Implement rb_bug() and rb_fatal() to show the error message passed to them

Author: eregon

lib/cext/ABI_check.txt

@@ -1 +1 @@
-1
+2

lib/truffle/truffle/cext.rb

@@ -1784,6 +1784,14 @@ def rb_f_notimplement
     raise NotImplementedError, "#{function}() function is unimplemented on this machine"
   end
 
+  def rb_bug(message)
+    raise Exception, "rb_bug: #{message}"
+  end
+
+  def rb_fatal(message)
+    raise Exception, "rb_fatal: #{message}"
+  end
+
   def test_kwargs(kwargs, raise_error)
     return false if Primitive.nil?(kwargs)
 

src/main/c/cext/exception.c

@@ -156,11 +156,19 @@ void rb_eof_error(void) {
 }
 
 void rb_tr_bug_va_list(const char *fmt, va_list args) {
-  rb_tr_not_implemented("rb_bug");
+  char buffer[1024];
+  vsnprintf(buffer, 1024, fmt, args);
+  VALUE message = rb_str_new_cstr(buffer);
+  RUBY_CEXT_INVOKE_NO_WRAP("rb_bug", message);
+  UNREACHABLE;
 }
 
 void rb_tr_fatal_va_list(const char *fmt, va_list args) {
-  rb_tr_not_implemented("rb_fatal");
+  char buffer[1024];
+  vsnprintf(buffer, 1024, fmt, args);
+  VALUE message = rb_str_new_cstr(buffer);
+  RUBY_CEXT_INVOKE_NO_WRAP("rb_fatal", message);
+  UNREACHABLE;
 }
 
 VALUE rb_make_exception(int argc, const VALUE *argv) {