soot.jimple.validation.IdentityStatementsValidator Maven / Gradle / Ivy
package soot.jimple.validation;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 1997 - 2018 Raja Vallée-Rai and others
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 2.1 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import java.util.List;
import soot.Body;
import soot.SootMethod;
import soot.Unit;
import soot.jimple.IdentityStmt;
import soot.jimple.ParameterRef;
import soot.jimple.ThisRef;
import soot.util.Chain;
import soot.validation.BodyValidator;
import soot.validation.ValidationException;
public enum IdentityStatementsValidator implements BodyValidator {
INSTANCE;
public static IdentityStatementsValidator v() {
return INSTANCE;
}
/**
* Checks the following invariants on this Jimple body:
*
* - this-references may only occur in instance methods
*
- this-references may only occur as the first statement in a method, if they occur at all
*
- param-references must precede all statements that are not themselves param-references or this-references, if they
* occur at all
*
*/
@Override
public void validate(Body body, List exceptions) {
SootMethod method = body.getMethod();
if (method.isAbstract()) {
return;
}
Chain units = body.getUnits().getNonPatchingChain();
boolean foundNonThisOrParamIdentityStatement = false;
boolean firstStatement = true;
for (Unit unit : units) {
if (unit instanceof IdentityStmt) {
IdentityStmt identityStmt = (IdentityStmt) unit;
if (identityStmt.getRightOp() instanceof ThisRef) {
if (method.isStatic()) {
exceptions.add(new ValidationException(identityStmt, "@this-assignment in a static method!"));
}
if (!firstStatement) {
exceptions.add(new ValidationException(identityStmt,
"@this-assignment statement should precede all other statements" + "\n method: " + method));
}
} else if (identityStmt.getRightOp() instanceof ParameterRef) {
if (foundNonThisOrParamIdentityStatement) {
exceptions.add(new ValidationException(identityStmt,
"@param-assignment statements should precede all non-identity statements" + "\n method: " + method));
}
} else {
// @caughtexception statement
foundNonThisOrParamIdentityStatement = true;
}
} else {
// non-identity statement
foundNonThisOrParamIdentityStatement = true;
}
firstStatement = false;
}
}
@Override
public boolean isBasicValidator() {
return true;
}
}