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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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| 155 EXTERNAL_DOUBLE_ELEMENTS, | 155 EXTERNAL_DOUBLE_ELEMENTS, |
| 156 EXTERNAL_PIXEL_ELEMENTS, | 156 EXTERNAL_PIXEL_ELEMENTS, |
| 157 | 157 |
| 158 // Derived constants from ElementsKind | 158 // Derived constants from ElementsKind |
| 159 FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_BYTE_ELEMENTS, | 159 FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_BYTE_ELEMENTS, |
| 160 LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS, | 160 LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS, |
| 161 FIRST_ELEMENTS_KIND = FAST_SMI_ONLY_ELEMENTS, | 161 FIRST_ELEMENTS_KIND = FAST_SMI_ONLY_ELEMENTS, |
| 162 LAST_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS | 162 LAST_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS |
| 163 }; | 163 }; |
| 164 | 164 |
| 165 static const int kElementsKindCount = | 165 const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1; |
| 166 LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1; | |
| 167 | 166 |
| 168 void PrintElementsKind(FILE* out, ElementsKind kind); | 167 void PrintElementsKind(FILE* out, ElementsKind kind); |
| 169 | 168 |
| 170 inline bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind, | 169 inline bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind, |
| 171 ElementsKind to_kind); | 170 ElementsKind to_kind); |
| 172 | 171 |
| 173 // Setter that skips the write barrier if mode is SKIP_WRITE_BARRIER. | 172 // Setter that skips the write barrier if mode is SKIP_WRITE_BARRIER. |
| 174 enum WriteBarrierMode { SKIP_WRITE_BARRIER, UPDATE_WRITE_BARRIER }; | 173 enum WriteBarrierMode { SKIP_WRITE_BARRIER, UPDATE_WRITE_BARRIER }; |
| 175 | 174 |
| 176 | 175 |
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| 191 | 190 |
| 192 | 191 |
| 193 // Indicates whether a get method should implicitly create the object looked up. | 192 // Indicates whether a get method should implicitly create the object looked up. |
| 194 enum CreationFlag { | 193 enum CreationFlag { |
| 195 ALLOW_CREATION, | 194 ALLOW_CREATION, |
| 196 OMIT_CREATION | 195 OMIT_CREATION |
| 197 }; | 196 }; |
| 198 | 197 |
| 199 | 198 |
| 200 // Instance size sentinel for objects of variable size. | 199 // Instance size sentinel for objects of variable size. |
| 201 static const int kVariableSizeSentinel = 0; | 200 const int kVariableSizeSentinel = 0; |
| 202 | 201 |
| 203 | 202 |
| 204 // All Maps have a field instance_type containing a InstanceType. | 203 // All Maps have a field instance_type containing a InstanceType. |
| 205 // It describes the type of the instances. | 204 // It describes the type of the instances. |
| 206 // | 205 // |
| 207 // As an example, a JavaScript object is a heap object and its map | 206 // As an example, a JavaScript object is a heap object and its map |
| 208 // instance_type is JS_OBJECT_TYPE. | 207 // instance_type is JS_OBJECT_TYPE. |
| 209 // | 208 // |
| 210 // The names of the string instance types are intended to systematically | 209 // The names of the string instance types are intended to systematically |
| 211 // mirror their encoding in the instance_type field of the map. The default | 210 // mirror their encoding in the instance_type field of the map. The default |
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| 594 FIRST_SPEC_OBJECT_TYPE = FIRST_JS_RECEIVER_TYPE, | 593 FIRST_SPEC_OBJECT_TYPE = FIRST_JS_RECEIVER_TYPE, |
| 595 LAST_SPEC_OBJECT_TYPE = LAST_JS_RECEIVER_TYPE, | 594 LAST_SPEC_OBJECT_TYPE = LAST_JS_RECEIVER_TYPE, |
| 596 // Boundaries for testing the types for which typeof is "object". | 595 // Boundaries for testing the types for which typeof is "object". |
| 597 FIRST_NONCALLABLE_SPEC_OBJECT_TYPE = JS_PROXY_TYPE, | 596 FIRST_NONCALLABLE_SPEC_OBJECT_TYPE = JS_PROXY_TYPE, |
| 598 LAST_NONCALLABLE_SPEC_OBJECT_TYPE = JS_REGEXP_TYPE, | 597 LAST_NONCALLABLE_SPEC_OBJECT_TYPE = JS_REGEXP_TYPE, |
| 599 // Note that the types for which typeof is "function" are not continuous. | 598 // Note that the types for which typeof is "function" are not continuous. |
| 600 // Define this so that we can put assertions on discrete checks. | 599 // Define this so that we can put assertions on discrete checks. |
| 601 NUM_OF_CALLABLE_SPEC_OBJECT_TYPES = 2 | 600 NUM_OF_CALLABLE_SPEC_OBJECT_TYPES = 2 |
| 602 }; | 601 }; |
| 603 | 602 |
| 604 static const int kExternalArrayTypeCount = LAST_EXTERNAL_ARRAY_TYPE - | 603 const int kExternalArrayTypeCount = |
| 605 FIRST_EXTERNAL_ARRAY_TYPE + 1; | 604 LAST_EXTERNAL_ARRAY_TYPE - FIRST_EXTERNAL_ARRAY_TYPE + 1; |
| 606 | 605 |
| 607 STATIC_CHECK(JS_OBJECT_TYPE == Internals::kJSObjectType); | 606 STATIC_CHECK(JS_OBJECT_TYPE == Internals::kJSObjectType); |
| 608 STATIC_CHECK(FIRST_NONSTRING_TYPE == Internals::kFirstNonstringType); | 607 STATIC_CHECK(FIRST_NONSTRING_TYPE == Internals::kFirstNonstringType); |
| 609 STATIC_CHECK(FOREIGN_TYPE == Internals::kForeignType); | 608 STATIC_CHECK(FOREIGN_TYPE == Internals::kForeignType); |
| 610 | 609 |
| 611 | 610 |
| 612 enum CompareResult { | 611 enum CompareResult { |
| 613 LESS = -1, | 612 LESS = -1, |
| 614 EQUAL = 0, | 613 EQUAL = 0, |
| 615 GREATER = 1, | 614 GREATER = 1, |
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| 7884 } else { | 7883 } else { |
| 7885 value &= ~(1 << bit_position); | 7884 value &= ~(1 << bit_position); |
| 7886 } | 7885 } |
| 7887 return value; | 7886 return value; |
| 7888 } | 7887 } |
| 7889 }; | 7888 }; |
| 7890 | 7889 |
| 7891 } } // namespace v8::internal | 7890 } } // namespace v8::internal |
| 7892 | 7891 |
| 7893 #endif // V8_OBJECTS_H_ | 7892 #endif // V8_OBJECTS_H_ |
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