Wed, 13 Jan 2010 23:05:52 -0800
6912065: final fields in objects need to support inlining optimizations for JSR 292
Reviewed-by: twisti, kvn
1 /*
2 * Copyright 1997-2009 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 */
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:
32 StackValue(intptr_t value) {
33 _type = T_INT;
34 _i = value;
35 }
37 StackValue(Handle value, intptr_t scalar_replaced = 0) {
38 _type = T_OBJECT;
39 _i = scalar_replaced;
40 _o = value;
41 assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced");
42 }
44 StackValue() {
45 _type = T_CONFLICT;
46 _i = 0;
47 }
49 // Only used during deopt- preserve object type.
50 StackValue(intptr_t o, BasicType t) {
51 assert(t == T_OBJECT, "should not be used");
52 _type = t;
53 _i = o;
54 }
56 Handle get_obj() const {
57 assert(type() == T_OBJECT, "type check");
58 return _o;
59 }
61 bool obj_is_scalar_replaced() const {
62 assert(type() == T_OBJECT, "type check");
63 return _i != 0;
64 }
66 void set_obj(Handle value) {
67 assert(type() == T_OBJECT, "type check");
68 _o = value;
69 }
71 intptr_t get_int() const {
72 assert(type() == T_INT, "type check");
73 return _i;
74 }
76 // For special case in deopt.
77 intptr_t get_int(BasicType t) const {
78 assert(t == T_OBJECT && type() == T_OBJECT, "type check");
79 return _i;
80 }
82 void set_int(intptr_t value) {
83 assert(type() == T_INT, "type check");
84 _i = value;
85 }
87 BasicType type() const { return _type; }
89 bool equal(StackValue *value) {
90 if (_type != value->_type) return false;
91 if (_type == T_OBJECT)
92 return (_o == value->_o);
93 else {
94 assert(_type == T_INT, "sanity check");
95 // [phh] compare only low addressed portions of intptr_t slots
96 return (*(int *)&_i == *(int *)&value->_i);
97 }
98 }
100 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv);
101 static BasicLock* resolve_monitor_lock(const frame* fr, Location location);
103 #ifndef PRODUCT
104 public:
105 // Printing
106 void print_on(outputStream* st) const;
107 #endif
108 };