Mark C++ reference parameters as dereferenceable
Because references must be initialized using some evaluated expression, they
must point to something, and a callee can assume the reference parameter is
dereferenceable. Taking advantage of a new attribute just added to LLVM, mark
them as such.
Because dereferenceability in addrspace(0) implies nonnull in the backend, we
don't need both attributes. However, we need to know the size of the object to
use the dereferenceable attribute, so for incomplete types we still emit only
nonnull.
llvm-svn: 213386
diff --git a/clang/test/CodeGenObjCXX/message-reference.mm b/clang/test/CodeGenObjCXX/message-reference.mm
index 37230d1..6b341f8 100644
--- a/clang/test/CodeGenObjCXX/message-reference.mm
+++ b/clang/test/CodeGenObjCXX/message-reference.mm
@@ -15,6 +15,6 @@
}
@end
-// CHECK: [[T:%.*]] = call nonnull i32* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend
+// CHECK: [[T:%.*]] = call dereferenceable({{[0-9]+}}) i32* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend
// CHECK: [[U:%.*]] = load i32* [[T]]
// CHECK [[V:%.*]] = icmp eq i32 [[U]], 0