1 (* Title: HOL/SMT/Tools/z3_solver.ML |
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2 Author: Sascha Boehme, TU Muenchen |
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3 |
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4 Interface of the SMT solver Z3. |
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5 *) |
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6 |
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7 signature Z3_SOLVER = |
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8 sig |
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9 val proofs: bool Config.T |
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10 val options: string Config.T |
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11 val setup: theory -> theory |
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12 end |
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13 |
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14 structure Z3_Solver: Z3_SOLVER = |
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15 struct |
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16 |
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17 val solver_name = "z3" |
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18 val env_var = "Z3_SOLVER" |
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19 |
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20 val (proofs, proofs_setup) = Attrib.config_bool "z3_proofs" (K false) |
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21 val (options, options_setup) = Attrib.config_string "z3_options" (K "") |
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22 |
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23 fun add xs ys = ys @ xs |
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24 |
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25 fun explode_options s = String.tokens (Symbol.is_ascii_blank o str) s |
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26 |
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27 fun get_options ctxt = |
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28 ["MODEL=true", "PRE_SIMPLIFY_EXPR=false", "CONTEXT_SIMPLIFIER=false"] |
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29 |> Config.get ctxt proofs ? add ["DISPLAY_PROOF=true", "PROOF_MODE=2"] |
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30 |> add (explode_options (Config.get ctxt options)) |
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31 |
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32 fun pretty_config context = [ |
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33 Pretty.str ("With proofs: " ^ |
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34 (if Config.get_generic context proofs then "true" else "false")), |
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35 Pretty.str ("Options: " ^ |
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36 space_implode " " (get_options (Context.proof_of context))) ] |
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37 |
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38 fun cmdline_options ctxt = |
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39 get_options ctxt |
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40 |> add ["-smt"] |
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41 |
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42 fun raise_cex real recon ls = |
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43 let val cex = Z3_Model.parse_counterex recon ls |
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44 in raise SMT_Solver.SMT_COUNTEREXAMPLE (real, cex) end |
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45 |
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46 fun if_unsat f (output, recon) = |
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47 let |
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48 fun jnk l = |
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49 String.isPrefix "WARNING" l orelse |
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50 String.isPrefix "ERROR" l orelse |
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51 forall Symbol.is_ascii_blank (Symbol.explode l) |
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52 val (ls, l) = the_default ([], "") (try split_last (filter_out jnk output)) |
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53 in |
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54 if String.isPrefix "unsat" l then f (ls, recon) |
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55 else if String.isPrefix "sat" l then raise_cex true recon ls |
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56 else if String.isPrefix "unknown" l then raise_cex false recon ls |
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57 else raise SMT_Solver.SMT (solver_name ^ " failed") |
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58 end |
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59 |
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60 val core_oracle = if_unsat (K @{cprop False}) |
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61 |
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62 val prover = if_unsat Z3_Proof_Reconstruction.reconstruct |
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63 |
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64 fun solver oracle ctxt = |
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65 let val with_proof = Config.get ctxt proofs |
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66 in |
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67 {command = {env_var=env_var, remote_name=SOME solver_name}, |
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68 arguments = cmdline_options ctxt, |
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69 interface = Z3_Interface.interface, |
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70 reconstruct = if with_proof then prover else pair o oracle} |
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71 end |
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72 |
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73 val setup = |
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74 proofs_setup #> |
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75 options_setup #> |
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76 Thm.add_oracle (Binding.name solver_name, core_oracle) #-> (fn (_, oracle) => |
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77 SMT_Solver.add_solver (solver_name, solver oracle)) #> |
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78 SMT_Solver.add_solver_info (solver_name, pretty_config) |
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79 |
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80 end |
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