Mercurial > hg > truffle
annotate src/share/vm/oops/cpCacheOop.cpp @ 1662:e0ba4e04c839
6969574: invokedynamic call sites deoptimize instead of executing
Reviewed-by: kvn
| author | jrose |
|---|---|
| date | Fri, 16 Jul 2010 18:14:19 -0700 |
| parents | 083fde3b838e |
| children | 87d6a4d1ecbc |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1998, 2009, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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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 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_cpCacheOop.cpp.incl" | |
| 27 | |
| 28 | |
| 29 // Implememtation of ConstantPoolCacheEntry | |
| 30 | |
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31 void ConstantPoolCacheEntry::initialize_entry(int index) { |
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32 assert(0 < index && index < 0x10000, "sanity check"); |
| 0 | 33 _indices = index; |
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34 assert(constant_pool_index() == index, ""); |
| 0 | 35 } |
| 36 | |
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37 void ConstantPoolCacheEntry::initialize_secondary_entry(int main_index) { |
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38 assert(0 <= main_index && main_index < 0x10000, "sanity check"); |
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39 _indices = (main_index << 16); |
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40 assert(main_entry_index() == main_index, ""); |
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41 } |
| 0 | 42 |
| 43 int ConstantPoolCacheEntry::as_flags(TosState state, bool is_final, | |
| 44 bool is_vfinal, bool is_volatile, | |
| 45 bool is_method_interface, bool is_method) { | |
| 46 int f = state; | |
| 47 | |
| 48 assert( state < number_of_states, "Invalid state in as_flags"); | |
| 49 | |
| 50 f <<= 1; | |
| 51 if (is_final) f |= 1; | |
| 52 f <<= 1; | |
| 53 if (is_vfinal) f |= 1; | |
| 54 f <<= 1; | |
| 55 if (is_volatile) f |= 1; | |
| 56 f <<= 1; | |
| 57 if (is_method_interface) f |= 1; | |
| 58 f <<= 1; | |
| 59 if (is_method) f |= 1; | |
| 60 f <<= ConstantPoolCacheEntry::hotSwapBit; | |
| 61 // Preserve existing flag bit values | |
| 62 #ifdef ASSERT | |
| 63 int old_state = ((_flags >> tosBits) & 0x0F); | |
| 64 assert(old_state == 0 || old_state == state, | |
| 65 "inconsistent cpCache flags state"); | |
| 66 #endif | |
| 67 return (_flags | f) ; | |
| 68 } | |
| 69 | |
| 70 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { | |
| 71 #ifdef ASSERT | |
| 72 // Read once. | |
| 73 volatile Bytecodes::Code c = bytecode_1(); | |
| 74 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
| 75 #endif | |
| 76 // Need to flush pending stores here before bytecode is written. | |
| 77 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 16)); | |
| 78 } | |
| 79 | |
| 80 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
| 81 #ifdef ASSERT | |
| 82 // Read once. | |
| 83 volatile Bytecodes::Code c = bytecode_2(); | |
| 84 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
| 85 #endif | |
| 86 // Need to flush pending stores here before bytecode is written. | |
| 87 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 24)); | |
| 88 } | |
| 89 | |
| 90 #ifdef ASSERT | |
| 91 // It is possible to have two different dummy methodOops created | |
| 92 // when the resolve code for invoke interface executes concurrently | |
| 93 // Hence the assertion below is weakened a bit for the invokeinterface | |
| 94 // case. | |
| 95 bool ConstantPoolCacheEntry::same_methodOop(oop cur_f1, oop f1) { | |
| 96 return (cur_f1 == f1 || ((methodOop)cur_f1)->name() == | |
| 97 ((methodOop)f1)->name() || ((methodOop)cur_f1)->signature() == | |
| 98 ((methodOop)f1)->signature()); | |
| 99 } | |
| 100 #endif | |
| 101 | |
| 102 // Note that concurrent update of both bytecodes can leave one of them | |
| 103 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
| 104 // the damaged entry. More seriously, the memory synchronization is needed | |
| 105 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
| 106 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
| 107 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
| 108 Bytecodes::Code put_code, | |
| 109 KlassHandle field_holder, | |
| 110 int orig_field_index, | |
| 111 int field_offset, | |
| 112 TosState field_type, | |
| 113 bool is_final, | |
| 114 bool is_volatile) { | |
| 115 set_f1(field_holder()); | |
| 116 set_f2(field_offset); | |
| 117 // The field index is used by jvm/ti and is the index into fields() array | |
| 118 // in holder instanceKlass. This is scaled by instanceKlass::next_offset. | |
| 119 assert((orig_field_index % instanceKlass::next_offset) == 0, "wierd index"); | |
| 120 const int field_index = orig_field_index / instanceKlass::next_offset; | |
| 121 assert(field_index <= field_index_mask, | |
| 122 "field index does not fit in low flag bits"); | |
| 123 set_flags(as_flags(field_type, is_final, false, is_volatile, false, false) | | |
| 124 (field_index & field_index_mask)); | |
| 125 set_bytecode_1(get_code); | |
| 126 set_bytecode_2(put_code); | |
| 127 NOT_PRODUCT(verify(tty)); | |
| 128 } | |
| 129 | |
| 130 int ConstantPoolCacheEntry::field_index() const { | |
| 131 return (_flags & field_index_mask) * instanceKlass::next_offset; | |
| 132 } | |
| 133 | |
| 134 void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code, | |
| 135 methodHandle method, | |
| 136 int vtable_index) { | |
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137 assert(!is_secondary_entry(), ""); |
| 0 | 138 assert(method->interpreter_entry() != NULL, "should have been set at this point"); |
| 139 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
| 140 bool change_to_virtual = (invoke_code == Bytecodes::_invokeinterface); | |
| 141 | |
| 142 int byte_no = -1; | |
| 143 bool needs_vfinal_flag = false; | |
| 144 switch (invoke_code) { | |
| 145 case Bytecodes::_invokevirtual: | |
| 146 case Bytecodes::_invokeinterface: { | |
| 147 if (method->can_be_statically_bound()) { | |
| 148 set_f2((intptr_t)method()); | |
| 149 needs_vfinal_flag = true; | |
| 150 } else { | |
| 151 assert(vtable_index >= 0, "valid index"); | |
| 152 set_f2(vtable_index); | |
| 153 } | |
| 154 byte_no = 2; | |
| 155 break; | |
| 156 } | |
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157 |
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158 case Bytecodes::_invokedynamic: // similar to _invokevirtual |
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159 if (TraceInvokeDynamic) { |
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160 tty->print_cr("InvokeDynamic set_method%s method="PTR_FORMAT" index=%d", |
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161 (is_secondary_entry() ? " secondary" : ""), |
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162 (intptr_t)method(), vtable_index); |
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163 method->print(); |
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164 this->print(tty, 0); |
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165 } |
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166 assert(method->can_be_statically_bound(), "must be a MH invoker method"); |
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167 assert(AllowTransitionalJSR292 || _f2 >= constantPoolOopDesc::CPCACHE_INDEX_TAG, "BSM index initialized"); |
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168 set_f1(method()); |
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169 needs_vfinal_flag = false; // _f2 is not an oop |
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170 assert(!is_vfinal(), "f2 not an oop"); |
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171 byte_no = 1; // coordinate this with bytecode_number & is_resolved |
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172 break; |
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173 |
| 0 | 174 case Bytecodes::_invokespecial: |
| 175 // Preserve the value of the vfinal flag on invokevirtual bytecode | |
| 176 // which may be shared with this constant pool cache entry. | |
| 177 needs_vfinal_flag = is_resolved(Bytecodes::_invokevirtual) && is_vfinal(); | |
| 178 // fall through | |
| 179 case Bytecodes::_invokestatic: | |
| 180 set_f1(method()); | |
| 181 byte_no = 1; | |
| 182 break; | |
| 183 default: | |
| 184 ShouldNotReachHere(); | |
| 185 break; | |
| 186 } | |
| 187 | |
| 188 set_flags(as_flags(as_TosState(method->result_type()), | |
| 189 method->is_final_method(), | |
| 190 needs_vfinal_flag, | |
| 191 false, | |
| 192 change_to_virtual, | |
| 193 true)| | |
| 194 method()->size_of_parameters()); | |
| 195 | |
| 196 // Note: byte_no also appears in TemplateTable::resolve. | |
| 197 if (byte_no == 1) { | |
| 198 set_bytecode_1(invoke_code); | |
| 199 } else if (byte_no == 2) { | |
| 200 if (change_to_virtual) { | |
| 201 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! | |
| 202 // | |
| 203 // Workaround for the case where we encounter an invokeinterface, but we | |
| 204 // should really have an _invokevirtual since the resolved method is a | |
| 205 // virtual method in java.lang.Object. This is a corner case in the spec | |
| 206 // but is presumably legal. javac does not generate this code. | |
| 207 // | |
| 208 // We set bytecode_1() to _invokeinterface, because that is the | |
| 209 // bytecode # used by the interpreter to see if it is resolved. | |
| 210 // We set bytecode_2() to _invokevirtual. | |
| 211 // See also interpreterRuntime.cpp. (8/25/2000) | |
| 212 // Only set resolved for the invokeinterface case if method is public. | |
| 213 // Otherwise, the method needs to be reresolved with caller for each | |
| 214 // interface call. | |
| 215 if (method->is_public()) set_bytecode_1(invoke_code); | |
| 216 set_bytecode_2(Bytecodes::_invokevirtual); | |
| 217 } else { | |
| 218 set_bytecode_2(invoke_code); | |
| 219 } | |
| 220 } else { | |
| 221 ShouldNotReachHere(); | |
| 222 } | |
| 223 NOT_PRODUCT(verify(tty)); | |
| 224 } | |
| 225 | |
| 226 | |
| 227 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) { | |
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228 assert(!is_secondary_entry(), ""); |
| 0 | 229 klassOop interf = method->method_holder(); |
| 230 assert(instanceKlass::cast(interf)->is_interface(), "must be an interface"); | |
| 231 set_f1(interf); | |
| 232 set_f2(index); | |
| 233 set_flags(as_flags(as_TosState(method->result_type()), method->is_final_method(), false, false, false, true) | method()->size_of_parameters()); | |
| 234 set_bytecode_1(Bytecodes::_invokeinterface); | |
| 235 } | |
| 236 | |
| 237 | |
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238 void ConstantPoolCacheEntry::initialize_bootstrap_method_index_in_cache(int bsm_cache_index) { |
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239 assert(!is_secondary_entry(), "only for JVM_CONSTANT_InvokeDynamic main entry"); |
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240 assert(_f2 == 0, "initialize once"); |
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241 assert(bsm_cache_index == (int)(u2)bsm_cache_index, "oob"); |
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242 set_f2(bsm_cache_index + constantPoolOopDesc::CPCACHE_INDEX_TAG); |
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243 } |
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244 |
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245 int ConstantPoolCacheEntry::bootstrap_method_index_in_cache() { |
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246 assert(!is_secondary_entry(), "only for JVM_CONSTANT_InvokeDynamic main entry"); |
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247 intptr_t bsm_cache_index = (intptr_t) _f2 - constantPoolOopDesc::CPCACHE_INDEX_TAG; |
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248 assert(bsm_cache_index == (intptr_t)(u2)bsm_cache_index, "oob"); |
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249 return (int) bsm_cache_index; |
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250 } |
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251 |
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252 void ConstantPoolCacheEntry::set_dynamic_call(Handle call_site, |
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253 methodHandle signature_invoker) { |
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254 assert(is_secondary_entry(), ""); |
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255 int param_size = signature_invoker->size_of_parameters(); |
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256 assert(param_size >= 1, "method argument size must include MH.this"); |
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257 param_size -= 1; // do not count MH.this; it is not stacked for invokedynamic |
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258 if (Atomic::cmpxchg_ptr(call_site(), &_f1, NULL) == NULL) { |
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259 // racing threads might be trying to install their own favorites |
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260 set_f1(call_site()); |
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261 } |
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262 bool is_final = true; |
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263 assert(signature_invoker->is_final_method(), "is_final"); |
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264 set_flags(as_flags(as_TosState(signature_invoker->result_type()), is_final, false, false, false, true) | param_size); |
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265 // do not do set_bytecode on a secondary CP cache entry |
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266 //set_bytecode_1(Bytecodes::_invokedynamic); |
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267 } |
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268 |
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269 |
| 0 | 270 class LocalOopClosure: public OopClosure { |
| 271 private: | |
| 272 void (*_f)(oop*); | |
| 273 | |
| 274 public: | |
| 275 LocalOopClosure(void f(oop*)) { _f = f; } | |
| 276 virtual void do_oop(oop* o) { _f(o); } | |
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277 virtual void do_oop(narrowOop *o) { ShouldNotReachHere(); } |
| 0 | 278 }; |
| 279 | |
| 280 | |
| 281 void ConstantPoolCacheEntry::oops_do(void f(oop*)) { | |
| 282 LocalOopClosure blk(f); | |
| 283 oop_iterate(&blk); | |
| 284 } | |
| 285 | |
| 286 | |
| 287 void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) { | |
| 288 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 289 // field[1] is always oop or NULL | |
| 290 blk->do_oop((oop*)&_f1); | |
| 291 if (is_vfinal()) { | |
| 292 blk->do_oop((oop*)&_f2); | |
| 293 } | |
| 294 } | |
| 295 | |
| 296 | |
| 297 void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
| 298 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 299 // field[1] is always oop or NULL | |
| 300 if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1); | |
| 301 if (is_vfinal()) { | |
| 302 if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2); | |
| 303 } | |
| 304 } | |
| 305 | |
| 306 | |
| 307 void ConstantPoolCacheEntry::follow_contents() { | |
| 308 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 309 // field[1] is always oop or NULL | |
| 310 MarkSweep::mark_and_push((oop*)&_f1); | |
| 311 if (is_vfinal()) { | |
| 312 MarkSweep::mark_and_push((oop*)&_f2); | |
| 313 } | |
| 314 } | |
| 315 | |
| 316 #ifndef SERIALGC | |
| 317 void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) { | |
| 318 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 319 // field[1] is always oop or NULL | |
| 320 PSParallelCompact::mark_and_push(cm, (oop*)&_f1); | |
| 321 if (is_vfinal()) { | |
| 322 PSParallelCompact::mark_and_push(cm, (oop*)&_f2); | |
| 323 } | |
| 324 } | |
| 325 #endif // SERIALGC | |
| 326 | |
| 327 void ConstantPoolCacheEntry::adjust_pointers() { | |
| 328 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 329 // field[1] is always oop or NULL | |
| 330 MarkSweep::adjust_pointer((oop*)&_f1); | |
| 331 if (is_vfinal()) { | |
| 332 MarkSweep::adjust_pointer((oop*)&_f2); | |
| 333 } | |
| 334 } | |
| 335 | |
| 336 #ifndef SERIALGC | |
| 337 void ConstantPoolCacheEntry::update_pointers() { | |
| 338 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 339 // field[1] is always oop or NULL | |
| 340 PSParallelCompact::adjust_pointer((oop*)&_f1); | |
| 341 if (is_vfinal()) { | |
| 342 PSParallelCompact::adjust_pointer((oop*)&_f2); | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 void ConstantPoolCacheEntry::update_pointers(HeapWord* beg_addr, | |
| 347 HeapWord* end_addr) { | |
| 348 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 349 // field[1] is always oop or NULL | |
| 350 PSParallelCompact::adjust_pointer((oop*)&_f1, beg_addr, end_addr); | |
| 351 if (is_vfinal()) { | |
| 352 PSParallelCompact::adjust_pointer((oop*)&_f2, beg_addr, end_addr); | |
| 353 } | |
| 354 } | |
| 355 #endif // SERIALGC | |
| 356 | |
| 357 // RedefineClasses() API support: | |
| 358 // If this constantPoolCacheEntry refers to old_method then update it | |
| 359 // to refer to new_method. | |
| 360 bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method, | |
| 361 methodOop new_method, bool * trace_name_printed) { | |
| 362 | |
| 363 if (is_vfinal()) { | |
| 364 // virtual and final so f2() contains method ptr instead of vtable index | |
| 365 if (f2() == (intptr_t)old_method) { | |
| 366 // match old_method so need an update | |
| 367 _f2 = (intptr_t)new_method; | |
| 368 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 369 if (!(*trace_name_printed)) { | |
| 370 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 371 RC_TRACE_MESG(("adjust: name=%s", | |
| 372 Klass::cast(old_method->method_holder())->external_name())); | |
| 373 *trace_name_printed = true; | |
| 374 } | |
| 375 // RC_TRACE macro has an embedded ResourceMark | |
| 376 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
| 377 new_method->name()->as_C_string(), | |
| 378 new_method->signature()->as_C_string())); | |
| 379 } | |
| 380 | |
| 381 return true; | |
| 382 } | |
| 383 | |
| 384 // f1() is not used with virtual entries so bail out | |
| 385 return false; | |
| 386 } | |
| 387 | |
| 388 if ((oop)_f1 == NULL) { | |
| 389 // NULL f1() means this is a virtual entry so bail out | |
| 390 // We are assuming that the vtable index does not need change. | |
| 391 return false; | |
| 392 } | |
| 393 | |
| 394 if ((oop)_f1 == old_method) { | |
| 395 _f1 = new_method; | |
| 396 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 397 if (!(*trace_name_printed)) { | |
| 398 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 399 RC_TRACE_MESG(("adjust: name=%s", | |
| 400 Klass::cast(old_method->method_holder())->external_name())); | |
| 401 *trace_name_printed = true; | |
| 402 } | |
| 403 // RC_TRACE macro has an embedded ResourceMark | |
| 404 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", | |
| 405 new_method->name()->as_C_string(), | |
| 406 new_method->signature()->as_C_string())); | |
| 407 } | |
| 408 | |
| 409 return true; | |
| 410 } | |
| 411 | |
| 412 return false; | |
| 413 } | |
| 414 | |
| 415 bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) { | |
| 416 if (!is_method_entry()) { | |
| 417 // not a method entry so not interesting by default | |
| 418 return false; | |
| 419 } | |
| 420 | |
| 421 methodOop m = NULL; | |
| 422 if (is_vfinal()) { | |
| 423 // virtual and final so _f2 contains method ptr instead of vtable index | |
| 424 m = (methodOop)_f2; | |
| 425 } else if ((oop)_f1 == NULL) { | |
| 426 // NULL _f1 means this is a virtual entry so also not interesting | |
| 427 return false; | |
| 428 } else { | |
| 429 if (!((oop)_f1)->is_method()) { | |
| 430 // _f1 can also contain a klassOop for an interface | |
| 431 return false; | |
| 432 } | |
| 433 m = (methodOop)_f1; | |
| 434 } | |
| 435 | |
| 436 assert(m != NULL && m->is_method(), "sanity check"); | |
| 437 if (m == NULL || !m->is_method() || m->method_holder() != k) { | |
| 438 // robustness for above sanity checks or method is not in | |
| 439 // the interesting class | |
| 440 return false; | |
| 441 } | |
| 442 | |
| 443 // the method is in the interesting class so the entry is interesting | |
| 444 return true; | |
| 445 } | |
| 446 | |
| 447 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
| 448 // print separator | |
| 449 if (index == 0) tty->print_cr(" -------------"); | |
| 450 // print entry | |
|
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451 tty->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); |
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452 if (is_secondary_entry()) |
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453 tty->print_cr("[%5d|secondary]", main_entry_index()); |
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454 else |
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455 tty->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), constant_pool_index()); |
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456 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)(oop)_f1); |
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457 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); |
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458 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); |
| 0 | 459 tty->print_cr(" -------------"); |
| 460 } | |
| 461 | |
| 462 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
| 463 // not implemented yet | |
| 464 } | |
| 465 | |
| 466 // Implementation of ConstantPoolCache | |
| 467 | |
| 468 void constantPoolCacheOopDesc::initialize(intArray& inverse_index_map) { | |
| 469 assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); | |
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470 for (int i = 0; i < length(); i++) { |
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471 ConstantPoolCacheEntry* e = entry_at(i); |
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472 int original_index = inverse_index_map[i]; |
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473 if ((original_index & Rewriter::_secondary_entry_tag) != 0) { |
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474 int main_index = (original_index - Rewriter::_secondary_entry_tag); |
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475 assert(!entry_at(main_index)->is_secondary_entry(), "valid main index"); |
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476 e->initialize_secondary_entry(main_index); |
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477 } else { |
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478 e->initialize_entry(original_index); |
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479 } |
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480 assert(entry_at(i) == e, "sanity"); |
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481 } |
| 0 | 482 } |
| 483 | |
| 484 // RedefineClasses() API support: | |
| 485 // If any entry of this constantPoolCache points to any of | |
| 486 // old_methods, replace it with the corresponding new_method. | |
| 487 void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 488 int methods_length, bool * trace_name_printed) { | |
| 489 | |
| 490 if (methods_length == 0) { | |
| 491 // nothing to do if there are no methods | |
| 492 return; | |
| 493 } | |
| 494 | |
| 495 // get shorthand for the interesting class | |
| 496 klassOop old_holder = old_methods[0]->method_holder(); | |
| 497 | |
| 498 for (int i = 0; i < length(); i++) { | |
| 499 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { | |
| 500 // skip uninteresting methods | |
| 501 continue; | |
| 502 } | |
| 503 | |
| 504 // The constantPoolCache contains entries for several different | |
| 505 // things, but we only care about methods. In fact, we only care | |
| 506 // about methods in the same class as the one that contains the | |
| 507 // old_methods. At this point, we have an interesting entry. | |
| 508 | |
| 509 for (int j = 0; j < methods_length; j++) { | |
| 510 methodOop old_method = old_methods[j]; | |
| 511 methodOop new_method = new_methods[j]; | |
| 512 | |
| 513 if (entry_at(i)->adjust_method_entry(old_method, new_method, | |
| 514 trace_name_printed)) { | |
| 515 // current old_method matched this entry and we updated it so | |
| 516 // break out and get to the next interesting entry if there one | |
| 517 break; | |
| 518 } | |
| 519 } | |
| 520 } | |
| 521 } |