hotspot/src/share/vm/utilities/decoder.cpp
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7003748: Decode C stack frames when symbols are presented (PhoneHome project) Summary: Implemented in-process C native stack frame decoding when symbols are available. Reviewed-by: coleenp, never
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/*
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 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "prims/jvm.h"
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#include "utilities/decoder.hpp"
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Decoder::decoder_status  Decoder::_decoder_status = Decoder::no_error;
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bool                     Decoder::_initialized = false;
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#ifndef _WINDOWS
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// Implementation of common functionalities among Solaris and Linux
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#include "utilities/elfFile.hpp"
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ElfFile* Decoder::_opened_elf_files = NULL;
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bool Decoder::can_decode_C_frame_in_vm() {
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  return true;
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}
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void Decoder::initialize() {
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  _initialized = true;
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}
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void Decoder::uninitialize() {
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  if (_opened_elf_files != NULL) {
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    delete _opened_elf_files;
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    _opened_elf_files = NULL;
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  }
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  _initialized = false;
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}
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Decoder::decoder_status Decoder::decode(address addr, const char* filepath, char *buf, int buflen, int *offset) {
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  if (_decoder_status != no_error) {
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    return _decoder_status;
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  }
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  ElfFile* file = get_elf_file(filepath);
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  if (_decoder_status != no_error) {
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    return _decoder_status;
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  }
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  const char* symbol = file->decode(addr, offset);
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  if (file->get_status() == out_of_memory) {
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    _decoder_status = out_of_memory;
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    return _decoder_status;
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  } else if (symbol != NULL) {
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    if (!demangle(symbol, buf, buflen)) {
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      jio_snprintf(buf, buflen, "%s", symbol);
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    }
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    return no_error;
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  } else {
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    return symbol_not_found;
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  }
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}
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ElfFile* Decoder::get_elf_file(const char* filepath) {
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  if (_decoder_status != no_error) {
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    return NULL;
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  }
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  ElfFile* file = _opened_elf_files;
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  while (file != NULL) {
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    if (file->same_elf_file(filepath)) {
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      return file;
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    }
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    file = file->m_next;
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  }
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  file = new ElfFile(filepath);
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  if (file == NULL) {
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    _decoder_status = out_of_memory;
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  }
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  if (_opened_elf_files != NULL) {
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    file->m_next = _opened_elf_files;
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  }
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  _opened_elf_files = file;
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  return file;
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}
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#endif
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