(* Author: Florian Haftmann, TU Muenchen *)

 header {* Debugging facilities for code generated towards Isabelle/ML *}

 theory Debug

 imports Main

 begin

 definition trace :: "String.literal \<Rightarrow> unit" where

   [simp]: "trace s = ()"

 definition tracing :: "String.literal \<Rightarrow> 'a \<Rightarrow> 'a" where

   [simp]: "tracing s = id"

 lemma [code]:

   "tracing s = (let u = trace s in id)"

   by simp

 definition flush :: "'a \<Rightarrow> unit" where

   [simp]: "flush x = ()"

 definition flushing :: "'a \<Rightarrow> 'b \<Rightarrow> 'b" where

   [simp]: "flushing x = id"

 lemma [code, code_unfold]:

   "flushing x = (let u = flush x in id)"

   by simp

 definition timing :: "String.literal \<Rightarrow> ('a \<Rightarrow> 'b) \<Rightarrow> 'a \<Rightarrow> 'b" where

   [simp]: "timing s f x = f x"

 code_const trace and flush and timing

   (Eval "Output.tracing" and "Output.tracing/ (PolyML.makestring _)" and "Timing.timeap'_msg")

 code_reserved Eval Output PolyML Timing

 hide_const (open) trace tracing flush flushing timing

 end