Mercurial > hg > truffle
annotate src/share/vm/oops/cpCacheOop.cpp @ 3279:08ccee2c4dbf
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Reviewed-by: kvn, never
| author | twisti |
|---|---|
| date | Thu, 21 Apr 2011 00:25:40 -0700 |
| parents | ed69575596ac |
| children | 81d815b05abb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2227 | 2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/shared/markSweep.inline.hpp" | |
| 27 #include "interpreter/interpreter.hpp" | |
| 28 #include "interpreter/rewriter.hpp" | |
| 29 #include "memory/universe.inline.hpp" | |
| 30 #include "oops/cpCacheOop.hpp" | |
| 31 #include "oops/objArrayOop.hpp" | |
| 32 #include "oops/oop.inline.hpp" | |
| 33 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
| 34 #include "runtime/handles.inline.hpp" | |
| 0 | 35 |
| 36 | |
| 37 // Implememtation of ConstantPoolCacheEntry | |
| 38 | |
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39 void ConstantPoolCacheEntry::initialize_entry(int index) { |
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40 assert(0 < index && index < 0x10000, "sanity check"); |
| 0 | 41 _indices = index; |
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42 assert(constant_pool_index() == index, ""); |
| 0 | 43 } |
| 44 | |
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45 void ConstantPoolCacheEntry::initialize_secondary_entry(int main_index) { |
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46 assert(0 <= main_index && main_index < 0x10000, "sanity check"); |
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47 _indices = (main_index << 16); |
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48 assert(main_entry_index() == main_index, ""); |
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49 } |
| 0 | 50 |
| 51 int ConstantPoolCacheEntry::as_flags(TosState state, bool is_final, | |
| 52 bool is_vfinal, bool is_volatile, | |
| 53 bool is_method_interface, bool is_method) { | |
| 54 int f = state; | |
| 55 | |
| 56 assert( state < number_of_states, "Invalid state in as_flags"); | |
| 57 | |
| 58 f <<= 1; | |
| 59 if (is_final) f |= 1; | |
| 60 f <<= 1; | |
| 61 if (is_vfinal) f |= 1; | |
| 62 f <<= 1; | |
| 63 if (is_volatile) f |= 1; | |
| 64 f <<= 1; | |
| 65 if (is_method_interface) f |= 1; | |
| 66 f <<= 1; | |
| 67 if (is_method) f |= 1; | |
| 68 f <<= ConstantPoolCacheEntry::hotSwapBit; | |
| 69 // Preserve existing flag bit values | |
| 70 #ifdef ASSERT | |
| 71 int old_state = ((_flags >> tosBits) & 0x0F); | |
| 72 assert(old_state == 0 || old_state == state, | |
| 73 "inconsistent cpCache flags state"); | |
| 74 #endif | |
| 75 return (_flags | f) ; | |
| 76 } | |
| 77 | |
| 78 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { | |
| 79 #ifdef ASSERT | |
| 80 // Read once. | |
| 81 volatile Bytecodes::Code c = bytecode_1(); | |
| 82 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
| 83 #endif | |
| 84 // Need to flush pending stores here before bytecode is written. | |
| 85 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 16)); | |
| 86 } | |
| 87 | |
| 88 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
| 89 #ifdef ASSERT | |
| 90 // Read once. | |
| 91 volatile Bytecodes::Code c = bytecode_2(); | |
| 92 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
| 93 #endif | |
| 94 // Need to flush pending stores here before bytecode is written. | |
| 95 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 24)); | |
| 96 } | |
| 97 | |
| 1903 | 98 // Atomically sets f1 if it is still NULL, otherwise it keeps the |
| 99 // current value. | |
| 100 void ConstantPoolCacheEntry::set_f1_if_null_atomic(oop f1) { | |
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101 // Use barriers as in oop_store |
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102 oop* f1_addr = (oop*) &_f1; |
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103 update_barrier_set_pre(f1_addr, f1); |
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104 void* result = Atomic::cmpxchg_ptr(f1, f1_addr, NULL); |
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105 bool success = (result == NULL); |
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106 if (success) { |
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107 update_barrier_set((void*) f1_addr, f1); |
| 1903 | 108 } |
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109 } |
| 1903 | 110 |
| 0 | 111 #ifdef ASSERT |
| 112 // It is possible to have two different dummy methodOops created | |
| 113 // when the resolve code for invoke interface executes concurrently | |
| 114 // Hence the assertion below is weakened a bit for the invokeinterface | |
| 115 // case. | |
| 116 bool ConstantPoolCacheEntry::same_methodOop(oop cur_f1, oop f1) { | |
| 117 return (cur_f1 == f1 || ((methodOop)cur_f1)->name() == | |
| 118 ((methodOop)f1)->name() || ((methodOop)cur_f1)->signature() == | |
| 119 ((methodOop)f1)->signature()); | |
| 120 } | |
| 121 #endif | |
| 122 | |
| 123 // Note that concurrent update of both bytecodes can leave one of them | |
| 124 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
| 125 // the damaged entry. More seriously, the memory synchronization is needed | |
| 126 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
| 127 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
| 128 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
| 129 Bytecodes::Code put_code, | |
| 130 KlassHandle field_holder, | |
| 131 int orig_field_index, | |
| 132 int field_offset, | |
| 133 TosState field_type, | |
| 134 bool is_final, | |
| 135 bool is_volatile) { | |
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136 set_f1(field_holder()->java_mirror()); |
| 0 | 137 set_f2(field_offset); |
| 138 // The field index is used by jvm/ti and is the index into fields() array | |
| 139 // in holder instanceKlass. This is scaled by instanceKlass::next_offset. | |
| 140 assert((orig_field_index % instanceKlass::next_offset) == 0, "wierd index"); | |
| 141 const int field_index = orig_field_index / instanceKlass::next_offset; | |
| 142 assert(field_index <= field_index_mask, | |
| 143 "field index does not fit in low flag bits"); | |
| 144 set_flags(as_flags(field_type, is_final, false, is_volatile, false, false) | | |
| 145 (field_index & field_index_mask)); | |
| 146 set_bytecode_1(get_code); | |
| 147 set_bytecode_2(put_code); | |
| 148 NOT_PRODUCT(verify(tty)); | |
| 149 } | |
| 150 | |
| 151 int ConstantPoolCacheEntry::field_index() const { | |
| 152 return (_flags & field_index_mask) * instanceKlass::next_offset; | |
| 153 } | |
| 154 | |
| 155 void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code, | |
| 156 methodHandle method, | |
| 157 int vtable_index) { | |
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158 assert(!is_secondary_entry(), ""); |
| 0 | 159 assert(method->interpreter_entry() != NULL, "should have been set at this point"); |
| 160 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
| 161 bool change_to_virtual = (invoke_code == Bytecodes::_invokeinterface); | |
| 162 | |
| 163 int byte_no = -1; | |
| 164 bool needs_vfinal_flag = false; | |
| 165 switch (invoke_code) { | |
| 166 case Bytecodes::_invokevirtual: | |
| 167 case Bytecodes::_invokeinterface: { | |
| 168 if (method->can_be_statically_bound()) { | |
| 169 set_f2((intptr_t)method()); | |
| 170 needs_vfinal_flag = true; | |
| 171 } else { | |
| 172 assert(vtable_index >= 0, "valid index"); | |
| 173 set_f2(vtable_index); | |
| 174 } | |
| 175 byte_no = 2; | |
| 176 break; | |
| 177 } | |
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178 |
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179 case Bytecodes::_invokedynamic: // similar to _invokevirtual |
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180 if (TraceInvokeDynamic) { |
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181 tty->print_cr("InvokeDynamic set_method%s method="PTR_FORMAT" index=%d", |
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182 (is_secondary_entry() ? " secondary" : ""), |
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183 (intptr_t)method(), vtable_index); |
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184 method->print(); |
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185 this->print(tty, 0); |
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186 } |
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187 assert(method->can_be_statically_bound(), "must be a MH invoker method"); |
| 2460 | 188 assert(_f2 >= constantPoolOopDesc::CPCACHE_INDEX_TAG, "BSM index initialized"); |
| 1903 | 189 // SystemDictionary::find_method_handle_invoke only caches |
| 190 // methods which signature classes are on the boot classpath, | |
| 191 // otherwise the newly created method is returned. To avoid | |
| 192 // races in that case we store the first one coming in into the | |
| 193 // cp-cache atomically if it's still unset. | |
| 194 set_f1_if_null_atomic(method()); | |
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195 needs_vfinal_flag = false; // _f2 is not an oop |
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196 assert(!is_vfinal(), "f2 not an oop"); |
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197 byte_no = 1; // coordinate this with bytecode_number & is_resolved |
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198 break; |
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199 |
| 0 | 200 case Bytecodes::_invokespecial: |
| 201 // Preserve the value of the vfinal flag on invokevirtual bytecode | |
| 202 // which may be shared with this constant pool cache entry. | |
| 203 needs_vfinal_flag = is_resolved(Bytecodes::_invokevirtual) && is_vfinal(); | |
| 204 // fall through | |
| 205 case Bytecodes::_invokestatic: | |
| 206 set_f1(method()); | |
| 207 byte_no = 1; | |
| 208 break; | |
| 209 default: | |
| 210 ShouldNotReachHere(); | |
| 211 break; | |
| 212 } | |
| 213 | |
| 214 set_flags(as_flags(as_TosState(method->result_type()), | |
| 215 method->is_final_method(), | |
| 216 needs_vfinal_flag, | |
| 217 false, | |
| 218 change_to_virtual, | |
| 219 true)| | |
| 220 method()->size_of_parameters()); | |
| 221 | |
| 222 // Note: byte_no also appears in TemplateTable::resolve. | |
| 223 if (byte_no == 1) { | |
| 224 set_bytecode_1(invoke_code); | |
| 225 } else if (byte_no == 2) { | |
| 226 if (change_to_virtual) { | |
| 227 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! | |
| 228 // | |
| 229 // Workaround for the case where we encounter an invokeinterface, but we | |
| 230 // should really have an _invokevirtual since the resolved method is a | |
| 231 // virtual method in java.lang.Object. This is a corner case in the spec | |
| 232 // but is presumably legal. javac does not generate this code. | |
| 233 // | |
| 234 // We set bytecode_1() to _invokeinterface, because that is the | |
| 235 // bytecode # used by the interpreter to see if it is resolved. | |
| 236 // We set bytecode_2() to _invokevirtual. | |
| 237 // See also interpreterRuntime.cpp. (8/25/2000) | |
| 238 // Only set resolved for the invokeinterface case if method is public. | |
| 239 // Otherwise, the method needs to be reresolved with caller for each | |
| 240 // interface call. | |
| 241 if (method->is_public()) set_bytecode_1(invoke_code); | |
| 242 set_bytecode_2(Bytecodes::_invokevirtual); | |
| 243 } else { | |
| 244 set_bytecode_2(invoke_code); | |
| 245 } | |
| 246 } else { | |
| 247 ShouldNotReachHere(); | |
| 248 } | |
| 249 NOT_PRODUCT(verify(tty)); | |
| 250 } | |
| 251 | |
| 252 | |
| 253 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) { | |
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254 assert(!is_secondary_entry(), ""); |
| 0 | 255 klassOop interf = method->method_holder(); |
| 256 assert(instanceKlass::cast(interf)->is_interface(), "must be an interface"); | |
| 257 set_f1(interf); | |
| 258 set_f2(index); | |
| 259 set_flags(as_flags(as_TosState(method->result_type()), method->is_final_method(), false, false, false, true) | method()->size_of_parameters()); | |
| 260 set_bytecode_1(Bytecodes::_invokeinterface); | |
| 261 } | |
| 262 | |
| 263 | |
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264 void ConstantPoolCacheEntry::initialize_bootstrap_method_index_in_cache(int bsm_cache_index) { |
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265 assert(!is_secondary_entry(), "only for JVM_CONSTANT_InvokeDynamic main entry"); |
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266 assert(_f2 == 0, "initialize once"); |
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267 assert(bsm_cache_index == (int)(u2)bsm_cache_index, "oob"); |
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268 set_f2(bsm_cache_index + constantPoolOopDesc::CPCACHE_INDEX_TAG); |
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269 } |
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270 |
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271 int ConstantPoolCacheEntry::bootstrap_method_index_in_cache() { |
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272 assert(!is_secondary_entry(), "only for JVM_CONSTANT_InvokeDynamic main entry"); |
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273 intptr_t bsm_cache_index = (intptr_t) _f2 - constantPoolOopDesc::CPCACHE_INDEX_TAG; |
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274 assert(bsm_cache_index == (intptr_t)(u2)bsm_cache_index, "oob"); |
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275 return (int) bsm_cache_index; |
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276 } |
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277 |
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278 void ConstantPoolCacheEntry::set_dynamic_call(Handle call_site, methodHandle signature_invoker) { |
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279 assert(is_secondary_entry(), ""); |
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280 // NOTE: it's important that all other values are set before f1 is |
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281 // set since some users short circuit on f1 being set |
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282 // (i.e. non-null) and that may result in uninitialized values for |
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283 // other racing threads (e.g. flags). |
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284 int param_size = signature_invoker->size_of_parameters(); |
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285 assert(param_size >= 1, "method argument size must include MH.this"); |
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286 param_size -= 1; // do not count MH.this; it is not stacked for invokedynamic |
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287 bool is_final = true; |
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288 assert(signature_invoker->is_final_method(), "is_final"); |
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289 int flags = as_flags(as_TosState(signature_invoker->result_type()), is_final, false, false, false, true) | param_size; |
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290 assert(_flags == 0 || _flags == flags, "flags should be the same"); |
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291 set_flags(flags); |
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292 // do not do set_bytecode on a secondary CP cache entry |
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293 //set_bytecode_1(Bytecodes::_invokedynamic); |
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294 set_f1_if_null_atomic(call_site()); // This must be the last one to set (see NOTE above)! |
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295 } |
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296 |
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297 |
| 0 | 298 class LocalOopClosure: public OopClosure { |
| 299 private: | |
| 300 void (*_f)(oop*); | |
| 301 | |
| 302 public: | |
| 303 LocalOopClosure(void f(oop*)) { _f = f; } | |
| 304 virtual void do_oop(oop* o) { _f(o); } | |
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305 virtual void do_oop(narrowOop *o) { ShouldNotReachHere(); } |
| 0 | 306 }; |
| 307 | |
| 308 | |
| 309 void ConstantPoolCacheEntry::oops_do(void f(oop*)) { | |
| 310 LocalOopClosure blk(f); | |
| 311 oop_iterate(&blk); | |
| 312 } | |
| 313 | |
| 314 | |
| 315 void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) { | |
| 316 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 317 // field[1] is always oop or NULL | |
| 318 blk->do_oop((oop*)&_f1); | |
| 319 if (is_vfinal()) { | |
| 320 blk->do_oop((oop*)&_f2); | |
| 321 } | |
| 322 } | |
| 323 | |
| 324 | |
| 325 void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
| 326 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 327 // field[1] is always oop or NULL | |
| 328 if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1); | |
| 329 if (is_vfinal()) { | |
| 330 if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2); | |
| 331 } | |
| 332 } | |
| 333 | |
| 334 | |
| 335 void ConstantPoolCacheEntry::follow_contents() { | |
| 336 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 337 // field[1] is always oop or NULL | |
| 338 MarkSweep::mark_and_push((oop*)&_f1); | |
| 339 if (is_vfinal()) { | |
| 340 MarkSweep::mark_and_push((oop*)&_f2); | |
| 341 } | |
| 342 } | |
| 343 | |
| 344 #ifndef SERIALGC | |
| 345 void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) { | |
| 346 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 347 // field[1] is always oop or NULL | |
| 348 PSParallelCompact::mark_and_push(cm, (oop*)&_f1); | |
| 349 if (is_vfinal()) { | |
| 350 PSParallelCompact::mark_and_push(cm, (oop*)&_f2); | |
| 351 } | |
| 352 } | |
| 353 #endif // SERIALGC | |
| 354 | |
| 355 void ConstantPoolCacheEntry::adjust_pointers() { | |
| 356 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 357 // field[1] is always oop or NULL | |
| 358 MarkSweep::adjust_pointer((oop*)&_f1); | |
| 359 if (is_vfinal()) { | |
| 360 MarkSweep::adjust_pointer((oop*)&_f2); | |
| 361 } | |
| 362 } | |
| 363 | |
| 364 #ifndef SERIALGC | |
| 365 void ConstantPoolCacheEntry::update_pointers() { | |
| 366 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
| 367 // field[1] is always oop or NULL | |
| 368 PSParallelCompact::adjust_pointer((oop*)&_f1); | |
| 369 if (is_vfinal()) { | |
| 370 PSParallelCompact::adjust_pointer((oop*)&_f2); | |
| 371 } | |
| 372 } | |
| 373 #endif // SERIALGC | |
| 374 | |
| 375 // RedefineClasses() API support: | |
| 376 // If this constantPoolCacheEntry refers to old_method then update it | |
| 377 // to refer to new_method. | |
| 378 bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method, | |
| 379 methodOop new_method, bool * trace_name_printed) { | |
| 380 | |
| 381 if (is_vfinal()) { | |
| 382 // virtual and final so f2() contains method ptr instead of vtable index | |
| 383 if (f2() == (intptr_t)old_method) { | |
| 384 // match old_method so need an update | |
| 385 _f2 = (intptr_t)new_method; | |
| 386 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 387 if (!(*trace_name_printed)) { | |
| 388 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 389 RC_TRACE_MESG(("adjust: name=%s", | |
| 390 Klass::cast(old_method->method_holder())->external_name())); | |
| 391 *trace_name_printed = true; | |
| 392 } | |
| 393 // RC_TRACE macro has an embedded ResourceMark | |
| 394 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
| 395 new_method->name()->as_C_string(), | |
| 396 new_method->signature()->as_C_string())); | |
| 397 } | |
| 398 | |
| 399 return true; | |
| 400 } | |
| 401 | |
| 402 // f1() is not used with virtual entries so bail out | |
| 403 return false; | |
| 404 } | |
| 405 | |
| 406 if ((oop)_f1 == NULL) { | |
| 407 // NULL f1() means this is a virtual entry so bail out | |
| 408 // We are assuming that the vtable index does not need change. | |
| 409 return false; | |
| 410 } | |
| 411 | |
| 412 if ((oop)_f1 == old_method) { | |
| 413 _f1 = new_method; | |
| 414 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 415 if (!(*trace_name_printed)) { | |
| 416 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 417 RC_TRACE_MESG(("adjust: name=%s", | |
| 418 Klass::cast(old_method->method_holder())->external_name())); | |
| 419 *trace_name_printed = true; | |
| 420 } | |
| 421 // RC_TRACE macro has an embedded ResourceMark | |
| 422 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", | |
| 423 new_method->name()->as_C_string(), | |
| 424 new_method->signature()->as_C_string())); | |
| 425 } | |
| 426 | |
| 427 return true; | |
| 428 } | |
| 429 | |
| 430 return false; | |
| 431 } | |
| 432 | |
| 433 bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) { | |
| 434 if (!is_method_entry()) { | |
| 435 // not a method entry so not interesting by default | |
| 436 return false; | |
| 437 } | |
| 438 | |
| 439 methodOop m = NULL; | |
| 440 if (is_vfinal()) { | |
| 441 // virtual and final so _f2 contains method ptr instead of vtable index | |
| 442 m = (methodOop)_f2; | |
| 443 } else if ((oop)_f1 == NULL) { | |
| 444 // NULL _f1 means this is a virtual entry so also not interesting | |
| 445 return false; | |
| 446 } else { | |
| 447 if (!((oop)_f1)->is_method()) { | |
| 448 // _f1 can also contain a klassOop for an interface | |
| 449 return false; | |
| 450 } | |
| 451 m = (methodOop)_f1; | |
| 452 } | |
| 453 | |
| 454 assert(m != NULL && m->is_method(), "sanity check"); | |
| 455 if (m == NULL || !m->is_method() || m->method_holder() != k) { | |
| 456 // robustness for above sanity checks or method is not in | |
| 457 // the interesting class | |
| 458 return false; | |
| 459 } | |
| 460 | |
| 461 // the method is in the interesting class so the entry is interesting | |
| 462 return true; | |
| 463 } | |
| 464 | |
| 465 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
| 466 // print separator | |
| 467 if (index == 0) tty->print_cr(" -------------"); | |
| 468 // print entry | |
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469 tty->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); |
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470 if (is_secondary_entry()) |
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471 tty->print_cr("[%5d|secondary]", main_entry_index()); |
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472 else |
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473 tty->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), constant_pool_index()); |
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474 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)(oop)_f1); |
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475 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); |
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476 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); |
| 0 | 477 tty->print_cr(" -------------"); |
| 478 } | |
| 479 | |
| 480 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
| 481 // not implemented yet | |
| 482 } | |
| 483 | |
| 484 // Implementation of ConstantPoolCache | |
| 485 | |
| 486 void constantPoolCacheOopDesc::initialize(intArray& inverse_index_map) { | |
| 487 assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); | |
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488 for (int i = 0; i < length(); i++) { |
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489 ConstantPoolCacheEntry* e = entry_at(i); |
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490 int original_index = inverse_index_map[i]; |
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491 if ((original_index & Rewriter::_secondary_entry_tag) != 0) { |
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492 int main_index = (original_index - Rewriter::_secondary_entry_tag); |
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493 assert(!entry_at(main_index)->is_secondary_entry(), "valid main index"); |
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494 e->initialize_secondary_entry(main_index); |
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495 } else { |
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496 e->initialize_entry(original_index); |
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497 } |
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498 assert(entry_at(i) == e, "sanity"); |
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499 } |
| 0 | 500 } |
| 501 | |
| 502 // RedefineClasses() API support: | |
| 503 // If any entry of this constantPoolCache points to any of | |
| 504 // old_methods, replace it with the corresponding new_method. | |
| 505 void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 506 int methods_length, bool * trace_name_printed) { | |
| 507 | |
| 508 if (methods_length == 0) { | |
| 509 // nothing to do if there are no methods | |
| 510 return; | |
| 511 } | |
| 512 | |
| 513 // get shorthand for the interesting class | |
| 514 klassOop old_holder = old_methods[0]->method_holder(); | |
| 515 | |
| 516 for (int i = 0; i < length(); i++) { | |
| 517 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { | |
| 518 // skip uninteresting methods | |
| 519 continue; | |
| 520 } | |
| 521 | |
| 522 // The constantPoolCache contains entries for several different | |
| 523 // things, but we only care about methods. In fact, we only care | |
| 524 // about methods in the same class as the one that contains the | |
| 525 // old_methods. At this point, we have an interesting entry. | |
| 526 | |
| 527 for (int j = 0; j < methods_length; j++) { | |
| 528 methodOop old_method = old_methods[j]; | |
| 529 methodOop new_method = new_methods[j]; | |
| 530 | |
| 531 if (entry_at(i)->adjust_method_entry(old_method, new_method, | |
| 532 trace_name_printed)) { | |
| 533 // current old_method matched this entry and we updated it so | |
| 534 // break out and get to the next interesting entry if there one | |
| 535 break; | |
| 536 } | |
| 537 } | |
| 538 } | |
| 539 } |