fca9e37c80
Declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung
128 lines
4.4 KiB
C++
128 lines
4.4 KiB
C++
/*
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* Copyright (c) 2000, 2013, 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_MEMORY_MEMREGION_HPP
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#define SHARE_VM_MEMORY_MEMREGION_HPP
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#include "memory/allocation.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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// A very simple data structure representing a contigous region
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// region of address space.
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// Note that MemRegions are passed by value, not by reference.
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// The intent is that they remain very small and contain no
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// objects. _ValueObj should never be allocated in heap but we do
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// create MemRegions (in CardTableModRefBS) in heap so operator
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// new and operator new [] added for this special case.
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class MetaWord;
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class MemRegion VALUE_OBJ_CLASS_SPEC {
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friend class VMStructs;
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private:
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HeapWord* _start;
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size_t _word_size;
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public:
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MemRegion() : _start(NULL), _word_size(0) {};
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MemRegion(HeapWord* start, size_t word_size) :
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_start(start), _word_size(word_size) {};
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MemRegion(HeapWord* start, HeapWord* end) :
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_start(start), _word_size(pointer_delta(end, start)) {
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assert(end >= start, "incorrect constructor arguments");
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}
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MemRegion(MetaWord* start, MetaWord* end) :
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_start((HeapWord*)start), _word_size(pointer_delta(end, start)) {
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assert(end >= start, "incorrect constructor arguments");
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}
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MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {}
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MemRegion intersection(const MemRegion mr2) const;
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// regions must overlap or be adjacent
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MemRegion _union(const MemRegion mr2) const;
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// minus will fail a guarantee if mr2 is interior to this,
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// since there's no way to return 2 disjoint regions.
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MemRegion minus(const MemRegion mr2) const;
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HeapWord* start() const { return _start; }
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HeapWord* end() const { return _start + _word_size; }
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HeapWord* last() const { return _start + _word_size - 1; }
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void set_start(HeapWord* start) { _start = start; }
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void set_end(HeapWord* end) { _word_size = pointer_delta(end, _start); }
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void set_word_size(size_t word_size) {
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_word_size = word_size;
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}
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bool contains(const MemRegion mr2) const {
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return _start <= mr2._start && end() >= mr2.end();
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}
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bool contains(const void* addr) const {
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return addr >= (void*)_start && addr < (void*)end();
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}
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bool equals(const MemRegion mr2) const {
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// first disjunct since we do not have a canonical empty set
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return ((is_empty() && mr2.is_empty()) ||
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(start() == mr2.start() && end() == mr2.end()));
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}
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size_t byte_size() const { return _word_size * sizeof(HeapWord); }
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size_t word_size() const { return _word_size; }
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bool is_empty() const { return word_size() == 0; }
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void* operator new(size_t size) throw();
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void* operator new [](size_t size) throw();
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void operator delete(void* p);
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void operator delete [](void* p);
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};
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// For iteration over MemRegion's.
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class MemRegionClosure : public StackObj {
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public:
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virtual void do_MemRegion(MemRegion mr) = 0;
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};
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// A ResourceObj version of MemRegionClosure
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class MemRegionClosureRO: public MemRegionClosure {
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public:
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void* operator new(size_t size, ResourceObj::allocation_type type, MEMFLAGS flags) throw() {
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return ResourceObj::operator new(size, type, flags);
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}
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void* operator new(size_t size, Arena *arena) throw() {
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return ResourceObj::operator new(size, arena);
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}
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void* operator new(size_t size) throw() {
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return ResourceObj::operator new(size);
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}
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void operator delete(void* p) {} // nothing to do
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};
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#endif // SHARE_VM_MEMORY_MEMREGION_HPP
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