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/Target/Mangler.h"
24 #include "llvm/Support/raw_ostream.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/ADT/SmallString.h"
29 MCSymbol *MSP430MCInstLower::
30 GetGlobalAddressSymbol(const MachineOperand &MO) const {
31 switch (MO.getTargetFlags()) {
32 default: llvm_unreachable("Unknown target flag on GV operand");
36 return Printer.Mang->getSymbol(MO.getGlobal());
39 MCSymbol *MSP430MCInstLower::
40 GetExternalSymbolSymbol(const MachineOperand &MO) const {
41 switch (MO.getTargetFlags()) {
42 default: assert(0 && "Unknown target flag on GV operand");
46 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
49 MCSymbol *MSP430MCInstLower::
50 GetJumpTableSymbol(const MachineOperand &MO) const {
51 SmallString<256> Name;
52 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
53 << Printer.getFunctionNumber() << '_'
56 switch (MO.getTargetFlags()) {
57 default: llvm_unreachable("Unknown target flag on GV operand");
61 // Create a symbol for the name.
62 return Ctx.GetOrCreateSymbol(Name.str());
65 MCSymbol *MSP430MCInstLower::
66 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
67 SmallString<256> Name;
68 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
69 << Printer.getFunctionNumber() << '_'
72 switch (MO.getTargetFlags()) {
73 default: llvm_unreachable("Unknown target flag on GV operand");
77 // Create a symbol for the name.
78 return Ctx.GetOrCreateSymbol(Name.str());
81 MCSymbol *MSP430MCInstLower::
82 GetBlockAddressSymbol(const MachineOperand &MO) const {
83 switch (MO.getTargetFlags()) {
84 default: assert(0 && "Unknown target flag on GV operand");
88 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
91 MCOperand MSP430MCInstLower::
92 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
93 // FIXME: We would like an efficient form for this, so we don't have to do a
94 // lot of extra uniquing.
95 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
97 switch (MO.getTargetFlags()) {
98 default: llvm_unreachable("Unknown target flag on GV operand");
102 if (!MO.isJTI() && MO.getOffset())
103 Expr = MCBinaryExpr::CreateAdd(Expr,
104 MCConstantExpr::Create(MO.getOffset(), Ctx),
106 return MCOperand::CreateExpr(Expr);
109 void MSP430MCInstLower::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 // Ignore all implicit register operands.
122 if (MO.isImplicit()) continue;
123 MCOp = MCOperand::CreateReg(MO.getReg());
125 case MachineOperand::MO_Immediate:
126 MCOp = MCOperand::CreateImm(MO.getImm());
128 case MachineOperand::MO_MachineBasicBlock:
129 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
130 MO.getMBB()->getSymbol(), Ctx));
132 case MachineOperand::MO_GlobalAddress:
133 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
135 case MachineOperand::MO_ExternalSymbol:
136 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
138 case MachineOperand::MO_JumpTableIndex:
139 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
141 case MachineOperand::MO_ConstantPoolIndex:
142 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
144 case MachineOperand::MO_BlockAddress:
145 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
148 OutMI.addOperand(MCOp);