add a callback for when method cache changes

ujit.h

@@ -53,5 +53,6 @@ void rb_ujit_method_lookup_change(VALUE cme_or_cc);
 void rb_ujit_compile_iseq(const rb_iseq_t *iseq);
 void rb_ujit_init(struct rb_ujit_options *options);
 void rb_ujit_bop_redefined(VALUE klass, const rb_method_entry_t *me, enum ruby_basic_operators bop);
+void rb_ujit_constant_state_changed(void);
 
 #endif // #ifndef UJIT_H

ujit_iface.c

@@ -423,6 +423,13 @@ rb_ujit_bop_redefined(VALUE klass, const rb_method_entry_t *me, enum ruby_basic_
     //fprintf(stderr, "bop redefined\n");
 }
 
+/* Called when the constant state changes */
+void
+rb_ujit_constant_state_changed(void)
+{
+    //fprintf(stderr, "bop redefined\n");
+}
+
 #if HAVE_LIBCAPSTONE
 static const rb_data_type_t ujit_disasm_type = {
     "UJIT/Disasm",

vm_method.c

@@ -141,6 +141,7 @@ vm_cme_invalidate(rb_callable_method_entry_t *cme)
 void
 rb_clear_constant_cache(void)
 {
+    rb_ujit_constant_state_changed();
     INC_GLOBAL_CONSTANT_STATE();
 }