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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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| 1971 MUST_USE_RESULT MaybeObject* ArrayConstructInitializeElements( | 1971 MUST_USE_RESULT MaybeObject* ArrayConstructInitializeElements( |
| 1972 JSArray* array, Arguments* args) { | 1972 JSArray* array, Arguments* args) { |
| 1973 Heap* heap = array->GetIsolate()->heap(); | 1973 Heap* heap = array->GetIsolate()->heap(); |
| 1974 | 1974 |
| 1975 // Optimize the case where there is one argument and the argument is a | 1975 // Optimize the case where there is one argument and the argument is a |
| 1976 // small smi. | 1976 // small smi. |
| 1977 if (args->length() == 1) { | 1977 if (args->length() == 1) { |
| 1978 Object* obj = (*args)[0]; | 1978 Object* obj = (*args)[0]; |
| 1979 if (obj->IsSmi()) { | 1979 if (obj->IsSmi()) { |
| 1980 int len = Smi::cast(obj)->value(); | 1980 int len = Smi::cast(obj)->value(); |
| 1981 if (len > 0 && len < JSObject::kInitialMaxFastElementArray) { | 1981 if (len > 0 && len <= JSObject::kInitialMaxFastElementArray) { |
| 1982 ElementsKind elements_kind = array->GetElementsKind(); | 1982 ElementsKind elements_kind = array->GetElementsKind(); |
| 1983 MaybeObject* maybe_array = array->Initialize(len, len); | 1983 MaybeObject* maybe_array = array->Initialize(len, len); |
| 1984 if (maybe_array->IsFailure()) return maybe_array; | 1984 if (maybe_array->IsFailure()) return maybe_array; |
| 1985 | 1985 |
| 1986 if (!IsFastHoleyElementsKind(elements_kind)) { | 1986 if (!IsFastHoleyElementsKind(elements_kind)) { |
| 1987 elements_kind = GetHoleyElementsKind(elements_kind); | 1987 elements_kind = GetHoleyElementsKind(elements_kind); |
| 1988 maybe_array = array->TransitionElementsKind(elements_kind); | 1988 maybe_array = array->TransitionElementsKind(elements_kind); |
| 1989 if (maybe_array->IsFailure()) return maybe_array; | 1989 if (maybe_array->IsFailure()) return maybe_array; |
| 1990 } | 1990 } |
| 1991 | 1991 |
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| 2058 UNREACHABLE(); | 2058 UNREACHABLE(); |
| 2059 break; | 2059 break; |
| 2060 } | 2060 } |
| 2061 | 2061 |
| 2062 array->set_elements(elms); | 2062 array->set_elements(elms); |
| 2063 array->set_length(Smi::FromInt(number_of_elements)); | 2063 array->set_length(Smi::FromInt(number_of_elements)); |
| 2064 return array; | 2064 return array; |
| 2065 } | 2065 } |
| 2066 | 2066 |
| 2067 } } // namespace v8::internal | 2067 } } // namespace v8::internal |
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