diff --git a/src/hotspot/share/gc/shared/c1/barrierSetC1.hpp b/src/hotspot/share/gc/shared/c1/barrierSetC1.hpp
new file mode 100644
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+++ b/src/hotspot/share/gc/shared/c1/barrierSetC1.hpp
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+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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_GC_SHARED_C1_BARRIERSETC1_HPP
+#define SHARE_GC_SHARED_C1_BARRIERSETC1_HPP
+
+#include "c1/c1_Decorators.hpp"
+#include "c1/c1_LIRGenerator.hpp"
+#include "c1/c1_Instruction.hpp"
+#include "c1/c1_LIR.hpp"
+#include "memory/allocation.hpp"
+
+class LIRGenerator;
+class LIRItem;
+
+// The LIRAddressOpr comprises either a LIRItem or a LIR_Opr to describe elements
+// of an access in the C1 Access API. Both of them allow asking for the opr() which
+// will correspond to either _item.result() or _opr if there is no _item.
+class LIRAddressOpr: public StackObj {
+  LIRItem* _item;
+  LIR_Opr  _opr;
+public:
+  LIRAddressOpr(LIRItem& item) : _item(&item), _opr(NULL) {}
+  LIRAddressOpr(LIR_Opr opr) : _item(NULL), _opr(opr) {}
+  LIRAddressOpr(const LIRAddressOpr& other) : _item(other._item), _opr(other._opr) {}
+
+  LIRItem& item() const {
+    assert(_item != NULL, "sanity");
+    return *_item;
+  }
+
+  LIR_Opr opr() const {
+    if (_item == NULL) {
+      return _opr;
+    } else {
+      return _item->result();
+    }
+  }
+};
+
+// The LIRAccess class wraps shared context parameters required for performing
+// the right access in C1. This includes the address of the offset and the decorators.
+class LIRAccess: public StackObj {
+  LIRGenerator* _gen;
+  DecoratorSet  _decorators;
+  LIRAddressOpr _base;
+  LIRAddressOpr _offset;
+  BasicType     _type;
+  LIR_Opr       _resolved_addr;
+  CodeEmitInfo* _patch_info;
+  CodeEmitInfo* _access_emit_info;
+
+public:
+  LIRAccess(LIRGenerator* gen, DecoratorSet decorators,
+            LIRAddressOpr base, LIRAddressOpr offset, BasicType type,
+            CodeEmitInfo* patch_info = NULL, CodeEmitInfo* access_emit_info = NULL) :
+    _gen(gen),
+    _decorators(AccessInternal::decorator_fixup(decorators)),
+    _base(base),
+    _offset(offset),
+    _type(type),
+    _resolved_addr(NULL),
+    _patch_info(patch_info),
+    _access_emit_info(access_emit_info) {}
+
+  void load_base()   { _base.item().load_item(); }
+  void load_offset() { _offset.item().load_nonconstant(); }
+
+  void load_address() {
+    load_base();
+    load_offset();
+  }
+
+  LIRGenerator* gen() const            { return _gen; }
+  CodeEmitInfo*& patch_info()          { return _patch_info; }
+  CodeEmitInfo*& access_emit_info()    { return _access_emit_info; }
+  LIRAddressOpr& base()                { return _base; }
+  LIRAddressOpr& offset()              { return _offset; }
+  BasicType type() const               { return _type; }
+  LIR_Opr resolved_addr() const        { return _resolved_addr; }
+  void set_resolved_addr(LIR_Opr addr) { _resolved_addr = addr; }
+  bool is_oop() const                  { return _type == T_ARRAY || _type == T_OBJECT; }
+  DecoratorSet decorators() const      { return _decorators; }
+  bool is_raw() const                  { return (_decorators & AS_RAW) != 0; }
+};
+
+// The BarrierSetC1 class is the main entry point for the GC backend of the Access API in C1.
+// It is called by the LIRGenerator::access_* functions, which is the main entry poing for
+// access calls in C1.
+
+class BarrierSetC1: public CHeapObj<mtGC> {
+protected:
+  virtual LIR_Opr resolve_address(LIRAccess& access, bool resolve_in_register);
+
+  virtual void generate_referent_check(LIRAccess& access, LabelObj* cont);
+
+  // Accesses with resolved address
+  virtual void store_at_resolved(LIRAccess& access, LIR_Opr value);
+  virtual void load_at_resolved(LIRAccess& access, LIR_Opr result);
+
+  virtual LIR_Opr atomic_cmpxchg_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value);
+
+  virtual LIR_Opr atomic_xchg_resolved(LIRAccess& access, LIRItem& value);
+  virtual LIR_Opr atomic_add_at_resolved(LIRAccess& access, LIRItem& value);
+
+public:
+  virtual void store_at(LIRAccess& access, LIR_Opr value);
+  virtual void load_at(LIRAccess& access, LIR_Opr result);
+
+  virtual LIR_Opr atomic_cmpxchg_at(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value);
+
+  virtual LIR_Opr atomic_xchg(LIRAccess& access, LIRItem& value);
+  virtual LIR_Opr atomic_add_at(LIRAccess& access, LIRItem& value);
+
+  virtual void generate_c1_runtime_stubs(BufferBlob* buffer_blob) {}
+};
+
+#endif // SHARE_GC_SHARED_C1_BARRIERSETC1_HPP