Line data    Source code

       1             : // Copyright 2018 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_OBJECTS_EMBEDDER_DATA_ARRAY_H_
       6             : #define V8_OBJECTS_EMBEDDER_DATA_ARRAY_H_
       7             : 
       8             : #include "src/globals.h"
       9             : #include "src/maybe-handles.h"
      10             : #include "src/objects/heap-object.h"
      11             : 
      12             : // Has to be the last include (doesn't have include guards):
      13             : #include "src/objects/object-macros.h"
      14             : 
      15             : namespace v8 {
      16             : namespace internal {
      17             : 
      18             : // This is a storage array for embedder data fields stored in native context.
      19             : // It's basically an "array of EmbedderDataSlots".
      20             : // Note, if the pointer compression is enabled the embedder data slot also
      21             : // contains a raw data part in addition to tagged part.
      22             : class EmbedderDataArray : public HeapObject {
      23             :  public:
      24             :   // [length]: length of the array in an embedder data slots.
      25             :   V8_INLINE int length() const;
      26             :   V8_INLINE void set_length(int value);
      27             : 
      28             :   DECL_CAST(EmbedderDataArray)
      29             : 
      30             : // Layout description.
      31             : #define EMBEDDER_DATA_ARRAY_FIELDS(V) \
      32             :   V(kLengthOffset, kTaggedSize)       \
      33             :   V(kHeaderSize, 0)
      34             : 
      35             :   DEFINE_FIELD_OFFSET_CONSTANTS(HeapObject::kHeaderSize,
      36             :                                 EMBEDDER_DATA_ARRAY_FIELDS)
      37             : #undef EMBEDDER_DATA_ARRAY_FIELDS
      38             : 
      39             :   // Garbage collection support.
      40             :   static constexpr int SizeFor(int length) {
      41      768992 :     return kHeaderSize + length * kEmbedderDataSlotSize;
      42             :   }
      43             : 
      44             :   // Returns a grown copy if the index is bigger than the array's length.
      45             :   static Handle<EmbedderDataArray> EnsureCapacity(
      46             :       Isolate* isolate, Handle<EmbedderDataArray> array, int index);
      47             : 
      48             :   // Code Generation support.
      49      583892 :   static constexpr int OffsetOfElementAt(int index) { return SizeFor(index); }
      50             : 
      51             :   // Address of the first slot.
      52             :   V8_INLINE Address slots_start();
      53             : 
      54             :   // Address of the one past last slot.
      55             :   V8_INLINE Address slots_end();
      56             : 
      57             :   // Dispatched behavior.
      58             :   DECL_PRINTER(EmbedderDataArray)
      59             :   DECL_VERIFIER(EmbedderDataArray)
      60             : 
      61             :   class BodyDescriptor;
      62             : 
      63             :   static const int kMaxSize = kMaxRegularHeapObjectSize;
      64             :   static constexpr int kMaxLength =
      65             :       (kMaxSize - kHeaderSize) / kEmbedderDataSlotSize;
      66             : 
      67             :  private:
      68             :   STATIC_ASSERT(kHeaderSize == Internals::kFixedArrayHeaderSize);
      69             : 
      70       57576 :   OBJECT_CONSTRUCTORS(EmbedderDataArray, HeapObject);
      71             : };
      72             : 
      73             : }  // namespace internal
      74             : }  // namespace v8
      75             : 
      76             : #include "src/objects/object-macros-undef.h"
      77             : 
      78             : #endif  // V8_OBJECTS_EMBEDDER_DATA_ARRAY_H_