src/hotspot/share/utilities/elfStringTable.cpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 46560 hotspot/src/share/vm/utilities/elfStringTable.cpp@388aa8d67c80
child 47765 b7c7428eaab9
permissions -rw-r--r--
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/*
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 * Copyright (c) 1997, 2017, 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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#if !defined(_WINDOWS) && !defined(__APPLE__)
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#include "memory/allocation.inline.hpp"
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#include "prims/jvm.h"
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#include "runtime/os.hpp"
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#include "utilities/elfStringTable.hpp"
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// We will try to load whole string table into memory if we can.
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// Otherwise, fallback to more expensive file operation.
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ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
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  assert(file, "null file handle");
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  m_table = NULL;
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  m_index = index;
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  m_next = NULL;
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  m_file = file;
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  m_status = NullDecoder::no_error;
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  // try to load the string table
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  long cur_offset = ftell(file);
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  m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size, mtInternal);
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  if (m_table != NULL) {
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    // if there is an error, mark the error
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    if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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      fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||
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      fseek(file, cur_offset, SEEK_SET)) {
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      m_status = NullDecoder::file_invalid;
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      os::free((void*)m_table);
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      m_table = NULL;
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    }
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  } else {
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    memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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  }
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}
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ElfStringTable::~ElfStringTable() {
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  if (m_table != NULL) {
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    os::free((void*)m_table);
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  }
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  if (m_next != NULL) {
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    delete m_next;
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  }
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}
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bool ElfStringTable::string_at(int pos, char* buf, int buflen) {
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  if (NullDecoder::is_error(m_status)) {
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    return false;
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  }
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  if (m_table != NULL) {
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    jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos));
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    return true;
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  } else {
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    long cur_pos = ftell(m_file);
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    if (cur_pos == -1 ||
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      fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||
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      fread(buf, 1, buflen, m_file) <= 0 ||
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      fseek(m_file, cur_pos, SEEK_SET)) {
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      m_status = NullDecoder::file_invalid;
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      return false;
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    }
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    return true;
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  }
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}
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#endif // !_WINDOWS && !__APPLE__