/*

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 * 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.

 *

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 */

#ifndef SHARE_OOPS_OOP_INLINE_HPP

#define SHARE_OOPS_OOP_INLINE_HPP

#include "gc/shared/collectedHeap.hpp"

#include "memory/universe.hpp"

#include "oops/access.inline.hpp"

#include "oops/arrayKlass.hpp"

#include "oops/arrayOop.hpp"

#include "oops/compressedOops.inline.hpp"

#include "oops/klass.inline.hpp"

#include "oops/markWord.inline.hpp"

#include "oops/oop.hpp"

#include "runtime/atomic.hpp"

#include "runtime/orderAccess.hpp"

#include "runtime/os.hpp"

#include "utilities/align.hpp"

#include "utilities/macros.hpp"

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

// We need a separate file to avoid circular references

markWord oopDesc::mark() const {

  uintptr_t v = HeapAccess<MO_VOLATILE>::load_at(as_oop(), mark_offset_in_bytes());

  return markWord(v);

}

markWord oopDesc::mark_raw() const {

  return Atomic::load(&_mark);

}

markWord* oopDesc::mark_addr_raw() const {

  return (markWord*) &_mark;

}

void oopDesc::set_mark(markWord m) {

  HeapAccess<MO_VOLATILE>::store_at(as_oop(), mark_offset_in_bytes(), m.value());

}

void oopDesc::set_mark_raw(markWord m) {

  Atomic::store(m, &_mark);

}

void oopDesc::set_mark_raw(HeapWord* mem, markWord m) {

  *(markWord*)(((char*)mem) + mark_offset_in_bytes()) = m;

}

void oopDesc::release_set_mark(markWord m) {

  HeapAccess<MO_RELEASE>::store_at(as_oop(), mark_offset_in_bytes(), m.value());

}

markWord oopDesc::cas_set_mark(markWord new_mark, markWord old_mark) {

  uintptr_t v = HeapAccess<>::atomic_cmpxchg_at(new_mark.value(), as_oop(), mark_offset_in_bytes(), old_mark.value());

  return markWord(v);

}

markWord oopDesc::cas_set_mark_raw(markWord new_mark, markWord old_mark, atomic_memory_order order) {

  return Atomic::cmpxchg(new_mark, &_mark, old_mark, order);

}

void oopDesc::init_mark() {

  set_mark(markWord::prototype_for_klass(klass()));

}

void oopDesc::init_mark_raw() {

  set_mark_raw(markWord::prototype_for_klass(klass()));

}

Klass* oopDesc::klass() const {

  if (UseCompressedClassPointers) {

    return CompressedKlassPointers::decode_not_null(_metadata._compressed_klass);

  } else {

    return _metadata._klass;

  }

}

Klass* oopDesc::klass_or_null() const volatile {

  if (UseCompressedClassPointers) {

    return CompressedKlassPointers::decode(_metadata._compressed_klass);

  } else {

    return _metadata._klass;

  }

}

Klass* oopDesc::klass_or_null_acquire() const volatile {

  if (UseCompressedClassPointers) {

    // Workaround for non-const load_acquire parameter.

    const volatile narrowKlass* addr = &_metadata._compressed_klass;

    volatile narrowKlass* xaddr = const_cast<volatile narrowKlass*>(addr);

    return CompressedKlassPointers::decode(OrderAccess::load_acquire(xaddr));

  } else {

    return OrderAccess::load_acquire(&_metadata._klass);

  }

}

Klass** oopDesc::klass_addr(HeapWord* mem) {

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

  // UseCompressedOops

  assert(!UseCompressedClassPointers, "only supported with uncompressed klass pointers");

  ByteSize offset = byte_offset_of(oopDesc, _metadata._klass);

  return (Klass**) (((char*)mem) + in_bytes(offset));

}

narrowKlass* oopDesc::compressed_klass_addr(HeapWord* mem) {

  assert(UseCompressedClassPointers, "only called by compressed klass pointers");

  ByteSize offset = byte_offset_of(oopDesc, _metadata._compressed_klass);

  return (narrowKlass*) (((char*)mem) + in_bytes(offset));

}

Klass** oopDesc::klass_addr() {

  return klass_addr((HeapWord*)this);

}

narrowKlass* oopDesc::compressed_klass_addr() {

  return compressed_klass_addr((HeapWord*)this);

}

#define CHECK_SET_KLASS(k)                                                \

  do {                                                                    \

    assert(Universe::is_bootstrapping() || k != NULL, "NULL Klass");      \

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

  } while (0)

void oopDesc::set_klass(Klass* k) {

  CHECK_SET_KLASS(k);

  if (UseCompressedClassPointers) {

    *compressed_klass_addr() = CompressedKlassPointers::encode_not_null(k);

  } else {

    *klass_addr() = k;

  }

}

void oopDesc::release_set_klass(HeapWord* mem, Klass* klass) {

  CHECK_SET_KLASS(klass);

  if (UseCompressedClassPointers) {

    OrderAccess::release_store(compressed_klass_addr(mem),

                               CompressedKlassPointers::encode_not_null(klass));

  } else {

    OrderAccess::release_store(klass_addr(mem), klass);

  }

}

#undef CHECK_SET_KLASS

int oopDesc::klass_gap() const {

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

}

void oopDesc::set_klass_gap(HeapWord* mem, int v) {

  if (UseCompressedClassPointers) {

    *(int*)(((char*)mem) + klass_gap_offset_in_bytes()) = v;

  }

}

void oopDesc::set_klass_gap(int v) {

  set_klass_gap((HeapWord*)this, v);

}

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 (UseCompressedClassPointers) {

    _metadata._compressed_klass = (narrowKlass)CompressedOops::encode(k);  // may be null (parnew overflow handling)

  } else {

    _metadata._klass = (Klass*)(address)k;

  }

}

oop oopDesc::list_ptr_from_klass() {

  // This is only to be used during GC, for from-space objects.

  if (UseCompressedClassPointers) {

    return CompressedOops::decode((narrowOop)_metadata._compressed_klass);

  } else {

    // Special case for GC

    return (oop)(address)_metadata._klass;

  }

}

bool oopDesc::is_a(Klass* k) const {

  return klass()->is_subtype_of(k);

}

int oopDesc::size()  {

  return size_given_klass(klass());

}

int oopDesc::size_given_klass(Klass* klass)  {

  int lh = klass->layout_helper();

  int s;

  // 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) {

    if (!Klass::layout_helper_needs_slow_path(lh)) {

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

    } else {

      s = klass->oop_size(this);

    }

  } else 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;

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

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

      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.

      s = (int)(align_up(size_in_bytes, MinObjAlignmentInBytes) / HeapWordSize);

      // ParNew (used by CMS), 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.

      // ParNew 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() && UseConcMarkSweepGC) ||

               (is_objArray()  && is_forwarded() && (UseConcMarkSweepGC || 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 > 0, "Oop size must be greater than zero, not %d", s);

  assert(is_object_aligned(s), "Oop size is not properly aligned: %d", s);

  return s;

}

bool oopDesc::is_instance()  const { return klass()->is_instance_klass();  }

bool oopDesc::is_array()     const { return klass()->is_array_klass();     }

bool oopDesc::is_objArray()  const { return klass()->is_objArray_klass();  }

bool oopDesc::is_typeArray() const { return klass()->is_typeArray_klass(); }

void*    oopDesc::field_addr_raw(int offset)     const { return reinterpret_cast<void*>(cast_from_oop<intptr_t>(as_oop()) + offset); }

void*    oopDesc::field_addr(int offset)         const { return Access<>::resolve(as_oop())->field_addr_raw(offset); }

template <class T>

T*       oopDesc::obj_field_addr_raw(int offset) const { return (T*) field_addr_raw(offset); }

template <typename T>

size_t   oopDesc::field_offset(T* p) const { return pointer_delta((void*)p, (void*)this, 1); }

template <DecoratorSet decorators>

inline oop  oopDesc::obj_field_access(int offset) const             { return HeapAccess<decorators>::oop_load_at(as_oop(), offset); }

inline oop  oopDesc::obj_field(int offset) const                    { return HeapAccess<>::oop_load_at(as_oop(), offset);  }

inline void oopDesc::obj_field_put(int offset, oop value)           { HeapAccess<>::oop_store_at(as_oop(), offset, value); }

inline jbyte oopDesc::byte_field(int offset) const                  { return HeapAccess<>::load_at(as_oop(), offset);  }

inline void  oopDesc::byte_field_put(int offset, jbyte value)       { HeapAccess<>::store_at(as_oop(), offset, value); }

inline jchar oopDesc::char_field(int offset) const                  { return HeapAccess<>::load_at(as_oop(), offset);  }

inline void  oopDesc::char_field_put(int offset, jchar value)       { HeapAccess<>::store_at(as_oop(), offset, value); }

inline jboolean oopDesc::bool_field(int offset) const               { return HeapAccess<>::load_at(as_oop(), offset);                }

inline void     oopDesc::bool_field_put(int offset, jboolean value) { HeapAccess<>::store_at(as_oop(), offset, jboolean(value & 1)); }

inline jshort oopDesc::short_field(int offset) const                { return HeapAccess<>::load_at(as_oop(), offset);  }

inline void   oopDesc::short_field_put(int offset, jshort value)    { HeapAccess<>::store_at(as_oop(), offset, value); }

inline jint oopDesc::int_field(int offset) const                    { return HeapAccess<>::load_at(as_oop(), offset);  }

inline jint oopDesc::int_field_raw(int offset) const                { return RawAccess<>::load_at(as_oop(), offset);   }

inline void oopDesc::int_field_put(int offset, jint value)          { HeapAccess<>::store_at(as_oop(), offset, value); }

inline jlong oopDesc::long_field(int offset) const                  { return HeapAccess<>::load_at(as_oop(), offset);  }

inline void  oopDesc::long_field_put(int offset, jlong value)       { HeapAccess<>::store_at(as_oop(), offset, value); }

inline jfloat oopDesc::float_field(int offset) const                { return HeapAccess<>::load_at(as_oop(), offset);  }

inline void   oopDesc::float_field_put(int offset, jfloat value)    { HeapAccess<>::store_at(as_oop(), offset, value); }

inline jdouble oopDesc::double_field(int offset) const              { return HeapAccess<>::load_at(as_oop(), offset);  }

inline void    oopDesc::double_field_put(int offset, jdouble value) { HeapAccess<>::store_at(as_oop(), offset, value); }

bool oopDesc::is_locked() const {

  return mark().is_locked();

}

bool oopDesc::is_unlocked() const {

  return mark().is_unlocked();

}

bool oopDesc::has_bias_pattern() const {

  return mark().has_bias_pattern();

}

bool oopDesc::has_bias_pattern_raw() const {

  return mark_raw().has_bias_pattern();

}

// Used only for markSweep, scavenging

bool oopDesc::is_gc_marked() const {

  return mark_raw().is_marked();

}

// Used by scavengers

bool oopDesc::is_forwarded() const {

  // The extra heap check is needed since the obj might be locked, in which case the

  // mark would point to a stack location and have the sentinel bit cleared

  return mark_raw().is_marked();

}

// Used by scavengers

void oopDesc::forward_to(oop p) {

  verify_forwardee(p);

  markWord m = markWord::encode_pointer_as_mark(p);

  assert(m.decode_pointer() == p, "encoding must be reversable");

  set_mark_raw(m);

}

// Used by parallel scavengers

bool oopDesc::cas_forward_to(oop p, markWord compare, atomic_memory_order order) {

  verify_forwardee(p);

  markWord m = markWord::encode_pointer_as_mark(p);

  assert(m.decode_pointer() == p, "encoding must be reversable");

  return cas_set_mark_raw(m, compare, order) == compare;

}

oop oopDesc::forward_to_atomic(oop p, markWord compare, atomic_memory_order order) {

  verify_forwardee(p);

  markWord m = markWord::encode_pointer_as_mark(p);

  assert(m.decode_pointer() == p, "encoding must be reversable");

  markWord old_mark = cas_set_mark_raw(m, compare, order);

  if (old_mark == compare) {

    return NULL;

  } else {

    return (oop)old_mark.decode_pointer();

  }

}

// Note that the forwardee is not the same thing as the displaced_mark.

// The forwardee is used when copying during scavenge and mark-sweep.

// It does need to clear the low two locking- and GC-related bits.

oop oopDesc::forwardee() const {

  return (oop) mark_raw().decode_pointer();

}

// Note that the forwardee is not the same thing as the displaced_mark.

// The forwardee is used when copying during scavenge and mark-sweep.

// It does need to clear the low two locking- and GC-related bits.

oop oopDesc::forwardee_acquire() const {

  return (oop) OrderAccess::load_acquire(&_mark).decode_pointer();

}

// The following method needs to be MT safe.

uint oopDesc::age() const {

  assert(!is_forwarded(), "Attempt to read age from forwarded mark");

  if (has_displaced_mark_raw()) {

    return displaced_mark_raw().age();

  } else {

    return mark_raw().age();

  }

}

void oopDesc::incr_age() {

  assert(!is_forwarded(), "Attempt to increment age of forwarded mark");

  if (has_displaced_mark_raw()) {

    set_displaced_mark_raw(displaced_mark_raw().incr_age());

  } else {

    set_mark_raw(mark_raw().incr_age());

  }

}

template <typename OopClosureType>

void oopDesc::oop_iterate(OopClosureType* cl) {

  OopIteratorClosureDispatch::oop_oop_iterate(cl, this, klass());

}

template <typename OopClosureType>

void oopDesc::oop_iterate(OopClosureType* cl, MemRegion mr) {

  OopIteratorClosureDispatch::oop_oop_iterate(cl, this, klass(), mr);

}

template <typename OopClosureType>

int oopDesc::oop_iterate_size(OopClosureType* cl) {

  Klass* k = klass();

  int size = size_given_klass(k);

  OopIteratorClosureDispatch::oop_oop_iterate(cl, this, k);

  return size;

}

template <typename OopClosureType>

int oopDesc::oop_iterate_size(OopClosureType* cl, MemRegion mr) {

  Klass* k = klass();

  int size = size_given_klass(k);

  OopIteratorClosureDispatch::oop_oop_iterate(cl, this, k, mr);

  return size;

}

template <typename OopClosureType>

void oopDesc::oop_iterate_backwards(OopClosureType* cl) {

  OopIteratorClosureDispatch::oop_oop_iterate_backwards(cl, this, klass());

}

bool oopDesc::is_instanceof_or_null(oop obj, Klass* klass) {

  return obj == NULL || obj->klass()->is_subtype_of(klass);

}

intptr_t oopDesc::identity_hash() {

  // Fast case; if the object is unlocked and the hash value is set, no locking is needed

  // Note: The mark must be read into local variable to avoid concurrent updates.

  markWord mrk = mark();

  if (mrk.is_unlocked() && !mrk.has_no_hash()) {

    return mrk.hash();

  } else if (mrk.is_marked()) {

    return mrk.hash();

  } else {

    return slow_identity_hash();

  }

}

bool oopDesc::has_displaced_mark_raw() const {

  return mark_raw().has_displaced_mark_helper();

}

markWord oopDesc::displaced_mark_raw() const {

  return mark_raw().displaced_mark_helper();

}

void oopDesc::set_displaced_mark_raw(markWord m) {

  mark_raw().set_displaced_mark_helper(m);

}

// Supports deferred calling of obj->klass().

class DeferredObjectToKlass {

  const oopDesc* _obj;

public:

  DeferredObjectToKlass(const oopDesc* obj) : _obj(obj) {}

  // Implicitly convertible to const Klass*.

  operator const Klass*() const {

    return _obj->klass();

  }

};

bool oopDesc::mark_must_be_preserved() const {

  return mark_must_be_preserved(mark_raw());

}