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//===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===//
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// The LLVM Compiler Infrastructure
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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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// This file contains code to lower PPC MachineInstrs to their corresponding
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/PPCMCExpr.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/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/TargetLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
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return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
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static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){
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const TargetMachine &TM = AP.TM;
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Mangler *Mang = AP.Mang;
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const DataLayout *DL = TM.getDataLayout();
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MCContext &Ctx = AP.OutContext;
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bool isDarwin = TM.getTargetTriple().isOSDarwin();
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SmallString<128> Name;
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if (MO.getTargetFlags() == PPCII::MO_PLT_OR_STUB) {
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} else if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)
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Suffix = "$non_lazy_ptr";
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Name += DL->getPrivateGlobalPrefix();
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unsigned PrefixLen = Name.size();
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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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const GlobalValue *GV = MO.getGlobal();
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TM.getNameWithPrefix(Name, GV, *Mang);
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unsigned OrigLen = Name.size() - PrefixLen;
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MCSymbol *Sym = Ctx.getOrCreateSymbol(Name);
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StringRef OrigName = StringRef(Name).substr(PrefixLen, OrigLen);
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// If the target flags on the operand changes the name of the symbol, do that
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// before we return the symbol.
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if (MO.getTargetFlags() == PPCII::MO_PLT_OR_STUB && isDarwin) {
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MachineModuleInfoImpl::StubValueTy &StubSym =
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getMachOMMI(AP).getFnStubEntry(Sym);
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if (StubSym.getPointer())
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MachineModuleInfoImpl::
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StubValueTy(AP.getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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MachineModuleInfoImpl::
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StubValueTy(Ctx.getOrCreateSymbol(OrigName), false);
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// If the symbol reference is actually to a non_lazy_ptr, not to the symbol,
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// then add the suffix.
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if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) {
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MachineModuleInfoMachO &MachO = getMachOMMI(AP);
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MachineModuleInfoImpl::StubValueTy &StubSym =
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(MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ?
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MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym);
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if (!StubSym.getPointer()) {
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assert(MO.isGlobal() && "Extern symbol not handled yet");
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StubSym = MachineModuleInfoImpl::
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StubValueTy(AP.getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
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AsmPrinter &Printer, bool isDarwin) {
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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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case PPCII::MO_TPREL_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO;
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case PPCII::MO_TPREL_HA:
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RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA;
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case PPCII::MO_DTPREL_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO;
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case PPCII::MO_TLSLD_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO;
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case PPCII::MO_TOC_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO;
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RefKind = MCSymbolRefExpr::VK_PPC_TLS;
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if (MO.getTargetFlags() == PPCII::MO_PLT_OR_STUB && !isDarwin)
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RefKind = MCSymbolRefExpr::VK_PLT;
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const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, RefKind, 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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// 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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// Add ha16() / lo16() markers if required.
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Expr = PPCMCExpr::createLo(Expr, isDarwin, Ctx);
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Expr = PPCMCExpr::createHa(Expr, isDarwin, Ctx);
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return MCOperand::createExpr(Expr);
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void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
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AsmPrinter &AP, bool isDarwin) {
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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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const MachineOperand &MO = MI->getOperand(i);
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switch (MO.getType()) {
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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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MCOp = MCOperand::createReg(MO.getReg());
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::createImm(MO.getImm());
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case MachineOperand::MO_MachineBasicBlock:
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MCOp = MCOperand::createExpr(MCSymbolRefExpr::create(
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MO.getMBB()->getSymbol(), AP.OutContext));
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
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case MachineOperand::MO_JumpTableIndex:
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MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
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case MachineOperand::MO_ConstantPoolIndex:
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MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
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case MachineOperand::MO_BlockAddress:
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MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP,
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case MachineOperand::MO_RegisterMask:
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OutMI.addOperand(MCOp);