1 //===-- MSP430MCInstLower.cpp - Convert MSP430 MachineInstr to an MCInst --===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains code to lower MSP430 MachineInstrs to their corresponding
10 // MCInst records.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "MSP430MCInstLower.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/CodeGen/AsmPrinter.h"
17 #include "llvm/CodeGen/MachineBasicBlock.h"
18 #include "llvm/CodeGen/MachineInstr.h"
19 #include "llvm/IR/DataLayout.h"
20 #include "llvm/IR/Mangler.h"
21 #include "llvm/MC/MCAsmInfo.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include "llvm/Target/TargetMachine.h"
28 using namespace llvm;
29
30 MCSymbol *MSP430MCInstLower::
GetGlobalAddressSymbol(const MachineOperand & MO) const31 GetGlobalAddressSymbol(const MachineOperand &MO) const {
32 switch (MO.getTargetFlags()) {
33 default: llvm_unreachable("Unknown target flag on GV operand");
34 case 0: break;
35 }
36
37 return Printer.getSymbol(MO.getGlobal());
38 }
39
40 MCSymbol *MSP430MCInstLower::
GetExternalSymbolSymbol(const MachineOperand & MO) const41 GetExternalSymbolSymbol(const MachineOperand &MO) const {
42 switch (MO.getTargetFlags()) {
43 default: llvm_unreachable("Unknown target flag on GV operand");
44 case 0: break;
45 }
46
47 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
48 }
49
50 MCSymbol *MSP430MCInstLower::
GetJumpTableSymbol(const MachineOperand & MO) const51 GetJumpTableSymbol(const MachineOperand &MO) const {
52 const DataLayout &DL = Printer.getDataLayout();
53 SmallString<256> Name;
54 raw_svector_ostream(Name) << DL.getPrivateGlobalPrefix() << "JTI"
55 << Printer.getFunctionNumber() << '_'
56 << MO.getIndex();
57
58 switch (MO.getTargetFlags()) {
59 default: llvm_unreachable("Unknown target flag on GV operand");
60 case 0: break;
61 }
62
63 // Create a symbol for the name.
64 return Ctx.getOrCreateSymbol(Name);
65 }
66
67 MCSymbol *MSP430MCInstLower::
GetConstantPoolIndexSymbol(const MachineOperand & MO) const68 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
69 const DataLayout &DL = Printer.getDataLayout();
70 SmallString<256> Name;
71 raw_svector_ostream(Name) << DL.getPrivateGlobalPrefix() << "CPI"
72 << Printer.getFunctionNumber() << '_'
73 << MO.getIndex();
74
75 switch (MO.getTargetFlags()) {
76 default: llvm_unreachable("Unknown target flag on GV operand");
77 case 0: break;
78 }
79
80 // Create a symbol for the name.
81 return Ctx.getOrCreateSymbol(Name);
82 }
83
84 MCSymbol *MSP430MCInstLower::
GetBlockAddressSymbol(const MachineOperand & MO) const85 GetBlockAddressSymbol(const MachineOperand &MO) const {
86 switch (MO.getTargetFlags()) {
87 default: llvm_unreachable("Unknown target flag on GV operand");
88 case 0: break;
89 }
90
91 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
92 }
93
94 MCOperand MSP430MCInstLower::
LowerSymbolOperand(const MachineOperand & MO,MCSymbol * Sym) const95 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
96 // FIXME: We would like an efficient form for this, so we don't have to do a
97 // lot of extra uniquing.
98 const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
99
100 switch (MO.getTargetFlags()) {
101 default: llvm_unreachable("Unknown target flag on GV operand");
102 case 0: break;
103 }
104
105 if (!MO.isJTI() && MO.getOffset())
106 Expr = MCBinaryExpr::createAdd(Expr,
107 MCConstantExpr::create(MO.getOffset(), Ctx),
108 Ctx);
109 return MCOperand::createExpr(Expr);
110 }
111
112 #define GET_REGINFO_ENUM
113 #include "MSP430GenRegisterInfo.inc"
114
Lower(const MachineInstr * MI,MCInst & OutMI) const115 void MSP430MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
116 OutMI.setOpcode(MI->getOpcode());
117
118 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
119 const MachineOperand &MO = MI->getOperand(i);
120
121 MCOperand MCOp;
122 switch (MO.getType()) {
123 default:
124 MI->print(errs());
125 llvm_unreachable("unknown operand type");
126 case MachineOperand::MO_Register:
127 // Ignore all implicit register operands.
128 if (MO.isImplicit()) continue;
129 MCOp = MCOperand::createReg(MO.getReg());
130 break;
131 case MachineOperand::MO_Immediate:
132 MCOp = MCOperand::createImm(MO.getImm());
133 break;
134 case MachineOperand::MO_MachineBasicBlock:
135 MCOp = MCOperand::createExpr(MCSymbolRefExpr::create(
136 MO.getMBB()->getSymbol(), Ctx));
137 break;
138 case MachineOperand::MO_GlobalAddress:
139 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
140 break;
141 case MachineOperand::MO_ExternalSymbol:
142 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
143 break;
144 case MachineOperand::MO_JumpTableIndex:
145 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
146 break;
147 case MachineOperand::MO_ConstantPoolIndex:
148 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
149 break;
150 case MachineOperand::MO_BlockAddress:
151 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
152 break;
153 case MachineOperand::MO_RegisterMask:
154 continue;
155 }
156
157 OutMI.addOperand(MCOp);
158 }
159 }
160