114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
//===-- AVRMCInstLower.cpp - Convert AVR MachineInstr to an MCInst --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains code to lower AVR MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "AVRMCInstLower.h"
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#include "AVRInstrInfo.h"
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#include "MCTargetDesc/AVRMCExpr.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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MCOperand AVRMCInstLower::lowerSymbolOperand(const MachineOperand &MO,
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MCSymbol *Sym) const {
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unsigned char TF = MO.getTargetFlags();
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const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
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bool IsNegated = false;
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if (TF & AVRII::MO_NEG) {
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IsNegated = true;
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}
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if (!MO.isJTI() && MO.getOffset()) {
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Expr = MCBinaryExpr::createAdd(
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Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
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}
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bool IsFunction = MO.isGlobal() && isa<Function>(MO.getGlobal());
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if (TF & AVRII::MO_LO) {
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if (IsFunction) {
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// N.B. Should we use _GS fixups here to cope with >128k progmem?
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Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_LO8, Expr, IsNegated, Ctx);
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} else {
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Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_LO8, Expr, IsNegated, Ctx);
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}
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} else if (TF & AVRII::MO_HI) {
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if (IsFunction) {
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// N.B. Should we use _GS fixups here to cope with >128k progmem?
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Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_HI8, Expr, IsNegated, Ctx);
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} else {
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Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_HI8, Expr, IsNegated, Ctx);
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}
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} else if (TF != 0) {
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llvm_unreachable("Unknown target flag on symbol operand");
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}
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return MCOperand::createExpr(Expr);
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}
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void AVRMCInstLower::lowerInstruction(const MachineInstr &MI,
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MCInst &OutMI) const {
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OutMI.setOpcode(MI.getOpcode());
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for (MachineOperand const &MO : MI.operands()) {
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MCOperand MCOp;
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switch (MO.getType()) {
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default:
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MI.print(errs());
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llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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// Ignore all implicit register operands.
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if (MO.isImplicit())
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continue;
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MCOp = MCOperand::createReg(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::createImm(MO.getImm());
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break;
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case MachineOperand::MO_GlobalAddress:
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MCOp = lowerSymbolOperand(MO, Printer.getSymbol(MO.getGlobal()));
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break;
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case MachineOperand::MO_ExternalSymbol:
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MCOp = lowerSymbolOperand(
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MO, Printer.GetExternalSymbolSymbol(MO.getSymbolName()));
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break;
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case MachineOperand::MO_MachineBasicBlock:
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MCOp = MCOperand::createExpr(
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MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
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break;
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case MachineOperand::MO_RegisterMask:
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continue;
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case MachineOperand::MO_BlockAddress:
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MCOp = lowerSymbolOperand(
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MO, Printer.GetBlockAddressSymbol(MO.getBlockAddress()));
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break;
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case MachineOperand::MO_JumpTableIndex:
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MCOp = lowerSymbolOperand(MO, Printer.GetJTISymbol(MO.getIndex()));
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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MCOp = lowerSymbolOperand(MO, Printer.GetCPISymbol(MO.getIndex()));
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break;
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}
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OutMI.addOperand(MCOp);
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}
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}
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} // end of namespace llvm
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