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Make ConstantPropagatorAndFolder more extensible #2134

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Dec 18, 2024
Merged

Make ConstantPropagatorAndFolder more extensible #2134

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81 changes: 47 additions & 34 deletions src/main/java/soot/jimple/toolkits/scalar/ConstantPropagatorAndFolder.java
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Original file line number Diff line number Diff line change
Expand Up @@ -67,8 +67,9 @@ public static ConstantPropagatorAndFolder v() {
protected void internalTransform(Body b, String phaseName, Map<String, String> options) {
int numFolded = 0;
int numPropagated = 0;
final boolean verbose = Options.v().verbose();

if (Options.v().verbose()) {
if (verbose) {
logger.debug("[" + b.getMethod().getName() + "] Propagating and folding constants...");
}

Expand All @@ -79,47 +80,59 @@ protected void internalTransform(Body b, String phaseName, Map<String, String> o
// go through each use box in each statement
for (Unit u : (new PseudoTopologicalOrderer<Unit>()).newList(g, false)) {
// propagation pass
for (ValueBox useBox : u.getUseBoxes()) {
Value value = useBox.getValue();
if (value instanceof Local) {
Local local = (Local) value;
List<Unit> defsOfUse = localDefs.getDefsOfAt(local, u);
if (defsOfUse.size() == 1) {
DefinitionStmt defStmt = (DefinitionStmt) defsOfUse.get(0);
Value rhs = defStmt.getRightOp();
if (rhs instanceof NumericConstant || rhs instanceof StringConstant || rhs instanceof NullConstant) {
if (useBox.canContainValue(rhs)) {
useBox.setValue(rhs);
numPropagated++;
}
} else if (rhs instanceof CastExpr) {
CastExpr ce = (CastExpr) rhs;
if (ce.getCastType() instanceof RefType && ce.getOp() instanceof NullConstant) {
defStmt.getRightOpBox().setValue(NullConstant.v());
numPropagated++;
}
}
numPropagated += propagate(localDefs, u);

// folding pass
numFolded += fold(u);
}

if (verbose) {
logger.debug("[" + b.getMethod().getName() + "] Propagated: " + numPropagated + ", Folded: " + numFolded);
}
}

protected int fold(Unit u) {
int numFolded = 0;
for (ValueBox useBox : u.getUseBoxes()) {
Value value = useBox.getValue();
if (!(value instanceof Constant)) {
if (Evaluator.isValueConstantValued(value)) {
Value constValue = Evaluator.getConstantValueOf(value);
if (useBox.canContainValue(constValue)) {
useBox.setValue(constValue);
numFolded++;
}
}
}
}
return numFolded;
}

// folding pass
for (ValueBox useBox : u.getUseBoxes()) {
Value value = useBox.getValue();
if (!(value instanceof Constant)) {
if (Evaluator.isValueConstantValued(value)) {
Value constValue = Evaluator.getConstantValueOf(value);
if (useBox.canContainValue(constValue)) {
useBox.setValue(constValue);
numFolded++;
protected int propagate(LocalDefs localDefs, Unit u) {
int numPropagated = 0;
for (ValueBox useBox : u.getUseBoxes()) {
Value value = useBox.getValue();
if (value instanceof Local) {
Local local = (Local) value;
List<Unit> defsOfUse = localDefs.getDefsOfAt(local, u);
if (defsOfUse.size() == 1) {
DefinitionStmt defStmt = (DefinitionStmt) defsOfUse.get(0);
Value rhs = defStmt.getRightOp();
if (rhs instanceof NumericConstant || rhs instanceof StringConstant || rhs instanceof NullConstant) {
if (useBox.canContainValue(rhs)) {
useBox.setValue(rhs);
numPropagated++;
}
} else if (rhs instanceof CastExpr) {
CastExpr ce = (CastExpr) rhs;
if (ce.getCastType() instanceof RefType && ce.getOp() instanceof NullConstant) {
defStmt.getRightOpBox().setValue(NullConstant.v());
numPropagated++;
}
}
}
}
}

if (Options.v().verbose()) {
logger.debug("[" + b.getMethod().getName() + "] Propagated: " + numPropagated + ", Folded: " + numFolded);
}
return numPropagated;
}
}
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