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Z3 sources

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2012-10-02 11:35:25 -07:00
parent 3f9edad676
commit e9eab22e5c
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lib/use_list.cpp Normal file
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
use_list.cpp
Abstract:
Use list term index.
Author:
Leonardo de Moura (leonardo) 2008-02-04.
Revision History:
--*/
#include"use_list.h"
void app_use_list::inc_ref(app * n) {
if (n->get_num_args() == 0)
return; // ignore constants
unsigned id = n->get_id();
unsigned c = m_ref_counter.get(id, 0);
m_ref_counter.setx(id, c+1, 0);
if (c == 0)
m_todo.push_back(n);
}
void app_use_list::dec_ref(app * n) {
if (n->get_num_args() == 0)
return; // ignore constants
unsigned id = n->get_id();
SASSERT(m_ref_counter[id] > 0);
m_ref_counter[id]--;
if (m_ref_counter[id] == 0)
m_todo.push_back(n);
}
void app_use_list::insert(expr * n) {
if (is_var(n))
return; // nothing to index
SASSERT(m_todo.empty());
inc_ref(to_app(n));
while (!m_todo.empty()) {
app * n = m_todo.back();
unsigned num_args = n->get_num_args();
for (unsigned i = 0; i < num_args; i++) {
expr * c = n->get_arg(i);
if (is_var(c)) {
if (!m_ignore_vars)
use_list<app*>::insert(n, c);
}
else {
SASSERT(is_app(c));
use_list<app*>::insert(n, c);
inc_ref(to_app(c));
}
}
}
}
void app_use_list::erase(expr * n) {
if (is_var(n))
return; // nothing to index
SASSERT(m_todo.empty());
dec_ref(to_app(n));
while (!m_todo.empty()) {
app * n = m_todo.back();
unsigned num_args = n->get_num_args();
for (unsigned i = 0; i < num_args; i++) {
expr * c = n->get_arg(i);
if (is_var(c)) {
if (!m_ignore_vars)
use_list<app*>::erase(n, c);
}
else {
SASSERT(is_app(c));
use_list<app*>::erase(n, c);
dec_ref(to_app(c));
}
}
}
}
void app_use_list::reset() {
use_list<app*>::reset();
m_ref_counter.reset();
}