[es6] implement destructuring assignment

src/ast/ast-numbering.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ast/ast-numbering.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 
 namespace v8 {
@@ skipping 330 matching lines @@
 
 void AstNumberingVisitor::VisitProperty(Property* node) {
   VisitPropertyReference(node);
   ReserveFeedbackSlots(node);
 }
 
 
 void AstNumberingVisitor::VisitAssignment(Assignment* node) {
   IncrementNodeCount();
   node->set_base_id(ReserveIdRange(Assignment::num_ids()));
+
   if (node->is_compound()) VisitBinaryOperation(node->binary_operation());
   VisitReference(node->target());
   Visit(node->value());
   ReserveFeedbackSlots(node);
 }
 
 
 void AstNumberingVisitor::VisitBinaryOperation(BinaryOperation* node) {
   IncrementNodeCount();
   node->set_base_id(ReserveIdRange(BinaryOperation::num_ids()));
@@ skipping 188 matching lines @@
 
 
 void AstNumberingVisitor::VisitFunctionLiteral(FunctionLiteral* node) {
   IncrementNodeCount();
   node->set_base_id(ReserveIdRange(FunctionLiteral::num_ids()));
   // We don't recurse into the declarations or body of the function literal:
   // you have to separately Renumber() each FunctionLiteral that you compile.
 }
 
 
+void AstNumberingVisitor::VisitRewritableAssignmentExpression(
+    RewritableAssignmentExpression* node) {
+  IncrementNodeCount();
+  node->set_base_id(ReserveIdRange(RewritableAssignmentExpression::num_ids()));
+  Visit(node->expression());
+}
+
+
 bool AstNumberingVisitor::Finish(FunctionLiteral* node) {
   node->set_ast_properties(&properties_);
   node->set_dont_optimize_reason(dont_optimize_reason());
   return !HasStackOverflow();
 }
 
 
 bool AstNumberingVisitor::Renumber(FunctionLiteral* node) {
   Scope* scope = node->scope();
 
@@ skipping 14 matching lines @@
 }
 
 
 bool AstNumbering::Renumber(Isolate* isolate, Zone* zone,
                             FunctionLiteral* function) {
   AstNumberingVisitor visitor(isolate, zone);
   return visitor.Renumber(function);
 }
 }  // namespace internal
 }  // namespace v8