From a8afb2a623b8644f9460be66d99c073579e23df0 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 2 Aug 2010 23:06:43 +0000
Subject: [PATCH] Add a lint check for indirectbr with no successors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110074 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/Lint.cpp | 3 +++
 test/Other/lint.ll    | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Analysis/Lint.cpp b/lib/Analysis/Lint.cpp
index 949bbbd8b6c..5624430332a 100644
--- a/lib/Analysis/Lint.cpp
+++ b/lib/Analysis/Lint.cpp
@@ -519,6 +519,9 @@ void Lint::visitVAArgInst(VAArgInst &I) {
 
 void Lint::visitIndirectBrInst(IndirectBrInst &I) {
   visitMemoryReference(I, I.getAddress(), ~0u, 0, 0, MemRef::Branchee);
+
+  Assert1(I.getNumDestinations() != 0,
+          "Undefined behavior: indirectbr with no destinations", &I);
 }
 
 void Lint::visitExtractElementInst(ExtractElementInst &I) {
diff --git a/test/Other/lint.ll b/test/Other/lint.ll
index dee3d11d2fb..fcef7ee2d57 100644
--- a/test/Other/lint.ll
+++ b/test/Other/lint.ll
@@ -161,5 +161,7 @@ declare i32 @nonstruct_callee() nounwind
 define void @struct_caller() nounwind {
 entry:
   call %struct bitcast (i32 ()* @foo to %struct ()*)()
-  ret void
+
+  ; CHECK: Undefined behavior: indirectbr with no destinations
+  indirectbr i8* null, []
 }
-- 
2.34.1