1 //===-- MSP430MCInstLower.cpp - Convert MSP430 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 MSP430 MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "MSP430MCInstLower.h"
16 #include "llvm/CodeGen/AsmPrinter.h"
17 #include "llvm/CodeGen/MachineBasicBlock.h"
18 #include "llvm/CodeGen/MachineInstr.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/Support/raw_ostream.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/ADT/SmallString.h"
28 MCSymbol *MSP430MCInstLower::
29 GetGlobalAddressSymbol(const MachineOperand &MO) const {
30 switch (MO.getTargetFlags()) {
31 default: llvm_unreachable("Unknown target flag on GV operand");
35 return Printer.GetGlobalValueSymbol(MO.getGlobal());
38 MCSymbol *MSP430MCInstLower::
39 GetExternalSymbolSymbol(const MachineOperand &MO) const {
40 switch (MO.getTargetFlags()) {
41 default: assert(0 && "Unknown target flag on GV operand");
45 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
48 MCSymbol *MSP430MCInstLower::
49 GetJumpTableSymbol(const MachineOperand &MO) const {
50 SmallString<256> Name;
51 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
52 << Printer.getFunctionNumber() << '_'
55 switch (MO.getTargetFlags()) {
56 default: llvm_unreachable("Unknown target flag on GV operand");
60 // Create a symbol for the name.
61 return Ctx.GetOrCreateSymbol(Name.str());
64 MCSymbol *MSP430MCInstLower::
65 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
66 SmallString<256> Name;
67 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
68 << Printer.getFunctionNumber() << '_'
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 MCOperand MSP430MCInstLower::
81 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
82 // FIXME: We would like an efficient form for this, so we don't have to do a
83 // lot of extra uniquing.
84 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
86 switch (MO.getTargetFlags()) {
87 default: llvm_unreachable("Unknown target flag on GV operand");
91 if (!MO.isJTI() && MO.getOffset())
92 Expr = MCBinaryExpr::CreateAdd(Expr,
93 MCConstantExpr::Create(MO.getOffset(), Ctx),
95 return MCOperand::CreateExpr(Expr);
98 void MSP430MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
99 OutMI.setOpcode(MI->getOpcode());
101 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
102 const MachineOperand &MO = MI->getOperand(i);
105 switch (MO.getType()) {
108 assert(0 && "unknown operand type");
109 case MachineOperand::MO_Register:
110 // Ignore all implicit register operands.
111 if (MO.isImplicit()) continue;
112 MCOp = MCOperand::CreateReg(MO.getReg());
114 case MachineOperand::MO_Immediate:
115 MCOp = MCOperand::CreateImm(MO.getImm());
117 case MachineOperand::MO_MachineBasicBlock:
118 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
119 MO.getMBB()->getSymbol(Printer.OutContext), Ctx));
121 case MachineOperand::MO_GlobalAddress:
122 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
124 case MachineOperand::MO_ExternalSymbol:
125 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
127 case MachineOperand::MO_JumpTableIndex:
128 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
130 case MachineOperand::MO_ConstantPoolIndex:
131 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
135 OutMI.addOperand(MCOp);