Mercurial > hg > truffle
annotate src/share/vm/oops/cpCacheOop.cpp @ 844:bd02caa94611
6862919: Update copyright year
Summary: Update copyright for files that have been modified in 2009, up to 07/09
Reviewed-by: tbell, ohair
| author | xdono |
|---|---|
| date | Tue, 28 Jul 2009 12:12:40 -0700 |
| parents | be93aad57795 |
| children | 389049f3f393 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 844 | 2 * Copyright 1998-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_cpCacheOop.cpp.incl" | |
| 27 | |
| 28 | |
| 29 // Implememtation of ConstantPoolCacheEntry | |
| 30 | |
| 31 void ConstantPoolCacheEntry::set_initial_state(int index) { | |
|
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32 if (constantPoolCacheOopDesc::is_secondary_index(index)) { |
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33 // Hack: The rewriter is trying to say that this entry itself |
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34 // will be a secondary entry. |
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35 int main_index = constantPoolCacheOopDesc::decode_secondary_index(index); |
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36 assert(0 <= main_index && main_index < 0x10000, "sanity check"); |
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37 _indices = (main_index << 16); |
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38 assert(main_entry_index() == main_index, ""); |
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39 return; |
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40 } |
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41 assert(0 < index && index < 0x10000, "sanity check"); |
| 0 | 42 _indices = index; |
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43 assert(constant_pool_index() == index, ""); |
| 0 | 44 } |
| 45 | |
| 46 | |
| 47 int ConstantPoolCacheEntry::as_flags(TosState state, bool is_final, | |
| 48 bool is_vfinal, bool is_volatile, | |
| 49 bool is_method_interface, bool is_method) { | |
| 50 int f = state; | |
| 51 | |
| 52 assert( state < number_of_states, "Invalid state in as_flags"); | |
| 53 | |
| 54 f <<= 1; | |
| 55 if (is_final) f |= 1; | |
| 56 f <<= 1; | |
| 57 if (is_vfinal) f |= 1; | |
| 58 f <<= 1; | |
| 59 if (is_volatile) f |= 1; | |
| 60 f <<= 1; | |
| 61 if (is_method_interface) f |= 1; | |
| 62 f <<= 1; | |
| 63 if (is_method) f |= 1; | |
| 64 f <<= ConstantPoolCacheEntry::hotSwapBit; | |
| 65 // Preserve existing flag bit values | |
| 66 #ifdef ASSERT | |
| 67 int old_state = ((_flags >> tosBits) & 0x0F); | |
| 68 assert(old_state == 0 || old_state == state, | |
| 69 "inconsistent cpCache flags state"); | |
| 70 #endif | |
| 71 return (_flags | f) ; | |
| 72 } | |
| 73 | |
| 74 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { | |
| 75 #ifdef ASSERT | |
| 76 // Read once. | |
| 77 volatile Bytecodes::Code c = bytecode_1(); | |
| 78 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
| 79 #endif | |
| 80 // Need to flush pending stores here before bytecode is written. | |
| 81 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 16)); | |
| 82 } | |
| 83 | |
| 84 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
| 85 #ifdef ASSERT | |
| 86 // Read once. | |
| 87 volatile Bytecodes::Code c = bytecode_2(); | |
| 88 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
| 89 #endif | |
| 90 // Need to flush pending stores here before bytecode is written. | |
| 91 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 24)); | |
| 92 } | |
| 93 | |
| 94 #ifdef ASSERT | |
| 95 // It is possible to have two different dummy methodOops created | |
| 96 // when the resolve code for invoke interface executes concurrently | |
| 97 // Hence the assertion below is weakened a bit for the invokeinterface | |
| 98 // case. | |
| 99 bool ConstantPoolCacheEntry::same_methodOop(oop cur_f1, oop f1) { | |
| 100 return (cur_f1 == f1 || ((methodOop)cur_f1)->name() == | |
| 101 ((methodOop)f1)->name() || ((methodOop)cur_f1)->signature() == | |
| 102 ((methodOop)f1)->signature()); | |
| 103 } | |
| 104 #endif | |
| 105 | |
| 106 // Note that concurrent update of both bytecodes can leave one of them | |
| 107 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
| 108 // the damaged entry. More seriously, the memory synchronization is needed | |
| 109 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
| 110 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
| 111 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
| 112 Bytecodes::Code put_code, | |
| 113 KlassHandle field_holder, | |
| 114 int orig_field_index, | |
| 115 int field_offset, | |
| 116 TosState field_type, | |
| 117 bool is_final, | |
| 118 bool is_volatile) { | |
| 119 set_f1(field_holder()); | |
| 120 set_f2(field_offset); | |
| 121 // The field index is used by jvm/ti and is the index into fields() array | |
| 122 // in holder instanceKlass. This is scaled by instanceKlass::next_offset. | |
| 123 assert((orig_field_index % instanceKlass::next_offset) == 0, "wierd index"); | |
| 124 const int field_index = orig_field_index / instanceKlass::next_offset; | |
| 125 assert(field_index <= field_index_mask, | |
| 126 "field index does not fit in low flag bits"); | |
| 127 set_flags(as_flags(field_type, is_final, false, is_volatile, false, false) | | |
| 128 (field_index & field_index_mask)); | |
| 129 set_bytecode_1(get_code); | |
| 130 set_bytecode_2(put_code); | |
| 131 NOT_PRODUCT(verify(tty)); | |
| 132 } | |
| 133 | |
| 134 int ConstantPoolCacheEntry::field_index() const { | |
| 135 return (_flags & field_index_mask) * instanceKlass::next_offset; | |
| 136 } | |
| 137 | |
| 138 void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code, | |
| 139 methodHandle method, | |
| 140 int vtable_index) { | |
| 141 | |
| 142 assert(method->interpreter_entry() != NULL, "should have been set at this point"); | |
| 143 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
| 144 bool change_to_virtual = (invoke_code == Bytecodes::_invokeinterface); | |
| 145 | |
| 146 int byte_no = -1; | |
| 147 bool needs_vfinal_flag = false; | |
| 148 switch (invoke_code) { | |
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149 case Bytecodes::_invokedynamic: |
| 0 | 150 case Bytecodes::_invokevirtual: |
| 151 case Bytecodes::_invokeinterface: { | |
| 152 if (method->can_be_statically_bound()) { | |
| 153 set_f2((intptr_t)method()); | |
| 154 needs_vfinal_flag = true; | |
| 155 } else { | |
| 156 assert(vtable_index >= 0, "valid index"); | |
| 157 set_f2(vtable_index); | |
| 158 } | |
| 159 byte_no = 2; | |
| 160 break; | |
| 161 } | |
| 162 case Bytecodes::_invokespecial: | |
| 163 // Preserve the value of the vfinal flag on invokevirtual bytecode | |
| 164 // which may be shared with this constant pool cache entry. | |
| 165 needs_vfinal_flag = is_resolved(Bytecodes::_invokevirtual) && is_vfinal(); | |
| 166 // fall through | |
| 167 case Bytecodes::_invokestatic: | |
| 168 set_f1(method()); | |
| 169 byte_no = 1; | |
| 170 break; | |
| 171 default: | |
| 172 ShouldNotReachHere(); | |
| 173 break; | |
| 174 } | |
| 175 | |
| 176 set_flags(as_flags(as_TosState(method->result_type()), | |
| 177 method->is_final_method(), | |
| 178 needs_vfinal_flag, | |
| 179 false, | |
| 180 change_to_virtual, | |
| 181 true)| | |
| 182 method()->size_of_parameters()); | |
| 183 | |
| 184 // Note: byte_no also appears in TemplateTable::resolve. | |
| 185 if (byte_no == 1) { | |
| 186 set_bytecode_1(invoke_code); | |
| 187 } else if (byte_no == 2) { | |
| 188 if (change_to_virtual) { | |
| 189 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! | |
| 190 // | |
| 191 // Workaround for the case where we encounter an invokeinterface, but we | |
| 192 // should really have an _invokevirtual since the resolved method is a | |
| 193 // virtual method in java.lang.Object. This is a corner case in the spec | |
| 194 // but is presumably legal. javac does not generate this code. | |
| 195 // | |
| 196 // We set bytecode_1() to _invokeinterface, because that is the | |
| 197 // bytecode # used by the interpreter to see if it is resolved. | |
| 198 // We set bytecode_2() to _invokevirtual. | |
| 199 // See also interpreterRuntime.cpp. (8/25/2000) | |
| 200 // Only set resolved for the invokeinterface case if method is public. | |
| 201 // Otherwise, the method needs to be reresolved with caller for each | |
| 202 // interface call. | |
| 203 if (method->is_public()) set_bytecode_1(invoke_code); | |
| 204 set_bytecode_2(Bytecodes::_invokevirtual); | |
| 205 } else { | |
| 206 set_bytecode_2(invoke_code); | |
| 207 } | |
| 208 } else { | |
| 209 ShouldNotReachHere(); | |
| 210 } | |
| 211 NOT_PRODUCT(verify(tty)); | |
| 212 } | |
| 213 | |
| 214 | |
| 215 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) { | |
| 216 klassOop interf = method->method_holder(); | |
| 217 assert(instanceKlass::cast(interf)->is_interface(), "must be an interface"); | |
| 218 set_f1(interf); | |
| 219 set_f2(index); | |
| 220 set_flags(as_flags(as_TosState(method->result_type()), method->is_final_method(), false, false, false, true) | method()->size_of_parameters()); | |
| 221 set_bytecode_1(Bytecodes::_invokeinterface); | |
| 222 } | |
| 223 | |
| 224 | |
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225 void ConstantPoolCacheEntry::set_dynamic_call(Handle call_site, int extra_data) { |
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226 methodOop method = (methodOop) sun_dyn_CallSiteImpl::vmmethod(call_site()); |
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227 assert(method->is_method(), "must be initialized properly"); |
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228 int param_size = method->size_of_parameters(); |
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229 assert(param_size > 1, "method argument size must include MH.this & initial dynamic receiver"); |
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230 param_size -= 1; // do not count MH.this; it is not stacked for invokedynamic |
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231 if (Atomic::cmpxchg_ptr(call_site(), &_f1, NULL) == NULL) { |
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232 // racing threads might be trying to install their own favorites |
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233 set_f1(call_site()); |
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234 } |
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235 set_f2(extra_data); |
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236 set_flags(as_flags(as_TosState(method->result_type()), method->is_final_method(), false, false, false, true) | param_size); |
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237 // do not do set_bytecode on a secondary CP cache entry |
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238 //set_bytecode_1(Bytecodes::_invokedynamic); |
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239 } |
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240 |
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241 |
| 0 | 242 class LocalOopClosure: public OopClosure { |
| 243 private: | |
| 244 void (*_f)(oop*); | |
| 245 | |
| 246 public: | |
| 247 LocalOopClosure(void f(oop*)) { _f = f; } | |
| 248 virtual void do_oop(oop* o) { _f(o); } | |
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249 virtual void do_oop(narrowOop *o) { ShouldNotReachHere(); } |
| 0 | 250 }; |
| 251 | |
| 252 | |
| 253 void ConstantPoolCacheEntry::oops_do(void f(oop*)) { | |
| 254 LocalOopClosure blk(f); | |
| 255 oop_iterate(&blk); | |
| 256 } | |
| 257 | |
| 258 | |
| 259 void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) { | |
| 260 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 261 // field[1] is always oop or NULL | |
| 262 blk->do_oop((oop*)&_f1); | |
| 263 if (is_vfinal()) { | |
| 264 blk->do_oop((oop*)&_f2); | |
| 265 } | |
| 266 } | |
| 267 | |
| 268 | |
| 269 void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
| 270 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 271 // field[1] is always oop or NULL | |
| 272 if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1); | |
| 273 if (is_vfinal()) { | |
| 274 if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2); | |
| 275 } | |
| 276 } | |
| 277 | |
| 278 | |
| 279 void ConstantPoolCacheEntry::follow_contents() { | |
| 280 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 281 // field[1] is always oop or NULL | |
| 282 MarkSweep::mark_and_push((oop*)&_f1); | |
| 283 if (is_vfinal()) { | |
| 284 MarkSweep::mark_and_push((oop*)&_f2); | |
| 285 } | |
| 286 } | |
| 287 | |
| 288 #ifndef SERIALGC | |
| 289 void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) { | |
| 290 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 291 // field[1] is always oop or NULL | |
| 292 PSParallelCompact::mark_and_push(cm, (oop*)&_f1); | |
| 293 if (is_vfinal()) { | |
| 294 PSParallelCompact::mark_and_push(cm, (oop*)&_f2); | |
| 295 } | |
| 296 } | |
| 297 #endif // SERIALGC | |
| 298 | |
| 299 void ConstantPoolCacheEntry::adjust_pointers() { | |
| 300 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 301 // field[1] is always oop or NULL | |
| 302 MarkSweep::adjust_pointer((oop*)&_f1); | |
| 303 if (is_vfinal()) { | |
| 304 MarkSweep::adjust_pointer((oop*)&_f2); | |
| 305 } | |
| 306 } | |
| 307 | |
| 308 #ifndef SERIALGC | |
| 309 void ConstantPoolCacheEntry::update_pointers() { | |
| 310 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 311 // field[1] is always oop or NULL | |
| 312 PSParallelCompact::adjust_pointer((oop*)&_f1); | |
| 313 if (is_vfinal()) { | |
| 314 PSParallelCompact::adjust_pointer((oop*)&_f2); | |
| 315 } | |
| 316 } | |
| 317 | |
| 318 void ConstantPoolCacheEntry::update_pointers(HeapWord* beg_addr, | |
| 319 HeapWord* end_addr) { | |
| 320 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 321 // field[1] is always oop or NULL | |
| 322 PSParallelCompact::adjust_pointer((oop*)&_f1, beg_addr, end_addr); | |
| 323 if (is_vfinal()) { | |
| 324 PSParallelCompact::adjust_pointer((oop*)&_f2, beg_addr, end_addr); | |
| 325 } | |
| 326 } | |
| 327 #endif // SERIALGC | |
| 328 | |
| 329 // RedefineClasses() API support: | |
| 330 // If this constantPoolCacheEntry refers to old_method then update it | |
| 331 // to refer to new_method. | |
| 332 bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method, | |
| 333 methodOop new_method, bool * trace_name_printed) { | |
| 334 | |
| 335 if (is_vfinal()) { | |
| 336 // virtual and final so f2() contains method ptr instead of vtable index | |
| 337 if (f2() == (intptr_t)old_method) { | |
| 338 // match old_method so need an update | |
| 339 _f2 = (intptr_t)new_method; | |
| 340 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 341 if (!(*trace_name_printed)) { | |
| 342 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 343 RC_TRACE_MESG(("adjust: name=%s", | |
| 344 Klass::cast(old_method->method_holder())->external_name())); | |
| 345 *trace_name_printed = true; | |
| 346 } | |
| 347 // RC_TRACE macro has an embedded ResourceMark | |
| 348 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
| 349 new_method->name()->as_C_string(), | |
| 350 new_method->signature()->as_C_string())); | |
| 351 } | |
| 352 | |
| 353 return true; | |
| 354 } | |
| 355 | |
| 356 // f1() is not used with virtual entries so bail out | |
| 357 return false; | |
| 358 } | |
| 359 | |
| 360 if ((oop)_f1 == NULL) { | |
| 361 // NULL f1() means this is a virtual entry so bail out | |
| 362 // We are assuming that the vtable index does not need change. | |
| 363 return false; | |
| 364 } | |
| 365 | |
| 366 if ((oop)_f1 == old_method) { | |
| 367 _f1 = 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 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 return false; | |
| 385 } | |
| 386 | |
| 387 bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) { | |
| 388 if (!is_method_entry()) { | |
| 389 // not a method entry so not interesting by default | |
| 390 return false; | |
| 391 } | |
| 392 | |
| 393 methodOop m = NULL; | |
| 394 if (is_vfinal()) { | |
| 395 // virtual and final so _f2 contains method ptr instead of vtable index | |
| 396 m = (methodOop)_f2; | |
| 397 } else if ((oop)_f1 == NULL) { | |
| 398 // NULL _f1 means this is a virtual entry so also not interesting | |
| 399 return false; | |
| 400 } else { | |
| 401 if (!((oop)_f1)->is_method()) { | |
| 402 // _f1 can also contain a klassOop for an interface | |
| 403 return false; | |
| 404 } | |
| 405 m = (methodOop)_f1; | |
| 406 } | |
| 407 | |
| 408 assert(m != NULL && m->is_method(), "sanity check"); | |
| 409 if (m == NULL || !m->is_method() || m->method_holder() != k) { | |
| 410 // robustness for above sanity checks or method is not in | |
| 411 // the interesting class | |
| 412 return false; | |
| 413 } | |
| 414 | |
| 415 // the method is in the interesting class so the entry is interesting | |
| 416 return true; | |
| 417 } | |
| 418 | |
| 419 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
| 420 // print separator | |
| 421 if (index == 0) tty->print_cr(" -------------"); | |
| 422 // print entry | |
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423 tty->print_cr("%3d (%08x) ", index, this); |
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424 if (is_secondary_entry()) |
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425 tty->print_cr("[%5d|secondary]", main_entry_index()); |
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426 else |
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427 tty->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), constant_pool_index()); |
| 0 | 428 tty->print_cr(" [ %08x]", (address)(oop)_f1); |
| 429 tty->print_cr(" [ %08x]", _f2); | |
| 430 tty->print_cr(" [ %08x]", _flags); | |
| 431 tty->print_cr(" -------------"); | |
| 432 } | |
| 433 | |
| 434 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
| 435 // not implemented yet | |
| 436 } | |
| 437 | |
| 438 // Implementation of ConstantPoolCache | |
| 439 | |
| 440 void constantPoolCacheOopDesc::initialize(intArray& inverse_index_map) { | |
| 441 assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); | |
| 442 for (int i = 0; i < length(); i++) entry_at(i)->set_initial_state(inverse_index_map[i]); | |
| 443 } | |
| 444 | |
| 445 // RedefineClasses() API support: | |
| 446 // If any entry of this constantPoolCache points to any of | |
| 447 // old_methods, replace it with the corresponding new_method. | |
| 448 void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 449 int methods_length, bool * trace_name_printed) { | |
| 450 | |
| 451 if (methods_length == 0) { | |
| 452 // nothing to do if there are no methods | |
| 453 return; | |
| 454 } | |
| 455 | |
| 456 // get shorthand for the interesting class | |
| 457 klassOop old_holder = old_methods[0]->method_holder(); | |
| 458 | |
| 459 for (int i = 0; i < length(); i++) { | |
| 460 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { | |
| 461 // skip uninteresting methods | |
| 462 continue; | |
| 463 } | |
| 464 | |
| 465 // The constantPoolCache contains entries for several different | |
| 466 // things, but we only care about methods. In fact, we only care | |
| 467 // about methods in the same class as the one that contains the | |
| 468 // old_methods. At this point, we have an interesting entry. | |
| 469 | |
| 470 for (int j = 0; j < methods_length; j++) { | |
| 471 methodOop old_method = old_methods[j]; | |
| 472 methodOop new_method = new_methods[j]; | |
| 473 | |
| 474 if (entry_at(i)->adjust_method_entry(old_method, new_method, | |
| 475 trace_name_printed)) { | |
| 476 // current old_method matched this entry and we updated it so | |
| 477 // break out and get to the next interesting entry if there one | |
| 478 break; | |
| 479 } | |
| 480 } | |
| 481 } | |
| 482 } |