Mercurial > hg > truffle
diff src/share/vm/code/oopRecorder.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 1a5913bf5e19 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/code/oopRecorder.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,156 @@ +/* + * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_oopRecorder.cpp.incl" + +#ifdef ASSERT +int OopRecorder::_find_index_calls = 0; +int OopRecorder::_hit_indexes = 0; +int OopRecorder::_missed_indexes = 0; +#endif //ASSERT + + +OopRecorder::OopRecorder(Arena* arena) { + _handles = NULL; + _indexes = NULL; + _arena = arena; + _complete = false; +} + +OopRecorder::IndexCache::IndexCache() { + assert(first_index > 0, "initial zero state of cache must be invalid index"); + Copy::zero_to_bytes(&_cache[0], sizeof(_cache)); +} + +int OopRecorder::oop_size() { + _complete = true; + if (_handles == NULL) return 0; + return _handles->length() * sizeof(oop); +} + +void OopRecorder::copy_to(CodeBlob* code) { + assert(_complete, "must be frozen"); + maybe_initialize(); // get non-null handles, even if we have no oops + code->copy_oops(_handles); +} + +void OopRecorder::maybe_initialize() { + if (_handles == NULL) { + if (_arena != NULL) { + _handles = new(_arena) GrowableArray<jobject>(_arena, 10, 0, 0); + _no_finds = new(_arena) GrowableArray<int>( _arena, 10, 0, 0); + } else { + _handles = new GrowableArray<jobject>(10, 0, 0); + _no_finds = new GrowableArray<int>( 10, 0, 0); + } + } +} + + +jobject OopRecorder::handle_at(int index) { + // there is always a NULL virtually present as first object + if (index == null_index) return NULL; + return _handles->at(index - first_index); +} + + +// Local definition. Used only in this module. +inline bool OopRecorder::is_real_jobject(jobject h) { + return h != NULL && h != (jobject)Universe::non_oop_word(); +} + + +int OopRecorder::add_handle(jobject h, bool make_findable) { + assert(!_complete, "cannot allocate more elements after size query"); + maybe_initialize(); + // indexing uses 1 as an origin--0 means null + int index = _handles->length() + first_index; + _handles->append(h); + + // Support correct operation of find_index(). + assert(!(make_findable && !is_real_jobject(h)), "nulls are not findable"); + if (make_findable) { + // This index may be returned from find_index(). + if (_indexes != NULL) { + int* cloc = _indexes->cache_location(h); + _indexes->set_cache_location_index(cloc, index); + } else if (index == index_cache_threshold && _arena != NULL) { + _indexes = new(_arena) IndexCache(); + for (int i = 0; i < _handles->length(); i++) { + // Load the cache with pre-existing elements. + int index0 = i + first_index; + if (_no_finds->contains(index0)) continue; + int* cloc = _indexes->cache_location(_handles->at(i)); + _indexes->set_cache_location_index(cloc, index0); + } + } + } else if (is_real_jobject(h)) { + // Remember that this index is not to be returned from find_index(). + // This case is rare, because most or all uses of allocate_index pass + // a jobject argument of NULL or Universe::non_oop_word. + // Thus, the expected length of _no_finds is zero. + _no_finds->append(index); + } + + return index; +} + + +int OopRecorder::maybe_find_index(jobject h) { + debug_only(_find_index_calls++); + assert(!_complete, "cannot allocate more elements after size query"); + maybe_initialize(); + if (h == NULL) return null_index; + assert(is_real_jobject(h), "must be valid jobject"); + int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h); + if (cloc != NULL) { + int cindex = _indexes->cache_location_index(cloc); + if (cindex == 0) { + return -1; // We know this handle is completely new. + } + if (cindex >= first_index && _handles->at(cindex - first_index) == h) { + debug_only(_hit_indexes++); + return cindex; + } + if (!_indexes->cache_location_collision(cloc)) { + return -1; // We know the current cache occupant is unique to that cloc. + } + } + + // Not found in cache, due to a cache collision. (Or, no cache at all.) + // Do a linear search, most recent to oldest. + for (int i = _handles->length() - 1; i >= 0; i--) { + if (_handles->at(i) == h) { + int findex = i + first_index; + if (_no_finds->contains(findex)) continue; // oops; skip this one + if (cloc != NULL) { + _indexes->set_cache_location_index(cloc, findex); + } + debug_only(_missed_indexes++); + return findex; + } + } + return -1; +}