diff options
Diffstat (limited to 'deps/v8/src/heap/heap-write-barrier-inl.h')
| -rw-r--r-- | deps/v8/src/heap/heap-write-barrier-inl.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/deps/v8/src/heap/heap-write-barrier-inl.h b/deps/v8/src/heap/heap-write-barrier-inl.h index a1b03256af..4d48679dfa 100644 --- a/deps/v8/src/heap/heap-write-barrier-inl.h +++ b/deps/v8/src/heap/heap-write-barrier-inl.h @@ -45,10 +45,10 @@ struct MemoryChunk { static constexpr uintptr_t kFlagsOffset = kSizetSize; static constexpr uintptr_t kHeapOffset = kSizetSize + kUIntptrSize; static constexpr uintptr_t kIsExecutableBit = uintptr_t{1} << 0; - static constexpr uintptr_t kMarkingBit = uintptr_t{1} << 18; + static constexpr uintptr_t kMarkingBit = uintptr_t{1} << 17; static constexpr uintptr_t kFromPageBit = uintptr_t{1} << 3; static constexpr uintptr_t kToPageBit = uintptr_t{1} << 4; - static constexpr uintptr_t kReadOnlySpaceBit = uintptr_t{1} << 21; + static constexpr uintptr_t kReadOnlySpaceBit = uintptr_t{1} << 20; V8_INLINE static heap_internals::MemoryChunk* FromHeapObject( HeapObject object) { @@ -283,6 +283,19 @@ void WriteBarrier::MarkingFromInternalFields(JSObject host) { MarkingSlowFromInternalFields(*heap, host); } +#ifdef ENABLE_SLOW_DCHECKS +// static +template <typename T> +bool WriteBarrier::IsRequired(HeapObject host, T value) { + if (BasicMemoryChunk::FromHeapObject(host)->InYoungGeneration()) return false; + if (value.IsSmi()) return false; + if (value.IsCleared()) return false; + HeapObject target = value.GetHeapObject(); + if (ReadOnlyHeap::Contains(target)) return false; + return !IsImmortalImmovableHeapObject(target); +} +#endif + } // namespace internal } // namespace v8 |