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comparison src/cpu/x86/vm/c1_FpuStackSim_x86.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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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
28 class Compilation;
29
30 class 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 };