implemented realloc as well as a bunch of fixes and some small changes like changing the order of arguments for !, making alloc drop etc.

tests/alloc.sl

@@ -3,7 +3,7 @@ import ../stdlib/io.sl
 import ../stdlib/mem.sl
 
 word test-mem-alloc
-    4096 alloc dup 1337 swap !   # allocate 4096 bytes, store 1337 at start
+    4096 alloc dup 1337 !   # allocate 4096 bytes, store 1337 at start
     dup @ puti cr                # print value at start
     4096 free                    # free the memory
 end
@@ -16,9 +16,9 @@ end
 word main
     32 alloc           # allocate 32 bytes (enough for a Point struct)
     dup
-    dup 111 swap Point.x!
-    dup 222 swap Point.y!
-    dup Point.x@ puti cr
-    Point.y@ puti cr
+    dup 111 Point.x!     # store 111 at offset 0 (Point.x)
+    dup 222 Point.y! # store 222 at offset 8 (Point.y)
+    dup Point.x@ puti cr      # print x
+    dup Point.y@ puti cr  # print y
     32 free            # free the memory
 end

tests/integration_core.sl

@@ -66,7 +66,7 @@ end
 
 word test-store
     mem-slot dup
-    123 swap !
+    123 !
     @ puti cr
 end
 
@@ -80,7 +80,7 @@ word test-mmap
     0      # offset
     mmap
     dup
-    1337 swap !
+    1337 !
     dup
     @ puti cr
     4096 munmap drop
@@ -132,10 +132,10 @@ end
 
 word test-struct
     mem-slot
-    dup 111 swap Point.x!
-    dup 222 swap Point.y!
-    dup Point.x@ puti cr
-    Point.y@ puti cr
+    dup 111 !       # Point.x = 111
+    dup 8 + 222 !   # Point.y = 222
+    dup @ puti cr        # print Point.x
+    dup 8 + @ puti cr    # print Point.y
     Point.size puti cr
 end
 

tests/mem.expected

@@ -1,2 +1,9 @@
 5
-6
+6
+aaaaaaaaaa
+111
+222
+111
+222
+333
+444

tests/mem.sl

@@ -1,9 +1,39 @@
 import ../stdlib/stdlib.sl
-import ../stdlib/io.sl
 
 word main
-    mem 5 swap !
-    mem 8 + 6 swap !
+    mem 5 !
+    mem 8 + 6 !
     mem @ puti cr
     mem 8 + @ puti cr
+
+    10 alloc
+    dup
+    10 97 memset
+    10 2dup puts
+    free
+
+
+    # Test realloc: allocate 16 bytes, fill with data, then grow to 32 bytes
+    16 alloc
+    dup 111 !       # Store 111 at offset 0
+    dup 8 + 222 !   # Store 222 at offset 8
+
+    # Realloc to 32 bytes
+    16 32 realloc  # ( addr old_len=16 new_len=32 ) -> ( new_addr )
+
+    # Verify old data is preserved
+    dup @ puti cr         # Should print 111
+    dup 8 + @ puti cr     # Should print 222
+
+    # Write new data to the expanded region
+    dup 16 + 333 !        # Store 333 at offset 16
+    dup 24 + 444 !        # Store 444 at offset 24
+
+    # Print all values to verify
+    dup @ puti cr         # 111
+    dup 8 + @ puti cr     # 222
+    dup 16 + @ puti cr    # 333
+    dup 24 + @ puti cr    # 444
+
+    32 free
 end