src/HOL/Tools/sat_solver.ML
author wenzelm
Sun, 01 Mar 2009 23:36:12 +0100
changeset 30190 479806475f3c
parent 29872 14e208d607af
child 30237 e6f76bf0e067
permissions -rw-r--r--
use long names for old-style fold combinators;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     1
(*  Title:      HOL/Tools/sat_solver.ML
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     2
    ID:         $Id$
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     3
    Author:     Tjark Weber
21267
5294ecae6708 interpreters for fst and snd added
webertj
parents: 20463
diff changeset
     4
    Copyright   2004-2006
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     5
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     6
Interface to external SAT solvers, and (simple) built-in SAT solvers.
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     7
*)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     8
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
     9
signature SAT_SOLVER =
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    10
sig
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    11
  exception NOT_CONFIGURED
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    12
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    13
  type assignment = int -> bool option
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    14
  type proof      = int list Inttab.table * int
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    15
  datatype result = SATISFIABLE of assignment
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    16
                  | UNSATISFIABLE of proof option
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    17
                  | UNKNOWN
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    18
  type solver     = PropLogic.prop_formula -> result
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    19
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    20
  (* auxiliary functions to create external SAT solvers *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    21
  val write_dimacs_cnf_file : Path.T -> PropLogic.prop_formula -> unit
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    22
  val write_dimacs_sat_file : Path.T -> PropLogic.prop_formula -> unit
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    23
  val read_std_result_file  : Path.T -> string * string * string -> result
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    24
  val make_external_solver  : string -> (PropLogic.prop_formula -> unit) -> (unit -> result) -> solver
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    25
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    26
  val read_dimacs_cnf_file : Path.T -> PropLogic.prop_formula
15040
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
    27
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    28
  (* generic solver interface *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    29
  val solvers       : (string * solver) list ref
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    30
  val add_solver    : string * solver -> unit
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    31
  val invoke_solver : string -> solver  (* exception Option *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    32
end;
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    33
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    34
structure SatSolver : SAT_SOLVER =
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    35
struct
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    36
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    37
  open PropLogic;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    38
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    39
(* ------------------------------------------------------------------------- *)
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    40
(* should be raised by an external SAT solver to indicate that the solver is *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    41
(* not configured properly                                                   *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    42
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    43
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    44
  exception NOT_CONFIGURED;
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    45
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    46
(* ------------------------------------------------------------------------- *)
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 15332
diff changeset
    47
(* type of partial (satisfying) assignments: 'a i = NONE' means that 'a' is  *)
19190
7c311c513bae fixed a typo in a comment
webertj
parents: 18678
diff changeset
    48
(*      a satisfying assignment regardless of the value of variable 'i'      *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    49
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    50
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    51
  type assignment = int -> bool option;
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    52
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    53
(* ------------------------------------------------------------------------- *)
17493
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    54
(* a proof of unsatisfiability, to be interpreted as follows: each integer   *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    55
(*      is a clause ID, each list 'xs' stored under the key 'x' in the table *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    56
(*      contains the IDs of clauses that must be resolved (in the given      *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    57
(*      order) to obtain the new clause 'x'.  Each list 'xs' must be         *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    58
(*      non-empty, and the literal to be resolved upon must always be unique *)
17494
e70600834f44 using curried Inttab.update_new function now
webertj
parents: 17493
diff changeset
    59
(*      (e.g. "A | ~B" must not be resolved with "~A | B").  Circular        *)
17493
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    60
(*      dependencies of clauses are not allowed.  (At least) one of the      *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    61
(*      clauses in the table must be the empty clause (i.e. contain no       *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    62
(*      literals); its ID is given by the second component of the proof.     *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    63
(*      The clauses of the original problem passed to the SAT solver have    *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    64
(*      consecutive IDs starting with 0.  Clause IDs must be non-negative,   *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    65
(*      but do not need to be consecutive.                                   *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    66
(* ------------------------------------------------------------------------- *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    67
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    68
  type proof = int list Inttab.table * int;
17493
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    69
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    70
(* ------------------------------------------------------------------------- *)
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    71
(* return type of SAT solvers: if the result is 'SATISFIABLE', a satisfying  *)
17493
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    72
(*      assignment must be returned as well; if the result is                *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
    73
(*      'UNSATISFIABLE', a proof of unsatisfiability may be returned         *)
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    74
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    75
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    76
  datatype result = SATISFIABLE of assignment
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    77
                  | UNSATISFIABLE of proof option
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    78
                  | UNKNOWN;
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    79
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    80
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    81
(* type of SAT solvers: given a propositional formula, a satisfying          *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    82
(*      assignment may be returned                                           *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    83
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    84
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    85
  type solver = prop_formula -> result;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    86
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    87
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    88
(* write_dimacs_cnf_file: serializes a formula 'fm' of propositional logic   *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    89
(*      to a file in DIMACS CNF format (see "Satisfiability Suggested        *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    90
(*      Format", May 8 1993, Section 2.1)                                    *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    91
(* Note: 'fm' must not contain a variable index less than 1.                 *)
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
    92
(* Note: 'fm' must be given in CNF.                                          *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    93
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    94
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    95
  (* Path.T -> prop_formula -> unit *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
    96
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    97
  fun write_dimacs_cnf_file path fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    98
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
    99
    (* prop_formula -> prop_formula *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   100
    fun cnf_True_False_elim True =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   101
      Or (BoolVar 1, Not (BoolVar 1))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   102
      | cnf_True_False_elim False =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   103
      And (BoolVar 1, Not (BoolVar 1))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   104
      | cnf_True_False_elim fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   105
      fm  (* since 'fm' is in CNF, either 'fm'='True'/'False', or 'fm' does not contain 'True'/'False' at all *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   106
    (* prop_formula -> int *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   107
    fun cnf_number_of_clauses (And (fm1,fm2)) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   108
      (cnf_number_of_clauses fm1) + (cnf_number_of_clauses fm2)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   109
      | cnf_number_of_clauses _ =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   110
      1
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   111
    (* prop_formula -> string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   112
    fun cnf_string fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   113
    let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   114
      (* prop_formula -> string list -> string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   115
      fun cnf_string_acc True acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   116
        error "formula is not in CNF"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   117
        | cnf_string_acc False acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   118
        error "formula is not in CNF"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   119
        | cnf_string_acc (BoolVar i) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   120
        (i>=1 orelse error "formula contains a variable index less than 1";
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   121
        string_of_int i :: acc)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   122
        | cnf_string_acc (Not (BoolVar i)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   123
        "-" :: cnf_string_acc (BoolVar i) acc
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   124
        | cnf_string_acc (Not _) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   125
        error "formula is not in CNF"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   126
        | cnf_string_acc (Or (fm1,fm2)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   127
        cnf_string_acc fm1 (" " :: cnf_string_acc fm2 acc)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   128
        | cnf_string_acc (And (fm1,fm2)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   129
        cnf_string_acc fm1 (" 0\n" :: cnf_string_acc fm2 acc)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   130
    in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   131
      cnf_string_acc fm []
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   132
    end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   133
    val fm'               = cnf_True_False_elim fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   134
    val number_of_vars    = maxidx fm'
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   135
    val number_of_clauses = cnf_number_of_clauses fm'
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   136
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   137
    File.write path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   138
      ("c This file was generated by SatSolver.write_dimacs_cnf_file\n" ^
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   139
       "p cnf " ^ string_of_int number_of_vars ^ " " ^ string_of_int number_of_clauses ^ "\n");
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   140
    File.append_list path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   141
      (cnf_string fm');
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   142
    File.append path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   143
      " 0\n"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   144
  end;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   145
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   146
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   147
(* write_dimacs_sat_file: serializes a formula 'fm' of propositional logic   *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   148
(*      to a file in DIMACS SAT format (see "Satisfiability Suggested        *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   149
(*      Format", May 8 1993, Section 2.2)                                    *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   150
(* Note: 'fm' must not contain a variable index less than 1.                 *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   151
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   152
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   153
  (* Path.T -> prop_formula -> unit *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   154
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   155
  fun write_dimacs_sat_file path fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   156
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   157
    (* prop_formula -> string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   158
    fun sat_string fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   159
    let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   160
      (* prop_formula -> string list -> string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   161
      fun sat_string_acc True acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   162
        "*()" :: acc
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   163
        | sat_string_acc False acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   164
        "+()" :: acc
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   165
        | sat_string_acc (BoolVar i) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   166
        (i>=1 orelse error "formula contains a variable index less than 1";
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   167
        string_of_int i :: acc)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   168
        | sat_string_acc (Not (BoolVar i)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   169
        "-" :: sat_string_acc (BoolVar i) acc
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   170
        | sat_string_acc (Not fm) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   171
        "-(" :: sat_string_acc fm (")" :: acc)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   172
        | sat_string_acc (Or (fm1,fm2)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   173
        "+(" :: sat_string_acc_or fm1 (" " :: sat_string_acc_or fm2 (")" :: acc))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   174
        | sat_string_acc (And (fm1,fm2)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   175
        "*(" :: sat_string_acc_and fm1 (" " :: sat_string_acc_and fm2 (")" :: acc))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   176
      (* optimization to make use of n-ary disjunction/conjunction *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   177
      (* prop_formula -> string list -> string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   178
      and sat_string_acc_or (Or (fm1,fm2)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   179
        sat_string_acc_or fm1 (" " :: sat_string_acc_or fm2 acc)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   180
        | sat_string_acc_or fm acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   181
        sat_string_acc fm acc
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   182
      (* prop_formula -> string list -> string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   183
      and sat_string_acc_and (And (fm1,fm2)) acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   184
        sat_string_acc_and fm1 (" " :: sat_string_acc_and fm2 acc)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   185
        | sat_string_acc_and fm acc =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   186
        sat_string_acc fm acc
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   187
    in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   188
      sat_string_acc fm []
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   189
    end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   190
    val number_of_vars = Int.max (maxidx fm, 1)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   191
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   192
    File.write path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   193
      ("c This file was generated by SatSolver.write_dimacs_sat_file\n" ^
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   194
       "p sat " ^ string_of_int number_of_vars ^ "\n" ^
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   195
       "(");
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   196
    File.append_list path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   197
      (sat_string fm);
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   198
    File.append path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   199
      ")\n"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   200
  end;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   201
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   202
(* ------------------------------------------------------------------------- *)
17620
49568e5e0450 parse_std_result_file renamed to read_std_result_file
webertj
parents: 17581
diff changeset
   203
(* read_std_result_file: scans a SAT solver's output file for a satisfying   *)
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   204
(*      variable assignment.  Returns the assignment, or 'UNSATISFIABLE' if  *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   205
(*      the file contains 'unsatisfiable', or 'UNKNOWN' if the file contains *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   206
(*      neither 'satisfiable' nor 'unsatisfiable'.  Empty lines are ignored. *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   207
(*      The assignment must be given in one or more lines immediately after  *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   208
(*      the line that contains 'satisfiable'.  These lines must begin with   *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   209
(*      'assignment_prefix'.  Variables must be separated by " ".  Non-      *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   210
(*      integer strings are ignored.  If variable i is contained in the      *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   211
(*      assignment, then i is interpreted as 'true'.  If ~i is contained in  *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   212
(*      the assignment, then i is interpreted as 'false'.  Otherwise the     *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   213
(*      value of i is taken to be unspecified.                               *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   214
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   215
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   216
  (* Path.T -> string * string * string -> result *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   217
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   218
  fun read_std_result_file path (satisfiable, assignment_prefix, unsatisfiable) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   219
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   220
    (* string -> int list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   221
    fun int_list_from_string s =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   222
      List.mapPartial Int.fromString (space_explode " " s)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   223
    (* int list -> assignment *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   224
    fun assignment_from_list [] i =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   225
      NONE  (* the SAT solver didn't provide a value for this variable *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   226
      | assignment_from_list (x::xs) i =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   227
      if x=i then (SOME true)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   228
      else if x=(~i) then (SOME false)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   229
      else assignment_from_list xs i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   230
    (* int list -> string list -> assignment *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   231
    fun parse_assignment xs [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   232
      assignment_from_list xs
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   233
      | parse_assignment xs (line::lines) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   234
      if String.isPrefix assignment_prefix line then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   235
        parse_assignment (xs @ int_list_from_string line) lines
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   236
      else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   237
        assignment_from_list xs
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   238
    (* string -> string -> bool *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   239
    fun is_substring needle haystack =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   240
    let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   241
      val length1 = String.size needle
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   242
      val length2 = String.size haystack
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   243
    in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   244
      if length2 < length1 then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   245
        false
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   246
      else if needle = String.substring (haystack, 0, length1) then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   247
        true
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   248
      else is_substring needle (String.substring (haystack, 1, length2-1))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   249
    end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   250
    (* string list -> result *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   251
    fun parse_lines [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   252
      UNKNOWN
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   253
      | parse_lines (line::lines) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   254
      if is_substring unsatisfiable line then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   255
        UNSATISFIABLE NONE
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   256
      else if is_substring satisfiable line then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   257
        SATISFIABLE (parse_assignment [] lines)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   258
      else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   259
        parse_lines lines
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   260
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   261
    (parse_lines o (List.filter (fn l => l <> "")) o split_lines o File.read) path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   262
  end;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   263
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   264
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   265
(* make_external_solver: call 'writefn', execute 'cmd', call 'readfn'        *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   266
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   267
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   268
  (* string -> (PropLogic.prop_formula -> unit) -> (unit -> result) -> solver *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   269
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   270
  fun make_external_solver cmd writefn readfn fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   271
    (writefn fm; system cmd; readfn ());
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   272
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   273
(* ------------------------------------------------------------------------- *)
15040
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
   274
(* read_dimacs_cnf_file: returns a propositional formula that corresponds to *)
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
   275
(*      a SAT problem given in DIMACS CNF format                             *)
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
   276
(* ------------------------------------------------------------------------- *)
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
   277
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   278
  (* Path.T -> PropLogic.prop_formula *)
15040
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
   279
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   280
  fun read_dimacs_cnf_file path =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   281
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   282
    (* string list -> string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   283
    fun filter_preamble [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   284
      error "problem line not found in DIMACS CNF file"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   285
      | filter_preamble (line::lines) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   286
      if String.isPrefix "c " line orelse line = "c" then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   287
        (* ignore comments *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   288
        filter_preamble lines
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   289
      else if String.isPrefix "p " line then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   290
        (* ignore the problem line (which must be the last line of the preamble) *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   291
        (* Ignoring the problem line implies that if the file contains more clauses *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   292
        (* or variables than specified in its preamble, we will accept it anyway.   *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   293
        lines
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   294
      else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   295
        error "preamble in DIMACS CNF file contains a line that does not begin with \"c \" or \"p \""
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   296
    (* string -> int *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   297
    fun int_from_string s =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   298
      case Int.fromString s of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   299
        SOME i => i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   300
      | NONE   => error ("token " ^ quote s ^ "in DIMACS CNF file is not a number")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   301
    (* int list -> int list list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   302
    fun clauses xs =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   303
      let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   304
        val (xs1, xs2) = take_prefix (fn i => i <> 0) xs
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   305
      in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   306
        case xs2 of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   307
          []      => [xs1]
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   308
        | (0::[]) => [xs1]
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   309
        | (0::tl) => xs1 :: clauses tl
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   310
        | _       => sys_error "this cannot happen"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   311
      end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   312
    (* int -> PropLogic.prop_formula *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   313
    fun literal_from_int i =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   314
      (i<>0 orelse error "variable index in DIMACS CNF file is 0";
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   315
      if i>0 then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   316
        PropLogic.BoolVar i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   317
      else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   318
        PropLogic.Not (PropLogic.BoolVar (~i)))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   319
    (* PropLogic.prop_formula list -> PropLogic.prop_formula *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   320
    fun disjunction [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   321
      error "empty clause in DIMACS CNF file"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   322
      | disjunction (x::xs) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   323
      (case xs of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   324
        [] => x
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   325
      | _  => PropLogic.Or (x, disjunction xs))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   326
    (* PropLogic.prop_formula list -> PropLogic.prop_formula *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   327
    fun conjunction [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   328
      error "no clause in DIMACS CNF file"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   329
      | conjunction (x::xs) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   330
      (case xs of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   331
        [] => x
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   332
      | _  => PropLogic.And (x, conjunction xs))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   333
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   334
    (conjunction
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   335
    o (map disjunction)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   336
    o (map (map literal_from_int))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   337
    o clauses
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   338
    o (map int_from_string)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   339
    o List.concat
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   340
    o (map (String.fields (fn c => c mem [#" ", #"\t", #"\n"])))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   341
    o filter_preamble
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   342
    o (List.filter (fn l => l <> ""))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   343
    o split_lines
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   344
    o File.read)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   345
      path
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   346
  end;
15040
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
   347
ed574b4f7e70 read_dimacs_cnf_file added
webertj
parents: 14999
diff changeset
   348
(* ------------------------------------------------------------------------- *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   349
(* solvers: a (reference to a) table of all registered SAT solvers           *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   350
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   351
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   352
  val solvers = ref ([] : (string * solver) list);
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   353
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   354
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   355
(* add_solver: updates 'solvers' by adding a new solver                      *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   356
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   357
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   358
  (* string * solver -> unit *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   359
22220
6dc8d0dca678 dropped Output.update_warn
haftmann
parents: 21858
diff changeset
   360
    fun add_solver (name, new_solver) =
6dc8d0dca678 dropped Output.update_warn
haftmann
parents: 21858
diff changeset
   361
      let
6dc8d0dca678 dropped Output.update_warn
haftmann
parents: 21858
diff changeset
   362
        val the_solvers = !solvers;
6dc8d0dca678 dropped Output.update_warn
haftmann
parents: 21858
diff changeset
   363
        val _ = if AList.defined (op =) the_solvers name
6dc8d0dca678 dropped Output.update_warn
haftmann
parents: 21858
diff changeset
   364
          then warning ("SAT solver " ^ quote name ^ " was defined before")
6dc8d0dca678 dropped Output.update_warn
haftmann
parents: 21858
diff changeset
   365
          else ();
6dc8d0dca678 dropped Output.update_warn
haftmann
parents: 21858
diff changeset
   366
      in solvers := AList.update (op =) (name, new_solver) the_solvers end;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   367
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   368
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   369
(* invoke_solver: returns the solver associated with the given 'name'        *)
15605
0c544d8b521f minor Library.option related modifications
webertj
parents: 15570
diff changeset
   370
(* Note: If no solver is associated with 'name', exception 'Option' will be  *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   371
(*       raised.                                                             *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   372
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   373
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   374
  (* string -> solver *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   375
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   376
  fun invoke_solver name =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   377
    (the o AList.lookup (op =) (!solvers)) name;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   378
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   379
end;  (* SatSolver *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   380
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   381
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   382
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   383
(* Predefined SAT solvers                                                    *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   384
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   385
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   386
(* ------------------------------------------------------------------------- *)
14753
f40b45db8cf0 Comments fixed
webertj
parents: 14703
diff changeset
   387
(* Internal SAT solver, available as 'SatSolver.invoke_solver "enumerate"'   *)
f40b45db8cf0 Comments fixed
webertj
parents: 14703
diff changeset
   388
(* -- simply enumerates assignments until a satisfying assignment is found   *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   389
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   390
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   391
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   392
  fun enum_solver fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   393
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   394
    (* int list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   395
    val indices = PropLogic.indices fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   396
    (* int list -> int list -> int list option *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   397
    (* binary increment: list 'xs' of current bits, list 'ys' of all bits (lower bits first) *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   398
    fun next_list _ ([]:int list) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   399
      NONE
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   400
      | next_list [] (y::ys) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   401
      SOME [y]
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   402
      | next_list (x::xs) (y::ys) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   403
      if x=y then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   404
        (* reset the bit, continue *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   405
        next_list xs ys
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   406
      else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   407
        (* set the lowest bit that wasn't set before, keep the higher bits *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   408
        SOME (y::x::xs)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   409
    (* int list -> int -> bool *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   410
    fun assignment_from_list xs i =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   411
      i mem xs
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   412
    (* int list -> SatSolver.result *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   413
    fun solver_loop xs =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   414
      if PropLogic.eval (assignment_from_list xs) fm then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   415
        SatSolver.SATISFIABLE (SOME o (assignment_from_list xs))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   416
      else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   417
        (case next_list xs indices of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   418
          SOME xs' => solver_loop xs'
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   419
        | NONE     => SatSolver.UNSATISFIABLE NONE)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   420
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   421
    (* start with the "first" assignment (all variables are interpreted as 'false') *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   422
    solver_loop []
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   423
  end
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   424
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   425
  SatSolver.add_solver ("enumerate", enum_solver)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   426
end;
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   427
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   428
(* ------------------------------------------------------------------------- *)
14753
f40b45db8cf0 Comments fixed
webertj
parents: 14703
diff changeset
   429
(* Internal SAT solver, available as 'SatSolver.invoke_solver "dpll"' -- a   *)
f40b45db8cf0 Comments fixed
webertj
parents: 14703
diff changeset
   430
(* simple implementation of the DPLL algorithm (cf. L. Zhang, S. Malik: "The *)
f40b45db8cf0 Comments fixed
webertj
parents: 14703
diff changeset
   431
(* Quest for Efficient Boolean Satisfiability Solvers", July 2002, Fig. 1).  *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   432
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   433
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   434
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   435
  local
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   436
    open PropLogic
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   437
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   438
    fun dpll_solver fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   439
    let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   440
      (* We could use 'PropLogic.defcnf fm' instead of 'PropLogic.nnf fm' *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   441
      (* but that sometimes leads to worse performance due to the         *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   442
      (* introduction of additional variables.                            *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   443
      val fm' = PropLogic.nnf fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   444
      (* int list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   445
      val indices = PropLogic.indices fm'
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   446
      (* int list -> int -> prop_formula *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   447
      fun partial_var_eval []      i = BoolVar i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   448
        | partial_var_eval (x::xs) i = if x=i then True else if x=(~i) then False else partial_var_eval xs i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   449
      (* int list -> prop_formula -> prop_formula *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   450
      fun partial_eval xs True             = True
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   451
        | partial_eval xs False            = False
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   452
        | partial_eval xs (BoolVar i)      = partial_var_eval xs i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   453
        | partial_eval xs (Not fm)         = SNot (partial_eval xs fm)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   454
        | partial_eval xs (Or (fm1, fm2))  = SOr (partial_eval xs fm1, partial_eval xs fm2)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   455
        | partial_eval xs (And (fm1, fm2)) = SAnd (partial_eval xs fm1, partial_eval xs fm2)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   456
      (* prop_formula -> int list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   457
      fun forced_vars True              = []
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   458
        | forced_vars False             = []
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   459
        | forced_vars (BoolVar i)       = [i]
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   460
        | forced_vars (Not (BoolVar i)) = [~i]
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   461
        | forced_vars (Or (fm1, fm2))   = (forced_vars fm1) inter_int (forced_vars fm2)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   462
        | forced_vars (And (fm1, fm2))  = (forced_vars fm1) union_int (forced_vars fm2)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   463
        (* Above, i *and* ~i may be forced.  In this case the first occurrence takes   *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   464
        (* precedence, and the next partial evaluation of the formula returns 'False'. *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   465
        | forced_vars _                 = error "formula is not in negation normal form"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   466
      (* int list -> prop_formula -> (int list * prop_formula) *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   467
      fun eval_and_force xs fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   468
      let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   469
        val fm' = partial_eval xs fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   470
        val xs' = forced_vars fm'
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   471
      in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   472
        if null xs' then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   473
          (xs, fm')
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   474
        else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   475
          eval_and_force (xs@xs') fm'  (* xs and xs' should be distinct, so '@' here should have *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   476
                                       (* the same effect as 'union_int'                         *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   477
      end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   478
      (* int list -> int option *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   479
      fun fresh_var xs =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   480
        Library.find_first (fn i => not (i mem_int xs) andalso not ((~i) mem_int xs)) indices
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   481
      (* int list -> prop_formula -> int list option *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   482
      (* partial assignment 'xs' *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   483
      fun dpll xs fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   484
      let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   485
        val (xs', fm') = eval_and_force xs fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   486
      in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   487
        case fm' of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   488
          True  => SOME xs'
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   489
        | False => NONE
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   490
        | _     =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   491
          let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   492
            val x = valOf (fresh_var xs')  (* a fresh variable must exist since 'fm' did not evaluate to 'True'/'False' *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   493
          in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   494
            case dpll (x::xs') fm' of  (* passing fm' rather than fm should save some simplification work *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   495
              SOME xs'' => SOME xs''
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   496
            | NONE      => dpll ((~x)::xs') fm'  (* now try interpreting 'x' as 'False' *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   497
          end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   498
      end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   499
      (* int list -> assignment *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   500
      fun assignment_from_list [] i =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   501
        NONE  (* the DPLL procedure didn't provide a value for this variable *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   502
        | assignment_from_list (x::xs) i =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   503
        if x=i then (SOME true)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   504
        else if x=(~i) then (SOME false)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   505
        else assignment_from_list xs i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   506
    in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   507
      (* initially, no variable is interpreted yet *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   508
      case dpll [] fm' of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   509
        SOME assignment => SatSolver.SATISFIABLE (assignment_from_list assignment)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   510
      | NONE            => SatSolver.UNSATISFIABLE NONE
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   511
    end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   512
  end  (* local *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   513
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   514
  SatSolver.add_solver ("dpll", dpll_solver)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   515
end;
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   516
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   517
(* ------------------------------------------------------------------------- *)
14753
f40b45db8cf0 Comments fixed
webertj
parents: 14703
diff changeset
   518
(* Internal SAT solver, available as 'SatSolver.invoke_solver "auto"': uses  *)
17577
e87bf1d8f17a zchaff_with_proofs does not delete zChaff\s resolve_trace file anymore
webertj
parents: 17541
diff changeset
   519
(* the last installed solver (other than "auto" itself) that does not raise  *)
15299
576fd0b65ed8 solver auto now returns the result of the first solver that does not raise NOT_CONFIGURED (which may be UNKNOWN)
webertj
parents: 15128
diff changeset
   520
(* 'NOT_CONFIGURED'.  (However, the solver may return 'UNKNOWN'.)            *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   521
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   522
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   523
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   524
  fun auto_solver fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   525
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   526
    fun loop [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   527
      SatSolver.UNKNOWN
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   528
      | loop ((name, solver)::solvers) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   529
      if name="auto" then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   530
        (* do not call solver "auto" from within "auto" *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   531
        loop solvers
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   532
      else (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   533
        (if name="dpll" orelse name="enumerate" then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   534
          warning ("Using SAT solver " ^ quote name ^ "; for better performance, consider using an external solver.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   535
        else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   536
          tracing ("Using SAT solver " ^ quote name ^ "."));
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   537
        (* apply 'solver' to 'fm' *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   538
        solver fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   539
          handle SatSolver.NOT_CONFIGURED => loop solvers
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   540
      )
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   541
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   542
    loop (!SatSolver.solvers)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   543
  end
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   544
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   545
  SatSolver.add_solver ("auto", auto_solver)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   546
end;
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   547
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   548
(* ------------------------------------------------------------------------- *)
20033
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   549
(* MiniSat 1.14                                                              *)
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   550
(* (http://www.cs.chalmers.se/Cs/Research/FormalMethods/MiniSat/)            *)
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   551
(* ------------------------------------------------------------------------- *)
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   552
20135
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   553
(* ------------------------------------------------------------------------- *)
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   554
(* "minisat_with_proofs" requires a modified version of MiniSat 1.14 by John *)
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   555
(* Matthews, which can output ASCII proof traces.  Replaying binary proof    *)
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   556
(* traces generated by MiniSat-p_v1.14 has _not_ been implemented.           *)
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   557
(* ------------------------------------------------------------------------- *)
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   558
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   559
(* add "minisat_with_proofs" _before_ "minisat" to the available solvers, so *)
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   560
(* that the latter is preferred by the "auto" solver                         *)
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   561
20152
b6373fe199e1 MiniSat proof trace format changed; MiniSat is now expected to produce a proof also for "trivial" problems
webertj
parents: 20137
diff changeset
   562
(* There is a complication that is dealt with in the code below: MiniSat     *)
b6373fe199e1 MiniSat proof trace format changed; MiniSat is now expected to produce a proof also for "trivial" problems
webertj
parents: 20137
diff changeset
   563
(* introduces IDs for original clauses in the proof trace.  It does not (in  *)
b6373fe199e1 MiniSat proof trace format changed; MiniSat is now expected to produce a proof also for "trivial" problems
webertj
parents: 20137
diff changeset
   564
(* general) follow the convention that the original clauses are numbered     *)
b6373fe199e1 MiniSat proof trace format changed; MiniSat is now expected to produce a proof also for "trivial" problems
webertj
parents: 20137
diff changeset
   565
(* from 0 to n-1 (where n is the number of clauses in the formula).          *)
20135
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   566
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   567
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   568
  exception INVALID_PROOF of string
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   569
  fun minisat_with_proofs fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   570
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   571
    val _          = if (getenv "MINISAT_HOME") = "" then raise SatSolver.NOT_CONFIGURED else ()
29872
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   572
    val serial_str = serial_string ()
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   573
    val inpath     = File.tmp_path (Path.explode ("isabelle" ^ serial_str ^ ".cnf"))
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   574
    val outpath    = File.tmp_path (Path.explode ("result" ^ serial_str))
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   575
    val proofpath  = File.tmp_path (Path.explode ("result" ^ serial_str ^ ".prf"))
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   576
    val cmd        = (getenv "MINISAT_HOME") ^ "/minisat " ^ (Path.implode inpath) ^ " -r " ^ (Path.implode outpath) ^ " -t " ^ (Path.implode proofpath) ^ "> /dev/null"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   577
    fun writefn fm = SatSolver.write_dimacs_cnf_file inpath fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   578
    fun readfn ()  = SatSolver.read_std_result_file outpath ("SAT", "", "UNSAT")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   579
    val _          = if File.exists inpath then warning ("overwriting existing file " ^ quote (Path.implode inpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   580
    val _          = if File.exists outpath then warning ("overwriting existing file " ^ quote (Path.implode outpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   581
    val cnf        = PropLogic.defcnf fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   582
    val result     = SatSolver.make_external_solver cmd writefn readfn cnf
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   583
    val _          = try File.rm inpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   584
    val _          = try File.rm outpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   585
  in  case result of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   586
    SatSolver.UNSATISFIABLE NONE =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   587
    (let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   588
      (* string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   589
      val proof_lines = (split_lines o File.read) proofpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   590
        handle IO.Io _ => raise INVALID_PROOF "Could not read file \"result.prf\""
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   591
      (* representation of clauses as ordered lists of literals (with duplicates removed) *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   592
      (* prop_formula -> int list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   593
      fun clause_to_lit_list (PropLogic.Or (fm1, fm2)) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   594
        OrdList.union int_ord (clause_to_lit_list fm1) (clause_to_lit_list fm2)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   595
        | clause_to_lit_list (PropLogic.BoolVar i) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   596
        [i]
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   597
        | clause_to_lit_list (PropLogic.Not (PropLogic.BoolVar i)) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   598
        [~i]
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   599
        | clause_to_lit_list _ =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   600
        raise INVALID_PROOF "Error: invalid clause in CNF formula."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   601
      (* prop_formula -> int *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   602
      fun cnf_number_of_clauses (PropLogic.And (fm1, fm2)) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   603
        cnf_number_of_clauses fm1 + cnf_number_of_clauses fm2
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   604
        | cnf_number_of_clauses _ =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   605
        1
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   606
      val number_of_clauses = cnf_number_of_clauses cnf
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   607
      (* int list array *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   608
      val clauses = Array.array (number_of_clauses, [])
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   609
      (* initialize the 'clauses' array *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   610
      (* prop_formula * int -> int *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   611
      fun init_array (PropLogic.And (fm1, fm2), n) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   612
        init_array (fm2, init_array (fm1, n))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   613
        | init_array (fm, n) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   614
        (Array.update (clauses, n, clause_to_lit_list fm); n+1)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   615
      val _ = init_array (cnf, 0)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   616
      (* optimization for the common case where MiniSat "R"s clauses in their *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   617
      (* original order:                                                      *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   618
      val last_ref_clause = ref (number_of_clauses - 1)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   619
      (* search the 'clauses' array for the given list of literals 'lits', *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   620
      (* starting at index '!last_ref_clause + 1'                          *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   621
      (* int list -> int option *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   622
      fun original_clause_id lits =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   623
      let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   624
        fun original_clause_id_from index =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   625
          if index = number_of_clauses then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   626
            (* search from beginning again *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   627
            original_clause_id_from 0
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   628
          (* both 'lits' and the list of literals used in 'clauses' are sorted, so *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   629
          (* testing for equality should suffice -- barring duplicate literals     *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   630
          else if Array.sub (clauses, index) = lits then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   631
            (* success *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   632
            last_ref_clause := index;
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   633
            SOME index
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   634
          ) else if index = !last_ref_clause then
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   635
            (* failure *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   636
            NONE
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   637
          else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   638
            (* continue search *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   639
            original_clause_id_from (index + 1)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   640
      in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   641
        original_clause_id_from (!last_ref_clause + 1)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   642
      end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   643
      (* string -> int *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   644
      fun int_from_string s = (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   645
        case Int.fromString s of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   646
          SOME i => i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   647
        | NONE   => raise INVALID_PROOF ("File format error: number expected (" ^ quote s ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   648
      )
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   649
      (* parse the proof file *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   650
      val clause_table  = ref (Inttab.empty : int list Inttab.table)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   651
      val empty_id      = ref ~1
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   652
      (* contains a mapping from clause IDs as used by MiniSat to clause IDs in *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   653
      (* our proof format, where original clauses are numbered starting from 0  *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   654
      val clause_id_map = ref (Inttab.empty : int Inttab.table)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   655
      fun sat_to_proof id = (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   656
        case Inttab.lookup (!clause_id_map) id of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   657
          SOME id' => id'
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   658
        | NONE     => raise INVALID_PROOF ("Clause ID " ^ Int.toString id ^ " used, but not defined.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   659
      )
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   660
      val next_id = ref (number_of_clauses - 1)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   661
      (* string list -> unit *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   662
      fun process_tokens [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   663
        ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   664
        | process_tokens (tok::toks) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   665
        if tok="R" then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   666
          case toks of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   667
            id::sep::lits =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   668
            let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   669
              val _        = if !empty_id = ~1 then () else raise INVALID_PROOF "File format error: \"R\" disallowed after \"X\"."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   670
              val cid      = int_from_string id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   671
              val _        = if sep = "<=" then () else raise INVALID_PROOF ("File format error: \"<=\" expected (" ^ quote sep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   672
              val ls       = sort int_ord (map int_from_string lits)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   673
              val proof_id = case original_clause_id ls of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   674
                               SOME orig_id => orig_id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   675
                             | NONE         => raise INVALID_PROOF ("Original clause (new ID is " ^ id ^ ") not found.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   676
            in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   677
              (* extend the mapping of clause IDs with this newly defined ID *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   678
              clause_id_map := Inttab.update_new (cid, proof_id) (!clause_id_map)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   679
                handle Inttab.DUP _ => raise INVALID_PROOF ("File format error: clause " ^ id ^ " defined more than once (in \"R\").")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   680
              (* the proof itself doesn't change *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   681
            end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   682
          | _ =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   683
            raise INVALID_PROOF "File format error: \"R\" followed by an insufficient number of tokens."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   684
        ) else if tok="C" then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   685
          case toks of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   686
            id::sep::ids =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   687
            let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   688
              val _        = if !empty_id = ~1 then () else raise INVALID_PROOF "File format error: \"C\" disallowed after \"X\"."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   689
              val cid      = int_from_string id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   690
              val _        = if sep = "<=" then () else raise INVALID_PROOF ("File format error: \"<=\" expected (" ^ quote sep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   691
              (* ignore the pivot literals in MiniSat's trace *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   692
              fun unevens []             = raise INVALID_PROOF "File format error: \"C\" followed by an even number of IDs."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   693
                | unevens (x :: [])      = x :: []
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   694
                | unevens (x :: _ :: xs) = x :: unevens xs
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   695
              val rs       = (map sat_to_proof o unevens o map int_from_string) ids
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   696
              (* extend the mapping of clause IDs with this newly defined ID *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   697
              val proof_id = inc next_id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   698
              val _        = clause_id_map := Inttab.update_new (cid, proof_id) (!clause_id_map)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   699
                               handle Inttab.DUP _ => raise INVALID_PROOF ("File format error: clause " ^ id ^ " defined more than once (in \"C\").")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   700
            in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   701
              (* update clause table *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   702
              clause_table := Inttab.update_new (proof_id, rs) (!clause_table)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   703
                handle Inttab.DUP _ => raise INVALID_PROOF ("Error: internal ID for clause " ^ id ^ " already used.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   704
            end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   705
          | _ =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   706
            raise INVALID_PROOF "File format error: \"C\" followed by an insufficient number of tokens."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   707
        ) else if tok="D" then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   708
          case toks of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   709
            [id] =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   710
            let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   711
              val _ = if !empty_id = ~1 then () else raise INVALID_PROOF "File format error: \"D\" disallowed after \"X\"."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   712
              val _ = sat_to_proof (int_from_string id)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   713
            in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   714
              (* simply ignore "D" *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   715
              ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   716
            end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   717
          | _ =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   718
            raise INVALID_PROOF "File format error: \"D\" followed by an illegal number of tokens."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   719
        ) else if tok="X" then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   720
          case toks of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   721
            [id1, id2] =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   722
            let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   723
              val _            = if !empty_id = ~1 then () else raise INVALID_PROOF "File format error: more than one end-of-proof statement."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   724
              val _            = sat_to_proof (int_from_string id1)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   725
              val new_empty_id = sat_to_proof (int_from_string id2)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   726
            in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   727
              (* update conflict id *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   728
              empty_id := new_empty_id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   729
            end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   730
          | _ =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   731
            raise INVALID_PROOF "File format error: \"X\" followed by an illegal number of tokens."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   732
        ) else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   733
          raise INVALID_PROOF ("File format error: unknown token " ^ quote tok ^ " encountered.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   734
      (* string list -> unit *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   735
      fun process_lines [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   736
        ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   737
        | process_lines (l::ls) = (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   738
          process_tokens (String.tokens (fn c => c = #" " orelse c = #"\t") l);
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   739
          process_lines ls
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   740
        )
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   741
      (* proof *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   742
      val _ = process_lines proof_lines
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   743
      val _ = if !empty_id <> ~1 then () else raise INVALID_PROOF "File format error: no conflicting clause specified."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   744
    in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   745
      SatSolver.UNSATISFIABLE (SOME (!clause_table, !empty_id))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   746
    end handle INVALID_PROOF reason => (warning reason; SatSolver.UNSATISFIABLE NONE))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   747
  | result =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   748
    result
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   749
  end
20135
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   750
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   751
  SatSolver.add_solver ("minisat_with_proofs", minisat_with_proofs)
20135
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   752
end;
5a6b33268bb6 support for MiniSat proof traces added
webertj
parents: 20033
diff changeset
   753
20033
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   754
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   755
  fun minisat fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   756
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   757
    val _          = if (getenv "MINISAT_HOME") = "" then raise SatSolver.NOT_CONFIGURED else ()
29872
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   758
    val serial_str = serial_string ()
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   759
    val inpath     = File.tmp_path (Path.explode ("isabelle" ^ serial_str ^ ".cnf"))
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   760
    val outpath    = File.tmp_path (Path.explode ("result" ^ serial_str))
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   761
    val cmd        = (getenv "MINISAT_HOME") ^ "/minisat " ^ (Path.implode inpath) ^ " -r " ^ (Path.implode outpath) ^ " > /dev/null"
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   762
    fun writefn fm = SatSolver.write_dimacs_cnf_file inpath (PropLogic.defcnf fm)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   763
    fun readfn ()  = SatSolver.read_std_result_file outpath ("SAT", "", "UNSAT")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   764
    val _          = if File.exists inpath then warning ("overwriting existing file " ^ quote (Path.implode inpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   765
    val _          = if File.exists outpath then warning ("overwriting existing file " ^ quote (Path.implode outpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   766
    val result     = SatSolver.make_external_solver cmd writefn readfn fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   767
    val _          = try File.rm inpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   768
    val _          = try File.rm outpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   769
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   770
    result
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   771
  end
20033
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   772
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   773
  SatSolver.add_solver ("minisat", minisat)
20033
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   774
end;
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   775
2b8dbb637792 added support for MiniSat 1.14
webertj
parents: 19190
diff changeset
   776
(* ------------------------------------------------------------------------- *)
15332
0dc05858a862 added ZCHAFF_VERSION
webertj
parents: 15329
diff changeset
   777
(* zChaff (http://www.princeton.edu/~chaff/zchaff.html)                      *)
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   778
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   779
17493
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   780
(* ------------------------------------------------------------------------- *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   781
(* 'zchaff_with_proofs' applies the "zchaff" prover to a formula, and if     *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   782
(* zChaff finds that the formula is unsatisfiable, a proof of this is read   *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   783
(* from a file "resolve_trace" that was generated by zChaff.  See the code   *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   784
(* below for the expected format of the "resolve_trace" file.  Aside from    *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   785
(* some basic syntactic checks, no verification of the proof is performed.   *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   786
(* ------------------------------------------------------------------------- *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   787
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   788
(* add "zchaff_with_proofs" _before_ "zchaff" to the available solvers, so   *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   789
(* that the latter is preferred by the "auto" solver                         *)
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   790
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   791
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   792
  exception INVALID_PROOF of string
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   793
  fun zchaff_with_proofs fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   794
  case SatSolver.invoke_solver "zchaff" fm of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   795
    SatSolver.UNSATISFIABLE NONE =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   796
    (let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   797
      (* string list *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   798
      val proof_lines = ((split_lines o File.read) (Path.explode "resolve_trace"))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   799
        handle IO.Io _ => raise INVALID_PROOF "Could not read file \"resolve_trace\""
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   800
      (* PropLogic.prop_formula -> int *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   801
      fun cnf_number_of_clauses (PropLogic.And (fm1, fm2)) = cnf_number_of_clauses fm1 + cnf_number_of_clauses fm2
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   802
        | cnf_number_of_clauses _                          = 1
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   803
      (* string -> int *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   804
      fun int_from_string s = (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   805
        case Int.fromString s of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   806
          SOME i => i
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   807
        | NONE   => raise INVALID_PROOF ("File format error: number expected (" ^ quote s ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   808
      )
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   809
      (* parse the "resolve_trace" file *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   810
      val clause_offset = ref ~1
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   811
      val clause_table  = ref (Inttab.empty : int list Inttab.table)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   812
      val empty_id      = ref ~1
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   813
      (* string list -> unit *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   814
      fun process_tokens [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   815
        ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   816
        | process_tokens (tok::toks) =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   817
        if tok="CL:" then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   818
          case toks of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   819
            id::sep::ids =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   820
            let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   821
              val _   = if !clause_offset = ~1 then () else raise INVALID_PROOF ("File format error: \"CL:\" disallowed after \"VAR:\".")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   822
              val _   = if !empty_id = ~1 then () else raise INVALID_PROOF ("File format error: \"CL:\" disallowed after \"CONF:\".")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   823
              val cid = int_from_string id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   824
              val _   = if sep = "<=" then () else raise INVALID_PROOF ("File format error: \"<=\" expected (" ^ quote sep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   825
              val rs  = map int_from_string ids
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   826
            in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   827
              (* update clause table *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   828
              clause_table := Inttab.update_new (cid, rs) (!clause_table)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   829
                handle Inttab.DUP _ => raise INVALID_PROOF ("File format error: clause " ^ id ^ " defined more than once.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   830
            end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   831
          | _ =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   832
            raise INVALID_PROOF "File format error: \"CL:\" followed by an insufficient number of tokens."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   833
        ) else if tok="VAR:" then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   834
          case toks of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   835
            id::levsep::levid::valsep::valid::antesep::anteid::litsep::lits =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   836
            let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   837
              val _   = if !empty_id = ~1 then () else raise INVALID_PROOF ("File format error: \"VAR:\" disallowed after \"CONF:\".")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   838
              (* set 'clause_offset' to the largest used clause ID *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   839
              val _   = if !clause_offset = ~1 then clause_offset :=
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   840
                (case Inttab.max_key (!clause_table) of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   841
                  SOME id => id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   842
                | NONE    => cnf_number_of_clauses (PropLogic.defcnf fm) - 1  (* the first clause ID is 0, not 1 *))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   843
                else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   844
                  ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   845
              val vid = int_from_string id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   846
              val _   = if levsep = "L:" then () else raise INVALID_PROOF ("File format error: \"L:\" expected (" ^ quote levsep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   847
              val _   = int_from_string levid
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   848
              val _   = if valsep = "V:" then () else raise INVALID_PROOF ("File format error: \"V:\" expected (" ^ quote valsep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   849
              val _   = int_from_string valid
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   850
              val _   = if antesep = "A:" then () else raise INVALID_PROOF ("File format error: \"A:\" expected (" ^ quote antesep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   851
              val aid = int_from_string anteid
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   852
              val _   = if litsep = "Lits:" then () else raise INVALID_PROOF ("File format error: \"Lits:\" expected (" ^ quote litsep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   853
              val ls  = map int_from_string lits
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   854
              (* convert the data provided by zChaff to our resolution-style proof format *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   855
              (* each "VAR:" line defines a unit clause, the resolvents are implicitly    *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   856
              (* given by the literals in the antecedent clause                           *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   857
              (* we use the sum of '!clause_offset' and the variable ID as clause ID for the unit clause *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   858
              val cid = !clause_offset + vid
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   859
              (* the low bit of each literal gives its sign (positive/negative), therefore  *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   860
              (* we have to divide each literal by 2 to obtain the proper variable ID; then *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   861
              (* we add '!clause_offset' to obtain the ID of the corresponding unit clause  *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   862
              val vids = filter (not_equal vid) (map (fn l => l div 2) ls)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   863
              val rs   = aid :: map (fn v => !clause_offset + v) vids
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   864
            in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   865
              (* update clause table *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   866
              clause_table := Inttab.update_new (cid, rs) (!clause_table)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   867
                handle Inttab.DUP _ => raise INVALID_PROOF ("File format error: clause " ^ string_of_int cid ^ " (derived from antecedent for variable " ^ id ^ ") already defined.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   868
            end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   869
          | _ =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   870
            raise INVALID_PROOF "File format error: \"VAR:\" followed by an insufficient number of tokens."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   871
        ) else if tok="CONF:" then (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   872
          case toks of
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   873
            id::sep::ids =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   874
            let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   875
              val _   = if !empty_id = ~1 then () else raise INVALID_PROOF "File format error: more than one conflicting clause specified."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   876
              val cid = int_from_string id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   877
              val _   = if sep = "==" then () else raise INVALID_PROOF ("File format error: \"==\" expected (" ^ quote sep ^ " encountered).")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   878
              val ls  = map int_from_string ids
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   879
              (* the conflict clause must be resolved with the unit clauses *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   880
              (* for its literals to obtain the empty clause                *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   881
              val vids         = map (fn l => l div 2) ls
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   882
              val rs           = cid :: map (fn v => !clause_offset + v) vids
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   883
              val new_empty_id = getOpt (Inttab.max_key (!clause_table), !clause_offset) + 1
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   884
            in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   885
              (* update clause table and conflict id *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   886
              clause_table := Inttab.update_new (new_empty_id, rs) (!clause_table)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   887
                handle Inttab.DUP _ => raise INVALID_PROOF ("File format error: clause " ^ string_of_int new_empty_id ^ " (empty clause derived from clause " ^ id ^ ") already defined.");
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   888
              empty_id     := new_empty_id
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   889
            end
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   890
          | _ =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   891
            raise INVALID_PROOF "File format error: \"CONF:\" followed by an insufficient number of tokens."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   892
        ) else
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   893
          raise INVALID_PROOF ("File format error: unknown token " ^ quote tok ^ " encountered.")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   894
      (* string list -> unit *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   895
      fun process_lines [] =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   896
        ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   897
        | process_lines (l::ls) = (
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   898
          process_tokens (String.tokens (fn c => c = #" " orelse c = #"\t") l);
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   899
          process_lines ls
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   900
        )
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   901
      (* proof *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   902
      val _ = process_lines proof_lines
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   903
      val _ = if !empty_id <> ~1 then () else raise INVALID_PROOF "File format error: no conflicting clause specified."
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   904
    in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   905
      SatSolver.UNSATISFIABLE (SOME (!clause_table, !empty_id))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   906
    end handle INVALID_PROOF reason => (warning reason; SatSolver.UNSATISFIABLE NONE))
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   907
  | result =>
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   908
    result
17493
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   909
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   910
  SatSolver.add_solver ("zchaff_with_proofs", zchaff_with_proofs)
17493
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   911
end;
cf8713d880b1 SAT solver interface modified to support proofs of unsatisfiability
webertj
parents: 16915
diff changeset
   912
14487
157d0ea7b2da Installed solvers now determined at call time (as opposed to compile time)
webertj
parents: 14460
diff changeset
   913
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   914
  fun zchaff fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   915
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   916
    val _          = if (getenv "ZCHAFF_HOME") = "" then raise SatSolver.NOT_CONFIGURED else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   917
    val _          = if (getenv "ZCHAFF_VERSION") <> "2004.5.13" andalso
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   918
                        (getenv "ZCHAFF_VERSION") <> "2004.11.15" then raise SatSolver.NOT_CONFIGURED else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   919
      (* both versions of zChaff appear to have the same interface, so we do *)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   920
      (* not actually need to distinguish between them in the following code *)
29872
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   921
    val serial_str = serial_string ()
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   922
    val inpath     = File.tmp_path (Path.explode ("isabelle" ^ serial_str ^ ".cnf"))
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   923
    val outpath    = File.tmp_path (Path.explode ("result" ^ serial_str))
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   924
    val cmd        = (getenv "ZCHAFF_HOME") ^ "/zchaff " ^ (Path.implode inpath) ^ " > " ^ (Path.implode outpath)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   925
    fun writefn fm = SatSolver.write_dimacs_cnf_file inpath (PropLogic.defcnf fm)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   926
    fun readfn ()  = SatSolver.read_std_result_file outpath ("Instance Satisfiable", "", "Instance Unsatisfiable")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   927
    val _          = if File.exists inpath then warning ("overwriting existing file " ^ quote (Path.implode inpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   928
    val _          = if File.exists outpath then warning ("overwriting existing file " ^ quote (Path.implode outpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   929
    val result     = SatSolver.make_external_solver cmd writefn readfn fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   930
    val _          = try File.rm inpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   931
    val _          = try File.rm outpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   932
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   933
    result
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   934
  end
14487
157d0ea7b2da Installed solvers now determined at call time (as opposed to compile time)
webertj
parents: 14460
diff changeset
   935
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   936
  SatSolver.add_solver ("zchaff", zchaff)
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   937
end;
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   938
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   939
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   940
(* BerkMin 561 (http://eigold.tripod.com/BerkMin.html)                       *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   941
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   942
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   943
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   944
  fun berkmin fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   945
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   946
    val _          = if (getenv "BERKMIN_HOME") = "" orelse (getenv "BERKMIN_EXE") = "" then raise SatSolver.NOT_CONFIGURED else ()
29872
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   947
    val serial_str = serial_string ()
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   948
    val inpath     = File.tmp_path (Path.explode ("isabelle" ^ serial_str ^ ".cnf"))
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   949
    val outpath    = File.tmp_path (Path.explode ("result" ^ serial_str))
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   950
    val cmd        = (getenv "BERKMIN_HOME") ^ "/" ^ (getenv "BERKMIN_EXE") ^ " " ^ (Path.implode inpath) ^ " > " ^ (Path.implode outpath)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   951
    fun writefn fm = SatSolver.write_dimacs_cnf_file inpath (PropLogic.defcnf fm)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   952
    fun readfn ()  = SatSolver.read_std_result_file outpath ("Satisfiable          !!", "solution =", "UNSATISFIABLE          !!")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   953
    val _          = if File.exists inpath then warning ("overwriting existing file " ^ quote (Path.implode inpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   954
    val _          = if File.exists outpath then warning ("overwriting existing file " ^ quote (Path.implode outpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   955
    val result     = SatSolver.make_external_solver cmd writefn readfn fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   956
    val _          = try File.rm inpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   957
    val _          = try File.rm outpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   958
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   959
    result
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   960
  end
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   961
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   962
  SatSolver.add_solver ("berkmin", berkmin)
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   963
end;
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   964
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   965
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   966
(* Jerusat 1.3 (http://www.cs.tau.ac.il/~ale1/)                              *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   967
(* ------------------------------------------------------------------------- *)
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   968
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   969
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   970
  fun jerusat fm =
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   971
  let
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   972
    val _          = if (getenv "JERUSAT_HOME") = "" then raise SatSolver.NOT_CONFIGURED else ()
29872
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   973
    val serial_str = serial_string ()
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   974
    val inpath     = File.tmp_path (Path.explode ("isabelle" ^ serial_str ^ ".cnf"))
14e208d607af Added serial_string to SAT solver input and output files, to prevent multithreading chaos.
blanchet
parents: 22567
diff changeset
   975
    val outpath    = File.tmp_path (Path.explode ("result" ^ serial_str))
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   976
    val cmd        = (getenv "JERUSAT_HOME") ^ "/Jerusat1.3 " ^ (Path.implode inpath) ^ " > " ^ (Path.implode outpath)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   977
    fun writefn fm = SatSolver.write_dimacs_cnf_file inpath (PropLogic.defcnf fm)
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   978
    fun readfn ()  = SatSolver.read_std_result_file outpath ("s SATISFIABLE", "v ", "s UNSATISFIABLE")
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   979
    val _          = if File.exists inpath then warning ("overwriting existing file " ^ quote (Path.implode inpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   980
    val _          = if File.exists outpath then warning ("overwriting existing file " ^ quote (Path.implode outpath)) else ()
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   981
    val result     = SatSolver.make_external_solver cmd writefn readfn fm
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   982
    val _          = try File.rm inpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   983
    val _          = try File.rm outpath
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   984
  in
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   985
    result
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   986
  end
14965
7155b319eafa new SAT solver interface
webertj
parents: 14805
diff changeset
   987
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   988
  SatSolver.add_solver ("jerusat", jerusat)
14487
157d0ea7b2da Installed solvers now determined at call time (as opposed to compile time)
webertj
parents: 14460
diff changeset
   989
end;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   990
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   991
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   992
(* Add code for other SAT solvers below.                                     *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   993
(* ------------------------------------------------------------------------- *)
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   994
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
   995
(*
14487
157d0ea7b2da Installed solvers now determined at call time (as opposed to compile time)
webertj
parents: 14460
diff changeset
   996
let
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   997
  fun mysolver fm = ...
14487
157d0ea7b2da Installed solvers now determined at call time (as opposed to compile time)
webertj
parents: 14460
diff changeset
   998
in
22567
1565d476a9e2 removed assert/deny (avoid clash with Alice keywords and confusion due to strict evaluation);
wenzelm
parents: 22220
diff changeset
   999
  SatSolver.add_solver ("myname", (fn fm => if mysolver_is_configured then mysolver fm else raise SatSolver.NOT_CONFIGURED));  -- register the solver
14487
157d0ea7b2da Installed solvers now determined at call time (as opposed to compile time)
webertj
parents: 14460
diff changeset
  1000
end;
14453
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
  1001
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
  1002
-- the solver is now available as SatSolver.invoke_solver "myname"
3397a69dfa4e Internal and external SAT solvers
webertj
parents:
diff changeset
  1003
*)