[es6] implement destructuring assignment

src/ast/prettyprinter.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/prettyprinter.h"
 
 #include <stdarg.h>
 
 #include "src/ast/ast-value-factory.h"
 #include "src/ast/scopes.h"
 #include "src/base/platform/platform.h"
 
 namespace v8 {
 namespace internal {
 
+#define RETURN_IF_FIND_NODE(node) \
+  do {                            \
+    AstNode* tmp = node;          \
+    if (tmp != nullptr) {         \
+      Find(tmp);                  \
+      return;                     \
+    }                             \
+  } while (false)
+
 CallPrinter::CallPrinter(Isolate* isolate) {
   output_ = NULL;
   size_ = 0;
   pos_ = 0;
   position_ = 0;
   found_ = false;
   done_ = false;
   InitializeAstVisitor(isolate);
 }
 
@@ skipping 364 matching lines @@
 
 
 void CallPrinter::VisitSuperPropertyReference(SuperPropertyReference* node) {}
 
 
 void CallPrinter::VisitSuperCallReference(SuperCallReference* node) {
   Print("super");
 }
 
 
+void CallPrinter::VisitRewritableExpression(RewritableExpression* node) {
+  Find(node->expression());
+}
+
+
 void CallPrinter::FindStatements(ZoneList<Statement*>* statements) {
   if (statements == NULL) return;
   for (int i = 0; i < statements->length(); i++) {
     Find(statements->at(i));
   }
 }
 
 
 void CallPrinter::FindArguments(ZoneList<Expression*>* arguments) {
   if (found_) return;
@@ skipping 491 matching lines @@
 void PrettyPrinter::VisitSuperPropertyReference(SuperPropertyReference* node) {
   Print("<super-property-reference>");
 }
 
 
 void PrettyPrinter::VisitSuperCallReference(SuperCallReference* node) {
   Print("<super-call-reference>");
 }
 
 
+void PrettyPrinter::VisitRewritableExpression(RewritableExpression* node) {
+  Visit(node->expression());
+}
+
+
 const char* PrettyPrinter::Print(AstNode* node) {
   Init();
   Visit(node);
   return output_;
 }
 
 
 const char* PrettyPrinter::PrintExpression(FunctionLiteral* program) {
   Init();
   ExpressionStatement* statement =
@@ skipping 731 matching lines @@
 void AstPrinter::VisitSuperPropertyReference(SuperPropertyReference* node) {
   IndentedScope indent(this, "SUPER-PROPERTY-REFERENCE", node->position());
 }
 
 
 void AstPrinter::VisitSuperCallReference(SuperCallReference* node) {
   IndentedScope indent(this, "SUPER-CALL-REFERENCE", node->position());
 }
 
 
+void AstPrinter::VisitRewritableExpression(RewritableExpression* node) {
+  Visit(node->expression());
+}
+
+
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8