--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/cpu/x86/c1_FpuStackSim_x86.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2005, 2010, 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 CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP
+#define CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP
+
+//  Simulates the FPU stack and maintains mapping [fpu-register -> stack offset]
+//  FPU registers are described as numbers from 0..nof_fpu_regs-1
+
+class Compilation;
+
+class FpuStackSim VALUE_OBJ_CLASS_SPEC {
+ private:
+  Compilation* _compilation;
+  int          _stack_size;
+  int          _regs[FrameMap::nof_fpu_regs];
+
+  int tos_index() const                        { return _stack_size - 1; }
+
+  int regs_at(int i) const;
+  void set_regs_at(int i, int val);
+  void dec_stack_size();
+  void inc_stack_size();
+
+  // unified bailout support
+  Compilation*  compilation() const              { return _compilation; }
+  void          bailout(const char* msg) const   { compilation()->bailout(msg); }
+  bool          bailed_out() const               { return compilation()->bailed_out(); }
+
+ public:
+  FpuStackSim(Compilation* compilation);
+  void pop ();
+  void pop (int rnr);                          // rnr must be on tos
+  void push(int rnr);
+  void swap(int offset);                       // exchange tos with tos + offset
+  int offset_from_tos(int rnr) const;          // return the offset of the topmost instance of rnr from TOS
+  int  get_slot(int tos_offset) const;         // return the entry at the given offset from TOS
+  void set_slot(int tos_offset, int rnr);      // set the entry at the given offset from TOS
+  void rename(int old_rnr, int new_rnr);       // rename all instances of old_rnr to new_rnr
+  bool contains(int rnr);                      // debugging support only
+  bool is_empty();
+  bool slot_is_empty(int tos_offset);
+  int stack_size() const                       { return _stack_size; }
+  void clear();
+  intArray* write_state();
+  void read_state(intArray* fpu_stack_state);
+
+  void print() PRODUCT_RETURN;
+};
+
+#endif // CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP