From 3f58e9b36a351eb9ea446fc2d43108a237a3f79f Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Mon, 16 Feb 2015 06:04:53 +0000
Subject: [PATCH] DebugInfo: Don't crash if 'Debug Info Version' has a strange
 value

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229356 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/IR/DebugInfo.cpp                         | 2 +-
 test/Assembler/invalid-debug-info-version.ll | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 test/Assembler/invalid-debug-info-version.ll

diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index 31f1e19a945..deeaae7d5de 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -1537,7 +1537,7 @@ bool llvm::StripDebugInfo(Module &M) {
 }
 
 unsigned llvm::getDebugMetadataVersionFromModule(const Module &M) {
-  if (auto *Val = mdconst::extract_or_null<ConstantInt>(
+  if (auto *Val = mdconst::dyn_extract_or_null<ConstantInt>(
           M.getModuleFlag("Debug Info Version")))
     return Val->getZExtValue();
   return 0;
diff --git a/test/Assembler/invalid-debug-info-version.ll b/test/Assembler/invalid-debug-info-version.ll
new file mode 100644
index 00000000000..94a81538562
--- /dev/null
+++ b/test/Assembler/invalid-debug-info-version.ll
@@ -0,0 +1,5 @@
+; RUN: opt < %s -S | FileCheck %s
+
+!llvm.module.flags = !{!0}
+!0 = !{i32 1, !"Debug Info Version", !""}
+; CHECK: !{i32 1, !"Debug Info Version", !""}