We can't allocate more than 64k worth of entries, because 64k-1 is EB_NULL.

api/memory/dynamic.c

@@ -36,11 +36,14 @@
 #include "memory.h"
 
 union eb_memory_item* eb_memory_array = 0;
-static EB_POINTER(eb_memory_item) eb_memory_array_size = 128; /* ie: initally 256 */
+static uint32_t eb_memory_array_size = 128; /* ie: initally 256 */
 
 int eb_expand_array(void) {
   void* new_address;
-  EB_POINTER(eb_memory_item) next_size, i;
+  uint32_t next_size, i;
+  
+  /* When next_size reaches the maximum of 64k entries, fail */
+  if (eb_memory_array_size == 65536) return -1;
   
   /* Doubling ensures constant cost */
   next_size = eb_memory_array_size + eb_memory_array_size;
@@ -58,7 +61,7 @@ int eb_expand_array(void) {
   /* Link together the expanded free list */
   for (i = eb_memory_array_size; i != next_size; ++i)
     eb_memory_array[i].free_item.next = i+1; 
-  
+
   eb_memory_array[next_size-1].free_item.next = EB_END_OF_FREE;
   eb_memory_free = eb_memory_array_size;
   eb_memory_array_size = next_size;