/*
 * Copyright (c) 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "gc/g1/g1CollectedHeap.hpp"
#include "gc/g1/g1CollectorPolicy.hpp"
#include "gc/g1/g1GC.hpp"
#include "gc/g1/g1GCServicabilitySupport.hpp"
#include "gc/g1/suspendibleThreadSet.hpp"

CollectedHeap* G1GC::create_heap() {
  G1CollectorPolicy* policy = new G1CollectorPolicy();
  policy->initialize_all();
  return new G1CollectedHeap(policy);
}

void G1GC::initialize_flags() {
  assert(UseG1GC, "Error");
#if defined(COMPILER1) || INCLUDE_JVMCI
  FastTLABRefill = false;
#endif
  FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
  if (ParallelGCThreads == 0) {
    assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
    vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
  }

#if INCLUDE_ALL_GCS
  if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
    FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
  }
#endif

  // MarkStackSize will be set (if it hasn't been set by the user)
  // when concurrent marking is initialized.
  // Its value will be based upon the number of parallel marking threads.
  // But we do set the maximum mark stack size here.
  if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
    FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
  }

  if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
    // In G1, we want the default GC overhead goal to be higher than
    // it is for PS, or the heap might be expanded too aggressively.
    // We set it here to ~8%.
    FLAG_SET_DEFAULT(GCTimeRatio, 12);
  }

  // Below, we might need to calculate the pause time interval based on
  // the pause target. When we do so we are going to give G1 maximum
  // flexibility and allow it to do pauses when it needs to. So, we'll
  // arrange that the pause interval to be pause time target + 1 to
  // ensure that a) the pause time target is maximized with respect to
  // the pause interval and b) we maintain the invariant that pause
  // time target < pause interval. If the user does not want this
  // maximum flexibility, they will have to set the pause interval
  // explicitly.

  if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
    // The default pause time target in G1 is 200ms
    FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
  }

  // Then, if the interval parameter was not set, set it according to
  // the pause time target (this will also deal with the case when the
  // pause time target is the default value).
  if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
    FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
  }

  log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
}

size_t G1GC::conservative_max_heap_alignment() {
  return HeapRegion::max_region_size();
}

GCServicabilitySupport* G1GC::create_servicability_support() {
  return new G1GCServicabilitySupport();
}

void G1GC::synchronize_safepoint() {
  SuspendibleThreadSet::synchronize();
}

void G1GC::desynchronize_safepoint() {
  SuspendibleThreadSet::desynchronize();
}