microscript: add globals

1 files changed, 12 insertions, 1 deletions

diff --git a/uscript/vm.h b/uscript/vm.h
index 15c21a0..2911d01 100644
--- a/uscript/vm.h
+++ b/uscript/vm.h
@@ -11,6 +11,8 @@
 #define vm_peek()  (vm.stacktop[-1])
 #define vm_push(v) (*vm.stacktop++ = (v))
 
+#define set_global(idx, v) (vm.gstack[idx].val = (v))
+
 enum bytecode {
 #define BC(name) BC_##name,
 #include "xbytecode.h"
@@ -22,16 +24,23 @@ struct call_frame {
         struct us_val *stackbot;
 };
 
+struct global {
+        struct us_str *name;
+        struct us_val val;
+};
+
 struct vm {
         struct us_val *objs;
 
         struct call_frame cf_stack[MAX_CALL_FRAMES];
         struct call_frame *cf;
 
-        struct us_val *global_stack; // dyn_arr
         struct us_val stack[STACK_SIZE];
         struct us_val *stacktop;
 
+        struct global *gstack; // dynarr
+        struct global *gstacktop;
+
         struct us_upval *open_upvals;
 };
 
@@ -41,4 +50,6 @@ void init_vm(void);
 void deinit_vm(void);
 void print_func(struct us_proto *proto);
 
+int declare_global(struct us_str *name);
+
 #endif // __USCRIPT_VM_H__