added memory manipulation constructs

app/Compiler.hs

@@ -99,6 +99,25 @@ handleSymbol h (ZorthASTWord "dup") = do
              \    push rax\n"
     return ()
 
+
+handleSymbol h (ZorthASTWord "mem") = do
+    liftIO $ hPutStr h 
+             "    push mem\n"
+    return ()
+
+handleSymbol h (ZorthASTWord "!") = do
+    liftIO $ hPutStr h
+             "    pop rbx\n\
+             \    pop rax\n\
+             \    mov qword[rax], rbx\n"
+    return ()
+
+handleSymbol h (ZorthASTWord "@") = do
+    liftIO $ hPutStr h
+             "    pop  rax\n\
+             \    push qword[rax]\n"
+    return ()
+
 handleSymbol h (ZorthASTWord "rot") = do
     liftIO $ hPutStr h 
              "    pop rax\n\
@@ -221,6 +240,8 @@ compileZorth _ [] = return ()
 compileZorth h xs = do
     forthPrelude h
     compileZorthAST h xs $ Environment 0 M.empty
-    hPutStr h  "    mov rax,60\n\
+    hPutStr h "    mov rax,60\n\
-               \    mov rdi,0\n\
+              \    mov rdi,0\n\
-               \    syscall\n"
+              \    syscall\n"
+    hPutStr h "section .bss\n\
+              \    mem: resq 640000\n"