src/hotspot/share/gc/shared/space.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 46810 hotspot/src/share/vm/gc/shared/space.hpp@7dad333205cd
child 49164 7e958a8ebcd3
permissions -rw-r--r--
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/*
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 * Copyright (c) 1997, 2017, 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_SPACE_HPP
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#define SHARE_VM_GC_SHARED_SPACE_HPP
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#include "gc/shared/blockOffsetTable.hpp"
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#include "gc/shared/cardTableModRefBS.hpp"
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#include "gc/shared/workgroup.hpp"
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#include "memory/allocation.hpp"
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#include "memory/iterator.hpp"
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#include "memory/memRegion.hpp"
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#include "oops/markOop.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "utilities/align.hpp"
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#include "utilities/macros.hpp"
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// A space is an abstraction for the "storage units" backing
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// up the generation abstraction. It includes specific
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// implementations for keeping track of free and used space,
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// for iterating over objects and free blocks, etc.
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// Forward decls.
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class Space;
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class BlockOffsetArray;
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class BlockOffsetArrayContigSpace;
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class Generation;
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class CompactibleSpace;
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class BlockOffsetTable;
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class CardTableRS;
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class DirtyCardToOopClosure;
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// A Space describes a heap area. Class Space is an abstract
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// base class.
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//
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// Space supports allocation, size computation and GC support is provided.
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//
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// Invariant: bottom() and end() are on page_size boundaries and
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// bottom() <= top() <= end()
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// top() is inclusive and end() is exclusive.
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class Space: public CHeapObj<mtGC> {
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  friend class VMStructs;
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 protected:
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  HeapWord* _bottom;
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  HeapWord* _end;
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  // Used in support of save_marks()
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  HeapWord* _saved_mark_word;
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  // A sequential tasks done structure. This supports
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  // parallel GC, where we have threads dynamically
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  // claiming sub-tasks from a larger parallel task.
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  SequentialSubTasksDone _par_seq_tasks;
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  Space():
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    _bottom(NULL), _end(NULL) { }
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 public:
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  // Accessors
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  HeapWord* bottom() const         { return _bottom; }
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  HeapWord* end() const            { return _end;    }
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  virtual void set_bottom(HeapWord* value) { _bottom = value; }
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  virtual void set_end(HeapWord* value)    { _end = value; }
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  virtual HeapWord* saved_mark_word() const  { return _saved_mark_word; }
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  void set_saved_mark_word(HeapWord* p) { _saved_mark_word = p; }
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  // Returns true if this object has been allocated since a
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  // generation's "save_marks" call.
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  virtual bool obj_allocated_since_save_marks(const oop obj) const {
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    return (HeapWord*)obj >= saved_mark_word();
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  }
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  virtual MemRegionClosure* preconsumptionDirtyCardClosure() const {
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    return NULL;
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  }
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  // Returns a subregion of the space containing only the allocated objects in
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  // the space.
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  virtual MemRegion used_region() const = 0;
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  // Returns a region that is guaranteed to contain (at least) all objects
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  // allocated at the time of the last call to "save_marks".  If the space
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  // initializes its DirtyCardToOopClosure's specifying the "contig" option
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  // (that is, if the space is contiguous), then this region must contain only
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  // such objects: the memregion will be from the bottom of the region to the
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  // saved mark.  Otherwise, the "obj_allocated_since_save_marks" method of
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  // the space must distinguish between objects in the region allocated before
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  // and after the call to save marks.
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  MemRegion used_region_at_save_marks() const {
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    return MemRegion(bottom(), saved_mark_word());
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  }
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  // Initialization.
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  // "initialize" should be called once on a space, before it is used for
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  // any purpose.  The "mr" arguments gives the bounds of the space, and
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  // the "clear_space" argument should be true unless the memory in "mr" is
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  // known to be zeroed.
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  virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space);
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  // The "clear" method must be called on a region that may have
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  // had allocation performed in it, but is now to be considered empty.
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  virtual void clear(bool mangle_space);
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  // For detecting GC bugs.  Should only be called at GC boundaries, since
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  // some unused space may be used as scratch space during GC's.
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  // We also call this when expanding a space to satisfy an allocation
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  // request. See bug #4668531
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  virtual void mangle_unused_area() = 0;
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  virtual void mangle_unused_area_complete() = 0;
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  // Testers
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  bool is_empty() const              { return used() == 0; }
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  bool not_empty() const             { return used() > 0; }
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  // Returns true iff the given the space contains the
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  // given address as part of an allocated object. For
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  // certain kinds of spaces, this might be a potentially
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  // expensive operation. To prevent performance problems
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  // on account of its inadvertent use in product jvm's,
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  // we restrict its use to assertion checks only.
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  bool is_in(const void* p) const {
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    return used_region().contains(p);
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  }
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  // Returns true iff the given reserved memory of the space contains the
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  // given address.
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  bool is_in_reserved(const void* p) const { return _bottom <= p && p < _end; }
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  // Returns true iff the given block is not allocated.
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  virtual bool is_free_block(const HeapWord* p) const = 0;
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  // Test whether p is double-aligned
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  static bool is_aligned(void* p) {
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    return ::is_aligned(p, sizeof(double));
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  }
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  // Size computations.  Sizes are in bytes.
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  size_t capacity()     const { return byte_size(bottom(), end()); }
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  virtual size_t used() const = 0;
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  virtual size_t free() const = 0;
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  // Iterate over all the ref-containing fields of all objects in the
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  // space, calling "cl.do_oop" on each.  Fields in objects allocated by
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  // applications of the closure are not included in the iteration.
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  virtual void oop_iterate(ExtendedOopClosure* cl);
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  // Iterate over all objects in the space, calling "cl.do_object" on
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  // each.  Objects allocated by applications of the closure are not
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  // included in the iteration.
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  virtual void object_iterate(ObjectClosure* blk) = 0;
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  // Similar to object_iterate() except only iterates over
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  // objects whose internal references point to objects in the space.
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  virtual void safe_object_iterate(ObjectClosure* blk) = 0;
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  // Create and return a new dirty card to oop closure. Can be
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  // overridden to return the appropriate type of closure
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  // depending on the type of space in which the closure will
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  // operate. ResourceArea allocated.
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  virtual DirtyCardToOopClosure* new_dcto_cl(ExtendedOopClosure* cl,
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                                             CardTableModRefBS::PrecisionStyle precision,
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                                             HeapWord* boundary,
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                                             bool parallel);
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  // If "p" is in the space, returns the address of the start of the
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  // "block" that contains "p".  We say "block" instead of "object" since
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  // some heaps may not pack objects densely; a chunk may either be an
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  // object or a non-object.  If "p" is not in the space, return NULL.
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  virtual HeapWord* block_start_const(const void* p) const = 0;
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  // The non-const version may have benevolent side effects on the data
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  // structure supporting these calls, possibly speeding up future calls.
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  // The default implementation, however, is simply to call the const
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  // version.
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  virtual HeapWord* block_start(const void* p);
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  // Requires "addr" to be the start of a chunk, and returns its size.
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  // "addr + size" is required to be the start of a new chunk, or the end
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  // of the active area of the heap.
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  virtual size_t block_size(const HeapWord* addr) const = 0;
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  // Requires "addr" to be the start of a block, and returns "TRUE" iff
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  // the block is an object.
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  virtual bool block_is_obj(const HeapWord* addr) const = 0;
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  // Requires "addr" to be the start of a block, and returns "TRUE" iff
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  // the block is an object and the object is alive.
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  virtual bool obj_is_alive(const HeapWord* addr) const;
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  // Allocation (return NULL if full).  Assumes the caller has established
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  // mutually exclusive access to the space.
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  virtual HeapWord* allocate(size_t word_size) = 0;
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  // Allocation (return NULL if full).  Enforces mutual exclusion internally.
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  virtual HeapWord* par_allocate(size_t word_size) = 0;
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  // Mark-sweep-compact support: all spaces can update pointers to objects
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  // moving as a part of compaction.
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  virtual void adjust_pointers() = 0;
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  virtual void print() const;
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  virtual void print_on(outputStream* st) const;
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  virtual void print_short() const;
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  virtual void print_short_on(outputStream* st) const;
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  // Accessor for parallel sequential tasks.
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  SequentialSubTasksDone* par_seq_tasks() { return &_par_seq_tasks; }
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  // IF "this" is a ContiguousSpace, return it, else return NULL.
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  virtual ContiguousSpace* toContiguousSpace() {
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    return NULL;
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  }
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  // Debugging
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  virtual void verify() const = 0;
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};
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// A MemRegionClosure (ResourceObj) whose "do_MemRegion" function applies an
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// OopClosure to (the addresses of) all the ref-containing fields that could
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// be modified by virtue of the given MemRegion being dirty. (Note that
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// because of the imprecise nature of the write barrier, this may iterate
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// over oops beyond the region.)
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// This base type for dirty card to oop closures handles memory regions
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// in non-contiguous spaces with no boundaries, and should be sub-classed
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// to support other space types. See ContiguousDCTOC for a sub-class
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// that works with ContiguousSpaces.
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class DirtyCardToOopClosure: public MemRegionClosureRO {
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protected:
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  ExtendedOopClosure* _cl;
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  Space* _sp;
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  CardTableModRefBS::PrecisionStyle _precision;
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  HeapWord* _boundary;          // If non-NULL, process only non-NULL oops
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                                // pointing below boundary.
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  HeapWord* _min_done;          // ObjHeadPreciseArray precision requires
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                                // a downwards traversal; this is the
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                                // lowest location already done (or,
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                                // alternatively, the lowest address that
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                                // shouldn't be done again.  NULL means infinity.)
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  NOT_PRODUCT(HeapWord* _last_bottom;)
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  NOT_PRODUCT(HeapWord* _last_explicit_min_done;)
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  // Get the actual top of the area on which the closure will
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  // operate, given where the top is assumed to be (the end of the
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  // memory region passed to do_MemRegion) and where the object
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  // at the top is assumed to start. For example, an object may
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  // start at the top but actually extend past the assumed top,
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  // in which case the top becomes the end of the object.
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  virtual HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj);
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  // Walk the given memory region from bottom to (actual) top
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  // looking for objects and applying the oop closure (_cl) to
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  // them. The base implementation of this treats the area as
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  // blocks, where a block may or may not be an object. Sub-
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  // classes should override this to provide more accurate
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  // or possibly more efficient walking.
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  virtual void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top);
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public:
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  DirtyCardToOopClosure(Space* sp, ExtendedOopClosure* cl,
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                        CardTableModRefBS::PrecisionStyle precision,
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                        HeapWord* boundary) :
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    _sp(sp), _cl(cl), _precision(precision), _boundary(boundary),
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    _min_done(NULL) {
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    NOT_PRODUCT(_last_bottom = NULL);
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    NOT_PRODUCT(_last_explicit_min_done = NULL);
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  }
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  void do_MemRegion(MemRegion mr);
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  void set_min_done(HeapWord* min_done) {
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    _min_done = min_done;
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    NOT_PRODUCT(_last_explicit_min_done = _min_done);
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  }
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#ifndef PRODUCT
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  void set_last_bottom(HeapWord* last_bottom) {
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    _last_bottom = last_bottom;
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  }
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#endif
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};
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// A structure to represent a point at which objects are being copied
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// during compaction.
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class CompactPoint : public StackObj {
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public:
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  Generation* gen;
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  CompactibleSpace* space;
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  HeapWord* threshold;
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  CompactPoint(Generation* g = NULL) :
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    gen(g), space(NULL), threshold(0) {}
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};
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// A space that supports compaction operations.  This is usually, but not
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// necessarily, a space that is normally contiguous.  But, for example, a
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// free-list-based space whose normal collection is a mark-sweep without
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// compaction could still support compaction in full GC's.
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//
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// The compaction operations are implemented by the
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// scan_and_{adjust_pointers,compact,forward} function templates.
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// The following are, non-virtual, auxiliary functions used by these function templates:
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// - scan_limit()
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// - scanned_block_is_obj()
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// - scanned_block_size()
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// - adjust_obj_size()
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// - obj_size()
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// These functions are to be used exclusively by the scan_and_* function templates,
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// and must be defined for all (non-abstract) subclasses of CompactibleSpace.
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//
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// NOTE: Any subclasses to CompactibleSpace wanting to change/define the behavior
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// in any of the auxiliary functions must also override the corresponding
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// prepare_for_compaction/adjust_pointers/compact functions using them.
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// If not, such changes will not be used or have no effect on the compaction operations.
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//
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// This translates to the following dependencies:
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// Overrides/definitions of
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//  - scan_limit
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//  - scanned_block_is_obj
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//  - scanned_block_size
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// require override/definition of prepare_for_compaction().
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// Similar dependencies exist between
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//  - adjust_obj_size  and adjust_pointers()
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//  - obj_size         and compact().
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//
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// Additionally, this also means that changes to block_size() or block_is_obj() that
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// should be effective during the compaction operations must provide a corresponding
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// definition of scanned_block_size/scanned_block_is_obj respectively.
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class CompactibleSpace: public Space {
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  friend class VMStructs;
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  friend class CompactibleFreeListSpace;
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private:
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  HeapWord* _compaction_top;
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  CompactibleSpace* _next_compaction_space;
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  // Auxiliary functions for scan_and_{forward,adjust_pointers,compact} support.
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  inline size_t adjust_obj_size(size_t size) const {
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    return size;
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  }
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  inline size_t obj_size(const HeapWord* addr) const;
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  template <class SpaceType>
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  static inline void verify_up_to_first_dead(SpaceType* space) NOT_DEBUG_RETURN;
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  template <class SpaceType>
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  static inline void clear_empty_region(SpaceType* space);
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public:
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  CompactibleSpace() :
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   _compaction_top(NULL), _next_compaction_space(NULL) {}
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  virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space);
1388
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  virtual void clear(bool mangle_space);
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  // Used temporarily during a compaction phase to hold the value
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  // top should have when compaction is complete.
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  HeapWord* compaction_top() const { return _compaction_top;    }
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   382
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  void set_compaction_top(HeapWord* value) {
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   384
    assert(value == NULL || (value >= bottom() && value <= end()),
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   385
      "should point inside space");
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   386
    _compaction_top = value;
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   387
  }
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   388
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   389
  // Perform operations on the space needed after a compaction
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   390
  // has been performed.
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   391
  virtual void reset_after_compaction() = 0;
1
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   392
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  // Returns the next space (in the current generation) to be compacted in
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   394
  // the global compaction order.  Also is used to select the next
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   395
  // space into which to compact.
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   396
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   397
  virtual CompactibleSpace* next_compaction_space() const {
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   398
    return _next_compaction_space;
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   399
  }
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   400
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   401
  void set_next_compaction_space(CompactibleSpace* csp) {
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   402
    _next_compaction_space = csp;
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   403
  }
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   404
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   405
  // MarkSweep support phase2
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   406
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   407
  // Start the process of compaction of the current space: compute
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   408
  // post-compaction addresses, and insert forwarding pointers.  The fields
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   409
  // "cp->gen" and "cp->compaction_space" are the generation and space into
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   410
  // which we are currently compacting.  This call updates "cp" as necessary,
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   411
  // and leaves the "compaction_top" of the final value of
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   412
  // "cp->compaction_space" up-to-date.  Offset tables may be updated in
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   413
  // this phase as if the final copy had occurred; if so, "cp->threshold"
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   414
  // indicates when the next such action should be taken.
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   415
  virtual void prepare_for_compaction(CompactPoint* cp) = 0;
1
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   416
  // MarkSweep support phase3
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   417
  virtual void adjust_pointers();
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   418
  // MarkSweep support phase4
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   419
  virtual void compact();
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   420
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  // The maximum percentage of objects that can be dead in the compacted
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  // live part of a compacted space ("deadwood" support.)
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13878a2edfef 6765804: GC "dead ratios" should be unsigned
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   423
  virtual size_t allowed_dead_ratio() const { return 0; };
1
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   424
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   425
  // Some contiguous spaces may maintain some data structures that should
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   426
  // be updated whenever an allocation crosses a boundary.  This function
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   427
  // returns the first such boundary.
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   428
  // (The default implementation returns the end of the space, so the
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   429
  // boundary is never crossed.)
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   430
  virtual HeapWord* initialize_threshold() { return end(); }
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   431
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   432
  // "q" is an object of the given "size" that should be forwarded;
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   433
  // "cp" names the generation ("gen") and containing "this" (which must
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   434
  // also equal "cp->space").  "compact_top" is where in "this" the
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parents:
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   435
  // next object should be forwarded to.  If there is room in "this" for
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   436
  // the object, insert an appropriate forwarding pointer in "q".
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   437
  // If not, go to the next compaction space (there must
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   438
  // be one, since compaction must succeed -- we go to the first space of
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   439
  // the previous generation if necessary, updating "cp"), reset compact_top
489c9b5090e2 Initial load
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   440
  // and then forward.  In either case, returns the new value of "compact_top".
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9bf46d16dcc6 8025856: Fix typos in the GC code
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parents: 22234
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   441
  // If the forwarding crosses "cp->threshold", invokes the "cross_threshold"
1
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  // function of the then-current compaction space, and updates "cp->threshold
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   443
  // accordingly".
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   444
  virtual HeapWord* forward(oop q, size_t size, CompactPoint* cp,
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   445
                    HeapWord* compact_top);
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   446
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9bf46d16dcc6 8025856: Fix typos in the GC code
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diff changeset
   447
  // Return a size with adjustments as required of the space.
1
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   448
  virtual size_t adjust_object_size_v(size_t size) const { return size; }
489c9b5090e2 Initial load
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   449
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jiangli
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   450
  void set_first_dead(HeapWord* value) { _first_dead = value; }
7dad333205cd 8179302: Pre-resolve constant pool string entries and cache resolved_reference arrays in CDS archive.
jiangli
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   451
  void set_end_of_live(HeapWord* value) { _end_of_live = value; }
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jiangli
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   452
1
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   453
protected:
489c9b5090e2 Initial load
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   454
  // Used during compaction.
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   455
  HeapWord* _first_dead;
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parents:
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   456
  HeapWord* _end_of_live;
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   457
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   458
  // Minimum size of a free block.
23537
3de0cad00ae1 8038405: Clean up some virtual fucntions in Space class hierarchy
mgerdin
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diff changeset
   459
  virtual size_t minimum_free_block_size() const { return 0; }
1
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   460
489c9b5090e2 Initial load
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   461
  // This the function is invoked when an allocation of an object covering
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   462
  // "start" to "end occurs crosses the threshold; returns the next
489c9b5090e2 Initial load
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   463
  // threshold.  (The default implementation does nothing.)
489c9b5090e2 Initial load
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   464
  virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* the_end) {
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   465
    return end();
489c9b5090e2 Initial load
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   466
  }
489c9b5090e2 Initial load
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   467
27624
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diff changeset
   468
  // Below are template functions for scan_and_* algorithms (avoiding virtual calls).
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   469
  // The space argument should be a subclass of CompactibleSpace, implementing
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   470
  // scan_limit(), scanned_block_is_obj(), and scanned_block_size(),
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   471
  // and possibly also overriding obj_size(), and adjust_obj_size().
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   472
  // These functions should avoid virtual calls whenever possible.
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   473
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   474
  // Frequently calls adjust_obj_size().
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mlarsson
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diff changeset
   475
  template <class SpaceType>
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mlarsson
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diff changeset
   476
  static inline void scan_and_adjust_pointers(SpaceType* space);
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   477
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   478
  // Frequently calls obj_size().
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   479
  template <class SpaceType>
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   480
  static inline void scan_and_compact(SpaceType* space);
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   481
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   482
  // Frequently calls scanned_block_is_obj() and scanned_block_size().
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   483
  // Requires the scan_limit() function.
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   484
  template <class SpaceType>
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
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diff changeset
   485
  static inline void scan_and_forward(SpaceType* space, CompactPoint* cp);
1
489c9b5090e2 Initial load
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parents:
diff changeset
   486
};
489c9b5090e2 Initial load
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parents:
diff changeset
   487
971
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   488
class GenSpaceMangler;
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   489
1
489c9b5090e2 Initial load
duke
parents:
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   490
// A space in which the free area is contiguous.  It therefore supports
489c9b5090e2 Initial load
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parents:
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   491
// faster allocation, and compaction.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   492
class ContiguousSpace: public CompactibleSpace {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   493
  friend class VMStructs;
27624
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   494
  // Allow scan_and_forward function to call (private) overrides for auxiliary functions on this class
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   495
  template <typename SpaceType>
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   496
  friend void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* cp);
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   497
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   498
 private:
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   499
  // Auxiliary functions for scan_and_forward support.
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   500
  // See comments for CompactibleSpace for more information.
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   501
  inline HeapWord* scan_limit() const {
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   502
    return top();
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   503
  }
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   504
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   505
  inline bool scanned_block_is_obj(const HeapWord* addr) const {
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   506
    return true; // Always true, since scan_limit is top
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   507
  }
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   508
35862
411842d0c882 8146395: Add inline qualifier in oop.hpp and fix inlining in gc files
goetz
parents: 35492
diff changeset
   509
  inline size_t scanned_block_size(const HeapWord* addr) const;
27624
fe43edc5046d 8043243: convert SCAN_AND_FORWARD, SCAN_AND_ADJUST_POINTERS, SCAN_AND_COMPACT macros to methods
mlarsson
parents: 26839
diff changeset
   510
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   511
 protected:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   512
  HeapWord* _top;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   513
  HeapWord* _concurrent_iteration_safe_limit;
971
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   514
  // A helper for mangling the unused area of the space in debug builds.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   515
  GenSpaceMangler* _mangler;
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   516
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   517
  GenSpaceMangler* mangler() { return _mangler; }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   518
489c9b5090e2 Initial load
duke
parents:
diff changeset
   519
  // Allocation helpers (return NULL if full).
27625
07829380b8cd 8061308: Remove iCMS
brutisso
parents: 27624
diff changeset
   520
  inline HeapWord* allocate_impl(size_t word_size);
07829380b8cd 8061308: Remove iCMS
brutisso
parents: 27624
diff changeset
   521
  inline HeapWord* par_allocate_impl(size_t word_size);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   522
489c9b5090e2 Initial load
duke
parents:
diff changeset
   523
 public:
971
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   524
  ContiguousSpace();
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   525
  ~ContiguousSpace();
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   526
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   527
  virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space);
1388
tonyp
parents: 1379 977
diff changeset
   528
  virtual void clear(bool mangle_space);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   529
489c9b5090e2 Initial load
duke
parents:
diff changeset
   530
  // Accessors
489c9b5090e2 Initial load
duke
parents:
diff changeset
   531
  HeapWord* top() const            { return _top;    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   532
  void set_top(HeapWord* value)    { _top = value; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   533
23537
3de0cad00ae1 8038405: Clean up some virtual fucntions in Space class hierarchy
mgerdin
parents: 23536
diff changeset
   534
  void set_saved_mark()            { _saved_mark_word = top();    }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents: 360
diff changeset
   535
  void reset_saved_mark()          { _saved_mark_word = bottom(); }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   536
489c9b5090e2 Initial load
duke
parents:
diff changeset
   537
  bool saved_mark_at_top() const { return saved_mark_word() == top(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   538
971
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   539
  // In debug mode mangle (write it with a particular bit
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   540
  // pattern) the unused part of a space.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   541
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   542
  // Used to save the an address in a space for later use during mangling.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   543
  void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN;
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   544
  // Used to save the space's current top for later use during mangling.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   545
  void set_top_for_allocations() PRODUCT_RETURN;
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   546
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   547
  // Mangle regions in the space from the current top up to the
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   548
  // previously mangled part of the space.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   549
  void mangle_unused_area() PRODUCT_RETURN;
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   550
  // Mangle [top, end)
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   551
  void mangle_unused_area_complete() PRODUCT_RETURN;
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   552
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   553
  // Do some sparse checking on the area that should have been mangled.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   554
  void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   555
  // Check the complete area that should have been mangled.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   556
  // This code may be NULL depending on the macro DEBUG_MANGLING.
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   557
  void check_mangled_unused_area_complete() PRODUCT_RETURN;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   558
489c9b5090e2 Initial load
duke
parents:
diff changeset
   559
  // Size computations: sizes in bytes.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   560
  size_t capacity() const        { return byte_size(bottom(), end()); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   561
  size_t used() const            { return byte_size(bottom(), top()); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   562
  size_t free() const            { return byte_size(top(),    end()); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   563
489c9b5090e2 Initial load
duke
parents:
diff changeset
   564
  virtual bool is_free_block(const HeapWord* p) const;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   565
489c9b5090e2 Initial load
duke
parents:
diff changeset
   566
  // In a contiguous space we have a more obvious bound on what parts
489c9b5090e2 Initial load
duke
parents:
diff changeset
   567
  // contain objects.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   568
  MemRegion used_region() const { return MemRegion(bottom(), top()); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   569
489c9b5090e2 Initial load
duke
parents:
diff changeset
   570
  // Allocation (return NULL if full)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   571
  virtual HeapWord* allocate(size_t word_size);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   572
  virtual HeapWord* par_allocate(size_t word_size);
25905
04a3d83cc752 8031323: Optionally align objects copied to survivor spaces
jmasa
parents: 25730
diff changeset
   573
  HeapWord* allocate_aligned(size_t word_size);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   574
489c9b5090e2 Initial load
duke
parents:
diff changeset
   575
  // Iteration
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   576
  void oop_iterate(ExtendedOopClosure* cl);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   577
  void object_iterate(ObjectClosure* blk);
1893
c82e388e17c5 6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents: 1557
diff changeset
   578
  // For contiguous spaces this method will iterate safely over objects
c82e388e17c5 6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents: 1557
diff changeset
   579
  // in the space (i.e., between bottom and top) when at a safepoint.
c82e388e17c5 6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents: 1557
diff changeset
   580
  void safe_object_iterate(ObjectClosure* blk);
23536
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   581
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   582
  // Iterate over as many initialized objects in the space as possible,
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   583
  // calling "cl.do_object_careful" on each. Return NULL if all objects
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   584
  // in the space (at the start of the iteration) were iterated over.
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   585
  // Return an address indicating the extent of the iteration in the
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   586
  // event that the iteration had to return because of finding an
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   587
  // uninitialized object in the space, or if the closure "cl"
5ad11152daa9 8038412: Move object_iterate_careful down from Space to ContigousSpace and CFLSpace
mgerdin
parents: 23535
diff changeset
   588
  // signaled early termination.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   589
  HeapWord* object_iterate_careful(ObjectClosureCareful* cl);
12597
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   590
  HeapWord* concurrent_iteration_safe_limit() {
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   591
    assert(_concurrent_iteration_safe_limit <= top(),
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   592
           "_concurrent_iteration_safe_limit update missed");
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   593
    return _concurrent_iteration_safe_limit;
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   594
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   595
  // changes the safe limit, all objects from bottom() to the new
489c9b5090e2 Initial load
duke
parents:
diff changeset
   596
  // limit should be properly initialized
12597
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   597
  void set_concurrent_iteration_safe_limit(HeapWord* new_limit) {
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   598
    assert(new_limit <= top(), "uninitialized objects in the safe range");
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   599
    _concurrent_iteration_safe_limit = new_limit;
904566185bdf 7167437: Can't build on linux without precompiled headers
stefank
parents: 12379
diff changeset
   600
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   601
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   602
15482
470d0b0c09f1 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 15088
diff changeset
   603
#if INCLUDE_ALL_GCS
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   604
  // In support of parallel oop_iterate.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   605
  #define ContigSpace_PAR_OOP_ITERATE_DECL(OopClosureType, nv_suffix)  \
489c9b5090e2 Initial load
duke
parents:
diff changeset
   606
    void par_oop_iterate(MemRegion mr, OopClosureType* blk);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   607
489c9b5090e2 Initial load
duke
parents:
diff changeset
   608
    ALL_PAR_OOP_ITERATE_CLOSURES(ContigSpace_PAR_OOP_ITERATE_DECL)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   609
  #undef ContigSpace_PAR_OOP_ITERATE_DECL
15482
470d0b0c09f1 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 15088
diff changeset
   610
#endif // INCLUDE_ALL_GCS
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   611
489c9b5090e2 Initial load
duke
parents:
diff changeset
   612
  // Compaction support
489c9b5090e2 Initial load
duke
parents:
diff changeset
   613
  virtual void reset_after_compaction() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   614
    assert(compaction_top() >= bottom() && compaction_top() <= end(), "should point inside space");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   615
    set_top(compaction_top());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   616
    // set new iteration safe limit
489c9b5090e2 Initial load
duke
parents:
diff changeset
   617
    set_concurrent_iteration_safe_limit(compaction_top());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   618
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   619
489c9b5090e2 Initial load
duke
parents:
diff changeset
   620
  // Override.
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   621
  DirtyCardToOopClosure* new_dcto_cl(ExtendedOopClosure* cl,
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   622
                                     CardTableModRefBS::PrecisionStyle precision,
30870
3050fdcdc60b 8080112: Replace and remove the last usages of CollectedHeap::n_par_threads()
stefank
parents: 30764
diff changeset
   623
                                     HeapWord* boundary,
3050fdcdc60b 8080112: Replace and remove the last usages of CollectedHeap::n_par_threads()
stefank
parents: 30764
diff changeset
   624
                                     bool parallel);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   625
489c9b5090e2 Initial load
duke
parents:
diff changeset
   626
  // Apply "blk->do_oop" to the addresses of all reference fields in objects
489c9b5090e2 Initial load
duke
parents:
diff changeset
   627
  // starting with the _saved_mark_word, which was noted during a generation's
489c9b5090e2 Initial load
duke
parents:
diff changeset
   628
  // save_marks and is required to denote the head of an object.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   629
  // Fields in objects allocated by applications of the closure
489c9b5090e2 Initial load
duke
parents:
diff changeset
   630
  // *are* included in the iteration.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   631
  // Updates _saved_mark_word to point to just after the last object
489c9b5090e2 Initial load
duke
parents:
diff changeset
   632
  // iterated over.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   633
#define ContigSpace_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix)  \
489c9b5090e2 Initial load
duke
parents:
diff changeset
   634
  void oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   635
489c9b5090e2 Initial load
duke
parents:
diff changeset
   636
  ALL_SINCE_SAVE_MARKS_CLOSURES(ContigSpace_OOP_SINCE_SAVE_MARKS_DECL)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   637
#undef ContigSpace_OOP_SINCE_SAVE_MARKS_DECL
489c9b5090e2 Initial load
duke
parents:
diff changeset
   638
489c9b5090e2 Initial load
duke
parents:
diff changeset
   639
  // Same as object_iterate, but starting from "mark", which is required
489c9b5090e2 Initial load
duke
parents:
diff changeset
   640
  // to denote the start of an object.  Objects allocated by
489c9b5090e2 Initial load
duke
parents:
diff changeset
   641
  // applications of the closure *are* included in the iteration.
33205
bc9fec5e7656 8139506: Remove the WaterMark class
david
parents: 30870
diff changeset
   642
  virtual void object_iterate_from(HeapWord* mark, ObjectClosure* blk);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   643
489c9b5090e2 Initial load
duke
parents:
diff changeset
   644
  // Very inefficient implementation.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents: 360
diff changeset
   645
  virtual HeapWord* block_start_const(const void* p) const;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   646
  size_t block_size(const HeapWord* p) const;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   647
  // If a block is in the allocated area, it is an object.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   648
  bool block_is_obj(const HeapWord* p) const { return p < top(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   649
489c9b5090e2 Initial load
duke
parents:
diff changeset
   650
  // Addresses for inlined allocation
489c9b5090e2 Initial load
duke
parents:
diff changeset
   651
  HeapWord** top_addr() { return &_top; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   652
  HeapWord** end_addr() { return &_end; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   653
489c9b5090e2 Initial load
duke
parents:
diff changeset
   654
  // Overrides for more efficient compaction support.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   655
  void prepare_for_compaction(CompactPoint* cp);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   656
489c9b5090e2 Initial load
duke
parents:
diff changeset
   657
  virtual void print_on(outputStream* st) const;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   658
489c9b5090e2 Initial load
duke
parents:
diff changeset
   659
  // Checked dynamic downcasts.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   660
  virtual ContiguousSpace* toContiguousSpace() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   661
    return this;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   662
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   663
489c9b5090e2 Initial load
duke
parents:
diff changeset
   664
  // Debugging
12379
2cf45b79ce3a 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 11247
diff changeset
   665
  virtual void verify() const;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   666
489c9b5090e2 Initial load
duke
parents:
diff changeset
   667
  // Used to increase collection frequency.  "factor" of 0 means entire
489c9b5090e2 Initial load
duke
parents:
diff changeset
   668
  // space.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   669
  void allocate_temporary_filler(int factor);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   670
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   671
489c9b5090e2 Initial load
duke
parents:
diff changeset
   672
489c9b5090e2 Initial load
duke
parents:
diff changeset
   673
// A dirty card to oop closure that does filtering.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   674
// It knows how to filter out objects that are outside of the _boundary.
35492
c8c0273e6b91 8146690: Make all classes in GC follow the naming convention.
david
parents: 35061
diff changeset
   675
class FilteringDCTOC : public DirtyCardToOopClosure {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   676
protected:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   677
  // Override.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   678
  void walk_mem_region(MemRegion mr,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   679
                       HeapWord* bottom, HeapWord* top);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   680
489c9b5090e2 Initial load
duke
parents:
diff changeset
   681
  // Walk the given memory region, from bottom to top, applying
489c9b5090e2 Initial load
duke
parents:
diff changeset
   682
  // the given oop closure to (possibly) all objects found. The
489c9b5090e2 Initial load
duke
parents:
diff changeset
   683
  // given oop closure may or may not be the same as the oop
489c9b5090e2 Initial load
duke
parents:
diff changeset
   684
  // closure with which this closure was created, as it may
489c9b5090e2 Initial load
duke
parents:
diff changeset
   685
  // be a filtering closure which makes use of the _boundary.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   686
  // We offer two signatures, so the FilteringClosure static type is
489c9b5090e2 Initial load
duke
parents:
diff changeset
   687
  // apparent.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   688
  virtual void walk_mem_region_with_cl(MemRegion mr,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   689
                                       HeapWord* bottom, HeapWord* top,
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   690
                                       ExtendedOopClosure* cl) = 0;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   691
  virtual void walk_mem_region_with_cl(MemRegion mr,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   692
                                       HeapWord* bottom, HeapWord* top,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   693
                                       FilteringClosure* cl) = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   694
489c9b5090e2 Initial load
duke
parents:
diff changeset
   695
public:
35492
c8c0273e6b91 8146690: Make all classes in GC follow the naming convention.
david
parents: 35061
diff changeset
   696
  FilteringDCTOC(Space* sp, ExtendedOopClosure* cl,
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   697
                  CardTableModRefBS::PrecisionStyle precision,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   698
                  HeapWord* boundary) :
489c9b5090e2 Initial load
duke
parents:
diff changeset
   699
    DirtyCardToOopClosure(sp, cl, precision, boundary) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   700
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   701
489c9b5090e2 Initial load
duke
parents:
diff changeset
   702
// A dirty card to oop closure for contiguous spaces
489c9b5090e2 Initial load
duke
parents:
diff changeset
   703
// (ContiguousSpace and sub-classes).
489c9b5090e2 Initial load
duke
parents:
diff changeset
   704
// It is a FilteringClosure, as defined above, and it knows:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   705
//
489c9b5090e2 Initial load
duke
parents:
diff changeset
   706
// 1. That the actual top of any area in a memory region
489c9b5090e2 Initial load
duke
parents:
diff changeset
   707
//    contained by the space is bounded by the end of the contiguous
489c9b5090e2 Initial load
duke
parents:
diff changeset
   708
//    region of the space.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   709
// 2. That the space is really made up of objects and not just
489c9b5090e2 Initial load
duke
parents:
diff changeset
   710
//    blocks.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   711
35492
c8c0273e6b91 8146690: Make all classes in GC follow the naming convention.
david
parents: 35061
diff changeset
   712
class ContiguousSpaceDCTOC : public FilteringDCTOC {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   713
protected:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   714
  // Overrides.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   715
  HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   716
489c9b5090e2 Initial load
duke
parents:
diff changeset
   717
  virtual void walk_mem_region_with_cl(MemRegion mr,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   718
                                       HeapWord* bottom, HeapWord* top,
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   719
                                       ExtendedOopClosure* cl);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   720
  virtual void walk_mem_region_with_cl(MemRegion mr,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   721
                                       HeapWord* bottom, HeapWord* top,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   722
                                       FilteringClosure* cl);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   723
489c9b5090e2 Initial load
duke
parents:
diff changeset
   724
public:
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   725
  ContiguousSpaceDCTOC(ContiguousSpace* sp, ExtendedOopClosure* cl,
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   726
                       CardTableModRefBS::PrecisionStyle precision,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   727
                       HeapWord* boundary) :
35492
c8c0273e6b91 8146690: Make all classes in GC follow the naming convention.
david
parents: 35061
diff changeset
   728
    FilteringDCTOC(sp, cl, precision, boundary)
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   729
  {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   730
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   731
489c9b5090e2 Initial load
duke
parents:
diff changeset
   732
// A ContigSpace that Supports an efficient "block_start" operation via
489c9b5090e2 Initial load
duke
parents:
diff changeset
   733
// a BlockOffsetArray (whose BlockOffsetSharedArray may be shared with
489c9b5090e2 Initial load
duke
parents:
diff changeset
   734
// other spaces.)  This is the abstract base class for old generation
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   735
// (tenured) spaces.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   736
489c9b5090e2 Initial load
duke
parents:
diff changeset
   737
class OffsetTableContigSpace: public ContiguousSpace {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   738
  friend class VMStructs;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   739
 protected:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   740
  BlockOffsetArrayContigSpace _offsets;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   741
  Mutex _par_alloc_lock;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   742
489c9b5090e2 Initial load
duke
parents:
diff changeset
   743
 public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   744
  // Constructor
489c9b5090e2 Initial load
duke
parents:
diff changeset
   745
  OffsetTableContigSpace(BlockOffsetSharedArray* sharedOffsetArray,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   746
                         MemRegion mr);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   747
489c9b5090e2 Initial load
duke
parents:
diff changeset
   748
  void set_bottom(HeapWord* value);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   749
  void set_end(HeapWord* value);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   750
971
f0b20be4165d 6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents: 360
diff changeset
   751
  void clear(bool mangle_space);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   752
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents: 360
diff changeset
   753
  inline HeapWord* block_start_const(const void* p) const;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   754
489c9b5090e2 Initial load
duke
parents:
diff changeset
   755
  // Add offset table update.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   756
  virtual inline HeapWord* allocate(size_t word_size);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   757
  inline HeapWord* par_allocate(size_t word_size);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   758
489c9b5090e2 Initial load
duke
parents:
diff changeset
   759
  // MarkSweep support phase3
489c9b5090e2 Initial load
duke
parents:
diff changeset
   760
  virtual HeapWord* initialize_threshold();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   761
  virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   762
489c9b5090e2 Initial load
duke
parents:
diff changeset
   763
  virtual void print_on(outputStream* st) const;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   764
489c9b5090e2 Initial load
duke
parents:
diff changeset
   765
  // Debugging
12379
2cf45b79ce3a 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 11247
diff changeset
   766
  void verify() const;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   767
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   768
489c9b5090e2 Initial load
duke
parents:
diff changeset
   769
489c9b5090e2 Initial load
duke
parents:
diff changeset
   770
// Class TenuredSpace is used by TenuredGeneration
489c9b5090e2 Initial load
duke
parents:
diff changeset
   771
489c9b5090e2 Initial load
duke
parents:
diff changeset
   772
class TenuredSpace: public OffsetTableContigSpace {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   773
  friend class VMStructs;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   774
 protected:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   775
  // Mark sweep support
1557
13878a2edfef 6765804: GC "dead ratios" should be unsigned
jcoomes
parents: 1388
diff changeset
   776
  size_t allowed_dead_ratio() const;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   777
 public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   778
  // Constructor
489c9b5090e2 Initial load
duke
parents:
diff changeset
   779
  TenuredSpace(BlockOffsetSharedArray* sharedOffsetArray,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   780
               MemRegion mr) :
489c9b5090e2 Initial load
duke
parents:
diff changeset
   781
    OffsetTableContigSpace(sharedOffsetArray, mr) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   782
};
30764
fec48bf5a827 8079792: GC directory structure cleanup
pliden
parents: 29703
diff changeset
   783
#endif // SHARE_VM_GC_SHARED_SPACE_HPP