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 //===----------------------------------------------------------------------===//
15 #include "ARMMCInstLower.h"
17 #include "llvm/CodeGen/AsmPrinter.h"
18 #include "llvm/Constants.h"
19 #include "llvm/CodeGen/MachineBasicBlock.h"
20 #include "llvm/MC/MCAsmInfo.h"
21 #include "llvm/MC/MCContext.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/Target/Mangler.h"
25 #include "llvm/Support/raw_ostream.h"
26 #include "llvm/ADT/SmallString.h"
29 MCSymbol *ARMMCInstLower::GetGlobalAddressSymbol(const GlobalValue *GV) const {
30 return Printer.Mang->getSymbol(GV);
33 const MCSymbolRefExpr *ARMMCInstLower::
34 GetSymbolRef(const MachineOperand &MO) const {
35 assert(MO.isGlobal() && "Isn't a global address reference?");
37 const MCSymbolRefExpr *SymRef;
38 const MCSymbol *Symbol = GetGlobalAddressSymbol(MO.getGlobal());
40 switch (MO.getTargetFlags()) {
41 default: assert(0 && "Unknown target flag on GV operand");
43 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
46 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
49 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_HI16, Ctx);
52 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_PLT, Ctx);
59 const MCSymbolRefExpr *ARMMCInstLower::
60 GetExternalSymbolSymbol(const MachineOperand &MO) const {
61 const MCSymbolRefExpr *SymRef;
62 const MCSymbol *Symbol = Printer.GetExternalSymbolSymbol(MO.getSymbolName());
64 switch (MO.getTargetFlags()) {
65 default: assert(0 && "Unknown target flag on external symbol operand");
67 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
70 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
73 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_HI16, Ctx);
76 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_PLT, Ctx);
85 const MCSymbolRefExpr *ARMMCInstLower::
86 GetJumpTableSymbol(const MachineOperand &MO) const {
87 SmallString<256> Name;
88 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
89 << Printer.getFunctionNumber() << '_' << MO.getIndex();
91 switch (MO.getTargetFlags()) {
92 default: assert(0 && "Unknown target flag on jump table operand");
96 // Create a symbol for the name.
97 return MCSymbolRefExpr::Create(Ctx.GetOrCreateSymbol(Name.str()), Ctx);
100 const MCSymbolRefExpr *ARMMCInstLower::
101 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
102 SmallString<256> Name;
103 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
104 << Printer.getFunctionNumber() << '_' << MO.getIndex();
106 switch (MO.getTargetFlags()) {
107 default: assert(0 && "Unknown target flag on CPI operand");
111 // Create a symbol for the name.
112 return MCSymbolRefExpr::Create(Ctx.GetOrCreateSymbol(Name.str()), Ctx);
115 MCOperand ARMMCInstLower::
116 LowerSymbolRefOperand(const MachineOperand &MO,
117 const MCSymbolRefExpr *Sym) const {
118 const MCExpr *Expr = Sym;
119 if (!MO.isJTI() && MO.getOffset())
120 Expr = MCBinaryExpr::CreateAdd(Expr,
121 MCConstantExpr::Create(MO.getOffset(), Ctx),
123 return MCOperand::CreateExpr(Expr);
127 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
128 OutMI.setOpcode(MI->getOpcode());
130 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
131 const MachineOperand &MO = MI->getOperand(i);
134 switch (MO.getType()) {
137 assert(0 && "unknown operand type");
138 case MachineOperand::MO_Register:
139 // Ignore all non-CPSR implicit register operands.
140 if (MO.isImplicit() && MO.getReg() != ARM::CPSR) continue;
141 assert(!MO.getSubReg() && "Subregs should be eliminated!");
142 MCOp = MCOperand::CreateReg(MO.getReg());
144 case MachineOperand::MO_Immediate:
145 MCOp = MCOperand::CreateImm(MO.getImm());
147 case MachineOperand::MO_MachineBasicBlock:
148 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
149 MO.getMBB()->getSymbol(), Ctx));
151 case MachineOperand::MO_GlobalAddress:
152 MCOp = LowerSymbolRefOperand(MO, GetSymbolRef(MO));
154 case MachineOperand::MO_ExternalSymbol:
155 MCOp = LowerSymbolRefOperand(MO, GetExternalSymbolSymbol(MO));
157 case MachineOperand::MO_JumpTableIndex:
158 MCOp = LowerSymbolRefOperand(MO, GetJumpTableSymbol(MO));
160 case MachineOperand::MO_ConstantPoolIndex:
161 MCOp = LowerSymbolRefOperand(MO, GetConstantPoolIndexSymbol(MO));
163 case MachineOperand::MO_BlockAddress:
164 MCOp = LowerSymbolRefOperand(MO,
165 MCSymbolRefExpr::Create(Printer.GetBlockAddressSymbol(
166 MO.getBlockAddress()), Ctx));
168 case MachineOperand::MO_FPImmediate:
169 APFloat Val = MO.getFPImm()->getValueAPF();
171 Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
172 MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
176 OutMI.addOperand(MCOp);