hotspot/src/share/vm/code/oopRecorder.cpp
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6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
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/*
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 * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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# include "incls/_precompiled.incl"
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# include "incls/_oopRecorder.cpp.incl"
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#ifdef ASSERT
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int OopRecorder::_find_index_calls = 0;
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int OopRecorder::_hit_indexes      = 0;
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int OopRecorder::_missed_indexes   = 0;
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#endif //ASSERT
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OopRecorder::OopRecorder(Arena* arena) {
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  _handles  = NULL;
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  _indexes  = NULL;
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  _arena    = arena;
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  _complete = false;
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}
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OopRecorder::IndexCache::IndexCache() {
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  assert(first_index > 0, "initial zero state of cache must be invalid index");
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  Copy::zero_to_bytes(&_cache[0], sizeof(_cache));
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}
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int OopRecorder::oop_size() {
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  _complete = true;
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  if (_handles == NULL)  return 0;
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  return _handles->length() * sizeof(oop);
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}
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void OopRecorder::copy_to(CodeBlob* code) {
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  assert(_complete, "must be frozen");
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  maybe_initialize();  // get non-null handles, even if we have no oops
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  code->copy_oops(_handles);
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}
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void OopRecorder::maybe_initialize() {
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  if (_handles == NULL) {
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    if (_arena != NULL) {
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      _handles  = new(_arena) GrowableArray<jobject>(_arena, 10, 0, 0);
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      _no_finds = new(_arena) GrowableArray<int>(    _arena, 10, 0, 0);
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    } else {
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      _handles  = new GrowableArray<jobject>(10, 0, 0);
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      _no_finds = new GrowableArray<int>(    10, 0, 0);
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    }
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  }
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}
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jobject OopRecorder::handle_at(int index) {
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  // there is always a NULL virtually present as first object
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  if (index == null_index)  return NULL;
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  return _handles->at(index - first_index);
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}
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// Local definition.  Used only in this module.
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inline bool OopRecorder::is_real_jobject(jobject h) {
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  return h != NULL && h != (jobject)Universe::non_oop_word();
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}
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int OopRecorder::add_handle(jobject h, bool make_findable) {
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  assert(!_complete, "cannot allocate more elements after size query");
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  maybe_initialize();
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  // indexing uses 1 as an origin--0 means null
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  int index = _handles->length() + first_index;
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  _handles->append(h);
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  // Support correct operation of find_index().
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  assert(!(make_findable && !is_real_jobject(h)), "nulls are not findable");
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  if (make_findable) {
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    // This index may be returned from find_index().
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    if (_indexes != NULL) {
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      int* cloc = _indexes->cache_location(h);
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      _indexes->set_cache_location_index(cloc, index);
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    } else if (index == index_cache_threshold && _arena != NULL) {
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      _indexes = new(_arena) IndexCache();
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      for (int i = 0; i < _handles->length(); i++) {
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        // Load the cache with pre-existing elements.
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        int index0 = i + first_index;
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        if (_no_finds->contains(index0))  continue;
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        int* cloc = _indexes->cache_location(_handles->at(i));
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        _indexes->set_cache_location_index(cloc, index0);
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      }
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    }
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  } else if (is_real_jobject(h)) {
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    // Remember that this index is not to be returned from find_index().
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    // This case is rare, because most or all uses of allocate_index pass
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    // a jobject argument of NULL or Universe::non_oop_word.
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    // Thus, the expected length of _no_finds is zero.
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    _no_finds->append(index);
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  }
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  return index;
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}
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int OopRecorder::maybe_find_index(jobject h) {
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  debug_only(_find_index_calls++);
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  assert(!_complete, "cannot allocate more elements after size query");
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  maybe_initialize();
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  if (h == NULL)  return null_index;
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  assert(is_real_jobject(h), "must be valid jobject");
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  int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h);
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  if (cloc != NULL) {
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    int cindex = _indexes->cache_location_index(cloc);
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    if (cindex == 0) {
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      return -1;   // We know this handle is completely new.
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    }
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    if (cindex >= first_index && _handles->at(cindex - first_index) == h) {
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      debug_only(_hit_indexes++);
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      return cindex;
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    }
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    if (!_indexes->cache_location_collision(cloc)) {
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      return -1;   // We know the current cache occupant is unique to that cloc.
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    }
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  }
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  // Not found in cache, due to a cache collision.  (Or, no cache at all.)
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  // Do a linear search, most recent to oldest.
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  for (int i = _handles->length() - 1; i >= 0; i--) {
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    if (_handles->at(i) == h) {
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      int findex = i + first_index;
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      if (_no_finds->contains(findex))  continue;  // oops; skip this one
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      if (cloc != NULL) {
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        _indexes->set_cache_location_index(cloc, findex);
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      }
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      debug_only(_missed_indexes++);
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      return findex;
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    }
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  }
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  return -1;
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}