1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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  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).
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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 "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);
 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);
 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   }
 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);
 163   void set_flags(intx flags)                     { _flags = flags; }
 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   }
 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_local_signature_shift  = 25,  // (M) does the call site have a per-site signature (sig-poly methods)?
 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
 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 an "appendix" item in the
 295   // resolved references array:
 296   Method*      method_if_resolved(const constantPoolHandle& cpool);
 297   oop        appendix_if_resolved(const constantPoolHandle& cpool);
 298 
 299   void set_parameter_size(int value);
 300 
 301   // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
 302   // Returns -1 if neither is valid.
 303   static int bytecode_number(Bytecodes::Code code) {
 304     switch (code) {
 305       case Bytecodes::_getstatic       :    // fall through
 306       case Bytecodes::_getfield        :    // fall through
 307       case Bytecodes::_invokespecial   :    // fall through
 308       case Bytecodes::_invokestatic    :    // fall through
 309       case Bytecodes::_invokehandle    :    // fall through
 310       case Bytecodes::_invokedynamic   :    // fall through
 311       case Bytecodes::_invokeinterface : return 1;
 312       case Bytecodes::_putstatic       :    // fall through
 313       case Bytecodes::_putfield        :    // fall through
 314       case Bytecodes::_invokevirtual   : return 2;
 315       default                          : break;
 316     }
 317     return -1;
 318   }
 319 
 320   // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
 321   bool is_resolved(Bytecodes::Code code) const;
 322 
 323   // Accessors
 324   int indices() const                            { return _indices; }
 325   int indices_ord() const;
 326   int constant_pool_index() const                { return (indices() & cp_index_mask); }
 327   Bytecodes::Code bytecode_1() const;
 328   Bytecodes::Code bytecode_2() const;
 329   Metadata* f1_ord() const;
 330   Method*   f1_as_method() const;
 331   Klass*    f1_as_klass() const;
 332   // Use the accessor f1() to acquire _f1's value. This is needed for
 333   // example in BytecodeInterpreter::run(), where is_f1_null() is
 334   // called to check if an invokedynamic call is resolved. This load
 335   // of _f1 must be ordered with the loads performed by
 336   // cache->main_entry_index().
 337   bool      is_f1_null() const;  // classifies a CPC entry as unbound
 338   int       f2_as_index() const                  { assert(!is_vfinal(), ""); return (int) _f2; }
 339   Method*   f2_as_vfinal_method() const          { assert(is_vfinal(), ""); return (Method*)_f2; }
 340   Method*   f2_as_interface_method() const;
 341   intx flags_ord() const;
 342   int  field_index() const                       { assert(is_field_entry(),  ""); return (_flags & field_index_mask); }
 343   int  parameter_size() const                    { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
 344   bool is_volatile() const                       { return (_flags & (1 << is_volatile_shift))       != 0; }
 345   bool is_final() const                          { return (_flags & (1 << is_final_shift))          != 0; }
 346   bool is_forced_virtual() const                 { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
 347   bool is_vfinal() const                         { return (_flags & (1 << is_vfinal_shift))         != 0; }
 348   bool indy_resolution_failed() const;
 349   bool has_appendix() const;
 350   bool has_local_signature() const;
 351   bool is_method_entry() const                   { return (_flags & (1 << is_field_entry_shift))    == 0; }
 352   bool is_field_entry() const                    { return (_flags & (1 << is_field_entry_shift))    != 0; }
 353   bool is_long() const                           { return flag_state() == ltos; }
 354   bool is_double() const                         { return flag_state() == dtos; }
 355   TosState flag_state() const                    { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
 356                                                    return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
 357   void set_indy_resolution_failed();
 358 
 359   // Code generation support
 360   static WordSize size()                         {
 361     return in_WordSize(align_up((int)sizeof(ConstantPoolCacheEntry), wordSize) / wordSize);
 362   }
 363   static ByteSize size_in_bytes()                { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
 364   static ByteSize indices_offset()               { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
 365   static ByteSize f1_offset()                    { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
 366   static ByteSize f2_offset()                    { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
 367   static ByteSize flags_offset()                 { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
 368 
 369 #if INCLUDE_JVMTI
 370   // RedefineClasses() API support:
 371   // If this ConstantPoolCacheEntry refers to old_method then update it
 372   // to refer to new_method.
 373   // trace_name_printed is set to true if the current call has
 374   // printed the klass name so that other routines in the adjust_*
 375   // group don't print the klass name.
 376   void adjust_method_entry(Method* old_method, Method* new_method,
 377          bool* trace_name_printed);
 378   bool check_no_old_or_obsolete_entries();
 379   Method* get_interesting_method_entry(Klass* k);
 380 #endif // INCLUDE_JVMTI
 381 
 382   // Debugging & Printing
 383   void print (outputStream* st, int index) const;
 384   void verify(outputStream* st) const;
 385 
 386   static void verify_tos_state_shift() {
 387     // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state:
 388     assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask");
 389   }
 390 
 391   void verify_just_initialized(bool f2_used);
 392   void reinitialize(bool f2_used);
 393 };
 394 
 395 
 396 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
 397 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
 398 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
 399 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
 400 
 401 class ConstantPoolCache: public MetaspaceObj {
 402   friend class VMStructs;
 403   friend class MetadataFactory;
 404  private:
 405   // If you add a new field that points to any metaspace object, you
 406   // must add this field to ConstantPoolCache::metaspace_pointers_do().
 407   int             _length;
 408   ConstantPool*   _constant_pool;          // the corresponding constant pool
 409 
 410   // The following fields need to be modified at runtime, so they cannot be
 411   // stored in the ConstantPool, which is read-only.
 412   // Array of resolved objects from the constant pool and map from resolved
 413   // object index to original constant pool index
 414   OopHandle            _resolved_references;
 415   Array<u2>*           _reference_map;
 416   // The narrowOop pointer to the archived resolved_references. Set at CDS dump
 417   // time when caching java heap object is supported.
 418   CDS_JAVA_HEAP_ONLY(narrowOop _archived_references;)
 419 
 420   // Sizing
 421   debug_only(friend class ClassVerifier;)
 422 
 423   // Constructor
 424   ConstantPoolCache(int length,
 425                     const intStack& inverse_index_map,
 426                     const intStack& invokedynamic_inverse_index_map,
 427                     const intStack& invokedynamic_references_map);
 428 
 429   // Initialization
 430   void initialize(const intArray& inverse_index_map,
 431                   const intArray& invokedynamic_inverse_index_map,
 432                   const intArray& invokedynamic_references_map);
 433  public:
 434   static ConstantPoolCache* allocate(ClassLoaderData* loader_data,
 435                                      const intStack& cp_cache_map,
 436                                      const intStack& invokedynamic_cp_cache_map,
 437                                      const intStack& appendix_references_map, TRAPS);
 438   bool is_constantPoolCache() const { return true; }
 439 
 440   int length() const                      { return _length; }
 441   void metaspace_pointers_do(MetaspaceClosure* it);
 442   MetaspaceObj::Type type() const         { return ConstantPoolCacheType; }
 443 
 444   oop  archived_references() NOT_CDS_JAVA_HEAP_RETURN_(NULL);
 445   void set_archived_references(oop o) NOT_CDS_JAVA_HEAP_RETURN;
 446 
 447   inline oop resolved_references();
 448   void set_resolved_references(OopHandle s) { _resolved_references = s; }
 449   Array<u2>* reference_map() const        { return _reference_map; }
 450   void set_reference_map(Array<u2>* o)    { _reference_map = o; }
 451 
 452   // Assembly code support
 453   static int resolved_references_offset_in_bytes() { return offset_of(ConstantPoolCache, _resolved_references); }
 454 
 455   // CDS support
 456   void remove_unshareable_info();
 457   void verify_just_initialized();
 458  private:
 459   void walk_entries_for_initialization(bool check_only);
 460   void set_length(int length)                    { _length = length; }
 461 
 462   static int header_size()                       { return sizeof(ConstantPoolCache) / wordSize; }
 463   static int size(int length)                    { return align_metadata_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
 464  public:
 465   int size() const                               { return size(length()); }
 466  private:
 467 
 468   // Helpers
 469   ConstantPool**        constant_pool_addr()     { return &_constant_pool; }
 470   ConstantPoolCacheEntry* base() const           { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
 471 
 472   friend class constantPoolCacheKlass;
 473   friend class ConstantPoolCacheEntry;
 474 
 475  public:
 476   // Accessors
 477   void set_constant_pool(ConstantPool* pool)   { _constant_pool = pool; }
 478   ConstantPool* constant_pool() const          { return _constant_pool; }
 479   // Fetches the entry at the given index.
 480   // In either case the index must not be encoded or byte-swapped in any way.
 481   ConstantPoolCacheEntry* entry_at(int i) const {
 482     assert(0 <= i && i < length(), "index out of bounds");
 483     return base() + i;
 484   }
 485 
 486   // Code generation
 487   static ByteSize base_offset()                  { return in_ByteSize(sizeof(ConstantPoolCache)); }
 488   static ByteSize entry_offset(int raw_index) {
 489     int index = raw_index;
 490     return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
 491   }
 492 
 493 #if INCLUDE_JVMTI
 494   // RedefineClasses() API support:
 495   // If any entry of this ConstantPoolCache points to any of
 496   // old_methods, replace it with the corresponding new_method.
 497   // trace_name_printed is set to true if the current call has
 498   // printed the klass name so that other routines in the adjust_*
 499   // group don't print the klass name.
 500   void adjust_method_entries(InstanceKlass* holder, bool* trace_name_printed);
 501   bool check_no_old_or_obsolete_entries();
 502   void dump_cache();
 503 #endif // INCLUDE_JVMTI
 504 
 505   // RedefineClasses support
 506   DEBUG_ONLY(bool on_stack() { return false; })
 507   void deallocate_contents(ClassLoaderData* data);
 508   bool is_klass() const { return false; }
 509 
 510   // Printing
 511   void print_on(outputStream* st) const;
 512   void print_value_on(outputStream* st) const;
 513 
 514   const char* internal_name() const { return "{constant pool cache}"; }
 515 
 516   // Verify
 517   void verify_on(outputStream* st);
 518 };
 519 
 520 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP