[debug] refactor code coverage to use enum for mode.

src/feedback-vector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/feedback-vector.h"
 #include "src/code-stubs.h"
 #include "src/feedback-vector-inl.h"
 #include "src/ic/ic-inl.h"
 #include "src/ic/ic-state.h"
 #include "src/objects.h"
@@ skipping 232 matching lines @@
         array->set(index, Smi::kZero, SKIP_WRITE_BARRIER);
         break;
     }
     for (int j = 1; j < entry_size; j++) {
       array->set(index + j, extra_value, SKIP_WRITE_BARRIER);
     }
     i += entry_size;
   }
 
   Handle<FeedbackVector> result = Handle<FeedbackVector>::cast(array);
-  if (isolate->IsCodeCoverageEnabled()) AddToCodeCoverageList(isolate, result);
+  if (!isolate->is_best_effort_code_coverage()) {
+    AddToCodeCoverageList(isolate, result);
+  }
   return result;
 }
 
 // static
 Handle<FeedbackVector> FeedbackVector::Copy(Isolate* isolate,
                                             Handle<FeedbackVector> vector) {
   Handle<FeedbackVector> result;
   result = Handle<FeedbackVector>::cast(
       isolate->factory()->CopyFixedArray(Handle<FixedArray>::cast(vector)));
-  if (isolate->IsCodeCoverageEnabled()) AddToCodeCoverageList(isolate, result);
+  if (!isolate->is_best_effort_code_coverage()) {
+    AddToCodeCoverageList(isolate, result);
+  }
   return result;
 }
 
 // static
 void FeedbackVector::AddToCodeCoverageList(Isolate* isolate,
                                            Handle<FeedbackVector> vector) {
-  DCHECK(isolate->IsCodeCoverageEnabled());
+  DCHECK(!isolate->is_best_effort_code_coverage());
   if (!vector->shared_function_info()->IsSubjectToDebugging()) return;
   Handle<ArrayList> list =
       Handle<ArrayList>::cast(isolate->factory()->code_coverage_list());
   list = ArrayList::Add(list, vector);
   isolate->SetCodeCoverageList(*list);
 }
 
 void FeedbackVector::ClearSlots(JSFunction* host_function) {
   Isolate* isolate = GetIsolate();
 
@@ skipping 806 matching lines @@
     Handle<Tuple2> entry = Handle<Tuple2>::cast(maybe_entry);
     Handle<String> type =
         Handle<String>(String::cast(entry->value1()), isolate);
     int position = Smi::cast(entry->value2())->value();
     PrintF("%d: %s\n", position, type->ToCString().get());
   }
 }
 
 }  // namespace internal
 }  // namespace v8