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| 1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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 |
| 11 // with the distribution. | 11 // with the distribution. |
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| 35 | 35 |
| 36 class Rewriter { | 36 class Rewriter { |
| 37 public: | 37 public: |
| 38 // Rewrite top-level code (ECMA 262 "programs") so as to conservatively | 38 // Rewrite top-level code (ECMA 262 "programs") so as to conservatively |
| 39 // include an assignment of the value of the last statement in the code to | 39 // include an assignment of the value of the last statement in the code to |
| 40 // a compiler-generated temporary variable wherever needed. | 40 // a compiler-generated temporary variable wherever needed. |
| 41 // | 41 // |
| 42 // Assumes code has been parsed and scopes have been analyzed. Mutates the | 42 // Assumes code has been parsed and scopes have been analyzed. Mutates the |
| 43 // AST, so the AST should not continue to be used in the case of failure. | 43 // AST, so the AST should not continue to be used in the case of failure. |
| 44 static bool Rewrite(CompilationInfo* info); | 44 static bool Rewrite(CompilationInfo* info); |
| 45 | |
| 46 // Perform a suite of simple non-iterative analyses of the AST. Mark | |
| 47 // expressions that are likely smis, expressions without side effects, | |
| 48 // expressions whose value will be converted to Int32, and expressions in a | |
| 49 // context where +0 and -0 are treated the same. | |
| 50 // | |
| 51 // Assumes code has been parsed and scopes have been analyzed. Mutates the | |
| 52 // AST, so the AST should not continue to be used in the case of failure. | |
| 53 static bool Analyze(CompilationInfo* info); | |
| 54 }; | 45 }; |
| 55 | 46 |
| 56 | 47 |
| 57 } } // namespace v8::internal | 48 } } // namespace v8::internal |
| 58 | 49 |
| 59 #endif // V8_REWRITER_H_ | 50 #endif // V8_REWRITER_H_ |
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