27a972a699
(This relands 59337263ab45d7657e and makes sure comma operator diagnostics are suppressed in a SFINAE context.) While at it, add the diagnosis message "left operand of comma operator has no effect" (used by GCC) for comma operator. This also makes Clang diagnose in the constant evaluation context which aligns with GCC/MSVC behavior. (https://godbolt.org/z/7zxb8Tx96) Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D103938
60 lines
2.6 KiB
C
60 lines
2.6 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-apple-darwin10 %s
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// RUN: %clang_cc1 -x c++ -fsyntax-only -verify -triple x86_64-apple-darwin10 %s
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// RUN: %clang_cc1 -x c++ -fsyntax-only -verify -triple x86_64-apple-darwin10 -std=c++98 %s
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// RUN: %clang_cc1 -x c++ -fsyntax-only -verify -triple x86_64-apple-darwin10 -std=c++11 %s
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// rdar://11577384
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// rdar://13423975
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int f(int i) {
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switch (i) {
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case 2147483647 + 2:
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#if (__cplusplus <= 199711L) // C or C++03 or earlier modes
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// expected-warning@-2 {{overflow in expression; result is -2147483647 with type 'int'}}
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#else
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// expected-error@-4 {{case value is not a constant expression}} \
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// expected-note@-4 {{value 2147483649 is outside the range of representable values of type 'int'}}
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#endif
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return 1;
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case 9223372036854775807L * 4:
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#if (__cplusplus <= 199711L)
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// expected-warning@-2 {{overflow in expression; result is -4 with type 'long'}}
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#else
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// expected-error@-4 {{case value is not a constant expression}} \
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// expected-note@-4 {{value 36893488147419103228 is outside the range of representable values of type 'long'}}
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#endif
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return 2;
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case (123456 *789012) + 1:
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#if (__cplusplus <= 199711L)
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// expected-warning@-2 {{overflow in expression; result is -1375982336 with type 'int'}}
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#else
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// expected-error@-4 {{case value is not a constant expression}} \
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// expected-note@-4 {{value 97408265472 is outside the range of representable values of type 'int'}}
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#endif
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return 3;
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case (2147483647*4)/4:
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#if (__cplusplus <= 199711L)
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// expected-warning@-2 {{overflow in expression; result is -4 with type 'int'}}
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#else
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// expected-error@-4 {{case value is not a constant expression}} \
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// expected-note@-4 {{value 8589934588 is outside the range of representable values of type 'int'}}
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#endif
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case (2147483647*4)%4:
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#if (__cplusplus <= 199711L)
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// expected-warning@-2 {{overflow in expression; result is -4 with type 'int'}}
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#else
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// expected-error@-4 {{case value is not a constant expression}} \
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// expected-note@-4 {{value 8589934588 is outside the range of representable values of type 'int'}}
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#endif
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return 4;
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case 2147483647:
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return 0;
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}
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return (i, 65537) * 65537; // expected-warning {{overflow in expression; result is 131073 with type 'int'}} \
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// expected-warning {{left operand of comma operator has no effect}}
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}
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// rdar://18405357
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unsigned long long l = 65536 * 65536; // expected-warning {{overflow in expression; result is 0 with type 'int'}}
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unsigned long long l2 = 65536 * (unsigned)65536;
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unsigned long long l3 = 65536 * 65536ULL;
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