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import org.checkerframework.checker.nullness.qual.*;
public class FlowLoop {
void simpleWhileLoop() {
String s = "m";
while (s != null) {
s.toString();
s = null;
}
// :: error: (dereference.of.nullable)
s.toString(); // error
}
void whileConditionError() {
String s = "m";
// :: error: (dereference.of.nullable)
while (s.toString() == "m") { // error
s.toString();
s = null;
}
s.toString();
}
void simpleForLoop() {
for (String s = "m"; s != null; s = null) {
s.toString();
}
}
void forLoopConditionError() {
for (String s = "m";
// :: error: (dereference.of.nullable)
s.toString() != "m"; // error
s = null) {
s.toString();
}
}
class Link {
Object val;
@Nullable Link next;
public Link(Object val, @Nullable Link next) {
this.val = val;
this.next = next;
}
}
// Both dereferences of l should succeed
void test(@Nullable Link in) {
for (@Nullable Link l = in; l != null; l = l.next) {
Object o;
o = l.val;
}
}
void multipleRuns() {
String s = "m";
while (true) {
// :: error: (dereference.of.nullable)
s.toString(); // error
s = null;
}
}
void multipleRunsDo() {
String s = "m";
do {
// :: error: (dereference.of.nullable)
s.toString(); // error
s = null;
} while (true);
}
void alwaysRunForLoop() {
String s = "m";
for (s = null; s != null; s = "m") {
s.toString(); // ok
}
// :: error: (dereference.of.nullable)
s.toString(); // error
}
public void badIterator() {
Class<?> opt_doc1 = null;
// :: error: (dereference.of.nullable)
opt_doc1.getInterfaces();
Class<?> opt_doc2 = null;
// :: error: (dereference.of.nullable)
for (Class<? extends @Nullable Object> fd : opt_doc2.getInterfaces()) {
// empty loop body
}
}
void testContinue(@Nullable Object o) {
for (; ; ) {
// :: error: (dereference.of.nullable)
o.toString();
if (true) continue;
}
}
void testBreak(@Nullable Object o) {
while (true) {
// :: error: (dereference.of.nullable)
o.toString();
if (true) break;
}
}
void testSimpleNull() {
String r1 = null;
while (r1 != null) ;
// :: error: (dereference.of.nullable)
r1.toString(); // error
}
void testMulticheckNull() {
String r1 = null;
while (r1 != null && r1.equals("m")) ;
// :: error: (dereference.of.nullable)
r1.toString(); // error
}
void testAssignInLoopSimple() {
String r1 = "";
while (r1 != null) {
r1 = null;
}
// :: error: (dereference.of.nullable)
r1.toString(); // error
}
void testAssignInLoopMulti() {
String r1 = "";
while (r1 != null && r1.isEmpty()) {
r1 = null;
}
// :: error: (dereference.of.nullable)
r1.toString(); // error
}
void testBreakWithCheck() {
String s = null;
while (true) {
if (s == null) break;
s.toString();
}
}
void test1() {
while (true) {
String s = null;
if (s == null) {
return;
}
s.toString();
}
}
}
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