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ilasm Directives and Attributes

  • Jason Bock

Abstract

In this chapter, I’ll talk about the different ilasm directives and attributes that are available for the CIL developer. I’ll work from the essential directives that are needed for any valid assembly to the directives that define the custom types and their associated elements (for example, methods and fields).

Keywords

Calling Convention Method Signature Instance Method Assembly Directive Code Snippet 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Reference

  1. 1.
    To understand how the runtime actually resolves which assembly to load, check out the article entitled “How the Runtime Locates Assemblies” in the SDK.Google Scholar
  2. 2.
    I won’t discuss. os and. proces sor, as they are only used for documentation purposes in an assembly. See Section 6.2.2.3 of Partition II for more information.Google Scholar
  3. 3.
    See Sections 21.10 and 22.3 of Partition II for more detailed information on how to declare custom attributes.Google Scholar
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    See Section 21.11 of Partition II to find a detailed explanation of why. permission isn’t used to declare security metadata.Google Scholar
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    For more information on what DLL Hell is all about, please read Steven Pratschner’s article, “Simplifying Deployment and Solving DLL Hell with the.NET Framework,” which can be found at http://msdn.microsoft.com/library/en-us/dndotnet/html/dplywithnet.asp?frame=true.
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    To be valid, though, both SimpleStruct and SimpleValueType should contain at least one member, like a field, but I haven’t covered type members yet.Google Scholar
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    See Section 9.7 of Partition II for more information on layouts.Google Scholar
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    Actually, this isn’t correct given the code here—you could compile it and it would work fine. Once you’ve read the discussion on constructors, though, come back to this example and add constructors to these types; you’ll find out that ExtendlnvisibleType won’t work anymore. The code sample has the constructor added for these types.Google Scholar
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    There are two other attributes you can use, specialname and rtspecialname, but they’re ignored by the runtime. See Section 9.1.6 of Partition II.Google Scholar
  15. 16.
    Although it’s out of the scope of this discussion, keep in mind that there may be issues with static fields in multithreading scenarios.Google Scholar
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    See Section 15.2 of Partition II for the full documentation on the field initialization syntax.Google Scholar
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    I won’t cover accessibility attributes again for methods, as I’ve already covered them with fields.Google Scholar
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    That’s how C# gets its this reference and VB.NET gets its Me reference.Google Scholar
  19. 22.
    Section 14.3 of Partition II hints that there are 10 other attributes for different calling conventions, but it doesn’t explicitly state what they are.Google Scholar
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    I realize you just read a discussion about instance methods and the instance reference being the first argument, so in this case you have five arguments. To avoid confusion, I won’t mention or include this implicit instance argument unless I have to clarify a specific issue.Google Scholar
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    Although I’ll cover VB.NET and C# compiler results in Chapter 6, I’d like to note here that the C# compiler will always add beforefieldinit if a type does not have a type initializer. If there is a type initializer, this attribute is not added.Google Scholar
  24. 27.
    See Section 24.3.3.1 of Partition II.Google Scholar
  25. 28.
    It’ll also keeps your methods verifiable—see Section 14.4.1.3 of Partition II for details.Google Scholar
  26. 29.
    Read Section 13.6 of Partition II for an interesting note on why you can’t derive from Sy stem. Delegate directly.Google Scholar

Copyright information

© Jason Bock 2002

Authors and Affiliations

  • Jason Bock

There are no affiliations available

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