763   { GCTracer tracer(this, gc_reason, collector_reason);  in CollectGarbage()  local
769     tracer.set_gc_count(gc_count_);  in CollectGarbage()
772     tracer.set_collector(collector);  in CollectGarbage()
779           PerformGarbageCollection(collector, &tracer);  in CollectGarbage()
810   GCTracer tracer(this, NULL, NULL);  in PerformScavenge()  local
812     PerformGarbageCollection(SCAVENGER, &tracer);  in PerformScavenge()
814     PerformGarbageCollection(MARK_COMPACTOR, &tracer);  in PerformScavenge()
1007                                     GCTracer* tracer) {  in PerformGarbageCollection()  argument
1024     GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL);  in PerformGarbageCollection()
1043     MarkCompact(tracer);  in PerformGarbageCollection()
1055     tracer_ = tracer;  in PerformGarbageCollection()
1113     GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL);  in PerformGarbageCollection()
1116             collector, tracer);  in PerformGarbageCollection()
1132     GCTracer::Scope scope(tracer, GCTracer::Scope::EXTERNAL);  in PerformGarbageCollection()
1183 void Heap::MarkCompact(GCTracer* tracer) {  in MarkCompact()  argument
1187   mark_compact_collector_.Prepare(tracer);  in MarkCompact()
1190   tracer->set_full_gc_count(ms_count_);  in MarkCompact()
2269         heap->tracer()->increment_promoted_objects_size(object_size);  in EvacuateObject()
7314   explicit MarkVisitor(PathTracer* tracer) : tracer_(tracer) {}  in MarkVisitor()  argument
7330   explicit UnmarkVisitor(PathTracer* tracer) : tracer_(tracer) {}  in UnmarkVisitor()  argument
7481   PathTracer tracer(target, PathTracer::FIND_ALL, VISIT_ALL);  in TracePathToObjectFrom()  local
7482   tracer.VisitPointer(&root);  in TracePathToObjectFrom()
7489   PathTracer tracer(target, PathTracer::FIND_ALL, VISIT_ALL);  in TracePathToObject()  local
7490   IterateRoots(&tracer, VISIT_ONLY_STRONG);  in TracePathToObject()
7498   PathTracer tracer(PathTracer::kAnyGlobalObject,  in TracePathToGlobal()  local
7501   IterateRoots(&tracer, VISIT_ONLY_STRONG);  in TracePathToGlobal()