BitReaderTest.cpp
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//===- llvm/unittest/Bitcode/BitReaderTest.cpp - Tests for BitReader ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
std::unique_ptr<Module> parseAssembly(LLVMContext &Context,
const char *Assembly) {
SMDiagnostic Error;
std::unique_ptr<Module> M = parseAssemblyString(Assembly, Error, Context);
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, OS);
}
static std::unique_ptr<Module> getLazyModuleFromAssembly(LLVMContext &Context,
SmallString<1024> &Mem,
const char *Assembly) {
writeModuleToBuffer(parseAssembly(Context, Assembly), Mem);
Expected<std::unique_ptr<Module>> ModuleOrErr =
getLazyBitcodeModule(MemoryBufferRef(Mem.str(), "test"), Context);
if (!ModuleOrErr)
report_fatal_error("Could not parse bitcode module");
return std::move(ModuleOrErr.get());
}
// Tests that lazy evaluation can parse functions out of order.
TEST(BitReaderTest, MaterializeFunctionsOutOfOrder) {
SmallString<1024> Mem;
LLVMContext Context;
std::unique_ptr<Module> M = getLazyModuleFromAssembly(
Context, Mem, "define void @f() {\n"
" unreachable\n"
"}\n"
"define void @g() {\n"
" unreachable\n"
"}\n"
"define void @h() {\n"
" unreachable\n"
"}\n"
"define void @j() {\n"
" unreachable\n"
"}\n");
EXPECT_FALSE(verifyModule(*M, &dbgs()));
Function *F = M->getFunction("f");
Function *G = M->getFunction("g");
Function *H = M->getFunction("h");
Function *J = M->getFunction("j");
// Initially all functions are not materialized (no basic blocks).
EXPECT_TRUE(F->empty());
EXPECT_TRUE(G->empty());
EXPECT_TRUE(H->empty());
EXPECT_TRUE(J->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Materialize h.
ASSERT_FALSE(H->materialize());
EXPECT_TRUE(F->empty());
EXPECT_TRUE(G->empty());
EXPECT_FALSE(H->empty());
EXPECT_TRUE(J->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Materialize g.
ASSERT_FALSE(G->materialize());
EXPECT_TRUE(F->empty());
EXPECT_FALSE(G->empty());
EXPECT_FALSE(H->empty());
EXPECT_TRUE(J->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Materialize j.
ASSERT_FALSE(J->materialize());
EXPECT_TRUE(F->empty());
EXPECT_FALSE(G->empty());
EXPECT_FALSE(H->empty());
EXPECT_FALSE(J->empty());
EXPECT_FALSE(verifyModule(*M, &dbgs()));
// Materialize f.
ASSERT_FALSE(F->materialize());
EXPECT_FALSE(F->empty());
EXPECT_FALSE(G->empty());
EXPECT_FALSE(H->empty());
EXPECT_FALSE(J->empty());
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()));
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()));
}
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()));
}
} // end namespace