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