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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_AST_SCOPEINFO_H_ | 5 #ifndef V8_AST_SCOPEINFO_H_ |
6 #define V8_AST_SCOPEINFO_H_ | 6 #define V8_AST_SCOPEINFO_H_ |
7 | 7 |
8 #include "src/allocation.h" | 8 #include "src/allocation.h" |
9 #include "src/ast/modules.h" | 9 #include "src/ast/modules.h" |
10 #include "src/ast/variables.h" | 10 #include "src/ast/variables.h" |
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101 }; | 101 }; |
102 | 102 |
103 Key keys_[kLength]; | 103 Key keys_[kLength]; |
104 uint32_t values_[kLength]; | 104 uint32_t values_[kLength]; |
105 | 105 |
106 friend class Isolate; | 106 friend class Isolate; |
107 DISALLOW_COPY_AND_ASSIGN(ContextSlotCache); | 107 DISALLOW_COPY_AND_ASSIGN(ContextSlotCache); |
108 }; | 108 }; |
109 | 109 |
110 | 110 |
111 | |
112 | |
113 //--------------------------------------------------------------------------- | |
114 // Auxiliary class used for the description of module instances. | |
115 // Used by Runtime_DeclareModules. | |
116 | |
117 class ModuleInfo: public FixedArray { | |
118 public: | |
119 static ModuleInfo* cast(Object* description) { | |
120 return static_cast<ModuleInfo*>(FixedArray::cast(description)); | |
121 } | |
122 | |
123 static Handle<ModuleInfo> Create(Isolate* isolate, | |
124 ModuleDescriptor* descriptor, Scope* scope); | |
125 | |
126 // Index of module's context in host context. | |
127 int host_index() { return Smi::cast(get(HOST_OFFSET))->value(); } | |
128 | |
129 // Name, mode, and index of the i-th export, respectively. | |
130 // For value exports, the index is the slot of the value in the module | |
131 // context, for exported modules it is the slot index of the | |
132 // referred module's context in the host context. | |
133 // TODO(rossberg): This format cannot yet handle exports of modules declared | |
134 // in earlier scripts. | |
135 String* name(int i) { return String::cast(get(name_offset(i))); } | |
136 VariableMode mode(int i) { | |
137 return static_cast<VariableMode>(Smi::cast(get(mode_offset(i)))->value()); | |
138 } | |
139 int index(int i) { return Smi::cast(get(index_offset(i)))->value(); } | |
140 | |
141 int length() { return (FixedArray::length() - HEADER_SIZE) / ITEM_SIZE; } | |
142 | |
143 private: | |
144 // The internal format is: Index, (Name, VariableMode, Index)* | |
145 enum { | |
146 HOST_OFFSET, | |
147 NAME_OFFSET, | |
148 MODE_OFFSET, | |
149 INDEX_OFFSET, | |
150 HEADER_SIZE = NAME_OFFSET, | |
151 ITEM_SIZE = INDEX_OFFSET - NAME_OFFSET + 1 | |
152 }; | |
153 inline int name_offset(int i) { return NAME_OFFSET + i * ITEM_SIZE; } | |
154 inline int mode_offset(int i) { return MODE_OFFSET + i * ITEM_SIZE; } | |
155 inline int index_offset(int i) { return INDEX_OFFSET + i * ITEM_SIZE; } | |
156 | |
157 static Handle<ModuleInfo> Allocate(Isolate* isolate, int length) { | |
158 return Handle<ModuleInfo>::cast( | |
159 isolate->factory()->NewFixedArray(HEADER_SIZE + ITEM_SIZE * length)); | |
160 } | |
161 void set_host_index(int index) { set(HOST_OFFSET, Smi::FromInt(index)); } | |
162 void set_name(int i, String* name) { set(name_offset(i), name); } | |
163 void set_mode(int i, VariableMode mode) { | |
164 set(mode_offset(i), Smi::FromInt(mode)); | |
165 } | |
166 void set_index(int i, int index) { | |
167 set(index_offset(i), Smi::FromInt(index)); | |
168 } | |
169 }; | |
170 | |
171 | |
172 } // namespace internal | 111 } // namespace internal |
173 } // namespace v8 | 112 } // namespace v8 |
174 | 113 |
175 #endif // V8_AST_SCOPEINFO_H_ | 114 #endif // V8_AST_SCOPEINFO_H_ |
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