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//===-- SparcMCCodeEmitter.cpp - Convert Sparc code to machine code -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the SparcMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mccodeemitter"
#include "SparcMCTargetDesc.h"
#include "MCTargetDesc/SparcFixupKinds.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
namespace {
class SparcMCCodeEmitter : public MCCodeEmitter {
SparcMCCodeEmitter(const SparcMCCodeEmitter &) LLVM_DELETED_FUNCTION;
void operator=(const SparcMCCodeEmitter &) LLVM_DELETED_FUNCTION;
MCContext &Ctx;
public:
SparcMCCodeEmitter(MCContext &ctx): Ctx(ctx) {}
~SparcMCCodeEmitter() {}
void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups) const;
// getBinaryCodeForInstr - TableGen'erated function for getting the
// binary encoding for an instruction.
uint64_t getBinaryCodeForInstr(const MCInst &MI,
SmallVectorImpl<MCFixup> &Fixups) const;
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups) const;
unsigned getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups) const;
unsigned getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups) const;
};
} // end anonymous namespace
MCCodeEmitter *llvm::createSparcMCCodeEmitter(const MCInstrInfo &MCII,
const MCRegisterInfo &MRI,
const MCSubtargetInfo &STI,
MCContext &Ctx) {
return new SparcMCCodeEmitter(Ctx);
}
void SparcMCCodeEmitter::
EncodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups) const {
unsigned Bits = getBinaryCodeForInstr(MI, Fixups);
// Output the constant in big endian byte order.
for (unsigned i = 0; i != 4; ++i) {
OS << (char)(Bits >> 24);
Bits <<= 8;
}
++MCNumEmitted; // Keep track of the # of mi's emitted.
}
unsigned SparcMCCodeEmitter::
getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups) const {
if (MO.isReg())
return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
if (MO.isImm())
return MO.getImm();
assert(MO.isExpr());
const MCExpr *Expr = MO.getExpr();
int64_t Res;
if (Expr->EvaluateAsAbsolute(Res))
return Res;
assert(0 && "Unhandled expression!");
return 0;
}
unsigned SparcMCCodeEmitter::
getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isReg() || MO.isImm())
return getMachineOpValue(MI, MO, Fixups);
Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
(MCFixupKind)Sparc::fixup_sparc_call30));
return 0;
}
unsigned SparcMCCodeEmitter::
getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isReg() || MO.isImm())
return getMachineOpValue(MI, MO, Fixups);
Sparc::Fixups fixup = Sparc::fixup_sparc_br22;
if (MI.getOpcode() == SP::BPXCC)
fixup = Sparc::fixup_sparc_br19;
Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
(MCFixupKind)fixup));
return 0;
}
#include "SparcGenMCCodeEmitter.inc"