| 1 | // RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -analyzer-store=region -verify -Wno-objc-root-class %s |
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| 2 | |
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| 3 | extern void clang_analyzer_warnIfReached(); |
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| 4 | void clang_analyzer_eval(int); |
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| 5 | |
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| 6 | @interface SomeClass |
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| 7 | -(id)someMethodWithReturn; |
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| 8 | -(void)someMethod; |
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| 9 | @end |
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| 10 | |
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| 11 | void consistencyOfReturnWithNilReceiver(SomeClass *o) { |
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| 12 | id result = [o someMethodWithReturn]; |
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| 13 | if (result) { |
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| 14 | if (!o) { |
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| 15 | // It is impossible for both o to be nil and result to be non-nil, |
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| 16 | // so this should not be reached. |
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| 17 | clang_analyzer_warnIfReached(); // no-warning |
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| 18 | } |
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| 19 | } |
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| 20 | } |
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| 21 | |
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| 22 | void maybeNilReceiverIsNotNilAfterMessage(SomeClass *o) { |
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| 23 | [o someMethod]; |
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| 24 | |
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| 25 | // We intentionally drop the nil flow (losing coverage) after a method |
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| 26 | // call when the receiver may be nil in order to avoid inconsistencies of |
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| 27 | // the kind tested for in consistencyOfReturnWithNilReceiver(). |
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| 28 | clang_analyzer_eval(o != 0); // expected-warning{{TRUE}} |
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| 29 | } |
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| 30 | |
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| 31 | void nilReceiverIsStillNilAfterMessage(SomeClass *o) { |
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| 32 | if (o == 0) { |
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| 33 | id result = [o someMethodWithReturn]; |
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| 34 | |
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| 35 | // Both the receiver and the result should be nil after a message |
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| 36 | // sent to a nil receiver returning a value of type id. |
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| 37 | clang_analyzer_eval(o == 0); // expected-warning{{TRUE}} |
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| 38 | clang_analyzer_eval(result == 0); // expected-warning{{TRUE}} |
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| 39 | } |
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| 40 | } |
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| 41 | |
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