Postpone the deletion of the old name in StructType::setName to allow using a slice of the old name.

Fixes PR13522. Add a rudimentary unit test to exercise the behavior.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161296 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 30 insertions, 0 deletions

diff --git a/unittests/VMCore/TypesTest.cpp b/unittests/VMCore/TypesTest.cpp
new file mode 100644
index 00000000000..0416643221e
--- /dev/null
+++ b/unittests/VMCore/TypesTest.cpp
@@ -0,0 +1,30 @@
+//===- llvm/unittest/VMCore/TypesTest.cpp - Type unit tests ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DerivedTypes.h"
+#include "llvm/LLVMContext.h"
+#include "gtest/gtest.h"
+using namespace llvm;
+
+namespace {
+
+TEST(TypesTest, StructType) {
+  LLVMContext C;
+
+  // PR13522
+  StructType *Struct = StructType::create(C, "FooBar");
+  EXPECT_EQ("FooBar", Struct->getName());
+  Struct->setName(Struct->getName().substr(0, 3));
+  EXPECT_EQ("Foo", Struct->getName());
+  Struct->setName("");
+  EXPECT_TRUE(Struct->getName().empty());
+  EXPECT_FALSE(Struct->hasName());
+}
+
+}  // end anonymous namespace