hotspot/src/share/vm/utilities/elfSymbolTable.cpp
author coleenp
Thu, 03 Feb 2011 21:30:08 -0500
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child 8921 14bfe81f2a9d
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7017009: Secondary out of c-heap memory error reporting out of memory Summary: Use os::malloc() to allocate buffer to read elf symbols and check for null Reviewed-by: zgu, phh, dsamersoff, dholmes, dcubed
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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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#ifndef _WINDOWS
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#include "memory/allocation.inline.hpp"
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#include "utilities/elfSymbolTable.hpp"
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ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
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  assert(file, "null file handle");
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  m_symbols = NULL;
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  m_next = NULL;
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  m_file = file;
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  m_status = Decoder::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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  if (cur_offset != -1) {
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    // call malloc so we can back up if memory allocation fails.
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    m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size);
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    if (m_symbols) {
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      if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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        fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
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        fseek(file, cur_offset, SEEK_SET)) {
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        m_status = Decoder::file_invalid;
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        os::free(m_symbols);
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        m_symbols = NULL;
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      }
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    }
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    if (m_status == Decoder::no_error) {
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      memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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    }
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  } else {
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    m_status = Decoder::file_invalid;
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  }
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}
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ElfSymbolTable::~ElfSymbolTable() {
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  if (m_symbols != NULL) {
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    os::free(m_symbols);
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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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Decoder::decoder_status ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) {
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  assert(stringtableIndex, "null string table index pointer");
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  assert(posIndex, "null string table offset pointer");
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  assert(offset, "null offset pointer");
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  if (m_status != Decoder::no_error) {
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    return m_status;
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  }
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  address pc = 0;
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  size_t  sym_size = sizeof(Elf_Sym);
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  assert((m_shdr.sh_size % sym_size) == 0, "check size");
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  int count = m_shdr.sh_size / sym_size;
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  if (m_symbols != NULL) {
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    for (int index = 0; index < count; index ++) {
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      if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
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        address sym_addr = (address)m_symbols[index].st_value;
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        if (sym_addr < addr && (addr - sym_addr) < *offset) {
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          pc = (address)m_symbols[index].st_value;
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          *offset = (int)(addr - pc);
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          *posIndex = m_symbols[index].st_name;
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          *stringtableIndex = m_shdr.sh_link;
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        }
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      }
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    }
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  } else {
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    long cur_pos;
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    if ((cur_pos = ftell(m_file)) == -1 ||
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      fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
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      m_status = Decoder::file_invalid;
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      return m_status;
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    }
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    Elf_Sym sym;
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    for (int index = 0; index < count; index ++) {
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      if (fread(&sym, sym_size, 1, m_file) == 1) {
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        if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
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          address sym_addr = (address)sym.st_value;
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          if (sym_addr < addr && (addr - sym_addr) < *offset) {
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            pc = (address)sym.st_value;
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            *offset = (int)(addr - pc);
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            *posIndex = sym.st_name;
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            *stringtableIndex = m_shdr.sh_link;
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          }
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        }
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      } else {
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        m_status = Decoder::file_invalid;
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        return m_status;
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      }
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    }
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    fseek(m_file, cur_pos, SEEK_SET);
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  }
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  return m_status;
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}
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#endif // _WINDOWS