1 //===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains code to lower PPC MachineInstrs to their corresponding
11 // MCInst records.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "PPC.h"
16 #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/IR/DataLayout.h"
24 #include "llvm/IR/GlobalValue.h"
25 #include "llvm/IR/Mangler.h"
26 #include "llvm/MC/MCAsmInfo.h"
27 #include "llvm/MC/MCExpr.h"
28 #include "llvm/MC/MCInst.h"
29 #include "llvm/Target/TargetLowering.h"
30 #include "llvm/Target/TargetLoweringObjectFile.h"
31 using namespace llvm;
32
getMachOMMI(AsmPrinter & AP)33 static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
34 return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
35 }
36
37
GetSymbolFromOperand(const MachineOperand & MO,AsmPrinter & AP)38 static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){
39 const TargetMachine &TM = AP.TM;
40 Mangler *Mang = AP.Mang;
41 const DataLayout &DL = AP.getDataLayout();
42 MCContext &Ctx = AP.OutContext;
43
44 SmallString<128> Name;
45 StringRef Suffix;
46 if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)
47 Suffix = "$non_lazy_ptr";
48
49 if (!Suffix.empty())
50 Name += DL.getPrivateGlobalPrefix();
51
52 if (!MO.isGlobal()) {
53 assert(MO.isSymbol() && "Isn't a symbol reference");
54 Mangler::getNameWithPrefix(Name, MO.getSymbolName(), DL);
55 } else {
56 const GlobalValue *GV = MO.getGlobal();
57 TM.getNameWithPrefix(Name, GV, *Mang);
58 }
59
60 Name += Suffix;
61 MCSymbol *Sym = Ctx.getOrCreateSymbol(Name);
62
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);
67
68 MachineModuleInfoImpl::StubValueTy &StubSym = MachO.getGVStubEntry(Sym);
69
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());
75 }
76 return Sym;
77 }
78
79 return Sym;
80 }
81
GetSymbolRef(const MachineOperand & MO,const MCSymbol * Symbol,AsmPrinter & Printer,bool isDarwin)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;
86
87 unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
88
89 switch (access) {
90 case PPCII::MO_TPREL_LO:
91 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO;
92 break;
93 case PPCII::MO_TPREL_HA:
94 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA;
95 break;
96 case PPCII::MO_DTPREL_LO:
97 RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO;
98 break;
99 case PPCII::MO_TLSLD_LO:
100 RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO;
101 break;
102 case PPCII::MO_TOC_LO:
103 RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO;
104 break;
105 case PPCII::MO_TLS:
106 RefKind = MCSymbolRefExpr::VK_PPC_TLS;
107 break;
108 }
109
110 if (MO.getTargetFlags() == PPCII::MO_PLT)
111 RefKind = MCSymbolRefExpr::VK_PLT;
112
113 const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, RefKind, Ctx);
114
115 if (!MO.isJTI() && MO.getOffset())
116 Expr = MCBinaryExpr::createAdd(Expr,
117 MCConstantExpr::create(MO.getOffset(), Ctx),
118 Ctx);
119
120 // Subtract off the PIC base if required.
121 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
122 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
123
124 const MCExpr *PB = MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
125 Expr = MCBinaryExpr::createSub(Expr, PB, Ctx);
126 }
127
128 // Add ha16() / lo16() markers if required.
129 switch (access) {
130 case PPCII::MO_LO:
131 Expr = PPCMCExpr::createLo(Expr, isDarwin, Ctx);
132 break;
133 case PPCII::MO_HA:
134 Expr = PPCMCExpr::createHa(Expr, isDarwin, Ctx);
135 break;
136 }
137
138 return MCOperand::createExpr(Expr);
139 }
140
LowerPPCMachineInstrToMCInst(const MachineInstr * MI,MCInst & OutMI,AsmPrinter & AP,bool isDarwin)141 void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
142 AsmPrinter &AP, bool isDarwin) {
143 OutMI.setOpcode(MI->getOpcode());
144
145 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
146 const MachineOperand &MO = MI->getOperand(i);
147
148 MCOperand MCOp;
149 switch (MO.getType()) {
150 default:
151 MI->dump();
152 llvm_unreachable("unknown operand type");
153 case MachineOperand::MO_Register:
154 assert(!MO.getSubReg() && "Subregs should be eliminated!");
155 assert(MO.getReg() > PPC::NoRegister &&
156 MO.getReg() < PPC::NUM_TARGET_REGS &&
157 "Invalid register for this target!");
158 MCOp = MCOperand::createReg(MO.getReg());
159 break;
160 case MachineOperand::MO_Immediate:
161 MCOp = MCOperand::createImm(MO.getImm());
162 break;
163 case MachineOperand::MO_MachineBasicBlock:
164 MCOp = MCOperand::createExpr(MCSymbolRefExpr::create(
165 MO.getMBB()->getSymbol(), AP.OutContext));
166 break;
167 case MachineOperand::MO_GlobalAddress:
168 case MachineOperand::MO_ExternalSymbol:
169 MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
170 break;
171 case MachineOperand::MO_JumpTableIndex:
172 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
173 break;
174 case MachineOperand::MO_ConstantPoolIndex:
175 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
176 break;
177 case MachineOperand::MO_BlockAddress:
178 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP,
179 isDarwin);
180 break;
181 case MachineOperand::MO_RegisterMask:
182 continue;
183 }
184
185 OutMI.addOperand(MCOp);
186 }
187 }
188