soot.jimple.toolkits.scalar.pre
Class BusyCodeMotion
java.lang.Object
soot.Transformer
soot.BodyTransformer
soot.jimple.toolkits.scalar.pre.BusyCodeMotion
public class BusyCodeMotion
- extends BodyTransformer
Performs a partial redundancy elimination (= code motion). This is
done, by moving everycomputation as high as possible (it is
easy to show, that they are computationally optimal), and then
replacing the original computation by a reference to this new high
computation. This implies, that we introduce many new
helper-variables (that can easily be eliminated afterwards).
In
order to catch every redundant expression, this transformation must
be done on a graph without critical edges. Therefore the first
thing we do, is removing them. A subsequent pass can then easily
remove the synthetic nodes we have introduced.
The term "busy"
refers to the fact, that we always move computations as high
as possible. Even, if this is not necessary.
- See Also:
CriticalEdgeRemover
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
BusyCodeMotion
public BusyCodeMotion(Singletons.Global g)
v
public static BusyCodeMotion v()
internalTransform
protected void internalTransform(Body b,
String phaseName,
Map opts)
- performs the busy code motion.
- Specified by:
internalTransform
in class BodyTransformer
- Parameters:
b
- the body on which to apply the transformationphaseName
- the phasename for this transform; not typically used by implementations.opts
- the actual computed options; a combination of default options and Scene specified options.