[FuzzMutate] Correctly split landingpad blocks

Differential Revision: https://reviews.llvm.org/D41112



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320571 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 29 insertions, 0 deletions

diff --git a/unittests/FuzzMutate/OperationsTest.cpp b/unittests/FuzzMutate/OperationsTest.cpp
index d18291e3df5..be1789e9475 100644
--- a/unittests/FuzzMutate/OperationsTest.cpp
+++ b/unittests/FuzzMutate/OperationsTest.cpp
@@ -211,6 +211,35 @@ TEST(OperationsTest, SplitBlock) {
   EXPECT_FALSE(verifyModule(M, &errs()));
 }
 
+TEST(OperationsTest, SplitEHBlock) {
+  // Check that we will not try to branch back to the landingpad block using
+  // regular branch instruction
+
+  LLVMContext Ctx;
+  const char *SourceCode =
+      "declare i32* @f()"
+      "declare i32 @personality_function()"
+      "define i32* @test() personality i32 ()* @personality_function {\n"
+      "entry:\n"
+      "  %val = invoke i32* @f()\n"
+      "          to label %normal unwind label %exceptional\n"
+      "normal:\n"
+      "  ret i32* %val\n"
+      "exceptional:\n"
+      "  %landing_pad4 = landingpad token cleanup\n"
+      "  ret i32* undef\n"
+      "}";
+  auto M = parseAssembly(SourceCode, Ctx);
+
+  // Get the landingpad block
+  BasicBlock &BB = *std::next(M->getFunction("test")->begin(), 2);
+
+  fuzzerop::OpDescriptor Descr = fuzzerop::splitBlockDescriptor(1);
+
+  Descr.BuilderFunc({ConstantInt::getTrue(Ctx)},&*BB.getFirstInsertionPt());
+  ASSERT_TRUE(!verifyModule(*M, &errs()));
+}
+
 TEST(OperationsTest, SplitBlockWithPhis) {
   LLVMContext Ctx;