Mercurial > hg > truffle
comparison src/share/vm/ci/ciObject.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 148e5441d916 |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:a61af66fc99e |
---|---|
1 /* | |
2 * Copyright 1999-2007 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 #include "incls/_precompiled.incl" | |
26 #include "incls/_ciObject.cpp.incl" | |
27 | |
28 // ciObject | |
29 // | |
30 // This class represents an oop in the HotSpot virtual machine. | |
31 // Its subclasses are structured in a hierarchy which mirrors | |
32 // an aggregate of the VM's oop and klass hierarchies (see | |
33 // oopHierarchy.hpp). Each instance of ciObject holds a handle | |
34 // to a corresponding oop on the VM side and provides routines | |
35 // for accessing the information in its oop. By using the ciObject | |
36 // hierarchy for accessing oops in the VM, the compiler ensures | |
37 // that it is safe with respect to garbage collection; that is, | |
38 // GC and compilation can proceed independently without | |
39 // interference. | |
40 // | |
41 // Within the VM, the oop and klass hierarchies are separate. | |
42 // The compiler interface does not preserve this separation -- | |
43 // the distinction between `klassOop' and `Klass' are not | |
44 // reflected in the interface and instead the Klass hierarchy | |
45 // is directly modeled as the subclasses of ciKlass. | |
46 | |
47 // ------------------------------------------------------------------ | |
48 // ciObject::ciObject | |
49 ciObject::ciObject(oop o) { | |
50 ASSERT_IN_VM; | |
51 if (ciObjectFactory::is_initialized()) { | |
52 _handle = JNIHandles::make_local(o); | |
53 } else { | |
54 _handle = JNIHandles::make_global(o); | |
55 } | |
56 _klass = NULL; | |
57 _ident = 0; | |
58 } | |
59 | |
60 // ------------------------------------------------------------------ | |
61 // ciObject::ciObject | |
62 // | |
63 ciObject::ciObject(Handle h) { | |
64 ASSERT_IN_VM; | |
65 if (ciObjectFactory::is_initialized()) { | |
66 _handle = JNIHandles::make_local(h()); | |
67 } else { | |
68 _handle = JNIHandles::make_global(h); | |
69 } | |
70 _klass = NULL; | |
71 _ident = 0; | |
72 } | |
73 | |
74 // ------------------------------------------------------------------ | |
75 // ciObject::ciObject | |
76 // | |
77 // Unloaded klass/method variant. `klass' is the klass of the unloaded | |
78 // klass/method, if that makes sense. | |
79 ciObject::ciObject(ciKlass* klass) { | |
80 ASSERT_IN_VM; | |
81 assert(klass != NULL, "must supply klass"); | |
82 _handle = NULL; | |
83 _klass = klass; | |
84 _ident = 0; | |
85 } | |
86 | |
87 // ------------------------------------------------------------------ | |
88 // ciObject::ciObject | |
89 // | |
90 // NULL variant. Used only by ciNullObject. | |
91 ciObject::ciObject() { | |
92 ASSERT_IN_VM; | |
93 _handle = NULL; | |
94 _klass = NULL; | |
95 _ident = 0; | |
96 } | |
97 | |
98 // ------------------------------------------------------------------ | |
99 // ciObject::klass | |
100 // | |
101 // Get the ciKlass of this ciObject. | |
102 ciKlass* ciObject::klass() { | |
103 if (_klass == NULL) { | |
104 if (_handle == NULL) { | |
105 // When both _klass and _handle are NULL, we are dealing | |
106 // with the distinguished instance of ciNullObject. | |
107 // No one should ask it for its klass. | |
108 assert(is_null_object(), "must be null object"); | |
109 ShouldNotReachHere(); | |
110 return NULL; | |
111 } | |
112 | |
113 GUARDED_VM_ENTRY( | |
114 oop o = get_oop(); | |
115 _klass = CURRENT_ENV->get_object(o->klass())->as_klass(); | |
116 ); | |
117 } | |
118 return _klass; | |
119 } | |
120 | |
121 // ------------------------------------------------------------------ | |
122 // ciObject::set_ident | |
123 // | |
124 // Set the unique identity number of a ciObject. | |
125 void ciObject::set_ident(uint id) { | |
126 assert((_ident >> FLAG_BITS) == 0, "must only initialize once"); | |
127 assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big"); | |
128 _ident = _ident + (id << FLAG_BITS); | |
129 } | |
130 | |
131 // ------------------------------------------------------------------ | |
132 // ciObject::ident | |
133 // | |
134 // Report the unique identity number of a ciObject. | |
135 uint ciObject::ident() { | |
136 uint id = _ident >> FLAG_BITS; | |
137 assert(id != 0, "must be initialized"); | |
138 return id; | |
139 } | |
140 | |
141 // ------------------------------------------------------------------ | |
142 // ciObject::equals | |
143 // | |
144 // Are two ciObjects equal? | |
145 bool ciObject::equals(ciObject* obj) { | |
146 return (this == obj); | |
147 } | |
148 | |
149 // ------------------------------------------------------------------ | |
150 // ciObject::hash | |
151 // | |
152 // A hash value for the convenience of compilers. | |
153 // | |
154 // Implementation note: we use the address of the ciObject as the | |
155 // basis for the hash. Use the _ident field, which is well-behaved. | |
156 int ciObject::hash() { | |
157 return ident() * 31; | |
158 } | |
159 | |
160 // ------------------------------------------------------------------ | |
161 // ciObject::encoding | |
162 // | |
163 // The address which the compiler should embed into the | |
164 // generated code to represent this oop. This address | |
165 // is not the true address of the oop -- it will get patched | |
166 // during nmethod creation. | |
167 // | |
168 // | |
169 // | |
170 // Implementation note: we use the handle as the encoding. The | |
171 // nmethod constructor resolves the handle and patches in the oop. | |
172 // | |
173 // This method should be changed to return an generified address | |
174 // to discourage use of the JNI handle. | |
175 jobject ciObject::encoding() { | |
176 assert(is_null_object() || handle() != NULL, "cannot embed null pointer"); | |
177 assert(has_encoding(), "oop must be NULL or perm"); | |
178 return handle(); | |
179 } | |
180 | |
181 // ------------------------------------------------------------------ | |
182 // ciObject::has_encoding | |
183 bool ciObject::has_encoding() { | |
184 return handle() == NULL || is_perm(); | |
185 } | |
186 | |
187 | |
188 // ------------------------------------------------------------------ | |
189 // ciObject::print | |
190 // | |
191 // Print debugging output about this ciObject. | |
192 // | |
193 // Implementation note: dispatch to the virtual print_impl behavior | |
194 // for this ciObject. | |
195 void ciObject::print(outputStream* st) { | |
196 st->print("<%s", type_string()); | |
197 GUARDED_VM_ENTRY(print_impl(st);) | |
198 st->print(" ident=%d %s address=0x%x>", ident(), | |
199 is_perm() ? "PERM" : "", | |
200 (address)this); | |
201 } | |
202 | |
203 // ------------------------------------------------------------------ | |
204 // ciObject::print_oop | |
205 // | |
206 // Print debugging output about the oop this ciObject represents. | |
207 void ciObject::print_oop(outputStream* st) { | |
208 if (is_null_object()) { | |
209 st->print_cr("NULL"); | |
210 } else if (!is_loaded()) { | |
211 st->print_cr("UNLOADED"); | |
212 } else { | |
213 GUARDED_VM_ENTRY(get_oop()->print_on(st);) | |
214 } | |
215 } |