/*

 * Copyright 2001-2007 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.

 *

 */

// Inline allocation implementations.

void CollectedHeap::post_allocation_setup_common(KlassHandle klass,

                                                 HeapWord* obj,

                                                 size_t size) {

  post_allocation_setup_no_klass_install(klass, obj, size);

  post_allocation_install_obj_klass(klass, oop(obj), (int) size);

}

void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,

                                                           HeapWord* objPtr,

                                                           size_t size) {

  oop obj = (oop)objPtr;

  assert(obj != NULL, "NULL object pointer");

  if (UseBiasedLocking && (klass() != NULL)) {

    obj->set_mark(klass->prototype_header());

  } else {

    // May be bootstrapping

    obj->set_mark(markOopDesc::prototype());

  }

  // support low memory notifications (no-op if not enabled)

  LowMemoryDetector::detect_low_memory_for_collected_pools();

}

void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass,

                                                   oop obj,

                                                   int size) {

  // These asserts are kind of complicated because of klassKlass

  // and the beginning of the world.

  assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass");

  assert(klass() == NULL || klass()->is_klass(), "not a klass");

  assert(klass() == NULL || klass()->klass_part() != NULL, "not a klass");

  assert(obj != NULL, "NULL object pointer");

  obj->set_klass(klass());

  assert(!Universe::is_fully_initialized() || obj->blueprint() != NULL,

         "missing blueprint");

}

// Support for jvmti and dtrace

inline void post_allocation_notify(KlassHandle klass, oop obj) {

  // support for JVMTI VMObjectAlloc event (no-op if not enabled)

  JvmtiExport::vm_object_alloc_event_collector(obj);

  if (DTraceAllocProbes) {

    // support for Dtrace object alloc event (no-op most of the time)

    if (klass() != NULL && klass()->klass_part()->name() != NULL) {

      SharedRuntime::dtrace_object_alloc(obj);

    }

  }

}

void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,

                                              HeapWord* obj,

                                              size_t size) {

  post_allocation_setup_common(klass, obj, size);

  assert(Universe::is_bootstrapping() ||

         !((oop)obj)->blueprint()->oop_is_array(), "must not be an array");

  // notify jvmti and dtrace

  post_allocation_notify(klass, (oop)obj);

}

void CollectedHeap::post_allocation_setup_array(KlassHandle klass,

                                                HeapWord* obj,

                                                size_t size,

                                                int length) {

  assert(length >= 0, "length should be non-negative");

  post_allocation_setup_common(klass, obj, size);

  assert(((oop)obj)->blueprint()->oop_is_array(), "must be an array");

  // notify jvmti and dtrace (must be after length is set for dtrace)

  post_allocation_notify(klass, (oop)obj);

}

HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, bool is_noref, TRAPS) {

  // Clear unhandled oops for memory allocation.  Memory allocation might

  // not take out a lock if from tlab, so clear here.

  CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();)

  if (HAS_PENDING_EXCEPTION) {

    NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));

    return NULL;  // caller does a CHECK_0 too

  }

  // We may want to update this, is_noref objects might not be allocated in TLABs.

  HeapWord* result = NULL;

  if (UseTLAB) {

    result = CollectedHeap::allocate_from_tlab(THREAD, size);

    if (result != NULL) {

      assert(!HAS_PENDING_EXCEPTION,

             "Unexpected exception, will result in uninitialized storage");

      return result;

    }

  }

  bool gc_overhead_limit_was_exceeded;

  result = Universe::heap()->mem_allocate(size,

                                          is_noref,

                                          false,

                                          &gc_overhead_limit_was_exceeded);

  if (result != NULL) {

    NOT_PRODUCT(Universe::heap()->

      check_for_non_bad_heap_word_value(result, size));

    assert(!HAS_PENDING_EXCEPTION,

           "Unexpected exception, will result in uninitialized storage");

    return result;

  }

  if (!gc_overhead_limit_was_exceeded) {

    // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support

    report_java_out_of_memory("Java heap space");

    if (JvmtiExport::should_post_resource_exhausted()) {

      JvmtiExport::post_resource_exhausted(

        JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP,

        "Java heap space");

    }

    THROW_OOP_0(Universe::out_of_memory_error_java_heap());

  } else {

    // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support

    report_java_out_of_memory("GC overhead limit exceeded");

    if (JvmtiExport::should_post_resource_exhausted()) {

      JvmtiExport::post_resource_exhausted(

        JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP,

        "GC overhead limit exceeded");

    }

    THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit());

  }

}

HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, bool is_noref, TRAPS) {

  HeapWord* obj = common_mem_allocate_noinit(size, is_noref, CHECK_NULL);

  init_obj(obj, size);

  return obj;

}

// Need to investigate, do we really want to throw OOM exception here?

HeapWord* CollectedHeap::common_permanent_mem_allocate_noinit(size_t size, TRAPS) {

  if (HAS_PENDING_EXCEPTION) {

    NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));

    return NULL;  // caller does a CHECK_NULL too

  }

#ifdef ASSERT

  if (CIFireOOMAt > 0 && THREAD->is_Compiler_thread() &&

      ++_fire_out_of_memory_count >= CIFireOOMAt) {

    // For testing of OOM handling in the CI throw an OOM and see how

    // it does.  Historically improper handling of these has resulted

    // in crashes which we really don't want to have in the CI.

    THROW_OOP_0(Universe::out_of_memory_error_perm_gen());

  }

#endif

  HeapWord* result = Universe::heap()->permanent_mem_allocate(size);

  if (result != NULL) {

    NOT_PRODUCT(Universe::heap()->

      check_for_non_bad_heap_word_value(result, size));

    assert(!HAS_PENDING_EXCEPTION,

           "Unexpected exception, will result in uninitialized storage");

    return result;

  }

  // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support

  report_java_out_of_memory("PermGen space");

  if (JvmtiExport::should_post_resource_exhausted()) {

    JvmtiExport::post_resource_exhausted(

        JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,

        "PermGen space");

  }

  THROW_OOP_0(Universe::out_of_memory_error_perm_gen());

}

HeapWord* CollectedHeap::common_permanent_mem_allocate_init(size_t size, TRAPS) {

  HeapWord* obj = common_permanent_mem_allocate_noinit(size, CHECK_NULL);

  init_obj(obj, size);

  return obj;

}

HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) {

  assert(UseTLAB, "should use UseTLAB");

  HeapWord* obj = thread->tlab().allocate(size);

  if (obj != NULL) {

    return obj;

  }

  // Otherwise...

  return allocate_from_tlab_slow(thread, size);

}

void CollectedHeap::init_obj(HeapWord* obj, size_t size) {

  assert(obj != NULL, "cannot initialize NULL object");

  const size_t hs = oopDesc::header_size();

  assert(size >= hs, "unexpected object size");

  Copy::fill_to_aligned_words(obj + hs, size - hs);

}

oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) {

  debug_only(check_for_valid_allocation_state());

  assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

  assert(size >= 0, "int won't convert to size_t");

  HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL);

  post_allocation_setup_obj(klass, obj, size);

  NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

  return (oop)obj;

}

oop CollectedHeap::array_allocate(KlassHandle klass,

                                  int size,

                                  int length,

                                  TRAPS) {

  debug_only(check_for_valid_allocation_state());

  assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

  assert(size >= 0, "int won't convert to size_t");

  HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL);

  post_allocation_setup_array(klass, obj, size, length);

  NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

  return (oop)obj;

}

oop CollectedHeap::large_typearray_allocate(KlassHandle klass,

                                            int size,

                                            int length,

                                            TRAPS) {

  debug_only(check_for_valid_allocation_state());

  assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

  assert(size >= 0, "int won't convert to size_t");

  HeapWord* obj = common_mem_allocate_init(size, true, CHECK_NULL);

  post_allocation_setup_array(klass, obj, size, length);

  NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

  return (oop)obj;

}

oop CollectedHeap::permanent_obj_allocate(KlassHandle klass, int size, TRAPS) {

  oop obj = permanent_obj_allocate_no_klass_install(klass, size, CHECK_NULL);

  post_allocation_install_obj_klass(klass, obj, size);

  NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value((HeapWord*) obj,

                                                              size));

  return obj;

}

oop CollectedHeap::permanent_obj_allocate_no_klass_install(KlassHandle klass,

                                                           int size,

                                                           TRAPS) {

  debug_only(check_for_valid_allocation_state());

  assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

  assert(size >= 0, "int won't convert to size_t");

  HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL);

  post_allocation_setup_no_klass_install(klass, obj, size);

  NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

  return (oop)obj;

}

oop CollectedHeap::permanent_array_allocate(KlassHandle klass,

                                            int size,

                                            int length,

                                            TRAPS) {

  debug_only(check_for_valid_allocation_state());

  assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");

  assert(size >= 0, "int won't convert to size_t");

  HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL);

  post_allocation_setup_array(klass, obj, size, length);

  NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));

  return (oop)obj;

}

// Returns "TRUE" if "p" is a method oop in the

// current heap with high probability. NOTE: The main

// current consumers of this interface are Forte::

// and ThreadProfiler::. In these cases, the

// interpreter frame from which "p" came, may be

// under construction when sampled asynchronously, so

// the clients want to check that it represents a

// valid method before using it. Nonetheless since

// the clients do not typically lock out GC, the

// predicate is_valid_method() is not stable, so

// it is possible that by the time "p" is used, it

// is no longer valid.

inline bool CollectedHeap::is_valid_method(oop p) const {

  return

    p != NULL &&

    // Check whether it is aligned at a HeapWord boundary.

    Space::is_aligned(p) &&

    // Check whether "method" is in the allocated part of the

    // permanent generation -- this needs to be checked before

    // p->klass() below to avoid a SEGV (but see below

    // for a potential window of vulnerability).

    is_permanent((void*)p) &&

    // See if GC is active; however, there is still an

    // apparently unavoidable window after this call

    // and before the client of this interface uses "p".

    // If the client chooses not to lock out GC, then

    // it's a risk the client must accept.

    !is_gc_active() &&

    // Check that p is a methodOop.

    p->klass() == Universe::methodKlassObj();

}

#ifndef PRODUCT

inline bool

CollectedHeap::promotion_should_fail(volatile size_t* count) {

  // Access to count is not atomic; the value does not have to be exact.

  if (PromotionFailureALot) {

    const size_t gc_num = total_collections();

    const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number;

    if (elapsed_gcs >= PromotionFailureALotInterval) {

      // Test for unsigned arithmetic wrap-around.

      if (++*count >= PromotionFailureALotCount) {

        *count = 0;

        return true;

      }

    }

  }

  return false;

}

inline bool CollectedHeap::promotion_should_fail() {

  return promotion_should_fail(&_promotion_failure_alot_count);

}

inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) {

  if (PromotionFailureALot) {

    _promotion_failure_alot_gc_number = total_collections();

    *count = 0;

  }

}

inline void CollectedHeap::reset_promotion_should_fail() {

  reset_promotion_should_fail(&_promotion_failure_alot_count);

}

#endif  // #ifndef PRODUCT