1 //===-- AVRMCInstLower.cpp - Convert AVR MachineInstr to an MCInst --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains code to lower AVR MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "AVRMCInstLower.h"
17 #include "AVRInstrInfo.h"
18 #include "MCTargetDesc/AVRMCExpr.h"
20 #include "llvm/CodeGen/AsmPrinter.h"
21 #include "llvm/IR/Mangler.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/Support/ErrorHandling.h"
27 MCOperand AVRMCInstLower::lowerSymbolOperand(const MachineOperand &MO,
28 MCSymbol *Sym) const {
29 unsigned char TF = MO.getTargetFlags();
30 const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
32 bool IsNegated = false;
33 if (TF & AVRII::MO_NEG) { IsNegated = true; }
35 if (!MO.isJTI() && MO.getOffset()) {
36 Expr = MCBinaryExpr::createAdd(
37 Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
40 bool IsFunction = MO.isGlobal() && isa<Function>(MO.getGlobal());
42 if (TF & AVRII::MO_LO) {
44 // N.B. Should we use _GS fixups here to cope with >128k progmem?
45 Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_LO8, Expr, IsNegated, Ctx);
47 Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_LO8, Expr, IsNegated, Ctx);
49 } else if (TF & AVRII::MO_HI) {
51 // N.B. Should we use _GS fixups here to cope with >128k progmem?
52 Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_HI8, Expr, IsNegated, Ctx);
54 Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_HI8, Expr, IsNegated, Ctx);
57 llvm_unreachable("Unknown target flag on symbol operand");
60 return MCOperand::createExpr(Expr);
63 void AVRMCInstLower::lowerInstruction(const MachineInstr &MI, MCInst &OutMI) const {
64 OutMI.setOpcode(MI.getOpcode());
66 for (MachineOperand const &MO : MI.operands()) {
69 switch (MO.getType()) {
72 llvm_unreachable("unknown operand type");
73 case MachineOperand::MO_Register:
74 // Ignore all implicit register operands.
77 MCOp = MCOperand::createReg(MO.getReg());
79 case MachineOperand::MO_Immediate:
80 MCOp = MCOperand::createImm(MO.getImm());
82 case MachineOperand::MO_GlobalAddress:
83 MCOp = lowerSymbolOperand(MO, Printer.getSymbol(MO.getGlobal()));
85 case MachineOperand::MO_ExternalSymbol:
86 MCOp = lowerSymbolOperand(
87 MO, Printer.GetExternalSymbolSymbol(MO.getSymbolName()));
89 case MachineOperand::MO_MachineBasicBlock:
90 MCOp = MCOperand::createExpr(
91 MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
93 case MachineOperand::MO_RegisterMask:
95 case MachineOperand::MO_BlockAddress:
96 MCOp = lowerSymbolOperand(
97 MO, Printer.GetBlockAddressSymbol(MO.getBlockAddress()));
99 case MachineOperand::MO_JumpTableIndex:
100 MCOp = lowerSymbolOperand(MO, Printer.GetJTISymbol(MO.getIndex()));
102 case MachineOperand::MO_ConstantPoolIndex:
103 MCOp = lowerSymbolOperand(MO, Printer.GetCPISymbol(MO.getIndex()));
107 OutMI.addOperand(MCOp);
111 } // end of namespace llvm