--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/stubCodeGenerator.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 1997, 2015, 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_RUNTIME_STUBCODEGENERATOR_HPP
+#define SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP
+
+#include "asm/assembler.hpp"
+#include "memory/allocation.hpp"
+
+// All the basic framework for stub code generation/debugging/printing.
+
+
+// A StubCodeDesc describes a piece of generated code (usually stubs).
+// This information is mainly useful for debugging and printing.
+// Currently, code descriptors are simply chained in a linked list,
+// this may have to change if searching becomes too slow.
+
+class StubCodeDesc: public CHeapObj<mtCode> {
+ private:
+  static StubCodeDesc* _list;                  // the list of all descriptors
+  static bool          _frozen;                // determines whether _list modifications are allowed
+
+  StubCodeDesc*        _next;                  // the next element in the linked list
+  const char*          _group;                 // the group to which the stub code belongs
+  const char*          _name;                  // the name assigned to the stub code
+  address              _begin;                 // points to the first byte of the stub code    (included)
+  address              _end;                   // points to the first byte after the stub code (excluded)
+
+  void set_end(address end) {
+    assert(_begin <= end, "begin & end not properly ordered");
+    _end = end;
+  }
+
+  void set_begin(address begin) {
+    assert(begin >= _begin, "begin may not decrease");
+    assert(_end == NULL || begin <= _end, "begin & end not properly ordered");
+    _begin = begin;
+  }
+
+  friend class StubCodeMark;
+  friend class StubCodeGenerator;
+
+ public:
+  static StubCodeDesc* first() { return _list; }
+  static StubCodeDesc* next(StubCodeDesc* desc)  { return desc->_next; }
+
+  static StubCodeDesc* desc_for(address pc);     // returns the code descriptor for the code containing pc or NULL
+  static const char*   name_for(address pc);     // returns the name of the code containing pc or NULL
+
+  StubCodeDesc(const char* group, const char* name, address begin, address end = NULL) {
+    assert(!_frozen, "no modifications allowed");
+    assert(name != NULL, "no name specified");
+    _next           = _list;
+    _group          = group;
+    _name           = name;
+    _begin          = begin;
+    _end            = end;
+    _list           = this;
+  };
+
+  static void freeze();
+
+  const char* group() const                      { return _group; }
+  const char* name() const                       { return _name; }
+  address     begin() const                      { return _begin; }
+  address     end() const                        { return _end; }
+  int         size_in_bytes() const              { return _end - _begin; }
+  bool        contains(address pc) const         { return _begin <= pc && pc < _end; }
+  void        print_on(outputStream* st) const;
+  void        print() const                      { print_on(tty); }
+};
+
+// The base class for all stub-generating code generators.
+// Provides utility functions.
+
+class StubCodeGenerator: public StackObj {
+ private:
+  bool _print_code;
+
+ protected:
+  MacroAssembler*  _masm;
+
+ public:
+  StubCodeGenerator(CodeBuffer* code, bool print_code = false);
+  ~StubCodeGenerator();
+
+  MacroAssembler* assembler() const              { return _masm; }
+
+  virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor
+  virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor
+};
+
+
+// Stack-allocated helper class used to associate a stub code with a name.
+// All stub code generating functions that use a StubCodeMark will be registered
+// in the global StubCodeDesc list and the generated stub code can be identified
+// later via an address pointing into it.
+
+class StubCodeMark: public StackObj {
+ private:
+  StubCodeGenerator* _cgen;
+  StubCodeDesc*      _cdesc;
+
+ public:
+  StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name);
+  ~StubCodeMark();
+
+};
+
+#endif // SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP