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/*
* Copyright (c) 2005, 2019, 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_C1_FPUSTACKSIM_X86_HPP
#define CPU_X86_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 {
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_C1_FPUSTACKSIM_X86_HPP
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