/*

 * Copyright 1997-2009 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.

 *

 */

// Implementation of all inlined member functions defined in oop.hpp

// We need a separate file to avoid circular references

inline void oopDesc::release_set_mark(markOop m) {

  OrderAccess::release_store_ptr(&_mark, m);

}

inline markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) {

  return (markOop) Atomic::cmpxchg_ptr(new_mark, &_mark, old_mark);

}

inline klassOop oopDesc::klass() const {

  if (UseCompressedOops) {

    return (klassOop)decode_heap_oop_not_null(_metadata._compressed_klass);

  } else {

    return _metadata._klass;

  }

}

inline klassOop oopDesc::klass_or_null() const volatile {

  // can be NULL in CMS

  if (UseCompressedOops) {

    return (klassOop)decode_heap_oop(_metadata._compressed_klass);

  } else {

    return _metadata._klass;

  }

}

inline int oopDesc::klass_gap_offset_in_bytes() {

  assert(UseCompressedOops, "only applicable to compressed headers");

  return oopDesc::klass_offset_in_bytes() + sizeof(narrowOop);

}

inline oop* oopDesc::klass_addr() {

  // Only used internally and with CMS and will not work with

  // UseCompressedOops

  assert(!UseCompressedOops, "only supported with uncompressed oops");

  return (oop*) &_metadata._klass;

}

inline narrowOop* oopDesc::compressed_klass_addr() {

  assert(UseCompressedOops, "only called by compressed oops");

  return (narrowOop*) &_metadata._compressed_klass;

}

inline void oopDesc::set_klass(klassOop k) {

  // since klasses are promoted no store check is needed

  assert(Universe::is_bootstrapping() || k != NULL, "must be a real klassOop");

  assert(Universe::is_bootstrapping() || k->is_klass(), "not a klassOop");

  if (UseCompressedOops) {

    oop_store_without_check(compressed_klass_addr(), (oop)k);

  } else {

    oop_store_without_check(klass_addr(), (oop) k);

  }

}

inline int oopDesc::klass_gap() const {

  return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes());

}

inline void oopDesc::set_klass_gap(int v) {

  if (UseCompressedOops) {

    *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v;

  }

}

inline void oopDesc::set_klass_to_list_ptr(oop k) {

  // This is only to be used during GC, for from-space objects, so no

  // barrier is needed.

  if (UseCompressedOops) {

    _metadata._compressed_klass = encode_heap_oop(k);  // may be null (parnew overflow handling)

  } else {

    _metadata._klass = (klassOop)k;

  }

}

inline void   oopDesc::init_mark()                 { set_mark(markOopDesc::prototype_for_object(this)); }

inline Klass* oopDesc::blueprint()           const { return klass()->klass_part(); }

inline bool oopDesc::is_a(klassOop k)        const { return blueprint()->is_subtype_of(k); }

inline bool oopDesc::is_instance()           const { return blueprint()->oop_is_instance(); }

inline bool oopDesc::is_instanceRef()        const { return blueprint()->oop_is_instanceRef(); }

inline bool oopDesc::is_array()              const { return blueprint()->oop_is_array(); }

inline bool oopDesc::is_objArray()           const { return blueprint()->oop_is_objArray(); }

inline bool oopDesc::is_typeArray()          const { return blueprint()->oop_is_typeArray(); }

inline bool oopDesc::is_javaArray()          const { return blueprint()->oop_is_javaArray(); }

inline bool oopDesc::is_symbol()             const { return blueprint()->oop_is_symbol(); }

inline bool oopDesc::is_klass()              const { return blueprint()->oop_is_klass(); }

inline bool oopDesc::is_thread()             const { return blueprint()->oop_is_thread(); }

inline bool oopDesc::is_method()             const { return blueprint()->oop_is_method(); }

inline bool oopDesc::is_constMethod()        const { return blueprint()->oop_is_constMethod(); }

inline bool oopDesc::is_methodData()         const { return blueprint()->oop_is_methodData(); }

inline bool oopDesc::is_constantPool()       const { return blueprint()->oop_is_constantPool(); }

inline bool oopDesc::is_constantPoolCache()  const { return blueprint()->oop_is_constantPoolCache(); }

inline bool oopDesc::is_compiledICHolder()   const { return blueprint()->oop_is_compiledICHolder(); }

inline void*     oopDesc::field_base(int offset)        const { return (void*)&((char*)this)[offset]; }

template <class T> inline T* oopDesc::obj_field_addr(int offset) const { return (T*)field_base(offset); }

inline jbyte*    oopDesc::byte_field_addr(int offset)   const { return (jbyte*)   field_base(offset); }

inline jchar*    oopDesc::char_field_addr(int offset)   const { return (jchar*)   field_base(offset); }

inline jboolean* oopDesc::bool_field_addr(int offset)   const { return (jboolean*)field_base(offset); }

inline jint*     oopDesc::int_field_addr(int offset)    const { return (jint*)    field_base(offset); }

inline jshort*   oopDesc::short_field_addr(int offset)  const { return (jshort*)  field_base(offset); }

inline jlong*    oopDesc::long_field_addr(int offset)   const { return (jlong*)   field_base(offset); }

inline jfloat*   oopDesc::float_field_addr(int offset)  const { return (jfloat*)  field_base(offset); }

inline jdouble*  oopDesc::double_field_addr(int offset) const { return (jdouble*) field_base(offset); }

inline address*  oopDesc::address_field_addr(int offset) const { return (address*) field_base(offset); }

// Functions for getting and setting oops within instance objects.

// If the oops are compressed, the type passed to these overloaded functions

// is narrowOop.  All functions are overloaded so they can be called by

// template functions without conditionals (the compiler instantiates via

// the right type and inlines the appopriate code).

inline bool oopDesc::is_null(oop obj)       { return obj == NULL; }

inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; }

// Algorithm for encoding and decoding oops from 64 bit pointers to 32 bit

// offset from the heap base.  Saving the check for null can save instructions

// in inner GC loops so these are separated.

inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) {

  assert(!is_null(v), "oop value can never be zero");

  address base = Universe::narrow_oop_base();

  int    shift = Universe::narrow_oop_shift();

  uint64_t  pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));

  assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");

  uint64_t result = pd >> shift;

  assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");

  return (narrowOop)result;

}

inline narrowOop oopDesc::encode_heap_oop(oop v) {

  return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v);

}

inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) {

  assert(!is_null(v), "narrow oop value can never be zero");

  address base = Universe::narrow_oop_base();

  int    shift = Universe::narrow_oop_shift();

  return (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift));

}

inline oop oopDesc::decode_heap_oop(narrowOop v) {

  return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v);

}

inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; }

inline oop oopDesc::decode_heap_oop(oop v)  { return v; }

// Load an oop out of the Java heap as is without decoding.

// Called by GC to check for null before decoding.

inline oop       oopDesc::load_heap_oop(oop* p)          { return *p; }

inline narrowOop oopDesc::load_heap_oop(narrowOop* p)    { return *p; }

// Load and decode an oop out of the Java heap into a wide oop.

inline oop oopDesc::load_decode_heap_oop_not_null(oop* p)       { return *p; }

inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) {

  return decode_heap_oop_not_null(*p);

}

// Load and decode an oop out of the heap accepting null

inline oop oopDesc::load_decode_heap_oop(oop* p) { return *p; }

inline oop oopDesc::load_decode_heap_oop(narrowOop* p) {

  return decode_heap_oop(*p);

}

// Store already encoded heap oop into the heap.

inline void oopDesc::store_heap_oop(oop* p, oop v)                 { *p = v; }

inline void oopDesc::store_heap_oop(narrowOop* p, narrowOop v)     { *p = v; }

// Encode and store a heap oop.

inline void oopDesc::encode_store_heap_oop_not_null(narrowOop* p, oop v) {

  *p = encode_heap_oop_not_null(v);

}

inline void oopDesc::encode_store_heap_oop_not_null(oop* p, oop v) { *p = v; }

// Encode and store a heap oop allowing for null.

inline void oopDesc::encode_store_heap_oop(narrowOop* p, oop v) {

  *p = encode_heap_oop(v);

}

inline void oopDesc::encode_store_heap_oop(oop* p, oop v) { *p = v; }

// Store heap oop as is for volatile fields.

inline void oopDesc::release_store_heap_oop(volatile oop* p, oop v) {

  OrderAccess::release_store_ptr(p, v);

}

inline void oopDesc::release_store_heap_oop(volatile narrowOop* p,

                                            narrowOop v) {

  OrderAccess::release_store(p, v);

}

inline void oopDesc::release_encode_store_heap_oop_not_null(

                                                volatile narrowOop* p, oop v) {

  // heap oop is not pointer sized.

  OrderAccess::release_store(p, encode_heap_oop_not_null(v));

}

inline void oopDesc::release_encode_store_heap_oop_not_null(

                                                      volatile oop* p, oop v) {

  OrderAccess::release_store_ptr(p, v);

}

inline void oopDesc::release_encode_store_heap_oop(volatile oop* p,

                                                           oop v) {

  OrderAccess::release_store_ptr(p, v);

}

inline void oopDesc::release_encode_store_heap_oop(

                                                volatile narrowOop* p, oop v) {

  OrderAccess::release_store(p, encode_heap_oop(v));

}

// These functions are only used to exchange oop fields in instances,

// not headers.

inline oop oopDesc::atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest) {

  if (UseCompressedOops) {

    // encode exchange value from oop to T

    narrowOop val = encode_heap_oop(exchange_value);

    narrowOop old = (narrowOop)Atomic::xchg(val, (narrowOop*)dest);

    // decode old from T to oop

    return decode_heap_oop(old);

  } else {

    return (oop)Atomic::xchg_ptr(exchange_value, (oop*)dest);

  }

}

inline oop oopDesc::atomic_compare_exchange_oop(oop exchange_value,

                                                volatile HeapWord *dest,

                                                oop compare_value) {

  if (UseCompressedOops) {

    // encode exchange and compare value from oop to T

    narrowOop val = encode_heap_oop(exchange_value);

    narrowOop cmp = encode_heap_oop(compare_value);

    narrowOop old = (narrowOop) Atomic::cmpxchg(val, (narrowOop*)dest, cmp);

    // decode old from T to oop

    return decode_heap_oop(old);

  } else {

    return (oop)Atomic::cmpxchg_ptr(exchange_value, (oop*)dest, compare_value);

  }

}

// In order to put or get a field out of an instance, must first check

// if the field has been compressed and uncompress it.

inline oop oopDesc::obj_field(int offset) const {

  return UseCompressedOops ?

    load_decode_heap_oop(obj_field_addr<narrowOop>(offset)) :

    load_decode_heap_oop(obj_field_addr<oop>(offset));

}

inline void oopDesc::obj_field_put(int offset, oop value) {

  UseCompressedOops ? oop_store(obj_field_addr<narrowOop>(offset), value) :

                      oop_store(obj_field_addr<oop>(offset),       value);

}

inline void oopDesc::obj_field_raw_put(int offset, oop value) {

  UseCompressedOops ?

    encode_store_heap_oop(obj_field_addr<narrowOop>(offset), value) :

    encode_store_heap_oop(obj_field_addr<oop>(offset),       value);

}

inline jbyte oopDesc::byte_field(int offset) const                  { return (jbyte) *byte_field_addr(offset);    }

inline void oopDesc::byte_field_put(int offset, jbyte contents)     { *byte_field_addr(offset) = (jint) contents; }

inline jboolean oopDesc::bool_field(int offset) const               { return (jboolean) *bool_field_addr(offset); }

inline void oopDesc::bool_field_put(int offset, jboolean contents)  { *bool_field_addr(offset) = (jint) contents; }

inline jchar oopDesc::char_field(int offset) const                  { return (jchar) *char_field_addr(offset);    }

inline void oopDesc::char_field_put(int offset, jchar contents)     { *char_field_addr(offset) = (jint) contents; }

inline jint oopDesc::int_field(int offset) const                    { return *int_field_addr(offset);        }

inline void oopDesc::int_field_put(int offset, jint contents)       { *int_field_addr(offset) = contents;    }

inline jshort oopDesc::short_field(int offset) const                { return (jshort) *short_field_addr(offset);  }

inline void oopDesc::short_field_put(int offset, jshort contents)   { *short_field_addr(offset) = (jint) contents;}

inline jlong oopDesc::long_field(int offset) const                  { return *long_field_addr(offset);       }

inline void oopDesc::long_field_put(int offset, jlong contents)     { *long_field_addr(offset) = contents;   }

inline jfloat oopDesc::float_field(int offset) const                { return *float_field_addr(offset);      }

inline void oopDesc::float_field_put(int offset, jfloat contents)   { *float_field_addr(offset) = contents;  }

inline jdouble oopDesc::double_field(int offset) const              { return *double_field_addr(offset);     }

inline void oopDesc::double_field_put(int offset, jdouble contents) { *double_field_addr(offset) = contents; }

inline address oopDesc::address_field(int offset) const              { return *address_field_addr(offset);     }

inline void oopDesc::address_field_put(int offset, address contents) { *address_field_addr(offset) = contents; }

inline oop oopDesc::obj_field_acquire(int offset) const {

  return UseCompressedOops ?

             decode_heap_oop((narrowOop)

               OrderAccess::load_acquire(obj_field_addr<narrowOop>(offset)))

           : decode_heap_oop((oop)

               OrderAccess::load_ptr_acquire(obj_field_addr<oop>(offset)));

}

inline void oopDesc::release_obj_field_put(int offset, oop value) {

  UseCompressedOops ?

    oop_store((volatile narrowOop*)obj_field_addr<narrowOop>(offset), value) :

    oop_store((volatile oop*)      obj_field_addr<oop>(offset),       value);

}

inline jbyte oopDesc::byte_field_acquire(int offset) const                  { return OrderAccess::load_acquire(byte_field_addr(offset));     }

inline void oopDesc::release_byte_field_put(int offset, jbyte contents)     { OrderAccess::release_store(byte_field_addr(offset), contents); }

inline jboolean oopDesc::bool_field_acquire(int offset) const               { return OrderAccess::load_acquire(bool_field_addr(offset));     }

inline void oopDesc::release_bool_field_put(int offset, jboolean contents)  { OrderAccess::release_store(bool_field_addr(offset), contents); }

inline jchar oopDesc::char_field_acquire(int offset) const                  { return OrderAccess::load_acquire(char_field_addr(offset));     }

inline void oopDesc::release_char_field_put(int offset, jchar contents)     { OrderAccess::release_store(char_field_addr(offset), contents); }

inline jint oopDesc::int_field_acquire(int offset) const                    { return OrderAccess::load_acquire(int_field_addr(offset));      }

inline void oopDesc::release_int_field_put(int offset, jint contents)       { OrderAccess::release_store(int_field_addr(offset), contents);  }

inline jshort oopDesc::short_field_acquire(int offset) const                { return (jshort)OrderAccess::load_acquire(short_field_addr(offset)); }

inline void oopDesc::release_short_field_put(int offset, jshort contents)   { OrderAccess::release_store(short_field_addr(offset), contents);     }

inline jlong oopDesc::long_field_acquire(int offset) const                  { return OrderAccess::load_acquire(long_field_addr(offset));       }

inline void oopDesc::release_long_field_put(int offset, jlong contents)     { OrderAccess::release_store(long_field_addr(offset), contents);   }

inline jfloat oopDesc::float_field_acquire(int offset) const                { return OrderAccess::load_acquire(float_field_addr(offset));      }

inline void oopDesc::release_float_field_put(int offset, jfloat contents)   { OrderAccess::release_store(float_field_addr(offset), contents);  }

inline jdouble oopDesc::double_field_acquire(int offset) const              { return OrderAccess::load_acquire(double_field_addr(offset));     }

inline void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); }

inline int oopDesc::size_given_klass(Klass* klass)  {

  int lh = klass->layout_helper();

  int s  = lh >> LogHeapWordSize;  // deliver size scaled by wordSize

  // lh is now a value computed at class initialization that may hint

  // at the size.  For instances, this is positive and equal to the

  // size.  For arrays, this is negative and provides log2 of the

  // array element size.  For other oops, it is zero and thus requires

  // a virtual call.

  //

  // We go to all this trouble because the size computation is at the

  // heart of phase 2 of mark-compaction, and called for every object,

  // alive or dead.  So the speed here is equal in importance to the

  // speed of allocation.

  if (lh <= Klass::_lh_neutral_value) {

    // The most common case is instances; fall through if so.

    if (lh < Klass::_lh_neutral_value) {

      // Second most common case is arrays.  We have to fetch the

      // length of the array, shift (multiply) it appropriately,

      // up to wordSize, add the header, and align to object size.

      size_t size_in_bytes;

#ifdef _M_IA64

      // The Windows Itanium Aug 2002 SDK hoists this load above

      // the check for s < 0.  An oop at the end of the heap will

      // cause an access violation if this load is performed on a non

      // array oop.  Making the reference volatile prohibits this.

      // (%%% please explain by what magic the length is actually fetched!)

      volatile int *array_length;

      array_length = (volatile int *)( (intptr_t)this +

                          arrayOopDesc::length_offset_in_bytes() );

      assert(array_length > 0, "Integer arithmetic problem somewhere");

      // Put into size_t to avoid overflow.

      size_in_bytes = (size_t) array_length;

      size_in_bytes = size_in_bytes << Klass::layout_helper_log2_element_size(lh);

#else

      size_t array_length = (size_t) ((arrayOop)this)->length();

      size_in_bytes = array_length << Klass::layout_helper_log2_element_size(lh);

#endif

      size_in_bytes += Klass::layout_helper_header_size(lh);

      // This code could be simplified, but by keeping array_header_in_bytes

      // in units of bytes and doing it this way we can round up just once,

      // skipping the intermediate round to HeapWordSize.  Cast the result

      // of round_to to size_t to guarantee unsigned division == right shift.

      s = (int)((size_t)round_to(size_in_bytes, MinObjAlignmentInBytes) /

        HeapWordSize);

      // UseParNewGC, UseParallelGC and UseG1GC can change the length field

      // of an "old copy" of an object array in the young gen so it indicates

      // the grey portion of an already copied array. This will cause the first

      // disjunct below to fail if the two comparands are computed across such

      // a concurrent change.

      // UseParNewGC also runs with promotion labs (which look like int

      // filler arrays) which are subject to changing their declared size

      // when finally retiring a PLAB; this also can cause the first disjunct

      // to fail for another worker thread that is concurrently walking the block

      // offset table. Both these invariant failures are benign for their

      // current uses; we relax the assertion checking to cover these two cases below:

      //     is_objArray() && is_forwarded()   // covers first scenario above

      //  || is_typeArray()                    // covers second scenario above

      // If and when UseParallelGC uses the same obj array oop stealing/chunking

      // technique, we will need to suitably modify the assertion.

      assert((s == klass->oop_size(this)) ||

             (Universe::heap()->is_gc_active() &&

              ((is_typeArray() && UseParNewGC) ||

               (is_objArray()  && is_forwarded() && (UseParNewGC || UseParallelGC || UseG1GC)))),

             "wrong array object size");

    } else {

      // Must be zero, so bite the bullet and take the virtual call.

      s = klass->oop_size(this);

    }

  }

  assert(s % MinObjAlignment == 0, "alignment check");

  assert(s > 0, "Bad size calculated");

  return s;

}

inline int oopDesc::size()  {

  return size_given_klass(blueprint());

}

inline bool oopDesc::is_parsable() {

  return blueprint()->oop_is_parsable(this);

}

inline bool oopDesc::is_conc_safe() {

  return blueprint()->oop_is_conc_safe(this);

}

inline void update_barrier_set(void* p, oop v) {

  assert(oopDesc::bs() != NULL, "Uninitialized bs in oop!");

  oopDesc::bs()->write_ref_field(p, v);

}

inline void update_barrier_set_pre(void* p, oop v) {

  oopDesc::bs()->write_ref_field_pre(p, v);

}

template <class T> inline void oop_store(T* p, oop v) {

  if (always_do_update_barrier) {

    oop_store((volatile T*)p, v);

  } else {

    update_barrier_set_pre(p, v);

    oopDesc::encode_store_heap_oop(p, v);

    update_barrier_set(p, v);

  }

}

template <class T> inline void oop_store(volatile T* p, oop v) {

  update_barrier_set_pre((void*)p, v);

  // Used by release_obj_field_put, so use release_store_ptr.

  oopDesc::release_encode_store_heap_oop(p, v);

  update_barrier_set((void*)p, v);

}

template <class T> inline void oop_store_without_check(T* p, oop v) {

  // XXX YSR FIX ME!!!

  if (always_do_update_barrier) {

    oop_store(p, v);

  } else {

    assert(!Universe::heap()->barrier_set()->write_ref_needs_barrier(p, v),

           "oop store without store check failed");

    oopDesc::encode_store_heap_oop(p, v);

  }

}

// When it absolutely has to get there.

template <class T> inline void oop_store_without_check(volatile T* p, oop v) {

  // XXX YSR FIX ME!!!

  if (always_do_update_barrier) {

    oop_store(p, v);

  } else {

    assert(!Universe::heap()->barrier_set()->write_ref_needs_barrier((T*)p, v),

           "oop store without store check failed");

    oopDesc::release_encode_store_heap_oop(p, v);

  }

}

// Should replace *addr = oop assignments where addr type depends on UseCompressedOops

// (without having to remember the function name this calls).

inline void oop_store_raw(HeapWord* addr, oop value) {

  if (UseCompressedOops) {

    oopDesc::encode_store_heap_oop((narrowOop*)addr, value);

  } else {

    oopDesc::encode_store_heap_oop((oop*)addr, value);

  }

}

// Used only for markSweep, scavenging

inline bool oopDesc::is_gc_marked() const {

  return mark()->is_marked();

}