objects.h.svn-base

Google浏览器V8内核代码

    short_sliced_ascii_string)                                                 \
  V(MEDIUM_SLICED_ASCII_STRING_TYPE,                                           \
    SlicedString::kSize,                                                       \
    medium_sliced_ascii_string)                                                \
  V(LONG_SLICED_ASCII_STRING_TYPE,                                             \
    SlicedString::kSize,                                                       \
    long_sliced_ascii_string)                                                  \
  V(SHORT_EXTERNAL_STRING_TYPE,                                                \
    ExternalTwoByteString::kSize,                                              \
    short_external_string)                                                     \
  V(MEDIUM_EXTERNAL_STRING_TYPE,                                               \
    ExternalTwoByteString::kSize,                                              \
    medium_external_string)                                                    \
  V(LONG_EXTERNAL_STRING_TYPE,                                                 \
    ExternalTwoByteString::kSize,                                              \
    long_external_string)                                                      \
  V(SHORT_EXTERNAL_ASCII_STRING_TYPE,                                          \
    ExternalAsciiString::kSize,                                                \
    short_external_ascii_string)                                               \
  V(MEDIUM_EXTERNAL_ASCII_STRING_TYPE,                                         \
    ExternalAsciiString::kSize,                                                \
    medium_external_ascii_string)                                              \
  V(LONG_EXTERNAL_ASCII_STRING_TYPE,                                           \
    ExternalAsciiString::kSize,                                                \
    long_external_ascii_string)

// A struct is a simple object a set of object-valued fields.  Including an
// object type in this causes the compiler to generate most of the boilerplate
// code for the class including allocation and garbage collection routines,
// casts and predicates.  All you need to define is the class, methods and
// object verification routines.  Easy, no?
//
// Note that for subtle reasons related to the ordering or numerical values of
// type tags, elements in this list have to be added to the INSTANCE_TYPE_LIST
// manually.
#define STRUCT_LIST(V)                                                    \
  V(ACCESSOR_INFO, AccessorInfo, accessor_info)                           \
  V(ACCESS_CHECK_INFO, AccessCheckInfo, access_check_info)                \
  V(INTERCEPTOR_INFO, InterceptorInfo, interceptor_info)                  \
  V(CALL_HANDLER_INFO, CallHandlerInfo, call_handler_info)                \
  V(FUNCTION_TEMPLATE_INFO, FunctionTemplateInfo, function_template_info) \
  V(OBJECT_TEMPLATE_INFO, ObjectTemplateInfo, object_template_info)       \
  V(SIGNATURE_INFO, SignatureInfo, signature_info)                        \
  V(TYPE_SWITCH_INFO, TypeSwitchInfo, type_switch_info)                   \
  V(DEBUG_INFO, DebugInfo, debug_info)                                    \
  V(BREAK_POINT_INFO, BreakPointInfo, break_point_info)                   \
  V(SCRIPT, Script, script)


// We use the full 8 bits of the instance_type field to encode heap object
// instance types.  The high-order bit (bit 7) is set if the object is not a
// string, and cleared if it is a string.
const uint32_t kIsNotStringMask = 0x80;
const uint32_t kStringTag = 0x0;
const uint32_t kNotStringTag = 0x80;

// If bit 7 is clear, bits 5 and 6 are the string's size (short, medium, or
// long).
const uint32_t kStringSizeMask = 0x60;
const uint32_t kShortStringTag = 0x0;
const uint32_t kMediumStringTag = 0x20;
const uint32_t kLongStringTag = 0x40;

// If bit 7 is clear, bit 4 indicates that the string is a symbol (if set) or
// not (if cleared).
const uint32_t kIsSymbolMask = 0x10;
const uint32_t kNotSymbolTag = 0x0;
const uint32_t kSymbolTag = 0x10;

// If bit 7 is clear, and the string representation is a sequential string,
// then bit 3 indicates whether the string consists of two-byte characters or
// one-byte characters.
const uint32_t kStringEncodingMask = 0x8;
const uint32_t kTwoByteStringTag = 0x0;
const uint32_t kAsciiStringTag = 0x8;

// If bit 7 is clear, the low-order 3 bits indicate the representation
// of the string.
const uint32_t kStringRepresentationMask = 0x07;
enum StringRepresentationTag {
  kSeqStringTag = 0x0,
  kConsStringTag = 0x1,
  kSlicedStringTag = 0x2,
  kExternalStringTag = 0x3
};

enum InstanceType {
  SHORT_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kSeqStringTag,
  MEDIUM_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kSeqStringTag,
  LONG_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kSeqStringTag,
  SHORT_ASCII_SYMBOL_TYPE =
      kShortStringTag | kAsciiStringTag | kSymbolTag | kSeqStringTag,
  MEDIUM_ASCII_SYMBOL_TYPE =
      kMediumStringTag | kAsciiStringTag | kSymbolTag | kSeqStringTag,
  LONG_ASCII_SYMBOL_TYPE =
      kLongStringTag | kAsciiStringTag | kSymbolTag | kSeqStringTag,
  SHORT_CONS_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kConsStringTag,
  MEDIUM_CONS_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kConsStringTag,
  LONG_CONS_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kConsStringTag,
  SHORT_CONS_ASCII_SYMBOL_TYPE =
      kShortStringTag | kAsciiStringTag | kSymbolTag | kConsStringTag,
  MEDIUM_CONS_ASCII_SYMBOL_TYPE =
      kMediumStringTag | kAsciiStringTag | kSymbolTag | kConsStringTag,
  LONG_CONS_ASCII_SYMBOL_TYPE =
      kLongStringTag | kAsciiStringTag | kSymbolTag | kConsStringTag,
  SHORT_SLICED_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kSlicedStringTag,
  MEDIUM_SLICED_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kSlicedStringTag,
  LONG_SLICED_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kSlicedStringTag,
  SHORT_SLICED_ASCII_SYMBOL_TYPE =
      kShortStringTag | kAsciiStringTag | kSymbolTag | kSlicedStringTag,
  MEDIUM_SLICED_ASCII_SYMBOL_TYPE =
      kMediumStringTag | kAsciiStringTag | kSymbolTag | kSlicedStringTag,
  LONG_SLICED_ASCII_SYMBOL_TYPE =
      kLongStringTag | kAsciiStringTag | kSymbolTag | kSlicedStringTag,
  SHORT_EXTERNAL_SYMBOL_TYPE =
      kShortStringTag | kSymbolTag | kExternalStringTag,
  MEDIUM_EXTERNAL_SYMBOL_TYPE =
      kMediumStringTag | kSymbolTag | kExternalStringTag,
  LONG_EXTERNAL_SYMBOL_TYPE = kLongStringTag | kSymbolTag | kExternalStringTag,
  SHORT_EXTERNAL_ASCII_SYMBOL_TYPE =
      kShortStringTag | kAsciiStringTag | kSymbolTag | kExternalStringTag,
  MEDIUM_EXTERNAL_ASCII_SYMBOL_TYPE =
      kMediumStringTag | kAsciiStringTag | kSymbolTag | kExternalStringTag,
  LONG_EXTERNAL_ASCII_SYMBOL_TYPE =
      kLongStringTag | kAsciiStringTag | kSymbolTag | kExternalStringTag,
  SHORT_STRING_TYPE = kShortStringTag | kSeqStringTag,
  MEDIUM_STRING_TYPE = kMediumStringTag | kSeqStringTag,
  LONG_STRING_TYPE = kLongStringTag | kSeqStringTag,
  SHORT_ASCII_STRING_TYPE = kShortStringTag | kAsciiStringTag | kSeqStringTag,
  MEDIUM_ASCII_STRING_TYPE = kMediumStringTag | kAsciiStringTag | kSeqStringTag,
  LONG_ASCII_STRING_TYPE = kLongStringTag | kAsciiStringTag | kSeqStringTag,
  SHORT_CONS_STRING_TYPE = kShortStringTag | kConsStringTag,
  MEDIUM_CONS_STRING_TYPE = kMediumStringTag | kConsStringTag,
  LONG_CONS_STRING_TYPE = kLongStringTag | kConsStringTag,
  SHORT_CONS_ASCII_STRING_TYPE =
      kShortStringTag | kAsciiStringTag | kConsStringTag,
  MEDIUM_CONS_ASCII_STRING_TYPE =
      kMediumStringTag | kAsciiStringTag | kConsStringTag,
  LONG_CONS_ASCII_STRING_TYPE =
      kLongStringTag | kAsciiStringTag | kConsStringTag,
  SHORT_SLICED_STRING_TYPE = kShortStringTag | kSlicedStringTag,
  MEDIUM_SLICED_STRING_TYPE = kMediumStringTag | kSlicedStringTag,
  LONG_SLICED_STRING_TYPE = kLongStringTag | kSlicedStringTag,
  SHORT_SLICED_ASCII_STRING_TYPE =
      kShortStringTag | kAsciiStringTag | kSlicedStringTag,
  MEDIUM_SLICED_ASCII_STRING_TYPE =
      kMediumStringTag | kAsciiStringTag | kSlicedStringTag,
  LONG_SLICED_ASCII_STRING_TYPE =
      kLongStringTag | kAsciiStringTag | kSlicedStringTag,
  SHORT_EXTERNAL_STRING_TYPE = kShortStringTag | kExternalStringTag,
  MEDIUM_EXTERNAL_STRING_TYPE = kMediumStringTag | kExternalStringTag,
  LONG_EXTERNAL_STRING_TYPE = kLongStringTag | kExternalStringTag,
  SHORT_EXTERNAL_ASCII_STRING_TYPE =
      kShortStringTag | kAsciiStringTag | kExternalStringTag,
  MEDIUM_EXTERNAL_ASCII_STRING_TYPE =
      kMediumStringTag | kAsciiStringTag | kExternalStringTag,
  LONG_EXTERNAL_ASCII_STRING_TYPE =
      kLongStringTag | kAsciiStringTag | kExternalStringTag,
  LONG_PRIVATE_EXTERNAL_ASCII_STRING_TYPE = LONG_EXTERNAL_ASCII_STRING_TYPE,

  MAP_TYPE = kNotStringTag,
  HEAP_NUMBER_TYPE,
  FIXED_ARRAY_TYPE,
  CODE_TYPE,
  ODDBALL_TYPE,
  PROXY_TYPE,
  BYTE_ARRAY_TYPE,
  FILLER_TYPE,
  SMI_TYPE,

  ACCESSOR_INFO_TYPE,
  ACCESS_CHECK_INFO_TYPE,
  INTERCEPTOR_INFO_TYPE,
  SHARED_FUNCTION_INFO_TYPE,
  CALL_HANDLER_INFO_TYPE,
  FUNCTION_TEMPLATE_INFO_TYPE,
  OBJECT_TEMPLATE_INFO_TYPE,
  SIGNATURE_INFO_TYPE,
  TYPE_SWITCH_INFO_TYPE,
  DEBUG_INFO_TYPE,
  BREAK_POINT_INFO_TYPE,
  SCRIPT_TYPE,

  JS_VALUE_TYPE,
  JS_OBJECT_TYPE,
  JS_GLOBAL_OBJECT_TYPE,
  JS_BUILTINS_OBJECT_TYPE,
  JS_ARRAY_TYPE,
  JS_REGEXP_TYPE,

  JS_FUNCTION_TYPE,

  // Pseudo-types
  FIRST_NONSTRING_TYPE = MAP_TYPE,
  FIRST_TYPE = 0x0,
  LAST_TYPE = JS_FUNCTION_TYPE,
  // Boundaries for testing the type is a JavaScript "object".  Note that
  // function objects are not counted as objects, even though they are
  // implemented as such; only values whose typeof is "object" are included.
  FIRST_JS_OBJECT_TYPE = JS_VALUE_TYPE,
  LAST_JS_OBJECT_TYPE = JS_REGEXP_TYPE
};


enum CompareResult {
  LESS      = -1,
  EQUAL     =  0,
  GREATER   =  1,

  NOT_EQUAL = GREATER
};


#define DECL_BOOLEAN_ACCESSORS(name)   \
  inline bool name();                  \
  inline void set_##name(bool value);  \


#define DECL_ACCESSORS(name, type)  \
  inline type* name();                 \
  inline void set_##name(type* value);


class StringStream;
class ObjectVisitor;

struct ValueInfo : public Malloced {
  ValueInfo() : type(FIRST_TYPE), ptr(NULL), str(NULL), number(0) { }
  InstanceType type;
  Object* ptr;
  const char* str;
  double number;
};


// A template-ized version of the IsXXX functions.
template <class C> static inline bool Is(Object* obj);


// Object is the abstract superclass for all classes in the
// object hierarchy.
// Object does not use any virtual functions to avoid the
// allocation of the C++ vtable.
// Since Smi and Failure are subclasses of Object no
// data members can be present in Object.
class Object BASE_EMBEDDED {
 public:
  // Type testing.
  inline bool IsSmi();
  inline bool IsHeapObject();
  inline bool IsHeapNumber();
  inline bool IsString();
  inline bool IsSeqString();
  inline bool IsAsciiString();
  inline bool IsTwoByteString();
  inline bool IsConsString();
  inline bool IsSlicedString();
  inline bool IsExternalString();
  inline bool IsExternalAsciiString();
  inline bool IsExternalTwoByteString();
  inline bool IsShortString();
  inline bool IsMediumString();
  inline bool IsLongString();
  inline bool IsSymbol();
  inline bool IsNumber();
  inline bool IsByteArray();
  inline bool IsFailure();
  inline bool IsRetryAfterGC();
  inline bool IsException();
  inline bool IsJSObject();
  inline bool IsMap();
  inline bool IsFixedArray();
  inline bool IsDescriptorArray();
  inline bool IsContext();
  inline bool IsGlobalContext();
  inline bool IsJSFunction();
  inline bool IsCode();
  inline bool IsOddball();
  inline bool IsSharedFunctionInfo();
  inline bool IsJSValue();
  inline bool IsProxy();
  inline bool IsBoolean();
  inline bool IsJSArray();
  inline bool IsJSRegExp();
  inline bool IsHashTable();
  inline bool IsDictionary();
  inline bool IsSymbolTable();
  inline bool IsCompilationCacheTable();
  inline bool IsMapCache();
  inline bool IsPrimitive();
  inline bool IsGlobalObject();
  inline bool IsJSGlobalObject();
  inline bool IsJSBuiltinsObject();
  inline bool IsUndetectableObject();
  inline bool IsAccessCheckNeeded();

  // Returns true if this object is an instance of the specified
  // function template.
  bool IsInstanceOf(FunctionTemplateInfo* type);

  inline bool IsStruct();
#define DECLARE_STRUCT_PREDICATE(NAME, Name, name) inline bool Is##Name();
  STRUCT_LIST(DECLARE_STRUCT_PREDICATE)
#undef DECLARE_STRUCT_PREDICATE

  // Oddball testing.
  INLINE(bool IsUndefined());
  INLINE(bool IsTheHole());
  INLINE(bool IsNull());
  INLINE(bool IsTrue());
  INLINE(bool IsFalse());

  // Extract the number.
  inline double Number();

  Object* ToObject();             // ECMA-262 9.9.
  Object* ToBoolean();            // ECMA-262 9.2.

  // Convert to a JSObject if needed.
  // global_context is used when creating wrapper object.
  Object* ToObject(Context* global_context);

  // Converts this to a Smi if possible.
  // Failure is returned otherwise.
  inline Object* ToSmi();

  void Lookup(String* name, LookupResult* result);

  // Property access.
  inline Object* GetProperty(String* key);
  inline Object* GetProperty(String* key, PropertyAttributes* attributes);
  Object* GetPropertyWithReceiver(Object* receiver,
                                  String* key,