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/ADT/SmallString.h"
17 #include "llvm/ADT/Twine.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
21 #include "llvm/IR/GlobalValue.h"
22 #include "llvm/MC/MCAsmInfo.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 #include "llvm/Target/Mangler.h"
28 static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
29 return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
33 static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){
34 MCContext &Ctx = AP.OutContext;
36 SmallString<128> Name;
38 assert(MO.isSymbol() && "Isn't a symbol reference");
39 Name += AP.MAI->getGlobalPrefix();
40 Name += MO.getSymbolName();
42 const GlobalValue *GV = MO.getGlobal();
43 bool isImplicitlyPrivate = false;
44 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB ||
45 (MO.getTargetFlags() & PPCII::MO_NLP_FLAG))
46 isImplicitlyPrivate = true;
48 AP.Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
51 // If the target flags on the operand changes the name of the symbol, do that
52 // before we return the symbol.
53 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB) {
55 const char *PGP = AP.MAI->getPrivateGlobalPrefix();
56 const char *Prefix = "";
57 if (!Name.startswith(PGP)) {
58 // http://llvm.org/bugs/show_bug.cgi?id=15763
59 // all stubs and lazy_ptrs should be local symbols, which need leading 'L'
62 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Twine(Prefix) + Twine(Name));
63 MachineModuleInfoImpl::StubValueTy &StubSym =
64 getMachOMMI(AP).getFnStubEntry(Sym);
65 if (StubSym.getPointer())
70 MachineModuleInfoImpl::
71 StubValueTy(AP.Mang->getSymbol(MO.getGlobal()),
72 !MO.getGlobal()->hasInternalLinkage());
74 Name.erase(Name.end()-5, Name.end());
76 MachineModuleInfoImpl::
77 StubValueTy(Ctx.GetOrCreateSymbol(Name.str()), false);
82 // If the symbol reference is actually to a non_lazy_ptr, not to the symbol,
83 // then add the suffix.
84 if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) {
85 Name += "$non_lazy_ptr";
86 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
88 MachineModuleInfoMachO &MachO = getMachOMMI(AP);
90 MachineModuleInfoImpl::StubValueTy &StubSym =
91 (MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ?
92 MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym);
94 if (StubSym.getPointer() == 0) {
95 assert(MO.isGlobal() && "Extern symbol not handled yet");
96 StubSym = MachineModuleInfoImpl::
97 StubValueTy(AP.Mang->getSymbol(MO.getGlobal()),
98 !MO.getGlobal()->hasInternalLinkage());
103 return Ctx.GetOrCreateSymbol(Name.str());
106 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
107 AsmPrinter &Printer, bool isDarwin) {
108 MCContext &Ctx = Printer.OutContext;
109 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
111 unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
114 case PPCII::MO_HA16: RefKind = isDarwin ?
115 MCSymbolRefExpr::VK_PPC_DARWIN_HA16 :
116 MCSymbolRefExpr::VK_PPC_GAS_HA16;
118 case PPCII::MO_LO16: RefKind = isDarwin ?
119 MCSymbolRefExpr::VK_PPC_DARWIN_LO16 :
120 MCSymbolRefExpr::VK_PPC_GAS_LO16;
122 case PPCII::MO_TPREL16_HA: RefKind = MCSymbolRefExpr::VK_PPC_TPREL16_HA;
124 case PPCII::MO_TPREL16_LO: RefKind = MCSymbolRefExpr::VK_PPC_TPREL16_LO;
126 case PPCII::MO_DTPREL16_LO: RefKind = MCSymbolRefExpr::VK_PPC_DTPREL16_LO;
128 case PPCII::MO_TLSLD16_LO: RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO;
130 case PPCII::MO_TOC16_LO: RefKind = MCSymbolRefExpr::VK_PPC_TOC16_LO;
134 // FIXME: This isn't right, but we don't have a good way to express this in
135 // the MC Level, see below.
136 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG)
137 RefKind = MCSymbolRefExpr::VK_None;
139 const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, RefKind, Ctx);
141 if (!MO.isJTI() && MO.getOffset())
142 Expr = MCBinaryExpr::CreateAdd(Expr,
143 MCConstantExpr::Create(MO.getOffset(), Ctx),
146 // Subtract off the PIC base if required.
147 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
148 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
150 const MCExpr *PB = MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx);
151 Expr = MCBinaryExpr::CreateSub(Expr, PB, Ctx);
152 // FIXME: We have no way to make the result be VK_PPC_LO16/VK_PPC_HA16,
153 // since it is not a symbol!
156 return MCOperand::CreateExpr(Expr);
159 void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
160 AsmPrinter &AP, bool isDarwin) {
161 OutMI.setOpcode(MI->getOpcode());
163 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
164 const MachineOperand &MO = MI->getOperand(i);
167 switch (MO.getType()) {
170 llvm_unreachable("unknown operand type");
171 case MachineOperand::MO_Register:
172 assert(!MO.getSubReg() && "Subregs should be eliminated!");
173 MCOp = MCOperand::CreateReg(MO.getReg());
175 case MachineOperand::MO_Immediate:
176 MCOp = MCOperand::CreateImm(MO.getImm());
178 case MachineOperand::MO_MachineBasicBlock:
179 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
180 MO.getMBB()->getSymbol(), AP.OutContext));
182 case MachineOperand::MO_GlobalAddress:
183 case MachineOperand::MO_ExternalSymbol:
184 MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
186 case MachineOperand::MO_JumpTableIndex:
187 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
189 case MachineOperand::MO_ConstantPoolIndex:
190 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
192 case MachineOperand::MO_BlockAddress:
193 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP,
196 case MachineOperand::MO_RegisterMask:
200 OutMI.addOperand(MCOp);