[cfe-dev] Displaying prototype tooltips in an IDE

[Jared Low]

I do need the parameter info. 

clang_getCursorDisplayName returns "void VarArgFunc(int, ...)", and I want 
to display the name of the parameters too: "void VarArgFunc(int p1, ...)"

Your suggestion did help me, however. I didn't realize that 
clang_getCursorDisplayName provided the parameter types. So I can use that 
to figure out if the function has a variable argument or not.

Thanks for the help.




From:   Argyrios Kyrtzidis <akyrtzi at gmail.com>
To:     Jared Low <jared.low at ni.com>
Cc:     cfe-dev at cs.uiuc.edu
Date:   08/23/2011 09:15 PM
Subject:        Re: [cfe-dev] Displaying prototype tooltips in an IDE



Is clang_getCursorDisplayName on the function sufficient for your purposes 
or you need the parameter info ?

On Aug 23, 2011, at 4:43 PM, Jared Low wrote:

We are using Clang as our compiler, and I want to display prototype 
tooltips in the IDE. I'm using libclang to get various source code 
browsing information. 

In order to get the prototype information, I create the translation unit 
with clang_createTranslationUnit. Then I traverse the translation unit 
with clang_visitChildren. Whenever I come upon a cursor of kind 
CXCursor_FunctionDecl, I remember the cursor and then add any cursors of 
kind CXCursor_ParmDecl that follow to a parameter list. Then when I want 
to display the function prototype, I go thru the parameter cursor list, 
getting each parameter's type and name. 

This seems to work fine, except for variable argument functions. For 
example, for the function 

void VarArgFunc(int p1, ...) 
{ 
        va_list        parmInfo; 
        va_start(parmInfo, p1); 
        va_end(parmInfo); 
} 

when traversing the translation unit with clang_visitChildren, the 
CXCursorVisitor callback is not called for the '...' variable argument 
parameter. This means that I can't tell that the function has a variable 
argument parameter, and when I show the prototype tooltip, it just shows 
"void VarArgFunc(int p1)". 

How can I detect that the function has a variable argument parameter? Is 
there some other better way to get this information? 

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