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/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"
27 using namespace llvm;
28
29 MCSymbol *MSP430MCInstLower::
GetGlobalAddressSymbol(const MachineOperand & MO) const30 GetGlobalAddressSymbol(const MachineOperand &MO) const {
31 switch (MO.getTargetFlags()) {
32 default: llvm_unreachable("Unknown target flag on GV operand");
33 case 0: break;
34 }
35
36 return Printer.Mang->getSymbol(MO.getGlobal());
37 }
38
39 MCSymbol *MSP430MCInstLower::
GetExternalSymbolSymbol(const MachineOperand & MO) const40 GetExternalSymbolSymbol(const MachineOperand &MO) const {
41 switch (MO.getTargetFlags()) {
42 default: assert(0 && "Unknown target flag on GV operand");
43 case 0: break;
44 }
45
46 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
47 }
48
49 MCSymbol *MSP430MCInstLower::
GetJumpTableSymbol(const MachineOperand & MO) const50 GetJumpTableSymbol(const MachineOperand &MO) const {
51 SmallString<256> Name;
52 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
53 << Printer.getFunctionNumber() << '_'
54 << MO.getIndex();
55
56 switch (MO.getTargetFlags()) {
57 default: llvm_unreachable("Unknown target flag on GV operand");
58 case 0: break;
59 }
60
61 // Create a symbol for the name.
62 return Ctx.GetOrCreateSymbol(Name.str());
63 }
64
65 MCSymbol *MSP430MCInstLower::
GetConstantPoolIndexSymbol(const MachineOperand & MO) const66 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
67 SmallString<256> Name;
68 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
69 << Printer.getFunctionNumber() << '_'
70 << MO.getIndex();
71
72 switch (MO.getTargetFlags()) {
73 default: llvm_unreachable("Unknown target flag on GV operand");
74 case 0: break;
75 }
76
77 // Create a symbol for the name.
78 return Ctx.GetOrCreateSymbol(Name.str());
79 }
80
81 MCSymbol *MSP430MCInstLower::
GetBlockAddressSymbol(const MachineOperand & MO) const82 GetBlockAddressSymbol(const MachineOperand &MO) const {
83 switch (MO.getTargetFlags()) {
84 default: assert(0 && "Unknown target flag on GV operand");
85 case 0: break;
86 }
87
88 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
89 }
90
91 MCOperand MSP430MCInstLower::
LowerSymbolOperand(const MachineOperand & MO,MCSymbol * Sym) const92 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);
96
97 switch (MO.getTargetFlags()) {
98 default: llvm_unreachable("Unknown target flag on GV operand");
99 case 0: break;
100 }
101
102 if (!MO.isJTI() && MO.getOffset())
103 Expr = MCBinaryExpr::CreateAdd(Expr,
104 MCConstantExpr::Create(MO.getOffset(), Ctx),
105 Ctx);
106 return MCOperand::CreateExpr(Expr);
107 }
108
Lower(const MachineInstr * MI,MCInst & OutMI) const109 void MSP430MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
110 OutMI.setOpcode(MI->getOpcode());
111
112 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
113 const MachineOperand &MO = MI->getOperand(i);
114
115 MCOperand MCOp;
116 switch (MO.getType()) {
117 default:
118 MI->dump();
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());
124 break;
125 case MachineOperand::MO_Immediate:
126 MCOp = MCOperand::CreateImm(MO.getImm());
127 break;
128 case MachineOperand::MO_MachineBasicBlock:
129 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
130 MO.getMBB()->getSymbol(), Ctx));
131 break;
132 case MachineOperand::MO_GlobalAddress:
133 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
134 break;
135 case MachineOperand::MO_ExternalSymbol:
136 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
137 break;
138 case MachineOperand::MO_JumpTableIndex:
139 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
140 break;
141 case MachineOperand::MO_ConstantPoolIndex:
142 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
143 break;
144 case MachineOperand::MO_BlockAddress:
145 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
146 }
147
148 OutMI.addOperand(MCOp);
149 }
150 }
151