src/hotspot/cpu/x86/c1_FpuStackSim_x86.hpp
author jwilhelm
Tue, 30 Jan 2018 16:41:40 +0100
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/*
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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP
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#define CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP
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//  Simulates the FPU stack and maintains mapping [fpu-register -> stack offset]
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//  FPU registers are described as numbers from 0..nof_fpu_regs-1
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class Compilation;
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class FpuStackSim VALUE_OBJ_CLASS_SPEC {
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 private:
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  Compilation* _compilation;
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  int          _stack_size;
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  int          _regs[FrameMap::nof_fpu_regs];
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  int tos_index() const                        { return _stack_size - 1; }
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  int regs_at(int i) const;
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  void set_regs_at(int i, int val);
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  void dec_stack_size();
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  void inc_stack_size();
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  // unified bailout support
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  Compilation*  compilation() const              { return _compilation; }
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  void          bailout(const char* msg) const   { compilation()->bailout(msg); }
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  bool          bailed_out() const               { return compilation()->bailed_out(); }
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 public:
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  FpuStackSim(Compilation* compilation);
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  void pop ();
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  void pop (int rnr);                          // rnr must be on tos
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  void push(int rnr);
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  void swap(int offset);                       // exchange tos with tos + offset
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  int offset_from_tos(int rnr) const;          // return the offset of the topmost instance of rnr from TOS
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  int  get_slot(int tos_offset) const;         // return the entry at the given offset from TOS
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  void set_slot(int tos_offset, int rnr);      // set the entry at the given offset from TOS
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  void rename(int old_rnr, int new_rnr);       // rename all instances of old_rnr to new_rnr
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  bool contains(int rnr);                      // debugging support only
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  bool is_empty();
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  bool slot_is_empty(int tos_offset);
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  int stack_size() const                       { return _stack_size; }
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  void clear();
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  intArray* write_state();
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  void read_state(intArray* fpu_stack_state);
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  void print() PRODUCT_RETURN;
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};
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#endif // CPU_X86_VM_C1_FPUSTACKSIM_X86_HPP