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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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180 kTestValue | 180 kTestValue |
181 }; | 181 }; |
182 | 182 |
183 Expression() : context_(kUninitialized) {} | 183 Expression() : context_(kUninitialized) {} |
184 | 184 |
185 virtual Expression* AsExpression() { return this; } | 185 virtual Expression* AsExpression() { return this; } |
186 | 186 |
187 virtual bool IsValidJSON() { return false; } | 187 virtual bool IsValidJSON() { return false; } |
188 virtual bool IsValidLeftHandSide() { return false; } | 188 virtual bool IsValidLeftHandSide() { return false; } |
189 | 189 |
| 190 // Symbols that cannot be parsed as array indices are considered property |
| 191 // names. We do not treat symbols that can be array indexes as property |
| 192 // names because [] for string objects is handled only by keyed ICs. |
| 193 virtual bool IsPropertyName() { return false; } |
| 194 |
190 // Mark the expression as being compiled as an expression | 195 // Mark the expression as being compiled as an expression |
191 // statement. This is used to transform postfix increments to | 196 // statement. This is used to transform postfix increments to |
192 // (faster) prefix increments. | 197 // (faster) prefix increments. |
193 virtual void MarkAsStatement() { /* do nothing */ } | 198 virtual void MarkAsStatement() { /* do nothing */ } |
194 | 199 |
195 // Static type information for this expression. | 200 // Static type information for this expression. |
196 StaticType* type() { return &type_; } | 201 StaticType* type() { return &type_; } |
197 | 202 |
198 Context context() { return context_; } | 203 Context context() { return context_; } |
199 void set_context(Context context) { context_ = context; } | 204 void set_context(Context context) { context_ = context; } |
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700 // Type testing & conversion. | 705 // Type testing & conversion. |
701 virtual Literal* AsLiteral() { return this; } | 706 virtual Literal* AsLiteral() { return this; } |
702 | 707 |
703 // Check if this literal is identical to the other literal. | 708 // Check if this literal is identical to the other literal. |
704 bool IsIdenticalTo(const Literal* other) const { | 709 bool IsIdenticalTo(const Literal* other) const { |
705 return handle_.is_identical_to(other->handle_); | 710 return handle_.is_identical_to(other->handle_); |
706 } | 711 } |
707 | 712 |
708 virtual bool IsValidJSON() { return true; } | 713 virtual bool IsValidJSON() { return true; } |
709 | 714 |
| 715 virtual bool IsPropertyName() { |
| 716 if (handle_->IsSymbol()) { |
| 717 uint32_t ignored; |
| 718 return !String::cast(*handle_)->AsArrayIndex(&ignored); |
| 719 } |
| 720 return false; |
| 721 } |
| 722 |
710 // Identity testers. | 723 // Identity testers. |
711 bool IsNull() const { return handle_.is_identical_to(Factory::null_value()); } | 724 bool IsNull() const { return handle_.is_identical_to(Factory::null_value()); } |
712 bool IsTrue() const { return handle_.is_identical_to(Factory::true_value()); } | 725 bool IsTrue() const { return handle_.is_identical_to(Factory::true_value()); } |
713 bool IsFalse() const { | 726 bool IsFalse() const { |
714 return handle_.is_identical_to(Factory::false_value()); | 727 return handle_.is_identical_to(Factory::false_value()); |
715 } | 728 } |
716 | 729 |
717 Handle<Object> handle() const { return handle_; } | 730 Handle<Object> handle() const { return handle_; } |
718 | 731 |
719 private: | 732 private: |
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1796 #undef DEF_VISIT | 1809 #undef DEF_VISIT |
1797 | 1810 |
1798 private: | 1811 private: |
1799 bool stack_overflow_; | 1812 bool stack_overflow_; |
1800 }; | 1813 }; |
1801 | 1814 |
1802 | 1815 |
1803 } } // namespace v8::internal | 1816 } } // namespace v8::internal |
1804 | 1817 |
1805 #endif // V8_AST_H_ | 1818 #endif // V8_AST_H_ |
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