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/MachineInstr.h"
18 #include "llvm/MC/MCAsmInfo.h"
19 #include "llvm/MC/MCContext.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCInst.h"
22 //#include "llvm/MC/MCStreamer.h"
23 #include "llvm/Support/raw_ostream.h"
24 #include "llvm/Support/Mangler.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 const GlobalValue *GV = MO.getGlobal();
44 SmallString<128> Name;
45 Mang.getNameWithPrefix(Name, GV, false);
47 // FIXME: HANDLE PLT references how??
48 switch (MO.getTargetFlags()) {
49 default: assert(0 && "Unknown target flag on GV operand");
53 return Ctx.GetOrCreateSymbol(Name.str());
57 MCSymbol *ARMMCInstLower::
58 GetJumpTableSymbol(const MachineOperand &MO) const {
59 SmallString<256> Name;
60 raw_svector_ostream(Name) << MAI.getPrivateGlobalPrefix() << "JTI"
61 << CurFunctionNumber << '_' << MO.getIndex();
64 switch (MO.getTargetFlags()) {
65 default: llvm_unreachable("Unknown target flag on GV operand");
69 // Create a symbol for the name.
70 return Ctx.GetOrCreateSymbol(Name.str());
73 MCSymbol *ARMMCInstLower::
74 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
75 SmallString<256> Name;
76 raw_svector_ostream(Name) << MAI.getPrivateGlobalPrefix() << "CPI"
77 << CurFunctionNumber << '_' << MO.getIndex();
80 switch (MO.getTargetFlags()) {
81 default: llvm_unreachable("Unknown target flag on GV operand");
85 // Create a symbol for the name.
86 return Ctx.GetOrCreateSymbol(Name.str());
89 MCOperand ARMMCInstLower::
90 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
91 // FIXME: We would like an efficient form for this, so we don't have to do a
92 // lot of extra uniquing.
93 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
96 switch (MO.getTargetFlags()) {
97 default: llvm_unreachable("Unknown target flag on GV operand");
101 if (!MO.isJTI() && MO.getOffset())
102 Expr = MCBinaryExpr::CreateAdd(Expr,
103 MCConstantExpr::Create(MO.getOffset(), Ctx),
105 return MCOperand::CreateExpr(Expr);
109 void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
110 OutMI.setOpcode(MI->getOpcode());
112 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
113 const MachineOperand &MO = MI->getOperand(i);
116 switch (MO.getType()) {
119 assert(0 && "unknown operand type");
120 case MachineOperand::MO_Register:
121 MCOp = MCOperand::CreateReg(MO.getReg());
123 case MachineOperand::MO_Immediate:
124 MCOp = MCOperand::CreateImm(MO.getImm());
127 case MachineOperand::MO_MachineBasicBlock:
128 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
129 AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
132 case MachineOperand::MO_GlobalAddress:
133 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
136 case MachineOperand::MO_ExternalSymbol:
137 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
140 case MachineOperand::MO_JumpTableIndex:
141 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
143 case MachineOperand::MO_ConstantPoolIndex:
144 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
148 OutMI.addOperand(MCOp);