polytope_scan.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <assert.h>
  11 #include "isl_equalities.h"
  12 #include "isl_seq.h"
  13 #include "isl_scan.h"
  14
  15 /* The input of this program is the same as that of the "polytope_scan"
  16  * program from the barvinok distribution.
  17  *
  18  * Constraints of set is PolyLib format.
  19  *
  20  * The input set is assumed to be bounded.
  21  */
  22
  23 struct scan_samples {
  24         struct isl_scan_callback callback;
  25         struct isl_mat *samples;
  26 };
  27
  28 static int scan_samples_add_sample(struct isl_scan_callback *cb,
  29         __isl_take isl_vec *sample)
  30 {
  31         struct scan_samples *ss = (struct scan_samples *)cb;
  32
  33         ss->samples = isl_mat_extend(ss->samples, ss->samples->n_row + 1,
  34                                                   ss->samples->n_col);
  35         if (!ss->samples)
  36                 goto error;
  37
  38         isl_seq_cpy(ss->samples->row[ss->samples->n_row - 1],
  39                     sample->el, sample->size);
  40
  41         isl_vec_free(sample);
  42         return 0;
  43 error:
  44         isl_vec_free(sample);
  45         return -1;
  46 }
  47
  48 static struct isl_mat *isl_basic_set_scan_samples(struct isl_basic_set *bset)
  49 {
  50         unsigned dim;
  51         struct scan_samples ss;
  52
  53         dim = isl_basic_set_total_dim(bset);
  54         ss.callback.add = scan_samples_add_sample;
  55         ss.samples = isl_mat_alloc(bset->ctx, 0, 1 + dim);
  56         if (!ss.samples)
  57                 goto error;
  58
  59         if (isl_basic_set_scan(bset, &ss.callback) < 0) {
  60                 isl_mat_free(ss.samples);
  61                 return NULL;
  62         }
  63
  64         return ss.samples;
  65 error:
  66         isl_basic_set_free(bset);
  67         return NULL;
  68 }
  69
  70 static struct isl_mat *isl_basic_set_samples(struct isl_basic_set *bset)
  71 {
  72         struct isl_mat *T;
  73         struct isl_mat *samples;
  74
  75         if (bset->n_eq == 0)
  76                 return isl_basic_set_scan_samples(bset);
  77
  78         bset = isl_basic_set_remove_equalities(bset, &T, NULL);
  79         samples = isl_basic_set_scan_samples(bset);
  80         return isl_mat_product(samples, isl_mat_transpose(T));
  81 }
  82
  83 int main(int argc, char **argv)
  84 {
  85         struct isl_ctx *ctx = isl_ctx_alloc();
  86         struct isl_basic_set *bset;
  87         struct isl_mat *samples;
  88
  89         bset = isl_basic_set_read_from_file(ctx, stdin, 0);
  90         samples = isl_basic_set_samples(bset);
  91         isl_mat_dump(samples, stdout, 0);
  92         isl_mat_free(samples);
  93         isl_ctx_free(ctx);
  94
  95         return 0;
  96 }