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z3/lib/th_rewriter.cpp
Leonardo de Moura e9eab22e5c Z3 sources 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
2012-10-02 11:35:25 -07:00

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/*++
Copyright (c) 2011 Microsoft Corporation
Module Name:
th_rewriter.h
Abstract:
Rewriter for applying all builtin (cheap) theory rewrite rules.
Author:
Leonardo (leonardo) 2011-04-07
Notes:
--*/
#include"th_rewriter.h"
#include"bool_rewriter.h"
#include"arith_rewriter.h"
#include"bv_rewriter.h"
#include"datatype_rewriter.h"
#include"array_rewriter.h"
#include"float_rewriter.h"
#include"dl_rewriter.h"
#include"rewriter_def.h"
#include"expr_substitution.h"
#include"ast_smt2_pp.h"
#include"cooperate.h"
#include"var_subst.h"
#include"ast_util.h"
#include"well_sorted.h"
struct th_rewriter_cfg : public default_rewriter_cfg {
bool_rewriter m_b_rw;
arith_rewriter m_a_rw;
bv_rewriter m_bv_rw;
array_rewriter m_ar_rw;
datatype_rewriter m_dt_rw;
float_rewriter m_f_rw;
dl_rewriter m_dl_rw;
arith_util m_a_util;
bv_util m_bv_util;
unsigned long long m_max_memory; // in bytes
unsigned m_max_steps;
bool m_pull_cheap_ite;
bool m_flat;
bool m_cache_all;
bool m_push_ite_arith;
bool m_push_ite_bv;
// substitution support
expr_dependency_ref m_used_dependencies; // set of dependencies of used substitutions
expr_substitution * m_subst;
ast_manager & m() const { return m_b_rw.m(); }
void updt_local_params(params_ref const & p) {
m_flat = p.get_bool(":flat", true);
m_max_memory = megabytes_to_bytes(p.get_uint(":max-memory", UINT_MAX));
m_max_steps = p.get_uint(":max-steps", UINT_MAX);
m_pull_cheap_ite = p.get_bool(":pull-cheap-ite", false);
m_cache_all = p.get_bool(":cache-all", false);
m_push_ite_arith = p.get_bool(":push-ite-arith", false);
m_push_ite_bv = p.get_bool(":push-ite-bv", false);
}
void updt_params(params_ref const & p) {
m_b_rw.updt_params(p);
m_a_rw.updt_params(p);
m_bv_rw.updt_params(p);
m_ar_rw.updt_params(p);
updt_local_params(p);
}
bool flat_assoc(func_decl * f) const {
if (!m_flat) return false;
family_id fid = f->get_family_id();
if (fid == null_family_id)
return false;
decl_kind k = f->get_decl_kind();
if (fid == m_b_rw.get_fid())
return k == OP_AND || k == OP_OR;
if (fid == m_a_rw.get_fid())
return k == OP_ADD;
if (fid == m_bv_rw.get_fid())
return k == OP_BADD || k == OP_BOR || k == OP_BAND || k == OP_BXOR;
return false;
}
bool rewrite_patterns() const { return false; }
bool cache_all_results() const { return m_cache_all; }
bool max_steps_exceeded(unsigned num_steps) const {
cooperate("simplifier");
if (memory::get_allocation_size() > m_max_memory)
throw rewriter_exception(TACTIC_MAX_MEMORY_MSG);
return num_steps > m_max_steps;
}
// Return true if t is of the form
// (= t #b0)
// (= t #b1)
// (= #b0 t)
// (= #b1 t)
bool is_eq_bit(expr * t, expr * & x, unsigned & val) {
if (!m().is_eq(t))
return false;
expr * lhs = to_app(t)->get_arg(0);
if (!m_bv_rw.is_bv(lhs))
return false;
if (m_bv_rw.get_bv_size(lhs) != 1)
return false;
expr * rhs = to_app(t)->get_arg(1);
rational v;
unsigned sz;
if (m_bv_rw.is_numeral(lhs, v, sz)) {
x = rhs;
val = v.get_unsigned();
SASSERT(val == 0 || val == 1);
return true;
}
if (m_bv_rw.is_numeral(rhs, v, sz)) {
x = lhs;
val = v.get_unsigned();
SASSERT(val == 0 || val == 1);
return true;
}
return false;
}
// (iff (= x bit1) A)
// --->
// (= x (ite A bit1 bit0))
br_status apply_tamagotchi(expr * lhs, expr * rhs, expr_ref & result) {
expr * x;
unsigned val;
if (is_eq_bit(lhs, x, val)) {
result = m().mk_eq(x, m().mk_ite(rhs, m_bv_rw.mk_numeral(val, 1), m_bv_rw.mk_numeral(1-val, 1)));
return BR_REWRITE2;
}
if (is_eq_bit(rhs, x, val)) {
result = m().mk_eq(x, m().mk_ite(lhs, m_bv_rw.mk_numeral(val, 1), m_bv_rw.mk_numeral(1-val, 1)));
return BR_REWRITE2;
}
return BR_FAILED;
}
br_status reduce_app_core(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
family_id fid = f->get_family_id();
if (fid == null_family_id)
return BR_FAILED;
br_status st = BR_FAILED;
if (fid == m_b_rw.get_fid()) {
decl_kind k = f->get_decl_kind();
if (k == OP_EQ) {
// theory dispatch for =
SASSERT(num == 2);
family_id s_fid = m().get_sort(args[0])->get_family_id();
if (s_fid == m_a_rw.get_fid())
st = m_a_rw.mk_eq_core(args[0], args[1], result);
else if (s_fid == m_bv_rw.get_fid())
st = m_bv_rw.mk_eq_core(args[0], args[1], result);
else if (s_fid == m_dt_rw.get_fid())
st = m_dt_rw.mk_eq_core(args[0], args[1], result);
else if (s_fid == m_f_rw.get_fid())
st = m_f_rw.mk_eq_core(args[0], args[1], result);
if (st != BR_FAILED)
return st;
}
if (k == OP_EQ || k == OP_IFF) {
SASSERT(num == 2);
st = apply_tamagotchi(args[0], args[1], result);
if (st != BR_FAILED)
return st;
}
return m_b_rw.mk_app_core(f, num, args, result);
}
if (fid == m_a_rw.get_fid())
return m_a_rw.mk_app_core(f, num, args, result);
if (fid == m_bv_rw.get_fid())
return m_bv_rw.mk_app_core(f, num, args, result);
if (fid == m_ar_rw.get_fid())
return m_ar_rw.mk_app_core(f, num, args, result);
if (fid == m_dt_rw.get_fid())
return m_dt_rw.mk_app_core(f, num, args, result);
if (fid == m_f_rw.get_fid())
return m_f_rw.mk_app_core(f, num, args, result);
if (fid == m_dl_rw.get_fid())
return m_dl_rw.mk_app_core(f, num, args, result);
return BR_FAILED;
}
// auxiliary function for pull_ite_core
expr * mk_eq_value(expr * lhs, expr * value) {
SASSERT(m().is_value(value));
if (m().is_value(lhs)) {
return lhs == value ? m().mk_true() : m().mk_false();
}
return m().mk_eq(lhs, value);
}
template<bool SWAP>
br_status pull_ite_core(func_decl * p, app * ite, app * value, expr_ref & result) {
if (m().is_eq(p)) {
result = m().mk_ite(ite->get_arg(0),
mk_eq_value(ite->get_arg(1), value),
mk_eq_value(ite->get_arg(2), value));
return BR_REWRITE2;
}
else {
if (SWAP) {
result = m().mk_ite(ite->get_arg(0),
m().mk_app(p, value, ite->get_arg(1)),
m().mk_app(p, value, ite->get_arg(2)));
return BR_REWRITE2;
}
else {
result = m().mk_ite(ite->get_arg(0),
m().mk_app(p, ite->get_arg(1), value),
m().mk_app(p, ite->get_arg(2), value));
return BR_REWRITE2;
}
}
}
// Return true if t is an ite-value-tree form defined as:
// ite-value-tree := (ite c <subtree> <subtree>)
// subtree := value
// | (ite c <subtree> <subtree>)
//
bool is_ite_value_tree(expr * t) {
if (!m().is_ite(t))
return false;
ptr_buffer<app> todo;
todo.push_back(to_app(t));
while (!todo.empty()) {
app * ite = todo.back();
todo.pop_back();
expr * arg1 = ite->get_arg(1);
expr * arg2 = ite->get_arg(2);
if (m().is_ite(arg1) && arg1->get_ref_count() == 1) // do not apply on shared terms, since it may blowup
todo.push_back(to_app(arg1));
else if (!m().is_value(arg1))
return false;
if (m().is_ite(arg2) && arg2->get_ref_count() == 1) // do not apply on shared terms, since it may blowup
todo.push_back(to_app(arg2));
else if (!m().is_value(arg2))
return false;
}
return true;
}
br_status pull_ite(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
if (num == 2 && m().is_bool(f->get_range()) && !m().is_bool(args[0])) {
if (m().is_ite(args[0])) {
if (m().is_value(args[1]))
return pull_ite_core<false>(f, to_app(args[0]), to_app(args[1]), result);
if (m().is_ite(args[1]) && to_app(args[0])->get_arg(0) == to_app(args[1])->get_arg(0)) {
// (p (ite C A1 B1) (ite C A2 B2)) --> (ite (p A1 A2) (p B1 B2))
result = m().mk_ite(to_app(args[0])->get_arg(0),
m().mk_app(f, to_app(args[0])->get_arg(1), to_app(args[1])->get_arg(1)),
m().mk_app(f, to_app(args[0])->get_arg(2), to_app(args[1])->get_arg(2)));
return BR_REWRITE2;
}
}
if (m().is_ite(args[1]) && m().is_value(args[0]))
return pull_ite_core<true>(f, to_app(args[1]), to_app(args[0]), result);
}
family_id fid = f->get_family_id();
if (num == 2 && (fid == m().get_basic_family_id() || fid == m_a_rw.get_fid() || fid == m_bv_rw.get_fid())) {
// (f v3 (ite c v1 v2)) --> (ite v (f v3 v1) (f v3 v2))
if (m().is_value(args[0]) && is_ite_value_tree(args[1]))
return pull_ite_core<true>(f, to_app(args[1]), to_app(args[0]), result);
// (f (ite c v1 v2) v3) --> (ite v (f v1 v3) (f v2 v3))
if (m().is_value(args[1]) && is_ite_value_tree(args[0]))
return pull_ite_core<false>(f, to_app(args[0]), to_app(args[1]), result);
}
return BR_FAILED;
}
br_status pull_ite(expr_ref & result) {
expr * t = result.get();
if (is_app(t)) {
br_status st = pull_ite(to_app(t)->get_decl(), to_app(t)->get_num_args(), to_app(t)->get_args(), result);
if (st != BR_FAILED)
return st;
}
return BR_DONE;
}
bool is_arith_bv_app(expr * t) const {
if (!is_app(t))
return false;
family_id fid = to_app(t)->get_family_id();
return ((fid == m_a_rw.get_fid() && m_push_ite_arith) ||
(fid == m_bv_rw.get_fid() && m_push_ite_bv));
}
bool get_neutral_elem(app * t, expr_ref & n) {
family_id fid = t->get_family_id();
if (fid == m_a_rw.get_fid()) {
switch (t->get_decl_kind()) {
case OP_ADD: n = m_a_util.mk_numeral(rational(0), m().get_sort(t)); return true;
case OP_MUL: n = m_a_util.mk_numeral(rational(1), m().get_sort(t)); return true;
default:
return false;
}
}
if (fid == m_bv_rw.get_fid()) {
switch (t->get_decl_kind()) {
case OP_BADD: n = m_bv_util.mk_numeral(rational(0), m().get_sort(t)); return true;
case OP_BMUL: n = m_bv_util.mk_numeral(rational(1), m().get_sort(t)); return true;
default:
return false;
}
}
return false;
}
/**
\brief Try to "unify" t1 and t2
Examples
(+ 2 a) (+ 3 a) --> 2, 3, a
(+ 2 a) a --> 2, 0, a
...
*/
bool unify_core(app * t1, expr * t2, expr_ref & new_t1, expr_ref & new_t2, expr_ref & c, bool & first) {
if (t1->get_num_args() != 2)
return false;
expr * a1 = t1->get_arg(0);
expr * b1 = t1->get_arg(1);
if (t2 == b1) {
if (get_neutral_elem(t1, new_t2)) {
new_t1 = a1;
c = b1;
first = false;
return true;
}
}
else if (t2 == a1) {
if (get_neutral_elem(t1, new_t2)) {
new_t1 = b1;
c = a1;
first = true;
return true;
}
}
else if (is_app_of(t2, t1->get_decl()) && to_app(t2)->get_num_args() == 2) {
expr * a2 = to_app(t2)->get_arg(0);
expr * b2 = to_app(t2)->get_arg(1);
if (b1 == b2) {
new_t1 = a1;
new_t2 = a2;
c = b2;
first = false;
return true;
}
if (a1 == a2) {
new_t1 = b1;
new_t2 = b2;
c = a1;
first = true;
return true;
}
if (t1->get_decl()->is_commutative()) {
if (a1 == b2) {
new_t1 = b1;
new_t2 = a2;
c = a1;
first = true; // doesn't really matter for commutative ops.
return true;
}
if (b1 == a2) {
new_t1 = a1;
new_t2 = b2;
c = b1;
first = false; // doesn't really matter for commutative ops.
return true;
}
}
}
return false;
}
// Return true if t1 and t2 are of the form:
// t + a1*x1 + ... + an*xn
// t' + a1*x1 + ... + an*xn
// Store t in new_t1, t' in new_t2 and (a1*x1 + ... + an*xn) in c.
bool unify_add(app * t1, expr * t2, expr_ref & new_t1, expr_ref & new_t2, expr_ref & c) {
unsigned num1 = t1->get_num_args();
expr * const * ms1 = t1->get_args();
if (num1 < 2)
return false;
unsigned num2;
expr * const * ms2;
if (m_a_util.is_add(t2)) {
num2 = to_app(t2)->get_num_args();
ms2 = to_app(t2)->get_args();
}
else {
num2 = 1;
ms2 = &t2;
}
if (num1 != num2 && num1 != num2 + 1 && num1 != num2 - 1)
return false;
new_t1 = 0;
new_t2 = 0;
expr_fast_mark1 visited1;
expr_fast_mark2 visited2;
for (unsigned i = 0; i < num1; i++) {
expr * arg = ms1[i];
visited1.mark(arg);
}
for (unsigned i = 0; i < num2; i++) {
expr * arg = ms2[i];
visited2.mark(arg);
if (visited1.is_marked(arg))
continue;
if (new_t2)
return false; // more than one missing term
new_t2 = arg;
}
for (unsigned i = 0; i < num1; i++) {
expr * arg = ms1[i];
if (visited2.is_marked(arg))
continue;
if (new_t1)
return false; // more than one missing term
new_t1 = arg;
}
// terms matched...
bool is_int = m_a_util.is_int(t1);
if (!new_t1)
new_t1 = m_a_util.mk_numeral(rational(0), is_int);
if (!new_t2)
new_t2 = m_a_util.mk_numeral(rational(0), is_int);
// mk common part
ptr_buffer<expr> args;
for (unsigned i = 0; i < num1; i++) {
expr * arg = ms1[i];
if (arg == new_t1.get())
continue;
args.push_back(arg);
}
SASSERT(!args.empty());
if (args.size() == 1)
c = args[0];
else
c = m_a_util.mk_add(args.size(), args.c_ptr());
return true;
}
bool unify(expr * t1, expr * t2, func_decl * & f, expr_ref & new_t1, expr_ref & new_t2, expr_ref & c, bool & first) {
#if 0
// Did not work for ring benchmarks
// Hack for handling more complex cases of + apps
// such as (+ 2 t1 t2 t3) and (+ 3 t3 t2 t1)
if (m_a_util.is_add(t1)) {
first = true; // doesn't matter for AC ops
f = to_app(t1)->get_decl();
if (unify_add(to_app(t1), t2, new_t1, new_t2, c))
return true;
}
if (m_a_util.is_add(t2)) {
first = true; // doesn't matter for AC ops
f = to_app(t2)->get_decl();
if (unify_add(to_app(t2), t1, new_t2, new_t1, c))
return true;
}
#endif
if (is_arith_bv_app(t1)) {
f = to_app(t1)->get_decl();
return unify_core(to_app(t1), t2, new_t1, new_t2, c, first);
}
else {
f = to_app(t2)->get_decl();
return unify_core(to_app(t2), t1, new_t2, new_t1, c, first);
}
}
// Apply transformations of the form
//
// (ite c (+ k1 a) (+ k2 a)) --> (+ (ite c k1 k2) a)
// (ite c (* k1 a) (* k2 a)) --> (* (ite c k1 k2) a)
//
// These transformations are useful for bit-vector problems, since
// they will minimize the number of adders/multipliers/etc
br_status push_ite(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
if (!m().is_ite(f))
return BR_FAILED;
expr * c = args[0];
expr * t = args[1];
expr * e = args[2];
func_decl * f_prime = 0;
expr_ref new_t(m()), new_e(m()), common(m());
bool first;
TRACE("push_ite", tout << "unifying:\n" << mk_ismt2_pp(t, m()) << "\n" << mk_ismt2_pp(e, m()) << "\n";);
if (unify(t, e, f_prime, new_t, new_e, common, first)) {
if (first)
result = m().mk_app(f_prime, common, m().mk_ite(c, new_t, new_e));
else
result = m().mk_app(f_prime, m().mk_ite(c, new_t, new_e), common);
return BR_DONE;
}
TRACE("push_ite", tout << "failed\n";);
return BR_FAILED;
}
br_status push_ite(expr_ref & result) {
expr * t = result.get();
if (m().is_ite(t)) {
br_status st = push_ite(to_app(t)->get_decl(), to_app(t)->get_num_args(), to_app(t)->get_args(), result);
if (st != BR_FAILED)
return st;
}
return BR_DONE;
}
br_status reduce_app(func_decl * f, unsigned num, expr * const * args, expr_ref & result, proof_ref & result_pr) {
result_pr = 0;
br_status st = reduce_app_core(f, num, args, result);
if (st != BR_DONE && st != BR_FAILED) {
CTRACE("th_rewriter_step", st != BR_FAILED,
tout << f->get_name() << "\n";
for (unsigned i = 0; i < num; i++) tout << mk_ismt2_pp(args[i], m()) << "\n";
tout << "---------->\n" << mk_ismt2_pp(result, m()) << "\n";);
return st;
}
if (m_push_ite_bv || m_push_ite_arith) {
if (st == BR_FAILED)
st = push_ite(f, num, args, result);
else
st = push_ite(result);
}
if (m_pull_cheap_ite) {
if (st == BR_FAILED)
st = pull_ite(f, num, args, result);
else
st = pull_ite(result);
}
CTRACE("th_rewriter_step", st != BR_FAILED,
tout << f->get_name() << "\n";
for (unsigned i = 0; i < num; i++) tout << mk_ismt2_pp(args[i], m()) << "\n";
tout << "---------->\n" << mk_ismt2_pp(result, m()) << "\n";);
return st;
}
bool reduce_quantifier(quantifier * old_q,
expr * new_body,
expr * const * new_patterns,
expr * const * new_no_patterns,
expr_ref & result,
proof_ref & result_pr) {
quantifier_ref q1(m());
proof * p1 = 0;
if (is_quantifier(new_body) &&
to_quantifier(new_body)->is_forall() == old_q->is_forall() &&
!old_q->has_patterns() &&
!to_quantifier(new_body)->has_patterns()) {
quantifier * nested_q = to_quantifier(new_body);
ptr_buffer<sort> sorts;
buffer<symbol> names;
sorts.append(old_q->get_num_decls(), old_q->get_decl_sorts());
names.append(old_q->get_num_decls(), old_q->get_decl_names());
sorts.append(nested_q->get_num_decls(), nested_q->get_decl_sorts());
names.append(nested_q->get_num_decls(), nested_q->get_decl_names());
q1 = m().mk_quantifier(old_q->is_forall(),
sorts.size(),
sorts.c_ptr(),
names.c_ptr(),
nested_q->get_expr(),
std::min(old_q->get_weight(), nested_q->get_weight()),
old_q->get_qid(),
old_q->get_skid(),
0, 0, 0, 0);
SASSERT(is_well_sorted(m(), q1));
if (m().proofs_enabled()) {
SASSERT(old_q->get_expr() == new_body);
p1 = m().mk_pull_quant(old_q, q1);
}
}
else {
ptr_buffer<expr> new_patterns_buf;
ptr_buffer<expr> new_no_patterns_buf;
new_patterns_buf.append(old_q->get_num_patterns(), new_patterns);
new_no_patterns_buf.append(old_q->get_num_no_patterns(), new_no_patterns);
remove_duplicates(new_patterns_buf);
remove_duplicates(new_no_patterns_buf);
q1 = m().update_quantifier(old_q,
new_patterns_buf.size(), new_patterns_buf.c_ptr(), new_no_patterns_buf.size(), new_no_patterns_buf.c_ptr(),
new_body);
TRACE("reduce_quantifier", tout << mk_ismt2_pp(old_q, m()) << "\n----->\n" << mk_ismt2_pp(q1, m()) << "\n";);
SASSERT(is_well_sorted(m(), q1));
}
elim_unused_vars(m(), q1, result);
TRACE("reduce_quantifier", tout << "after elim_unused_vars:\n" << mk_ismt2_pp(result, m()) << "\n";);
result_pr = 0;
if (m().proofs_enabled()) {
proof * p2 = 0;
if (q1.get() != result.get())
p2 = m().mk_elim_unused_vars(q1, result);
result_pr = m().mk_transitivity(p1, p2);
}
return true;
}
th_rewriter_cfg(ast_manager & m, params_ref const & p):
m_b_rw(m, p),
m_a_rw(m, p),
m_bv_rw(m, p),
m_ar_rw(m, p),
m_dt_rw(m),
m_f_rw(m, p),
m_dl_rw(m),
m_a_util(m),
m_bv_util(m),
m_used_dependencies(m),
m_subst(0) {
updt_local_params(p);
}
void set_substitution(expr_substitution * s) {
reset();
m_subst = s;
}
void reset() {
m_subst = 0;
}
bool get_subst(expr * s, expr * & t, proof * & pr) {
if (m_subst == 0)
return false;
expr_dependency * d = 0;
if (m_subst->find(s, t, pr, d)) {
m_used_dependencies = m().mk_join(m_used_dependencies, d);
return true;
}
return false;
}
void set_cancel(bool f) {
m_a_rw.set_cancel(f);
}
};
template class rewriter_tpl<th_rewriter_cfg>;
struct th_rewriter::imp : public rewriter_tpl<th_rewriter_cfg> {
th_rewriter_cfg m_cfg;
imp(ast_manager & m, params_ref const & p):
rewriter_tpl<th_rewriter_cfg>(m, m.proofs_enabled(), m_cfg),
m_cfg(m, p) {
}
};
th_rewriter::th_rewriter(ast_manager & m, params_ref const & p):
m_params(p) {
m_imp = alloc(imp, m, p);
}
ast_manager & th_rewriter::m() const {
return m_imp->m();
}
void th_rewriter::updt_params(params_ref const & p) {
m_params = p;
m_imp->cfg().updt_params(p);
}
void th_rewriter::get_param_descrs(param_descrs & r) {
bool_rewriter::get_param_descrs(r);
arith_rewriter::get_param_descrs(r);
bv_rewriter::get_param_descrs(r);
array_rewriter::get_param_descrs(r);
insert_max_memory(r);
insert_max_steps(r);
r.insert(":push-ite-arith", CPK_BOOL, "(default: false) push if-then-else over arithmetic terms.");
r.insert(":push-ite-bv", CPK_BOOL, "(default: false) push if-then-else over bit-vector terms.");
r.insert(":pull-cheap-ite", CPK_BOOL, "(default: false) pull if-then-else terms when cheap.");
r.insert(":cache-all", CPK_BOOL, "(default: false) cache all intermediate results.");
}
th_rewriter::~th_rewriter() {
dealloc(m_imp);
}
unsigned th_rewriter::get_cache_size() const {
return m_imp->get_cache_size();
}
unsigned th_rewriter::get_num_steps() const {
return m_imp->get_num_steps();
}
void th_rewriter::set_cancel(bool f) {
#pragma omp critical (th_rewriter)
{
m_imp->set_cancel(f);
m_imp->cfg().set_cancel(f);
}
}
void th_rewriter::cleanup() {
ast_manager & m = m_imp->m();
#pragma omp critical (th_rewriter)
{
dealloc(m_imp);
m_imp = alloc(imp, m, m_params);
}
}
void th_rewriter::reset() {
m_imp->reset();
m_imp->cfg().reset();
}
void th_rewriter::operator()(expr_ref & term) {
expr_ref result(term.get_manager());
m_imp->operator()(term, result);
term = result;
}
void th_rewriter::operator()(expr * t, expr_ref & result) {
m_imp->operator()(t, result);
}
void th_rewriter::operator()(expr * t, expr_ref & result, proof_ref & result_pr) {
m_imp->operator()(t, result, result_pr);
}
void th_rewriter::operator()(expr * n, unsigned num_bindings, expr * const * bindings, expr_ref & result) {
m_imp->operator()(n, num_bindings, bindings, result);
}
void th_rewriter::set_substitution(expr_substitution * s) {
m_imp->reset(); // reset the cache
m_imp->cfg().set_substitution(s);
}
expr_dependency * th_rewriter::get_used_dependencies() {
return m_imp->cfg().m_used_dependencies;
}
void th_rewriter::reset_used_dependencies() {
if (get_used_dependencies() != 0) {
set_substitution(m_imp->cfg().m_subst); // reset cache preserving subst
m_imp->cfg().m_used_dependencies = 0;
}
}
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