Add missing dereferenceable_or_null getters

Summary: Add missing dereferenceable_or_null getters required for
http://reviews.llvm.org/D9253 change. Separated from the D9253 review.

Patch by Artur Pilipenko!

Reviewers: sanjoy

Reviewed By: sanjoy

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9499

llvm-svn: 236615

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp
index ced989ab11d..aea4bf52701 100644
--- a/llvm/lib/IR/Function.cpp
+++ b/llvm/lib/IR/Function.cpp
@@ -117,6 +117,12 @@ uint64_t Argument::getDereferenceableBytes() const {
   return getParent()->getDereferenceableBytes(getArgNo()+1);
 }
 
+uint64_t Argument::getDereferenceableOrNullBytes() const {
+  assert(getType()->isPointerTy() &&
+         "Only pointers have dereferenceable bytes");
+  return getParent()->getDereferenceableOrNullBytes(getArgNo()+1);
+}
+
 /// hasNestAttr - Return true if this argument has the nest attribute on
 /// it in its containing function.
 bool Argument::hasNestAttr() const {