--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/epsilon/epsilonHeap.hpp	Tue Jun 12 15:03:00 2018 +0200
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2017, 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_EPSILON_COLLECTEDHEAP_HPP
+#define SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP
+
+#include "gc/shared/collectedHeap.hpp"
+#include "gc/shared/softRefPolicy.hpp"
+#include "gc/shared/space.hpp"
+#include "services/memoryManager.hpp"
+#include "gc/epsilon/epsilonCollectorPolicy.hpp"
+#include "gc/epsilon/epsilonMonitoringSupport.hpp"
+#include "gc/epsilon/epsilonBarrierSet.hpp"
+#include "gc/epsilon/epsilon_globals.hpp"
+
+class EpsilonHeap : public CollectedHeap {
+  friend class VMStructs;
+private:
+  EpsilonCollectorPolicy* _policy;
+  SoftRefPolicy _soft_ref_policy;
+  EpsilonMonitoringSupport* _monitoring_support;
+  MemoryPool* _pool;
+  GCMemoryManager _memory_manager;
+  ContiguousSpace* _space;
+  VirtualSpace _virtual_space;
+  size_t _max_tlab_size;
+  size_t _step_counter_update;
+  size_t _step_heap_print;
+  int64_t _decay_time_ns;
+  volatile size_t _last_counter_update;
+  volatile size_t _last_heap_print;
+
+public:
+  static EpsilonHeap* heap();
+
+  EpsilonHeap(EpsilonCollectorPolicy* p) :
+          _policy(p),
+          _memory_manager("Epsilon Heap", "") {};
+
+  virtual Name kind() const {
+    return CollectedHeap::Epsilon;
+  }
+
+  virtual const char* name() const {
+    return "Epsilon";
+  }
+
+  virtual CollectorPolicy* collector_policy() const {
+    return _policy;
+  }
+
+  virtual SoftRefPolicy* soft_ref_policy() {
+    return &_soft_ref_policy;
+  }
+
+  virtual jint initialize();
+  virtual void post_initialize();
+  virtual void initialize_serviceability();
+
+  virtual GrowableArray<GCMemoryManager*> memory_managers();
+  virtual GrowableArray<MemoryPool*> memory_pools();
+
+  virtual size_t max_capacity() const { return _virtual_space.reserved_size();  }
+  virtual size_t capacity()     const { return _virtual_space.committed_size(); }
+  virtual size_t used()         const { return _space->used(); }
+
+  virtual bool is_in(const void* p) const {
+    return _space->is_in(p);
+  }
+
+  virtual bool is_scavengable(oop obj) {
+    // No GC is going to happen, therefore no objects ever move.
+    return false;
+  }
+
+  virtual bool is_maximal_no_gc() const {
+    // No GC is going to happen. Return "we are at max", when we are about to fail.
+    return used() == capacity();
+  }
+
+  // Allocation
+  HeapWord* allocate_work(size_t size);
+  virtual HeapWord* mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded);
+  virtual HeapWord* allocate_new_tlab(size_t min_size,
+                                      size_t requested_size,
+                                      size_t* actual_size);
+
+  // TLAB allocation
+  virtual bool supports_tlab_allocation()           const { return true;           }
+  virtual size_t tlab_capacity(Thread* thr)         const { return capacity();     }
+  virtual size_t tlab_used(Thread* thr)             const { return used();         }
+  virtual size_t max_tlab_size()                    const { return _max_tlab_size; }
+  virtual size_t unsafe_max_tlab_alloc(Thread* thr) const;
+
+  virtual void collect(GCCause::Cause cause);
+  virtual void do_full_collection(bool clear_all_soft_refs);
+
+  // Heap walking support
+  virtual void safe_object_iterate(ObjectClosure* cl);
+  virtual void object_iterate(ObjectClosure* cl) {
+    safe_object_iterate(cl);
+  }
+
+  // No support for block parsing.
+  virtual HeapWord* block_start(const void* addr) const { return NULL;  }
+  virtual size_t block_size(const HeapWord* addr) const { return 0;     }
+  virtual bool block_is_obj(const HeapWord* addr) const { return false; }
+
+  // No GC threads
+  virtual void print_gc_threads_on(outputStream* st) const {}
+  virtual void gc_threads_do(ThreadClosure* tc) const {}
+
+  // No heap verification
+  virtual void prepare_for_verify() {}
+  virtual void verify(VerifyOption option) {}
+
+  virtual jlong millis_since_last_gc() {
+    // Report time since the VM start
+    return os::elapsed_counter() / NANOSECS_PER_MILLISEC;
+  }
+
+  virtual void print_on(outputStream* st) const;
+  virtual void print_tracing_info() const;
+
+};
+
+#endif // SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP