Revert^2 "Update class-table and intern-table concurrently with uffd GC"

This reverts commit 9faffd5c4e062ca45bd6f29a3b6d1b276e6c9839.

Reason for revert: Reland after fixing null-pointer dereference

Bug: 160737021
Test: art/testrunner/testrunner.py
Change-Id: I80d3eda827ea805efc5a0e0eb0b80a9d8ceb9dd5

1 files changed, 26 insertions, 10 deletions

diff --git a/runtime/class_table-inl.h b/runtime/class_table-inl.h
index ecc8a0a620..4ee59a79f7 100644
--- a/runtime/class_table-inl.h
+++ b/runtime/class_table-inl.h
@@ -68,12 +68,14 @@ inline bool ClassTable::ClassDescriptorEquals::operator()(const TableSlot& a,
   return a.Read<kWithoutReadBarrier>()->DescriptorEquals(b.first);
 }
 
-template<class Visitor>
-void ClassTable::VisitRoots(Visitor& visitor) {
+template <class Visitor>
+void ClassTable::VisitRoots(Visitor& visitor, bool skip_classes) {
   ReaderMutexLock mu(Thread::Current(), lock_);
-  for (ClassSet& class_set : classes_) {
-    for (TableSlot& table_slot : class_set) {
-      table_slot.VisitRoot(visitor);
+  if (!skip_classes) {
+    for (ClassSet& class_set : classes_) {
+      for (TableSlot& table_slot : class_set) {
+        table_slot.VisitRoot(visitor);
+      }
     }
   }
   for (GcRoot<mirror::Object>& root : strong_roots_) {
@@ -86,12 +88,14 @@ void ClassTable::VisitRoots(Visitor& visitor) {
   }
 }
 
-template<class Visitor>
-void ClassTable::VisitRoots(const Visitor& visitor) {
+template <class Visitor>
+void ClassTable::VisitRoots(const Visitor& visitor, bool skip_classes) {
   ReaderMutexLock mu(Thread::Current(), lock_);
-  for (ClassSet& class_set : classes_) {
-    for (TableSlot& table_slot : class_set) {
-      table_slot.VisitRoot(visitor);
+  if (!skip_classes) {
+    for (ClassSet& class_set : classes_) {
+      for (TableSlot& table_slot : class_set) {
+        table_slot.VisitRoot(visitor);
+      }
     }
   }
   for (GcRoot<mirror::Object>& root : strong_roots_) {
@@ -104,6 +108,18 @@ void ClassTable::VisitRoots(const Visitor& visitor) {
   }
 }
 
+template <class Condition, class Visitor>
+void ClassTable::VisitClassesIfConditionMet(Condition& cond, Visitor& visitor) {
+  ReaderMutexLock mu(Thread::Current(), lock_);
+  for (ClassSet& class_set : classes_) {
+    if (cond(class_set)) {
+      for (TableSlot& table_slot : class_set) {
+        table_slot.VisitRoot(visitor);
+      }
+    }
+  }
+}
+
 template <typename Visitor>
 class ClassTable::TableSlot::ClassAndRootVisitor {
  public: