Precompile invoke-field-dispatchers for closures.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 2584 matching lines @@
       offset += kWordSize;
     }
   }
   set_instance_size(RoundedAllocationSize(offset));
   set_next_field_offset(offset);
 }
 
 
 RawFunction* Class::GetInvocationDispatcher(const String& target_name,
                                             const Array& args_desc,
-                                            RawFunction::Kind kind) const {
+                                            RawFunction::Kind kind,
+                                            bool create_if_absent) const {
   enum {
     kNameIndex = 0,
     kArgsDescIndex,
     kFunctionIndex,
     kEntrySize
   };
 
   ASSERT(kind == RawFunction::kNoSuchMethodDispatcher ||
          kind == RawFunction::kInvokeFieldDispatcher);
   Function& dispatcher = Function::Handle();
   Array& cache = Array::Handle(invocation_dispatcher_cache());
   ASSERT(!cache.IsNull());
   String& name = String::Handle();
   Array& desc = Array::Handle();
   intptr_t i = 0;
   for (; i < cache.Length(); i += kEntrySize) {
     name ^= cache.At(i + kNameIndex);
     if (name.IsNull()) break;  // Reached last entry.
     if (!name.Equals(target_name)) continue;
     desc ^= cache.At(i + kArgsDescIndex);
     if (desc.raw() != args_desc.raw()) continue;
     dispatcher ^= cache.At(i + kFunctionIndex);
     if (dispatcher.kind() == kind) {
       // Found match.
       ASSERT(dispatcher.IsFunction());
       break;
     }
   }
 
-  if (dispatcher.IsNull()) {
+  if (dispatcher.IsNull() && create_if_absent) {
     if (i == cache.Length()) {
       // Allocate new larger cache.
       intptr_t new_len = (cache.Length() == 0)
           ? static_cast<intptr_t>(kEntrySize)
           : cache.Length() * 2;
       cache ^= Array::Grow(cache, new_len);
       set_invocation_dispatcher_cache(cache);
     }
     dispatcher ^= CreateInvocationDispatcher(target_name, args_desc, kind);
     cache.SetAt(i + kNameIndex, target_name);
@@ skipping 18756 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart