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/* This example causes an error when computing the GLB of two types
* because the GLB is empty. */
class FieldInstruction {}
class GETFIELD extends FieldInstruction {}
class PUTFIELD extends FieldInstruction {}
class InstanceOf {
public void emptyGLB(FieldInstruction f) {
if (f instanceof GETFIELD || f instanceof PUTFIELD) {
if (f instanceof PUTFIELD) {
// During org.checkerframework.dataflow analysis, we can believe that f is both a
// GETFIELD and a PUTFIELD, which yields an empty GLB. Once
// org.checkerframework.dataflow converges, it will know that f is a PUTFIELD.
return;
}
return;
}
}
public boolean assignInstanceOf(Object obj) {
// We fixed a bug where the type in an instanceof expression
// like Class<?> was stored as the abstract value result of
// the expression.
boolean is_class = obj instanceof Class<?>;
return is_class;
}
}
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