the Reserved mask, so it cannot be set explicitly. Setting this flag requires emitting the pseudocustom attribute System.Security.DynamicSecurityMethodAttribute. When the IL assembler encounters the keyword reqsecobj, it does exactly that: emits the pseudocustom attribute and thus sets this reserved flag. Since anybody can set this flag by emitting the pseudocustom attribute, I wonder what the reason was for putting this flag under the Reserved mask. This flag could just as well been left as assignable. I ve used the word implementation here and there rather extensively; perhaps some clarification is in order, to avoid confusion. First, note that method implementation in the sense of one method providing the implementation for another is discussed later in this chapter. Implementation-specific flags of a method are not related to that topic; rather, they indicate the features of implementation of the current method. Second, a Method record contains two binary flag entries: Flags and ImplFlags (implementation flags). It so happens that part of Flags (mask 0x2C08) is also implementation related. That s a lot of implementations. Thus far, I have been talking about the implementation part of Flags. For information about ImplFlags, see Method Implementation Flags later in this chapter.
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CHAPTER 10 METHODS
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A method name in ILAsm either is a simple name or (in version 2.0 only) a dotted name or is one of the two keywords .ctor or .cctor. As you already know, .ctor is the reserved name for instance constructors, while .cctor is reserved for class constructors, or type initializers. In ILAsm, .ctor and .cctor are keywords, so they should not be single quoted as any other irregular simple name. The general requirements for a method name are straightforward: the name must contain 1 to 1,023 bytes in UTF-8 encoding plus a zero terminator, and it should not match one of the four reserved method names unless you really mean it. If you give a method one of these reserved names, the common language runtime treats the method according to this name.
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Method Implementation Flags
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The nonterminal symbol <impl> in the method definition form denotes the implementation flags of the method (the ImplFlags entry of a Method record). The implementation flags are defined in the enumeration CorMethodImpl in CorHdr.h and are described in the following list: Code type (mask 0x0003): cil (0x0000). The default. The method is implemented in common intermediate language (CIL, a.k.a. IL or MSIL). Yes, I realize that CIL does not sound like a good abbreviation for those familiar with the innards of the Visual C++ compiler, because in that area it traditionally means C intermediate language. You can use the il keyword if you don t like cil. Or don t use either of them; it is a default flag anyway. native (0x0001). The method is implemented in native platform-specific code. optil (0x0002). The method is implemented in optimized IL. The optimized IL is not supported in existing releases of the common language runtime, so this flag should not be set. runtime (0x0003). The method implementation is automatically generated by the runtime itself. Only certain methods from the base class library (Mscorlib.dll) carry this flag. If this flag is set, the RVA of the method must be 0. Code management (mask 0x0004): managed (0x0000). The default. The code is managed. In the existing releases of the runtime, this flag cannot be paired with the native flag. unmanaged (0x0004). The code is unmanaged. This flag must be paired with the native flag. Implementation and interoperability (mask 0x10D8): forwardref (0x0010). The method is defined, but the IL code of the method is not supplied. This flag is used primarily in edit-and-continue scenarios and in managed object files, produced by the Visual C++ compiler. This flag should not be set for any of the methods in a managed PE file.
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