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src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.hpp@c18cbe5936b8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.hpp

Thu, 27 May 2010 19:08:38 -0700

author
trims
date
Thu, 27 May 2010 19:08:38 -0700
changeset 1907
c18cbe5936b8
parent 1014
0fbdb4381b99
child 2314
f95d63e2154a
permissions
-rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

duke@435 1 /*
trims@1907 2 * Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
duke@435 25 // VirtualSpace for the parallel scavenge collector.
duke@435 26 //
duke@435 27 // VirtualSpace is data structure for committing a previously reserved address
duke@435 28 // range in smaller chunks.
duke@435 29
duke@435 30 class PSVirtualSpace : public CHeapObj {
duke@435 31 friend class VMStructs;
duke@435 32 protected:
duke@435 33 // The space is committed/uncommited in chunks of size _alignment. The
duke@435 34 // ReservedSpace passed to initialize() must be aligned to this value.
duke@435 35 const size_t _alignment;
duke@435 36
duke@435 37 // Reserved area
duke@435 38 char* _reserved_low_addr;
duke@435 39 char* _reserved_high_addr;
duke@435 40
duke@435 41 // Committed area
duke@435 42 char* _committed_low_addr;
duke@435 43 char* _committed_high_addr;
duke@435 44
duke@435 45 // The entire space has been committed and pinned in memory, no
duke@435 46 // os::commit_memory() or os::uncommit_memory().
duke@435 47 bool _special;
duke@435 48
duke@435 49 // Convenience wrapper.
duke@435 50 inline static size_t pointer_delta(const char* left, const char* right);
duke@435 51
duke@435 52 public:
duke@435 53 PSVirtualSpace(ReservedSpace rs, size_t alignment);
duke@435 54 PSVirtualSpace(ReservedSpace rs);
duke@435 55
duke@435 56 ~PSVirtualSpace();
duke@435 57
duke@435 58 // Eventually all instances should be created with the above 1- or 2-arg
duke@435 59 // constructors. Then the 1st constructor below should become protected and
duke@435 60 // the 2nd ctor and initialize() removed.
duke@435 61 PSVirtualSpace(size_t alignment): _alignment(alignment) { }
duke@435 62 PSVirtualSpace();
duke@435 63 bool initialize(ReservedSpace rs, size_t commit_size);
duke@435 64
duke@435 65 bool contains(void* p) const;
duke@435 66
duke@435 67 // Accessors (all sizes are bytes).
duke@435 68 size_t alignment() const { return _alignment; }
duke@435 69 char* reserved_low_addr() const { return _reserved_low_addr; }
duke@435 70 char* reserved_high_addr() const { return _reserved_high_addr; }
duke@435 71 char* committed_low_addr() const { return _committed_low_addr; }
duke@435 72 char* committed_high_addr() const { return _committed_high_addr; }
duke@435 73 bool special() const { return _special; }
duke@435 74
duke@435 75 inline size_t committed_size() const;
duke@435 76 inline size_t reserved_size() const;
duke@435 77 inline size_t uncommitted_size() const;
duke@435 78
duke@435 79 // Operations.
duke@435 80 inline void set_reserved(char* low_addr, char* high_addr, bool special);
duke@435 81 inline void set_reserved(ReservedSpace rs);
duke@435 82 inline void set_committed(char* low_addr, char* high_addr);
iveresov@970 83 virtual bool expand_by(size_t bytes);
duke@435 84 virtual bool shrink_by(size_t bytes);
duke@435 85 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes);
duke@435 86 void release();
duke@435 87
duke@435 88 #ifndef PRODUCT
duke@435 89 // Debugging
duke@435 90 static bool is_aligned(size_t val, size_t align);
duke@435 91 bool is_aligned(size_t val) const;
duke@435 92 bool is_aligned(char* val) const;
duke@435 93 void verify() const;
duke@435 94 void print() const;
duke@435 95 virtual bool grows_up() const { return true; }
duke@435 96 bool grows_down() const { return !grows_up(); }
duke@435 97
duke@435 98 // Helper class to verify a space when entering/leaving a block.
duke@435 99 class PSVirtualSpaceVerifier: public StackObj {
duke@435 100 private:
duke@435 101 const PSVirtualSpace* const _space;
duke@435 102 public:
duke@435 103 PSVirtualSpaceVerifier(PSVirtualSpace* space): _space(space) {
duke@435 104 _space->verify();
duke@435 105 }
duke@435 106 ~PSVirtualSpaceVerifier() { _space->verify(); }
duke@435 107 };
duke@435 108 #endif
duke@435 109
duke@435 110 virtual void print_space_boundaries_on(outputStream* st) const;
duke@435 111
duke@435 112 // Included for compatibility with the original VirtualSpace.
duke@435 113 public:
duke@435 114 // Committed area
duke@435 115 char* low() const { return committed_low_addr(); }
duke@435 116 char* high() const { return committed_high_addr(); }
duke@435 117
duke@435 118 // Reserved area
duke@435 119 char* low_boundary() const { return reserved_low_addr(); }
duke@435 120 char* high_boundary() const { return reserved_high_addr(); }
duke@435 121 };
duke@435 122
duke@435 123 // A virtual space that grows from high addresses to low addresses.
duke@435 124 class PSVirtualSpaceHighToLow : public PSVirtualSpace {
duke@435 125 friend class VMStructs;
duke@435 126 public:
duke@435 127 PSVirtualSpaceHighToLow(ReservedSpace rs, size_t alignment);
duke@435 128 PSVirtualSpaceHighToLow(ReservedSpace rs);
duke@435 129
iveresov@970 130 virtual bool expand_by(size_t bytes);
duke@435 131 virtual bool shrink_by(size_t bytes);
duke@435 132 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes);
duke@435 133
duke@435 134 virtual void print_space_boundaries_on(outputStream* st) const;
duke@435 135
duke@435 136 #ifndef PRODUCT
duke@435 137 // Debugging
duke@435 138 virtual bool grows_up() const { return false; }
duke@435 139 #endif
duke@435 140 };
duke@435 141
duke@435 142 //
duke@435 143 // PSVirtualSpace inlines.
duke@435 144 //
duke@435 145 inline size_t
duke@435 146 PSVirtualSpace::pointer_delta(const char* left, const char* right) {
duke@435 147 return ::pointer_delta((void *)left, (void*)right, sizeof(char));
duke@435 148 }
duke@435 149
duke@435 150 inline size_t PSVirtualSpace::committed_size() const {
duke@435 151 return pointer_delta(committed_high_addr(), committed_low_addr());
duke@435 152 }
duke@435 153
duke@435 154 inline size_t PSVirtualSpace::reserved_size() const {
duke@435 155 return pointer_delta(reserved_high_addr(), reserved_low_addr());
duke@435 156 }
duke@435 157
duke@435 158 inline size_t PSVirtualSpace::uncommitted_size() const {
duke@435 159 return reserved_size() - committed_size();
duke@435 160 }
duke@435 161
duke@435 162 inline void PSVirtualSpace::set_reserved(char* low_addr, char* high_addr, bool special) {
duke@435 163 _reserved_low_addr = low_addr;
duke@435 164 _reserved_high_addr = high_addr;
duke@435 165 _special = special;
duke@435 166 }
duke@435 167
duke@435 168 inline void PSVirtualSpace::set_reserved(ReservedSpace rs) {
duke@435 169 set_reserved(rs.base(), rs.base() + rs.size(), rs.special());
duke@435 170 }
duke@435 171
duke@435 172 inline void PSVirtualSpace::set_committed(char* low_addr, char* high_addr) {
duke@435 173 _committed_low_addr = low_addr;
duke@435 174 _committed_high_addr = high_addr;
duke@435 175 }

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