Make compilation VM tags more fine grained

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 7836 matching lines @@
 
 
 void Script::Tokenize(const String& private_key) const {
   Isolate* isolate = Isolate::Current();
   const TokenStream& tkns = TokenStream::Handle(isolate, tokens());
   if (!tkns.IsNull()) {
     // Already tokenized.
     return;
   }
   // Get the source, scan and allocate the token stream.
-  VMTagScope tagScope(isolate, VMTag::kCompileTagId);

[Ivan Posva, 2014/05/21 18:01:32]

Why not set the scanner tag here? Creating the TokenStream object should be part
of it.

   TimerScope timer(FLAG_compiler_stats, &CompilerStats::scanner_timer);
   const String& src = String::Handle(isolate, Source());
   Scanner scanner(src, private_key);
   set_tokens(TokenStream::Handle(isolate,
                                  TokenStream::New(scanner.GetStream(),
                                                   private_key)));
   if (FLAG_compiler_stats) {
     CompilerStats::src_length += src.Length();
   }
 }
@@ skipping 10986 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart