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 #include "src/base/macros.h" 9 #include "src/base/optional.h" 10 #include "src/zone/zone-type-traits.h" 11 12 namespace v8 { 13 namespace internal { 14 15 class AstValueFactory; 16 class Isolate; 17 class ParseInfo; 18 class Parser; 19 class DeclarationScope; 20 class Scope; 21 class Statement; 22 class VariableProxy; 23 24 class Rewriter { 25 public: 26 // Rewrite top-level code (ECMA 262 "programs") so as to conservatively 27 // include an assignment of the value of the last statement in the code to 28 // a compiler-generated temporary variable wherever needed. 29 // 30 // Assumes code has been parsed and scopes have been analyzed. Mutates the 31 // AST, so the AST should not continue to be used in the case of failure. 32 V8_EXPORT_PRIVATE static bool Rewrite(ParseInfo* info); 33 34 // Helper that does the actual re-writing. Extracted so REPL scripts can 35 // rewrite the body but then use the ".result" VariableProxy to resolve 36 // the async promise that is the result of running a REPL script. 37 // Returns base::nullopt in case something went wrong. 38 static base::Optional<VariableProxy*> RewriteBody( 39 ParseInfo* info, Scope* scope, ZonePtrList<Statement>* body); 40 }; 41 42 43 } // namespace internal 44 } // namespace v8 45 46 #endif // V8_PARSING_REWRITER_H_ 47