1/*
2 * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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23 */
24
25#ifndef CPU_X86_C1_FPUSTACKSIM_X86_HPP
26#define CPU_X86_C1_FPUSTACKSIM_X86_HPP
27
28// Simulates the FPU stack and maintains mapping [fpu-register -> stack offset]
29// FPU registers are described as numbers from 0..nof_fpu_regs-1
30
31class Compilation;
32
33class FpuStackSim {
34 private:
35 Compilation* _compilation;
36 int _stack_size;
37 int _regs[FrameMap::nof_fpu_regs];
38
39 int tos_index() const { return _stack_size - 1; }
40
41 int regs_at(int i) const;
42 void set_regs_at(int i, int val);
43 void dec_stack_size();
44 void inc_stack_size();
45
46 // unified bailout support
47 Compilation* compilation() const { return _compilation; }
48 void bailout(const char* msg) const { compilation()->bailout(msg); }
49 bool bailed_out() const { return compilation()->bailed_out(); }
50
51 public:
52 FpuStackSim(Compilation* compilation);
53 void pop ();
54 void pop (int rnr); // rnr must be on tos
55 void push(int rnr);
56 void swap(int offset); // exchange tos with tos + offset
57 int offset_from_tos(int rnr) const; // return the offset of the topmost instance of rnr from TOS
58 int get_slot(int tos_offset) const; // return the entry at the given offset from TOS
59 void set_slot(int tos_offset, int rnr); // set the entry at the given offset from TOS
60 void rename(int old_rnr, int new_rnr); // rename all instances of old_rnr to new_rnr
61 bool contains(int rnr); // debugging support only
62 bool is_empty();
63 bool slot_is_empty(int tos_offset);
64 int stack_size() const { return _stack_size; }
65 void clear();
66 intArray* write_state();
67 void read_state(intArray* fpu_stack_state);
68
69 void print() PRODUCT_RETURN;
70};
71
72#endif // CPU_X86_C1_FPUSTACKSIM_X86_HPP
73