public static int getSymbolicIntegerValue(MJIEnv env, int objRef, int v) {
Object[] attrs = env.getArgAttributes();
IntegerExpression sym_arg = (IntegerExpression) attrs[0];
if (sym_arg != null) return env.newString(sym_arg.toString());
else return env.newString(Integer.toString(v));
}
@Override
public Instruction execute(ThreadInfo th) {
StackFrame sf = th.getModifiableTopFrame();
IntegerExpression sym_v1 = (IntegerExpression) sf.getOperandAttr(0);
IntegerExpression sym_v2 = (IntegerExpression) sf.getOperandAttr(1);
if (sym_v1 == null && sym_v2 == null)
return super.execute(th); // we'll still do the concrete execution
else {
int v1 = sf.pop();
int v2 = sf.pop();
sf.push(0, false); // for symbolic expressions, the concrete value does not matter
IntegerExpression result = null;
if (sym_v1 != null) {
if (sym_v2 != null) result = sym_v1._or(sym_v2);
else // v2 is concrete
result = sym_v1._or(v2);
} else if (sym_v2 != null) result = sym_v2._or(v1);
sf.setOperandAttr(result);
// System.out.println("Execute IADD: "+result);
return getNext(th);
}
}
@Override
public Instruction execute(ThreadInfo th) {
StackFrame sf = th.getModifiableTopFrame();
IntegerExpression sym_v1 = (IntegerExpression) sf.getOperandAttr(0);
IntegerExpression sym_v2 = (IntegerExpression) sf.getOperandAttr(1);
int v1, v2;
if (sym_v1 == null && sym_v2 == null)
return super.execute(th); // we'll still do the concrete execution
// result is symbolic
if (sym_v1 == null && sym_v2 != null) {
v1 = sf.pop();
v2 = sf.pop();
if (v1 == 0) return th.createAndThrowException("java.lang.ArithmeticException", "div by 0");
sf.push(0, false);
IntegerExpression result = sym_v2._div(v1);
sf.setOperandAttr(result);
return getNext(th);
}
// div by zero check affects path condition
// sym_v1 is non-null and should be checked against zero
ChoiceGenerator<?> cg;
boolean condition;
if (!th.isFirstStepInsn()) { // first time around
cg = new PCChoiceGenerator(2);
((PCChoiceGenerator) cg).setOffset(this.position);
((PCChoiceGenerator) cg).setMethodName(this.getMethodInfo().getFullName());
th.getVM().setNextChoiceGenerator(cg);
return this;
} else { // this is what really returns results
cg = th.getVM().getChoiceGenerator();
assert (cg instanceof PCChoiceGenerator) : "expected PCChoiceGenerator, got: " + cg;
condition = (Integer) cg.getNextChoice() == 0 ? false : true;
}
v1 = sf.pop();
v2 = sf.pop();
sf.push(0, false);
PathCondition pc;
ChoiceGenerator<?> prev_cg = cg.getPreviousChoiceGeneratorOfType(PCChoiceGenerator.class);
if (prev_cg == null) pc = new PathCondition();
else pc = ((PCChoiceGenerator) prev_cg).getCurrentPC();
assert pc != null;
if (condition) { // check div by zero
pc._addDet(Comparator.EQ, sym_v1, 0);
if (pc.simplify()) { // satisfiable
((PCChoiceGenerator) cg).setCurrentPC(pc);
return th.createAndThrowException("java.lang.ArithmeticException", "div by 0");
} else {
th.getVM().getSystemState().setIgnored(true);
return getNext(th);
}
} else {
pc._addDet(Comparator.NE, sym_v1, 0);
if (pc.simplify()) { // satisfiable
((PCChoiceGenerator) cg).setCurrentPC(pc);
// set the result
IntegerExpression result;
if (sym_v2 != null) result = sym_v2._div(sym_v1);
else result = sym_v1._div_reverse(v2);
sf = th.getModifiableTopFrame();
sf.setOperandAttr(result);
return getNext(th);
} else {
th.getVM().getSystemState().setIgnored(true);
return getNext(th);
}
}
}