public static function replaceVar(Operand $from, Operand $to)
{
foreach ($from->usages as $usage) {
foreach ($usage->getVariableNames() as $varName) {
$vars = $usage->{$varName};
$newVars = [];
if (!is_array($vars)) {
$vars = [$vars];
}
foreach ($vars as $key => $value) {
if ($value === $from) {
$newVars[$key] = $to;
$to->addUsage($usage);
} else {
$newVars[$key] = $value;
}
}
if (!is_array($usage->{$varName})) {
$usage->{$varName} = array_shift($newVars);
} else {
$usage->{$varName} = $newVars;
}
}
}
}
public function removeOperand(Operand $op)
{
foreach ($this->vars as $key => $value) {
if ($op === $value) {
$op->removeUsage($this);
unset($this->vars[$key]);
$this->vars = array_values($this->vars);
}
}
}
private function replaceOpVariable(Operand $from, Operand $to, Op $op)
{
foreach ($op->getVariableNames() as $name) {
if (is_null($op->{$name})) {
continue;
}
if (is_array($op->{$name})) {
// SIGH, PHP won't let me do this directly (parses as $op->($name[$key]))
$result = $op->{$name};
$new = [];
foreach ($result as $key => $value) {
if ($value === $from) {
$new[$key] = $to;
if ($op->isWriteVariable($name)) {
$to->addWriteOp($op);
} else {
$to->addUsage($op);
}
} else {
$new[$key] = $value;
}
}
$op->{$name} = $new;
} elseif ($op->{$name} === $from) {
$op->{$name} = $to;
if ($op->isWriteVariable($name)) {
$to->addWriteOp($op);
} else {
$to->addUsage($op);
}
}
}
}
