Built-in JSON support

src/objects.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1224 matching lines @@
                                      String* name,
                                      PropertyAttributes* attributes);
   Object* GetPropertyPostInterceptor(JSObject* receiver,
                                      String* name,
                                      PropertyAttributes* attributes);
   Object* GetLazyProperty(Object* receiver,
                           LookupResult* result,
                           String* name,
                           PropertyAttributes* attributes);
 
+  // Tells whether this object needs to be loaded.
+  inline bool IsLoaded();
+
   bool HasProperty(String* name) {
     return GetPropertyAttribute(name) != ABSENT;
   }
 
   bool HasLocalProperty(String* name) {
     return GetLocalPropertyAttribute(name) != ABSENT;
   }
 
   Object* DeleteProperty(String* name);
   Object* DeleteElement(uint32_t index);
@@ skipping 1135 matching lines @@
 
   // Tells how many unused property fields are available in the
   // instance (only used for JSObject in fast mode).
   inline int unused_property_fields();
   inline void set_unused_property_fields(int value);
 
   // Bit field.
   inline byte bit_field();
   inline void set_bit_field(byte value);
 
+  // Bit field 2.
+  inline byte bit_field2();
+  inline void set_bit_field2(byte value);
+
   // Tells whether the object in the prototype property will be used
   // for instances created from this function.  If the prototype
   // property is set to a value that is not a JSObject, the prototype
   // property will not be used to create instances of the function.
   // See ECMA-262, 13.2.2.
   inline void set_non_instance_prototype(bool value);
   inline bool has_non_instance_prototype();
 
   // Tells whether the instance with this map should be ignored by the
   // __proto__ accessor.
@@ skipping 30 matching lines @@
   // document.all in Firefox & Safari.
   // See https://bugzilla.mozilla.org/show_bug.cgi?id=248549.
   inline void set_is_undetectable() {
     set_bit_field(bit_field() | (1 << kIsUndetectable));
   }
 
   inline bool is_undetectable() {
     return ((1 << kIsUndetectable) & bit_field()) != 0;
   }
 
+  inline void set_needs_loading(bool value) {
+    if (value) {
+      set_bit_field2(bit_field2() | (1 << kNeedsLoading));
+    } else {
+      set_bit_field2(bit_field2() & ~(1 << kNeedsLoading));
+    }
+  }
+
+  // Does this object or function require a lazily loaded script to be
+  // run before being used?
+  inline bool needs_loading() {
+    return ((1 << kNeedsLoading) & bit_field2()) != 0;
+  }
+
   // Tells whether the instance has a call-as-function handler.
   inline void set_has_instance_call_handler() {
     set_bit_field(bit_field() | (1 << kHasInstanceCallHandler));
   }
 
   inline bool has_instance_call_handler() {
     return ((1 << kHasInstanceCallHandler) & bit_field()) != 0;
   }
 
   // Tells whether the instance needs security checks when accessing its
@@ skipping 83 matching lines @@
 
   // Byte offsets within kInstanceSizesOffset.
   static const int kInstanceSizeOffset = kInstanceSizesOffset + 0;
   static const int kInObjectPropertiesOffset = kInstanceSizesOffset + 1;
   // The bytes at positions 2 and 3 are not in use at the moment.
 
   // Byte offsets within kInstanceAttributesOffset attributes.
   static const int kInstanceTypeOffset = kInstanceAttributesOffset + 0;
   static const int kUnusedPropertyFieldsOffset = kInstanceAttributesOffset + 1;
   static const int kBitFieldOffset = kInstanceAttributesOffset + 2;
-  // The  byte at position 3 is not in use at the moment.
+  static const int kBitField2Offset = kInstanceAttributesOffset + 3;
 
   // Bit positions for bit field.
   static const int kUnused = 0;  // To be used for marking recently used maps.
   static const int kHasNonInstancePrototype = 1;
   static const int kIsHiddenPrototype = 2;
   static const int kHasNamedInterceptor = 3;
   static const int kHasIndexedInterceptor = 4;
   static const int kIsUndetectable = 5;
   static const int kHasInstanceCallHandler = 6;
   static const int kIsAccessCheckNeeded = 7;
+
+  // But positions for but field 2

[Mads Ager (chromium), 2009/04/23 19:09:25]

Bit positions for bit field 2?

[Christian Plesner Hansen, 2009/04/24 08:11:22]

Whoops.

+  static const int kNeedsLoading = 0;
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Map);
 };
 
 
 // An abstract superclass, a marker class really, for simple structure classes.
 // It doesn't carry much functionality but allows struct classes to me
 // identified in the type system.
 class Struct: public HeapObject {
  public:
@@ skipping 96 matching lines @@
 
   // [instance class name]: class name for instances.
   DECL_ACCESSORS(instance_class_name, Object)
 
   // [function data]: This field has been added for make benefit the API.
   // In the long run we don't want all functions to have this field but
   // we can fix that when we have a better model for storing hidden data
   // on objects.
   DECL_ACCESSORS(function_data, Object)
 
-  // [lazy load data]: If the function has lazy loading, this field
-  // contains contexts and other data needed to load it.
-  DECL_ACCESSORS(lazy_load_data, Object)
-
   // [script info]: Script from which the function originates.
   DECL_ACCESSORS(script, Object)
 
   // [start_position_and_type]: Field used to store both the source code
   // position, whether or not the function is a function expression,
   // and whether or not the function is a toplevel function. The two
   // least significants bit indicates whether the function is an
   // expression and the rest contains the source code position.
   inline int start_position_and_type();
   inline void set_start_position_and_type(int value);
@@ skipping 53 matching lines @@
   static const int kNameOffset = HeapObject::kHeaderSize;
   static const int kCodeOffset = kNameOffset + kPointerSize;
   static const int kLengthOffset = kCodeOffset + kPointerSize;
   static const int kFormalParameterCountOffset = kLengthOffset + kIntSize;
   static const int kExpectedNofPropertiesOffset =
       kFormalParameterCountOffset + kIntSize;
   static const int kInstanceClassNameOffset =
       kExpectedNofPropertiesOffset + kIntSize;
   static const int kExternalReferenceDataOffset =
       kInstanceClassNameOffset + kPointerSize;
-  static const int kLazyLoadDataOffset =
-      kExternalReferenceDataOffset + kPointerSize;
-  static const int kScriptOffset = kLazyLoadDataOffset + kPointerSize;
+  static const int kScriptOffset = kExternalReferenceDataOffset + kPointerSize;
   static const int kStartPositionAndTypeOffset = kScriptOffset + kPointerSize;
   static const int kEndPositionOffset = kStartPositionAndTypeOffset + kIntSize;
   static const int kFunctionTokenPositionOffset = kEndPositionOffset + kIntSize;
   static const int kDebugInfoOffset = kFunctionTokenPositionOffset + kIntSize;
   static const int kInferredNameOffset = kDebugInfoOffset + kPointerSize;
   static const int kSize = kInferredNameOffset + kPointerSize;
 
  private:
   // Bit positions in length_and_flg.
   // The least significant bit is used as the flag.
@@ skipping 32 matching lines @@
   // when the function is invoked, e.g. foo() or new foo(). See
   // [[Call]] and [[Construct]] description in ECMA-262, section
   // 8.6.2, page 27.
   inline Code* code();
   inline void set_code(Code* value);
 
   // Tells whether this function is a context-independent boilerplate
   // function.
   inline bool IsBoilerplate();
 
-  // Tells whether this function needs to be loaded.
-  inline bool IsLoaded();
-
   // [literals]: Fixed array holding the materialized literals.
   //
   // If the function contains object, regexp or array literals, the
   // literals array prefix contains the object, regexp, and array
   // function to be used when creating these literals.  This is
   // necessary so that we do not dynamically lookup the object, regexp
   // or array functions.  Performing a dynamic lookup, we might end up
   // using the functions from a new context that we should not have
   // access to.
   DECL_ACCESSORS(literals, FixedArray)
@@ skipping 1522 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_