[cfe-dev] type qualifiers

[John McCall]

On Mar 27, 2010, at 7:12 AM, Mattias Holm wrote:

> In include/clang/AST/Type.h there is a comment saying:
> 
> 
> /// The maximum supported address space number.
> /// 24 bits should be enough for anyone.
> MaxAddressSpace = 0xffffffu,
> 
> However, later in that file the following appears:
> 
> // bits:  |0 1 2|3 .. 4|5  ..  31|
> //          |C R V|GCAttr|AddrSpace|
> 
> uint32_t Mask;
> 
> static const uint32_t GCAttrMask = 0x18;
> static const uint32_t GCAttrShift = 3;
> static const uint32_t AddressSpaceMask = ~(CVRMask | GCAttrMask);  
> static const uint32_t AddressSpaceShift = 5;
> 
> 
> So, the question is, is the address space supposed to be 24 bits or 27 bits as suggested by the AddressSpaceMask? I am interested in stealing some bits from the qualifier class in order to add some additional experimental type qualifiers.

24;  there are currently three bits spare.  But you can just add extra data to Qualifiers if it helps.

John.