1 //===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains code to lower PPC MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "MCTargetDesc/PPCMCExpr.h"
17 #include "PPCSubtarget.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/Twine.h"
20 #include "llvm/CodeGen/AsmPrinter.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
23 #include "llvm/CodeGen/TargetLowering.h"
24 #include "llvm/IR/DataLayout.h"
25 #include "llvm/IR/GlobalValue.h"
26 #include "llvm/IR/Mangler.h"
27 #include "llvm/MC/MCAsmInfo.h"
28 #include "llvm/MC/MCExpr.h"
29 #include "llvm/MC/MCInst.h"
30 #include "llvm/Target/TargetLoweringObjectFile.h"
33 static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
34 return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
37 static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO,
39 const TargetMachine &TM = AP.TM;
40 Mangler &Mang = TM.getObjFileLowering()->getMangler();
41 const DataLayout &DL = AP.getDataLayout();
42 MCContext &Ctx = AP.OutContext;
44 SmallString<128> Name;
46 if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)
47 Suffix = "$non_lazy_ptr";
50 Name += DL.getPrivateGlobalPrefix();
53 assert(MO.isSymbol() && "Isn't a symbol reference");
54 Mangler::getNameWithPrefix(Name, MO.getSymbolName(), DL);
56 const GlobalValue *GV = MO.getGlobal();
57 TM.getNameWithPrefix(Name, GV, Mang);
61 MCSymbol *Sym = Ctx.getOrCreateSymbol(Name);
63 // If the symbol reference is actually to a non_lazy_ptr, not to the symbol,
64 // then add the suffix.
65 if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) {
66 MachineModuleInfoMachO &MachO = getMachOMMI(AP);
68 MachineModuleInfoImpl::StubValueTy &StubSym = MachO.getGVStubEntry(Sym);
70 if (!StubSym.getPointer()) {
71 assert(MO.isGlobal() && "Extern symbol not handled yet");
72 StubSym = MachineModuleInfoImpl::
73 StubValueTy(AP.getSymbol(MO.getGlobal()),
74 !MO.getGlobal()->hasInternalLinkage());
82 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
83 AsmPrinter &Printer, bool isDarwin) {
84 MCContext &Ctx = Printer.OutContext;
85 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
87 unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
90 case PPCII::MO_TPREL_LO:
91 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO;
93 case PPCII::MO_TPREL_HA:
94 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA;
96 case PPCII::MO_DTPREL_LO:
97 RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO;
99 case PPCII::MO_TLSLD_LO:
100 RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO;
102 case PPCII::MO_TOC_LO:
103 RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO;
106 RefKind = MCSymbolRefExpr::VK_PPC_TLS;
110 if (MO.getTargetFlags() == PPCII::MO_PLT)
111 RefKind = MCSymbolRefExpr::VK_PLT;
113 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
114 const PPCSubtarget *Subtarget = &(MF->getSubtarget<PPCSubtarget>());
115 const TargetMachine &TM = Printer.TM;
116 const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, RefKind, Ctx);
117 // -msecure-plt option works only in PIC mode. If secure plt mode
118 // is on add 32768 to symbol.
119 if (Subtarget->isSecurePlt() && TM.isPositionIndependent() &&
120 MO.getTargetFlags() == PPCII::MO_PLT)
121 Expr = MCBinaryExpr::createAdd(Expr,
122 MCConstantExpr::create(32768, Ctx),
125 if (!MO.isJTI() && MO.getOffset())
126 Expr = MCBinaryExpr::createAdd(Expr,
127 MCConstantExpr::create(MO.getOffset(), Ctx),
130 // Subtract off the PIC base if required.
131 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
132 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
134 const MCExpr *PB = MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
135 Expr = MCBinaryExpr::createSub(Expr, PB, Ctx);
138 // Add ha16() / lo16() markers if required.
141 Expr = PPCMCExpr::createLo(Expr, isDarwin, Ctx);
144 Expr = PPCMCExpr::createHa(Expr, isDarwin, Ctx);
148 return MCOperand::createExpr(Expr);
151 void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
152 AsmPrinter &AP, bool isDarwin) {
153 OutMI.setOpcode(MI->getOpcode());
155 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
157 if (LowerPPCMachineOperandToMCOperand(MI->getOperand(i), MCOp, AP,
159 OutMI.addOperand(MCOp);
163 bool llvm::LowerPPCMachineOperandToMCOperand(const MachineOperand &MO,
164 MCOperand &OutMO, AsmPrinter &AP,
166 switch (MO.getType()) {
168 llvm_unreachable("unknown operand type");
169 case MachineOperand::MO_Register:
170 assert(!MO.getSubReg() && "Subregs should be eliminated!");
171 assert(MO.getReg() > PPC::NoRegister &&
172 MO.getReg() < PPC::NUM_TARGET_REGS &&
173 "Invalid register for this target!");
174 OutMO = MCOperand::createReg(MO.getReg());
176 case MachineOperand::MO_Immediate:
177 OutMO = MCOperand::createImm(MO.getImm());
179 case MachineOperand::MO_MachineBasicBlock:
180 OutMO = MCOperand::createExpr(
181 MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), AP.OutContext));
183 case MachineOperand::MO_GlobalAddress:
184 case MachineOperand::MO_ExternalSymbol:
185 OutMO = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
187 case MachineOperand::MO_JumpTableIndex:
188 OutMO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
190 case MachineOperand::MO_ConstantPoolIndex:
191 OutMO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
193 case MachineOperand::MO_BlockAddress:
194 OutMO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP,
197 case MachineOperand::MO_RegisterMask: