Mercurial > hg > graal-compiler
annotate src/share/vm/ci/ciInstanceKlass.cpp @ 4316:b4b16e4e043f
Fix eager resolving for class constants
author | Peter Hofer <peter.hofer@jku.at> |
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date | Mon, 23 Jan 2012 14:35:29 +0100 |
parents | 716a2c5c0656 |
children | 33df1aeaebbf |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/ciField.hpp" | |
27 #include "ci/ciInstance.hpp" | |
28 #include "ci/ciInstanceKlass.hpp" | |
29 #include "ci/ciUtilities.hpp" | |
30 #include "classfile/systemDictionary.hpp" | |
31 #include "memory/allocation.hpp" | |
32 #include "memory/allocation.inline.hpp" | |
33 #include "oops/oop.inline.hpp" | |
3938 | 34 #include "oops/fieldStreams.hpp" |
1972 | 35 #include "runtime/fieldDescriptor.hpp" |
0 | 36 |
37 // ciInstanceKlass | |
38 // | |
39 // This class represents a klassOop in the HotSpot virtual machine | |
40 // whose Klass part in an instanceKlass. | |
41 | |
42 // ------------------------------------------------------------------ | |
43 // ciInstanceKlass::ciInstanceKlass | |
44 // | |
45 // Loaded instance klass. | |
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46 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) : |
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47 ciKlass(h_k), _non_static_fields(NULL) |
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48 { |
0 | 49 assert(get_Klass()->oop_is_instance(), "wrong type"); |
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50 assert(get_instanceKlass()->is_loaded(), "must be at least loaded"); |
0 | 51 instanceKlass* ik = get_instanceKlass(); |
52 | |
53 AccessFlags access_flags = ik->access_flags(); | |
54 _flags = ciFlags(access_flags); | |
55 _has_finalizer = access_flags.has_finalizer(); | |
56 _has_subklass = ik->subklass() != NULL; | |
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57 _init_state = (instanceKlass::ClassState)ik->get_init_state(); |
0 | 58 _nonstatic_field_size = ik->nonstatic_field_size(); |
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59 _has_nonstatic_fields = ik->has_nonstatic_fields(); |
0 | 60 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields: |
61 | |
62 _nof_implementors = ik->nof_implementors(); | |
63 for (int i = 0; i < implementors_limit; i++) { | |
64 _implementors[i] = NULL; // we will fill these lazily | |
65 } | |
66 | |
67 Thread *thread = Thread::current(); | |
68 if (ciObjectFactory::is_initialized()) { | |
69 _loader = JNIHandles::make_local(thread, ik->class_loader()); | |
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70 _protection_domain = JNIHandles::make_local(thread, |
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71 ik->protection_domain()); |
0 | 72 _is_shared = false; |
73 } else { | |
74 Handle h_loader(thread, ik->class_loader()); | |
75 Handle h_protection_domain(thread, ik->protection_domain()); | |
76 _loader = JNIHandles::make_global(h_loader); | |
77 _protection_domain = JNIHandles::make_global(h_protection_domain); | |
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78 _is_shared = true; |
0 | 79 } |
80 | |
81 // Lazy fields get filled in only upon request. | |
82 _super = NULL; | |
83 _java_mirror = NULL; | |
84 | |
85 if (is_shared()) { | |
1142 | 86 if (h_k() != SystemDictionary::Object_klass()) { |
0 | 87 super(); |
88 } | |
89 //compute_nonstatic_fields(); // done outside of constructor | |
90 } | |
91 | |
92 _field_cache = NULL; | |
93 } | |
94 | |
95 // Version for unloaded classes: | |
96 ciInstanceKlass::ciInstanceKlass(ciSymbol* name, | |
97 jobject loader, jobject protection_domain) | |
98 : ciKlass(name, ciInstanceKlassKlass::make()) | |
99 { | |
100 assert(name->byte_at(0) != '[', "not an instance klass"); | |
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101 _init_state = (instanceKlass::ClassState)0; |
0 | 102 _nonstatic_field_size = -1; |
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103 _has_nonstatic_fields = false; |
0 | 104 _nonstatic_fields = NULL; |
105 _nof_implementors = -1; | |
106 _loader = loader; | |
107 _protection_domain = protection_domain; | |
108 _is_shared = false; | |
109 _super = NULL; | |
110 _java_mirror = NULL; | |
111 _field_cache = NULL; | |
112 } | |
113 | |
114 | |
115 | |
116 // ------------------------------------------------------------------ | |
117 // ciInstanceKlass::compute_shared_is_initialized | |
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118 void ciInstanceKlass::compute_shared_init_state() { |
0 | 119 GUARDED_VM_ENTRY( |
120 instanceKlass* ik = get_instanceKlass(); | |
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121 _init_state = (instanceKlass::ClassState)ik->get_init_state(); |
0 | 122 ) |
123 } | |
124 | |
125 // ------------------------------------------------------------------ | |
126 // ciInstanceKlass::compute_shared_has_subklass | |
127 bool ciInstanceKlass::compute_shared_has_subklass() { | |
128 GUARDED_VM_ENTRY( | |
129 instanceKlass* ik = get_instanceKlass(); | |
130 _has_subklass = ik->subklass() != NULL; | |
131 return _has_subklass; | |
132 ) | |
133 } | |
134 | |
135 // ------------------------------------------------------------------ | |
136 // ciInstanceKlass::compute_shared_nof_implementors | |
137 int ciInstanceKlass::compute_shared_nof_implementors() { | |
138 // We requery this property, since it is a very old ciObject. | |
139 GUARDED_VM_ENTRY( | |
140 instanceKlass* ik = get_instanceKlass(); | |
141 _nof_implementors = ik->nof_implementors(); | |
142 return _nof_implementors; | |
143 ) | |
144 } | |
145 | |
146 // ------------------------------------------------------------------ | |
147 // ciInstanceKlass::loader | |
148 oop ciInstanceKlass::loader() { | |
149 ASSERT_IN_VM; | |
150 return JNIHandles::resolve(_loader); | |
151 } | |
152 | |
153 // ------------------------------------------------------------------ | |
154 // ciInstanceKlass::loader_handle | |
155 jobject ciInstanceKlass::loader_handle() { | |
156 return _loader; | |
157 } | |
158 | |
159 // ------------------------------------------------------------------ | |
160 // ciInstanceKlass::protection_domain | |
161 oop ciInstanceKlass::protection_domain() { | |
162 ASSERT_IN_VM; | |
163 return JNIHandles::resolve(_protection_domain); | |
164 } | |
165 | |
166 // ------------------------------------------------------------------ | |
167 // ciInstanceKlass::protection_domain_handle | |
168 jobject ciInstanceKlass::protection_domain_handle() { | |
169 return _protection_domain; | |
170 } | |
171 | |
172 // ------------------------------------------------------------------ | |
173 // ciInstanceKlass::field_cache | |
174 // | |
175 // Get the field cache associated with this klass. | |
176 ciConstantPoolCache* ciInstanceKlass::field_cache() { | |
177 if (is_shared()) { | |
178 return NULL; | |
179 } | |
180 if (_field_cache == NULL) { | |
181 assert(!is_java_lang_Object(), "Object has no fields"); | |
182 Arena* arena = CURRENT_ENV->arena(); | |
183 _field_cache = new (arena) ciConstantPoolCache(arena, 5); | |
184 } | |
185 return _field_cache; | |
186 } | |
187 | |
188 // ------------------------------------------------------------------ | |
189 // ciInstanceKlass::get_canonical_holder | |
190 // | |
191 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) { | |
192 #ifdef ASSERT | |
193 if (!(offset >= 0 && offset < layout_helper())) { | |
194 tty->print("*** get_canonical_holder(%d) on ", offset); | |
195 this->print(); | |
196 tty->print_cr(" ***"); | |
197 }; | |
198 assert(offset >= 0 && offset < layout_helper(), "offset must be tame"); | |
199 #endif | |
200 | |
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201 if (offset < instanceOopDesc::base_offset_in_bytes()) { |
0 | 202 // All header offsets belong properly to java/lang/Object. |
203 return CURRENT_ENV->Object_klass(); | |
204 } | |
205 | |
206 ciInstanceKlass* self = this; | |
207 for (;;) { | |
208 assert(self->is_loaded(), "must be loaded to have size"); | |
209 ciInstanceKlass* super = self->super(); | |
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210 if (super == NULL || super->nof_nonstatic_fields() == 0 || |
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211 !super->contains_field_offset(offset)) { |
0 | 212 return self; |
213 } else { | |
214 self = super; // return super->get_canonical_holder(offset) | |
215 } | |
216 } | |
217 } | |
218 | |
219 // ------------------------------------------------------------------ | |
220 // ciInstanceKlass::is_java_lang_Object | |
221 // | |
222 // Is this klass java.lang.Object? | |
223 bool ciInstanceKlass::is_java_lang_Object() { | |
224 return equals(CURRENT_ENV->Object_klass()); | |
225 } | |
226 | |
227 // ------------------------------------------------------------------ | |
228 // ciInstanceKlass::uses_default_loader | |
229 bool ciInstanceKlass::uses_default_loader() { | |
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230 // Note: We do not need to resolve the handle or enter the VM |
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231 // in order to test null-ness. |
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232 return _loader == NULL; |
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233 } |
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234 |
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235 // ------------------------------------------------------------------ |
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236 // ciInstanceKlass::is_in_package |
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237 // |
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238 // Is this klass in the given package? |
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239 bool ciInstanceKlass::is_in_package(const char* packagename, int len) { |
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240 // To avoid class loader mischief, this test always rejects application classes. |
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241 if (!uses_default_loader()) |
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242 return false; |
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243 GUARDED_VM_ENTRY( |
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244 return is_in_package_impl(packagename, len); |
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245 ) |
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246 } |
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247 |
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248 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) { |
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249 ASSERT_IN_VM; |
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250 |
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251 // If packagename contains trailing '/' exclude it from the |
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252 // prefix-test since we test for it explicitly. |
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253 if (packagename[len - 1] == '/') |
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254 len--; |
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255 |
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256 if (!name()->starts_with(packagename, len)) |
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257 return false; |
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258 |
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259 // Test if the class name is something like "java/lang". |
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260 if ((len + 1) > name()->utf8_length()) |
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261 return false; |
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262 |
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263 // Test for trailing '/' |
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264 if ((char) name()->byte_at(len) != '/') |
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265 return false; |
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266 |
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267 // Make sure it's not actually in a subpackage: |
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268 if (name()->index_of_at(len+1, "/", 1) >= 0) |
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269 return false; |
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270 |
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271 return true; |
0 | 272 } |
273 | |
274 // ------------------------------------------------------------------ | |
275 // ciInstanceKlass::print_impl | |
276 // | |
277 // Implementation of the print method. | |
278 void ciInstanceKlass::print_impl(outputStream* st) { | |
279 ciKlass::print_impl(st); | |
280 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());) | |
281 if (is_loaded()) { | |
282 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=", | |
283 bool_to_str(is_initialized()), | |
284 bool_to_str(has_finalizer()), | |
285 bool_to_str(has_subklass()), | |
286 layout_helper()); | |
287 | |
288 _flags.print_klass_flags(); | |
289 | |
290 if (_super) { | |
291 st->print(" super="); | |
292 _super->print_name(); | |
293 } | |
294 if (_java_mirror) { | |
295 st->print(" mirror=PRESENT"); | |
296 } | |
297 } else { | |
298 st->print(" loaded=false"); | |
299 } | |
300 } | |
301 | |
302 // ------------------------------------------------------------------ | |
303 // ciInstanceKlass::super | |
304 // | |
305 // Get the superklass of this klass. | |
306 ciInstanceKlass* ciInstanceKlass::super() { | |
307 assert(is_loaded(), "must be loaded"); | |
308 if (_super == NULL && !is_java_lang_Object()) { | |
309 GUARDED_VM_ENTRY( | |
310 klassOop super_klass = get_instanceKlass()->super(); | |
311 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass(); | |
312 ) | |
313 } | |
314 return _super; | |
315 } | |
316 | |
317 // ------------------------------------------------------------------ | |
318 // ciInstanceKlass::java_mirror | |
319 // | |
320 // Get the instance of java.lang.Class corresponding to this klass. | |
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321 // Cache it on this->_java_mirror. |
0 | 322 ciInstance* ciInstanceKlass::java_mirror() { |
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323 if (is_shared()) { |
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324 return ciKlass::java_mirror(); |
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325 } |
0 | 326 if (_java_mirror == NULL) { |
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327 _java_mirror = ciKlass::java_mirror(); |
0 | 328 } |
329 return _java_mirror; | |
330 } | |
331 | |
332 // ------------------------------------------------------------------ | |
333 // ciInstanceKlass::unique_concrete_subklass | |
334 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() { | |
335 if (!is_loaded()) return NULL; // No change if class is not loaded | |
336 if (!is_abstract()) return NULL; // Only applies to abstract classes. | |
337 if (!has_subklass()) return NULL; // Must have at least one subklass. | |
338 VM_ENTRY_MARK; | |
339 instanceKlass* ik = get_instanceKlass(); | |
340 Klass* up = ik->up_cast_abstract(); | |
341 assert(up->oop_is_instance(), "must be instanceKlass"); | |
342 if (ik == up) { | |
343 return NULL; | |
344 } | |
345 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass(); | |
346 } | |
347 | |
348 // ------------------------------------------------------------------ | |
349 // ciInstanceKlass::has_finalizable_subclass | |
350 bool ciInstanceKlass::has_finalizable_subclass() { | |
351 if (!is_loaded()) return true; | |
352 VM_ENTRY_MARK; | |
353 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL; | |
354 } | |
355 | |
356 // ------------------------------------------------------------------ | |
357 // ciInstanceKlass::get_field_by_offset | |
358 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) { | |
359 if (!is_static) { | |
360 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) { | |
361 ciField* field = _nonstatic_fields->at(i); | |
362 int field_off = field->offset_in_bytes(); | |
363 if (field_off == field_offset) | |
364 return field; | |
365 if (field_off > field_offset) | |
366 break; | |
367 // could do binary search or check bins, but probably not worth it | |
368 } | |
369 return NULL; | |
370 } | |
371 VM_ENTRY_MARK; | |
372 instanceKlass* k = get_instanceKlass(); | |
373 fieldDescriptor fd; | |
374 if (!k->find_field_from_offset(field_offset, is_static, &fd)) { | |
375 return NULL; | |
376 } | |
377 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); | |
378 return field; | |
379 } | |
380 | |
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381 // ------------------------------------------------------------------ |
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382 // ciInstanceKlass::get_field_by_name |
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383 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) { |
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384 VM_ENTRY_MARK; |
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385 instanceKlass* k = get_instanceKlass(); |
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386 fieldDescriptor fd; |
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387 klassOop def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd); |
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388 if (def == NULL) { |
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389 return NULL; |
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390 } |
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391 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); |
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392 return field; |
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393 } |
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394 |
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395 // ------------------------------------------------------------------ |
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396 // ciInstanceKlass::non_static_fields. |
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397 |
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398 class NonStaticFieldFiller: public FieldClosure { |
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399 GrowableArray<ciField*>* _arr; |
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400 ciEnv* _curEnv; |
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401 public: |
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402 NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) : |
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403 _curEnv(curEnv), _arr(arr) |
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404 {} |
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405 void do_field(fieldDescriptor* fd) { |
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406 ciField* field = new (_curEnv->arena()) ciField(fd); |
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407 _arr->append(field); |
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408 } |
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409 }; |
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410 |
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411 GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() { |
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412 if (_non_static_fields == NULL) { |
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413 VM_ENTRY_MARK; |
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414 ciEnv* curEnv = ciEnv::current(); |
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415 instanceKlass* ik = get_instanceKlass(); |
3938 | 416 int max_n_fields = ik->java_fields_count(); |
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417 |
1685 | 418 Arena* arena = curEnv->arena(); |
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419 _non_static_fields = |
1685 | 420 new (arena) GrowableArray<ciField*>(arena, max_n_fields, 0, NULL); |
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421 NonStaticFieldFiller filler(curEnv, _non_static_fields); |
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422 ik->do_nonstatic_fields(&filler); |
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423 } |
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424 return _non_static_fields; |
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425 } |
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426 |
0 | 427 static int sort_field_by_offset(ciField** a, ciField** b) { |
428 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes(); | |
429 // (no worries about 32-bit overflow...) | |
430 } | |
431 | |
432 // ------------------------------------------------------------------ | |
433 // ciInstanceKlass::compute_nonstatic_fields | |
434 int ciInstanceKlass::compute_nonstatic_fields() { | |
435 assert(is_loaded(), "must be loaded"); | |
436 | |
437 if (_nonstatic_fields != NULL) | |
438 return _nonstatic_fields->length(); | |
439 | |
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440 if (!has_nonstatic_fields()) { |
0 | 441 Arena* arena = CURRENT_ENV->arena(); |
442 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL); | |
443 return 0; | |
444 } | |
445 assert(!is_java_lang_Object(), "bootstrap OK"); | |
446 | |
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447 // Size in bytes of my fields, including inherited fields. |
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448 int fsize = nonstatic_field_size() * heapOopSize; |
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449 |
0 | 450 ciInstanceKlass* super = this->super(); |
451 GrowableArray<ciField*>* super_fields = NULL; | |
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452 if (super != NULL && super->has_nonstatic_fields()) { |
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453 int super_fsize = super->nonstatic_field_size() * heapOopSize; |
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454 int super_flen = super->nof_nonstatic_fields(); |
0 | 455 super_fields = super->_nonstatic_fields; |
456 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields"); | |
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457 // See if I am no larger than my super; if so, I can use his fields. |
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458 if (fsize == super_fsize) { |
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459 _nonstatic_fields = super_fields; |
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460 return super_fields->length(); |
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461 } |
0 | 462 } |
463 | |
464 GrowableArray<ciField*>* fields = NULL; | |
465 GUARDED_VM_ENTRY({ | |
466 fields = compute_nonstatic_fields_impl(super_fields); | |
467 }); | |
468 | |
469 if (fields == NULL) { | |
470 // This can happen if this class (java.lang.Class) has invisible fields. | |
471 _nonstatic_fields = super_fields; | |
472 return super_fields->length(); | |
473 } | |
474 | |
475 int flen = fields->length(); | |
476 | |
477 // Now sort them by offset, ascending. | |
478 // (In principle, they could mix with superclass fields.) | |
479 fields->sort(sort_field_by_offset); | |
480 _nonstatic_fields = fields; | |
481 return flen; | |
482 } | |
483 | |
484 GrowableArray<ciField*>* | |
485 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* | |
486 super_fields) { | |
487 ASSERT_IN_VM; | |
488 Arena* arena = CURRENT_ENV->arena(); | |
489 int flen = 0; | |
490 GrowableArray<ciField*>* fields = NULL; | |
491 instanceKlass* k = get_instanceKlass(); | |
3938 | 492 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { |
493 if (fs.access_flags().is_static()) continue; | |
494 flen += 1; | |
495 } | |
0 | 496 |
3938 | 497 // allocate the array: |
498 if (flen == 0) { | |
499 return NULL; // return nothing if none are locally declared | |
500 } | |
501 if (super_fields != NULL) { | |
502 flen += super_fields->length(); | |
503 } | |
504 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL); | |
505 if (super_fields != NULL) { | |
506 fields->appendAll(super_fields); | |
507 } | |
508 | |
509 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { | |
510 if (fs.access_flags().is_static()) continue; | |
511 fieldDescriptor fd; | |
512 fd.initialize(k->as_klassOop(), fs.index()); | |
513 ciField* field = new (arena) ciField(&fd); | |
514 fields->append(field); | |
0 | 515 } |
516 assert(fields->length() == flen, "sanity"); | |
517 return fields; | |
518 } | |
519 | |
520 // ------------------------------------------------------------------ | |
521 // ciInstanceKlass::find_method | |
522 // | |
523 // Find a method in this klass. | |
524 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) { | |
525 VM_ENTRY_MARK; | |
526 instanceKlass* k = get_instanceKlass(); | |
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527 Symbol* name_sym = name->get_symbol(); |
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528 Symbol* sig_sym= signature->get_symbol(); |
0 | 529 |
530 methodOop m = k->find_method(name_sym, sig_sym); | |
531 if (m == NULL) return NULL; | |
532 | |
533 return CURRENT_THREAD_ENV->get_object(m)->as_method(); | |
534 } | |
535 | |
536 // ------------------------------------------------------------------ | |
537 // ciInstanceKlass::is_leaf_type | |
538 bool ciInstanceKlass::is_leaf_type() { | |
539 assert(is_loaded(), "must be loaded"); | |
540 if (is_shared()) { | |
541 return is_final(); // approximately correct | |
542 } else { | |
543 return !_has_subklass && (_nof_implementors == 0); | |
544 } | |
545 } | |
546 | |
547 // ------------------------------------------------------------------ | |
548 // ciInstanceKlass::implementor | |
549 // | |
550 // Report an implementor of this interface. | |
551 // Returns NULL if exact information is not available. | |
552 // Note that there are various races here, since my copy | |
553 // of _nof_implementors might be out of date with respect | |
554 // to results returned by instanceKlass::implementor. | |
555 // This is OK, since any dependencies we decide to assert | |
556 // will be checked later under the Compile_lock. | |
557 ciInstanceKlass* ciInstanceKlass::implementor(int n) { | |
1924 | 558 if (n >= implementors_limit) { |
0 | 559 return NULL; |
560 } | |
561 ciInstanceKlass* impl = _implementors[n]; | |
562 if (impl == NULL) { | |
563 if (_nof_implementors > implementors_limit) { | |
564 return NULL; | |
565 } | |
566 // Go into the VM to fetch the implementor. | |
567 { | |
568 VM_ENTRY_MARK; | |
569 klassOop k = get_instanceKlass()->implementor(n); | |
570 if (k != NULL) { | |
571 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass(); | |
572 } | |
573 } | |
574 // Memoize this result. | |
575 if (!is_shared()) { | |
576 _implementors[n] = (impl == NULL)? this: impl; | |
577 } | |
578 } else if (impl == this) { | |
579 impl = NULL; // memoized null result from a VM query | |
580 } | |
581 return impl; | |
582 } |