derek.holloway
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106 lines
6.4 KiB
C
106 lines
6.4 KiB
C
// RUN: %clang_cc1 -verify=expected,c-expected -std=c2y -Wall -pedantic %s
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// RUN: %clang_cc1 -verify=expected,c-expected,ped -std=c23 -Wall -pedantic %s
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// RUN: %clang_cc1 -verify=expected,cxx-expected,gnu -Wall -pedantic -x c++ %s
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// RUN: %clang_cc1 -verify=expected,c-expected,pre -std=c2y -Wpre-c2y-compat -Wall -pedantic %s
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/* WG14 N3370: Yes
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* Case range expressions v3.1
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*
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* This introduces the ability to specify closed ranges in case statements in a
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* switch statement. This was already a well-supported Clang extension before
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* it was standardized.
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*/
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void correct(int i) {
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constexpr int j = 100, k = 200;
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switch (i) {
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case 12 ... 14: break; /* gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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// Implementations are encouraged to diagnose empty ranges.
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case 15 ... 11: break; /* expected-warning {{empty case range specified}}
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gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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// This is not an empty range, it's a range of a single value.
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case 10 ... 10: break; /* gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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case j ... k: break; /* gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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}
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}
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void incorrect(int i) { // cxx-expected-note 2 {{declared here}}
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switch (i) {
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// The values have to be integer constant expressions. Note that when the
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// initial value in the range is an error, we don't issue the warnings about
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// extensions or incompatibility.
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case i ... 10: break; /* c-expected-error {{expression is not an integer constant expression}}
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cxx-expected-error {{case value is not a constant expression}}
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cxx-expected-note {{function parameter 'i' with unknown value cannot be used in a constant expression}}
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*/
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case 10 ... i: break; /* c-expected-error {{expression is not an integer constant expression}}
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cxx-expected-error {{case value is not a constant expression}}
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cxx-expected-note {{function parameter 'i' with unknown value cannot be used in a constant expression}}
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gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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case 1.3f ... 10: break; /* c-expected-error {{integer constant expression must have integer type, not 'float'}}
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cxx-expected-error {{conversion from 'float' to 'int' is not allowed in a converted constant expression}}
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*/
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case 10 ... "a": break; /* c-expected-error {{integer constant expression must have integer type, not 'char[2]'}}
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cxx-expected-error {{value of type 'const char[2]' is not implicitly convertible to 'int'}}
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gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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}
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switch (i) {
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// Cannot have multiple cases covering the same value.
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// FIXME: diagnostic quality here is poor. The "previous case" note is
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// showing up on a subsequent line (I'd expect the error and note to be
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// reversed), and "duplicate case value 20" is showing up on a line where
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// there is no duplicate value 20 to begin with.
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case 10 ... 20: break; /* expected-error {{duplicate case value '11'}}
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expected-note {{previous case defined here}}
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gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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case 11: break; /* expected-note {{previous case defined here}}
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*/
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case 11 ... 14: break; /* expected-error {{duplicate case value '20'}}
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gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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}
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// The values specified by the range shall not change as a result of
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// conversion to the promoted type of the controlling expression.
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// FIXME: the overflow warnings seem like they probably should also trigger
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// in C++ as they do in C.
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switch ((unsigned char)i) {
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case 254 ... 256: break; /* c-expected-warning {{overflow converting case value to switch condition type (256 to 0)}}
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gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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case 257 ... 258: break; /* c-expected-warning {{overflow converting case value to switch condition type (257 to 1)}}
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c-expected-warning {{overflow converting case value to switch condition type (258 to 2)}}
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gnu-warning {{case ranges are a GNU extension}}
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ped-warning {{case ranges are a C2y extension}}
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pre-warning {{case ranges are incompatible with C standards before C2y}}
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*/
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}
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}
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