| //===-- llvm/CodeGen/GlobalISel/IRTranslator.cpp - IRTranslator --*- C++ -*-==// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| /// \file |
| /// This file implements the IRTranslator class. |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/CodeGen/GlobalISel/IRTranslator.h" |
| |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/CodeGen/GlobalISel/CallLowering.h" |
| #include "llvm/CodeGen/Analysis.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/CodeGen/MachineModuleInfo.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/CodeGen/TargetPassConfig.h" |
| #include "llvm/IR/Constant.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/IR/GetElementPtrTypeIterator.h" |
| #include "llvm/IR/IntrinsicInst.h" |
| #include "llvm/IR/Type.h" |
| #include "llvm/IR/Value.h" |
| #include "llvm/Target/TargetIntrinsicInfo.h" |
| #include "llvm/Target/TargetLowering.h" |
| |
| #define DEBUG_TYPE "irtranslator" |
| |
| using namespace llvm; |
| |
| char IRTranslator::ID = 0; |
| INITIALIZE_PASS_BEGIN(IRTranslator, DEBUG_TYPE, "IRTranslator LLVM IR -> MI", |
| false, false) |
| INITIALIZE_PASS_DEPENDENCY(TargetPassConfig) |
| INITIALIZE_PASS_END(IRTranslator, DEBUG_TYPE, "IRTranslator LLVM IR -> MI", |
| false, false) |
| |
| static void reportTranslationError(const Value &V, const Twine &Message) { |
| std::string ErrStorage; |
| raw_string_ostream Err(ErrStorage); |
| Err << Message << ": " << V << '\n'; |
| report_fatal_error(Err.str()); |
| } |
| |
| IRTranslator::IRTranslator() : MachineFunctionPass(ID), MRI(nullptr) { |
| initializeIRTranslatorPass(*PassRegistry::getPassRegistry()); |
| } |
| |
| void IRTranslator::getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.addRequired<TargetPassConfig>(); |
| MachineFunctionPass::getAnalysisUsage(AU); |
| } |
| |
| |
| unsigned IRTranslator::getOrCreateVReg(const Value &Val) { |
| unsigned &ValReg = ValToVReg[&Val]; |
| // Check if this is the first time we see Val. |
| if (!ValReg) { |
| // Fill ValRegsSequence with the sequence of registers |
| // we need to concat together to produce the value. |
| assert(Val.getType()->isSized() && |
| "Don't know how to create an empty vreg"); |
| unsigned VReg = MRI->createGenericVirtualRegister(LLT{*Val.getType(), *DL}); |
| ValReg = VReg; |
| |
| if (auto CV = dyn_cast<Constant>(&Val)) { |
| bool Success = translate(*CV, VReg); |
| if (!Success) { |
| if (!TPC->isGlobalISelAbortEnabled()) { |
| MF->getProperties().set( |
| MachineFunctionProperties::Property::FailedISel); |
| return VReg; |
| } |
| reportTranslationError(Val, "unable to translate constant"); |
| } |
| } |
| } |
| return ValReg; |
| } |
| |
| int IRTranslator::getOrCreateFrameIndex(const AllocaInst &AI) { |
| if (FrameIndices.find(&AI) != FrameIndices.end()) |
| return FrameIndices[&AI]; |
| |
| unsigned ElementSize = DL->getTypeStoreSize(AI.getAllocatedType()); |
| unsigned Size = |
| ElementSize * cast<ConstantInt>(AI.getArraySize())->getZExtValue(); |
| |
| // Always allocate at least one byte. |
| Size = std::max(Size, 1u); |
| |
| unsigned Alignment = AI.getAlignment(); |
| if (!Alignment) |
| Alignment = DL->getABITypeAlignment(AI.getAllocatedType()); |
| |
| int &FI = FrameIndices[&AI]; |
| FI = MF->getFrameInfo().CreateStackObject(Size, Alignment, false, &AI); |
| return FI; |
| } |
| |
| unsigned IRTranslator::getMemOpAlignment(const Instruction &I) { |
| unsigned Alignment = 0; |
| Type *ValTy = nullptr; |
| if (const StoreInst *SI = dyn_cast<StoreInst>(&I)) { |
| Alignment = SI->getAlignment(); |
| ValTy = SI->getValueOperand()->getType(); |
| } else if (const LoadInst *LI = dyn_cast<LoadInst>(&I)) { |
| Alignment = LI->getAlignment(); |
| ValTy = LI->getType(); |
| } else if (!TPC->isGlobalISelAbortEnabled()) { |
| MF->getProperties().set( |
| MachineFunctionProperties::Property::FailedISel); |
| return 1; |
| } else |
| llvm_unreachable("unhandled memory instruction"); |
| |
| return Alignment ? Alignment : DL->getABITypeAlignment(ValTy); |
| } |
| |
| MachineBasicBlock &IRTranslator::getOrCreateBB(const BasicBlock &BB) { |
| MachineBasicBlock *&MBB = BBToMBB[&BB]; |
| if (!MBB) { |
| MBB = MF->CreateMachineBasicBlock(&BB); |
| MF->push_back(MBB); |
| |
| if (BB.hasAddressTaken()) |
| MBB->setHasAddressTaken(); |
| } |
| return *MBB; |
| } |
| |
| bool IRTranslator::translateBinaryOp(unsigned Opcode, const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| // FIXME: handle signed/unsigned wrapping flags. |
| |
| // Get or create a virtual register for each value. |
| // Unless the value is a Constant => loadimm cst? |
| // or inline constant each time? |
| // Creation of a virtual register needs to have a size. |
| unsigned Op0 = getOrCreateVReg(*U.getOperand(0)); |
| unsigned Op1 = getOrCreateVReg(*U.getOperand(1)); |
| unsigned Res = getOrCreateVReg(U); |
| MIRBuilder.buildInstr(Opcode).addDef(Res).addUse(Op0).addUse(Op1); |
| return true; |
| } |
| |
| bool IRTranslator::translateCompare(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| const CmpInst *CI = dyn_cast<CmpInst>(&U); |
| unsigned Op0 = getOrCreateVReg(*U.getOperand(0)); |
| unsigned Op1 = getOrCreateVReg(*U.getOperand(1)); |
| unsigned Res = getOrCreateVReg(U); |
| CmpInst::Predicate Pred = |
| CI ? CI->getPredicate() : static_cast<CmpInst::Predicate>( |
| cast<ConstantExpr>(U).getPredicate()); |
| |
| if (CmpInst::isIntPredicate(Pred)) |
| MIRBuilder.buildICmp(Pred, Res, Op0, Op1); |
| else |
| MIRBuilder.buildFCmp(Pred, Res, Op0, Op1); |
| |
| return true; |
| } |
| |
| bool IRTranslator::translateRet(const User &U, MachineIRBuilder &MIRBuilder) { |
| const ReturnInst &RI = cast<ReturnInst>(U); |
| const Value *Ret = RI.getReturnValue(); |
| // The target may mess up with the insertion point, but |
| // this is not important as a return is the last instruction |
| // of the block anyway. |
| return CLI->lowerReturn(MIRBuilder, Ret, !Ret ? 0 : getOrCreateVReg(*Ret)); |
| } |
| |
| bool IRTranslator::translateBr(const User &U, MachineIRBuilder &MIRBuilder) { |
| const BranchInst &BrInst = cast<BranchInst>(U); |
| unsigned Succ = 0; |
| if (!BrInst.isUnconditional()) { |
| // We want a G_BRCOND to the true BB followed by an unconditional branch. |
| unsigned Tst = getOrCreateVReg(*BrInst.getCondition()); |
| const BasicBlock &TrueTgt = *cast<BasicBlock>(BrInst.getSuccessor(Succ++)); |
| MachineBasicBlock &TrueBB = getOrCreateBB(TrueTgt); |
| MIRBuilder.buildBrCond(Tst, TrueBB); |
| } |
| |
| const BasicBlock &BrTgt = *cast<BasicBlock>(BrInst.getSuccessor(Succ)); |
| MachineBasicBlock &TgtBB = getOrCreateBB(BrTgt); |
| MIRBuilder.buildBr(TgtBB); |
| |
| // Link successors. |
| MachineBasicBlock &CurBB = MIRBuilder.getMBB(); |
| for (const BasicBlock *Succ : BrInst.successors()) |
| CurBB.addSuccessor(&getOrCreateBB(*Succ)); |
| return true; |
| } |
| |
| bool IRTranslator::translateSwitch(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| // For now, just translate as a chain of conditional branches. |
| // FIXME: could we share most of the logic/code in |
| // SelectionDAGBuilder::visitSwitch between SelectionDAG and GlobalISel? |
| // At first sight, it seems most of the logic in there is independent of |
| // SelectionDAG-specifics and a lot of work went in to optimize switch |
| // lowering in there. |
| |
| const SwitchInst &SwInst = cast<SwitchInst>(U); |
| const unsigned SwCondValue = getOrCreateVReg(*SwInst.getCondition()); |
| |
| LLT LLTi1 = LLT(*Type::getInt1Ty(U.getContext()), *DL); |
| for (auto &CaseIt : SwInst.cases()) { |
| const unsigned CaseValueReg = getOrCreateVReg(*CaseIt.getCaseValue()); |
| const unsigned Tst = MRI->createGenericVirtualRegister(LLTi1); |
| MIRBuilder.buildICmp(CmpInst::ICMP_EQ, Tst, CaseValueReg, SwCondValue); |
| MachineBasicBlock &CurBB = MIRBuilder.getMBB(); |
| MachineBasicBlock &TrueBB = getOrCreateBB(*CaseIt.getCaseSuccessor()); |
| |
| MIRBuilder.buildBrCond(Tst, TrueBB); |
| CurBB.addSuccessor(&TrueBB); |
| |
| MachineBasicBlock *FalseBB = |
| MF->CreateMachineBasicBlock(SwInst.getParent()); |
| MF->push_back(FalseBB); |
| MIRBuilder.buildBr(*FalseBB); |
| CurBB.addSuccessor(FalseBB); |
| |
| MIRBuilder.setMBB(*FalseBB); |
| } |
| // handle default case |
| MachineBasicBlock &DefaultBB = getOrCreateBB(*SwInst.getDefaultDest()); |
| MIRBuilder.buildBr(DefaultBB); |
| MIRBuilder.getMBB().addSuccessor(&DefaultBB); |
| |
| return true; |
| } |
| |
| bool IRTranslator::translateLoad(const User &U, MachineIRBuilder &MIRBuilder) { |
| const LoadInst &LI = cast<LoadInst>(U); |
| |
| if (!TPC->isGlobalISelAbortEnabled() && LI.isAtomic()) |
| return false; |
| |
| assert(!LI.isAtomic() && "only non-atomic loads are supported at the moment"); |
| auto Flags = LI.isVolatile() ? MachineMemOperand::MOVolatile |
| : MachineMemOperand::MONone; |
| Flags |= MachineMemOperand::MOLoad; |
| |
| unsigned Res = getOrCreateVReg(LI); |
| unsigned Addr = getOrCreateVReg(*LI.getPointerOperand()); |
| LLT VTy{*LI.getType(), *DL}, PTy{*LI.getPointerOperand()->getType(), *DL}; |
| MIRBuilder.buildLoad( |
| Res, Addr, |
| *MF->getMachineMemOperand(MachinePointerInfo(LI.getPointerOperand()), |
| Flags, DL->getTypeStoreSize(LI.getType()), |
| getMemOpAlignment(LI))); |
| return true; |
| } |
| |
| bool IRTranslator::translateStore(const User &U, MachineIRBuilder &MIRBuilder) { |
| const StoreInst &SI = cast<StoreInst>(U); |
| |
| if (!TPC->isGlobalISelAbortEnabled() && SI.isAtomic()) |
| return false; |
| |
| assert(!SI.isAtomic() && "only non-atomic stores supported at the moment"); |
| auto Flags = SI.isVolatile() ? MachineMemOperand::MOVolatile |
| : MachineMemOperand::MONone; |
| Flags |= MachineMemOperand::MOStore; |
| |
| unsigned Val = getOrCreateVReg(*SI.getValueOperand()); |
| unsigned Addr = getOrCreateVReg(*SI.getPointerOperand()); |
| LLT VTy{*SI.getValueOperand()->getType(), *DL}, |
| PTy{*SI.getPointerOperand()->getType(), *DL}; |
| |
| MIRBuilder.buildStore( |
| Val, Addr, |
| *MF->getMachineMemOperand( |
| MachinePointerInfo(SI.getPointerOperand()), Flags, |
| DL->getTypeStoreSize(SI.getValueOperand()->getType()), |
| getMemOpAlignment(SI))); |
| return true; |
| } |
| |
| bool IRTranslator::translateExtractValue(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| const Value *Src = U.getOperand(0); |
| Type *Int32Ty = Type::getInt32Ty(U.getContext()); |
| SmallVector<Value *, 1> Indices; |
| |
| // getIndexedOffsetInType is designed for GEPs, so the first index is the |
| // usual array element rather than looking into the actual aggregate. |
| Indices.push_back(ConstantInt::get(Int32Ty, 0)); |
| |
| if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(&U)) { |
| for (auto Idx : EVI->indices()) |
| Indices.push_back(ConstantInt::get(Int32Ty, Idx)); |
| } else { |
| for (unsigned i = 1; i < U.getNumOperands(); ++i) |
| Indices.push_back(U.getOperand(i)); |
| } |
| |
| uint64_t Offset = 8 * DL->getIndexedOffsetInType(Src->getType(), Indices); |
| |
| unsigned Res = getOrCreateVReg(U); |
| MIRBuilder.buildExtract(Res, Offset, getOrCreateVReg(*Src)); |
| |
| return true; |
| } |
| |
| bool IRTranslator::translateInsertValue(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| const Value *Src = U.getOperand(0); |
| Type *Int32Ty = Type::getInt32Ty(U.getContext()); |
| SmallVector<Value *, 1> Indices; |
| |
| // getIndexedOffsetInType is designed for GEPs, so the first index is the |
| // usual array element rather than looking into the actual aggregate. |
| Indices.push_back(ConstantInt::get(Int32Ty, 0)); |
| |
| if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(&U)) { |
| for (auto Idx : IVI->indices()) |
| Indices.push_back(ConstantInt::get(Int32Ty, Idx)); |
| } else { |
| for (unsigned i = 2; i < U.getNumOperands(); ++i) |
| Indices.push_back(U.getOperand(i)); |
| } |
| |
| uint64_t Offset = 8 * DL->getIndexedOffsetInType(Src->getType(), Indices); |
| |
| unsigned Res = getOrCreateVReg(U); |
| const Value &Inserted = *U.getOperand(1); |
| MIRBuilder.buildInsert(Res, getOrCreateVReg(*Src), getOrCreateVReg(Inserted), |
| Offset); |
| |
| return true; |
| } |
| |
| bool IRTranslator::translateSelect(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| MIRBuilder.buildSelect(getOrCreateVReg(U), getOrCreateVReg(*U.getOperand(0)), |
| getOrCreateVReg(*U.getOperand(1)), |
| getOrCreateVReg(*U.getOperand(2))); |
| return true; |
| } |
| |
| bool IRTranslator::translateBitCast(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| if (LLT{*U.getOperand(0)->getType(), *DL} == LLT{*U.getType(), *DL}) { |
| unsigned &Reg = ValToVReg[&U]; |
| if (Reg) |
| MIRBuilder.buildCopy(Reg, getOrCreateVReg(*U.getOperand(0))); |
| else |
| Reg = getOrCreateVReg(*U.getOperand(0)); |
| return true; |
| } |
| return translateCast(TargetOpcode::G_BITCAST, U, MIRBuilder); |
| } |
| |
| bool IRTranslator::translateCast(unsigned Opcode, const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| unsigned Op = getOrCreateVReg(*U.getOperand(0)); |
| unsigned Res = getOrCreateVReg(U); |
| MIRBuilder.buildInstr(Opcode).addDef(Res).addUse(Op); |
| return true; |
| } |
| |
| bool IRTranslator::translateGetElementPtr(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| // FIXME: support vector GEPs. |
| if (U.getType()->isVectorTy()) |
| return false; |
| |
| Value &Op0 = *U.getOperand(0); |
| unsigned BaseReg = getOrCreateVReg(Op0); |
| LLT PtrTy{*Op0.getType(), *DL}; |
| unsigned PtrSize = DL->getPointerSizeInBits(PtrTy.getAddressSpace()); |
| LLT OffsetTy = LLT::scalar(PtrSize); |
| |
| int64_t Offset = 0; |
| for (gep_type_iterator GTI = gep_type_begin(&U), E = gep_type_end(&U); |
| GTI != E; ++GTI) { |
| const Value *Idx = GTI.getOperand(); |
| if (StructType *StTy = GTI.getStructTypeOrNull()) { |
| unsigned Field = cast<Constant>(Idx)->getUniqueInteger().getZExtValue(); |
| Offset += DL->getStructLayout(StTy)->getElementOffset(Field); |
| continue; |
| } else { |
| uint64_t ElementSize = DL->getTypeAllocSize(GTI.getIndexedType()); |
| |
| // If this is a scalar constant or a splat vector of constants, |
| // handle it quickly. |
| if (const auto *CI = dyn_cast<ConstantInt>(Idx)) { |
| Offset += ElementSize * CI->getSExtValue(); |
| continue; |
| } |
| |
| if (Offset != 0) { |
| unsigned NewBaseReg = MRI->createGenericVirtualRegister(PtrTy); |
| unsigned OffsetReg = MRI->createGenericVirtualRegister(OffsetTy); |
| MIRBuilder.buildConstant(OffsetReg, Offset); |
| MIRBuilder.buildGEP(NewBaseReg, BaseReg, OffsetReg); |
| |
| BaseReg = NewBaseReg; |
| Offset = 0; |
| } |
| |
| // N = N + Idx * ElementSize; |
| unsigned ElementSizeReg = MRI->createGenericVirtualRegister(OffsetTy); |
| MIRBuilder.buildConstant(ElementSizeReg, ElementSize); |
| |
| unsigned IdxReg = getOrCreateVReg(*Idx); |
| if (MRI->getType(IdxReg) != OffsetTy) { |
| unsigned NewIdxReg = MRI->createGenericVirtualRegister(OffsetTy); |
| MIRBuilder.buildSExtOrTrunc(NewIdxReg, IdxReg); |
| IdxReg = NewIdxReg; |
| } |
| |
| unsigned OffsetReg = MRI->createGenericVirtualRegister(OffsetTy); |
| MIRBuilder.buildMul(OffsetReg, ElementSizeReg, IdxReg); |
| |
| unsigned NewBaseReg = MRI->createGenericVirtualRegister(PtrTy); |
| MIRBuilder.buildGEP(NewBaseReg, BaseReg, OffsetReg); |
| BaseReg = NewBaseReg; |
| } |
| } |
| |
| if (Offset != 0) { |
| unsigned OffsetReg = MRI->createGenericVirtualRegister(OffsetTy); |
| MIRBuilder.buildConstant(OffsetReg, Offset); |
| MIRBuilder.buildGEP(getOrCreateVReg(U), BaseReg, OffsetReg); |
| return true; |
| } |
| |
| MIRBuilder.buildCopy(getOrCreateVReg(U), BaseReg); |
| return true; |
| } |
| |
| bool IRTranslator::translateMemcpy(const CallInst &CI, |
| MachineIRBuilder &MIRBuilder) { |
| LLT SizeTy{*CI.getArgOperand(2)->getType(), *DL}; |
| if (cast<PointerType>(CI.getArgOperand(0)->getType())->getAddressSpace() != |
| 0 || |
| cast<PointerType>(CI.getArgOperand(1)->getType())->getAddressSpace() != |
| 0 || |
| SizeTy.getSizeInBits() != DL->getPointerSizeInBits(0)) |
| return false; |
| |
| SmallVector<CallLowering::ArgInfo, 8> Args; |
| for (int i = 0; i < 3; ++i) { |
| const auto &Arg = CI.getArgOperand(i); |
| Args.emplace_back(getOrCreateVReg(*Arg), Arg->getType()); |
| } |
| |
| MachineOperand Callee = MachineOperand::CreateES("memcpy"); |
| |
| return CLI->lowerCall(MIRBuilder, Callee, |
| CallLowering::ArgInfo(0, CI.getType()), Args); |
| } |
| |
| void IRTranslator::getStackGuard(unsigned DstReg, |
| MachineIRBuilder &MIRBuilder) { |
| auto MIB = MIRBuilder.buildInstr(TargetOpcode::LOAD_STACK_GUARD); |
| MIB.addDef(DstReg); |
| |
| auto &TLI = *MF->getSubtarget().getTargetLowering(); |
| Value *Global = TLI.getSDagStackGuard(*MF->getFunction()->getParent()); |
| if (!Global) |
| return; |
| |
| MachinePointerInfo MPInfo(Global); |
| MachineInstr::mmo_iterator MemRefs = MF->allocateMemRefsArray(1); |
| auto Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant | |
| MachineMemOperand::MODereferenceable; |
| *MemRefs = |
| MF->getMachineMemOperand(MPInfo, Flags, DL->getPointerSizeInBits() / 8, |
| DL->getPointerABIAlignment()); |
| MIB.setMemRefs(MemRefs, MemRefs + 1); |
| } |
| |
| bool IRTranslator::translateOverflowIntrinsic(const CallInst &CI, unsigned Op, |
| MachineIRBuilder &MIRBuilder) { |
| LLT Ty{*CI.getOperand(0)->getType(), *DL}; |
| LLT s1 = LLT::scalar(1); |
| unsigned Width = Ty.getSizeInBits(); |
| unsigned Res = MRI->createGenericVirtualRegister(Ty); |
| unsigned Overflow = MRI->createGenericVirtualRegister(s1); |
| auto MIB = MIRBuilder.buildInstr(Op) |
| .addDef(Res) |
| .addDef(Overflow) |
| .addUse(getOrCreateVReg(*CI.getOperand(0))) |
| .addUse(getOrCreateVReg(*CI.getOperand(1))); |
| |
| if (Op == TargetOpcode::G_UADDE || Op == TargetOpcode::G_USUBE) { |
| unsigned Zero = MRI->createGenericVirtualRegister(s1); |
| EntryBuilder.buildConstant(Zero, 0); |
| MIB.addUse(Zero); |
| } |
| |
| MIRBuilder.buildSequence(getOrCreateVReg(CI), Res, 0, Overflow, Width); |
| return true; |
| } |
| |
| bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID, |
| MachineIRBuilder &MIRBuilder) { |
| switch (ID) { |
| default: |
| break; |
| case Intrinsic::dbg_declare: |
| case Intrinsic::dbg_value: |
| // FIXME: these obviously need to be supported properly. |
| MF->getProperties().set( |
| MachineFunctionProperties::Property::FailedISel); |
| return true; |
| case Intrinsic::uadd_with_overflow: |
| return translateOverflowIntrinsic(CI, TargetOpcode::G_UADDE, MIRBuilder); |
| case Intrinsic::sadd_with_overflow: |
| return translateOverflowIntrinsic(CI, TargetOpcode::G_SADDO, MIRBuilder); |
| case Intrinsic::usub_with_overflow: |
| return translateOverflowIntrinsic(CI, TargetOpcode::G_USUBE, MIRBuilder); |
| case Intrinsic::ssub_with_overflow: |
| return translateOverflowIntrinsic(CI, TargetOpcode::G_SSUBO, MIRBuilder); |
| case Intrinsic::umul_with_overflow: |
| return translateOverflowIntrinsic(CI, TargetOpcode::G_UMULO, MIRBuilder); |
| case Intrinsic::smul_with_overflow: |
| return translateOverflowIntrinsic(CI, TargetOpcode::G_SMULO, MIRBuilder); |
| case Intrinsic::memcpy: |
| return translateMemcpy(CI, MIRBuilder); |
| case Intrinsic::eh_typeid_for: { |
| GlobalValue *GV = ExtractTypeInfo(CI.getArgOperand(0)); |
| unsigned Reg = getOrCreateVReg(CI); |
| unsigned TypeID = MF->getTypeIDFor(GV); |
| MIRBuilder.buildConstant(Reg, TypeID); |
| return true; |
| } |
| case Intrinsic::objectsize: { |
| // If we don't know by now, we're never going to know. |
| const ConstantInt *Min = cast<ConstantInt>(CI.getArgOperand(1)); |
| |
| MIRBuilder.buildConstant(getOrCreateVReg(CI), Min->isZero() ? -1ULL : 0); |
| return true; |
| } |
| case Intrinsic::stackguard: |
| getStackGuard(getOrCreateVReg(CI), MIRBuilder); |
| return true; |
| case Intrinsic::stackprotector: { |
| LLT PtrTy{*CI.getArgOperand(0)->getType(), *DL}; |
| unsigned GuardVal = MRI->createGenericVirtualRegister(PtrTy); |
| getStackGuard(GuardVal, MIRBuilder); |
| |
| AllocaInst *Slot = cast<AllocaInst>(CI.getArgOperand(1)); |
| MIRBuilder.buildStore( |
| GuardVal, getOrCreateVReg(*Slot), |
| *MF->getMachineMemOperand( |
| MachinePointerInfo::getFixedStack(*MF, |
| getOrCreateFrameIndex(*Slot)), |
| MachineMemOperand::MOStore | MachineMemOperand::MOVolatile, |
| PtrTy.getSizeInBits() / 8, 8)); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool IRTranslator::translateCall(const User &U, MachineIRBuilder &MIRBuilder) { |
| const CallInst &CI = cast<CallInst>(U); |
| auto TII = MF->getTarget().getIntrinsicInfo(); |
| const Function *F = CI.getCalledFunction(); |
| |
| if (!F || !F->isIntrinsic()) { |
| unsigned Res = CI.getType()->isVoidTy() ? 0 : getOrCreateVReg(CI); |
| SmallVector<unsigned, 8> Args; |
| for (auto &Arg: CI.arg_operands()) |
| Args.push_back(getOrCreateVReg(*Arg)); |
| |
| return CLI->lowerCall(MIRBuilder, CI, Res, Args, [&]() { |
| return getOrCreateVReg(*CI.getCalledValue()); |
| }); |
| } |
| |
| Intrinsic::ID ID = F->getIntrinsicID(); |
| if (TII && ID == Intrinsic::not_intrinsic) |
| ID = static_cast<Intrinsic::ID>(TII->getIntrinsicID(F)); |
| |
| assert(ID != Intrinsic::not_intrinsic && "unknown intrinsic"); |
| |
| if (translateKnownIntrinsic(CI, ID, MIRBuilder)) |
| return true; |
| |
| unsigned Res = CI.getType()->isVoidTy() ? 0 : getOrCreateVReg(CI); |
| MachineInstrBuilder MIB = |
| MIRBuilder.buildIntrinsic(ID, Res, !CI.doesNotAccessMemory()); |
| |
| for (auto &Arg : CI.arg_operands()) { |
| if (ConstantInt *CI = dyn_cast<ConstantInt>(Arg)) |
| MIB.addImm(CI->getSExtValue()); |
| else |
| MIB.addUse(getOrCreateVReg(*Arg)); |
| } |
| return true; |
| } |
| |
| bool IRTranslator::translateInvoke(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| const InvokeInst &I = cast<InvokeInst>(U); |
| MCContext &Context = MF->getContext(); |
| |
| const BasicBlock *ReturnBB = I.getSuccessor(0); |
| const BasicBlock *EHPadBB = I.getSuccessor(1); |
| |
| const Value *Callee(I.getCalledValue()); |
| const Function *Fn = dyn_cast<Function>(Callee); |
| if (isa<InlineAsm>(Callee)) |
| return false; |
| |
| // FIXME: support invoking patchpoint and statepoint intrinsics. |
| if (Fn && Fn->isIntrinsic()) |
| return false; |
| |
| // FIXME: support whatever these are. |
| if (I.countOperandBundlesOfType(LLVMContext::OB_deopt)) |
| return false; |
| |
| // FIXME: support Windows exception handling. |
| if (!isa<LandingPadInst>(EHPadBB->front())) |
| return false; |
| |
| |
| // Emit the actual call, bracketed by EH_LABELs so that the MF knows about |
| // the region covered by the try. |
| MCSymbol *BeginSymbol = Context.createTempSymbol(); |
| MIRBuilder.buildInstr(TargetOpcode::EH_LABEL).addSym(BeginSymbol); |
| |
| unsigned Res = I.getType()->isVoidTy() ? 0 : getOrCreateVReg(I); |
| SmallVector<CallLowering::ArgInfo, 8> Args; |
| for (auto &Arg: I.arg_operands()) |
| Args.emplace_back(getOrCreateVReg(*Arg), Arg->getType()); |
| |
| if (!CLI->lowerCall(MIRBuilder, MachineOperand::CreateGA(Fn, 0), |
| CallLowering::ArgInfo(Res, I.getType()), Args)) |
| return false; |
| |
| MCSymbol *EndSymbol = Context.createTempSymbol(); |
| MIRBuilder.buildInstr(TargetOpcode::EH_LABEL).addSym(EndSymbol); |
| |
| // FIXME: track probabilities. |
| MachineBasicBlock &EHPadMBB = getOrCreateBB(*EHPadBB), |
| &ReturnMBB = getOrCreateBB(*ReturnBB); |
| MF->addInvoke(&EHPadMBB, BeginSymbol, EndSymbol); |
| MIRBuilder.getMBB().addSuccessor(&ReturnMBB); |
| MIRBuilder.getMBB().addSuccessor(&EHPadMBB); |
| |
| return true; |
| } |
| |
| bool IRTranslator::translateLandingPad(const User &U, |
| MachineIRBuilder &MIRBuilder) { |
| const LandingPadInst &LP = cast<LandingPadInst>(U); |
| |
| MachineBasicBlock &MBB = MIRBuilder.getMBB(); |
| addLandingPadInfo(LP, MBB); |
| |
| MBB.setIsEHPad(); |
| |
| // If there aren't registers to copy the values into (e.g., during SjLj |
| // exceptions), then don't bother. |
| auto &TLI = *MF->getSubtarget().getTargetLowering(); |
| const Constant *PersonalityFn = MF->getFunction()->getPersonalityFn(); |
| if (TLI.getExceptionPointerRegister(PersonalityFn) == 0 && |
| TLI.getExceptionSelectorRegister(PersonalityFn) == 0) |
| return true; |
| |
| // If landingpad's return type is token type, we don't create DAG nodes |
| // for its exception pointer and selector value. The extraction of exception |
| // pointer or selector value from token type landingpads is not currently |
| // supported. |
| if (LP.getType()->isTokenTy()) |
| return true; |
| |
| // Add a label to mark the beginning of the landing pad. Deletion of the |
| // landing pad can thus be detected via the MachineModuleInfo. |
| MIRBuilder.buildInstr(TargetOpcode::EH_LABEL) |
| .addSym(MF->addLandingPad(&MBB)); |
| |
| // Mark exception register as live in. |
| SmallVector<unsigned, 2> Regs; |
| SmallVector<uint64_t, 2> Offsets; |
| LLT p0 = LLT::pointer(0, DL->getPointerSizeInBits()); |
| if (unsigned Reg = TLI.getExceptionPointerRegister(PersonalityFn)) { |
| unsigned VReg = MRI->createGenericVirtualRegister(p0); |
| MIRBuilder.buildCopy(VReg, Reg); |
| Regs.push_back(VReg); |
| Offsets.push_back(0); |
| } |
| |
| if (unsigned Reg = TLI.getExceptionSelectorRegister(PersonalityFn)) { |
| unsigned VReg = MRI->createGenericVirtualRegister(p0); |
| MIRBuilder.buildCopy(VReg, Reg); |
| Regs.push_back(VReg); |
| Offsets.push_back(p0.getSizeInBits()); |
| } |
| |
| MIRBuilder.buildSequence(getOrCreateVReg(LP), Regs, Offsets); |
| return true; |
| } |
| |
| bool IRTranslator::translateStaticAlloca(const AllocaInst &AI, |
| MachineIRBuilder &MIRBuilder) { |
| if (!TPC->isGlobalISelAbortEnabled() && !AI.isStaticAlloca()) |
| return false; |
| |
| assert(AI.isStaticAlloca() && "only handle static allocas now"); |
| unsigned Res = getOrCreateVReg(AI); |
| int FI = getOrCreateFrameIndex(AI); |
| MIRBuilder.buildFrameIndex(Res, FI); |
| return true; |
| } |
| |
| bool IRTranslator::translatePHI(const User &U, MachineIRBuilder &MIRBuilder) { |
| const PHINode &PI = cast<PHINode>(U); |
| auto MIB = MIRBuilder.buildInstr(TargetOpcode::PHI); |
| MIB.addDef(getOrCreateVReg(PI)); |
| |
| PendingPHIs.emplace_back(&PI, MIB.getInstr()); |
| return true; |
| } |
| |
| void IRTranslator::finishPendingPhis() { |
| for (std::pair<const PHINode *, MachineInstr *> &Phi : PendingPHIs) { |
| const PHINode *PI = Phi.first; |
| MachineInstrBuilder MIB(*MF, Phi.second); |
| |
| // All MachineBasicBlocks exist, add them to the PHI. We assume IRTranslator |
| // won't create extra control flow here, otherwise we need to find the |
| // dominating predecessor here (or perhaps force the weirder IRTranslators |
| // to provide a simple boundary). |
| for (unsigned i = 0; i < PI->getNumIncomingValues(); ++i) { |
| assert(BBToMBB[PI->getIncomingBlock(i)]->isSuccessor(MIB->getParent()) && |
| "I appear to have misunderstood Machine PHIs"); |
| MIB.addUse(getOrCreateVReg(*PI->getIncomingValue(i))); |
| MIB.addMBB(BBToMBB[PI->getIncomingBlock(i)]); |
| } |
| } |
| } |
| |
| bool IRTranslator::translate(const Instruction &Inst) { |
| CurBuilder.setDebugLoc(Inst.getDebugLoc()); |
| switch(Inst.getOpcode()) { |
| #define HANDLE_INST(NUM, OPCODE, CLASS) \ |
| case Instruction::OPCODE: return translate##OPCODE(Inst, CurBuilder); |
| #include "llvm/IR/Instruction.def" |
| default: |
| if (!TPC->isGlobalISelAbortEnabled()) |
| return false; |
| llvm_unreachable("unknown opcode"); |
| } |
| } |
| |
| bool IRTranslator::translate(const Constant &C, unsigned Reg) { |
| if (auto CI = dyn_cast<ConstantInt>(&C)) |
| EntryBuilder.buildConstant(Reg, *CI); |
| else if (auto CF = dyn_cast<ConstantFP>(&C)) |
| EntryBuilder.buildFConstant(Reg, *CF); |
| else if (isa<UndefValue>(C)) |
| EntryBuilder.buildInstr(TargetOpcode::IMPLICIT_DEF).addDef(Reg); |
| else if (isa<ConstantPointerNull>(C)) |
| EntryBuilder.buildConstant(Reg, 0); |
| else if (auto GV = dyn_cast<GlobalValue>(&C)) |
| EntryBuilder.buildGlobalValue(Reg, GV); |
| else if (auto CE = dyn_cast<ConstantExpr>(&C)) { |
| switch(CE->getOpcode()) { |
| #define HANDLE_INST(NUM, OPCODE, CLASS) \ |
| case Instruction::OPCODE: return translate##OPCODE(*CE, EntryBuilder); |
| #include "llvm/IR/Instruction.def" |
| default: |
| if (!TPC->isGlobalISelAbortEnabled()) |
| return false; |
| llvm_unreachable("unknown opcode"); |
| } |
| } else if (!TPC->isGlobalISelAbortEnabled()) |
| return false; |
| else |
| llvm_unreachable("unhandled constant kind"); |
| |
| return true; |
| } |
| |
| void IRTranslator::finalizeFunction() { |
| // Release the memory used by the different maps we |
| // needed during the translation. |
| PendingPHIs.clear(); |
| ValToVReg.clear(); |
| FrameIndices.clear(); |
| Constants.clear(); |
| } |
| |
| bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) { |
| MF = &CurMF; |
| const Function &F = *MF->getFunction(); |
| if (F.empty()) |
| return false; |
| CLI = MF->getSubtarget().getCallLowering(); |
| CurBuilder.setMF(*MF); |
| EntryBuilder.setMF(*MF); |
| MRI = &MF->getRegInfo(); |
| DL = &F.getParent()->getDataLayout(); |
| TPC = &getAnalysis<TargetPassConfig>(); |
| |
| assert(PendingPHIs.empty() && "stale PHIs"); |
| |
| // Setup a separate basic-block for the arguments and constants, falling |
| // through to the IR-level Function's entry block. |
| MachineBasicBlock *EntryBB = MF->CreateMachineBasicBlock(); |
| MF->push_back(EntryBB); |
| EntryBB->addSuccessor(&getOrCreateBB(F.front())); |
| EntryBuilder.setMBB(*EntryBB); |
| |
| // Lower the actual args into this basic block. |
| SmallVector<unsigned, 8> VRegArgs; |
| for (const Argument &Arg: F.args()) |
| VRegArgs.push_back(getOrCreateVReg(Arg)); |
| bool Succeeded = CLI->lowerFormalArguments(EntryBuilder, F, VRegArgs); |
| if (!Succeeded) { |
| if (!TPC->isGlobalISelAbortEnabled()) { |
| MF->getProperties().set( |
| MachineFunctionProperties::Property::FailedISel); |
| finalizeFunction(); |
| return false; |
| } |
| report_fatal_error("Unable to lower arguments"); |
| } |
| |
| // And translate the function! |
| for (const BasicBlock &BB: F) { |
| MachineBasicBlock &MBB = getOrCreateBB(BB); |
| // Set the insertion point of all the following translations to |
| // the end of this basic block. |
| CurBuilder.setMBB(MBB); |
| |
| for (const Instruction &Inst: BB) { |
| Succeeded &= translate(Inst); |
| if (!Succeeded) { |
| if (TPC->isGlobalISelAbortEnabled()) |
| reportTranslationError(Inst, "unable to translate instruction"); |
| MF->getProperties().set( |
| MachineFunctionProperties::Property::FailedISel); |
| break; |
| } |
| } |
| } |
| |
| if (Succeeded) { |
| finishPendingPhis(); |
| |
| // Now that the MachineFrameInfo has been configured, no further changes to |
| // the reserved registers are possible. |
| MRI->freezeReservedRegs(*MF); |
| |
| // Merge the argument lowering and constants block with its single |
| // successor, the LLVM-IR entry block. We want the basic block to |
| // be maximal. |
| assert(EntryBB->succ_size() == 1 && |
| "Custom BB used for lowering should have only one successor"); |
| // Get the successor of the current entry block. |
| MachineBasicBlock &NewEntryBB = **EntryBB->succ_begin(); |
| assert(NewEntryBB.pred_size() == 1 && |
| "LLVM-IR entry block has a predecessor!?"); |
| // Move all the instruction from the current entry block to the |
| // new entry block. |
| NewEntryBB.splice(NewEntryBB.begin(), EntryBB, EntryBB->begin(), |
| EntryBB->end()); |
| |
| // Update the live-in information for the new entry block. |
| for (const MachineBasicBlock::RegisterMaskPair &LiveIn : EntryBB->liveins()) |
| NewEntryBB.addLiveIn(LiveIn); |
| NewEntryBB.sortUniqueLiveIns(); |
| |
| // Get rid of the now empty basic block. |
| EntryBB->removeSuccessor(&NewEntryBB); |
| MF->remove(EntryBB); |
| |
| assert(&MF->front() == &NewEntryBB && |
| "New entry wasn't next in the list of basic block!"); |
| } |
| |
| finalizeFunction(); |
| |
| return false; |
| } |