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import org.checkerframework.checker.index.qual.LTLengthOf;
import org.checkerframework.common.value.qual.MinLen;
import org.checkerframework.framework.qual.ConditionalPostconditionAnnotation;
import org.checkerframework.framework.qual.JavaExpression;
import org.checkerframework.framework.qual.PostconditionAnnotation;
import org.checkerframework.framework.qual.PreconditionAnnotation;
import org.checkerframework.framework.qual.QualifierArgument;
public class CustomContractWithArgs {
// Postcondition for MinLen
@PostconditionAnnotation(qualifier = MinLen.class)
@interface EnsuresMinLen {
public String[] value();
@QualifierArgument("value")
public int targetValue();
}
// Conditional postcondition for LTLengthOf
@ConditionalPostconditionAnnotation(qualifier = LTLengthOf.class)
@interface EnsuresLTLIf {
public boolean result();
public String[] expression();
@JavaExpression
@QualifierArgument("value")
public String[] targetValue();
@JavaExpression
@QualifierArgument("offset")
public String[] targetOffset();
}
// Precondition for LTLengthOf
@PreconditionAnnotation(qualifier = LTLengthOf.class)
@interface RequiresLTL {
public String[] value();
@JavaExpression
@QualifierArgument("value")
public String[] targetValue();
@JavaExpression
@QualifierArgument("offset")
public String[] targetOffset();
}
class Base {
@EnsuresMinLen(value = "#1", targetValue = 10)
void minLenContract(int[] a) {
if (a.length < 10) throw new RuntimeException();
}
@EnsuresMinLen(value = "#1", targetValue = 10)
// :: error: (contracts.postcondition.not.satisfied)
void minLenWrong(int[] a) {
if (a.length < 9) throw new RuntimeException();
}
void minLenUse(int[] b) {
minLenContract(b);
int @MinLen(10) [] c = b;
}
public int b, y;
@EnsuresLTLIf(
expression = "b",
targetValue = {"#1", "#1"},
targetOffset = {"#2 + 1", "10"},
result = true)
boolean ltlPost(int[] a, int c) {
if (b < a.length - c - 1 && b < a.length - 10) {
return true;
} else {
return false;
}
}
@EnsuresLTLIf(expression = "b", targetValue = "#1", targetOffset = "#3", result = true)
// :: error: (flowexpr.parse.error)
boolean ltlPostInvalid(int[] a, int c) {
return false;
}
@RequiresLTL(
value = "b",
targetValue = {"#1", "#1"},
targetOffset = {"#2 + 1", "-10"})
void ltlPre(int[] a, int c) {
@LTLengthOf(value = "a", offset = "c+1") int i = b;
}
void ltlUse(int[] a, int c) {
if (ltlPost(a, c)) {
@LTLengthOf(value = "a", offset = "c+1") int i = b;
ltlPre(a, c);
}
// :: error: (assignment.type.incompatible)
@LTLengthOf(value = "a", offset = "c+1") int j = b;
}
}
class Derived extends Base {
public int x;
@Override
@EnsuresLTLIf(
expression = "b ",
targetValue = {"#1", "#1"},
targetOffset = {"#2 + 1", "11"},
result = true)
boolean ltlPost(int[] a, int d) {
return false;
}
@Override
@RequiresLTL(
value = "b ",
targetValue = {"#1", "#1"},
targetOffset = {"#2 + 1", "-11"})
void ltlPre(int[] a, int d) {
@LTLengthOf(
value = {"a", "a"},
offset = {"d+1", "-10"})
// :: error: (assignment.type.incompatible)
int i = b;
}
}
class DerivedInvalid extends Base {
public int x;
@Override
@EnsuresLTLIf(
expression = "b ",
targetValue = {"#1", "#1"},
targetOffset = {"#2 + 1", "9"},
result = true)
// :: error: (contracts.conditional.postcondition.true.override.invalid)
boolean ltlPost(int[] a, int c) {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return true;
}
@Override
@RequiresLTL(
value = "b ",
targetValue = {"#1", "#1"},
targetOffset = {"#2 + 1", "-9"})
// :: error: (contracts.precondition.override.invalid)
void ltlPre(int[] a, int d) {
@LTLengthOf(
value = {"a", "a"},
offset = {"d+1", "-10"})
int i = b;
}
}
}
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