Refactor l2vm

vm/include/stack.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <stddef.h>
+#include <stdint.h>
+
+// uint64_t only
+struct stack {
+    size_t sp, size;
+    uint64_t *data;
+};
+
+int stack_init(struct stack *st, size_t size);
+void stack_free(struct stack *st);
+int stack_push(struct stack *st, uint64_t w);
+int stack_pop(struct stack *st, uint64_t *w);