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 3 // found in the LICENSE file. 4 5 #ifndef V8_PARSING_REWRITER_H_ 6 #define V8_PARSING_REWRITER_H_ 7 8 namespace v8 { 9 namespace internal { 10 11 class AstValueFactory; 12 class DoExpression; 13 class ParseInfo; 14 class Parser; 15 class DeclarationScope; 16 class Scope; 17 18 class Rewriter { 19 public: 20 // Rewrite top-level code (ECMA 262 "programs") so as to conservatively 21 // include an assignment of the value of the last statement in the code to 22 // a compiler-generated temporary variable wherever needed. 23 // 24 // Assumes code has been parsed and scopes have been analyzed. Mutates the 25 // AST, so the AST should not continue to be used in the case of failure. 26 static bool Rewrite(ParseInfo* info); 27 28 // Rewrite a list of statements, using the same rules as a top-level program, 29 // to ensure identical behaviour of completion result. The temporary is added 30 // to the closure scope of the do-expression, which matches the closure scope 31 // of the outer scope (the do-expression itself runs in a block scope, not a 32 // closure scope). This closure scope needs to be passed in since the 33 // do-expression could have dropped its own block scope. 34 static bool Rewrite(Parser* parser, DeclarationScope* closure_scope, 35 DoExpression* expr, AstValueFactory* factory); 36 }; 37 38 39 } // namespace internal 40 } // namespace v8 41 42 #endif // V8_PARSING_REWRITER_H_ 43