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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" | 8 #include "src/ast-value-factory.h" |
9 #include "src/zone.h" | 9 #include "src/zone.h" |
10 | 10 |
11 namespace v8 { | 11 namespace v8 { |
12 namespace internal { | 12 namespace internal { |
13 | 13 |
14 // The AST refers to variables via VariableProxies - placeholders for the actual | 14 // The AST refers to variables via VariableProxies - placeholders for the actual |
15 // variables. Variables themselves are never directly referred to from the AST, | 15 // variables. Variables themselves are never directly referred to from the AST, |
16 // 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 |
17 // after binding and variable allocation. | 17 // after binding and variable allocation. |
18 | 18 |
19 class Variable: public ZoneObject { | 19 class Variable: public ZoneObject { |
20 public: | 20 public: |
21 enum Kind { NORMAL, FUNCTION, THIS, NEW_TARGET, ARGUMENTS }; | 21 enum Kind { NORMAL, FUNCTION, CLASS, THIS, NEW_TARGET, ARGUMENTS }; |
22 | 22 |
23 enum Location { | 23 enum Location { |
24 // Before and during variable allocation, a variable whose location is | 24 // Before and during variable allocation, a variable whose location is |
25 // not yet determined. After allocation, a variable looked up as a | 25 // not yet determined. After allocation, a variable looked up as a |
26 // property on the global object (and possibly absent). name() is the | 26 // property on the global object (and possibly absent). name() is the |
27 // variable name, index() is invalid. | 27 // variable name, index() is invalid. |
28 UNALLOCATED, | 28 UNALLOCATED, |
29 | 29 |
30 // A slot in the parameter section on the stack. index() is the | 30 // A slot in the parameter section on the stack. index() is the |
31 // parameter index, counting left-to-right. The receiver is index -1; | 31 // parameter index, counting left-to-right. The receiver is index -1; |
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90 bool IsLookupSlot() const { return location_ == LOOKUP; } | 90 bool IsLookupSlot() const { return location_ == LOOKUP; } |
91 bool IsGlobalObjectProperty() const; | 91 bool IsGlobalObjectProperty() const; |
92 | 92 |
93 bool is_dynamic() const { return IsDynamicVariableMode(mode_); } | 93 bool is_dynamic() const { return IsDynamicVariableMode(mode_); } |
94 bool is_const_mode() const { return IsImmutableVariableMode(mode_); } | 94 bool is_const_mode() const { return IsImmutableVariableMode(mode_); } |
95 bool binding_needs_init() const { | 95 bool binding_needs_init() const { |
96 return initialization_flag_ == kNeedsInitialization; | 96 return initialization_flag_ == kNeedsInitialization; |
97 } | 97 } |
98 | 98 |
99 bool is_function() const { return kind_ == FUNCTION; } | 99 bool is_function() const { return kind_ == FUNCTION; } |
| 100 bool is_class() const { return kind_ == CLASS; } |
100 bool is_this() const { return kind_ == THIS; } | 101 bool is_this() const { return kind_ == THIS; } |
101 bool is_new_target() const { return kind_ == NEW_TARGET; } | 102 bool is_new_target() const { return kind_ == NEW_TARGET; } |
102 bool is_arguments() const { return kind_ == ARGUMENTS; } | 103 bool is_arguments() const { return kind_ == ARGUMENTS; } |
103 | 104 |
104 // True if the variable is named eval and not known to be shadowed. | 105 // True if the variable is named eval and not known to be shadowed. |
105 bool is_possibly_eval(Isolate* isolate) const { | 106 bool is_possibly_eval(Isolate* isolate) const { |
106 return IsVariable(isolate->factory()->eval_string()); | 107 return IsVariable(isolate->factory()->eval_string()); |
107 } | 108 } |
108 | 109 |
109 Variable* local_if_not_shadowed() const { | 110 Variable* local_if_not_shadowed() const { |
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171 bool force_context_allocation_; // set by variable resolver | 172 bool force_context_allocation_; // set by variable resolver |
172 bool is_used_; | 173 bool is_used_; |
173 InitializationFlag initialization_flag_; | 174 InitializationFlag initialization_flag_; |
174 MaybeAssignedFlag maybe_assigned_; | 175 MaybeAssignedFlag maybe_assigned_; |
175 }; | 176 }; |
176 | 177 |
177 | 178 |
178 } } // namespace v8::internal | 179 } } // namespace v8::internal |
179 | 180 |
180 #endif // V8_VARIABLES_H_ | 181 #endif // V8_VARIABLES_H_ |
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