jdk8-mips64-public/hotspot: src/share/vm/oops/cpCacheOop.hpp@0fbdb4381b99 (annotated)

src/share/vm/oops/cpCacheOop.hpp@0fbdb4381b99 (annotated)

src/share/vm/oops/cpCacheOop.hpp

Mon, 09 Mar 2009 13:28:46 -0700

author: xdono
date: Mon, 09 Mar 2009 13:28:46 -0700
changeset 1014: 0fbdb4381b99
parent 977: 9a25e0c45327
child 1161: be93aad57795
permissions: -rw-r--r--

6814575: Update copyright year
Summary: Update copyright for files that have been modified in 2009, up to 03/09
Reviewed-by: katleman, tbell, ohair

 /*
  * Copyright 1998-2009 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 // A ConstantPoolCacheEntry describes an individual entry of the constant
 // pool cache. There's 2 principal kinds of entries: field entries for in-
 // stance & static field access, and method entries for invokes. Some of
 // the entry layout is shared and looks as follows:
 //
 // bit number |31                0|
 // bit length |-8--|-8--|---16----|
 // --------------------------------
 // _indices   [ b2 | b1 |  index  ]
 // _f1        [  entry specific   ]
 // _f2        [  entry specific   ]
 // _flags     [t|f|vf|v|m|h|unused|field_index] (for field entries)
 // bit length |4|1|1 |1|1|0|---7--|----16-----]
 // _flags     [t|f|vf|v|m|h|unused|eidx|psze] (for method entries)
 // bit length |4|1|1 |1|1|1|---7--|-8--|-8--]
 // --------------------------------
 //
 // with:
 // index  = original constant pool index
 // b1     = bytecode 1
 // b2     = bytecode 2
 // psze   = parameters size (method entries only)
 // eidx   = interpreter entry index (method entries only)
 // field_index = index into field information in holder instanceKlass
 //          The index max is 0xffff (max number of fields in constant pool)
 //          and is multiplied by (instanceKlass::next_offset) when accessing.
 // t      = TosState (see below)
 // f      = field is marked final (see below)
 // vf     = virtual, final (method entries only : is_vfinal())
 // v      = field is volatile (see below)
 // m      = invokeinterface used for method in class Object (see below)
 // h      = RedefineClasses/Hotswap bit (see below)
 //
 // The flags after TosState have the following interpretation:
 // bit 27: f flag  true if field is marked final
 // bit 26: vf flag true if virtual final method
 // bit 25: v flag true if field is volatile (only for fields)
 // bit 24: m flag true if invokeinterface used for method in class Object
 // bit 23: 0 for fields, 1 for methods
 //
 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the
 // following mapping to the TosState states:
 //
 // btos: 0
 // ctos: 1
 // stos: 2
 // itos: 3
 // ltos: 4
 // ftos: 5
 // dtos: 6
 // atos: 7
 // vtos: 8
 //
 // Entry specific: field entries:
 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index
 // _f1      = field holder
 // _f2      = field offset in words
 // _flags   = field type information, original field index in field holder
 //            (field_index section)
 //
 // Entry specific: method entries:
 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section),
 //            original constant pool index
 // _f1      = method for all but virtual calls, unused by virtual calls
 //            (note: for interface calls, which are essentially virtual,
 //             contains klassOop for the corresponding interface.
 // _f2      = method/vtable index for virtual calls only, unused by all other
 //            calls.  The vf flag indicates this is a method pointer not an
 //            index.
 // _flags   = field type info (f section),
 //            virtual final entry (vf),
 //            interpreter entry index (eidx section),
 //            parameter size (psze section)
 //
 // Note: invokevirtual & invokespecial bytecodes can share the same constant
 //       pool entry and thus the same constant pool cache entry. All invoke
 //       bytecodes but invokevirtual use only _f1 and the corresponding b1
 //       bytecode, while invokevirtual uses only _f2 and the corresponding
 //       b2 bytecode.  The value of _flags is shared for both types of entries.
 //
 // The fields are volatile so that they are stored in the order written in the
 // source code.  The _indices field with the bytecode must be written last.
 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
  private:
   volatile intx     _indices;  // constant pool index & rewrite bytecodes
   volatile oop      _f1;       // entry specific oop field
   volatile intx     _f2;       // entry specific int/oop field
   volatile intx     _flags;    // flags
 #ifdef ASSERT
   bool same_methodOop(oop cur_f1, oop f1);
 #endif
   void set_bytecode_1(Bytecodes::Code code);
   void set_bytecode_2(Bytecodes::Code code);
   void set_f1(oop f1)                            {
     oop existing_f1 = _f1; // read once
     assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
     oop_store(&_f1, f1);
   }
   void set_f2(intx f2)                           { assert(_f2 == 0    || _f2 == f2, "illegal field change"); _f2 = f2; }
   int as_flags(TosState state, bool is_final, bool is_vfinal, bool is_volatile,
                bool is_method_interface, bool is_method);
   void set_flags(intx flags)                     { _flags = flags; }
  public:
   // specific bit values in flag field
   // Note: the interpreter knows this layout!
   enum FlagBitValues {
     hotSwapBit    = 23,
     methodInterface = 24,
     volatileField = 25,
     vfinalMethod  = 26,
     finalField    = 27
   };
   enum { field_index_mask = 0xFFFF };
   // start of type bits in flags
   // Note: the interpreter knows this layout!
   enum FlagValues {
     tosBits      = 28
   };
   // Initialization
   void set_initial_state(int index);             // sets entry to initial state
   void set_field(                                // sets entry to resolved field state
     Bytecodes::Code get_code,                    // the bytecode used for reading the field
     Bytecodes::Code put_code,                    // the bytecode used for writing the field
     KlassHandle     field_holder,                // the object/klass holding the field
     int             orig_field_index,            // the original field index in the field holder
     int             field_offset,                // the field offset in words in the field holder
     TosState        field_type,                  // the (machine) field type
     bool            is_final,                     // the field is final
     bool            is_volatile                  // the field is volatile
   );
   void set_method(                               // sets entry to resolved method entry
     Bytecodes::Code invoke_code,                 // the bytecode used for invoking the method
     methodHandle    method,                      // the method/prototype if any (NULL, otherwise)
     int             vtable_index                 // the vtable index if any, else negative
   );
   void set_interface_call(
     methodHandle method,                         // Resolved method
     int index                                    // Method index into interface
   );
   void set_parameter_size(int value) {
     assert(parameter_size() == 0 || parameter_size() == value,
            "size must not change");
     // Setting the parameter size by itself is only safe if the
     // current value of _flags is 0, otherwise another thread may have
     // updated it and we don't want to overwrite that value.  Don't
     // bother trying to update it once it's nonzero but always make
     // sure that the final parameter size agrees with what was passed.
     if (_flags == 0) {
       Atomic::cmpxchg_ptr((value & 0xFF), &_flags, 0);
     }
     guarantee(parameter_size() == value, "size must not change");
   }
   // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
   // Returns -1 if neither is valid.
   static int bytecode_number(Bytecodes::Code code) {
     switch (code) {
       case Bytecodes::_getstatic       :    // fall through
       case Bytecodes::_getfield        :    // fall through
       case Bytecodes::_invokespecial   :    // fall through
       case Bytecodes::_invokestatic    :    // fall through
       case Bytecodes::_invokeinterface : return 1;
       case Bytecodes::_putstatic       :    // fall through
       case Bytecodes::_putfield        :    // fall through
       case Bytecodes::_invokevirtual   : return 2;
       default                          : break;
     }
     return -1;
   }
   // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
   bool is_resolved(Bytecodes::Code code) const {
     switch (bytecode_number(code)) {
       case 1:  return (bytecode_1() == code);
       case 2:  return (bytecode_2() == code);
     }
     return false;      // default: not resolved
   }
   // Accessors
   int constant_pool_index() const                { return _indices & 0xFFFF; }
   Bytecodes::Code bytecode_1() const             { return Bytecodes::cast((_indices >> 16) & 0xFF); }
   Bytecodes::Code bytecode_2() const             { return Bytecodes::cast((_indices >> 24) & 0xFF); }
   volatile oop  f1() const                       { return _f1; }
   intx f2() const                                { return _f2; }
   int  field_index() const;
   int  parameter_size() const                    { return _flags & 0xFF; }
   bool is_vfinal() const                         { return ((_flags & (1 << vfinalMethod)) == (1 << vfinalMethod)); }
   bool is_volatile() const                       { return ((_flags & (1 << volatileField)) == (1 << volatileField)); }
   bool is_methodInterface() const                { return ((_flags & (1 << methodInterface)) == (1 << methodInterface)); }
   bool is_byte() const                           { return (((uintx) _flags >> tosBits) == btos); }
   bool is_char() const                           { return (((uintx) _flags >> tosBits) == ctos); }
   bool is_short() const                          { return (((uintx) _flags >> tosBits) == stos); }
   bool is_int() const                            { return (((uintx) _flags >> tosBits) == itos); }
   bool is_long() const                           { return (((uintx) _flags >> tosBits) == ltos); }
   bool is_float() const                          { return (((uintx) _flags >> tosBits) == ftos); }
   bool is_double() const                         { return (((uintx) _flags >> tosBits) == dtos); }
   bool is_object() const                         { return (((uintx) _flags >> tosBits) == atos); }
   TosState flag_state() const                    { assert( ( (_flags >> tosBits) & 0x0F ) < number_of_states, "Invalid state in as_flags");
                                                    return (TosState)((_flags >> tosBits) & 0x0F); }
   // Code generation support
   static WordSize size()                         { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); }
   static ByteSize indices_offset()               { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
   static ByteSize f1_offset()                    { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
   static ByteSize f2_offset()                    { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
   static ByteSize flags_offset()                 { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
   // GC Support
   void oops_do(void f(oop*));
   void oop_iterate(OopClosure* blk);
   void oop_iterate_m(OopClosure* blk, MemRegion mr);
   void follow_contents();
   void adjust_pointers();
 #ifndef SERIALGC
   // Parallel Old
   void follow_contents(ParCompactionManager* cm);
 #endif // SERIALGC
   void update_pointers();
   void update_pointers(HeapWord* beg_addr, HeapWord* end_addr);
   // RedefineClasses() API support:
   // If this constantPoolCacheEntry refers to old_method then update it
   // to refer to new_method.
   // trace_name_printed is set to true if the current call has
   // printed the klass name so that other routines in the adjust_*
   // group don't print the klass name.
   bool adjust_method_entry(methodOop old_method, methodOop new_method,
          bool * trace_name_printed);
   bool is_interesting_method_entry(klassOop k);
   bool is_field_entry() const                    { return (_flags & (1 << hotSwapBit)) == 0; }
   bool is_method_entry() const                   { return (_flags & (1 << hotSwapBit)) != 0; }
   // Debugging & Printing
   void print (outputStream* st, int index) const;
   void verify(outputStream* st) const;
   static void verify_tosBits() {
     assert(tosBits == 28, "interpreter now assumes tosBits is 28");
   }
 };
 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
 class constantPoolCacheOopDesc: public oopDesc {
   friend class VMStructs;
  private:
   int             _length;
   constantPoolOop _constant_pool;                // the corresponding constant pool
   // If true, safe for concurrent GC processing,
   // Set unconditionally in constantPoolCacheKlass::allocate()
   volatile bool        _is_conc_safe;
   // Sizing
   debug_only(friend class ClassVerifier;)
   int length() const                             { return _length; }
   void set_length(int length)                    { _length = length; }
   static int header_size()                       { return sizeof(constantPoolCacheOopDesc) / HeapWordSize; }
   static int object_size(int length)             { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
   int object_size()                              { return object_size(length()); }
   // Helpers
   constantPoolOop*        constant_pool_addr()   { return &_constant_pool; }
   ConstantPoolCacheEntry* base() const           { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
   friend class constantPoolCacheKlass;
  public:
   // Initialization
   void initialize(intArray& inverse_index_map);
   // Accessors
   void set_constant_pool(constantPoolOop pool)   { oop_store_without_check((oop*)&_constant_pool, (oop)pool); }
   constantPoolOop constant_pool() const          { return _constant_pool; }
   ConstantPoolCacheEntry* entry_at(int i) const  { assert(0 <= i && i < length(), "index out of bounds"); return base() + i; }
   // GC support
   // If the _length field has not been set, the size of the
   // constantPoolCache cannot be correctly calculated.
   bool is_conc_safe()                            { return _is_conc_safe; }
   void set_is_conc_safe(bool v)                  { _is_conc_safe = v; }
   // Code generation
   static ByteSize base_offset()                  { return in_ByteSize(sizeof(constantPoolCacheOopDesc)); }
   // RedefineClasses() API support:
   // If any entry of this constantPoolCache points to any of
   // old_methods, replace it with the corresponding new_method.
   // trace_name_printed is set to true if the current call has
   // printed the klass name so that other routines in the adjust_*
   // group don't print the klass name.
   void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
                              int methods_length, bool * trace_name_printed);
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/cpCacheOop.hpp@0fbdb4381b99 (annotated)

src/share/vm/oops/cpCacheOop.hpp