/** Returns the target for the given SpecialInvokeExpr. */
public SootMethod resolveSpecialDispatch(SpecialInvokeExpr ie, SootMethod container) {
container.getDeclaringClass().checkLevel(SootClass.HIERARCHY);
SootMethod target = ie.getMethod();
target.getDeclaringClass().checkLevel(SootClass.HIERARCHY);
/* This is a bizarre condition! Hopefully the implementation is correct.
See VM Spec, 2nd Edition, Chapter 6, in the definition of invokespecial. */
if (target.getName().equals("<init>") || target.isPrivate()) return target;
else if (isClassSubclassOf(target.getDeclaringClass(), container.getDeclaringClass()))
return resolveConcreteDispatch(container.getDeclaringClass(), target);
else return target;
}
/**
* This method pushes all newExpr down to be the stmt directly before every invoke of the init
* only if they are in the types list
*/
public void internalTransform(Body b, String phaseName, Map options) {
JimpleBody body = (JimpleBody) b;
if (Options.v().verbose())
G.v().out.println("[" + body.getMethod().getName() + "] Folding Jimple constructors...");
Chain units = body.getUnits();
List<Unit> stmtList = new ArrayList<Unit>();
stmtList.addAll(units);
Iterator<Unit> it = stmtList.iterator();
Iterator<Unit> nextStmtIt = stmtList.iterator();
// start ahead one
nextStmtIt.next();
SmartLocalDefs localDefs = SmartLocalDefsPool.v().getSmartLocalDefsFor(body);
UnitGraph graph = localDefs.getGraph();
LocalUses localUses = new SimpleLocalUses(graph, localDefs);
/* fold in NewExpr's with specialinvoke's */
while (it.hasNext()) {
Stmt s = (Stmt) it.next();
if (!(s instanceof AssignStmt)) continue;
/* this should be generalized to ArrayRefs */
// only deal with stmts that are an local = newExpr
Value lhs = ((AssignStmt) s).getLeftOp();
if (!(lhs instanceof Local)) continue;
Value rhs = ((AssignStmt) s).getRightOp();
if (!(rhs instanceof NewExpr)) continue;
// check if very next statement is invoke -->
// this indicates there is no control flow between
// new and invoke and should do nothing
if (nextStmtIt.hasNext()) {
Stmt next = (Stmt) nextStmtIt.next();
if (next instanceof InvokeStmt) {
InvokeStmt invoke = (InvokeStmt) next;
if (invoke.getInvokeExpr() instanceof SpecialInvokeExpr) {
SpecialInvokeExpr invokeExpr = (SpecialInvokeExpr) invoke.getInvokeExpr();
if (invokeExpr.getBase() == lhs) {
break;
}
}
}
}
// check if new is in the types list - only process these
if (!types.contains(((NewExpr) rhs).getType())) continue;
List lu = localUses.getUsesOf(s);
Iterator luIter = lu.iterator();
boolean MadeNewInvokeExpr = false;
while (luIter.hasNext()) {
Unit use = ((UnitValueBoxPair) (luIter.next())).unit;
if (!(use instanceof InvokeStmt)) continue;
InvokeStmt is = (InvokeStmt) use;
if (!(is.getInvokeExpr() instanceof SpecialInvokeExpr)
|| lhs != ((SpecialInvokeExpr) is.getInvokeExpr()).getBase()) continue;
// make a new one here
AssignStmt constructStmt =
Jimple.v()
.newAssignStmt(((DefinitionStmt) s).getLeftOp(), ((DefinitionStmt) s).getRightOp());
constructStmt.setRightOp(Jimple.v().newNewExpr(((NewExpr) rhs).getBaseType()));
MadeNewInvokeExpr = true;
// redirect jumps
use.redirectJumpsToThisTo(constructStmt);
// insert new one here
units.insertBefore(constructStmt, use);
constructStmt.addTag(s.getTag("SourceLnPosTag"));
}
if (MadeNewInvokeExpr) {
units.remove(s);
}
}
}
