Move GCC uninitialized memory warning suppression into MaybeInitializedPtr.

PiperOrigin-RevId: 614701769
Change-Id: I7c2143dd467e376eb4936ef894f3413bba681419

absl/container/internal/raw_hash_set.h

@@ -1133,6 +1133,23 @@ struct full_soo_tag_t {};
 // This allows us to work around an uninitialized memory warning when
 // This allows us to work around an uninitialized memory warning when
 // constructing begin() iterators in empty hashtables.
 // constructing begin() iterators in empty hashtables.
 union MaybeInitializedPtr {
 union MaybeInitializedPtr {
+  void* get() const {
+    // Suppress erroneous uninitialized memory errors on GCC. GCC thinks that
+    // the call to slot_array() in find_or_prepare_insert() is reading
+    // uninitialized memory, but slot_array is only called there when the table
+    // is non-empty and this memory is initialized when the table is non-empty.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#pragma GCC diagnostic ignored "-Wuninitialized"
+#endif
+    return p;
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  }
+  void set(void* ptr) { p = ptr; }
+
   void* p;
   void* p;
 };
 };
 
 
@@ -1205,7 +1222,7 @@ class CommonFields : public CommonFieldsGenerationInfo {
   }
   }
 
 
   // Note: we can't use slots() because Qt defines "slots" as a macro.
   // Note: we can't use slots() because Qt defines "slots" as a macro.
-  void* slot_array() const { return heap_or_soo_.heap.slot_array.p; }
+  void* slot_array() const { return heap_or_soo_.heap.slot_array.get(); }
   MaybeInitializedPtr slots_union() const {
   MaybeInitializedPtr slots_union() const {
     // Suppress erroneous uninitialized memory errors on GCC.
     // Suppress erroneous uninitialized memory errors on GCC.
 #if !defined(__clang__) && defined(__GNUC__)
 #if !defined(__clang__) && defined(__GNUC__)
@@ -1217,7 +1234,7 @@ class CommonFields : public CommonFieldsGenerationInfo {
 #pragma GCC diagnostic pop
 #pragma GCC diagnostic pop
 #endif
 #endif
   }
   }
-  void set_slots(void* s) { heap_or_soo_.heap.slot_array.p = s; }
+  void set_slots(void* s) { heap_or_soo_.heap.slot_array.set(s); }
 
 
   // The number of filled slots.
   // The number of filled slots.
   size_t size() const { return size_ >> HasInfozShift(); }
   size_t size() const { return size_ >> HasInfozShift(); }
@@ -1807,7 +1824,7 @@ class HashSetResizeHelper {
   }
   }
   void* old_slots() const {
   void* old_slots() const {
     assert(!was_soo_);
     assert(!was_soo_);
-    return old_heap_or_soo_.heap.slot_array.p;
+    return old_heap_or_soo_.heap.slot_array.get();
   }
   }
   size_t old_capacity() const { return old_capacity_; }
   size_t old_capacity() const { return old_capacity_; }
 
 
@@ -2313,7 +2330,7 @@ class raw_hash_set {
              const GenerationType* generation_ptr)
              const GenerationType* generation_ptr)
         : HashSetIteratorGenerationInfo(generation_ptr),
         : HashSetIteratorGenerationInfo(generation_ptr),
           ctrl_(ctrl),
           ctrl_(ctrl),
-          slot_(to_slot(slot.p)) {
+          slot_(to_slot(slot.get())) {
       // This assumption helps the compiler know that any non-end iterator is
       // This assumption helps the compiler know that any non-end iterator is
       // not equal to any end iterator.
       // not equal to any end iterator.
       ABSL_ASSUME(ctrl != nullptr);
       ABSL_ASSUME(ctrl != nullptr);
@@ -3750,19 +3767,7 @@ class raw_hash_set {
   }
   }
   slot_type* slot_array() const {
   slot_type* slot_array() const {
     assert(!is_soo());
     assert(!is_soo());
-    // Suppress erroneous uninitialized memory errors on GCC. GCC thinks that
-    // the call to slot_array() in find_or_prepare_insert() is reading
-    // uninitialized memory, but slot_array is only called there when the table
-    // is non-empty and this memory is initialized when the table is non-empty.
-#if !defined(__clang__) && defined(__GNUC__)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
-#pragma GCC diagnostic ignored "-Wuninitialized"
-#endif
     return static_cast<slot_type*>(common().slot_array());
     return static_cast<slot_type*>(common().slot_array());
-#if !defined(__clang__) && defined(__GNUC__)
-#pragma GCC diagnostic pop
-#endif
   }
   }
   slot_type* soo_slot() {
   slot_type* soo_slot() {
     assert(is_soo());
     assert(is_soo());