Mercurial > hg > truffle
annotate src/share/vm/ci/ciObjectFactory.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | 1d7922586cf6 |
children | f6b0eb4e44cf d8ce2825b193 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, 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/ciCallSite.hpp" | |
27 #include "ci/ciInstance.hpp" | |
28 #include "ci/ciInstanceKlass.hpp" | |
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29 #include "ci/ciMemberName.hpp" |
1972 | 30 #include "ci/ciMethod.hpp" |
31 #include "ci/ciMethodData.hpp" | |
32 #include "ci/ciMethodHandle.hpp" | |
33 #include "ci/ciNullObject.hpp" | |
34 #include "ci/ciObjArray.hpp" | |
35 #include "ci/ciObjArrayKlass.hpp" | |
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36 #include "ci/ciObject.hpp" |
1972 | 37 #include "ci/ciObjectFactory.hpp" |
38 #include "ci/ciSymbol.hpp" | |
39 #include "ci/ciTypeArray.hpp" | |
40 #include "ci/ciTypeArrayKlass.hpp" | |
41 #include "ci/ciUtilities.hpp" | |
42 #include "classfile/systemDictionary.hpp" | |
43 #include "gc_interface/collectedHeap.inline.hpp" | |
44 #include "memory/allocation.inline.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "oops/oop.inline2.hpp" | |
47 #include "runtime/fieldType.hpp" | |
0 | 48 |
49 // ciObjectFactory | |
50 // | |
51 // This class handles requests for the creation of new instances | |
52 // of ciObject and its subclasses. It contains a caching mechanism | |
53 // which ensures that for each oop, at most one ciObject is created. | |
54 // This invariant allows more efficient implementation of ciObject. | |
55 // | |
56 // Implementation note: the oop->ciObject mapping is represented as | |
57 // a table stored in an array. Even though objects are moved | |
58 // by the garbage collector, the compactor preserves their relative | |
59 // order; address comparison of oops (in perm space) is safe so long | |
60 // as we prohibit GC during our comparisons. We currently use binary | |
61 // search to find the oop in the table, and inserting a new oop | |
62 // into the table may be costly. If this cost ends up being | |
63 // problematic the underlying data structure can be switched to some | |
64 // sort of balanced binary tree. | |
65 | |
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66 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL; |
0 | 67 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT]; |
68 int ciObjectFactory::_shared_ident_limit = 0; | |
69 volatile bool ciObjectFactory::_initialized = false; | |
70 | |
71 | |
72 // ------------------------------------------------------------------ | |
73 // ciObjectFactory::ciObjectFactory | |
74 ciObjectFactory::ciObjectFactory(Arena* arena, | |
75 int expected_size) { | |
76 | |
77 for (int i = 0; i < NON_PERM_BUCKETS; i++) { | |
78 _non_perm_bucket[i] = NULL; | |
79 } | |
80 _non_perm_count = 0; | |
81 | |
82 _next_ident = _shared_ident_limit; | |
83 _arena = arena; | |
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84 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL); |
0 | 85 |
86 // If the shared ci objects exist append them to this factory's objects | |
87 | |
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88 if (_shared_ci_metadata != NULL) { |
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89 _ci_metadata->appendAll(_shared_ci_metadata); |
0 | 90 } |
91 | |
92 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL); | |
93 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL); | |
1602 | 94 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL); |
0 | 95 _return_addresses = |
96 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL); | |
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97 |
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98 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL); |
0 | 99 } |
100 | |
101 // ------------------------------------------------------------------ | |
102 // ciObjectFactory::ciObjectFactory | |
103 void ciObjectFactory::initialize() { | |
104 ASSERT_IN_VM; | |
105 JavaThread* thread = JavaThread::current(); | |
106 HandleMark handle_mark(thread); | |
107 | |
108 // This Arena is long lived and exists in the resource mark of the | |
109 // compiler thread that initializes the initial ciObjectFactory which | |
110 // creates the shared ciObjects that all later ciObjectFactories use. | |
6197 | 111 Arena* arena = new (mtCompiler) Arena(); |
0 | 112 ciEnv initial(arena); |
113 ciEnv* env = ciEnv::current(); | |
114 env->_factory->init_shared_objects(); | |
115 | |
116 _initialized = true; | |
117 | |
118 } | |
119 | |
120 void ciObjectFactory::init_shared_objects() { | |
121 | |
122 _next_ident = 1; // start numbering CI objects at 1 | |
123 | |
124 { | |
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125 // Create the shared symbols, but not in _shared_ci_metadata. |
0 | 126 int i; |
127 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) { | |
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128 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i); |
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129 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping"); |
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130 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i); |
0 | 131 init_ident_of(sym); |
132 _shared_ci_symbols[i] = sym; | |
133 } | |
134 #ifdef ASSERT | |
135 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) { | |
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136 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i); |
0 | 137 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i); |
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138 assert(sym->get_symbol() == vmsym, "oop must match"); |
0 | 139 } |
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140 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check"); |
0 | 141 #endif |
142 } | |
143 | |
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144 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL); |
0 | 145 |
146 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) { | |
147 BasicType t = (BasicType)i; | |
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148 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP) { |
0 | 149 ciType::_basic_types[t] = new (_arena) ciType(t); |
150 init_ident_of(ciType::_basic_types[t]); | |
151 } | |
152 } | |
153 | |
154 ciEnv::_null_object_instance = new (_arena) ciNullObject(); | |
155 init_ident_of(ciEnv::_null_object_instance); | |
1142 | 156 |
157 #define WK_KLASS_DEFN(name, ignore_s, opt) \ | |
158 if (SystemDictionary::name() != NULL) \ | |
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159 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass(); |
1142 | 160 |
161 WK_KLASSES_DO(WK_KLASS_DEFN) | |
162 #undef WK_KLASS_DEFN | |
0 | 163 |
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164 for (int len = -1; len != _ci_metadata->length(); ) { |
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165 len = _ci_metadata->length(); |
0 | 166 for (int i2 = 0; i2 < len; i2++) { |
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167 ciMetadata* obj = _ci_metadata->at(i2); |
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168 assert (obj->is_metadata(), "what else would it be?"); |
0 | 169 if (obj->is_loaded() && obj->is_instance_klass()) { |
170 obj->as_instance_klass()->compute_nonstatic_fields(); | |
171 } | |
172 } | |
173 } | |
174 | |
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175 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol()); |
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176 // Create dummy InstanceKlass and objArrayKlass object and assign them idents |
0 | 177 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL); |
178 init_ident_of(ciEnv::_unloaded_ciinstance_klass); | |
179 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1); | |
180 init_ident_of(ciEnv::_unloaded_ciobjarrayklass); | |
181 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking"); | |
182 | |
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183 get_metadata(Universe::boolArrayKlassObj()); |
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184 get_metadata(Universe::charArrayKlassObj()); |
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185 get_metadata(Universe::singleArrayKlassObj()); |
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186 get_metadata(Universe::doubleArrayKlassObj()); |
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187 get_metadata(Universe::byteArrayKlassObj()); |
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188 get_metadata(Universe::shortArrayKlassObj()); |
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189 get_metadata(Universe::intArrayKlassObj()); |
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190 get_metadata(Universe::longArrayKlassObj()); |
0 | 191 |
192 | |
193 | |
194 assert(_non_perm_count == 0, "no shared non-perm objects"); | |
195 | |
196 // The shared_ident_limit is the first ident number that will | |
197 // be used for non-shared objects. That is, numbers less than | |
198 // this limit are permanently assigned to shared CI objects, | |
199 // while the higher numbers are recycled afresh by each new ciEnv. | |
200 | |
201 _shared_ident_limit = _next_ident; | |
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202 _shared_ci_metadata = _ci_metadata; |
0 | 203 } |
204 | |
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205 |
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206 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) { |
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207 vmSymbols::SID sid = vmSymbols::find_sid(key); |
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208 if (sid != vmSymbols::NO_SID) { |
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209 // do not pollute the main cache with it |
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210 return vm_symbol_at(sid); |
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211 } |
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212 |
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213 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, ""); |
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214 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID); |
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215 _symbols->push(s); |
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216 return s; |
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217 } |
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218 |
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219 // Decrement the refcount when done on symbols referenced by this compilation. |
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220 void ciObjectFactory::remove_symbols() { |
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221 for (int i = 0; i < _symbols->length(); i++) { |
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222 ciSymbol* s = _symbols->at(i); |
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223 s->get_symbol()->decrement_refcount(); |
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224 } |
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225 // Since _symbols is resource allocated we're not allowed to delete it |
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226 // but it'll go away just the same. |
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227 } |
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228 |
0 | 229 // ------------------------------------------------------------------ |
230 // ciObjectFactory::get | |
231 // | |
232 // Get the ciObject corresponding to some oop. If the ciObject has | |
233 // already been created, it is returned. Otherwise, a new ciObject | |
234 // is created. | |
235 ciObject* ciObjectFactory::get(oop key) { | |
236 ASSERT_IN_VM; | |
237 | |
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238 assert(key == NULL || Universe::heap()->is_in_reserved(key), "must be"); |
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239 |
0 | 240 NonPermObject* &bucket = find_non_perm(key); |
241 if (bucket != NULL) { | |
242 return bucket->object(); | |
243 } | |
244 | |
245 // The ciObject does not yet exist. Create it and insert it | |
246 // into the cache. | |
247 Handle keyHandle(key); | |
248 ciObject* new_object = create_new_object(keyHandle()); | |
249 assert(keyHandle() == new_object->get_oop(), "must be properly recorded"); | |
250 init_ident_of(new_object); | |
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251 assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be"); |
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252 |
0 | 253 // Not a perm-space object. |
254 insert_non_perm(bucket, keyHandle(), new_object); | |
255 return new_object; | |
256 } | |
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257 |
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258 // ------------------------------------------------------------------ |
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259 // ciObjectFactory::get |
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260 // |
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261 // Get the ciObject corresponding to some oop. If the ciObject has |
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262 // already been created, it is returned. Otherwise, a new ciObject |
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263 // is created. |
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264 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) { |
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265 ASSERT_IN_VM; |
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266 |
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267 assert(key == NULL || key->is_metadata(), "must be"); |
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268 |
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269 #ifdef ASSERT |
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270 if (CIObjectFactoryVerify) { |
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271 Metadata* last = NULL; |
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272 for (int j = 0; j< _ci_metadata->length(); j++) { |
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273 Metadata* o = _ci_metadata->at(j)->constant_encoding(); |
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274 assert(last < o, "out of order"); |
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275 last = o; |
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276 } |
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277 } |
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278 #endif // ASSERT |
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279 int len = _ci_metadata->length(); |
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280 int index = find(key, _ci_metadata); |
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281 #ifdef ASSERT |
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282 if (CIObjectFactoryVerify) { |
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283 for (int i=0; i<_ci_metadata->length(); i++) { |
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284 if (_ci_metadata->at(i)->constant_encoding() == key) { |
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285 assert(index == i, " bad lookup"); |
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286 } |
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287 } |
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288 } |
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289 #endif |
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290 if (!is_found_at(index, key, _ci_metadata)) { |
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291 // The ciObject does not yet exist. Create it and insert it |
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292 // into the cache. |
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293 ciMetadata* new_object = create_new_object(key); |
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294 init_ident_of(new_object); |
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295 assert(new_object->is_metadata(), "must be"); |
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296 |
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297 if (len != _ci_metadata->length()) { |
0 | 298 // creating the new object has recursively entered new objects |
299 // into the table. We need to recompute our index. | |
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300 index = find(key, _ci_metadata); |
0 | 301 } |
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302 assert(!is_found_at(index, key, _ci_metadata), "no double insert"); |
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303 insert(index, new_object, _ci_metadata); |
0 | 304 return new_object; |
305 } | |
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306 return _ci_metadata->at(index)->as_metadata(); |
0 | 307 } |
308 | |
309 // ------------------------------------------------------------------ | |
310 // ciObjectFactory::create_new_object | |
311 // | |
312 // Create a new ciObject from an oop. | |
313 // | |
314 // Implementation note: this functionality could be virtual behavior | |
315 // of the oop itself. For now, we explicitly marshal the object. | |
316 ciObject* ciObjectFactory::create_new_object(oop o) { | |
317 EXCEPTION_CONTEXT; | |
318 | |
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319 if (o->is_instance()) { |
0 | 320 instanceHandle h_i(THREAD, (instanceOop)o); |
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321 if (java_lang_invoke_CallSite::is_instance(o)) |
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322 return new (arena()) ciCallSite(h_i); |
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323 else if (java_lang_invoke_MemberName::is_instance(o)) |
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324 return new (arena()) ciMemberName(h_i); |
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325 else if (java_lang_invoke_MethodHandle::is_instance(o)) |
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326 return new (arena()) ciMethodHandle(h_i); |
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327 else |
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328 return new (arena()) ciInstance(h_i); |
0 | 329 } else if (o->is_objArray()) { |
330 objArrayHandle h_oa(THREAD, (objArrayOop)o); | |
331 return new (arena()) ciObjArray(h_oa); | |
332 } else if (o->is_typeArray()) { | |
333 typeArrayHandle h_ta(THREAD, (typeArrayOop)o); | |
334 return new (arena()) ciTypeArray(h_ta); | |
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335 } |
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336 |
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337 // The oop is of some type not supported by the compiler interface. |
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338 ShouldNotReachHere(); |
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339 return NULL; |
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340 } |
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341 |
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342 // ------------------------------------------------------------------ |
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343 // ciObjectFactory::create_new_object |
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344 // |
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345 // Create a new ciObject from a Metadata*. |
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346 // |
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347 // Implementation note: this functionality could be virtual behavior |
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348 // of the oop itself. For now, we explicitly marshal the object. |
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349 ciMetadata* ciObjectFactory::create_new_object(Metadata* o) { |
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350 EXCEPTION_CONTEXT; |
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351 |
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352 if (o->is_klass()) { |
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353 KlassHandle h_k(THREAD, (Klass*)o); |
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354 Klass* k = (Klass*)o; |
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355 if (k->oop_is_instance()) { |
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356 return new (arena()) ciInstanceKlass(h_k); |
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357 } else if (k->oop_is_objArray()) { |
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358 return new (arena()) ciObjArrayKlass(h_k); |
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359 } else if (k->oop_is_typeArray()) { |
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360 return new (arena()) ciTypeArrayKlass(h_k); |
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361 } |
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362 } else if (o->is_method()) { |
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363 methodHandle h_m(THREAD, (Method*)o); |
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364 return new (arena()) ciMethod(h_m); |
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365 } else if (o->is_methodData()) { |
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366 // Hold methodHandle alive - might not be necessary ??? |
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367 methodHandle h_m(THREAD, ((MethodData*)o)->method()); |
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368 return new (arena()) ciMethodData((MethodData*)o); |
0 | 369 } |
370 | |
371 // The oop is of some type not supported by the compiler interface. | |
372 ShouldNotReachHere(); | |
373 return NULL; | |
374 } | |
375 | |
376 //------------------------------------------------------------------ | |
377 // ciObjectFactory::get_unloaded_method | |
378 // | |
379 // Get the ciMethod representing an unloaded/unfound method. | |
380 // | |
381 // Implementation note: unloaded methods are currently stored in | |
382 // an unordered array, requiring a linear-time lookup for each | |
383 // unloaded method. This may need to change. | |
384 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder, | |
385 ciSymbol* name, | |
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386 ciSymbol* signature, |
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387 ciInstanceKlass* accessor) { |
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388 ciSignature* that = NULL; |
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389 for (int i = 0; i < _unloaded_methods->length(); i++) { |
0 | 390 ciMethod* entry = _unloaded_methods->at(i); |
391 if (entry->holder()->equals(holder) && | |
392 entry->name()->equals(name) && | |
393 entry->signature()->as_symbol()->equals(signature)) { | |
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394 // Short-circuit slow resolve. |
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395 if (entry->signature()->accessing_klass() == accessor) { |
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396 // We've found a match. |
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397 return entry; |
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398 } else { |
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399 // Lazily create ciSignature |
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400 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature); |
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401 if (entry->signature()->equals(that)) { |
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402 // We've found a match. |
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403 return entry; |
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404 } |
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405 } |
0 | 406 } |
407 } | |
408 | |
409 // This is a new unloaded method. Create it and stick it in | |
410 // the cache. | |
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411 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor); |
0 | 412 |
413 init_ident_of(new_method); | |
414 _unloaded_methods->append(new_method); | |
415 | |
416 return new_method; | |
417 } | |
418 | |
419 //------------------------------------------------------------------ | |
420 // ciObjectFactory::get_unloaded_klass | |
421 // | |
422 // Get a ciKlass representing an unloaded klass. | |
423 // | |
424 // Implementation note: unloaded klasses are currently stored in | |
425 // an unordered array, requiring a linear-time lookup for each | |
426 // unloaded klass. This may need to change. | |
427 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass, | |
428 ciSymbol* name, | |
429 bool create_if_not_found) { | |
430 EXCEPTION_CONTEXT; | |
431 oop loader = NULL; | |
432 oop domain = NULL; | |
433 if (accessing_klass != NULL) { | |
434 loader = accessing_klass->loader(); | |
435 domain = accessing_klass->protection_domain(); | |
436 } | |
437 for (int i=0; i<_unloaded_klasses->length(); i++) { | |
438 ciKlass* entry = _unloaded_klasses->at(i); | |
439 if (entry->name()->equals(name) && | |
440 entry->loader() == loader && | |
441 entry->protection_domain() == domain) { | |
442 // We've found a match. | |
443 return entry; | |
444 } | |
445 } | |
446 | |
447 if (!create_if_not_found) | |
448 return NULL; | |
449 | |
450 // This is a new unloaded klass. Create it and stick it in | |
451 // the cache. | |
452 ciKlass* new_klass = NULL; | |
453 | |
454 // Two cases: this is an unloaded objArrayKlass or an | |
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455 // unloaded InstanceKlass. Deal with both. |
0 | 456 if (name->byte_at(0) == '[') { |
457 // Decompose the name.' | |
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458 FieldArrayInfo fd; |
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459 BasicType element_type = FieldType::get_array_info(name->get_symbol(), |
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460 fd, THREAD); |
0 | 461 if (HAS_PENDING_EXCEPTION) { |
462 CLEAR_PENDING_EXCEPTION; | |
463 CURRENT_THREAD_ENV->record_out_of_memory_failure(); | |
464 return ciEnv::_unloaded_ciobjarrayklass; | |
465 } | |
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466 int dimension = fd.dimension(); |
0 | 467 assert(element_type != T_ARRAY, "unsuccessful decomposition"); |
468 ciKlass* element_klass = NULL; | |
469 if (element_type == T_OBJECT) { | |
470 ciEnv *env = CURRENT_THREAD_ENV; | |
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471 ciSymbol* ci_name = env->get_symbol(fd.object_key()); |
0 | 472 element_klass = |
473 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass(); | |
474 } else { | |
475 assert(dimension > 1, "one dimensional type arrays are always loaded."); | |
476 | |
477 // The type array itself takes care of one of the dimensions. | |
478 dimension--; | |
479 | |
480 // The element klass is a typeArrayKlass. | |
481 element_klass = ciTypeArrayKlass::make(element_type); | |
482 } | |
483 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension); | |
484 } else { | |
485 jobject loader_handle = NULL; | |
486 jobject domain_handle = NULL; | |
487 if (accessing_klass != NULL) { | |
488 loader_handle = accessing_klass->loader_handle(); | |
489 domain_handle = accessing_klass->protection_domain_handle(); | |
490 } | |
491 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle); | |
492 } | |
493 init_ident_of(new_klass); | |
494 _unloaded_klasses->append(new_klass); | |
495 | |
496 return new_klass; | |
497 } | |
498 | |
1602 | 499 |
500 //------------------------------------------------------------------ | |
501 // ciObjectFactory::get_unloaded_instance | |
502 // | |
503 // Get a ciInstance representing an as-yet undetermined instance of a given class. | |
504 // | |
505 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) { | |
506 for (int i=0; i<_unloaded_instances->length(); i++) { | |
507 ciInstance* entry = _unloaded_instances->at(i); | |
508 if (entry->klass()->equals(instance_klass)) { | |
509 // We've found a match. | |
510 return entry; | |
511 } | |
512 } | |
513 | |
514 // This is a new unloaded instance. Create it and stick it in | |
515 // the cache. | |
516 ciInstance* new_instance = new (arena()) ciInstance(instance_klass); | |
517 | |
518 init_ident_of(new_instance); | |
519 _unloaded_instances->append(new_instance); | |
520 | |
521 // make sure it looks the way we want: | |
522 assert(!new_instance->is_loaded(), ""); | |
523 assert(new_instance->klass() == instance_klass, ""); | |
524 | |
525 return new_instance; | |
526 } | |
527 | |
528 | |
529 //------------------------------------------------------------------ | |
530 // ciObjectFactory::get_unloaded_klass_mirror | |
531 // | |
532 // Get a ciInstance representing an unresolved klass mirror. | |
533 // | |
534 // Currently, this ignores the parameters and returns a unique unloaded instance. | |
535 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) { | |
536 assert(ciEnv::_Class_klass != NULL, ""); | |
537 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass()); | |
538 } | |
539 | |
540 //------------------------------------------------------------------ | |
541 // ciObjectFactory::get_unloaded_method_handle_constant | |
542 // | |
543 // Get a ciInstance representing an unresolved method handle constant. | |
544 // | |
545 // Currently, this ignores the parameters and returns a unique unloaded instance. | |
546 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder, | |
547 ciSymbol* name, | |
548 ciSymbol* signature, | |
549 int ref_kind) { | |
550 if (ciEnv::_MethodHandle_klass == NULL) return NULL; | |
551 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass()); | |
552 } | |
553 | |
554 //------------------------------------------------------------------ | |
555 // ciObjectFactory::get_unloaded_method_type_constant | |
556 // | |
557 // Get a ciInstance representing an unresolved method type constant. | |
558 // | |
559 // Currently, this ignores the parameters and returns a unique unloaded instance. | |
560 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) { | |
561 if (ciEnv::_MethodType_klass == NULL) return NULL; | |
562 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass()); | |
563 } | |
564 | |
565 | |
566 | |
0 | 567 //------------------------------------------------------------------ |
568 // ciObjectFactory::get_empty_methodData | |
569 // | |
570 // Get the ciMethodData representing the methodData for a method with | |
571 // none. | |
572 ciMethodData* ciObjectFactory::get_empty_methodData() { | |
573 ciMethodData* new_methodData = new (arena()) ciMethodData(); | |
574 init_ident_of(new_methodData); | |
575 return new_methodData; | |
576 } | |
577 | |
578 //------------------------------------------------------------------ | |
579 // ciObjectFactory::get_return_address | |
580 // | |
581 // Get a ciReturnAddress for a specified bci. | |
582 ciReturnAddress* ciObjectFactory::get_return_address(int bci) { | |
583 for (int i=0; i<_return_addresses->length(); i++) { | |
584 ciReturnAddress* entry = _return_addresses->at(i); | |
585 if (entry->bci() == bci) { | |
586 // We've found a match. | |
587 return entry; | |
588 } | |
589 } | |
590 | |
591 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci); | |
592 init_ident_of(new_ret_addr); | |
593 _return_addresses->append(new_ret_addr); | |
594 return new_ret_addr; | |
595 } | |
596 | |
597 // ------------------------------------------------------------------ | |
598 // ciObjectFactory::init_ident_of | |
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599 void ciObjectFactory::init_ident_of(ciBaseObject* obj) { |
0 | 600 obj->set_ident(_next_ident++); |
601 } | |
602 | |
603 // ------------------------------------------------------------------ | |
604 // ciObjectFactory::find | |
605 // | |
606 // Use binary search to find the position of this oop in the cache. | |
607 // If there is no entry in the cache corresponding to this oop, return | |
608 // the position at which the oop should be inserted. | |
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609 int ciObjectFactory::find(Metadata* key, GrowableArray<ciMetadata*>* objects) { |
0 | 610 int min = 0; |
611 int max = objects->length()-1; | |
612 | |
613 // print_contents(); | |
614 | |
615 while (max >= min) { | |
616 int mid = (max + min) / 2; | |
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617 Metadata* value = objects->at(mid)->constant_encoding(); |
0 | 618 if (value < key) { |
619 min = mid + 1; | |
620 } else if (value > key) { | |
621 max = mid - 1; | |
622 } else { | |
623 return mid; | |
624 } | |
625 } | |
626 return min; | |
627 } | |
628 | |
629 // ------------------------------------------------------------------ | |
630 // ciObjectFactory::is_found_at | |
631 // | |
632 // Verify that the binary seach found the given key. | |
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633 bool ciObjectFactory::is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects) { |
0 | 634 return (index < objects->length() && |
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635 objects->at(index)->constant_encoding() == key); |
0 | 636 } |
637 | |
638 | |
639 // ------------------------------------------------------------------ | |
640 // ciObjectFactory::insert | |
641 // | |
642 // Insert a ciObject into the table at some index. | |
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643 void ciObjectFactory::insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects) { |
0 | 644 int len = objects->length(); |
645 if (len == index) { | |
646 objects->append(obj); | |
647 } else { | |
648 objects->append(objects->at(len-1)); | |
649 int pos; | |
650 for (pos = len-2; pos >= index; pos--) { | |
651 objects->at_put(pos+1,objects->at(pos)); | |
652 } | |
653 objects->at_put(index, obj); | |
654 } | |
655 } | |
656 | |
657 static ciObjectFactory::NonPermObject* emptyBucket = NULL; | |
658 | |
659 // ------------------------------------------------------------------ | |
660 // ciObjectFactory::find_non_perm | |
661 // | |
662 // Use a small hash table, hashed on the klass of the key. | |
663 // If there is no entry in the cache corresponding to this oop, return | |
664 // the null tail of the bucket into which the oop should be inserted. | |
665 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) { | |
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666 assert(Universe::heap()->is_in_reserved_or_null(key), "must be"); |
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667 ciMetadata* klass = get_metadata(key->klass()); |
0 | 668 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS]; |
669 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) { | |
670 if (is_equal(p, key)) break; | |
671 } | |
672 return (*bp); | |
673 } | |
674 | |
675 | |
676 | |
677 // ------------------------------------------------------------------ | |
678 // Code for for NonPermObject | |
679 // | |
680 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) { | |
681 assert(ciObjectFactory::is_initialized(), ""); | |
682 _object = object; | |
683 _next = bucket; | |
684 bucket = this; | |
685 } | |
686 | |
687 | |
688 | |
689 // ------------------------------------------------------------------ | |
690 // ciObjectFactory::insert_non_perm | |
691 // | |
692 // Insert a ciObject into the non-perm table. | |
693 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) { | |
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694 assert(Universe::heap()->is_in_reserved_or_null(key), "must be"); |
0 | 695 assert(&where != &emptyBucket, "must not try to fill empty bucket"); |
696 NonPermObject* p = new (arena()) NonPermObject(where, key, obj); | |
697 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match"); | |
698 assert(find_non_perm(key) == p, "must find the same spot"); | |
699 ++_non_perm_count; | |
700 } | |
701 | |
702 // ------------------------------------------------------------------ | |
703 // ciObjectFactory::vm_symbol_at | |
704 // Get the ciSymbol corresponding to some index in vmSymbols. | |
705 ciSymbol* ciObjectFactory::vm_symbol_at(int index) { | |
706 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob"); | |
707 return _shared_ci_symbols[index]; | |
708 } | |
709 | |
710 // ------------------------------------------------------------------ | |
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711 // ciObjectFactory::metadata_do |
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712 void ciObjectFactory::metadata_do(void f(Metadata*)) { |
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713 if (_ci_metadata == NULL) return; |
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714 for (int j = 0; j< _ci_metadata->length(); j++) { |
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715 Metadata* o = _ci_metadata->at(j)->constant_encoding(); |
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716 f(o); |
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717 } |
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718 } |
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719 |
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720 // ------------------------------------------------------------------ |
0 | 721 // ciObjectFactory::print_contents_impl |
722 void ciObjectFactory::print_contents_impl() { | |
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723 int len = _ci_metadata->length(); |
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724 tty->print_cr("ciObjectFactory (%d) meta data contents:", len); |
0 | 725 for (int i=0; i<len; i++) { |
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726 _ci_metadata->at(i)->print(); |
0 | 727 tty->cr(); |
728 } | |
729 } | |
730 | |
731 // ------------------------------------------------------------------ | |
732 // ciObjectFactory::print_contents | |
733 void ciObjectFactory::print_contents() { | |
734 print(); | |
735 tty->cr(); | |
736 GUARDED_VM_ENTRY(print_contents_impl();) | |
737 } | |
738 | |
739 // ------------------------------------------------------------------ | |
740 // ciObjectFactory::print | |
741 // | |
742 // Print debugging information about the object factory | |
743 void ciObjectFactory::print() { | |
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744 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>", |
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745 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(), |
1602 | 746 _unloaded_instances->length(), |
0 | 747 _unloaded_klasses->length()); |
748 } |