1//===-- AVRMCInstLower.cpp - Convert AVR 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 AVR MachineInstrs to their corresponding
10// MCInst records.
11//
12//===----------------------------------------------------------------------===//
13
14#include "AVRMCInstLower.h"
15#include "AVRInstrInfo.h"
16#include "MCTargetDesc/AVRMCExpr.h"
17
18#include "llvm/CodeGen/AsmPrinter.h"
19#include "llvm/IR/Mangler.h"
20#include "llvm/MC/MCInst.h"
21#include "llvm/Support/ErrorHandling.h"
22
23namespace llvm {
24
25MCOperand
26AVRMCInstLower::lowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym,
27 const AVRSubtarget &Subtarget) const {
28 unsigned char TF = MO.getTargetFlags();
29 const MCExpr *Expr = MCSymbolRefExpr::create(Symbol: Sym, Ctx);
30
31 bool IsNegated = false;
32 if (TF & AVRII::MO_NEG) {
33 IsNegated = true;
34 }
35
36 if (!MO.isJTI() && MO.getOffset()) {
37 Expr = MCBinaryExpr::createAdd(
38 LHS: Expr, RHS: MCConstantExpr::create(Value: MO.getOffset(), Ctx), Ctx);
39 }
40
41 bool IsFunction = MO.isGlobal() && isa<Function>(Val: MO.getGlobal());
42
43 if (TF & AVRII::MO_LO) {
44 if (IsFunction) {
45 Expr =
46 AVRMCExpr::create(Kind: Subtarget.hasEIJMPCALL() ? AVRMCExpr::VK_AVR_LO8_GS
47 : AVRMCExpr::VK_AVR_PM_LO8,
48 Expr, isNegated: IsNegated, Ctx);
49 } else {
50 Expr = AVRMCExpr::create(Kind: AVRMCExpr::VK_AVR_LO8, Expr, isNegated: IsNegated, Ctx);
51 }
52 } else if (TF & AVRII::MO_HI) {
53 if (IsFunction) {
54 Expr =
55 AVRMCExpr::create(Kind: Subtarget.hasEIJMPCALL() ? AVRMCExpr::VK_AVR_HI8_GS
56 : AVRMCExpr::VK_AVR_PM_HI8,
57 Expr, isNegated: IsNegated, Ctx);
58 } else {
59 Expr = AVRMCExpr::create(Kind: AVRMCExpr::VK_AVR_HI8, Expr, isNegated: IsNegated, Ctx);
60 }
61 } else if (TF != 0) {
62 llvm_unreachable("Unknown target flag on symbol operand");
63 }
64
65 return MCOperand::createExpr(Val: Expr);
66}
67
68void AVRMCInstLower::lowerInstruction(const MachineInstr &MI,
69 MCInst &OutMI) const {
70 auto &Subtarget = MI.getParent()->getParent()->getSubtarget<AVRSubtarget>();
71 OutMI.setOpcode(MI.getOpcode());
72
73 for (MachineOperand const &MO : MI.operands()) {
74 MCOperand MCOp;
75
76 switch (MO.getType()) {
77 default:
78 MI.print(OS&: errs());
79 llvm_unreachable("unknown operand type");
80 case MachineOperand::MO_Register:
81 // Ignore all implicit register operands.
82 if (MO.isImplicit())
83 continue;
84 MCOp = MCOperand::createReg(Reg: MO.getReg());
85 break;
86 case MachineOperand::MO_Immediate:
87 MCOp = MCOperand::createImm(Val: MO.getImm());
88 break;
89 case MachineOperand::MO_GlobalAddress:
90 MCOp =
91 lowerSymbolOperand(MO, Sym: Printer.getSymbol(GV: MO.getGlobal()), Subtarget);
92 break;
93 case MachineOperand::MO_ExternalSymbol:
94 MCOp = lowerSymbolOperand(
95 MO, Sym: Printer.GetExternalSymbolSymbol(Sym: MO.getSymbolName()), Subtarget);
96 break;
97 case MachineOperand::MO_MachineBasicBlock:
98 MCOp = MCOperand::createExpr(
99 Val: MCSymbolRefExpr::create(Symbol: MO.getMBB()->getSymbol(), Ctx));
100 break;
101 case MachineOperand::MO_RegisterMask:
102 continue;
103 case MachineOperand::MO_BlockAddress:
104 MCOp = lowerSymbolOperand(
105 MO, Sym: Printer.GetBlockAddressSymbol(BA: MO.getBlockAddress()), Subtarget);
106 break;
107 case MachineOperand::MO_JumpTableIndex:
108 MCOp = lowerSymbolOperand(MO, Sym: Printer.GetJTISymbol(JTID: MO.getIndex()),
109 Subtarget);
110 break;
111 case MachineOperand::MO_ConstantPoolIndex:
112 MCOp = lowerSymbolOperand(MO, Sym: Printer.GetCPISymbol(CPID: MO.getIndex()),
113 Subtarget);
114 break;
115 }
116
117 OutMI.addOperand(Op: MCOp);
118 }
119}
120
121} // end of namespace llvm
122