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tune consequence finding. Factor solver pretty-printing as SMT-LIB into top-level

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-08-03 11:14:29 -07:00
parent cb2d8d2107
commit 491b3b34aa
15 changed files with 149 additions and 69 deletions
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15
src/smt/smt_conflict_resolution.cpp
View file

@ -187,6 +187,10 @@ namespace smt {
SASSERT(m_todo_js_qhead <= m_todo_js.size());
m_antecedents = &result;
mark_justification(js);
process_justifications();
}
void conflict_resolution::process_justifications() {
while (true) {
unsigned sz = m_todo_js.size();
while (m_todo_js_qhead < sz) {
@ -234,6 +238,17 @@ namespace smt {
SASSERT(m_todo_eqs.empty());
}
void conflict_resolution::eq2literals(enode* n1, enode* n2, literal_vector & result) {
SASSERT(m_todo_js.empty());
SASSERT(m_todo_js_qhead == 0);
SASSERT(m_todo_eqs.empty());
m_antecedents = &result;
m_todo_eqs.push_back(enode_pair(n1, n2));
process_justifications();
unmark_justifications(0);
SASSERT(m_todo_eqs.empty());
}
/**
\brief Return maximum scope level of an antecedent literal of js.
*/

3
src/smt/smt_conflict_resolution.h
View file

@ -168,6 +168,7 @@ namespace smt {
void eq_branch2literals(enode * n1, enode * n2);
void eq2literals(enode * n1, enode * n2);
void justification2literals_core(justification * js, literal_vector & result) ;
void process_justifications();
void unmark_justifications(unsigned old_js_qhead);
literal_vector m_tmp_literal_vector;
@ -257,6 +258,8 @@ namespace smt {
void justification2literals(justification * js, literal_vector & result);
void eq2literals(enode * n1, enode * n2, literal_vector & result);
};
inline void mark_literals(conflict_resolution & cr, unsigned sz, literal const * ls) {

91
src/smt/smt_consequences.cpp
View file

@ -102,7 +102,7 @@ namespace smt {
}
}
void context::delete_unfixed(obj_map<expr, expr*>& var2val) {
unsigned context::delete_unfixed(obj_map<expr, expr*>& var2val, expr_ref_vector& unfixed) {
ast_manager& m = m_manager;
ptr_vector<expr> to_delete;
obj_map<expr,expr*>::iterator it = var2val.begin(), end = var2val.end();
@ -137,14 +137,59 @@ namespace smt {
to_delete.push_back(k);
}
}
IF_VERBOSE(1, verbose_stream() << "(get-consequences deleting: " << to_delete.size() << " num-values: " << var2val.size() << ")\n";);
for (unsigned i = 0; i < to_delete.size(); ++i) {
var2val.remove(to_delete[i]);
unfixed.push_back(to_delete[i]);
}
return to_delete.size();
}
//
// Extract equalities that are congruent at the search level.
//
unsigned context::extract_fixed_eqs(obj_map<expr, expr*>& var2val, expr_ref_vector& conseq) {
ast_manager& m = m_manager;
ptr_vector<expr> to_delete;
expr_ref fml(m), eq(m);
obj_map<expr,expr*>::iterator it = var2val.begin(), end = var2val.end();
for (; it != end; ++it) {
expr* k = it->m_key;
expr* v = it->m_value;
if (!m.is_bool(k) && e_internalized(k) && e_internalized(v) &&
get_enode(k)->get_root() == get_enode(v)->get_root()) {
literal_vector literals;
m_conflict_resolution->eq2literals(get_enode(v), get_enode(k), literals);
uint_set s;
for (unsigned i = 0; i < literals.size(); ++i) {
SASSERT(get_assign_level(literals[i]) <= get_search_level());
s |= m_antecedents.find(literals[i].var());
}
fml = m.mk_eq(k, v);
fml = m.mk_implies(antecedent2fml(s), fml);
conseq.push_back(fml);
to_delete.push_back(k);
for (unsigned i = 0; i < literals.size(); ++i) {
literals[i].neg();
}
eq = mk_eq_atom(k, v);
internalize_formula(eq, false);
literal lit(get_bool_var(eq), true);
literals.push_back(lit);
mk_clause(literals.size(), literals.c_ptr(), 0);
}
}
for (unsigned i = 0; i < to_delete.size(); ++i) {
var2val.remove(to_delete[i]);
}
return to_delete.size();
}
lbool context::get_consequences(expr_ref_vector const& assumptions,
expr_ref_vector const& vars, expr_ref_vector& conseq) {
expr_ref_vector const& vars,
expr_ref_vector& conseq,
expr_ref_vector& unfixed) {
m_antecedents.reset();
lbool is_sat = check(assumptions.size(), assumptions.c_ptr());
@ -168,6 +213,9 @@ namespace smt {
trail.push_back(val);
var2val.insert(vars[i], val);
}
else {
unfixed.push_back(vars[i]);
}
}
extract_fixed_consequences(0, var2val, _assumptions, conseq);
unsigned num_units = assigned_literals().size();
@ -178,8 +226,10 @@ namespace smt {
m_case_split_queue->init_search_eh();
unsigned num_iterations = 0;
unsigned model_threshold = 2;
unsigned num_unfixed = 0;
unsigned num_fixed_eqs = 0;
unsigned num_reiterations = 0;
while (!var2val.empty()) {
++num_iterations;
obj_map<expr,expr*>::iterator it = var2val.begin();
expr* e = it->m_key;
expr* val = it->m_value;
@ -212,28 +262,50 @@ namespace smt {
}
if (get_assignment(lit) == l_true) {
var2val.erase(e);
unfixed.push_back(e);
}
else if (get_assign_level(lit) > get_search_level()) {
TRACE("context", tout << "Retry fixing: " << mk_pp(e, m) << "\n";);
pop_to_search_lvl();
++num_reiterations;
continue;
}
else {
TRACE("context", tout << "Fixed: " << mk_pp(e, m) << "\n";);
}
++num_iterations;
TRACE("context", tout << "Unfixed variables: " << var2val.size() << "\n";);
if (model_threshold <= num_iterations) {
delete_unfixed(var2val);
bool apply_slow_pass = model_threshold <= num_iterations || num_iterations <= 2;
if (apply_slow_pass) {
num_unfixed += delete_unfixed(var2val, unfixed);
// The next time we check the model is after 1.5 additional iterations.
model_threshold *= 3;
model_threshold /= 2;
model_threshold /= 2;
}
// repeat until we either have a model with negated literal or
// the literal is implied at base.
extract_fixed_consequences(num_units, var2val, _assumptions, conseq);
num_units = assigned_literals().size();
if (apply_slow_pass) {
num_fixed_eqs += extract_fixed_eqs(var2val, conseq);
IF_VERBOSE(1, verbose_stream() << "(get-consequences"
<< " iterations: " << num_iterations
<< " variables: " << var2val.size()
<< " fixed: " << conseq.size()
<< " unfixed: " << unfixed.size()
<< " fixed-eqs: " << num_fixed_eqs
<< " unfixed-deleted: " << num_unfixed
<< ")\n";);
TRACE("context", tout << "(get-consequences"
<< " iterations: " << num_iterations
<< " variables: " << var2val.size()
<< " fixed: " << conseq.size()
<< " unfixed: " << unfixed.size()
<< " fixed-eqs: " << num_fixed_eqs
<< " unfixed-deleted: " << num_unfixed
<< ")\n";);
}
if (var2val.contains(e)) {
TRACE("context", tout << "Fixed value to " << mk_pp(e, m) << " was not processed\n";);
expr_ref fml(m);
@ -242,8 +314,7 @@ namespace smt {
conseq.push_back(fml);
var2val.erase(e);
SASSERT(get_assignment(lit) == l_false);
}
}
}
end_search();
return l_true;

1
src/smt/smt_context.cpp
View file

@ -3422,7 +3422,6 @@ namespace smt {
}
lbool context::bounded_search() {
SASSERT(!inconsistent());
unsigned counter = 0;
TRACE("bounded_search", tout << "starting bounded search...\n";);

6
src/smt/smt_context.h
View file

@ -1347,7 +1347,9 @@ namespace smt {
u_map<uint_set> m_antecedents;
void extract_fixed_consequences(unsigned idx, obj_map<expr, expr*>& var2val, uint_set const& assumptions, expr_ref_vector& conseq);
void delete_unfixed(obj_map<expr, expr*>& var2val);
unsigned delete_unfixed(obj_map<expr, expr*>& var2val, expr_ref_vector& unfixed);
unsigned extract_fixed_eqs(obj_map<expr, expr*>& var2val, expr_ref_vector& conseq);
expr_ref antecedent2fml(uint_set const& ante);
@ -1391,7 +1393,7 @@ namespace smt {
lbool check(unsigned num_assumptions = 0, expr * const * assumptions = 0, bool reset_cancel = true);
lbool get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq);
lbool get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq, expr_ref_vector& unfixed);
lbool setup_and_check(bool reset_cancel = true);

32
src/smt/smt_kernel.cpp
View file

@ -55,6 +55,18 @@ namespace smt {
void set_progress_callback(progress_callback * callback) {
return m_kernel.set_progress_callback(callback);
}
void display(std::ostream & out) const {
// m_kernel.display(out); <<< for external users it is just junk
// TODO: it will be replaced with assertion_stack.display
unsigned num = m_kernel.get_num_asserted_formulas();
expr * const * fms = m_kernel.get_asserted_formulas();
out << "(kernel";
for (unsigned i = 0; i < num; i++) {
out << "\n " << mk_ismt2_pp(fms[i], m(), 2);
}
out << ")";
}
void assert_expr(expr * e) {
TRACE("smt_kernel", tout << "assert:\n" << mk_ismt2_pp(e, m()) << "\n";);
@ -99,8 +111,8 @@ namespace smt {
return m_kernel.check(num_assumptions, assumptions);
}
lbool get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq) {
return m_kernel.get_consequences(assumptions, vars, conseq);
lbool get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq, expr_ref_vector& unfixed) {
return m_kernel.get_consequences(assumptions, vars, conseq, unfixed);
}
void get_model(model_ref & m) const {
@ -150,18 +162,6 @@ namespace smt {
void get_guessed_literals(expr_ref_vector & result) {
m_kernel.get_guessed_literals(result);
}
void display(std::ostream & out) const {
// m_kernel.display(out); <<< for external users it is just junk
// TODO: it will be replaced with assertion_stack.display
unsigned num = m_kernel.get_num_asserted_formulas();
expr * const * fms = m_kernel.get_asserted_formulas();
out << "(kernel";
for (unsigned i = 0; i < num; i++) {
out << "\n " << mk_ismt2_pp(fms[i], m(), 2);
}
out << ")";
}
void collect_statistics(::statistics & st) const {
m_kernel.collect_statistics(st);
@ -268,8 +268,8 @@ namespace smt {
return r;
}
lbool kernel::get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq) {
return m_imp->get_consequences(assumptions, vars, conseq);
lbool kernel::get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq, expr_ref_vector& unfixed) {
return m_imp->get_consequences(assumptions, vars, conseq, unfixed);
}
void kernel::get_model(model_ref & m) const {

3
src/smt/smt_kernel.h
View file

@ -129,7 +129,8 @@ namespace smt {
/**
\brief extract consequences among variables.
*/
lbool get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq);
lbool get_consequences(expr_ref_vector const& assumptions, expr_ref_vector const& vars,
expr_ref_vector& conseq, expr_ref_vector& unfixed);
/**
\brief Return the model associated with the last check command.

16
src/smt/smt_solver.cpp
View file

@ -23,6 +23,7 @@ Notes:
#include"smt_params_helper.hpp"
#include"mus.h"
namespace smt {
class solver : public solver_na2as {
@ -68,7 +69,8 @@ namespace smt {
}
virtual lbool get_consequences_core(expr_ref_vector const& assumptions, expr_ref_vector const& vars, expr_ref_vector& conseq) {
return m_context.get_consequences(assumptions, vars, conseq);
expr_ref_vector unfixed(m_context.m());
return m_context.get_consequences(assumptions, vars, conseq, unfixed);
}
virtual void assert_expr(expr * t) {
@ -143,8 +145,7 @@ namespace smt {
r.append(tmp.size(), tmp.c_ptr());
}
virtual ast_manager& get_manager() { return m_context.m(); }
virtual ast_manager& get_manager() const { return m_context.m(); }
virtual void set_progress_callback(progress_callback * callback) {
m_callback = callback;
@ -158,15 +159,8 @@ namespace smt {
virtual expr * get_assertion(unsigned idx) const {
SASSERT(idx < get_num_assertions());
return m_context.get_formulas()[idx];
}
virtual std::ostream& display(std::ostream & out) const {
m_context.display(out);
return out;
}
}
};
};
solver * mk_smt_solver(ast_manager & m, params_ref const & p, symbol const & logic) {