1//=-- LanaiMCInstLower.cpp - Convert Lanai 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 Lanai MachineInstrs to their corresponding
10// MCInst records.
11//
12//===----------------------------------------------------------------------===//
13
14#include "LanaiMCInstLower.h"
15
16#include "MCTargetDesc/LanaiBaseInfo.h"
17#include "MCTargetDesc/LanaiMCAsmInfo.h"
18#include "llvm/ADT/SmallString.h"
19#include "llvm/CodeGen/AsmPrinter.h"
20#include "llvm/CodeGen/MachineBasicBlock.h"
21#include "llvm/CodeGen/MachineInstr.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
29using namespace llvm;
30
31MCSymbol *
32LanaiMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
33 return Printer.getSymbol(GV: MO.getGlobal());
34}
35
36MCSymbol *
37LanaiMCInstLower::GetBlockAddressSymbol(const MachineOperand &MO) const {
38 return Printer.GetBlockAddressSymbol(BA: MO.getBlockAddress());
39}
40
41MCSymbol *
42LanaiMCInstLower::GetExternalSymbolSymbol(const MachineOperand &MO) const {
43 return Printer.GetExternalSymbolSymbol(Sym: MO.getSymbolName());
44}
45
46MCSymbol *LanaiMCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
47 SmallString<256> Name;
48 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
49 << Printer.getFunctionNumber() << '_'
50 << MO.getIndex();
51 // Create a symbol for the name.
52 return Ctx.getOrCreateSymbol(Name: Name.str());
53}
54
55MCSymbol *
56LanaiMCInstLower::GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
57 SmallString<256> Name;
58 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
59 << Printer.getFunctionNumber() << '_'
60 << MO.getIndex();
61 // Create a symbol for the name.
62 return Ctx.getOrCreateSymbol(Name: Name.str());
63}
64
65MCOperand LanaiMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
66 MCSymbol *Sym) const {
67 Lanai::Specifier Kind;
68 switch (MO.getTargetFlags()) {
69 case LanaiII::MO_NO_FLAG:
70 Kind = Lanai::S_None;
71 break;
72 case LanaiII::MO_ABS_HI:
73 Kind = Lanai::S_ABS_HI;
74 break;
75 case LanaiII::MO_ABS_LO:
76 Kind = Lanai::S_ABS_LO;
77 break;
78 default:
79 llvm_unreachable("Unknown target flag on GV operand");
80 }
81
82 const MCExpr *Expr = MCSymbolRefExpr::create(Symbol: Sym, Ctx);
83 if (!MO.isJTI() && MO.getOffset())
84 Expr = MCBinaryExpr::createAdd(
85 LHS: Expr, RHS: MCConstantExpr::create(Value: MO.getOffset(), Ctx), Ctx);
86 Expr = MCSpecifierExpr::create(Expr, S: Kind, Ctx);
87 return MCOperand::createExpr(Val: Expr);
88}
89
90void LanaiMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
91 OutMI.setOpcode(MI->getOpcode());
92
93 for (const MachineOperand &MO : MI->operands()) {
94 MCOperand MCOp;
95 switch (MO.getType()) {
96 case MachineOperand::MO_Register:
97 // Ignore all implicit register operands.
98 if (MO.isImplicit())
99 continue;
100 MCOp = MCOperand::createReg(Reg: MO.getReg());
101 break;
102 case MachineOperand::MO_Immediate:
103 MCOp = MCOperand::createImm(Val: MO.getImm());
104 break;
105 case MachineOperand::MO_MachineBasicBlock:
106 MCOp = MCOperand::createExpr(
107 Val: MCSymbolRefExpr::create(Symbol: MO.getMBB()->getSymbol(), Ctx));
108 break;
109 case MachineOperand::MO_RegisterMask:
110 continue;
111 case MachineOperand::MO_GlobalAddress:
112 MCOp = LowerSymbolOperand(MO, Sym: GetGlobalAddressSymbol(MO));
113 break;
114 case MachineOperand::MO_BlockAddress:
115 MCOp = LowerSymbolOperand(MO, Sym: GetBlockAddressSymbol(MO));
116 break;
117 case MachineOperand::MO_ExternalSymbol:
118 MCOp = LowerSymbolOperand(MO, Sym: GetExternalSymbolSymbol(MO));
119 break;
120 case MachineOperand::MO_JumpTableIndex:
121 MCOp = LowerSymbolOperand(MO, Sym: GetJumpTableSymbol(MO));
122 break;
123 case MachineOperand::MO_ConstantPoolIndex:
124 MCOp = LowerSymbolOperand(MO, Sym: GetConstantPoolIndexSymbol(MO));
125 break;
126 default:
127 MI->print(OS&: errs());
128 llvm_unreachable("unknown operand type");
129 }
130
131 OutMI.addOperand(Op: MCOp);
132 }
133}
134