Remove unused code, improve speed of Parser::CurrentToken (improvement seen in measurements and pro…

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 4935 matching lines @@
 
 
 void Function::ClearCode() const {
   StorePointer(&raw_ptr()->code_, StubCode::LazyCompile_entry()->code());
   StorePointer(&raw_ptr()->unoptimized_code_, Code::null());
 }
 
 
 void Function::SwitchToUnoptimizedCode() const {
   ASSERT(HasOptimizedCode());
-
   const Code& current_code = Code::Handle(CurrentCode());
 
-  // Optimized code object might have been actually fully produced by the
-  // intrinsifier in this case nothing has to be done. In fact an attempt to
-  // patch such code will cause crash.
-  // TODO(vegorov): if intrisifier can fully intrinsify the function then we
-  // should not later try to optimize it.
-  if (PcDescriptors::Handle(current_code.pc_descriptors()).Length() == 0) {
-    return;
-  }
-
   if (FLAG_trace_disabling_optimized_code) {
     OS::Print("Disabling optimized code: '%s' entry: %#" Px "\n",
       ToFullyQualifiedCString(),
       current_code.EntryPoint());
   }
   // Patch entry of the optimized code.
   CodePatcher::PatchEntry(current_code);
   // Use previously compiled unoptimized code.
   AttachCode(Code::Handle(unoptimized_code()));
   CodePatcher::RestoreEntry(Code::Handle(unoptimized_code()));
@@ skipping 13932 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart