void
ndfs_blue_handle (void *arg, state_info_t *successor, transition_info_t *ti,
int seen)
{
wctx_t *ctx = (wctx_t *) arg;
alg_local_t *loc = ctx->local;
nndfs_color_t color = nn_get_color (&loc->color_map, successor->ref);
if (proviso == Proviso_Stack)
ti->por_proviso = !nn_color_eq(color, NNCYAN);
/**
* The following lines bear little resemblance to the algorithms in the
* respective papers (NNDFS / LNDFS), but we must store all non-red states
* on the stack here, in order to calculate all-red correctly later.
*/
if ( ecd && nn_color_eq(color, NNCYAN) &&
(GBbuchiIsAccepting(ctx->model, state_info_state(ctx->state)) ||
GBbuchiIsAccepting(ctx->model, state_info_state(successor))) ) {
/* Found cycle in blue search */
ndfs_report_cycle (ctx->run, ctx->model, loc->stack, successor);
} else if ((loc->strat == Strat_LNDFS && !state_store_has_color(ctx->state->ref, GRED, loc->rec_bits)) ||
(loc->strat != Strat_LNDFS && !nn_color_eq(color, NNPINK))) {
raw_data_t stack_loc = dfs_stack_push (loc->stack, NULL);
state_info_serialize (successor, stack_loc);
}
(void) ti; (void) seen;
}
static void
endfs_handle_red (void *arg, state_info_t *successor, transition_info_t *ti, int seen)
{
wctx_t *ctx = (wctx_t *) arg;
alg_local_t *loc = ctx->local;
cndfs_alg_local_t *cloc = (cndfs_alg_local_t *) ctx->local;
int onstack;
/* Find cycle back to the seed */
HREassert (cloc->accepting_depth > 0);
size_t *level;
onstack = ctx->state->ref == loc->seed->ref;
if (!onstack) {
onstack = fset_find (cloc->pink, NULL, &successor->ref, (void**)&level, false);
HREassert (onstack != FSET_FULL);
}
if ( onstack && *level < cloc->accepting_depth )
ndfs_report_cycle (ctx, ctx->model, loc->stack, successor);
/* Mark states dangerous if necessary */
if ( Strat_ENDFS == loc->strat &&
pins_state_is_accepting(ctx->model, state_info_state(successor)) &&
state_store_get_colors (successor->ref) != CRED )
state_store_try_color(successor->ref, GDANGEROUS, loc->rec_bits);
if ( !onstack && state_store_get_colors (successor->ref) != CRED ) {
raw_data_t stack_loc = dfs_stack_push (loc->stack, NULL);
state_info_serialize (successor, stack_loc);
}
// check proviso
if (PINS_POR && proviso == Proviso_CNDFS && cloc->successors == NONEC) {
if (ti->por_proviso != 0) { // state already fully expanded
cloc->successors = SRCINV;
} else if (onstack) { // cycle check
if (onstack) cloc->successors = CYCLE;
}
// avoid full exploration (proviso is enforced later in backtrack)
ti->por_proviso = 1; // avoid full exploration
}
(void) seen;
}
static void
ndfs_red_handle (void *arg, state_info_t *successor, transition_info_t *ti,
int seen)
{
wctx_t *ctx = (wctx_t *) arg;
alg_local_t *loc = ctx->local;
nndfs_color_t color = nn_get_color(&loc->color_map, successor->ref);
ti->por_proviso = 1; // only visit blue states to stay in reduced search space
if (proviso != Proviso_None && !nn_color_eq(color, NNBLUE))
return; // only revisit blue states to determinize POR
if ( nn_color_eq(color, NNCYAN) ) {
/* Found cycle back to the stack */
ndfs_report_cycle (ctx->run, ctx->model, loc->stack, successor);
} else if ( nn_color_eq(color, NNBLUE) && (loc->strat != Strat_LNDFS ||
!state_store_has_color(ctx->state->ref, GRED, loc->rec_bits)) ) {
raw_data_t stack_loc = dfs_stack_push (loc->stack, NULL);
state_info_serialize (successor, stack_loc);
}
(void) ti; (void) seen;
}
static void
endfs_handle_blue (void *arg, state_info_t *successor, transition_info_t *ti, int seen)
{
wctx_t *ctx = (wctx_t *) arg;
alg_local_t *loc = ctx->local;
cndfs_alg_local_t *cloc = (cndfs_alg_local_t *) ctx->local;
size_t *level;
int onstack = fset_find (cloc->pink, NULL, &successor->ref, (void**)&level, false);
HREassert (onstack != FSET_FULL);
/**
* The following lines bear little resemblance to the algorithms in the
* respective papers (Evangelista et al./ Laarman et al.), but we must
* store all non-red states on the stack in order to calculate
* all-red correctly later. Red states are also stored as optimization.
*/
if ( ecd && onstack && *level < cloc->accepting_depth) {
/* Found cycle in blue search */
ndfs_report_cycle (ctx, ctx->model, loc->stack, successor);
} else if ( all_red || (!onstack &&
state_store_get_colors (successor->ref) != CBLUE) ) {
raw_data_t stack_loc = dfs_stack_push (loc->stack, NULL);
state_info_serialize (successor, stack_loc);
}
// check proviso
if (PINS_POR && proviso == Proviso_CNDFS && cloc->successors == NONEC) {
if (ti->por_proviso != 0) { // state already fully expanded
cloc->successors = SRCINV;
} else if (onstack) { // check cycle
cloc->successors = CYCLE;
}
// avoid full exploration (proviso is enforced later in backtrack)
ti->por_proviso = 1;
}
(void) seen;
}