forked from OSchip/llvm-project
115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
//===-- XCoreMCInstLower.cpp - Convert XCore MachineInstr to MCInst -------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// \brief This file contains code to lower XCore MachineInstrs to their
|
|
/// corresponding MCInst records.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
#include "XCoreMCInstLower.h"
|
|
#include "llvm/CodeGen/AsmPrinter.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/CodeGen/MachineOperand.h"
|
|
#include "llvm/IR/Mangler.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
|
|
using namespace llvm;
|
|
|
|
XCoreMCInstLower::XCoreMCInstLower(class AsmPrinter &asmprinter)
|
|
: Printer(asmprinter) {}
|
|
|
|
void XCoreMCInstLower::Initialize(MCContext *C) { Ctx = C; }
|
|
|
|
MCOperand XCoreMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
|
|
MachineOperandType MOTy,
|
|
unsigned Offset) const {
|
|
MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
|
|
const MCSymbol *Symbol;
|
|
|
|
switch (MOTy) {
|
|
case MachineOperand::MO_MachineBasicBlock:
|
|
Symbol = MO.getMBB()->getSymbol();
|
|
break;
|
|
case MachineOperand::MO_GlobalAddress:
|
|
Symbol = Printer.getSymbol(MO.getGlobal());
|
|
Offset += MO.getOffset();
|
|
break;
|
|
case MachineOperand::MO_BlockAddress:
|
|
Symbol = Printer.GetBlockAddressSymbol(MO.getBlockAddress());
|
|
Offset += MO.getOffset();
|
|
break;
|
|
case MachineOperand::MO_ExternalSymbol:
|
|
Symbol = Printer.GetExternalSymbolSymbol(MO.getSymbolName());
|
|
Offset += MO.getOffset();
|
|
break;
|
|
case MachineOperand::MO_JumpTableIndex:
|
|
Symbol = Printer.GetJTISymbol(MO.getIndex());
|
|
break;
|
|
case MachineOperand::MO_ConstantPoolIndex:
|
|
Symbol = Printer.GetCPISymbol(MO.getIndex());
|
|
Offset += MO.getOffset();
|
|
break;
|
|
default:
|
|
llvm_unreachable("<unknown operand type>");
|
|
}
|
|
|
|
const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Symbol, Kind, *Ctx);
|
|
|
|
if (!Offset)
|
|
return MCOperand::createExpr(MCSym);
|
|
|
|
// Assume offset is never negative.
|
|
assert(Offset > 0);
|
|
|
|
const MCConstantExpr *OffsetExpr = MCConstantExpr::create(Offset, *Ctx);
|
|
const MCBinaryExpr *Add = MCBinaryExpr::createAdd(MCSym, OffsetExpr, *Ctx);
|
|
return MCOperand::createExpr(Add);
|
|
}
|
|
|
|
MCOperand XCoreMCInstLower::LowerOperand(const MachineOperand &MO,
|
|
unsigned offset) const {
|
|
MachineOperandType MOTy = MO.getType();
|
|
|
|
switch (MOTy) {
|
|
default: llvm_unreachable("unknown operand type");
|
|
case MachineOperand::MO_Register:
|
|
// Ignore all implicit register operands.
|
|
if (MO.isImplicit()) break;
|
|
return MCOperand::createReg(MO.getReg());
|
|
case MachineOperand::MO_Immediate:
|
|
return MCOperand::createImm(MO.getImm() + offset);
|
|
case MachineOperand::MO_MachineBasicBlock:
|
|
case MachineOperand::MO_GlobalAddress:
|
|
case MachineOperand::MO_ExternalSymbol:
|
|
case MachineOperand::MO_JumpTableIndex:
|
|
case MachineOperand::MO_ConstantPoolIndex:
|
|
case MachineOperand::MO_BlockAddress:
|
|
return LowerSymbolOperand(MO, MOTy, offset);
|
|
case MachineOperand::MO_RegisterMask:
|
|
break;
|
|
}
|
|
|
|
return MCOperand();
|
|
}
|
|
|
|
void XCoreMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
|
|
OutMI.setOpcode(MI->getOpcode());
|
|
|
|
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
|
|
const MachineOperand &MO = MI->getOperand(i);
|
|
MCOperand MCOp = LowerOperand(MO);
|
|
|
|
if (MCOp.isValid())
|
|
OutMI.addOperand(MCOp);
|
|
}
|
|
}
|