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/Support/Mangler.h"
26 #include "llvm/ADT/SmallString.h"
29 MCSymbol *MSP430MCInstLower::
30 GetGlobalAddressSymbol(const MachineOperand &MO) const {
31 const GlobalValue *GV = MO.getGlobal();
33 SmallString<128> Name;
34 Mang.getNameWithPrefix(Name, GV, false);
36 switch (MO.getTargetFlags()) {
37 default: llvm_unreachable(0 && "Unknown target flag on GV operand");
41 return Ctx.GetOrCreateSymbol(Name.str());
44 MCSymbol *MSP430MCInstLower::
45 GetExternalSymbolSymbol(const MachineOperand &MO) const {
46 SmallString<128> Name;
47 Name += Printer.MAI->getGlobalPrefix();
48 Name += MO.getSymbolName();
50 switch (MO.getTargetFlags()) {
51 default: assert(0 && "Unknown target flag on GV operand");
55 return Ctx.GetOrCreateSymbol(Name.str());
58 MCSymbol *MSP430MCInstLower::
59 GetJumpTableSymbol(const MachineOperand &MO) const {
60 SmallString<256> Name;
61 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
62 << Printer.getFunctionNumber() << '_'
65 switch (MO.getTargetFlags()) {
66 default: llvm_unreachable("Unknown target flag on GV operand");
70 // Create a symbol for the name.
71 return Ctx.GetOrCreateSymbol(Name.str());
74 MCSymbol *MSP430MCInstLower::
75 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
76 SmallString<256> Name;
77 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
78 << Printer.getFunctionNumber() << '_'
81 switch (MO.getTargetFlags()) {
82 default: llvm_unreachable("Unknown target flag on GV operand");
86 // Create a symbol for the name.
87 return Ctx.GetOrCreateSymbol(Name.str());
90 MCOperand MSP430MCInstLower::
91 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
92 // FIXME: We would like an efficient form for this, so we don't have to do a
93 // lot of extra uniquing.
94 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);
108 void MSP430MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
109 OutMI.setOpcode(MI->getOpcode());
111 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
112 const MachineOperand &MO = MI->getOperand(i);
115 switch (MO.getType()) {
118 assert(0 && "unknown operand type");
119 case MachineOperand::MO_Register:
120 // Ignore all implicit register operands.
121 if (MO.isImplicit()) continue;
122 MCOp = MCOperand::CreateReg(MO.getReg());
124 case MachineOperand::MO_Immediate:
125 MCOp = MCOperand::CreateImm(MO.getImm());
127 case MachineOperand::MO_MachineBasicBlock:
128 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
129 Printer.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
131 case MachineOperand::MO_GlobalAddress:
132 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
134 case MachineOperand::MO_ExternalSymbol:
135 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
137 case MachineOperand::MO_JumpTableIndex:
138 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
140 case MachineOperand::MO_ConstantPoolIndex:
141 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
145 OutMI.addOperand(MCOp);