/**
* Check if it is an exit operation. If it is, return true. <br>
* For conditional exits, checks if the inputs are literals. If yes, tries to resolve the exit. If
* exit can be resolved and is an exit, returns true. Otherwise, returns false and operation is
* ignored. <br>
* For conditional exits which cannot be resolved, false is returned and the conditional exit
* table is updated with the input data (check if from live-in or fu coordinate) and the address.
* <br>
* For all other operations, returns false.
*
* @param operation
* @return
*/
private boolean processExitOperation(Operation operation) {
OperationName opName = operation.getOperation();
// Check if exit
if (opName == OperationName.exit) {
// System.out.println("exit:"+operation);
return true;
}
// Check if NOT conditional exit
if (!IfmUtils.isConditionalExit(opName)) {
// System.out.println("Not conditional:"+operation);
return false;
}
// Is conditional exit
// System.out.println("conditional:"+operation);
// Check if first input is literal
Operand firstOperand = operation.getInput(InputIndex.firstOperand);
boolean isLiteral = firstOperand.getOpType() == Operand.OpType.literal;
if (isLiteral) {
int result = Optimizations.computeLiteral(opName, firstOperand.getValueAsIntegerLiteral(), 0);
// If 1, exit
if (result == 1) {
return true;
} else {
return false;
}
}
// Is not literal
// Check current producers table to check if we can find the register
Operand operand = currentProducers.get(firstOperand.getValue());
Operand jumpAddress = operation.getInput(InputIndex.secondOperand);
// Update table
if (operand != null) {
conditionalExit.put(operand, jumpAddress);
} else {
conditionalExit.put(firstOperand, jumpAddress);
}
// The register was read. Some processing here?
// TODO
return false;
}
/**
* @param operation
* @return true if it is a move operation. False otherwise.
*/
public boolean processMoveOperation(Operation operation) {
// Check if it is a move operation
boolean isMove = operation.getOperation() == OperationName.move;
if (!isMove) {
return false;
}
// Update literals table
String registerName = operation.getOutput(OutputIndex.firstResult).getValue();
Operand literal = operation.getInput(InputIndex.firstOperand);
literalsTable.put(registerName, literal);
// Remove register from current producers, if it is there
currentProducers.remove(registerName);
return true;
}
