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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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1604 offset += kPointerSize; | 1604 offset += kPointerSize; |
1605 } | 1605 } |
1606 } | 1606 } |
1607 | 1607 |
1608 | 1608 |
1609 bool JSObject::HasFastProperties() { | 1609 bool JSObject::HasFastProperties() { |
1610 return !properties()->IsDictionary(); | 1610 return !properties()->IsDictionary(); |
1611 } | 1611 } |
1612 | 1612 |
1613 | 1613 |
1614 int JSObject::MaxFastProperties() { | 1614 bool JSObject::TooManyFastProperties(int properties) { |
1615 // Allow extra fast properties if the object has more than | 1615 // Allow extra fast properties if the object has more than |
1616 // kMaxFastProperties in-object properties. When this is the case, | 1616 // kFastPropertiesSoftLimit in-object properties. When this is the case, |
1617 // it is very unlikely that the object is being used as a dictionary | 1617 // it is very unlikely that the object is being used as a dictionary |
1618 // and there is a good chance that allowing more map transitions | 1618 // and there is a good chance that allowing more map transitions |
1619 // will be worth it. | 1619 // will be worth it. |
1620 return Max(map()->inobject_properties(), kMaxFastProperties); | 1620 int inobject = map()->inobject_properties(); |
| 1621 |
| 1622 int limit; |
| 1623 if (map()->used_for_prototype()) { |
| 1624 limit = Max(inobject, kMaxFastProperties); |
| 1625 } else { |
| 1626 limit = Max(inobject, kFastPropertiesSoftLimit); |
| 1627 } |
| 1628 return properties >= limit; |
1621 } | 1629 } |
1622 | 1630 |
1623 | 1631 |
1624 void Struct::InitializeBody(int object_size) { | 1632 void Struct::InitializeBody(int object_size) { |
1625 Object* value = GetHeap()->undefined_value(); | 1633 Object* value = GetHeap()->undefined_value(); |
1626 for (int offset = kHeaderSize; offset < object_size; offset += kPointerSize) { | 1634 for (int offset = kHeaderSize; offset < object_size; offset += kPointerSize) { |
1627 WRITE_FIELD(this, offset, value); | 1635 WRITE_FIELD(this, offset, value); |
1628 } | 1636 } |
1629 } | 1637 } |
1630 | 1638 |
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2917 } else { | 2925 } else { |
2918 set_bit_field3(bit_field3() & ~(1 << kIsShared)); | 2926 set_bit_field3(bit_field3() & ~(1 << kIsShared)); |
2919 } | 2927 } |
2920 } | 2928 } |
2921 | 2929 |
2922 bool Map::is_shared() { | 2930 bool Map::is_shared() { |
2923 return ((1 << kIsShared) & bit_field3()) != 0; | 2931 return ((1 << kIsShared) & bit_field3()) != 0; |
2924 } | 2932 } |
2925 | 2933 |
2926 | 2934 |
| 2935 void Map::set_used_for_prototype(bool value) { |
| 2936 if (value) { |
| 2937 set_bit_field3(bit_field3() | (1 << kUsedForPrototype)); |
| 2938 } else { |
| 2939 set_bit_field3(bit_field3() & ~(1 << kUsedForPrototype)); |
| 2940 } |
| 2941 } |
| 2942 |
| 2943 |
| 2944 bool Map::used_for_prototype() { |
| 2945 return ((1 << kUsedForPrototype) & bit_field3()) != 0; |
| 2946 } |
| 2947 |
| 2948 |
2927 JSFunction* Map::unchecked_constructor() { | 2949 JSFunction* Map::unchecked_constructor() { |
2928 return reinterpret_cast<JSFunction*>(READ_FIELD(this, kConstructorOffset)); | 2950 return reinterpret_cast<JSFunction*>(READ_FIELD(this, kConstructorOffset)); |
2929 } | 2951 } |
2930 | 2952 |
2931 | 2953 |
2932 Code::Flags Code::flags() { | 2954 Code::Flags Code::flags() { |
2933 return static_cast<Flags>(READ_INT_FIELD(this, kFlagsOffset)); | 2955 return static_cast<Flags>(READ_INT_FIELD(this, kFlagsOffset)); |
2934 } | 2956 } |
2935 | 2957 |
2936 | 2958 |
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4067 | 4089 |
4068 | 4090 |
4069 Object* JSFunction::prototype() { | 4091 Object* JSFunction::prototype() { |
4070 ASSERT(has_prototype()); | 4092 ASSERT(has_prototype()); |
4071 // If the function's prototype property has been set to a non-JSObject | 4093 // If the function's prototype property has been set to a non-JSObject |
4072 // value, that value is stored in the constructor field of the map. | 4094 // value, that value is stored in the constructor field of the map. |
4073 if (map()->has_non_instance_prototype()) return map()->constructor(); | 4095 if (map()->has_non_instance_prototype()) return map()->constructor(); |
4074 return instance_prototype(); | 4096 return instance_prototype(); |
4075 } | 4097 } |
4076 | 4098 |
| 4099 |
4077 bool JSFunction::should_have_prototype() { | 4100 bool JSFunction::should_have_prototype() { |
4078 return map()->function_with_prototype(); | 4101 return map()->function_with_prototype(); |
4079 } | 4102 } |
4080 | 4103 |
4081 | 4104 |
4082 bool JSFunction::is_compiled() { | 4105 bool JSFunction::is_compiled() { |
4083 return code() != GetIsolate()->builtins()->builtin(Builtins::kLazyCompile); | 4106 return code() != GetIsolate()->builtins()->builtin(Builtins::kLazyCompile); |
4084 } | 4107 } |
4085 | 4108 |
4086 | 4109 |
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5037 #undef WRITE_UINT32_FIELD | 5060 #undef WRITE_UINT32_FIELD |
5038 #undef READ_SHORT_FIELD | 5061 #undef READ_SHORT_FIELD |
5039 #undef WRITE_SHORT_FIELD | 5062 #undef WRITE_SHORT_FIELD |
5040 #undef READ_BYTE_FIELD | 5063 #undef READ_BYTE_FIELD |
5041 #undef WRITE_BYTE_FIELD | 5064 #undef WRITE_BYTE_FIELD |
5042 | 5065 |
5043 | 5066 |
5044 } } // namespace v8::internal | 5067 } } // namespace v8::internal |
5045 | 5068 |
5046 #endif // V8_OBJECTS_INL_H_ | 5069 #endif // V8_OBJECTS_INL_H_ |
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