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annotate src/share/vm/ci/ciObject.cpp @ 2645:b2c1e959be46
Clean up around BlockBegin / StdEntry.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:34:29 +0200 |
parents | 06f017f7daa7 |
children | 75a99b4f1c98 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/ciObject.hpp" | |
27 #include "ci/ciUtilities.hpp" | |
28 #include "gc_interface/collectedHeap.inline.hpp" | |
29 #include "oops/oop.inline2.hpp" | |
0 | 30 |
31 // ciObject | |
32 // | |
33 // This class represents an oop in the HotSpot virtual machine. | |
34 // Its subclasses are structured in a hierarchy which mirrors | |
35 // an aggregate of the VM's oop and klass hierarchies (see | |
36 // oopHierarchy.hpp). Each instance of ciObject holds a handle | |
37 // to a corresponding oop on the VM side and provides routines | |
38 // for accessing the information in its oop. By using the ciObject | |
39 // hierarchy for accessing oops in the VM, the compiler ensures | |
40 // that it is safe with respect to garbage collection; that is, | |
41 // GC and compilation can proceed independently without | |
42 // interference. | |
43 // | |
44 // Within the VM, the oop and klass hierarchies are separate. | |
45 // The compiler interface does not preserve this separation -- | |
46 // the distinction between `klassOop' and `Klass' are not | |
47 // reflected in the interface and instead the Klass hierarchy | |
48 // is directly modeled as the subclasses of ciKlass. | |
49 | |
50 // ------------------------------------------------------------------ | |
51 // ciObject::ciObject | |
52 ciObject::ciObject(oop o) { | |
53 ASSERT_IN_VM; | |
54 if (ciObjectFactory::is_initialized()) { | |
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55 if (UseC1X) { |
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56 _handle = JNIHandles::make_global(o); |
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57 _temp_global = true; |
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58 } else { |
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59 _handle = JNIHandles::make_local(o); |
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60 } |
0 | 61 } else { |
62 _handle = JNIHandles::make_global(o); | |
63 } | |
64 _klass = NULL; | |
65 _ident = 0; | |
989 | 66 init_flags_from(o); |
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67 _temp_global = false; |
0 | 68 } |
69 | |
70 // ------------------------------------------------------------------ | |
71 // ciObject::ciObject | |
72 // | |
73 ciObject::ciObject(Handle h) { | |
74 ASSERT_IN_VM; | |
75 if (ciObjectFactory::is_initialized()) { | |
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76 if (UseC1X) { |
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77 _handle = JNIHandles::make_global(h); |
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78 _temp_global = true; |
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79 } else { |
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80 _handle = JNIHandles::make_local(h()); |
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81 } |
0 | 82 } else { |
83 _handle = JNIHandles::make_global(h); | |
84 } | |
85 _klass = NULL; | |
86 _ident = 0; | |
989 | 87 init_flags_from(h()); |
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88 _temp_global = false; |
0 | 89 } |
90 | |
91 // ------------------------------------------------------------------ | |
92 // ciObject::ciObject | |
93 // | |
94 // Unloaded klass/method variant. `klass' is the klass of the unloaded | |
95 // klass/method, if that makes sense. | |
96 ciObject::ciObject(ciKlass* klass) { | |
97 ASSERT_IN_VM; | |
98 assert(klass != NULL, "must supply klass"); | |
99 _handle = NULL; | |
100 _klass = klass; | |
101 _ident = 0; | |
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102 _temp_global = false; |
0 | 103 } |
104 | |
105 // ------------------------------------------------------------------ | |
106 // ciObject::ciObject | |
107 // | |
108 // NULL variant. Used only by ciNullObject. | |
109 ciObject::ciObject() { | |
110 ASSERT_IN_VM; | |
111 _handle = NULL; | |
112 _klass = NULL; | |
113 _ident = 0; | |
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114 _temp_global = false; |
0 | 115 } |
116 | |
117 // ------------------------------------------------------------------ | |
118 // ciObject::klass | |
119 // | |
120 // Get the ciKlass of this ciObject. | |
121 ciKlass* ciObject::klass() { | |
122 if (_klass == NULL) { | |
123 if (_handle == NULL) { | |
124 // When both _klass and _handle are NULL, we are dealing | |
125 // with the distinguished instance of ciNullObject. | |
126 // No one should ask it for its klass. | |
127 assert(is_null_object(), "must be null object"); | |
128 ShouldNotReachHere(); | |
129 return NULL; | |
130 } | |
131 | |
132 GUARDED_VM_ENTRY( | |
133 oop o = get_oop(); | |
134 _klass = CURRENT_ENV->get_object(o->klass())->as_klass(); | |
135 ); | |
136 } | |
137 return _klass; | |
138 } | |
139 | |
140 // ------------------------------------------------------------------ | |
141 // ciObject::set_ident | |
142 // | |
143 // Set the unique identity number of a ciObject. | |
144 void ciObject::set_ident(uint id) { | |
145 assert((_ident >> FLAG_BITS) == 0, "must only initialize once"); | |
146 assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big"); | |
147 _ident = _ident + (id << FLAG_BITS); | |
148 } | |
149 | |
150 // ------------------------------------------------------------------ | |
151 // ciObject::ident | |
152 // | |
153 // Report the unique identity number of a ciObject. | |
154 uint ciObject::ident() { | |
155 uint id = _ident >> FLAG_BITS; | |
156 assert(id != 0, "must be initialized"); | |
157 return id; | |
158 } | |
159 | |
160 // ------------------------------------------------------------------ | |
161 // ciObject::equals | |
162 // | |
163 // Are two ciObjects equal? | |
164 bool ciObject::equals(ciObject* obj) { | |
165 return (this == obj); | |
166 } | |
167 | |
168 // ------------------------------------------------------------------ | |
169 // ciObject::hash | |
170 // | |
171 // A hash value for the convenience of compilers. | |
172 // | |
173 // Implementation note: we use the address of the ciObject as the | |
174 // basis for the hash. Use the _ident field, which is well-behaved. | |
175 int ciObject::hash() { | |
176 return ident() * 31; | |
177 } | |
178 | |
179 // ------------------------------------------------------------------ | |
989 | 180 // ciObject::constant_encoding |
0 | 181 // |
182 // The address which the compiler should embed into the | |
183 // generated code to represent this oop. This address | |
184 // is not the true address of the oop -- it will get patched | |
185 // during nmethod creation. | |
186 // | |
187 // | |
188 // | |
189 // Implementation note: we use the handle as the encoding. The | |
190 // nmethod constructor resolves the handle and patches in the oop. | |
191 // | |
192 // This method should be changed to return an generified address | |
193 // to discourage use of the JNI handle. | |
989 | 194 jobject ciObject::constant_encoding() { |
0 | 195 assert(is_null_object() || handle() != NULL, "cannot embed null pointer"); |
989 | 196 assert(can_be_constant(), "oop must be NULL or perm"); |
0 | 197 return handle(); |
198 } | |
199 | |
200 // ------------------------------------------------------------------ | |
989 | 201 // ciObject::can_be_constant |
202 bool ciObject::can_be_constant() { | |
203 if (ScavengeRootsInCode >= 1) return true; // now everybody can encode as a constant | |
204 return handle() == NULL || !is_scavengable(); | |
205 } | |
206 | |
207 // ------------------------------------------------------------------ | |
208 // ciObject::should_be_constant() | |
209 bool ciObject::should_be_constant() { | |
210 if (ScavengeRootsInCode >= 2) return true; // force everybody to be a constant | |
211 return handle() == NULL || !is_scavengable(); | |
0 | 212 } |
213 | |
214 | |
215 // ------------------------------------------------------------------ | |
216 // ciObject::print | |
217 // | |
218 // Print debugging output about this ciObject. | |
219 // | |
220 // Implementation note: dispatch to the virtual print_impl behavior | |
221 // for this ciObject. | |
222 void ciObject::print(outputStream* st) { | |
223 st->print("<%s", type_string()); | |
224 GUARDED_VM_ENTRY(print_impl(st);) | |
989 | 225 st->print(" ident=%d %s%s address=0x%x>", ident(), |
0 | 226 is_perm() ? "PERM" : "", |
989 | 227 is_scavengable() ? "SCAVENGABLE" : "", |
0 | 228 (address)this); |
229 } | |
230 | |
231 // ------------------------------------------------------------------ | |
232 // ciObject::print_oop | |
233 // | |
234 // Print debugging output about the oop this ciObject represents. | |
235 void ciObject::print_oop(outputStream* st) { | |
236 if (is_null_object()) { | |
237 st->print_cr("NULL"); | |
238 } else if (!is_loaded()) { | |
239 st->print_cr("UNLOADED"); | |
240 } else { | |
241 GUARDED_VM_ENTRY(get_oop()->print_on(st);) | |
242 } | |
243 } |