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//===- 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/ADT/SmallString.h"
#include "llvm/Bitcode/BitstreamWriter.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
std::unique_ptr<Module> parseAssembly(const char *Assembly) {
SMDiagnostic Error;
std::unique_ptr<Module> M =
parseAssemblyString(Assembly, Error, getGlobalContext());
std::string ErrMsg;
raw_string_ostream OS(ErrMsg);
Error.print("", OS);
// A failure here means that the test itself is buggy.
if (!M)
report_fatal_error(OS.str().c_str());
return M;
}
static void writeModuleToBuffer(std::unique_ptr<Module> Mod,
SmallVectorImpl<char> &Buffer) {
raw_svector_ostream OS(Buffer);
WriteBitcodeToFile(Mod.get(), OS);
}
static std::unique_ptr<Module> getLazyModuleFromAssembly(LLVMContext &Context,
SmallString<1024> &Mem,
const char *Assembly) {
writeModuleToBuffer(parseAssembly(Assembly), Mem);
std::unique_ptr<MemoryBuffer> Buffer =
MemoryBuffer::getMemBuffer(Mem.str(), "test", false);
ErrorOr<Module *> ModuleOrErr =
getLazyBitcodeModule(std::move(Buffer), Context);
return std::unique_ptr<Module>(ModuleOrErr.get());
}
TEST(BitReaderTest, DematerializeFunctionPreservesLinkageType) {
SmallString<1024> Mem;
LLVMContext Context;
std::unique_ptr<Module> M = getLazyModuleFromAssembly(
Context, Mem, "define internal i32 @func() {\n"
"ret i32 0\n"
"}\n");
EXPECT_FALSE(verifyModule(*M, &dbgs()));
M->getFunction("func")->materialize();
EXPECT_FALSE(M->getFunction("func")->empty());
EXPECT_TRUE(M->getFunction("func")->getLinkage() ==
GlobalValue::InternalLinkage);
// Check that the linkage type is preserved after dematerialization.
M->getFunction("func")->Dematerialize();
EXPECT_TRUE(M->getFunction("func")->empty());
EXPECT_TRUE(M->getFunction("func")->getLinkage() ==
GlobalValue::InternalLinkage);
EXPECT_FALSE(verifyModule(*M, &dbgs()));
}
TEST(BitReaderTest, MaterializeFunctionsForBlockAddr) { // PR11677
SmallString<1024> Mem;
LLVMContext Context;
std::unique_ptr<Module> M = getLazyModuleFromAssembly(
Context, Mem, "@table = constant i8* blockaddress(@func, %bb)\n"
"define void @func() {\n"
" unreachable\n"
"bb:\n"
" unreachable\n"
"}\n");
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Try (and fail) to dematerialize @func.
M->getFunction("func")->Dematerialize();
EXPECT_FALSE(M->getFunction("func")->empty());
}
TEST(BitReaderTest, MaterializeFunctionsForBlockAddrInFunctionBefore) {
SmallString<1024> Mem;
LLVMContext Context;
std::unique_ptr<Module> M = getLazyModuleFromAssembly(
Context, Mem, "define i8* @before() {\n"
" ret i8* blockaddress(@func, %bb)\n"
"}\n"
"define void @other() {\n"
" unreachable\n"
"}\n"
"define void @func() {\n"
" unreachable\n"
"bb:\n"
" unreachable\n"
"}\n");
EXPECT_TRUE(M->getFunction("before")->empty());
EXPECT_TRUE(M->getFunction("func")->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Materialize @before, pulling in @func.
EXPECT_FALSE(M->getFunction("before")->materialize());
EXPECT_FALSE(M->getFunction("func")->empty());
EXPECT_TRUE(M->getFunction("other")->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Try (and fail) to dematerialize @func.
M->getFunction("func")->Dematerialize();
EXPECT_FALSE(M->getFunction("func")->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
}
TEST(BitReaderTest, MaterializeFunctionsForBlockAddrInFunctionAfter) {
SmallString<1024> Mem;
LLVMContext Context;
std::unique_ptr<Module> M = getLazyModuleFromAssembly(
Context, Mem, "define void @func() {\n"
" unreachable\n"
"bb:\n"
" unreachable\n"
"}\n"
"define void @other() {\n"
" unreachable\n"
"}\n"
"define i8* @after() {\n"
" ret i8* blockaddress(@func, %bb)\n"
"}\n");
EXPECT_TRUE(M->getFunction("after")->empty());
EXPECT_TRUE(M->getFunction("func")->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Materialize @after, pulling in @func.
EXPECT_FALSE(M->getFunction("after")->materialize());
EXPECT_FALSE(M->getFunction("func")->empty());
EXPECT_TRUE(M->getFunction("other")->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Try (and fail) to dematerialize @func.
M->getFunction("func")->Dematerialize();
EXPECT_FALSE(M->getFunction("func")->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
}
} // end namespace
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