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/*
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* Copyright 2001-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_binaryTreeDictionary.cpp.incl"
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////////////////////////////////////////////////////////////////////////////////
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// A binary tree based search structure for free blocks.
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// This is currently used in the Concurrent Mark&Sweep implementation.
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////////////////////////////////////////////////////////////////////////////////
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TreeChunk* TreeChunk::as_TreeChunk(FreeChunk* fc) {
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// Do some assertion checking here.
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return (TreeChunk*) fc;
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}
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void TreeChunk::verifyTreeChunkList() const {
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TreeChunk* nextTC = (TreeChunk*)next();
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if (prev() != NULL) { // interior list node shouldn'r have tree fields
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guarantee(embedded_list()->parent() == NULL && embedded_list()->left() == NULL &&
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embedded_list()->right() == NULL, "should be clear");
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}
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if (nextTC != NULL) {
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guarantee(as_TreeChunk(nextTC->prev()) == this, "broken chain");
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guarantee(nextTC->size() == size(), "wrong size");
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nextTC->verifyTreeChunkList();
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}
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}
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TreeList* TreeList::as_TreeList(TreeChunk* tc) {
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// This first free chunk in the list will be the tree list.
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assert(tc->size() >= sizeof(TreeChunk), "Chunk is too small for a TreeChunk");
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TreeList* tl = tc->embedded_list();
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tc->set_list(tl);
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#ifdef ASSERT
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tl->set_protecting_lock(NULL);
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#endif
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tl->set_hint(0);
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tl->set_size(tc->size());
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tl->link_head(tc);
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tl->link_tail(tc);
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tl->set_count(1);
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tl->init_statistics();
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tl->setParent(NULL);
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tl->setLeft(NULL);
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tl->setRight(NULL);
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return tl;
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}
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TreeList* TreeList::as_TreeList(HeapWord* addr, size_t size) {
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TreeChunk* tc = (TreeChunk*) addr;
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assert(size >= sizeof(TreeChunk), "Chunk is too small for a TreeChunk");
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assert(tc->size() == 0 && tc->prev() == NULL && tc->next() == NULL,
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"Space should be clear");
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tc->setSize(size);
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tc->linkPrev(NULL);
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tc->linkNext(NULL);
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TreeList* tl = TreeList::as_TreeList(tc);
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return tl;
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}
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TreeList* TreeList::removeChunkReplaceIfNeeded(TreeChunk* tc) {
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TreeList* retTL = this;
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FreeChunk* list = head();
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assert(!list || list != list->next(), "Chunk on list twice");
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assert(tc != NULL, "Chunk being removed is NULL");
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assert(parent() == NULL || this == parent()->left() ||
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this == parent()->right(), "list is inconsistent");
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assert(tc->isFree(), "Header is not marked correctly");
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assert(head() == NULL || head()->prev() == NULL, "list invariant");
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assert(tail() == NULL || tail()->next() == NULL, "list invariant");
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FreeChunk* prevFC = tc->prev();
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TreeChunk* nextTC = TreeChunk::as_TreeChunk(tc->next());
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assert(list != NULL, "should have at least the target chunk");
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// Is this the first item on the list?
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if (tc == list) {
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// The "getChunk..." functions for a TreeList will not return the
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// first chunk in the list unless it is the last chunk in the list
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// because the first chunk is also acting as the tree node.
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// When coalescing happens, however, the first chunk in the a tree
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// list can be the start of a free range. Free ranges are removed
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// from the free lists so that they are not available to be
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// allocated when the sweeper yields (giving up the free list lock)
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// to allow mutator activity. If this chunk is the first in the
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// list and is not the last in the list, do the work to copy the
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// TreeList from the first chunk to the next chunk and update all
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// the TreeList pointers in the chunks in the list.
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if (nextTC == NULL) {
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assert(prevFC == NULL, "Not last chunk in the list")
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set_tail(NULL);
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set_head(NULL);
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} else {
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// copy embedded list.
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nextTC->set_embedded_list(tc->embedded_list());
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retTL = nextTC->embedded_list();
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// Fix the pointer to the list in each chunk in the list.
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// This can be slow for a long list. Consider having
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// an option that does not allow the first chunk on the
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// list to be coalesced.
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for (TreeChunk* curTC = nextTC; curTC != NULL;
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curTC = TreeChunk::as_TreeChunk(curTC->next())) {
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curTC->set_list(retTL);
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}
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// Fix the parent to point to the new TreeList.
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if (retTL->parent() != NULL) {
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if (this == retTL->parent()->left()) {
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retTL->parent()->setLeft(retTL);
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} else {
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assert(this == retTL->parent()->right(), "Parent is incorrect");
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retTL->parent()->setRight(retTL);
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}
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}
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// Fix the children's parent pointers to point to the
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// new list.
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assert(right() == retTL->right(), "Should have been copied");
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if (retTL->right() != NULL) {
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retTL->right()->setParent(retTL);
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}
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assert(left() == retTL->left(), "Should have been copied");
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if (retTL->left() != NULL) {
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retTL->left()->setParent(retTL);
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}
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retTL->link_head(nextTC);
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assert(nextTC->isFree(), "Should be a free chunk");
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}
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} else {
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if (nextTC == NULL) {
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// Removing chunk at tail of list
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link_tail(prevFC);
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}
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// Chunk is interior to the list
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prevFC->linkAfter(nextTC);
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}
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// Below this point the embeded TreeList being used for the
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// tree node may have changed. Don't use "this"
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// TreeList*.
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// chunk should still be a free chunk (bit set in _prev)
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assert(!retTL->head() || retTL->size() == retTL->head()->size(),
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"Wrong sized chunk in list");
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debug_only(
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tc->linkPrev(NULL);
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tc->linkNext(NULL);
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tc->set_list(NULL);
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bool prev_found = false;
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bool next_found = false;
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for (FreeChunk* curFC = retTL->head();
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curFC != NULL; curFC = curFC->next()) {
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assert(curFC != tc, "Chunk is still in list");
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if (curFC == prevFC) {
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prev_found = true;
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}
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if (curFC == nextTC) {
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next_found = true;
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}
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}
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assert(prevFC == NULL || prev_found, "Chunk was lost from list");
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assert(nextTC == NULL || next_found, "Chunk was lost from list");
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assert(retTL->parent() == NULL ||
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retTL == retTL->parent()->left() ||
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retTL == retTL->parent()->right(),
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"list is inconsistent");
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)
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retTL->decrement_count();
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assert(tc->isFree(), "Should still be a free chunk");
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assert(retTL->head() == NULL || retTL->head()->prev() == NULL,
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"list invariant");
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assert(retTL->tail() == NULL || retTL->tail()->next() == NULL,
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"list invariant");
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return retTL;
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}
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void TreeList::returnChunkAtTail(TreeChunk* chunk) {
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assert(chunk != NULL, "returning NULL chunk");
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assert(chunk->list() == this, "list should be set for chunk");
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assert(tail() != NULL, "The tree list is embedded in the first chunk");
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// which means that the list can never be empty.
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assert(!verifyChunkInFreeLists(chunk), "Double entry");
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assert(head() == NULL || head()->prev() == NULL, "list invariant");
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assert(tail() == NULL || tail()->next() == NULL, "list invariant");
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FreeChunk* fc = tail();
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fc->linkAfter(chunk);
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link_tail(chunk);
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assert(!tail() || size() == tail()->size(), "Wrong sized chunk in list");
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increment_count();
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debug_only(increment_returnedBytes_by(chunk->size()*sizeof(HeapWord));)
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assert(head() == NULL || head()->prev() == NULL, "list invariant");
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assert(tail() == NULL || tail()->next() == NULL, "list invariant");
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}
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// Add this chunk at the head of the list. "At the head of the list"
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// is defined to be after the chunk pointer to by head(). This is
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// because the TreeList is embedded in the first TreeChunk in the
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// list. See the definition of TreeChunk.
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void TreeList::returnChunkAtHead(TreeChunk* chunk) {
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assert(chunk->list() == this, "list should be set for chunk");
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assert(head() != NULL, "The tree list is embedded in the first chunk");
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assert(chunk != NULL, "returning NULL chunk");
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assert(!verifyChunkInFreeLists(chunk), "Double entry");
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assert(head() == NULL || head()->prev() == NULL, "list invariant");
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assert(tail() == NULL || tail()->next() == NULL, "list invariant");
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FreeChunk* fc = head()->next();
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if (fc != NULL) {
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chunk->linkAfter(fc);
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} else {
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assert(tail() == NULL, "List is inconsistent");
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link_tail(chunk);
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}
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head()->linkAfter(chunk);
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assert(!head() || size() == head()->size(), "Wrong sized chunk in list");
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increment_count();
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debug_only(increment_returnedBytes_by(chunk->size()*sizeof(HeapWord));)
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assert(head() == NULL || head()->prev() == NULL, "list invariant");
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assert(tail() == NULL || tail()->next() == NULL, "list invariant");
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}
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TreeChunk* TreeList::head_as_TreeChunk() {
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assert(head() == NULL || TreeChunk::as_TreeChunk(head())->list() == this,
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"Wrong type of chunk?");
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return TreeChunk::as_TreeChunk(head());
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}
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TreeChunk* TreeList::first_available() {
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guarantee(head() != NULL, "The head of the list cannot be NULL");
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FreeChunk* fc = head()->next();
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TreeChunk* retTC;
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if (fc == NULL) {
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retTC = head_as_TreeChunk();
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} else {
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retTC = TreeChunk::as_TreeChunk(fc);
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}
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assert(retTC->list() == this, "Wrong type of chunk.");
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return retTC;
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}
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BinaryTreeDictionary::BinaryTreeDictionary(MemRegion mr, bool splay):
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_splay(splay)
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{
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assert(mr.byte_size() > MIN_TREE_CHUNK_SIZE, "minimum chunk size");
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reset(mr);
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assert(root()->left() == NULL, "reset check failed");
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assert(root()->right() == NULL, "reset check failed");
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assert(root()->head()->next() == NULL, "reset check failed");
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assert(root()->head()->prev() == NULL, "reset check failed");
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assert(totalSize() == root()->size(), "reset check failed");
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assert(totalFreeBlocks() == 1, "reset check failed");
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}
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void BinaryTreeDictionary::inc_totalSize(size_t inc) {
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_totalSize = _totalSize + inc;
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}
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void BinaryTreeDictionary::dec_totalSize(size_t dec) {
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_totalSize = _totalSize - dec;
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}
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void BinaryTreeDictionary::reset(MemRegion mr) {
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assert(mr.byte_size() > MIN_TREE_CHUNK_SIZE, "minimum chunk size");
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set_root(TreeList::as_TreeList(mr.start(), mr.word_size()));
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set_totalSize(mr.word_size());
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set_totalFreeBlocks(1);
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}
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void BinaryTreeDictionary::reset(HeapWord* addr, size_t byte_size) {
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MemRegion mr(addr, heap_word_size(byte_size));
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reset(mr);
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}
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void BinaryTreeDictionary::reset() {
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set_root(NULL);
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set_totalSize(0);
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set_totalFreeBlocks(0);
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}
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// Get a free block of size at least size from tree, or NULL.
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// If a splay step is requested, the removal algorithm (only) incorporates
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// a splay step as follows:
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// . the search proceeds down the tree looking for a possible
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// match. At the (closest) matching location, an appropriate splay step is applied
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// (zig, zig-zig or zig-zag). A chunk of the appropriate size is then returned
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// if available, and if it's the last chunk, the node is deleted. A deteleted
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// node is replaced in place by its tree successor.
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TreeChunk*
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BinaryTreeDictionary::getChunkFromTree(size_t size, Dither dither, bool splay)
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{
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TreeList *curTL, *prevTL;
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TreeChunk* retTC = NULL;
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assert(size >= MIN_TREE_CHUNK_SIZE, "minimum chunk size");
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if (FLSVerifyDictionary) {
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verifyTree();
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}
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// starting at the root, work downwards trying to find match.
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// Remember the last node of size too great or too small.
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for (prevTL = curTL = root(); curTL != NULL;) {
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if (curTL->size() == size) { // exact match
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break;
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}
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prevTL = curTL;
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if (curTL->size() < size) { // proceed to right sub-tree
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curTL = curTL->right();
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} else { // proceed to left sub-tree
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assert(curTL->size() > size, "size inconsistency");
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curTL = curTL->left();
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}
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}
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if (curTL == NULL) { // couldn't find exact match
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// try and find the next larger size by walking back up the search path
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for (curTL = prevTL; curTL != NULL;) {
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if (curTL->size() >= size) break;
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else curTL = curTL->parent();
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}
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assert(curTL == NULL || curTL->count() > 0,
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"An empty list should not be in the tree");
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}
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if (curTL != NULL) {
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assert(curTL->size() >= size, "size inconsistency");
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if (UseCMSAdaptiveFreeLists) {
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// A candidate chunk has been found. If it is already under
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// populated, get a chunk associated with the hint for this
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// chunk.
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if (curTL->surplus() <= 0) {
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/* Use the hint to find a size with a surplus, and reset the hint. */
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TreeList* hintTL = curTL;
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while (hintTL->hint() != 0) {
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assert(hintTL->hint() == 0 || hintTL->hint() > hintTL->size(),
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"hint points in the wrong direction");
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hintTL = findList(hintTL->hint());
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assert(curTL != hintTL, "Infinite loop");
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if (hintTL == NULL ||
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hintTL == curTL /* Should not happen but protect against it */ ) {
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// No useful hint. Set the hint to NULL and go on.
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curTL->set_hint(0);
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break;
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}
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assert(hintTL->size() > size, "hint is inconsistent");
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if (hintTL->surplus() > 0) {
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// The hint led to a list that has a surplus. Use it.
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// Set the hint for the candidate to an overpopulated
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// size.
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curTL->set_hint(hintTL->size());
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// Change the candidate.
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curTL = hintTL;
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break;
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}
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// The evm code reset the hint of the candidate as
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// at an interrim point. Why? Seems like this leaves
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// the hint pointing to a list that didn't work.
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// curTL->set_hint(hintTL->size());
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}
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}
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}
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|
381 |
// don't waste time splaying if chunk's singleton
|
|
382 |
if (splay && curTL->head()->next() != NULL) {
|
|
383 |
semiSplayStep(curTL);
|
|
384 |
}
|
|
385 |
retTC = curTL->first_available();
|
|
386 |
assert((retTC != NULL) && (curTL->count() > 0),
|
|
387 |
"A list in the binary tree should not be NULL");
|
|
388 |
assert(retTC->size() >= size,
|
|
389 |
"A chunk of the wrong size was found");
|
|
390 |
removeChunkFromTree(retTC);
|
|
391 |
assert(retTC->isFree(), "Header is not marked correctly");
|
|
392 |
}
|
|
393 |
|
|
394 |
if (FLSVerifyDictionary) {
|
|
395 |
verify();
|
|
396 |
}
|
|
397 |
return retTC;
|
|
398 |
}
|
|
399 |
|
|
400 |
TreeList* BinaryTreeDictionary::findList(size_t size) const {
|
|
401 |
TreeList* curTL;
|
|
402 |
for (curTL = root(); curTL != NULL;) {
|
|
403 |
if (curTL->size() == size) { // exact match
|
|
404 |
break;
|
|
405 |
}
|
|
406 |
|
|
407 |
if (curTL->size() < size) { // proceed to right sub-tree
|
|
408 |
curTL = curTL->right();
|
|
409 |
} else { // proceed to left sub-tree
|
|
410 |
assert(curTL->size() > size, "size inconsistency");
|
|
411 |
curTL = curTL->left();
|
|
412 |
}
|
|
413 |
}
|
|
414 |
return curTL;
|
|
415 |
}
|
|
416 |
|
|
417 |
|
|
418 |
bool BinaryTreeDictionary::verifyChunkInFreeLists(FreeChunk* tc) const {
|
|
419 |
size_t size = tc->size();
|
|
420 |
TreeList* tl = findList(size);
|
|
421 |
if (tl == NULL) {
|
|
422 |
return false;
|
|
423 |
} else {
|
|
424 |
return tl->verifyChunkInFreeLists(tc);
|
|
425 |
}
|
|
426 |
}
|
|
427 |
|
|
428 |
FreeChunk* BinaryTreeDictionary::findLargestDict() const {
|
|
429 |
TreeList *curTL = root();
|
|
430 |
if (curTL != NULL) {
|
|
431 |
while(curTL->right() != NULL) curTL = curTL->right();
|
|
432 |
return curTL->first_available();
|
|
433 |
} else {
|
|
434 |
return NULL;
|
|
435 |
}
|
|
436 |
}
|
|
437 |
|
|
438 |
// Remove the current chunk from the tree. If it is not the last
|
|
439 |
// chunk in a list on a tree node, just unlink it.
|
|
440 |
// If it is the last chunk in the list (the next link is NULL),
|
|
441 |
// remove the node and repair the tree.
|
|
442 |
TreeChunk*
|
|
443 |
BinaryTreeDictionary::removeChunkFromTree(TreeChunk* tc) {
|
|
444 |
assert(tc != NULL, "Should not call with a NULL chunk");
|
|
445 |
assert(tc->isFree(), "Header is not marked correctly");
|
|
446 |
|
|
447 |
TreeList *newTL, *parentTL;
|
|
448 |
TreeChunk* retTC;
|
|
449 |
TreeList* tl = tc->list();
|
|
450 |
debug_only(
|
|
451 |
bool removing_only_chunk = false;
|
|
452 |
if (tl == _root) {
|
|
453 |
if ((_root->left() == NULL) && (_root->right() == NULL)) {
|
|
454 |
if (_root->count() == 1) {
|
|
455 |
assert(_root->head() == tc, "Should only be this one chunk");
|
|
456 |
removing_only_chunk = true;
|
|
457 |
}
|
|
458 |
}
|
|
459 |
}
|
|
460 |
)
|
|
461 |
assert(tl != NULL, "List should be set");
|
|
462 |
assert(tl->parent() == NULL || tl == tl->parent()->left() ||
|
|
463 |
tl == tl->parent()->right(), "list is inconsistent");
|
|
464 |
|
|
465 |
bool complicatedSplice = false;
|
|
466 |
|
|
467 |
retTC = tc;
|
|
468 |
// Removing this chunk can have the side effect of changing the node
|
|
469 |
// (TreeList*) in the tree. If the node is the root, update it.
|
|
470 |
TreeList* replacementTL = tl->removeChunkReplaceIfNeeded(tc);
|
|
471 |
assert(tc->isFree(), "Chunk should still be free");
|
|
472 |
assert(replacementTL->parent() == NULL ||
|
|
473 |
replacementTL == replacementTL->parent()->left() ||
|
|
474 |
replacementTL == replacementTL->parent()->right(),
|
|
475 |
"list is inconsistent");
|
|
476 |
if (tl == root()) {
|
|
477 |
assert(replacementTL->parent() == NULL, "Incorrectly replacing root");
|
|
478 |
set_root(replacementTL);
|
|
479 |
}
|
|
480 |
debug_only(
|
|
481 |
if (tl != replacementTL) {
|
|
482 |
assert(replacementTL->head() != NULL,
|
|
483 |
"If the tree list was replaced, it should not be a NULL list");
|
|
484 |
TreeList* rhl = replacementTL->head_as_TreeChunk()->list();
|
|
485 |
TreeList* rtl = TreeChunk::as_TreeChunk(replacementTL->tail())->list();
|
|
486 |
assert(rhl == replacementTL, "Broken head");
|
|
487 |
assert(rtl == replacementTL, "Broken tail");
|
|
488 |
assert(replacementTL->size() == tc->size(), "Broken size");
|
|
489 |
}
|
|
490 |
)
|
|
491 |
|
|
492 |
// Does the tree need to be repaired?
|
|
493 |
if (replacementTL->count() == 0) {
|
|
494 |
assert(replacementTL->head() == NULL &&
|
|
495 |
replacementTL->tail() == NULL, "list count is incorrect");
|
|
496 |
// Find the replacement node for the (soon to be empty) node being removed.
|
|
497 |
// if we have a single (or no) child, splice child in our stead
|
|
498 |
if (replacementTL->left() == NULL) {
|
|
499 |
// left is NULL so pick right. right may also be NULL.
|
|
500 |
newTL = replacementTL->right();
|
|
501 |
debug_only(replacementTL->clearRight();)
|
|
502 |
} else if (replacementTL->right() == NULL) {
|
|
503 |
// right is NULL
|
|
504 |
newTL = replacementTL->left();
|
|
505 |
debug_only(replacementTL->clearLeft();)
|
|
506 |
} else { // we have both children, so, by patriarchal convention,
|
|
507 |
// my replacement is least node in right sub-tree
|
|
508 |
complicatedSplice = true;
|
|
509 |
newTL = removeTreeMinimum(replacementTL->right());
|
|
510 |
assert(newTL != NULL && newTL->left() == NULL &&
|
|
511 |
newTL->right() == NULL, "sub-tree minimum exists");
|
|
512 |
}
|
|
513 |
// newTL is the replacement for the (soon to be empty) node.
|
|
514 |
// newTL may be NULL.
|
|
515 |
// should verify; we just cleanly excised our replacement
|
|
516 |
if (FLSVerifyDictionary) {
|
|
517 |
verifyTree();
|
|
518 |
}
|
|
519 |
// first make newTL my parent's child
|
|
520 |
if ((parentTL = replacementTL->parent()) == NULL) {
|
|
521 |
// newTL should be root
|
|
522 |
assert(tl == root(), "Incorrectly replacing root");
|
|
523 |
set_root(newTL);
|
|
524 |
if (newTL != NULL) {
|
|
525 |
newTL->clearParent();
|
|
526 |
}
|
|
527 |
} else if (parentTL->right() == replacementTL) {
|
|
528 |
// replacementTL is a right child
|
|
529 |
parentTL->setRight(newTL);
|
|
530 |
} else { // replacementTL is a left child
|
|
531 |
assert(parentTL->left() == replacementTL, "should be left child");
|
|
532 |
parentTL->setLeft(newTL);
|
|
533 |
}
|
|
534 |
debug_only(replacementTL->clearParent();)
|
|
535 |
if (complicatedSplice) { // we need newTL to get replacementTL's
|
|
536 |
// two children
|
|
537 |
assert(newTL != NULL &&
|
|
538 |
newTL->left() == NULL && newTL->right() == NULL,
|
|
539 |
"newTL should not have encumbrances from the past");
|
|
540 |
// we'd like to assert as below:
|
|
541 |
// assert(replacementTL->left() != NULL && replacementTL->right() != NULL,
|
|
542 |
// "else !complicatedSplice");
|
|
543 |
// ... however, the above assertion is too strong because we aren't
|
|
544 |
// guaranteed that replacementTL->right() is still NULL.
|
|
545 |
// Recall that we removed
|
|
546 |
// the right sub-tree minimum from replacementTL.
|
|
547 |
// That may well have been its right
|
|
548 |
// child! So we'll just assert half of the above:
|
|
549 |
assert(replacementTL->left() != NULL, "else !complicatedSplice");
|
|
550 |
newTL->setLeft(replacementTL->left());
|
|
551 |
newTL->setRight(replacementTL->right());
|
|
552 |
debug_only(
|
|
553 |
replacementTL->clearRight();
|
|
554 |
replacementTL->clearLeft();
|
|
555 |
)
|
|
556 |
}
|
|
557 |
assert(replacementTL->right() == NULL &&
|
|
558 |
replacementTL->left() == NULL &&
|
|
559 |
replacementTL->parent() == NULL,
|
|
560 |
"delete without encumbrances");
|
|
561 |
}
|
|
562 |
|
|
563 |
assert(totalSize() >= retTC->size(), "Incorrect total size");
|
|
564 |
dec_totalSize(retTC->size()); // size book-keeping
|
|
565 |
assert(totalFreeBlocks() > 0, "Incorrect total count");
|
|
566 |
set_totalFreeBlocks(totalFreeBlocks() - 1);
|
|
567 |
|
|
568 |
assert(retTC != NULL, "null chunk?");
|
|
569 |
assert(retTC->prev() == NULL && retTC->next() == NULL,
|
|
570 |
"should return without encumbrances");
|
|
571 |
if (FLSVerifyDictionary) {
|
|
572 |
verifyTree();
|
|
573 |
}
|
|
574 |
assert(!removing_only_chunk || _root == NULL, "root should be NULL");
|
|
575 |
return TreeChunk::as_TreeChunk(retTC);
|
|
576 |
}
|
|
577 |
|
|
578 |
// Remove the leftmost node (lm) in the tree and return it.
|
|
579 |
// If lm has a right child, link it to the left node of
|
|
580 |
// the parent of lm.
|
|
581 |
TreeList* BinaryTreeDictionary::removeTreeMinimum(TreeList* tl) {
|
|
582 |
assert(tl != NULL && tl->parent() != NULL, "really need a proper sub-tree");
|
|
583 |
// locate the subtree minimum by walking down left branches
|
|
584 |
TreeList* curTL = tl;
|
|
585 |
for (; curTL->left() != NULL; curTL = curTL->left());
|
|
586 |
// obviously curTL now has at most one child, a right child
|
|
587 |
if (curTL != root()) { // Should this test just be removed?
|
|
588 |
TreeList* parentTL = curTL->parent();
|
|
589 |
if (parentTL->left() == curTL) { // curTL is a left child
|
|
590 |
parentTL->setLeft(curTL->right());
|
|
591 |
} else {
|
|
592 |
// If the list tl has no left child, then curTL may be
|
|
593 |
// the right child of parentTL.
|
|
594 |
assert(parentTL->right() == curTL, "should be a right child");
|
|
595 |
parentTL->setRight(curTL->right());
|
|
596 |
}
|
|
597 |
} else {
|
|
598 |
// The only use of this method would not pass the root of the
|
|
599 |
// tree (as indicated by the assertion above that the tree list
|
|
600 |
// has a parent) but the specification does not explicitly exclude the
|
|
601 |
// passing of the root so accomodate it.
|
|
602 |
set_root(NULL);
|
|
603 |
}
|
|
604 |
debug_only(
|
|
605 |
curTL->clearParent(); // Test if this needs to be cleared
|
|
606 |
curTL->clearRight(); // recall, above, left child is already null
|
|
607 |
)
|
|
608 |
// we just excised a (non-root) node, we should still verify all tree invariants
|
|
609 |
if (FLSVerifyDictionary) {
|
|
610 |
verifyTree();
|
|
611 |
}
|
|
612 |
return curTL;
|
|
613 |
}
|
|
614 |
|
|
615 |
// Based on a simplification of the algorithm by Sleator and Tarjan (JACM 1985).
|
|
616 |
// The simplifications are the following:
|
|
617 |
// . we splay only when we delete (not when we insert)
|
|
618 |
// . we apply a single spay step per deletion/access
|
|
619 |
// By doing such partial splaying, we reduce the amount of restructuring,
|
|
620 |
// while getting a reasonably efficient search tree (we think).
|
|
621 |
// [Measurements will be needed to (in)validate this expectation.]
|
|
622 |
|
|
623 |
void BinaryTreeDictionary::semiSplayStep(TreeList* tc) {
|
|
624 |
// apply a semi-splay step at the given node:
|
|
625 |
// . if root, norting needs to be done
|
|
626 |
// . if child of root, splay once
|
|
627 |
// . else zig-zig or sig-zag depending on path from grandparent
|
|
628 |
if (root() == tc) return;
|
|
629 |
warning("*** Splaying not yet implemented; "
|
|
630 |
"tree operations may be inefficient ***");
|
|
631 |
}
|
|
632 |
|
|
633 |
void BinaryTreeDictionary::insertChunkInTree(FreeChunk* fc) {
|
|
634 |
TreeList *curTL, *prevTL;
|
|
635 |
size_t size = fc->size();
|
|
636 |
|
|
637 |
assert(size >= MIN_TREE_CHUNK_SIZE, "too small to be a TreeList");
|
|
638 |
if (FLSVerifyDictionary) {
|
|
639 |
verifyTree();
|
|
640 |
}
|
|
641 |
// XXX: do i need to clear the FreeChunk fields, let me do it just in case
|
|
642 |
// Revisit this later
|
|
643 |
|
|
644 |
fc->clearNext();
|
|
645 |
fc->linkPrev(NULL);
|
|
646 |
|
|
647 |
// work down from the _root, looking for insertion point
|
|
648 |
for (prevTL = curTL = root(); curTL != NULL;) {
|
|
649 |
if (curTL->size() == size) // exact match
|
|
650 |
break;
|
|
651 |
prevTL = curTL;
|
|
652 |
if (curTL->size() > size) { // follow left branch
|
|
653 |
curTL = curTL->left();
|
|
654 |
} else { // follow right branch
|
|
655 |
assert(curTL->size() < size, "size inconsistency");
|
|
656 |
curTL = curTL->right();
|
|
657 |
}
|
|
658 |
}
|
|
659 |
TreeChunk* tc = TreeChunk::as_TreeChunk(fc);
|
|
660 |
// This chunk is being returned to the binary try. It's embedded
|
|
661 |
// TreeList should be unused at this point.
|
|
662 |
tc->initialize();
|
|
663 |
if (curTL != NULL) { // exact match
|
|
664 |
tc->set_list(curTL);
|
|
665 |
curTL->returnChunkAtTail(tc);
|
|
666 |
} else { // need a new node in tree
|
|
667 |
tc->clearNext();
|
|
668 |
tc->linkPrev(NULL);
|
|
669 |
TreeList* newTL = TreeList::as_TreeList(tc);
|
|
670 |
assert(((TreeChunk*)tc)->list() == newTL,
|
|
671 |
"List was not initialized correctly");
|
|
672 |
if (prevTL == NULL) { // we are the only tree node
|
|
673 |
assert(root() == NULL, "control point invariant");
|
|
674 |
set_root(newTL);
|
|
675 |
} else { // insert under prevTL ...
|
|
676 |
if (prevTL->size() < size) { // am right child
|
|
677 |
assert(prevTL->right() == NULL, "control point invariant");
|
|
678 |
prevTL->setRight(newTL);
|
|
679 |
} else { // am left child
|
|
680 |
assert(prevTL->size() > size && prevTL->left() == NULL, "cpt pt inv");
|
|
681 |
prevTL->setLeft(newTL);
|
|
682 |
}
|
|
683 |
}
|
|
684 |
}
|
|
685 |
assert(tc->list() != NULL, "Tree list should be set");
|
|
686 |
|
|
687 |
inc_totalSize(size);
|
|
688 |
// Method 'totalSizeInTree' walks through the every block in the
|
|
689 |
// tree, so it can cause significant performance loss if there are
|
|
690 |
// many blocks in the tree
|
|
691 |
assert(!FLSVerifyDictionary || totalSizeInTree(root()) == totalSize(), "_totalSize inconsistency");
|
|
692 |
set_totalFreeBlocks(totalFreeBlocks() + 1);
|
|
693 |
if (FLSVerifyDictionary) {
|
|
694 |
verifyTree();
|
|
695 |
}
|
|
696 |
}
|
|
697 |
|
|
698 |
size_t BinaryTreeDictionary::maxChunkSize() const {
|
|
699 |
verify_par_locked();
|
|
700 |
TreeList* tc = root();
|
|
701 |
if (tc == NULL) return 0;
|
|
702 |
for (; tc->right() != NULL; tc = tc->right());
|
|
703 |
return tc->size();
|
|
704 |
}
|
|
705 |
|
|
706 |
size_t BinaryTreeDictionary::totalListLength(TreeList* tl) const {
|
|
707 |
size_t res;
|
|
708 |
res = tl->count();
|
|
709 |
#ifdef ASSERT
|
|
710 |
size_t cnt;
|
|
711 |
FreeChunk* tc = tl->head();
|
|
712 |
for (cnt = 0; tc != NULL; tc = tc->next(), cnt++);
|
|
713 |
assert(res == cnt, "The count is not being maintained correctly");
|
|
714 |
#endif
|
|
715 |
return res;
|
|
716 |
}
|
|
717 |
|
|
718 |
size_t BinaryTreeDictionary::totalSizeInTree(TreeList* tl) const {
|
|
719 |
if (tl == NULL)
|
|
720 |
return 0;
|
|
721 |
return (tl->size() * totalListLength(tl)) +
|
|
722 |
totalSizeInTree(tl->left()) +
|
|
723 |
totalSizeInTree(tl->right());
|
|
724 |
}
|
|
725 |
|
|
726 |
double BinaryTreeDictionary::sum_of_squared_block_sizes(TreeList* const tl) const {
|
|
727 |
if (tl == NULL) {
|
|
728 |
return 0.0;
|
|
729 |
}
|
|
730 |
double size = (double)(tl->size());
|
|
731 |
double curr = size * size * totalListLength(tl);
|
|
732 |
curr += sum_of_squared_block_sizes(tl->left());
|
|
733 |
curr += sum_of_squared_block_sizes(tl->right());
|
|
734 |
return curr;
|
|
735 |
}
|
|
736 |
|
|
737 |
size_t BinaryTreeDictionary::totalFreeBlocksInTree(TreeList* tl) const {
|
|
738 |
if (tl == NULL)
|
|
739 |
return 0;
|
|
740 |
return totalListLength(tl) +
|
|
741 |
totalFreeBlocksInTree(tl->left()) +
|
|
742 |
totalFreeBlocksInTree(tl->right());
|
|
743 |
}
|
|
744 |
|
|
745 |
size_t BinaryTreeDictionary::numFreeBlocks() const {
|
|
746 |
assert(totalFreeBlocksInTree(root()) == totalFreeBlocks(),
|
|
747 |
"_totalFreeBlocks inconsistency");
|
|
748 |
return totalFreeBlocks();
|
|
749 |
}
|
|
750 |
|
|
751 |
size_t BinaryTreeDictionary::treeHeightHelper(TreeList* tl) const {
|
|
752 |
if (tl == NULL)
|
|
753 |
return 0;
|
|
754 |
return 1 + MAX2(treeHeightHelper(tl->left()),
|
|
755 |
treeHeightHelper(tl->right()));
|
|
756 |
}
|
|
757 |
|
|
758 |
size_t BinaryTreeDictionary::treeHeight() const {
|
|
759 |
return treeHeightHelper(root());
|
|
760 |
}
|
|
761 |
|
|
762 |
size_t BinaryTreeDictionary::totalNodesHelper(TreeList* tl) const {
|
|
763 |
if (tl == NULL) {
|
|
764 |
return 0;
|
|
765 |
}
|
|
766 |
return 1 + totalNodesHelper(tl->left()) +
|
|
767 |
totalNodesHelper(tl->right());
|
|
768 |
}
|
|
769 |
|
|
770 |
size_t BinaryTreeDictionary::totalNodesInTree(TreeList* tl) const {
|
|
771 |
return totalNodesHelper(root());
|
|
772 |
}
|
|
773 |
|
|
774 |
void BinaryTreeDictionary::dictCensusUpdate(size_t size, bool split, bool birth){
|
|
775 |
TreeList* nd = findList(size);
|
|
776 |
if (nd) {
|
|
777 |
if (split) {
|
|
778 |
if (birth) {
|
|
779 |
nd->increment_splitBirths();
|
|
780 |
nd->increment_surplus();
|
|
781 |
} else {
|
|
782 |
nd->increment_splitDeaths();
|
|
783 |
nd->decrement_surplus();
|
|
784 |
}
|
|
785 |
} else {
|
|
786 |
if (birth) {
|
|
787 |
nd->increment_coalBirths();
|
|
788 |
nd->increment_surplus();
|
|
789 |
} else {
|
|
790 |
nd->increment_coalDeaths();
|
|
791 |
nd->decrement_surplus();
|
|
792 |
}
|
|
793 |
}
|
|
794 |
}
|
|
795 |
// A list for this size may not be found (nd == 0) if
|
|
796 |
// This is a death where the appropriate list is now
|
|
797 |
// empty and has been removed from the list.
|
|
798 |
// This is a birth associated with a LinAB. The chunk
|
|
799 |
// for the LinAB is not in the dictionary.
|
|
800 |
}
|
|
801 |
|
|
802 |
bool BinaryTreeDictionary::coalDictOverPopulated(size_t size) {
|
|
803 |
TreeList* list_of_size = findList(size);
|
|
804 |
// None of requested size implies overpopulated.
|
|
805 |
return list_of_size == NULL || list_of_size->coalDesired() <= 0 ||
|
|
806 |
list_of_size->count() > list_of_size->coalDesired();
|
|
807 |
}
|
|
808 |
|
|
809 |
// Closures for walking the binary tree.
|
|
810 |
// do_list() walks the free list in a node applying the closure
|
|
811 |
// to each free chunk in the list
|
|
812 |
// do_tree() walks the nodes in the binary tree applying do_list()
|
|
813 |
// to each list at each node.
|
|
814 |
|
|
815 |
class TreeCensusClosure : public StackObj {
|
|
816 |
protected:
|
|
817 |
virtual void do_list(FreeList* fl) = 0;
|
|
818 |
public:
|
|
819 |
virtual void do_tree(TreeList* tl) = 0;
|
|
820 |
};
|
|
821 |
|
|
822 |
class AscendTreeCensusClosure : public TreeCensusClosure {
|
|
823 |
public:
|
|
824 |
void do_tree(TreeList* tl) {
|
|
825 |
if (tl != NULL) {
|
|
826 |
do_tree(tl->left());
|
|
827 |
do_list(tl);
|
|
828 |
do_tree(tl->right());
|
|
829 |
}
|
|
830 |
}
|
|
831 |
};
|
|
832 |
|
|
833 |
class DescendTreeCensusClosure : public TreeCensusClosure {
|
|
834 |
public:
|
|
835 |
void do_tree(TreeList* tl) {
|
|
836 |
if (tl != NULL) {
|
|
837 |
do_tree(tl->right());
|
|
838 |
do_list(tl);
|
|
839 |
do_tree(tl->left());
|
|
840 |
}
|
|
841 |
}
|
|
842 |
};
|
|
843 |
|
|
844 |
// For each list in the tree, calculate the desired, desired
|
|
845 |
// coalesce, count before sweep, and surplus before sweep.
|
|
846 |
class BeginSweepClosure : public AscendTreeCensusClosure {
|
|
847 |
double _percentage;
|
|
848 |
float _inter_sweep_current;
|
|
849 |
float _inter_sweep_estimate;
|
|
850 |
|
|
851 |
public:
|
|
852 |
BeginSweepClosure(double p, float inter_sweep_current,
|
|
853 |
float inter_sweep_estimate) :
|
|
854 |
_percentage(p),
|
|
855 |
_inter_sweep_current(inter_sweep_current),
|
|
856 |
_inter_sweep_estimate(inter_sweep_estimate) { }
|
|
857 |
|
|
858 |
void do_list(FreeList* fl) {
|
|
859 |
double coalSurplusPercent = _percentage;
|
|
860 |
fl->compute_desired(_inter_sweep_current, _inter_sweep_estimate);
|
|
861 |
fl->set_coalDesired((ssize_t)((double)fl->desired() * coalSurplusPercent));
|
|
862 |
fl->set_beforeSweep(fl->count());
|
|
863 |
fl->set_bfrSurp(fl->surplus());
|
|
864 |
}
|
|
865 |
};
|
|
866 |
|
|
867 |
// Used to search the tree until a condition is met.
|
|
868 |
// Similar to TreeCensusClosure but searches the
|
|
869 |
// tree and returns promptly when found.
|
|
870 |
|
|
871 |
class TreeSearchClosure : public StackObj {
|
|
872 |
protected:
|
|
873 |
virtual bool do_list(FreeList* fl) = 0;
|
|
874 |
public:
|
|
875 |
virtual bool do_tree(TreeList* tl) = 0;
|
|
876 |
};
|
|
877 |
|
|
878 |
#if 0 // Don't need this yet but here for symmetry.
|
|
879 |
class AscendTreeSearchClosure : public TreeSearchClosure {
|
|
880 |
public:
|
|
881 |
bool do_tree(TreeList* tl) {
|
|
882 |
if (tl != NULL) {
|
|
883 |
if (do_tree(tl->left())) return true;
|
|
884 |
if (do_list(tl)) return true;
|
|
885 |
if (do_tree(tl->right())) return true;
|
|
886 |
}
|
|
887 |
return false;
|
|
888 |
}
|
|
889 |
};
|
|
890 |
#endif
|
|
891 |
|
|
892 |
class DescendTreeSearchClosure : public TreeSearchClosure {
|
|
893 |
public:
|
|
894 |
bool do_tree(TreeList* tl) {
|
|
895 |
if (tl != NULL) {
|
|
896 |
if (do_tree(tl->right())) return true;
|
|
897 |
if (do_list(tl)) return true;
|
|
898 |
if (do_tree(tl->left())) return true;
|
|
899 |
}
|
|
900 |
return false;
|
|
901 |
}
|
|
902 |
};
|
|
903 |
|
|
904 |
// Searches the tree for a chunk that ends at the
|
|
905 |
// specified address.
|
|
906 |
class EndTreeSearchClosure : public DescendTreeSearchClosure {
|
|
907 |
HeapWord* _target;
|
|
908 |
FreeChunk* _found;
|
|
909 |
|
|
910 |
public:
|
|
911 |
EndTreeSearchClosure(HeapWord* target) : _target(target), _found(NULL) {}
|
|
912 |
bool do_list(FreeList* fl) {
|
|
913 |
FreeChunk* item = fl->head();
|
|
914 |
while (item != NULL) {
|
|
915 |
if (item->end() == _target) {
|
|
916 |
_found = item;
|
|
917 |
return true;
|
|
918 |
}
|
|
919 |
item = item->next();
|
|
920 |
}
|
|
921 |
return false;
|
|
922 |
}
|
|
923 |
FreeChunk* found() { return _found; }
|
|
924 |
};
|
|
925 |
|
|
926 |
FreeChunk* BinaryTreeDictionary::find_chunk_ends_at(HeapWord* target) const {
|
|
927 |
EndTreeSearchClosure etsc(target);
|
|
928 |
bool found_target = etsc.do_tree(root());
|
|
929 |
assert(found_target || etsc.found() == NULL, "Consistency check");
|
|
930 |
assert(!found_target || etsc.found() != NULL, "Consistency check");
|
|
931 |
return etsc.found();
|
|
932 |
}
|
|
933 |
|
|
934 |
void BinaryTreeDictionary::beginSweepDictCensus(double coalSurplusPercent,
|
|
935 |
float inter_sweep_current, float inter_sweep_estimate) {
|
|
936 |
BeginSweepClosure bsc(coalSurplusPercent, inter_sweep_current,
|
|
937 |
inter_sweep_estimate);
|
|
938 |
bsc.do_tree(root());
|
|
939 |
}
|
|
940 |
|
|
941 |
// Closures and methods for calculating total bytes returned to the
|
|
942 |
// free lists in the tree.
|
|
943 |
NOT_PRODUCT(
|
|
944 |
class InitializeDictReturnedBytesClosure : public AscendTreeCensusClosure {
|
|
945 |
public:
|
|
946 |
void do_list(FreeList* fl) {
|
|
947 |
fl->set_returnedBytes(0);
|
|
948 |
}
|
|
949 |
};
|
|
950 |
|
|
951 |
void BinaryTreeDictionary::initializeDictReturnedBytes() {
|
|
952 |
InitializeDictReturnedBytesClosure idrb;
|
|
953 |
idrb.do_tree(root());
|
|
954 |
}
|
|
955 |
|
|
956 |
class ReturnedBytesClosure : public AscendTreeCensusClosure {
|
|
957 |
size_t _dictReturnedBytes;
|
|
958 |
public:
|
|
959 |
ReturnedBytesClosure() { _dictReturnedBytes = 0; }
|
|
960 |
void do_list(FreeList* fl) {
|
|
961 |
_dictReturnedBytes += fl->returnedBytes();
|
|
962 |
}
|
|
963 |
size_t dictReturnedBytes() { return _dictReturnedBytes; }
|
|
964 |
};
|
|
965 |
|
|
966 |
size_t BinaryTreeDictionary::sumDictReturnedBytes() {
|
|
967 |
ReturnedBytesClosure rbc;
|
|
968 |
rbc.do_tree(root());
|
|
969 |
|
|
970 |
return rbc.dictReturnedBytes();
|
|
971 |
}
|
|
972 |
|
|
973 |
// Count the number of entries in the tree.
|
|
974 |
class treeCountClosure : public DescendTreeCensusClosure {
|
|
975 |
public:
|
|
976 |
uint count;
|
|
977 |
treeCountClosure(uint c) { count = c; }
|
|
978 |
void do_list(FreeList* fl) {
|
|
979 |
count++;
|
|
980 |
}
|
|
981 |
};
|
|
982 |
|
|
983 |
size_t BinaryTreeDictionary::totalCount() {
|
|
984 |
treeCountClosure ctc(0);
|
|
985 |
ctc.do_tree(root());
|
|
986 |
return ctc.count;
|
|
987 |
}
|
|
988 |
)
|
|
989 |
|
|
990 |
// Calculate surpluses for the lists in the tree.
|
|
991 |
class setTreeSurplusClosure : public AscendTreeCensusClosure {
|
|
992 |
double percentage;
|
|
993 |
public:
|
|
994 |
setTreeSurplusClosure(double v) { percentage = v; }
|
|
995 |
void do_list(FreeList* fl) {
|
|
996 |
double splitSurplusPercent = percentage;
|
|
997 |
fl->set_surplus(fl->count() -
|
|
998 |
(ssize_t)((double)fl->desired() * splitSurplusPercent));
|
|
999 |
}
|
|
1000 |
};
|
|
1001 |
|
|
1002 |
void BinaryTreeDictionary::setTreeSurplus(double splitSurplusPercent) {
|
|
1003 |
setTreeSurplusClosure sts(splitSurplusPercent);
|
|
1004 |
sts.do_tree(root());
|
|
1005 |
}
|
|
1006 |
|
|
1007 |
// Set hints for the lists in the tree.
|
|
1008 |
class setTreeHintsClosure : public DescendTreeCensusClosure {
|
|
1009 |
size_t hint;
|
|
1010 |
public:
|
|
1011 |
setTreeHintsClosure(size_t v) { hint = v; }
|
|
1012 |
void do_list(FreeList* fl) {
|
|
1013 |
fl->set_hint(hint);
|
|
1014 |
assert(fl->hint() == 0 || fl->hint() > fl->size(),
|
|
1015 |
"Current hint is inconsistent");
|
|
1016 |
if (fl->surplus() > 0) {
|
|
1017 |
hint = fl->size();
|
|
1018 |
}
|
|
1019 |
}
|
|
1020 |
};
|
|
1021 |
|
|
1022 |
void BinaryTreeDictionary::setTreeHints(void) {
|
|
1023 |
setTreeHintsClosure sth(0);
|
|
1024 |
sth.do_tree(root());
|
|
1025 |
}
|
|
1026 |
|
|
1027 |
// Save count before previous sweep and splits and coalesces.
|
|
1028 |
class clearTreeCensusClosure : public AscendTreeCensusClosure {
|
|
1029 |
void do_list(FreeList* fl) {
|
|
1030 |
fl->set_prevSweep(fl->count());
|
|
1031 |
fl->set_coalBirths(0);
|
|
1032 |
fl->set_coalDeaths(0);
|
|
1033 |
fl->set_splitBirths(0);
|
|
1034 |
fl->set_splitDeaths(0);
|
|
1035 |
}
|
|
1036 |
};
|
|
1037 |
|
|
1038 |
void BinaryTreeDictionary::clearTreeCensus(void) {
|
|
1039 |
clearTreeCensusClosure ctc;
|
|
1040 |
ctc.do_tree(root());
|
|
1041 |
}
|
|
1042 |
|
|
1043 |
// Do reporting and post sweep clean up.
|
|
1044 |
void BinaryTreeDictionary::endSweepDictCensus(double splitSurplusPercent) {
|
|
1045 |
// Does walking the tree 3 times hurt?
|
|
1046 |
setTreeSurplus(splitSurplusPercent);
|
|
1047 |
setTreeHints();
|
|
1048 |
if (PrintGC && Verbose) {
|
|
1049 |
reportStatistics();
|
|
1050 |
}
|
|
1051 |
clearTreeCensus();
|
|
1052 |
}
|
|
1053 |
|
|
1054 |
// Print summary statistics
|
|
1055 |
void BinaryTreeDictionary::reportStatistics() const {
|
|
1056 |
verify_par_locked();
|
|
1057 |
gclog_or_tty->print("Statistics for BinaryTreeDictionary:\n"
|
|
1058 |
"------------------------------------\n");
|
|
1059 |
size_t totalSize = totalChunkSize(debug_only(NULL));
|
|
1060 |
size_t freeBlocks = numFreeBlocks();
|
|
1061 |
gclog_or_tty->print("Total Free Space: %d\n", totalSize);
|
|
1062 |
gclog_or_tty->print("Max Chunk Size: %d\n", maxChunkSize());
|
|
1063 |
gclog_or_tty->print("Number of Blocks: %d\n", freeBlocks);
|
|
1064 |
if (freeBlocks > 0) {
|
|
1065 |
gclog_or_tty->print("Av. Block Size: %d\n", totalSize/freeBlocks);
|
|
1066 |
}
|
|
1067 |
gclog_or_tty->print("Tree Height: %d\n", treeHeight());
|
|
1068 |
}
|
|
1069 |
|
|
1070 |
// Print census information - counts, births, deaths, etc.
|
|
1071 |
// for each list in the tree. Also print some summary
|
|
1072 |
// information.
|
|
1073 |
class printTreeCensusClosure : public AscendTreeCensusClosure {
|
|
1074 |
size_t _totalFree;
|
|
1075 |
AllocationStats _totals;
|
|
1076 |
size_t _count;
|
|
1077 |
|
|
1078 |
public:
|
|
1079 |
printTreeCensusClosure() {
|
|
1080 |
_totalFree = 0;
|
|
1081 |
_count = 0;
|
|
1082 |
_totals.initialize();
|
|
1083 |
}
|
|
1084 |
AllocationStats* totals() { return &_totals; }
|
|
1085 |
size_t count() { return _count; }
|
|
1086 |
void increment_count_by(size_t v) { _count += v; }
|
|
1087 |
size_t totalFree() { return _totalFree; }
|
|
1088 |
void increment_totalFree_by(size_t v) { _totalFree += v; }
|
|
1089 |
void do_list(FreeList* fl) {
|
|
1090 |
bool nl = false; // "maybe this is not needed" isNearLargestChunk(fl->head());
|
|
1091 |
|
|
1092 |
gclog_or_tty->print("%c %4d\t\t" "%7d\t" "%7d\t"
|
|
1093 |
"%7d\t" "%7d\t" "%7d\t" "%7d\t"
|
|
1094 |
"%7d\t" "%7d\t" "%7d\t"
|
|
1095 |
"%7d\t" "\n",
|
|
1096 |
" n"[nl], fl->size(), fl->bfrSurp(), fl->surplus(),
|
|
1097 |
fl->desired(), fl->prevSweep(), fl->beforeSweep(), fl->count(),
|
|
1098 |
fl->coalBirths(), fl->coalDeaths(), fl->splitBirths(),
|
|
1099 |
fl->splitDeaths());
|
|
1100 |
|
|
1101 |
increment_totalFree_by(fl->count() * fl->size());
|
|
1102 |
increment_count_by(fl->count());
|
|
1103 |
totals()->set_bfrSurp(totals()->bfrSurp() + fl->bfrSurp());
|
|
1104 |
totals()->set_surplus(totals()->splitDeaths() + fl->surplus());
|
|
1105 |
totals()->set_prevSweep(totals()->prevSweep() + fl->prevSweep());
|
|
1106 |
totals()->set_beforeSweep(totals()->beforeSweep() + fl->beforeSweep());
|
|
1107 |
totals()->set_coalBirths(totals()->coalBirths() + fl->coalBirths());
|
|
1108 |
totals()->set_coalDeaths(totals()->coalDeaths() + fl->coalDeaths());
|
|
1109 |
totals()->set_splitBirths(totals()->splitBirths() + fl->splitBirths());
|
|
1110 |
totals()->set_splitDeaths(totals()->splitDeaths() + fl->splitDeaths());
|
|
1111 |
}
|
|
1112 |
};
|
|
1113 |
|
|
1114 |
void BinaryTreeDictionary::printDictCensus(void) const {
|
|
1115 |
|
|
1116 |
gclog_or_tty->print("\nBinaryTree\n");
|
|
1117 |
gclog_or_tty->print(
|
|
1118 |
"%4s\t\t" "%7s\t" "%7s\t" "%7s\t" "%7s\t" "%7s\t"
|
|
1119 |
"%7s\t" "%7s\t" "%7s\t" "%7s\t" "%7s\t" "\n",
|
|
1120 |
"size", "bfrsurp", "surplus", "desired", "prvSwep", "bfrSwep",
|
|
1121 |
"count", "cBirths", "cDeaths", "sBirths", "sDeaths");
|
|
1122 |
|
|
1123 |
printTreeCensusClosure ptc;
|
|
1124 |
ptc.do_tree(root());
|
|
1125 |
|
|
1126 |
gclog_or_tty->print(
|
|
1127 |
"\t\t" "%7s\t" "%7s\t" "%7s\t" "%7s\t"
|
|
1128 |
"%7s\t" "%7s\t" "%7s\t" "%7s\t" "%7s\t" "\n",
|
|
1129 |
"bfrsurp", "surplus", "prvSwep", "bfrSwep",
|
|
1130 |
"count", "cBirths", "cDeaths", "sBirths", "sDeaths");
|
|
1131 |
gclog_or_tty->print(
|
|
1132 |
"%s\t\t" "%7d\t" "%7d\t" "%7d\t" "%7d\t"
|
|
1133 |
"%7d\t" "%7d\t" "%7d\t" "%7d\t" "%7d\t" "\n",
|
|
1134 |
"totl",
|
|
1135 |
ptc.totals()->bfrSurp(),
|
|
1136 |
ptc.totals()->surplus(),
|
|
1137 |
ptc.totals()->prevSweep(),
|
|
1138 |
ptc.totals()->beforeSweep(),
|
|
1139 |
ptc.count(),
|
|
1140 |
ptc.totals()->coalBirths(),
|
|
1141 |
ptc.totals()->coalDeaths(),
|
|
1142 |
ptc.totals()->splitBirths(),
|
|
1143 |
ptc.totals()->splitDeaths());
|
|
1144 |
gclog_or_tty->print("totalFree(words): %7d growth: %8.5f deficit: %8.5f\n",
|
|
1145 |
ptc.totalFree(),
|
|
1146 |
(double)(ptc.totals()->splitBirths()+ptc.totals()->coalBirths()
|
|
1147 |
-ptc.totals()->splitDeaths()-ptc.totals()->coalDeaths())
|
|
1148 |
/(ptc.totals()->prevSweep() != 0 ?
|
|
1149 |
(double)ptc.totals()->prevSweep() : 1.0),
|
|
1150 |
(double)(ptc.totals()->desired() - ptc.count())
|
|
1151 |
/(ptc.totals()->desired() != 0 ?
|
|
1152 |
(double)ptc.totals()->desired() : 1.0));
|
|
1153 |
}
|
|
1154 |
|
|
1155 |
// Verify the following tree invariants:
|
|
1156 |
// . _root has no parent
|
|
1157 |
// . parent and child point to each other
|
|
1158 |
// . each node's key correctly related to that of its child(ren)
|
|
1159 |
void BinaryTreeDictionary::verifyTree() const {
|
|
1160 |
guarantee(root() == NULL || totalFreeBlocks() == 0 ||
|
|
1161 |
totalSize() != 0, "_totalSize should't be 0?");
|
|
1162 |
guarantee(root() == NULL || root()->parent() == NULL, "_root shouldn't have parent");
|
|
1163 |
verifyTreeHelper(root());
|
|
1164 |
}
|
|
1165 |
|
|
1166 |
size_t BinaryTreeDictionary::verifyPrevFreePtrs(TreeList* tl) {
|
|
1167 |
size_t ct = 0;
|
|
1168 |
for (FreeChunk* curFC = tl->head(); curFC != NULL; curFC = curFC->next()) {
|
|
1169 |
ct++;
|
|
1170 |
assert(curFC->prev() == NULL || curFC->prev()->isFree(),
|
|
1171 |
"Chunk should be free");
|
|
1172 |
}
|
|
1173 |
return ct;
|
|
1174 |
}
|
|
1175 |
|
|
1176 |
// Note: this helper is recursive rather than iterative, so use with
|
|
1177 |
// caution on very deep trees; and watch out for stack overflow errors;
|
|
1178 |
// In general, to be used only for debugging.
|
|
1179 |
void BinaryTreeDictionary::verifyTreeHelper(TreeList* tl) const {
|
|
1180 |
if (tl == NULL)
|
|
1181 |
return;
|
|
1182 |
guarantee(tl->size() != 0, "A list must has a size");
|
|
1183 |
guarantee(tl->left() == NULL || tl->left()->parent() == tl,
|
|
1184 |
"parent<-/->left");
|
|
1185 |
guarantee(tl->right() == NULL || tl->right()->parent() == tl,
|
|
1186 |
"parent<-/->right");;
|
|
1187 |
guarantee(tl->left() == NULL || tl->left()->size() < tl->size(),
|
|
1188 |
"parent !> left");
|
|
1189 |
guarantee(tl->right() == NULL || tl->right()->size() > tl->size(),
|
|
1190 |
"parent !< left");
|
|
1191 |
guarantee(tl->head() == NULL || tl->head()->isFree(), "!Free");
|
|
1192 |
guarantee(tl->head() == NULL || tl->head_as_TreeChunk()->list() == tl,
|
|
1193 |
"list inconsistency");
|
|
1194 |
guarantee(tl->count() > 0 || (tl->head() == NULL && tl->tail() == NULL),
|
|
1195 |
"list count is inconsistent");
|
|
1196 |
guarantee(tl->count() > 1 || tl->head() == tl->tail(),
|
|
1197 |
"list is incorrectly constructed");
|
|
1198 |
size_t count = verifyPrevFreePtrs(tl);
|
|
1199 |
guarantee(count == (size_t)tl->count(), "Node count is incorrect");
|
|
1200 |
if (tl->head() != NULL) {
|
|
1201 |
tl->head_as_TreeChunk()->verifyTreeChunkList();
|
|
1202 |
}
|
|
1203 |
verifyTreeHelper(tl->left());
|
|
1204 |
verifyTreeHelper(tl->right());
|
|
1205 |
}
|
|
1206 |
|
|
1207 |
void BinaryTreeDictionary::verify() const {
|
|
1208 |
verifyTree();
|
|
1209 |
guarantee(totalSize() == totalSizeInTree(root()), "Total Size inconsistency");
|
|
1210 |
}
|