public DiscardInfo isObviousStatically(VarInfo[] vis) {
VarInfo var1 = vis[0];
VarInfo var2 = vis[1];
Object[] obv1 = SubSequence.isObviousSubSequence(var1, var2);
Object[] obv2 = SubSequence.isObviousSubSequence(var2, var1);
if (obv1[1] != null) {
Global.implied_noninstantiated_invariants++;
return new DiscardInfo(this, (DiscardCode) obv1[0], (String) obv1[1]);
} else if (obv2[1] != null) {
Global.implied_noninstantiated_invariants++;
return new DiscardInfo(this, (DiscardCode) obv1[0], (String) obv1[1]);
}
// Don't instantiate if the variables can't have order
if (!var1.aux.getFlag(VarInfoAux.HAS_ORDER) || !var2.aux.getFlag(VarInfoAux.HAS_ORDER)) {
if (debug.isLoggable(Level.FINE)) {
debug.fine(
"Not instantitating for because order has no meaning: "
+ var1.name()
+ " and "
+ var2.name());
}
return new DiscardInfo(
this, DiscardCode.obvious, "Obvious statically since order has no meaning");
}
return super.isObviousStatically(vis);
}
public DiscardInfo isObviousStatically(VarInfo[] vis) {
VarInfo subvar = var1(vis);
VarInfo supervar = var2(vis);
// check for x[i..j] subsequence of x[]
VarInfo subvar_super = subvar.isDerivedSubSequenceOf();
if (subvar_super == supervar) {
debug.fine(" returning true because subvar_super == supervar");
return new DiscardInfo(this, DiscardCode.obvious, "x[i..j] subsequence of x[] is obvious");
}
Object[] obv1 = SubSequence.isObviousSubSequence(subvar, supervar);
if (obv1[1] != null) {
return new DiscardInfo(this, (DiscardCode) obv1[0], (String) obv1[1]);
}
// JHP: This is not a valid obvious check, since it doesn't imply that
// the invariant is true.
if (!subvar.aux.getFlag(VarInfoAux.HAS_ORDER) || !supervar.aux.getFlag(VarInfoAux.HAS_ORDER)) {
// Doesn't make sense to consider subsequence if order doens't matter
return new DiscardInfo(
this, DiscardCode.obvious, "Order doesn't matter, so subsequence is meaningless");
}
return super.isObviousStatically(vis);
}