Mercurial > hg > truffle
view src/share/vm/utilities/elfFile.cpp @ 8733:9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate().
Reviewed-by: johnc, ysr
Contributed-by: tamao <tao.mao@oracle.com>
author | tamao |
---|---|
date | Tue, 05 Mar 2013 15:36:56 -0800 |
parents | b9a9ed0f8eeb |
children | 9058789475af |
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/* * Copyright (c) 1997, 2012, 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" #if !defined(_WINDOWS) && !defined(__APPLE__) #include <string.h> #include <stdio.h> #include <limits.h> #include <new> #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 = NullDecoder::no_error; int len = strlen(filepath) + 1; m_filepath = (const char*)os::malloc(len * sizeof(char), mtInternal); if (m_filepath != NULL) { strcpy((char*)m_filepath, filepath); m_file = fopen(filepath, "r"); if (m_file != NULL) { load_tables(); } else { m_status = NullDecoder::file_not_found; } } else { m_status = NullDecoder::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) { os::free((void*)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(!NullDecoder::is_error(m_status), "already in error"); // read elf file header if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) { m_status = NullDecoder::file_invalid; return false; } if (!is_elf_file(m_elfHdr)) { m_status = NullDecoder::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 (NullDecoder::is_error(m_status)) 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 = NullDecoder::file_invalid; return false; } // string table if (shdr.sh_type == SHT_STRTAB) { ElfStringTable* table = new (std::nothrow) ElfStringTable(m_file, shdr, index); if (table == NULL) { m_status = NullDecoder::out_of_memory; return false; } add_string_table(table); } else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) { ElfSymbolTable* table = new (std::nothrow) ElfSymbolTable(m_file, shdr); if (table == NULL) { m_status = NullDecoder::out_of_memory; return false; } add_symbol_table(table); } } } return true; } bool ElfFile::decode(address addr, char* buf, int buflen, int* offset) { // something already went wrong, just give up if (NullDecoder::is_error(m_status)) { return false; } 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 (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 false; ElfStringTable* string_table = get_string_table(string_table_index); if (string_table == NULL) { m_status = NullDecoder::file_invalid; return false; } if (offset) *offset = off; return string_table->string_at(pos_in_string_table, buf, buflen); } 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