c1_FpuStackSim_x86.hpp revision 0:a61af66fc99e 
1/*
2 * Copyright 2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25//  Simulates the FPU stack and maintains mapping [fpu-register -> stack offset]
26//  FPU registers are described as numbers from 0..nof_fpu_regs-1
27
28class Compilation;
29
30class FpuStackSim VALUE_OBJ_CLASS_SPEC {
31 private:
32  Compilation* _compilation;
33  int          _stack_size;
34  int          _regs[FrameMap::nof_fpu_regs];
35
36  int tos_index() const                        { return _stack_size - 1; }
37
38  int regs_at(int i) const;
39  void set_regs_at(int i, int val);
40  void dec_stack_size();
41  void inc_stack_size();
42
43  // unified bailout support
44  Compilation*  compilation() const              { return _compilation; }
45  void          bailout(const char* msg) const   { compilation()->bailout(msg); }
46  bool          bailed_out() const               { return compilation()->bailed_out(); }
47
48 public:
49  FpuStackSim(Compilation* compilation);
50  void pop ();
51  void pop (int rnr);                          // rnr must be on tos
52  void push(int rnr);
53  void swap(int offset);                       // exchange tos with tos + offset
54  int offset_from_tos(int rnr) const;          // return the offset of the topmost instance of rnr from TOS
55  int  get_slot(int tos_offset) const;         // return the entry at the given offset from TOS
56  void set_slot(int tos_offset, int rnr);      // set the entry at the given offset from TOS
57  void rename(int old_rnr, int new_rnr);       // rename all instances of old_rnr to new_rnr
58  bool contains(int rnr);                      // debugging support only
59  bool is_empty();
60  bool slot_is_empty(int tos_offset);
61  int stack_size() const                       { return _stack_size; }
62  void clear();
63  intArray* write_state();
64  void read_state(intArray* fpu_stack_state);
65
66  void print() PRODUCT_RETURN;
67};
68