author | jmasa |
Fri, 01 Aug 2014 15:40:12 -0700 | |
changeset 25905 | 04a3d83cc752 |
parent 22551 | 9bf46d16dcc6 |
child 30291 | 54cdc5c1a9cb |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2012, 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_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP |
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#include "runtime/virtualspace.hpp" |
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// VirtualSpace for the parallel scavenge collector. |
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// |
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// VirtualSpace is data structure for committing a previously reserved address |
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// range in smaller chunks. |
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class PSVirtualSpace : public CHeapObj<mtGC> { |
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friend class VMStructs; |
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protected: |
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// The space is committed/uncommitted in chunks of size _alignment. The |
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// ReservedSpace passed to initialize() must be aligned to this value. |
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const size_t _alignment; |
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// Reserved area |
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char* _reserved_low_addr; |
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char* _reserved_high_addr; |
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// Committed area |
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char* _committed_low_addr; |
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char* _committed_high_addr; |
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// The entire space has been committed and pinned in memory, no |
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// os::commit_memory() or os::uncommit_memory(). |
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bool _special; |
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// Convenience wrapper. |
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inline static size_t pointer_delta(const char* left, const char* right); |
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public: |
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PSVirtualSpace(ReservedSpace rs, size_t alignment); |
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PSVirtualSpace(ReservedSpace rs); |
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~PSVirtualSpace(); |
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// Eventually all instances should be created with the above 1- or 2-arg |
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// constructors. Then the 1st constructor below should become protected and |
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// the 2nd ctor and initialize() removed. |
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PSVirtualSpace(size_t alignment): _alignment(alignment) { } |
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PSVirtualSpace(); |
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bool initialize(ReservedSpace rs, size_t commit_size); |
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bool contains(void* p) const; |
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// Accessors (all sizes are bytes). |
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size_t alignment() const { return _alignment; } |
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char* reserved_low_addr() const { return _reserved_low_addr; } |
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char* reserved_high_addr() const { return _reserved_high_addr; } |
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char* committed_low_addr() const { return _committed_low_addr; } |
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char* committed_high_addr() const { return _committed_high_addr; } |
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bool special() const { return _special; } |
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inline size_t committed_size() const; |
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inline size_t reserved_size() const; |
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inline size_t uncommitted_size() const; |
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// Operations. |
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inline void set_reserved(char* low_addr, char* high_addr, bool special); |
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inline void set_reserved(ReservedSpace rs); |
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inline void set_committed(char* low_addr, char* high_addr); |
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virtual bool expand_by(size_t bytes); |
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virtual bool shrink_by(size_t bytes); |
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virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); |
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void release(); |
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#ifndef PRODUCT |
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// Debugging |
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static bool is_aligned(size_t val, size_t align); |
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bool is_aligned(size_t val) const; |
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bool is_aligned(char* val) const; |
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void verify() const; |
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void print() const; |
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virtual bool grows_up() const { return true; } |
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bool grows_down() const { return !grows_up(); } |
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// Helper class to verify a space when entering/leaving a block. |
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class PSVirtualSpaceVerifier: public StackObj { |
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private: |
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const PSVirtualSpace* const _space; |
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public: |
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PSVirtualSpaceVerifier(PSVirtualSpace* space): _space(space) { |
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_space->verify(); |
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} |
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~PSVirtualSpaceVerifier() { _space->verify(); } |
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}; |
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#endif |
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virtual void print_space_boundaries_on(outputStream* st) const; |
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// Included for compatibility with the original VirtualSpace. |
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public: |
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// Committed area |
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char* low() const { return committed_low_addr(); } |
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char* high() const { return committed_high_addr(); } |
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// Reserved area |
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char* low_boundary() const { return reserved_low_addr(); } |
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char* high_boundary() const { return reserved_high_addr(); } |
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}; |
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// A virtual space that grows from high addresses to low addresses. |
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class PSVirtualSpaceHighToLow : public PSVirtualSpace { |
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friend class VMStructs; |
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public: |
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PSVirtualSpaceHighToLow(ReservedSpace rs, size_t alignment); |
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PSVirtualSpaceHighToLow(ReservedSpace rs); |
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virtual bool expand_by(size_t bytes); |
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virtual bool shrink_by(size_t bytes); |
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virtual size_t expand_into(PSVirtualSpace* space, size_t bytes); |
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virtual void print_space_boundaries_on(outputStream* st) const; |
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#ifndef PRODUCT |
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// Debugging |
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virtual bool grows_up() const { return false; } |
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#endif |
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}; |
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// |
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// PSVirtualSpace inlines. |
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// |
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inline size_t |
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PSVirtualSpace::pointer_delta(const char* left, const char* right) { |
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return ::pointer_delta((void *)left, (void*)right, sizeof(char)); |
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} |
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inline size_t PSVirtualSpace::committed_size() const { |
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return pointer_delta(committed_high_addr(), committed_low_addr()); |
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} |
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inline size_t PSVirtualSpace::reserved_size() const { |
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return pointer_delta(reserved_high_addr(), reserved_low_addr()); |
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} |
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inline size_t PSVirtualSpace::uncommitted_size() const { |
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return reserved_size() - committed_size(); |
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} |
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inline void PSVirtualSpace::set_reserved(char* low_addr, char* high_addr, bool special) { |
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_reserved_low_addr = low_addr; |
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_reserved_high_addr = high_addr; |
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_special = special; |
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} |
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inline void PSVirtualSpace::set_reserved(ReservedSpace rs) { |
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set_reserved(rs.base(), rs.base() + rs.size(), rs.special()); |
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} |
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inline void PSVirtualSpace::set_committed(char* low_addr, char* high_addr) { |
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_committed_low_addr = low_addr; |
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_committed_high_addr = high_addr; |
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} |
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#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP |