Mercurial > hg > truffle
annotate src/share/vm/oops/klassVtable.cpp @ 15306:7e0563f0d249
Rename LIRFrameStateBuilder to BaselineFrameStateBuilder.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Tue, 22 Apr 2014 20:16:38 +0200 |
parents | 4ca6dc0799b6 |
children | 89152779163c |
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 | |
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50 // methods) and the number of miranda methods in this class. |
0 | 51 // Note on Miranda methods: Let's say there is a class C that implements |
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52 // interface I, and none of C's superclasses implements I. |
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53 // Let's say there is an abstract method m in I that neither C |
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54 // nor any of its super classes implement (i.e there is no method of any access, |
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55 // with the same name and signature as m), then m is a Miranda method which is |
0 | 56 // entered as a public abstract method in C's vtable. From then on it should |
57 // treated as any other public method in C for method over-ride purposes. | |
6934 | 58 void klassVtable::compute_vtable_size_and_num_mirandas( |
59 int* vtable_length_ret, int* num_new_mirandas, | |
60 GrowableArray<Method*>* all_mirandas, Klass* super, | |
61 Array<Method*>* methods, AccessFlags class_flags, | |
62 Handle classloader, Symbol* classname, Array<Klass*>* local_interfaces, | |
63 TRAPS) { | |
0 | 64 No_Safepoint_Verifier nsv; |
65 | |
66 // set up default result values | |
6934 | 67 int vtable_length = 0; |
0 | 68 |
69 // start off with super's vtable length | |
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70 InstanceKlass* sk = (InstanceKlass*)super; |
0 | 71 vtable_length = super == NULL ? 0 : sk->vtable_length(); |
72 | |
73 // go thru each method in the methods table to see if it needs a new entry | |
74 int len = methods->length(); | |
75 for (int i = 0; i < len; i++) { | |
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76 assert(methods->at(i)->is_method(), "must be a Method*"); |
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77 methodHandle mh(THREAD, methods->at(i)); |
0 | 78 |
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79 if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
0 | 80 vtable_length += vtableEntry::size(); // we need a new entry |
81 } | |
82 } | |
83 | |
6934 | 84 GrowableArray<Method*> new_mirandas(20); |
0 | 85 // compute the number of mirandas methods that must be added to the end |
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86 get_mirandas(&new_mirandas, all_mirandas, super, methods, NULL, local_interfaces); |
6934 | 87 *num_new_mirandas = new_mirandas.length(); |
88 | |
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89 // Interfaces do not need interface methods in their vtables |
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90 // This includes miranda methods and during later processing, default methods |
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91 if (!class_flags.is_interface()) { |
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92 vtable_length += *num_new_mirandas * vtableEntry::size(); |
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93 } |
0 | 94 |
95 if (Universe::is_bootstrapping() && vtable_length == 0) { | |
96 // array classes don't have their superclass set correctly during | |
97 // bootstrapping | |
98 vtable_length = Universe::base_vtable_size(); | |
99 } | |
100 | |
101 if (super == NULL && !Universe::is_bootstrapping() && | |
102 vtable_length != Universe::base_vtable_size()) { | |
103 // Someone is attempting to redefine java.lang.Object incorrectly. The | |
104 // only way this should happen is from | |
105 // SystemDictionary::resolve_from_stream(), which will detect this later | |
106 // and throw a security exception. So don't assert here to let | |
107 // the exception occur. | |
108 vtable_length = Universe::base_vtable_size(); | |
109 } | |
110 assert(super != NULL || vtable_length == Universe::base_vtable_size(), | |
111 "bad vtable size for class Object"); | |
112 assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); | |
113 assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); | |
6934 | 114 |
115 *vtable_length_ret = vtable_length; | |
0 | 116 } |
117 | |
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118 int klassVtable::index_of(Method* m, int len) const { |
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119 assert(m->has_vtable_index(), "do not ask this of non-vtable methods"); |
0 | 120 return m->vtable_index(); |
121 } | |
122 | |
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123 // Copy super class's vtable to the first part (prefix) of this class's vtable, |
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124 // and return the number of entries copied. Expects that 'super' is the Java |
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125 // super class (arrays can have "array" super classes that must be skipped). |
0 | 126 int klassVtable::initialize_from_super(KlassHandle super) { |
127 if (super.is_null()) { | |
128 return 0; | |
129 } else { | |
130 // copy methods from superKlass | |
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131 // can't inherit from array class, so must be InstanceKlass |
0 | 132 assert(super->oop_is_instance(), "must be instance klass"); |
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133 InstanceKlass* sk = (InstanceKlass*)super(); |
0 | 134 klassVtable* superVtable = sk->vtable(); |
135 assert(superVtable->length() <= _length, "vtable too short"); | |
136 #ifdef ASSERT | |
137 superVtable->verify(tty, true); | |
138 #endif | |
139 superVtable->copy_vtable_to(table()); | |
140 #ifndef PRODUCT | |
141 if (PrintVtables && Verbose) { | |
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142 ResourceMark rm; |
0 | 143 tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
144 } | |
145 #endif | |
146 return superVtable->length(); | |
147 } | |
148 } | |
149 | |
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150 // |
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151 // Revised lookup semantics introduced 1.3 (Kestrel beta) |
0 | 152 void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { |
153 | |
154 // Note: Arrays can have intermediate array supers. Use java_super to skip them. | |
155 KlassHandle super (THREAD, klass()->java_super()); | |
156 int nofNewEntries = 0; | |
157 | |
158 if (PrintVtables && !klass()->oop_is_array()) { | |
159 ResourceMark rm(THREAD); | |
160 tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); | |
161 } | |
162 | |
163 #ifdef ASSERT | |
164 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
165 oop* end_of_vtable = (oop*)&table()[_length]; | |
166 assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); | |
167 #endif | |
168 | |
169 if (Universe::is_bootstrapping()) { | |
170 // just clear everything | |
171 for (int i = 0; i < _length; i++) table()[i].clear(); | |
172 return; | |
173 } | |
174 | |
175 int super_vtable_len = initialize_from_super(super); | |
176 if (klass()->oop_is_array()) { | |
177 assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); | |
178 } else { | |
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179 assert(_klass->oop_is_instance(), "must be InstanceKlass"); |
0 | 180 |
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181 Array<Method*>* methods = ik()->methods(); |
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182 int len = methods->length(); |
0 | 183 int initialized = super_vtable_len; |
184 | |
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185 // Check each of this class's methods against super; |
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186 // if override, replace in copy of super vtable, otherwise append to end |
0 | 187 for (int i = 0; i < len; i++) { |
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188 // update_inherited_vtable can stop for gc - ensure using handles |
0 | 189 HandleMark hm(THREAD); |
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190 assert(methods->at(i)->is_method(), "must be a Method*"); |
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191 methodHandle mh(THREAD, methods->at(i)); |
0 | 192 |
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193 bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, -1, checkconstraints, CHECK); |
0 | 194 |
195 if (needs_new_entry) { | |
196 put_method_at(mh(), initialized); | |
197 mh()->set_vtable_index(initialized); // set primary vtable index | |
198 initialized++; | |
199 } | |
200 } | |
201 | |
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202 // update vtable with default_methods |
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203 Array<Method*>* default_methods = ik()->default_methods(); |
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204 if (default_methods != NULL) { |
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205 len = default_methods->length(); |
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206 if (len > 0) { |
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207 Array<int>* def_vtable_indices = NULL; |
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208 if ((def_vtable_indices = ik()->default_vtable_indices()) == NULL) { |
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209 def_vtable_indices = ik()->create_new_default_vtable_indices(len, CHECK); |
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210 } else { |
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211 assert(def_vtable_indices->length() == len, "reinit vtable len?"); |
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212 } |
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213 for (int i = 0; i < len; i++) { |
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214 HandleMark hm(THREAD); |
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215 assert(default_methods->at(i)->is_method(), "must be a Method*"); |
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216 methodHandle mh(THREAD, default_methods->at(i)); |
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217 |
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218 bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, i, checkconstraints, CHECK); |
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219 |
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220 // needs new entry |
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221 if (needs_new_entry) { |
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222 put_method_at(mh(), initialized); |
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223 def_vtable_indices->at_put(i, initialized); //set vtable index |
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224 initialized++; |
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225 } |
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226 } |
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227 } |
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228 } |
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229 |
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230 // add miranda methods; it will also return the updated initialized |
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231 // Interfaces do not need interface methods in their vtables |
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232 // This includes miranda methods and during later processing, default methods |
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233 if (!ik()->is_interface()) { |
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234 initialized = fill_in_mirandas(initialized); |
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235 } |
0 | 236 |
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237 // In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
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238 // package_private -> public/protected), the vtable might actually be smaller than our initial |
0 | 239 // calculation. |
240 assert(initialized <= _length, "vtable initialization failed"); | |
241 for(;initialized < _length; initialized++) { | |
242 put_method_at(NULL, initialized); | |
243 } | |
244 NOT_PRODUCT(verify(tty, true)); | |
245 } | |
246 } | |
247 | |
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248 // Called for cases where a method does not override its superclass' vtable entry |
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249 // For bytecodes not produced by javac together it is possible that a method does not override |
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250 // the superclass's method, but might indirectly override a super-super class's vtable entry |
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251 // If none found, return a null superk, else return the superk of the method this does override |
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252 InstanceKlass* klassVtable::find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, |
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253 int vtable_index, Handle target_loader, Symbol* target_classname, Thread * THREAD) { |
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254 InstanceKlass* superk = initialsuper; |
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255 while (superk != NULL && superk->super() != NULL) { |
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256 InstanceKlass* supersuperklass = InstanceKlass::cast(superk->super()); |
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257 klassVtable* ssVtable = supersuperklass->vtable(); |
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258 if (vtable_index < ssVtable->length()) { |
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259 Method* super_method = ssVtable->method_at(vtable_index); |
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260 #ifndef PRODUCT |
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261 Symbol* name= target_method()->name(); |
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262 Symbol* signature = target_method()->signature(); |
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263 assert(super_method->name() == name && super_method->signature() == signature, "vtable entry name/sig mismatch"); |
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264 #endif |
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265 if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
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266 #ifndef PRODUCT |
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267 if (PrintVtables && Verbose) { |
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268 ResourceMark rm(THREAD); |
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269 char* sig = target_method()->name_and_sig_as_C_string(); |
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270 tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
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271 supersuperklass->internal_name(), |
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272 _klass->internal_name(), sig, vtable_index); |
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273 super_method->access_flags().print_on(tty); |
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274 if (super_method->is_default_method()) { |
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275 tty->print("default "); |
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276 } |
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277 tty->print("overriders flags: "); |
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278 target_method->access_flags().print_on(tty); |
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279 if (target_method->is_default_method()) { |
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280 tty->print("default "); |
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281 } |
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282 } |
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283 #endif /*PRODUCT*/ |
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284 break; // return found superk |
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285 } |
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286 } else { |
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287 // super class has no vtable entry here, stop transitive search |
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288 superk = (InstanceKlass*)NULL; |
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289 break; |
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290 } |
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291 // if no override found yet, continue to search up |
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292 superk = InstanceKlass::cast(superk->super()); |
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293 } |
0 | 294 |
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295 return superk; |
0 | 296 } |
297 | |
298 // Update child's copy of super vtable for overrides | |
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299 // OR return true if a new vtable entry is required. |
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300 // Only called for InstanceKlass's, i.e. not for arrays |
0 | 301 // If that changed, could not use _klass as handle for klass |
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302 bool klassVtable::update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, |
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303 int super_vtable_len, int default_index, |
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304 bool checkconstraints, TRAPS) { |
0 | 305 ResourceMark rm; |
306 bool allocate_new = true; | |
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307 assert(klass->oop_is_instance(), "must be InstanceKlass"); |
0 | 308 |
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309 Array<int>* def_vtable_indices = NULL; |
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310 bool is_default = false; |
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311 // default methods are concrete methods in superinterfaces which are added to the vtable |
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312 // with their real method_holder |
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313 // Since vtable and itable indices share the same storage, don't touch |
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314 // the default method's real vtable/itable index |
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315 // default_vtable_indices stores the vtable value relative to this inheritor |
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316 if (default_index >= 0 ) { |
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317 is_default = true; |
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318 def_vtable_indices = klass->default_vtable_indices(); |
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319 assert(def_vtable_indices != NULL, "def vtable alloc?"); |
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320 assert(default_index <= def_vtable_indices->length(), "def vtable len?"); |
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321 } else { |
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322 assert(klass == target_method()->method_holder(), "caller resp."); |
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323 // Initialize the method's vtable index to "nonvirtual". |
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324 // If we allocate a vtable entry, we will update it to a non-negative number. |
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325 target_method()->set_vtable_index(Method::nonvirtual_vtable_index); |
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326 } |
0 | 327 |
328 // Static and <init> methods are never in | |
329 if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { | |
330 return false; | |
331 } | |
332 | |
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333 if (target_method->is_final_method(klass->access_flags())) { |
0 | 334 // a final method never needs a new entry; final methods can be statically |
335 // resolved and they have to be present in the vtable only if they override | |
336 // a super's method, in which case they re-use its entry | |
337 allocate_new = false; | |
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338 } else if (klass->is_interface()) { |
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339 allocate_new = false; // see note below in needs_new_vtable_entry |
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340 // An interface never allocates new vtable slots, only inherits old ones. |
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341 // This method will either be assigned its own itable index later, |
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342 // or be assigned an inherited vtable index in the loop below. |
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343 // default methods inherited by classes store their vtable indices |
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344 // in the inheritor's default_vtable_indices |
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345 // default methods inherited by interfaces may already have a |
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346 // valid itable index, if so, don't change it |
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347 // overpass methods in an interface will be assigned an itable index later |
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348 // by an inheriting class |
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349 if (!is_default || !target_method()->has_itable_index()) { |
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350 target_method()->set_vtable_index(Method::pending_itable_index); |
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351 } |
0 | 352 } |
353 | |
354 // we need a new entry if there is no superclass | |
355 if (klass->super() == NULL) { | |
356 return allocate_new; | |
357 } | |
358 | |
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359 // private methods in classes always have a new entry in the vtable |
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360 // specification interpretation since classic has |
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361 // private methods not overriding |
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362 // JDK8 adds private methods in interfaces which require invokespecial |
0 | 363 if (target_method()->is_private()) { |
364 return allocate_new; | |
365 } | |
366 | |
367 // search through the vtable and update overridden entries | |
368 // Since check_signature_loaders acquires SystemDictionary_lock | |
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369 // which can block for gc, once we are in this loop, use handles |
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370 // For classfiles built with >= jdk7, we now look for transitive overrides |
0 | 371 |
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372 Symbol* name = target_method()->name(); |
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373 Symbol* signature = target_method()->signature(); |
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374 |
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375 KlassHandle target_klass(THREAD, target_method()->method_holder()); |
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376 if (target_klass == NULL) { |
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377 target_klass = _klass; |
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378 } |
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379 |
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380 Handle target_loader(THREAD, target_klass->class_loader()); |
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381 |
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382 Symbol* target_classname = target_klass->name(); |
0 | 383 for(int i = 0; i < super_vtable_len; i++) { |
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384 Method* super_method = method_at(i); |
0 | 385 // Check if method name matches |
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386 if (super_method->name() == name && super_method->signature() == signature) { |
0 | 387 |
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388 // get super_klass for method_holder for the found method |
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389 InstanceKlass* super_klass = super_method->method_holder(); |
0 | 390 |
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391 if (is_default |
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392 || ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) |
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393 || ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
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394 && ((super_klass = find_transitive_override(super_klass, |
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395 target_method, i, target_loader, |
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396 target_classname, THREAD)) |
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397 != (InstanceKlass*)NULL)))) |
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398 { |
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399 // overriding, so no new entry |
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400 allocate_new = false; |
0 | 401 |
402 if (checkconstraints) { | |
403 // Override vtable entry if passes loader constraint check | |
404 // if loader constraint checking requested | |
405 // No need to visit his super, since he and his super | |
406 // have already made any needed loader constraints. | |
407 // Since loader constraints are transitive, it is enough | |
408 // to link to the first super, and we get all the others. | |
409 Handle super_loader(THREAD, super_klass->class_loader()); | |
410 | |
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411 if (target_loader() != super_loader()) { |
0 | 412 ResourceMark rm(THREAD); |
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413 Symbol* failed_type_symbol = |
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414 SystemDictionary::check_signature_loaders(signature, target_loader, |
0 | 415 super_loader, true, |
416 CHECK_(false)); | |
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417 if (failed_type_symbol != NULL) { |
0 | 418 const char* msg = "loader constraint violation: when resolving " |
419 "overridden method \"%s\" the class loader (instance" | |
420 " of %s) of the current class, %s, and its superclass loader " | |
421 "(instance of %s), have different Class objects for the type " | |
422 "%s used in the signature"; | |
423 char* sig = target_method()->name_and_sig_as_C_string(); | |
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424 const char* loader1 = SystemDictionary::loader_name(target_loader()); |
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425 char* current = target_klass->name()->as_C_string(); |
0 | 426 const char* loader2 = SystemDictionary::loader_name(super_loader()); |
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427 char* failed_type_name = failed_type_symbol->as_C_string(); |
0 | 428 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
429 strlen(current) + strlen(loader2) + strlen(failed_type_name); | |
430 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
431 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
432 failed_type_name); | |
433 THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); | |
434 } | |
435 } | |
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436 } |
0 | 437 |
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438 put_method_at(target_method(), i); |
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439 if (!is_default) { |
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440 target_method()->set_vtable_index(i); |
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441 } else { |
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442 if (def_vtable_indices != NULL) { |
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443 def_vtable_indices->at_put(default_index, i); |
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444 } |
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445 assert(super_method->is_default_method() || super_method->is_overpass() |
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446 || super_method->is_abstract(), "default override error"); |
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447 } |
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448 |
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449 |
0 | 450 #ifndef PRODUCT |
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451 if (PrintVtables && Verbose) { |
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452 ResourceMark rm(THREAD); |
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453 char* sig = target_method()->name_and_sig_as_C_string(); |
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454 tty->print("overriding with %s::%s index %d, original flags: ", |
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455 target_klass->internal_name(), sig, i); |
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456 super_method->access_flags().print_on(tty); |
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457 if (super_method->is_default_method()) { |
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458 tty->print("default "); |
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459 } |
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460 if (super_method->is_overpass()) { |
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461 tty->print("overpass"); |
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462 } |
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463 tty->print("overriders flags: "); |
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464 target_method->access_flags().print_on(tty); |
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465 if (target_method->is_default_method()) { |
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466 tty->print("default "); |
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467 } |
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468 if (target_method->is_overpass()) { |
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469 tty->print("overpass"); |
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470 } |
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471 tty->cr(); |
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472 } |
0 | 473 #endif /*PRODUCT*/ |
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474 } else { |
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475 // allocate_new = true; default. We might override one entry, |
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476 // but not override another. Once we override one, not need new |
0 | 477 #ifndef PRODUCT |
652
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478 if (PrintVtables && Verbose) { |
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479 ResourceMark rm(THREAD); |
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480 char* sig = target_method()->name_and_sig_as_C_string(); |
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481 tty->print("NOT overriding with %s::%s index %d, original flags: ", |
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482 target_klass->internal_name(), sig,i); |
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483 super_method->access_flags().print_on(tty); |
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484 if (super_method->is_default_method()) { |
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485 tty->print("default "); |
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486 } |
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487 if (super_method->is_overpass()) { |
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488 tty->print("overpass"); |
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489 } |
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490 tty->print("overriders flags: "); |
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491 target_method->access_flags().print_on(tty); |
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492 if (target_method->is_default_method()) { |
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493 tty->print("default "); |
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494 } |
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495 if (target_method->is_overpass()) { |
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496 tty->print("overpass"); |
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497 } |
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498 tty->cr(); |
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499 } |
0 | 500 #endif /*PRODUCT*/ |
501 } | |
502 } | |
503 } | |
504 return allocate_new; | |
505 } | |
506 | |
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507 void klassVtable::put_method_at(Method* m, int index) { |
0 | 508 #ifndef PRODUCT |
509 if (PrintVtables && Verbose) { | |
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510 ResourceMark rm; |
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511 const char* sig = (m != NULL) ? m->name_and_sig_as_C_string() : "<NULL>"; |
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512 tty->print("adding %s at index %d, flags: ", sig, index); |
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513 if (m != NULL) { |
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514 m->access_flags().print_on(tty); |
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515 if (m->is_default_method()) { |
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516 tty->print("default "); |
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517 } |
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518 if (m->is_overpass()) { |
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519 tty->print("overpass"); |
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520 } |
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521 } |
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522 tty->cr(); |
0 | 523 } |
524 #endif | |
525 table()[index].set(m); | |
526 } | |
527 | |
528 // Find out if a method "m" with superclass "super", loader "classloader" and | |
529 // name "classname" needs a new vtable entry. Let P be a class package defined | |
530 // by "classloader" and "classname". | |
531 // NOTE: The logic used here is very similar to the one used for computing | |
532 // the vtables indices for a method. We cannot directly use that function because, | |
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533 // we allocate the InstanceKlass at load time, and that requires that the |
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534 // superclass has been loaded. |
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535 // However, the vtable entries are filled in at link time, and therefore |
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536 // the superclass' vtable may not yet have been filled in. |
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537 bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
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538 Klass* super, |
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539 Handle classloader, |
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540 Symbol* classname, |
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541 AccessFlags class_flags, |
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542 TRAPS) { |
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543 if (class_flags.is_interface()) { |
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544 // Interfaces do not use vtables, so there is no point to assigning |
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545 // a vtable index to any of their methods. If we refrain from doing this, |
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546 // we can use Method::_vtable_index to hold the itable index |
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547 return false; |
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548 } |
6934 | 549 |
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550 if (target_method->is_final_method(class_flags) || |
0 | 551 // a final method never needs a new entry; final methods can be statically |
552 // resolved and they have to be present in the vtable only if they override | |
553 // a super's method, in which case they re-use its entry | |
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554 (target_method()->is_static()) || |
0 | 555 // static methods don't need to be in vtable |
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556 (target_method()->name() == vmSymbols::object_initializer_name()) |
0 | 557 // <init> is never called dynamically-bound |
558 ) { | |
559 return false; | |
560 } | |
561 | |
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562 // Concrete interface methods do not need new entries, they override |
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563 // abstract method entries using default inheritance rules |
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564 if (target_method()->method_holder() != NULL && |
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565 target_method()->method_holder()->is_interface() && |
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566 !target_method()->is_abstract() ) { |
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567 return false; |
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568 } |
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569 |
0 | 570 // we need a new entry if there is no superclass |
571 if (super == NULL) { | |
572 return true; | |
573 } | |
574 | |
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575 // private methods in classes always have a new entry in the vtable |
652
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acorn
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diff
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|
576 // specification interpretation since classic has |
4aaa9f5e02a8
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acorn
parents:
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diff
changeset
|
577 // private methods not overriding |
12823
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578 // JDK8 adds private methods in interfaces which require invokespecial |
652
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acorn
parents:
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diff
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|
579 if (target_method()->is_private()) { |
0 | 580 return true; |
581 } | |
582 | |
583 // search through the super class hierarchy to see if we need | |
584 // a new entry | |
652
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acorn
parents:
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diff
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|
585 ResourceMark rm; |
2177
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|
586 Symbol* name = target_method()->name(); |
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587 Symbol* signature = target_method()->signature(); |
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588 Klass* k = super; |
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589 Method* super_method = NULL; |
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590 InstanceKlass *holder = NULL; |
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591 Method* recheck_method = NULL; |
0 | 592 while (k != NULL) { |
593 // lookup through the hierarchy for a method with matching name and sign. | |
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594 super_method = InstanceKlass::cast(k)->lookup_method(name, signature); |
652
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595 if (super_method == NULL) { |
0 | 596 break; // we still have to search for a matching miranda method |
597 } | |
598 // get the class holding the matching method | |
652
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acorn
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599 // make sure you use that class for is_override |
6940
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8000725: NPG: method_holder() and pool_holder() and pool_holder field should be InstanceKlass
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parents:
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diff
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|
600 InstanceKlass* superk = super_method->method_holder(); |
652
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601 // we want only instance method matches |
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602 // pretend private methods are not in the super vtable |
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|
603 // since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
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diff
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604 // ignore private, c.m pub does override a.m pub |
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diff
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605 // For classes that were not javac'd together, we also do transitive overriding around |
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|
606 // methods that have less accessibility |
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diff
changeset
|
607 if ((!super_method->is_static()) && |
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parents:
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diff
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|
608 (!super_method->is_private())) { |
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acorn
parents:
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diff
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|
609 if (superk->is_override(super_method, classloader, classname, THREAD)) { |
0 | 610 return false; |
652
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acorn
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diff
changeset
|
611 // else keep looking for transitive overrides |
0 | 612 } |
613 } | |
614 | |
652
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|
615 // Start with lookup result and continue to search up |
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|
616 k = superk->super(); // haven't found an override match yet; continue to look |
0 | 617 } |
618 | |
619 // if the target method is public or protected it may have a matching | |
620 // miranda method in the super, whose entry it should re-use. | |
652
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|
621 // Actually, to handle cases that javac would not generate, we need |
4aaa9f5e02a8
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diff
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|
622 // this check for all access permissions. |
6725
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623 InstanceKlass *sk = InstanceKlass::cast(super); |
652
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|
624 if (sk->has_miranda_methods()) { |
14909 | 625 if (sk->lookup_method_in_all_interfaces(name, signature) != NULL) { |
652
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|
626 return false; // found a matching miranda; we do not need a new entry |
0 | 627 } |
628 } | |
629 return true; // found no match; we need a new entry | |
630 } | |
631 | |
632 // Support for miranda methods | |
633 | |
634 // get the vtable index of a miranda method with matching "name" and "signature" | |
2177
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|
635 int klassVtable::index_of_miranda(Symbol* name, Symbol* signature) { |
0 | 636 // search from the bottom, might be faster |
637 for (int i = (length() - 1); i >= 0; i--) { | |
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638 Method* m = table()[i].method(); |
0 | 639 if (is_miranda_entry_at(i) && |
640 m->name() == name && m->signature() == signature) { | |
641 return i; | |
642 } | |
643 } | |
6725
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|
644 return Method::invalid_vtable_index; |
0 | 645 } |
646 | |
12264
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|
647 // check if an entry at an index is miranda |
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648 // requires that method m at entry be declared ("held") by an interface. |
0 | 649 bool klassVtable::is_miranda_entry_at(int i) { |
6725
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650 Method* m = method_at(i); |
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651 Klass* method_holder = m->method_holder(); |
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652 InstanceKlass *mhk = InstanceKlass::cast(method_holder); |
0 | 653 |
12318
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654 // miranda methods are public abstract instance interface methods in a class's vtable |
0 | 655 if (mhk->is_interface()) { |
6934 | 656 assert(m->is_public(), "should be public"); |
0 | 657 assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); |
13055
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658 // the search could find a miranda or a default method |
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659 if (is_miranda(m, ik()->methods(), ik()->default_methods(), ik()->super())) { |
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660 return true; |
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|
661 } |
0 | 662 } |
663 return false; | |
664 } | |
665 | |
12823
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acorn
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|
666 // check if a method is a miranda method, given a class's methods table, |
ac9cb1d5a202
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acorn
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|
667 // its default_method table and its super |
13414
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acorn
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|
668 // Miranda methods are calculated twice: |
379f11bc04fc
8028438: static superclass method masks default methods
acorn
parents:
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|
669 // first: before vtable size calculation: including abstract and default |
379f11bc04fc
8028438: static superclass method masks default methods
acorn
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|
670 // This is seen by default method creation |
379f11bc04fc
8028438: static superclass method masks default methods
acorn
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|
671 // Second: recalculated during vtable initialization: only abstract |
379f11bc04fc
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|
672 // This is seen by link resolution and selection. |
12823
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673 // "miranda" means not static, not defined by this class. |
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|
674 // private methods in interfaces do not belong in the miranda list. |
0 | 675 // the caller must make sure that the method belongs to an interface implemented by the class |
12318
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|
676 // Miranda methods only include public interface instance methods |
12823
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|
677 // Not private methods, not static methods, not default == concrete abstract |
13055
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|
678 // Miranda methods also do not include overpass methods in interfaces |
12823
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acorn
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|
679 bool klassVtable::is_miranda(Method* m, Array<Method*>* class_methods, |
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|
680 Array<Method*>* default_methods, Klass* super) { |
13055
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acorn
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|
681 if (m->is_static() || m->is_private() || m->is_overpass()) { |
10166
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8013418: assert(i == total_args_passed) in AdapterHandlerLibrary::get_adapter since 8-b87
bharadwaj
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|
682 return false; |
08236d966eea
8013418: assert(i == total_args_passed) in AdapterHandlerLibrary::get_adapter since 8-b87
bharadwaj
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|
683 } |
2177
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|
684 Symbol* name = m->name(); |
3582bf76420e
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coleenp
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|
685 Symbol* signature = m->signature(); |
13414
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|
686 |
379f11bc04fc
8028438: static superclass method masks default methods
acorn
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diff
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|
687 if (InstanceKlass::find_instance_method(class_methods, name, signature) == NULL) { |
2018
642e54d1850a
6989076: JVM crashes in klassItable::initialize_itable_for_interface
dsamersoff
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diff
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|
688 // did not find it in the method table of the current class |
12823
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|
689 if ((default_methods == NULL) || |
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acorn
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|
690 InstanceKlass::find_method(default_methods, name, signature) == NULL) { |
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acorn
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|
691 if (super == NULL) { |
ac9cb1d5a202
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acorn
parents:
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diff
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|
692 // super doesn't exist |
ac9cb1d5a202
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acorn
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|
693 return true; |
ac9cb1d5a202
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acorn
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|
694 } |
2018
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dsamersoff
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diff
changeset
|
695 |
12823
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|
696 Method* mo = InstanceKlass::cast(super)->lookup_method(name, signature); |
13414
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acorn
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|
697 while (mo != NULL && mo->access_flags().is_static() |
379f11bc04fc
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acorn
parents:
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diff
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|
698 && mo->method_holder() != NULL |
379f11bc04fc
8028438: static superclass method masks default methods
acorn
parents:
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diff
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|
699 && mo->method_holder()->super() != NULL) |
379f11bc04fc
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acorn
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|
700 { |
379f11bc04fc
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|
701 mo = mo->method_holder()->super()->uncached_lookup_method(name, signature); |
379f11bc04fc
8028438: static superclass method masks default methods
acorn
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|
702 } |
12823
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|
703 if (mo == NULL || mo->access_flags().is_private() ) { |
ac9cb1d5a202
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acorn
parents:
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|
704 // super class hierarchy does not implement it or protection is different |
ac9cb1d5a202
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acorn
parents:
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|
705 return true; |
ac9cb1d5a202
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acorn
parents:
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|
706 } |
0 | 707 } |
708 } | |
2018
642e54d1850a
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dsamersoff
parents:
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diff
changeset
|
709 |
0 | 710 return false; |
711 } | |
712 | |
12264
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drchase
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|
713 // Scans current_interface_methods for miranda methods that do not |
12823
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acorn
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|
714 // already appear in new_mirandas, or default methods, and are also not defined-and-non-private |
12264
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drchase
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|
715 // in super (superclass). These mirandas are added to all_mirandas if it is |
b2e698d2276c
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|
716 // not null; in addition, those that are not duplicates of miranda methods |
b2e698d2276c
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|
717 // inherited by super from its interfaces are added to new_mirandas. |
b2e698d2276c
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|
718 // Thus, new_mirandas will be the set of mirandas that this class introduces, |
b2e698d2276c
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|
719 // all_mirandas will be the set of all mirandas applicable to this class |
b2e698d2276c
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|
720 // including all defined in superclasses. |
6934 | 721 void klassVtable::add_new_mirandas_to_lists( |
722 GrowableArray<Method*>* new_mirandas, GrowableArray<Method*>* all_mirandas, | |
723 Array<Method*>* current_interface_methods, Array<Method*>* class_methods, | |
12823
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|
724 Array<Method*>* default_methods, Klass* super) { |
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|
725 |
0 | 726 // iterate thru the current interface's method to see if it a miranda |
727 int num_methods = current_interface_methods->length(); | |
728 for (int i = 0; i < num_methods; i++) { | |
6725
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|
729 Method* im = current_interface_methods->at(i); |
0 | 730 bool is_duplicate = false; |
6934 | 731 int num_of_current_mirandas = new_mirandas->length(); |
0 | 732 // check for duplicate mirandas in different interfaces we implement |
733 for (int j = 0; j < num_of_current_mirandas; j++) { | |
6934 | 734 Method* miranda = new_mirandas->at(j); |
0 | 735 if ((im->name() == miranda->name()) && |
736 (im->signature() == miranda->signature())) { | |
737 is_duplicate = true; | |
738 break; | |
739 } | |
740 } | |
741 | |
742 if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable | |
12823
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|
743 if (is_miranda(im, class_methods, default_methods, super)) { // is it a miranda at all? |
6725
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coleenp
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|
744 InstanceKlass *sk = InstanceKlass::cast(super); |
0 | 745 // check if it is a duplicate of a super's miranda |
14909 | 746 if (sk->lookup_method_in_all_interfaces(im->name(), im->signature()) == NULL) { |
6934 | 747 new_mirandas->append(im); |
748 } | |
749 if (all_mirandas != NULL) { | |
750 all_mirandas->append(im); | |
0 | 751 } |
752 } | |
753 } | |
754 } | |
755 } | |
756 | |
6934 | 757 void klassVtable::get_mirandas(GrowableArray<Method*>* new_mirandas, |
758 GrowableArray<Method*>* all_mirandas, | |
6725
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759 Klass* super, Array<Method*>* class_methods, |
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760 Array<Method*>* default_methods, |
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761 Array<Klass*>* local_interfaces) { |
6934 | 762 assert((new_mirandas->length() == 0) , "current mirandas must be 0"); |
0 | 763 |
764 // iterate thru the local interfaces looking for a miranda | |
765 int num_local_ifs = local_interfaces->length(); | |
766 for (int i = 0; i < num_local_ifs; i++) { | |
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767 InstanceKlass *ik = InstanceKlass::cast(local_interfaces->at(i)); |
6934 | 768 add_new_mirandas_to_lists(new_mirandas, all_mirandas, |
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769 ik->methods(), class_methods, |
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770 default_methods, super); |
0 | 771 // iterate thru each local's super interfaces |
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772 Array<Klass*>* super_ifs = ik->transitive_interfaces(); |
0 | 773 int num_super_ifs = super_ifs->length(); |
774 for (int j = 0; j < num_super_ifs; j++) { | |
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775 InstanceKlass *sik = InstanceKlass::cast(super_ifs->at(j)); |
6934 | 776 add_new_mirandas_to_lists(new_mirandas, all_mirandas, |
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777 sik->methods(), class_methods, |
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778 default_methods, super); |
0 | 779 } |
780 } | |
781 } | |
782 | |
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783 // Discover miranda methods ("miranda" = "interface abstract, no binding"), |
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784 // and append them into the vtable starting at index initialized, |
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785 // return the new value of initialized. |
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786 // Miranda methods use vtable entries, but do not get assigned a vtable_index |
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787 // The vtable_index is discovered by searching from the end of the vtable |
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788 int klassVtable::fill_in_mirandas(int initialized) { |
6934 | 789 GrowableArray<Method*> mirandas(20); |
790 get_mirandas(&mirandas, NULL, ik()->super(), ik()->methods(), | |
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791 ik()->default_methods(), ik()->local_interfaces()); |
6934 | 792 for (int i = 0; i < mirandas.length(); i++) { |
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793 if (PrintVtables && Verbose) { |
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794 Method* meth = mirandas.at(i); |
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795 ResourceMark rm(Thread::current()); |
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796 if (meth != NULL) { |
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797 char* sig = meth->name_and_sig_as_C_string(); |
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798 tty->print("fill in mirandas with %s index %d, flags: ", |
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799 sig, initialized); |
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800 meth->access_flags().print_on(tty); |
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801 if (meth->is_default_method()) { |
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802 tty->print("default "); |
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803 } |
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804 tty->cr(); |
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805 } |
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806 } |
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807 put_method_at(mirandas.at(i), initialized); |
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808 ++initialized; |
0 | 809 } |
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810 return initialized; |
0 | 811 } |
812 | |
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813 // Copy this class's vtable to the vtable beginning at start. |
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814 // Used to copy superclass vtable to prefix of subclass's vtable. |
0 | 815 void klassVtable::copy_vtable_to(vtableEntry* start) { |
816 Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); | |
817 } | |
818 | |
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819 #if INCLUDE_JVMTI |
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820 bool klassVtable::adjust_default_method(int vtable_index, Method* old_method, Method* new_method) { |
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821 // If old_method is default, find this vtable index in default_vtable_indices |
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822 // and replace that method in the _default_methods list |
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823 bool updated = false; |
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824 |
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825 Array<Method*>* default_methods = ik()->default_methods(); |
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826 if (default_methods != NULL) { |
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827 int len = default_methods->length(); |
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828 for (int idx = 0; idx < len; idx++) { |
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829 if (vtable_index == ik()->default_vtable_indices()->at(idx)) { |
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830 if (default_methods->at(idx) == old_method) { |
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831 default_methods->at_put(idx, new_method); |
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832 updated = true; |
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833 } |
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834 break; |
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|
835 } |
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836 } |
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|
837 } |
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838 return updated; |
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839 } |
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840 void klassVtable::adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 841 int methods_length, bool * trace_name_printed) { |
842 // search the vtable for uses of either obsolete or EMCP methods | |
843 for (int j = 0; j < methods_length; j++) { | |
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844 Method* old_method = old_methods[j]; |
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845 Method* new_method = new_methods[j]; |
0 | 846 |
847 // In the vast majority of cases we could get the vtable index | |
848 // by using: old_method->vtable_index() | |
849 // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() | |
850 // in sun.awt.X11.XFramePeer where methods occur more than once in the | |
851 // vtable, so, alas, we must do an exhaustive search. | |
852 for (int index = 0; index < length(); index++) { | |
853 if (unchecked_method_at(index) == old_method) { | |
854 put_method_at(new_method, index); | |
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855 // For default methods, need to update the _default_methods array |
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856 // which can only have one method entry for a given signature |
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857 bool updated_default = false; |
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858 if (old_method->is_default_method()) { |
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859 updated_default = adjust_default_method(index, old_method, new_method); |
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860 } |
0 | 861 |
862 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
863 if (!(*trace_name_printed)) { | |
864 // RC_TRACE_MESG macro has an embedded ResourceMark | |
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865 RC_TRACE_MESG(("adjust: klassname=%s for methods from name=%s", |
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866 klass()->external_name(), |
6940
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867 old_method->method_holder()->external_name())); |
0 | 868 *trace_name_printed = true; |
869 } | |
870 // RC_TRACE macro has an embedded ResourceMark | |
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871 RC_TRACE(0x00100000, ("vtable method update: %s(%s), updated default = %s", |
0 | 872 new_method->name()->as_C_string(), |
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873 new_method->signature()->as_C_string(), |
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874 updated_default ? "true" : "false")); |
0 | 875 } |
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876 // cannot 'break' here; see for-loop comment above. |
0 | 877 } |
878 } | |
879 } | |
880 } | |
881 | |
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882 // a vtable should never contain old or obsolete methods |
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883 bool klassVtable::check_no_old_or_obsolete_entries() { |
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884 for (int i = 0; i < length(); i++) { |
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885 Method* m = unchecked_method_at(i); |
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886 if (m != NULL && |
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887 (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) { |
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888 return false; |
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889 } |
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890 } |
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891 return true; |
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|
892 } |
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|
893 |
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894 void klassVtable::dump_vtable() { |
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895 tty->print_cr("vtable dump --"); |
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896 for (int i = 0; i < length(); i++) { |
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897 Method* m = unchecked_method_at(i); |
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898 if (m != NULL) { |
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899 tty->print(" (%5d) ", i); |
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900 m->access_flags().print_on(tty); |
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901 if (m->is_default_method()) { |
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902 tty->print("default "); |
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903 } |
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904 if (m->is_overpass()) { |
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905 tty->print("overpass"); |
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|
906 } |
8021
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907 tty->print(" -- "); |
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908 m->print_name(tty); |
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909 tty->cr(); |
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910 } |
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911 } |
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912 } |
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913 #endif // INCLUDE_JVMTI |
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914 |
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915 // CDS/RedefineClasses support - clear vtables so they can be reinitialized |
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916 void klassVtable::clear_vtable() { |
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917 for (int i = 0; i < _length; i++) table()[i].clear(); |
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|
918 } |
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919 |
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920 bool klassVtable::is_initialized() { |
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921 return _length == 0 || table()[0].method() != NULL; |
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922 } |
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923 |
0 | 924 //----------------------------------------------------------------------------------------- |
925 // Itable code | |
926 | |
927 // Initialize a itableMethodEntry | |
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928 void itableMethodEntry::initialize(Method* m) { |
0 | 929 if (m == NULL) return; |
930 | |
931 _method = m; | |
932 } | |
933 | |
934 klassItable::klassItable(instanceKlassHandle klass) { | |
935 _klass = klass; | |
936 | |
937 if (klass->itable_length() > 0) { | |
938 itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); | |
939 if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized | |
940 // First offset entry points to the first method_entry | |
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941 intptr_t* method_entry = (intptr_t *)(((address)klass()) + offset_entry->offset()); |
0 | 942 intptr_t* end = klass->end_of_itable(); |
943 | |
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944 _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass(); |
0 | 945 _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); |
946 _size_method_table = (end - method_entry) / itableMethodEntry::size(); | |
947 assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); | |
948 return; | |
949 } | |
950 } | |
951 | |
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952 // The length of the itable was either zero, or it has not yet been initialized. |
0 | 953 _table_offset = 0; |
954 _size_offset_table = 0; | |
955 _size_method_table = 0; | |
956 } | |
957 | |
958 static int initialize_count = 0; | |
959 | |
960 // Initialization | |
961 void klassItable::initialize_itable(bool checkconstraints, TRAPS) { | |
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962 if (_klass->is_interface()) { |
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963 // This needs to go after vtable indices are assigned but |
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964 // before implementors need to know the number of itable indices. |
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965 assign_itable_indices_for_interface(_klass()); |
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966 } |
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967 |
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968 // Cannot be setup doing bootstrapping, interfaces don't have |
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969 // itables, and klass with only ones entry have empty itables |
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970 if (Universe::is_bootstrapping() || |
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971 _klass->is_interface() || |
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972 _klass->itable_length() == itableOffsetEntry::size()) return; |
0 | 973 |
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974 // There's alway an extra itable entry so we can null-terminate it. |
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975 guarantee(size_offset_table() >= 1, "too small"); |
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976 int num_interfaces = size_offset_table() - 1; |
0 | 977 if (num_interfaces > 0) { |
16
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978 if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
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979 _klass->name()->as_C_string()); |
0 | 980 |
981 | |
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982 // Iterate through all interfaces |
0 | 983 int i; |
984 for(i = 0; i < num_interfaces; i++) { | |
985 itableOffsetEntry* ioe = offset_entry(i); | |
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986 HandleMark hm(THREAD); |
0 | 987 KlassHandle interf_h (THREAD, ioe->interface_klass()); |
988 assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); | |
989 initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); | |
990 } | |
991 | |
992 } | |
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993 // Check that the last entry is empty |
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994 itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
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995 guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
0 | 996 } |
997 | |
998 | |
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999 inline bool interface_method_needs_itable_index(Method* m) { |
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1000 if (m->is_static()) return false; // e.g., Stream.empty |
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1001 if (m->is_initializer()) return false; // <init> or <clinit> |
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1002 // If an interface redeclares a method from java.lang.Object, |
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1003 // it should already have a vtable index, don't touch it. |
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1004 // e.g., CharSequence.toString (from initialize_vtable) |
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1005 // if (m->has_vtable_index()) return false; // NO! |
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1006 return true; |
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1007 } |
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1008 |
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1009 int klassItable::assign_itable_indices_for_interface(Klass* klass) { |
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1010 // an interface does not have an itable, but its methods need to be numbered |
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1011 if (TraceItables) tty->print_cr("%3d: Initializing itable for interface %s", ++initialize_count, |
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1012 klass->name()->as_C_string()); |
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1013 Array<Method*>* methods = InstanceKlass::cast(klass)->methods(); |
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1014 int nof_methods = methods->length(); |
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1015 int ime_num = 0; |
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1016 for (int i = 0; i < nof_methods; i++) { |
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1017 Method* m = methods->at(i); |
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1018 if (interface_method_needs_itable_index(m)) { |
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1019 assert(!m->is_final_method(), "no final interface methods"); |
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1020 // If m is already assigned a vtable index, do not disturb it. |
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1021 if (TraceItables && Verbose) { |
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1022 ResourceMark rm; |
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1023 const char* sig = (m != NULL) ? m->name_and_sig_as_C_string() : "<NULL>"; |
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1024 if (m->has_vtable_index()) { |
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1025 tty->print("itable index %d for method: %s, flags: ", m->vtable_index(), sig); |
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1026 } else { |
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1027 tty->print("itable index %d for method: %s, flags: ", ime_num, sig); |
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1028 } |
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1029 if (m != NULL) { |
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1030 m->access_flags().print_on(tty); |
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1031 if (m->is_default_method()) { |
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1032 tty->print("default "); |
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1033 } |
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1034 if (m->is_overpass()) { |
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1035 tty->print("overpass"); |
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1036 } |
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1037 } |
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1038 tty->cr(); |
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1039 } |
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1040 if (!m->has_vtable_index()) { |
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1041 assert(m->vtable_index() == Method::pending_itable_index, "set by initialize_vtable"); |
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1042 m->set_itable_index(ime_num); |
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1043 // Progress to next itable entry |
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1044 ime_num++; |
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1045 } |
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1046 } |
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1047 } |
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1048 assert(ime_num == method_count_for_interface(klass), "proper sizing"); |
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1049 return ime_num; |
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1050 } |
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1051 |
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1052 int klassItable::method_count_for_interface(Klass* interf) { |
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1053 assert(interf->oop_is_instance(), "must be"); |
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1054 assert(interf->is_interface(), "must be"); |
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1055 Array<Method*>* methods = InstanceKlass::cast(interf)->methods(); |
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1056 int nof_methods = methods->length(); |
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1057 while (nof_methods > 0) { |
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1058 Method* m = methods->at(nof_methods-1); |
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1059 if (m->has_itable_index()) { |
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1060 int length = m->itable_index() + 1; |
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1061 #ifdef ASSERT |
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1062 while (nof_methods = 0) { |
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1063 m = methods->at(--nof_methods); |
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1064 assert(!m->has_itable_index() || m->itable_index() < length, ""); |
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1065 } |
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1066 #endif //ASSERT |
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1067 return length; // return the rightmost itable index, plus one |
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1068 } |
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1069 nof_methods -= 1; |
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1070 } |
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1071 // no methods have itable indices |
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1072 return 0; |
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1073 } |
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1074 |
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1075 |
0 | 1076 void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { |
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1077 Array<Method*>* methods = InstanceKlass::cast(interf_h())->methods(); |
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1078 int nof_methods = methods->length(); |
0 | 1079 HandleMark hm; |
1489
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|
1080 assert(nof_methods > 0, "at least one method must exist for interface to be in vtable"); |
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1081 Handle interface_loader (THREAD, InstanceKlass::cast(interf_h())->class_loader()); |
0 | 1082 |
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1083 int ime_count = method_count_for_interface(interf_h()); |
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1084 for (int i = 0; i < nof_methods; i++) { |
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1085 Method* m = methods->at(i); |
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1086 methodHandle target; |
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1087 if (m->has_itable_index()) { |
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1088 LinkResolver::lookup_instance_method_in_klasses(target, _klass, m->name(), m->signature(), CHECK); |
0 | 1089 } |
1090 if (target == NULL || !target->is_public() || target->is_abstract()) { | |
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1091 // Entry does not resolve. Leave it empty for AbstractMethodError. |
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1092 if (!(target == NULL) && !target->is_public()) { |
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1093 // Stuff an IllegalAccessError throwing method in there instead. |
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1094 itableOffsetEntry::method_entry(_klass(), method_table_offset)[m->itable_index()]. |
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1095 initialize(Universe::throw_illegal_access_error()); |
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1096 } |
0 | 1097 } else { |
1098 // Entry did resolve, check loader constraints before initializing | |
1099 // if checkconstraints requested | |
1100 if (checkconstraints) { | |
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1101 Handle method_holder_loader (THREAD, target->method_holder()->class_loader()); |
0 | 1102 if (method_holder_loader() != interface_loader()) { |
1103 ResourceMark rm(THREAD); | |
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1104 Symbol* failed_type_symbol = |
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1105 SystemDictionary::check_signature_loaders(m->signature(), |
0 | 1106 method_holder_loader, |
1107 interface_loader, | |
1108 true, CHECK); | |
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1109 if (failed_type_symbol != NULL) { |
0 | 1110 const char* msg = "loader constraint violation in interface " |
1111 "itable initialization: when resolving method \"%s\" the class" | |
1112 " loader (instance of %s) of the current class, %s, " | |
1113 "and the class loader (instance of %s) for interface " | |
1114 "%s have different Class objects for the type %s " | |
1115 "used in the signature"; | |
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1116 char* sig = target()->name_and_sig_as_C_string(); |
0 | 1117 const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); |
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1118 char* current = _klass->name()->as_C_string(); |
0 | 1119 const char* loader2 = SystemDictionary::loader_name(interface_loader()); |
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1120 char* iface = InstanceKlass::cast(interf_h())->name()->as_C_string(); |
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1121 char* failed_type_name = failed_type_symbol->as_C_string(); |
0 | 1122 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
1123 strlen(current) + strlen(loader2) + strlen(iface) + | |
1124 strlen(failed_type_name); | |
1125 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
1126 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
1127 iface, failed_type_name); | |
1128 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
1129 } | |
1130 } | |
1131 } | |
1132 | |
1133 // ime may have moved during GC so recalculate address | |
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1134 int ime_num = m->itable_index(); |
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1135 assert(ime_num < ime_count, "oob"); |
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1136 itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target()); |
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1137 if (TraceItables && Verbose) { |
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1138 ResourceMark rm(THREAD); |
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1139 if (target() != NULL) { |
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1140 char* sig = target()->name_and_sig_as_C_string(); |
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1141 tty->print("interface: %s, ime_num: %d, target: %s, method_holder: %s ", |
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1142 interf_h()->internal_name(), ime_num, sig, |
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1143 target()->method_holder()->internal_name()); |
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1144 tty->print("target_method flags: "); |
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1145 target()->access_flags().print_on(tty); |
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1146 if (target()->is_default_method()) { |
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1147 tty->print("default "); |
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1148 } |
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1149 tty->cr(); |
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1150 } |
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1151 } |
0 | 1152 } |
1153 } | |
1154 } | |
1155 | |
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1156 // Update entry for specific Method* |
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1157 void klassItable::initialize_with_method(Method* m) { |
0 | 1158 itableMethodEntry* ime = method_entry(0); |
1159 for(int i = 0; i < _size_method_table; i++) { | |
1160 if (ime->method() == m) { | |
1161 ime->initialize(m); | |
1162 } | |
1163 ime++; | |
1164 } | |
1165 } | |
1166 | |
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1167 #if INCLUDE_JVMTI |
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1168 void klassItable::adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 1169 int methods_length, bool * trace_name_printed) { |
1170 // search the itable for uses of either obsolete or EMCP methods | |
1171 for (int j = 0; j < methods_length; j++) { | |
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1172 Method* old_method = old_methods[j]; |
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1173 Method* new_method = new_methods[j]; |
0 | 1174 itableMethodEntry* ime = method_entry(0); |
1175 | |
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1176 // The itable can describe more than one interface and the same |
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1177 // method signature can be specified by more than one interface. |
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1178 // This means we have to do an exhaustive search to find all the |
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1179 // old_method references. |
0 | 1180 for (int i = 0; i < _size_method_table; i++) { |
1181 if (ime->method() == old_method) { | |
1182 ime->initialize(new_method); | |
1183 | |
1184 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
1185 if (!(*trace_name_printed)) { | |
1186 // RC_TRACE_MESG macro has an embedded ResourceMark | |
1187 RC_TRACE_MESG(("adjust: name=%s", | |
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1188 old_method->method_holder()->external_name())); |
0 | 1189 *trace_name_printed = true; |
1190 } | |
1191 // RC_TRACE macro has an embedded ResourceMark | |
1192 RC_TRACE(0x00200000, ("itable method update: %s(%s)", | |
1193 new_method->name()->as_C_string(), | |
1194 new_method->signature()->as_C_string())); | |
1195 } | |
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1196 // cannot 'break' here; see for-loop comment above. |
0 | 1197 } |
1198 ime++; | |
1199 } | |
1200 } | |
1201 } | |
1202 | |
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1203 // an itable should never contain old or obsolete methods |
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1204 bool klassItable::check_no_old_or_obsolete_entries() { |
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1205 itableMethodEntry* ime = method_entry(0); |
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1206 for (int i = 0; i < _size_method_table; i++) { |
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1207 Method* m = ime->method(); |
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1208 if (m != NULL && |
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1209 (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) { |
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1210 return false; |
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1211 } |
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1212 ime++; |
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1213 } |
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1214 return true; |
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1215 } |
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1216 |
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1217 void klassItable::dump_itable() { |
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1218 itableMethodEntry* ime = method_entry(0); |
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1219 tty->print_cr("itable dump --"); |
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1220 for (int i = 0; i < _size_method_table; i++) { |
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1221 Method* m = ime->method(); |
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1222 if (m != NULL) { |
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1223 tty->print(" (%5d) ", i); |
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1224 m->access_flags().print_on(tty); |
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1225 if (m->is_default_method()) { |
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1226 tty->print("default "); |
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1227 } |
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1228 tty->print(" -- "); |
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1229 m->print_name(tty); |
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1230 tty->cr(); |
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1231 } |
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1232 ime++; |
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1233 } |
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1234 } |
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1235 #endif // INCLUDE_JVMTI |
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1236 |
0 | 1237 |
1238 // Setup | |
1239 class InterfaceVisiterClosure : public StackObj { | |
1240 public: | |
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1241 virtual void doit(Klass* intf, int method_count) = 0; |
0 | 1242 }; |
1243 | |
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1244 // Visit all interfaces with at least one itable method |
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1245 void visit_all_interfaces(Array<Klass*>* transitive_intf, InterfaceVisiterClosure *blk) { |
0 | 1246 // Handle array argument |
1247 for(int i = 0; i < transitive_intf->length(); i++) { | |
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1248 Klass* intf = transitive_intf->at(i); |
6983 | 1249 assert(intf->is_interface(), "sanity check"); |
0 | 1250 |
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1251 // Find no. of itable methods |
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1252 int method_count = 0; |
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1253 // method_count = klassItable::method_count_for_interface(intf); |
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1254 Array<Method*>* methods = InstanceKlass::cast(intf)->methods(); |
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1255 if (methods->length() > 0) { |
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1256 for (int i = methods->length(); --i >= 0; ) { |
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1257 if (interface_method_needs_itable_index(methods->at(i))) { |
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1258 method_count++; |
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1259 } |
0 | 1260 } |
1261 } | |
1262 | |
1263 // Only count interfaces with at least one method | |
1264 if (method_count > 0) { | |
1265 blk->doit(intf, method_count); | |
1266 } | |
1267 } | |
1268 } | |
1269 | |
1270 class CountInterfacesClosure : public InterfaceVisiterClosure { | |
1271 private: | |
1272 int _nof_methods; | |
1273 int _nof_interfaces; | |
1274 public: | |
1275 CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } | |
1276 | |
1277 int nof_methods() const { return _nof_methods; } | |
1278 int nof_interfaces() const { return _nof_interfaces; } | |
1279 | |
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1280 void doit(Klass* intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } |
0 | 1281 }; |
1282 | |
1283 class SetupItableClosure : public InterfaceVisiterClosure { | |
1284 private: | |
1285 itableOffsetEntry* _offset_entry; | |
1286 itableMethodEntry* _method_entry; | |
1287 address _klass_begin; | |
1288 public: | |
1289 SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { | |
1290 _klass_begin = klass_begin; | |
1291 _offset_entry = offset_entry; | |
1292 _method_entry = method_entry; | |
1293 } | |
1294 | |
1295 itableMethodEntry* method_entry() const { return _method_entry; } | |
1296 | |
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1297 void doit(Klass* intf, int method_count) { |
0 | 1298 int offset = ((address)_method_entry) - _klass_begin; |
1299 _offset_entry->initialize(intf, offset); | |
1300 _offset_entry++; | |
1301 _method_entry += method_count; | |
1302 } | |
1303 }; | |
1304 | |
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1305 int klassItable::compute_itable_size(Array<Klass*>* transitive_interfaces) { |
0 | 1306 // Count no of interfaces and total number of interface methods |
1307 CountInterfacesClosure cic; | |
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1308 visit_all_interfaces(transitive_interfaces, &cic); |
0 | 1309 |
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1310 // There's alway an extra itable entry so we can null-terminate it. |
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1311 int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
0 | 1312 |
1313 // Statistics | |
1314 update_stats(itable_size * HeapWordSize); | |
1315 | |
1316 return itable_size; | |
1317 } | |
1318 | |
1319 | |
1320 // Fill out offset table and interface klasses into the itable space | |
1321 void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { | |
1322 if (klass->itable_length() == 0) return; | |
1323 assert(!klass->is_interface(), "Should have zero length itable"); | |
1324 | |
1325 // Count no of interfaces and total number of interface methods | |
1326 CountInterfacesClosure cic; | |
1327 visit_all_interfaces(klass->transitive_interfaces(), &cic); | |
1328 int nof_methods = cic.nof_methods(); | |
1329 int nof_interfaces = cic.nof_interfaces(); | |
1330 | |
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1331 // Add one extra entry so we can null-terminate the table |
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1332 nof_interfaces++; |
0 | 1333 |
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1334 assert(compute_itable_size(klass->transitive_interfaces()) == |
0 | 1335 calc_itable_size(nof_interfaces, nof_methods), |
1336 "mismatch calculation of itable size"); | |
1337 | |
1338 // Fill-out offset table | |
1339 itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); | |
1340 itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); | |
1341 intptr_t* end = klass->end_of_itable(); | |
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1342 assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_nonstatic_oop_maps(), "wrong offset calculation (1)"); |
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1343 assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
0 | 1344 |
1345 // Visit all interfaces and initialize itable offset table | |
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1346 SetupItableClosure sic((address)klass(), ioe, ime); |
0 | 1347 visit_all_interfaces(klass->transitive_interfaces(), &sic); |
1348 | |
1349 #ifdef ASSERT | |
1350 ime = sic.method_entry(); | |
1351 oop* v = (oop*) klass->end_of_itable(); | |
1352 assert( (oop*)(ime) == v, "wrong offset calculation (2)"); | |
1353 #endif | |
1354 } | |
1355 | |
1356 | |
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1357 // inverse to itable_index |
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1358 Method* klassItable::method_for_itable_index(Klass* intf, int itable_index) { |
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1359 assert(InstanceKlass::cast(intf)->is_interface(), "sanity check"); |
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1360 assert(intf->verify_itable_index(itable_index), ""); |
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1361 Array<Method*>* methods = InstanceKlass::cast(intf)->methods(); |
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1362 |
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1363 if (itable_index < 0 || itable_index >= method_count_for_interface(intf)) |
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1364 return NULL; // help caller defend against bad indices |
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1365 |
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1366 int index = itable_index; |
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1367 Method* m = methods->at(index); |
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1368 int index2 = -1; |
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1369 while (!m->has_itable_index() || |
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1370 (index2 = m->itable_index()) != itable_index) { |
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1371 assert(index2 < itable_index, "monotonic"); |
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1372 if (++index == methods->length()) |
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1373 return NULL; |
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1374 m = methods->at(index); |
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1375 } |
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1376 assert(m->itable_index() == itable_index, "correct inverse"); |
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1377 |
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1378 return m; |
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1379 } |
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1380 |
0 | 1381 void klassVtable::verify(outputStream* st, bool forced) { |
1382 // make sure table is initialized | |
1383 if (!Universe::is_fully_initialized()) return; | |
1384 #ifndef PRODUCT | |
1385 // avoid redundant verifies | |
1386 if (!forced && _verify_count == Universe::verify_count()) return; | |
1387 _verify_count = Universe::verify_count(); | |
1388 #endif | |
1389 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
1390 oop* end_of_vtable = (oop *)&table()[_length]; | |
1391 if (end_of_vtable > end_of_obj) { | |
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1392 fatal(err_msg("klass %s: klass object too short (vtable extends beyond " |
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1393 "end)", _klass->internal_name())); |
0 | 1394 } |
1395 | |
1396 for (int i = 0; i < _length; i++) table()[i].verify(this, st); | |
1397 // verify consistency with superKlass vtable | |
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1398 Klass* super = _klass->super(); |
0 | 1399 if (super != NULL) { |
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1400 InstanceKlass* sk = InstanceKlass::cast(super); |
0 | 1401 klassVtable* vt = sk->vtable(); |
1402 for (int i = 0; i < vt->length(); i++) { | |
1403 verify_against(st, vt, i); | |
1404 } | |
1405 } | |
1406 } | |
1407 | |
1408 void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { | |
1409 vtableEntry* vte = &vt->table()[index]; | |
1410 if (vte->method()->name() != table()[index].method()->name() || | |
1411 vte->method()->signature() != table()[index].method()->signature()) { | |
1412 fatal("mismatched name/signature of vtable entries"); | |
1413 } | |
1414 } | |
1415 | |
1416 #ifndef PRODUCT | |
1417 void klassVtable::print() { | |
1418 ResourceMark rm; | |
1419 tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); | |
1420 for (int i = 0; i < length(); i++) { | |
1421 table()[i].print(); | |
1422 tty->cr(); | |
1423 } | |
1424 } | |
1425 #endif | |
1426 | |
1427 void vtableEntry::verify(klassVtable* vt, outputStream* st) { | |
1428 NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); | |
1429 assert(method() != NULL, "must have set method"); | |
1430 method()->verify(); | |
1431 // we sub_type, because it could be a miranda method | |
1432 if (!vt->klass()->is_subtype_of(method()->method_holder())) { | |
1433 #ifndef PRODUCT | |
1434 print(); | |
1435 #endif | |
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1436 fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this)); |
0 | 1437 } |
1438 } | |
1439 | |
1440 #ifndef PRODUCT | |
1441 | |
1442 void vtableEntry::print() { | |
1443 ResourceMark rm; | |
1444 tty->print("vtableEntry %s: ", method()->name()->as_C_string()); | |
1445 if (Verbose) { | |
1446 tty->print("m %#lx ", (address)method()); | |
1447 } | |
1448 } | |
1449 | |
1450 class VtableStats : AllStatic { | |
1451 public: | |
1452 static int no_klasses; // # classes with vtables | |
1453 static int no_array_klasses; // # array classes | |
1454 static int no_instance_klasses; // # instanceKlasses | |
1455 static int sum_of_vtable_len; // total # of vtable entries | |
1456 static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only | |
1457 static int fixed; // total fixed overhead in bytes | |
1458 static int filler; // overhead caused by filler bytes | |
1459 static int entries; // total bytes consumed by vtable entries | |
1460 static int array_entries; // total bytes consumed by array vtable entries | |
1461 | |
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1462 static void do_class(Klass* k) { |
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1463 Klass* kl = k; |
0 | 1464 klassVtable* vt = kl->vtable(); |
1465 if (vt == NULL) return; | |
1466 no_klasses++; | |
1467 if (kl->oop_is_instance()) { | |
1468 no_instance_klasses++; | |
1469 kl->array_klasses_do(do_class); | |
1470 } | |
1471 if (kl->oop_is_array()) { | |
1472 no_array_klasses++; | |
1473 sum_of_array_vtable_len += vt->length(); | |
1474 } | |
1475 sum_of_vtable_len += vt->length(); | |
1476 } | |
1477 | |
1478 static void compute() { | |
1479 SystemDictionary::classes_do(do_class); | |
1480 fixed = no_klasses * oopSize; // vtable length | |
1481 // filler size is a conservative approximation | |
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1482 filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(InstanceKlass) - sizeof(ArrayKlass) - 1); |
0 | 1483 entries = sizeof(vtableEntry) * sum_of_vtable_len; |
1484 array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; | |
1485 } | |
1486 }; | |
1487 | |
1488 int VtableStats::no_klasses = 0; | |
1489 int VtableStats::no_array_klasses = 0; | |
1490 int VtableStats::no_instance_klasses = 0; | |
1491 int VtableStats::sum_of_vtable_len = 0; | |
1492 int VtableStats::sum_of_array_vtable_len = 0; | |
1493 int VtableStats::fixed = 0; | |
1494 int VtableStats::filler = 0; | |
1495 int VtableStats::entries = 0; | |
1496 int VtableStats::array_entries = 0; | |
1497 | |
1498 void klassVtable::print_statistics() { | |
1499 ResourceMark rm; | |
1500 HandleMark hm; | |
1501 VtableStats::compute(); | |
1502 tty->print_cr("vtable statistics:"); | |
1503 tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); | |
1504 int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; | |
1505 tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); | |
1506 tty->print_cr("%6d bytes filler overhead", VtableStats::filler); | |
1507 tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); | |
1508 tty->print_cr("%6d bytes total", total); | |
1509 } | |
1510 | |
1511 int klassItable::_total_classes; // Total no. of classes with itables | |
1512 long klassItable::_total_size; // Total no. of bytes used for itables | |
1513 | |
1514 void klassItable::print_statistics() { | |
1515 tty->print_cr("itable statistics:"); | |
1516 tty->print_cr("%6d classes with itables", _total_classes); | |
1517 tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); | |
1518 } | |
1519 | |
1520 #endif // PRODUCT |