mirror of
https://github.com/Z3Prover/z3
synced 2025-04-08 18:31:49 +00:00
merging interpolation and duality changes into unstable
This commit is contained in:
commit
75bb495585
24
src/duality/duality.h
Normal file → Executable file
24
src/duality/duality.h
Normal file → Executable file
|
@ -1184,7 +1184,13 @@ namespace Duality {
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hash_map<Edge *, Edge *> EdgeCloneMap;
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std::vector<expr> alit_stack;
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std::vector<unsigned> alit_stack_sizes;
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hash_map<Edge *, uptr<LogicSolver> > edge_solvers;
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// to let us use one solver per edge
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struct edge_solver {
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hash_map<ast,expr> AssumptionLits;
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uptr<solver> slvr;
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};
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hash_map<Edge *, edge_solver > edge_solvers;
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#ifdef LIMIT_STACK_WEIGHT
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struct weight_counter {
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@ -1236,19 +1242,23 @@ namespace Duality {
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void GetTermTreeAssertionLiteralsRec(TermTree *assumptions);
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LogicSolver *SolverForEdge(Edge *edge, bool models);
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edge_solver &SolverForEdge(Edge *edge, bool models, bool axioms);
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public:
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struct scoped_solver_for_edge {
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LogicSolver *orig_ls;
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solver *orig_slvr;
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RPFP_caching *rpfp;
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scoped_solver_for_edge(RPFP_caching *_rpfp, Edge *edge, bool models = false){
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edge_solver *es;
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scoped_solver_for_edge(RPFP_caching *_rpfp, Edge *edge, bool models = false, bool axioms = false){
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rpfp = _rpfp;
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orig_ls = rpfp->ls;
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rpfp->ls = rpfp->SolverForEdge(edge,models);
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orig_slvr = rpfp->ls->slvr;
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es = &(rpfp->SolverForEdge(edge,models,axioms));
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rpfp->ls->slvr = es->slvr.get();
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rpfp->AssumptionLits.swap(es->AssumptionLits);
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}
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~scoped_solver_for_edge(){
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rpfp->ls = orig_ls;
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rpfp->ls->slvr = orig_slvr;
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rpfp->AssumptionLits.swap(es->AssumptionLits);
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}
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};
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53
src/duality/duality_rpfp.cpp
Normal file → Executable file
53
src/duality/duality_rpfp.cpp
Normal file → Executable file
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@ -2711,10 +2711,12 @@ namespace Duality {
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const std::vector<expr> &theory = ls->get_axioms();
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for(unsigned i = 0; i < theory.size(); i++)
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s.add(theory[i]);
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if(s.check(lits.size(),&lits[0]) != unsat)
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throw "should be unsat";
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for(int k = 0; k < 100; k++) // keep trying, maybe MBQI will do something!
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if(s.check(lits.size(),&lits[0]) == unsat)
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goto is_unsat;
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throw "should be unsat";
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}
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is_unsat:
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for(unsigned i = 0; i < conjuncts.size(); ){
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std::swap(conjuncts[i],conjuncts.back());
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std::swap(lits[i],lits.back());
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@ -2747,8 +2749,20 @@ namespace Duality {
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// verify
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check_result res = CheckCore(lits,full_core);
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if(res != unsat)
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if(res != unsat){
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// add the axioms in the off chance they are useful
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const std::vector<expr> &theory = ls->get_axioms();
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for(unsigned i = 0; i < theory.size(); i++)
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GetAssumptionLits(theory[i],assumps);
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lits = assumps;
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std::copy(core.begin(),core.end(),std::inserter(lits,lits.end()));
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for(int k = 0; k < 100; k++) // keep trying, maybe MBQI will do something!
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if((res = CheckCore(lits,full_core)) == unsat)
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goto is_unsat;
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throw "should be unsat";
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}
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is_unsat:
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FilterCore(core,full_core);
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std::vector<expr> dummy;
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@ -2889,13 +2903,20 @@ namespace Duality {
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timer_stop("Generalize");
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}
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RPFP::LogicSolver *RPFP_caching::SolverForEdge(Edge *edge, bool models){
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uptr<LogicSolver> &p = edge_solvers[edge];
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RPFP_caching::edge_solver &RPFP_caching::SolverForEdge(Edge *edge, bool models, bool axioms){
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edge_solver &es = edge_solvers[edge];
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uptr<solver> &p = es.slvr;
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if(!p.get()){
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scoped_no_proof no_proofs_please(ctx.m()); // no proofs
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p.set(new iZ3LogicSolver(ctx,models)); // no models
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p.set(new solver(ctx,true,models)); // no models
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if(axioms){
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RPFP::LogicSolver *ls = edge->owner->ls;
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const std::vector<expr> &axs = ls->get_axioms();
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for(unsigned i = 0; i < axs.size(); i++)
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p.get()->add(axs[i]);
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}
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}
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return p.get();
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return es;
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}
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@ -3362,6 +3383,8 @@ namespace Duality {
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}
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}
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bool some_labels = false;
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// create the edges
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for(unsigned i = 0; i < clauses.size(); i++){
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@ -3397,17 +3420,23 @@ namespace Duality {
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Term labeled = body;
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std::vector<label_struct > lbls; // TODO: throw this away for now
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body = RemoveLabels(body,lbls);
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if(!eq(labeled,body))
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some_labels = true; // remember if there are labels, as we then can't do qe_lite
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// body = IneqToEq(body); // UFO converts x=y to (x<=y & x >= y). Undo this.
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body = body.simplify();
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#ifdef USE_QE_LITE
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std::set<int> idxs;
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for(unsigned j = 0; j < Indparams.size(); j++)
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if(Indparams[j].is_var())
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idxs.insert(Indparams[j].get_index_value());
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body = body.qe_lite(idxs,false);
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if(!some_labels){ // can't do qe_lite if we have to reconstruct labels
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for(unsigned j = 0; j < Indparams.size(); j++)
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if(Indparams[j].is_var())
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idxs.insert(Indparams[j].get_index_value());
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body = body.qe_lite(idxs,false);
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}
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hash_map<int,hash_map<ast,Term> > sb_memo;
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body = SubstBoundRec(sb_memo,substs[i],0,body);
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if(some_labels)
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labeled = SubstBoundRec(sb_memo,substs[i],0,labeled);
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for(unsigned j = 0; j < Indparams.size(); j++)
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Indparams[j] = SubstBoundRec(sb_memo, substs[i], 0, Indparams[j]);
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#endif
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29
src/duality/duality_solver.cpp
Normal file → Executable file
29
src/duality/duality_solver.cpp
Normal file → Executable file
|
@ -51,12 +51,17 @@ Revision History:
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// #define TOP_DOWN
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// #define EFFORT_BOUNDED_STRAT
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#define SKIP_UNDERAPPROX_NODES
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#define USE_RPFP_CLONE
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// #define KEEP_EXPANSIONS
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// #define USE_CACHING_RPFP
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// #define PROPAGATE_BEFORE_CHECK
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#define USE_RPFP_CLONE
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#define USE_NEW_GEN_CANDS
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//#define NO_PROPAGATE
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//#define NO_GENERALIZE
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//#define NO_DECISIONS
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namespace Duality {
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// TODO: must be a better place for this...
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@ -129,13 +134,11 @@ namespace Duality {
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{
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scoped_no_proof no_proofs_please(ctx.m());
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#ifdef USE_RPFP_CLONE
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clone_ls = new RPFP::iZ3LogicSolver(ctx, false); // no models needed for this one
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clone_rpfp = new RPFP_caching(clone_ls);
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clone_rpfp = new RPFP_caching(rpfp->ls);
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clone_rpfp->Clone(rpfp);
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#endif
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#ifdef USE_NEW_GEN_CANDS
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gen_cands_ls = new RPFP::iZ3LogicSolver(ctx);
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gen_cands_rpfp = new RPFP_caching(gen_cands_ls);
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gen_cands_rpfp = new RPFP_caching(rpfp->ls);
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gen_cands_rpfp->Clone(rpfp);
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#endif
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}
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@ -144,20 +147,16 @@ namespace Duality {
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~Duality(){
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#ifdef USE_RPFP_CLONE
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delete clone_rpfp;
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delete clone_ls;
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#endif
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#ifdef USE_NEW_GEN_CANDS
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delete gen_cands_rpfp;
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delete gen_cands_ls;
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#endif
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}
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#ifdef USE_RPFP_CLONE
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RPFP::LogicSolver *clone_ls;
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RPFP_caching *clone_rpfp;
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#endif
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#ifdef USE_NEW_GEN_CANDS
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RPFP::LogicSolver *gen_cands_ls;
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RPFP_caching *gen_cands_rpfp;
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#endif
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@ -1255,7 +1254,7 @@ namespace Duality {
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slvr.pop(1);
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delete checker;
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#else
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RPFP_caching::scoped_solver_for_edge(gen_cands_rpfp,edge,true /* models */);
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RPFP_caching::scoped_solver_for_edge ssfe(gen_cands_rpfp,edge,true /* models */, true /*axioms*/);
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gen_cands_rpfp->Push();
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Node *root = CheckerForEdgeClone(edge,gen_cands_rpfp);
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if(gen_cands_rpfp->Check(root) != unsat){
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@ -1940,11 +1939,15 @@ namespace Duality {
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for(unsigned i = 0; i < expansions.size(); i++){
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Node *node = expansions[i];
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tree->SolveSingleNode(top,node);
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#ifdef NO_GENERALIZE
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node->Annotation.Formula = tree->RemoveRedundancy(node->Annotation.Formula).simplify();
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#else
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if(expansions.size() == 1 && NodeTooComplicated(node))
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SimplifyNode(node);
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else
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node->Annotation.Formula = tree->RemoveRedundancy(node->Annotation.Formula).simplify();
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Generalize(node);
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#endif
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if(RecordUpdate(node))
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update_count++;
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else
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@ -1984,7 +1987,9 @@ namespace Duality {
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if(stack.size() == 1)break;
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if(prev_level_used){
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Node *node = stack.back().expansions[0];
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#ifndef NO_PROPAGATE
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if(!Propagate(node)) break;
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#endif
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if(!RecordUpdate(node)) break; // shouldn't happen!
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RemoveUpdateNodesAtCurrentLevel(); // this level is about to be deleted -- remove its children from update list
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propagated = true;
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@ -2006,11 +2011,13 @@ namespace Duality {
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}
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else {
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was_sat = true;
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tree->Push();
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tree->Push();
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std::vector<Node *> &expansions = stack.back().expansions;
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#ifndef NO_DECISIONS
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for(unsigned i = 0; i < expansions.size(); i++){
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tree->FixCurrentState(expansions[i]->Outgoing);
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}
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#endif
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#if 0
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if(tree->slvr().check() == unsat)
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throw "help!";
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0
src/duality/duality_wrapper.cpp
Normal file → Executable file
0
src/duality/duality_wrapper.cpp
Normal file → Executable file
23
src/interp/iz3mgr.cpp
Normal file → Executable file
23
src/interp/iz3mgr.cpp
Normal file → Executable file
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@ -249,6 +249,9 @@ iz3mgr::ast iz3mgr::clone(const ast &t, const std::vector<ast> &_args){
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void iz3mgr::show(ast t){
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if(t.null()){
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std::cout << "(null)" << std::endl;
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}
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params_ref p;
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p.set_bool("flat_assoc",false);
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std::cout << mk_pp(t.raw(), m(), p) << std::endl;
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|
@ -693,10 +696,13 @@ void iz3mgr::linear_comb(ast &P, const ast &c, const ast &Q, bool round_off){
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throw "not an inequality";
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}
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}
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Qrhs = make(Times,c,Qrhs);
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bool pstrict = op(P) == Lt, strict = pstrict || qstrict;
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if(pstrict && qstrict && round_off)
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bool pstrict = op(P) == Lt;
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if(qstrict && round_off && (pstrict || !(c == make_int(rational(1))))){
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Qrhs = make(Sub,Qrhs,make_int(rational(1)));
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qstrict = false;
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}
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Qrhs = make(Times,c,Qrhs);
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bool strict = pstrict || qstrict;
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if(strict)
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P = make(Lt,arg(P,0),make(Plus,arg(P,1),Qrhs));
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else
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|
@ -881,3 +887,14 @@ iz3mgr::ast iz3mgr::apply_quant(opr quantifier, ast var, ast e){
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std::vector<ast> bvs; bvs.push_back(var);
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return make_quant(quantifier,bvs,e);
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}
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#if 0
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void iz3mgr::get_bound_substitutes(stl_ext::hash_map<ast,bool> &memo, const ast &e, const ast &var, std::vector<ast> &substs){
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std::pair<ast,bool> foo(e,false);
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std::pair<hash_map<ast,bool>::iterator,bool> bar = memo.insert(foo);
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if(bar.second){
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if(op(e) ==
|
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}
|
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|
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}
|
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#endif
|
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|
|
0
src/interp/iz3mgr.h
Normal file → Executable file
0
src/interp/iz3mgr.h
Normal file → Executable file
255
src/interp/iz3proof_itp.cpp
Normal file → Executable file
255
src/interp/iz3proof_itp.cpp
Normal file → Executable file
|
@ -579,18 +579,36 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
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return is_ineq(ineq);
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}
|
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|
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ast destruct_cond_ineq(const ast &ineq, ast &Aproves, ast &Bproves){
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ast res = ineq;
|
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opr o = op(res);
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if(o == And){
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Aproves = my_and(Aproves,arg(res,0));
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res = arg(res,1);
|
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o = op(res);
|
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}
|
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if(o == Implies){
|
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Bproves = my_and(Bproves,arg(res,0));
|
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res = arg(res,1);
|
||||
}
|
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return res;
|
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}
|
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|
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ast simplify_sum(std::vector<ast> &args){
|
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ast Aproves = mk_true(), Bproves = mk_true();
|
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ast ineq = args[0];
|
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ast ineq = destruct_cond_ineq(args[0],Aproves,Bproves);
|
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if(!is_normal_ineq(ineq)) throw cannot_simplify();
|
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sum_cond_ineq(ineq,args[1],args[2],Aproves,Bproves);
|
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return my_and(Aproves,my_implies(Bproves,ineq));
|
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}
|
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|
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ast simplify_rotate_sum(const ast &pl, const ast &pf){
|
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ast cond = mk_true();
|
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ast Aproves = mk_true(), Bproves = mk_true();
|
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ast ineq = make(Leq,make_int("0"),make_int("0"));
|
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return rotate_sum_rec(pl,pf,cond,ineq);
|
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ineq = rotate_sum_rec(pl,pf,Aproves,Bproves,ineq);
|
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if(is_true(Aproves) && is_true(Bproves))
|
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return ineq;
|
||||
return my_and(Aproves,my_implies(Bproves,ineq));
|
||||
}
|
||||
|
||||
bool is_rewrite_chain(const ast &chain){
|
||||
|
@ -623,7 +641,11 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
|
||||
void sum_cond_ineq(ast &ineq, const ast &coeff2, const ast &ineq2, ast &Aproves, ast &Bproves){
|
||||
opr o = op(ineq2);
|
||||
if(o == Implies){
|
||||
if(o == And){
|
||||
sum_cond_ineq(ineq,coeff2,arg(ineq2,1),Aproves,Bproves);
|
||||
Aproves = my_and(Aproves,arg(ineq2,0));
|
||||
}
|
||||
else if(o == Implies){
|
||||
sum_cond_ineq(ineq,coeff2,arg(ineq2,1),Aproves,Bproves);
|
||||
Bproves = my_and(Bproves,arg(ineq2,0));
|
||||
}
|
||||
|
@ -683,23 +705,20 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
return make(op(ineq),mk_idiv(arg(ineq,0),divisor),mk_idiv(arg(ineq,1),divisor));
|
||||
}
|
||||
|
||||
ast rotate_sum_rec(const ast &pl, const ast &pf, ast &Bproves, ast &ineq){
|
||||
if(pf == pl)
|
||||
return my_implies(Bproves,simplify_ineq(ineq));
|
||||
ast rotate_sum_rec(const ast &pl, const ast &pf, ast &Aproves, ast &Bproves, ast &ineq){
|
||||
if(pf == pl){
|
||||
if(sym(ineq) == normal)
|
||||
return ineq;
|
||||
return simplify_ineq(ineq);
|
||||
}
|
||||
if(op(pf) == Uninterpreted && sym(pf) == sum){
|
||||
if(arg(pf,2) == pl){
|
||||
ast Aproves = mk_true();
|
||||
sum_cond_ineq(ineq,make_int("1"),arg(pf,0),Aproves,Bproves);
|
||||
if(!is_true(Aproves))
|
||||
throw "help!";
|
||||
ineq = idiv_ineq(ineq,arg(pf,1));
|
||||
return my_implies(Bproves,ineq);
|
||||
return ineq;
|
||||
}
|
||||
ast Aproves = mk_true();
|
||||
sum_cond_ineq(ineq,arg(pf,1),arg(pf,2),Aproves,Bproves);
|
||||
if(!is_true(Aproves))
|
||||
throw "help!";
|
||||
return rotate_sum_rec(pl,arg(pf,0),Bproves,ineq);
|
||||
return rotate_sum_rec(pl,arg(pf,0),Aproves,Bproves,ineq);
|
||||
}
|
||||
throw cannot_simplify();
|
||||
}
|
||||
|
@ -749,6 +768,28 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
return res;
|
||||
}
|
||||
|
||||
ast unmixed_eq2ineq(const ast &lhs, const ast &rhs, opr comp_op, const ast &equa, ast &cond){
|
||||
ast ineqs= chain_ineqs(comp_op,LitA,equa,lhs,rhs); // chain must be from lhs to rhs
|
||||
cond = my_and(cond,chain_conditions(LitA,equa));
|
||||
ast Bconds = z3_simplify(chain_conditions(LitB,equa));
|
||||
if(is_true(Bconds) && op(ineqs) != And)
|
||||
return my_implies(cond,ineqs);
|
||||
if(op(ineqs) != And)
|
||||
return my_and(Bconds,my_implies(cond,ineqs));
|
||||
throw "help!";
|
||||
}
|
||||
|
||||
ast add_mixed_eq2ineq(const ast &lhs, const ast &rhs, const ast &equa, const ast &itp){
|
||||
if(is_true(equa))
|
||||
return itp;
|
||||
std::vector<ast> args(3);
|
||||
args[0] = itp;
|
||||
args[1] = make_int("1");
|
||||
ast ineq = make(Leq,make_int(rational(0)),make_int(rational(0)));
|
||||
args[2] = make_normal(ineq,cons_normal(fix_normal(lhs,rhs,equa),mk_true()));
|
||||
return simplify_sum(args);
|
||||
}
|
||||
|
||||
ast simplify_rotate_eq2leq(const ast &pl, const ast &neg_equality, const ast &pf){
|
||||
if(pl == arg(pf,1)){
|
||||
ast cond = mk_true();
|
||||
|
@ -756,20 +797,21 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
if(is_equivrel_chain(equa)){
|
||||
ast lhs,rhs; eq_from_ineq(arg(neg_equality,0),lhs,rhs); // get inequality we need to prove
|
||||
LitType lhst = get_term_type(lhs), rhst = get_term_type(rhs);
|
||||
if(lhst != LitMixed && rhst != LitMixed){
|
||||
ast ineqs= chain_ineqs(op(arg(neg_equality,0)),LitA,equa,lhs,rhs); // chain must be from lhs to rhs
|
||||
cond = my_and(cond,chain_conditions(LitA,equa));
|
||||
ast Bconds = z3_simplify(chain_conditions(LitB,equa));
|
||||
if(is_true(Bconds) && op(ineqs) != And)
|
||||
return my_implies(cond,ineqs);
|
||||
}
|
||||
if(lhst != LitMixed && rhst != LitMixed)
|
||||
return unmixed_eq2ineq(lhs, rhs, op(arg(neg_equality,0)), equa, cond);
|
||||
else {
|
||||
ast itp = make(Leq,make_int(rational(0)),make_int(rational(0)));
|
||||
return make_normal(itp,cons_normal(fix_normal(lhs,rhs,equa),mk_true()));
|
||||
ast left, left_term, middle, right_term, right;
|
||||
left = get_left_movers(equa,lhs,middle,left_term);
|
||||
middle = get_right_movers(middle,rhs,right,right_term);
|
||||
ast itp = unmixed_eq2ineq(left_term, right_term, op(arg(neg_equality,0)), middle, cond);
|
||||
// itp = my_implies(cond,itp);
|
||||
itp = add_mixed_eq2ineq(lhs, left_term, left, itp);
|
||||
itp = add_mixed_eq2ineq(right_term, rhs, right, itp);
|
||||
return itp;
|
||||
}
|
||||
}
|
||||
}
|
||||
throw cannot_simplify();
|
||||
throw "help!";
|
||||
}
|
||||
|
||||
void reverse_modpon(std::vector<ast> &args){
|
||||
|
@ -836,6 +878,8 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
ast equa = sep_cond(args[0],cond);
|
||||
if(is_equivrel_chain(equa))
|
||||
return my_implies(cond,reverse_chain(equa));
|
||||
if(is_negation_chain(equa))
|
||||
return commute_negation_chain(equa);
|
||||
throw cannot_simplify();
|
||||
}
|
||||
|
||||
|
@ -909,7 +953,9 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
get_subterm_normals(ineq1,ineq2,tail,nc,top_pos,memo, Aproves, Bproves);
|
||||
ast itp;
|
||||
if(is_rewrite_side(LitA,head)){
|
||||
itp = ineq1;
|
||||
itp = make(Leq,make_int("0"),make_int("0"));
|
||||
linear_comb(itp,make_int("1"),ineq1); // make sure it is normal form
|
||||
//itp = ineq1;
|
||||
ast mc = z3_simplify(chain_side_proves(LitB,pref));
|
||||
Bproves = my_and(Bproves,mc);
|
||||
}
|
||||
|
@ -951,7 +997,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
ast simplify_modpon(const std::vector<ast> &args){
|
||||
ast Aproves = mk_true(), Bproves = mk_true();
|
||||
ast chain = simplify_modpon_fwd(args,Bproves);
|
||||
ast Q2 = sep_cond(args[2],Bproves);
|
||||
ast Q2 = destruct_cond_ineq(args[2],Aproves,Bproves);
|
||||
ast interp;
|
||||
if(is_normal_ineq(Q2)){ // inequalities are special
|
||||
ast nQ2 = rewrite_chain_to_normal_ineq(chain,Aproves,Bproves);
|
||||
|
@ -1450,6 +1496,50 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
return is_negation_chain(rest);
|
||||
}
|
||||
|
||||
ast commute_negation_chain(const ast &chain){
|
||||
if(is_true(chain))
|
||||
return chain;
|
||||
ast last = chain_last(chain);
|
||||
ast rest = chain_rest(chain);
|
||||
if(is_true(rest)){
|
||||
ast old = rewrite_rhs(last);
|
||||
if(!(op(old) == Not))
|
||||
throw "bad negative equality chain";
|
||||
ast equ = arg(old,0);
|
||||
if(!is_equivrel(equ))
|
||||
throw "bad negative equality chain";
|
||||
last = rewrite_update_rhs(last,top_pos,make(Not,make(op(equ),arg(equ,1),arg(equ,0))),make(True));
|
||||
return chain_cons(rest,last);
|
||||
}
|
||||
ast pos = rewrite_pos(last);
|
||||
if(pos == top_pos)
|
||||
throw "bad negative equality chain";
|
||||
int idx = pos_arg(pos);
|
||||
if(idx != 0)
|
||||
throw "bad negative equality chain";
|
||||
pos = arg(pos,1);
|
||||
if(pos == top_pos){
|
||||
ast lhs = rewrite_lhs(last);
|
||||
ast rhs = rewrite_rhs(last);
|
||||
if(op(lhs) != Equal || op(rhs) != Equal)
|
||||
throw "bad negative equality chain";
|
||||
last = make_rewrite(rewrite_side(last),rewrite_pos(last),rewrite_cond(last),
|
||||
make(Iff,make(Equal,arg(lhs,1),arg(lhs,0)),make(Equal,arg(rhs,1),arg(rhs,0))));
|
||||
}
|
||||
else {
|
||||
idx = pos_arg(pos);
|
||||
if(idx == 0)
|
||||
idx = 1;
|
||||
else if(idx == 1)
|
||||
idx = 0;
|
||||
else
|
||||
throw "bad negative equality chain";
|
||||
pos = pos_add(0,pos_add(idx,arg(pos,1)));
|
||||
last = make_rewrite(rewrite_side(last),pos,rewrite_cond(last),rewrite_equ(last));
|
||||
}
|
||||
return chain_cons(commute_negation_chain(rest),last);
|
||||
}
|
||||
|
||||
// split a rewrite chain into head and tail at last top-level rewrite
|
||||
ast get_head_chain(const ast &chain, ast &tail, bool is_not = true){
|
||||
ast last = chain_last(chain);
|
||||
|
@ -1466,6 +1556,47 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
return head;
|
||||
}
|
||||
|
||||
// split a rewrite chain into head and tail at last non-mixed term
|
||||
ast get_right_movers(const ast &chain, const ast &rhs, ast &tail, ast &mid){
|
||||
if(is_true(chain) || get_term_type(rhs) != LitMixed){
|
||||
mid = rhs;
|
||||
tail = mk_true();
|
||||
return chain;
|
||||
}
|
||||
ast last = chain_last(chain);
|
||||
ast rest = chain_rest(chain);
|
||||
ast mm = subst_in_pos(rhs,rewrite_pos(last),rewrite_lhs(last));
|
||||
ast res = get_right_movers(rest,mm,tail,mid);
|
||||
tail = chain_cons(tail,last);
|
||||
return res;
|
||||
}
|
||||
|
||||
// split a rewrite chain into head and tail at first non-mixed term
|
||||
ast get_left_movers(const ast &chain, const ast &lhs, ast &tail, ast &mid){
|
||||
if(is_true(chain)){
|
||||
mid = lhs;
|
||||
if(get_term_type(lhs) != LitMixed){
|
||||
tail = mk_true();
|
||||
return chain;
|
||||
}
|
||||
return ast();
|
||||
}
|
||||
ast last = chain_last(chain);
|
||||
ast rest = chain_rest(chain);
|
||||
ast res = get_left_movers(rest,lhs,tail,mid);
|
||||
if(res.null()){
|
||||
mid = subst_in_pos(mid,rewrite_pos(last),rewrite_rhs(last));
|
||||
if(get_term_type(mid) != LitMixed){
|
||||
tail = mk_true();
|
||||
return chain;
|
||||
}
|
||||
return ast();
|
||||
}
|
||||
tail = chain_cons(tail,last);
|
||||
return res;
|
||||
}
|
||||
|
||||
|
||||
struct cannot_split {};
|
||||
|
||||
/** Split a chain of rewrites two chains, operating on positions 0 and 1.
|
||||
|
@ -1668,11 +1799,13 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
}
|
||||
|
||||
ast fix_normal(const ast &lhs, const ast &rhs, const ast &proof){
|
||||
LitType lhst = get_term_type(lhs);
|
||||
LitType rhst = get_term_type(rhs);
|
||||
if(rhst != LitMixed || ast_id(lhs) < ast_id(rhs))
|
||||
if(lhst == LitMixed && (rhst != LitMixed || ast_id(lhs) < ast_id(rhs)))
|
||||
return make_normal_step(lhs,rhs,proof);
|
||||
else
|
||||
if(rhst == LitMixed && (lhst != LitMixed || ast_id(rhs) < ast_id(lhs)))
|
||||
return make_normal_step(rhs,lhs,reverse_chain(proof));
|
||||
throw "help!";
|
||||
}
|
||||
|
||||
ast chain_side_proves(LitType side, const ast &chain){
|
||||
|
@ -1692,8 +1825,10 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
ast lhs2 = normal_lhs(f2);
|
||||
int id1 = ast_id(lhs1);
|
||||
int id2 = ast_id(lhs2);
|
||||
if(id1 < id2) return cons_normal(f1,merge_normal_chains_rec(normal_rest(chain1),chain2,trans,Aproves,Bproves));
|
||||
if(id2 < id1) return cons_normal(f2,merge_normal_chains_rec(chain1,normal_rest(chain2),trans,Aproves,Bproves));
|
||||
if(id1 < id2)
|
||||
return cons_normal(f1,merge_normal_chains_rec(normal_rest(chain1),chain2,trans,Aproves,Bproves));
|
||||
if(id2 < id1)
|
||||
return cons_normal(f2,merge_normal_chains_rec(chain1,normal_rest(chain2),trans,Aproves,Bproves));
|
||||
ast rhs1 = normal_rhs(f1);
|
||||
ast rhs2 = normal_rhs(f2);
|
||||
LitType t1 = get_term_type(rhs1);
|
||||
|
@ -1719,9 +1854,13 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
Aproves = my_and(Aproves,mcB);
|
||||
ast rep = apply_rewrite_chain(rhs1,Aproof);
|
||||
new_proof = concat_rewrite_chain(pf1,Aproof);
|
||||
new_normal = make_normal_step(rhs1,rep,new_proof);
|
||||
new_normal = make_normal_step(lhs1,rep,new_proof);
|
||||
ast A_normal = make_normal_step(rhs1,rep,Aproof);
|
||||
ast res = cons_normal(new_normal,merge_normal_chains_rec(normal_rest(chain1),normal_rest(chain2),trans,Aproves,Bproves));
|
||||
res = merge_normal_chains_rec(res,cons_normal(A_normal,make(True)),trans,Aproves,Bproves);
|
||||
return res;
|
||||
}
|
||||
else if(t1 == LitA && t2 == LitB)
|
||||
else if(t1 == LitB && t2 == LitA)
|
||||
return merge_normal_chains_rec(chain2,chain1,trans,Aproves,Bproves);
|
||||
else if(t1 == LitA) {
|
||||
ast new_proof = concat_rewrite_chain(reverse_chain(pf1),pf2);
|
||||
|
@ -1743,17 +1882,20 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
return chain;
|
||||
ast f = normal_first(chain);
|
||||
ast r = normal_rest(chain);
|
||||
r = trans_normal_chain(r,trans);
|
||||
ast rhs = normal_rhs(f);
|
||||
hash_map<ast,ast>::iterator it = trans.find(rhs);
|
||||
ast new_normal;
|
||||
if(it != trans.end()){
|
||||
if(it != trans.end() && get_term_type(normal_lhs(f)) == LitMixed){
|
||||
const ast &f2 = it->second;
|
||||
ast pf = concat_rewrite_chain(normal_proof(f),normal_proof(f2));
|
||||
new_normal = make_normal_step(normal_lhs(f),normal_rhs(f2),pf);
|
||||
}
|
||||
else
|
||||
new_normal = f;
|
||||
return cons_normal(new_normal,trans_normal_chain(r,trans));
|
||||
if(get_term_type(normal_lhs(f)) == LitMixed)
|
||||
trans[normal_lhs(f)] = new_normal;
|
||||
return cons_normal(new_normal,r);
|
||||
}
|
||||
|
||||
ast merge_normal_chains(const ast &chain1, const ast &chain2, ast &Aproves, ast &Bproves){
|
||||
|
@ -2011,8 +2153,14 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
/** Make a Reflexivity node. This rule produces |- x = x */
|
||||
|
||||
virtual node make_reflexivity(ast con){
|
||||
throw proof_error();
|
||||
}
|
||||
if(get_term_type(con) == LitA)
|
||||
return mk_false();
|
||||
if(get_term_type(con) == LitB)
|
||||
return mk_true();
|
||||
ast itp = make(And,make(contra,no_proof,mk_false()),
|
||||
make(contra,mk_true(),mk_not(con)));
|
||||
return itp;
|
||||
}
|
||||
|
||||
/** Make a Symmetry node. This takes a derivation of |- x = y and
|
||||
produces | y = x. Ditto for ~(x=y) */
|
||||
|
@ -2247,10 +2395,19 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
throw proof_error();
|
||||
}
|
||||
}
|
||||
Qrhs = make(Times,c,Qrhs);
|
||||
#if 0
|
||||
bool pstrict = op(P) == Lt, strict = pstrict || qstrict;
|
||||
if(pstrict && qstrict && round_off)
|
||||
Qrhs = make(Sub,Qrhs,make_int(rational(1)));
|
||||
#else
|
||||
bool pstrict = op(P) == Lt;
|
||||
if(qstrict && round_off && (pstrict || !(c == make_int(rational(1))))){
|
||||
Qrhs = make(Sub,Qrhs,make_int(rational(1)));
|
||||
qstrict = false;
|
||||
}
|
||||
Qrhs = make(Times,c,Qrhs);
|
||||
bool strict = pstrict || qstrict;
|
||||
#endif
|
||||
if(strict)
|
||||
P = make(Lt,arg(P,0),make(Plus,arg(P,1),Qrhs));
|
||||
else
|
||||
|
@ -2269,8 +2426,14 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
itp = mk_true();
|
||||
break;
|
||||
default: { // mixed equality
|
||||
if(get_term_type(x) == LitMixed || get_term_type(y) == LitMixed)
|
||||
std::cerr << "WARNING: mixed term in leq2eq\n";
|
||||
if(get_term_type(x) == LitMixed || get_term_type(y) == LitMixed){
|
||||
// std::cerr << "WARNING: mixed term in leq2eq\n";
|
||||
std::vector<ast> lits;
|
||||
lits.push_back(con);
|
||||
lits.push_back(make(Not,xleqy));
|
||||
lits.push_back(make(Not,yleqx));
|
||||
return make_axiom(lits);
|
||||
}
|
||||
std::vector<ast> conjs; conjs.resize(3);
|
||||
conjs[0] = mk_not(con);
|
||||
conjs[1] = xleqy;
|
||||
|
@ -2405,7 +2568,15 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
frng = srng; // this term will be localized
|
||||
}
|
||||
else if(o == Plus || o == Times){ // don't want bound variables inside arith ops
|
||||
frng = erng; // this term will be localized
|
||||
// std::cout << "WARNING: non-local arithmetic\n";
|
||||
// frng = erng; // this term will be localized
|
||||
}
|
||||
else if(o == Select){ // treat the array term like a function symbol
|
||||
prover::range srng = pv->ast_scope(arg(e,0));
|
||||
if(!(srng.lo > srng.hi) && pv->ranges_intersect(srng,rng)) // localize to desired range if possible
|
||||
frng = pv->range_glb(srng,rng);
|
||||
else
|
||||
frng = srng; // this term will be localized
|
||||
}
|
||||
std::vector<ast> largs(nargs);
|
||||
std::vector<ast> eqs;
|
||||
|
@ -2434,7 +2605,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
|
|||
return e; // this term occurs in range, so it's O.K.
|
||||
|
||||
if(is_array_type(get_type(e)))
|
||||
throw "help!";
|
||||
std::cerr << "WARNING: array quantifier\n";
|
||||
|
||||
// choose a frame for the constraint that is close to range
|
||||
int frame = pv->range_near(pv->ast_scope(e),rng);
|
||||
|
|
|
@ -188,6 +188,15 @@ public:
|
|||
get_Z3_lits(con, lits);
|
||||
iproof->make_axiom(lits);
|
||||
}
|
||||
#ifdef LOCALIZATION_KLUDGE
|
||||
else if(dk == PR_MODUS_PONENS && pr(prem(proof,0)) == PR_QUANT_INST
|
||||
&& get_locality_rec(prem(proof,1)) == INT_MAX){
|
||||
std::vector<ast> lits;
|
||||
ast con = conc(proof);
|
||||
get_Z3_lits(con, lits);
|
||||
iproof->make_axiom(lits);
|
||||
}
|
||||
#endif
|
||||
else {
|
||||
unsigned nprems = num_prems(proof);
|
||||
for(unsigned i = 0; i < nprems; i++){
|
||||
|
@ -1271,6 +1280,84 @@ public:
|
|||
return make(Plus,args);
|
||||
}
|
||||
|
||||
|
||||
ast replace_summands_with_fresh_vars(const ast &t, hash_map<ast,ast> &map){
|
||||
if(op(t) == Plus){
|
||||
int nargs = num_args(t);
|
||||
std::vector<ast> args(nargs);
|
||||
for(int i = 0; i < nargs; i++)
|
||||
args[i] = replace_summands_with_fresh_vars(arg(t,i),map);
|
||||
return make(Plus,args);
|
||||
}
|
||||
if(op(t) == Times)
|
||||
return make(Times,arg(t,0),replace_summands_with_fresh_vars(arg(t,1),map));
|
||||
if(map.find(t) == map.end())
|
||||
map[t] = mk_fresh_constant("@s",get_type(t));
|
||||
return map[t];
|
||||
}
|
||||
|
||||
ast painfully_normalize_ineq(const ast &ineq, hash_map<ast,ast> &map){
|
||||
ast res = normalize_inequality(ineq);
|
||||
ast lhs = arg(res,0);
|
||||
lhs = replace_summands_with_fresh_vars(lhs,map);
|
||||
res = make(op(res),SortSum(lhs),arg(res,1));
|
||||
return res;
|
||||
}
|
||||
|
||||
Iproof::node painfully_reconstruct_farkas(const std::vector<ast> &prems, const std::vector<Iproof::node> &pfs, const ast &con){
|
||||
int nprems = prems.size();
|
||||
std::vector<ast> pcons(nprems),npcons(nprems);
|
||||
hash_map<ast,ast> pcon_to_pf, npcon_to_pcon, pain_map;
|
||||
for(int i = 0; i < nprems; i++){
|
||||
pcons[i] = conc(prems[i]);
|
||||
npcons[i] = painfully_normalize_ineq(pcons[i],pain_map);
|
||||
pcon_to_pf[npcons[i]] = pfs[i];
|
||||
npcon_to_pcon[npcons[i]] = pcons[i];
|
||||
}
|
||||
// ast leq = make(Leq,arg(con,0),arg(con,1));
|
||||
ast ncon = painfully_normalize_ineq(mk_not(con),pain_map);
|
||||
pcons.push_back(mk_not(con));
|
||||
npcons.push_back(ncon);
|
||||
// ast assumps = make(And,pcons);
|
||||
ast new_proof;
|
||||
if(is_sat(npcons,new_proof))
|
||||
throw "Proof error!";
|
||||
pfrule dk = pr(new_proof);
|
||||
int nnp = num_prems(new_proof);
|
||||
std::vector<Iproof::node> my_prems;
|
||||
std::vector<ast> farkas_coeffs, my_pcons;
|
||||
|
||||
if(dk == PR_TH_LEMMA
|
||||
&& get_theory_lemma_theory(new_proof) == ArithTheory
|
||||
&& get_theory_lemma_kind(new_proof) == FarkasKind)
|
||||
get_farkas_coeffs(new_proof,farkas_coeffs);
|
||||
else if(dk == PR_UNIT_RESOLUTION && nnp == 2){
|
||||
for(int i = 0; i < nprems; i++)
|
||||
farkas_coeffs.push_back(make_int(rational(1)));
|
||||
}
|
||||
else
|
||||
throw "cannot reconstruct farkas proof";
|
||||
|
||||
for(int i = 0; i < nnp; i++){
|
||||
ast p = conc(prem(new_proof,i));
|
||||
p = really_normalize_ineq(p);
|
||||
if(pcon_to_pf.find(p) != pcon_to_pf.end()){
|
||||
my_prems.push_back(pcon_to_pf[p]);
|
||||
my_pcons.push_back(npcon_to_pcon[p]);
|
||||
}
|
||||
else if(p == ncon){
|
||||
my_prems.push_back(iproof->make_hypothesis(mk_not(con)));
|
||||
my_pcons.push_back(mk_not(con));
|
||||
}
|
||||
else
|
||||
throw "cannot reconstruct farkas proof";
|
||||
}
|
||||
Iproof::node res = iproof->make_farkas(mk_false(),my_prems,my_pcons,farkas_coeffs);
|
||||
return res;
|
||||
}
|
||||
|
||||
|
||||
|
||||
ast really_normalize_ineq(const ast &ineq){
|
||||
ast res = normalize_inequality(ineq);
|
||||
res = make(op(res),SortSum(arg(res,0)),arg(res,1));
|
||||
|
@ -1309,7 +1396,7 @@ public:
|
|||
farkas_coeffs.push_back(make_int(rational(1)));
|
||||
}
|
||||
else
|
||||
throw "cannot reconstruct farkas proof";
|
||||
return painfully_reconstruct_farkas(prems,pfs,con);
|
||||
|
||||
for(int i = 0; i < nnp; i++){
|
||||
ast p = conc(prem(new_proof,i));
|
||||
|
@ -1452,9 +1539,11 @@ public:
|
|||
lits.push_back(from_ast(con));
|
||||
|
||||
// pattern match some idioms
|
||||
if(dk == PR_MODUS_PONENS && pr(prem(proof,0)) == PR_QUANT_INST && pr(prem(proof,1)) == PR_REWRITE ) {
|
||||
res = iproof->make_axiom(lits);
|
||||
return res;
|
||||
if(dk == PR_MODUS_PONENS && pr(prem(proof,0)) == PR_QUANT_INST){
|
||||
if(get_locality_rec(prem(proof,1)) == INT_MAX) {
|
||||
res = iproof->make_axiom(lits);
|
||||
return res;
|
||||
}
|
||||
}
|
||||
if(dk == PR_MODUS_PONENS && expect_clause && op(con) == Or){
|
||||
Iproof::node clause = translate_main(prem(proof,0),true);
|
||||
|
@ -1465,12 +1554,20 @@ public:
|
|||
if(dk == PR_MODUS_PONENS && expect_clause && op(con) == Or)
|
||||
std::cout << "foo!\n";
|
||||
|
||||
#if 0
|
||||
if(1 && dk == PR_TRANSITIVITY && pr(prem(proof,1)) == PR_COMMUTATIVITY){
|
||||
Iproof::node clause = translate_main(prem(proof,0),true);
|
||||
res = make(commute,clause,conc(prem(proof,0))); // HACK -- we depend on Iproof::node being same as ast.
|
||||
return res;
|
||||
}
|
||||
|
||||
if(1 && dk == PR_TRANSITIVITY && pr(prem(proof,0)) == PR_COMMUTATIVITY){
|
||||
Iproof::node clause = translate_main(prem(proof,1),true);
|
||||
res = make(commute,clause,conc(prem(proof,1))); // HACK -- we depend on Iproof::node being same as ast.
|
||||
return res;
|
||||
}
|
||||
#endif
|
||||
|
||||
if(dk == PR_TRANSITIVITY && is_eq_propagate(prem(proof,1))){
|
||||
try {
|
||||
res = CombineEqPropagate(proof);
|
||||
|
@ -1627,9 +1724,10 @@ public:
|
|||
break;
|
||||
case ArrayTheory: {// nothing fancy for this
|
||||
ast store_array;
|
||||
if(!get_store_array(con,store_array))
|
||||
throw unsupported();
|
||||
res = iproof->make_axiom(lits,ast_scope(store_array));
|
||||
if(get_store_array(con,store_array))
|
||||
res = iproof->make_axiom(lits,ast_scope(store_array));
|
||||
else
|
||||
res = iproof->make_axiom(lits); // for array extensionality axiom
|
||||
break;
|
||||
}
|
||||
default:
|
||||
|
@ -1653,6 +1751,12 @@ public:
|
|||
res = args[0];
|
||||
break;
|
||||
}
|
||||
case PR_COMMUTATIVITY: {
|
||||
ast comm_equiv = make(op(con),arg(con,0),arg(con,0));
|
||||
ast pf = iproof->make_reflexivity(comm_equiv);
|
||||
res = make(commute,pf,comm_equiv);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
assert(0 && "translate_main: unsupported proof rule");
|
||||
throw unsupported();
|
||||
|
|
0
src/muz/duality/duality_dl_interface.cpp
Normal file → Executable file
0
src/muz/duality/duality_dl_interface.cpp
Normal file → Executable file
Loading…
Reference in a new issue