1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/oopRecorder.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,159 @@
1.4 +/*
1.5 + * Copyright (c) 1998, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "ci/ciEnv.hpp"
1.30 +#include "ci/ciInstance.hpp"
1.31 +#include "ci/ciMetadata.hpp"
1.32 +#include "code/oopRecorder.hpp"
1.33 +#include "memory/allocation.inline.hpp"
1.34 +#include "oops/oop.inline.hpp"
1.35 +
1.36 +#ifdef ASSERT
1.37 +template <class T> int ValueRecorder<T>::_find_index_calls = 0;
1.38 +template <class T> int ValueRecorder<T>::_hit_indexes = 0;
1.39 +template <class T> int ValueRecorder<T>::_missed_indexes = 0;
1.40 +#endif //ASSERT
1.41 +
1.42 +
1.43 +template <class T> ValueRecorder<T>::ValueRecorder(Arena* arena) {
1.44 + _handles = NULL;
1.45 + _indexes = NULL;
1.46 + _arena = arena;
1.47 + _complete = false;
1.48 +}
1.49 +
1.50 +template <class T> template <class X> ValueRecorder<T>::IndexCache<X>::IndexCache() {
1.51 + assert(first_index > 0, "initial zero state of cache must be invalid index");
1.52 + Copy::zero_to_bytes(&_cache[0], sizeof(_cache));
1.53 +}
1.54 +
1.55 +template <class T> int ValueRecorder<T>::size() {
1.56 + _complete = true;
1.57 + if (_handles == NULL) return 0;
1.58 + return _handles->length() * sizeof(T);
1.59 +}
1.60 +
1.61 +template <class T> void ValueRecorder<T>::copy_values_to(nmethod* nm) {
1.62 + assert(_complete, "must be frozen");
1.63 + maybe_initialize(); // get non-null handles, even if we have no oops
1.64 + nm->copy_values(_handles);
1.65 +}
1.66 +
1.67 +template <class T> void ValueRecorder<T>::maybe_initialize() {
1.68 + if (_handles == NULL) {
1.69 + if (_arena != NULL) {
1.70 + _handles = new(_arena) GrowableArray<T>(_arena, 10, 0, 0);
1.71 + _no_finds = new(_arena) GrowableArray<int>( _arena, 10, 0, 0);
1.72 + } else {
1.73 + _handles = new GrowableArray<T>(10, 0, 0);
1.74 + _no_finds = new GrowableArray<int>( 10, 0, 0);
1.75 + }
1.76 + }
1.77 +}
1.78 +
1.79 +
1.80 +template <class T> T ValueRecorder<T>::at(int index) {
1.81 + // there is always a NULL virtually present as first object
1.82 + if (index == null_index) return NULL;
1.83 + return _handles->at(index - first_index);
1.84 +}
1.85 +
1.86 +
1.87 +template <class T> int ValueRecorder<T>::add_handle(T h, bool make_findable) {
1.88 + assert(!_complete, "cannot allocate more elements after size query");
1.89 + maybe_initialize();
1.90 + // indexing uses 1 as an origin--0 means null
1.91 + int index = _handles->length() + first_index;
1.92 + _handles->append(h);
1.93 +
1.94 + // Support correct operation of find_index().
1.95 + assert(!(make_findable && !is_real(h)), "nulls are not findable");
1.96 + if (make_findable) {
1.97 + // This index may be returned from find_index().
1.98 + if (_indexes != NULL) {
1.99 + int* cloc = _indexes->cache_location(h);
1.100 + _indexes->set_cache_location_index(cloc, index);
1.101 + } else if (index == index_cache_threshold && _arena != NULL) {
1.102 + _indexes = new(_arena) IndexCache<T>();
1.103 + for (int i = 0; i < _handles->length(); i++) {
1.104 + // Load the cache with pre-existing elements.
1.105 + int index0 = i + first_index;
1.106 + if (_no_finds->contains(index0)) continue;
1.107 + int* cloc = _indexes->cache_location(_handles->at(i));
1.108 + _indexes->set_cache_location_index(cloc, index0);
1.109 + }
1.110 + }
1.111 + } else if (is_real(h)) {
1.112 + // Remember that this index is not to be returned from find_index().
1.113 + // This case is rare, because most or all uses of allocate_index pass
1.114 + // an argument of NULL or Universe::non_oop_word.
1.115 + // Thus, the expected length of _no_finds is zero.
1.116 + _no_finds->append(index);
1.117 + }
1.118 +
1.119 + return index;
1.120 +}
1.121 +
1.122 +
1.123 +template <class T> int ValueRecorder<T>::maybe_find_index(T h) {
1.124 + debug_only(_find_index_calls++);
1.125 + assert(!_complete, "cannot allocate more elements after size query");
1.126 + maybe_initialize();
1.127 + if (h == NULL) return null_index;
1.128 + assert(is_real(h), "must be valid");
1.129 + int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h);
1.130 + if (cloc != NULL) {
1.131 + int cindex = _indexes->cache_location_index(cloc);
1.132 + if (cindex == 0) {
1.133 + return -1; // We know this handle is completely new.
1.134 + }
1.135 + if (cindex >= first_index && _handles->at(cindex - first_index) == h) {
1.136 + debug_only(_hit_indexes++);
1.137 + return cindex;
1.138 + }
1.139 + if (!_indexes->cache_location_collision(cloc)) {
1.140 + return -1; // We know the current cache occupant is unique to that cloc.
1.141 + }
1.142 + }
1.143 +
1.144 + // Not found in cache, due to a cache collision. (Or, no cache at all.)
1.145 + // Do a linear search, most recent to oldest.
1.146 + for (int i = _handles->length() - 1; i >= 0; i--) {
1.147 + if (_handles->at(i) == h) {
1.148 + int findex = i + first_index;
1.149 + if (_no_finds->contains(findex)) continue; // oops; skip this one
1.150 + if (cloc != NULL) {
1.151 + _indexes->set_cache_location_index(cloc, findex);
1.152 + }
1.153 + debug_only(_missed_indexes++);
1.154 + return findex;
1.155 + }
1.156 + }
1.157 + return -1;
1.158 +}
1.159 +
1.160 +// Explicitly instantiate these types
1.161 +template class ValueRecorder<Metadata*>;
1.162 +template class ValueRecorder<jobject>;
