[cfe-commits] r54794 - in /cfe/trunk: include/clang/Lex/Token.h include/clang/Parse/Parser.h lib/Lex/Lexer.cpp lib/Parse/Parser.cpp lib/Sema/Sema.cpp lib/Sema/Sema.h lib/Sema/SemaExpr.cpp lib/Sema/SemaExprObjC.cpp

Chris Lattner clattner at apple.com
Sat Aug 23 17:00:31 PDT 2008

On Aug 14, 2008, at 3:04 PM, Daniel Dunbar wrote:

> Author: ddunbar
> Date: Thu Aug 14 17:04:54 2008
> New Revision: 54794
> URL: http://llvm.org/viewvc/llvm-project?rev=54794&view=rev
> Log:
> Change Parser & Sema to use interned "super" for comparions.
> - Added as private members for each because it is not clear where to
>   put the common definition. Perhaps the IdentifierInfos all of these
>   "pseudo-keywords" should be collected into one place (this would
>   KnownFunctionIDs and Objective-C property IDs, for example)

Nice change!

Maybe these should be moved into a new object owned by ASTContext.   
The nice thing about doing this is that we could actually fix some  
efficiency issues as well.  At startup time, various subsystems (e.g.  
Sema) look up a bunch of interned strings for future comparisons.   
However, if they are never used, this lookup is wasted, and it could  
cause an extra string to be interned.  When clang is used as a  
library, this can be a significant startup time hit.

I admit that this is mostly an issue for the preprocessor, and is  
basically unavoidable there (it had to add all the predefined macros  
to the identifier table and macro tables), but it would be nice to not  
abuse IdentifierTable any more than we have to.


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