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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_VARIABLES_H_ | 5 #ifndef V8_VARIABLES_H_ |
6 #define V8_VARIABLES_H_ | 6 #define V8_VARIABLES_H_ |
7 | 7 |
8 #include "src/ast-value-factory.h" | |
9 #include "src/zone.h" | 8 #include "src/zone.h" |
10 #include "src/interface.h" | 9 #include "src/interface.h" |
11 | 10 |
12 namespace v8 { | 11 namespace v8 { |
13 namespace internal { | 12 namespace internal { |
14 | 13 |
15 // The AST refers to variables via VariableProxies - placeholders for the actual | 14 // The AST refers to variables via VariableProxies - placeholders for the actual |
16 // variables. Variables themselves are never directly referred to from the AST, | 15 // variables. Variables themselves are never directly referred to from the AST, |
17 // they are maintained by scopes, and referred to from VariableProxies and Slots | 16 // they are maintained by scopes, and referred to from VariableProxies and Slots |
18 // after binding and variable allocation. | 17 // after binding and variable allocation. |
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46 // corresponding scope. | 45 // corresponding scope. |
47 CONTEXT, | 46 CONTEXT, |
48 | 47 |
49 // A named slot in a heap context. name() is the variable name in the | 48 // A named slot in a heap context. name() is the variable name in the |
50 // context object on the heap, with lookup starting at the current | 49 // context object on the heap, with lookup starting at the current |
51 // context. index() is invalid. | 50 // context. index() is invalid. |
52 LOOKUP | 51 LOOKUP |
53 }; | 52 }; |
54 | 53 |
55 Variable(Scope* scope, | 54 Variable(Scope* scope, |
56 const AstString* name, | 55 Handle<String> name, |
57 VariableMode mode, | 56 VariableMode mode, |
58 bool is_valid_ref, | 57 bool is_valid_ref, |
59 Kind kind, | 58 Kind kind, |
60 InitializationFlag initialization_flag, | 59 InitializationFlag initialization_flag, |
61 Interface* interface = Interface::NewValue()); | 60 Interface* interface = Interface::NewValue()); |
62 | 61 |
63 // Printing support | 62 // Printing support |
64 static const char* Mode2String(VariableMode mode); | 63 static const char* Mode2String(VariableMode mode); |
65 | 64 |
66 bool IsValidReference() { return is_valid_ref_; } | 65 bool IsValidReference() { return is_valid_ref_; } |
67 | 66 |
68 // The source code for an eval() call may refer to a variable that is | 67 // The source code for an eval() call may refer to a variable that is |
69 // in an outer scope about which we don't know anything (it may not | 68 // in an outer scope about which we don't know anything (it may not |
70 // be the global scope). scope() is NULL in that case. Currently the | 69 // be the global scope). scope() is NULL in that case. Currently the |
71 // scope is only used to follow the context chain length. | 70 // scope is only used to follow the context chain length. |
72 Scope* scope() const { return scope_; } | 71 Scope* scope() const { return scope_; } |
73 | 72 |
74 Handle<String> name() const { return name_->string(); } | 73 Handle<String> name() const { return name_; } |
75 const AstString* raw_name() const { return name_; } | |
76 VariableMode mode() const { return mode_; } | 74 VariableMode mode() const { return mode_; } |
77 bool has_forced_context_allocation() const { | 75 bool has_forced_context_allocation() const { |
78 return force_context_allocation_; | 76 return force_context_allocation_; |
79 } | 77 } |
80 void ForceContextAllocation() { | 78 void ForceContextAllocation() { |
81 ASSERT(mode_ != TEMPORARY); | 79 ASSERT(mode_ != TEMPORARY); |
82 force_context_allocation_ = true; | 80 force_context_allocation_ = true; |
83 } | 81 } |
84 bool is_used() { return is_used_; } | 82 bool is_used() { return is_used_; } |
85 void set_is_used(bool flag) { is_used_ = flag; } | 83 void set_is_used(bool flag) { is_used_ = flag; } |
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131 | 129 |
132 void AllocateTo(Location location, int index) { | 130 void AllocateTo(Location location, int index) { |
133 location_ = location; | 131 location_ = location; |
134 index_ = index; | 132 index_ = index; |
135 } | 133 } |
136 | 134 |
137 static int CompareIndex(Variable* const* v, Variable* const* w); | 135 static int CompareIndex(Variable* const* v, Variable* const* w); |
138 | 136 |
139 private: | 137 private: |
140 Scope* scope_; | 138 Scope* scope_; |
141 const AstString* name_; | 139 Handle<String> name_; |
142 VariableMode mode_; | 140 VariableMode mode_; |
143 Kind kind_; | 141 Kind kind_; |
144 Location location_; | 142 Location location_; |
145 int index_; | 143 int index_; |
146 int initializer_position_; | 144 int initializer_position_; |
147 | 145 |
148 // If this field is set, this variable references the stored locally bound | 146 // If this field is set, this variable references the stored locally bound |
149 // variable, but it might be shadowed by variable bindings introduced by | 147 // variable, but it might be shadowed by variable bindings introduced by |
150 // sloppy 'eval' calls between the reference scope (inclusive) and the | 148 // sloppy 'eval' calls between the reference scope (inclusive) and the |
151 // binding scope (exclusive). | 149 // binding scope (exclusive). |
152 Variable* local_if_not_shadowed_; | 150 Variable* local_if_not_shadowed_; |
153 | 151 |
154 // Valid as a reference? (const and this are not valid, for example) | 152 // Valid as a reference? (const and this are not valid, for example) |
155 bool is_valid_ref_; | 153 bool is_valid_ref_; |
156 | 154 |
157 // Usage info. | 155 // Usage info. |
158 bool force_context_allocation_; // set by variable resolver | 156 bool force_context_allocation_; // set by variable resolver |
159 bool is_used_; | 157 bool is_used_; |
160 InitializationFlag initialization_flag_; | 158 InitializationFlag initialization_flag_; |
161 | 159 |
162 // Module type info. | 160 // Module type info. |
163 Interface* interface_; | 161 Interface* interface_; |
164 }; | 162 }; |
165 | 163 |
166 | 164 |
167 } } // namespace v8::internal | 165 } } // namespace v8::internal |
168 | 166 |
169 #endif // V8_VARIABLES_H_ | 167 #endif // V8_VARIABLES_H_ |
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