jdk8-mips64-public/hotspot: src/share/vm/utilities/elfSymbolTable.cpp@2d4762ec74af

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

     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/elfSymbolTable.hpp"

    32 ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {

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

    34   m_symbols = NULL;

    35   m_next = NULL;

    36   m_file = file;

    37   m_status = Decoder::no_error;

    39   // try to load the string table

    40   long cur_offset = ftell(file);

    41   if (cur_offset != -1) {

    42     m_symbols = (Elf_Sym*)NEW_C_HEAP_ARRAY(char, shdr.sh_size);

    43     if (m_symbols) {

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

    45         fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||

    46         fseek(file, cur_offset, SEEK_SET)) {

    47         m_status = Decoder::file_invalid;

    48         FREE_C_HEAP_ARRAY(char, m_symbols);

    49         m_symbols = NULL;

    50       }

    51     }

    52     if (m_status == Decoder::no_error) {

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

    54     }

    55   } else {

    56     m_status = Decoder::file_invalid;

    57   }

    58 }

    60 ElfSymbolTable::~ElfSymbolTable() {

    61   if (m_symbols != NULL) {

    62     FREE_C_HEAP_ARRAY(char, m_symbols);

    63   }

    65   if (m_next != NULL) {

    66     delete m_next;

    67   }

    68 }

    70 Decoder::decoder_status ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) {

    71   assert(stringtableIndex, "null string table index pointer");

    72   assert(posIndex, "null string table offset pointer");

    73   assert(offset, "null offset pointer");

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

    76     return m_status;

    77   }

    79   address pc = 0;

    80   size_t  sym_size = sizeof(Elf_Sym);

    81   assert((m_shdr.sh_size % sym_size) == 0, "check size");

    82   int count = m_shdr.sh_size / sym_size;

    83   if (m_symbols != NULL) {

    84     for (int index = 0; index < count; index ++) {

    85       if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {

    86         address sym_addr = (address)m_symbols[index].st_value;

    87         if (sym_addr < addr && (addr - sym_addr) < *offset) {

    88           pc = (address)m_symbols[index].st_value;

    89           *offset = (int)(addr - pc);

    90           *posIndex = m_symbols[index].st_name;

    91           *stringtableIndex = m_shdr.sh_link;

    92         }

    93       }

    94     }

    95   } else {

    96     long cur_pos;

    97     if ((cur_pos = ftell(m_file)) == -1 ||

    98       fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {

    99       m_status = Decoder::file_invalid;

   100       return m_status;

   101     }

   103     Elf_Sym sym;

   104     for (int index = 0; index < count; index ++) {

   105       if (fread(&sym, sym_size, 1, m_file) == 1) {

   106         if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {

   107           address sym_addr = (address)sym.st_value;

   108           if (sym_addr < addr && (addr - sym_addr) < *offset) {

   109             pc = (address)sym.st_value;

   110             *offset = (int)(addr - pc);

   111             *posIndex = sym.st_name;

   112             *stringtableIndex = m_shdr.sh_link;

   113           }

   114         }

   115       } else {

   116         m_status = Decoder::file_invalid;

   117         return m_status;

   118       }

   119     }

   120     fseek(m_file, cur_pos, SEEK_SET);

   121   }

   122   return m_status;

   123 }

   125 #endif // _WINDOWS

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

src/share/vm/utilities/elfSymbolTable.cpp@2d4762ec74af

src/share/vm/utilities/elfSymbolTable.cpp