Clean up Iterator.

This CL renames the private struct Iterator::Cleanup ->
Iterator::CleanupNode, to better reflect that it's a linked list node,
and extracts duplicated code from its user in IsEmpty() and Run()
methods.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=199175058

include/leveldb/iterator.h

@@ -77,17 +77,25 @@ class LEVELDB_EXPORT Iterator {
   //
   // Note that unlike all of the preceding methods, this method is
   // not abstract and therefore clients should not override it.
-  typedef void (*CleanupFunction)(void* arg1, void* arg2);
+  using CleanupFunction = void (*)(void* arg1, void* arg2);
   void RegisterCleanup(CleanupFunction function, void* arg1, void* arg2);
 
  private:
-  struct Cleanup {
+  // Cleanup functions are stored in a single-linked list.
+  // The list's head node is inlined in the iterator.
+  struct CleanupNode {
+    // The head node is used if the function pointer is not null.
     CleanupFunction function;
     void* arg1;
     void* arg2;
-    Cleanup* next;
+    CleanupNode* next;
+
+    // True if the node is not used. Only head nodes might be unused.
+    bool IsEmpty() const { return function == nullptr; }
+    // Invokes the cleanup function.
+    void Run() { assert(function != nullptr); (*function)(arg1, arg2); }
   };
-  Cleanup cleanup_;
+  CleanupNode cleanup_head_;
 };
 
 // Return an empty iterator (yields nothing).

table/iterator.cc

@@ -7,54 +7,59 @@
 namespace leveldb {
 
 Iterator::Iterator() {
-  cleanup_.function = nullptr;
-  cleanup_.next = nullptr;
+  cleanup_head_.function = nullptr;
+  cleanup_head_.next = nullptr;
 }
 
 Iterator::~Iterator() {
-  if (cleanup_.function != nullptr) {
-    (*cleanup_.function)(cleanup_.arg1, cleanup_.arg2);
-    for (Cleanup* c = cleanup_.next; c != nullptr; ) {
-      (*c->function)(c->arg1, c->arg2);
-      Cleanup* next = c->next;
-      delete c;
-      c = next;
+  if (!cleanup_head_.IsEmpty()) {
+    cleanup_head_.Run();
+    for (CleanupNode* node = cleanup_head_.next; node != nullptr; ) {
+      node->Run();
+      CleanupNode* next_node = node->next;
+      delete node;
+      node = next_node;
     }
   }
 }
 
 void Iterator::RegisterCleanup(CleanupFunction func, void* arg1, void* arg2) {
   assert(func != nullptr);
-  Cleanup* c;
-  if (cleanup_.function == nullptr) {
-    c = &cleanup_;
+  CleanupNode* node;
+  if (cleanup_head_.IsEmpty()) {
+    node = &cleanup_head_;
   } else {
-    c = new Cleanup;
-    c->next = cleanup_.next;
-    cleanup_.next = c;
+    node = new CleanupNode();
+    node->next = cleanup_head_.next;
+    cleanup_head_.next = node;
   }
-  c->function = func;
-  c->arg1 = arg1;
-  c->arg2 = arg2;
+  node->function = func;
+  node->arg1 = arg1;
+  node->arg2 = arg2;
 }
 
 namespace {
+
 class EmptyIterator : public Iterator {
  public:
   EmptyIterator(const Status& s) : status_(s) { }
-  virtual bool Valid() const { return false; }
-  virtual void Seek(const Slice& target) { }
-  virtual void SeekToFirst() { }
-  virtual void SeekToLast() { }
-  virtual void Next() { assert(false); }
-  virtual void Prev() { assert(false); }
-  Slice key() const { assert(false); return Slice(); }
-  Slice value() const { assert(false); return Slice(); }
-  virtual Status status() const { return status_; }
+  ~EmptyIterator() override = default;
+
+  bool Valid() const override { return false; }
+  void Seek(const Slice& target) override { }
+  void SeekToFirst() override { }
+  void SeekToLast() override { }
+  void Next() override { assert(false); }
+  void Prev() override { assert(false); }
+  Slice key() const override { assert(false); return Slice(); }
+  Slice value() const override { assert(false); return Slice(); }
+  Status status() const override { return status_; }
+
  private:
   Status status_;
 };
-}  // namespace
+
+}  // anonymous namespace
 
 Iterator* NewEmptyIterator() {
   return new EmptyIterator(Status::OK());