/** Move all preCondition block instructions before conditionBlock instructions */
public void mergePreCondition() {
if (preCondition != null && conditionBlock != null) {
preCondition.getInstructions().addAll(conditionBlock.getInstructions());
conditionBlock.getInstructions().clear();
conditionBlock.getInstructions().addAll(preCondition.getInstructions());
preCondition.getInstructions().clear();
}
}
/** Check if pre-conditions can be inlined into loop condition */
public boolean checkPreCondition() {
List<InsnNode> insns = preCondition.getInstructions();
if (insns.isEmpty()) return true;
IfNode ifInsn = getIfInsn();
int size = insns.size();
for (int i = 0; i < size; i++) {
InsnNode insn = insns.get(i);
if (insn.getResult() == null) {
return false;
} else {
RegisterArg res = insn.getResult();
if (res.getTypedVar().getUseList().size() > 2) return false;
boolean found = false;
// search result arg in other insns
for (int j = i + 1; j < size; j++) {
if (insns.get(i).containsArg(res)) found = true;
}
// or in if insn
if (!found && ifInsn.containsArg(res)) found = true;
if (!found) return false;
}
}
return true;
}
public IfNode getIfInsn() {
return (IfNode)
conditionBlock.getInstructions().get(conditionBlock.getInstructions().size() - 1);
}