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