/*

 * Copyright (c) 2015, 2019, 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 "precompiled.hpp"

#include "gc/shared/gcHeapSummary.hpp"

#include "gc/shared/suspendibleThreadSet.hpp"

#include "gc/z/zCollectedHeap.hpp"

#include "gc/z/zGlobals.hpp"

#include "gc/z/zHeap.inline.hpp"

#include "gc/z/zNMethod.hpp"

#include "gc/z/zServiceability.hpp"

#include "gc/z/zStat.hpp"

#include "gc/z/zUtils.inline.hpp"

#include "memory/universe.hpp"

#include "runtime/mutexLocker.hpp"

ZCollectedHeap* ZCollectedHeap::heap() {

  CollectedHeap* heap = Universe::heap();

  assert(heap != NULL, "Uninitialized access to ZCollectedHeap::heap()");

  assert(heap->kind() == CollectedHeap::Z, "Invalid name");

  return (ZCollectedHeap*)heap;

}

ZCollectedHeap::ZCollectedHeap() :

    _soft_ref_policy(),

    _barrier_set(),

    _initialize(&_barrier_set),

    _heap(),

    _director(new ZDirector()),

    _driver(new ZDriver()),

    _uncommitter(new ZUncommitter()),

    _stat(new ZStat()),

    _runtime_workers() {}

CollectedHeap::Name ZCollectedHeap::kind() const {

  return CollectedHeap::Z;

}

const char* ZCollectedHeap::name() const {

  return ZName;

}

jint ZCollectedHeap::initialize() {

  if (!_heap.is_initialized()) {

    return JNI_ENOMEM;

  }

  initialize_reserved_region((HeapWord*)ZAddressReservedStart,

                             (HeapWord*)ZAddressReservedEnd);

  return JNI_OK;

}

void ZCollectedHeap::initialize_serviceability() {

  _heap.serviceability_initialize();

}

void ZCollectedHeap::stop() {

  _director->stop();

  _driver->stop();

  _uncommitter->stop();

  _stat->stop();

}

SoftRefPolicy* ZCollectedHeap::soft_ref_policy() {

  return &_soft_ref_policy;

}

size_t ZCollectedHeap::max_capacity() const {

  return _heap.max_capacity();

}

size_t ZCollectedHeap::capacity() const {

  return _heap.capacity();

}

size_t ZCollectedHeap::used() const {

  return _heap.used();

}

size_t ZCollectedHeap::unused() const {

  return _heap.unused();

}

bool ZCollectedHeap::is_maximal_no_gc() const {

  // Not supported

  ShouldNotReachHere();

  return false;

}

bool ZCollectedHeap::is_in(const void* p) const {

  return _heap.is_in((uintptr_t)p);

}

uint32_t ZCollectedHeap::hash_oop(oop obj) const {

  return _heap.hash_oop(obj);

}

HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) {

  const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size));

  const uintptr_t addr = _heap.alloc_tlab(size_in_bytes);

  if (addr != 0) {

    *actual_size = requested_size;

  }

  return (HeapWord*)addr;

}

HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) {

  const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size));

  return (HeapWord*)_heap.alloc_object(size_in_bytes);

}

MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,

                                                             size_t size,

                                                             Metaspace::MetadataType mdtype) {

  MetaWord* result;

  // Start asynchronous GC

  collect(GCCause::_metadata_GC_threshold);

  // Expand and retry allocation

  result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);

  if (result != NULL) {

    return result;

  }

  // Start synchronous GC

  collect(GCCause::_metadata_GC_clear_soft_refs);

  // Retry allocation

  result = loader_data->metaspace_non_null()->allocate(size, mdtype);

  if (result != NULL) {

    return result;

  }

  // Expand and retry allocation

  result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);

  if (result != NULL) {

    return result;

  }

  // Out of memory

  return NULL;

}

void ZCollectedHeap::collect(GCCause::Cause cause) {

  _driver->collect(cause);

}

void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) {

  // These collection requests are ignored since ZGC can't run a synchronous

  // GC cycle from within the VM thread. This is considered benign, since the

  // only GC causes coming in here should be heap dumper and heap inspector.

  // However, neither the heap dumper nor the heap inspector really need a GC

  // to happen, but the result of their heap iterations might in that case be

  // less accurate since they might include objects that would otherwise have

  // been collected by a GC.

  assert(Thread::current()->is_VM_thread(), "Should be the VM thread");

  guarantee(cause == GCCause::_heap_dump ||

            cause == GCCause::_heap_inspection, "Invalid cause");

}

void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) {

  // Not supported

  ShouldNotReachHere();

}

bool ZCollectedHeap::supports_tlab_allocation() const {

  return true;

}

size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const {

  return _heap.tlab_capacity();

}

size_t ZCollectedHeap::tlab_used(Thread* ignored) const {

  return _heap.tlab_used();

}

size_t ZCollectedHeap::max_tlab_size() const {

  return _heap.max_tlab_size();

}

size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const {

  return _heap.unsafe_max_tlab_alloc();

}

bool ZCollectedHeap::can_elide_tlab_store_barriers() const {

  return false;

}

bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {

  // Not supported

  ShouldNotReachHere();

  return true;

}

bool ZCollectedHeap::card_mark_must_follow_store() const {

  // Not supported

  ShouldNotReachHere();

  return false;

}

GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() {

  return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager());

}

GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() {

  return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool());

}

void ZCollectedHeap::object_iterate(ObjectClosure* cl) {

  _heap.object_iterate(cl, true /* visit_weaks */);

}

void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) {

  _heap.object_iterate(cl, true /* visit_weaks */);

}

HeapWord* ZCollectedHeap::block_start(const void* addr) const {

  return (HeapWord*)_heap.block_start((uintptr_t)addr);

}

bool ZCollectedHeap::block_is_obj(const HeapWord* addr) const {

  return _heap.block_is_obj((uintptr_t)addr);

}

void ZCollectedHeap::register_nmethod(nmethod* nm) {

  ZNMethod::register_nmethod(nm);

}

void ZCollectedHeap::unregister_nmethod(nmethod* nm) {

  ZNMethod::unregister_nmethod(nm);

}

void ZCollectedHeap::flush_nmethod(nmethod* nm) {

  ZNMethod::flush_nmethod(nm);

}

void ZCollectedHeap::verify_nmethod(nmethod* nm) {

  // Does nothing

}

WorkGang* ZCollectedHeap::get_safepoint_workers() {

  return _runtime_workers.workers();

}

jlong ZCollectedHeap::millis_since_last_gc() {

  return ZStatCycle::time_since_last() / MILLIUNITS;

}

void ZCollectedHeap::gc_threads_do(ThreadClosure* tc) const {

  tc->do_thread(_director);

  tc->do_thread(_driver);

  tc->do_thread(_uncommitter);

  tc->do_thread(_stat);

  _heap.worker_threads_do(tc);

  _runtime_workers.threads_do(tc);

}

VirtualSpaceSummary ZCollectedHeap::create_heap_space_summary() {

  const size_t capacity_in_words = capacity() / HeapWordSize;

  const size_t max_capacity_in_words = max_capacity() / HeapWordSize;

  return VirtualSpaceSummary(reserved_region().start(),

                             reserved_region().start() + capacity_in_words,

                             reserved_region().start() + max_capacity_in_words);

}

void ZCollectedHeap::safepoint_synchronize_begin() {

  SuspendibleThreadSet::synchronize();

}

void ZCollectedHeap::safepoint_synchronize_end() {

  SuspendibleThreadSet::desynchronize();

}

void ZCollectedHeap::prepare_for_verify() {

  // Does nothing

}

void ZCollectedHeap::print_on(outputStream* st) const {

  _heap.print_on(st);

}

void ZCollectedHeap::print_on_error(outputStream* st) const {

  CollectedHeap::print_on_error(st);

  st->print_cr("Address Space");

  st->print_cr( "     Start:             " PTR_FORMAT, ZAddressSpaceStart);

  st->print_cr( "     End:               " PTR_FORMAT, ZAddressSpaceEnd);

  st->print_cr( "     Size:              " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressSpaceSize, ZAddressSpaceSize);

  st->print_cr( "Heap");

  st->print_cr( "     GlobalPhase:       %u", ZGlobalPhase);

  st->print_cr( "     GlobalSeqNum:      %u", ZGlobalSeqNum);

  st->print_cr( "     Offset Max:        " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressOffsetMax, ZAddressOffsetMax);

  st->print_cr( "     Page Size Small:   " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeSmall, ZPageSizeSmall);

  st->print_cr( "     Page Size Medium:  " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeMedium, ZPageSizeMedium);

  st->print_cr( "Metadata Bits");

  st->print_cr( "     Good:              " PTR_FORMAT, ZAddressGoodMask);

  st->print_cr( "     Bad:               " PTR_FORMAT, ZAddressBadMask);

  st->print_cr( "     WeakBad:           " PTR_FORMAT, ZAddressWeakBadMask);

  st->print_cr( "     Marked:            " PTR_FORMAT, ZAddressMetadataMarked);

  st->print_cr( "     Remapped:          " PTR_FORMAT, ZAddressMetadataRemapped);

}

void ZCollectedHeap::print_extended_on(outputStream* st) const {

  _heap.print_extended_on(st);

}

void ZCollectedHeap::print_gc_threads_on(outputStream* st) const {

  _director->print_on(st);

  st->cr();

  _driver->print_on(st);

  st->cr();

  _uncommitter->print_on(st);

  st->cr();

  _stat->print_on(st);

  st->cr();

  _heap.print_worker_threads_on(st);

  _runtime_workers.print_threads_on(st);

}

void ZCollectedHeap::print_tracing_info() const {

  // Does nothing

}

void ZCollectedHeap::verify(VerifyOption option /* ignored */) {

  _heap.verify();

}

bool ZCollectedHeap::is_oop(oop object) const {

  return CollectedHeap::is_oop(object) && _heap.is_oop(object);

}