Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2012, 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.

  *

  */

 #include "precompiled.hpp"

 #include "prims/jvm.h"

 #include "decoder_windows.hpp"

 WindowsDecoder::WindowsDecoder() {

   _dbghelp_handle = NULL;

   _can_decode_in_vm = false;

   _pfnSymGetSymFromAddr64 = NULL;

   _pfnUndecorateSymbolName = NULL;

   _decoder_status = no_error;

   initialize();

 }

 void WindowsDecoder::initialize() {

   if (!has_error() && _dbghelp_handle == NULL) {

     HMODULE handle = ::LoadLibrary("dbghelp.dll");

     if (!handle) {

       _decoder_status = helper_not_found;

       return;

     }

     _dbghelp_handle = handle;

     pfn_SymSetOptions _pfnSymSetOptions = (pfn_SymSetOptions)::GetProcAddress(handle, "SymSetOptions");

     pfn_SymInitialize _pfnSymInitialize = (pfn_SymInitialize)::GetProcAddress(handle, "SymInitialize");

     _pfnSymGetSymFromAddr64 = (pfn_SymGetSymFromAddr64)::GetProcAddress(handle, "SymGetSymFromAddr64");

     _pfnUndecorateSymbolName = (pfn_UndecorateSymbolName)::GetProcAddress(handle, "UnDecorateSymbolName");

     if (_pfnSymSetOptions == NULL || _pfnSymInitialize == NULL || _pfnSymGetSymFromAddr64 == NULL) {

       _pfnSymGetSymFromAddr64 = NULL;

       _pfnUndecorateSymbolName = NULL;

       ::FreeLibrary(handle);

       _dbghelp_handle = NULL;

       _decoder_status = helper_func_error;

       return;

     }

     HANDLE hProcess = ::GetCurrentProcess();

     _pfnSymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS | SYMOPT_EXACT_SYMBOLS);

     if (!_pfnSymInitialize(hProcess, NULL, TRUE)) {

       _pfnSymGetSymFromAddr64 = NULL;

       _pfnUndecorateSymbolName = NULL;

       ::FreeLibrary(handle);

       _dbghelp_handle = NULL;

       _decoder_status = helper_init_error;

       return;

     }

     // set pdb search paths

     pfn_SymSetSearchPath  _pfn_SymSetSearchPath =

       (pfn_SymSetSearchPath)::GetProcAddress(handle, "SymSetSearchPath");

     pfn_SymGetSearchPath  _pfn_SymGetSearchPath =

       (pfn_SymGetSearchPath)::GetProcAddress(handle, "SymGetSearchPath");

     if (_pfn_SymSetSearchPath != NULL && _pfn_SymGetSearchPath != NULL) {

       char paths[MAX_PATH];

       int  len = sizeof(paths);

       if (!_pfn_SymGetSearchPath(hProcess, paths, len)) {

         paths[0] = '\0';

       } else {

         // available spaces in path buffer

         len -= (int)strlen(paths);

       }

       char tmp_path[MAX_PATH];

       DWORD dwSize;

       HMODULE hJVM = ::GetModuleHandle("jvm.dll");

       tmp_path[0] = '\0';

       // append the path where jvm.dll is located

       if (hJVM != NULL && (dwSize = ::GetModuleFileName(hJVM, tmp_path, sizeof(tmp_path))) > 0) {

         while (dwSize > 0 && tmp_path[dwSize] != '\\') {

           dwSize --;

         }

         tmp_path[dwSize] = '\0';

         if (dwSize > 0 && len > (int)dwSize + 1) {

           strncat(paths, os::path_separator(), 1);

           strncat(paths, tmp_path, dwSize);

           len -= dwSize + 1;

         }

       }

       // append $JRE/bin. Arguments::get_java_home actually returns $JRE

       // path

       char *p = Arguments::get_java_home();

       assert(p != NULL, "empty java home");

       size_t java_home_len = strlen(p);

       if (len > (int)java_home_len + 5) {

         strncat(paths, os::path_separator(), 1);

         strncat(paths, p, java_home_len);

         strncat(paths, "\\bin", 4);

         len -= (int)(java_home_len + 5);

       }

       // append $JDK/bin path if it exists

       assert(java_home_len < MAX_PATH, "Invalid path length");

       // assume $JRE is under $JDK, construct $JDK/bin path and

       // see if it exists or not

       if (strncmp(&p[java_home_len - 3], "jre", 3) == 0) {

         strncpy(tmp_path, p, java_home_len - 3);

         tmp_path[java_home_len - 3] = '\0';

         strncat(tmp_path, "bin", 3);

         // if the directory exists

         DWORD dwAttrib = GetFileAttributes(tmp_path);

         if (dwAttrib != INVALID_FILE_ATTRIBUTES &&

             (dwAttrib & FILE_ATTRIBUTE_DIRECTORY)) {

           // tmp_path should have the same length as java_home_len, since we only

           // replaced 'jre' with 'bin'

           if (len > (int)java_home_len + 1) {

             strncat(paths, os::path_separator(), 1);

             strncat(paths, tmp_path, java_home_len);

           }

         }

       }

       _pfn_SymSetSearchPath(hProcess, paths);

     }

      // find out if jvm.dll contains private symbols, by decoding

      // current function and comparing the result

      address addr = (address)Decoder::demangle;

      char buf[MAX_PATH];

      if (decode(addr, buf, sizeof(buf), NULL)) {

        _can_decode_in_vm = !strcmp(buf, "Decoder::demangle");

      }

   }

 }

 void WindowsDecoder::uninitialize() {

   _pfnSymGetSymFromAddr64 = NULL;

   _pfnUndecorateSymbolName = NULL;

   if (_dbghelp_handle != NULL) {

     ::FreeLibrary(_dbghelp_handle);

   }

   _dbghelp_handle = NULL;

 }

 bool WindowsDecoder::can_decode_C_frame_in_vm() const {

   return  (!has_error() && _can_decode_in_vm);

 }

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

   if (_pfnSymGetSymFromAddr64 != NULL) {

     PIMAGEHLP_SYMBOL64 pSymbol;

     char symbolInfo[MAX_PATH + sizeof(IMAGEHLP_SYMBOL64)];

     pSymbol = (PIMAGEHLP_SYMBOL64)symbolInfo;

     pSymbol->MaxNameLength = MAX_PATH;

     pSymbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);

     DWORD64 displacement;

     if (_pfnSymGetSymFromAddr64(::GetCurrentProcess(), (DWORD64)addr, &displacement, pSymbol)) {

       if (buf != NULL) {

         if (demangle(pSymbol->Name, buf, buflen)) {

           jio_snprintf(buf, buflen, "%s", pSymbol->Name);

         }

       }

       if(offset != NULL) *offset = (int)displacement;

       return true;

     }

   }

   if (buf != NULL && buflen > 0) buf[0] = '\0';

   if (offset != NULL) *offset = -1;

   return false;

 }

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

   return _pfnUndecorateSymbolName != NULL &&

          _pfnUndecorateSymbolName(symbol, buf, buflen, UNDNAME_COMPLETE);

 }