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comparison src/share/vm/runtime/stackValue.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 b109e761e927
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2005 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 class StackValue : public ResourceObj {
26 private:
27 BasicType _type;
28 intptr_t _i; // Blank java stack slot value
29 Handle _o; // Java stack slot value interpreted as a Handle
30 public:
31
32 StackValue(intptr_t value) {
33 _type = T_INT;
34 _i = value;
35 }
36
37 StackValue(Handle value) {
38 _type = T_OBJECT;
39 _o = value;
40 }
41
42 StackValue() {
43 _type = T_CONFLICT;
44 _i = 0;
45 }
46
47 // Only used during deopt- preserve object type.
48 StackValue(intptr_t o, BasicType t) {
49 assert(t == T_OBJECT, "should not be used");
50 _type = t;
51 _i = o;
52 }
53
54 Handle get_obj() const {
55 assert(type() == T_OBJECT, "type check");
56 return _o;
57 }
58
59 void set_obj(Handle value) {
60 assert(type() == T_OBJECT, "type check");
61 _o = value;
62 }
63
64 intptr_t get_int() const {
65 assert(type() == T_INT, "type check");
66 return _i;
67 }
68
69 // For special case in deopt.
70 intptr_t get_int(BasicType t) const {
71 assert(t == T_OBJECT && type() == T_OBJECT, "type check");
72 return _i;
73 }
74
75 void set_int(intptr_t value) {
76 assert(type() == T_INT, "type check");
77 _i = value;
78 }
79
80 BasicType type() const { return _type; }
81
82 bool equal(StackValue *value) {
83 if (_type != value->_type) return false;
84 if (_type == T_OBJECT)
85 return (_o == value->_o);
86 else {
87 assert(_type == T_INT, "sanity check");
88 // [phh] compare only low addressed portions of intptr_t slots
89 return (*(int *)&_i == *(int *)&value->_i);
90 }
91 }
92
93 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv);
94 static BasicLock* resolve_monitor_lock(const frame* fr, Location location);
95
96 #ifndef PRODUCT
97 public:
98 // Printing
99 void print_on(outputStream* st) const;
100 #endif
101 };