[cfe-dev] Patch for TranslationUnitDecl

[Argiris Kirtzidis]

Hi,

A summary of the attached patch is this:

-Added TranslationUnitDecl class to serve as top declaration context
-ASTContext gets a TUDecl member and a getTranslationUnitDecl() function
-All ScopedDecls get the TUDecl as DeclContext when declared at global scope

Note that I didn't touch the objc decls, so TUDecl doesn't apply for 
them (getParent() of ObjCMethod will return null).
Someone more familiar with objc should probably sort out the DeclContext 
chains for them.


-Argiris

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