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