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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 ClassVariable; | 19 class ClassVariable; |
| 20 | 20 |
| 21 class Variable: public ZoneObject { | 21 class Variable: public ZoneObject { |
| 22 public: | 22 public: |
| 23 enum Kind { NORMAL, FUNCTION, CLASS, THIS, NEW_TARGET, ARGUMENTS }; | 23 enum Kind { NORMAL, FUNCTION, CLASS, THIS, ARGUMENTS }; |
| 24 | 24 |
| 25 enum Location { | 25 enum Location { |
| 26 // Before and during variable allocation, a variable whose location is | 26 // Before and during variable allocation, a variable whose location is |
| 27 // not yet determined. After allocation, a variable looked up as a | 27 // not yet determined. After allocation, a variable looked up as a |
| 28 // property on the global object (and possibly absent). name() is the | 28 // property on the global object (and possibly absent). name() is the |
| 29 // variable name, index() is invalid. | 29 // variable name, index() is invalid. |
| 30 UNALLOCATED, | 30 UNALLOCATED, |
| 31 | 31 |
| 32 // A slot in the parameter section on the stack. index() is the | 32 // A slot in the parameter section on the stack. index() is the |
| 33 // parameter index, counting left-to-right. The receiver is index -1; | 33 // parameter index, counting left-to-right. The receiver is index -1; |
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| 96 | 96 |
| 97 bool is_dynamic() const { return IsDynamicVariableMode(mode_); } | 97 bool is_dynamic() const { return IsDynamicVariableMode(mode_); } |
| 98 bool is_const_mode() const { return IsImmutableVariableMode(mode_); } | 98 bool is_const_mode() const { return IsImmutableVariableMode(mode_); } |
| 99 bool binding_needs_init() const { | 99 bool binding_needs_init() const { |
| 100 return initialization_flag_ == kNeedsInitialization; | 100 return initialization_flag_ == kNeedsInitialization; |
| 101 } | 101 } |
| 102 | 102 |
| 103 bool is_function() const { return kind_ == FUNCTION; } | 103 bool is_function() const { return kind_ == FUNCTION; } |
| 104 bool is_class() const { return kind_ == CLASS; } | 104 bool is_class() const { return kind_ == CLASS; } |
| 105 bool is_this() const { return kind_ == THIS; } | 105 bool is_this() const { return kind_ == THIS; } |
| 106 bool is_new_target() const { return kind_ == NEW_TARGET; } | |
| 107 bool is_arguments() const { return kind_ == ARGUMENTS; } | 106 bool is_arguments() const { return kind_ == ARGUMENTS; } |
| 108 | 107 |
| 109 ClassVariable* AsClassVariable() { | 108 ClassVariable* AsClassVariable() { |
| 110 DCHECK(is_class()); | 109 DCHECK(is_class()); |
| 111 return reinterpret_cast<ClassVariable*>(this); | 110 return reinterpret_cast<ClassVariable*>(this); |
| 112 } | 111 } |
| 113 | 112 |
| 114 // True if the variable is named eval and not known to be shadowed. | 113 // True if the variable is named eval and not known to be shadowed. |
| 115 bool is_possibly_eval(Isolate* isolate) const { | 114 bool is_possibly_eval(Isolate* isolate) const { |
| 116 return IsVariable(isolate->factory()->eval_string()); | 115 return IsVariable(isolate->factory()->eval_string()); |
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| 201 | 200 |
| 202 private: | 201 private: |
| 203 // For classes we keep track of consecutive groups of delcarations. They are | 202 // For classes we keep track of consecutive groups of delcarations. They are |
| 204 // needed for strong mode scoping checks. TODO(marja, rossberg): Implement | 203 // needed for strong mode scoping checks. TODO(marja, rossberg): Implement |
| 205 // checks for functions too. | 204 // checks for functions too. |
| 206 int declaration_group_start_; | 205 int declaration_group_start_; |
| 207 }; | 206 }; |
| 208 } } // namespace v8::internal | 207 } } // namespace v8::internal |
| 209 | 208 |
| 210 #endif // V8_VARIABLES_H_ | 209 #endif // V8_VARIABLES_H_ |
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