1// RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -analyzer-store=region -verify -Wno-objc-root-class %s
2
3extern void clang_analyzer_warnIfReached();
4void clang_analyzer_eval(int);
5
6@interface SomeClass
7-(id)someMethodWithReturn;
8-(void)someMethod;
9@end
10
11void consistencyOfReturnWithNilReceiver(SomeClass *o) {
12  id result = [o someMethodWithReturn];
13  if (result) {
14    if (!o) {
15      // It is impossible for both o to be nil and result to be non-nil,
16      // so this should not be reached.
17      clang_analyzer_warnIfReached(); // no-warning
18    }
19  }
20}
21
22void maybeNilReceiverIsNotNilAfterMessage(SomeClass *o) {
23  [o someMethod];
24
25  // We intentionally drop the nil flow (losing coverage) after a method
26  // call when the receiver may be nil in order to avoid inconsistencies of
27  // the kind tested for in consistencyOfReturnWithNilReceiver().
28  clang_analyzer_eval(o != 0); // expected-warning{{TRUE}}
29}
30
31void nilReceiverIsStillNilAfterMessage(SomeClass *o) {
32  if (o == 0) {
33    id result = [o someMethodWithReturn];
34
35    // Both the receiver and the result should be nil after a message
36    // sent to a nil receiver returning a value of type id.
37    clang_analyzer_eval(o == 0); // expected-warning{{TRUE}}
38    clang_analyzer_eval(result == 0); // expected-warning{{TRUE}}
39  }
40}
41