feat: implement objects and classes

include/compiler/fzl_walker.h

@@ -5,10 +5,20 @@
 #include <common/fzl_types.h>
 #include <compiler/fzl_parser.h>
 #include <compiler/utils/fzl_const_pool.h>
+#include <compiler/utils/fzl_ctable.h>
 #include <compiler/utils/fzl_symtable.h>
 #include <stdbool.h>
 #include <stddef.h>
 
+// Type of context
+typedef enum
+{
+  FZL_WALK_CTX_TYPE_GLOBAL,
+  FZL_WALK_CTX_TYPE_FN,
+  FZL_WALK_CTX_TYPE_CLASS,
+  FZL_WALK_CTX_TYPE_ASSIGN
+} fzl_walk_ctx_type_t;
+
 // Internal walk function result
 typedef struct
 {
@@ -16,11 +26,16 @@ typedef struct
 
   char *error_msg;
   bool error;
+
+  char *classname;
 } fzl_walk_res_t;
 
 // Function context descriptor
-typedef struct
+typedef struct fzl_walk_ctx
 {
+  fzl_walk_ctx_type_t type;
+  struct fzl_walk_ctx *parent;
+
   fzl_node_t *fn;
   size_t initial_env_lvl;
 } fzl_walk_ctx_t;
@@ -39,6 +54,9 @@ typedef struct
   size_t sym_top;
 
   fzl_walk_ctx_t *ctx;
+
+  fzl_ctable_t *classes[64];
+  size_t classes_count;
 } fzl_walker_t;
 
 // Allocate new walker