/*

 * Copyright (c) 2001, 2016, 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

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 */

#ifndef SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP

#define SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP

#include "gc/shared/allocTracer.hpp"

#include "gc/shared/collectedHeap.hpp"

#include "gc/shared/threadLocalAllocBuffer.inline.hpp"

#include "memory/universe.hpp"

#include "oops/arrayOop.hpp"

#include "oops/oop.inline.hpp"

#include "prims/jvmtiExport.hpp"

#include "runtime/sharedRuntime.hpp"

#include "runtime/thread.inline.hpp"

#include "services/lowMemoryDetector.hpp"

#include "utilities/copy.hpp"

// Inline allocation implementations.

void CollectedHeap::post_allocation_setup_common(KlassHandle klass,

                                                 HeapWord* obj) {

  post_allocation_setup_no_klass_install(klass, obj);

  post_allocation_install_obj_klass(klass, oop(obj));

}

void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,

                                                           HeapWord* objPtr) {

  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());

  }

}

void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass,

                                                   oop obj) {

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

  obj->set_klass(klass());

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

         "missing klass");

}

// Support for jvmti and dtrace

inline void post_allocation_notify(KlassHandle klass, oop obj, int size) {

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

  LowMemoryDetector::detect_low_memory_for_collected_pools();

  // 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()->name() != NULL) {

      SharedRuntime::dtrace_object_alloc(obj, size);

    }

  }

}

void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,

                                              HeapWord* obj,

                                              int size) {

  post_allocation_setup_common(klass, obj);

  assert(Universe::is_bootstrapping() ||

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

  // notify jvmti and dtrace

  post_allocation_notify(klass, (oop)obj, size);

}

void CollectedHeap::post_allocation_setup_array(KlassHandle klass,

                                                HeapWord* obj,

                                                int length) {

  // Set array length before setting the _klass field

  // in post_allocation_setup_common() because the klass field

  // indicates that the object is parsable by concurrent GC.

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

  ((arrayOop)obj)->set_length(length);

  post_allocation_setup_common(klass, obj);

  oop new_obj = (oop)obj;

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

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

  post_allocation_notify(klass, new_obj, new_obj->size());

}

HeapWord* CollectedHeap::common_mem_allocate_noinit(KlassHandle klass, size_t size, 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

  }

  HeapWord* result = NULL;

  if (UseTLAB) {

    result = allocate_from_tlab(klass, THREAD, size);

    if (result != NULL) {

      assert(!HAS_PENDING_EXCEPTION,

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

      return result;

    }

  }

  bool gc_overhead_limit_was_exceeded = false;

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

                                          &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");

    THREAD->incr_allocated_bytes(size * HeapWordSize);

    AllocTracer::send_allocation_outside_tlab_event(klass, size * HeapWordSize);

    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(KlassHandle klass, size_t size, TRAPS) {

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

  init_obj(obj, size);

  return obj;

}

HeapWord* CollectedHeap::allocate_from_tlab(KlassHandle klass, 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(klass, 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");

  ((oop)obj)->set_klass_gap(0);

  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(klass, size, 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(klass, size, CHECK_NULL);

  post_allocation_setup_array(klass, obj, length);

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

  return (oop)obj;

}

oop CollectedHeap::array_allocate_nozero(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_noinit(klass, size, CHECK_NULL);

  ((oop)obj)->set_klass_gap(0);

  post_allocation_setup_array(klass, obj, length);

#ifndef PRODUCT

  const size_t hs = oopDesc::header_size()+1;

  Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs);

#endif

  return (oop)obj;

}

inline HeapWord* CollectedHeap::align_allocation_or_fail(HeapWord* addr,

                                                         HeapWord* end,

                                                         unsigned short alignment_in_bytes) {

  if (alignment_in_bytes <= ObjectAlignmentInBytes) {

    return addr;

  }

  assert(is_ptr_aligned(addr, HeapWordSize),

         "Address " PTR_FORMAT " is not properly aligned.", p2i(addr));

  assert(is_size_aligned(alignment_in_bytes, HeapWordSize),

         "Alignment size %u is incorrect.", alignment_in_bytes);

  size_t padding = pointer_delta(new_addr, addr);

  if (padding == 0) {

    return addr;

  }

  if (padding < CollectedHeap::min_fill_size()) {

    padding += alignment_in_bytes / HeapWordSize;

    assert(padding >= CollectedHeap::min_fill_size(),

           "alignment_in_bytes %u is expect to be larger "

           "than the minimum object size", alignment_in_bytes);

    new_addr = addr + padding;

  }

  assert(new_addr > addr, "Unexpected arithmetic overflow "

         PTR_FORMAT " not greater than " PTR_FORMAT, p2i(new_addr), p2i(addr));

  if(new_addr < end) {

    CollectedHeap::fill_with_object(addr, padding);

    return new_addr;

  } else {

    return NULL;

  }

}

#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

#endif // SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP