feat: implement objects and classes

include/common/fzl_opcodes.h

@@ -21,6 +21,10 @@ typedef enum
   FZL_OPCODE_CALL = 0xF30001, // Call function
   FZL_OPCODE_RET  = 0xF30002, // Return from function
 
+  FZL_OPCODE_ALLOC_OBJECT = 0xFA0001, // Allocate N slots
+  FZL_OPCODE_GET_FIELD    = 0xFA0002, // Get field N of an object at dstack
+  FZL_OPCODE_SET_FIELD    = 0xFA0003, // Set field N of an object at dstack
+
   FZL_OPCODE_ADD = 0xA00001, // Sum two numbers in dstack
   FZL_OPCODE_SUB = 0xA00002, // Subract two numbers in dstack
   FZL_OPCODE_MUL = 0xA00003, // Multiply two numbers in dstack

include/common/fzl_types.h

@@ -4,6 +4,7 @@
 typedef enum
 {
   FZL_TYPE_NULL,
+  FZL_TYPE_OBJECT,
 
   FZL_TYPE_STRING,
   FZL_TYPE_CHAR,

include/common/fzl_value.h

@@ -13,6 +13,8 @@ typedef struct
 
   union
   {
+    void *obj;
+
     struct
     {
       const char *value;