Refine basic block allocation for __syscall

Author: DrXiao

src/parser.c

@@ -5191,13 +5191,14 @@ void parse_internal(void)
     func->return_def.type = TY_int;
     func->num_params = 0;
     func->va_args = 1;
-    if (!dynlink) {
+    /* In dynlink mode. __syscall won't be implemented but needs to exist
+     * for parsing the built-in libc. It will be treated as external.
+     * 
+     * Otherwise, allocate a basic block to implement __syscall in static mode.
+     * */
+    func->bbs = NULL;
+    if (!dynlink)
         func->bbs = arena_calloc(BB_ARENA, 1, sizeof(basic_block_t));
-    } else {
-        /* In dynlink mode. __syscall won't be implemented but needs to exist
-         * for parsing the built-in libc. It will be treated as external */
-        func->bbs = NULL;
-    }
 
     /* lexer initialization */
     SOURCE->size = 0;