1 //===-- ARMMCInstLower.cpp - Convert ARM 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 ARM MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
16 #include "ARMMCInstLower.h"
17 //#include "llvm/CodeGen/MachineModuleInfoImpls.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/Constants.h"
20 #include "llvm/CodeGen/MachineBasicBlock.h"
21 #include "llvm/MC/MCAsmInfo.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 //#include "llvm/MC/MCStreamer.h"
26 #include "llvm/Target/Mangler.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/ADT/SmallString.h"
33 const ARMSubtarget &ARMMCInstLower::getSubtarget() const {
34 return AsmPrinter.getSubtarget();
37 MachineModuleInfoMachO &ARMMCInstLower::getMachOMMI() const {
38 assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
39 return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
43 MCSymbol *ARMMCInstLower::GetGlobalAddressSymbol(const GlobalValue *GV) const {
44 return Printer.Mang->getSymbol(GV);
47 const MCSymbolRefExpr *ARMMCInstLower::
48 GetSymbolRef(const MachineOperand &MO) const {
49 assert(MO.isGlobal() && "Isn't a global address reference?");
50 // FIXME: HANDLE PLT references how??
52 const MCSymbolRefExpr *SymRef;
53 const MCSymbol *Symbol = GetGlobalAddressSymbol(MO.getGlobal());
55 switch (MO.getTargetFlags()) {
56 default: assert(0 && "Unknown target flag on GV operand");
58 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
61 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
64 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_HI16, Ctx);
71 MCSymbol *ARMMCInstLower::
72 GetExternalSymbolSymbol(const MachineOperand &MO) const {
73 // FIXME: HANDLE PLT references how??
74 // FIXME: This probably needs to be merged with the above SymbolRef stuff
75 // to handle :lower16: and :upper16: (?)
76 switch (MO.getTargetFlags()) {
77 default: assert(0 && "Unknown target flag on GV operand");
81 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
86 MCSymbol *ARMMCInstLower::
87 GetJumpTableSymbol(const MachineOperand &MO) const {
88 SmallString<256> Name;
89 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
90 << Printer.getFunctionNumber() << '_' << MO.getIndex();
93 switch (MO.getTargetFlags()) {
94 default: llvm_unreachable("Unknown target flag on GV operand");
98 // Create a symbol for the name.
99 return Ctx.GetOrCreateSymbol(Name.str());
102 MCSymbol *ARMMCInstLower::
103 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
104 SmallString<256> Name;
105 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
106 << Printer.getFunctionNumber() << '_' << MO.getIndex();
109 switch (MO.getTargetFlags()) {
110 default: llvm_unreachable("Unknown target flag on GV operand");
114 // Create a symbol for the name.
115 return Ctx.GetOrCreateSymbol(Name.str());
118 MCOperand ARMMCInstLower::
119 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
120 // FIXME: We would like an efficient form for this, so we don't have to do a
121 // lot of extra uniquing.
122 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
125 switch (MO.getTargetFlags()) {
126 default: llvm_unreachable("Unknown target flag on GV operand");
130 if (!MO.isJTI() && MO.getOffset())
131 Expr = MCBinaryExpr::CreateAdd(Expr,
132 MCConstantExpr::Create(MO.getOffset(), Ctx),
134 return MCOperand::CreateExpr(Expr);
137 MCOperand ARMMCInstLower::
138 LowerSymbolRefOperand(const MachineOperand &MO,
139 const MCSymbolRefExpr *Sym) const {
140 const MCExpr *Expr = Sym;
141 if (!MO.isJTI() && MO.getOffset())
142 Expr = MCBinaryExpr::CreateAdd(Expr,
143 MCConstantExpr::Create(MO.getOffset(), Ctx),
145 return MCOperand::CreateExpr(Expr);
149 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
150 OutMI.setOpcode(MI->getOpcode());
152 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
153 const MachineOperand &MO = MI->getOperand(i);
156 switch (MO.getType()) {
159 assert(0 && "unknown operand type");
160 case MachineOperand::MO_Register:
161 // Ignore all non-CPSR implicit register operands.
162 if (MO.isImplicit() && MO.getReg() != ARM::CPSR) continue;
163 assert(!MO.getSubReg() && "Subregs should be eliminated!");
164 MCOp = MCOperand::CreateReg(MO.getReg());
166 case MachineOperand::MO_Immediate:
167 MCOp = MCOperand::CreateImm(MO.getImm());
169 case MachineOperand::MO_MachineBasicBlock:
170 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
171 MO.getMBB()->getSymbol(), Ctx));
173 case MachineOperand::MO_GlobalAddress:
174 MCOp = LowerSymbolRefOperand(MO, GetSymbolRef(MO));
176 case MachineOperand::MO_ExternalSymbol:
177 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
179 case MachineOperand::MO_JumpTableIndex:
180 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
182 case MachineOperand::MO_ConstantPoolIndex:
183 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
185 case MachineOperand::MO_BlockAddress:
186 MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
187 MO.getBlockAddress()));
189 case MachineOperand::MO_FPImmediate:
190 APFloat Val = MO.getFPImm()->getValueAPF();
192 Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
193 MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
197 OutMI.addOperand(MCOp);