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src/share/vm/utilities/elfStringTable.cpp@710a3c8b516e (annotated)

src/share/vm/utilities/elfStringTable.cpp

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 6491

e7cbc95179c4

parent 0

f90c822e73f8

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26
aoqi@0	27	#if !defined(_WINDOWS) && !defined(__APPLE__)
aoqi@0	28
aoqi@0	29	#include "memory/allocation.inline.hpp"
aoqi@0	30	#include "runtime/os.hpp"
aoqi@0	31	#include "utilities/elfStringTable.hpp"
aoqi@0	32
aoqi@0	33	// We will try to load whole string table into memory if we can.
aoqi@0	34	// Otherwise, fallback to more expensive file operation.
aoqi@0	35	ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
aoqi@0	36	assert(file, "null file handle");
aoqi@0	37	m_table = NULL;
aoqi@0	38	m_index = index;
aoqi@0	39	m_next = NULL;
aoqi@0	40	m_file = file;
aoqi@0	41	m_status = NullDecoder::no_error;
aoqi@0	42
aoqi@0	43	// try to load the string table
aoqi@0	44	long cur_offset = ftell(file);
aoqi@0	45	m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size, mtInternal);
aoqi@0	46	if (m_table != NULL) {
aoqi@0	47	// if there is an error, mark the error
aoqi@0	48	if (fseek(file, shdr.sh_offset, SEEK_SET) ||
aoqi@0	49	fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||
aoqi@0	50	fseek(file, cur_offset, SEEK_SET)) {
aoqi@0	51	m_status = NullDecoder::file_invalid;
aoqi@0	52	os::free((void*)m_table);
aoqi@0	53	m_table = NULL;
aoqi@0	54	}
aoqi@0	55	} else {
aoqi@0	56	memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
aoqi@0	57	}
aoqi@0	58	}
aoqi@0	59
aoqi@0	60	ElfStringTable::~ElfStringTable() {
aoqi@0	61	if (m_table != NULL) {
aoqi@0	62	os::free((void*)m_table);
aoqi@0	63	}
aoqi@0	64
aoqi@0	65	if (m_next != NULL) {
aoqi@0	66	delete m_next;
aoqi@0	67	}
aoqi@0	68	}
aoqi@0	69
aoqi@0	70	bool ElfStringTable::string_at(int pos, char* buf, int buflen) {
aoqi@0	71	if (NullDecoder::is_error(m_status)) {
aoqi@0	72	return false;
aoqi@0	73	}
aoqi@0	74	if (m_table != NULL) {
aoqi@0	75	jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos));
aoqi@0	76	return true;
aoqi@0	77	} else {
aoqi@0	78	long cur_pos = ftell(m_file);
aoqi@0	79	if (cur_pos == -1 ||
aoqi@0	80	fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||
aoqi@0	81	fread(buf, 1, buflen, m_file) <= 0 ||
aoqi@0	82	fseek(m_file, cur_pos, SEEK_SET)) {
aoqi@0	83	m_status = NullDecoder::file_invalid;
aoqi@0	84	return false;
aoqi@0	85	}
aoqi@0	86	return true;
aoqi@0	87	}
aoqi@0	88	}
aoqi@0	89
aoqi@0	90	#endif // !_WINDOWS && !__APPLE__