OLD | NEW |
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/interface.h" | 9 #include "src/interface.h" |
10 #include "src/zone.h" | 10 #include "src/zone.h" |
11 | 11 |
12 namespace v8 { | 12 namespace v8 { |
13 namespace internal { | 13 namespace internal { |
14 | 14 |
15 // The AST refers to variables via VariableProxies - placeholders for the actual | 15 // The AST refers to variables via VariableProxies - placeholders for the actual |
16 // variables. Variables themselves are never directly referred to from the AST, | 16 // variables. Variables themselves are never directly referred to from the AST, |
17 // they are maintained by scopes, and referred to from VariableProxies and Slots | 17 // they are maintained by scopes, and referred to from VariableProxies and Slots |
18 // after binding and variable allocation. | 18 // after binding and variable allocation. |
19 | 19 |
20 class Variable: public ZoneObject { | 20 class Variable: public ZoneObject { |
21 public: | 21 public: |
22 enum Kind { NORMAL, THIS, NEW_TARGET, ARGUMENTS }; | 22 enum Kind { |
| 23 NORMAL, |
| 24 THIS, |
| 25 ARGUMENTS |
| 26 }; |
23 | 27 |
24 enum Location { | 28 enum Location { |
25 // Before and during variable allocation, a variable whose location is | 29 // Before and during variable allocation, a variable whose location is |
26 // not yet determined. After allocation, a variable looked up as a | 30 // not yet determined. After allocation, a variable looked up as a |
27 // property on the global object (and possibly absent). name() is the | 31 // property on the global object (and possibly absent). name() is the |
28 // variable name, index() is invalid. | 32 // variable name, index() is invalid. |
29 UNALLOCATED, | 33 UNALLOCATED, |
30 | 34 |
31 // A slot in the parameter section on the stack. index() is the | 35 // A slot in the parameter section on the stack. index() is the |
32 // parameter index, counting left-to-right. The receiver is index -1; | 36 // parameter index, counting left-to-right. The receiver is index -1; |
(...skipping 61 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
94 bool IsLookupSlot() const { return location_ == LOOKUP; } | 98 bool IsLookupSlot() const { return location_ == LOOKUP; } |
95 bool IsGlobalObjectProperty() const; | 99 bool IsGlobalObjectProperty() const; |
96 | 100 |
97 bool is_dynamic() const { return IsDynamicVariableMode(mode_); } | 101 bool is_dynamic() const { return IsDynamicVariableMode(mode_); } |
98 bool is_const_mode() const { return IsImmutableVariableMode(mode_); } | 102 bool is_const_mode() const { return IsImmutableVariableMode(mode_); } |
99 bool binding_needs_init() const { | 103 bool binding_needs_init() const { |
100 return initialization_flag_ == kNeedsInitialization; | 104 return initialization_flag_ == kNeedsInitialization; |
101 } | 105 } |
102 | 106 |
103 bool is_this() const { return kind_ == THIS; } | 107 bool is_this() const { return kind_ == THIS; } |
104 bool is_new_target() const { return kind_ == NEW_TARGET; } | |
105 bool is_arguments() const { return kind_ == ARGUMENTS; } | 108 bool is_arguments() const { return kind_ == ARGUMENTS; } |
106 | 109 |
107 // True if the variable is named eval and not known to be shadowed. | 110 // True if the variable is named eval and not known to be shadowed. |
108 bool is_possibly_eval(Isolate* isolate) const { | 111 bool is_possibly_eval(Isolate* isolate) const { |
109 return IsVariable(isolate->factory()->eval_string()); | 112 return IsVariable(isolate->factory()->eval_string()); |
110 } | 113 } |
111 | 114 |
112 Variable* local_if_not_shadowed() const { | 115 Variable* local_if_not_shadowed() const { |
113 DCHECK(mode_ == DYNAMIC_LOCAL && local_if_not_shadowed_ != NULL); | 116 DCHECK(mode_ == DYNAMIC_LOCAL && local_if_not_shadowed_ != NULL); |
114 return local_if_not_shadowed_; | 117 return local_if_not_shadowed_; |
(...skipping 42 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
157 MaybeAssignedFlag maybe_assigned_; | 160 MaybeAssignedFlag maybe_assigned_; |
158 | 161 |
159 // Module type info. | 162 // Module type info. |
160 Interface* interface_; | 163 Interface* interface_; |
161 }; | 164 }; |
162 | 165 |
163 | 166 |
164 } } // namespace v8::internal | 167 } } // namespace v8::internal |
165 | 168 |
166 #endif // V8_VARIABLES_H_ | 169 #endif // V8_VARIABLES_H_ |
OLD | NEW |