[debugger] add precise mode for code coverage.

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 212 matching lines @@
       case FeedbackSlotKind::kKindsNumber:
         UNREACHABLE();
         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;
   }
-  return Handle<FeedbackVector>::cast(array);
+
+  Handle<FeedbackVector> result = Handle<FeedbackVector>::cast(array);
+  if (isolate->IsCodeCoverageEnabled()) 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);
   return result;
 }
 
+// static
+void FeedbackVector::AddToCodeCoverageList(Isolate* isolate,
+                                           Handle<FeedbackVector> vector) {
+  DCHECK(isolate->IsCodeCoverageEnabled());
+  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);
+}
+
 // This logic is copied from
 // StaticMarkingVisitor<StaticVisitor>::VisitCodeTarget.
 static bool ClearLogic(Isolate* isolate) {
   return FLAG_cleanup_code_caches_at_gc && isolate->serializer_enabled();
 }
 
 void FeedbackVector::ClearSlotsImpl(SharedFunctionInfo* shared,
                                     bool force_clear) {
   Isolate* isolate = GetIsolate();
   if (!force_clear && !ClearLogic(isolate)) return;
@@ skipping 741 matching lines @@
 void StoreDataPropertyInLiteralICNexus::ConfigureMonomorphic(
     Handle<Name> name, Handle<Map> receiver_map) {
   Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
 
   SetFeedback(*cell);
   SetFeedbackExtra(*name);
 }
 
 }  // namespace internal
 }  // namespace v8