private function shuffle_stmts(PhpParser\Node &$node)
{
global $conf;
if ($conf->shuffle_stmts) {
if (isset($node->stmts)) {
$stmts = $node->stmts;
$chunk_size = shuffle_get_chunk_size($stmts);
if ($chunk_size <= 0) {
return false;
}
// should never occur!
if (count($stmts) > 2 * $chunk_size) {
// $last_inst = array_pop($stmts);
$stmts = shuffle_statements($stmts);
// $stmts[] = $last_inst;
$node->stmts = $stmts;
return true;
}
}
}
return false;
}
function shuffle_statements($stmts)
{
global $conf;
global $t_scrambler;
if (!$conf->shuffle_stmts) {
return $stmts;
}
$chunk_size = shuffle_get_chunk_size($stmts);
if ($chunk_size <= 0) {
return $stmts;
}
// should never occur!
$n = count($stmts);
if ($n < 2 * $chunk_size) {
return $stmts;
}
$scrambler = $t_scrambler['label'];
$label_name_prev = $scrambler->scramble($scrambler->generate_label_name());
$first_goto = new PhpParser\Node\Stmt\Goto_($label_name_prev);
$t = array();
$t_chunk = array();
for ($i = 0; $i < $n; ++$i) {
$t_chunk[] = $stmts[$i];
if (count($t_chunk) >= $chunk_size) {
$label = array(new PhpParser\Node\Stmt\Label($label_name_prev));
$label_name = $scrambler->scramble($scrambler->generate_label_name());
$goto = array(new PhpParser\Node\Stmt\Goto_($label_name));
$t[] = array_merge($label, $t_chunk, $goto);
$label_name_prev = $label_name;
$t_chunk = array();
}
}
if (count($t_chunk) > 0) {
$label = array(new PhpParser\Node\Stmt\Label($label_name_prev));
$label_name = $scrambler->scramble($scrambler->generate_label_name());
$goto = array(new PhpParser\Node\Stmt\Goto_($label_name));
$t[] = array_merge($label, $t_chunk, $goto);
$label_name_prev = $label_name;
$t_chunk = array();
}
$last_label = new PhpParser\Node\Stmt\Label($label_name);
shuffle($t);
$stmts = array();
$stmts[] = $first_goto;
foreach ($t as $dummy => $stmt) {
foreach ($stmt as $dummy => $inst) {
$stmts[] = $inst;
}
}
$stmts[] = $last_label;
return $stmts;
}