1 /* 2 * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_CPCACHEOOP_HPP 26 #define SHARE_VM_OOPS_CPCACHEOOP_HPP 27 28 #include "interpreter/bytecodes.hpp" 29 #include "memory/allocation.hpp" 30 #include "oops/array.hpp" 31 #include "oops/oopHandle.hpp" 32 #include "runtime/orderAccess.hpp" 33 #include "utilities/align.hpp" 34 #include "utilities/constantTag.hpp" 35 36 class PSPromotionManager; 37 38 // The ConstantPoolCache is not a cache! It is the resolution table that the 39 // interpreter uses to avoid going into the runtime and a way to access resolved 40 // values. 41 42 // A ConstantPoolCacheEntry describes an individual entry of the constant 43 // pool cache. There's 2 principal kinds of entries: field entries for in- 44 // stance & static field access, and method entries for invokes. Some of 45 // the entry layout is shared and looks as follows: 46 // 47 // bit number |31 0| 48 // bit length |-8--|-8--|---16----| 49 // -------------------------------- 50 // _indices [ b2 | b1 | index ] index = constant_pool_index 51 // _f1 [ entry specific ] metadata ptr (method or klass) 52 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr 53 // _flags [tos|0|F=1|0|0|i|f|v|0 |0000|field_index] (for field entries) 54 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |1 |-3-|----16-----] 55 // _flags [tos|0|F=0|M|A|I|f|0|vf|indy_rf|000|00000|psize] (for method entries) 56 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--] 57 58 // -------------------------------- 59 // 60 // with: 61 // index = original constant pool index 62 // b1 = bytecode 1 63 // b2 = bytecode 2 64 // psize = parameters size (method entries only) 65 // field_index = index into field information in holder InstanceKlass 66 // The index max is 0xffff (max number of fields in constant pool) 67 // and is multiplied by (InstanceKlass::next_offset) when accessing. 68 // tos = TosState 69 // F = the entry is for a field (or F=0 for a method) 70 // A = call site has an appendix argument (loaded from resolved references) 71 // I = interface call is forced virtual (must use a vtable index or vfinal) 72 // f = field or method is final 73 // v = field is volatile 74 // vf = virtual but final (method entries only: is_vfinal()) 75 // indy_rf = call site specifier method resolution failed 76 // 77 // The flags after TosState have the following interpretation: 78 // bit 27: 0 for fields, 1 for methods 79 // i flag true if field is inlined (flatten) 80 // f flag true if field is marked final 81 // v flag true if field is volatile (only for fields) 82 // f2 flag true if f2 contains an oop (e.g., virtual final method) 83 // fv flag true if invokeinterface used for method in class Object 84 // 85 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 16 with the 86 // following mapping to the TosState states: 87 // 88 // btos: 0 89 // ztos: 1 90 // ctos: 2 91 // stos: 3 92 // itos: 4 93 // ltos: 5 94 // ftos: 6 95 // dtos: 7 96 // atos: 8 97 // qtos: 9 98 // vtos: 10 99 // 100 // Entry specific: field entries: 101 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index 102 // _f1 = field holder (as a java.lang.Class, not a Klass*) 103 // _f2 = field offset in bytes 104 // _flags = field type information, original FieldInfo index in field holder 105 // (field_index section) 106 // 107 // Entry specific: method entries: 108 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section), 109 // original constant pool index 110 // _f1 = Method* for non-virtual calls, unused by virtual calls. 111 // for interface calls, which are essentially virtual but need a klass, 112 // contains Klass* for the corresponding interface. 113 // for invokedynamic and invokehandle, f1 contains the adapter method which 114 // manages the actual call. The appendix is stored in the ConstantPool 115 // resolved_references array. 116 // (upcoming metadata changes will move the appendix to a separate array) 117 // _f2 = vtable/itable index (or final Method*) for virtual calls only, 118 // unused by non-virtual. The is_vfinal flag indicates this is a 119 // method pointer for a final method, not an index. 120 // _flags = method type info (t section), 121 // virtual final bit (vfinal), 122 // parameter size (psize section) 123 // 124 // Note: invokevirtual & invokespecial bytecodes can share the same constant 125 // pool entry and thus the same constant pool cache entry. All invoke 126 // bytecodes but invokevirtual use only _f1 and the corresponding b1 127 // bytecode, while invokevirtual uses only _f2 and the corresponding 128 // b2 bytecode. The value of _flags is shared for both types of entries. 129 // 130 // The fields are volatile so that they are stored in the order written in the 131 // source code. The _indices field with the bytecode must be written last. 132 133 class CallInfo; 134 135 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC { 136 friend class VMStructs; 137 friend class constantPoolCacheKlass; 138 friend class ConstantPool; 139 friend class InterpreterRuntime; 140 141 private: 142 volatile intx _indices; // constant pool index & rewrite bytecodes 143 Metadata* volatile _f1; // entry specific metadata field 144 volatile intx _f2; // entry specific int/metadata field 145 volatile intx _flags; // flags 146 147 148 void set_bytecode_1(Bytecodes::Code code); 149 void set_bytecode_2(Bytecodes::Code code); 150 void set_f1(Metadata* f1) { 151 Metadata* existing_f1 = _f1; // read once 152 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change"); 153 _f1 = f1; 154 } 155 void release_set_f1(Metadata* f1); 156 void set_f2(intx f2) { 157 intx existing_f2 = _f2; // read once 158 assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change"); 159 _f2 = f2; 160 } 161 void set_f2_as_vfinal_method(Method* f2) { 162 assert(is_vfinal(), "flags must be set"); 163 set_f2((intx)f2); 164 } 165 int make_flags(TosState state, int option_bits, int field_index_or_method_params); 166 void set_flags(intx flags) { _flags = flags; } 167 void set_field_flags(TosState field_type, int option_bits, int field_index) { 168 assert((field_index & field_index_mask) == field_index, "field_index in range"); 169 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index)); 170 } 171 void set_method_flags(TosState return_type, int option_bits, int method_params) { 172 assert((method_params & parameter_size_mask) == method_params, "method_params in range"); 173 set_flags(make_flags(return_type, option_bits, method_params)); 174 } 175 176 public: 177 // specific bit definitions for the flags field: 178 // (Note: the interpreter must use these definitions to access the CP cache.) 179 enum { 180 // high order bits are the TosState corresponding to field type or method return type 181 tos_state_bits = 4, 182 tos_state_mask = right_n_bits(tos_state_bits), 183 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below 184 // misc. option bits; can be any bit position in [16..27] 185 is_field_entry_shift = 26, // (F) is it a field or a method? 186 has_method_type_shift = 25, // (M) does the call site have a MethodType? 187 has_appendix_shift = 24, // (A) does the call site have an appendix argument? 188 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode? 189 is_flatten_field = 23, // (i) is the value field flatten? 190 is_final_shift = 22, // (f) is the field or method final? 191 is_volatile_shift = 21, // (v) is the field volatile? 192 is_vfinal_shift = 20, // (vf) did the call resolve to a final method? 193 indy_resolution_failed_shift= 19, // (indy_rf) did call site specifier resolution fail ? 194 // low order bits give field index (for FieldInfo) or method parameter size: 195 field_index_bits = 16, 196 field_index_mask = right_n_bits(field_index_bits), 197 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255 198 parameter_size_mask = right_n_bits(parameter_size_bits), 199 option_bits_mask = ~(((~0u) << tos_state_shift) | (field_index_mask | parameter_size_mask)) 200 }; 201 202 // specific bit definitions for the indices field: 203 enum { 204 cp_index_bits = 2*BitsPerByte, 205 cp_index_mask = right_n_bits(cp_index_bits), 206 bytecode_1_shift = cp_index_bits, 207 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF 208 bytecode_2_shift = cp_index_bits + BitsPerByte, 209 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF 210 }; 211 212 213 // Initialization 214 void initialize_entry(int original_index); // initialize primary entry 215 void initialize_resolved_reference_index(int ref_index) { 216 assert(_f2 == 0, "set once"); // note: ref_index might be zero also 217 _f2 = ref_index; 218 } 219 220 void set_field( // sets entry to resolved field state 221 Bytecodes::Code get_code, // the bytecode used for reading the field 222 Bytecodes::Code put_code, // the bytecode used for writing the field 223 Klass* field_holder, // the object/klass holding the field 224 int orig_field_index, // the original field index in the field holder 225 int field_offset, // the field offset in words in the field holder 226 TosState field_type, // the (machine) field type 227 bool is_final, // the field is final 228 bool is_volatile, // the field is volatile 229 bool is_flatten, // the field is flatten (value field) 230 Klass* root_klass // needed by the GC to dirty the klass 231 ); 232 233 private: 234 void set_direct_or_vtable_call( 235 Bytecodes::Code invoke_code, // the bytecode used for invoking the method 236 const methodHandle& method, // the method/prototype if any (NULL, otherwise) 237 int vtable_index, // the vtable index if any, else negative 238 bool sender_is_interface 239 ); 240 241 public: 242 void set_direct_call( // sets entry to exact concrete method entry 243 Bytecodes::Code invoke_code, // the bytecode used for invoking the method 244 const methodHandle& method, // the method to call 245 bool sender_is_interface 246 ); 247 248 void set_vtable_call( // sets entry to vtable index 249 Bytecodes::Code invoke_code, // the bytecode used for invoking the method 250 const methodHandle& method, // resolved method which declares the vtable index 251 int vtable_index // the vtable index 252 ); 253 254 void set_itable_call( 255 Bytecodes::Code invoke_code, // the bytecode used; must be invokeinterface 256 Klass* referenced_klass, // the referenced klass in the InterfaceMethodref 257 const methodHandle& method, // the resolved interface method 258 int itable_index // index into itable for the method 259 ); 260 261 void set_method_handle( 262 const constantPoolHandle& cpool, // holding constant pool (required for locking) 263 const CallInfo &call_info // Call link information 264 ); 265 266 void set_dynamic_call( 267 const constantPoolHandle& cpool, // holding constant pool (required for locking) 268 const CallInfo &call_info // Call link information 269 ); 270 271 // Common code for invokedynamic and MH invocations. 272 273 // The "appendix" is an optional call-site-specific parameter which is 274 // pushed by the JVM at the end of the argument list. This argument may 275 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic 276 // instruction. However, its exact type and use depends on the Java upcall, 277 // which simply returns a compiled LambdaForm along with any reference 278 // that LambdaForm needs to complete the call. If the upcall returns a 279 // null appendix, the argument is not passed at all. 280 // 281 // The appendix is *not* represented in the signature of the symbolic 282 // reference for the call site, but (if present) it *is* represented in 283 // the Method* bound to the site. This means that static and dynamic 284 // resolution logic needs to make slightly different assessments about the 285 // number and types of arguments. 286 void set_method_handle_common( 287 const constantPoolHandle& cpool, // holding constant pool (required for locking) 288 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic 289 const CallInfo &call_info // Call link information 290 ); 291 292 // Return TRUE if resolution failed and this thread got to record the failure 293 // status. Return FALSE if another thread succeeded or failed in resolving 294 // the method and recorded the success or failure before this thread had a 295 // chance to record its failure. 296 bool save_and_throw_indy_exc(const constantPoolHandle& cpool, int cpool_index, 297 int index, constantTag tag, TRAPS); 298 299 // invokedynamic and invokehandle call sites have two entries in the 300 // resolved references array: 301 // appendix (at index+0) 302 // MethodType (at index+1) 303 enum { 304 _indy_resolved_references_appendix_offset = 0, 305 _indy_resolved_references_method_type_offset = 1, 306 _indy_resolved_references_entries 307 }; 308 309 Method* method_if_resolved(const constantPoolHandle& cpool); 310 oop appendix_if_resolved(const constantPoolHandle& cpool); 311 oop method_type_if_resolved(const constantPoolHandle& cpool); 312 313 void set_parameter_size(int value); 314 315 // Which bytecode number (1 or 2) in the index field is valid for this bytecode? 316 // Returns -1 if neither is valid. 317 static int bytecode_number(Bytecodes::Code code) { 318 switch (code) { 319 case Bytecodes::_getstatic : // fall through 320 case Bytecodes::_getfield : // fall through 321 case Bytecodes::_invokespecial : // fall through 322 case Bytecodes::_invokestatic : // fall through 323 case Bytecodes::_invokehandle : // fall through 324 case Bytecodes::_invokedynamic : // fall through 325 case Bytecodes::_invokeinterface : return 1; 326 case Bytecodes::_putstatic : // fall through 327 case Bytecodes::_putfield : // fall through 328 case Bytecodes::_vwithfield : // fall through 329 case Bytecodes::_invokevirtual : return 2; 330 default : break; 331 } 332 return -1; 333 } 334 335 // Has this bytecode been resolved? Only valid for invokes and get/put field/static. 336 bool is_resolved(Bytecodes::Code code) const { 337 switch (bytecode_number(code)) { 338 case 1: return (bytecode_1() == code); 339 case 2: return (bytecode_2() == code); 340 } 341 return false; // default: not resolved 342 } 343 344 // Accessors 345 int indices() const { return _indices; } 346 int indices_ord() const { return OrderAccess::load_acquire(&_indices); } 347 int constant_pool_index() const { return (indices() & cp_index_mask); } 348 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((indices_ord() >> bytecode_1_shift) & bytecode_1_mask); } 349 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((indices_ord() >> bytecode_2_shift) & bytecode_2_mask); } 350 Metadata* f1_ord() const { return (Metadata *)OrderAccess::load_acquire(&_f1); } 351 Method* f1_as_method() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; } 352 Klass* f1_as_klass() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; } 353 // Use the accessor f1() to acquire _f1's value. This is needed for 354 // example in BytecodeInterpreter::run(), where is_f1_null() is 355 // called to check if an invokedynamic call is resolved. This load 356 // of _f1 must be ordered with the loads performed by 357 // cache->main_entry_index(). 358 bool is_f1_null() const { Metadata* f1 = f1_ord(); return f1 == NULL; } // classifies a CPC entry as unbound 359 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; } 360 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; } 361 Method* f2_as_interface_method() const { assert(bytecode_1() == Bytecodes::_invokeinterface, ""); return (Method*)_f2; } 362 int f2_as_offset() const { assert(is_field_entry(), ""); return (int)_f2; } 363 intx flags_ord() const { return (intx)OrderAccess::load_acquire(&_flags); } 364 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); } 365 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); } 366 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; } 367 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; } 368 bool is_flatten() const { return (_flags & (1 << is_flatten_field)) != 0; } 369 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; } 370 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; } 371 bool indy_resolution_failed() const { intx flags = flags_ord(); return (flags & (1 << indy_resolution_failed_shift)) != 0; } 372 bool has_appendix() const { return (!is_f1_null()) && (_flags & (1 << has_appendix_shift)) != 0; } 373 bool has_method_type() const { return (!is_f1_null()) && (_flags & (1 << has_method_type_shift)) != 0; } 374 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; } 375 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; } 376 bool is_long() const { return flag_state() == ltos; } 377 bool is_double() const { return flag_state() == dtos; } 378 bool is_valuetype() const { return flag_state() == qtos; } 379 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, ""); 380 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); } 381 void set_indy_resolution_failed(); 382 383 // Code generation support 384 static WordSize size() { 385 return in_WordSize(align_up((int)sizeof(ConstantPoolCacheEntry), wordSize) / wordSize); 386 } 387 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); } 388 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); } 389 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); } 390 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); } 391 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); } 392 393 #if INCLUDE_JVMTI 394 // RedefineClasses() API support: 395 // If this ConstantPoolCacheEntry refers to old_method then update it 396 // to refer to new_method. 397 // trace_name_printed is set to true if the current call has 398 // printed the klass name so that other routines in the adjust_* 399 // group don't print the klass name. 400 void adjust_method_entry(Method* old_method, Method* new_method, 401 bool* trace_name_printed); 402 bool check_no_old_or_obsolete_entries(); 403 Method* get_interesting_method_entry(Klass* k); 404 #endif // INCLUDE_JVMTI 405 406 // Debugging & Printing 407 void print (outputStream* st, int index) const; 408 void verify(outputStream* st) const; 409 410 static void verify_tos_state_shift() { 411 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state: 412 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask"); 413 } 414 415 void verify_just_initialized(bool f2_used); 416 void reinitialize(bool f2_used); 417 }; 418 419 420 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache 421 // holds interpreter runtime information for all field access and invoke bytecodes. The cache 422 // is created and initialized before a class is actively used (i.e., initialized), the indivi- 423 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*). 424 425 class ConstantPoolCache: public MetaspaceObj { 426 friend class VMStructs; 427 friend class MetadataFactory; 428 private: 429 // If you add a new field that points to any metaspace object, you 430 // must add this field to ConstantPoolCache::metaspace_pointers_do(). 431 int _length; 432 ConstantPool* _constant_pool; // the corresponding constant pool 433 434 // The following fields need to be modified at runtime, so they cannot be 435 // stored in the ConstantPool, which is read-only. 436 // Array of resolved objects from the constant pool and map from resolved 437 // object index to original constant pool index 438 OopHandle _resolved_references; 439 Array<u2>* _reference_map; 440 // The narrowOop pointer to the archived resolved_references. Set at CDS dump 441 // time when caching java heap object is supported. 442 CDS_JAVA_HEAP_ONLY(narrowOop _archived_references;) 443 444 // Sizing 445 debug_only(friend class ClassVerifier;) 446 447 // Constructor 448 ConstantPoolCache(int length, 449 const intStack& inverse_index_map, 450 const intStack& invokedynamic_inverse_index_map, 451 const intStack& invokedynamic_references_map) : 452 _length(length), 453 _constant_pool(NULL) { 454 CDS_JAVA_HEAP_ONLY(_archived_references = 0;) 455 initialize(inverse_index_map, invokedynamic_inverse_index_map, 456 invokedynamic_references_map); 457 for (int i = 0; i < length; i++) { 458 assert(entry_at(i)->is_f1_null(), "Failed to clear?"); 459 } 460 } 461 462 // Initialization 463 void initialize(const intArray& inverse_index_map, 464 const intArray& invokedynamic_inverse_index_map, 465 const intArray& invokedynamic_references_map); 466 public: 467 static ConstantPoolCache* allocate(ClassLoaderData* loader_data, 468 const intStack& cp_cache_map, 469 const intStack& invokedynamic_cp_cache_map, 470 const intStack& invokedynamic_references_map, TRAPS); 471 bool is_constantPoolCache() const { return true; } 472 473 int length() const { return _length; } 474 void metaspace_pointers_do(MetaspaceClosure* it); 475 MetaspaceObj::Type type() const { return ConstantPoolCacheType; } 476 477 oop archived_references() NOT_CDS_JAVA_HEAP_RETURN_(NULL); 478 void set_archived_references(oop o) NOT_CDS_JAVA_HEAP_RETURN; 479 480 oop resolved_references() { return _resolved_references.resolve(); } 481 void set_resolved_references(OopHandle s) { _resolved_references = s; } 482 Array<u2>* reference_map() const { return _reference_map; } 483 void set_reference_map(Array<u2>* o) { _reference_map = o; } 484 485 // Assembly code support 486 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPoolCache, _resolved_references); } 487 488 // CDS support 489 void remove_unshareable_info(); 490 void verify_just_initialized(); 491 private: 492 void walk_entries_for_initialization(bool check_only); 493 void set_length(int length) { _length = length; } 494 495 static int header_size() { return sizeof(ConstantPoolCache) / wordSize; } 496 static int size(int length) { return align_metadata_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); } 497 public: 498 int size() const { return size(length()); } 499 private: 500 501 // Helpers 502 ConstantPool** constant_pool_addr() { return &_constant_pool; } 503 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); } 504 505 friend class constantPoolCacheKlass; 506 friend class ConstantPoolCacheEntry; 507 508 public: 509 // Accessors 510 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; } 511 ConstantPool* constant_pool() const { return _constant_pool; } 512 // Fetches the entry at the given index. 513 // In either case the index must not be encoded or byte-swapped in any way. 514 ConstantPoolCacheEntry* entry_at(int i) const { 515 assert(0 <= i && i < length(), "index out of bounds"); 516 return base() + i; 517 } 518 519 // Code generation 520 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); } 521 static ByteSize entry_offset(int raw_index) { 522 int index = raw_index; 523 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index); 524 } 525 526 #if INCLUDE_JVMTI 527 // RedefineClasses() API support: 528 // If any entry of this ConstantPoolCache points to any of 529 // old_methods, replace it with the corresponding new_method. 530 // trace_name_printed is set to true if the current call has 531 // printed the klass name so that other routines in the adjust_* 532 // group don't print the klass name. 533 void adjust_method_entries(InstanceKlass* holder, bool* trace_name_printed); 534 bool check_no_old_or_obsolete_entries(); 535 void dump_cache(); 536 #endif // INCLUDE_JVMTI 537 538 // RedefineClasses support 539 DEBUG_ONLY(bool on_stack() { return false; }) 540 void deallocate_contents(ClassLoaderData* data); 541 bool is_klass() const { return false; } 542 543 // Printing 544 void print_on(outputStream* st) const; 545 void print_value_on(outputStream* st) const; 546 547 const char* internal_name() const { return "{constant pool cache}"; } 548 549 // Verify 550 void verify_on(outputStream* st); 551 }; 552 553 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP