simplifies some code.

llvm-svn: 67993

llvm-svn: 67992

llvm-svn: 67991

pointer's expected number of zero low-bits.

This should fix the breakage I introduced recently.

llvm-svn: 67990

llvm-svn: 67989

llvm::PointerUnion class.

llvm-svn: 67988

you to do things like:

  ///    PointerUnion<int*, float*> P;
  ///    P = (int*)0;
  ///    printf("%d %d", P.is<int*>(), P.is<float*>()); // prints "1 0"
  ///    X = P.get<int*>();     // ok.
  ///    Y = P.get<float*>();   // runtime assertion failure.
  ///    Z = P.get<double*>();  // does not compile.
  ///    P = (float*)0;
  ///    Y = P.get<float*>();   // ok.
  ///    X = P.get<int*>();     // runtime assertion failure.

llvm-svn: 67987

some pointer instances have properties that not all of a type have.

llvm-svn: 67986

llvm-svn: 67985

llvm-svn: 67984

llvm-svn: 67983

in the low bit position a little bit (haha).

llvm-svn: 67982

llvm-svn: 67981

llvm-svn: 67980

function with a new NumLowBitsAvailable enum, which makes the
value available as an integer constant expression.

Add PointerLikeTypeTraits specializations for Instruction* and
Use** since they are only guaranteed 4-byte aligned.

Enhance PointerIntPair to know about (and enforce) the alignment
specified by PointerLikeTypeTraits.  This should allow things 
like PointerIntPair<PointerIntPair<void*, 1,bool>, 1, bool> 
because the inner one knows that 2 low bits are free.

llvm-svn: 67979

llvm-svn: 67978

llvm-svn: 67977

llvm-svn: 67976

llvm-svn: 67975

to PointerLikeTypeTraits.

llvm-svn: 67974

# low bits free, and move to its own header.

llvm-svn: 67973

llvm-svn: 67972

hackish workarounds from memdep

llvm-svn: 67971

llvm-svn: 67970

really intending to take ownership of this; I wrote this mostly because 
I was curious about how the ARM ABI works.  It should be a decent start, 
though.

llvm-svn: 67969

to work around this.

llvm-svn: 67968

it to be stuck into a SmallPtrSet.

llvm-svn: 67967

More improvements to namespace aliases. We now support everything except aliases in using directives.

llvm-svn: 67966

llvm-svn: 67965

llvm-svn: 67964

Let getIdentifierNamespaceForKind know about aliases and have it treat them just like namespace decls.

llvm-svn: 67963

llvm-svn: 67962

llvm-svn: 67961

<rdar://problem/6732151>.

llvm-svn: 67954

llvm-svn: 67953

pointer.  Its purpose in life is to be a glorified void*, but which does not
implicitly convert to void* or other OpaquePtr's with a different UID.

Introduce Action::DeclPtrTy which is a typedef for OpaquePtr<0>.  Change the 
entire parser/sema interface to use DeclPtrTy instead of DeclTy*.  This
makes the C++ compiler enforce that these aren't convertible to other opaque
types.

We should also convert ExprTy, StmtTy, TypeTy, AttrTy, BaseTy, etc,
but I don't plan to do that in the short term.

The one outstanding known problem with this patch is that we lose the 
bitmangling optimization where ActionResult<DeclPtrTy> doesn't know how to
bitmangle the success bit into the low bit of DeclPtrTy.  I will rectify
this with a subsequent patch.

llvm-svn: 67952

llvm-svn: 67951

llvm-svn: 67950

llvm-svn: 67949

llvm-svn: 67948