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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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Leonardo de Moura 2012-10-02 11:35:25 -07:00
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lib/smt_quantifier_stat.cpp Normal file
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
smt_quantifier_stat.cpp
Abstract:
<abstract>
Author:
Leonardo de Moura (leonardo) 2008-02-20.
Revision History:
--*/
#include"smt_quantifier_stat.h"
namespace smt {
quantifier_stat::quantifier_stat(unsigned generation):
m_size(0),
m_depth(0),
m_generation(generation),
m_case_split_factor(1),
m_num_nested_quantifiers(0),
m_num_instances(0),
m_num_instances_curr_search(0),
m_num_instances_curr_branch(0),
m_max_generation(0),
m_max_cost(0.0f) {
}
quantifier_stat_gen::quantifier_stat_gen(ast_manager & m, region & r):
m_manager(m),
m_region(r) {
}
void quantifier_stat_gen::reset() {
m_already_found.reset();
m_todo.reset();
m_case_split_factor = 1;
}
quantifier_stat * quantifier_stat_gen::operator()(quantifier * q, unsigned generation) {
reset();
quantifier_stat * r = new (m_region) quantifier_stat(generation);
m_todo.push_back(entry(q->get_expr()));
while (!m_todo.empty()) {
entry & e = m_todo.back();
expr * n = e.m_expr;
unsigned depth = e.m_depth;
bool depth_only = e.m_depth_only;
m_todo.pop_back();
unsigned old_depth;
if (m_already_found.find(n, old_depth)) {
if (old_depth >= depth)
continue;
depth_only = true;
}
m_already_found.insert(n, depth);
if (depth >= r->m_depth)
r->m_depth = depth;
if (!depth_only) {
r->m_size++;
if (is_quantifier(n))
r->m_num_nested_quantifiers ++;
if (is_app(n) && to_app(n)->get_family_id() == m_manager.get_basic_family_id()) {
unsigned num_args = to_app(n)->get_num_args();
// Remark: I'm approximating the case_split factor.
// I'm also ignoring the case split factor due to theories.
switch (to_app(n)->get_decl_kind()) {
case OP_OR:
if (depth == 0)
m_case_split_factor *= num_args;
else
m_case_split_factor *= (num_args + 1);
break;
case OP_AND:
if (depth > 0)
m_case_split_factor *= (num_args + 1);
break;
case OP_IFF:
if (depth == 0)
m_case_split_factor *= 4;
else
m_case_split_factor *= 9;
break;
case OP_ITE:
if (depth == 0)
m_case_split_factor *= 4;
else
m_case_split_factor *= 9;
break;
default:
break;
}
}
}
if (is_app(n)) {
unsigned j = to_app(n)->get_num_args();
while (j > 0) {
--j;
m_todo.push_back(entry(to_app(n)->get_arg(j), depth + 1, depth_only));
}
}
}
r->m_case_split_factor = m_case_split_factor.get_value();
return r;
}
};