Line data    Source code

       1             : // Copyright 2012 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_HEAP_INCREMENTAL_MARKING_INL_H_
       6             : #define V8_HEAP_INCREMENTAL_MARKING_INL_H_
       7             : 
       8             : #include "src/heap/incremental-marking.h"
       9             : 
      10             : #include "src/heap/mark-compact-inl.h"
      11             : #include "src/isolate.h"
      12             : #include "src/objects-inl.h"
      13             : #include "src/objects/maybe-object.h"
      14             : 
      15             : namespace v8 {
      16             : namespace internal {
      17             : 
      18             : void IncrementalMarking::TransferColor(HeapObject from, HeapObject to) {
      19     3253319 :   if (atomic_marking_state()->IsBlack(to)) {
      20             :     DCHECK(black_allocation());
      21             :     return;
      22             :   }
      23             : 
      24             :   DCHECK(atomic_marking_state()->IsWhite(to));
      25     3250842 :   if (atomic_marking_state()->IsGrey(from)) {
      26             :     bool success = atomic_marking_state()->WhiteToGrey(to);
      27             :     DCHECK(success);
      28             :     USE(success);
      29     3064274 :   } else if (atomic_marking_state()->IsBlack(from)) {
      30             :     bool success = atomic_marking_state()->WhiteToBlack(to);
      31             :     DCHECK(success);
      32             :     USE(success);
      33             :   }
      34             : }
      35             : 
      36             : void IncrementalMarking::RecordWrite(HeapObject obj, ObjectSlot slot,
      37             :                                      Object value) {
      38             :   DCHECK_IMPLIES(slot.address() != kNullAddress, !HasWeakHeapObjectTag(*slot));
      39             :   DCHECK(!HasWeakHeapObjectTag(value));
      40             :   if (IsMarking() && value->IsHeapObject()) {
      41             :     RecordWriteSlow(obj, HeapObjectSlot(slot), HeapObject::cast(value));
      42             :   }
      43             : }
      44             : 
      45             : void IncrementalMarking::RecordMaybeWeakWrite(HeapObject obj,
      46             :                                               MaybeObjectSlot slot,
      47             :                                               MaybeObject value) {
      48             :   // When writing a weak reference, treat it as strong for the purposes of the
      49             :   // marking barrier.
      50     4881920 :   HeapObject heap_object;
      51     9763838 :   if (IsMarking() && value->GetHeapObject(&heap_object)) {
      52     4881917 :     RecordWriteSlow(obj, HeapObjectSlot(slot), heap_object);
      53             :   }
      54             : }
      55             : 
      56    18647905 : void IncrementalMarking::RestartIfNotMarking() {
      57    18647905 :   if (state_ == COMPLETE) {
      58        9257 :     state_ = MARKING;
      59        9257 :     if (FLAG_trace_incremental_marking) {
      60             :       heap()->isolate()->PrintWithTimestamp(
      61           0 :           "[IncrementalMarking] Restarting (new grey objects)\n");
      62             :     }
      63             :   }
      64    18647905 : }
      65             : 
      66             : }  // namespace internal
      67             : }  // namespace v8
      68             : 
      69             : #endif  // V8_HEAP_INCREMENTAL_MARKING_INL_H_