--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/code/scopeDesc.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 1997, 2016, 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_VM_CODE_SCOPEDESC_HPP
+#define SHARE_VM_CODE_SCOPEDESC_HPP
+
+#include "code/debugInfo.hpp"
+#include "code/pcDesc.hpp"
+#include "oops/method.hpp"
+#include "utilities/growableArray.hpp"
+
+// SimpleScopeDesc is used when all you need to extract from
+// a given pc,nmethod pair is a Method* and a bci. This is
+// quite a bit faster than allocating a full ScopeDesc, but
+// very limited in abilities.
+
+class SimpleScopeDesc : public StackObj {
+ private:
+  Method* _method;
+  int _bci;
+
+ public:
+  SimpleScopeDesc(CompiledMethod* code, address pc) {
+    PcDesc* pc_desc = code->pc_desc_at(pc);
+    assert(pc_desc != NULL, "Must be able to find matching PcDesc");
+    DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());
+    int ignore_sender = buffer.read_int();
+    _method           = buffer.read_method();
+    _bci              = buffer.read_bci();
+  }
+
+  Method* method() { return _method; }
+  int bci() { return _bci; }
+};
+
+// ScopeDescs contain the information that makes source-level debugging of
+// nmethods possible; each scopeDesc describes a method activation
+
+class ScopeDesc : public ResourceObj {
+ public:
+  // Constructor
+  ScopeDesc(const CompiledMethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool rethrow_exception, bool return_oop);
+
+  // Calls above, giving default value of "serialized_null" to the
+  // "obj_decode_offset" argument.  (We don't use a default argument to
+  // avoid a .hpp-.hpp dependency.)
+  ScopeDesc(const CompiledMethod* code, int decode_offset, bool reexecute, bool rethrow_exception, bool return_oop);
+
+  // JVM state
+  Method* method()      const { return _method; }
+  int          bci()      const { return _bci;    }
+  bool should_reexecute() const { return _reexecute; }
+  bool rethrow_exception() const { return _rethrow_exception; }
+  bool return_oop()       const { return _return_oop; }
+
+  GrowableArray<ScopeValue*>*   locals();
+  GrowableArray<ScopeValue*>*   expressions();
+  GrowableArray<MonitorValue*>* monitors();
+  GrowableArray<ScopeValue*>*   objects();
+
+  // Stack walking, returns NULL if this is the outer most scope.
+  ScopeDesc* sender() const;
+
+  // Returns where the scope was decoded
+  int decode_offset() const { return _decode_offset; }
+
+  // Tells whether sender() returns NULL
+  bool is_top() const;
+
+ private:
+  // Alternative constructor
+  ScopeDesc(const ScopeDesc* parent);
+
+  // JVM state
+  Method*       _method;
+  int           _bci;
+  bool          _reexecute;
+  bool          _rethrow_exception;
+  bool          _return_oop;
+
+  // Decoding offsets
+  int _decode_offset;
+  int _sender_decode_offset;
+  int _locals_decode_offset;
+  int _expressions_decode_offset;
+  int _monitors_decode_offset;
+
+  // Object pool
+  GrowableArray<ScopeValue*>* _objects;
+
+  // Nmethod information
+  const CompiledMethod* _code;
+
+  // Decoding operations
+  void decode_body();
+  GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);
+  GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);
+  GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);
+
+  DebugInfoReadStream* stream_at(int decode_offset) const;
+
+
+ public:
+  // Verification
+  void verify();
+
+#ifndef PRODUCT
+ public:
+  // Printing support
+  void print_on(outputStream* st) const;
+  void print_on(outputStream* st, PcDesc* pd) const;
+  void print_value_on(outputStream* st) const;
+#endif
+};
+
+#endif // SHARE_VM_CODE_SCOPEDESC_HPP