Add parser support for generators.

src/ast.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 84 matching lines @@
 #define EXPRESSION_NODE_LIST(V)                 \
   V(FunctionLiteral)                            \
   V(SharedFunctionInfoLiteral)                  \
   V(Conditional)                                \
   V(VariableProxy)                              \
   V(Literal)                                    \
   V(RegExpLiteral)                              \
   V(ObjectLiteral)                              \
   V(ArrayLiteral)                               \
   V(Assignment)                                 \
+  V(Yield)                                      \
   V(Throw)                                      \
   V(Property)                                   \
   V(Call)                                       \
   V(CallNew)                                    \
   V(CallRuntime)                                \
   V(UnaryOperation)                             \
   V(CountOperation)                             \
   V(BinaryOperation)                            \
   V(CompareOperation)                           \
   V(ThisFunction)
@@ skipping 1831 matching lines @@
   int pos_;
   BinaryOperation* binary_operation_;
   const BailoutId assignment_id_;
 
   bool is_monomorphic_ : 1;
   KeyedAccessStoreMode store_mode_ : 4;
   SmallMapList receiver_types_;
 };
 
 
+class Yield: public Expression {
+ public:
+  DECLARE_NODE_TYPE(Yield)
+
+  Expression* expression() const { return expression_; }
+  bool is_delegating_yield() const { return is_delegating_yield_; }
+  virtual int position() const { return pos_; }
+
+ protected:
+  Yield(Isolate* isolate,
+        Expression* expression,
+        bool is_delegating_yield,
+        int pos)
+      : Expression(isolate),
+        expression_(expression),
+        is_delegating_yield_(is_delegating_yield),
+        pos_(pos) { }
+
+ private:
+  Expression* expression_;
+  bool is_delegating_yield_;
+  int pos_;
+};
+
+
 class Throw: public Expression {
  public:
   DECLARE_NODE_TYPE(Throw)
 
   Expression* exception() const { return exception_; }
   virtual int position() const { return pos_; }
 
  protected:
   Throw(Isolate* isolate, Expression* exception, int pos)
       : Expression(isolate), exception_(exception), pos_(pos) {}
@@ skipping 20 matching lines @@
   enum IsFunctionFlag {
     kGlobalOrEval,
     kIsFunction
   };
 
   enum IsParenthesizedFlag {
     kIsParenthesized,
     kNotParenthesized
   };
 
+  enum IsGeneratorFlag {
+    kIsGenerator,
+    kNotGenerator
+  };
+
   DECLARE_NODE_TYPE(FunctionLiteral)
 
   Handle<String> name() const { return name_; }
   Scope* scope() const { return scope_; }
   ZoneList<Statement*>* body() const { return body_; }
   void set_function_token_position(int pos) { function_token_position_ = pos; }
   int function_token_position() const { return function_token_position_; }
   int start_position() const;
   int end_position() const;
   int SourceSize() const { return end_position() - start_position(); }
@@ skipping 40 matching lines @@
   // function will be called immediately:
   // - (function() { ... })();
   // - var x = function() { ... }();
   bool is_parenthesized() {
     return IsParenthesized::decode(bitfield_) == kIsParenthesized;
   }
   void set_parenthesized() {
     bitfield_ = IsParenthesized::update(bitfield_, kIsParenthesized);
   }
 
+  bool is_generator() {
+    return IsGenerator::decode(bitfield_) == kIsGenerator;
+  }
+
   int ast_node_count() { return ast_properties_.node_count(); }
   AstProperties::Flags* flags() { return ast_properties_.flags(); }
   void set_ast_properties(AstProperties* ast_properties) {
     ast_properties_ = *ast_properties;
   }
 
  protected:
   FunctionLiteral(Isolate* isolate,
                   Handle<String> name,
                   Scope* scope,
                   ZoneList<Statement*>* body,
                   int materialized_literal_count,
                   int expected_property_count,
                   int handler_count,
                   bool has_only_simple_this_property_assignments,
                   Handle<FixedArray> this_property_assignments,
                   int parameter_count,
                   Type type,
                   ParameterFlag has_duplicate_parameters,
                   IsFunctionFlag is_function,
-                  IsParenthesizedFlag is_parenthesized)
+                  IsParenthesizedFlag is_parenthesized,
+                  IsGeneratorFlag is_generator)
       : Expression(isolate),
         name_(name),
         scope_(scope),
         body_(body),
         this_property_assignments_(this_property_assignments),
         inferred_name_(isolate->factory()->empty_string()),
         materialized_literal_count_(materialized_literal_count),
         expected_property_count_(expected_property_count),
         handler_count_(handler_count),
         parameter_count_(parameter_count),
         function_token_position_(RelocInfo::kNoPosition) {
     bitfield_ =
         HasOnlySimpleThisPropertyAssignments::encode(
             has_only_simple_this_property_assignments) |
         IsExpression::encode(type != DECLARATION) |
         IsAnonymous::encode(type == ANONYMOUS_EXPRESSION) |
         Pretenure::encode(false) |
         HasDuplicateParameters::encode(has_duplicate_parameters) |
         IsFunction::encode(is_function) |
-        IsParenthesized::encode(is_parenthesized);
+        IsParenthesized::encode(is_parenthesized) |
+        IsGenerator::encode(is_generator);
   }
 
  private:
   Handle<String> name_;
   Scope* scope_;
   ZoneList<Statement*>* body_;
   Handle<FixedArray> this_property_assignments_;
   Handle<String> inferred_name_;
   AstProperties ast_properties_;
 
   int materialized_literal_count_;
   int expected_property_count_;
   int handler_count_;
   int parameter_count_;
   int function_token_position_;
 
   unsigned bitfield_;
   class HasOnlySimpleThisPropertyAssignments: public BitField<bool, 0, 1> {};
   class IsExpression: public BitField<bool, 1, 1> {};
   class IsAnonymous: public BitField<bool, 2, 1> {};
   class Pretenure: public BitField<bool, 3, 1> {};
   class HasDuplicateParameters: public BitField<ParameterFlag, 4, 1> {};
   class IsFunction: public BitField<IsFunctionFlag, 5, 1> {};
   class IsParenthesized: public BitField<IsParenthesizedFlag, 6, 1> {};
+  class IsGenerator: public BitField<IsGeneratorFlag, 7, 1> {};
 };
 
 
 class SharedFunctionInfoLiteral: public Expression {
  public:
   DECLARE_NODE_TYPE(SharedFunctionInfoLiteral)
 
   Handle<SharedFunctionInfo> shared_function_info() const {
     return shared_function_info_;
   }
@@ skipping 778 matching lines @@
   Assignment* NewAssignment(Token::Value op,
                             Expression* target,
                             Expression* value,
                             int pos) {
     Assignment* assign =
         new(zone_) Assignment(isolate_, op, target, value, pos);
     assign->Init(isolate_, this);
     VISIT_AND_RETURN(Assignment, assign)
   }
 
+  Yield* NewYield(Expression* expression, bool is_delegating_yield, int pos) {
+    Yield* yield =
+        new(zone_) Yield(isolate_, expression, is_delegating_yield, pos);
+    VISIT_AND_RETURN(Yield, yield)
+  }
+
   Throw* NewThrow(Expression* exception, int pos) {
     Throw* t = new(zone_) Throw(isolate_, exception, pos);
     VISIT_AND_RETURN(Throw, t)
   }
 
   FunctionLiteral* NewFunctionLiteral(
       Handle<String> name,
       Scope* scope,
       ZoneList<Statement*>* body,
       int materialized_literal_count,
       int expected_property_count,
       int handler_count,
       bool has_only_simple_this_property_assignments,
       Handle<FixedArray> this_property_assignments,
       int parameter_count,
       FunctionLiteral::ParameterFlag has_duplicate_parameters,
       FunctionLiteral::Type type,
       FunctionLiteral::IsFunctionFlag is_function,
-      FunctionLiteral::IsParenthesizedFlag is_parenthesized) {
+      FunctionLiteral::IsParenthesizedFlag is_parenthesized,
+      FunctionLiteral::IsGeneratorFlag is_generator) {
     FunctionLiteral* lit = new(zone_) FunctionLiteral(
         isolate_, name, scope, body,
         materialized_literal_count, expected_property_count, handler_count,
         has_only_simple_this_property_assignments, this_property_assignments,
         parameter_count, type, has_duplicate_parameters, is_function,
-        is_parenthesized);
+        is_parenthesized, is_generator);
     // Top-level literal doesn't count for the AST's properties.
     if (is_function == FunctionLiteral::kIsFunction) {
       visitor_.VisitFunctionLiteral(lit);
     }
     return lit;
   }
 
   SharedFunctionInfoLiteral* NewSharedFunctionInfoLiteral(
       Handle<SharedFunctionInfo> shared_function_info) {
     SharedFunctionInfoLiteral* lit =
@@ skipping 11 matching lines @@
  private:
   Isolate* isolate_;
   Zone* zone_;
   Visitor visitor_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_