--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.hpp Mon Dec 10 15:47:44 2018 +0100
@@ -0,0 +1,296 @@
+/*
+ * Copyright (c) 2013, 2018, Red Hat, Inc. All rights reserved.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP
+#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP
+
+#include "gc/shared/accessBarrierSupport.hpp"
+#include "gc/shared/barrierSet.hpp"
+#include "gc/shenandoah/shenandoahHeap.hpp"
+#include "gc/shenandoah/shenandoahSATBMarkQueueSet.hpp"
+
+class ShenandoahBarrierSetAssembler;
+
+class ShenandoahBarrierSet: public BarrierSet {
+private:
+ enum ArrayCopyStoreValMode {
+ NONE,
+ READ_BARRIER,
+ WRITE_BARRIER
+ };
+
+ ShenandoahHeap* _heap;
+ ShenandoahSATBMarkQueueSet _satb_mark_queue_set;
+
+public:
+ ShenandoahBarrierSet(ShenandoahHeap* heap);
+
+ static ShenandoahBarrierSetAssembler* assembler();
+
+ inline static ShenandoahBarrierSet* barrier_set() {
+ return barrier_set_cast<ShenandoahBarrierSet>(BarrierSet::barrier_set());
+ }
+
+ static ShenandoahSATBMarkQueueSet& satb_mark_queue_set() {
+ return barrier_set()->_satb_mark_queue_set;
+ }
+
+ void print_on(outputStream* st) const;
+
+ bool is_a(BarrierSet::Name bsn);
+
+ bool is_aligned(HeapWord* hw);
+
+ void write_ref_array(HeapWord* start, size_t count);
+
+ template <class T> void
+ write_ref_array_pre_work(T* dst, size_t count);
+
+ void write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized);
+
+ void write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized);
+
+ // We export this to make it available in cases where the static
+ // type of the barrier set is known. Note that it is non-virtual.
+ template <class T> inline void inline_write_ref_field_pre(T* field, oop new_val);
+
+ // These are the more general virtual versions.
+ void write_ref_field_pre_work(oop* field, oop new_val);
+ void write_ref_field_pre_work(narrowOop* field, oop new_val);
+ void write_ref_field_pre_work(void* field, oop new_val);
+
+ void write_ref_field_work(void* v, oop o, bool release = false);
+ void write_region(MemRegion mr);
+
+ virtual void on_thread_create(Thread* thread);
+ virtual void on_thread_destroy(Thread* thread);
+ virtual void on_thread_attach(JavaThread* thread);
+ virtual void on_thread_detach(JavaThread* thread);
+
+ virtual oop read_barrier(oop src);
+
+ static inline oop resolve_forwarded_not_null(oop p);
+ static inline oop resolve_forwarded(oop p);
+
+ virtual oop write_barrier(oop obj);
+
+ oop write_barrier_mutator(oop obj);
+
+ virtual oop storeval_barrier(oop obj);
+
+ virtual void keep_alive_barrier(oop obj);
+
+ bool obj_equals(oop obj1, oop obj2);
+
+#ifdef CHECK_UNHANDLED_OOPS
+ bool oop_equals_operator_allowed() { return !ShenandoahVerifyObjectEquals; }
+#endif
+
+ void enqueue(oop obj);
+
+private:
+ inline bool need_update_refs_barrier();
+
+ template <class T, bool STOREVAL_WRITE_BARRIER>
+ void write_ref_array_loop(HeapWord* start, size_t count);
+
+ oop write_barrier_impl(oop obj);
+
+ static void keep_alive_if_weak(DecoratorSet decorators, oop value) {
+ assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
+ const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0;
+ const bool peek = (decorators & AS_NO_KEEPALIVE) != 0;
+ if (!peek && !on_strong_oop_ref && value != NULL) {
+ ShenandoahBarrierSet::barrier_set()->keep_alive_barrier(value);
+ }
+ }
+
+ template <typename T>
+ bool arraycopy_loop_1(T* src, T* dst, size_t length, Klass* bound,
+ bool checkcast, bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode);
+
+ template <typename T, bool CHECKCAST>
+ bool arraycopy_loop_2(T* src, T* dst, size_t length, Klass* bound,
+ bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode);
+
+ template <typename T, bool CHECKCAST, bool SATB>
+ bool arraycopy_loop_3(T* src, T* dst, size_t length, Klass* bound,
+ bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode);
+
+ template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
+ bool arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint);
+
+ template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
+ bool arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* thread);
+
+public:
+ // Callbacks for runtime accesses.
+ template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet>
+ class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
+ typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
+
+ public:
+ // Primitive heap accesses. These accessors get resolved when
+ // IN_HEAP is set (e.g. when using the HeapAccess API), it is
+ // not an oop_* overload, and the barrier strength is AS_NORMAL.
+ template <typename T>
+ static T load_in_heap(T* addr) {
+ ShouldNotReachHere();
+ return Raw::template load<T>(addr);
+ }
+
+ template <typename T>
+ static T load_in_heap_at(oop base, ptrdiff_t offset) {
+ base = ShenandoahBarrierSet::resolve_forwarded(base);
+ return Raw::template load_at<T>(base, offset);
+ }
+
+ template <typename T>
+ static void store_in_heap(T* addr, T value) {
+ ShouldNotReachHere();
+ Raw::store(addr, value);
+ }
+
+ template <typename T>
+ static void store_in_heap_at(oop base, ptrdiff_t offset, T value) {
+ base = ShenandoahBarrierSet::barrier_set()->write_barrier(base);
+ Raw::store_at(base, offset, value);
+ }
+
+ template <typename T>
+ static T atomic_cmpxchg_in_heap(T new_value, T* addr, T compare_value) {
+ ShouldNotReachHere();
+ return Raw::atomic_cmpxchg(new_value, addr, compare_value);
+ }
+
+ template <typename T>
+ static T atomic_cmpxchg_in_heap_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
+ base = ShenandoahBarrierSet::barrier_set()->write_barrier(base);
+ return Raw::atomic_cmpxchg_at(new_value, base, offset, compare_value);
+ }
+
+ template <typename T>
+ static T atomic_xchg_in_heap(T new_value, T* addr) {
+ ShouldNotReachHere();
+ return Raw::atomic_xchg(new_value, addr);
+ }
+
+ template <typename T>
+ static T atomic_xchg_in_heap_at(T new_value, oop base, ptrdiff_t offset) {
+ base = ShenandoahBarrierSet::barrier_set()->write_barrier(base);
+ return Raw::atomic_xchg_at(new_value, base, offset);
+ }
+
+ template <typename T>
+ static void arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
+ arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
+ size_t length);
+
+ // Heap oop accesses. These accessors get resolved when
+ // IN_HEAP is set (e.g. when using the HeapAccess API), it is
+ // an oop_* overload, and the barrier strength is AS_NORMAL.
+ template <typename T>
+ static oop oop_load_in_heap(T* addr) {
+ // ShouldNotReachHere();
+ oop value = Raw::template oop_load<oop>(addr);
+ keep_alive_if_weak(decorators, value);
+ return value;
+ }
+
+ static oop oop_load_in_heap_at(oop base, ptrdiff_t offset) {
+ base = ShenandoahBarrierSet::resolve_forwarded(base);
+ oop value = Raw::template oop_load_at<oop>(base, offset);
+ keep_alive_if_weak(AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset), value);
+ return value;
+ }
+
+ template <typename T>
+ static void oop_store_in_heap(T* addr, oop value) {
+ ShenandoahBarrierSet::barrier_set()->write_ref_field_pre_work(addr, value);
+ Raw::oop_store(addr, value);
+ }
+
+ static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) {
+ base = ShenandoahBarrierSet::barrier_set()->write_barrier(base);
+ value = ShenandoahBarrierSet::barrier_set()->storeval_barrier(value);
+
+ oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value);
+ }
+
+ template <typename T>
+ static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value);
+
+ static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
+ base = ShenandoahBarrierSet::barrier_set()->write_barrier(base);
+ new_value = ShenandoahBarrierSet::barrier_set()->storeval_barrier(new_value);
+ return oop_atomic_cmpxchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset), compare_value);
+ }
+
+ template <typename T>
+ static oop oop_atomic_xchg_in_heap(oop new_value, T* addr);
+
+ static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset) {
+ base = ShenandoahBarrierSet::barrier_set()->write_barrier(base);
+ new_value = ShenandoahBarrierSet::barrier_set()->storeval_barrier(new_value);
+ return oop_atomic_xchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset));
+ }
+
+ template <typename T>
+ static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
+ arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
+ size_t length);
+
+ // Clone barrier support
+ static void clone_in_heap(oop src, oop dst, size_t size);
+
+ // Needed for loads on non-heap weak references
+ template <typename T>
+ static oop oop_load_not_in_heap(T* addr) {
+ oop value = Raw::oop_load_not_in_heap(addr);
+ keep_alive_if_weak(decorators, value);
+ return value;
+ }
+
+ static oop resolve(oop obj) {
+ return ShenandoahBarrierSet::barrier_set()->write_barrier(obj);
+ }
+
+ static bool equals(oop o1, oop o2) {
+ return ShenandoahBarrierSet::barrier_set()->obj_equals(o1, o2);
+ }
+
+ };
+
+};
+
+template<>
+struct BarrierSet::GetName<ShenandoahBarrierSet> {
+ static const BarrierSet::Name value = BarrierSet::ShenandoahBarrierSet;
+};
+
+template<>
+struct BarrierSet::GetType<BarrierSet::ShenandoahBarrierSet> {
+ typedef ::ShenandoahBarrierSet type;
+};
+
+#endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP