Print messages when aborting background compilation (--trace-compiler); turn on background compilat…

runtime/vm/flow_graph_inliner.cc

 // Copyright (c) 2013, 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/flow_graph_inliner.h"
 
 #include "vm/aot_optimizer.h"
 #include "vm/block_scheduler.h"
 #include "vm/branch_optimizer.h"
 #include "vm/compiler.h"
@@ skipping 714 matching lines @@
           CSTAT_TIMER_SCOPE(thread(), graphinliner_parse_timer);
           parsed_function = GetParsedFunction(function, &in_cache);
         }
 
         if (Compiler::IsBackgroundCompilation()) {
           if (isolate->IsTopLevelParsing() ||
                   (loading_invalidation_gen_at_start !=
                    isolate->loading_invalidation_gen())) {
             // Loading occured while parsing. We need to abort here because
             // state changed while compiling.
-            Compiler::AbortBackgroundCompilation(Thread::kNoDeoptId);
+            Compiler::AbortBackgroundCompilation(Thread::kNoDeoptId,
+                "Loading occured while parsing in inliner");
           }
         }
 
         // Load IC data for the callee.
         ZoneGrowableArray<const ICData*>* ic_data_array =
               new(Z) ZoneGrowableArray<const ICData*>();
         const bool clone_ic_data = Compiler::IsBackgroundCompilation();
         function.RestoreICDataMap(ic_data_array, clone_ic_data);
         if (Compiler::IsBackgroundCompilation() &&
             (function.ic_data_array() == Array::null())) {
-          Compiler::AbortBackgroundCompilation(Thread::kNoDeoptId);
+          Compiler::AbortBackgroundCompilation(Thread::kNoDeoptId,
+              "ICData cleared while inlining");
         }
 
         // Build the callee graph.
         InlineExitCollector* exit_collector =
             new(Z) InlineExitCollector(caller_graph_, call);
         FlowGraphBuilder builder(*parsed_function,
                                  *ic_data_array,
                                  exit_collector,
                                  Compiler::kNoOSRDeoptId);
         builder.SetInitialBlockId(caller_graph_->max_block_id());
@@ skipping 2352 matching lines @@
       return InlineDoubleOp(flow_graph, Token::kMUL, call, entry, last);
     case MethodRecognizer::kDoubleDiv:
       return InlineDoubleOp(flow_graph, Token::kDIV, call, entry, last);
     default:
       return false;
   }
 }
 
 
 }  // namespace dart