[cfe-dev] libclang, initializers and constant folding

[Vinay Sajip]

Douglas Gregor <dgregor at ...> writes:

> There is currently no libclang API for this. One could be added, if needed.

Well, I need such an API :-) There was also a question about this (from someone
else) on the mailing list, earlier this year.

I'm very new to the clang code base, so I tried implementing the functionality
using an experimental function like this:

int clang_getCursorValue(CXCursor C)
{
    int result = 0;
    Decl * D = getCursorDecl(C);

    if (isa<EnumConstantDecl>(D)) {
    	llvm::APSInt Value = static_cast<EnumConstantDecl *>(D)->getInitVal();

    	result = (int) Value.getSExtValue();
    }
    return result;
}

This works as far as it goes, giving the correct values for my earlier example,
but it's obviously incomplete.

Possibly there should be a set of functions such as

int clang_getCursorIntegerValue(CXCursor);
double clang_getCursorDoubleValue(CXCursor);
CXString clang_getCursorStringValue(CXCursor);

However, I have no idea if this gels with whoever designed the existing API.
What's the best way to move this forward?

Regards,

Vinay Sajip