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/MC/MCInstrInfo.h"
#include "llvm/MC/MCSubtargetInfo.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 MCInstrInfo &MCII;
  const MCSubtargetInfo &STI;

public:
  ARMMCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti,
                   MCContext &ctx)
    : MCII(mcii), STI(sti) {
  }

  ~ARMMCCodeEmitter() {}

  bool isThumb() const {
    // FIXME: Can tablegen auto-generate this?
    return (STI.getFeatureBits() & ARM::ModeThumb) != 0;
  }
  bool isThumb2() const {
    return isThumb() && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0;
  }
  bool isTargetDarwin() const {
    Triple TT(STI.getTargetTriple());
    Triple::OSType OS = TT.getOS();
    return OS == Triple::Darwin || OS == Triple::MacOSX || OS == Triple::IOS;
  }

  unsigned getMachineSoImmOpValue(unsigned SoImm) const;

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