PPCMCInstLower.cpp revision 263508
1359575Sdim//===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===// 2359575Sdim// 3359575Sdim// The LLVM Compiler Infrastructure 4359575Sdim// 5359575Sdim// This file is distributed under the University of Illinois Open Source 6359575Sdim// License. See LICENSE.TXT for details. 7359575Sdim// 8359575Sdim//===----------------------------------------------------------------------===// 9359575Sdim// 10359575Sdim// This file contains code to lower PPC MachineInstrs to their corresponding 11359575Sdim// MCInst records. 12359575Sdim// 13359575Sdim//===----------------------------------------------------------------------===// 14359575Sdim 15359575Sdim#include "PPC.h" 16359575Sdim#include "MCTargetDesc/PPCMCExpr.h" 17359575Sdim#include "llvm/ADT/SmallString.h" 18359575Sdim#include "llvm/ADT/Twine.h" 19359575Sdim#include "llvm/CodeGen/AsmPrinter.h" 20359575Sdim#include "llvm/CodeGen/MachineFunction.h" 21359575Sdim#include "llvm/CodeGen/MachineModuleInfoImpls.h" 22359575Sdim#include "llvm/IR/GlobalValue.h" 23359575Sdim#include "llvm/MC/MCAsmInfo.h" 24359575Sdim#include "llvm/MC/MCExpr.h" 25359575Sdim#include "llvm/MC/MCInst.h" 26359575Sdim#include "llvm/Target/Mangler.h" 27359575Sdimusing namespace llvm; 28359575Sdim 29359575Sdimstatic MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) { 30359575Sdim return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>(); 31359575Sdim} 32359575Sdim 33359575Sdim 34359575Sdimstatic MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){ 35359575Sdim MCContext &Ctx = AP.OutContext; 36359575Sdim 37359575Sdim SmallString<128> Name; 38359575Sdim if (!MO.isGlobal()) { 39359575Sdim assert(MO.isSymbol() && "Isn't a symbol reference"); 40359575Sdim Name += AP.MAI->getGlobalPrefix(); 41359575Sdim Name += MO.getSymbolName(); 42359575Sdim } else { 43359575Sdim const GlobalValue *GV = MO.getGlobal(); 44359575Sdim bool isImplicitlyPrivate = false; 45359575Sdim if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB || 46359575Sdim (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)) 47359575Sdim isImplicitlyPrivate = true; 48359575Sdim 49359575Sdim AP.Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate); 50359575Sdim } 51359575Sdim 52359575Sdim // If the target flags on the operand changes the name of the symbol, do that 53359575Sdim // before we return the symbol. 54359575Sdim if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB) { 55359575Sdim Name += "$stub"; 56359575Sdim const char *PGP = AP.MAI->getPrivateGlobalPrefix(); 57359575Sdim const char *Prefix = ""; 58359575Sdim if (!Name.startswith(PGP)) { 59359575Sdim // http://llvm.org/bugs/show_bug.cgi?id=15763 60359575Sdim // all stubs and lazy_ptrs should be local symbols, which need leading 'L' 61359575Sdim Prefix = PGP; 62359575Sdim } 63359575Sdim MCSymbol *Sym = Ctx.GetOrCreateSymbol(Twine(Prefix) + Twine(Name)); 64359575Sdim MachineModuleInfoImpl::StubValueTy &StubSym = 65359575Sdim getMachOMMI(AP).getFnStubEntry(Sym); 66359575Sdim if (StubSym.getPointer()) 67359575Sdim return Sym; 68359575Sdim 69359575Sdim if (MO.isGlobal()) { 70359575Sdim StubSym = 71359575Sdim MachineModuleInfoImpl:: 72359575Sdim StubValueTy(AP.getSymbol(MO.getGlobal()), 73359575Sdim !MO.getGlobal()->hasInternalLinkage()); 74359575Sdim } else { 75359575Sdim Name.erase(Name.end()-5, Name.end()); 76359575Sdim StubSym = 77359575Sdim MachineModuleInfoImpl:: 78359575Sdim StubValueTy(Ctx.GetOrCreateSymbol(Name.str()), false); 79359575Sdim } 80359575Sdim return Sym; 81359575Sdim } 82359575Sdim 83359575Sdim // If the symbol reference is actually to a non_lazy_ptr, not to the symbol, 84359575Sdim // then add the suffix. 85359575Sdim if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) { 86359575Sdim Name += "$non_lazy_ptr"; 87359575Sdim MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str()); 88359575Sdim 89359575Sdim MachineModuleInfoMachO &MachO = getMachOMMI(AP); 90359575Sdim 91359575Sdim MachineModuleInfoImpl::StubValueTy &StubSym = 92359575Sdim (MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ? 93359575Sdim MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym); 94359575Sdim 95359575Sdim if (StubSym.getPointer() == 0) { 96359575Sdim assert(MO.isGlobal() && "Extern symbol not handled yet"); 97359575Sdim StubSym = MachineModuleInfoImpl:: 98359575Sdim StubValueTy(AP.getSymbol(MO.getGlobal()), 99359575Sdim !MO.getGlobal()->hasInternalLinkage()); 100359575Sdim } 101359575Sdim return Sym; 102359575Sdim } 103359575Sdim 104359575Sdim return Ctx.GetOrCreateSymbol(Name.str()); 105359575Sdim} 106359575Sdim 107359575Sdimstatic MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol, 108359575Sdim AsmPrinter &Printer, bool isDarwin) { 109359575Sdim MCContext &Ctx = Printer.OutContext; 110359575Sdim MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None; 111359575Sdim 112359575Sdim unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK; 113359575Sdim 114359575Sdim switch (access) { 115359575Sdim case PPCII::MO_TPREL_LO: 116359575Sdim RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO; 117359575Sdim break; 118359575Sdim case PPCII::MO_TPREL_HA: 119359575Sdim RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA; 120359575Sdim break; 121359575Sdim case PPCII::MO_DTPREL_LO: 122359575Sdim RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO; 123359575Sdim break; 124359575Sdim case PPCII::MO_TLSLD_LO: 125359575Sdim RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO; 126359575Sdim break; 127359575Sdim case PPCII::MO_TOC_LO: 128359575Sdim RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO; 129359575Sdim break; 130359575Sdim case PPCII::MO_TLS: 131359575Sdim RefKind = MCSymbolRefExpr::VK_PPC_TLS; 132359575Sdim break; 133359575Sdim } 134359575Sdim 135359575Sdim const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, RefKind, Ctx); 136359575Sdim 137359575Sdim if (!MO.isJTI() && MO.getOffset()) 138359575Sdim Expr = MCBinaryExpr::CreateAdd(Expr, 139359575Sdim MCConstantExpr::Create(MO.getOffset(), Ctx), 140359575Sdim Ctx); 141359575Sdim 142359575Sdim // Subtract off the PIC base if required. 143359575Sdim if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) { 144359575Sdim const MachineFunction *MF = MO.getParent()->getParent()->getParent(); 145359575Sdim 146359575Sdim const MCExpr *PB = MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx); 147359575Sdim Expr = MCBinaryExpr::CreateSub(Expr, PB, Ctx); 148359575Sdim } 149359575Sdim 150359575Sdim // Add ha16() / lo16() markers if required. 151359575Sdim switch (access) { 152359575Sdim case PPCII::MO_LO: 153359575Sdim Expr = PPCMCExpr::CreateLo(Expr, isDarwin, Ctx); 154359575Sdim break; 155359575Sdim case PPCII::MO_HA: 156359575Sdim Expr = PPCMCExpr::CreateHa(Expr, isDarwin, Ctx); 157359575Sdim break; 158359575Sdim } 159359575Sdim 160359575Sdim return MCOperand::CreateExpr(Expr); 161359575Sdim} 162359575Sdim 163359575Sdimvoid llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI, 164359575Sdim AsmPrinter &AP, bool isDarwin) { 165359575Sdim OutMI.setOpcode(MI->getOpcode()); 166359575Sdim 167359575Sdim for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 168359575Sdim const MachineOperand &MO = MI->getOperand(i); 169359575Sdim 170359575Sdim MCOperand MCOp; 171359575Sdim switch (MO.getType()) { 172359575Sdim default: 173 MI->dump(); 174 llvm_unreachable("unknown operand type"); 175 case MachineOperand::MO_Register: 176 assert(!MO.getSubReg() && "Subregs should be eliminated!"); 177 MCOp = MCOperand::CreateReg(MO.getReg()); 178 break; 179 case MachineOperand::MO_Immediate: 180 MCOp = MCOperand::CreateImm(MO.getImm()); 181 break; 182 case MachineOperand::MO_MachineBasicBlock: 183 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create( 184 MO.getMBB()->getSymbol(), AP.OutContext)); 185 break; 186 case MachineOperand::MO_GlobalAddress: 187 case MachineOperand::MO_ExternalSymbol: 188 MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin); 189 break; 190 case MachineOperand::MO_JumpTableIndex: 191 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin); 192 break; 193 case MachineOperand::MO_ConstantPoolIndex: 194 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin); 195 break; 196 case MachineOperand::MO_BlockAddress: 197 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP, 198 isDarwin); 199 break; 200 case MachineOperand::MO_RegisterMask: 201 continue; 202 } 203 204 OutMI.addOperand(MCOp); 205 } 206} 207