v8::internal::StaticVisitorBase Class Reference

#include <objects-visiting.h>

Inheritance diagram for v8::internal::StaticVisitorBase:

Collaboration diagram for v8::internal::StaticVisitorBase:

Public Types
enum	VisitorId {   kVisitorIdCount , kVisitDataObject = kVisitDataObject2 , kVisitJSObject = kVisitJSObject2 , kVisitStruct = kVisitStruct2 ,   kMinObjectSizeInWords = 2 }

Public Member Functions
	STATIC_ASSERT (kVisitorIdCount<=256)

Static Public Member Functions
static VisitorId	GetVisitorId (int instance_type, int instance_size)
static VisitorId	GetVisitorId (Map *map)
static VisitorId	GetVisitorIdForSize (VisitorId base, VisitorId generic, int object_size)

Detailed Description

Definition at line 24 of file objects-visiting.h.

Member Enumeration Documentation

VisitorId

enum v8::internal::StaticVisitorBase::VisitorId

Enumerator
kVisitorIdCount
kVisitDataObject
kVisitJSObject
kVisitStruct
kMinObjectSizeInWords

Definition at line 91 of file objects-visiting.h.

                 {
#define VISITOR_ID_ENUM_DECL(id) kVisit##id,
    VISITOR_ID_LIST(VISITOR_ID_ENUM_DECL)
#undef VISITOR_ID_ENUM_DECL
    kVisitorIdCount,
    kVisitDataObject = kVisitDataObject2,
    kVisitJSObject = kVisitJSObject2,
    kVisitStruct = kVisitStruct2,
    kMinObjectSizeInWords = 2
  };

Member Function Documentation

GetVisitorId() [1/2]

StaticVisitorBase::VisitorId v8::internal::StaticVisitorBase::GetVisitorId ( int  instance_type, int  instance_size  )

static

Definition at line 13 of file objects-visiting.cc.

                                          {
  if (instance_type < FIRST_NONSTRING_TYPE) {
    switch (instance_type & kStringRepresentationMask) {
      case kSeqStringTag:
        if ((instance_type & kStringEncodingMask) == kOneByteStringTag) {
          return kVisitSeqOneByteString;
        } else {
          return kVisitSeqTwoByteString;
        }
 
      case kConsStringTag:
        if (IsShortcutCandidate(instance_type)) {
          return kVisitShortcutCandidate;
        } else {
          return kVisitConsString;
        }
 
      case kSlicedStringTag:
        return kVisitSlicedString;
 
      case kExternalStringTag:
        return GetVisitorIdForSize(kVisitDataObject, kVisitDataObjectGeneric,
                                   instance_size);
    }
    UNREACHABLE();
  }
 
  switch (instance_type) {
    case BYTE_ARRAY_TYPE:
      return kVisitByteArray;
 
    case FREE_SPACE_TYPE:
      return kVisitFreeSpace;
 
    case FIXED_ARRAY_TYPE:
      return kVisitFixedArray;
 
    case FIXED_DOUBLE_ARRAY_TYPE:
      return kVisitFixedDoubleArray;
 
    case CONSTANT_POOL_ARRAY_TYPE:
      return kVisitConstantPoolArray;
 
    case ODDBALL_TYPE:
      return kVisitOddball;
 
    case MAP_TYPE:
      return kVisitMap;
 
    case CODE_TYPE:
      return kVisitCode;
 
    case CELL_TYPE:
      return kVisitCell;
 
    case PROPERTY_CELL_TYPE:
      return kVisitPropertyCell;
 
    case JS_SET_TYPE:
      return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
                                 JSSet::kSize);
 
    case JS_MAP_TYPE:
      return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
                                 JSMap::kSize);
 
    case JS_WEAK_MAP_TYPE:
    case JS_WEAK_SET_TYPE:
      return kVisitJSWeakCollection;
 
    case JS_REGEXP_TYPE:
      return kVisitJSRegExp;
 
    case SHARED_FUNCTION_INFO_TYPE:
      return kVisitSharedFunctionInfo;
 
    case JS_PROXY_TYPE:
      return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
                                 JSProxy::kSize);
 
    case JS_FUNCTION_PROXY_TYPE:
      return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
                                 JSFunctionProxy::kSize);
 
    case FOREIGN_TYPE:
      return GetVisitorIdForSize(kVisitDataObject, kVisitDataObjectGeneric,
                                 Foreign::kSize);
 
    case SYMBOL_TYPE:
      return kVisitSymbol;
 
    case FILLER_TYPE:
      return kVisitDataObjectGeneric;
 
    case JS_ARRAY_BUFFER_TYPE:
      return kVisitJSArrayBuffer;
 
    case JS_TYPED_ARRAY_TYPE:
      return kVisitJSTypedArray;
 
    case JS_DATA_VIEW_TYPE:
      return kVisitJSDataView;
 
    case JS_OBJECT_TYPE:
    case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
    case JS_GENERATOR_OBJECT_TYPE:
    case JS_MODULE_TYPE:
    case JS_VALUE_TYPE:
    case JS_DATE_TYPE:
    case JS_ARRAY_TYPE:
    case JS_GLOBAL_PROXY_TYPE:
    case JS_GLOBAL_OBJECT_TYPE:
    case JS_BUILTINS_OBJECT_TYPE:
    case JS_MESSAGE_OBJECT_TYPE:
    case JS_SET_ITERATOR_TYPE:
    case JS_MAP_ITERATOR_TYPE:
      return GetVisitorIdForSize(kVisitJSObject, kVisitJSObjectGeneric,
                                 instance_size);
 
    case JS_FUNCTION_TYPE:
      return kVisitJSFunction;
 
    case HEAP_NUMBER_TYPE:
    case MUTABLE_HEAP_NUMBER_TYPE:
#define EXTERNAL_ARRAY_CASE(Type, type, TYPE, ctype, size) \
  case EXTERNAL_##TYPE##_ARRAY_TYPE:
 
      TYPED_ARRAYS(EXTERNAL_ARRAY_CASE)
      return GetVisitorIdForSize(kVisitDataObject, kVisitDataObjectGeneric,
                                 instance_size);
#undef EXTERNAL_ARRAY_CASE
 
    case FIXED_UINT8_ARRAY_TYPE:
    case FIXED_INT8_ARRAY_TYPE:
    case FIXED_UINT16_ARRAY_TYPE:
    case FIXED_INT16_ARRAY_TYPE:
    case FIXED_UINT32_ARRAY_TYPE:
    case FIXED_INT32_ARRAY_TYPE:
    case FIXED_FLOAT32_ARRAY_TYPE:
    case FIXED_UINT8_CLAMPED_ARRAY_TYPE:
      return kVisitFixedTypedArray;
 
    case FIXED_FLOAT64_ARRAY_TYPE:
      return kVisitFixedFloat64Array;
 
#define MAKE_STRUCT_CASE(NAME, Name, name) case NAME##_TYPE:
      STRUCT_LIST(MAKE_STRUCT_CASE)
#undef MAKE_STRUCT_CASE
      if (instance_type == ALLOCATION_SITE_TYPE) {
        return kVisitAllocationSite;
      }
 
      return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
                                 instance_size);
 
    default:
      UNREACHABLE();
      return kVisitorIdCount;
  }
}

References v8::internal::ALLOCATION_SITE_TYPE, v8::internal::BYTE_ARRAY_TYPE, v8::internal::CELL_TYPE, v8::internal::CODE_TYPE, v8::internal::CONSTANT_POOL_ARRAY_TYPE, EXTERNAL_ARRAY_CASE, v8::internal::FILLER_TYPE, v8::internal::FIRST_NONSTRING_TYPE, v8::internal::FIXED_ARRAY_TYPE, v8::internal::FIXED_DOUBLE_ARRAY_TYPE, v8::internal::FIXED_FLOAT32_ARRAY_TYPE, v8::internal::FIXED_FLOAT64_ARRAY_TYPE, v8::internal::FIXED_INT16_ARRAY_TYPE, v8::internal::FIXED_INT32_ARRAY_TYPE, v8::internal::FIXED_INT8_ARRAY_TYPE, v8::internal::FIXED_UINT16_ARRAY_TYPE, v8::internal::FIXED_UINT32_ARRAY_TYPE, v8::internal::FIXED_UINT8_ARRAY_TYPE, v8::internal::FIXED_UINT8_CLAMPED_ARRAY_TYPE, v8::internal::FOREIGN_TYPE, v8::internal::FREE_SPACE_TYPE, GetVisitorIdForSize(), v8::internal::HEAP_NUMBER_TYPE, v8::internal::IsShortcutCandidate(), v8::internal::JS_ARRAY_BUFFER_TYPE, v8::internal::JS_ARRAY_TYPE, v8::internal::JS_BUILTINS_OBJECT_TYPE, v8::internal::JS_CONTEXT_EXTENSION_OBJECT_TYPE, v8::internal::JS_DATA_VIEW_TYPE, v8::internal::JS_DATE_TYPE, v8::internal::JS_FUNCTION_PROXY_TYPE, v8::internal::JS_FUNCTION_TYPE, v8::internal::JS_GENERATOR_OBJECT_TYPE, v8::internal::JS_GLOBAL_OBJECT_TYPE, v8::internal::JS_GLOBAL_PROXY_TYPE, v8::internal::JS_MAP_ITERATOR_TYPE, v8::internal::JS_MAP_TYPE, v8::internal::JS_MESSAGE_OBJECT_TYPE, v8::internal::JS_MODULE_TYPE, v8::internal::JS_OBJECT_TYPE, v8::internal::JS_PROXY_TYPE, v8::internal::JS_REGEXP_TYPE, v8::internal::JS_SET_ITERATOR_TYPE, v8::internal::JS_SET_TYPE, v8::internal::JS_TYPED_ARRAY_TYPE, v8::internal::JS_VALUE_TYPE, v8::internal::JS_WEAK_MAP_TYPE, v8::internal::JS_WEAK_SET_TYPE, v8::internal::kConsStringTag, v8::internal::kExternalStringTag, v8::internal::kOneByteStringTag, v8::internal::kSeqStringTag, v8::internal::JSProxy::kSize, v8::internal::JSFunctionProxy::kSize, v8::internal::JSCollection::kSize, v8::internal::Foreign::kSize, v8::internal::kSlicedStringTag, v8::internal::kStringEncodingMask, v8::internal::kStringRepresentationMask, kVisitDataObject, kVisitJSObject, kVisitorIdCount, kVisitStruct, MAKE_STRUCT_CASE, v8::internal::MAP_TYPE, v8::internal::MUTABLE_HEAP_NUMBER_TYPE, v8::internal::ODDBALL_TYPE, v8::internal::PROPERTY_CELL_TYPE, v8::internal::SHARED_FUNCTION_INFO_TYPE, STRUCT_LIST, v8::internal::SYMBOL_TYPE, TYPED_ARRAYS, and UNREACHABLE.

Referenced by v8::internal::Heap::AllocateMap(), v8::internal::Heap::AllocatePartialMap(), v8::internal::Map::Create(), GetVisitorId(), and v8::internal::ShrinkInstanceSize().

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GetVisitorId() [2/2]

static VisitorId v8::internal::StaticVisitorBase::GetVisitorId ( Map *  map )

inlinestatic

Definition at line 109 of file objects-visiting.h.

                                          {
    return GetVisitorId(map->instance_type(), map->instance_size());
  }

References GetVisitorId(), and map.

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GetVisitorIdForSize()

static VisitorId v8::internal::StaticVisitorBase::GetVisitorIdForSize ( VisitorId  base, VisitorId  generic, int  object_size  )

inlinestatic

Definition at line 115 of file objects-visiting.h.

                                                        {
    DCHECK((base == kVisitDataObject) || (base == kVisitStruct) ||
           (base == kVisitJSObject));
    DCHECK(IsAligned(object_size, kPointerSize));
    DCHECK(kMinObjectSizeInWords * kPointerSize <= object_size);
    DCHECK(object_size <= Page::kMaxRegularHeapObjectSize);
 
    const VisitorId specialization = static_cast<VisitorId>(
        base + (object_size >> kPointerSizeLog2) - kMinObjectSizeInWords);
 
    return Min(specialization, generic);
  }

References DCHECK, v8::internal::IsAligned(), v8::internal::Page::kMaxRegularHeapObjectSize, kMinObjectSizeInWords, v8::internal::kPointerSize, v8::internal::kPointerSizeLog2, kVisitDataObject, kVisitJSObject, kVisitStruct, and v8::internal::Min().

Referenced by GetVisitorId(), and v8::internal::VisitorDispatchTable< Callback >::RegisterSpecialization().

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STATIC_ASSERT()

v8::internal::StaticVisitorBase::STATIC_ASSERT

(

kVisitorIdCount<=

256

)

---

The documentation for this class was generated from the following files:

• /mnt/V8SourceCode/src/heap/objects-visiting.h
• /mnt/V8SourceCode/src/heap/objects-visiting.cc