Mercurial > hg > graal-compiler
annotate src/share/vm/oops/klassVtable.cpp @ 1649:a528509c992b
6968336: VM crash guarantee(!nm->is_zombie()) failed: cannot lock a zombie method
Reviewed-by: twisti
author | never |
---|---|
date | Thu, 15 Jul 2010 08:54:48 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
---|---|
0 | 1 /* |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1490
diff
changeset
|
2 * Copyright (c) 1997, 2009, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1490
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1490
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1490
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_klassVtable.cpp.incl" | |
27 | |
28 inline instanceKlass* klassVtable::ik() const { | |
29 Klass* k = _klass()->klass_part(); | |
30 assert(k->oop_is_instance(), "not an instanceKlass"); | |
31 return (instanceKlass*)k; | |
32 } | |
33 | |
34 | |
35 // this function computes the vtable size (including the size needed for miranda | |
36 // methods) and the number of miranda methods in this class | |
37 // Note on Miranda methods: Let's say there is a class C that implements | |
38 // interface I. Let's say there is a method m in I that neither C nor any | |
39 // of its super classes implement (i.e there is no method of any access, with | |
40 // the same name and signature as m), then m is a Miranda method which is | |
41 // entered as a public abstract method in C's vtable. From then on it should | |
42 // treated as any other public method in C for method over-ride purposes. | |
43 void klassVtable::compute_vtable_size_and_num_mirandas(int &vtable_length, | |
44 int &num_miranda_methods, | |
45 klassOop super, | |
46 objArrayOop methods, | |
47 AccessFlags class_flags, | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
48 Handle classloader, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
49 symbolHandle classname, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
50 objArrayOop local_interfaces, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
51 TRAPS |
0 | 52 ) { |
53 | |
54 No_Safepoint_Verifier nsv; | |
55 | |
56 // set up default result values | |
57 vtable_length = 0; | |
58 num_miranda_methods = 0; | |
59 | |
60 // start off with super's vtable length | |
61 instanceKlass* sk = (instanceKlass*)super->klass_part(); | |
62 vtable_length = super == NULL ? 0 : sk->vtable_length(); | |
63 | |
64 // go thru each method in the methods table to see if it needs a new entry | |
65 int len = methods->length(); | |
66 for (int i = 0; i < len; i++) { | |
67 assert(methods->obj_at(i)->is_method(), "must be a methodOop"); | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
68 methodHandle mh(THREAD, methodOop(methods->obj_at(i))); |
0 | 69 |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
70 if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
0 | 71 vtable_length += vtableEntry::size(); // we need a new entry |
72 } | |
73 } | |
74 | |
75 // compute the number of mirandas methods that must be added to the end | |
76 num_miranda_methods = get_num_mirandas(super, methods, local_interfaces); | |
77 vtable_length += (num_miranda_methods * vtableEntry::size()); | |
78 | |
79 if (Universe::is_bootstrapping() && vtable_length == 0) { | |
80 // array classes don't have their superclass set correctly during | |
81 // bootstrapping | |
82 vtable_length = Universe::base_vtable_size(); | |
83 } | |
84 | |
85 if (super == NULL && !Universe::is_bootstrapping() && | |
86 vtable_length != Universe::base_vtable_size()) { | |
87 // Someone is attempting to redefine java.lang.Object incorrectly. The | |
88 // only way this should happen is from | |
89 // SystemDictionary::resolve_from_stream(), which will detect this later | |
90 // and throw a security exception. So don't assert here to let | |
91 // the exception occur. | |
92 vtable_length = Universe::base_vtable_size(); | |
93 } | |
94 assert(super != NULL || vtable_length == Universe::base_vtable_size(), | |
95 "bad vtable size for class Object"); | |
96 assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); | |
97 assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); | |
98 } | |
99 | |
100 int klassVtable::index_of(methodOop m, int len) const { | |
101 assert(m->vtable_index() >= 0, "do not ask this of non-vtable methods"); | |
102 return m->vtable_index(); | |
103 } | |
104 | |
105 int klassVtable::initialize_from_super(KlassHandle super) { | |
106 if (super.is_null()) { | |
107 return 0; | |
108 } else { | |
109 // copy methods from superKlass | |
110 // can't inherit from array class, so must be instanceKlass | |
111 assert(super->oop_is_instance(), "must be instance klass"); | |
112 instanceKlass* sk = (instanceKlass*)super()->klass_part(); | |
113 klassVtable* superVtable = sk->vtable(); | |
114 assert(superVtable->length() <= _length, "vtable too short"); | |
115 #ifdef ASSERT | |
116 superVtable->verify(tty, true); | |
117 #endif | |
118 superVtable->copy_vtable_to(table()); | |
119 #ifndef PRODUCT | |
120 if (PrintVtables && Verbose) { | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
121 ResourceMark rm; |
0 | 122 tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
123 } | |
124 #endif | |
125 return superVtable->length(); | |
126 } | |
127 } | |
128 | |
129 // Revised lookup semantics introduced 1.3 (Kestral beta) | |
130 void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { | |
131 | |
132 // Note: Arrays can have intermediate array supers. Use java_super to skip them. | |
133 KlassHandle super (THREAD, klass()->java_super()); | |
134 int nofNewEntries = 0; | |
135 | |
136 | |
137 if (PrintVtables && !klass()->oop_is_array()) { | |
138 ResourceMark rm(THREAD); | |
139 tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); | |
140 } | |
141 | |
142 #ifdef ASSERT | |
143 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
144 oop* end_of_vtable = (oop*)&table()[_length]; | |
145 assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); | |
146 #endif | |
147 | |
148 if (Universe::is_bootstrapping()) { | |
149 // just clear everything | |
150 for (int i = 0; i < _length; i++) table()[i].clear(); | |
151 return; | |
152 } | |
153 | |
154 int super_vtable_len = initialize_from_super(super); | |
155 if (klass()->oop_is_array()) { | |
156 assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); | |
157 } else { | |
158 assert(_klass->oop_is_instance(), "must be instanceKlass"); | |
159 | |
160 objArrayHandle methods(THREAD, ik()->methods()); | |
161 int len = methods()->length(); | |
162 int initialized = super_vtable_len; | |
163 | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
164 // update_inherited_vtable can stop for gc - ensure using handles |
0 | 165 for (int i = 0; i < len; i++) { |
166 HandleMark hm(THREAD); | |
167 assert(methods()->obj_at(i)->is_method(), "must be a methodOop"); | |
168 methodHandle mh(THREAD, (methodOop)methods()->obj_at(i)); | |
169 | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
170 bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, checkconstraints, CHECK); |
0 | 171 |
172 if (needs_new_entry) { | |
173 put_method_at(mh(), initialized); | |
174 mh()->set_vtable_index(initialized); // set primary vtable index | |
175 initialized++; | |
176 } | |
177 } | |
178 | |
179 // add miranda methods; it will also update the value of initialized | |
180 fill_in_mirandas(initialized); | |
181 | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
182 // In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
0 | 183 // package_private -> publicprotected), the vtable might actually be smaller than our initial |
184 // calculation. | |
185 assert(initialized <= _length, "vtable initialization failed"); | |
186 for(;initialized < _length; initialized++) { | |
187 put_method_at(NULL, initialized); | |
188 } | |
189 NOT_PRODUCT(verify(tty, true)); | |
190 } | |
191 } | |
192 | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
193 // Called for cases where a method does not override its superclass' vtable entry |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
194 // For bytecodes not produced by javac together it is possible that a method does not override |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
195 // the superclass's method, but might indirectly override a super-super class's vtable entry |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
196 // If none found, return a null superk, else return the superk of the method this does override |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
197 instanceKlass* klassVtable::find_transitive_override(instanceKlass* initialsuper, methodHandle target_method, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
198 int vtable_index, Handle target_loader, symbolHandle target_classname, Thread * THREAD) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
199 instanceKlass* superk = initialsuper; |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
200 while (superk != NULL && superk->super() != NULL) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
201 instanceKlass* supersuperklass = instanceKlass::cast(superk->super()); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
202 klassVtable* ssVtable = supersuperklass->vtable(); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
203 if (vtable_index < ssVtable->length()) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
204 methodOop super_method = ssVtable->method_at(vtable_index); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
205 #ifndef PRODUCT |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
206 symbolHandle name(THREAD,target_method()->name()); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
207 symbolHandle signature(THREAD,target_method()->signature()); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
208 assert(super_method->name() == name() && super_method->signature() == signature(), "vtable entry name/sig mismatch"); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
209 #endif |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
210 if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
211 #ifndef PRODUCT |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
212 if (PrintVtables && Verbose) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
213 ResourceMark rm(THREAD); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
214 tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
215 supersuperklass->internal_name(), |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
216 _klass->internal_name(), (target_method() != NULL) ? |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
217 target_method()->name()->as_C_string() : "<NULL>", vtable_index); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
218 super_method->access_flags().print_on(tty); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
219 tty->print("overriders flags: "); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
220 target_method->access_flags().print_on(tty); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
221 tty->cr(); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
222 } |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
223 #endif /*PRODUCT*/ |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
224 break; // return found superk |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
225 } |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
226 } else { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
227 // super class has no vtable entry here, stop transitive search |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
228 superk = (instanceKlass*)NULL; |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
229 break; |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
230 } |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
231 // if no override found yet, continue to search up |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
232 superk = instanceKlass::cast(superk->super()); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
233 } |
0 | 234 |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
235 return superk; |
0 | 236 } |
237 | |
238 | |
239 // Update child's copy of super vtable for overrides | |
240 // OR return true if a new vtable entry is required | |
241 // Only called for instanceKlass's, i.e. not for arrays | |
242 // If that changed, could not use _klass as handle for klass | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
243 bool klassVtable::update_inherited_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
244 bool checkconstraints, TRAPS) { |
0 | 245 ResourceMark rm; |
246 bool allocate_new = true; | |
247 assert(klass->oop_is_instance(), "must be instanceKlass"); | |
248 | |
249 // Initialize the method's vtable index to "nonvirtual". | |
250 // If we allocate a vtable entry, we will update it to a non-negative number. | |
251 target_method()->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); | |
252 | |
253 // Static and <init> methods are never in | |
254 if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { | |
255 return false; | |
256 } | |
257 | |
258 if (klass->is_final() || target_method()->is_final()) { | |
259 // a final method never needs a new entry; final methods can be statically | |
260 // resolved and they have to be present in the vtable only if they override | |
261 // a super's method, in which case they re-use its entry | |
262 allocate_new = false; | |
263 } | |
264 | |
265 // we need a new entry if there is no superclass | |
266 if (klass->super() == NULL) { | |
267 return allocate_new; | |
268 } | |
269 | |
270 // private methods always have a new entry in the vtable | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
271 // specification interpretation since classic has |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
272 // private methods not overriding |
0 | 273 if (target_method()->is_private()) { |
274 return allocate_new; | |
275 } | |
276 | |
277 // search through the vtable and update overridden entries | |
278 // Since check_signature_loaders acquires SystemDictionary_lock | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
279 // which can block for gc, once we are in this loop, use handles |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
280 // For classfiles built with >= jdk7, we now look for transitive overrides |
0 | 281 |
282 symbolHandle name(THREAD,target_method()->name()); | |
283 symbolHandle signature(THREAD,target_method()->signature()); | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
284 Handle target_loader(THREAD, _klass->class_loader()); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
285 symbolHandle target_classname(THREAD, _klass->name()); |
0 | 286 for(int i = 0; i < super_vtable_len; i++) { |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
287 methodOop super_method = method_at(i); |
0 | 288 // Check if method name matches |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
289 if (super_method->name() == name() && super_method->signature() == signature()) { |
0 | 290 |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
291 // get super_klass for method_holder for the found method |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
292 instanceKlass* super_klass = instanceKlass::cast(super_method->method_holder()); |
0 | 293 |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
294 if ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) || |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
295 ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
296 && ((super_klass = find_transitive_override(super_klass, target_method, i, target_loader, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
297 target_classname, THREAD)) != (instanceKlass*)NULL))) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
298 // overriding, so no new entry |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
299 allocate_new = false; |
0 | 300 |
301 if (checkconstraints) { | |
302 // Override vtable entry if passes loader constraint check | |
303 // if loader constraint checking requested | |
304 // No need to visit his super, since he and his super | |
305 // have already made any needed loader constraints. | |
306 // Since loader constraints are transitive, it is enough | |
307 // to link to the first super, and we get all the others. | |
308 Handle super_loader(THREAD, super_klass->class_loader()); | |
309 | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
310 if (target_loader() != super_loader()) { |
0 | 311 ResourceMark rm(THREAD); |
312 char* failed_type_name = | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
313 SystemDictionary::check_signature_loaders(signature, target_loader, |
0 | 314 super_loader, true, |
315 CHECK_(false)); | |
316 if (failed_type_name != NULL) { | |
317 const char* msg = "loader constraint violation: when resolving " | |
318 "overridden method \"%s\" the class loader (instance" | |
319 " of %s) of the current class, %s, and its superclass loader " | |
320 "(instance of %s), have different Class objects for the type " | |
321 "%s used in the signature"; | |
322 char* sig = target_method()->name_and_sig_as_C_string(); | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
323 const char* loader1 = SystemDictionary::loader_name(target_loader()); |
0 | 324 char* current = _klass->name()->as_C_string(); |
325 const char* loader2 = SystemDictionary::loader_name(super_loader()); | |
326 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
327 strlen(current) + strlen(loader2) + strlen(failed_type_name); | |
328 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
329 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
330 failed_type_name); | |
331 THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); | |
332 } | |
333 } | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
334 } |
0 | 335 |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
336 put_method_at(target_method(), i); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
337 target_method()->set_vtable_index(i); |
0 | 338 #ifndef PRODUCT |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
339 if (PrintVtables && Verbose) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
340 tty->print("overriding with %s::%s index %d, original flags: ", |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
341 _klass->internal_name(), (target_method() != NULL) ? |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
342 target_method()->name()->as_C_string() : "<NULL>", i); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
343 super_method->access_flags().print_on(tty); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
344 tty->print("overriders flags: "); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
345 target_method->access_flags().print_on(tty); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
346 tty->cr(); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
347 } |
0 | 348 #endif /*PRODUCT*/ |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
349 } else { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
350 // allocate_new = true; default. We might override one entry, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
351 // but not override another. Once we override one, not need new |
0 | 352 #ifndef PRODUCT |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
353 if (PrintVtables && Verbose) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
354 tty->print("NOT overriding with %s::%s index %d, original flags: ", |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
355 _klass->internal_name(), (target_method() != NULL) ? |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
356 target_method()->name()->as_C_string() : "<NULL>", i); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
357 super_method->access_flags().print_on(tty); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
358 tty->print("overriders flags: "); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
359 target_method->access_flags().print_on(tty); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
360 tty->cr(); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
361 } |
0 | 362 #endif /*PRODUCT*/ |
363 } | |
364 } | |
365 } | |
366 return allocate_new; | |
367 } | |
368 | |
369 void klassVtable::put_method_at(methodOop m, int index) { | |
370 assert(m->is_oop_or_null(), "Not an oop or null"); | |
371 #ifndef PRODUCT | |
372 if (PrintVtables && Verbose) { | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
373 ResourceMark rm; |
0 | 374 tty->print_cr("adding %s::%s at index %d", _klass->internal_name(), |
375 (m != NULL) ? m->name()->as_C_string() : "<NULL>", index); | |
376 } | |
377 assert(unchecked_method_at(index)->is_oop_or_null(), "Not an oop or null"); | |
378 #endif | |
379 table()[index].set(m); | |
380 } | |
381 | |
382 // Find out if a method "m" with superclass "super", loader "classloader" and | |
383 // name "classname" needs a new vtable entry. Let P be a class package defined | |
384 // by "classloader" and "classname". | |
385 // NOTE: The logic used here is very similar to the one used for computing | |
386 // the vtables indices for a method. We cannot directly use that function because, | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
387 // we allocate the instanceKlass at load time, and that requires that the |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
388 // superclass has been loaded. |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
389 // However, the vtable entries are filled in at link time, and therefore |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
390 // the superclass' vtable may not yet have been filled in. |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
391 bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
0 | 392 klassOop super, |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
393 Handle classloader, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
394 symbolHandle classname, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
395 AccessFlags class_flags, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
396 TRAPS) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
397 if ((class_flags.is_final() || target_method()->is_final()) || |
0 | 398 // a final method never needs a new entry; final methods can be statically |
399 // resolved and they have to be present in the vtable only if they override | |
400 // a super's method, in which case they re-use its entry | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
401 (target_method()->is_static()) || |
0 | 402 // static methods don't need to be in vtable |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
403 (target_method()->name() == vmSymbols::object_initializer_name()) |
0 | 404 // <init> is never called dynamically-bound |
405 ) { | |
406 return false; | |
407 } | |
408 | |
409 // we need a new entry if there is no superclass | |
410 if (super == NULL) { | |
411 return true; | |
412 } | |
413 | |
414 // private methods always have a new entry in the vtable | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
415 // specification interpretation since classic has |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
416 // private methods not overriding |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
417 if (target_method()->is_private()) { |
0 | 418 return true; |
419 } | |
420 | |
421 // search through the super class hierarchy to see if we need | |
422 // a new entry | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
423 ResourceMark rm; |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
424 symbolOop name = target_method()->name(); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
425 symbolOop signature = target_method()->signature(); |
0 | 426 klassOop k = super; |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
427 methodOop super_method = NULL; |
0 | 428 instanceKlass *holder = NULL; |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
429 methodOop recheck_method = NULL; |
0 | 430 while (k != NULL) { |
431 // lookup through the hierarchy for a method with matching name and sign. | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
432 super_method = instanceKlass::cast(k)->lookup_method(name, signature); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
433 if (super_method == NULL) { |
0 | 434 break; // we still have to search for a matching miranda method |
435 } | |
436 // get the class holding the matching method | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
437 // make sure you use that class for is_override |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
438 instanceKlass* superk = instanceKlass::cast(super_method->method_holder()); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
439 // we want only instance method matches |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
440 // pretend private methods are not in the super vtable |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
441 // since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
442 // ignore private, c.m pub does override a.m pub |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
443 // For classes that were not javac'd together, we also do transitive overriding around |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
444 // methods that have less accessibility |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
445 if ((!super_method->is_static()) && |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
446 (!super_method->is_private())) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
447 if (superk->is_override(super_method, classloader, classname, THREAD)) { |
0 | 448 return false; |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
449 // else keep looking for transitive overrides |
0 | 450 } |
451 } | |
452 | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
453 // Start with lookup result and continue to search up |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
454 k = superk->super(); // haven't found an override match yet; continue to look |
0 | 455 } |
456 | |
457 // if the target method is public or protected it may have a matching | |
458 // miranda method in the super, whose entry it should re-use. | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
459 // Actually, to handle cases that javac would not generate, we need |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
460 // this check for all access permissions. |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
461 instanceKlass *sk = instanceKlass::cast(super); |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
462 if (sk->has_miranda_methods()) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
463 if (sk->lookup_method_in_all_interfaces(name, signature) != NULL) { |
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
464 return false; // found a matching miranda; we do not need a new entry |
0 | 465 } |
466 } | |
467 return true; // found no match; we need a new entry | |
468 } | |
469 | |
470 // Support for miranda methods | |
471 | |
472 // get the vtable index of a miranda method with matching "name" and "signature" | |
473 int klassVtable::index_of_miranda(symbolOop name, symbolOop signature) { | |
474 // search from the bottom, might be faster | |
475 for (int i = (length() - 1); i >= 0; i--) { | |
476 methodOop m = table()[i].method(); | |
477 if (is_miranda_entry_at(i) && | |
478 m->name() == name && m->signature() == signature) { | |
479 return i; | |
480 } | |
481 } | |
482 return methodOopDesc::invalid_vtable_index; | |
483 } | |
484 | |
485 // check if an entry is miranda | |
486 bool klassVtable::is_miranda_entry_at(int i) { | |
487 methodOop m = method_at(i); | |
488 klassOop method_holder = m->method_holder(); | |
489 instanceKlass *mhk = instanceKlass::cast(method_holder); | |
490 | |
491 // miranda methods are interface methods in a class's vtable | |
492 if (mhk->is_interface()) { | |
493 assert(m->is_public() && m->is_abstract(), "should be public and abstract"); | |
494 assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); | |
495 assert(is_miranda(m, ik()->methods(), ik()->super()), "should be a miranda_method"); | |
496 return true; | |
497 } | |
498 return false; | |
499 } | |
500 | |
501 // check if a method is a miranda method, given a class's methods table and it's super | |
502 // the caller must make sure that the method belongs to an interface implemented by the class | |
503 bool klassVtable::is_miranda(methodOop m, objArrayOop class_methods, klassOop super) { | |
504 symbolOop name = m->name(); | |
505 symbolOop signature = m->signature(); | |
506 if (instanceKlass::find_method(class_methods, name, signature) == NULL) { | |
507 // did not find it in the method table of the current class | |
508 if (super == NULL) { | |
509 // super doesn't exist | |
510 return true; | |
511 } else { | |
512 if (instanceKlass::cast(super)->lookup_method(name, signature) == NULL) { | |
513 // super class hierarchy does not implement it | |
514 return true; | |
515 } | |
516 } | |
517 } | |
518 return false; | |
519 } | |
520 | |
521 void klassVtable::add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, | |
522 objArrayOop current_interface_methods, | |
523 objArrayOop class_methods, | |
524 klassOop super) { | |
525 // iterate thru the current interface's method to see if it a miranda | |
526 int num_methods = current_interface_methods->length(); | |
527 for (int i = 0; i < num_methods; i++) { | |
528 methodOop im = methodOop(current_interface_methods->obj_at(i)); | |
529 bool is_duplicate = false; | |
530 int num_of_current_mirandas = list_of_current_mirandas->length(); | |
531 // check for duplicate mirandas in different interfaces we implement | |
532 for (int j = 0; j < num_of_current_mirandas; j++) { | |
533 methodOop miranda = list_of_current_mirandas->at(j); | |
534 if ((im->name() == miranda->name()) && | |
535 (im->signature() == miranda->signature())) { | |
536 is_duplicate = true; | |
537 break; | |
538 } | |
539 } | |
540 | |
541 if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable | |
542 if (is_miranda(im, class_methods, super)) { // is it a miranda at all? | |
543 instanceKlass *sk = instanceKlass::cast(super); | |
544 // check if it is a duplicate of a super's miranda | |
545 if (sk->lookup_method_in_all_interfaces(im->name(), im->signature()) == NULL) { | |
546 list_of_current_mirandas->append(im); | |
547 } | |
548 } | |
549 } | |
550 } | |
551 } | |
552 | |
553 void klassVtable::get_mirandas(GrowableArray<methodOop>* mirandas, | |
554 klassOop super, objArrayOop class_methods, | |
555 objArrayOop local_interfaces) { | |
556 assert((mirandas->length() == 0) , "current mirandas must be 0"); | |
557 | |
558 // iterate thru the local interfaces looking for a miranda | |
559 int num_local_ifs = local_interfaces->length(); | |
560 for (int i = 0; i < num_local_ifs; i++) { | |
561 instanceKlass *ik = instanceKlass::cast(klassOop(local_interfaces->obj_at(i))); | |
562 add_new_mirandas_to_list(mirandas, ik->methods(), class_methods, super); | |
563 // iterate thru each local's super interfaces | |
564 objArrayOop super_ifs = ik->transitive_interfaces(); | |
565 int num_super_ifs = super_ifs->length(); | |
566 for (int j = 0; j < num_super_ifs; j++) { | |
567 instanceKlass *sik = instanceKlass::cast(klassOop(super_ifs->obj_at(j))); | |
568 add_new_mirandas_to_list(mirandas, sik->methods(), class_methods, super); | |
569 } | |
570 } | |
571 } | |
572 | |
573 // get number of mirandas | |
574 int klassVtable::get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces) { | |
575 ResourceMark rm; | |
576 GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); | |
577 get_mirandas(mirandas, super, class_methods, local_interfaces); | |
578 return mirandas->length(); | |
579 } | |
580 | |
581 // fill in mirandas | |
582 void klassVtable::fill_in_mirandas(int& initialized) { | |
583 ResourceMark rm; | |
584 GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); | |
585 instanceKlass *this_ik = ik(); | |
586 get_mirandas(mirandas, this_ik->super(), this_ik->methods(), this_ik->local_interfaces()); | |
587 int num_mirandas = mirandas->length(); | |
588 for (int i = 0; i < num_mirandas; i++) { | |
589 put_method_at(mirandas->at(i), initialized); | |
590 initialized++; | |
591 } | |
592 } | |
593 | |
594 void klassVtable::copy_vtable_to(vtableEntry* start) { | |
595 Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); | |
596 } | |
597 | |
598 void klassVtable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
599 int methods_length, bool * trace_name_printed) { | |
600 // search the vtable for uses of either obsolete or EMCP methods | |
601 for (int j = 0; j < methods_length; j++) { | |
602 methodOop old_method = old_methods[j]; | |
603 methodOop new_method = new_methods[j]; | |
604 | |
605 // In the vast majority of cases we could get the vtable index | |
606 // by using: old_method->vtable_index() | |
607 // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() | |
608 // in sun.awt.X11.XFramePeer where methods occur more than once in the | |
609 // vtable, so, alas, we must do an exhaustive search. | |
610 for (int index = 0; index < length(); index++) { | |
611 if (unchecked_method_at(index) == old_method) { | |
612 put_method_at(new_method, index); | |
613 | |
614 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
615 if (!(*trace_name_printed)) { | |
616 // RC_TRACE_MESG macro has an embedded ResourceMark | |
617 RC_TRACE_MESG(("adjust: name=%s", | |
618 Klass::cast(old_method->method_holder())->external_name())); | |
619 *trace_name_printed = true; | |
620 } | |
621 // RC_TRACE macro has an embedded ResourceMark | |
622 RC_TRACE(0x00100000, ("vtable method update: %s(%s)", | |
623 new_method->name()->as_C_string(), | |
624 new_method->signature()->as_C_string())); | |
625 } | |
626 } | |
627 } | |
628 } | |
629 } | |
630 | |
631 | |
632 // Garbage collection | |
633 void klassVtable::oop_follow_contents() { | |
634 int len = length(); | |
635 for (int i = 0; i < len; i++) { | |
636 MarkSweep::mark_and_push(adr_method_at(i)); | |
637 } | |
638 } | |
639 | |
640 #ifndef SERIALGC | |
641 void klassVtable::oop_follow_contents(ParCompactionManager* cm) { | |
642 int len = length(); | |
643 for (int i = 0; i < len; i++) { | |
644 PSParallelCompact::mark_and_push(cm, adr_method_at(i)); | |
645 } | |
646 } | |
647 #endif // SERIALGC | |
648 | |
649 void klassVtable::oop_adjust_pointers() { | |
650 int len = length(); | |
651 for (int i = 0; i < len; i++) { | |
652 MarkSweep::adjust_pointer(adr_method_at(i)); | |
653 } | |
654 } | |
655 | |
656 #ifndef SERIALGC | |
657 void klassVtable::oop_update_pointers(ParCompactionManager* cm) { | |
658 const int n = length(); | |
659 for (int i = 0; i < n; i++) { | |
660 PSParallelCompact::adjust_pointer(adr_method_at(i)); | |
661 } | |
662 } | |
663 | |
664 void klassVtable::oop_update_pointers(ParCompactionManager* cm, | |
665 HeapWord* beg_addr, HeapWord* end_addr) { | |
666 const int n = length(); | |
667 const int entry_size = vtableEntry::size(); | |
668 | |
669 int beg_idx = 0; | |
670 HeapWord* const method_0 = (HeapWord*)adr_method_at(0); | |
671 if (beg_addr > method_0) { | |
672 // it's safe to use cast, as we have guarantees on vtable size to be sane | |
673 beg_idx = int((pointer_delta(beg_addr, method_0) + entry_size - 1) / entry_size); | |
674 } | |
675 | |
676 oop* const beg_oop = adr_method_at(beg_idx); | |
677 oop* const end_oop = MIN2((oop*)end_addr, adr_method_at(n)); | |
678 for (oop* cur_oop = beg_oop; cur_oop < end_oop; cur_oop += entry_size) { | |
679 PSParallelCompact::adjust_pointer(cur_oop); | |
680 } | |
681 } | |
682 #endif // SERIALGC | |
683 | |
684 // Iterators | |
685 void klassVtable::oop_oop_iterate(OopClosure* blk) { | |
686 int len = length(); | |
687 for (int i = 0; i < len; i++) { | |
688 blk->do_oop(adr_method_at(i)); | |
689 } | |
690 } | |
691 | |
692 void klassVtable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
693 int len = length(); | |
694 int i; | |
695 for (i = 0; i < len; i++) { | |
696 if ((HeapWord*)adr_method_at(i) >= mr.start()) break; | |
697 } | |
698 for (; i < len; i++) { | |
699 oop* adr = adr_method_at(i); | |
700 if ((HeapWord*)adr < mr.end()) blk->do_oop(adr); | |
701 } | |
702 } | |
703 | |
704 //----------------------------------------------------------------------------------------- | |
705 // Itable code | |
706 | |
707 // Initialize a itableMethodEntry | |
708 void itableMethodEntry::initialize(methodOop m) { | |
709 if (m == NULL) return; | |
710 | |
711 _method = m; | |
712 } | |
713 | |
714 klassItable::klassItable(instanceKlassHandle klass) { | |
715 _klass = klass; | |
716 | |
717 if (klass->itable_length() > 0) { | |
718 itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); | |
719 if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized | |
720 // First offset entry points to the first method_entry | |
721 intptr_t* method_entry = (intptr_t *)(((address)klass->as_klassOop()) + offset_entry->offset()); | |
722 intptr_t* end = klass->end_of_itable(); | |
723 | |
724 _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass->as_klassOop(); | |
725 _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); | |
726 _size_method_table = (end - method_entry) / itableMethodEntry::size(); | |
727 assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); | |
728 return; | |
729 } | |
730 } | |
731 | |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
732 // The length of the itable was either zero, or it has not yet been initialized. |
0 | 733 _table_offset = 0; |
734 _size_offset_table = 0; | |
735 _size_method_table = 0; | |
736 } | |
737 | |
738 // Garbage Collection | |
739 | |
740 void klassItable::oop_follow_contents() { | |
741 // offset table | |
742 itableOffsetEntry* ioe = offset_entry(0); | |
743 for(int i = 0; i < _size_offset_table; i++) { | |
744 MarkSweep::mark_and_push((oop*)&ioe->_interface); | |
745 ioe++; | |
746 } | |
747 | |
748 // method table | |
749 itableMethodEntry* ime = method_entry(0); | |
750 for(int j = 0; j < _size_method_table; j++) { | |
751 MarkSweep::mark_and_push((oop*)&ime->_method); | |
752 ime++; | |
753 } | |
754 } | |
755 | |
756 #ifndef SERIALGC | |
757 void klassItable::oop_follow_contents(ParCompactionManager* cm) { | |
758 // offset table | |
759 itableOffsetEntry* ioe = offset_entry(0); | |
760 for(int i = 0; i < _size_offset_table; i++) { | |
761 PSParallelCompact::mark_and_push(cm, (oop*)&ioe->_interface); | |
762 ioe++; | |
763 } | |
764 | |
765 // method table | |
766 itableMethodEntry* ime = method_entry(0); | |
767 for(int j = 0; j < _size_method_table; j++) { | |
768 PSParallelCompact::mark_and_push(cm, (oop*)&ime->_method); | |
769 ime++; | |
770 } | |
771 } | |
772 #endif // SERIALGC | |
773 | |
774 void klassItable::oop_adjust_pointers() { | |
775 // offset table | |
776 itableOffsetEntry* ioe = offset_entry(0); | |
777 for(int i = 0; i < _size_offset_table; i++) { | |
778 MarkSweep::adjust_pointer((oop*)&ioe->_interface); | |
779 ioe++; | |
780 } | |
781 | |
782 // method table | |
783 itableMethodEntry* ime = method_entry(0); | |
784 for(int j = 0; j < _size_method_table; j++) { | |
785 MarkSweep::adjust_pointer((oop*)&ime->_method); | |
786 ime++; | |
787 } | |
788 } | |
789 | |
790 #ifndef SERIALGC | |
791 void klassItable::oop_update_pointers(ParCompactionManager* cm) { | |
792 // offset table | |
793 itableOffsetEntry* ioe = offset_entry(0); | |
794 for(int i = 0; i < _size_offset_table; i++) { | |
795 PSParallelCompact::adjust_pointer((oop*)&ioe->_interface); | |
796 ioe++; | |
797 } | |
798 | |
799 // method table | |
800 itableMethodEntry* ime = method_entry(0); | |
801 for(int j = 0; j < _size_method_table; j++) { | |
802 PSParallelCompact::adjust_pointer((oop*)&ime->_method); | |
803 ime++; | |
804 } | |
805 } | |
806 | |
807 void klassItable::oop_update_pointers(ParCompactionManager* cm, | |
808 HeapWord* beg_addr, HeapWord* end_addr) { | |
809 // offset table | |
810 itableOffsetEntry* ioe = offset_entry(0); | |
811 for(int i = 0; i < _size_offset_table; i++) { | |
812 oop* p = (oop*)&ioe->_interface; | |
813 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); | |
814 ioe++; | |
815 } | |
816 | |
817 // method table | |
818 itableMethodEntry* ime = method_entry(0); | |
819 for(int j = 0; j < _size_method_table; j++) { | |
820 oop* p = (oop*)&ime->_method; | |
821 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); | |
822 ime++; | |
823 } | |
824 } | |
825 #endif // SERIALGC | |
826 | |
827 // Iterators | |
828 void klassItable::oop_oop_iterate(OopClosure* blk) { | |
829 // offset table | |
830 itableOffsetEntry* ioe = offset_entry(0); | |
831 for(int i = 0; i < _size_offset_table; i++) { | |
832 blk->do_oop((oop*)&ioe->_interface); | |
833 ioe++; | |
834 } | |
835 | |
836 // method table | |
837 itableMethodEntry* ime = method_entry(0); | |
838 for(int j = 0; j < _size_method_table; j++) { | |
839 blk->do_oop((oop*)&ime->_method); | |
840 ime++; | |
841 } | |
842 } | |
843 | |
844 void klassItable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
845 // offset table | |
846 itableOffsetEntry* ioe = offset_entry(0); | |
847 for(int i = 0; i < _size_offset_table; i++) { | |
848 oop* adr = (oop*)&ioe->_interface; | |
849 if (mr.contains(adr)) blk->do_oop(adr); | |
850 ioe++; | |
851 } | |
852 | |
853 // method table | |
854 itableMethodEntry* ime = method_entry(0); | |
855 for(int j = 0; j < _size_method_table; j++) { | |
856 oop* adr = (oop*)&ime->_method; | |
857 if (mr.contains(adr)) blk->do_oop(adr); | |
858 ime++; | |
859 } | |
860 } | |
861 | |
862 | |
863 static int initialize_count = 0; | |
864 | |
865 // Initialization | |
866 void klassItable::initialize_itable(bool checkconstraints, TRAPS) { | |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
867 // Cannot be setup doing bootstrapping, interfaces don't have |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
868 // itables, and klass with only ones entry have empty itables |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
869 if (Universe::is_bootstrapping() || |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
870 _klass->is_interface() || |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
871 _klass->itable_length() == itableOffsetEntry::size()) return; |
0 | 872 |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
873 // There's alway an extra itable entry so we can null-terminate it. |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
874 guarantee(size_offset_table() >= 1, "too small"); |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
875 int num_interfaces = size_offset_table() - 1; |
0 | 876 if (num_interfaces > 0) { |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
877 if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
878 _klass->name()->as_C_string()); |
0 | 879 |
880 | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
881 // Iterate through all interfaces |
0 | 882 int i; |
883 for(i = 0; i < num_interfaces; i++) { | |
884 itableOffsetEntry* ioe = offset_entry(i); | |
885 KlassHandle interf_h (THREAD, ioe->interface_klass()); | |
886 assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); | |
887 initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); | |
888 } | |
889 | |
890 } | |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
891 // Check that the last entry is empty |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
892 itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
893 guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
0 | 894 } |
895 | |
896 | |
897 void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { | |
898 objArrayHandle methods(THREAD, instanceKlass::cast(interf_h())->methods()); | |
899 int nof_methods = methods()->length(); | |
900 HandleMark hm; | |
901 KlassHandle klass = _klass; | |
1489
cff162798819
6888953: some calls to function-like macros are missing semicolons
jcoomes
parents:
676
diff
changeset
|
902 assert(nof_methods > 0, "at least one method must exist for interface to be in vtable"); |
0 | 903 Handle interface_loader (THREAD, instanceKlass::cast(interf_h())->class_loader()); |
904 int ime_num = 0; | |
905 | |
906 // Skip first methodOop if it is a class initializer | |
907 int i = ((methodOop)methods()->obj_at(0))->name() != vmSymbols::class_initializer_name() ? 0 : 1; | |
908 | |
909 // m, method_name, method_signature, klass reset each loop so they | |
910 // don't need preserving across check_signature_loaders call | |
911 // methods needs a handle in case of gc from check_signature_loaders | |
912 for(; i < nof_methods; i++) { | |
913 methodOop m = (methodOop)methods()->obj_at(i); | |
914 symbolOop method_name = m->name(); | |
915 symbolOop method_signature = m->signature(); | |
916 | |
917 // This is same code as in Linkresolver::lookup_instance_method_in_klasses | |
918 methodOop target = klass->uncached_lookup_method(method_name, method_signature); | |
919 while (target != NULL && target->is_static()) { | |
920 // continue with recursive lookup through the superclass | |
921 klassOop super = Klass::cast(target->method_holder())->super(); | |
922 target = (super == NULL) ? methodOop(NULL) : Klass::cast(super)->uncached_lookup_method(method_name, method_signature); | |
923 } | |
924 if (target == NULL || !target->is_public() || target->is_abstract()) { | |
925 // Entry do not resolve. Leave it empty | |
926 } else { | |
927 // Entry did resolve, check loader constraints before initializing | |
928 // if checkconstraints requested | |
929 methodHandle target_h (THREAD, target); // preserve across gc | |
930 if (checkconstraints) { | |
931 Handle method_holder_loader (THREAD, instanceKlass::cast(target->method_holder())->class_loader()); | |
932 if (method_holder_loader() != interface_loader()) { | |
933 ResourceMark rm(THREAD); | |
934 char* failed_type_name = | |
935 SystemDictionary::check_signature_loaders(method_signature, | |
936 method_holder_loader, | |
937 interface_loader, | |
938 true, CHECK); | |
939 if (failed_type_name != NULL) { | |
940 const char* msg = "loader constraint violation in interface " | |
941 "itable initialization: when resolving method \"%s\" the class" | |
942 " loader (instance of %s) of the current class, %s, " | |
943 "and the class loader (instance of %s) for interface " | |
944 "%s have different Class objects for the type %s " | |
945 "used in the signature"; | |
946 char* sig = target_h()->name_and_sig_as_C_string(); | |
947 const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); | |
948 char* current = klass->name()->as_C_string(); | |
949 const char* loader2 = SystemDictionary::loader_name(interface_loader()); | |
950 char* iface = instanceKlass::cast(interf_h())->name()->as_C_string(); | |
951 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
952 strlen(current) + strlen(loader2) + strlen(iface) + | |
953 strlen(failed_type_name); | |
954 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
955 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
956 iface, failed_type_name); | |
957 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
958 } | |
959 } | |
960 } | |
961 | |
962 // ime may have moved during GC so recalculate address | |
963 itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target_h()); | |
964 } | |
965 // Progress to next entry | |
966 ime_num++; | |
967 } | |
968 } | |
969 | |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
970 // Update entry for specific methodOop |
0 | 971 void klassItable::initialize_with_method(methodOop m) { |
972 itableMethodEntry* ime = method_entry(0); | |
973 for(int i = 0; i < _size_method_table; i++) { | |
974 if (ime->method() == m) { | |
975 ime->initialize(m); | |
976 } | |
977 ime++; | |
978 } | |
979 } | |
980 | |
981 void klassItable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
982 int methods_length, bool * trace_name_printed) { | |
983 // search the itable for uses of either obsolete or EMCP methods | |
984 for (int j = 0; j < methods_length; j++) { | |
985 methodOop old_method = old_methods[j]; | |
986 methodOop new_method = new_methods[j]; | |
987 itableMethodEntry* ime = method_entry(0); | |
988 | |
610
70998f2e05ef
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
196
diff
changeset
|
989 // The itable can describe more than one interface and the same |
70998f2e05ef
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
196
diff
changeset
|
990 // method signature can be specified by more than one interface. |
70998f2e05ef
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
196
diff
changeset
|
991 // This means we have to do an exhaustive search to find all the |
70998f2e05ef
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
196
diff
changeset
|
992 // old_method references. |
0 | 993 for (int i = 0; i < _size_method_table; i++) { |
994 if (ime->method() == old_method) { | |
995 ime->initialize(new_method); | |
996 | |
997 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
998 if (!(*trace_name_printed)) { | |
999 // RC_TRACE_MESG macro has an embedded ResourceMark | |
1000 RC_TRACE_MESG(("adjust: name=%s", | |
1001 Klass::cast(old_method->method_holder())->external_name())); | |
1002 *trace_name_printed = true; | |
1003 } | |
1004 // RC_TRACE macro has an embedded ResourceMark | |
1005 RC_TRACE(0x00200000, ("itable method update: %s(%s)", | |
1006 new_method->name()->as_C_string(), | |
1007 new_method->signature()->as_C_string())); | |
1008 } | |
652
4aaa9f5e02a8
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
610
diff
changeset
|
1009 break; |
0 | 1010 } |
1011 ime++; | |
1012 } | |
1013 } | |
1014 } | |
1015 | |
1016 | |
1017 // Setup | |
1018 class InterfaceVisiterClosure : public StackObj { | |
1019 public: | |
1020 virtual void doit(klassOop intf, int method_count) = 0; | |
1021 }; | |
1022 | |
1023 // Visit all interfaces with at-least one method (excluding <clinit>) | |
1024 void visit_all_interfaces(objArrayOop transitive_intf, InterfaceVisiterClosure *blk) { | |
1025 // Handle array argument | |
1026 for(int i = 0; i < transitive_intf->length(); i++) { | |
1027 klassOop intf = (klassOop)transitive_intf->obj_at(i); | |
1028 assert(Klass::cast(intf)->is_interface(), "sanity check"); | |
1029 | |
1030 // Find no. of methods excluding a <clinit> | |
1031 int method_count = instanceKlass::cast(intf)->methods()->length(); | |
1032 if (method_count > 0) { | |
1033 methodOop m = (methodOop)instanceKlass::cast(intf)->methods()->obj_at(0); | |
1034 assert(m != NULL && m->is_method(), "sanity check"); | |
1035 if (m->name() == vmSymbols::object_initializer_name()) { | |
1036 method_count--; | |
1037 } | |
1038 } | |
1039 | |
1040 // Only count interfaces with at least one method | |
1041 if (method_count > 0) { | |
1042 blk->doit(intf, method_count); | |
1043 } | |
1044 } | |
1045 } | |
1046 | |
1047 class CountInterfacesClosure : public InterfaceVisiterClosure { | |
1048 private: | |
1049 int _nof_methods; | |
1050 int _nof_interfaces; | |
1051 public: | |
1052 CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } | |
1053 | |
1054 int nof_methods() const { return _nof_methods; } | |
1055 int nof_interfaces() const { return _nof_interfaces; } | |
1056 | |
1057 void doit(klassOop intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } | |
1058 }; | |
1059 | |
1060 class SetupItableClosure : public InterfaceVisiterClosure { | |
1061 private: | |
1062 itableOffsetEntry* _offset_entry; | |
1063 itableMethodEntry* _method_entry; | |
1064 address _klass_begin; | |
1065 public: | |
1066 SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { | |
1067 _klass_begin = klass_begin; | |
1068 _offset_entry = offset_entry; | |
1069 _method_entry = method_entry; | |
1070 } | |
1071 | |
1072 itableMethodEntry* method_entry() const { return _method_entry; } | |
1073 | |
1074 void doit(klassOop intf, int method_count) { | |
1075 int offset = ((address)_method_entry) - _klass_begin; | |
1076 _offset_entry->initialize(intf, offset); | |
1077 _offset_entry++; | |
1078 _method_entry += method_count; | |
1079 } | |
1080 }; | |
1081 | |
1082 int klassItable::compute_itable_size(objArrayHandle transitive_interfaces) { | |
1083 // Count no of interfaces and total number of interface methods | |
1084 CountInterfacesClosure cic; | |
1085 visit_all_interfaces(transitive_interfaces(), &cic); | |
1086 | |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
1087 // There's alway an extra itable entry so we can null-terminate it. |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
1088 int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
0 | 1089 |
1090 // Statistics | |
1091 update_stats(itable_size * HeapWordSize); | |
1092 | |
1093 return itable_size; | |
1094 } | |
1095 | |
1096 | |
1097 // Fill out offset table and interface klasses into the itable space | |
1098 void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { | |
1099 if (klass->itable_length() == 0) return; | |
1100 assert(!klass->is_interface(), "Should have zero length itable"); | |
1101 | |
1102 // Count no of interfaces and total number of interface methods | |
1103 CountInterfacesClosure cic; | |
1104 visit_all_interfaces(klass->transitive_interfaces(), &cic); | |
1105 int nof_methods = cic.nof_methods(); | |
1106 int nof_interfaces = cic.nof_interfaces(); | |
1107 | |
16
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
1108 // Add one extra entry so we can null-terminate the table |
f8236e79048a
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
0
diff
changeset
|
1109 nof_interfaces++; |
0 | 1110 |
1111 assert(compute_itable_size(objArrayHandle(klass->transitive_interfaces())) == | |
1112 calc_itable_size(nof_interfaces, nof_methods), | |
1113 "mismatch calculation of itable size"); | |
1114 | |
1115 // Fill-out offset table | |
1116 itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); | |
1117 itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); | |
1118 intptr_t* end = klass->end_of_itable(); | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
16
diff
changeset
|
1119 assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_static_fields(), "wrong offset calculation (1)"); |
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
16
diff
changeset
|
1120 assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
0 | 1121 |
1122 // Visit all interfaces and initialize itable offset table | |
1123 SetupItableClosure sic((address)klass->as_klassOop(), ioe, ime); | |
1124 visit_all_interfaces(klass->transitive_interfaces(), &sic); | |
1125 | |
1126 #ifdef ASSERT | |
1127 ime = sic.method_entry(); | |
1128 oop* v = (oop*) klass->end_of_itable(); | |
1129 assert( (oop*)(ime) == v, "wrong offset calculation (2)"); | |
1130 #endif | |
1131 } | |
1132 | |
1133 | |
1134 // m must be a method in an interface | |
1135 int klassItable::compute_itable_index(methodOop m) { | |
1136 klassOop intf = m->method_holder(); | |
1137 assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); | |
1138 objArrayOop methods = instanceKlass::cast(intf)->methods(); | |
1139 int index = 0; | |
1140 while(methods->obj_at(index) != m) { | |
1141 index++; | |
1142 assert(index < methods->length(), "should find index for resolve_invoke"); | |
1143 } | |
1144 // Adjust for <clinit>, which is left out of table if first method | |
1145 if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->name() == vmSymbols::class_initializer_name()) { | |
1146 index--; | |
1147 } | |
1148 return index; | |
1149 } | |
1150 | |
665
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1151 |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1152 // inverse to compute_itable_index |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1153 methodOop klassItable::method_for_itable_index(klassOop intf, int itable_index) { |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1154 assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1155 objArrayOop methods = instanceKlass::cast(intf)->methods(); |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1156 |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1157 int index = itable_index; |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1158 // Adjust for <clinit>, which is left out of table if first method |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1159 if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->name() == vmSymbols::class_initializer_name()) { |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1160 index++; |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1161 } |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1162 |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1163 if (itable_index < 0 || index >= methods->length()) |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1164 return NULL; // help caller defend against bad indexes |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1165 |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1166 methodOop m = (methodOop)methods->obj_at(index); |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1167 assert(compute_itable_index(m) == itable_index, "correct inverse"); |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1168 |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1169 return m; |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1170 } |
c89f86385056
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
610
diff
changeset
|
1171 |
0 | 1172 void klassVtable::verify(outputStream* st, bool forced) { |
1173 // make sure table is initialized | |
1174 if (!Universe::is_fully_initialized()) return; | |
1175 #ifndef PRODUCT | |
1176 // avoid redundant verifies | |
1177 if (!forced && _verify_count == Universe::verify_count()) return; | |
1178 _verify_count = Universe::verify_count(); | |
1179 #endif | |
1180 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
1181 oop* end_of_vtable = (oop *)&table()[_length]; | |
1182 if (end_of_vtable > end_of_obj) { | |
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1489
diff
changeset
|
1183 fatal(err_msg("klass %s: klass object too short (vtable extends beyond " |
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1489
diff
changeset
|
1184 "end)", _klass->internal_name())); |
0 | 1185 } |
1186 | |
1187 for (int i = 0; i < _length; i++) table()[i].verify(this, st); | |
1188 // verify consistency with superKlass vtable | |
1189 klassOop super = _klass->super(); | |
1190 if (super != NULL) { | |
1191 instanceKlass* sk = instanceKlass::cast(super); | |
1192 klassVtable* vt = sk->vtable(); | |
1193 for (int i = 0; i < vt->length(); i++) { | |
1194 verify_against(st, vt, i); | |
1195 } | |
1196 } | |
1197 } | |
1198 | |
1199 void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { | |
1200 vtableEntry* vte = &vt->table()[index]; | |
1201 if (vte->method()->name() != table()[index].method()->name() || | |
1202 vte->method()->signature() != table()[index].method()->signature()) { | |
1203 fatal("mismatched name/signature of vtable entries"); | |
1204 } | |
1205 } | |
1206 | |
1207 #ifndef PRODUCT | |
1208 void klassVtable::print() { | |
1209 ResourceMark rm; | |
1210 tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); | |
1211 for (int i = 0; i < length(); i++) { | |
1212 table()[i].print(); | |
1213 tty->cr(); | |
1214 } | |
1215 } | |
1216 #endif | |
1217 | |
1218 void vtableEntry::verify(klassVtable* vt, outputStream* st) { | |
1219 NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); | |
1220 assert(method() != NULL, "must have set method"); | |
1221 method()->verify(); | |
1222 // we sub_type, because it could be a miranda method | |
1223 if (!vt->klass()->is_subtype_of(method()->method_holder())) { | |
1224 #ifndef PRODUCT | |
1225 print(); | |
1226 #endif | |
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1489
diff
changeset
|
1227 fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this)); |
0 | 1228 } |
1229 } | |
1230 | |
1231 #ifndef PRODUCT | |
1232 | |
1233 void vtableEntry::print() { | |
1234 ResourceMark rm; | |
1235 tty->print("vtableEntry %s: ", method()->name()->as_C_string()); | |
1236 if (Verbose) { | |
1237 tty->print("m %#lx ", (address)method()); | |
1238 } | |
1239 } | |
1240 | |
1241 class VtableStats : AllStatic { | |
1242 public: | |
1243 static int no_klasses; // # classes with vtables | |
1244 static int no_array_klasses; // # array classes | |
1245 static int no_instance_klasses; // # instanceKlasses | |
1246 static int sum_of_vtable_len; // total # of vtable entries | |
1247 static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only | |
1248 static int fixed; // total fixed overhead in bytes | |
1249 static int filler; // overhead caused by filler bytes | |
1250 static int entries; // total bytes consumed by vtable entries | |
1251 static int array_entries; // total bytes consumed by array vtable entries | |
1252 | |
1253 static void do_class(klassOop k) { | |
1254 Klass* kl = k->klass_part(); | |
1255 klassVtable* vt = kl->vtable(); | |
1256 if (vt == NULL) return; | |
1257 no_klasses++; | |
1258 if (kl->oop_is_instance()) { | |
1259 no_instance_klasses++; | |
1260 kl->array_klasses_do(do_class); | |
1261 } | |
1262 if (kl->oop_is_array()) { | |
1263 no_array_klasses++; | |
1264 sum_of_array_vtable_len += vt->length(); | |
1265 } | |
1266 sum_of_vtable_len += vt->length(); | |
1267 } | |
1268 | |
1269 static void compute() { | |
1270 SystemDictionary::classes_do(do_class); | |
1271 fixed = no_klasses * oopSize; // vtable length | |
1272 // filler size is a conservative approximation | |
1273 filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(instanceKlass) - sizeof(arrayKlass) - 1); | |
1274 entries = sizeof(vtableEntry) * sum_of_vtable_len; | |
1275 array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; | |
1276 } | |
1277 }; | |
1278 | |
1279 int VtableStats::no_klasses = 0; | |
1280 int VtableStats::no_array_klasses = 0; | |
1281 int VtableStats::no_instance_klasses = 0; | |
1282 int VtableStats::sum_of_vtable_len = 0; | |
1283 int VtableStats::sum_of_array_vtable_len = 0; | |
1284 int VtableStats::fixed = 0; | |
1285 int VtableStats::filler = 0; | |
1286 int VtableStats::entries = 0; | |
1287 int VtableStats::array_entries = 0; | |
1288 | |
1289 void klassVtable::print_statistics() { | |
1290 ResourceMark rm; | |
1291 HandleMark hm; | |
1292 VtableStats::compute(); | |
1293 tty->print_cr("vtable statistics:"); | |
1294 tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); | |
1295 int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; | |
1296 tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); | |
1297 tty->print_cr("%6d bytes filler overhead", VtableStats::filler); | |
1298 tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); | |
1299 tty->print_cr("%6d bytes total", total); | |
1300 } | |
1301 | |
1302 bool klassVtable::check_no_old_entries() { | |
1303 // Check that there really is no entry | |
1304 for (int i = 0; i < length(); i++) { | |
1305 methodOop m = unchecked_method_at(i); | |
1306 if (m != NULL) { | |
1307 if (m->is_old()) { | |
1308 return false; | |
1309 } | |
1310 } | |
1311 } | |
1312 return true; | |
1313 } | |
1314 | |
1315 void klassVtable::dump_vtable() { | |
1316 tty->print_cr("vtable dump --"); | |
1317 for (int i = 0; i < length(); i++) { | |
1318 methodOop m = unchecked_method_at(i); | |
1319 if (m != NULL) { | |
1320 tty->print(" (%5d) ", i); | |
1321 m->access_flags().print_on(tty); | |
1322 tty->print(" -- "); | |
1323 m->print_name(tty); | |
1324 tty->cr(); | |
1325 } | |
1326 } | |
1327 } | |
1328 | |
1329 int klassItable::_total_classes; // Total no. of classes with itables | |
1330 long klassItable::_total_size; // Total no. of bytes used for itables | |
1331 | |
1332 void klassItable::print_statistics() { | |
1333 tty->print_cr("itable statistics:"); | |
1334 tty->print_cr("%6d classes with itables", _total_classes); | |
1335 tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); | |
1336 } | |
1337 | |
1338 #endif // PRODUCT |