Initial commit

1 files changed, 44 insertions, 0 deletions

diff --git a/uscript/vm.h b/uscript/vm.h
new file mode 100644
index 0000000..15c21a0
--- /dev/null
+++ b/uscript/vm.h
@@ -0,0 +1,44 @@
+#ifndef __USCRIPT_VM_H__
+#define __USCRIPT_VM_H__
+
+#include "common.h"
+#include "val.h"
+
+#define MAX_CALL_FRAMES (64)
+#define STACK_SIZE (MAX_CALL_FRAMES * 256)
+
+#define vm_pop()   (*(--vm.stacktop))
+#define vm_peek()  (vm.stacktop[-1])
+#define vm_push(v) (*vm.stacktop++ = (v))
+
+enum bytecode {
+#define BC(name) BC_##name,
+#include "xbytecode.h"
+#undef BC
+};
+
+struct call_frame {
+        struct us_func *func;
+        struct us_val *stackbot;
+};
+
+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 us_upval *open_upvals;
+};
+
+extern struct vm vm;
+
+void init_vm(void);
+void deinit_vm(void);
+void print_func(struct us_proto *proto);
+
+#endif // __USCRIPT_VM_H__