author  bulwahn 
Mon, 04 Apr 2011 14:44:11 +0200  
changeset 42214  9ca13615c619 
parent 42184  1d4fae76ba5e 
child 42258  79cb339d8989 
permissions  rwrr 
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(* Title: HOL/Tools/Quickcheck/narrowing_generators.ML 
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Author: Lukas Bulwahn, TU Muenchen 
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Narrowingbased counterexample generation. 
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*) 
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signature NARROWING_GENERATORS = 
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sig 
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val compile_generator_expr: 

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Proof.context > (term * term list) list > int list > term list option * Quickcheck.report option 
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val put_counterexample: (unit > term list option) > Proof.context > Proof.context 
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val finite_functions : bool Config.T 
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val setup: theory > theory 
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end; 

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structure Narrowing_Generators : NARROWING_GENERATORS = 
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struct 
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(* configurations *) 
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val (finite_functions, setup_finite_functions) = 
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Attrib.config_bool "quickcheck_finite_functions" (K true) 
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(* narrowing specific names and types *) 
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exception FUNCTION_TYPE; 
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val narrowingN = "narrowing"; 
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fun narrowingT T = 
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@{typ Quickcheck_Narrowing.code_int} > Type (@{type_name Quickcheck_Narrowing.cons}, [T]) 
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fun mk_empty T = Const (@{const_name Quickcheck_Narrowing.empty}, narrowingT T) 
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fun mk_cons c T = Const (@{const_name Quickcheck_Narrowing.cons}, T > narrowingT T) $ Const (c, T) 
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fun mk_apply (T, t) (U, u) = 
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let 
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val (_, U') = dest_funT U 
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in 
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(U', Const (@{const_name Quickcheck_Narrowing.apply}, 
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narrowingT U > narrowingT T > narrowingT U') $ u $ t) 
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end 
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fun mk_sum (t, u) = 
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let 
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val T = fastype_of t 
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in 
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Const (@{const_name Quickcheck_Narrowing.sum}, T > T > T) $ t $ u 
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end 
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(* creating narrowing instances *) 
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fun mk_equations descr vs tycos narrowings (Ts, Us) = 
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let 
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fun mk_call T = 
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(T, Const (@{const_name "Quickcheck_Narrowing.narrowing_class.narrowing"}, narrowingT T)) 
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fun mk_aux_call fTs (k, _) (tyco, Ts) = 
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let 
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val T = Type (tyco, Ts) 
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val _ = if not (null fTs) then raise FUNCTION_TYPE else () 
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in 
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(T, nth narrowings k) 
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end 
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fun mk_consexpr simpleT (c, xs) = 
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let 
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val Ts = map fst xs 
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in snd (fold mk_apply xs (Ts > simpleT, mk_cons c (Ts > simpleT))) end 
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fun mk_rhs exprs = foldr1 mk_sum exprs 
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val rhss = 
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Datatype_Aux.interpret_construction descr vs 
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{ atyp = mk_call, dtyp = mk_aux_call } 
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> (map o apfst) Type 
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> map (fn (T, cs) => map (mk_consexpr T) cs) 
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> map mk_rhs 
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val lhss = narrowings 
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val eqs = map (HOLogic.mk_Trueprop o HOLogic.mk_eq) (lhss ~~ rhss) 
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in 
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eqs 
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end 
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fun instantiate_narrowing_datatype config descr vs tycos prfx (names, auxnames) (Ts, Us) thy = 
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let 
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val _ = Datatype_Aux.message config "Creating narrowing generators ..."; 
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val narrowingsN = map (prefix (narrowingN ^ "_")) (names @ auxnames); 
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in 
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thy 
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> Class.instantiation (tycos, vs, @{sort narrowing}) 
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> Quickcheck_Common.define_functions 
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(fn narrowings => mk_equations descr vs tycos narrowings (Ts, Us), NONE) 
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prfx [] narrowingsN (map narrowingT (Ts @ Us)) 
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> Class.prove_instantiation_exit (K (Class.intro_classes_tac [])) 
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end; 
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(* testing framework *) 
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val target = "Haskell" 
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(* invocation of Haskell interpreter *) 
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val narrowing_engine = File.read (Path.explode "~~/src/HOL/Tools/Quickcheck/Narrowing_Engine.hs") 
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fun exec verbose code = 

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ML_Context.exec (fn () => Secure.use_text ML_Env.local_context (0, "generated code") verbose code) 

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fun value ctxt (get, put, put_ml) (code, value) size = 
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let 
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val tmp_prefix = "Quickcheck_Narrowing" 
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fun run in_path = 
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let 

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val code_file = Path.append in_path (Path.basic "Code.hs") 

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val narrowing_engine_file = Path.append in_path (Path.basic "Narrowing_Engine.hs") 
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val main_file = Path.append in_path (Path.basic "Main.hs") 
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val main = "module Main where {\n\n" ^ 

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"import Narrowing_Engine;\n" ^ 
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"import Code;\n\n" ^ 
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"main = Narrowing_Engine.depthCheck " ^ string_of_int size ^ " (Code.value ())\n\n" ^ 
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"}\n" 
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val code' = prefix "module Code where {\n\ndata Typerep = Typerep String [Typerep];\n" 
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(unprefix "module Code where {" code) 
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val _ = File.write code_file code' 
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val _ = File.write narrowing_engine_file narrowing_engine 
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val _ = File.write main_file main 
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val executable = File.shell_path (Path.append in_path (Path.basic "isa_lsc")) 
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val cmd = "( exec \"$ISABELLE_GHC\" fglasgowexts " ^ 
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(space_implode " " (map File.shell_path [code_file, narrowing_engine_file, main_file])) ^ 
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" o " ^ executable ^ "; ) && " ^ executable 
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in 
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bash_output cmd 

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end 
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val result = Isabelle_System.with_tmp_dir tmp_prefix run 
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val output_value = the_default "NONE" 
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(try (snd o split_last o filter_out (fn s => s = "") o split_lines o fst) result) 

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> translate_string (fn s => if s = "\\" then "\\\\" else s) 
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val ml_code = "\nval _ = Context.set_thread_data (SOME (Context.map_proof (" ^ put_ml 
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^ " (fn () => " ^ output_value ^ ")) (ML_Context.the_generic_context ())))"; 

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val ctxt' = ctxt 

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> put (fn () => error ("Bad evaluation for " ^ quote put_ml)) 

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> Context.proof_map (exec false ml_code); 

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in get ctxt' () end; 

141 

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fun evaluation cookie thy evaluator vs_t args size = 
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let 
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val ctxt = ProofContext.init_global thy; 

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val (program_code, value_name) = evaluator vs_t; 

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val value_code = space_implode " " 

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(value_name :: "()" :: map (enclose "(" ")") args); 

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in Exn.interruptible_capture (value ctxt cookie (program_code, value_code)) size end; 
41905  149 

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fun dynamic_value_strict cookie thy postproc t args size = 
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let 
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fun evaluator naming program ((_, vs_ty), t) deps = 

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evaluation cookie thy (Code_Target.evaluator thy target naming program deps) (vs_ty, t) args size; 
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in Exn.release (Code_Thingol.dynamic_value thy (Exn.map_result o postproc) evaluator t) end; 
155 

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(* counterexample generator *) 

157 

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structure Counterexample = Proof_Data 
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( 
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type T = unit > term list option 

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fun init _ () = error "Counterexample" 
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) 
163 

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val put_counterexample = Counterexample.put 
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fun finitize_functions t = 
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let 
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val ((names, Ts), t') = apfst split_list (strip_abs t) 
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fun mk_eval_ffun dT rT = 
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Const (@{const_name "Quickcheck_Narrowing.eval_ffun"}, 
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Type (@{type_name "Quickcheck_Narrowing.ffun"}, [dT, rT]) > dT > rT) 
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fun mk_eval_cfun dT rT = 
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Const (@{const_name "Quickcheck_Narrowing.eval_cfun"}, 
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Type (@{type_name "Quickcheck_Narrowing.cfun"}, [rT]) > dT > rT) 
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fun eval_function (T as Type (@{type_name fun}, [dT, rT])) = 
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let 
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val (rt', rT') = eval_function rT 
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in 
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case dT of 
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Type (@{type_name fun}, _) => 
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(fn t => absdummy (dT, rt' (mk_eval_cfun dT rT' $ incr_boundvars 1 t $ Bound 0)), 
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Type (@{type_name "Quickcheck_Narrowing.cfun"}, [rT'])) 
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 _ => (fn t => absdummy (dT, rt' (mk_eval_ffun dT rT' $ incr_boundvars 1 t $ Bound 0)), 
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Type (@{type_name "Quickcheck_Narrowing.ffun"}, [dT, rT'])) 
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end 
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 eval_function T = (I, T) 
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val (tt, Ts') = split_list (map eval_function Ts) 
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val t'' = subst_bounds (map2 (fn f => fn x => f x) (rev tt) (map_index (Bound o fst) Ts), t') 
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in 
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list_abs (names ~~ Ts', t'') 
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end 
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192 

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fun compile_generator_expr ctxt [(t, eval_terms)] [_, size] = 
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let 
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val thy = ProofContext.theory_of ctxt 

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val t' = list_abs_free (Term.add_frees t [], t) 
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val t'' = if Config.get ctxt finite_functions then finitize_functions t' else t' 
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fun ensure_testable t = 
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Const (@{const_name Quickcheck_Narrowing.ensure_testable}, fastype_of t > fastype_of t) $ t 
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val result = dynamic_value_strict 
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(Counterexample.get, Counterexample.put, "Narrowing_Generators.put_counterexample") 
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thy (Option.map o map) (ensure_testable t'') [] size 
41905  203 
in 
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(result, NONE) 
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end; 
206 

207 

208 
val setup = 

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Datatype.interpretation 
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(Quickcheck_Common.ensure_sort_datatype (@{sort narrowing}, instantiate_narrowing_datatype)) 
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#> setup_finite_functions 
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#> Context.theory_map 
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(Quickcheck.add_generator ("narrowing", compile_generator_expr)) 
41905  214 

215 
end; 