[heap] Fix cpplint 'runtime/references' warnings

This replaces non-const reference arguments by pointers.

Bug: v8:9429
Change-Id: I5e5d94b020dedf3005f8d74202d31e3a50bdf754
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1690943Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62588}

src/heap/heap.cc

@@ -171,16 +171,15 @@ struct Heap::StrongRootsList {
 
 class IdleScavengeObserver : public AllocationObserver {
  public:
-  IdleScavengeObserver(Heap& heap,  // NOLINT(runtime/references)
-                       intptr_t step_size)
+  IdleScavengeObserver(Heap* heap, intptr_t step_size)
       : AllocationObserver(step_size), heap_(heap) {}
 
   void Step(int bytes_allocated, Address, size_t) override {
-    heap_.ScheduleIdleScavengeIfNeeded(bytes_allocated);
+    heap_->ScheduleIdleScavengeIfNeeded(bytes_allocated);
   }
 
  private:
-  Heap& heap_;
+  Heap* heap_;
 };
 
 Heap::Heap()
@@ -1328,28 +1327,27 @@ intptr_t CompareWords(int size, HeapObject a, HeapObject b) {
   return 0;
 }
 
-void ReportDuplicates(
-    int size, std::vector<HeapObject>& objects) {  // NOLINT(runtime/references)
-  if (objects.size() == 0) return;
+void ReportDuplicates(int size, std::vector<HeapObject>* objects) {
+  if (objects->size() == 0) return;
 
-  sort(objects.begin(), objects.end(), [size](HeapObject a, HeapObject b) {
+  sort(objects->begin(), objects->end(), [size](HeapObject a, HeapObject b) {
     intptr_t c = CompareWords(size, a, b);
     if (c != 0) return c < 0;
     return a < b;
   });
 
   std::vector<std::pair<int, HeapObject>> duplicates;
-  HeapObject current = objects[0];
+  HeapObject current = (*objects)[0];
   int count = 1;
-  for (size_t i = 1; i < objects.size(); i++) {
-    if (CompareWords(size, current, objects[i]) == 0) {
+  for (size_t i = 1; i < objects->size(); i++) {
+    if (CompareWords(size, current, (*objects)[i]) == 0) {
       count++;
     } else {
       if (count > 1) {
         duplicates.push_back(std::make_pair(count - 1, current));
       }
       count = 1;
-      current = objects[i];
+      current = (*objects)[i];
     }
   }
   if (count > 1) {
@@ -1432,7 +1430,7 @@ void Heap::CollectAllAvailableGarbage(GarbageCollectionReason gc_reason) {
     }
     for (auto it = objects_by_size.rbegin(); it != objects_by_size.rend();
          ++it) {
-      ReportDuplicates(it->first, it->second);
+      ReportDuplicates(it->first, &it->second);
     }
   }
 }
@@ -5016,7 +5014,7 @@ void Heap::SetUpSpaces() {
   if (FLAG_idle_time_scavenge) {
     scavenge_job_.reset(new ScavengeJob());
     idle_scavenge_observer_.reset(new IdleScavengeObserver(
-        *this, ScavengeJob::kBytesAllocatedBeforeNextIdleTask));
+        this, ScavengeJob::kBytesAllocatedBeforeNextIdleTask));
     new_space()->AddAllocationObserver(idle_scavenge_observer_.get());
   }
 
@@ -5025,12 +5023,12 @@ void Heap::SetUpSpaces() {
 
   if (FLAG_stress_marking > 0) {
     stress_marking_percentage_ = NextStressMarkingLimit();
-    stress_marking_observer_ = new StressMarkingObserver(*this);
+    stress_marking_observer_ = new StressMarkingObserver(this);
     AddAllocationObserversToAllSpaces(stress_marking_observer_,
                                       stress_marking_observer_);
   }
   if (FLAG_stress_scavenge > 0) {
-    stress_scavenge_observer_ = new StressScavengeObserver(*this);
+    stress_scavenge_observer_ = new StressScavengeObserver(this);
     new_space()->AddAllocationObserver(stress_scavenge_observer_);
   }
 

src/heap/incremental-marking.cc

@@ -37,14 +37,14 @@ using IncrementalMarkingMarkingVisitor =
 
 void IncrementalMarking::Observer::Step(int bytes_allocated, Address addr,
                                         size_t size) {
-  Heap* heap = incremental_marking_.heap();
+  Heap* heap = incremental_marking_->heap();
   VMState<GC> state(heap->isolate());
   RuntimeCallTimerScope runtime_timer(
       heap->isolate(),
       RuntimeCallCounterId::kGC_Custom_IncrementalMarkingObserver);
-  incremental_marking_.AdvanceOnAllocation();
+  incremental_marking_->AdvanceOnAllocation();
   // AdvanceIncrementalMarkingOnAllocation can start incremental marking.
-  incremental_marking_.EnsureBlackAllocated(addr, size);
+  incremental_marking_->EnsureBlackAllocated(addr, size);
 }
 
 IncrementalMarking::IncrementalMarking(
@@ -64,8 +64,8 @@ IncrementalMarking::IncrementalMarking(
       black_allocation_(false),
       finalize_marking_completed_(false),
       request_type_(NONE),
-      new_generation_observer_(*this, kYoungGenerationAllocatedThreshold),
-      old_generation_observer_(*this, kOldGenerationAllocatedThreshold) {
+      new_generation_observer_(this, kYoungGenerationAllocatedThreshold),
+      old_generation_observer_(this, kOldGenerationAllocatedThreshold) {
   DCHECK_NOT_NULL(marking_worklist_);
   SetState(STOPPED);
 }

src/heap/incremental-marking.h

@@ -255,16 +255,14 @@ class V8_EXPORT_PRIVATE IncrementalMarking {
  private:
   class Observer : public AllocationObserver {
    public:
-    Observer(
-        IncrementalMarking& incremental_marking,  // NOLINT(runtime/references)
-        intptr_t step_size)
+    Observer(IncrementalMarking* incremental_marking, intptr_t step_size)
         : AllocationObserver(step_size),
           incremental_marking_(incremental_marking) {}
 
     void Step(int bytes_allocated, Address, size_t) override;
 
    private:
-    IncrementalMarking& incremental_marking_;
+    IncrementalMarking* incremental_marking_;
   };
 
   void StartMarking();

src/heap/stress-marking-observer.cc

@@ -9,14 +9,14 @@ namespace v8 {
 namespace internal {
 
 // TODO(majeski): meaningful step_size
-StressMarkingObserver::StressMarkingObserver(Heap& heap)
+StressMarkingObserver::StressMarkingObserver(Heap* heap)
     : AllocationObserver(64), heap_(heap) {}
 
 void StressMarkingObserver::Step(int bytes_allocated, Address soon_object,
                                  size_t size) {
-  heap_.StartIncrementalMarkingIfAllocationLimitIsReached(Heap::kNoGCFlags,
-                                                          kNoGCCallbackFlags);
-  heap_.incremental_marking()->EnsureBlackAllocated(soon_object, size);
+  heap_->StartIncrementalMarkingIfAllocationLimitIsReached(Heap::kNoGCFlags,
+                                                           kNoGCCallbackFlags);
+  heap_->incremental_marking()->EnsureBlackAllocated(soon_object, size);
 }
 
 }  // namespace internal

src/heap/stress-marking-observer.h

@@ -12,12 +12,12 @@ namespace internal {
 
 class StressMarkingObserver : public AllocationObserver {
  public:
-  explicit StressMarkingObserver(Heap& heap);  // NOLINT(runtime/references)
+  explicit StressMarkingObserver(Heap* heap);
 
   void Step(int bytes_allocated, Address soon_object, size_t size) override;
 
  private:
-  Heap& heap_;
+  Heap* heap_;
 };
 
 }  // namespace internal

src/heap/stress-scavenge-observer.cc

@@ -13,7 +13,7 @@ namespace v8 {
 namespace internal {
 
 // TODO(majeski): meaningful step_size
-StressScavengeObserver::StressScavengeObserver(Heap& heap)
+StressScavengeObserver::StressScavengeObserver(Heap* heap)
     : AllocationObserver(64),
       heap_(heap),
       has_requested_gc_(false),
@@ -21,22 +21,22 @@ StressScavengeObserver::StressScavengeObserver(Heap& heap)
   limit_percentage_ = NextLimit();
 
   if (FLAG_trace_stress_scavenge && !FLAG_fuzzer_gc_analysis) {
-    heap_.isolate()->PrintWithTimestamp(
+    heap_->isolate()->PrintWithTimestamp(
         "[StressScavenge] %d%% is the new limit\n", limit_percentage_);
   }
 }
 
 void StressScavengeObserver::Step(int bytes_allocated, Address soon_object,
                                   size_t size) {
-  if (has_requested_gc_ || heap_.new_space()->Capacity() == 0) {
+  if (has_requested_gc_ || heap_->new_space()->Capacity() == 0) {
     return;
   }
 
   double current_percent =
-      heap_.new_space()->Size() * 100.0 / heap_.new_space()->Capacity();
+      heap_->new_space()->Size() * 100.0 / heap_->new_space()->Capacity();
 
   if (FLAG_trace_stress_scavenge) {
-    heap_.isolate()->PrintWithTimestamp(
+    heap_->isolate()->PrintWithTimestamp(
         "[Scavenge] %.2lf%% of the new space capacity reached\n",
         current_percent);
   }
@@ -49,11 +49,11 @@ void StressScavengeObserver::Step(int bytes_allocated, Address soon_object,
 
   if (static_cast<int>(current_percent) >= limit_percentage_) {
     if (FLAG_trace_stress_scavenge) {
-      heap_.isolate()->PrintWithTimestamp("[Scavenge] GC requested\n");
+      heap_->isolate()->PrintWithTimestamp("[Scavenge] GC requested\n");
     }
 
     has_requested_gc_ = true;
-    heap_.isolate()->stack_guard()->RequestGC();
+    heap_->isolate()->stack_guard()->RequestGC();
   }
 }
 
@@ -63,15 +63,15 @@ bool StressScavengeObserver::HasRequestedGC() const {
 
 void StressScavengeObserver::RequestedGCDone() {
   double current_percent =
-      heap_.new_space()->Size() * 100.0 / heap_.new_space()->Capacity();
+      heap_->new_space()->Size() * 100.0 / heap_->new_space()->Capacity();
   limit_percentage_ = NextLimit(static_cast<int>(current_percent));
 
   if (FLAG_trace_stress_scavenge) {
-    heap_.isolate()->PrintWithTimestamp(
+    heap_->isolate()->PrintWithTimestamp(
         "[Scavenge] %.2lf%% of the new space capacity reached\n",
         current_percent);
-    heap_.isolate()->PrintWithTimestamp("[Scavenge] %d%% is the new limit\n",
-                                        limit_percentage_);
+    heap_->isolate()->PrintWithTimestamp("[Scavenge] %d%% is the new limit\n",
+                                         limit_percentage_);
   }
 
   has_requested_gc_ = false;
@@ -87,7 +87,7 @@ int StressScavengeObserver::NextLimit(int min) {
     return max;
   }
 
-  return min + heap_.isolate()->fuzzer_rng()->NextInt(max - min + 1);
+  return min + heap_->isolate()->fuzzer_rng()->NextInt(max - min + 1);
 }
 
 }  // namespace internal

src/heap/stress-scavenge-observer.h

@@ -12,7 +12,7 @@ namespace internal {
 
 class StressScavengeObserver : public AllocationObserver {
  public:
-  explicit StressScavengeObserver(Heap& heap);  // NOLINT(runtime/references)
+  explicit StressScavengeObserver(Heap* heap);
 
   void Step(int bytes_allocated, Address soon_object, size_t size) override;
 
@@ -24,7 +24,7 @@ class StressScavengeObserver : public AllocationObserver {
   double MaxNewSpaceSizeReached() const;
 
  private:
-  Heap& heap_;
+  Heap* heap_;
   int limit_percentage_;
   bool has_requested_gc_;