Undo the hack in r147427 and move this unittest to a better home. This

is testing the bitcode reader's functionality, not VMCore's. Add the
what is a hope sufficient build system mojo to build and run a new
unittest.

Also clean up some of the test's naming. The goal for the file should be
to unittest the Bitcode Reader, and this is just one particular test
among potentially many in the future. Also, reverse my position and
relegate the PR# to a comment, but stash the comment on the same line as
the test name so it doesn't get lost. This makes the code more
self-documenting hopefully w/o losing track of the PR number.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147431 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/Bitcode/BitReaderTest.cpp

@@ -0,0 +1,65 @@
+//===- llvm/unittest/Bitcode/BitReaderTest.cpp - Tests for BitReader ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Constants.h"
+#include "llvm/Instructions.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "gtest/gtest.h"
+
+namespace llvm {
+namespace {
+
+static Module *makeLLVMModule() {
+  Module* Mod = new Module("test-mem", getGlobalContext());
+
+  FunctionType* FuncTy =
+    FunctionType::get(Type::getVoidTy(Mod->getContext()), false);
+  Function* Func = Function::Create(FuncTy,GlobalValue::ExternalLinkage,
+                                    "func", Mod);
+
+  BasicBlock* Entry = BasicBlock::Create(Mod->getContext(), "entry", Func);
+  new UnreachableInst(Mod->getContext(), Entry);
+
+  BasicBlock* BB = BasicBlock::Create(Mod->getContext(), "bb", Func);
+  new UnreachableInst(Mod->getContext(), BB);
+
+  PointerType* Int8Ptr = Type::getInt8PtrTy(Mod->getContext());
+  new GlobalVariable(*Mod, Int8Ptr, /*isConstant=*/true,
+                     GlobalValue::ExternalLinkage,
+                     BlockAddress::get(BB), "table");
+
+  return Mod;
+}
+
+static void writeModuleToBuffer(std::vector<unsigned char> &Buffer) {
+  Module *Mod = makeLLVMModule();
+  BitstreamWriter Stream(Buffer);
+  WriteBitcodeToStream(Mod, Stream);
+}
+
+TEST(BitReaderTest, MaterializeFunctionsForBlockAddr) { // PR11677
+  std::vector<unsigned char> Mem;
+  writeModuleToBuffer(Mem);
+  StringRef Data((const char*)&Mem[0], Mem.size());
+  MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(Data, "test", false);
+  std::string errMsg;
+  Module *m = getLazyBitcodeModule(Buffer, getGlobalContext(), &errMsg);
+  PassManager passes;
+  passes.add(createVerifierPass());
+  passes.run(*m);
+}
+
+}
+}