Initialize class/struct variables with default values in core/ and drivers/

core/templates/hash_map.h

@@ -73,7 +73,7 @@ public:
 	private:
 		friend class HashMap;
 
-		uint32_t hash;
+		uint32_t hash = 0;
 		Element *next = nullptr;
 		Element() {}
 		Pair pair;

core/templates/list.h

@@ -137,9 +137,9 @@ public:
 
 private:
 	struct _Data {
-		Element *first;
-		Element *last;
-		int size_cache;
+		Element *first = nullptr;
+		Element *last = nullptr;
+		int size_cache = 0;
 
 		bool erase(const Element *p_I) {
 			ERR_FAIL_COND_V(!p_I, false);

core/templates/safe_refcount.h

@@ -165,7 +165,7 @@ uint64_t atomic_exchange_if_greater(volatile uint64_t *pw, volatile uint64_t val
 #endif
 
 struct SafeRefCount {
-	uint32_t count;
+	uint32_t count = 0;
 
 public:
 	// destroy() is called when weak_count_ drops to zero.

core/templates/set.h

@@ -80,7 +80,7 @@ public:
 private:
 	struct _Data {
 		Element *_root = nullptr;
-		Element *_nil;
+		Element *_nil = nullptr;
 		int size_cache = 0;
 
 		_FORCE_INLINE_ _Data() {

core/templates/thread_work_pool.h

@@ -41,8 +41,8 @@ class ThreadWorkPool {
 	std::atomic<uint32_t> index;
 
 	struct BaseWork {
-		std::atomic<uint32_t> *index;
-		uint32_t max_elements;
+		std::atomic<uint32_t> *index = nullptr;
+		uint32_t max_elements = 0;
 		virtual void work() = 0;
 		virtual ~BaseWork() = default;
 	};