WIP: Implement ES6 Spread-calls

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index e457e66a215f1aed49d48e5c54ffed107b29cca9..6b11e2ee6e51f84663b4455ebecccacaf1507c55 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -93,6 +93,7 @@ namespace internal {
   V(CountOperation)             \
   V(BinaryOperation)            \
   V(CompareOperation)           \
+  V(SpreadOperation)            \
   V(ThisFunction)               \
   V(SuperReference)             \
   V(CaseClause)
@@ -128,6 +129,9 @@ class RegExpLookahead;
 class RegExpQuantifier;
 class RegExpText;
 
+// Other forward declarations
+class Scope;
+
 #define DEF_FORWARD_DECLARATION(type) class type;
 AST_NODE_LIST(DEF_FORWARD_DECLARATION)
 #undef DEF_FORWARD_DECLARATION
@@ -1891,6 +1895,14 @@ class Call FINAL : public Expression {
   bool return_is_recorded_;
 #endif
 
+  inline void MarkSpreadCall() {
+    bit_field_ |= HasSpreadArgumentsField::encode(true);
+  }
+
+  inline bool HasSpreadArguments() const {
+    return HasSpreadArgumentsField::decode(bit_field_);
+  }
+
  protected:
   Call(Zone* zone, Expression* expression, ZoneList<Expression*>* arguments,
        int pos)
@@ -1898,7 +1910,9 @@ class Call FINAL : public Expression {
         ic_slot_or_slot_(FeedbackVectorICSlot::Invalid().ToInt()),
         expression_(expression),
         arguments_(arguments),
-        bit_field_(IsUninitializedField::encode(false)) {
+        bit_field_(
+            IsUninitializedField::encode(false) |
+            HasSpreadArgumentsField::encode(false)) {
     if (expression->IsProperty()) {
       expression->AsProperty()->mark_for_call();
     }
@@ -1917,6 +1931,7 @@ class Call FINAL : public Expression {
   Handle<Cell> cell_;
   Handle<AllocationSite> allocation_site_;
   class IsUninitializedField : public BitField8<bool, 0, 1> {};
+  class HasSpreadArgumentsField : public BitField8<bool, 1, 1> {};
   uint8_t bit_field_;
 };
 
@@ -2243,6 +2258,35 @@ class CompareOperation FINAL : public Expression {
 };
 
 
+class SpreadOperation FINAL : public Expression {
+ public:
+  DECLARE_NODE_TYPE(SpreadOperation)
+
+  Expression* expression() const { return expression_; }
+  Expression* assign_iterator() const { return assign_iterator_; }
+  Expression* next_result() const { return next_result_; }
+  Expression* result_done() const { return result_done_; }
+  Expression* result_value() const { return result_value_; }
+
+  static int num_ids() { return parent_num_ids(); }
+
+ protected:
+  SpreadOperation(Zone* zone, AstNodeFactory* factory,
+                  AstValueFactory* value_factory, Scope* scope,
+                  Expression* expression, int pos);
+  static int parent_num_ids() { return Expression::num_ids(); }
+
+ private:
+  int local_id(int n) const { return base_id() + parent_num_ids() + n; }
+
+  Expression* expression_;
+  Expression* assign_iterator_;
+  Expression* next_result_;
+  Expression* result_done_;
+  Expression* result_value_;
+};
+
+
 class Conditional FINAL : public Expression {
  public:
   DECLARE_NODE_TYPE(Conditional)
@@ -3463,6 +3507,12 @@ class AstNodeFactory FINAL BASE_EMBEDDED {
     return new (zone_) CompareOperation(zone_, op, left, right, pos);
   }
 
+  SpreadOperation* NewSpreadOperation(Scope* scope, Expression* expression,
+                                      int pos) {
+    return new (zone_) SpreadOperation(zone_, this, ast_value_factory_, scope,
+                                       expression, pos);
+  }
+
   Conditional* NewConditional(Expression* condition,
                               Expression* then_expression,
                               Expression* else_expression,
@@ -3538,6 +3588,16 @@ class AstNodeFactory FINAL BASE_EMBEDDED {
     return new (zone_) SuperReference(zone_, this_var, pos);
   }
 
+  // Utilities
+  Expression* GetIterator(Expression* iterable) {
+    Expression* iterator_symbol_literal =
+        NewSymbolLiteral("iterator_symbol", RelocInfo::kNoPosition);
+    int pos = iterable->position();
+    Expression* prop = NewProperty(iterable, iterator_symbol_literal, pos);
+    ZoneList<Expression*>* args = new (zone_) ZoneList<Expression*>(0, zone_);
+    return NewCall(prop, args, pos);
+  }
+
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;