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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/normalize_vars.cpp Normal file
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
normalize_vars.cpp
Abstract:
<abstract>
Author:
Leonardo de Moura (leonardo) 2008-02-16.
Revision History:
--*/
#include"normalize_vars.h"
expr * normalize_vars::operator()(expr * n) {
SASSERT(m_todo.empty());
m_todo.push_back(n);
while (!m_todo.empty()) {
n = m_todo.back();
if (m_cache.contains(n)) {
m_todo.pop_back();
continue;
}
if (is_var(n)) {
m_todo.pop_back();
unsigned idx = to_var(n)->get_idx();
var * new_var = m_map.get(idx, 0);
if (new_var == 0) {
new_var = m_manager.mk_var(m_next_var, to_var(n)->get_sort());
m_next_var++;
m_new_vars.push_back(new_var);
m_map.setx(idx, new_var, 0);
}
SASSERT(new_var->get_sort() == to_var(n)->get_sort());
m_cache.insert(n, new_var);
}
else {
SASSERT(is_app(n));
bool visited = true;
unsigned num_args = to_app(n)->get_num_args();
unsigned j = num_args;
while (j > 0) {
--j;
expr * child = to_app(n)->get_arg(j);
if (!m_cache.contains(child)) {
m_todo.push_back(child);
visited = false;
}
}
if (visited) {
m_todo.pop_back();
m_new_children.reset();
bool modified = false;
for (unsigned i = 0; i < num_args; i++) {
expr * child = to_app(n)->get_arg(i);
expr * new_child = 0;
m_cache.find(child, new_child);
SASSERT(new_child);
if (child != new_child)
modified = true;
m_new_children.push_back(new_child);
}
if (!modified)
m_cache.insert(n, n);
else
m_cache.insert(n, m_manager.mk_app(to_app(n)->get_decl(), m_new_children.size(), m_new_children.c_ptr()));
}
}
}
expr * r = 0;
m_cache.find(n, r);
SASSERT(r);
return r;
}
void normalize_vars::reset() {
m_cache.reset();
m_map.reset();
m_new_vars.reset();
m_next_var = 0;
}