/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef __DECODER_HPP

#define __DECODER_HPP

#include "memory/allocation.hpp"

#ifdef _WINDOWS

#include <windows.h>

#include <imagehlp.h>

// functions needed for decoding symbols

typedef DWORD (WINAPI *pfn_SymSetOptions)(DWORD);

typedef BOOL  (WINAPI *pfn_SymInitialize)(HANDLE, PCTSTR, BOOL);

typedef BOOL  (WINAPI *pfn_SymGetSymFromAddr64)(HANDLE, DWORD64, PDWORD64, PIMAGEHLP_SYMBOL64);

typedef DWORD (WINAPI *pfn_UndecorateSymbolName)(const char*, char*, DWORD, DWORD);

#else

class ElfFile;

#endif // _WINDOWS

class Decoder: public StackObj {

 public:

  // status code for decoding native C frame

  enum decoder_status {

         no_error,             // successfully decoded frames

         out_of_memory,        // out of memory

         file_invalid,         // invalid elf file

         file_not_found,       // could not found symbol file (on windows), such as jvm.pdb or jvm.map

         helper_not_found,     // could not load dbghelp.dll (Windows only)

         helper_func_error,    // decoding functions not found (Windows only)

         helper_init_error,    // SymInitialize failed (Windows only)

         symbol_not_found      // could not find the symbol

  };

 public:

  Decoder() { initialize(); };

  ~Decoder() { uninitialize(); };

  static bool can_decode_C_frame_in_vm();

  static void initialize();

  static void uninitialize();

#ifdef _WINDOWS

  static decoder_status    decode(address addr, char *buf, int buflen, int *offset);

#else

  static decoder_status    decode(address addr, const char* filepath, char *buf, int buflen, int *offset);

#endif

  static bool              demangle(const char* symbol, char *buf, int buflen);

  static decoder_status    get_status() { return _decoder_status; };

 private:

  static ElfFile*         get_elf_file(const char* filepath);

#endif // _WINDOWS

 private:

  static decoder_status     _decoder_status;

  static bool               _initialized;

#ifdef _WINDOWS

  static HMODULE                   _dbghelp_handle;

  static bool                      _can_decode_in_vm;

  static pfn_SymGetSymFromAddr64   _pfnSymGetSymFromAddr64;

  static pfn_UndecorateSymbolName  _pfnUndecorateSymbolName;

#else

  static ElfFile*                  _opened_elf_files;

#endif // _WINDOWS

};

#endif // __DECODER_HPP