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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 // 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 #ifndef V8_SCOPEINFO_H_ | 5 #ifndef V8_SCOPEINFO_H_ |
6 #define V8_SCOPEINFO_H_ | 6 #define V8_SCOPEINFO_H_ |
7 | 7 |
8 #include "allocation.h" | 8 #include "allocation.h" |
9 #include "variables.h" | 9 #include "variables.h" |
10 #include "zone-inl.h" | 10 #include "zone-inl.h" |
11 | 11 |
12 namespace v8 { | 12 namespace v8 { |
13 namespace internal { | 13 namespace internal { |
14 | 14 |
15 // Cache for mapping (data, property name) into context slot index. | 15 // Cache for mapping (data, property name) into context slot index. |
16 // The cache contains both positive and negative results. | 16 // The cache contains both positive and negative results. |
17 // Slot index equals -1 means the property is absent. | 17 // Slot index equals -1 means the property is absent. |
18 // Cleared at startup and prior to mark sweep collection. | 18 // Cleared at startup and prior to mark sweep collection. |
19 class ContextSlotCache { | 19 class ContextSlotCache { |
20 public: | 20 public: |
21 // Lookup context slot index for (data, name). | 21 // Lookup context slot index for (data, name). |
22 // If absent, kNotFound is returned. | 22 // If absent, kNotFound is returned. |
23 int Lookup(Object* data, | 23 int Lookup(Object* data, |
24 String* name, | 24 String* name, |
25 VariableMode* mode, | 25 VariableMode* mode, |
26 InitializationFlag* init_flag); | 26 InitializationFlag* init_flag); |
27 | 27 |
28 // Update an element in the cache. | 28 // Update an element in the cache. |
29 void Update(Object* data, | 29 void Update(Handle<Object> data, |
30 String* name, | 30 Handle<String> name, |
31 VariableMode mode, | 31 VariableMode mode, |
32 InitializationFlag init_flag, | 32 InitializationFlag init_flag, |
33 int slot_index); | 33 int slot_index); |
34 | 34 |
35 // Clear the cache. | 35 // Clear the cache. |
36 void Clear(); | 36 void Clear(); |
37 | 37 |
38 static const int kNotFound = -2; | 38 static const int kNotFound = -2; |
39 | 39 |
40 private: | 40 private: |
41 ContextSlotCache() { | 41 ContextSlotCache() { |
42 for (int i = 0; i < kLength; ++i) { | 42 for (int i = 0; i < kLength; ++i) { |
43 keys_[i].data = NULL; | 43 keys_[i].data = NULL; |
44 keys_[i].name = NULL; | 44 keys_[i].name = NULL; |
45 values_[i] = kNotFound; | 45 values_[i] = kNotFound; |
46 } | 46 } |
47 } | 47 } |
48 | 48 |
49 inline static int Hash(Object* data, String* name); | 49 inline static int Hash(Object* data, String* name); |
50 | 50 |
51 #ifdef DEBUG | 51 #ifdef DEBUG |
52 void ValidateEntry(Object* data, | 52 void ValidateEntry(Handle<Object> data, |
53 String* name, | 53 Handle<String> name, |
54 VariableMode mode, | 54 VariableMode mode, |
55 InitializationFlag init_flag, | 55 InitializationFlag init_flag, |
56 int slot_index); | 56 int slot_index); |
57 #endif | 57 #endif |
58 | 58 |
59 static const int kLength = 256; | 59 static const int kLength = 256; |
60 struct Key { | 60 struct Key { |
61 Object* data; | 61 Object* data; |
62 String* name; | 62 String* name; |
63 }; | 63 }; |
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164 } | 164 } |
165 void set_index(int i, int index) { | 165 void set_index(int i, int index) { |
166 set(index_offset(i), Smi::FromInt(index)); | 166 set(index_offset(i), Smi::FromInt(index)); |
167 } | 167 } |
168 }; | 168 }; |
169 | 169 |
170 | 170 |
171 } } // namespace v8::internal | 171 } } // namespace v8::internal |
172 | 172 |
173 #endif // V8_SCOPEINFO_H_ | 173 #endif // V8_SCOPEINFO_H_ |
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