[cfe-dev] Get the number of bits of a bit field with libclang?

[Argyrios Kyrtzidis]

On May 22, 2012, at 12:37 PM, Jacob Carlborg wrote:

> On 2012-05-22 21:28, Argyrios Kyrtzidis wrote:
>> On May 22, 2012, at 11:42 AM, Jacob Carlborg wrote:
>> 
>>> Is it possible to get the number of bits of a bit field with libclang?
>>> 
>>> struct Foo
>>> {
>>>     int a : 1;
>>> };
>>> 
>>> I noticed I could traverse to the "value" of "a" and the type of the
>>> cursor was CXCursor_IntegerLiteral. But is it possible to get the actual
>>> value?
>> 
>> No, are you interested in submitting a patch ? I suggest something like "clang_Cursor_getBitWidthValue(CXCursor)" similar to how clang_Cursor_getNumArguments(CXCursor C) works, with the difference that it can return "unsigned" and 0 if the cursor is not a bitfield.
> 
> Probably in the long run if no one else does it. But right now I have 
> other things on my todo-list for my tool with higher priority.
> 
> Would two functions be a good idea, one for signed and one for unsigned 
> values? Just like "clang_getEnumConstantDeclValue" and 
> "clang_getEnumConstantDeclUnsignedValue".

No, negative values are not allowed for bitfield width.

> 
> -- 
> /Jacob Carlborg
> 
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