1 /*
   2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 
  26 #ifndef __DECODER_HPP
  27 #define __DECODER_HPP
  28 
  29 #include "memory/allocation.hpp"
  30 
  31 #ifdef _WINDOWS
  32 #include <windows.h>
  33 #include <imagehlp.h>
  34 
  35 // functions needed for decoding symbols
  36 typedef DWORD (WINAPI *pfn_SymSetOptions)(DWORD);
  37 typedef BOOL  (WINAPI *pfn_SymInitialize)(HANDLE, PCTSTR, BOOL);
  38 typedef BOOL  (WINAPI *pfn_SymGetSymFromAddr64)(HANDLE, DWORD64, PDWORD64, PIMAGEHLP_SYMBOL64);
  39 typedef DWORD (WINAPI *pfn_UndecorateSymbolName)(const char*, char*, DWORD, DWORD);
  40 
  41 #else
  42 
  43 class ElfFile;
  44 
  45 #endif // _WINDOWS
  46 
  47 
  48 class Decoder: public StackObj {
  49 
  50  public:
  51   // status code for decoding native C frame
  52   enum decoder_status {
  53          no_error,             // successfully decoded frames
  54          out_of_memory,        // out of memory
  55          file_invalid,         // invalid elf file
  56          file_not_found,       // could not found symbol file (on windows), such as jvm.pdb or jvm.map
  57          helper_not_found,     // could not load dbghelp.dll (Windows only)
  58          helper_func_error,    // decoding functions not found (Windows only)
  59          helper_init_error,    // SymInitialize failed (Windows only)
  60          symbol_not_found      // could not find the symbol
  61   };
  62 
  63  public:
  64   Decoder() { initialize(); };
  65   ~Decoder() { uninitialize(); };
  66 
  67   static bool can_decode_C_frame_in_vm();
  68 
  69   static void initialize();
  70   static void uninitialize();
  71 
  72 #ifdef _WINDOWS
  73   static decoder_status    decode(address addr, char *buf, int buflen, int *offset);
  74 #else
  75   static decoder_status    decode(address addr, const char* filepath, char *buf, int buflen, int *offset);
  76 #endif
  77 
  78   static bool              demangle(const char* symbol, char *buf, int buflen);
  79 
  80   static decoder_status    get_status() { return _decoder_status; };
  81 
  82 #ifndef _WINDOWS
  83  private:
  84   static ElfFile*         get_elf_file(const char* filepath);
  85 #endif // _WINDOWS
  86 
  87 
  88  private:
  89   static decoder_status     _decoder_status;
  90   static bool               _initialized;
  91 
  92 #ifdef _WINDOWS
  93   static HMODULE                   _dbghelp_handle;
  94   static bool                      _can_decode_in_vm;
  95   static pfn_SymGetSymFromAddr64   _pfnSymGetSymFromAddr64;
  96   static pfn_UndecorateSymbolName  _pfnUndecorateSymbolName;
  97 #else
  98   static ElfFile*                  _opened_elf_files;
  99 #endif // _WINDOWS
 100 };
 101 
 102 #endif // __DECODER_HPP