Mon, 09 Jun 2008 11:51:19 -0400
6687581: Make CMS work with compressed oops
Summary: Make FreeChunk read markword instead of LSB in _klass pointer to indicate that it's a FreeChunk for compressed oops.
Reviewed-by: ysr, jmasa
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | #include "incls/_precompiled.incl" |
duke@435 | 26 | #include "incls/_cpCacheOop.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | |
duke@435 | 29 | // Implememtation of ConstantPoolCacheEntry |
duke@435 | 30 | |
duke@435 | 31 | void ConstantPoolCacheEntry::set_initial_state(int index) { |
duke@435 | 32 | assert(0 <= index && index < 0x10000, "sanity check"); |
duke@435 | 33 | _indices = index; |
duke@435 | 34 | } |
duke@435 | 35 | |
duke@435 | 36 | |
duke@435 | 37 | int ConstantPoolCacheEntry::as_flags(TosState state, bool is_final, |
duke@435 | 38 | bool is_vfinal, bool is_volatile, |
duke@435 | 39 | bool is_method_interface, bool is_method) { |
duke@435 | 40 | int f = state; |
duke@435 | 41 | |
duke@435 | 42 | assert( state < number_of_states, "Invalid state in as_flags"); |
duke@435 | 43 | |
duke@435 | 44 | f <<= 1; |
duke@435 | 45 | if (is_final) f |= 1; |
duke@435 | 46 | f <<= 1; |
duke@435 | 47 | if (is_vfinal) f |= 1; |
duke@435 | 48 | f <<= 1; |
duke@435 | 49 | if (is_volatile) f |= 1; |
duke@435 | 50 | f <<= 1; |
duke@435 | 51 | if (is_method_interface) f |= 1; |
duke@435 | 52 | f <<= 1; |
duke@435 | 53 | if (is_method) f |= 1; |
duke@435 | 54 | f <<= ConstantPoolCacheEntry::hotSwapBit; |
duke@435 | 55 | // Preserve existing flag bit values |
duke@435 | 56 | #ifdef ASSERT |
duke@435 | 57 | int old_state = ((_flags >> tosBits) & 0x0F); |
duke@435 | 58 | assert(old_state == 0 || old_state == state, |
duke@435 | 59 | "inconsistent cpCache flags state"); |
duke@435 | 60 | #endif |
duke@435 | 61 | return (_flags | f) ; |
duke@435 | 62 | } |
duke@435 | 63 | |
duke@435 | 64 | void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { |
duke@435 | 65 | #ifdef ASSERT |
duke@435 | 66 | // Read once. |
duke@435 | 67 | volatile Bytecodes::Code c = bytecode_1(); |
duke@435 | 68 | assert(c == 0 || c == code || code == 0, "update must be consistent"); |
duke@435 | 69 | #endif |
duke@435 | 70 | // Need to flush pending stores here before bytecode is written. |
duke@435 | 71 | OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 16)); |
duke@435 | 72 | } |
duke@435 | 73 | |
duke@435 | 74 | void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { |
duke@435 | 75 | #ifdef ASSERT |
duke@435 | 76 | // Read once. |
duke@435 | 77 | volatile Bytecodes::Code c = bytecode_2(); |
duke@435 | 78 | assert(c == 0 || c == code || code == 0, "update must be consistent"); |
duke@435 | 79 | #endif |
duke@435 | 80 | // Need to flush pending stores here before bytecode is written. |
duke@435 | 81 | OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 24)); |
duke@435 | 82 | } |
duke@435 | 83 | |
duke@435 | 84 | #ifdef ASSERT |
duke@435 | 85 | // It is possible to have two different dummy methodOops created |
duke@435 | 86 | // when the resolve code for invoke interface executes concurrently |
duke@435 | 87 | // Hence the assertion below is weakened a bit for the invokeinterface |
duke@435 | 88 | // case. |
duke@435 | 89 | bool ConstantPoolCacheEntry::same_methodOop(oop cur_f1, oop f1) { |
duke@435 | 90 | return (cur_f1 == f1 || ((methodOop)cur_f1)->name() == |
duke@435 | 91 | ((methodOop)f1)->name() || ((methodOop)cur_f1)->signature() == |
duke@435 | 92 | ((methodOop)f1)->signature()); |
duke@435 | 93 | } |
duke@435 | 94 | #endif |
duke@435 | 95 | |
duke@435 | 96 | // Note that concurrent update of both bytecodes can leave one of them |
duke@435 | 97 | // reset to zero. This is harmless; the interpreter will simply re-resolve |
duke@435 | 98 | // the damaged entry. More seriously, the memory synchronization is needed |
duke@435 | 99 | // to flush other fields (f1, f2) completely to memory before the bytecodes |
duke@435 | 100 | // are updated, lest other processors see a non-zero bytecode but zero f1/f2. |
duke@435 | 101 | void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, |
duke@435 | 102 | Bytecodes::Code put_code, |
duke@435 | 103 | KlassHandle field_holder, |
duke@435 | 104 | int orig_field_index, |
duke@435 | 105 | int field_offset, |
duke@435 | 106 | TosState field_type, |
duke@435 | 107 | bool is_final, |
duke@435 | 108 | bool is_volatile) { |
duke@435 | 109 | set_f1(field_holder()); |
duke@435 | 110 | set_f2(field_offset); |
duke@435 | 111 | // The field index is used by jvm/ti and is the index into fields() array |
duke@435 | 112 | // in holder instanceKlass. This is scaled by instanceKlass::next_offset. |
duke@435 | 113 | assert((orig_field_index % instanceKlass::next_offset) == 0, "wierd index"); |
duke@435 | 114 | const int field_index = orig_field_index / instanceKlass::next_offset; |
duke@435 | 115 | assert(field_index <= field_index_mask, |
duke@435 | 116 | "field index does not fit in low flag bits"); |
duke@435 | 117 | set_flags(as_flags(field_type, is_final, false, is_volatile, false, false) | |
duke@435 | 118 | (field_index & field_index_mask)); |
duke@435 | 119 | set_bytecode_1(get_code); |
duke@435 | 120 | set_bytecode_2(put_code); |
duke@435 | 121 | NOT_PRODUCT(verify(tty)); |
duke@435 | 122 | } |
duke@435 | 123 | |
duke@435 | 124 | int ConstantPoolCacheEntry::field_index() const { |
duke@435 | 125 | return (_flags & field_index_mask) * instanceKlass::next_offset; |
duke@435 | 126 | } |
duke@435 | 127 | |
duke@435 | 128 | void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code, |
duke@435 | 129 | methodHandle method, |
duke@435 | 130 | int vtable_index) { |
duke@435 | 131 | |
duke@435 | 132 | assert(method->interpreter_entry() != NULL, "should have been set at this point"); |
duke@435 | 133 | assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); |
duke@435 | 134 | bool change_to_virtual = (invoke_code == Bytecodes::_invokeinterface); |
duke@435 | 135 | |
duke@435 | 136 | int byte_no = -1; |
duke@435 | 137 | bool needs_vfinal_flag = false; |
duke@435 | 138 | switch (invoke_code) { |
duke@435 | 139 | case Bytecodes::_invokevirtual: |
duke@435 | 140 | case Bytecodes::_invokeinterface: { |
duke@435 | 141 | if (method->can_be_statically_bound()) { |
duke@435 | 142 | set_f2((intptr_t)method()); |
duke@435 | 143 | needs_vfinal_flag = true; |
duke@435 | 144 | } else { |
duke@435 | 145 | assert(vtable_index >= 0, "valid index"); |
duke@435 | 146 | set_f2(vtable_index); |
duke@435 | 147 | } |
duke@435 | 148 | byte_no = 2; |
duke@435 | 149 | break; |
duke@435 | 150 | } |
duke@435 | 151 | case Bytecodes::_invokespecial: |
duke@435 | 152 | // Preserve the value of the vfinal flag on invokevirtual bytecode |
duke@435 | 153 | // which may be shared with this constant pool cache entry. |
duke@435 | 154 | needs_vfinal_flag = is_resolved(Bytecodes::_invokevirtual) && is_vfinal(); |
duke@435 | 155 | // fall through |
duke@435 | 156 | case Bytecodes::_invokestatic: |
duke@435 | 157 | set_f1(method()); |
duke@435 | 158 | byte_no = 1; |
duke@435 | 159 | break; |
duke@435 | 160 | default: |
duke@435 | 161 | ShouldNotReachHere(); |
duke@435 | 162 | break; |
duke@435 | 163 | } |
duke@435 | 164 | |
duke@435 | 165 | set_flags(as_flags(as_TosState(method->result_type()), |
duke@435 | 166 | method->is_final_method(), |
duke@435 | 167 | needs_vfinal_flag, |
duke@435 | 168 | false, |
duke@435 | 169 | change_to_virtual, |
duke@435 | 170 | true)| |
duke@435 | 171 | method()->size_of_parameters()); |
duke@435 | 172 | |
duke@435 | 173 | // Note: byte_no also appears in TemplateTable::resolve. |
duke@435 | 174 | if (byte_no == 1) { |
duke@435 | 175 | set_bytecode_1(invoke_code); |
duke@435 | 176 | } else if (byte_no == 2) { |
duke@435 | 177 | if (change_to_virtual) { |
duke@435 | 178 | // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! |
duke@435 | 179 | // |
duke@435 | 180 | // Workaround for the case where we encounter an invokeinterface, but we |
duke@435 | 181 | // should really have an _invokevirtual since the resolved method is a |
duke@435 | 182 | // virtual method in java.lang.Object. This is a corner case in the spec |
duke@435 | 183 | // but is presumably legal. javac does not generate this code. |
duke@435 | 184 | // |
duke@435 | 185 | // We set bytecode_1() to _invokeinterface, because that is the |
duke@435 | 186 | // bytecode # used by the interpreter to see if it is resolved. |
duke@435 | 187 | // We set bytecode_2() to _invokevirtual. |
duke@435 | 188 | // See also interpreterRuntime.cpp. (8/25/2000) |
duke@435 | 189 | // Only set resolved for the invokeinterface case if method is public. |
duke@435 | 190 | // Otherwise, the method needs to be reresolved with caller for each |
duke@435 | 191 | // interface call. |
duke@435 | 192 | if (method->is_public()) set_bytecode_1(invoke_code); |
duke@435 | 193 | set_bytecode_2(Bytecodes::_invokevirtual); |
duke@435 | 194 | } else { |
duke@435 | 195 | set_bytecode_2(invoke_code); |
duke@435 | 196 | } |
duke@435 | 197 | } else { |
duke@435 | 198 | ShouldNotReachHere(); |
duke@435 | 199 | } |
duke@435 | 200 | NOT_PRODUCT(verify(tty)); |
duke@435 | 201 | } |
duke@435 | 202 | |
duke@435 | 203 | |
duke@435 | 204 | void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) { |
duke@435 | 205 | klassOop interf = method->method_holder(); |
duke@435 | 206 | assert(instanceKlass::cast(interf)->is_interface(), "must be an interface"); |
duke@435 | 207 | set_f1(interf); |
duke@435 | 208 | set_f2(index); |
duke@435 | 209 | set_flags(as_flags(as_TosState(method->result_type()), method->is_final_method(), false, false, false, true) | method()->size_of_parameters()); |
duke@435 | 210 | set_bytecode_1(Bytecodes::_invokeinterface); |
duke@435 | 211 | } |
duke@435 | 212 | |
duke@435 | 213 | |
duke@435 | 214 | class LocalOopClosure: public OopClosure { |
duke@435 | 215 | private: |
duke@435 | 216 | void (*_f)(oop*); |
duke@435 | 217 | |
duke@435 | 218 | public: |
duke@435 | 219 | LocalOopClosure(void f(oop*)) { _f = f; } |
duke@435 | 220 | virtual void do_oop(oop* o) { _f(o); } |
coleenp@548 | 221 | virtual void do_oop(narrowOop *o) { ShouldNotReachHere(); } |
duke@435 | 222 | }; |
duke@435 | 223 | |
duke@435 | 224 | |
duke@435 | 225 | void ConstantPoolCacheEntry::oops_do(void f(oop*)) { |
duke@435 | 226 | LocalOopClosure blk(f); |
duke@435 | 227 | oop_iterate(&blk); |
duke@435 | 228 | } |
duke@435 | 229 | |
duke@435 | 230 | |
duke@435 | 231 | void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) { |
duke@435 | 232 | assert(in_words(size()) == 4, "check code below - may need adjustment"); |
duke@435 | 233 | // field[1] is always oop or NULL |
duke@435 | 234 | blk->do_oop((oop*)&_f1); |
duke@435 | 235 | if (is_vfinal()) { |
duke@435 | 236 | blk->do_oop((oop*)&_f2); |
duke@435 | 237 | } |
duke@435 | 238 | } |
duke@435 | 239 | |
duke@435 | 240 | |
duke@435 | 241 | void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) { |
duke@435 | 242 | assert(in_words(size()) == 4, "check code below - may need adjustment"); |
duke@435 | 243 | // field[1] is always oop or NULL |
duke@435 | 244 | if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1); |
duke@435 | 245 | if (is_vfinal()) { |
duke@435 | 246 | if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2); |
duke@435 | 247 | } |
duke@435 | 248 | } |
duke@435 | 249 | |
duke@435 | 250 | |
duke@435 | 251 | void ConstantPoolCacheEntry::follow_contents() { |
duke@435 | 252 | assert(in_words(size()) == 4, "check code below - may need adjustment"); |
duke@435 | 253 | // field[1] is always oop or NULL |
duke@435 | 254 | MarkSweep::mark_and_push((oop*)&_f1); |
duke@435 | 255 | if (is_vfinal()) { |
duke@435 | 256 | MarkSweep::mark_and_push((oop*)&_f2); |
duke@435 | 257 | } |
duke@435 | 258 | } |
duke@435 | 259 | |
duke@435 | 260 | #ifndef SERIALGC |
duke@435 | 261 | void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) { |
duke@435 | 262 | assert(in_words(size()) == 4, "check code below - may need adjustment"); |
duke@435 | 263 | // field[1] is always oop or NULL |
duke@435 | 264 | PSParallelCompact::mark_and_push(cm, (oop*)&_f1); |
duke@435 | 265 | if (is_vfinal()) { |
duke@435 | 266 | PSParallelCompact::mark_and_push(cm, (oop*)&_f2); |
duke@435 | 267 | } |
duke@435 | 268 | } |
duke@435 | 269 | #endif // SERIALGC |
duke@435 | 270 | |
duke@435 | 271 | void ConstantPoolCacheEntry::adjust_pointers() { |
duke@435 | 272 | assert(in_words(size()) == 4, "check code below - may need adjustment"); |
duke@435 | 273 | // field[1] is always oop or NULL |
duke@435 | 274 | MarkSweep::adjust_pointer((oop*)&_f1); |
duke@435 | 275 | if (is_vfinal()) { |
duke@435 | 276 | MarkSweep::adjust_pointer((oop*)&_f2); |
duke@435 | 277 | } |
duke@435 | 278 | } |
duke@435 | 279 | |
duke@435 | 280 | #ifndef SERIALGC |
duke@435 | 281 | void ConstantPoolCacheEntry::update_pointers() { |
duke@435 | 282 | assert(in_words(size()) == 4, "check code below - may need adjustment"); |
duke@435 | 283 | // field[1] is always oop or NULL |
duke@435 | 284 | PSParallelCompact::adjust_pointer((oop*)&_f1); |
duke@435 | 285 | if (is_vfinal()) { |
duke@435 | 286 | PSParallelCompact::adjust_pointer((oop*)&_f2); |
duke@435 | 287 | } |
duke@435 | 288 | } |
duke@435 | 289 | |
duke@435 | 290 | void ConstantPoolCacheEntry::update_pointers(HeapWord* beg_addr, |
duke@435 | 291 | HeapWord* end_addr) { |
duke@435 | 292 | assert(in_words(size()) == 4, "check code below - may need adjustment"); |
duke@435 | 293 | // field[1] is always oop or NULL |
duke@435 | 294 | PSParallelCompact::adjust_pointer((oop*)&_f1, beg_addr, end_addr); |
duke@435 | 295 | if (is_vfinal()) { |
duke@435 | 296 | PSParallelCompact::adjust_pointer((oop*)&_f2, beg_addr, end_addr); |
duke@435 | 297 | } |
duke@435 | 298 | } |
duke@435 | 299 | #endif // SERIALGC |
duke@435 | 300 | |
duke@435 | 301 | // RedefineClasses() API support: |
duke@435 | 302 | // If this constantPoolCacheEntry refers to old_method then update it |
duke@435 | 303 | // to refer to new_method. |
duke@435 | 304 | bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method, |
duke@435 | 305 | methodOop new_method, bool * trace_name_printed) { |
duke@435 | 306 | |
duke@435 | 307 | if (is_vfinal()) { |
duke@435 | 308 | // virtual and final so f2() contains method ptr instead of vtable index |
duke@435 | 309 | if (f2() == (intptr_t)old_method) { |
duke@435 | 310 | // match old_method so need an update |
duke@435 | 311 | _f2 = (intptr_t)new_method; |
duke@435 | 312 | if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { |
duke@435 | 313 | if (!(*trace_name_printed)) { |
duke@435 | 314 | // RC_TRACE_MESG macro has an embedded ResourceMark |
duke@435 | 315 | RC_TRACE_MESG(("adjust: name=%s", |
duke@435 | 316 | Klass::cast(old_method->method_holder())->external_name())); |
duke@435 | 317 | *trace_name_printed = true; |
duke@435 | 318 | } |
duke@435 | 319 | // RC_TRACE macro has an embedded ResourceMark |
duke@435 | 320 | RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", |
duke@435 | 321 | new_method->name()->as_C_string(), |
duke@435 | 322 | new_method->signature()->as_C_string())); |
duke@435 | 323 | } |
duke@435 | 324 | |
duke@435 | 325 | return true; |
duke@435 | 326 | } |
duke@435 | 327 | |
duke@435 | 328 | // f1() is not used with virtual entries so bail out |
duke@435 | 329 | return false; |
duke@435 | 330 | } |
duke@435 | 331 | |
duke@435 | 332 | if ((oop)_f1 == NULL) { |
duke@435 | 333 | // NULL f1() means this is a virtual entry so bail out |
duke@435 | 334 | // We are assuming that the vtable index does not need change. |
duke@435 | 335 | return false; |
duke@435 | 336 | } |
duke@435 | 337 | |
duke@435 | 338 | if ((oop)_f1 == old_method) { |
duke@435 | 339 | _f1 = new_method; |
duke@435 | 340 | if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { |
duke@435 | 341 | if (!(*trace_name_printed)) { |
duke@435 | 342 | // RC_TRACE_MESG macro has an embedded ResourceMark |
duke@435 | 343 | RC_TRACE_MESG(("adjust: name=%s", |
duke@435 | 344 | Klass::cast(old_method->method_holder())->external_name())); |
duke@435 | 345 | *trace_name_printed = true; |
duke@435 | 346 | } |
duke@435 | 347 | // RC_TRACE macro has an embedded ResourceMark |
duke@435 | 348 | RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", |
duke@435 | 349 | new_method->name()->as_C_string(), |
duke@435 | 350 | new_method->signature()->as_C_string())); |
duke@435 | 351 | } |
duke@435 | 352 | |
duke@435 | 353 | return true; |
duke@435 | 354 | } |
duke@435 | 355 | |
duke@435 | 356 | return false; |
duke@435 | 357 | } |
duke@435 | 358 | |
duke@435 | 359 | bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) { |
duke@435 | 360 | if (!is_method_entry()) { |
duke@435 | 361 | // not a method entry so not interesting by default |
duke@435 | 362 | return false; |
duke@435 | 363 | } |
duke@435 | 364 | |
duke@435 | 365 | methodOop m = NULL; |
duke@435 | 366 | if (is_vfinal()) { |
duke@435 | 367 | // virtual and final so _f2 contains method ptr instead of vtable index |
duke@435 | 368 | m = (methodOop)_f2; |
duke@435 | 369 | } else if ((oop)_f1 == NULL) { |
duke@435 | 370 | // NULL _f1 means this is a virtual entry so also not interesting |
duke@435 | 371 | return false; |
duke@435 | 372 | } else { |
duke@435 | 373 | if (!((oop)_f1)->is_method()) { |
duke@435 | 374 | // _f1 can also contain a klassOop for an interface |
duke@435 | 375 | return false; |
duke@435 | 376 | } |
duke@435 | 377 | m = (methodOop)_f1; |
duke@435 | 378 | } |
duke@435 | 379 | |
duke@435 | 380 | assert(m != NULL && m->is_method(), "sanity check"); |
duke@435 | 381 | if (m == NULL || !m->is_method() || m->method_holder() != k) { |
duke@435 | 382 | // robustness for above sanity checks or method is not in |
duke@435 | 383 | // the interesting class |
duke@435 | 384 | return false; |
duke@435 | 385 | } |
duke@435 | 386 | |
duke@435 | 387 | // the method is in the interesting class so the entry is interesting |
duke@435 | 388 | return true; |
duke@435 | 389 | } |
duke@435 | 390 | |
duke@435 | 391 | void ConstantPoolCacheEntry::print(outputStream* st, int index) const { |
duke@435 | 392 | // print separator |
duke@435 | 393 | if (index == 0) tty->print_cr(" -------------"); |
duke@435 | 394 | // print entry |
duke@435 | 395 | tty->print_cr("%3d (%08x) [%02x|%02x|%5d]", index, this, bytecode_2(), bytecode_1(), constant_pool_index()); |
duke@435 | 396 | tty->print_cr(" [ %08x]", (address)(oop)_f1); |
duke@435 | 397 | tty->print_cr(" [ %08x]", _f2); |
duke@435 | 398 | tty->print_cr(" [ %08x]", _flags); |
duke@435 | 399 | tty->print_cr(" -------------"); |
duke@435 | 400 | } |
duke@435 | 401 | |
duke@435 | 402 | void ConstantPoolCacheEntry::verify(outputStream* st) const { |
duke@435 | 403 | // not implemented yet |
duke@435 | 404 | } |
duke@435 | 405 | |
duke@435 | 406 | // Implementation of ConstantPoolCache |
duke@435 | 407 | |
duke@435 | 408 | void constantPoolCacheOopDesc::initialize(intArray& inverse_index_map) { |
duke@435 | 409 | assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); |
duke@435 | 410 | for (int i = 0; i < length(); i++) entry_at(i)->set_initial_state(inverse_index_map[i]); |
duke@435 | 411 | } |
duke@435 | 412 | |
duke@435 | 413 | // RedefineClasses() API support: |
duke@435 | 414 | // If any entry of this constantPoolCache points to any of |
duke@435 | 415 | // old_methods, replace it with the corresponding new_method. |
duke@435 | 416 | void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, |
duke@435 | 417 | int methods_length, bool * trace_name_printed) { |
duke@435 | 418 | |
duke@435 | 419 | if (methods_length == 0) { |
duke@435 | 420 | // nothing to do if there are no methods |
duke@435 | 421 | return; |
duke@435 | 422 | } |
duke@435 | 423 | |
duke@435 | 424 | // get shorthand for the interesting class |
duke@435 | 425 | klassOop old_holder = old_methods[0]->method_holder(); |
duke@435 | 426 | |
duke@435 | 427 | for (int i = 0; i < length(); i++) { |
duke@435 | 428 | if (!entry_at(i)->is_interesting_method_entry(old_holder)) { |
duke@435 | 429 | // skip uninteresting methods |
duke@435 | 430 | continue; |
duke@435 | 431 | } |
duke@435 | 432 | |
duke@435 | 433 | // The constantPoolCache contains entries for several different |
duke@435 | 434 | // things, but we only care about methods. In fact, we only care |
duke@435 | 435 | // about methods in the same class as the one that contains the |
duke@435 | 436 | // old_methods. At this point, we have an interesting entry. |
duke@435 | 437 | |
duke@435 | 438 | for (int j = 0; j < methods_length; j++) { |
duke@435 | 439 | methodOop old_method = old_methods[j]; |
duke@435 | 440 | methodOop new_method = new_methods[j]; |
duke@435 | 441 | |
duke@435 | 442 | if (entry_at(i)->adjust_method_entry(old_method, new_method, |
duke@435 | 443 | trace_name_printed)) { |
duke@435 | 444 | // current old_method matched this entry and we updated it so |
duke@435 | 445 | // break out and get to the next interesting entry if there one |
duke@435 | 446 | break; |
duke@435 | 447 | } |
duke@435 | 448 | } |
duke@435 | 449 | } |
duke@435 | 450 | } |