[heap] Pass object as argument to Heap::EnsureSweepingCompleted()

Prepare method by taking an object as argument. In the future we can
optimize this method by only sweeping the object's page.

Bug: v8:11837
Change-Id: Ife1ee7949bfaf590dcc305cc4d03aa1813c07b76
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2940888Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74963}

src/heap/heap.cc

@@ -2266,8 +2266,10 @@ void Heap::CompleteSweepingYoung(GarbageCollector collector) {
   array_buffer_sweeper()->EnsureFinished();
 }
 
-void Heap::EnsureSweepingCompleted() {
+void Heap::EnsureSweepingCompleted(Handle<HeapObject> object) {
+  // TODO(dinfuehr): Only sweep that object's page instead of whole heap.
   mark_compact_collector()->EnsureSweepingCompleted();
+  USE(object);
 }
 
 void Heap::UpdateCurrentEpoch(GarbageCollector collector) {

src/heap/heap.h

@@ -1116,7 +1116,8 @@ class Heap {
   void CompleteSweepingFull();
   void CompleteSweepingYoung(GarbageCollector collector);
 
-  void EnsureSweepingCompleted();
+  // Ensures that sweeping is finished for that object's page.
+  void EnsureSweepingCompleted(Handle<HeapObject> object);
 
   IncrementalMarking* incremental_marking() const {
     return incremental_marking_.get();

src/json/json-parser.cc

@@ -626,7 +626,7 @@ Handle<Object> JsonParser<Char>::BuildJsonObject(
       // must ensure that the sweeper is not running or has already swept the
       // object's page. Otherwise the GC can add the contents of
       // mutable_double_buffer to the free list.
-      isolate()->heap()->EnsureSweepingCompleted();
+      isolate()->heap()->EnsureSweepingCompleted(mutable_double_buffer);
       mutable_double_buffer->set_length(0);
     }
   }