Mercurial > hg > graal-compiler
annotate src/share/vm/oops/klassVtable.cpp @ 8827:42e370795a39
8010818: NPG: Remove metaspace memory pools
Reviewed-by: mgerdin, stefank
author | ehelin |
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date | Wed, 27 Mar 2013 10:55:37 +0100 |
parents | 8d9fc28831cc |
children | cd3089a56438 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 "classfile/systemDictionary.hpp" | |
27 #include "classfile/vmSymbols.hpp" | |
28 #include "gc_implementation/shared/markSweep.inline.hpp" | |
29 #include "memory/gcLocker.hpp" | |
30 #include "memory/resourceArea.hpp" | |
31 #include "memory/universe.inline.hpp" | |
32 #include "oops/instanceKlass.hpp" | |
33 #include "oops/klassVtable.hpp" | |
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34 #include "oops/method.hpp" |
1972 | 35 #include "oops/objArrayOop.hpp" |
36 #include "oops/oop.inline.hpp" | |
37 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
38 #include "runtime/arguments.hpp" | |
39 #include "runtime/handles.inline.hpp" | |
40 #include "utilities/copy.hpp" | |
0 | 41 |
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42 inline InstanceKlass* klassVtable::ik() const { |
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43 Klass* k = _klass(); |
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44 assert(k->oop_is_instance(), "not an InstanceKlass"); |
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45 return (InstanceKlass*)k; |
0 | 46 } |
47 | |
48 | |
49 // this function computes the vtable size (including the size needed for miranda | |
50 // methods) and the number of miranda methods in this class | |
51 // Note on Miranda methods: Let's say there is a class C that implements | |
52 // interface I. Let's say there is a method m in I that neither C nor any | |
53 // of its super classes implement (i.e there is no method of any access, with | |
54 // the same name and signature as m), then m is a Miranda method which is | |
55 // entered as a public abstract method in C's vtable. From then on it should | |
56 // treated as any other public method in C for method over-ride purposes. | |
6934 | 57 void klassVtable::compute_vtable_size_and_num_mirandas( |
58 int* vtable_length_ret, int* num_new_mirandas, | |
59 GrowableArray<Method*>* all_mirandas, Klass* super, | |
60 Array<Method*>* methods, AccessFlags class_flags, | |
61 Handle classloader, Symbol* classname, Array<Klass*>* local_interfaces, | |
62 TRAPS) { | |
0 | 63 No_Safepoint_Verifier nsv; |
64 | |
65 // set up default result values | |
6934 | 66 int vtable_length = 0; |
0 | 67 |
68 // start off with super's vtable length | |
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69 InstanceKlass* sk = (InstanceKlass*)super; |
0 | 70 vtable_length = super == NULL ? 0 : sk->vtable_length(); |
71 | |
72 // go thru each method in the methods table to see if it needs a new entry | |
73 int len = methods->length(); | |
74 for (int i = 0; i < len; i++) { | |
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75 assert(methods->at(i)->is_method(), "must be a Method*"); |
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76 methodHandle mh(THREAD, methods->at(i)); |
0 | 77 |
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78 if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
0 | 79 vtable_length += vtableEntry::size(); // we need a new entry |
80 } | |
81 } | |
82 | |
6934 | 83 GrowableArray<Method*> new_mirandas(20); |
0 | 84 // compute the number of mirandas methods that must be added to the end |
6934 | 85 get_mirandas(&new_mirandas, all_mirandas, super, methods, local_interfaces); |
86 *num_new_mirandas = new_mirandas.length(); | |
87 | |
88 vtable_length += *num_new_mirandas * vtableEntry::size(); | |
0 | 89 |
90 if (Universe::is_bootstrapping() && vtable_length == 0) { | |
91 // array classes don't have their superclass set correctly during | |
92 // bootstrapping | |
93 vtable_length = Universe::base_vtable_size(); | |
94 } | |
95 | |
96 if (super == NULL && !Universe::is_bootstrapping() && | |
97 vtable_length != Universe::base_vtable_size()) { | |
98 // Someone is attempting to redefine java.lang.Object incorrectly. The | |
99 // only way this should happen is from | |
100 // SystemDictionary::resolve_from_stream(), which will detect this later | |
101 // and throw a security exception. So don't assert here to let | |
102 // the exception occur. | |
103 vtable_length = Universe::base_vtable_size(); | |
104 } | |
105 assert(super != NULL || vtable_length == Universe::base_vtable_size(), | |
106 "bad vtable size for class Object"); | |
107 assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); | |
108 assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); | |
6934 | 109 |
110 *vtable_length_ret = vtable_length; | |
0 | 111 } |
112 | |
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113 int klassVtable::index_of(Method* m, int len) const { |
0 | 114 assert(m->vtable_index() >= 0, "do not ask this of non-vtable methods"); |
115 return m->vtable_index(); | |
116 } | |
117 | |
118 int klassVtable::initialize_from_super(KlassHandle super) { | |
119 if (super.is_null()) { | |
120 return 0; | |
121 } else { | |
122 // copy methods from superKlass | |
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123 // can't inherit from array class, so must be InstanceKlass |
0 | 124 assert(super->oop_is_instance(), "must be instance klass"); |
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125 InstanceKlass* sk = (InstanceKlass*)super(); |
0 | 126 klassVtable* superVtable = sk->vtable(); |
127 assert(superVtable->length() <= _length, "vtable too short"); | |
128 #ifdef ASSERT | |
129 superVtable->verify(tty, true); | |
130 #endif | |
131 superVtable->copy_vtable_to(table()); | |
132 #ifndef PRODUCT | |
133 if (PrintVtables && Verbose) { | |
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134 ResourceMark rm; |
0 | 135 tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
136 } | |
137 #endif | |
138 return superVtable->length(); | |
139 } | |
140 } | |
141 | |
142 // Revised lookup semantics introduced 1.3 (Kestral beta) | |
143 void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { | |
144 | |
145 // Note: Arrays can have intermediate array supers. Use java_super to skip them. | |
146 KlassHandle super (THREAD, klass()->java_super()); | |
147 int nofNewEntries = 0; | |
148 | |
149 | |
150 if (PrintVtables && !klass()->oop_is_array()) { | |
151 ResourceMark rm(THREAD); | |
152 tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); | |
153 } | |
154 | |
155 #ifdef ASSERT | |
156 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
157 oop* end_of_vtable = (oop*)&table()[_length]; | |
158 assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); | |
159 #endif | |
160 | |
161 if (Universe::is_bootstrapping()) { | |
162 // just clear everything | |
163 for (int i = 0; i < _length; i++) table()[i].clear(); | |
164 return; | |
165 } | |
166 | |
167 int super_vtable_len = initialize_from_super(super); | |
168 if (klass()->oop_is_array()) { | |
169 assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); | |
170 } else { | |
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171 assert(_klass->oop_is_instance(), "must be InstanceKlass"); |
0 | 172 |
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173 Array<Method*>* methods = ik()->methods(); |
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174 int len = methods->length(); |
0 | 175 int initialized = super_vtable_len; |
176 | |
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177 // update_inherited_vtable can stop for gc - ensure using handles |
0 | 178 for (int i = 0; i < len; i++) { |
179 HandleMark hm(THREAD); | |
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180 assert(methods->at(i)->is_method(), "must be a Method*"); |
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181 methodHandle mh(THREAD, methods->at(i)); |
0 | 182 |
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183 bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, checkconstraints, CHECK); |
0 | 184 |
185 if (needs_new_entry) { | |
186 put_method_at(mh(), initialized); | |
187 mh()->set_vtable_index(initialized); // set primary vtable index | |
188 initialized++; | |
189 } | |
190 } | |
191 | |
192 // add miranda methods; it will also update the value of initialized | |
6934 | 193 fill_in_mirandas(&initialized); |
0 | 194 |
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195 // In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
0 | 196 // package_private -> publicprotected), the vtable might actually be smaller than our initial |
197 // calculation. | |
198 assert(initialized <= _length, "vtable initialization failed"); | |
199 for(;initialized < _length; initialized++) { | |
200 put_method_at(NULL, initialized); | |
201 } | |
202 NOT_PRODUCT(verify(tty, true)); | |
203 } | |
204 } | |
205 | |
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206 // Called for cases where a method does not override its superclass' vtable entry |
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207 // For bytecodes not produced by javac together it is possible that a method does not override |
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208 // the superclass's method, but might indirectly override a super-super class's vtable entry |
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209 // If none found, return a null superk, else return the superk of the method this does override |
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210 InstanceKlass* klassVtable::find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, |
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211 int vtable_index, Handle target_loader, Symbol* target_classname, Thread * THREAD) { |
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212 InstanceKlass* superk = initialsuper; |
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213 while (superk != NULL && superk->super() != NULL) { |
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214 InstanceKlass* supersuperklass = InstanceKlass::cast(superk->super()); |
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215 klassVtable* ssVtable = supersuperklass->vtable(); |
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216 if (vtable_index < ssVtable->length()) { |
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217 Method* super_method = ssVtable->method_at(vtable_index); |
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218 #ifndef PRODUCT |
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219 Symbol* name= target_method()->name(); |
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220 Symbol* signature = target_method()->signature(); |
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221 assert(super_method->name() == name && super_method->signature() == signature, "vtable entry name/sig mismatch"); |
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222 #endif |
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223 if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
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224 #ifndef PRODUCT |
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225 if (PrintVtables && Verbose) { |
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226 ResourceMark rm(THREAD); |
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227 tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
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228 supersuperklass->internal_name(), |
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229 _klass->internal_name(), (target_method() != NULL) ? |
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230 target_method()->name()->as_C_string() : "<NULL>", vtable_index); |
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231 super_method->access_flags().print_on(tty); |
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232 tty->print("overriders flags: "); |
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233 target_method->access_flags().print_on(tty); |
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234 tty->cr(); |
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235 } |
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236 #endif /*PRODUCT*/ |
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237 break; // return found superk |
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238 } |
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239 } else { |
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240 // super class has no vtable entry here, stop transitive search |
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241 superk = (InstanceKlass*)NULL; |
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242 break; |
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243 } |
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244 // if no override found yet, continue to search up |
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245 superk = InstanceKlass::cast(superk->super()); |
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246 } |
0 | 247 |
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248 return superk; |
0 | 249 } |
250 | |
6934 | 251 // Methods that are "effectively" final don't need vtable entries. |
252 bool method_is_effectively_final( | |
253 AccessFlags klass_flags, methodHandle target) { | |
254 return target->is_final() || klass_flags.is_final() && !target->is_overpass(); | |
255 } | |
0 | 256 |
257 // Update child's copy of super vtable for overrides | |
258 // OR return true if a new vtable entry is required | |
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259 // Only called for InstanceKlass's, i.e. not for arrays |
0 | 260 // If that changed, could not use _klass as handle for klass |
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261 bool klassVtable::update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, |
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262 bool checkconstraints, TRAPS) { |
0 | 263 ResourceMark rm; |
264 bool allocate_new = true; | |
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265 assert(klass->oop_is_instance(), "must be InstanceKlass"); |
0 | 266 |
267 // Initialize the method's vtable index to "nonvirtual". | |
268 // If we allocate a vtable entry, we will update it to a non-negative number. | |
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269 target_method()->set_vtable_index(Method::nonvirtual_vtable_index); |
0 | 270 |
271 // Static and <init> methods are never in | |
272 if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { | |
273 return false; | |
274 } | |
275 | |
6934 | 276 if (method_is_effectively_final(klass->access_flags(), target_method)) { |
0 | 277 // a final method never needs a new entry; final methods can be statically |
278 // resolved and they have to be present in the vtable only if they override | |
279 // a super's method, in which case they re-use its entry | |
280 allocate_new = false; | |
281 } | |
282 | |
283 // we need a new entry if there is no superclass | |
284 if (klass->super() == NULL) { | |
285 return allocate_new; | |
286 } | |
287 | |
288 // private methods always have a new entry in the vtable | |
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289 // specification interpretation since classic has |
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290 // private methods not overriding |
0 | 291 if (target_method()->is_private()) { |
292 return allocate_new; | |
293 } | |
294 | |
295 // search through the vtable and update overridden entries | |
296 // Since check_signature_loaders acquires SystemDictionary_lock | |
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297 // which can block for gc, once we are in this loop, use handles |
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298 // For classfiles built with >= jdk7, we now look for transitive overrides |
0 | 299 |
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300 Symbol* name = target_method()->name(); |
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301 Symbol* signature = target_method()->signature(); |
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302 Handle target_loader(THREAD, _klass()->class_loader()); |
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303 Symbol* target_classname = _klass->name(); |
0 | 304 for(int i = 0; i < super_vtable_len; i++) { |
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305 Method* super_method = method_at(i); |
0 | 306 // Check if method name matches |
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307 if (super_method->name() == name && super_method->signature() == signature) { |
0 | 308 |
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309 // get super_klass for method_holder for the found method |
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310 InstanceKlass* super_klass = super_method->method_holder(); |
0 | 311 |
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312 if ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) || |
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313 ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
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314 && ((super_klass = find_transitive_override(super_klass, target_method, i, target_loader, |
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315 target_classname, THREAD)) != (InstanceKlass*)NULL))) { |
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316 // overriding, so no new entry |
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317 allocate_new = false; |
0 | 318 |
319 if (checkconstraints) { | |
320 // Override vtable entry if passes loader constraint check | |
321 // if loader constraint checking requested | |
322 // No need to visit his super, since he and his super | |
323 // have already made any needed loader constraints. | |
324 // Since loader constraints are transitive, it is enough | |
325 // to link to the first super, and we get all the others. | |
326 Handle super_loader(THREAD, super_klass->class_loader()); | |
327 | |
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328 if (target_loader() != super_loader()) { |
0 | 329 ResourceMark rm(THREAD); |
330 char* failed_type_name = | |
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331 SystemDictionary::check_signature_loaders(signature, target_loader, |
0 | 332 super_loader, true, |
333 CHECK_(false)); | |
334 if (failed_type_name != NULL) { | |
335 const char* msg = "loader constraint violation: when resolving " | |
336 "overridden method \"%s\" the class loader (instance" | |
337 " of %s) of the current class, %s, and its superclass loader " | |
338 "(instance of %s), have different Class objects for the type " | |
339 "%s used in the signature"; | |
340 char* sig = target_method()->name_and_sig_as_C_string(); | |
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341 const char* loader1 = SystemDictionary::loader_name(target_loader()); |
0 | 342 char* current = _klass->name()->as_C_string(); |
343 const char* loader2 = SystemDictionary::loader_name(super_loader()); | |
344 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
345 strlen(current) + strlen(loader2) + strlen(failed_type_name); | |
346 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
347 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
348 failed_type_name); | |
349 THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); | |
350 } | |
351 } | |
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352 } |
0 | 353 |
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354 put_method_at(target_method(), i); |
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355 target_method()->set_vtable_index(i); |
0 | 356 #ifndef PRODUCT |
652
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357 if (PrintVtables && Verbose) { |
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358 tty->print("overriding with %s::%s index %d, original flags: ", |
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359 _klass->internal_name(), (target_method() != NULL) ? |
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360 target_method()->name()->as_C_string() : "<NULL>", i); |
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361 super_method->access_flags().print_on(tty); |
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362 tty->print("overriders flags: "); |
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363 target_method->access_flags().print_on(tty); |
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364 tty->cr(); |
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365 } |
0 | 366 #endif /*PRODUCT*/ |
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367 } else { |
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368 // allocate_new = true; default. We might override one entry, |
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369 // but not override another. Once we override one, not need new |
0 | 370 #ifndef PRODUCT |
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371 if (PrintVtables && Verbose) { |
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372 tty->print("NOT overriding with %s::%s index %d, original flags: ", |
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373 _klass->internal_name(), (target_method() != NULL) ? |
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374 target_method()->name()->as_C_string() : "<NULL>", i); |
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375 super_method->access_flags().print_on(tty); |
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376 tty->print("overriders flags: "); |
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377 target_method->access_flags().print_on(tty); |
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378 tty->cr(); |
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379 } |
0 | 380 #endif /*PRODUCT*/ |
381 } | |
382 } | |
383 } | |
384 return allocate_new; | |
385 } | |
386 | |
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387 void klassVtable::put_method_at(Method* m, int index) { |
0 | 388 #ifndef PRODUCT |
389 if (PrintVtables && Verbose) { | |
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390 ResourceMark rm; |
0 | 391 tty->print_cr("adding %s::%s at index %d", _klass->internal_name(), |
392 (m != NULL) ? m->name()->as_C_string() : "<NULL>", index); | |
393 } | |
394 #endif | |
395 table()[index].set(m); | |
396 } | |
397 | |
398 // Find out if a method "m" with superclass "super", loader "classloader" and | |
399 // name "classname" needs a new vtable entry. Let P be a class package defined | |
400 // by "classloader" and "classname". | |
401 // NOTE: The logic used here is very similar to the one used for computing | |
402 // the vtables indices for a method. We cannot directly use that function because, | |
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403 // we allocate the InstanceKlass at load time, and that requires that the |
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404 // superclass has been loaded. |
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405 // However, the vtable entries are filled in at link time, and therefore |
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406 // the superclass' vtable may not yet have been filled in. |
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407 bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
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408 Klass* super, |
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409 Handle classloader, |
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410 Symbol* classname, |
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411 AccessFlags class_flags, |
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412 TRAPS) { |
6934 | 413 |
414 if (method_is_effectively_final(class_flags, target_method) || | |
0 | 415 // a final method never needs a new entry; final methods can be statically |
416 // resolved and they have to be present in the vtable only if they override | |
417 // a super's method, in which case they re-use its entry | |
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418 (target_method()->is_static()) || |
0 | 419 // static methods don't need to be in vtable |
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420 (target_method()->name() == vmSymbols::object_initializer_name()) |
0 | 421 // <init> is never called dynamically-bound |
422 ) { | |
423 return false; | |
424 } | |
425 | |
426 // we need a new entry if there is no superclass | |
427 if (super == NULL) { | |
428 return true; | |
429 } | |
430 | |
431 // private methods always have a new entry in the vtable | |
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432 // specification interpretation since classic has |
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433 // private methods not overriding |
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434 if (target_method()->is_private()) { |
0 | 435 return true; |
436 } | |
437 | |
438 // search through the super class hierarchy to see if we need | |
439 // a new entry | |
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440 ResourceMark rm; |
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441 Symbol* name = target_method()->name(); |
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442 Symbol* signature = target_method()->signature(); |
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443 Klass* k = super; |
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444 Method* super_method = NULL; |
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445 InstanceKlass *holder = NULL; |
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446 Method* recheck_method = NULL; |
0 | 447 while (k != NULL) { |
448 // lookup through the hierarchy for a method with matching name and sign. | |
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449 super_method = InstanceKlass::cast(k)->lookup_method(name, signature); |
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450 if (super_method == NULL) { |
0 | 451 break; // we still have to search for a matching miranda method |
452 } | |
453 // get the class holding the matching method | |
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454 // make sure you use that class for is_override |
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455 InstanceKlass* superk = super_method->method_holder(); |
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456 // we want only instance method matches |
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457 // pretend private methods are not in the super vtable |
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458 // since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
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459 // ignore private, c.m pub does override a.m pub |
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460 // For classes that were not javac'd together, we also do transitive overriding around |
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461 // methods that have less accessibility |
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462 if ((!super_method->is_static()) && |
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463 (!super_method->is_private())) { |
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464 if (superk->is_override(super_method, classloader, classname, THREAD)) { |
0 | 465 return false; |
652
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466 // else keep looking for transitive overrides |
0 | 467 } |
468 } | |
469 | |
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470 // Start with lookup result and continue to search up |
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471 k = superk->super(); // haven't found an override match yet; continue to look |
0 | 472 } |
473 | |
474 // if the target method is public or protected it may have a matching | |
475 // miranda method in the super, whose entry it should re-use. | |
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476 // Actually, to handle cases that javac would not generate, we need |
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477 // this check for all access permissions. |
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478 InstanceKlass *sk = InstanceKlass::cast(super); |
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479 if (sk->has_miranda_methods()) { |
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480 if (sk->lookup_method_in_all_interfaces(name, signature) != NULL) { |
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481 return false; // found a matching miranda; we do not need a new entry |
0 | 482 } |
483 } | |
484 return true; // found no match; we need a new entry | |
485 } | |
486 | |
487 // Support for miranda methods | |
488 | |
489 // get the vtable index of a miranda method with matching "name" and "signature" | |
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490 int klassVtable::index_of_miranda(Symbol* name, Symbol* signature) { |
0 | 491 // search from the bottom, might be faster |
492 for (int i = (length() - 1); i >= 0; i--) { | |
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493 Method* m = table()[i].method(); |
0 | 494 if (is_miranda_entry_at(i) && |
495 m->name() == name && m->signature() == signature) { | |
496 return i; | |
497 } | |
498 } | |
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499 return Method::invalid_vtable_index; |
0 | 500 } |
501 | |
502 // check if an entry is miranda | |
503 bool klassVtable::is_miranda_entry_at(int i) { | |
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504 Method* m = method_at(i); |
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505 Klass* method_holder = m->method_holder(); |
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506 InstanceKlass *mhk = InstanceKlass::cast(method_holder); |
0 | 507 |
508 // miranda methods are interface methods in a class's vtable | |
509 if (mhk->is_interface()) { | |
6934 | 510 assert(m->is_public(), "should be public"); |
0 | 511 assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); |
512 assert(is_miranda(m, ik()->methods(), ik()->super()), "should be a miranda_method"); | |
513 return true; | |
514 } | |
515 return false; | |
516 } | |
517 | |
518 // check if a method is a miranda method, given a class's methods table and it's super | |
519 // the caller must make sure that the method belongs to an interface implemented by the class | |
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520 bool klassVtable::is_miranda(Method* m, Array<Method*>* class_methods, Klass* super) { |
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521 Symbol* name = m->name(); |
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522 Symbol* signature = m->signature(); |
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523 if (InstanceKlass::find_method(class_methods, name, signature) == NULL) { |
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524 // did not find it in the method table of the current class |
0 | 525 if (super == NULL) { |
526 // super doesn't exist | |
527 return true; | |
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528 } |
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529 |
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530 Method* mo = InstanceKlass::cast(super)->lookup_method(name, signature); |
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531 if (mo == NULL || mo->access_flags().is_private() ) { |
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532 // super class hierarchy does not implement it or protection is different |
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533 return true; |
0 | 534 } |
535 } | |
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536 |
0 | 537 return false; |
538 } | |
539 | |
6934 | 540 void klassVtable::add_new_mirandas_to_lists( |
541 GrowableArray<Method*>* new_mirandas, GrowableArray<Method*>* all_mirandas, | |
542 Array<Method*>* current_interface_methods, Array<Method*>* class_methods, | |
543 Klass* super) { | |
0 | 544 // iterate thru the current interface's method to see if it a miranda |
545 int num_methods = current_interface_methods->length(); | |
546 for (int i = 0; i < num_methods; i++) { | |
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547 Method* im = current_interface_methods->at(i); |
0 | 548 bool is_duplicate = false; |
6934 | 549 int num_of_current_mirandas = new_mirandas->length(); |
0 | 550 // check for duplicate mirandas in different interfaces we implement |
551 for (int j = 0; j < num_of_current_mirandas; j++) { | |
6934 | 552 Method* miranda = new_mirandas->at(j); |
0 | 553 if ((im->name() == miranda->name()) && |
554 (im->signature() == miranda->signature())) { | |
555 is_duplicate = true; | |
556 break; | |
557 } | |
558 } | |
559 | |
560 if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable | |
561 if (is_miranda(im, class_methods, super)) { // is it a miranda at all? | |
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562 InstanceKlass *sk = InstanceKlass::cast(super); |
0 | 563 // check if it is a duplicate of a super's miranda |
564 if (sk->lookup_method_in_all_interfaces(im->name(), im->signature()) == NULL) { | |
6934 | 565 new_mirandas->append(im); |
566 } | |
567 if (all_mirandas != NULL) { | |
568 all_mirandas->append(im); | |
0 | 569 } |
570 } | |
571 } | |
572 } | |
573 } | |
574 | |
6934 | 575 void klassVtable::get_mirandas(GrowableArray<Method*>* new_mirandas, |
576 GrowableArray<Method*>* all_mirandas, | |
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577 Klass* super, Array<Method*>* class_methods, |
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578 Array<Klass*>* local_interfaces) { |
6934 | 579 assert((new_mirandas->length() == 0) , "current mirandas must be 0"); |
0 | 580 |
581 // iterate thru the local interfaces looking for a miranda | |
582 int num_local_ifs = local_interfaces->length(); | |
583 for (int i = 0; i < num_local_ifs; i++) { | |
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584 InstanceKlass *ik = InstanceKlass::cast(local_interfaces->at(i)); |
6934 | 585 add_new_mirandas_to_lists(new_mirandas, all_mirandas, |
586 ik->methods(), class_methods, super); | |
0 | 587 // iterate thru each local's super interfaces |
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588 Array<Klass*>* super_ifs = ik->transitive_interfaces(); |
0 | 589 int num_super_ifs = super_ifs->length(); |
590 for (int j = 0; j < num_super_ifs; j++) { | |
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591 InstanceKlass *sik = InstanceKlass::cast(super_ifs->at(j)); |
6934 | 592 add_new_mirandas_to_lists(new_mirandas, all_mirandas, |
593 sik->methods(), class_methods, super); | |
0 | 594 } |
595 } | |
596 } | |
597 | |
598 // fill in mirandas | |
6934 | 599 void klassVtable::fill_in_mirandas(int* initialized) { |
600 GrowableArray<Method*> mirandas(20); | |
601 get_mirandas(&mirandas, NULL, ik()->super(), ik()->methods(), | |
602 ik()->local_interfaces()); | |
603 for (int i = 0; i < mirandas.length(); i++) { | |
604 put_method_at(mirandas.at(i), *initialized); | |
605 ++(*initialized); | |
0 | 606 } |
607 } | |
608 | |
609 void klassVtable::copy_vtable_to(vtableEntry* start) { | |
610 Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); | |
611 } | |
612 | |
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613 #if INCLUDE_JVMTI |
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614 void klassVtable::adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 615 int methods_length, bool * trace_name_printed) { |
616 // search the vtable for uses of either obsolete or EMCP methods | |
617 for (int j = 0; j < methods_length; j++) { | |
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618 Method* old_method = old_methods[j]; |
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619 Method* new_method = new_methods[j]; |
0 | 620 |
621 // In the vast majority of cases we could get the vtable index | |
622 // by using: old_method->vtable_index() | |
623 // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() | |
624 // in sun.awt.X11.XFramePeer where methods occur more than once in the | |
625 // vtable, so, alas, we must do an exhaustive search. | |
626 for (int index = 0; index < length(); index++) { | |
627 if (unchecked_method_at(index) == old_method) { | |
628 put_method_at(new_method, index); | |
629 | |
630 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
631 if (!(*trace_name_printed)) { | |
632 // RC_TRACE_MESG macro has an embedded ResourceMark | |
633 RC_TRACE_MESG(("adjust: name=%s", | |
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634 old_method->method_holder()->external_name())); |
0 | 635 *trace_name_printed = true; |
636 } | |
637 // RC_TRACE macro has an embedded ResourceMark | |
638 RC_TRACE(0x00100000, ("vtable method update: %s(%s)", | |
639 new_method->name()->as_C_string(), | |
640 new_method->signature()->as_C_string())); | |
641 } | |
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642 // cannot 'break' here; see for-loop comment above. |
0 | 643 } |
644 } | |
645 } | |
646 } | |
647 | |
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648 // a vtable should never contain old or obsolete methods |
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649 bool klassVtable::check_no_old_or_obsolete_entries() { |
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650 for (int i = 0; i < length(); i++) { |
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651 Method* m = unchecked_method_at(i); |
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652 if (m != NULL && |
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653 (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) { |
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654 return false; |
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655 } |
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656 } |
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657 return true; |
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658 } |
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659 |
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660 void klassVtable::dump_vtable() { |
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661 tty->print_cr("vtable dump --"); |
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662 for (int i = 0; i < length(); i++) { |
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663 Method* m = unchecked_method_at(i); |
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664 if (m != NULL) { |
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665 tty->print(" (%5d) ", i); |
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666 m->access_flags().print_on(tty); |
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667 tty->print(" -- "); |
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668 m->print_name(tty); |
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669 tty->cr(); |
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670 } |
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671 } |
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672 } |
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673 #endif // INCLUDE_JVMTI |
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674 |
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675 // CDS/RedefineClasses support - clear vtables so they can be reinitialized |
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676 void klassVtable::clear_vtable() { |
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677 for (int i = 0; i < _length; i++) table()[i].clear(); |
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678 } |
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679 |
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680 bool klassVtable::is_initialized() { |
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681 return _length == 0 || table()[0].method() != NULL; |
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682 } |
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683 |
0 | 684 //----------------------------------------------------------------------------------------- |
685 // Itable code | |
686 | |
687 // Initialize a itableMethodEntry | |
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688 void itableMethodEntry::initialize(Method* m) { |
0 | 689 if (m == NULL) return; |
690 | |
691 _method = m; | |
692 } | |
693 | |
694 klassItable::klassItable(instanceKlassHandle klass) { | |
695 _klass = klass; | |
696 | |
697 if (klass->itable_length() > 0) { | |
698 itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); | |
699 if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized | |
700 // First offset entry points to the first method_entry | |
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701 intptr_t* method_entry = (intptr_t *)(((address)klass()) + offset_entry->offset()); |
0 | 702 intptr_t* end = klass->end_of_itable(); |
703 | |
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704 _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass(); |
0 | 705 _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); |
706 _size_method_table = (end - method_entry) / itableMethodEntry::size(); | |
707 assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); | |
708 return; | |
709 } | |
710 } | |
711 | |
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712 // The length of the itable was either zero, or it has not yet been initialized. |
0 | 713 _table_offset = 0; |
714 _size_offset_table = 0; | |
715 _size_method_table = 0; | |
716 } | |
717 | |
718 static int initialize_count = 0; | |
719 | |
720 // Initialization | |
721 void klassItable::initialize_itable(bool checkconstraints, TRAPS) { | |
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722 // Cannot be setup doing bootstrapping, interfaces don't have |
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723 // itables, and klass with only ones entry have empty itables |
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724 if (Universe::is_bootstrapping() || |
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725 _klass->is_interface() || |
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726 _klass->itable_length() == itableOffsetEntry::size()) return; |
0 | 727 |
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728 // There's alway an extra itable entry so we can null-terminate it. |
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729 guarantee(size_offset_table() >= 1, "too small"); |
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730 int num_interfaces = size_offset_table() - 1; |
0 | 731 if (num_interfaces > 0) { |
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732 if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
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733 _klass->name()->as_C_string()); |
0 | 734 |
735 | |
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736 // Iterate through all interfaces |
0 | 737 int i; |
738 for(i = 0; i < num_interfaces; i++) { | |
739 itableOffsetEntry* ioe = offset_entry(i); | |
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740 HandleMark hm(THREAD); |
0 | 741 KlassHandle interf_h (THREAD, ioe->interface_klass()); |
742 assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); | |
743 initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); | |
744 } | |
745 | |
746 } | |
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747 // Check that the last entry is empty |
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748 itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
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749 guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
0 | 750 } |
751 | |
752 | |
753 void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { | |
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754 Array<Method*>* methods = InstanceKlass::cast(interf_h())->methods(); |
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755 int nof_methods = methods->length(); |
0 | 756 HandleMark hm; |
757 KlassHandle klass = _klass; | |
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758 assert(nof_methods > 0, "at least one method must exist for interface to be in vtable"); |
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759 Handle interface_loader (THREAD, InstanceKlass::cast(interf_h())->class_loader()); |
0 | 760 int ime_num = 0; |
761 | |
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762 // Skip first Method* if it is a class initializer |
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763 int i = methods->at(0)->is_static_initializer() ? 1 : 0; |
0 | 764 |
765 // m, method_name, method_signature, klass reset each loop so they | |
766 // don't need preserving across check_signature_loaders call | |
767 // methods needs a handle in case of gc from check_signature_loaders | |
768 for(; i < nof_methods; i++) { | |
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769 Method* m = methods->at(i); |
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770 Symbol* method_name = m->name(); |
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771 Symbol* method_signature = m->signature(); |
0 | 772 |
773 // This is same code as in Linkresolver::lookup_instance_method_in_klasses | |
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774 Method* target = klass->uncached_lookup_method(method_name, method_signature); |
0 | 775 while (target != NULL && target->is_static()) { |
776 // continue with recursive lookup through the superclass | |
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777 Klass* super = target->method_holder()->super(); |
6983 | 778 target = (super == NULL) ? (Method*)NULL : super->uncached_lookup_method(method_name, method_signature); |
0 | 779 } |
780 if (target == NULL || !target->is_public() || target->is_abstract()) { | |
781 // Entry do not resolve. Leave it empty | |
782 } else { | |
783 // Entry did resolve, check loader constraints before initializing | |
784 // if checkconstraints requested | |
785 methodHandle target_h (THREAD, target); // preserve across gc | |
786 if (checkconstraints) { | |
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787 Handle method_holder_loader (THREAD, target->method_holder()->class_loader()); |
0 | 788 if (method_holder_loader() != interface_loader()) { |
789 ResourceMark rm(THREAD); | |
790 char* failed_type_name = | |
791 SystemDictionary::check_signature_loaders(method_signature, | |
792 method_holder_loader, | |
793 interface_loader, | |
794 true, CHECK); | |
795 if (failed_type_name != NULL) { | |
796 const char* msg = "loader constraint violation in interface " | |
797 "itable initialization: when resolving method \"%s\" the class" | |
798 " loader (instance of %s) of the current class, %s, " | |
799 "and the class loader (instance of %s) for interface " | |
800 "%s have different Class objects for the type %s " | |
801 "used in the signature"; | |
802 char* sig = target_h()->name_and_sig_as_C_string(); | |
803 const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); | |
804 char* current = klass->name()->as_C_string(); | |
805 const char* loader2 = SystemDictionary::loader_name(interface_loader()); | |
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806 char* iface = InstanceKlass::cast(interf_h())->name()->as_C_string(); |
0 | 807 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
808 strlen(current) + strlen(loader2) + strlen(iface) + | |
809 strlen(failed_type_name); | |
810 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
811 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
812 iface, failed_type_name); | |
813 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
814 } | |
815 } | |
816 } | |
817 | |
818 // ime may have moved during GC so recalculate address | |
819 itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target_h()); | |
820 } | |
821 // Progress to next entry | |
822 ime_num++; | |
823 } | |
824 } | |
825 | |
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826 // Update entry for specific Method* |
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827 void klassItable::initialize_with_method(Method* m) { |
0 | 828 itableMethodEntry* ime = method_entry(0); |
829 for(int i = 0; i < _size_method_table; i++) { | |
830 if (ime->method() == m) { | |
831 ime->initialize(m); | |
832 } | |
833 ime++; | |
834 } | |
835 } | |
836 | |
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837 #if INCLUDE_JVMTI |
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838 void klassItable::adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 839 int methods_length, bool * trace_name_printed) { |
840 // search the itable for uses of either obsolete or EMCP methods | |
841 for (int j = 0; j < methods_length; j++) { | |
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842 Method* old_method = old_methods[j]; |
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843 Method* new_method = new_methods[j]; |
0 | 844 itableMethodEntry* ime = method_entry(0); |
845 | |
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846 // The itable can describe more than one interface and the same |
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847 // method signature can be specified by more than one interface. |
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848 // This means we have to do an exhaustive search to find all the |
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849 // old_method references. |
0 | 850 for (int i = 0; i < _size_method_table; i++) { |
851 if (ime->method() == old_method) { | |
852 ime->initialize(new_method); | |
853 | |
854 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
855 if (!(*trace_name_printed)) { | |
856 // RC_TRACE_MESG macro has an embedded ResourceMark | |
857 RC_TRACE_MESG(("adjust: name=%s", | |
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858 old_method->method_holder()->external_name())); |
0 | 859 *trace_name_printed = true; |
860 } | |
861 // RC_TRACE macro has an embedded ResourceMark | |
862 RC_TRACE(0x00200000, ("itable method update: %s(%s)", | |
863 new_method->name()->as_C_string(), | |
864 new_method->signature()->as_C_string())); | |
865 } | |
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866 // cannot 'break' here; see for-loop comment above. |
0 | 867 } |
868 ime++; | |
869 } | |
870 } | |
871 } | |
872 | |
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873 // an itable should never contain old or obsolete methods |
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874 bool klassItable::check_no_old_or_obsolete_entries() { |
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875 itableMethodEntry* ime = method_entry(0); |
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876 for (int i = 0; i < _size_method_table; i++) { |
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877 Method* m = ime->method(); |
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878 if (m != NULL && |
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879 (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) { |
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880 return false; |
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881 } |
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882 ime++; |
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883 } |
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884 return true; |
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885 } |
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886 |
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887 void klassItable::dump_itable() { |
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888 itableMethodEntry* ime = method_entry(0); |
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889 tty->print_cr("itable dump --"); |
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890 for (int i = 0; i < _size_method_table; i++) { |
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891 Method* m = ime->method(); |
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892 if (m != NULL) { |
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893 tty->print(" (%5d) ", i); |
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894 m->access_flags().print_on(tty); |
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895 tty->print(" -- "); |
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896 m->print_name(tty); |
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897 tty->cr(); |
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898 } |
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899 ime++; |
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900 } |
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901 } |
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902 #endif // INCLUDE_JVMTI |
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903 |
0 | 904 |
905 // Setup | |
906 class InterfaceVisiterClosure : public StackObj { | |
907 public: | |
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908 virtual void doit(Klass* intf, int method_count) = 0; |
0 | 909 }; |
910 | |
911 // Visit all interfaces with at-least one method (excluding <clinit>) | |
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912 void visit_all_interfaces(Array<Klass*>* transitive_intf, InterfaceVisiterClosure *blk) { |
0 | 913 // Handle array argument |
914 for(int i = 0; i < transitive_intf->length(); i++) { | |
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915 Klass* intf = transitive_intf->at(i); |
6983 | 916 assert(intf->is_interface(), "sanity check"); |
0 | 917 |
918 // Find no. of methods excluding a <clinit> | |
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919 int method_count = InstanceKlass::cast(intf)->methods()->length(); |
0 | 920 if (method_count > 0) { |
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921 Method* m = InstanceKlass::cast(intf)->methods()->at(0); |
0 | 922 assert(m != NULL && m->is_method(), "sanity check"); |
923 if (m->name() == vmSymbols::object_initializer_name()) { | |
924 method_count--; | |
925 } | |
926 } | |
927 | |
928 // Only count interfaces with at least one method | |
929 if (method_count > 0) { | |
930 blk->doit(intf, method_count); | |
931 } | |
932 } | |
933 } | |
934 | |
935 class CountInterfacesClosure : public InterfaceVisiterClosure { | |
936 private: | |
937 int _nof_methods; | |
938 int _nof_interfaces; | |
939 public: | |
940 CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } | |
941 | |
942 int nof_methods() const { return _nof_methods; } | |
943 int nof_interfaces() const { return _nof_interfaces; } | |
944 | |
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945 void doit(Klass* intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } |
0 | 946 }; |
947 | |
948 class SetupItableClosure : public InterfaceVisiterClosure { | |
949 private: | |
950 itableOffsetEntry* _offset_entry; | |
951 itableMethodEntry* _method_entry; | |
952 address _klass_begin; | |
953 public: | |
954 SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { | |
955 _klass_begin = klass_begin; | |
956 _offset_entry = offset_entry; | |
957 _method_entry = method_entry; | |
958 } | |
959 | |
960 itableMethodEntry* method_entry() const { return _method_entry; } | |
961 | |
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962 void doit(Klass* intf, int method_count) { |
0 | 963 int offset = ((address)_method_entry) - _klass_begin; |
964 _offset_entry->initialize(intf, offset); | |
965 _offset_entry++; | |
966 _method_entry += method_count; | |
967 } | |
968 }; | |
969 | |
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970 int klassItable::compute_itable_size(Array<Klass*>* transitive_interfaces) { |
0 | 971 // Count no of interfaces and total number of interface methods |
972 CountInterfacesClosure cic; | |
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973 visit_all_interfaces(transitive_interfaces, &cic); |
0 | 974 |
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975 // There's alway an extra itable entry so we can null-terminate it. |
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976 int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
0 | 977 |
978 // Statistics | |
979 update_stats(itable_size * HeapWordSize); | |
980 | |
981 return itable_size; | |
982 } | |
983 | |
984 | |
985 // Fill out offset table and interface klasses into the itable space | |
986 void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { | |
987 if (klass->itable_length() == 0) return; | |
988 assert(!klass->is_interface(), "Should have zero length itable"); | |
989 | |
990 // Count no of interfaces and total number of interface methods | |
991 CountInterfacesClosure cic; | |
992 visit_all_interfaces(klass->transitive_interfaces(), &cic); | |
993 int nof_methods = cic.nof_methods(); | |
994 int nof_interfaces = cic.nof_interfaces(); | |
995 | |
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996 // Add one extra entry so we can null-terminate the table |
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997 nof_interfaces++; |
0 | 998 |
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999 assert(compute_itable_size(klass->transitive_interfaces()) == |
0 | 1000 calc_itable_size(nof_interfaces, nof_methods), |
1001 "mismatch calculation of itable size"); | |
1002 | |
1003 // Fill-out offset table | |
1004 itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); | |
1005 itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); | |
1006 intptr_t* end = klass->end_of_itable(); | |
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1007 assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_nonstatic_oop_maps(), "wrong offset calculation (1)"); |
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1008 assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
0 | 1009 |
1010 // Visit all interfaces and initialize itable offset table | |
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1011 SetupItableClosure sic((address)klass(), ioe, ime); |
0 | 1012 visit_all_interfaces(klass->transitive_interfaces(), &sic); |
1013 | |
1014 #ifdef ASSERT | |
1015 ime = sic.method_entry(); | |
1016 oop* v = (oop*) klass->end_of_itable(); | |
1017 assert( (oop*)(ime) == v, "wrong offset calculation (2)"); | |
1018 #endif | |
1019 } | |
1020 | |
1021 | |
1022 // m must be a method in an interface | |
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1023 int klassItable::compute_itable_index(Method* m) { |
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1024 InstanceKlass* intf = m->method_holder(); |
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1025 assert(intf->is_interface(), "sanity check"); |
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1026 Array<Method*>* methods = intf->methods(); |
0 | 1027 int index = 0; |
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1028 while(methods->at(index) != m) { |
0 | 1029 index++; |
1030 assert(index < methods->length(), "should find index for resolve_invoke"); | |
1031 } | |
1032 // Adjust for <clinit>, which is left out of table if first method | |
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1033 if (methods->length() > 0 && methods->at(0)->is_static_initializer()) { |
0 | 1034 index--; |
1035 } | |
1036 return index; | |
1037 } | |
1038 | |
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1039 |
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1040 // inverse to compute_itable_index |
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1041 Method* klassItable::method_for_itable_index(Klass* intf, int itable_index) { |
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1042 assert(InstanceKlass::cast(intf)->is_interface(), "sanity check"); |
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1043 Array<Method*>* methods = InstanceKlass::cast(intf)->methods(); |
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1044 |
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1045 int index = itable_index; |
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1046 // Adjust for <clinit>, which is left out of table if first method |
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1047 if (methods->length() > 0 && methods->at(0)->is_static_initializer()) { |
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1048 index++; |
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1049 } |
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1050 |
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1051 if (itable_index < 0 || index >= methods->length()) |
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1052 return NULL; // help caller defend against bad indexes |
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1053 |
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1054 Method* m = methods->at(index); |
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1055 assert(compute_itable_index(m) == itable_index, "correct inverse"); |
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1056 |
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1057 return m; |
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1058 } |
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1059 |
0 | 1060 void klassVtable::verify(outputStream* st, bool forced) { |
1061 // make sure table is initialized | |
1062 if (!Universe::is_fully_initialized()) return; | |
1063 #ifndef PRODUCT | |
1064 // avoid redundant verifies | |
1065 if (!forced && _verify_count == Universe::verify_count()) return; | |
1066 _verify_count = Universe::verify_count(); | |
1067 #endif | |
1068 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
1069 oop* end_of_vtable = (oop *)&table()[_length]; | |
1070 if (end_of_vtable > end_of_obj) { | |
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1071 fatal(err_msg("klass %s: klass object too short (vtable extends beyond " |
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1072 "end)", _klass->internal_name())); |
0 | 1073 } |
1074 | |
1075 for (int i = 0; i < _length; i++) table()[i].verify(this, st); | |
1076 // verify consistency with superKlass vtable | |
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1077 Klass* super = _klass->super(); |
0 | 1078 if (super != NULL) { |
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1079 InstanceKlass* sk = InstanceKlass::cast(super); |
0 | 1080 klassVtable* vt = sk->vtable(); |
1081 for (int i = 0; i < vt->length(); i++) { | |
1082 verify_against(st, vt, i); | |
1083 } | |
1084 } | |
1085 } | |
1086 | |
1087 void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { | |
1088 vtableEntry* vte = &vt->table()[index]; | |
1089 if (vte->method()->name() != table()[index].method()->name() || | |
1090 vte->method()->signature() != table()[index].method()->signature()) { | |
1091 fatal("mismatched name/signature of vtable entries"); | |
1092 } | |
1093 } | |
1094 | |
1095 #ifndef PRODUCT | |
1096 void klassVtable::print() { | |
1097 ResourceMark rm; | |
1098 tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); | |
1099 for (int i = 0; i < length(); i++) { | |
1100 table()[i].print(); | |
1101 tty->cr(); | |
1102 } | |
1103 } | |
1104 #endif | |
1105 | |
1106 void vtableEntry::verify(klassVtable* vt, outputStream* st) { | |
1107 NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); | |
1108 assert(method() != NULL, "must have set method"); | |
1109 method()->verify(); | |
1110 // we sub_type, because it could be a miranda method | |
1111 if (!vt->klass()->is_subtype_of(method()->method_holder())) { | |
1112 #ifndef PRODUCT | |
1113 print(); | |
1114 #endif | |
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1115 fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this)); |
0 | 1116 } |
1117 } | |
1118 | |
1119 #ifndef PRODUCT | |
1120 | |
1121 void vtableEntry::print() { | |
1122 ResourceMark rm; | |
1123 tty->print("vtableEntry %s: ", method()->name()->as_C_string()); | |
1124 if (Verbose) { | |
1125 tty->print("m %#lx ", (address)method()); | |
1126 } | |
1127 } | |
1128 | |
1129 class VtableStats : AllStatic { | |
1130 public: | |
1131 static int no_klasses; // # classes with vtables | |
1132 static int no_array_klasses; // # array classes | |
1133 static int no_instance_klasses; // # instanceKlasses | |
1134 static int sum_of_vtable_len; // total # of vtable entries | |
1135 static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only | |
1136 static int fixed; // total fixed overhead in bytes | |
1137 static int filler; // overhead caused by filler bytes | |
1138 static int entries; // total bytes consumed by vtable entries | |
1139 static int array_entries; // total bytes consumed by array vtable entries | |
1140 | |
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1141 static void do_class(Klass* k) { |
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1142 Klass* kl = k; |
0 | 1143 klassVtable* vt = kl->vtable(); |
1144 if (vt == NULL) return; | |
1145 no_klasses++; | |
1146 if (kl->oop_is_instance()) { | |
1147 no_instance_klasses++; | |
1148 kl->array_klasses_do(do_class); | |
1149 } | |
1150 if (kl->oop_is_array()) { | |
1151 no_array_klasses++; | |
1152 sum_of_array_vtable_len += vt->length(); | |
1153 } | |
1154 sum_of_vtable_len += vt->length(); | |
1155 } | |
1156 | |
1157 static void compute() { | |
1158 SystemDictionary::classes_do(do_class); | |
1159 fixed = no_klasses * oopSize; // vtable length | |
1160 // filler size is a conservative approximation | |
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1161 filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(InstanceKlass) - sizeof(ArrayKlass) - 1); |
0 | 1162 entries = sizeof(vtableEntry) * sum_of_vtable_len; |
1163 array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; | |
1164 } | |
1165 }; | |
1166 | |
1167 int VtableStats::no_klasses = 0; | |
1168 int VtableStats::no_array_klasses = 0; | |
1169 int VtableStats::no_instance_klasses = 0; | |
1170 int VtableStats::sum_of_vtable_len = 0; | |
1171 int VtableStats::sum_of_array_vtable_len = 0; | |
1172 int VtableStats::fixed = 0; | |
1173 int VtableStats::filler = 0; | |
1174 int VtableStats::entries = 0; | |
1175 int VtableStats::array_entries = 0; | |
1176 | |
1177 void klassVtable::print_statistics() { | |
1178 ResourceMark rm; | |
1179 HandleMark hm; | |
1180 VtableStats::compute(); | |
1181 tty->print_cr("vtable statistics:"); | |
1182 tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); | |
1183 int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; | |
1184 tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); | |
1185 tty->print_cr("%6d bytes filler overhead", VtableStats::filler); | |
1186 tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); | |
1187 tty->print_cr("%6d bytes total", total); | |
1188 } | |
1189 | |
1190 int klassItable::_total_classes; // Total no. of classes with itables | |
1191 long klassItable::_total_size; // Total no. of bytes used for itables | |
1192 | |
1193 void klassItable::print_statistics() { | |
1194 tty->print_cr("itable statistics:"); | |
1195 tty->print_cr("%6d classes with itables", _total_classes); | |
1196 tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); | |
1197 } | |
1198 | |
1199 #endif // PRODUCT |