From 5127ff928b4dece075f278721b801135105938bd Mon Sep 17 00:00:00 2001
From: Philip Reames <listmail@philipreames.com>
Date: Tue, 21 Oct 2014 20:56:29 +0000
Subject: [PATCH] Extend the verifier to check usage of 'nonnull' metadata.

The recently added !nonnull metadata is only valid on loads of pointer type.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220323 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/IR/Verifier.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/IR/Verifier.cpp b/lib/IR/Verifier.cpp
index 154d54870ef..3060baa52e2 100644
--- a/lib/IR/Verifier.cpp
+++ b/lib/IR/Verifier.cpp
@@ -2287,6 +2287,14 @@ void Verifier::visitInstruction(Instruction &I) {
     visitRangeMetadata(I, Range, I.getType());
   }
 
+  if (I.getMetadata(LLVMContext::MD_nonnull)) {
+    Assert1(I.getType()->isPointerTy(),
+            "nonnull applies only to pointer types", &I);
+    Assert1(isa<LoadInst>(I),
+            "nonnull applies only to load instructions, use attributes"
+            " for calls or invokes", &I);
+  }
+
   InstsInThisBlock.insert(&I);
 }