path: root/lib/Target/ARM/ARMMCCodeEmitter.cpp

//===-- ARM/ARMMCCodeEmitter.cpp - Convert ARM 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 ARMMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "mccodeemitter"
#include "ARM.h"
#include "ARMAddressingModes.h"
#include "ARMFixupKinds.h"
#include "ARMInstrInfo.h"
#include "ARMMCExpr.h"
#include "ARMSubtarget.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;

STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");

namespace {
class ARMMCCodeEmitter : public MCCodeEmitter {
  ARMMCCodeEmitter(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
  void operator=(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
  const TargetMachine &TM;
  const TargetInstrInfo &TII;
  const ARMSubtarget *Subtarget;
  MCContext &Ctx;

public:
  ARMMCCodeEmitter(TargetMachine &tm, MCContext &ctx)
    : TM(tm), TII(*TM.getInstrInfo()),
      Subtarget(&TM.getSubtarget<ARMSubtarget>()), Ctx(ctx) {
  }

  ~ARMMCCodeEmitter() {}

  unsigned getMachineSoImmOpValue(unsigned SoImm) const;

  // getBinaryCodeForInstr - TableGen'erated function for getting the
  // binary encoding for an instruction.
  unsigned 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;

  /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
  /// the specified operand. This is used for operands with :lower16: and
  /// :upper16: prefixes.
  uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
                               SmallVectorImpl<MCFixup> &Fixups) const;

  bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
                              unsigned &Reg, unsigned &Imm,
                              SmallVectorImpl<MCFixup> &Fixups) const;

  /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
  /// BL branch target.
  uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
                                   SmallVectorImpl<MCFixup> &