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 //===----------------------------------------------------------------------===//
16 #include "MCTargetDesc/PPCMCExpr.h"
17 #include "llvm/ADT/SmallString.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/CodeGen/AsmPrinter.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/IR/GlobalValue.h"
24 #include "llvm/IR/Mangler.h"
25 #include "llvm/MC/MCAsmInfo.h"
26 #include "llvm/MC/MCExpr.h"
27 #include "llvm/MC/MCInst.h"
28 #include "llvm/Target/TargetMachine.h"
31 static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
32 return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
36 static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){
37 const DataLayout *DL = AP.TM.getDataLayout();
38 MCContext &Ctx = AP.OutContext;
40 SmallString<128> Name;
42 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB)
44 else if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)
45 Suffix = "$non_lazy_ptr";
48 Name += DL->getPrivateGlobalPrefix();
50 unsigned PrefixLen = Name.size();
53 assert(MO.isSymbol() && "Isn't a symbol reference");
54 AP.Mang->getNameWithPrefix(Name, MO.getSymbolName());
56 const GlobalValue *GV = MO.getGlobal();
57 AP.Mang->getNameWithPrefix(Name, GV);
60 unsigned OrigLen = Name.size() - PrefixLen;
63 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
64 StringRef OrigName = StringRef(Name).substr(PrefixLen, OrigLen);
66 // If the target flags on the operand changes the name of the symbol, do that
67 // before we return the symbol.
68 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB) {
69 MachineModuleInfoImpl::StubValueTy &StubSym =
70 getMachOMMI(AP).getFnStubEntry(Sym);
71 if (StubSym.getPointer())
76 MachineModuleInfoImpl::
77 StubValueTy(AP.getSymbol(MO.getGlobal()),
78 !MO.getGlobal()->hasInternalLinkage());
81 MachineModuleInfoImpl::
82 StubValueTy(Ctx.GetOrCreateSymbol(OrigName), false);
87 // If the symbol reference is actually to a non_lazy_ptr, not to the symbol,
88 // then add the suffix.
89 if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) {
90 MachineModuleInfoMachO &MachO = getMachOMMI(AP);
92 MachineModuleInfoImpl::StubValueTy &StubSym =
93 (MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ?
94 MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym);
96 if (StubSym.getPointer() == 0) {
97 assert(MO.isGlobal() && "Extern symbol not handled yet");
98 StubSym = MachineModuleInfoImpl::
99 StubValueTy(AP.getSymbol(MO.getGlobal()),
100 !MO.getGlobal()->hasInternalLinkage());
108 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
109 AsmPrinter &Printer, bool isDarwin) {
110 MCContext &Ctx = Printer.OutContext;
111 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
113 unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
116 case PPCII::MO_TPREL_LO:
117 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO;
119 case PPCII::MO_TPREL_HA:
120 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA;
122 case PPCII::MO_DTPREL_LO:
123 RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO;
125 case PPCII::MO_TLSLD_LO:
126 RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO;
128 case PPCII::MO_TOC_LO:
129 RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO;
132 RefKind = MCSymbolRefExpr::VK_PPC_TLS;
136 const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, RefKind, Ctx);
138 if (!MO.isJTI() && MO.getOffset())
139 Expr = MCBinaryExpr::CreateAdd(Expr,
140 MCConstantExpr::Create(MO.getOffset(), Ctx),
143 // Subtract off the PIC base if required.
144 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
145 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
147 const MCExpr *PB = MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx);
148 Expr = MCBinaryExpr::CreateSub(Expr, PB, Ctx);
151 // Add ha16() / lo16() markers if required.
154 Expr = PPCMCExpr::CreateLo(Expr, isDarwin, Ctx);
157 Expr = PPCMCExpr::CreateHa(Expr, isDarwin, Ctx);
161 return MCOperand::CreateExpr(Expr);
164 void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
165 AsmPrinter &AP, bool isDarwin) {
166 OutMI.setOpcode(MI->getOpcode());
168 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
169 const MachineOperand &MO = MI->getOperand(i);
172 switch (MO.getType()) {
175 llvm_unreachable("unknown operand type");
176 case MachineOperand::MO_Register:
177 assert(!MO.getSubReg() && "Subregs should be eliminated!");
178 MCOp = MCOperand::CreateReg(MO.getReg());
180 case MachineOperand::MO_Immediate:
181 MCOp = MCOperand::CreateImm(MO.getImm());
183 case MachineOperand::MO_MachineBasicBlock:
184 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
185 MO.getMBB()->getSymbol(), AP.OutContext));
187 case MachineOperand::MO_GlobalAddress:
188 case MachineOperand::MO_ExternalSymbol:
189 MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
191 case MachineOperand::MO_JumpTableIndex:
192 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
194 case MachineOperand::MO_ConstantPoolIndex:
195 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
197 case MachineOperand::MO_BlockAddress:
198 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP,
201 case MachineOperand::MO_RegisterMask:
205 OutMI.addOperand(MCOp);