wip: working on variables

include/common/fzl_opcodes.h

@@ -8,6 +8,12 @@ typedef enum
   FZL_OPCODE_CALL_BUILTIN = 0xF00002, // Call builtin function
   FZL_OPCODE_PUSHNUM      = 0xF00003, // Push number into stack
 
+  FZL_OPCODE_MK_ENVTABLE = 0xF10001, // Allocate new environment table
+  FZL_OPCODE_RM_ENVTABLE = 0xF10002, // Free environment table
+  FZL_OPCODE_STORE       = 0xF10003, // Push variable to environment table
+  FZL_OPCODE_LOOKUP_ENV  = 0xF10004, // Lookup name in environment table
+  FZL_OPCODE_WRITE       = 0xF10005, // Wirte into variable
+
   FZL_OPCODE_ADD = 0xA00001, // Sum two numbers in arg strack
   FZL_OPCODE_SUB = 0xA00002, // Subract two numbers in arg stack
   FZL_OPCODE_MUL = 0xA00003, // Multiply two numbers in arg stack

include/compiler/fzl_parser.h

@@ -65,6 +65,13 @@ typedef struct fzl_node
     {
       struct fzl_node *operand;
     } unary_op;
+
+    // Variables declaration and initializing
+    struct
+    {
+      fzl_token_t *type;
+      struct fzl_node *identifier;
+    } var;
   };
 } fzl_node_t;