1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/oopRecorder.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,156 @@
1.4 +/*
1.5 + * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_oopRecorder.cpp.incl"
1.30 +
1.31 +#ifdef ASSERT
1.32 +int OopRecorder::_find_index_calls = 0;
1.33 +int OopRecorder::_hit_indexes = 0;
1.34 +int OopRecorder::_missed_indexes = 0;
1.35 +#endif //ASSERT
1.36 +
1.37 +
1.38 +OopRecorder::OopRecorder(Arena* arena) {
1.39 + _handles = NULL;
1.40 + _indexes = NULL;
1.41 + _arena = arena;
1.42 + _complete = false;
1.43 +}
1.44 +
1.45 +OopRecorder::IndexCache::IndexCache() {
1.46 + assert(first_index > 0, "initial zero state of cache must be invalid index");
1.47 + Copy::zero_to_bytes(&_cache[0], sizeof(_cache));
1.48 +}
1.49 +
1.50 +int OopRecorder::oop_size() {
1.51 + _complete = true;
1.52 + if (_handles == NULL) return 0;
1.53 + return _handles->length() * sizeof(oop);
1.54 +}
1.55 +
1.56 +void OopRecorder::copy_to(CodeBlob* code) {
1.57 + assert(_complete, "must be frozen");
1.58 + maybe_initialize(); // get non-null handles, even if we have no oops
1.59 + code->copy_oops(_handles);
1.60 +}
1.61 +
1.62 +void OopRecorder::maybe_initialize() {
1.63 + if (_handles == NULL) {
1.64 + if (_arena != NULL) {
1.65 + _handles = new(_arena) GrowableArray<jobject>(_arena, 10, 0, 0);
1.66 + _no_finds = new(_arena) GrowableArray<int>( _arena, 10, 0, 0);
1.67 + } else {
1.68 + _handles = new GrowableArray<jobject>(10, 0, 0);
1.69 + _no_finds = new GrowableArray<int>( 10, 0, 0);
1.70 + }
1.71 + }
1.72 +}
1.73 +
1.74 +
1.75 +jobject OopRecorder::handle_at(int index) {
1.76 + // there is always a NULL virtually present as first object
1.77 + if (index == null_index) return NULL;
1.78 + return _handles->at(index - first_index);
1.79 +}
1.80 +
1.81 +
1.82 +// Local definition. Used only in this module.
1.83 +inline bool OopRecorder::is_real_jobject(jobject h) {
1.84 + return h != NULL && h != (jobject)Universe::non_oop_word();
1.85 +}
1.86 +
1.87 +
1.88 +int OopRecorder::add_handle(jobject h, bool make_findable) {
1.89 + assert(!_complete, "cannot allocate more elements after size query");
1.90 + maybe_initialize();
1.91 + // indexing uses 1 as an origin--0 means null
1.92 + int index = _handles->length() + first_index;
1.93 + _handles->append(h);
1.94 +
1.95 + // Support correct operation of find_index().
1.96 + assert(!(make_findable && !is_real_jobject(h)), "nulls are not findable");
1.97 + if (make_findable) {
1.98 + // This index may be returned from find_index().
1.99 + if (_indexes != NULL) {
1.100 + int* cloc = _indexes->cache_location(h);
1.101 + _indexes->set_cache_location_index(cloc, index);
1.102 + } else if (index == index_cache_threshold && _arena != NULL) {
1.103 + _indexes = new(_arena) IndexCache();
1.104 + for (int i = 0; i < _handles->length(); i++) {
1.105 + // Load the cache with pre-existing elements.
1.106 + int index0 = i + first_index;
1.107 + if (_no_finds->contains(index0)) continue;
1.108 + int* cloc = _indexes->cache_location(_handles->at(i));
1.109 + _indexes->set_cache_location_index(cloc, index0);
1.110 + }
1.111 + }
1.112 + } else if (is_real_jobject(h)) {
1.113 + // Remember that this index is not to be returned from find_index().
1.114 + // This case is rare, because most or all uses of allocate_index pass
1.115 + // a jobject argument of NULL or Universe::non_oop_word.
1.116 + // Thus, the expected length of _no_finds is zero.
1.117 + _no_finds->append(index);
1.118 + }
1.119 +
1.120 + return index;
1.121 +}
1.122 +
1.123 +
1.124 +int OopRecorder::maybe_find_index(jobject h) {
1.125 + debug_only(_find_index_calls++);
1.126 + assert(!_complete, "cannot allocate more elements after size query");
1.127 + maybe_initialize();
1.128 + if (h == NULL) return null_index;
1.129 + assert(is_real_jobject(h), "must be valid jobject");
1.130 + int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h);
1.131 + if (cloc != NULL) {
1.132 + int cindex = _indexes->cache_location_index(cloc);
1.133 + if (cindex == 0) {
1.134 + return -1; // We know this handle is completely new.
1.135 + }
1.136 + if (cindex >= first_index && _handles->at(cindex - first_index) == h) {
1.137 + debug_only(_hit_indexes++);
1.138 + return cindex;
1.139 + }
1.140 + if (!_indexes->cache_location_collision(cloc)) {
1.141 + return -1; // We know the current cache occupant is unique to that cloc.
1.142 + }
1.143 + }
1.144 +
1.145 + // Not found in cache, due to a cache collision. (Or, no cache at all.)
1.146 + // Do a linear search, most recent to oldest.
1.147 + for (int i = _handles->length() - 1; i >= 0; i--) {
1.148 + if (_handles->at(i) == h) {
1.149 + int findex = i + first_index;
1.150 + if (_no_finds->contains(findex)) continue; // oops; skip this one
1.151 + if (cloc != NULL) {
1.152 + _indexes->set_cache_location_index(cloc, findex);
1.153 + }
1.154 + debug_only(_missed_indexes++);
1.155 + return findex;
1.156 + }
1.157 + }
1.158 + return -1;
1.159 +}
