1 //===-- SparcMCInstLower.cpp - Convert Sparc MachineInstr to 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 Sparc MachineInstrs to their corresponding
11 // MCInst records.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "Sparc.h"
16 #include "MCTargetDesc/SparcMCExpr.h"
17 #include "llvm/ADT/SmallString.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstr.h"
21 #include "llvm/CodeGen/MachineOperand.h"
22 #include "llvm/IR/Mangler.h"
23 #include "llvm/MC/MCAsmInfo.h"
24 #include "llvm/MC/MCContext.h"
25 #include "llvm/MC/MCExpr.h"
26 #include "llvm/MC/MCInst.h"
27
28 using namespace llvm;
29
30
LowerSymbolOperand(const MachineInstr * MI,const MachineOperand & MO,AsmPrinter & AP)31 static MCOperand LowerSymbolOperand(const MachineInstr *MI,
32 const MachineOperand &MO,
33 AsmPrinter &AP) {
34
35 SparcMCExpr::VariantKind Kind =
36 (SparcMCExpr::VariantKind)MO.getTargetFlags();
37 const MCSymbol *Symbol = nullptr;
38
39 switch(MO.getType()) {
40 default: llvm_unreachable("Unknown type in LowerSymbolOperand");
41 case MachineOperand::MO_MachineBasicBlock:
42 Symbol = MO.getMBB()->getSymbol();
43 break;
44
45 case MachineOperand::MO_GlobalAddress:
46 Symbol = AP.getSymbol(MO.getGlobal());
47 break;
48
49 case MachineOperand::MO_BlockAddress:
50 Symbol = AP.GetBlockAddressSymbol(MO.getBlockAddress());
51 break;
52
53 case MachineOperand::MO_ExternalSymbol:
54 Symbol = AP.GetExternalSymbolSymbol(MO.getSymbolName());
55 break;
56
57 case MachineOperand::MO_ConstantPoolIndex:
58 Symbol = AP.GetCPISymbol(MO.getIndex());
59 break;
60 }
61
62 const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::Create(Symbol,
63 AP.OutContext);
64 const SparcMCExpr *expr = SparcMCExpr::Create(Kind, MCSym,
65 AP.OutContext);
66 return MCOperand::CreateExpr(expr);
67 }
68
LowerOperand(const MachineInstr * MI,const MachineOperand & MO,AsmPrinter & AP)69 static MCOperand LowerOperand(const MachineInstr *MI,
70 const MachineOperand &MO,
71 AsmPrinter &AP) {
72 switch(MO.getType()) {
73 default: llvm_unreachable("unknown operand type"); break;
74 case MachineOperand::MO_Register:
75 if (MO.isImplicit())
76 break;
77 return MCOperand::CreateReg(MO.getReg());
78
79 case MachineOperand::MO_Immediate:
80 return MCOperand::CreateImm(MO.getImm());
81
82 case MachineOperand::MO_MachineBasicBlock:
83 case MachineOperand::MO_GlobalAddress:
84 case MachineOperand::MO_BlockAddress:
85 case MachineOperand::MO_ExternalSymbol:
86 case MachineOperand::MO_ConstantPoolIndex:
87 return LowerSymbolOperand(MI, MO, AP);
88
89 case MachineOperand::MO_RegisterMask: break;
90
91 }
92 return MCOperand();
93 }
94
LowerSparcMachineInstrToMCInst(const MachineInstr * MI,MCInst & OutMI,AsmPrinter & AP)95 void llvm::LowerSparcMachineInstrToMCInst(const MachineInstr *MI,
96 MCInst &OutMI,
97 AsmPrinter &AP)
98 {
99
100 OutMI.setOpcode(MI->getOpcode());
101
102 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
103 const MachineOperand &MO = MI->getOperand(i);
104 MCOperand MCOp = LowerOperand(MI, MO, AP);
105
106 if (MCOp.isValid())
107 OutMI.addOperand(MCOp);
108 }
109 }
110