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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262238 91177308-0d34-0410-b5e6-96231b3b80d8
171 lines
5.9 KiB
C++
171 lines
5.9 KiB
C++
//===- HexagonMCInstLower.cpp - Convert Hexagon MachineInstr to an MCInst -===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains code to lower Hexagon MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "Hexagon.h"
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#include "HexagonAsmPrinter.h"
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#include "HexagonMachineFunctionInfo.h"
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#include "MCTargetDesc/HexagonMCInstrInfo.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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using namespace llvm;
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namespace llvm {
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void HexagonLowerToMC(const MCInstrInfo &MCII, const MachineInstr *MI,
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MCInst &MCB, HexagonAsmPrinter &AP);
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}
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static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
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HexagonAsmPrinter &Printer, bool MustExtend) {
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MCContext &MC = Printer.OutContext;
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const MCExpr *ME;
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// Populate the relocation type based on Hexagon target flags
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// set on an operand
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MCSymbolRefExpr::VariantKind RelocationType;
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switch (MO.getTargetFlags()) {
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default:
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RelocationType = MCSymbolRefExpr::VK_None;
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break;
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case HexagonII::MO_PCREL:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_PCREL;
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break;
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case HexagonII::MO_GOT:
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RelocationType = MCSymbolRefExpr::VK_GOT;
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break;
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case HexagonII::MO_LO16:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_LO16;
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break;
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case HexagonII::MO_HI16:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_HI16;
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break;
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case HexagonII::MO_GPREL:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_GPREL;
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break;
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case HexagonII::MO_GDGOT:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_GD_GOT;
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break;
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case HexagonII::MO_GDPLT:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_GD_PLT;
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break;
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case HexagonII::MO_IE:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_IE;
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break;
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case HexagonII::MO_IEGOT:
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RelocationType = MCSymbolRefExpr::VK_Hexagon_IE_GOT;
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break;
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case HexagonII::MO_TPREL:
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RelocationType = MCSymbolRefExpr::VK_TPREL;
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break;
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}
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ME = MCSymbolRefExpr::create(Symbol, RelocationType, MC);
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if (!MO.isJTI() && MO.getOffset())
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ME = MCBinaryExpr::createAdd(ME, MCConstantExpr::create(MO.getOffset(), MC),
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MC);
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ME = HexagonMCExpr::create(ME, MC);
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HexagonMCInstrInfo::setMustExtend(*ME, MustExtend);
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return MCOperand::createExpr(ME);
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}
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// Create an MCInst from a MachineInstr
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void llvm::HexagonLowerToMC(const MCInstrInfo &MCII, const MachineInstr *MI,
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MCInst &MCB, HexagonAsmPrinter &AP) {
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if (MI->getOpcode() == Hexagon::ENDLOOP0) {
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HexagonMCInstrInfo::setInnerLoop(MCB);
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return;
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}
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if (MI->getOpcode() == Hexagon::ENDLOOP1) {
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HexagonMCInstrInfo::setOuterLoop(MCB);
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return;
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}
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MCInst *MCI = new (AP.OutContext) MCInst;
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MCI->setOpcode(MI->getOpcode());
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assert(MCI->getOpcode() == static_cast<unsigned>(MI->getOpcode()) &&
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"MCI opcode should have been set on construction");
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for (unsigned i = 0, e = MI->getNumOperands(); i < e; i++) {
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const MachineOperand &MO = MI->getOperand(i);
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MCOperand MCO;
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bool MustExtend = MO.getTargetFlags() & HexagonII::HMOTF_ConstExtended;
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switch (MO.getType()) {
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default:
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MI->dump();
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llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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// Ignore all implicit register operands.
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if (MO.isImplicit()) continue;
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MCO = MCOperand::createReg(MO.getReg());
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break;
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case MachineOperand::MO_FPImmediate: {
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APFloat Val = MO.getFPImm()->getValueAPF();
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// FP immediates are used only when setting GPRs, so they may be dealt
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// with like regular immediates from this point on.
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auto Expr = HexagonMCExpr::create(
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MCConstantExpr::create(*Val.bitcastToAPInt().getRawData(),
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AP.OutContext),
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AP.OutContext);
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HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
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MCO = MCOperand::createExpr(Expr);
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break;
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}
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case MachineOperand::MO_Immediate: {
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auto Expr = HexagonMCExpr::create(
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MCConstantExpr::create(MO.getImm(), AP.OutContext), AP.OutContext);
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HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
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MCO = MCOperand::createExpr(Expr);
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break;
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}
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case MachineOperand::MO_MachineBasicBlock: {
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MCExpr const *Expr = MCSymbolRefExpr::create(MO.getMBB()->getSymbol(),
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AP.OutContext);
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Expr = HexagonMCExpr::create(Expr, AP.OutContext);
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HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
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MCO = MCOperand::createExpr(Expr);
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break;
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}
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case MachineOperand::MO_GlobalAddress:
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MCO = GetSymbolRef(MO, AP.getSymbol(MO.getGlobal()), AP, MustExtend);
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break;
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case MachineOperand::MO_ExternalSymbol:
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MCO = GetSymbolRef(MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()),
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AP, MustExtend);
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break;
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case MachineOperand::MO_JumpTableIndex:
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MCO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, MustExtend);
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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MCO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, MustExtend);
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break;
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case MachineOperand::MO_BlockAddress:
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MCO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP,
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MustExtend);
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break;
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}
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MCI->addOperand(MCO);
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}
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AP.HexagonProcessInstruction(*MCI, *MI);
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HexagonMCInstrInfo::extendIfNeeded(AP.OutContext, MCII, MCB, *MCI);
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MCB.addOperand(MCOperand::createInst(MCI));
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}
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