1 //===-- MSP430MCInstLower.cpp - Convert MSP430 MachineInstr to an MCInst --===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains code to lower MSP430 MachineInstrs to their corresponding
11 // MCInst records.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "MSP430MCInstLower.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/CodeGen/AsmPrinter.h"
18 #include "llvm/CodeGen/MachineBasicBlock.h"
19 #include "llvm/CodeGen/MachineInstr.h"
20 #include "llvm/IR/DataLayout.h"
21 #include "llvm/IR/Mangler.h"
22 #include "llvm/MC/MCAsmInfo.h"
23 #include "llvm/MC/MCContext.h"
24 #include "llvm/MC/MCExpr.h"
25 #include "llvm/MC/MCInst.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/Target/TargetMachine.h"
29 #include "llvm/Target/TargetSubtargetInfo.h"
30 using namespace llvm;
31
32 MCSymbol *MSP430MCInstLower::
GetGlobalAddressSymbol(const MachineOperand & MO) const33 GetGlobalAddressSymbol(const MachineOperand &MO) const {
34 switch (MO.getTargetFlags()) {
35 default: llvm_unreachable("Unknown target flag on GV operand");
36 case 0: break;
37 }
38
39 return Printer.getSymbol(MO.getGlobal());
40 }
41
42 MCSymbol *MSP430MCInstLower::
GetExternalSymbolSymbol(const MachineOperand & MO) const43 GetExternalSymbolSymbol(const MachineOperand &MO) const {
44 switch (MO.getTargetFlags()) {
45 default: llvm_unreachable("Unknown target flag on GV operand");
46 case 0: break;
47 }
48
49 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
50 }
51
52 MCSymbol *MSP430MCInstLower::
GetJumpTableSymbol(const MachineOperand & MO) const53 GetJumpTableSymbol(const MachineOperand &MO) const {
54 const DataLayout *DL = Printer.TM.getSubtargetImpl()->getDataLayout();
55 SmallString<256> Name;
56 raw_svector_ostream(Name) << DL->getPrivateGlobalPrefix() << "JTI"
57 << Printer.getFunctionNumber() << '_'
58 << MO.getIndex();
59
60 switch (MO.getTargetFlags()) {
61 default: llvm_unreachable("Unknown target flag on GV operand");
62 case 0: break;
63 }
64
65 // Create a symbol for the name.
66 return Ctx.GetOrCreateSymbol(Name.str());
67 }
68
69 MCSymbol *MSP430MCInstLower::
GetConstantPoolIndexSymbol(const MachineOperand & MO) const70 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
71 const DataLayout *DL = Printer.TM.getSubtargetImpl()->getDataLayout();
72 SmallString<256> Name;
73 raw_svector_ostream(Name) << DL->getPrivateGlobalPrefix() << "CPI"
74 << Printer.getFunctionNumber() << '_'
75 << MO.getIndex();
76
77 switch (MO.getTargetFlags()) {
78 default: llvm_unreachable("Unknown target flag on GV operand");
79 case 0: break;
80 }
81
82 // Create a symbol for the name.
83 return Ctx.GetOrCreateSymbol(Name.str());
84 }
85
86 MCSymbol *MSP430MCInstLower::
GetBlockAddressSymbol(const MachineOperand & MO) const87 GetBlockAddressSymbol(const MachineOperand &MO) const {
88 switch (MO.getTargetFlags()) {
89 default: llvm_unreachable("Unknown target flag on GV operand");
90 case 0: break;
91 }
92
93 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
94 }
95
96 MCOperand MSP430MCInstLower::
LowerSymbolOperand(const MachineOperand & MO,MCSymbol * Sym) const97 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
98 // FIXME: We would like an efficient form for this, so we don't have to do a
99 // lot of extra uniquing.
100 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
101
102 switch (MO.getTargetFlags()) {
103 default: llvm_unreachable("Unknown target flag on GV operand");
104 case 0: break;
105 }
106
107 if (!MO.isJTI() && MO.getOffset())
108 Expr = MCBinaryExpr::CreateAdd(Expr,
109 MCConstantExpr::Create(MO.getOffset(), Ctx),
110 Ctx);
111 return MCOperand::CreateExpr(Expr);
112 }
113
Lower(const MachineInstr * MI,MCInst & OutMI) const114 void MSP430MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
115 OutMI.setOpcode(MI->getOpcode());
116
117 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
118 const MachineOperand &MO = MI->getOperand(i);
119
120 MCOperand MCOp;
121 switch (MO.getType()) {
122 default:
123 MI->dump();
124 llvm_unreachable("unknown operand type");
125 case MachineOperand::MO_Register:
126 // Ignore all implicit register operands.
127 if (MO.isImplicit()) continue;
128 MCOp = MCOperand::CreateReg(MO.getReg());
129 break;
130 case MachineOperand::MO_Immediate:
131 MCOp = MCOperand::CreateImm(MO.getImm());
132 break;
133 case MachineOperand::MO_MachineBasicBlock:
134 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
135 MO.getMBB()->getSymbol(), Ctx));
136 break;
137 case MachineOperand::MO_GlobalAddress:
138 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
139 break;
140 case MachineOperand::MO_ExternalSymbol:
141 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
142 break;
143 case MachineOperand::MO_JumpTableIndex:
144 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
145 break;
146 case MachineOperand::MO_ConstantPoolIndex:
147 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
148 break;
149 case MachineOperand::MO_BlockAddress:
150 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
151 break;
152 case MachineOperand::MO_RegisterMask:
153 continue;
154 }
155
156 OutMI.addOperand(MCOp);
157 }
158 }
159