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/MachineModuleInfoImpls.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/Constants.h"
20 #include "llvm/CodeGen/MachineBasicBlock.h"
21 #include "llvm/MC/MCAsmInfo.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 //#include "llvm/MC/MCStreamer.h"
26 #include "llvm/Target/Mangler.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/ADT/SmallString.h"
33 const ARMSubtarget &ARMMCInstLower::getSubtarget() const {
34 return AsmPrinter.getSubtarget();
37 MachineModuleInfoMachO &ARMMCInstLower::getMachOMMI() const {
38 assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
39 return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
43 MCSymbol *ARMMCInstLower::
44 GetGlobalAddressSymbol(const MachineOperand &MO) const {
45 // FIXME: HANDLE PLT references how??
46 switch (MO.getTargetFlags()) {
47 default: assert(0 && "Unknown target flag on GV operand");
51 return Printer.Mang->getSymbol(MO.getGlobal());
54 MCSymbol *ARMMCInstLower::
55 GetExternalSymbolSymbol(const MachineOperand &MO) const {
56 // FIXME: HANDLE PLT references how??
57 switch (MO.getTargetFlags()) {
58 default: assert(0 && "Unknown target flag on GV operand");
62 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
67 MCSymbol *ARMMCInstLower::
68 GetJumpTableSymbol(const MachineOperand &MO) const {
69 SmallString<256> Name;
70 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
71 << Printer.getFunctionNumber() << '_' << MO.getIndex();
74 switch (MO.getTargetFlags()) {
75 default: llvm_unreachable("Unknown target flag on GV operand");
79 // Create a symbol for the name.
80 return Ctx.GetOrCreateSymbol(Name.str());
83 MCSymbol *ARMMCInstLower::
84 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
85 SmallString<256> Name;
86 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
87 << Printer.getFunctionNumber() << '_' << MO.getIndex();
90 switch (MO.getTargetFlags()) {
91 default: llvm_unreachable("Unknown target flag on GV operand");
95 // Create a symbol for the name.
96 return Ctx.GetOrCreateSymbol(Name.str());
99 MCOperand ARMMCInstLower::
100 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
101 // FIXME: We would like an efficient form for this, so we don't have to do a
102 // lot of extra uniquing.
103 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
106 switch (MO.getTargetFlags()) {
107 default: llvm_unreachable("Unknown target flag on GV operand");
111 if (!MO.isJTI() && MO.getOffset())
112 Expr = MCBinaryExpr::CreateAdd(Expr,
113 MCConstantExpr::Create(MO.getOffset(), Ctx),
115 return MCOperand::CreateExpr(Expr);
119 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
120 OutMI.setOpcode(MI->getOpcode());
122 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
123 const MachineOperand &MO = MI->getOperand(i);
126 switch (MO.getType()) {
129 assert(0 && "unknown operand type");
130 case MachineOperand::MO_Register:
131 // Ignore all non-CPSR implicit register operands.
132 if (MO.isImplicit() && MO.getReg() != ARM::CPSR) continue;
133 assert(!MO.getSubReg() && "Subregs should be eliminated!");
134 MCOp = MCOperand::CreateReg(MO.getReg());
136 case MachineOperand::MO_Immediate:
137 MCOp = MCOperand::CreateImm(MO.getImm());
139 case MachineOperand::MO_MachineBasicBlock:
140 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
141 MO.getMBB()->getSymbol(), Ctx));
143 case MachineOperand::MO_GlobalAddress:
144 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
146 case MachineOperand::MO_ExternalSymbol:
147 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
149 case MachineOperand::MO_JumpTableIndex:
150 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
152 case MachineOperand::MO_ConstantPoolIndex:
153 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
155 case MachineOperand::MO_BlockAddress:
156 MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
157 MO.getBlockAddress()));
159 case MachineOperand::MO_FPImmediate:
161 MCOperand::CreateFPImm(MO.getFPImm()->getValueAPF().convertToDouble());
165 OutMI.addOperand(MCOp);