61 inline HeapWord* G1CollectedHeap::attempt_allocation(size_t word_size,

    62 // See the comment in the .hpp file about the locking protocol and

    62                                               bool permit_collection_pause) {

    63 // assumptions of this method (and other related ones).

    63   HeapWord* res = NULL;

    64 inline HeapWord*

    65 G1CollectedHeap::allocate_from_cur_alloc_region(HeapRegion* cur_alloc_region,

    66                                                 size_t word_size) {

    67   assert_heap_locked_and_not_at_safepoint();

    68   assert(cur_alloc_region != NULL, "pre-condition of the method");

    69   assert(cur_alloc_region == _cur_alloc_region, "pre-condition of the method");

    70   assert(cur_alloc_region->is_young(),

    71          "we only support young current alloc regions");

    72   assert(!isHumongous(word_size), "allocate_from_cur_alloc_region() "

    73          "should not be used for humongous allocations");

    74   assert(!cur_alloc_region->isHumongous(), "Catch a regression of this bug.");

    65   assert( SafepointSynchronize::is_at_safepoint() ||

    76   assert(!cur_alloc_region->is_empty(),

    66           Heap_lock->owned_by_self(), "pre-condition of the call" );

    77          err_msg("region ["PTR_FORMAT","PTR_FORMAT"] should not be empty",

    78                  cur_alloc_region->bottom(), cur_alloc_region->end()));

    79   // This allocate method does BOT updates and we don't need them in

    80   // the young generation. This will be fixed in the near future by

    81   // CR 6994297.

    82   HeapWord* result = cur_alloc_region->allocate(word_size);

    83   if (result != NULL) {

    84     assert(is_in(result), "result should be in the heap");

    85     Heap_lock->unlock();

    68   // All humongous allocation requests should go through the slow path in

    87     // Do the dirtying after we release the Heap_lock.

    69   // attempt_allocation_slow().

    88     dirty_young_block(result, word_size);

    70   if (!isHumongous(word_size) && _cur_alloc_region != NULL) {

    89     return result;

    71     // If this allocation causes a region to become non empty,

    90   }

    72     // then we need to update our free_regions count.

    74     if (_cur_alloc_region->is_empty()) {

    92   assert_heap_locked();

    75       res = _cur_alloc_region->allocate(word_size);

    93   return NULL;

    76       if (res != NULL)

    94 }

    77         _free_regions--;

    95 

    78     } else {

    96 // See the comment in the .hpp file about the locking protocol and

    79       res = _cur_alloc_region->allocate(word_size);

    97 // assumptions of this method (and other related ones).

    98 inline HeapWord*

    99 G1CollectedHeap::attempt_allocation(size_t word_size) {

   100   assert_heap_locked_and_not_at_safepoint();

   101   assert(!isHumongous(word_size), "attempt_allocation() should not be called "

   102          "for humongous allocation requests");

   103 

   104   HeapRegion* cur_alloc_region = _cur_alloc_region;

   105   if (cur_alloc_region != NULL) {

   106     HeapWord* result = allocate_from_cur_alloc_region(cur_alloc_region,

   107                                                       word_size);

   108     if (result != NULL) {

   109       assert_heap_not_locked();

   110       return result;

    82     if (res != NULL) {

   113     assert_heap_locked();

    83       if (!SafepointSynchronize::is_at_safepoint()) {

   114 

    84         assert( Heap_lock->owned_by_self(), "invariant" );

   115     // Since we couldn't successfully allocate into it, retire the

    85         Heap_lock->unlock();

   116     // current alloc region.

    86       }

   117     retire_cur_alloc_region(cur_alloc_region);

    87       return res;

    88     }

    90   // attempt_allocation_slow will also unlock the heap lock when appropriate.

   119 

    91   return attempt_allocation_slow(word_size, permit_collection_pause);

   120   // Try to get a new region and allocate out of it

   121   HeapWord* result = replace_cur_alloc_region_and_allocate(word_size,

   122                                                       false, /* at safepoint */

   123                                                       true   /* do_dirtying */);

   124   if (result != NULL) {

   125     assert_heap_not_locked();

   126     return result;

   127   }

   128 

   129   assert_heap_locked();

   130   return NULL;

   131 }

   132 

   133 inline void

   134 G1CollectedHeap::retire_cur_alloc_region_common(HeapRegion* cur_alloc_region) {

   135   assert_heap_locked_or_at_safepoint();

   136   assert(cur_alloc_region != NULL && cur_alloc_region == _cur_alloc_region,

   137          "pre-condition of the call");

   138   assert(cur_alloc_region->is_young(),

   139          "we only support young current alloc regions");

   140 

   141   // The region is guaranteed to be young

   142   g1_policy()->add_region_to_incremental_cset_lhs(cur_alloc_region);

   143   _summary_bytes_used += cur_alloc_region->used();

   144   _cur_alloc_region = NULL;

   145 }

   146 

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

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

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

   150 // belongs to a young region.

   151 inline void

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

   153   assert_heap_not_locked();

   154 

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

   156   // have to keep calling heap_region_containing_raw() in the

   157   // asserts below.

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

   159   assert(containing_hr != NULL && start != NULL && word_size > 0,

   160          "pre-condition");

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

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

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

   164 

   165   HeapWord* end = start + word_size;

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

   167 

   168   MemRegion mr(start, end);

   169   ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr);