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/Target/Mangler.h"
25 #include "llvm/Support/raw_ostream.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 // FIXME: HANDLE PLT references how??
44 switch (MO.getTargetFlags()) {
45 default: assert(0 && "Unknown target flag on GV operand");
49 return Printer.Mang->getSymbol(MO.getGlobal());
52 MCSymbol *ARMMCInstLower::
53 GetExternalSymbolSymbol(const MachineOperand &MO) const {
54 // FIXME: HANDLE PLT references how??
55 switch (MO.getTargetFlags()) {
56 default: assert(0 && "Unknown target flag on GV operand");
60 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
65 MCSymbol *ARMMCInstLower::
66 GetJumpTableSymbol(const MachineOperand &MO) const {
67 SmallString<256> Name;
68 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
69 << Printer.getFunctionNumber() << '_' << MO.getIndex();
72 switch (MO.getTargetFlags()) {
73 default: llvm_unreachable("Unknown target flag on GV operand");
77 // Create a symbol for the name.
78 return Ctx.GetOrCreateTemporarySymbol(Name.str());
81 MCSymbol *ARMMCInstLower::
82 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
83 SmallString<256> Name;
84 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
85 << Printer.getFunctionNumber() << '_' << MO.getIndex();
88 switch (MO.getTargetFlags()) {
89 default: llvm_unreachable("Unknown target flag on GV operand");
93 // Create a symbol for the name.
94 return Ctx.GetOrCreateTemporarySymbol(Name.str());
97 MCOperand ARMMCInstLower::
98 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
99 // FIXME: We would like an efficient form for this, so we don't have to do a
100 // lot of extra uniquing.
101 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
104 switch (MO.getTargetFlags()) {
105 default: llvm_unreachable("Unknown target flag on GV operand");
109 if (!MO.isJTI() && MO.getOffset())
110 Expr = MCBinaryExpr::CreateAdd(Expr,
111 MCConstantExpr::Create(MO.getOffset(), Ctx),
113 return MCOperand::CreateExpr(Expr);
117 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
118 OutMI.setOpcode(MI->getOpcode());
120 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
121 const MachineOperand &MO = MI->getOperand(i);
124 switch (MO.getType()) {
127 assert(0 && "unknown operand type");
128 case MachineOperand::MO_Register:
129 // Ignore all implicit register operands.
130 if (MO.isImplicit()) continue;
131 assert(!MO.getSubReg() && "Subregs should be eliminated!");
132 MCOp = MCOperand::CreateReg(MO.getReg());
134 case MachineOperand::MO_Immediate:
135 MCOp = MCOperand::CreateImm(MO.getImm());
137 case MachineOperand::MO_MachineBasicBlock:
138 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
139 MO.getMBB()->getSymbol(), Ctx));
141 case MachineOperand::MO_GlobalAddress:
142 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
144 case MachineOperand::MO_ExternalSymbol:
145 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
147 case MachineOperand::MO_JumpTableIndex:
148 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
150 case MachineOperand::MO_ConstantPoolIndex:
151 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
153 case MachineOperand::MO_BlockAddress:
154 MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
155 MO.getBlockAddress()));
159 OutMI.addOperand(MCOp);