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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/type-feedback-vector.h" | 5 #include "src/type-feedback-vector.h" |
6 | 6 |
7 #include "src/code-stubs.h" | 7 #include "src/code-stubs.h" |
8 #include "src/ic/ic.h" | 8 #include "src/ic/ic.h" |
9 #include "src/ic/ic-state.h" | 9 #include "src/ic/ic-state.h" |
10 #include "src/objects.h" | 10 #include "src/objects.h" |
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93 for (int i = 0; i < slot_kinds_length; i++) { | 93 for (int i = 0; i < slot_kinds_length; i++) { |
94 array->set(kReservedIndexCount + i, Smi::FromInt(0)); | 94 array->set(kReservedIndexCount + i, Smi::FromInt(0)); |
95 } | 95 } |
96 | 96 |
97 Handle<TypeFeedbackMetadata> metadata = | 97 Handle<TypeFeedbackMetadata> metadata = |
98 Handle<TypeFeedbackMetadata>::cast(array); | 98 Handle<TypeFeedbackMetadata>::cast(array); |
99 | 99 |
100 // Add names to NamesTable. | 100 // Add names to NamesTable. |
101 const int name_count = spec->name_count(); | 101 const int name_count = spec->name_count(); |
102 | 102 |
103 Handle<UnseededNumberDictionary> names = | 103 Handle<UnseededNumberDictionary> names; |
104 UnseededNumberDictionary::New(isolate, name_count); | 104 if (name_count) { |
| 105 names = UnseededNumberDictionary::New( |
| 106 isolate, base::bits::RoundUpToPowerOfTwo32(name_count), TENURED, |
| 107 USE_CUSTOM_MINIMUM_CAPACITY); |
| 108 } |
105 | 109 |
106 int name_index = 0; | 110 int name_index = 0; |
107 for (int i = 0; i < slot_count; i++) { | 111 for (int i = 0; i < slot_count; i++) { |
108 FeedbackVectorSlotKind kind = spec->GetKind(i); | 112 FeedbackVectorSlotKind kind = spec->GetKind(i); |
109 metadata->SetKind(FeedbackVectorSlot(i), kind); | 113 metadata->SetKind(FeedbackVectorSlot(i), kind); |
110 if (SlotRequiresName(kind)) { | 114 if (SlotRequiresName(kind)) { |
111 Handle<String> name = spec->GetName(name_index); | 115 Handle<String> name = spec->GetName(name_index); |
112 DCHECK(!name.is_null()); | 116 DCHECK(!name.is_null()); |
113 names = UnseededNumberDictionary::AtNumberPut(names, i, name); | 117 names = UnseededNumberDictionary::AtNumberPut(names, i, name); |
114 name_index++; | 118 name_index++; |
115 } | 119 } |
116 } | 120 } |
117 DCHECK_EQ(name_count, name_index); | 121 DCHECK_EQ(name_count, name_index); |
118 metadata->set(kNamesTableIndex, *names); | 122 metadata->set(kNamesTableIndex, |
| 123 name_count ? static_cast<Object*>(*names) : Smi::FromInt(0)); |
119 | 124 |
120 // It's important that the TypeFeedbackMetadata have a COW map, since it's | 125 // It's important that the TypeFeedbackMetadata have a COW map, since it's |
121 // pointed to by both a SharedFunctionInfo and indirectly by closures through | 126 // pointed to by both a SharedFunctionInfo and indirectly by closures through |
122 // the TypeFeedbackVector. The serializer uses the COW map type to decide | 127 // the TypeFeedbackVector. The serializer uses the COW map type to decide |
123 // this object belongs in the startup snapshot and not the partial | 128 // this object belongs in the startup snapshot and not the partial |
124 // snapshot(s). | 129 // snapshot(s). |
125 metadata->set_map(isolate->heap()->fixed_cow_array_map()); | 130 metadata->set_map(isolate->heap()->fixed_cow_array_map()); |
126 | 131 |
127 return metadata; | 132 return metadata; |
128 } | 133 } |
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1010 | 1015 |
1011 IcCheckType KeyedStoreICNexus::GetKeyType() const { | 1016 IcCheckType KeyedStoreICNexus::GetKeyType() const { |
1012 Object* feedback = GetFeedback(); | 1017 Object* feedback = GetFeedback(); |
1013 if (feedback == *TypeFeedbackVector::MegamorphicSentinel(GetIsolate())) { | 1018 if (feedback == *TypeFeedbackVector::MegamorphicSentinel(GetIsolate())) { |
1014 return static_cast<IcCheckType>(Smi::cast(GetFeedbackExtra())->value()); | 1019 return static_cast<IcCheckType>(Smi::cast(GetFeedbackExtra())->value()); |
1015 } | 1020 } |
1016 return IsPropertyNameFeedback(feedback) ? PROPERTY : ELEMENT; | 1021 return IsPropertyNameFeedback(feedback) ? PROPERTY : ELEMENT; |
1017 } | 1022 } |
1018 } // namespace internal | 1023 } // namespace internal |
1019 } // namespace v8 | 1024 } // namespace v8 |
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