Reuse constructor closures

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 12847 matching lines @@
   }
   const Instance& instance = Instance::Cast(result);
   return new(Z) LiteralNode(symbol_pos,
                             Instance::ZoneHandle(Z, instance.raw()));
 }
 
 
 RawFunction* Parser::BuildConstructorClosureFunction(const Function& ctr,
                                                      intptr_t token_pos) {
   ASSERT(ctr.kind() == RawFunction::kConstructor);
+  Function& closure = Function::Handle(Z);
+  closure = current_class().LookupClosureFunction(token_pos);
+  if (!closure.IsNull()) {
+    ASSERT(closure.IsConstructorClosureFunction());
+    return closure.raw();
+  }
+
   String& closure_name = String::Handle(Z, ctr.name());
   closure_name = Symbols::FromConcat(Symbols::ConstructorClosurePrefix(),
                                      closure_name);
+
   ParamList params;
   params.AddFinalParameter(token_pos,
                            &Symbols::ClosureParameter(),
                            &Type::ZoneHandle(Z, Type::DynamicType()));
 
   ParseFormalParameters(ctr, &params);
   // Per language spec, the type of the closure parameters is dynamic.
   // Replace the types parsed from the constructor.
   params.EraseParameterTypes();
 
-  Function& closure = Function::Handle(Z);
   closure = Function::NewClosureFunction(closure_name,
                                          innermost_function(),
                                          token_pos);
   closure.set_is_generated_body(true);
+  closure.set_is_debuggable(false);
   closure.set_result_type(AbstractType::Handle(Type::DynamicType()));
   AddFormalParamsToFunction(&params, closure);
 
   // Create and set the signature class of the closure.
   const String& sig = String::Handle(Z, closure.Signature());
   Class& sig_cls = Class::Handle(Z, library_.LookupLocalClass(sig));
   if (sig_cls.IsNull()) {
     sig_cls = Class::NewSignatureClass(sig, closure, script_, token_pos);
     library_.AddClass(sig_cls);
   }
@@ skipping 1164 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart