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adding translation routine to context to address enhancement request #209

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2015-10-31 14:28:21 -07:00
parent 4b1a730f46
commit 9acaa49a05
2 changed files with 105 additions and 15 deletions
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116
src/smt/smt_context.cpp
View file

@ -36,6 +36,7 @@ Revision History:
#include"smt_model_finder.h"
#include"model_pp.h"
#include"ast_smt2_pp.h"
#include"ast_translation.h"
namespace smt {
@ -102,34 +103,119 @@ namespace smt {
flush();
}
context * context::mk_fresh(symbol const * l, smt_params * p) {
context * new_ctx = alloc(context, m_manager, p == 0 ? m_fparams : *p);
new_ctx->set_logic(l == 0 ? m_setup.get_logic() : *l);
void context::copy_plugins(context& src, context& dst) {
// copy missing simplifier_plugins
// remark: some simplifier_plugins are automatically created by the asserted_formulas class.
simplifier & s = get_simplifier();
simplifier & new_s = new_ctx->get_simplifier();
ptr_vector<simplifier_plugin>::const_iterator it1 = s.begin_plugins();
ptr_vector<simplifier_plugin>::const_iterator end1 = s.end_plugins();
simplifier & src_s = src.get_simplifier();
simplifier & dst_s = dst.get_simplifier();
ptr_vector<simplifier_plugin>::const_iterator it1 = src_s.begin_plugins();
ptr_vector<simplifier_plugin>::const_iterator end1 = src_s.end_plugins();
for (; it1 != end1; ++it1) {
simplifier_plugin * p = *it1;
if (new_s.get_plugin(p->get_family_id()) == 0) {
new_ctx->register_plugin(p->mk_fresh());
if (dst_s.get_plugin(p->get_family_id()) == 0) {
dst.register_plugin(p->mk_fresh());
}
SASSERT(new_s.get_plugin(p->get_family_id()) != 0);
SASSERT(dst_s.get_plugin(p->get_family_id()) != 0);
}
// copy theory plugins
ptr_vector<theory>::iterator it2 = m_theory_set.begin();
ptr_vector<theory>::iterator end2 = m_theory_set.end();
ptr_vector<theory>::iterator it2 = src.m_theory_set.begin();
ptr_vector<theory>::iterator end2 = src.m_theory_set.end();
for (; it2 != end2; ++it2) {
theory * new_th = (*it2)->mk_fresh(new_ctx);
new_ctx->register_plugin(new_th);
theory * new_th = (*it2)->mk_fresh(&dst);
dst.register_plugin(new_th);
}
new_ctx->m_setup.mark_already_configured();
dst.m_setup.mark_already_configured();
}
context * context::mk_fresh(symbol const * l, smt_params * p) {
context * new_ctx = alloc(context, m_manager, p == 0 ? m_fparams : *p);
new_ctx->set_logic(l == 0 ? m_setup.get_logic() : *l);
copy_plugins(*this, *new_ctx);
return new_ctx;
}
context* context::translate(ast_manager& m) {
pop_to_base_lvl();
if (m_base_lvl > 0) {
throw default_exception("Cloning contexts within a user-scope is not allowed");
}
reduce_assertions();
context * new_ctx = alloc(context, m, m_fparams);
ast_manager& dst_m = new_ctx->get_manager();
new_ctx->set_logic(m_setup.get_logic());
copy_plugins(*this, *new_ctx);
asserted_formulas& src_af = m_asserted_formulas;
asserted_formulas& dst_af = new_ctx->m_asserted_formulas;
SASSERT(m_base_lvl == 0); // please don't clone me
SASSERT(src_af.get_qhead() == src_af.get_num_formulas()); // should be the same.
// Copy asserted formulas.
for (unsigned i = 0; i < src_af.get_num_formulas(); ++i) {
expr_ref fml(dst_m), pr(dst_m);
fml = ::translate(src_af.get_formula(i), get_manager(), dst_m);
pr = ::translate(src_af.get_formula_proof(i), get_manager(), dst_m);
dst_af.assert_expr(fml, to_app(pr));
}
dst_af.reduce();
for (unsigned i = 0; i < dst_af.get_num_formulas(); ++i) {
expr* f = dst_af.get_formula(i);
proof* pr = dst_af.get_formula_proof(i);
new_ctx->internalize_assertion(f, pr, 0);
}
// Copy learned lemmas, but internalize them as axioms.
// ignore jusification.
for (unsigned i = 0; i < m_lemmas.size(); ++i) {
expr_ref_vector new_clause(dst_m);
clause& src_cls = *m_lemmas[i];
unsigned sz = src_cls.get_num_literals();
bool internalized = true;
for (unsigned j = 0; internalized && j < sz; ++j) {
literal src_lit = src_cls.get_literal(j);
expr_ref r = translate(src_lit, *new_ctx);
internalized = r != 0;
new_clause.push_back(r);
}
if (internalized) {
app_ref cls(dst_m);
cls = dst_m.mk_or(new_clause.size(), new_clause.c_ptr());
new_ctx->internalize_assertion(cls, 0, 0);
}
else {
TRACE("smt_context", display_clause_detail(tout << "Clause not interalized\n", &src_cls););
}
}
return new_ctx;
}
expr_ref context::translate(literal lit, context& dst) {
ast_manager& m = dst.get_manager();
expr_ref result(m);
expr * e;
if (lit == true_literal) {
result = m.mk_true();
}
else if (lit == false_literal) {
result = m.mk_false();
}
else if (e = m_bool_var2expr.get(lit.var(), 0)) {
result = ::translate(e, m_manager, m);
if (lit.sign()) {
result = dst.get_manager().mk_not(result);
}
}
return result;
}
void context::init() {
app * t = m_manager.mk_true();
mk_bool_var(t);

4
src/smt/smt_context.h
View file

@ -1324,6 +1324,10 @@ namespace smt {
// -----------------------------------
void assert_expr_core(expr * e, proof * pr);
// copy plugins into a fresh context.
void copy_plugins(context& src, context& dst);
expr_ref translate(literal lit, context& dst);
public:
context(ast_manager & m, smt_params & fp, params_ref const & p = params_ref());