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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 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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924 | 924 |
925 virtual bool IsValidLeftHandSide() { | 925 virtual bool IsValidLeftHandSide() { |
926 return var_ == NULL ? true : var_->IsValidLeftHandSide(); | 926 return var_ == NULL ? true : var_->IsValidLeftHandSide(); |
927 } | 927 } |
928 | 928 |
929 virtual bool IsLeaf() { | 929 virtual bool IsLeaf() { |
930 ASSERT(var_ != NULL); // Variable must be resolved. | 930 ASSERT(var_ != NULL); // Variable must be resolved. |
931 return var()->is_global() || var()->rewrite()->IsLeaf(); | 931 return var()->is_global() || var()->rewrite()->IsLeaf(); |
932 } | 932 } |
933 | 933 |
| 934 // Reading from a mutable variable is a side effect, but 'this' is |
| 935 // immutable. |
| 936 virtual bool IsTrivial() { return is_this(); } |
| 937 |
934 bool IsVariable(Handle<String> n) { | 938 bool IsVariable(Handle<String> n) { |
935 return !is_this() && name().is_identical_to(n); | 939 return !is_this() && name().is_identical_to(n); |
936 } | 940 } |
937 | 941 |
938 bool IsArguments() { | 942 bool IsArguments() { |
939 Variable* variable = AsVariable(); | 943 Variable* variable = AsVariable(); |
940 return (variable == NULL) ? false : variable->is_arguments(); | 944 return (variable == NULL) ? false : variable->is_arguments(); |
941 } | 945 } |
942 | 946 |
943 Handle<String> name() const { return name_; } | 947 Handle<String> name() const { return name_; } |
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1845 #undef DEF_VISIT | 1849 #undef DEF_VISIT |
1846 | 1850 |
1847 private: | 1851 private: |
1848 bool stack_overflow_; | 1852 bool stack_overflow_; |
1849 }; | 1853 }; |
1850 | 1854 |
1851 | 1855 |
1852 } } // namespace v8::internal | 1856 } } // namespace v8::internal |
1853 | 1857 |
1854 #endif // V8_AST_H_ | 1858 #endif // V8_AST_H_ |
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