/*

 * Copyright (c) 1999, 2018, 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_THREADLOCALALLOCBUFFER_INLINE_HPP

#define SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_INLINE_HPP

#include "gc/shared/collectedHeap.hpp"

#include "gc/shared/threadLocalAllocBuffer.hpp"

#include "logging/log.hpp"

#include "runtime/thread.hpp"

#include "utilities/copy.hpp"

inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {

  invariants();

  HeapWord* obj = top();

  if (pointer_delta(end(), obj) >= size) {

    // successful thread-local allocation

#ifdef ASSERT

    // Skip mangling the space corresponding to the object header to

    // ensure that the returned space is not considered parsable by

    // any concurrent GC thread.

    size_t hdr_size = oopDesc::header_size();

    Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal);

#endif // ASSERT

    // This addition is safe because we know that top is

    // at least size below end, so the add can't wrap.

    set_top(obj + size);

    invariants();

    return obj;

  }

  return NULL;

}

inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {

  // Compute the size for the new TLAB.

  // The "last" tlab may be smaller to reduce fragmentation.

  // unsafe_max_tlab_alloc is just a hint.

  const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(thread()) / HeapWordSize;

  size_t new_tlab_size = MIN3(available_size, desired_size() + align_object_size(obj_size), max_size());

  // Make sure there's enough room for object and filler int[].

  if (new_tlab_size < compute_min_size(obj_size)) {

    // If there isn't enough room for the allocation, return failure.

    log_trace(gc, tlab)("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ") returns failure",

                        obj_size);

    return 0;

  }

  log_trace(gc, tlab)("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ") returns " SIZE_FORMAT,

                      obj_size, new_tlab_size);

  return new_tlab_size;

}

inline size_t ThreadLocalAllocBuffer::compute_min_size(size_t obj_size) {

  const size_t aligned_obj_size = align_object_size(obj_size);

  const size_t size_with_reserve = aligned_obj_size + alignment_reserve();

  return MAX2(size_with_reserve, heap_word_size(MinTLABSize));

}

void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) {

  // Raise size required to bypass TLAB next time. Why? Else there's

  // a risk that a thread that repeatedly allocates objects of one

  // size will get stuck on this slow path.

  set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment());

  _slow_allocations++;

  log_develop_trace(gc, tlab)("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]"

                              " obj: " SIZE_FORMAT

                              " free: " SIZE_FORMAT

                              " waste: " SIZE_FORMAT,

                              "slow", p2i(thread()), thread()->osthread()->thread_id(),

                              obj_size, free(), refill_waste_limit());

}

#endif // SHARE_VM_GC_SHARED_THREADLOCALALLOCBUFFER_INLINE_HPP