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external/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp
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external/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp
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//===-- PPCMCInstLower.cpp - Convert PPC 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 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/CodeGen/TargetLoweringObjectFile.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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using namespace llvm;
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static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
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return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
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}
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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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StringRef Suffix;
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if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)
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Suffix = "$non_lazy_ptr";
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if (!Suffix.empty())
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Name += DL.getPrivateGlobalPrefix();
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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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Name += Suffix;
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MCSymbol *Sym = Ctx.getOrCreateSymbol(Name);
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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 = 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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}
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return Sym;
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}
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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, 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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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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RefKind = 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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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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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, isDarwin, Ctx);
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break;
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case PPCII::MO_HA:
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Expr = PPCMCExpr::createHa(Expr, isDarwin, 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, 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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MCOperand MCOp;
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if (LowerPPCMachineOperandToMCOperand(MI->getOperand(i), MCOp, AP,
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isDarwin))
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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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bool isDarwin) {
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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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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, isDarwin);
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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, isDarwin);
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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, isDarwin);
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return true;
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case MachineOperand::MO_BlockAddress:
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OutMO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP,
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isDarwin);
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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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