- Mark huge methods are not-optimizable.

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/bigint_operations.h"
@@ skipping 22 matching lines @@
 #include "vm/timer.h"
 #include "vm/unicode.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, show_internal_names, false,
     "Show names of internal classes (e.g. \"OneByteString\") in error messages "
     "instead of showing the corresponding interface names (e.g. \"String\")");
 DEFINE_FLAG(bool, trace_disabling_optimized_code, false,
     "Trace disabling optimized code.");
+DEFINE_FLAG(int, huge_method_cutoff, 20000,
+            "Huge method cutoff: Disables optimizations for huge methods.");
 DECLARE_FLAG(bool, trace_compiler);
 DECLARE_FLAG(bool, eliminate_type_checks);
 DECLARE_FLAG(bool, enable_type_checks);
 
 static const char* kGetterPrefix = "get:";
 static const intptr_t kGetterPrefixLength = strlen(kGetterPrefix);
 static const char* kSetterPrefix = "set:";
 static const intptr_t kSetterPrefixLength = strlen(kSetterPrefix);
 
 cpp_vtable Object::handle_vtable_ = 0;
@@ skipping 3396 matching lines @@
   ASSERT(num_optional_parameters >= 0);
   set_num_optional_parameters(are_optional_positional ?
                               num_optional_parameters :
                               -num_optional_parameters);
 }
 
 
 bool Function::is_optimizable() const {
   return OptimizableBit::decode(raw_ptr()->kind_tag_) &&
          (script() != Script::null()) &&
-         !is_native();
+         !is_native() &&
+         ((end_token_pos() - token_pos()) < FLAG_huge_method_cutoff);
 }
 
 
 void Function::set_is_optimizable(bool value) const {
   set_kind_tag(OptimizableBit::update(value, raw_ptr()->kind_tag_));
 }
 
 
 void Function::set_has_finally(bool value) const {
   set_kind_tag(HasFinallyBit::update(value, raw_ptr()->kind_tag_));
@@ skipping 8959 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart