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/ADT/SmallString.h"
30 const ARMSubtarget &ARMMCInstLower::getSubtarget() const {
31 return AsmPrinter.getSubtarget();
34 MachineModuleInfoMachO &ARMMCInstLower::getMachOMMI() const {
35 assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
36 return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
40 MCSymbol *ARMMCInstLower::
41 GetGlobalAddressSymbol(const MachineOperand &MO) const {
42 // FIXME: HANDLE PLT references how??
43 switch (MO.getTargetFlags()) {
44 default: assert(0 && "Unknown target flag on GV operand");
48 return Printer.GetGlobalValueSymbol(MO.getGlobal());
51 MCSymbol *ARMMCInstLower::
52 GetExternalSymbolSymbol(const MachineOperand &MO) const {
53 // FIXME: HANDLE PLT references how??
54 switch (MO.getTargetFlags()) {
55 default: assert(0 && "Unknown target flag on GV operand");
59 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
64 MCSymbol *ARMMCInstLower::
65 GetJumpTableSymbol(const MachineOperand &MO) const {
66 SmallString<256> Name;
67 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
68 << Printer.getFunctionNumber() << '_' << MO.getIndex();
71 switch (MO.getTargetFlags()) {
72 default: llvm_unreachable("Unknown target flag on GV operand");
76 // Create a symbol for the name.
77 return Ctx.GetOrCreateSymbol(Name.str());
80 MCSymbol *ARMMCInstLower::
81 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
82 SmallString<256> Name;
83 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
84 << Printer.getFunctionNumber() << '_' << MO.getIndex();
87 switch (MO.getTargetFlags()) {
88 default: llvm_unreachable("Unknown target flag on GV operand");
92 // Create a symbol for the name.
93 return Ctx.GetOrCreateSymbol(Name.str());
96 MCOperand ARMMCInstLower::
97 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
98 // FIXME: We would like an efficient form for this, so we don't have to do a
99 // lot of extra uniquing.
100 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
103 switch (MO.getTargetFlags()) {
104 default: llvm_unreachable("Unknown target flag on GV operand");
108 if (!MO.isJTI() && MO.getOffset())
109 Expr = MCBinaryExpr::CreateAdd(Expr,
110 MCConstantExpr::Create(MO.getOffset(), Ctx),
112 return MCOperand::CreateExpr(Expr);
116 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
117 OutMI.setOpcode(MI->getOpcode());
119 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
120 const MachineOperand &MO = MI->getOperand(i);
123 switch (MO.getType()) {
126 assert(0 && "unknown operand type");
127 case MachineOperand::MO_Register:
128 // Ignore all implicit register operands.
129 if (MO.isImplicit()) continue;
130 assert(!MO.getSubReg() && "Subregs should be eliminated!");
131 MCOp = MCOperand::CreateReg(MO.getReg());
133 case MachineOperand::MO_Immediate:
134 MCOp = MCOperand::CreateImm(MO.getImm());
136 case MachineOperand::MO_MachineBasicBlock:
137 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
138 Printer.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
140 case MachineOperand::MO_GlobalAddress:
141 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
143 case MachineOperand::MO_ExternalSymbol:
144 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
146 case MachineOperand::MO_JumpTableIndex:
147 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
149 case MachineOperand::MO_ConstantPoolIndex:
150 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
152 case MachineOperand::MO_BlockAddress:
153 MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
154 MO.getBlockAddress()));
158 OutMI.addOperand(MCOp);