cppgc: Random cleanups

- ObjectAllocator::Terminate() description was out of date.
- Compactor::CancelIfShouldNotCompact() return value was unused.

Change-Id: Ie47e70eaecaba1300ad638e155a9dd273202aca5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3875084Reviewed-by: Omer Katz <omerkatz@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82987}

include/cppgc/internal/gc-info.h

@@ -48,7 +48,6 @@ struct V8_EXPORT EnsureGCInfoIndexTrait final {
   static GCInfoIndex EnsureGCInfoIndexNonPolymorphic(std::atomic<GCInfoIndex>&,
                                                      TraceCallback,
                                                      FinalizationCallback,
-
                                                      NameCallback);
   static GCInfoIndex EnsureGCInfoIndexNonPolymorphic(std::atomic<GCInfoIndex>&,
                                                      TraceCallback,

src/heap/cppgc/compactor.cc

@@ -487,14 +487,13 @@ void Compactor::InitializeIfShouldCompact(
   is_cancelled_ = false;
 }
 
-bool Compactor::CancelIfShouldNotCompact(
+void Compactor::CancelIfShouldNotCompact(
     GarbageCollector::Config::MarkingType marking_type,
     GarbageCollector::Config::StackState stack_state) {
-  if (!is_enabled_ || ShouldCompact(marking_type, stack_state)) return false;
+  if (!is_enabled_ || ShouldCompact(marking_type, stack_state)) return;
 
   is_cancelled_ = true;
   is_enabled_ = false;
-  return true;
 }
 
 Compactor::CompactableSpaceHandling Compactor::CompactSpacesIfEnabled() {

src/heap/cppgc/compactor.h

@@ -25,9 +25,10 @@ class V8_EXPORT_PRIVATE Compactor final {
 
   void InitializeIfShouldCompact(GarbageCollector::Config::MarkingType,
                                  GarbageCollector::Config::StackState);
-  // Returns true is compaction was cancelled.
-  bool CancelIfShouldNotCompact(GarbageCollector::Config::MarkingType,
+  void CancelIfShouldNotCompact(GarbageCollector::Config::MarkingType,
                                 GarbageCollector::Config::StackState);
+  // Returns whether spaces need to be processed by the Sweeper after
+  // compaction.
   CompactableSpaceHandling CompactSpacesIfEnabled();
 
   CompactionWorklists* compaction_worklists() {

src/heap/cppgc/heap-base.cc

@@ -275,7 +275,7 @@ void HeapBase::Terminate() {
         }();
   } while (more_termination_gcs_needed);
 
-  object_allocator().Terminate();
+  object_allocator().ResetLinearAllocationBuffers();
   disallow_gc_scope_++;
 
   CHECK_EQ(0u, strong_persistent_region_.NodesInUse());

src/heap/cppgc/object-allocator.cc

@@ -261,10 +261,6 @@ void ObjectAllocator::ResetLinearAllocationBuffers() {
   visitor.Traverse(raw_heap_);
 }
 
-void ObjectAllocator::Terminate() {
-  ResetLinearAllocationBuffers();
-}
-
 bool ObjectAllocator::in_disallow_gc_scope() const {
   return raw_heap_.heap()->in_disallow_gc_scope();
 }

src/heap/cppgc/object-allocator.h

@@ -53,9 +53,6 @@ class V8_EXPORT_PRIVATE ObjectAllocator final : public cppgc::AllocationHandle {
 
   void ResetLinearAllocationBuffers();
 
-  // Terminate the allocator. Subsequent allocation calls result in a crash.
-  void Terminate();
-
  private:
   bool in_disallow_gc_scope() const;