Skip compilation of signature classes.

runtime/vm/compiler.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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 139 matching lines @@
 
 RawError* Compiler::CompileClass(const Class& cls) {
   // If class is a top level class it is already parsed.
   if (cls.IsTopLevel()) {
     return Error::null();
   }
   // If the class is already marked for parsing return immediately.
   if (cls.is_marked_for_parsing()) {
     return Error::null();
   }
+  // If the class is a signature class there is no need to try and
+  // compile it. Just finalize it directly.
+  if (cls.IsSignatureClass()) {
+#if defined(DEBUG)
+    const Type& type = Type::Handle(
+        Isolate::Current()->object_store()->function_impl_type());
+    const Class& type_cls = Class::Handle(type.type_class());
+    ASSERT(type_cls.is_finalized());
+#endif
+    LongJumpScope jump;
+    if (setjmp(*jump.Set()) == 0) {
+      ClassFinalizer::FinalizeClass(cls);
+      return Error::null();
+    } else {
+      Isolate* isolate = Isolate::Current();
+      Error& error = Error::Handle(isolate);
+      error = isolate->object_store()->sticky_error();
+      isolate->object_store()->clear_sticky_error();
+      return error.raw();
+    }
+  }
 
   Isolate* isolate = Isolate::Current();
   // We remember all the classes that are being compiled in these lists. This
   // also allows us to reset the marked_for_parsing state in case we see an
   // error.
   VMTagScope tagScope(isolate, VMTag::kCompileTopLevelTagId);
   Class& parse_class = Class::Handle(isolate);
   const GrowableObjectArray& parse_list =
       GrowableObjectArray::Handle(isolate, GrowableObjectArray::New(4));
   const GrowableObjectArray& patch_list =
@@ skipping 862 matching lines @@
     const Object& result =
       PassiveObject::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart