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hflmc2's Issues

Fpat cannot solve HCCS

Input

%HES
S n         =v Twice n Neg (Eq n).
Twice m f k =v f m (F m f k).
F m f k l   =v f l k.
Neg a h     =v h (- a).
Eq c d      =v c = d.

Output:

Fpat.BwIPHCCSSolver.solve
- Raise Unknown
Fpat.(GenHCCSSolver.solve (CHGenInterpProver.interpolate b))
- Raise NoSolution

Fpat.FwHCCSSolver.solve_simp gives me a solution but this solver is not so good at finding proper predicates.

Following HCCS is generated by hflmc2:

  _|_
    <= P[S:0](n), n = n
  P[S:0](n)
    <= P[Twice](m), m = n
  P[Twice](m)
    <= P[f1](m, x1), x1 = m
  P[f1](m, x1)
    <= P[Neg1](a1), m = n, x1 = m, a1 = x1
  P[Neg1](a1)
    <= P[h1:0](a1, b1), b1 = 0 - a1
  P[h1:0](a1, b1)
    <= P[g1:0](m, x1, y1),
       a1 = x1, m = n, x1 = m, b1 = 0 - a1, y1 = b1
  P[g1:0](m, x1, y1)
    <= P[F](m_, l_),
       x1 = m, x1 = m && y1 = 0 - x1, m_ = m, l_ = y1
  P[F](m_, l_)
    <= P[f_:0](m_, x_), x_ = l_
  P[f_:0](m_, x_)
    <= P[f2](m, x2),
       m_ = m, x1 = m, x1 = m && y1 = 0 - x1, x2 = x_
  P[f2](m, x2)
    <= P[Neg2](a2), m = n, a2 = x2
  P[Neg2](a2)
    <= P[h2:0](a2, b2), b2 = 0 - a2
  P[h2:0](a2, b2)
    <= P[g2:0](m, x2, y2),
       a2 = x2, m = n, b2 = 0 - a2, y2 = b2
  P[g2:0](m, x2, y2)
    <= P[g_:0](m_, x_, y_),
       x2 = x_, m_ = m, x1 = m, x1 = m && y1 = 0 - x1, y2 = 0 - x2, y_ = y2
  P[g_:0](m_, x_, y_)
    <= P[k_:0](m_, z_), x_ = l_, z_ = y_
  P[k_:0](m_, z_)
    <= P[k:0](m, z),
       m_ = m, x1 = m, x1 = m && y1 = 0 - x1, z = z_
  P[k:0](m, z)
    <= P[Eq](c, d), m = n, c = n, d = z
  P[Eq](c, d)
    <= c /= d

Assert failure in hflmc2_refine.ml

Input:

%HES
Sentry  =ν exi_x196 < 1 || Exists exi_x196.
Exists exi_x217 =ν
  (exi_r278 < 1
    || exi_r278 < 1 * exi_x217 || exi_r278 < -1 * exi_x217 || F_0_ff_ap_ exi_x217 exi_r278
    || exi_r279 < 1
      || exi_r279 < 1 * -exi_x217 || exi_r279 < -1 * -exi_x217 || F_0_ff_ap_ (-exi_x217) exi_r279
      || Exists (exi_x217 - 1))
  && exi_x217 >= 0.
F_0_tt x2210 =ν
  exi_r2311 < 1 || exi_r2311 < 1 * x2210 || exi_r2311 < -1 * x2210 || F_0_tt_ap_ x2210 exi_r2311.
F_0_tt_ap_ x2412 exi_r2513 =ν
  ((x2412 >= 0
    && rec_G_1_ff_13214 < 1 + 1 * exi_r2513
        || rec_G_1_ff_13214 < 1 + -1 * exi_r2513
          || rec_G_1_ff_13214 < 1 + 1 * (x2412 - 1)
              || rec_G_1_ff_13214 < 1 + -1 * (x2412 - 1)
                || rec_G_1_ff_13214 < 1 || G_1_ff_1 rec_G_1_ff_13214 (x2412 - 1) exi_r2513
    || x2412 < 0 && exi_r2513 = 5)
    && F_0_tt exi_r2513
    || (x2412 >= 0
        && rec_G_1_ff_13215 < 1 + 1 * -exi_r2513
          || rec_G_1_ff_13215 < 1 + -1 * -exi_r2513
              || rec_G_1_ff_13215 < 1 + 1 * (x2412 - 1)
                || rec_G_1_ff_13215 < 1 + -1 * (x2412 - 1)
                    || rec_G_1_ff_13215 < 1 || G_1_ff_1 rec_G_1_ff_13215 (x2412 - 1) (-exi_r2513)
        || x2412 < 0 && -exi_r2513 = 5)
      && F_0_tt (-exi_r2513)
      || F_0_tt_ap_ x2412 (exi_r2513 - 1))
  && exi_r2513 >= 0.
F_0_ff_ap_ x2816 exi_r2917 =ν
  ((x2816 >= 0
    && rec_G_1_ff_13218 < 1 + 1 * exi_r2917
        || rec_G_1_ff_13218 < 1 + -1 * exi_r2917
          || rec_G_1_ff_13218 < 1 + 1 * (x2816 - 1)
              || rec_G_1_ff_13218 < 1 + -1 * (x2816 - 1)
                || rec_G_1_ff_13218 < 1 || G_1_ff_1 rec_G_1_ff_13218 (x2816 - 1) exi_r2917
    || x2816 < 0 && exi_r2917 = 5)
    && F_0_tt exi_r2917
    || (x2816 >= 0
        && rec_G_1_ff_13219 < 1 + 1 * -exi_r2917
          || rec_G_1_ff_13219 < 1 + -1 * -exi_r2917
              || rec_G_1_ff_13219 < 1 + 1 * (x2816 - 1)
                || rec_G_1_ff_13219 < 1 + -1 * (x2816 - 1)
                    || rec_G_1_ff_13219 < 1 || G_1_ff_1 rec_G_1_ff_13219 (x2816 - 1) (-exi_r2917)
        || x2816 < 0 && -exi_r2917 = 5)
      && F_0_tt (-exi_r2917)
      || F_0_ff_ap_ x2816 (exi_r2917 - 1))
  && exi_r2917 >= 0.
G_1_ff_1 rec_G_1_ff_13320 x3421 r3522 =ν
  rec_G_1_ff_13320 > 0
  && (x3421 >= 0 && G_1_ff_1 (rec_G_1_ff_13320 - 1) (x3421 - 1) r3522 || x3421 < 0 && r3522 = 5).

Running hflmc2 input.hes gives me the error below:

Uncaught exception:
  
  "Assert_failure lib/refine/hflmc2_refine.ml:408:34"

Raised at file "lib/refine/hflmc2_refine.ml", line 408, characters 34-46
Called from file "src/list.ml", line 325, characters 13-17
Called from file "src/list.ml", line 557, characters 34-40
Called from file "lib/refine/hflmc2_refine.ml", line 405, characters 22-275
Called from file "lib/refine/hflmc2_refine.ml", line 340, characters 16-46
Called from file "lib/refine/hflmc2_refine.ml", line 340, characters 16-46
Called from file "lib/refine/hflmc2_refine.ml", line 340, characters 16-46
Called from file "lib/refine/hflmc2_refine.ml", line 353, characters 51-81
Called from file "lib/refine/hflmc2_refine.ml", line 369, characters 31-44
Called from file "lib/refine/hflmc2_refine.ml", line 12, characters 10-14
Called from file "lib/refine/traceVar.ml", line 67, characters 10-14
Called from file "lib/refine/hflmc2_refine.ml", line 350, characters 20-1023
Called from file "lib/refine/hflmc2_refine.ml", line 340, characters 16-46
Called from file "lib/refine/hflmc2_refine.ml", line 340, characters 16-46
Called from file "lib/refine/hflmc2_refine.ml", line 340, characters 16-46
Called from file "lib/refine/hflmc2_refine.ml", line 568, characters 18-76
Called from file "lib/refine/hflmc2_refine.ml", line 340, characters 16-46
Called from file "lib/refine/hflmc2_refine.ml", line 568, characters 18-76
Called from file "lib/refine/hflmc2_refine.ml", line 590, characters 11-58
Called from file "lib/refine/hflmc2_refine.ml", line 606, characters 39-57
Called from file "lib/hflmc2.ml", line 28, characters 15-19
Called from file "lib/hflmc2.ml", line 40, characters 16-30
Called from file "lib/hflmc2.ml", line 146, characters 24-101
Called from file "lib/hflmc2.ml", line 177, characters 4-52
Called from file "bin/main.ml", line 14, characters 16-32

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