diff --git a/include/coreinit/ipcbufpool.h b/include/coreinit/ipcbufpool.h
index 2b69572af..81b9e0938 100644
--- a/include/coreinit/ipcbufpool.h
+++ b/include/coreinit/ipcbufpool.h
@@ -123,14 +123,15 @@ IPCBufPoolCreate(void *buffer,
                  uint32_t *outNumMessages,
                  uint32_t unk0x0c);
 
-void *
-IPCBufPoolAllocate(IPCBufPool *pool,
-                   uint32_t size);
-
 IOSError
 IPCBufPoolFree(IPCBufPool *pool,
                void *message);
 
+void *
+IPCBufPoolAllocate(IPCBufPool *pool,
+                   uint32_t size)
+   WUT_MALLOC WUT_FREED_BY(IPCBufPoolFree, 2) WUT_ALLOC_SIZE(2);
+
 IOSError
 IPCBufPoolGetAttributes(IPCBufPool *pool,
                         IPCBufPoolAttributes *attribs);
diff --git a/include/coreinit/memblockheap.h b/include/coreinit/memblockheap.h
index d8fb33ef0..455996ed1 100644
--- a/include/coreinit/memblockheap.h
+++ b/include/coreinit/memblockheap.h
@@ -103,19 +103,21 @@ MEMAddBlockHeapTracking(MEMHeapHandle heap,
                         MEMBlockHeapTracking *tracking,
                         uint32_t size);
 
+void
+MEMFreeToBlockHeap(MEMHeapHandle heap,
+                   void *data);
+
 void *
 MEMAllocFromBlockHeapAt(MEMHeapHandle heap,
                         void *addr,
-                        uint32_t size);
+                        uint32_t size)
+   WUT_MALLOC WUT_FREED_BY(MEMFreeToBlockHeap, 2) WUT_ALLOC_SIZE(3);
 
 void *
 MEMAllocFromBlockHeapEx(MEMHeapHandle heap,
                         uint32_t size,
-                        int32_t align);
-
-void
-MEMFreeToBlockHeap(MEMHeapHandle heap,
-                   void *data);
+                        int32_t align)
+   WUT_MALLOC WUT_FREED_BY(MEMFreeToBlockHeap, 2) WUT_ALLOC_SIZE(2) WUT_ALLOC_ALIGN(3);
 
 uint32_t
 MEMGetAllocatableSizeForBlockHeapEx(MEMHeapHandle heap,
diff --git a/include/coreinit/memdefaultheap.h b/include/coreinit/memdefaultheap.h
index cbb087877..5d62ad9b5 100644
--- a/include/coreinit/memdefaultheap.h
+++ b/include/coreinit/memdefaultheap.h
@@ -12,8 +12,8 @@
 extern "C" {
 #endif
 
-typedef void *(*MEMAllocFromDefaultHeapFn)(uint32_t size);
-typedef void *(*MEMAllocFromDefaultHeapExFn)(uint32_t size, int32_t alignment);
+typedef WUT_ALLOC_SIZE(1) void *(*MEMAllocFromDefaultHeapFn)(uint32_t size);
+typedef WUT_ALLOC_SIZE(1) WUT_ALLOC_ALIGN(2) void *(*MEMAllocFromDefaultHeapExFn)(uint32_t size, int32_t alignment);
 typedef void (*MEMFreeToDefaultHeapFn)(void *ptr);
 
 extern MEMAllocFromDefaultHeapFn MEMAllocFromDefaultHeap;
diff --git a/include/coreinit/memexpheap.h b/include/coreinit/memexpheap.h
index a218e4450..1e71f448a 100644
--- a/include/coreinit/memexpheap.h
+++ b/include/coreinit/memexpheap.h
@@ -84,15 +84,16 @@ MEMCreateExpHeapEx(void *heap,
 void *
 MEMDestroyExpHeap(MEMHeapHandle heap);
 
-void *
-MEMAllocFromExpHeapEx(MEMHeapHandle heap,
-                      uint32_t size,
-                      int alignment);
-
 void
 MEMFreeToExpHeap(MEMHeapHandle heap,
                  void *block);
 
+void *
+MEMAllocFromExpHeapEx(MEMHeapHandle heap,
+                      uint32_t size,
+                      int alignment)
+   WUT_MALLOC WUT_FREED_BY(MEMFreeToExpHeap, 2) WUT_ALLOC_ALIGN(3);
+
 MEMExpHeapMode
 MEMSetAllocModeForExpHeap(MEMHeapHandle heap,
                           MEMExpHeapMode mode);
diff --git a/include/coreinit/memfrmheap.h b/include/coreinit/memfrmheap.h
index ee816d94e..2d749dcaa 100644
--- a/include/coreinit/memfrmheap.h
+++ b/include/coreinit/memfrmheap.h
@@ -56,15 +56,16 @@ MEMCreateFrmHeapEx(void *heap,
 void *
 MEMDestroyFrmHeap(MEMHeapHandle heap);
 
-void *
-MEMAllocFromFrmHeapEx(MEMHeapHandle heap,
-                      uint32_t size,
-                      int alignment);
-
 void
 MEMFreeToFrmHeap(MEMHeapHandle heap,
                  MEMFrmHeapFreeMode mode);
 
+void *
+MEMAllocFromFrmHeapEx(MEMHeapHandle heap,
+                      uint32_t size,
+                      int alignment)
+   WUT_MALLOC WUT_ALLOC_SIZE(2) WUT_ALLOC_ALIGN(3);
+
 BOOL
 MEMRecordStateForFrmHeap(MEMHeapHandle heap,
                          uint32_t tag);
diff --git a/include/coreinit/memunitheap.h b/include/coreinit/memunitheap.h
index c1df857bb..c6f3a5c10 100644
--- a/include/coreinit/memunitheap.h
+++ b/include/coreinit/memunitheap.h
@@ -43,13 +43,14 @@ MEMCreateUnitHeapEx(void *heap,
 void *
 MEMDestroyUnitHeap(MEMHeapHandle heap);
 
-void *
-MEMAllocFromUnitHeap(MEMHeapHandle heap);
-
 void
 MEMFreeToUnitHeap(MEMHeapHandle heap,
                   void *block);
 
+void *
+MEMAllocFromUnitHeap(MEMHeapHandle heap)
+   WUT_MALLOC WUT_FREED_BY(MEMFreeToUnitHeap, 2);
+
 void
 MEMiDumpUnitHeap(MEMHeapHandle heap);
 
diff --git a/include/sndcore2/voice.h b/include/sndcore2/voice.h
index bc1e5a94e..105c89863 100644
--- a/include/sndcore2/voice.h
+++ b/include/sndcore2/voice.h
@@ -259,21 +259,24 @@ AXVoiceBegin(AXVoice *v);
 int32_t
 AXVoiceEnd(AXVoice *v);
 
+void
+AXFreeVoice(AXVoice *voice);
+
 AXVoice *
 AXAcquireVoice(uint32_t priority,
                AXVoiceCallbackFn callback,
-               void *userContext);
+               void *userContext)
+   WUT_FREED_BY(AXFreeVoice, 1);
 
 AXVoice *
 AXAcquireVoiceEx(uint32_t priority,
                  AXVoiceCallbackExFn callback,
-                 void *userContext);
+                 void *userContext)
+   WUT_FREED_BY(AXFreeVoice, 1);
 
 BOOL
 AXCheckVoiceOffsets(AXVoiceOffsets *offsets);
 
-void
-AXFreeVoice(AXVoice *voice);
 
 uint32_t
 AXGetMaxVoices();
diff --git a/include/wut.h b/include/wut.h
index c280cc113..554837927 100644
--- a/include/wut.h
+++ b/include/wut.h
@@ -8,14 +8,21 @@
 
 #if defined(__GNUC__) || defined(__clang__)
 
-#define WUT_DEPRECATED(reason)       __attribute__((__deprecated__(reason)))
-#define WUT_FORMAT_PRINTF(fmt, args) __attribute__((__format__(__printf__, fmt, args)))
+#define WUT_DEPRECATED(reason)         __attribute__((__deprecated__(reason)))
+#define WUT_FORMAT_PRINTF(fmt, args)   __attribute__((__format__(__printf__, fmt, args)))
+#define WUT_MALLOC                     __attribute__((malloc))
+#define WUT_FREED_BY(freeFn, ptrIndex) __attribute__((malloc(freeFn, ptrIndex)))
+#define WUT_ALLOC_SIZE(posIndex)       __attribute__((alloc_size(posIndex)))
+#define WUT_ALLOC_ALIGN(posIndex)      __attribute__((alloc_align(posIndex)))
 
 #else // not __GNUC__ and not __clang__
 
 #define WUT_DEPRECATED(reason)
 #define WUT_FORMAT_PRINTF(fmt, args)
-
+#define WUT_MALLOC
+#define WUT_FREED_BY(freeFn, ptrIndex)
+#define WUT_ALLOC_SIZE(posIndex)
+#define WUT_ALLOC_ALIGN(posIndex)
 #endif //__GNUC__ or __clang__
 
 #ifdef DEBUG
@@ -24,9 +31,9 @@
 #define WUT_DEBUG_REPORT(fmt, ...)
 #endif
 
+#include "wut_rplwrap.h"
 #include "wut_structsize.h"
 #include "wut_types.h"
-#include "wut_rplwrap.h"
 #ifdef DEBUG
 #include <coreinit/debug.h>
 #endif