2 files changed, 10 insertions, 2 deletions
diff --git a/include/program.h b/include/program.h
index 6135726..c097c7b 100644
--- a/include/program.h
+++ b/include/program.h
@@ -3,10 +3,15 @@
 
 #include "std/buffer.h"
 #include "std/hash_map.h"
+#include "value.h"
+
+#define TSL_STACK_MAX_SIZE 255
 
 typedef struct {
     TslBuffer /*TslBytecode*/ function_bytecode_list;
-    TslHashMap variables;
+    TslHashMap /*TslStringView, TslValue*/ variables;
+    TslValue stack_values[TSL_STACK_MAX_SIZE];
+    size_t stack_index;
 } TslProgram;
 
 typedef enum {
diff --git a/include/value.h b/include/value.h
index 1d053b7..58e57fe 100644
--- a/include/value.h
+++ b/include/value.h
@@ -14,6 +14,9 @@ typedef enum {
     TSL_TYPE_USERDATA
 } TslType;
 
+/* TODO: Support BigInt */
+typedef double TslNumber;
+
 typedef enum {
     TSL_FALSE,
     TSL_TRUE
@@ -36,7 +39,7 @@ typedef struct {
 
 typedef struct {
     union {
-        double number;
+        TslNumber number;
         TslString *string;
         TslBool boolean;
         TslList *list;