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z3/lib/smt_cg_table.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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7.2 KiB
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
smt_cg_table.cpp
Abstract:
<abstract>
Author:
Leonardo de Moura (leonardo) 2008-02-19.
Revision History:
--*/
#include"smt_cg_table.h"
#include"ast_pp.h"
#include"ast_ll_pp.h"
namespace smt {
#if 0
unsigned cg_table::cg_hash::operator()(enode * n) const {
if (n->is_commutative()) {
return combine_hash(n->get_decl_id(),
n->get_arg(0)->get_root()->hash() *
n->get_arg(1)->get_root()->hash());
}
else {
unsigned num = n->get_num_args();
switch (num) {
case 0: UNREACHABLE(); return 0;
case 1:
return combine_hash(n->get_decl_id(), n->get_arg(0)->get_root()->hash());
case 2: {
unsigned a = n->get_decl_id();
unsigned b = n->get_arg(0)->get_root()->hash();
unsigned c = n->get_arg(1)->get_root()->hash();
mix(a,b,c);
return c;
}
default:
return get_composite_hash<enode *, cg_khasher, cg_chasher>(n, n->get_num_args(), m_khasher, m_chasher);
}
}
}
bool cg_table::cg_eq::operator()(enode * n1, enode * n2) const {
#if 0
static unsigned counter = 0;
static unsigned failed = 0;
bool r = congruent(n1, n2, m_commutativity);
if (!r)
failed++;
counter++;
if (counter % 100000 == 0)
std::cout << "cg_eq: " << counter << " " << failed << "\n";
return r;
#else
return congruent(n1, n2, m_commutativity);
#endif
}
cg_table::cg_table(ast_manager & m):
m_manager(m),
m_table(DEFAULT_HASHTABLE_INITIAL_CAPACITY, cg_hash(), cg_eq(m_commutativity)) {
}
void cg_table::display(std::ostream & out) const {
out << "congruence table:\n";
table::iterator it = m_table.begin();
table::iterator end = m_table.end();
for (; it != end; ++it) {
enode * n = *it;
out << mk_pp(n->get_owner(), m_manager) << "\n";
}
}
void cg_table::display_compact(std::ostream & out) const {
if (!m_table.empty()) {
out << "congruence table:\n";
table::iterator it = m_table.begin();
table::iterator end = m_table.end();
for (; it != end; ++it) {
enode * n = *it;
out << "#" << n->get_owner()->get_id() << " ";
}
out << "\n";
}
}
#ifdef Z3DEBUG
bool cg_table::check_invariant() const {
table::iterator it = m_table.begin();
table::iterator end = m_table.end();
for (; it != end; ++it) {
enode * n = *it;
CTRACE("cg_table", !contains_ptr(n), tout << "#" << n->get_owner_id() << "\n";);
SASSERT(contains_ptr(n));
}
return true;
}
#endif
#else
// one table per func_decl implementation
unsigned cg_table::cg_hash::operator()(enode * n) const {
SASSERT(n->get_decl()->is_flat_associative() || n->get_num_args() >= 3);
unsigned a, b, c;
a = b = 0x9e3779b9;
c = 11;
unsigned i = n->get_num_args();
while (i >= 3) {
i--;
a += n->get_arg(i)->get_root()->hash();
i--;
b += n->get_arg(i)->get_root()->hash();
i--;
c += n->get_arg(i)->get_root()->hash();
mix(a, b, c);
}
switch (i) {
case 2:
b += n->get_arg(1)->get_root()->hash();
__fallthrough;
case 1:
c += n->get_arg(0)->get_root()->hash();
}
mix(a, b, c);
return c;
}
bool cg_table::cg_eq::operator()(enode * n1, enode * n2) const {
SASSERT(n1->get_num_args() == n2->get_num_args());
SASSERT(n1->get_decl() == n2->get_decl());
unsigned num = n1->get_num_args();
for (unsigned i = 0; i < num; i++)
if (n1->get_arg(i)->get_root() != n2->get_arg(i)->get_root())
return false;
return true;
}
cg_table::cg_table(ast_manager & m):
m_manager(m) {
}
cg_table::~cg_table() {
reset();
}
void * cg_table::mk_table_for(func_decl * d) {
void * r;
SASSERT(d->get_arity() >= 1);
switch (d->get_arity()) {
case 1:
r = TAG(void*, alloc(unary_table), UNARY);
SASSERT(GET_TAG(r) == UNARY);
return r;
case 2:
if (d->is_flat_associative()) {
// applications of declarations that are flat-assoc (e.g., +) may have many arguments.
r = TAG(void*, alloc(table), NARY);
SASSERT(GET_TAG(r) == NARY);
return r;
}
else if (d->is_commutative()) {
r = TAG(void*, alloc(comm_table, cg_comm_hash(), cg_comm_eq(m_commutativity)), BINARY_COMM);
SASSERT(GET_TAG(r) == BINARY_COMM);
return r;
}
else {
r = TAG(void*, alloc(binary_table), BINARY);
SASSERT(GET_TAG(r) == BINARY);
return r;
}
default:
r = TAG(void*, alloc(table), NARY);
SASSERT(GET_TAG(r) == NARY);
return r;
}
}
unsigned cg_table::set_func_decl_id(enode * n) {
func_decl * f = n->get_decl();
unsigned tid;
if (!m_func_decl2id.find(f, tid)) {
tid = m_tables.size();
m_func_decl2id.insert(f, tid);
m_manager.inc_ref(f);
SASSERT(tid <= m_tables.size());
m_tables.push_back(mk_table_for(f));
}
SASSERT(tid < m_tables.size());
n->set_func_decl_id(tid);
DEBUG_CODE({
unsigned tid_prime;
SASSERT(m_func_decl2id.find(n->get_decl(), tid_prime) && tid == tid_prime);
});
return tid;
}
void cg_table::reset() {
ptr_vector<void>::iterator it = m_tables.begin();
ptr_vector<void>::iterator end = m_tables.end();
for (; it != end; ++it) {
void * t = *it;
switch (GET_TAG(t)) {
case UNARY:
dealloc(UNTAG(unary_table*, t));
break;
case BINARY:
dealloc(UNTAG(binary_table*, t));
break;
case BINARY_COMM:
dealloc(UNTAG(comm_table*, t));
break;
case NARY:
dealloc(UNTAG(table*, t));
break;
}
}
m_tables.reset();
obj_map<func_decl, unsigned>::iterator it2 = m_func_decl2id.begin();
obj_map<func_decl, unsigned>::iterator end2 = m_func_decl2id.end();
for (; it2 != end2; ++it2)
m_manager.dec_ref(it2->m_key);
m_func_decl2id.reset();
}
void cg_table::display(std::ostream & out) const {
}
void cg_table::display_compact(std::ostream & out) const {
}
#ifdef Z3DEBUG
bool cg_table::check_invariant() const {
return true;
}
#endif
#endif
};
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