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EpiphanyMCInstLower.cpp
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EpiphanyMCInstLower.cpp
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//===-- EpiphanyMCInstLower.cpp - Convert Epiphany MachineInstr to an MCInst -==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains code to lower Epiphany MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "EpiphanyMCInstLower.h"
#include "EpiphanyTargetMachine.h"
#include "MCTargetDesc/EpiphanyMCExpr.h"
#include "Utils/EpiphanyBaseInfo.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Mangler.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
MCSymbol *EpiphanyMCInstLower::
GetGlobalAddressSymbol(const MachineOperand &MO) const {
switch (MO.getTargetFlags()) {
case 0:
break;
default:
llvm_unreachable("Unknown target flag on GV operand");
}
return Printer.getSymbol(MO.getGlobal());
}
MCSymbol *EpiphanyMCInstLower::
GetExternalSymbolSymbol(const MachineOperand &MO) const {
switch (MO.getTargetFlags()) {
case 0:
break;
default:
llvm_unreachable("Unknown target flag on GV operand");
}
return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
}
MCSymbol *EpiphanyMCInstLower::
GetJumpTableSymbol(const MachineOperand &MO) const {
const DataLayout *DL = Printer.TM.getDataLayout();
SmallString<256> Name;
raw_svector_ostream(Name) << DL->getPrivateGlobalPrefix() << "CPI"
<< Printer.getFunctionNumber() << '_'
<< MO.getIndex();
switch (MO.getTargetFlags()) {
case 0:
break;
default:
llvm_unreachable("Unknown target flag on GV operand");
}
// Create a symbol for the name.
return Ctx.getOrCreateSymbol(Name);
}
MCSymbol *EpiphanyMCInstLower::
GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
const DataLayout *DL = Printer.TM.getDataLayout();
SmallString<256> Name;
raw_svector_ostream(Name) << DL->getPrivateGlobalPrefix() << "CPI"
<< Printer.getFunctionNumber() << '_'
<< MO.getIndex();
switch (MO.getTargetFlags()) {
case 0:
break;
default:
llvm_unreachable("Unknown target flag on GV operand");
}
// Create a symbol for the name.
return Ctx.getOrCreateSymbol(Name);
}
MCSymbol *EpiphanyMCInstLower::
GetBlockAddressSymbol(const MachineOperand &MO) const {
switch (MO.getTargetFlags()) {
case 0:
break;
default:
llvm_unreachable("Unknown target flag on GV operand");
}
return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
}
MCOperand EpiphanyMCInstLower::
LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
switch (MO.getTargetFlags()) {
case EpiphanyII::MO_LO16:
Expr = EpiphanyMCExpr::createLo16(Expr, Ctx);
break;
case EpiphanyII::MO_HI16:
Expr = EpiphanyMCExpr::createHi16(Expr, Ctx);
break;
case EpiphanyII::MO_NO_FLAG:
// Expr is already correct
break;
default:
llvm_unreachable("Unexpected MachineOperand flag - lowersymboloperand");
}
if (!MO.isJTI() && MO.getOffset())
Expr = MCBinaryExpr::createAdd(Expr,
MCConstantExpr::create(MO.getOffset(), Ctx),
Ctx);
return MCOperand::createExpr(Expr);
}
bool EpiphanyMCInstLower::lowerOperand(const MachineOperand &MO,
MCOperand &MCOp) const {
switch (MO.getType()) {
default:
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
if (MO.isImplicit())
return false;
assert(!MO.getSubReg() && "Subregs should be eliminated!");
MCOp = MCOperand::createReg(MO.getReg());
break;
case MachineOperand::MO_Immediate:
MCOp = MCOperand::createImm(MO.getImm());
break;
case MachineOperand::MO_FPImmediate: {// a bit hacky, see arm
APFloat Val = MO.getFPImm()->getValueAPF();
bool ignored;
Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
MCOp = MCOperand::createFPImm(Val.convertToDouble());
break;
}
case MachineOperand::MO_BlockAddress:
MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
break;
case MachineOperand::MO_ExternalSymbol:
MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
break;
case MachineOperand::MO_GlobalAddress:
MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
break;
case MachineOperand::MO_MachineBasicBlock:
MCOp = MCOperand::createExpr(MCSymbolRefExpr::create(
MO.getMBB()->getSymbol(), Ctx));
break;
case MachineOperand::MO_JumpTableIndex:
MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
break;
case MachineOperand::MO_ConstantPoolIndex:
MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
break;
case MachineOperand::MO_RegisterMask:
// Ignore call clobbers
return false;
}
return true;
}
void EpiphanyMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
OutMI.setOpcode(MI->getOpcode());
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MCOperand MCOp;
if (lowerOperand(MI->getOperand(i), MCOp))
OutMI.addOperand(MCOp);
}
}