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405 lines
14 KiB
C++
405 lines
14 KiB
C++
//===- OperationsTest.cpp - Tests for fuzzer operations -------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/FuzzMutate/Operations.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/FuzzMutate/OpDescriptor.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/Support/SourceMgr.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include <iostream>
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// Define some pretty printers to help with debugging failures.
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namespace llvm {
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void PrintTo(Type *T, ::std::ostream *OS) {
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raw_os_ostream ROS(*OS);
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T->print(ROS);
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}
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void PrintTo(BasicBlock *BB, ::std::ostream *OS) {
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raw_os_ostream ROS(*OS);
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ROS << BB << " (" << BB->getName() << ")";
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}
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void PrintTo(Value *V, ::std::ostream *OS) {
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raw_os_ostream ROS(*OS);
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ROS << V << " (";
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V->print(ROS);
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ROS << ")";
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}
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void PrintTo(Constant *C, ::std::ostream *OS) { PrintTo(cast<Value>(C), OS); }
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} // namespace llvm
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using namespace llvm;
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using testing::AllOf;
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using testing::AnyOf;
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using testing::ElementsAre;
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using testing::Eq;
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using testing::Ge;
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using testing::Each;
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using testing::Truly;
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using testing::NotNull;
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using testing::PrintToString;
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using testing::SizeIs;
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namespace {
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std::unique_ptr<Module> parseAssembly(
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const char *Assembly, LLVMContext &Context) {
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SMDiagnostic Error;
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std::unique_ptr<Module> M = parseAssemblyString(Assembly, Error, Context);
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std::string ErrMsg;
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raw_string_ostream OS(ErrMsg);
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Error.print("", OS);
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assert(M && !verifyModule(*M, &errs()));
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return M;
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}
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MATCHER_P(TypesMatch, V, "has type " + PrintToString(V->getType())) {
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return arg->getType() == V->getType();
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}
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MATCHER_P(HasType, T, "") { return arg->getType() == T; }
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TEST(OperationsTest, SourcePreds) {
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using namespace llvm::fuzzerop;
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LLVMContext Ctx;
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Constant *i1 = ConstantInt::getFalse(Ctx);
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Constant *i8 = ConstantInt::get(Type::getInt8Ty(Ctx), 3);
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Constant *i16 = ConstantInt::get(Type::getInt16Ty(Ctx), 1 << 15);
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Constant *i32 = ConstantInt::get(Type::getInt32Ty(Ctx), 0);
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Constant *i64 = ConstantInt::get(Type::getInt64Ty(Ctx),
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std::numeric_limits<uint64_t>::max());
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Constant *f16 = ConstantFP::getInfinity(Type::getHalfTy(Ctx));
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Constant *f32 = ConstantFP::get(Type::getFloatTy(Ctx), 0.0);
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Constant *f64 = ConstantFP::get(Type::getDoubleTy(Ctx), 123.45);
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Constant *s =
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ConstantStruct::get(StructType::create(Ctx, "OpaqueStruct"));
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Constant *a =
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ConstantArray::get(ArrayType::get(i32->getType(), 2), {i32, i32});
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Constant *v8i8 = ConstantVector::getSplat(8, i8);
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Constant *v4f16 = ConstantVector::getSplat(4, f16);
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Constant *p0i32 =
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ConstantPointerNull::get(PointerType::get(i32->getType(), 0));
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auto OnlyI32 = onlyType(i32->getType());
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EXPECT_TRUE(OnlyI32.matches({}, i32));
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EXPECT_FALSE(OnlyI32.matches({}, i64));
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EXPECT_FALSE(OnlyI32.matches({}, p0i32));
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EXPECT_FALSE(OnlyI32.matches({}, a));
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EXPECT_THAT(OnlyI32.generate({}, {}),
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AllOf(SizeIs(Ge(1u)), Each(TypesMatch(i32))));
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auto AnyType = anyType();
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EXPECT_TRUE(AnyType.matches({}, i1));
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EXPECT_TRUE(AnyType.matches({}, f64));
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EXPECT_TRUE(AnyType.matches({}, s));
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EXPECT_TRUE(AnyType.matches({}, v8i8));
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EXPECT_TRUE(AnyType.matches({}, p0i32));
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EXPECT_THAT(
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AnyType.generate({}, {i32->getType(), f16->getType(), v8i8->getType()}),
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Each(AnyOf(TypesMatch(i32), TypesMatch(f16), TypesMatch(v8i8))));
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auto AnyInt = anyIntType();
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EXPECT_TRUE(AnyInt.matches({}, i1));
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EXPECT_TRUE(AnyInt.matches({}, i64));
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EXPECT_FALSE(AnyInt.matches({}, f32));
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EXPECT_FALSE(AnyInt.matches({}, v4f16));
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EXPECT_THAT(
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AnyInt.generate({}, {i32->getType(), f16->getType(), v8i8->getType()}),
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AllOf(SizeIs(Ge(1u)), Each(TypesMatch(i32))));
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auto AnyFP = anyFloatType();
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EXPECT_TRUE(AnyFP.matches({}, f16));
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EXPECT_TRUE(AnyFP.matches({}, f32));
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EXPECT_FALSE(AnyFP.matches({}, i16));
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EXPECT_FALSE(AnyFP.matches({}, p0i32));
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EXPECT_FALSE(AnyFP.matches({}, v4f16));
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EXPECT_THAT(
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AnyFP.generate({}, {i32->getType(), f16->getType(), v8i8->getType()}),
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AllOf(SizeIs(Ge(1u)), Each(TypesMatch(f16))));
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auto AnyPtr = anyPtrType();
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EXPECT_TRUE(AnyPtr.matches({}, p0i32));
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EXPECT_FALSE(AnyPtr.matches({}, i8));
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EXPECT_FALSE(AnyPtr.matches({}, a));
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EXPECT_FALSE(AnyPtr.matches({}, v8i8));
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auto isPointer = [](Value *V) { return V->getType()->isPointerTy(); };
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EXPECT_THAT(
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AnyPtr.generate({}, {i32->getType(), f16->getType(), v8i8->getType()}),
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AllOf(SizeIs(Ge(3u)), Each(Truly(isPointer))));
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auto AnyVec = anyVectorType();
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EXPECT_TRUE(AnyVec.matches({}, v8i8));
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EXPECT_TRUE(AnyVec.matches({}, v4f16));
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EXPECT_FALSE(AnyVec.matches({}, i8));
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EXPECT_FALSE(AnyVec.matches({}, a));
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EXPECT_FALSE(AnyVec.matches({}, s));
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EXPECT_THAT(AnyVec.generate({}, {v8i8->getType()}),
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ElementsAre(TypesMatch(v8i8)));
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auto First = matchFirstType();
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EXPECT_TRUE(First.matches({i8}, i8));
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EXPECT_TRUE(First.matches({s, a}, s));
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EXPECT_FALSE(First.matches({f16}, f32));
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EXPECT_FALSE(First.matches({v4f16, f64}, f64));
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EXPECT_THAT(First.generate({i8}, {}), Each(TypesMatch(i8)));
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EXPECT_THAT(First.generate({f16}, {i8->getType()}),
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Each(TypesMatch(f16)));
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EXPECT_THAT(First.generate({v8i8, i32}, {}), Each(TypesMatch(v8i8)));
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}
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TEST(OperationsTest, SplitBlock) {
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LLVMContext Ctx;
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Module M("M", Ctx);
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Function *F = Function::Create(FunctionType::get(Type::getVoidTy(Ctx), {},
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/*isVarArg=*/false),
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GlobalValue::ExternalLinkage, "f", &M);
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auto SBOp = fuzzerop::splitBlockDescriptor(1);
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// Create a block with only a return and split it on the return.
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auto *BB = BasicBlock::Create(Ctx, "BB", F);
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auto *RI = ReturnInst::Create(Ctx, BB);
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SBOp.BuilderFunc({UndefValue::get(Type::getInt1Ty(Ctx))}, RI);
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// We should end up with an unconditional branch from BB to BB1, and the
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// return ends up in BB1.
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auto *UncondBr = cast<BranchInst>(BB->getTerminator());
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ASSERT_TRUE(UncondBr->isUnconditional());
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auto *BB1 = UncondBr->getSuccessor(0);
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ASSERT_THAT(RI->getParent(), Eq(BB1));
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// Now add an instruction to BB1 and split on that.
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auto *AI = new AllocaInst(Type::getInt8Ty(Ctx), 0, "a", RI);
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Value *Cond = ConstantInt::getFalse(Ctx);
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SBOp.BuilderFunc({Cond}, AI);
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// We should end up with a loop back on BB1 and the instruction we split on
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// moves to BB2.
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auto *CondBr = cast<BranchInst>(BB1->getTerminator());
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EXPECT_THAT(CondBr->getCondition(), Eq(Cond));
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ASSERT_THAT(CondBr->getNumSuccessors(), Eq(2u));
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ASSERT_THAT(CondBr->getSuccessor(0), Eq(BB1));
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auto *BB2 = CondBr->getSuccessor(1);
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EXPECT_THAT(AI->getParent(), Eq(BB2));
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EXPECT_THAT(RI->getParent(), Eq(BB2));
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EXPECT_FALSE(verifyModule(M, &errs()));
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}
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TEST(OperationsTest, SplitEHBlock) {
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// Check that we will not try to branch back to the landingpad block using
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// regular branch instruction
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LLVMContext Ctx;
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const char *SourceCode =
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"declare i32* @f()"
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"declare i32 @personality_function()"
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"define i32* @test() personality i32 ()* @personality_function {\n"
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"entry:\n"
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" %val = invoke i32* @f()\n"
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" to label %normal unwind label %exceptional\n"
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"normal:\n"
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" ret i32* %val\n"
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"exceptional:\n"
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" %landing_pad4 = landingpad token cleanup\n"
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" ret i32* undef\n"
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"}";
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auto M = parseAssembly(SourceCode, Ctx);
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// Get the landingpad block
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BasicBlock &BB = *std::next(M->getFunction("test")->begin(), 2);
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fuzzerop::OpDescriptor Descr = fuzzerop::splitBlockDescriptor(1);
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Descr.BuilderFunc({ConstantInt::getTrue(Ctx)},&*BB.getFirstInsertionPt());
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ASSERT_TRUE(!verifyModule(*M, &errs()));
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}
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TEST(OperationsTest, SplitBlockWithPhis) {
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LLVMContext Ctx;
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Type *Int8Ty = Type::getInt8Ty(Ctx);
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Module M("M", Ctx);
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Function *F = Function::Create(FunctionType::get(Type::getVoidTy(Ctx), {},
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/*isVarArg=*/false),
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GlobalValue::ExternalLinkage, "f", &M);
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auto SBOp = fuzzerop::splitBlockDescriptor(1);
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// Create 3 blocks with an if-then branch.
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auto *BB1 = BasicBlock::Create(Ctx, "BB1", F);
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auto *BB2 = BasicBlock::Create(Ctx, "BB2", F);
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auto *BB3 = BasicBlock::Create(Ctx, "BB3", F);
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BranchInst::Create(BB2, BB3, ConstantInt::getFalse(Ctx), BB1);
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BranchInst::Create(BB3, BB2);
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// Set up phi nodes selecting values for the incoming edges.
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auto *PHI1 = PHINode::Create(Int8Ty, /*NumReservedValues=*/2, "p1", BB3);
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PHI1->addIncoming(ConstantInt::get(Int8Ty, 0), BB1);
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PHI1->addIncoming(ConstantInt::get(Int8Ty, 1), BB2);
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auto *PHI2 = PHINode::Create(Int8Ty, /*NumReservedValues=*/2, "p2", BB3);
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PHI2->addIncoming(ConstantInt::get(Int8Ty, 1), BB1);
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PHI2->addIncoming(ConstantInt::get(Int8Ty, 0), BB2);
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auto *RI = ReturnInst::Create(Ctx, BB3);
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// Now we split the block with PHI nodes, making sure they're all updated.
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Value *Cond = ConstantInt::getFalse(Ctx);
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SBOp.BuilderFunc({Cond}, RI);
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// Make sure the PHIs are updated with a value for the third incoming edge.
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EXPECT_THAT(PHI1->getNumIncomingValues(), Eq(3u));
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EXPECT_THAT(PHI2->getNumIncomingValues(), Eq(3u));
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EXPECT_FALSE(verifyModule(M, &errs()));
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}
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TEST(OperationsTest, GEP) {
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LLVMContext Ctx;
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Type *Int8PtrTy = Type::getInt8PtrTy(Ctx);
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Type *Int32Ty = Type::getInt32Ty(Ctx);
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Module M("M", Ctx);
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Function *F = Function::Create(FunctionType::get(Type::getVoidTy(Ctx), {},
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/*isVarArg=*/false),
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GlobalValue::ExternalLinkage, "f", &M);
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auto *BB = BasicBlock::Create(Ctx, "BB", F);
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auto *RI = ReturnInst::Create(Ctx, BB);
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auto GEPOp = fuzzerop::gepDescriptor(1);
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EXPECT_TRUE(GEPOp.SourcePreds[0].matches({}, UndefValue::get(Int8PtrTy)));
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EXPECT_TRUE(GEPOp.SourcePreds[1].matches({UndefValue::get(Int8PtrTy)},
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ConstantInt::get(Int32Ty, 0)));
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GEPOp.BuilderFunc({UndefValue::get(Int8PtrTy), ConstantInt::get(Int32Ty, 0)},
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RI);
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EXPECT_FALSE(verifyModule(M, &errs()));
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}
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TEST(OperationsTest, GEPPointerOperand) {
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// Check that we only pick sized pointers for the GEP instructions
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LLVMContext Ctx;
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const char *SourceCode =
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"declare void @f()\n"
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"define void @test() {\n"
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" %v = bitcast void ()* @f to i64 (i8 addrspace(4)*)*\n"
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" %a = alloca i64, i32 10\n"
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" ret void\n"
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"}";
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auto M = parseAssembly(SourceCode, Ctx);
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fuzzerop::OpDescriptor Descr = fuzzerop::gepDescriptor(1);
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// Get first basic block of the test function
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Function &F = *M->getFunction("test");
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BasicBlock &BB = *F.begin();
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// Don't match %v
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ASSERT_FALSE(Descr.SourcePreds[0].matches({}, &*BB.begin()));
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// Match %a
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ASSERT_TRUE(Descr.SourcePreds[0].matches({}, &*std::next(BB.begin())));
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}
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TEST(OperationsTest, ExtractAndInsertValue) {
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LLVMContext Ctx;
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Type *Int8PtrTy = Type::getInt8PtrTy(Ctx);
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Type *Int32Ty = Type::getInt32Ty(Ctx);
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Type *Int64Ty = Type::getInt64Ty(Ctx);
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Type *StructTy = StructType::create(Ctx, {Int8PtrTy, Int32Ty});
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Type *OpaqueTy = StructType::create(Ctx, "OpaqueStruct");
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Type *ZeroSizedArrayTy = ArrayType::get(Int64Ty, 0);
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Type *ArrayTy = ArrayType::get(Int64Ty, 4);
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Type *VectorTy = VectorType::get(Int32Ty, 2);
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auto EVOp = fuzzerop::extractValueDescriptor(1);
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auto IVOp = fuzzerop::insertValueDescriptor(1);
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// Sanity check the source preds.
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Constant *SVal = UndefValue::get(StructTy);
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Constant *OVal = UndefValue::get(OpaqueTy);
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Constant *AVal = UndefValue::get(ArrayTy);
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Constant *ZAVal = UndefValue::get(ZeroSizedArrayTy);
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Constant *VVal = UndefValue::get(VectorTy);
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EXPECT_TRUE(EVOp.SourcePreds[0].matches({}, SVal));
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EXPECT_FALSE(EVOp.SourcePreds[0].matches({}, OVal));
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EXPECT_TRUE(EVOp.SourcePreds[0].matches({}, AVal));
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EXPECT_FALSE(EVOp.SourcePreds[0].matches({}, VVal));
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EXPECT_TRUE(IVOp.SourcePreds[0].matches({}, SVal));
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EXPECT_FALSE(IVOp.SourcePreds[0].matches({}, OVal));
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EXPECT_TRUE(IVOp.SourcePreds[0].matches({}, AVal));
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EXPECT_FALSE(IVOp.SourcePreds[0].matches({}, VVal));
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// Don't consider zero sized arrays as viable sources
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EXPECT_FALSE(EVOp.SourcePreds[0].matches({}, ZAVal));
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EXPECT_FALSE(IVOp.SourcePreds[0].matches({}, ZAVal));
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// Make sure we're range checking appropriately.
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EXPECT_TRUE(
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EVOp.SourcePreds[1].matches({SVal}, ConstantInt::get(Int32Ty, 0)));
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EXPECT_TRUE(
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EVOp.SourcePreds[1].matches({SVal}, ConstantInt::get(Int32Ty, 1)));
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EXPECT_FALSE(
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EVOp.SourcePreds[1].matches({SVal}, ConstantInt::get(Int32Ty, 2)));
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EXPECT_FALSE(
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EVOp.SourcePreds[1].matches({OVal}, ConstantInt::get(Int32Ty, 0)));
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EXPECT_FALSE(
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EVOp.SourcePreds[1].matches({OVal}, ConstantInt::get(Int32Ty, 65536)));
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EXPECT_TRUE(
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EVOp.SourcePreds[1].matches({AVal}, ConstantInt::get(Int32Ty, 0)));
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EXPECT_TRUE(
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EVOp.SourcePreds[1].matches({AVal}, ConstantInt::get(Int32Ty, 3)));
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EXPECT_FALSE(
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EVOp.SourcePreds[1].matches({AVal}, ConstantInt::get(Int32Ty, 4)));
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EXPECT_THAT(
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EVOp.SourcePreds[1].generate({SVal}, {}),
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ElementsAre(ConstantInt::get(Int32Ty, 0), ConstantInt::get(Int32Ty, 1)));
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// InsertValue should accept any type in the struct, but only in positions
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// where it makes sense.
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EXPECT_TRUE(IVOp.SourcePreds[1].matches({SVal}, UndefValue::get(Int8PtrTy)));
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EXPECT_TRUE(IVOp.SourcePreds[1].matches({SVal}, UndefValue::get(Int32Ty)));
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EXPECT_FALSE(IVOp.SourcePreds[1].matches({SVal}, UndefValue::get(Int64Ty)));
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EXPECT_FALSE(IVOp.SourcePreds[2].matches({SVal, UndefValue::get(Int32Ty)},
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ConstantInt::get(Int32Ty, 0)));
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EXPECT_TRUE(IVOp.SourcePreds[2].matches({SVal, UndefValue::get(Int32Ty)},
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ConstantInt::get(Int32Ty, 1)));
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EXPECT_THAT(IVOp.SourcePreds[1].generate({SVal}, {}),
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Each(AnyOf(HasType(Int32Ty), HasType(Int8PtrTy))));
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EXPECT_THAT(
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IVOp.SourcePreds[2].generate({SVal, ConstantInt::get(Int32Ty, 0)}, {}),
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ElementsAre(ConstantInt::get(Int32Ty, 1)));
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}
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}
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