Baseline for-of implementation

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 873 matching lines @@
 
   void Initialize(Expression* each, Expression* subject, Statement* body) {
     IterationStatement::Initialize(body);
     each_ = each;
     subject_ = subject;
   }
 
   Expression* each() const { return each_; }
   Expression* subject() const { return subject_; }
 
-  virtual BailoutId ContinueId() const { return EntryId(); }
-  virtual BailoutId StackCheckId() const { return body_id_; }
-  BailoutId BodyId() const { return body_id_; }
-  BailoutId PrepareId() const { return prepare_id_; }
-
  protected:
   ForEachStatement(Isolate* isolate, ZoneStringList* labels)
       : IterationStatement(isolate, labels),
         each_(NULL),
-        subject_(NULL),
-        body_id_(GetNextId(isolate)),
-        prepare_id_(GetNextId(isolate)) {
+        subject_(NULL) {
   }
 
  private:
   Expression* each_;
   Expression* subject_;
-  const BailoutId body_id_;
-  const BailoutId prepare_id_;
 };
 
 
 class ForInStatement: public ForEachStatement {
  public:
   DECLARE_NODE_TYPE(ForInStatement)
 
   Expression* enumerable() const {
     return subject();
   }
 
   TypeFeedbackId ForInFeedbackId() const { return reuse(PrepareId()); }
   void RecordTypeFeedback(TypeFeedbackOracle* oracle);
   enum ForInType { FAST_FOR_IN, SLOW_FOR_IN };
   ForInType for_in_type() const { return for_in_type_; }
 
+  BailoutId BodyId() const { return body_id_; }
+  BailoutId PrepareId() const { return prepare_id_; }
+  virtual BailoutId ContinueId() const { return EntryId(); }
+  virtual BailoutId StackCheckId() const { return body_id_; }
+
  protected:
   ForInStatement(Isolate* isolate, ZoneStringList* labels)
       : ForEachStatement(isolate, labels),
-        for_in_type_(SLOW_FOR_IN) {
+        for_in_type_(SLOW_FOR_IN),
+        body_id_(GetNextId(isolate)),
+        prepare_id_(GetNextId(isolate)) {
   }
 
   ForInType for_in_type_;
+  const BailoutId body_id_;
+  const BailoutId prepare_id_;
 };
 
 
 class ForOfStatement: public ForEachStatement {
  public:
   DECLARE_NODE_TYPE(ForOfStatement)
 
+  void Initialize(Expression* each,
+                  Expression* subject,
+                  Statement* body,
+                  Expression* assign_iterator,
+                  Expression* next_result,
+                  Expression* result_done,
+                  Expression* assign_each) {
+    ForEachStatement::Initialize(each, subject, body);
+    assign_iterator_ = assign_iterator;
+    next_result_ = next_result;
+    result_done_ = result_done;
+    assign_each_ = assign_each;
+  }
+
   Expression* iterable() const {
     return subject();
   }
 
+  // var iterator = iterable;
+  Expression* assign_iterator() const {
+    return assign_iterator_;
+  }
+
+  // var result = iterator.next();
+  Expression* next_result() const {
+    return next_result_;
+  }
+
+  // result.done
+  Expression* result_done() const {
+    return result_done_;
+  }
+
+  // each = result.value
+  Expression* assign_each() const {
+    return assign_each_;
+  }
+
+  virtual BailoutId ContinueId() const { return EntryId(); }
+  virtual BailoutId StackCheckId() const { return BackEdgeId(); }
+
+  BailoutId BackEdgeId() const { return back_edge_id_; }
+
  protected:
   ForOfStatement(Isolate* isolate, ZoneStringList* labels)
-      : ForEachStatement(isolate, labels) {
+      : ForEachStatement(isolate, labels),
+        assign_iterator_(NULL),
+        next_result_(NULL),
+        result_done_(NULL),
+        assign_each_(NULL),
+        back_edge_id_(GetNextId(isolate)) {
   }
+
+  Expression* assign_iterator_;
+  Expression* next_result_;
+  Expression* result_done_;
+  Expression* assign_each_;
+  const BailoutId back_edge_id_;
 };
 
 
 class ExpressionStatement: public Statement {
  public:
   DECLARE_NODE_TYPE(ExpressionStatement)
 
   void set_expression(Expression* e) { expression_ = e; }
   Expression* expression() const { return expression_; }
 
@@ skipping 2215 matching lines @@
  private:
   Isolate* isolate_;
   Zone* zone_;
   Visitor visitor_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_