| 1 | // RUN: %clang_cc1 -fsyntax-only -Wno-objc-root-class -verify %s |
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| 2 | |
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| 3 | class S { |
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| 4 | public: |
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| 5 | int a_; |
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| 6 | void s(int a) { |
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| 7 | a_ = a_; // expected-warning {{assigning field to itself}} |
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| 8 | |
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| 9 | // Don't really care about this one either way. |
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| 10 | this->a_ = a_; // expected-warning {{assigning field to itself}} |
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| 11 | |
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| 12 | a_ += a_; // Shouldn't warn. |
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| 13 | } |
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| 14 | }; |
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| 15 | |
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| 16 | void f0(S* s) { |
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| 17 | // Would be nice to have, but not important. |
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| 18 | s->a_ = s->a_; |
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| 19 | } |
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| 20 | |
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| 21 | void f1(S* s, S* t) { |
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| 22 | // Shouldn't warn. |
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| 23 | t->a_ = s->a_; |
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| 24 | } |
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| 25 | |
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| 26 | struct T { |
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| 27 | S* s_; |
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| 28 | }; |
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| 29 | |
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| 30 | void f2(T* t) { |
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| 31 | // Would be nice to have, but even less important. |
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| 32 | t->s_->a_ = t->s_->a_; |
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| 33 | } |
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| 34 | |
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| 35 | void f3(T* t, T* t2) { |
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| 36 | // Shouldn't warn. |
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| 37 | t2->s_->a_ = t->s_->a_; |
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| 38 | } |
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| 39 | |
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| 40 | void f4(int i) { |
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| 41 | // This is a common pattern to silence "parameter unused". Shouldn't warn. |
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| 42 | i = i; |
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| 43 | |
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| 44 | int j = 0; |
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| 45 | j = j; // Likewise. |
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| 46 | } |
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| 47 | |
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| 48 | @interface I { |
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| 49 | int a_; |
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| 50 | } |
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| 51 | @end |
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| 52 | |
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| 53 | @implementation I |
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| 54 | - (void)setA:(int)a { |
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| 55 | a_ = a_; // expected-warning {{assigning instance variable to itself}} |
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| 56 | } |
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| 57 | |
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| 58 | - (void)foo:(I*)i { |
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| 59 | // Don't care much about this warning. |
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| 60 | i->a_ = i->a_; // expected-warning {{assigning instance variable to itself}} |
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| 61 | |
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| 62 | // Shouldn't warn. |
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| 63 | a_ = i->a_; |
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| 64 | i->a_ = a_; |
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| 65 | } |
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| 66 | @end |
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| 67 | |
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