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java.lang.Objectsoot.jimple.toolkits.scalar.pre.EarliestnessComputation
public class EarliestnessComputation
Computes the earliest points for the given expressions.
This basicly finds the highest point in the flow-graph where we can put each
computation, without introducing new computations on any path.
More technically: A computation is earliest, if at the current point the
computation is down-safe, and if either:
Note that this computation is linear in the number of units, as we don't need to find any fixed-point.
UpSafetyAnalysis,
DownSafetyAnalysis| Constructor Summary | |
|---|---|
EarliestnessComputation(UnitGraph unitGraph,
UpSafetyAnalysis upSafe,
DownSafetyAnalysis downSafe,
SideEffectTester sideEffect)
given an UpSafetyAnalysis and a DownSafetyAnalysis, performs the earliest-computation. |
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EarliestnessComputation(UnitGraph unitGraph,
UpSafetyAnalysis upSafe,
DownSafetyAnalysis downSafe,
SideEffectTester sideEffect,
FlowSet set)
given an UpSafetyAnalysis and a DownSafetyAnalysis, performs the earliest-computation. allows to share sets over multiple analyses (set-operations are usually more efficient, if the sets come from the same source). |
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| Method Summary | |
|---|---|
Object |
getFlowBefore(Object node)
returns the FlowSet of expressions, that have their earliest computation just before node. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public EarliestnessComputation(UnitGraph unitGraph,
UpSafetyAnalysis upSafe,
DownSafetyAnalysis downSafe,
SideEffectTester sideEffect)
unitGraph - the Unitgraph we'll work on.upSafe - a UpSafetyAnalysis of unitGraphdownSafe - a DownSafetyAnalysis of unitGraphsideEffect - the SideEffectTester that will tell if a node is
transparent or not.
public EarliestnessComputation(UnitGraph unitGraph,
UpSafetyAnalysis upSafe,
DownSafetyAnalysis downSafe,
SideEffectTester sideEffect,
FlowSet set)
unitGraph - the Unitgraph we'll work on.upSafe - a UpSafetyAnalysis of unitGraphdownSafe - a DownSafetyAnalysis of unitGraphsideEffect - the SideEffectTester that will tell if a node is
transparent or not.set - the shared set.| Method Detail |
|---|
public Object getFlowBefore(Object node)
node.
node - a Object of the flow-graph (in our case always a unit).
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