Avoid numerous type allocations by caching the canonical type of a class, which

runtime/vm/parser.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/ast_transformer.h"
 #include "vm/bootstrap.h"
@@ skipping 11835 matching lines @@
            current_member_->has_static && !current_member_->has_factory;
   }
   ASSERT(!current_function().IsNull());
   return
       current_function().is_static() && !current_function().IsInFactoryScope();
 }
 
 
 const AbstractType* Parser::ReceiverType(const Class& cls) {
   ASSERT(!cls.IsNull());
-  AbstractType& type = AbstractType::ZoneHandle(Z, cls.CanonicalType());
+  Type& type = Type::ZoneHandle(Z, cls.CanonicalType());
   if (!type.IsNull()) {
-    // This requirement is embedded in 'CanonicalType' function.
-    ASSERT((cls.NumTypeArguments() == 0) && !cls.IsSignatureClass());
     return &type;
   }
-
-  const TypeArguments& type_arguments = TypeArguments::Handle(Z,
-      (cls.NumTypeParameters() > 0) ?
-          cls.type_parameters() : TypeArguments::null());
-  type = Type::New(cls, type_arguments, cls.token_pos());
+  if (cls.IsSignatureClass()) {
+    type = cls.SignatureType();
+  } else {
+    const TypeArguments& type_arguments = TypeArguments::Handle(Z,
+        (cls.NumTypeParameters() > 0) ?
+            cls.type_parameters() : TypeArguments::null());
+    type = Type::New(cls, type_arguments, cls.token_pos());
+  }
   if (cls.is_type_finalized()) {
     type ^= ClassFinalizer::FinalizeType(
         cls, type, ClassFinalizer::kCanonicalizeWellFormed);
     // Note that the receiver type may now be a malbounded type.
+    cls.SetCanonicalType(type);
   }
   return &type;
 }
 
 
 bool Parser::IsInstantiatorRequired() const {
   ASSERT(!current_function().IsNull());
   if (current_function().is_static() &&
       !current_function().IsInFactoryScope()) {
     return false;
@@ skipping 2304 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart