2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
276 lines
10 KiB
C++
276 lines
10 KiB
C++
//===- MachineInstrTest.cpp -----------------------------------------------===//
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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/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/TargetFrameLowering.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include "llvm/CodeGen/TargetLowering.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/IR/ModuleSlotTracker.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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// Add a few Bogus backend classes so we can create MachineInstrs without
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// depending on a real target.
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class BogusTargetLowering : public TargetLowering {
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public:
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BogusTargetLowering(TargetMachine &TM) : TargetLowering(TM) {}
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};
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class BogusFrameLowering : public TargetFrameLowering {
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public:
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BogusFrameLowering()
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: TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 4, 4) {}
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void emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const override {}
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void emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const override {}
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bool hasFP(const MachineFunction &MF) const override { return false; }
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};
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class BogusSubtarget : public TargetSubtargetInfo {
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public:
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BogusSubtarget(TargetMachine &TM)
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: TargetSubtargetInfo(Triple(""), "", "", {}, {}, nullptr, nullptr,
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nullptr, nullptr, nullptr, nullptr, nullptr),
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FL(), TL(TM) {}
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~BogusSubtarget() override {}
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const TargetFrameLowering *getFrameLowering() const override { return &FL; }
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const TargetLowering *getTargetLowering() const override { return &TL; }
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const TargetInstrInfo *getInstrInfo() const override { return &TII; }
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private:
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BogusFrameLowering FL;
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BogusTargetLowering TL;
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TargetInstrInfo TII;
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};
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class BogusTargetMachine : public LLVMTargetMachine {
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public:
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BogusTargetMachine()
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: LLVMTargetMachine(Target(), "", Triple(""), "", "", TargetOptions(),
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Reloc::Static, CodeModel::Small, CodeGenOpt::Default),
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ST(*this) {}
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~BogusTargetMachine() override {}
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const TargetSubtargetInfo *getSubtargetImpl(const Function &) const override {
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return &ST;
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}
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private:
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BogusSubtarget ST;
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};
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std::unique_ptr<BogusTargetMachine> createTargetMachine() {
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return llvm::make_unique<BogusTargetMachine>();
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}
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std::unique_ptr<MachineFunction> createMachineFunction() {
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LLVMContext Ctx;
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Module M("Module", Ctx);
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auto Type = FunctionType::get(Type::getVoidTy(Ctx), false);
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auto F = Function::Create(Type, GlobalValue::ExternalLinkage, "Test", &M);
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auto TM = createTargetMachine();
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unsigned FunctionNum = 42;
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MachineModuleInfo MMI(TM.get());
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const TargetSubtargetInfo &STI = *TM->getSubtargetImpl(*F);
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return llvm::make_unique<MachineFunction>(*F, *TM, STI, FunctionNum, MMI);
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}
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// This test makes sure that MachineInstr::isIdenticalTo handles Defs correctly
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// for various combinations of IgnoreDefs, and also that it is symmetrical.
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TEST(IsIdenticalToTest, DifferentDefs) {
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auto MF = createMachineFunction();
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unsigned short NumOps = 2;
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unsigned char NumDefs = 1;
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MCOperandInfo OpInfo[] = {
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{0, 0, MCOI::OPERAND_REGISTER, 0},
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{0, 1 << MCOI::OptionalDef, MCOI::OPERAND_REGISTER, 0}};
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MCInstrDesc MCID = {
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0, NumOps, NumDefs, 0, 0, 1ULL << MCID::HasOptionalDef,
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0, nullptr, nullptr, OpInfo, 0, nullptr};
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// Create two MIs with different virtual reg defs and the same uses.
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unsigned VirtualDef1 = -42; // The value doesn't matter, but the sign does.
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unsigned VirtualDef2 = -43;
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unsigned VirtualUse = -44;
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auto MI1 = MF->CreateMachineInstr(MCID, DebugLoc());
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MI1->addOperand(*MF, MachineOperand::CreateReg(VirtualDef1, /*isDef*/ true));
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MI1->addOperand(*MF, MachineOperand::CreateReg(VirtualUse, /*isDef*/ false));
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auto MI2 = MF->CreateMachineInstr(MCID, DebugLoc());
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MI2->addOperand(*MF, MachineOperand::CreateReg(VirtualDef2, /*isDef*/ true));
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MI2->addOperand(*MF, MachineOperand::CreateReg(VirtualUse, /*isDef*/ false));
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// Check that they are identical when we ignore virtual register defs, but not
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// when we check defs.
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ASSERT_FALSE(MI1->isIdenticalTo(*MI2, MachineInstr::CheckDefs));
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ASSERT_FALSE(MI2->isIdenticalTo(*MI1, MachineInstr::CheckDefs));
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ASSERT_TRUE(MI1->isIdenticalTo(*MI2, MachineInstr::IgnoreVRegDefs));
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ASSERT_TRUE(MI2->isIdenticalTo(*MI1, MachineInstr::IgnoreVRegDefs));
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// Create two MIs with different virtual reg defs, and a def or use of a
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// sentinel register.
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unsigned SentinelReg = 0;
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auto MI3 = MF->CreateMachineInstr(MCID, DebugLoc());
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MI3->addOperand(*MF, MachineOperand::CreateReg(VirtualDef1, /*isDef*/ true));
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MI3->addOperand(*MF, MachineOperand::CreateReg(SentinelReg, /*isDef*/ true));
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auto MI4 = MF->CreateMachineInstr(MCID, DebugLoc());
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MI4->addOperand(*MF, MachineOperand::CreateReg(VirtualDef2, /*isDef*/ true));
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MI4->addOperand(*MF, MachineOperand::CreateReg(SentinelReg, /*isDef*/ false));
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// Check that they are never identical.
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ASSERT_FALSE(MI3->isIdenticalTo(*MI4, MachineInstr::CheckDefs));
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ASSERT_FALSE(MI4->isIdenticalTo(*MI3, MachineInstr::CheckDefs));
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ASSERT_FALSE(MI3->isIdenticalTo(*MI4, MachineInstr::IgnoreVRegDefs));
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ASSERT_FALSE(MI4->isIdenticalTo(*MI3, MachineInstr::IgnoreVRegDefs));
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}
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// Check that MachineInstrExpressionTrait::isEqual is symmetric and in sync with
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// MachineInstrExpressionTrait::getHashValue
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void checkHashAndIsEqualMatch(MachineInstr *MI1, MachineInstr *MI2) {
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bool IsEqual1 = MachineInstrExpressionTrait::isEqual(MI1, MI2);
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bool IsEqual2 = MachineInstrExpressionTrait::isEqual(MI2, MI1);
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ASSERT_EQ(IsEqual1, IsEqual2);
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auto Hash1 = MachineInstrExpressionTrait::getHashValue(MI1);
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auto Hash2 = MachineInstrExpressionTrait::getHashValue(MI2);
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ASSERT_EQ(IsEqual1, Hash1 == Hash2);
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}
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// This test makes sure that MachineInstrExpressionTraits::isEqual is in sync
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// with MachineInstrExpressionTraits::getHashValue.
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TEST(MachineInstrExpressionTraitTest, IsEqualAgreesWithGetHashValue) {
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auto MF = createMachineFunction();
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unsigned short NumOps = 2;
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unsigned char NumDefs = 1;
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MCOperandInfo OpInfo[] = {
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{0, 0, MCOI::OPERAND_REGISTER, 0},
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{0, 1 << MCOI::OptionalDef, MCOI::OPERAND_REGISTER, 0}};
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MCInstrDesc MCID = {
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0, NumOps, NumDefs, 0, 0, 1ULL << MCID::HasOptionalDef,
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0, nullptr, nullptr, OpInfo, 0, nullptr};
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// Define a series of instructions with different kinds of operands and make
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// sure that the hash function is consistent with isEqual for various
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// combinations of them.
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unsigned VirtualDef1 = -42;
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unsigned VirtualDef2 = -43;
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unsigned VirtualReg = -44;
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unsigned SentinelReg = 0;
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unsigned PhysicalReg = 45;
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auto VD1VU = MF->CreateMachineInstr(MCID, DebugLoc());
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VD1VU->addOperand(*MF,
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MachineOperand::CreateReg(VirtualDef1, /*isDef*/ true));
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VD1VU->addOperand(*MF,
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MachineOperand::CreateReg(VirtualReg, /*isDef*/ false));
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auto VD2VU = MF->CreateMachineInstr(MCID, DebugLoc());
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VD2VU->addOperand(*MF,
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MachineOperand::CreateReg(VirtualDef2, /*isDef*/ true));
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VD2VU->addOperand(*MF,
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MachineOperand::CreateReg(VirtualReg, /*isDef*/ false));
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auto VD1SU = MF->CreateMachineInstr(MCID, DebugLoc());
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VD1SU->addOperand(*MF,
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MachineOperand::CreateReg(VirtualDef1, /*isDef*/ true));
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VD1SU->addOperand(*MF,
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MachineOperand::CreateReg(SentinelReg, /*isDef*/ false));
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auto VD1SD = MF->CreateMachineInstr(MCID, DebugLoc());
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VD1SD->addOperand(*MF,
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MachineOperand::CreateReg(VirtualDef1, /*isDef*/ true));
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VD1SD->addOperand(*MF,
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MachineOperand::CreateReg(SentinelReg, /*isDef*/ true));
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auto VD2PU = MF->CreateMachineInstr(MCID, DebugLoc());
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VD2PU->addOperand(*MF,
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MachineOperand::CreateReg(VirtualDef2, /*isDef*/ true));
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VD2PU->addOperand(*MF,
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MachineOperand::CreateReg(PhysicalReg, /*isDef*/ false));
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auto VD2PD = MF->CreateMachineInstr(MCID, DebugLoc());
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VD2PD->addOperand(*MF,
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MachineOperand::CreateReg(VirtualDef2, /*isDef*/ true));
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VD2PD->addOperand(*MF,
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MachineOperand::CreateReg(PhysicalReg, /*isDef*/ true));
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checkHashAndIsEqualMatch(VD1VU, VD2VU);
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checkHashAndIsEqualMatch(VD1VU, VD1SU);
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checkHashAndIsEqualMatch(VD1VU, VD1SD);
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checkHashAndIsEqualMatch(VD1VU, VD2PU);
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checkHashAndIsEqualMatch(VD1VU, VD2PD);
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checkHashAndIsEqualMatch(VD2VU, VD1SU);
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checkHashAndIsEqualMatch(VD2VU, VD1SD);
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checkHashAndIsEqualMatch(VD2VU, VD2PU);
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checkHashAndIsEqualMatch(VD2VU, VD2PD);
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checkHashAndIsEqualMatch(VD1SU, VD1SD);
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checkHashAndIsEqualMatch(VD1SU, VD2PU);
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checkHashAndIsEqualMatch(VD1SU, VD2PD);
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checkHashAndIsEqualMatch(VD1SD, VD2PU);
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checkHashAndIsEqualMatch(VD1SD, VD2PD);
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checkHashAndIsEqualMatch(VD2PU, VD2PD);
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}
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TEST(MachineInstrPrintingTest, DebugLocPrinting) {
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auto MF = createMachineFunction();
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MCOperandInfo OpInfo{0, 0, MCOI::OPERAND_REGISTER, 0};
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MCInstrDesc MCID = {0, 1, 1, 0, 0, 0,
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0, nullptr, nullptr, &OpInfo, 0, nullptr};
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LLVMContext Ctx;
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DIFile *DIF = DIFile::getDistinct(Ctx, "filename", "");
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DISubprogram *DIS = DISubprogram::getDistinct(
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Ctx, nullptr, "", "", DIF, 0, nullptr, 0, nullptr, 0, 0, DINode::FlagZero,
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DISubprogram::SPFlagZero, nullptr);
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DILocation *DIL = DILocation::get(Ctx, 1, 5, DIS);
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DebugLoc DL(DIL);
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MachineInstr *MI = MF->CreateMachineInstr(MCID, DL);
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MI->addOperand(*MF, MachineOperand::CreateReg(0, /*isDef*/ true));
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std::string str;
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raw_string_ostream OS(str);
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MI->print(OS);
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ASSERT_TRUE(
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StringRef(OS.str()).startswith("$noreg = UNKNOWN debug-location "));
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ASSERT_TRUE(
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StringRef(OS.str()).endswith("filename:1:5"));
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}
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} // end namespace
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