Reduce the memory footprint of expression classifiers

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index fdb65ff277aa5b5cec753759098a8c27fcfcc726..b31c34c378c8bb6528f0d088e9b64f3f7c29b1f2 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -3024,7 +3024,7 @@ class Parser::DontCollectExpressionsInTailPositionScope {
 class Parser::CollectExpressionsInTailPositionToListScope {
  public:
   CollectExpressionsInTailPositionToListScope(
-      Parser::FunctionState* function_state, List<Expression*>* list)
+      Parser::FunctionState* function_state, ZoneList<Expression*>* list)
       : function_state_(function_state), list_(list) {
     function_state->expressions_in_tail_position().Swap(list_);
   }
@@ -3034,7 +3034,7 @@ class Parser::CollectExpressionsInTailPositionToListScope {
 
  private:
   Parser::FunctionState* function_state_;
-  List<Expression*>* list_;
+  ZoneList<Expression*>* list_;
 };
 
 TryStatement* Parser::ParseTryStatement(bool* ok) {
@@ -3068,7 +3068,7 @@ TryStatement* Parser::ParseTryStatement(bool* ok) {
   Scope* catch_scope = NULL;
   Variable* catch_variable = NULL;
   Block* catch_block = NULL;
-  List<Expression*> expressions_in_tail_position_in_catch_block;
+  ZoneList<Expression*> expressions_in_tail_position_in_catch_block(0, zone());
   if (tok == Token::CATCH) {
     Consume(Token::CATCH);
 
@@ -3174,7 +3174,7 @@ TryStatement* Parser::ParseTryStatement(bool* ok) {
     // For a try-catch construct append return expressions from the catch block
     // to the list of return expressions.
     function_state_->expressions_in_tail_position().AddAll(
-        expressions_in_tail_position_in_catch_block);
+        expressions_in_tail_position_in_catch_block, zone());
 
     DCHECK(finally_block == NULL);
     DCHECK(catch_scope != NULL && catch_variable != NULL);
@@ -4801,7 +4801,7 @@ ZoneList<Statement*>* Parser::ParseEagerFunctionBody(
 
   // ES6 14.6.1 Static Semantics: IsInTailPosition
   // Mark collected return expressions that are in tail call position.
-  const List<Expression*>& expressions_in_tail_position =
+  const ZoneList<Expression*>& expressions_in_tail_position =
       function_state_->expressions_in_tail_position();
   for (int i = 0; i < expressions_in_tail_position.length(); ++i) {
     expressions_in_tail_position[i]->MarkTail();
@@ -5541,6 +5541,12 @@ void ParserTraits::RewriteNonPattern(Type::ExpressionClassifier* classifier,
 }
 
 
+ZoneList<typename ParserTraits::Type::ExpressionClassifier::Error>*
+ParserTraits::GetReportedErrorList() const {
+  return parser_->function_state_->GetReportedErrorList();
+}
+
+
 Zone* ParserTraits::zone() const {
   return parser_->function_state_->scope()->zone();
 }