1 /* 2 * Copyright (c) 1998, 2018, 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 "utilities/align.hpp" 33 #include "utilities/constantTag.hpp" 34 35 class PSPromotionManager; 36 37 // The ConstantPoolCache is not a cache! It is the resolution table that the 38 // interpreter uses to avoid going into the runtime and a way to access resolved 39 // values. 40 41 // A ConstantPoolCacheEntry describes an individual entry of the constant 42 // pool cache. There's 2 principal kinds of entries: field entries for in- 43 // stance & static field access, and method entries for invokes. Some of 44 // the entry layout is shared and looks as follows: 45 // 46 // bit number |31 0| 47 // bit length |-8--|-8--|---16----| 48 // -------------------------------- 49 // _indices [ b2 | b1 | index ] index = constant_pool_index 50 // _f1 [ entry specific ] metadata ptr (method or klass) 51 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr 52 // _flags [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries) 53 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |1 |-3-|----16-----] 54 // _flags [tos|0|F=0|M|A|I|f|0|vf|indy_rf|000|00000|psize] (for method entries) 55 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--] 56 57 // -------------------------------- 58 // 59 // with: 60 // index = original constant pool index 61 // b1 = bytecode 1 62 // b2 = bytecode 2 63 // psize = parameters size (method entries only) 64 // field_index = index into field information in holder InstanceKlass 65 // The index max is 0xffff (max number of fields in constant pool) 66 // and is multiplied by (InstanceKlass::next_offset) when accessing. 67 // tos = TosState 68 // F = the entry is for a field (or F=0 for a method) 69 // A = call site has an appendix argument (loaded from resolved references) 70 // I = interface call is forced virtual (must use a vtable index or vfinal) 71 // f = field or method is final 72 // v = field is volatile 73 // vf = virtual but final (method entries only: is_vfinal()) 74 // indy_rf = call site specifier method resolution failed 75 // 76 // The flags after TosState have the following interpretation: 77 // bit 27: 0 for fields, 1 for methods 78 // f flag true if field is marked final 79 // v flag true if field is volatile (only for fields) 80 // f2 flag true if f2 contains an oop (e.g., virtual final method) 81 // fv flag true if invokeinterface used for method in class Object 82 // 83 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 16 with the 84 // following mapping to the TosState states: 85 // 86 // btos: 0 87 // ztos: 1 88 // ctos: 2 89 // stos: 3 90 // itos: 4 91 // ltos: 5 92 // ftos: 6 93 // dtos: 7 94 // atos: 8 95 // vtos: 9 96 // 97 // Entry specific: field entries: 98 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index 99 // _f1 = field holder (as a java.lang.Class, not a Klass*) 100 // _f2 = field offset in bytes 101 // _flags = field type information, original FieldInfo index in field holder 102 // (field_index section) 103 // 104 // Entry specific: method entries: 105 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section), 106 // original constant pool index 107 // _f1 = Method* for non-virtual calls, unused by virtual calls. 108 // for interface calls, which are essentially virtual but need a klass, 109 // contains Klass* for the corresponding interface. 110 // for invokedynamic and invokehandle, f1 contains the adapter method which 111 // manages the actual call. The appendix is stored in the ConstantPool 112 // resolved_references array. 113 // (upcoming metadata changes will move the appendix to a separate array) 114 // _f2 = vtable/itable index (or final Method*) for virtual calls only, 115 // unused by non-virtual. The is_vfinal flag indicates this is a 116 // method pointer for a final method, not an index. 117 // _flags = method type info (t section), 118 // virtual final bit (vfinal), 119 // parameter size (psize section) 120 // 121 // Note: invokevirtual & invokespecial bytecodes can share the same constant 122 // pool entry and thus the same constant pool cache entry. All invoke 123 // bytecodes but invokevirtual use only _f1 and the corresponding b1 124 // bytecode, while invokevirtual uses only _f2 and the corresponding 125 // b2 bytecode. The value of _flags is shared for both types of entries. 126 // 127 // The fields are volatile so that they are stored in the order written in the 128 // source code. The _indices field with the bytecode must be written last. 129 130 class CallInfo; 131 132 class ConstantPoolCacheEntry { 133 friend class VMStructs; 134 friend class constantPoolCacheKlass; 135 friend class ConstantPool; 136 friend class InterpreterRuntime; 137 138 private: 139 volatile intx _indices; // constant pool index & rewrite bytecodes 140 Metadata* volatile _f1; // entry specific metadata field 141 volatile intx _f2; // entry specific int/metadata field 142 volatile intx _flags; // flags 143 144 145 void set_bytecode_1(Bytecodes::Code code); 146 void set_bytecode_2(Bytecodes::Code code); set_f1(Metadata * f1)147 void set_f1(Metadata* f1) { 148 Metadata* existing_f1 = _f1; // read once 149 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change"); 150 _f1 = f1; 151 } 152 void release_set_f1(Metadata* f1); set_f2(intx f2)153 void set_f2(intx f2) { 154 intx existing_f2 = _f2; // read once 155 assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change"); 156 _f2 = f2; 157 } set_f2_as_vfinal_method(Method * f2)158 void set_f2_as_vfinal_method(Method* f2) { 159 assert(is_vfinal(), "flags must be set"); 160 set_f2((intx)f2); 161 } 162 int make_flags(TosState state, int option_bits, int field_index_or_method_params); set_flags(intx flags)163 void set_flags(intx flags) { _flags = flags; } set_field_flags(TosState field_type,int option_bits,int field_index)164 void set_field_flags(TosState field_type, int option_bits, int field_index) { 165 assert((field_index & field_index_mask) == field_index, "field_index in range"); 166 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index)); 167 } set_method_flags(TosState return_type,int option_bits,int method_params)168 void set_method_flags(TosState return_type, int option_bits, int method_params) { 169 assert((method_params & parameter_size_mask) == method_params, "method_params in range"); 170 set_flags(make_flags(return_type, option_bits, method_params)); 171 } 172 173 public: 174 // specific bit definitions for the flags field: 175 // (Note: the interpreter must use these definitions to access the CP cache.) 176 enum { 177 // high order bits are the TosState corresponding to field type or method return type 178 tos_state_bits = 4, 179 tos_state_mask = right_n_bits(tos_state_bits), 180 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below 181 // misc. option bits; can be any bit position in [16..27] 182 is_field_entry_shift = 26, // (F) is it a field or a method? 183 has_method_type_shift = 25, // (M) does the call site have a MethodType? 184 has_appendix_shift = 24, // (A) does the call site have an appendix argument? 185 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode? 186 is_final_shift = 22, // (f) is the field or method final? 187 is_volatile_shift = 21, // (v) is the field volatile? 188 is_vfinal_shift = 20, // (vf) did the call resolve to a final method? 189 indy_resolution_failed_shift= 19, // (indy_rf) did call site specifier resolution fail ? 190 // low order bits give field index (for FieldInfo) or method parameter size: 191 field_index_bits = 16, 192 field_index_mask = right_n_bits(field_index_bits), 193 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255 194 parameter_size_mask = right_n_bits(parameter_size_bits), 195 option_bits_mask = ~(((~0u) << tos_state_shift) | (field_index_mask | parameter_size_mask)) 196 }; 197 198 // specific bit definitions for the indices field: 199 enum { 200 cp_index_bits = 2*BitsPerByte, 201 cp_index_mask = right_n_bits(cp_index_bits), 202 bytecode_1_shift = cp_index_bits, 203 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF 204 bytecode_2_shift = cp_index_bits + BitsPerByte, 205 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF 206 }; 207 208 209 // Initialization 210 void initialize_entry(int original_index); // initialize primary entry initialize_resolved_reference_index(int ref_index)211 void initialize_resolved_reference_index(int ref_index) { 212 assert(_f2 == 0, "set once"); // note: ref_index might be zero also 213 _f2 = ref_index; 214 } 215 216 void set_field( // sets entry to resolved field state 217 Bytecodes::Code get_code, // the bytecode used for reading the field 218 Bytecodes::Code put_code, // the bytecode used for writing the field 219 Klass* field_holder, // the object/klass holding the field 220 int orig_field_index, // the original field index in the field holder 221 int field_offset, // the field offset in words in the field holder 222 TosState field_type, // the (machine) field type 223 bool is_final, // the field is final 224 bool is_volatile, // the field is volatile 225 Klass* root_klass // needed by the GC to dirty the klass 226 ); 227 228 private: 229 void set_direct_or_vtable_call( 230 Bytecodes::Code invoke_code, // the bytecode used for invoking the method 231 const methodHandle& method, // the method/prototype if any (NULL, otherwise) 232 int vtable_index, // the vtable index if any, else negative 233 bool sender_is_interface 234 ); 235 236 public: 237 void set_direct_call( // sets entry to exact concrete method entry 238 Bytecodes::Code invoke_code, // the bytecode used for invoking the method 239 const methodHandle& method, // the method to call 240 bool sender_is_interface 241 ); 242 243 void set_vtable_call( // sets entry to vtable index 244 Bytecodes::Code invoke_code, // the bytecode used for invoking the method 245 const methodHandle& method, // resolved method which declares the vtable index 246 int vtable_index // the vtable index 247 ); 248 249 void set_itable_call( 250 Bytecodes::Code invoke_code, // the bytecode used; must be invokeinterface 251 Klass* referenced_klass, // the referenced klass in the InterfaceMethodref 252 const methodHandle& method, // the resolved interface method 253 int itable_index // index into itable for the method 254 ); 255 256 void set_method_handle( 257 const constantPoolHandle& cpool, // holding constant pool (required for locking) 258 const CallInfo &call_info // Call link information 259 ); 260 261 void set_dynamic_call( 262 const constantPoolHandle& cpool, // holding constant pool (required for locking) 263 const CallInfo &call_info // Call link information 264 ); 265 266 // Common code for invokedynamic and MH invocations. 267 268 // The "appendix" is an optional call-site-specific parameter which is 269 // pushed by the JVM at the end of the argument list. This argument may 270 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic 271 // instruction. However, its exact type and use depends on the Java upcall, 272 // which simply returns a compiled LambdaForm along with any reference 273 // that LambdaForm needs to complete the call. If the upcall returns a 274 // null appendix, the argument is not passed at all. 275 // 276 // The appendix is *not* represented in the signature of the symbolic 277 // reference for the call site, but (if present) it *is* represented in 278 // the Method* bound to the site. This means that static and dynamic 279 // resolution logic needs to make slightly different assessments about the 280 // number and types of arguments. 281 void set_method_handle_common( 282 const constantPoolHandle& cpool, // holding constant pool (required for locking) 283 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic 284 const CallInfo &call_info // Call link information 285 ); 286 287 // Return TRUE if resolution failed and this thread got to record the failure 288 // status. Return FALSE if another thread succeeded or failed in resolving 289 // the method and recorded the success or failure before this thread had a 290 // chance to record its failure. 291 bool save_and_throw_indy_exc(const constantPoolHandle& cpool, int cpool_index, 292 int index, constantTag tag, TRAPS); 293 294 // invokedynamic and invokehandle call sites have two entries in the 295 // resolved references array: 296 // appendix (at index+0) 297 // MethodType (at index+1) 298 enum { 299 _indy_resolved_references_appendix_offset = 0, 300 _indy_resolved_references_method_type_offset = 1, 301 _indy_resolved_references_entries 302 }; 303 304 Method* method_if_resolved(const constantPoolHandle& cpool); 305 oop appendix_if_resolved(const constantPoolHandle& cpool); 306 oop method_type_if_resolved(const constantPoolHandle& cpool); 307 308 void set_parameter_size(int value); 309 310 // Which bytecode number (1 or 2) in the index field is valid for this bytecode? 311 // Returns -1 if neither is valid. bytecode_number(Bytecodes::Code code)312 static int bytecode_number(Bytecodes::Code code) { 313 switch (code) { 314 case Bytecodes::_getstatic : // fall through 315 case Bytecodes::_getfield : // fall through 316 case Bytecodes::_invokespecial : // fall through 317 case Bytecodes::_invokestatic : // fall through 318 case Bytecodes::_invokehandle : // fall through 319 case Bytecodes::_invokedynamic : // fall through 320 case Bytecodes::_invokeinterface : return 1; 321 case Bytecodes::_putstatic : // fall through 322 case Bytecodes::_putfield : // fall through 323 case Bytecodes::_invokevirtual : return 2; 324 default : break; 325 } 326 return -1; 327 } 328 329 // Has this bytecode been resolved? Only valid for invokes and get/put field/static. 330 bool is_resolved(Bytecodes::Code code) const; 331 332 // Accessors indices() const333 int indices() const { return _indices; } 334 int indices_ord() const; constant_pool_index() const335 int constant_pool_index() const { return (indices() & cp_index_mask); } 336 Bytecodes::Code bytecode_1() const; 337 Bytecodes::Code bytecode_2() const; 338 Metadata* f1_ord() const; 339 Method* f1_as_method() const; 340 Klass* f1_as_klass() const; 341 // Use the accessor f1() to acquire _f1's value. This is needed for 342 // example in BytecodeInterpreter::run(), where is_f1_null() is 343 // called to check if an invokedynamic call is resolved. This load 344 // of _f1 must be ordered with the loads performed by 345 // cache->main_entry_index(). 346 bool is_f1_null() const; // classifies a CPC entry as unbound f2_as_index() const347 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; } f2_as_vfinal_method() const348 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; } 349 Method* f2_as_interface_method() const; 350 intx flags_ord() const; field_index() const351 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); } parameter_size() const352 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); } is_volatile() const353 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; } is_final() const354 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; } is_forced_virtual() const355 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; } is_vfinal() const356 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; } 357 bool indy_resolution_failed() const; 358 bool has_appendix() const; 359 bool has_method_type() const; is_method_entry() const360 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; } is_field_entry() const361 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; } is_long() const362 bool is_long() const { return flag_state() == ltos; } is_double() const363 bool is_double() const { return flag_state() == dtos; } flag_state() const364 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, ""); 365 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); } 366 void set_indy_resolution_failed(); 367 368 // Code generation support size()369 static WordSize size() { 370 return in_WordSize(align_up((int)sizeof(ConstantPoolCacheEntry), wordSize) / wordSize); 371 } size_in_bytes()372 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); } indices_offset()373 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); } f1_offset()374 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); } f2_offset()375 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); } flags_offset()376 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); } 377 378 #if INCLUDE_JVMTI 379 // RedefineClasses() API support: 380 // If this ConstantPoolCacheEntry refers to old_method then update it 381 // to refer to new_method. 382 // trace_name_printed is set to true if the current call has 383 // printed the klass name so that other routines in the adjust_* 384 // group don't print the klass name. 385 void adjust_method_entry(Method* old_method, Method* new_method, 386 bool* trace_name_printed); 387 bool check_no_old_or_obsolete_entries(); 388 Method* get_interesting_method_entry(Klass* k); 389 #endif // INCLUDE_JVMTI 390 391 // Debugging & Printing 392 void print (outputStream* st, int index) const; 393 void verify(outputStream* st) const; 394 verify_tos_state_shift()395 static void verify_tos_state_shift() { 396 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state: 397 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask"); 398 } 399 400 void verify_just_initialized(bool f2_used); 401 void reinitialize(bool f2_used); 402 }; 403 404 405 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache 406 // holds interpreter runtime information for all field access and invoke bytecodes. The cache 407 // is created and initialized before a class is actively used (i.e., initialized), the indivi- 408 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*). 409 410 class ConstantPoolCache: public MetaspaceObj { 411 friend class VMStructs; 412 friend class MetadataFactory; 413 private: 414 // If you add a new field that points to any metaspace object, you 415 // must add this field to ConstantPoolCache::metaspace_pointers_do(). 416 int _length; 417 ConstantPool* _constant_pool; // the corresponding constant pool 418 419 // The following fields need to be modified at runtime, so they cannot be 420 // stored in the ConstantPool, which is read-only. 421 // Array of resolved objects from the constant pool and map from resolved 422 // object index to original constant pool index 423 OopHandle _resolved_references; 424 Array<u2>* _reference_map; 425 // The narrowOop pointer to the archived resolved_references. Set at CDS dump 426 // time when caching java heap object is supported. 427 CDS_JAVA_HEAP_ONLY(narrowOop _archived_references;) 428 429 // Sizing 430 debug_only(friend class ClassVerifier;) 431 432 // Constructor 433 ConstantPoolCache(int length, 434 const intStack& inverse_index_map, 435 const intStack& invokedynamic_inverse_index_map, 436 const intStack& invokedynamic_references_map); 437 438 // Initialization 439 void initialize(const intArray& inverse_index_map, 440 const intArray& invokedynamic_inverse_index_map, 441 const intArray& invokedynamic_references_map); 442 public: 443 static ConstantPoolCache* allocate(ClassLoaderData* loader_data, 444 const intStack& cp_cache_map, 445 const intStack& invokedynamic_cp_cache_map, 446 const intStack& invokedynamic_references_map, TRAPS); is_constantPoolCache() const447 bool is_constantPoolCache() const { return true; } 448 length() const449 int length() const { return _length; } 450 void metaspace_pointers_do(MetaspaceClosure* it); type() const451 MetaspaceObj::Type type() const { return ConstantPoolCacheType; } 452 453 oop archived_references() NOT_CDS_JAVA_HEAP_RETURN_(NULL); 454 void set_archived_references(oop o) NOT_CDS_JAVA_HEAP_RETURN; 455 456 inline oop resolved_references(); set_resolved_references(OopHandle s)457 void set_resolved_references(OopHandle s) { _resolved_references = s; } reference_map() const458 Array<u2>* reference_map() const { return _reference_map; } set_reference_map(Array<u2> * o)459 void set_reference_map(Array<u2>* o) { _reference_map = o; } 460 461 // Assembly code support resolved_references_offset_in_bytes()462 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPoolCache, _resolved_references); } 463 464 // CDS support 465 void remove_unshareable_info(); 466 void verify_just_initialized(); 467 private: 468 void walk_entries_for_initialization(bool check_only); set_length(int length)469 void set_length(int length) { _length = length; } 470 header_size()471 static int header_size() { return sizeof(ConstantPoolCache) / wordSize; } size(int length)472 static int size(int length) { return align_metadata_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); } 473 public: size() const474 int size() const { return size(length()); } 475 private: 476 477 // Helpers constant_pool_addr()478 ConstantPool** constant_pool_addr() { return &_constant_pool; } base() const479 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); } 480 481 friend class constantPoolCacheKlass; 482 friend class ConstantPoolCacheEntry; 483 484 public: 485 // Accessors set_constant_pool(ConstantPool * pool)486 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; } constant_pool() const487 ConstantPool* constant_pool() const { return _constant_pool; } 488 // Fetches the entry at the given index. 489 // In either case the index must not be encoded or byte-swapped in any way. entry_at(int i) const490 ConstantPoolCacheEntry* entry_at(int i) const { 491 assert(0 <= i && i < length(), "index out of bounds"); 492 return base() + i; 493 } 494 495 // Code generation base_offset()496 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); } entry_offset(int raw_index)497 static ByteSize entry_offset(int raw_index) { 498 int index = raw_index; 499 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index); 500 } 501 502 #if INCLUDE_JVMTI 503 // RedefineClasses() API support: 504 // If any entry of this ConstantPoolCache points to any of 505 // old_methods, replace it with the corresponding new_method. 506 // trace_name_printed is set to true if the current call has 507 // printed the klass name so that other routines in the adjust_* 508 // group don't print the klass name. 509 void adjust_method_entries(InstanceKlass* holder, bool* trace_name_printed); 510 bool check_no_old_or_obsolete_entries(); 511 void dump_cache(); 512 #endif // INCLUDE_JVMTI 513 514 // RedefineClasses support 515 DEBUG_ONLY(bool on_stack() { return false; }) 516 void deallocate_contents(ClassLoaderData* data); is_klass() const517 bool is_klass() const { return false; } 518 519 // Printing 520 void print_on(outputStream* st) const; 521 void print_value_on(outputStream* st) const; 522 internal_name() const523 const char* internal_name() const { return "{constant pool cache}"; } 524 525 // Verify 526 void verify_on(outputStream* st); 527 }; 528 529 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP 530