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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 // 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_SCOPES_H_ | 5 #ifndef V8_AST_SCOPES_H_ |
6 #define V8_AST_SCOPES_H_ | 6 #define V8_AST_SCOPES_H_ |
7 | 7 |
8 #include "src/ast/ast.h" | |
9 #include "src/base/compiler-specific.h" | 8 #include "src/base/compiler-specific.h" |
10 #include "src/base/hashmap.h" | 9 #include "src/base/hashmap.h" |
11 #include "src/globals.h" | 10 #include "src/globals.h" |
12 #include "src/objects.h" | 11 #include "src/objects.h" |
13 #include "src/zone/zone.h" | 12 #include "src/zone/zone.h" |
14 | 13 |
15 namespace v8 { | 14 namespace v8 { |
16 namespace internal { | 15 namespace internal { |
17 | 16 |
18 class AstNodeFactory; | 17 class AstNodeFactory; |
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202 Variable* DeclareVariableName(const AstRawString* name, VariableMode mode); | 201 Variable* DeclareVariableName(const AstRawString* name, VariableMode mode); |
203 | 202 |
204 // Declarations list. | 203 // Declarations list. |
205 ThreadedList<Declaration>* declarations() { return &decls_; } | 204 ThreadedList<Declaration>* declarations() { return &decls_; } |
206 | 205 |
207 ThreadedList<Variable>* locals() { return &locals_; } | 206 ThreadedList<Variable>* locals() { return &locals_; } |
208 | 207 |
209 // Create a new unresolved variable. | 208 // Create a new unresolved variable. |
210 VariableProxy* NewUnresolved(AstNodeFactory* factory, | 209 VariableProxy* NewUnresolved(AstNodeFactory* factory, |
211 const AstRawString* name, | 210 const AstRawString* name, |
212 int start_pos = kNoSourcePosition, | 211 int start_position = kNoSourcePosition, |
213 VariableKind kind = NORMAL_VARIABLE) { | 212 VariableKind kind = NORMAL_VARIABLE); |
214 // Note that we must not share the unresolved variables with | |
215 // the same name because they may be removed selectively via | |
216 // RemoveUnresolved(). | |
217 DCHECK(!already_resolved_); | |
218 DCHECK_EQ(factory->zone(), zone()); | |
219 VariableProxy* proxy = factory->NewVariableProxy(name, kind, start_pos); | |
220 proxy->set_next_unresolved(unresolved_); | |
221 unresolved_ = proxy; | |
222 return proxy; | |
223 } | |
224 | 213 |
225 void AddUnresolved(VariableProxy* proxy); | 214 void AddUnresolved(VariableProxy* proxy); |
226 | 215 |
227 // Remove a unresolved variable. During parsing, an unresolved variable | 216 // Remove a unresolved variable. During parsing, an unresolved variable |
228 // may have been added optimistically, but then only the variable name | 217 // may have been added optimistically, but then only the variable name |
229 // was used (typically for labels). If the variable was not declared, the | 218 // was used (typically for labels). If the variable was not declared, the |
230 // addition introduced a new unresolved variable which may end up being | 219 // addition introduced a new unresolved variable which may end up being |
231 // allocated globally as a "ghost" variable. RemoveUnresolved removes | 220 // allocated globally as a "ghost" variable. RemoveUnresolved removes |
232 // such a variable again if it was added; otherwise this is a no-op. | 221 // such a variable again if it was added; otherwise this is a no-op. |
233 bool RemoveUnresolved(VariableProxy* var); | 222 bool RemoveUnresolved(VariableProxy* var); |
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1024 void AllocateModuleVariables(); | 1013 void AllocateModuleVariables(); |
1025 | 1014 |
1026 private: | 1015 private: |
1027 ModuleDescriptor* module_descriptor_; | 1016 ModuleDescriptor* module_descriptor_; |
1028 }; | 1017 }; |
1029 | 1018 |
1030 } // namespace internal | 1019 } // namespace internal |
1031 } // namespace v8 | 1020 } // namespace v8 |
1032 | 1021 |
1033 #endif // V8_AST_SCOPES_H_ | 1022 #endif // V8_AST_SCOPES_H_ |
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