@Override
public Instruction execute(ThreadInfo th) {
IntegerExpression sym_lval =
(IntegerExpression) th.getModifiableTopFrame().getLongOperandAttr();
if (sym_lval == null) {
return super.execute(th);
} else {
// throw new RuntimeException("## Error: symbolic L2F not yet hanled ");
// here we get a hold of the current path condition and
// add an extra mixed constraint sym_dval==sym_ival
ChoiceGenerator<?> cg;
if (!th.isFirstStepInsn()) { // first time around
cg = new PCChoiceGenerator(1); // only one choice
th.getVM().getSystemState().setNextChoiceGenerator(cg);
return this;
} else { // this is what really returns results
cg = th.getVM().getSystemState().getChoiceGenerator();
assert (cg instanceof PCChoiceGenerator) : "expected PCChoiceGenerator, got: " + cg;
}
// get the path condition from the
// previous choice generator of the same type
PathCondition pc;
ChoiceGenerator<?> prev_cg = cg.getPreviousChoiceGenerator();
while (!((prev_cg == null) || (prev_cg instanceof PCChoiceGenerator))) {
prev_cg = prev_cg.getPreviousChoiceGenerator();
}
if (prev_cg == null)
pc = new PathCondition(); // TODO: handling of preconditions needs to be changed
else pc = ((PCChoiceGenerator) prev_cg).getCurrentPC();
assert pc != null;
StackFrame sf = th.getModifiableTopFrame();
sf.popLong();
sf.push(0, false); // for symbolic expressions, the concrete value does not matter
SymbolicReal sym_fval = new SymbolicReal();
sf.setOperandAttr(sym_fval);
pc._addDet(Comparator.EQ, sym_fval, sym_lval);
if (!pc.simplify()) { // not satisfiable
th.getVM().getSystemState().setIgnored(true);
} else {
// pc.solve();
((PCChoiceGenerator) cg).setCurrentPC(pc);
// System.out.println(((PCChoiceGenerator) cg).getCurrentPC());
}
// System.out.println("Execute L2F: " + sf.getLongOperandAttr());
return getNext(th);
}
}
protected void popValue(StackFrame frame) {
value = Double.longBitsToDouble(frame.popLong());
}
@Override
public Instruction execute(ThreadInfo th) {
StackFrame sf = th.getModifiableTopFrame();
IntegerExpression sym_v1 = (IntegerExpression) sf.getOperandAttr(1);
IntegerExpression sym_v2 = (IntegerExpression) sf.getOperandAttr(3);
long 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.popLong();
v2 = sf.popLong();
if (v1 == 0) return th.createAndThrowException("java.lang.ArithmeticException", "div by 0");
sf.pushLong(0);
IntegerExpression result = sym_v2._div(v1);
sf.setLongOperandAttr(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().getSystemState().setNextChoiceGenerator(cg);
return this;
} else { // this is what really returns results
cg = th.getVM().getSystemState().getChoiceGenerator();
assert (cg instanceof PCChoiceGenerator) : "expected PCChoiceGenerator, got: " + cg;
condition = (Integer) cg.getNextChoice() == 0 ? false : true;
}
v1 = sf.popLong();
v2 = sf.popLong();
sf.pushLong(0);
PathCondition pc;
ChoiceGenerator<?> prev_cg = cg.getPreviousChoiceGenerator();
while (!((prev_cg == null) || (prev_cg instanceof PCChoiceGenerator))) {
prev_cg = prev_cg.getPreviousChoiceGenerator();
}
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.setLongOperandAttr(result);
return getNext(th);
} else {
th.getVM().getSystemState().setIgnored(true);
return getNext(th);
}
}
}
