jdk8-mips64-public/hotspot: src/share/vm/utilities/elfStringTable.cpp@36c186bcc085

6302804: Hotspot VM dies ungraceful death when C heap is exhausted in various places.
Summary: enhance the error reporting mechanism to help user to fix the problem rather than making it look like a VM error.
Reviewed-by: kvn, kamg

     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  */

    25 #include "precompiled.hpp"

    27 #ifndef _WINDOWS

    29 #include "memory/allocation.inline.hpp"

    30 #include "utilities/elfStringTable.hpp"

    32 // We will try to load whole string table into memory if we can.

    33 // Otherwise, fallback to more expensive file operation.

    34 ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {

    35   assert(file, "null file handle");

    36   m_table = NULL;

    37   m_index = index;

    38   m_next = NULL;

    39   m_file = file;

    40   m_status = Decoder::no_error;

    42   // try to load the string table

    43   long cur_offset = ftell(file);

    44   m_table = (char*)NEW_C_HEAP_ARRAY(char, shdr.sh_size);

    45   if (m_table != NULL) {

    46     // if there is an error, mark the error

    47     if (fseek(file, shdr.sh_offset, SEEK_SET) ||

    48       fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||

    49       fseek(file, cur_offset, SEEK_SET)) {

    50       m_status = Decoder::file_invalid;

    51       FREE_C_HEAP_ARRAY(char, m_table);

    52       m_table = NULL;

    53     }

    54   } else {

    55     memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));

    56   }

    57 }

    59 ElfStringTable::~ElfStringTable() {

    60   if (m_table != NULL) {

    61     FREE_C_HEAP_ARRAY(char, m_table);

    62   }

    64   if (m_next != NULL) {

    65     delete m_next;

    66   }

    67 }

    69 const char* ElfStringTable::string_at(int pos) {

    70   if (m_status != Decoder::no_error) {

    71     return NULL;

    72   }

    73   if (m_table != NULL) {

    74     return (const char*)(m_table + pos);

    75   } else {

    76     long cur_pos = ftell(m_file);

    77     if (cur_pos == -1 ||

    78       fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||

    79       fread(m_symbol, 1, MAX_SYMBOL_LEN, m_file) <= 0 ||

    80       fseek(m_file, cur_pos, SEEK_SET)) {

    81       m_status = Decoder::file_invalid;

    82       return NULL;

    83     }

    84     return (const char*)m_symbol;

    85   }

    86 }

    88 #endif // _WINDOWS

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

src/share/vm/utilities/elfStringTable.cpp@36c186bcc085

src/share/vm/utilities/elfStringTable.cpp