- More refactoring for Arachne. Slowly we're getting somewhere.
This commit is contained in:
ccremers
parent
e592a0a432
commit
a5acc4984a
637
src/arachne.c
637
src/arachne.c
@ -506,57 +506,6 @@ get_semitrace_length ()
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return length;
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}
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//! Check whether a binding (goal) is selectable
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int
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is_goal_selectable (const Binding b)
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{
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if (b != NULL)
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{
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if (!b->blocked && !b->done)
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{
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return 1;
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}
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}
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return 0;
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}
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//! Count selectable goals
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int
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count_selectable_goals ()
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{
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List bl;
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int n;
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n = 0;
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bl = sys->bindings;
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while (bl != NULL)
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{
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Binding b;
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b = (Binding) bl->data;
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if (is_goal_selectable (b))
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{
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n++;
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}
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bl = bl->next;
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}
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return n;
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}
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//! Return first selectable goal in the list
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/**
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* The return list entry is either NULL, or a selectable goal.
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*/
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List
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first_selectable_goal (List bl)
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{
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while (bl != NULL && !is_goal_selectable ((Binding) bl->data))
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{
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bl = bl->next;
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}
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return bl;
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}
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//! Count intruder events
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int
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countIntruderActions ()
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@ -1385,162 +1334,6 @@ iterate_outgoing_arrows (void (*func) (), const int run, const int ev)
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}
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}
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//! Display the current semistate using LaTeX output format.
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/**
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* This is not as nice as we would like it. Furthermore, the function is too big, and needs to be split into functional parts that
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* will allow the generation of dot code as well.
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*/
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void
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latexSemiState ()
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{
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static int attack_number = 0;
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int run;
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Protocol p;
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int *ranks;
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int maxrank, maxline;
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// Open graph
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attack_number++;
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eprintf ("\\begin{msc}{Attack on ");
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p = (Protocol) sys->current_claim->protocol;
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termPrint (p->nameterm);
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eprintf (", role ");
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termPrint (sys->current_claim->rolename);
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eprintf (", claim type ");
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termPrint (sys->current_claim->type);
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eprintf ("}\n%% Attack number %i\n", attack_number);
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eprintf ("\n");
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// Needed for the bindings later on: create graph
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goal_graph_create (); // create graph
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if (warshall (graph, nodes) == 0) // determine closure
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{
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eprintf
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("%% This graph was not completely closed transitively because it contains a cycle!\n");
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}
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ranks = memAlloc (nodes * sizeof (int));
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maxrank = graph_ranks (graph, ranks, nodes); // determine ranks
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// Convert ranks to lines
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maxline = ranks_to_lines (ranks, nodes);
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// Draw headings (boxes)
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run = 0;
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while (run < sys->maxruns)
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{
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if (sys->runs[run].protocol != INTRUDER)
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{
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eprintf ("\\declinst{r%i}{}{run %i}\n", run, run);
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}
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run++;
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}
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eprintf ("\\nextlevel\n\n");
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// Draw all events (according to ranks)
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{
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int myline;
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myline = 0;
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while (myline < maxline)
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{
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int count;
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int run;
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count = 0;
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run = 0;
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while (run < sys->maxruns)
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{
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if (sys->runs[run].protocol != INTRUDER)
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{
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int ev;
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ev = 0;
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while (ev < sys->runs[run].step)
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{
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if (myline == ranks[node_number (run, ev)])
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{
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Roledef rd;
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void outgoing_arrow (const int run2, const int ev2)
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{
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Roledef rd2;
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int delta;
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rd2 = roledef_shift (sys->runs[run2].start, ev2);
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eprintf ("\\mess{");
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/*
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// Print the term
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// Maybe, if more than one outgoing, and different send/reads, we might want to change this a bit.
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if (rd->type == SEND)
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{
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if (rd2->type == CLAIM)
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{
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roledefPrint(rd);
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}
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if (rd2->type == READ)
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{
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eprintf("$");
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if (isTermEqual(rd->message, rd2->message))
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{
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termPrint(rd->message);
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}
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else
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{
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termPrint(rd->message);
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eprintf(" \\longrightarrow ");
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termPrint(rd2->message);
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}
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eprintf("$");
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}
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}
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else
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{
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roledefPrint(rd);
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}
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*/
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/*
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roledefPrint (rd);
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eprintf (" $\\longrightarrow$ ");
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roledefPrint (rd2);
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*/
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eprintf ("}{r%i}{r%i}", run, run2);
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delta = ranks[node_number (run2, ev2)] - myline;
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if (delta != 0)
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{
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eprintf ("[%i]", delta);
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}
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eprintf ("\n");
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count++;
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}
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// We have found an event on this line
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// We only need to consider reads and claims, but for fun we just consider everything.
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rd = roledef_shift (sys->runs[run].start, ev);
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iterate_outgoing_arrows (outgoing_arrow, run, ev);
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eprintf ("\\action{");
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roledefPrint (rd);
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eprintf ("}{r%i}\n", run);
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}
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ev++;
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}
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}
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run++;
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}
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eprintf ("\\nextlevel\n");
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myline++;
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}
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}
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// clean memory
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memFree (ranks, nodes * sizeof (int)); // ranks
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// close graph
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eprintf ("\\nextlevel\n\\end{msc}\n\n");
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}
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//! Print the current semistate
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void
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printSemiState ()
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@ -1613,392 +1406,6 @@ printSemiState ()
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eprintf ("!! - open: %i -\n", open);
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}
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//! Give an indication of the amount of consequences binding a term has
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/**
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* Given a term, returns a float. 0: maximum consequences, 1: no consequences.
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*/
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float
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termBindConsequences (Term t)
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{
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Termlist openVariables;
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openVariables = termlistAddVariables (NULL, t);
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if (openVariables == NULL)
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{
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// No variables, no consequences
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return 1;
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}
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else
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{
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// For each run event in the semitrace, check whether it contains any
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// of the open variables.
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int totalCount;
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int affectedCount;
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int run;
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totalCount = 0;
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affectedCount = 0;
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run = 0;
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while (run < sys->maxruns)
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{
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Roledef rd;
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int step;
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rd = sys->runs[run].start;
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step = 0;
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while (step < sys->runs[run].length)
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{
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Termlist tl;
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tl = openVariables;
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while (tl != NULL)
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{
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if ((rd->type == READ || rd->type == SEND)
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&& termSubTerm (rd->message, tl->term))
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{
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// This run event contains the open variable
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affectedCount++;
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tl = NULL;
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}
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else
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{
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tl = tl->next;
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}
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}
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totalCount++;
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step++;
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rd = rd->next;
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}
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run++;
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}
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termlistDelete (openVariables);
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if (totalCount > 0)
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{
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// Valid computation
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return (float) (totalCount - affectedCount) / totalCount;
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}
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else
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{
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// No consequences, ensure no division by 0
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return 1;
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}
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}
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}
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//! Determine whether a term is an open nonce variable
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/**
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* Does not explore subterms
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*/
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int
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isOpenNonceVar (Term t)
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{
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t = deVar (t);
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if (realTermVariable (t))
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{
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return inTermlist (t->stype, TERM_Nonce);
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}
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else
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{
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return 0;
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}
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}
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//! Count unique open variables in term
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/**
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*/
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int
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count_open_variables (const Term t)
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{
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Termlist tl;
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int n;
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tl = NULL;
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termlistAddVariables (tl, t);
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n = 0;
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while (tl != NULL)
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{
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if (!inTermlist (tl->next, t))
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{
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if (isOpenNonceVar (t))
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{
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n = n + 1;
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}
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}
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tl = tl->next;
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}
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termlistDelete (tl);
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return n;
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}
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//! Athena-like factor
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/**
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* Lower is better (more nonce variables)
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*/
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float
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term_noncevariables_level (const Term t)
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{
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int onv;
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const int enough = 2;
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onv = count_open_variables (t);
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if (onv >= enough)
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{
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return 0;
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}
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else
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{
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return 1 - (onv / enough);
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}
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}
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//------------------------------------------------------------------------
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// Larger logical componentents
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//------------------------------------------------------------------------
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//! Selector to select the first tuple goal.
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/**
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* Basically to get rid of -m2 tuple goals.
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* Nice iteration, I'd suppose
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*/
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Binding
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select_tuple_goal ()
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{
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List bl;
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Binding tuplegoal;
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bl = sys->bindings;
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tuplegoal = NULL;
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while (bl != NULL && tuplegoal == NULL)
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{
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Binding b;
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b = (Binding) bl->data;
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// Ignore done stuff
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if (!b->blocked && !b->done)
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{
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if (isTermTuple (b->term))
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{
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tuplegoal = b;
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}
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}
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bl = bl->next;
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}
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return tuplegoal;
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}
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//! Goal selection
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/**
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* Selects the most constrained goal.
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*
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* First selection is on level; thus, keys are selected first.
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*
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* Because the list starts with the newest terms, and we use <= (as opposed to <), we
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* ensure that for goals with equal constraint levels, we select the oldest one.
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*
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* --select-goal has two distint interpretations. If it is 0 or greater, it a
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* selection mask. If it is smaller than 0, it is some special tactic.
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*
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* selection masks for --select-goal
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* 1: constrain level of term
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* 2: key or not
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* 4: consequences determination
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* 8: select also single variables (that are not role variables)
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* 16: single variables are better
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*
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* special tactics for --select-goal
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* -1: random goal selection
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*
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*/
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Binding
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select_goal_masked ()
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{
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List bl;
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Binding best;
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float min_constrain;
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int mode;
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// mode bits local storage
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mode = switches.arachneSelector;
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// Find the most constrained goal
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if (switches.output == PROOF)
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{
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indentPrint ();
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eprintf ("Listing open goals that might be chosen: ");
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}
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min_constrain = FLT_MAX;
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bl = sys->bindings;
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best = NULL;
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while (bl != NULL)
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{
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Binding b;
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b = (Binding) bl->data;
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// Only if not done and not blocked
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if (is_goal_selectable (b))
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{
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int allow;
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Term gterm;
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allow = 0;
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gterm = deVar (b->term);
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if (mode & 8)
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{
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// check for singular variable
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if (realTermVariable (gterm))
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{
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// singular variable only if it is not a role name variable
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allow = !gterm->roleVar;
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}
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else
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{
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// not a singular variable, allow
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allow = 1;
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}
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}
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else
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{
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// Normally (mode & 8 == 0) we ignore any singular variables
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allow = !realTermVariable (gterm);
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}
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if (allow)
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{
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float buf_constrain;
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int buf_weight;
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int smode;
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void adapt (const int w, const float fl)
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{
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buf_constrain = buf_constrain + w * fl;
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buf_weight = buf_weight + w;
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}
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void erode (const int w, const float fl)
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{
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if (smode & 1)
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{
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adapt (w, fl);
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}
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smode = smode / 2;
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}
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// buf_constrain is the addition of the factors before division by weight
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buf_constrain = 0;
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buf_weight = 0;
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if (switches.output == PROOF && best != NULL)
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eprintf (", ");
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// We will shift this mode variable
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smode = mode;
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// Determine buf_constrain levels
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// Bit 0: 1 constrain level
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erode (1, term_constrain_level (b->term));
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// Bit 1: 2 key level (inverted)
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erode (1, 0.5 * (1 - b->level));
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// Bit 2: 4 consequence level
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erode (1, termBindConsequences (b->term));
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// Bit 3: 8 single variables first
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erode (1, 1 - isTermVariable (b->term));
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// Bit 4: 16 nonce variables level (Cf. what I think is in Athena)
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erode (1, term_noncevariables_level (b->term));
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// Define legal range
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if (smode > 0)
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error ("--goal-select mode %i is illegal", mode);
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// Weigh result
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if (buf_weight == 0 || buf_constrain <= min_constrain)
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{
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min_constrain = buf_constrain;
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best = b;
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if (switches.output == PROOF)
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eprintf ("*");
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}
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if (switches.output == PROOF)
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{
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termPrint (b->term);
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if (mode & 2)
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{
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eprintf ("[%i]", b->level);
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}
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eprintf ("<%.2f>", buf_constrain);
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}
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}
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}
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bl = bl->next;
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}
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if (switches.output == PROOF)
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{
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if (best == NULL)
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eprintf ("none");
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eprintf ("\n");
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}
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return best;
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}
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//! Goal selection special case -1: random
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/**
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* Simply picks an open goal randomly. Has to be careful to skip singular stuff etc.
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*/
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Binding
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select_goal_random ()
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{
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int n;
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n = count_selectable_goals ();
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if (n > 0)
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{
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int choice;
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List bl;
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// Choose a random goal between 0 and n
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choice = rand () % n;
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// Fetch it
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bl = sys->bindings;
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while (choice >= 0)
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{
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bl = first_selectable_goal (bl);
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if (bl == NULL)
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{
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error ("Random chooser selected a NULL goal.");
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}
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choice--;
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}
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return (Binding) bl->data;
|
||||
}
|
||||
else
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
//! Goal selection function, generic
|
||||
Binding
|
||||
select_goal ()
|
||||
{
|
||||
if (switches.arachneSelector >= 0)
|
||||
{
|
||||
// Masked
|
||||
return select_goal_masked ();
|
||||
}
|
||||
else
|
||||
{
|
||||
// Special cases
|
||||
switch (switches.arachneSelector)
|
||||
{
|
||||
case -1:
|
||||
return select_goal_random ();
|
||||
break;
|
||||
}
|
||||
error ("Unknown value (<0) for --goal-select.");
|
||||
}
|
||||
}
|
||||
|
||||
//! Check if a binding duplicates an old one: if so, simply connect
|
||||
int
|
||||
bind_old_goal (const Binding b_new)
|
||||
@ -2825,14 +2232,7 @@ arachneOutputAttack ()
|
||||
}
|
||||
else
|
||||
{
|
||||
if (switches.latex == 1)
|
||||
{
|
||||
latexSemiState ();
|
||||
}
|
||||
else
|
||||
{
|
||||
dotSemiState (sys);
|
||||
}
|
||||
dotSemiState (sys);
|
||||
}
|
||||
|
||||
// End wrapper
|
||||
@ -2883,6 +2283,39 @@ property_check ()
|
||||
return flag;
|
||||
}
|
||||
|
||||
|
||||
//! Selector to select the first tuple goal.
|
||||
/**
|
||||
* Basically to get rid of -m2 tuple goals.
|
||||
* Nice iteration, I'd suppose
|
||||
*/
|
||||
Binding
|
||||
select_tuple_goal ()
|
||||
{
|
||||
List bl;
|
||||
Binding tuplegoal;
|
||||
|
||||
bl = sys->bindings;
|
||||
tuplegoal = NULL;
|
||||
while (bl != NULL && tuplegoal == NULL)
|
||||
{
|
||||
Binding b;
|
||||
|
||||
b = (Binding) bl->data;
|
||||
// Ignore done stuff
|
||||
if (!b->blocked && !b->done)
|
||||
{
|
||||
if (isTermTuple (b->term))
|
||||
{
|
||||
tuplegoal = b;
|
||||
}
|
||||
}
|
||||
bl = bl->next;
|
||||
}
|
||||
return tuplegoal;
|
||||
}
|
||||
|
||||
|
||||
//! Main recursive procedure for Arachne
|
||||
int
|
||||
iterate ()
|
||||
@ -2942,7 +2375,7 @@ iterate ()
|
||||
* Check whether its a final state (i.e. all goals bound)
|
||||
*/
|
||||
|
||||
b = select_goal ();
|
||||
b = select_goal (sys);
|
||||
if (b == NULL)
|
||||
{
|
||||
/*
|
||||
|
||||
419
src/heuristic.c
Normal file
419
src/heuristic.c
Normal file
@ -0,0 +1,419 @@
|
||||
/**
|
||||
*
|
||||
*@file heuristic.c
|
||||
*
|
||||
* Heuristics code for Arachne method
|
||||
*
|
||||
*/
|
||||
|
||||
#include <float.h>
|
||||
|
||||
#include "binding.h"
|
||||
#include "system.h"
|
||||
#include "specialterm.h"
|
||||
#include "switches.h"
|
||||
|
||||
#define length step
|
||||
|
||||
//! Check whether a binding (goal) is selectable
|
||||
int
|
||||
is_goal_selectable (const Binding b)
|
||||
{
|
||||
if (b != NULL)
|
||||
{
|
||||
if (!b->blocked && !b->done)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
//! Count selectable goals
|
||||
int
|
||||
count_selectable_goals (const System sys)
|
||||
{
|
||||
List bl;
|
||||
int n;
|
||||
|
||||
n = 0;
|
||||
bl = sys->bindings;
|
||||
while (bl != NULL)
|
||||
{
|
||||
Binding b;
|
||||
|
||||
b = (Binding) bl->data;
|
||||
if (is_goal_selectable (b))
|
||||
{
|
||||
n++;
|
||||
}
|
||||
bl = bl->next;
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
//! Return first selectable goal in the list
|
||||
/**
|
||||
* The return list entry is either NULL, or a selectable goal.
|
||||
*/
|
||||
List
|
||||
first_selectable_goal (List bl)
|
||||
{
|
||||
while (bl != NULL && !is_goal_selectable ((Binding) bl->data))
|
||||
{
|
||||
bl = bl->next;
|
||||
}
|
||||
return bl;
|
||||
}
|
||||
|
||||
//! Give an indication of the amount of consequences binding a term has
|
||||
/**
|
||||
* Given a term, returns a float. 0: maximum consequences, 1: no consequences.
|
||||
*/
|
||||
float
|
||||
termBindConsequences (const System sys, Term t)
|
||||
{
|
||||
Termlist openVariables;
|
||||
|
||||
openVariables = termlistAddVariables (NULL, t);
|
||||
if (openVariables == NULL)
|
||||
{
|
||||
// No variables, no consequences
|
||||
return 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
// For each run event in the semitrace, check whether it contains any
|
||||
// of the open variables.
|
||||
int totalCount;
|
||||
int affectedCount;
|
||||
int run;
|
||||
|
||||
totalCount = 0;
|
||||
affectedCount = 0;
|
||||
run = 0;
|
||||
while (run < sys->maxruns)
|
||||
{
|
||||
Roledef rd;
|
||||
int step;
|
||||
|
||||
rd = sys->runs[run].start;
|
||||
step = 0;
|
||||
while (step < sys->runs[run].length)
|
||||
{
|
||||
Termlist tl;
|
||||
|
||||
tl = openVariables;
|
||||
while (tl != NULL)
|
||||
{
|
||||
if ((rd->type == READ || rd->type == SEND)
|
||||
&& termSubTerm (rd->message, tl->term))
|
||||
{
|
||||
// This run event contains the open variable
|
||||
affectedCount++;
|
||||
tl = NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
tl = tl->next;
|
||||
}
|
||||
}
|
||||
totalCount++;
|
||||
step++;
|
||||
rd = rd->next;
|
||||
}
|
||||
run++;
|
||||
}
|
||||
|
||||
termlistDelete (openVariables);
|
||||
if (totalCount > 0)
|
||||
{
|
||||
// Valid computation
|
||||
return (float) (totalCount - affectedCount) / totalCount;
|
||||
}
|
||||
else
|
||||
{
|
||||
// No consequences, ensure no division by 0
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
//! Determine whether a term is an open nonce variable
|
||||
/**
|
||||
* Does not explore subterms
|
||||
*/
|
||||
int
|
||||
isOpenNonceVar (Term t)
|
||||
{
|
||||
t = deVar (t);
|
||||
if (realTermVariable (t))
|
||||
{
|
||||
return inTermlist (t->stype, TERM_Nonce);
|
||||
}
|
||||
else
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
//! Count unique open variables in term
|
||||
/**
|
||||
*/
|
||||
int
|
||||
count_open_variables (const Term t)
|
||||
{
|
||||
Termlist tl;
|
||||
int n;
|
||||
|
||||
tl = NULL;
|
||||
termlistAddVariables (tl, t);
|
||||
n = 0;
|
||||
while (tl != NULL)
|
||||
{
|
||||
if (!inTermlist (tl->next, t))
|
||||
{
|
||||
if (isOpenNonceVar (t))
|
||||
{
|
||||
n = n + 1;
|
||||
}
|
||||
}
|
||||
tl = tl->next;
|
||||
}
|
||||
termlistDelete (tl);
|
||||
return n;
|
||||
}
|
||||
|
||||
|
||||
|
||||
//! Athena-like factor
|
||||
/**
|
||||
* Lower is better (more nonce variables)
|
||||
*/
|
||||
float
|
||||
term_noncevariables_level (const Term t)
|
||||
{
|
||||
int onv;
|
||||
const int enough = 2;
|
||||
|
||||
onv = count_open_variables (t);
|
||||
if (onv >= enough)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
return 1 - (onv / enough);
|
||||
}
|
||||
}
|
||||
|
||||
//! Goal selection
|
||||
/**
|
||||
* Selects the most constrained goal.
|
||||
*
|
||||
* First selection is on level; thus, keys are selected first.
|
||||
*
|
||||
* Because the list starts with the newest terms, and we use <= (as opposed to <), we
|
||||
* ensure that for goals with equal constraint levels, we select the oldest one.
|
||||
*
|
||||
* --select-goal has two distint interpretations. If it is 0 or greater, it a
|
||||
* selection mask. If it is smaller than 0, it is some special tactic.
|
||||
*
|
||||
* selection masks for --select-goal
|
||||
* 1: constrain level of term
|
||||
* 2: key or not
|
||||
* 4: consequences determination
|
||||
* 8: select also single variables (that are not role variables)
|
||||
* 16: single variables are better
|
||||
*
|
||||
* special tactics for --select-goal
|
||||
* -1: random goal selection
|
||||
*
|
||||
*/
|
||||
Binding
|
||||
select_goal_masked (const System sys)
|
||||
{
|
||||
List bl;
|
||||
Binding best;
|
||||
float min_constrain;
|
||||
int mode;
|
||||
|
||||
// mode bits local storage
|
||||
mode = switches.arachneSelector;
|
||||
|
||||
// Find the most constrained goal
|
||||
if (switches.output == PROOF)
|
||||
{
|
||||
indentPrint ();
|
||||
eprintf ("Listing open goals that might be chosen: ");
|
||||
}
|
||||
min_constrain = FLT_MAX;
|
||||
bl = sys->bindings;
|
||||
best = NULL;
|
||||
while (bl != NULL)
|
||||
{
|
||||
Binding b;
|
||||
|
||||
b = (Binding) bl->data;
|
||||
|
||||
// Only if not done and not blocked
|
||||
if (is_goal_selectable (b))
|
||||
{
|
||||
int allow;
|
||||
Term gterm;
|
||||
|
||||
allow = 0;
|
||||
gterm = deVar (b->term);
|
||||
if (mode & 8)
|
||||
{
|
||||
// check for singular variable
|
||||
if (realTermVariable (gterm))
|
||||
{
|
||||
// singular variable only if it is not a role name variable
|
||||
allow = !gterm->roleVar;
|
||||
}
|
||||
else
|
||||
{
|
||||
// not a singular variable, allow
|
||||
allow = 1;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// Normally (mode & 8 == 0) we ignore any singular variables
|
||||
allow = !realTermVariable (gterm);
|
||||
}
|
||||
|
||||
if (allow)
|
||||
{
|
||||
float buf_constrain;
|
||||
int buf_weight;
|
||||
int smode;
|
||||
|
||||
void adapt (const int w, const float fl)
|
||||
{
|
||||
buf_constrain = buf_constrain + w * fl;
|
||||
buf_weight = buf_weight + w;
|
||||
}
|
||||
|
||||
void erode (const int w, const float fl)
|
||||
{
|
||||
if (smode & 1)
|
||||
{
|
||||
adapt (w, fl);
|
||||
}
|
||||
smode = smode / 2;
|
||||
}
|
||||
|
||||
// buf_constrain is the addition of the factors before division by weight
|
||||
buf_constrain = 0;
|
||||
buf_weight = 0;
|
||||
|
||||
if (switches.output == PROOF && best != NULL)
|
||||
eprintf (", ");
|
||||
|
||||
// We will shift this mode variable
|
||||
smode = mode;
|
||||
|
||||
// Determine buf_constrain levels
|
||||
// Bit 0: 1 constrain level
|
||||
erode (1, term_constrain_level (b->term));
|
||||
// Bit 1: 2 key level (inverted)
|
||||
erode (1, 0.5 * (1 - b->level));
|
||||
// Bit 2: 4 consequence level
|
||||
erode (1, termBindConsequences (sys, b->term));
|
||||
// Bit 3: 8 single variables first
|
||||
erode (1, 1 - isTermVariable (b->term));
|
||||
// Bit 4: 16 nonce variables level (Cf. what I think is in Athena)
|
||||
erode (1, term_noncevariables_level (b->term));
|
||||
// Define legal range
|
||||
if (smode > 0)
|
||||
error ("--goal-select mode %i is illegal", mode);
|
||||
|
||||
// Weigh result
|
||||
if (buf_weight == 0 || buf_constrain <= min_constrain)
|
||||
{
|
||||
min_constrain = buf_constrain;
|
||||
best = b;
|
||||
if (switches.output == PROOF)
|
||||
eprintf ("*");
|
||||
}
|
||||
if (switches.output == PROOF)
|
||||
{
|
||||
termPrint (b->term);
|
||||
if (mode & 2)
|
||||
{
|
||||
eprintf ("[%i]", b->level);
|
||||
}
|
||||
eprintf ("<%.2f>", buf_constrain);
|
||||
}
|
||||
}
|
||||
}
|
||||
bl = bl->next;
|
||||
}
|
||||
if (switches.output == PROOF)
|
||||
{
|
||||
if (best == NULL)
|
||||
eprintf ("none");
|
||||
eprintf ("\n");
|
||||
}
|
||||
return best;
|
||||
}
|
||||
|
||||
//! Goal selection special case -1: random
|
||||
/**
|
||||
* Simply picks an open goal randomly. Has to be careful to skip singular stuff etc.
|
||||
*/
|
||||
Binding
|
||||
select_goal_random (const System sys)
|
||||
{
|
||||
int n;
|
||||
|
||||
n = count_selectable_goals (sys);
|
||||
if (n > 0)
|
||||
{
|
||||
int choice;
|
||||
List bl;
|
||||
|
||||
// Choose a random goal between 0 and n
|
||||
choice = rand () % n;
|
||||
|
||||
// Fetch it
|
||||
bl = sys->bindings;
|
||||
while (choice >= 0)
|
||||
{
|
||||
bl = first_selectable_goal (bl);
|
||||
if (bl == NULL)
|
||||
{
|
||||
error ("Random chooser selected a NULL goal.");
|
||||
}
|
||||
choice--;
|
||||
}
|
||||
return (Binding) bl->data;
|
||||
}
|
||||
else
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
//! Goal selection function, generic
|
||||
Binding
|
||||
select_goal (const System sys)
|
||||
{
|
||||
if (switches.arachneSelector >= 0)
|
||||
{
|
||||
// Masked
|
||||
return select_goal_masked (sys);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Special cases
|
||||
switch (switches.arachneSelector)
|
||||
{
|
||||
case -1:
|
||||
return select_goal_random (sys);
|
||||
}
|
||||
error ("Unknown value (<0) for --goal-select.");
|
||||
}
|
||||
}
|
||||
9
src/heuristic.h
Normal file
9
src/heuristic.h
Normal file
@ -0,0 +1,9 @@
|
||||
#ifndef HEURISTIC
|
||||
#define HEURISTIC
|
||||
|
||||
#include "system.h"
|
||||
#include "binding.h"
|
||||
|
||||
Binding select_goal (const System sys);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user