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/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?");
36 // FIXME: HANDLE PLT references how??
38 const MCSymbolRefExpr *SymRef;
39 const MCSymbol *Symbol = GetGlobalAddressSymbol(MO.getGlobal());
41 switch (MO.getTargetFlags()) {
42 default: assert(0 && "Unknown target flag on GV operand");
44 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
47 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
50 SymRef = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_HI16, Ctx);
57 MCSymbol *ARMMCInstLower::
58 GetExternalSymbolSymbol(const MachineOperand &MO) const {
59 // FIXME: HANDLE PLT references how??
60 // FIXME: This probably needs to be merged with the above SymbolRef stuff
61 // to handle :lower16: and :upper16: (?)
62 switch (MO.getTargetFlags()) {
63 default: assert(0 && "Unknown target flag on GV operand");
67 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
72 MCSymbol *ARMMCInstLower::
73 GetJumpTableSymbol(const MachineOperand &MO) const {
74 SmallString<256> Name;
75 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
76 << Printer.getFunctionNumber() << '_' << MO.getIndex();
78 switch (MO.getTargetFlags()) {
79 default: assert(0 && "Unknown target flag on jump table operand");
83 // Create a symbol for the name.
84 return Ctx.GetOrCreateSymbol(Name.str());
87 MCSymbol *ARMMCInstLower::
88 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
89 SmallString<256> Name;
90 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
91 << Printer.getFunctionNumber() << '_' << MO.getIndex();
93 switch (MO.getTargetFlags()) {
94 default: assert(0 && "Unknown target flag on CPI operand");
98 // Create a symbol for the name.
99 return Ctx.GetOrCreateSymbol(Name.str());
102 MCOperand ARMMCInstLower::
103 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
104 // FIXME: We would like an efficient form for this, so we don't have to do a
105 // lot of extra uniquing.
106 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
108 switch (MO.getTargetFlags()) {
109 default: assert(0 && "Unknown target flag on Symbol operand");
113 if (!MO.isJTI() && MO.getOffset())
114 Expr = MCBinaryExpr::CreateAdd(Expr,
115 MCConstantExpr::Create(MO.getOffset(), Ctx),
117 return MCOperand::CreateExpr(Expr);
120 MCOperand ARMMCInstLower::
121 LowerSymbolRefOperand(const MachineOperand &MO,
122 const MCSymbolRefExpr *Sym) const {
123 const MCExpr *Expr = Sym;
124 if (!MO.isJTI() && MO.getOffset())
125 Expr = MCBinaryExpr::CreateAdd(Expr,
126 MCConstantExpr::Create(MO.getOffset(), Ctx),
128 return MCOperand::CreateExpr(Expr);
132 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
133 OutMI.setOpcode(MI->getOpcode());
135 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
136 const MachineOperand &MO = MI->getOperand(i);
139 switch (MO.getType()) {
142 assert(0 && "unknown operand type");
143 case MachineOperand::MO_Register:
144 // Ignore all non-CPSR implicit register operands.
145 if (MO.isImplicit() && MO.getReg() != ARM::CPSR) continue;
146 assert(!MO.getSubReg() && "Subregs should be eliminated!");
147 MCOp = MCOperand::CreateReg(MO.getReg());
149 case MachineOperand::MO_Immediate:
150 MCOp = MCOperand::CreateImm(MO.getImm());
152 case MachineOperand::MO_MachineBasicBlock:
153 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
154 MO.getMBB()->getSymbol(), Ctx));
156 case MachineOperand::MO_GlobalAddress:
157 MCOp = LowerSymbolRefOperand(MO, GetSymbolRef(MO));
159 case MachineOperand::MO_ExternalSymbol:
160 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
162 case MachineOperand::MO_JumpTableIndex:
163 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
165 case MachineOperand::MO_ConstantPoolIndex:
166 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
168 case MachineOperand::MO_BlockAddress:
169 MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
170 MO.getBlockAddress()));
172 case MachineOperand::MO_FPImmediate:
173 APFloat Val = MO.getFPImm()->getValueAPF();
175 Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
176 MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
180 OutMI.addOperand(MCOp);