| 1 | // RUN: %clang_analyze_cc1 -x c++ -analyzer-checker=core -analyzer-output=text -verify %s |
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| 2 | |
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| 3 | typedef unsigned char uint8_t; |
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| 4 | |
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| 5 | #define UINT8_MAX 255 |
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| 6 | #define TCP_MAXWIN 65535 |
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| 7 | |
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| 8 | uint8_t get_uint8_max() { |
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| 9 | uint8_t rcvscale = UINT8_MAX; // expected-note{{'rcvscale' initialized to 255}} |
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| 10 | return rcvscale; // expected-note{{Returning the value 255 (loaded from 'rcvscale')}} |
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| 11 | } |
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| 12 | |
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| 13 | void shift_by_undefined_value() { |
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| 14 | uint8_t shift_amount = get_uint8_max(); // expected-note{{'shift_amount' initialized to 255}} |
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| 15 | // expected-note@-1{{Calling 'get_uint8_max'}} |
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| 16 | // expected-note@-2{{Returning from 'get_uint8_max'}} |
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| 17 | (void)(TCP_MAXWIN << shift_amount); // expected-warning{{The result of the left shift is undefined due to shifting by '255', which is greater or equal to the width of type 'int'}} |
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| 18 | // expected-note@-1{{The result of the left shift is undefined due to shifting by '255', which is greater or equal to the width of type 'int'}} |
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| 19 | } |
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| 20 | |
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