Mercurial > hg > truffle
view src/share/vm/utilities/elfSymbolTable.cpp @ 7196:2aff40cb4703
7092905: C2: Keep track of the number of dead nodes
Summary: keep an (almost) accurate running count of the reachable (live) flow graph nodes.
Reviewed-by: kvn, twisti, jrose, vlivanov
author | bharadwaj |
---|---|
date | Tue, 27 Nov 2012 17:24:15 -0800 |
parents | b9a9ed0f8eeb |
children | e7cbc95179c4 |
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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 "memory/allocation.inline.hpp" #include "utilities/elfSymbolTable.hpp" ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) { assert(file, "null file handle"); m_symbols = NULL; m_next = NULL; m_file = file; m_status = NullDecoder::no_error; // try to load the string table long cur_offset = ftell(file); if (cur_offset != -1) { // call malloc so we can back up if memory allocation fails. m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal); if (m_symbols) { if (fseek(file, shdr.sh_offset, SEEK_SET) || fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 || fseek(file, cur_offset, SEEK_SET)) { m_status = NullDecoder::file_invalid; os::free(m_symbols); m_symbols = NULL; } } if (!NullDecoder::is_error(m_status)) { memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr)); } } else { m_status = NullDecoder::file_invalid; } } ElfSymbolTable::~ElfSymbolTable() { if (m_symbols != NULL) { os::free(m_symbols); } if (m_next != NULL) { delete m_next; } } bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) { assert(stringtableIndex, "null string table index pointer"); assert(posIndex, "null string table offset pointer"); assert(offset, "null offset pointer"); if (NullDecoder::is_error(m_status)) { return false; } address pc = 0; size_t sym_size = sizeof(Elf_Sym); assert((m_shdr.sh_size % sym_size) == 0, "check size"); int count = m_shdr.sh_size / sym_size; if (m_symbols != NULL) { for (int index = 0; index < count; index ++) { if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) { address sym_addr = (address)m_symbols[index].st_value; if (sym_addr < addr && (addr - sym_addr) < *offset) { pc = (address)m_symbols[index].st_value; *offset = (int)(addr - pc); *posIndex = m_symbols[index].st_name; *stringtableIndex = m_shdr.sh_link; } } } } else { long cur_pos; if ((cur_pos = ftell(m_file)) == -1 || fseek(m_file, m_shdr.sh_offset, SEEK_SET)) { m_status = NullDecoder::file_invalid; return false; } Elf_Sym sym; for (int index = 0; index < count; index ++) { if (fread(&sym, sym_size, 1, m_file) == 1) { if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) { address sym_addr = (address)sym.st_value; if (sym_addr < addr && (addr - sym_addr) < *offset) { pc = (address)sym.st_value; *offset = (int)(addr - pc); *posIndex = sym.st_name; *stringtableIndex = m_shdr.sh_link; } } } else { m_status = NullDecoder::file_invalid; return false; } } fseek(m_file, cur_pos, SEEK_SET); } return true; } #endif // _WINDOWS