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 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * published by the Free Software Foundation.

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  * 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).

  *

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  * 2 along with this work; if not, write to the Free Software Foundation,

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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP

 #include "gc_implementation/g1/concurrentMark.hpp"

 #include "gc_implementation/g1/g1CollectedHeap.hpp"

 #include "gc_implementation/g1/g1AllocRegion.inline.hpp"

 #include "gc_implementation/g1/g1CollectorPolicy.hpp"

 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"

 #include "gc_implementation/g1/heapRegionManager.inline.hpp"

 #include "gc_implementation/g1/heapRegionSet.inline.hpp"

 #include "runtime/orderAccess.inline.hpp"

 #include "utilities/taskqueue.hpp"

 // Inline functions for G1CollectedHeap

 // Return the region with the given index. It assumes the index is valid.

 inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrm.at(index); }

 inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const {

   assert(is_in_reserved(addr),

          err_msg("Cannot calculate region index for address "PTR_FORMAT" that is outside of the heap ["PTR_FORMAT", "PTR_FORMAT")",

                  p2i(addr), p2i(_reserved.start()), p2i(_reserved.end())));

   return (uint)(pointer_delta(addr, _reserved.start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes);

 }

 inline HeapWord* G1CollectedHeap::bottom_addr_for_region(uint index) const {

   return _hrm.reserved().start() + index * HeapRegion::GrainWords;

 }

 template <class T>

 inline HeapRegion* G1CollectedHeap::heap_region_containing_raw(const T addr) const {

   assert(addr != NULL, "invariant");

   assert(is_in_g1_reserved((const void*) addr),

       err_msg("Address "PTR_FORMAT" is outside of the heap ranging from ["PTR_FORMAT" to "PTR_FORMAT")",

           p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end())));

   return _hrm.addr_to_region((HeapWord*) addr);

 }

 template <class T>

 inline HeapRegion* G1CollectedHeap::heap_region_containing(const T addr) const {

   HeapRegion* hr = heap_region_containing_raw(addr);

   if (hr->continuesHumongous()) {

     return hr->humongous_start_region();

   }

   return hr;

 }

 inline void G1CollectedHeap::reset_gc_time_stamp() {

   _gc_time_stamp = 0;

   OrderAccess::fence();

   // Clear the cached CSet starting regions and time stamps.

   // Their validity is dependent on the GC timestamp.

   clear_cset_start_regions();

 }

 inline void G1CollectedHeap::increment_gc_time_stamp() {

   ++_gc_time_stamp;

   OrderAccess::fence();

 }

 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {

   _old_set.remove(hr);

 }

 inline bool G1CollectedHeap::obj_in_cs(oop obj) {

   HeapRegion* r = _hrm.addr_to_region((HeapWord*) obj);

   return r != NULL && r->in_collection_set();

 }

 inline HeapWord* G1CollectedHeap::attempt_allocation(size_t word_size,

                                                      unsigned int* gc_count_before_ret,

                                                      int* gclocker_retry_count_ret) {

   assert_heap_not_locked_and_not_at_safepoint();

   assert(!isHumongous(word_size), "attempt_allocation() should not "

          "be called for humongous allocation requests");

   AllocationContext_t context = AllocationContext::current();

   HeapWord* result = _allocator->mutator_alloc_region(context)->attempt_allocation(word_size,

                                                                                    false /* bot_updates */);

   if (result == NULL) {

     result = attempt_allocation_slow(word_size,

                                      context,

                                      gc_count_before_ret,

                                      gclocker_retry_count_ret);

   }

   assert_heap_not_locked();

   if (result != NULL) {

     dirty_young_block(result, word_size);

   }

   return result;

 }

 inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t word_size,

                                                               AllocationContext_t context) {

   assert(!isHumongous(word_size),

          "we should not be seeing humongous-size allocations in this path");

   HeapWord* result = _allocator->survivor_gc_alloc_region(context)->attempt_allocation(word_size,

                                                                                        false /* bot_updates */);

   if (result == NULL) {

     MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);

     result = _allocator->survivor_gc_alloc_region(context)->attempt_allocation_locked(word_size,

                                                                                       false /* bot_updates */);

   }

   if (result != NULL) {

     dirty_young_block(result, word_size);

   }

   return result;

 }

 inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size,

                                                          AllocationContext_t context) {

   assert(!isHumongous(word_size),

          "we should not be seeing humongous-size allocations in this path");

   HeapWord* result = _allocator->old_gc_alloc_region(context)->attempt_allocation(word_size,

                                                                                   true /* bot_updates */);

   if (result == NULL) {

     MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);

     result = _allocator->old_gc_alloc_region(context)->attempt_allocation_locked(word_size,

                                                                                  true /* bot_updates */);

   }

   return result;

 }

 // It dirties the cards that cover the block so that so that the post

 // write barrier never queues anything when updating objects on this

 // block. It is assumed (and in fact we assert) that the block

 // belongs to a young region.

 inline void

 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {

   assert_heap_not_locked();

   // Assign the containing region to containing_hr so that we don't

   // have to keep calling heap_region_containing_raw() in the

   // asserts below.

   DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);)

   assert(word_size > 0, "pre-condition");

   assert(containing_hr->is_in(start), "it should contain start");

   assert(containing_hr->is_young(), "it should be young");

   assert(!containing_hr->isHumongous(), "it should not be humongous");

   HeapWord* end = start + word_size;

   assert(containing_hr->is_in(end - 1), "it should also contain end - 1");

   MemRegion mr(start, end);

   g1_barrier_set()->g1_mark_as_young(mr);

 }

 inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const {

   return _task_queues->queue(i);

 }

 inline bool G1CollectedHeap::isMarkedPrev(oop obj) const {

   return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj);

 }

 inline bool G1CollectedHeap::isMarkedNext(oop obj) const {

   return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj);

 }

 // This is a fast test on whether a reference points into the

 // collection set or not. Assume that the reference

 // points into the heap.

 inline bool G1CollectedHeap::is_in_cset(oop obj) {

   bool ret = _in_cset_fast_test.is_in_cset((HeapWord*)obj);

   // let's make sure the result is consistent with what the slower

   // test returns

   assert( ret || !obj_in_cs(obj), "sanity");

   assert(!ret ||  obj_in_cs(obj), "sanity");

   return ret;

 }

 bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) {

   return _in_cset_fast_test.is_in_cset_or_humongous((HeapWord*)obj);

 }

 G1CollectedHeap::in_cset_state_t G1CollectedHeap::in_cset_state(const oop obj) {

   return _in_cset_fast_test.at((HeapWord*)obj);

 }

 void G1CollectedHeap::register_humongous_region_with_in_cset_fast_test(uint index) {

   _in_cset_fast_test.set_humongous(index);

 }

 #ifndef PRODUCT

 // Support for G1EvacuationFailureALot

 inline bool

 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young,

                                                      bool during_initial_mark,

                                                      bool during_marking) {

   bool res = false;

   if (during_marking) {

     res |= G1EvacuationFailureALotDuringConcMark;

   }

   if (during_initial_mark) {

     res |= G1EvacuationFailureALotDuringInitialMark;

   }

   if (gcs_are_young) {

     res |= G1EvacuationFailureALotDuringYoungGC;

   } else {

     // GCs are mixed

     res |= G1EvacuationFailureALotDuringMixedGC;

   }

   return res;

 }

 inline void

 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {

   if (G1EvacuationFailureALot) {

     // Note we can't assert that _evacuation_failure_alot_for_current_gc

     // is clear here. It may have been set during a previous GC but that GC

     // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to

     // trigger an evacuation failure and clear the flags and and counts.

     // Check if we have gone over the interval.

     const size_t gc_num = total_collections();

     const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;

     _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);

     // Now check if G1EvacuationFailureALot is enabled for the current GC type.

     const bool gcs_are_young = g1_policy()->gcs_are_young();

     const bool during_im = g1_policy()->during_initial_mark_pause();

     const bool during_marking = mark_in_progress();

     _evacuation_failure_alot_for_current_gc &=

       evacuation_failure_alot_for_gc_type(gcs_are_young,

                                           during_im,

                                           during_marking);

   }

 }

 inline bool G1CollectedHeap::evacuation_should_fail() {

   if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {

     return false;

   }

   // G1EvacuationFailureALot is in effect for current GC

   // Access to _evacuation_failure_alot_count is not atomic;

   // the value does not have to be exact.

   if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {

     return false;

   }

   _evacuation_failure_alot_count = 0;

   return true;

 }

 inline void G1CollectedHeap::reset_evacuation_should_fail() {

   if (G1EvacuationFailureALot) {

     _evacuation_failure_alot_gc_number = total_collections();

     _evacuation_failure_alot_count = 0;

     _evacuation_failure_alot_for_current_gc = false;

   }

 }

 #endif  // #ifndef PRODUCT

 inline bool G1CollectedHeap::is_in_young(const oop obj) {

   if (obj == NULL) {

     return false;

   }

   return heap_region_containing(obj)->is_young();

 }

 // We don't need barriers for initializing stores to objects

 // in the young gen: for the SATB pre-barrier, there is no

 // pre-value that needs to be remembered; for the remembered-set

 // update logging post-barrier, we don't maintain remembered set

 // information for young gen objects.

 inline bool G1CollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {

   return is_in_young(new_obj);

 }

 inline bool G1CollectedHeap::is_obj_dead(const oop obj) const {

   if (obj == NULL) {

     return false;

   }

   return is_obj_dead(obj, heap_region_containing(obj));

 }

 inline bool G1CollectedHeap::is_obj_ill(const oop obj) const {

   if (obj == NULL) {

     return false;

   }

   return is_obj_ill(obj, heap_region_containing(obj));

 }

 inline void G1CollectedHeap::set_humongous_is_live(oop obj) {

   uint region = addr_to_region((HeapWord*)obj);

   // We not only set the "live" flag in the humongous_is_live table, but also

   // reset the entry in the _in_cset_fast_test table so that subsequent references

   // to the same humongous object do not go into the slow path again.

   // This is racy, as multiple threads may at the same time enter here, but this

   // is benign.

   // During collection we only ever set the "live" flag, and only ever clear the

   // entry in the in_cset_fast_table.

   // We only ever evaluate the contents of these tables (in the VM thread) after

   // having synchronized the worker threads with the VM thread, or in the same

   // thread (i.e. within the VM thread).

   if (!_humongous_is_live.is_live(region)) {

     _humongous_is_live.set_live(region);

     _in_cset_fast_test.clear_humongous(region);

   }

 }

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP