/*

 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

# include "incls/_precompiled.incl"

# include "incls/_objArrayKlass.cpp.incl"

int objArrayKlass::oop_size(oop obj) const {

  assert(obj->is_objArray(), "must be object array");

  return objArrayOop(obj)->object_size();

}

objArrayOop objArrayKlass::allocate(int length, TRAPS) {

  if (length >= 0) {

    if (length <= arrayOopDesc::max_array_length(T_OBJECT)) {

      int size = objArrayOopDesc::object_size(length);

      KlassHandle h_k(THREAD, as_klassOop());

      objArrayOop a = (objArrayOop)CollectedHeap::array_allocate(h_k, size, length, CHECK_NULL);

      assert(a->is_parsable(), "Can't publish unless parsable");

      return a;

    } else {

      report_java_out_of_memory("Requested array size exceeds VM limit");

      THROW_OOP_0(Universe::out_of_memory_error_array_size());

    }

  } else {

    THROW_0(vmSymbols::java_lang_NegativeArraySizeException());

  }

}

static int multi_alloc_counter = 0;

oop objArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) {

  int length = *sizes;

  // Call to lower_dimension uses this pointer, so most be called before a

  // possible GC

  KlassHandle h_lower_dimension(THREAD, lower_dimension());

  // If length < 0 allocate will throw an exception.

  objArrayOop array = allocate(length, CHECK_NULL);

  assert(array->is_parsable(), "Don't handlize unless parsable");

  objArrayHandle h_array (THREAD, array);

  if (rank > 1) {

    if (length != 0) {

      for (int index = 0; index < length; index++) {

        arrayKlass* ak = arrayKlass::cast(h_lower_dimension());

        oop sub_array = ak->multi_allocate(rank-1, &sizes[1], CHECK_NULL);

        assert(sub_array->is_parsable(), "Don't publish until parsable");

        h_array->obj_at_put(index, sub_array);

      }

    } else {

      // Since this array dimension has zero length, nothing will be

      // allocated, however the lower dimension values must be checked

      // for illegal values.

      for (int i = 0; i < rank - 1; ++i) {

        sizes += 1;

        if (*sizes < 0) {

          THROW_0(vmSymbols::java_lang_NegativeArraySizeException());

        }

      }

    }

  }

  return h_array();

}

// Either oop or narrowOop depending on UseCompressedOops.

template <class T> void objArrayKlass::do_copy(arrayOop s, T* src,

                               arrayOop d, T* dst, int length, TRAPS) {

  BarrierSet* bs = Universe::heap()->barrier_set();

  // For performance reasons, we assume we are that the write barrier we

  // are using has optimized modes for arrays of references.  At least one

  // of the asserts below will fail if this is not the case.

  assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");

  assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");

  if (s == d) {

    // since source and destination are equal we do not need conversion checks.

    assert(length > 0, "sanity check");

    bs->write_ref_array_pre(dst, length);

    Copy::conjoint_oops_atomic(src, dst, length);

  } else {

    // We have to make sure all elements conform to the destination array

    klassOop bound = objArrayKlass::cast(d->klass())->element_klass();

    klassOop stype = objArrayKlass::cast(s->klass())->element_klass();

    if (stype == bound || Klass::cast(stype)->is_subtype_of(bound)) {

      // elements are guaranteed to be subtypes, so no check necessary

      bs->write_ref_array_pre(dst, length);

      Copy::conjoint_oops_atomic(src, dst, length);

    } else {

      // slow case: need individual subtype checks

      // note: don't use obj_at_put below because it includes a redundant store check

      T* from = src;

      T* end = from + length;

      for (T* p = dst; from < end; from++, p++) {

        // XXX this is going to be slow.

        T element = *from;

        // even slower now

        bool element_is_null = oopDesc::is_null(element);

        oop new_val = element_is_null ? oop(NULL)

                                      : oopDesc::decode_heap_oop_not_null(element);

        if (element_is_null ||

            Klass::cast((new_val->klass()))->is_subtype_of(bound)) {

          bs->write_ref_field_pre(p, new_val);

          *p = *from;

        } else {

          // We must do a barrier to cover the partial copy.

          const size_t pd = pointer_delta(p, dst, (size_t)heapOopSize);

          // pointer delta is scaled to number of elements (length field in

          // objArrayOop) which we assume is 32 bit.

          assert(pd == (size_t)(int)pd, "length field overflow");

          bs->write_ref_array((HeapWord*)dst, pd);

          THROW(vmSymbols::java_lang_ArrayStoreException());

          return;

        }

      }

    }

  }

  bs->write_ref_array((HeapWord*)dst, length);

}

void objArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d,

                               int dst_pos, int length, TRAPS) {

  assert(s->is_objArray(), "must be obj array");

  if (!d->is_objArray()) {

    THROW(vmSymbols::java_lang_ArrayStoreException());

  }

  // Check is all offsets and lengths are non negative

  if (src_pos < 0 || dst_pos < 0 || length < 0) {

    THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());

  }

  // Check if the ranges are valid

  if  ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length())

     || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) {

    THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());

  }

  // Special case. Boundary cases must be checked first

  // This allows the following call: copy_array(s, s.length(), d.length(), 0).

  // This is correct, since the position is supposed to be an 'in between point', i.e., s.length(),

  // points to the right of the last element.

  if (length==0) {

    return;

  }

  if (UseCompressedOops) {

    narrowOop* const src = objArrayOop(s)->obj_at_addr<narrowOop>(src_pos);

    narrowOop* const dst = objArrayOop(d)->obj_at_addr<narrowOop>(dst_pos);

    do_copy<narrowOop>(s, src, d, dst, length, CHECK);

  } else {

    oop* const src = objArrayOop(s)->obj_at_addr<oop>(src_pos);

    oop* const dst = objArrayOop(d)->obj_at_addr<oop>(dst_pos);

    do_copy<oop> (s, src, d, dst, length, CHECK);

  }

}

klassOop objArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) {

  objArrayKlassHandle h_this(THREAD, as_klassOop());

  return array_klass_impl(h_this, or_null, n, CHECK_NULL);

}

klassOop objArrayKlass::array_klass_impl(objArrayKlassHandle this_oop, bool or_null, int n, TRAPS) {

  assert(this_oop->dimension() <= n, "check order of chain");

  int dimension = this_oop->dimension();

  if (dimension == n)

    return this_oop();

  objArrayKlassHandle ak (THREAD, this_oop->higher_dimension());

  if (ak.is_null()) {

    if (or_null)  return NULL;

    ResourceMark rm;

    JavaThread *jt = (JavaThread *)THREAD;

    {

      MutexLocker mc(Compile_lock, THREAD);   // for vtables

      // Ensure atomic creation of higher dimensions

      MutexLocker mu(MultiArray_lock, THREAD);

      // Check if another thread beat us

      ak = objArrayKlassHandle(THREAD, this_oop->higher_dimension());

      if( ak.is_null() ) {

        // Create multi-dim klass object and link them together

        klassOop new_klass =

          objArrayKlassKlass::cast(Universe::objArrayKlassKlassObj())->

          allocate_objArray_klass(dimension + 1, this_oop, CHECK_NULL);

        ak = objArrayKlassHandle(THREAD, new_klass);

        this_oop->set_higher_dimension(ak());

        ak->set_lower_dimension(this_oop());

        assert(ak->oop_is_objArray(), "incorrect initialization of objArrayKlass");

      }

    }

  } else {

    CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());

  }

  if (or_null) {

    return ak->array_klass_or_null(n);

  }

  return ak->array_klass(n, CHECK_NULL);

}

klassOop objArrayKlass::array_klass_impl(bool or_null, TRAPS) {

  return array_klass_impl(or_null, dimension() +  1, CHECK_NULL);

}

bool objArrayKlass::can_be_primary_super_slow() const {

  if (!bottom_klass()->klass_part()->can_be_primary_super())

    // array of interfaces

    return false;

  else

    return Klass::can_be_primary_super_slow();

}

objArrayOop objArrayKlass::compute_secondary_supers(int num_extra_slots, TRAPS) {

  // interfaces = { cloneable_klass, serializable_klass, elemSuper[], ... };

  objArrayOop es = Klass::cast(element_klass())->secondary_supers();

  objArrayHandle elem_supers (THREAD, es);

  int num_elem_supers = elem_supers.is_null() ? 0 : elem_supers->length();

  int num_secondaries = num_extra_slots + 2 + num_elem_supers;

  if (num_secondaries == 2) {

    // Must share this for correct bootstrapping!

    return Universe::the_array_interfaces_array();

  } else {

    objArrayOop sec_oop = oopFactory::new_system_objArray(num_secondaries, CHECK_NULL);

    objArrayHandle secondaries(THREAD, sec_oop);

    secondaries->obj_at_put(num_extra_slots+0, SystemDictionary::Cloneable_klass());

    secondaries->obj_at_put(num_extra_slots+1, SystemDictionary::Serializable_klass());

    for (int i = 0; i < num_elem_supers; i++) {

      klassOop elem_super = (klassOop) elem_supers->obj_at(i);

      klassOop array_super = elem_super->klass_part()->array_klass_or_null();

      assert(array_super != NULL, "must already have been created");

      secondaries->obj_at_put(num_extra_slots+2+i, array_super);

    }

    return secondaries();

  }

}

bool objArrayKlass::compute_is_subtype_of(klassOop k) {

  if (!k->klass_part()->oop_is_objArray())

    return arrayKlass::compute_is_subtype_of(k);

  objArrayKlass* oak = objArrayKlass::cast(k);

  return element_klass()->klass_part()->is_subtype_of(oak->element_klass());

}

void objArrayKlass::initialize(TRAPS) {

  Klass::cast(bottom_klass())->initialize(THREAD);  // dispatches to either instanceKlass or typeArrayKlass

}

#define ObjArrayKlass_SPECIALIZED_OOP_ITERATE(T, a, p, do_oop) \

{                                   \

  T* p         = (T*)(a)->base();   \

  T* const end = p + (a)->length(); \

  while (p < end) {                 \

    do_oop;                         \

    p++;                            \

  }                                 \

}

#define ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(T, a, p, low, high, do_oop) \

{                                   \

  T* const l = (T*)(low);           \

  T* const h = (T*)(high);          \

  T* p       = (T*)(a)->base();     \

  T* end     = p + (a)->length();   \

  if (p < l) p = l;                 \

  if (end > h) end = h;             \

  while (p < end) {                 \

    do_oop;                         \

    ++p;                            \

  }                                 \

}

#define ObjArrayKlass_OOP_ITERATE(a, p, do_oop)      \

  if (UseCompressedOops) {                           \

    ObjArrayKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \

      a, p, do_oop)                                  \

  } else {                                           \

    ObjArrayKlass_SPECIALIZED_OOP_ITERATE(oop,       \

      a, p, do_oop)                                  \

  }

#define ObjArrayKlass_BOUNDED_OOP_ITERATE(a, p, low, high, do_oop) \

  if (UseCompressedOops) {                                   \

    ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \

      a, p, low, high, do_oop)                               \

  } else {                                                   \

    ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop,       \

      a, p, low, high, do_oop)                               \

  }

void objArrayKlass::oop_follow_contents(oop obj) {

  assert (obj->is_array(), "obj must be array");

  objArrayOop(obj)->follow_header();

  if (UseCompressedOops) {

    objarray_follow_contents<narrowOop>(obj, 0);

  } else {

    objarray_follow_contents<oop>(obj, 0);

  }

}

#ifndef SERIALGC

void objArrayKlass::oop_follow_contents(ParCompactionManager* cm,

                                        oop obj) {

  assert(obj->is_array(), "obj must be array");

  objArrayOop(obj)->follow_header(cm);

  if (UseCompressedOops) {

    objarray_follow_contents<narrowOop>(cm, obj, 0);

  } else {

    objarray_follow_contents<oop>(cm, obj, 0);

  }

}

#endif // SERIALGC

#define ObjArrayKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix)           \

                                                                                \

int objArrayKlass::oop_oop_iterate##nv_suffix(oop obj,                          \

                                              OopClosureType* closure) {        \

  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::oa); \

  assert (obj->is_array(), "obj must be array");                                \

  objArrayOop a = objArrayOop(obj);                                             \

  /* Get size before changing pointers. */                                      \

  /* Don't call size() or oop_size() since that is a virtual call. */           \

  int size = a->object_size();                                                  \

  if (closure->do_header()) {                                                   \

    a->oop_iterate_header(closure);                                             \

  }                                                                             \

  ObjArrayKlass_OOP_ITERATE(a, p, (closure)->do_oop##nv_suffix(p))              \

  return size;                                                                  \

}

#define ObjArrayKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix)         \

                                                                                \

int objArrayKlass::oop_oop_iterate##nv_suffix##_m(oop obj,                      \

                                                  OopClosureType* closure,      \

                                                  MemRegion mr) {               \

  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::oa); \

  assert(obj->is_array(), "obj must be array");                                 \

  objArrayOop a  = objArrayOop(obj);                                            \

  /* Get size before changing pointers. */                                      \

  /* Don't call size() or oop_size() since that is a virtual call */            \

  int size = a->object_size();                                                  \

  if (closure->do_header()) {                                                   \

    a->oop_iterate_header(closure, mr);                                         \

  }                                                                             \

  ObjArrayKlass_BOUNDED_OOP_ITERATE(                                            \

    a, p, mr.start(), mr.end(), (closure)->do_oop##nv_suffix(p))                \

  return size;                                                                  \

}

// Like oop_oop_iterate but only iterates over a specified range and only used

// for objArrayOops.

#define ObjArrayKlass_OOP_OOP_ITERATE_DEFN_r(OopClosureType, nv_suffix)         \

                                                                                \

int objArrayKlass::oop_oop_iterate_range##nv_suffix(oop obj,                    \

                                                  OopClosureType* closure,      \

                                                  int start, int end) {         \

  SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::oa); \

  assert(obj->is_array(), "obj must be array");                                 \

  objArrayOop a  = objArrayOop(obj);                                            \

  /* Get size before changing pointers. */                                      \

  /* Don't call size() or oop_size() since that is a virtual call */            \

  int size = a->object_size();                                                  \

  if (UseCompressedOops) {                                                      \

    HeapWord* low = start == 0 ? (HeapWord*)a : (HeapWord*)a->obj_at_addr<narrowOop>(start);\

    /* this might be wierd if end needs to be aligned on HeapWord boundary */   \

    HeapWord* high = (HeapWord*)((narrowOop*)a->base() + end);                  \

    MemRegion mr(low, high);                                                    \

    if (closure->do_header()) {                                                 \

      a->oop_iterate_header(closure, mr);                                       \

    }                                                                           \

    ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop,                    \

      a, p, low, high, (closure)->do_oop##nv_suffix(p))                         \

  } else {                                                                      \

    HeapWord* low = start == 0 ? (HeapWord*)a : (HeapWord*)a->obj_at_addr<oop>(start);  \

    HeapWord* high = (HeapWord*)((oop*)a->base() + end);                        \

    MemRegion mr(low, high);                                                    \

    if (closure->do_header()) {                                                 \

      a->oop_iterate_header(closure, mr);                                       \

    }                                                                           \

    ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop,                          \

      a, p, low, high, (closure)->do_oop##nv_suffix(p))                         \

  }                                                                             \

  return size;                                                                  \

}

ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DEFN)

ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DEFN)

ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_m)

ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_m)

ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_r)

ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_r)

int objArrayKlass::oop_adjust_pointers(oop obj) {

  assert(obj->is_objArray(), "obj must be obj array");

  objArrayOop a = objArrayOop(obj);

  // Get size before changing pointers.

  // Don't call size() or oop_size() since that is a virtual call.

  int size = a->object_size();

  a->adjust_header();

  ObjArrayKlass_OOP_ITERATE(a, p, MarkSweep::adjust_pointer(p))

  return size;

}

#ifndef SERIALGC

void objArrayKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {

  assert(obj->is_objArray(), "obj must be obj array");

  ObjArrayKlass_OOP_ITERATE( \

    objArrayOop(obj), p, \

    if (PSScavenge::should_scavenge(p)) { \

      pm->claim_or_forward_depth(p); \

    })

}

int objArrayKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {

  assert (obj->is_objArray(), "obj must be obj array");

  objArrayOop a = objArrayOop(obj);

  ObjArrayKlass_OOP_ITERATE(a, p, PSParallelCompact::adjust_pointer(p))

  return a->object_size();

}

int objArrayKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,

                                       HeapWord* beg_addr, HeapWord* end_addr) {

  assert (obj->is_objArray(), "obj must be obj array");

  objArrayOop a = objArrayOop(obj);

  ObjArrayKlass_BOUNDED_OOP_ITERATE( \

     a, p, beg_addr, end_addr, \

     PSParallelCompact::adjust_pointer(p))

  return a->object_size();

}

#endif // SERIALGC

// JVM support

jint objArrayKlass::compute_modifier_flags(TRAPS) const {

  // The modifier for an objectArray is the same as its element

  if (element_klass() == NULL) {

    assert(Universe::is_bootstrapping(), "partial objArray only at startup");

    return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;

  }

  // Return the flags of the bottom element type.

  jint element_flags = Klass::cast(bottom_klass())->compute_modifier_flags(CHECK_0);

  return (element_flags & (JVM_ACC_PUBLIC | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED))

                        | (JVM_ACC_ABSTRACT | JVM_ACC_FINAL);

}

#ifndef PRODUCT

// Printing

void objArrayKlass::oop_print_on(oop obj, outputStream* st) {

  arrayKlass::oop_print_on(obj, st);

  assert(obj->is_objArray(), "must be objArray");

  objArrayOop oa = objArrayOop(obj);

  int print_len = MIN2((intx) oa->length(), MaxElementPrintSize);

  for(int index = 0; index < print_len; index++) {

    st->print(" - %3d : ", index);

    oa->obj_at(index)->print_value_on(st);

    st->cr();

  }

  int remaining = oa->length() - print_len;

  if (remaining > 0) {

    tty->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining);

  }

}

#endif //PRODUCT

static int max_objArray_print_length = 4;

void objArrayKlass::oop_print_value_on(oop obj, outputStream* st) {

  assert(obj->is_objArray(), "must be objArray");

  st->print("a ");

  element_klass()->print_value_on(st);

  int len = objArrayOop(obj)->length();

  st->print("[%d] ", len);

  obj->print_address_on(st);

  if (NOT_PRODUCT(PrintOopAddress ||) PrintMiscellaneous && (WizardMode || Verbose)) {

    st->print("{");

    for (int i = 0; i < len; i++) {

      if (i > max_objArray_print_length) {

        st->print("..."); break;

      }

      st->print(" "INTPTR_FORMAT, (intptr_t)(void*)objArrayOop(obj)->obj_at(i));

    }

    st->print(" }");

  }