author | shade |
Thu, 30 Nov 2017 17:13:33 +0100 | |
branch | epsilon-gc-branch |
changeset 55934 | 912c55e702d6 |
parent 55767 | 8e22715afabc |
parent 47998 | fb0275c320a0 |
child 55938 | d7b4990d04d6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 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_BARRIERSET_HPP |
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#define SHARE_VM_GC_SHARED_BARRIERSET_HPP |
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#include "gc/shared/barrierSetConfig.hpp" |
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#include "memory/memRegion.hpp" |
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#include "oops/access.hpp" |
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#include "oops/accessBackend.hpp" |
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#include "oops/oopsHierarchy.hpp" |
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#include "utilities/fakeRttiSupport.hpp" |
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// This class provides the interface between a barrier implementation and |
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// the rest of the system. |
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class BarrierSet: public CHeapObj<mtGC> { |
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friend class VMStructs; |
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static BarrierSet* _bs; |
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public: |
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enum Name { |
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#define BARRIER_SET_DECLARE_BS_ENUM(bs_name) bs_name , |
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FOR_EACH_BARRIER_SET_DO(BARRIER_SET_DECLARE_BS_ENUM) |
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#undef BARRIER_SET_DECLARE_BS_ENUM |
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UnknownBS |
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}; |
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static BarrierSet* barrier_set() { return _bs; } |
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protected: |
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// Fake RTTI support. For a derived class T to participate |
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// - T must have a corresponding Name entry. |
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// - GetName<T> must be specialized to return the corresponding Name |
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// entry. |
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// - If T is a base class, the constructor must have a FakeRtti |
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// parameter and pass it up to its base class, with the tag set |
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// augmented with the corresponding Name entry. |
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// - If T is a concrete class, the constructor must create a |
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// FakeRtti object whose tag set includes the corresponding Name |
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// entry, and pass it up to its base class. |
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typedef FakeRttiSupport<BarrierSet, Name> FakeRtti; |
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private: |
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FakeRtti _fake_rtti; |
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// Metafunction mapping a class derived from BarrierSet to the |
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// corresponding Name enum tag. |
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template<typename T> struct GetName; |
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// Metafunction mapping a Name enum type to the corresponding |
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// lass derived from BarrierSet. |
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template<BarrierSet::Name T> struct GetType; |
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// Note: This is not presently the Name corresponding to the |
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// concrete class of this object. |
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BarrierSet::Name kind() const { return _fake_rtti.concrete_tag(); } |
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// Test whether this object is of the type corresponding to bsn. |
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bool is_a(BarrierSet::Name bsn) const { return _fake_rtti.has_tag(bsn); } |
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// End of fake RTTI support. |
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BarrierSet(const FakeRtti& fake_rtti) : _fake_rtti(fake_rtti) { } |
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~BarrierSet() { } |
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// Operations on arrays, or general regions (e.g., for "clone") may be |
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// optimized by some barriers. |
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// Below length is the # array elements being written |
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virtual void write_ref_array_pre(oop* dst, int length, |
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bool dest_uninitialized = false) {} |
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virtual void write_ref_array_pre(narrowOop* dst, int length, |
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bool dest_uninitialized = false) {} |
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// Below count is the # array elements being written, starting |
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// at the address "start", which may not necessarily be HeapWord-aligned |
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inline void write_ref_array(HeapWord* start, size_t count); |
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// Static versions, suitable for calling from generated code; |
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// count is # array elements being written, starting with "start", |
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// which may not necessarily be HeapWord-aligned. |
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static void static_write_ref_array_pre(HeapWord* start, size_t count); |
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static void static_write_ref_array_post(HeapWord* start, size_t count); |
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virtual void write_ref_array_work(MemRegion mr) = 0; |
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// (For efficiency reasons, this operation is specialized for certain |
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// barrier types. Semantically, it should be thought of as a call to the |
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// virtual "_work" function below, which must implement the barrier.) |
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void write_region(MemRegion mr); |
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virtual void write_region_work(MemRegion mr) = 0; |
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// Inform the BarrierSet that the the covered heap region that starts |
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// with "base" has been changed to have the given size (possibly from 0, |
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// for initialization.) |
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virtual void resize_covered_region(MemRegion new_region) = 0; |
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// If the barrier set imposes any alignment restrictions on boundaries |
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// within the heap, this function tells whether they are met. |
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virtual bool is_aligned(HeapWord* addr) = 0; |
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// Print a description of the memory for the barrier set |
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virtual void print_on(outputStream* st) const = 0; |
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static void set_bs(BarrierSet* bs) { _bs = bs; } |
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// The AccessBarrier of a BarrierSet subclass is called by the Access API |
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// (cf. oops/access.hpp) to perform decorated accesses. GC implementations |
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// may override these default access operations by declaring an |
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// AccessBarrier class in its BarrierSet. Its accessors will then be |
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// automatically resolved at runtime. |
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// |
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// In order to register a new FooBarrierSet::AccessBarrier with the Access API, |
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// the following steps should be taken: |
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// 1) Provide an enum "name" for the BarrierSet in barrierSetConfig.hpp |
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// 2) Make sure the barrier set headers are included from barrierSetConfig.inline.hpp |
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// 3) Provide specializations for BarrierSet::GetName and BarrierSet::GetType. |
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template <DecoratorSet decorators, typename BarrierSetT> |
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class AccessBarrier: protected RawAccessBarrier<decorators> { |
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protected: |
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typedef RawAccessBarrier<decorators> Raw; |
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typedef typename BarrierSetT::template AccessBarrier<decorators> CRTPAccessBarrier; |
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public: |
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// Primitive heap accesses. These accessors get resolved when |
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// IN_HEAP is set (e.g. when using the HeapAccess API), it is |
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// not an oop_* overload, and the barrier strength is AS_NORMAL. |
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template <typename T> |
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static T load_in_heap(T* addr) { |
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return Raw::template load<T>(addr); |
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} |
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template <typename T> |
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static T load_in_heap_at(oop base, ptrdiff_t offset) { |
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return Raw::template load_at<T>(base, offset); |
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} |
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template <typename T> |
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static void store_in_heap(T* addr, T value) { |
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Raw::store(addr, value); |
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} |
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template <typename T> |
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static void store_in_heap_at(oop base, ptrdiff_t offset, T value) { |
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Raw::store_at(base, offset, value); |
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} |
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template <typename T> |
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static T atomic_cmpxchg_in_heap(T new_value, T* addr, T compare_value) { |
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return Raw::atomic_cmpxchg(new_value, addr, compare_value); |
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} |
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template <typename T> |
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static T atomic_cmpxchg_in_heap_at(T new_value, oop base, ptrdiff_t offset, T compare_value) { |
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return Raw::oop_atomic_cmpxchg_at(new_value, base, offset, compare_value); |
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} |
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template <typename T> |
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static T atomic_xchg_in_heap(T new_value, T* addr) { |
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return Raw::atomic_xchg(new_value, addr); |
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} |
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template <typename T> |
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static T atomic_xchg_in_heap_at(T new_value, oop base, ptrdiff_t offset) { |
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return Raw::atomic_xchg_at(new_value, base, offset); |
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} |
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template <typename T> |
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static bool arraycopy_in_heap(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) { |
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return Raw::arraycopy(src_obj, dst_obj, src, dst, length); |
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} |
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// Heap oop accesses. These accessors get resolved when |
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// IN_HEAP is set (e.g. when using the HeapAccess API), it is |
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// an oop_* overload, and the barrier strength is AS_NORMAL. |
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template <typename T> |
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static oop oop_load_in_heap(T* addr) { |
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return Raw::template oop_load<oop>(addr); |
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} |
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static oop oop_load_in_heap_at(oop base, ptrdiff_t offset) { |
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return Raw::template oop_load_at<oop>(base, offset); |
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} |
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template <typename T> |
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static void oop_store_in_heap(T* addr, oop value) { |
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Raw::oop_store(addr, value); |
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} |
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static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) { |
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Raw::oop_store_at(base, offset, value); |
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} |
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template <typename T> |
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static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value) { |
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return Raw::oop_atomic_cmpxchg(new_value, addr, compare_value); |
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} |
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|
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static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) { |
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return Raw::oop_atomic_cmpxchg_at(new_value, base, offset, compare_value); |
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} |
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template <typename T> |
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static oop oop_atomic_xchg_in_heap(oop new_value, T* addr) { |
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return Raw::oop_atomic_xchg(new_value, addr); |
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} |
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|
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static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset) { |
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return Raw::oop_atomic_xchg_at(new_value, base, offset); |
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} |
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template <typename T> |
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static bool oop_arraycopy_in_heap(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) { |
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return Raw::oop_arraycopy(src_obj, dst_obj, src, dst, length); |
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} |
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|
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// Off-heap oop accesses. These accessors get resolved when |
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// IN_HEAP is not set (e.g. when using the RootAccess API), it is |
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// an oop* overload, and the barrier strength is AS_NORMAL. |
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template <typename T> |
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static oop oop_load_not_in_heap(T* addr) { |
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return Raw::template oop_load<oop>(addr); |
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} |
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|
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template <typename T> |
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static void oop_store_not_in_heap(T* addr, oop value) { |
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Raw::oop_store(addr, value); |
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} |
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|
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template <typename T> |
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static oop oop_atomic_cmpxchg_not_in_heap(oop new_value, T* addr, oop compare_value) { |
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return Raw::oop_atomic_cmpxchg(new_value, addr, compare_value); |
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} |
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|
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template <typename T> |
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static oop oop_atomic_xchg_not_in_heap(oop new_value, T* addr) { |
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return Raw::oop_atomic_xchg(new_value, addr); |
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} |
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// Clone barrier support |
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static void clone_in_heap(oop src, oop dst, size_t size) { |
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Raw::clone(src, dst, size); |
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} |
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}; |
1 | 276 |
}; |
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template<typename T> |
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inline T* barrier_set_cast(BarrierSet* bs) { |
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assert(bs->is_a(BarrierSet::GetName<T>::value), "wrong type of barrier set"); |
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return static_cast<T*>(bs); |
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} |
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|
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#endif // SHARE_VM_GC_SHARED_BARRIERSET_HPP |