205 lines
7.3 KiB
C++
205 lines
7.3 KiB
C++
//===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===//
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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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//
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// This file contains code to lower PPC MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/PPCMCExpr.h"
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#include "PPC.h"
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#include "PPCSubtarget.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfoImpls.h"
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#include "llvm/CodeGen/TargetLowering.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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using namespace llvm;
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static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO,
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AsmPrinter &AP) {
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const TargetMachine &TM = AP.TM;
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Mangler &Mang = TM.getObjFileLowering()->getMangler();
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const DataLayout &DL = AP.getDataLayout();
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MCContext &Ctx = AP.OutContext;
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SmallString<128> Name;
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if (!MO.isGlobal()) {
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assert(MO.isSymbol() && "Isn't a symbol reference");
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Mangler::getNameWithPrefix(Name, MO.getSymbolName(), DL);
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} else {
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const GlobalValue *GV = MO.getGlobal();
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TM.getNameWithPrefix(Name, GV, Mang);
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}
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MCSymbol *Sym = Ctx.getOrCreateSymbol(Name);
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return Sym;
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}
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static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
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AsmPrinter &Printer) {
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MCContext &Ctx = Printer.OutContext;
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MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
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unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
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switch (access) {
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case PPCII::MO_TPREL_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO;
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break;
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case PPCII::MO_TPREL_HA:
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RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA;
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break;
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case PPCII::MO_DTPREL_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO;
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break;
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case PPCII::MO_TLSLD_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO;
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break;
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case PPCII::MO_TOC_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO;
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break;
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case PPCII::MO_TLS:
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bool IsPCRel = (MO.getTargetFlags() & ~access) == PPCII::MO_PCREL_FLAG;
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RefKind = IsPCRel ? MCSymbolRefExpr::VK_PPC_TLS_PCREL
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: MCSymbolRefExpr::VK_PPC_TLS;
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break;
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}
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if (MO.getTargetFlags() == PPCII::MO_PLT)
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RefKind = MCSymbolRefExpr::VK_PLT;
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else if (MO.getTargetFlags() == PPCII::MO_PCREL_FLAG)
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RefKind = MCSymbolRefExpr::VK_PCREL;
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else if (MO.getTargetFlags() == (PPCII::MO_PCREL_FLAG | PPCII::MO_GOT_FLAG))
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RefKind = MCSymbolRefExpr::VK_PPC_GOT_PCREL;
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else if (MO.getTargetFlags() == (PPCII::MO_PCREL_FLAG | PPCII::MO_TPREL_FLAG))
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RefKind = MCSymbolRefExpr::VK_TPREL;
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else if (MO.getTargetFlags() == PPCII::MO_GOT_TLSGD_PCREL_FLAG)
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RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSGD_PCREL;
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else if (MO.getTargetFlags() == PPCII::MO_GOT_TLSLD_PCREL_FLAG)
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RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_PCREL;
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else if (MO.getTargetFlags() == PPCII::MO_GOT_TPREL_PCREL_FLAG)
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RefKind = MCSymbolRefExpr::VK_PPC_GOT_TPREL_PCREL;
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const MachineInstr *MI = MO.getParent();
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const MachineFunction *MF = MI->getMF();
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const Module *M = MF->getFunction().getParent();
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const PPCSubtarget *Subtarget = &(MF->getSubtarget<PPCSubtarget>());
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const TargetMachine &TM = Printer.TM;
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unsigned MIOpcode = MI->getOpcode();
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assert((Subtarget->isUsingPCRelativeCalls() || MIOpcode != PPC::BL8_NOTOC) &&
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"BL8_NOTOC is only valid when using PC Relative Calls.");
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if (Subtarget->isUsingPCRelativeCalls()) {
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if (MIOpcode == PPC::TAILB || MIOpcode == PPC::TAILB8 ||
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MIOpcode == PPC::TCRETURNdi || MIOpcode == PPC::TCRETURNdi8 ||
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MIOpcode == PPC::BL8_NOTOC) {
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RefKind = MCSymbolRefExpr::VK_PPC_NOTOC;
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}
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if (MO.getTargetFlags() == PPCII::MO_PCREL_OPT_FLAG)
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RefKind = MCSymbolRefExpr::VK_PPC_PCREL_OPT;
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}
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const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, RefKind, Ctx);
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// If -msecure-plt -fPIC, add 32768 to symbol.
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if (Subtarget->isSecurePlt() && TM.isPositionIndependent() &&
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M->getPICLevel() == PICLevel::BigPIC &&
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MO.getTargetFlags() == PPCII::MO_PLT)
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Expr =
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MCBinaryExpr::createAdd(Expr, MCConstantExpr::create(32768, Ctx), Ctx);
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if (!MO.isJTI() && MO.getOffset())
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Expr = MCBinaryExpr::createAdd(Expr,
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MCConstantExpr::create(MO.getOffset(), Ctx),
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Ctx);
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// Subtract off the PIC base if required.
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if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
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const MachineFunction *MF = MO.getParent()->getParent()->getParent();
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const MCExpr *PB = MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
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Expr = MCBinaryExpr::createSub(Expr, PB, Ctx);
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}
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// Add ha16() / lo16() markers if required.
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switch (access) {
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case PPCII::MO_LO:
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Expr = PPCMCExpr::createLo(Expr, Ctx);
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break;
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case PPCII::MO_HA:
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Expr = PPCMCExpr::createHa(Expr, Ctx);
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break;
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}
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return MCOperand::createExpr(Expr);
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}
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void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
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AsmPrinter &AP) {
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OutMI.setOpcode(MI->getOpcode());
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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MCOperand MCOp;
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if (LowerPPCMachineOperandToMCOperand(MI->getOperand(i), MCOp, AP))
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OutMI.addOperand(MCOp);
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}
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}
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bool llvm::LowerPPCMachineOperandToMCOperand(const MachineOperand &MO,
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MCOperand &OutMO, AsmPrinter &AP) {
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switch (MO.getType()) {
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default:
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llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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assert(!MO.getSubReg() && "Subregs should be eliminated!");
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assert(MO.getReg() > PPC::NoRegister &&
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MO.getReg() < PPC::NUM_TARGET_REGS &&
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"Invalid register for this target!");
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// Ignore all implicit register operands.
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if (MO.isImplicit())
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return false;
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OutMO = MCOperand::createReg(MO.getReg());
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return true;
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case MachineOperand::MO_Immediate:
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OutMO = MCOperand::createImm(MO.getImm());
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return true;
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case MachineOperand::MO_MachineBasicBlock:
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OutMO = MCOperand::createExpr(
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MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), AP.OutContext));
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return true;
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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OutMO = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP);
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return true;
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case MachineOperand::MO_JumpTableIndex:
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OutMO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
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return true;
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case MachineOperand::MO_ConstantPoolIndex:
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OutMO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
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return true;
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case MachineOperand::MO_BlockAddress:
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OutMO =
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GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP);
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return true;
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case MachineOperand::MO_MCSymbol:
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OutMO = GetSymbolRef(MO, MO.getMCSymbol(), AP);
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return true;
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case MachineOperand::MO_RegisterMask:
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return false;
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}
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}
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