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 "llvm/CodeGen/AsmPrinter.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
19 #include "llvm/MC/MCAsmInfo.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCInst.h"
22 #include "llvm/Target/Mangler.h"
23 #include "llvm/ADT/SmallString.h"
26 static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
27 return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
31 static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){
32 MCContext &Ctx = AP.OutContext;
34 SmallString<128> Name;
36 assert(MO.isSymbol() && "Isn't a symbol reference");
37 Name += AP.MAI->getGlobalPrefix();
38 Name += MO.getSymbolName();
40 const GlobalValue *GV = MO.getGlobal();
41 bool isImplicitlyPrivate = false;
42 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB ||
43 (MO.getTargetFlags() & PPCII::MO_NLP_FLAG))
44 isImplicitlyPrivate = true;
46 AP.Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
49 // If the target flags on the operand changes the name of the symbol, do that
50 // before we return the symbol.
51 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB) {
53 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
54 MachineModuleInfoImpl::StubValueTy &StubSym =
55 getMachOMMI(AP).getFnStubEntry(Sym);
56 if (StubSym.getPointer())
61 MachineModuleInfoImpl::
62 StubValueTy(AP.Mang->getSymbol(MO.getGlobal()),
63 !MO.getGlobal()->hasInternalLinkage());
65 Name.erase(Name.end()-5, Name.end());
67 MachineModuleInfoImpl::
68 StubValueTy(Ctx.GetOrCreateSymbol(Name.str()), false);
73 // If the symbol reference is actually to a non_lazy_ptr, not to the symbol,
74 // then add the suffix.
75 if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) {
76 Name += "$non_lazy_ptr";
77 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
79 MachineModuleInfoMachO &MachO = getMachOMMI(AP);
81 MachineModuleInfoImpl::StubValueTy &StubSym =
82 (MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ?
83 MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym);
85 if (StubSym.getPointer() == 0) {
86 assert(MO.isGlobal() && "Extern symbol not handled yet");
87 StubSym = MachineModuleInfoImpl::
88 StubValueTy(AP.Mang->getSymbol(MO.getGlobal()),
89 !MO.getGlobal()->hasInternalLinkage());
94 return Ctx.GetOrCreateSymbol(Name.str());
97 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
98 AsmPrinter &Printer, bool isDarwin) {
99 MCContext &Ctx = Printer.OutContext;
100 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
102 unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
105 case PPCII::MO_HA16: RefKind = isDarwin ?
106 MCSymbolRefExpr::VK_PPC_DARWIN_HA16 :
107 MCSymbolRefExpr::VK_PPC_GAS_HA16;
109 case PPCII::MO_LO16: RefKind = isDarwin ?
110 MCSymbolRefExpr::VK_PPC_DARWIN_LO16 :
111 MCSymbolRefExpr::VK_PPC_GAS_LO16;
113 case PPCII::MO_TPREL16_HA: RefKind = MCSymbolRefExpr::VK_PPC_TPREL16_HA;
115 case PPCII::MO_TPREL16_LO: RefKind = MCSymbolRefExpr::VK_PPC_TPREL16_LO;
119 // FIXME: This isn't right, but we don't have a good way to express this in
120 // the MC Level, see below.
121 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG)
122 RefKind = MCSymbolRefExpr::VK_None;
124 const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, RefKind, Ctx);
126 if (!MO.isJTI() && MO.getOffset())
127 Expr = MCBinaryExpr::CreateAdd(Expr,
128 MCConstantExpr::Create(MO.getOffset(), Ctx),
131 // Subtract off the PIC base if required.
132 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
133 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
135 const MCExpr *PB = MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx);
136 Expr = MCBinaryExpr::CreateSub(Expr, PB, Ctx);
137 // FIXME: We have no way to make the result be VK_PPC_LO16/VK_PPC_HA16,
138 // since it is not a symbol!
141 return MCOperand::CreateExpr(Expr);
144 void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
145 AsmPrinter &AP, bool isDarwin) {
146 OutMI.setOpcode(MI->getOpcode());
148 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
149 const MachineOperand &MO = MI->getOperand(i);
152 switch (MO.getType()) {
155 llvm_unreachable("unknown operand type");
156 case MachineOperand::MO_Register:
157 assert(!MO.getSubReg() && "Subregs should be eliminated!");
158 MCOp = MCOperand::CreateReg(MO.getReg());
160 case MachineOperand::MO_Immediate:
161 MCOp = MCOperand::CreateImm(MO.getImm());
163 case MachineOperand::MO_MachineBasicBlock:
164 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
165 MO.getMBB()->getSymbol(), AP.OutContext));
167 case MachineOperand::MO_GlobalAddress:
168 case MachineOperand::MO_ExternalSymbol:
169 MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
171 case MachineOperand::MO_JumpTableIndex:
172 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
174 case MachineOperand::MO_ConstantPoolIndex:
175 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
177 case MachineOperand::MO_BlockAddress:
178 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP,
181 case MachineOperand::MO_RegisterMask:
185 OutMI.addOperand(MCOp);