truffle: src/share/vm/utilities/elfStringTable.cpp annotate

annotate src/share/vm/utilities/elfStringTable.cpp @ 20543:e7d0505c8a30

8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso

author	tschatzl
date	Fri, 10 Oct 2014 15:51:58 +0200
parents	e7cbc95179c4
children	4ca6dc0799b6

rev	line source
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	1 /*
14441 e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables simonis parents: 6842 diff changeset	2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	4 *
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	7 * published by the Free Software Foundation.
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	8 *
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	13 * accompanied this code).
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	14 *
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	18 *
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	20 * or visit www.oracle.com if you need additional information or have any
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	21 * questions.
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	22 *
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	23 */
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	24
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	25 #include "precompiled.hpp"
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	26
3960 f08d439fab8c 7089790: integrate bsd-port changes never parents: 3302 diff changeset	27 #if !defined(_WINDOWS) && !defined(__APPLE__)
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	28
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	29 #include "memory/allocation.inline.hpp"
3302 2a3da7eaf4a6 7036747: 7017009 reappeared, problem with ElfStringTable zgu parents: 2022 diff changeset	30 #include "runtime/os.hpp"
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	31 #include "utilities/elfStringTable.hpp"
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	32
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	33 // We will try to load whole string table into memory if we can.
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	34 // Otherwise, fallback to more expensive file operation.
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	35 ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	36 assert(file, "null file handle");
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	37 m_table = NULL;
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	38 m_index = index;
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	39 m_next = NULL;
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	40 m_file = file;
4803 d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	41 m_status = NullDecoder::no_error;
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	42
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	43 // try to load the string table
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	44 long cur_offset = ftell(file);
6197 d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1) zgu parents: 4803 diff changeset	45 m_table = (char)os::malloc(sizeof(char) shdr.sh_size, mtInternal);
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	46 if (m_table != NULL) {
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	47 // if there is an error, mark the error
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	48 if (fseek(file, shdr.sh_offset, SEEK_SET) \|\|
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	49 fread((void*)m_table, shdr.sh_size, 1, file) != 1 \|\|
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	50 fseek(file, cur_offset, SEEK_SET)) {
4803 d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	51 m_status = NullDecoder::file_invalid;
3302 2a3da7eaf4a6 7036747: 7017009 reappeared, problem with ElfStringTable zgu parents: 2022 diff changeset	52 os::free((void*)m_table);
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	53 m_table = NULL;
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	54 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	55 } else {
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	56 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	57 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	58 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	59
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	60 ElfStringTable::~ElfStringTable() {
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	61 if (m_table != NULL) {
3302 2a3da7eaf4a6 7036747: 7017009 reappeared, problem with ElfStringTable zgu parents: 2022 diff changeset	62 os::free((void*)m_table);
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	63 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	64
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	65 if (m_next != NULL) {
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	66 delete m_next;
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	67 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	68 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	69
4803 d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	70 bool ElfStringTable::string_at(int pos, char* buf, int buflen) {
d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	71 if (NullDecoder::is_error(m_status)) {
d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	72 return false;
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	73 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	74 if (m_table != NULL) {
4803 d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	75 jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos));
d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	76 return true;
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	77 } else {
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	78 long cur_pos = ftell(m_file);
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	79 if (cur_pos == -1 \|\|
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	80 fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) \|\|
4803 d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	81 fread(buf, 1, buflen, m_file) <= 0 \|\|
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	82 fseek(m_file, cur_pos, SEEK_SET)) {
4803 d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	83 m_status = NullDecoder::file_invalid;
d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	84 return false;
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	85 }
4803 d7e3846464d0 7071311: Decoder enhancement zgu parents: 3960 diff changeset	86 return true;
2022 2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	87 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	88 }
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project) zgu parents: diff changeset	89
14441 e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables simonis parents: 6842 diff changeset	90 #endif // !_WINDOWS && !__APPLE__

Mercurial > hg > truffle

annotate src/share/vm/utilities/elfStringTable.cpp @ 20543:e7d0505c8a30