llvm-6502/lib/Target/MSP430/AsmPrinter/MSP430MCInstLower.cpp
2010-01-16 01:40:07 +00:00

138 lines
4.4 KiB
C++

//===-- MSP430MCInstLower.cpp - Convert MSP430 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 MSP430 MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "MSP430MCInstLower.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/ADT/SmallString.h"
using namespace llvm;
MCSymbol *MSP430MCInstLower::
GetGlobalAddressSymbol(const MachineOperand &MO) const {
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
case 0: break;
}
return Printer.GetGlobalValueSymbol(MO.getGlobal());
}
MCSymbol *MSP430MCInstLower::
GetExternalSymbolSymbol(const MachineOperand &MO) const {
switch (MO.getTargetFlags()) {
default: assert(0 && "Unknown target flag on GV operand");
case 0: break;
}
return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
}
MCSymbol *MSP430MCInstLower::
GetJumpTableSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
<< Printer.getFunctionNumber() << '_'
<< MO.getIndex();
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
case 0: break;
}
// Create a symbol for the name.
return Ctx.GetOrCreateSymbol(Name.str());
}
MCSymbol *MSP430MCInstLower::
GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
<< Printer.getFunctionNumber() << '_'
<< MO.getIndex();
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
case 0: break;
}
// Create a symbol for the name.
return Ctx.GetOrCreateSymbol(Name.str());
}
MCOperand MSP430MCInstLower::
LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
// FIXME: We would like an efficient form for this, so we don't have to do a
// lot of extra uniquing.
const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
case 0: break;
}
if (!MO.isJTI() && MO.getOffset())
Expr = MCBinaryExpr::CreateAdd(Expr,
MCConstantExpr::Create(MO.getOffset(), Ctx),
Ctx);
return MCOperand::CreateExpr(Expr);
}
void MSP430MCInstLower::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;
switch (MO.getType()) {
default:
MI->dump();
assert(0 && "unknown operand type");
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit()) continue;
MCOp = MCOperand::CreateReg(MO.getReg());
break;
case MachineOperand::MO_Immediate:
MCOp = MCOperand::CreateImm(MO.getImm());
break;
case MachineOperand::MO_MachineBasicBlock:
MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
Printer.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
break;
case MachineOperand::MO_GlobalAddress:
MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
break;
case MachineOperand::MO_ExternalSymbol:
MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
break;
case MachineOperand::MO_JumpTableIndex:
MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
break;
case MachineOperand::MO_ConstantPoolIndex:
MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
break;
}
OutMI.addOperand(MCOp);
}
}