Mercurial > hg > graal-compiler
view src/share/vm/utilities/elfFile.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | 2d4762ec74af |
children | f08d439fab8c |
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/* * 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. * */ #ifndef __ELF_FILE_HPP #define __ELF_FILE_HPP #ifndef _WINDOWS #include <elf.h> #include <stdio.h> #ifdef _LP64 typedef Elf64_Half Elf_Half; typedef Elf64_Word Elf_Word; typedef Elf64_Off Elf_Off; typedef Elf64_Addr Elf_Addr; typedef Elf64_Ehdr Elf_Ehdr; typedef Elf64_Shdr Elf_Shdr; typedef Elf64_Sym Elf_Sym; #define ELF_ST_TYPE ELF64_ST_TYPE #else typedef Elf32_Half Elf_Half; typedef Elf32_Word Elf_Word; typedef Elf32_Off Elf_Off; typedef Elf32_Addr Elf_Addr; typedef Elf32_Ehdr Elf_Ehdr; typedef Elf32_Shdr Elf_Shdr; typedef Elf32_Sym Elf_Sym; #define ELF_ST_TYPE ELF32_ST_TYPE #endif #include "globalDefinitions.hpp" #include "memory/allocation.hpp" #include "utilities/decoder.hpp" class ElfStringTable; class ElfSymbolTable; // On Solaris/Linux platforms, libjvm.so does contain all private symbols. // ElfFile is basically an elf file parser, which can lookup the symbol // that is the nearest to the given address. // Beware, this code is called from vm error reporting code, when vm is already // in "error" state, so there are scenarios, lookup will fail. We want this // part of code to be very defensive, and bait out if anything went wrong. class ElfFile: public CHeapObj { friend class Decoder; public: ElfFile(const char* filepath); ~ElfFile(); const char* decode(address addr, int* offset); const char* filepath() { return m_filepath; } bool same_elf_file(const char* filepath) { assert(filepath, "null file path"); assert(m_filepath, "already out of memory"); return (m_filepath && !strcmp(filepath, m_filepath)); } Decoder::decoder_status get_status() { return m_status; } private: // sanity check, if the file is a real elf file bool is_elf_file(Elf_Ehdr&); // load string tables from the elf file bool load_tables(); // string tables are stored in a linked list void add_string_table(ElfStringTable* table); // symbol tables are stored in a linked list void add_symbol_table(ElfSymbolTable* table); // return a string table at specified section index ElfStringTable* get_string_table(int index); // look up an address and return the nearest symbol const char* look_up(Elf_Shdr shdr, address addr, int* offset); protected: ElfFile* m_next; private: // file const char* m_filepath; FILE* m_file; // Elf header Elf_Ehdr m_elfHdr; // symbol tables ElfSymbolTable* m_symbol_tables; // string tables ElfStringTable* m_string_tables; Decoder::decoder_status m_status; }; #endif // _WINDOWS #endif // __ELF_FILE_HPP