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src/share/vm/utilities/elfSymbolTable.cpp@2d8a650513c2 (annotated)

src/share/vm/utilities/elfSymbolTable.cpp

Fri, 29 Apr 2016 00:06:10 +0800

author

aoqi

date

Fri, 29 Apr 2016 00:06:10 +0800

changeset 1

2d8a650513c2

parent 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Added MIPS 64-bit port.

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 "utilities/elfFuncDescTable.hpp"
aoqi@0	31	#include "utilities/elfSymbolTable.hpp"
aoqi@0	32
aoqi@0	33	ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
aoqi@0	34	assert(file, "null file handle");
aoqi@0	35	m_symbols = NULL;
aoqi@0	36	m_next = NULL;
aoqi@0	37	m_file = file;
aoqi@0	38	m_status = NullDecoder::no_error;
aoqi@0	39
aoqi@0	40	// try to load the string table
aoqi@0	41	long cur_offset = ftell(file);
aoqi@0	42	if (cur_offset != -1) {
aoqi@0	43	// call malloc so we can back up if memory allocation fails.
aoqi@0	44	m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal);
aoqi@0	45	if (m_symbols) {
aoqi@0	46	if (fseek(file, shdr.sh_offset, SEEK_SET) ||
aoqi@0	47	fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
aoqi@0	48	fseek(file, cur_offset, SEEK_SET)) {
aoqi@0	49	m_status = NullDecoder::file_invalid;
aoqi@0	50	os::free(m_symbols);
aoqi@0	51	m_symbols = NULL;
aoqi@0	52	}
aoqi@0	53	}
aoqi@0	54	if (!NullDecoder::is_error(m_status)) {
aoqi@0	55	memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
aoqi@0	56	}
aoqi@0	57	} else {
aoqi@0	58	m_status = NullDecoder::file_invalid;
aoqi@0	59	}
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	ElfSymbolTable::~ElfSymbolTable() {
aoqi@0	63	if (m_symbols != NULL) {
aoqi@0	64	os::free(m_symbols);
aoqi@0	65	}
aoqi@0	66
aoqi@0	67	if (m_next != NULL) {
aoqi@0	68	delete m_next;
aoqi@0	69	}
aoqi@0	70	}
aoqi@0	71
aoqi@0	72	bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) {
aoqi@0	73	assert(stringtableIndex, "null string table index pointer");
aoqi@0	74	assert(posIndex, "null string table offset pointer");
aoqi@0	75	assert(offset, "null offset pointer");
aoqi@0	76
aoqi@0	77	if (NullDecoder::is_error(m_status)) {
aoqi@0	78	return false;
aoqi@0	79	}
aoqi@0	80
aoqi@0	81	size_t sym_size = sizeof(Elf_Sym);
aoqi@0	82	assert((m_shdr.sh_size % sym_size) == 0, "check size");
aoqi@0	83	int count = m_shdr.sh_size / sym_size;
aoqi@0	84	if (m_symbols != NULL) {
aoqi@0	85	for (int index = 0; index < count; index ++) {
aoqi@0	86	if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
aoqi@0	87	Elf_Word st_size = m_symbols[index].st_size;
aoqi@0	88	address sym_addr;
aoqi@0	89	if (funcDescTable != NULL && funcDescTable->get_index() == m_symbols[index].st_shndx) {
aoqi@0	90	// We need to go another step trough the function descriptor table (currently PPC64 only)
aoqi@0	91	sym_addr = funcDescTable->lookup(m_symbols[index].st_value);
aoqi@0	92	} else {
aoqi@0	93	sym_addr = (address)m_symbols[index].st_value;
aoqi@0	94	}
aoqi@0	95	if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
aoqi@0	96	*offset = (int)(addr - sym_addr);
aoqi@0	97	*posIndex = m_symbols[index].st_name;
aoqi@0	98	*stringtableIndex = m_shdr.sh_link;
aoqi@0	99	return true;
aoqi@0	100	}
aoqi@0	101	}
aoqi@0	102	}
aoqi@0	103	} else {
aoqi@0	104	long cur_pos;
aoqi@0	105	if ((cur_pos = ftell(m_file)) == -1 ||
aoqi@0	106	fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
aoqi@0	107	m_status = NullDecoder::file_invalid;
aoqi@0	108	return false;
aoqi@0	109	}
aoqi@0	110
aoqi@0	111	Elf_Sym sym;
aoqi@0	112	for (int index = 0; index < count; index ++) {
aoqi@0	113	if (fread(&sym, sym_size, 1, m_file) == 1) {
aoqi@0	114	if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
aoqi@0	115	Elf_Word st_size = sym.st_size;
aoqi@0	116	address sym_addr;
aoqi@0	117	if (funcDescTable != NULL && funcDescTable->get_index() == sym.st_shndx) {
aoqi@0	118	// We need to go another step trough the function descriptor table (currently PPC64 only)
aoqi@0	119	sym_addr = funcDescTable->lookup(sym.st_value);
aoqi@0	120	} else {
aoqi@0	121	sym_addr = (address)sym.st_value;
aoqi@0	122	}
aoqi@0	123	if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
aoqi@0	124	*offset = (int)(addr - sym_addr);
aoqi@0	125	*posIndex = sym.st_name;
aoqi@0	126	*stringtableIndex = m_shdr.sh_link;
aoqi@0	127	return true;
aoqi@0	128	}
aoqi@0	129	}
aoqi@0	130	} else {
aoqi@0	131	m_status = NullDecoder::file_invalid;
aoqi@0	132	return false;
aoqi@0	133	}
aoqi@0	134	}
aoqi@0	135	fseek(m_file, cur_pos, SEEK_SET);
aoqi@0	136	}
aoqi@0	137	return true;
aoqi@0	138	}
aoqi@0	139
aoqi@0	140	#endif // !_WINDOWS && !__APPLE__