author | stefank |
Wed, 05 Jul 2017 11:33:17 +0200 | |
changeset 46625 | edefffab74e2 |
parent 46619 | a3919f5e8d2b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2016, 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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#ifndef SHARE_VM_GC_SHARED_CARDTABLEMODREFBS_HPP |
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#define SHARE_VM_GC_SHARED_CARDTABLEMODREFBS_HPP |
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#include "gc/shared/modRefBarrierSet.hpp" |
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#include "oops/oop.hpp" |
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#include "utilities/align.hpp" |
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// This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
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// enumerate ref fields that have been modified (since the last |
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// enumeration.) |
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// As it currently stands, this barrier is *imprecise*: when a ref field in |
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// an object "o" is modified, the card table entry for the card containing |
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// the head of "o" is dirtied, not necessarily the card containing the |
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// modified field itself. For object arrays, however, the barrier *is* |
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// precise; only the card containing the modified element is dirtied. |
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// Closures used to scan dirty cards should take these |
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// considerations into account. |
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class CardTableModRefBS: public ModRefBarrierSet { |
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// Some classes get to look at some private stuff. |
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friend class VMStructs; |
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protected: |
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enum CardValues { |
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clean_card = -1, |
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// The mask contains zeros in places for all other values. |
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clean_card_mask = clean_card - 31, |
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dirty_card = 0, |
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precleaned_card = 1, |
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claimed_card = 2, |
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deferred_card = 4, |
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last_card = 8, |
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CT_MR_BS_last_reserved = 16 |
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}; |
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// a word's worth (row) of clean card values |
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static const intptr_t clean_card_row = (intptr_t)(-1); |
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// The declaration order of these const fields is important; see the |
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// constructor before changing. |
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const MemRegion _whole_heap; // the region covered by the card table |
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size_t _guard_index; // index of very last element in the card |
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// table; it is set to a guard value |
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// (last_card) and should never be modified |
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size_t _last_valid_index; // index of the last valid element |
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const size_t _page_size; // page size used when mapping _byte_map |
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size_t _byte_map_size; // in bytes |
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jbyte* _byte_map; // the card marking array |
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int _cur_covered_regions; |
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// The covered regions should be in address order. |
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MemRegion* _covered; |
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// The committed regions correspond one-to-one to the covered regions. |
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// They represent the card-table memory that has been committed to service |
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// the corresponding covered region. It may be that committed region for |
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// one covered region corresponds to a larger region because of page-size |
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// roundings. Thus, a committed region for one covered region may |
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// actually extend onto the card-table space for the next covered region. |
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MemRegion* _committed; |
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// The last card is a guard card, and we commit the page for it so |
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// we can use the card for verification purposes. We make sure we never |
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// uncommit the MemRegion for that page. |
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MemRegion _guard_region; |
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protected: |
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inline size_t compute_byte_map_size(); |
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// Finds and return the index of the region, if any, to which the given |
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// region would be contiguous. If none exists, assign a new region and |
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// returns its index. Requires that no more than the maximum number of |
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// covered regions defined in the constructor are ever in use. |
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int find_covering_region_by_base(HeapWord* base); |
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// Same as above, but finds the region containing the given address |
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// instead of starting at a given base address. |
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int find_covering_region_containing(HeapWord* addr); |
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// Resize one of the regions covered by the remembered set. |
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virtual void resize_covered_region(MemRegion new_region); |
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// Returns the leftmost end of a committed region corresponding to a |
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// covered region before covered region "ind", or else "NULL" if "ind" is |
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// the first covered region. |
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HeapWord* largest_prev_committed_end(int ind) const; |
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// Returns the part of the region mr that doesn't intersect with |
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// any committed region other than self. Used to prevent uncommitting |
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// regions that are also committed by other regions. Also protects |
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// against uncommitting the guard region. |
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MemRegion committed_unique_to_self(int self, MemRegion mr) const; |
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// Mapping from address to card marking array entry |
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jbyte* byte_for(const void* p) const { |
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assert(_whole_heap.contains(p), |
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"Attempt to access p = " PTR_FORMAT " out of bounds of " |
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" card marking array's _whole_heap = [" PTR_FORMAT "," PTR_FORMAT ")", |
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p2i(p), p2i(_whole_heap.start()), p2i(_whole_heap.end())); |
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jbyte* result = &byte_map_base[uintptr_t(p) >> card_shift]; |
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assert(result >= _byte_map && result < _byte_map + _byte_map_size, |
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"out of bounds accessor for card marking array"); |
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return result; |
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} |
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// The card table byte one after the card marking array |
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// entry for argument address. Typically used for higher bounds |
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// for loops iterating through the card table. |
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jbyte* byte_after(const void* p) const { |
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return byte_for(p) + 1; |
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} |
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protected: |
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// Dirty the bytes corresponding to "mr" (not all of which must be |
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// covered.) |
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void dirty_MemRegion(MemRegion mr); |
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// Clear (to clean_card) the bytes entirely contained within "mr" (not |
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// all of which must be covered.) |
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void clear_MemRegion(MemRegion mr); |
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public: |
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// Constants |
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enum SomePublicConstants { |
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card_shift = 9, |
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card_size = 1 << card_shift, |
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card_size_in_words = card_size / sizeof(HeapWord) |
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}; |
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static int clean_card_val() { return clean_card; } |
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static int clean_card_mask_val() { return clean_card_mask; } |
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static int dirty_card_val() { return dirty_card; } |
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static int claimed_card_val() { return claimed_card; } |
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static int precleaned_card_val() { return precleaned_card; } |
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static int deferred_card_val() { return deferred_card; } |
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virtual void initialize(); |
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// *** Barrier set functions. |
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bool has_write_ref_pre_barrier() { return false; } |
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// Initialization utilities; covered_words is the size of the covered region |
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// in, um, words. |
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inline size_t cards_required(size_t covered_words) { |
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// Add one for a guard card, used to detect errors. |
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const size_t words = align_up(covered_words, card_size_in_words); |
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return words / card_size_in_words + 1; |
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} |
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protected: |
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CardTableModRefBS(MemRegion whole_heap, const BarrierSet::FakeRtti& fake_rtti); |
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~CardTableModRefBS(); |
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// Record a reference update. Note that these versions are precise! |
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// The scanning code has to handle the fact that the write barrier may be |
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// either precise or imprecise. We make non-virtual inline variants of |
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// these functions here for performance. |
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void write_ref_field_work(oop obj, size_t offset, oop newVal); |
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virtual void write_ref_field_work(void* field, oop newVal, bool release); |
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public: |
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bool has_write_ref_array_opt() { return true; } |
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bool has_write_region_opt() { return true; } |
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inline void inline_write_region(MemRegion mr) { |
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dirty_MemRegion(mr); |
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} |
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protected: |
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void write_region_work(MemRegion mr) { |
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inline_write_region(mr); |
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} |
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public: |
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inline void inline_write_ref_array(MemRegion mr) { |
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dirty_MemRegion(mr); |
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} |
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protected: |
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void write_ref_array_work(MemRegion mr) { |
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inline_write_ref_array(mr); |
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} |
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public: |
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bool is_aligned(HeapWord* addr) { |
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return is_card_aligned(addr); |
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} |
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// *** Card-table-barrier-specific things. |
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template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {} |
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template <class T> inline void inline_write_ref_field(T* field, oop newVal, bool release); |
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// These are used by G1, when it uses the card table as a temporary data |
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// structure for card claiming. |
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bool is_card_dirty(size_t card_index) { |
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return _byte_map[card_index] == dirty_card_val(); |
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} |
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void mark_card_dirty(size_t card_index) { |
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_byte_map[card_index] = dirty_card_val(); |
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} |
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bool is_card_clean(size_t card_index) { |
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return _byte_map[card_index] == clean_card_val(); |
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} |
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// Card marking array base (adjusted for heap low boundary) |
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// This would be the 0th element of _byte_map, if the heap started at 0x0. |
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// But since the heap starts at some higher address, this points to somewhere |
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// before the beginning of the actual _byte_map. |
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jbyte* byte_map_base; |
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// Return true if "p" is at the start of a card. |
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bool is_card_aligned(HeapWord* p) { |
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jbyte* pcard = byte_for(p); |
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return (addr_for(pcard) == p); |
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} |
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HeapWord* align_to_card_boundary(HeapWord* p) { |
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jbyte* pcard = byte_for(p + card_size_in_words - 1); |
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return addr_for(pcard); |
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} |
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// The kinds of precision a CardTableModRefBS may offer. |
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enum PrecisionStyle { |
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Precise, |
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ObjHeadPreciseArray |
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}; |
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// Tells what style of precision this card table offers. |
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PrecisionStyle precision() { |
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return ObjHeadPreciseArray; // Only one supported for now. |
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} |
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// ModRefBS functions. |
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virtual void invalidate(MemRegion mr); |
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void clear(MemRegion mr); |
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void dirty(MemRegion mr); |
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// *** Card-table-RemSet-specific things. |
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static uintx ct_max_alignment_constraint(); |
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// Apply closure "cl" to the dirty cards containing some part of |
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// MemRegion "mr". |
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void dirty_card_iterate(MemRegion mr, MemRegionClosure* cl); |
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// Return the MemRegion corresponding to the first maximal run |
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// of dirty cards lying completely within MemRegion mr. |
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// If reset is "true", then sets those card table entries to the given |
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// value. |
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MemRegion dirty_card_range_after_reset(MemRegion mr, bool reset, |
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int reset_val); |
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// Provide read-only access to the card table array. |
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const jbyte* byte_for_const(const void* p) const { |
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return byte_for(p); |
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} |
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const jbyte* byte_after_const(const void* p) const { |
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return byte_after(p); |
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} |
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// Mapping from card marking array entry to address of first word |
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HeapWord* addr_for(const jbyte* p) const { |
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assert(p >= _byte_map && p < _byte_map + _byte_map_size, |
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"out of bounds access to card marking array. p: " PTR_FORMAT |
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" _byte_map: " PTR_FORMAT " _byte_map + _byte_map_size: " PTR_FORMAT, |
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p2i(p), p2i(_byte_map), p2i(_byte_map + _byte_map_size)); |
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size_t delta = pointer_delta(p, byte_map_base, sizeof(jbyte)); |
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HeapWord* result = (HeapWord*) (delta << card_shift); |
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assert(_whole_heap.contains(result), |
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"Returning result = " PTR_FORMAT " out of bounds of " |
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" card marking array's _whole_heap = [" PTR_FORMAT "," PTR_FORMAT ")", |
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p2i(result), p2i(_whole_heap.start()), p2i(_whole_heap.end())); |
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return result; |
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} |
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// Mapping from address to card marking array index. |
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size_t index_for(void* p) { |
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assert(_whole_heap.contains(p), |
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"Attempt to access p = " PTR_FORMAT " out of bounds of " |
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" card marking array's _whole_heap = [" PTR_FORMAT "," PTR_FORMAT ")", |
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p2i(p), p2i(_whole_heap.start()), p2i(_whole_heap.end())); |
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return byte_for(p) - _byte_map; |
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} |
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const jbyte* byte_for_index(const size_t card_index) const { |
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return _byte_map + card_index; |
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} |
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// Print a description of the memory for the barrier set |
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virtual void print_on(outputStream* st) const; |
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void verify(); |
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void verify_guard(); |
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// val_equals -> it will check that all cards covered by mr equal val |
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// !val_equals -> it will check that all cards covered by mr do not equal val |
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void verify_region(MemRegion mr, jbyte val, bool val_equals) PRODUCT_RETURN; |
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void verify_not_dirty_region(MemRegion mr) PRODUCT_RETURN; |
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void verify_dirty_region(MemRegion mr) PRODUCT_RETURN; |
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}; |
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template<> |
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struct BarrierSet::GetName<CardTableModRefBS> { |
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static const BarrierSet::Name value = BarrierSet::CardTableModRef; |
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}; |
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#endif // SHARE_VM_GC_SHARED_CARDTABLEMODREFBS_HPP |