Mercurial > hg > truffle
annotate src/share/vm/ci/ciObject.cpp @ 1905:ce6848d0666d
6968367: can_post_on_exceptions is still using VM_DeoptimizeFrame in some places
Reviewed-by: kvn, twisti
author | never |
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date | Tue, 19 Oct 2010 16:14:34 -0700 |
parents | c18cbe5936b8 |
children | 2d26b0046e0d f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2007, 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 |
c18cbe5936b8
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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 | |
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; | |
989 | 58 init_flags_from(o); |
0 | 59 } |
60 | |
61 // ------------------------------------------------------------------ | |
62 // ciObject::ciObject | |
63 // | |
64 ciObject::ciObject(Handle h) { | |
65 ASSERT_IN_VM; | |
66 if (ciObjectFactory::is_initialized()) { | |
67 _handle = JNIHandles::make_local(h()); | |
68 } else { | |
69 _handle = JNIHandles::make_global(h); | |
70 } | |
71 _klass = NULL; | |
72 _ident = 0; | |
989 | 73 init_flags_from(h()); |
0 | 74 } |
75 | |
76 // ------------------------------------------------------------------ | |
77 // ciObject::ciObject | |
78 // | |
79 // Unloaded klass/method variant. `klass' is the klass of the unloaded | |
80 // klass/method, if that makes sense. | |
81 ciObject::ciObject(ciKlass* klass) { | |
82 ASSERT_IN_VM; | |
83 assert(klass != NULL, "must supply klass"); | |
84 _handle = NULL; | |
85 _klass = klass; | |
86 _ident = 0; | |
87 } | |
88 | |
89 // ------------------------------------------------------------------ | |
90 // ciObject::ciObject | |
91 // | |
92 // NULL variant. Used only by ciNullObject. | |
93 ciObject::ciObject() { | |
94 ASSERT_IN_VM; | |
95 _handle = NULL; | |
96 _klass = NULL; | |
97 _ident = 0; | |
98 } | |
99 | |
100 // ------------------------------------------------------------------ | |
101 // ciObject::klass | |
102 // | |
103 // Get the ciKlass of this ciObject. | |
104 ciKlass* ciObject::klass() { | |
105 if (_klass == NULL) { | |
106 if (_handle == NULL) { | |
107 // When both _klass and _handle are NULL, we are dealing | |
108 // with the distinguished instance of ciNullObject. | |
109 // No one should ask it for its klass. | |
110 assert(is_null_object(), "must be null object"); | |
111 ShouldNotReachHere(); | |
112 return NULL; | |
113 } | |
114 | |
115 GUARDED_VM_ENTRY( | |
116 oop o = get_oop(); | |
117 _klass = CURRENT_ENV->get_object(o->klass())->as_klass(); | |
118 ); | |
119 } | |
120 return _klass; | |
121 } | |
122 | |
123 // ------------------------------------------------------------------ | |
124 // ciObject::set_ident | |
125 // | |
126 // Set the unique identity number of a ciObject. | |
127 void ciObject::set_ident(uint id) { | |
128 assert((_ident >> FLAG_BITS) == 0, "must only initialize once"); | |
129 assert( id < ((uint)1 << (BitsPerInt-FLAG_BITS)), "id too big"); | |
130 _ident = _ident + (id << FLAG_BITS); | |
131 } | |
132 | |
133 // ------------------------------------------------------------------ | |
134 // ciObject::ident | |
135 // | |
136 // Report the unique identity number of a ciObject. | |
137 uint ciObject::ident() { | |
138 uint id = _ident >> FLAG_BITS; | |
139 assert(id != 0, "must be initialized"); | |
140 return id; | |
141 } | |
142 | |
143 // ------------------------------------------------------------------ | |
144 // ciObject::equals | |
145 // | |
146 // Are two ciObjects equal? | |
147 bool ciObject::equals(ciObject* obj) { | |
148 return (this == obj); | |
149 } | |
150 | |
151 // ------------------------------------------------------------------ | |
152 // ciObject::hash | |
153 // | |
154 // A hash value for the convenience of compilers. | |
155 // | |
156 // Implementation note: we use the address of the ciObject as the | |
157 // basis for the hash. Use the _ident field, which is well-behaved. | |
158 int ciObject::hash() { | |
159 return ident() * 31; | |
160 } | |
161 | |
162 // ------------------------------------------------------------------ | |
989 | 163 // ciObject::constant_encoding |
0 | 164 // |
165 // The address which the compiler should embed into the | |
166 // generated code to represent this oop. This address | |
167 // is not the true address of the oop -- it will get patched | |
168 // during nmethod creation. | |
169 // | |
170 // | |
171 // | |
172 // Implementation note: we use the handle as the encoding. The | |
173 // nmethod constructor resolves the handle and patches in the oop. | |
174 // | |
175 // This method should be changed to return an generified address | |
176 // to discourage use of the JNI handle. | |
989 | 177 jobject ciObject::constant_encoding() { |
0 | 178 assert(is_null_object() || handle() != NULL, "cannot embed null pointer"); |
989 | 179 assert(can_be_constant(), "oop must be NULL or perm"); |
0 | 180 return handle(); |
181 } | |
182 | |
183 // ------------------------------------------------------------------ | |
989 | 184 // ciObject::can_be_constant |
185 bool ciObject::can_be_constant() { | |
186 if (ScavengeRootsInCode >= 1) return true; // now everybody can encode as a constant | |
187 return handle() == NULL || !is_scavengable(); | |
188 } | |
189 | |
190 // ------------------------------------------------------------------ | |
191 // ciObject::should_be_constant() | |
192 bool ciObject::should_be_constant() { | |
193 if (ScavengeRootsInCode >= 2) return true; // force everybody to be a constant | |
194 return handle() == NULL || !is_scavengable(); | |
0 | 195 } |
196 | |
197 | |
198 // ------------------------------------------------------------------ | |
199 // ciObject::print | |
200 // | |
201 // Print debugging output about this ciObject. | |
202 // | |
203 // Implementation note: dispatch to the virtual print_impl behavior | |
204 // for this ciObject. | |
205 void ciObject::print(outputStream* st) { | |
206 st->print("<%s", type_string()); | |
207 GUARDED_VM_ENTRY(print_impl(st);) | |
989 | 208 st->print(" ident=%d %s%s address=0x%x>", ident(), |
0 | 209 is_perm() ? "PERM" : "", |
989 | 210 is_scavengable() ? "SCAVENGABLE" : "", |
0 | 211 (address)this); |
212 } | |
213 | |
214 // ------------------------------------------------------------------ | |
215 // ciObject::print_oop | |
216 // | |
217 // Print debugging output about the oop this ciObject represents. | |
218 void ciObject::print_oop(outputStream* st) { | |
219 if (is_null_object()) { | |
220 st->print_cr("NULL"); | |
221 } else if (!is_loaded()) { | |
222 st->print_cr("UNLOADED"); | |
223 } else { | |
224 GUARDED_VM_ENTRY(get_oop()->print_on(st);) | |
225 } | |
226 } |