Inline asm constraints: allow ICE-like pointers for the "n" constraint (PR40890)

Apparently GCC allows this, and there's code relying on it (see bug).

The idea is to allow expression that would have been allowed if they
were cast to int. So I based the code on how such a cast would be done
(the CK_PointerToIntegral case in IntExprEvaluator::VisitCastExpr()).

Differential Revision: https://reviews.llvm.org/D58821

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@355491 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/include/clang/AST/APValue.h b/include/clang/AST/APValue.h
index 5d26a11177..de5546f9fd 100644
--- a/include/clang/AST/APValue.h
+++ b/include/clang/AST/APValue.h
@@ -262,6 +262,12 @@ public:
     return const_cast<APValue*>(this)->getInt();
   }
 
+  /// Try to convert this value to an integral constant. This works if it's an
+  /// integer, null pointer, or offset from a null pointer. Returns true on
+  /// success.
+  bool toIntegralConstant(APSInt &Result, QualType SrcTy,
+                          const ASTContext &Ctx) const;
+
   APFloat &getFloat() {
     assert(isFloat() && "Invalid accessor");
     return *(APFloat*)(char*)Data.buffer;