jdk8-mips64-public/hotspot: src/share/vm/utilities/elfFile.cpp@3582bf76420e (annotated)

src/share/vm/utilities/elfFile.cpp@3582bf76420e (annotated)

src/share/vm/utilities/elfFile.cpp

Thu, 27 Jan 2011 16:11:27 -0800

author: coleenp
date: Thu, 27 Jan 2011 16:11:27 -0800
changeset 2497: 3582bf76420e
parent 2364: 2d4762ec74af
child 2834: 2a3da7eaf4a6
permissions: -rw-r--r--

6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank

 /*
  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #ifndef _WINDOWS
 #include <string.h>
 #include <stdio.h>
 #include <limits.h>
 #include "memory/allocation.inline.hpp"
 #include "utilities/decoder.hpp"
 #include "utilities/elfFile.hpp"
 #include "utilities/elfStringTable.hpp"
 #include "utilities/elfSymbolTable.hpp"
 ElfFile::ElfFile(const char* filepath) {
   assert(filepath, "null file path");
   memset(&m_elfHdr, 0, sizeof(m_elfHdr));
   m_string_tables = NULL;
   m_symbol_tables = NULL;
   m_next = NULL;
   m_status = Decoder::no_error;
   int len = strlen(filepath) + 1;
   m_filepath = NEW_C_HEAP_ARRAY(char, len);
   if (m_filepath != NULL) {
     strcpy((char*)m_filepath, filepath);
     m_file = fopen(filepath, "r");
     if (m_file != NULL) {
       load_tables();
     } else {
       m_status = Decoder::file_not_found;
     }
   } else {
     m_status = Decoder::out_of_memory;
   }
 }
 ElfFile::~ElfFile() {
   if (m_string_tables != NULL) {
     delete m_string_tables;
   }
   if (m_symbol_tables != NULL) {
     delete m_symbol_tables;
   }
   if (m_file != NULL) {
     fclose(m_file);
   }
   if (m_filepath != NULL) {
     FREE_C_HEAP_ARRAY(char, m_filepath);
   }
   if (m_next != NULL) {
     delete m_next;
   }
 };
 //Check elf header to ensure the file is valid.
 bool ElfFile::is_elf_file(Elf_Ehdr& hdr) {
   return (ELFMAG0 == hdr.e_ident[EI_MAG0] &&
       ELFMAG1 == hdr.e_ident[EI_MAG1] &&
       ELFMAG2 == hdr.e_ident[EI_MAG2] &&
       ELFMAG3 == hdr.e_ident[EI_MAG3] &&
       ELFCLASSNONE != hdr.e_ident[EI_CLASS] &&
       ELFDATANONE != hdr.e_ident[EI_DATA]);
 }
 bool ElfFile::load_tables() {
   assert(m_file, "file not open");
   assert(m_status == Decoder::no_error, "already in error");
   // read elf file header
   if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) {
     m_status = Decoder::file_invalid;
     return false;
   }
   if (!is_elf_file(m_elfHdr)) {
     m_status = Decoder::file_invalid;
     return false;
   }
   // walk elf file's section headers, and load string tables
   Elf_Shdr shdr;
   if (!fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
     if (m_status != Decoder::no_error) return false;
     for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
       if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
         m_status = Decoder::file_invalid;
         return false;
       }
       // string table
       if (shdr.sh_type == SHT_STRTAB) {
         ElfStringTable* table = new ElfStringTable(m_file, shdr, index);
         if (table == NULL) {
           m_status = Decoder::out_of_memory;
           return false;
         }
         add_string_table(table);
       } else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) {
         ElfSymbolTable* table = new ElfSymbolTable(m_file, shdr);
         if (table == NULL) {
           m_status = Decoder::out_of_memory;
           return false;
         }
         add_symbol_table(table);
       }
     }
   }
   return true;
 }
 const char* ElfFile::decode(address addr, int* offset) {
   // something already went wrong, just give up
   if (m_status != Decoder::no_error) {
     return NULL;
   }
   ElfSymbolTable* symbol_table = m_symbol_tables;
   int string_table_index;
   int pos_in_string_table;
   int off = INT_MAX;
   bool found_symbol = false;
   while (symbol_table != NULL) {
     if (Decoder::no_error == symbol_table->lookup(addr, &string_table_index, &pos_in_string_table, &off)) {
       found_symbol = true;
     }
     symbol_table = symbol_table->m_next;
   }
   if (!found_symbol) return NULL;
   ElfStringTable* string_table = get_string_table(string_table_index);
   if (string_table == NULL) {
     m_status = Decoder::file_invalid;
     return NULL;
   }
   if (offset) *offset = off;
   return string_table->string_at(pos_in_string_table);
 }
 void ElfFile::add_symbol_table(ElfSymbolTable* table) {
   if (m_symbol_tables == NULL) {
     m_symbol_tables = table;
   } else {
     table->m_next = m_symbol_tables;
     m_symbol_tables = table;
   }
 }
 void ElfFile::add_string_table(ElfStringTable* table) {
   if (m_string_tables == NULL) {
     m_string_tables = table;
   } else {
     table->m_next = m_string_tables;
     m_string_tables = table;
   }
 }
 ElfStringTable* ElfFile::get_string_table(int index) {
   ElfStringTable* p = m_string_tables;
   while (p != NULL) {
     if (p->index() == index) return p;
     p = p->m_next;
   }
   return NULL;
 }
 #endif // _WINDOWS

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/elfFile.cpp@3582bf76420e (annotated)

src/share/vm/utilities/elfFile.cpp