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add vocabulary for arbitrary PB inequalities

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-11-09 16:13:26 -08:00
parent 293a97bdfc
commit 3e8c7d85aa
2 changed files with 62 additions and 11 deletions
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59
src/ast/card_decl_plugin.cpp
View file

@ -20,7 +20,8 @@ Revision History:
#include "card_decl_plugin.h"
card_decl_plugin::card_decl_plugin():
m_at_most_sym("at-most")
m_at_most_sym("at-most"),
m_pble_sym("pble")
{}
func_decl * card_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters, parameter const * parameters,
@ -32,16 +33,36 @@ func_decl * card_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters,
m.raise_exception("invalid non-Boolean sort applied to 'at-most'");
}
}
if (num_parameters != 1 || !parameters[0].is_int() || parameters[0].get_int() < 0) {
m.raise_exception("function 'at-most' expects one non-negative integer parameter");
switch(k) {
case OP_AT_MOST_K: {
if (num_parameters != 1 || !parameters[0].is_int() || parameters[0].get_int() < 0) {
m.raise_exception("function 'at-most' expects one non-negative integer parameter");
}
func_decl_info info(m_family_id, OP_AT_MOST_K, 1, parameters);
return m.mk_func_decl(m_at_most_sym, arity, domain, m.mk_bool_sort(), info);
}
case OP_PB_LE: {
if (num_parameters != 1 + arity || !parameters[0].is_int()) {
m.raise_exception("function 'pble' expects arity+1 integer parameters");
}
for (unsigned i = 1; i < num_parameters; ++i) {
if (!parameters[i].is_int()) {
m.raise_exception("function 'pble' expects arity+1 integer parameters");
}
}
func_decl_info info(m_family_id, OP_PB_LE, num_parameters, parameters);
return m.mk_func_decl(m_pble_sym, arity, domain, m.mk_bool_sort(), info);
}
default:
UNREACHABLE();
return 0;
}
func_decl_info info(m_family_id, OP_AT_MOST_K, 1, parameters);
return m.mk_func_decl(m_at_most_sym, arity, domain, m.mk_bool_sort(), info);
}
void card_decl_plugin::get_op_names(svector<builtin_name> & op_names, symbol const & logic) {
if (logic == symbol::null) {
op_names.push_back(builtin_name(m_at_most_sym.bare_str(), OP_AT_MOST_K));
op_names.push_back(builtin_name(m_pble_sym.bare_str(), OP_PB_LE));
}
}
@ -65,8 +86,30 @@ bool card_util::is_at_most_k(app *a, unsigned& k) const {
}
}
unsigned card_util::get_k(app *a) const {
SASSERT(is_at_most_k(a));
return static_cast<unsigned>(a->get_decl()->get_parameter(0).get_int());
int card_util::get_k(app *a) const {
SASSERT(is_at_most_k(a) || is_le(a));
return a->get_decl()->get_parameter(0).get_int();
}
bool card_util::is_le(app *a) const {
return is_app_of(a, m_fid, OP_PB_LE);
}
bool card_util::is_le(app* a, int& k) const {
if (is_le(a)) {
k = get_k(a);
return true;
}
else {
return false;
}
}
int card_util::get_le_coeff(app* a, unsigned index) {
SASSERT(is_le(a));
SASSERT(1 + index < a->get_decl()->get_num_parameters());
return a->get_decl()->get_parameter(index + 1).get_int();
}

14
src/ast/card_decl_plugin.h
View file

@ -30,14 +30,17 @@ hence:
#include"ast.h"
enum card_op_kind {
OP_AT_MOST_K,
OP_AT_MOST_K, // at most K Booleans are true.
OP_PB_LE, // pseudo-Boolean <= (generalizes at_most_k)
LAST_CARD_OP
};
class card_decl_plugin : public decl_plugin {
symbol m_at_most_sym;
symbol m_pble_sym;
func_decl * mk_at_most(unsigned arity, unsigned k);
func_decl * mk_le(unsigned arity, int const* coeffs, int k);
public:
card_decl_plugin();
virtual ~card_decl_plugin() {}
@ -54,7 +57,8 @@ public:
//
// Contract for func_decl:
// parameters[0] - integer (at most k elements)
// all sorts are Booleans
// all sorts are Booleans
// parameters[1] .. parameters[arity] - coefficients
virtual func_decl * mk_func_decl(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range);
virtual void get_op_names(svector<builtin_name> & op_names, symbol const & logic);
@ -68,9 +72,13 @@ public:
card_util(ast_manager& m):m(m), m_fid(m.mk_family_id("card")) {}
ast_manager & get_manager() const { return m; }
app * mk_at_most_k(unsigned num_args, expr * const * args, unsigned k);
app * mk_le(unsigned num_args, int * const* coeffs, expr * const * args, int k);
bool is_at_most_k(app *a) const;
bool is_at_most_k(app *a, unsigned& k) const;
unsigned get_k(app *a) const;
int get_k(app *a) const;
bool is_le(app *a) const;
bool is_le(app* a, int& k) const;
int get_le_coeff(app* a, unsigned index);
};