From f7e8acf0fc6c7031dc312ddc1e83496bdce2b454 Mon Sep 17 00:00:00 2001
From: Evgeniy Stepanov <eugeni.stepanov@gmail.com>
Date: Mon, 8 May 2017 23:46:20 +0000
Subject: Ignore !associated metadata with null argument.

Fixes PR32577 (comment 10).
Such metadata may legitimately appear in LTO.

llvm-svn: 302485
---
 llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen')

diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 34892680ace..1d232c71d82 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -232,7 +232,11 @@ static const MCSymbolELF *getAssociatedSymbol(const GlobalObject *GO,
   if (!MD)
     return nullptr;
 
-  auto *VM = dyn_cast<ValueAsMetadata>(MD->getOperand(0));
+  const MDOperand &Op = MD->getOperand(0);
+  if (!Op.get())
+    return nullptr;
+
+  auto *VM = dyn_cast<ValueAsMetadata>(Op);
   if (!VM)
     report_fatal_error("MD_associated operand is not ValueAsMetadata");
 
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