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"
16 //#include "llvm/CodeGen/MachineModuleInfoImpls.h"
17 #include "llvm/CodeGen/AsmPrinter.h"
18 #include "llvm/CodeGen/MachineBasicBlock.h"
19 #include "llvm/MC/MCAsmInfo.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
23 //#include "llvm/MC/MCStreamer.h"
24 #include "llvm/Support/raw_ostream.h"
25 #include "llvm/Support/Mangler.h"
26 #include "llvm/ADT/SmallString.h"
31 const ARMSubtarget &ARMMCInstLower::getSubtarget() const {
32 return AsmPrinter.getSubtarget();
35 MachineModuleInfoMachO &ARMMCInstLower::getMachOMMI() const {
36 assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
37 return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
41 MCSymbol *ARMMCInstLower::
42 GetGlobalAddressSymbol(const MachineOperand &MO) const {
43 const GlobalValue *GV = MO.getGlobal();
45 SmallString<128> Name;
46 Mang.getNameWithPrefix(Name, GV, false);
48 // FIXME: HANDLE PLT references how??
49 switch (MO.getTargetFlags()) {
50 default: assert(0 && "Unknown target flag on GV operand");
54 return Ctx.GetOrCreateSymbol(Name.str());
57 MCSymbol *ARMMCInstLower::
58 GetExternalSymbolSymbol(const MachineOperand &MO) const {
59 SmallString<128> Name;
60 Name += Printer.MAI->getGlobalPrefix();
61 Name += MO.getSymbolName();
63 // FIXME: HANDLE PLT references how??
64 switch (MO.getTargetFlags()) {
65 default: assert(0 && "Unknown target flag on GV operand");
69 return Ctx.GetOrCreateSymbol(Name.str());
74 MCSymbol *ARMMCInstLower::
75 GetJumpTableSymbol(const MachineOperand &MO) const {
76 SmallString<256> Name;
77 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
78 << Printer.getFunctionNumber() << '_' << MO.getIndex();
81 switch (MO.getTargetFlags()) {
82 default: llvm_unreachable("Unknown target flag on GV operand");
86 // Create a symbol for the name.
87 return Ctx.GetOrCreateSymbol(Name.str());
90 MCSymbol *ARMMCInstLower::
91 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
92 SmallString<256> Name;
93 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
94 << Printer.getFunctionNumber() << '_' << MO.getIndex();
97 switch (MO.getTargetFlags()) {
98 default: llvm_unreachable("Unknown target flag on GV operand");
102 // Create a symbol for the name.
103 return Ctx.GetOrCreateSymbol(Name.str());
106 MCOperand ARMMCInstLower::
107 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
108 // FIXME: We would like an efficient form for this, so we don't have to do a
109 // lot of extra uniquing.
110 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
113 switch (MO.getTargetFlags()) {
114 default: llvm_unreachable("Unknown target flag on GV operand");
118 if (!MO.isJTI() && MO.getOffset())
119 Expr = MCBinaryExpr::CreateAdd(Expr,
120 MCConstantExpr::Create(MO.getOffset(), Ctx),
122 return MCOperand::CreateExpr(Expr);
126 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
127 OutMI.setOpcode(MI->getOpcode());
129 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
130 const MachineOperand &MO = MI->getOperand(i);
133 switch (MO.getType()) {
136 assert(0 && "unknown operand type");
137 case MachineOperand::MO_Register:
138 // Ignore all implicit register operands.
139 if (MO.isImplicit()) continue;
140 MCOp = MCOperand::CreateReg(MO.getReg());
142 case MachineOperand::MO_Immediate:
143 MCOp = MCOperand::CreateImm(MO.getImm());
145 case MachineOperand::MO_MachineBasicBlock:
146 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
147 Printer.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
149 case MachineOperand::MO_GlobalAddress:
150 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
152 case MachineOperand::MO_ExternalSymbol:
153 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
155 case MachineOperand::MO_JumpTableIndex:
156 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
158 case MachineOperand::MO_ConstantPoolIndex:
159 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
163 OutMI.addOperand(MCOp);