#include "runtime/mutexLocker.hpp"

#if defined(_WINDOWS)

  #include "decoder_windows.hpp"

#elif defined(__APPLE__)

  #include "decoder_machO.hpp"

#else

  #include "decoder_elf.hpp"

#endif

NullDecoder*  Decoder::_decoder = NULL;

NullDecoder   Decoder::_do_nothing_decoder;

Mutex*           Decoder::_decoder_lock = new Mutex(Mutex::safepoint,

                                "DecoderLock");

// _decoder_lock should already acquired before enter this method

NullDecoder* Decoder::get_decoder() {

  assert(_decoder_lock != NULL && _decoder_lock->owned_by_self(),

    "Require DecoderLock to enter");

  if (_decoder != NULL) {

    return _decoder;

  // Decoder is a secondary service. Although, it is good to have,

  // but we can live without it.

#if defined(_WINDOWS)

  _decoder = new (std::nothrow) WindowsDecoder();

#elif defined (__APPLE__)

    _decoder = new (std::nothrow)MachODecoder();

#else

    _decoder = new (std::nothrow)ElfDecoder();

#endif

  if (_decoder == NULL || _decoder->has_error()) {

    if (_decoder != NULL) {

      delete _decoder;

    _decoder = &_do_nothing_decoder;

  return _decoder;

}

bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {

  assert(_decoder_lock != NULL, "Just check");

  MutexLockerEx locker(_decoder_lock, true);

  NullDecoder* decoder = get_decoder();

  assert(decoder != NULL, "null decoder");

  return decoder->decode(addr, buf, buflen, offset, modulepath);

bool Decoder::demangle(const char* symbol, char* buf, int buflen) {

  assert(_decoder_lock != NULL, "Just check");

  MutexLockerEx locker(_decoder_lock, true);

  NullDecoder* decoder = get_decoder();

  assert(decoder != NULL, "null decoder");

  return decoder->demangle(symbol, buf, buflen);

}

bool Decoder::can_decode_C_frame_in_vm() {

  assert(_decoder_lock != NULL, "Just check");

  MutexLockerEx locker(_decoder_lock, true);

  NullDecoder* decoder = get_decoder();

  assert(decoder != NULL, "null decoder");

  return decoder->can_decode_C_frame_in_vm();

}

// shutdown real decoder and replace it with

// _do_nothing_decoder

void Decoder::shutdown() {

  assert(_decoder_lock != NULL, "Just check");

  MutexLockerEx locker(_decoder_lock, true);

  if (_decoder != NULL && _decoder != &_do_nothing_decoder) {

    delete _decoder;

  _decoder = &_do_nothing_decoder;