Alexander Kornienko | 66da0ab | 2012-09-28 22:24:03 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wimplicit-fallthrough -DCOMMAND_LINE_FALLTHROUGH=[[clang::fallthrough]] %s |
| 2 | |
| 3 | int fallthrough_compatibility_macro_from_command_line(int n) { |
| 4 | switch (n) { |
| 5 | case 0: |
| 6 | n = n * 10; |
| 7 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'COMMAND_LINE_FALLTHROUGH;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}} |
| 8 | ; |
| 9 | } |
| 10 | return n; |
| 11 | } |
| 12 | |
| 13 | #ifdef __clang__ |
| 14 | #if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough") |
| 15 | #define COMPATIBILITY_FALLTHROUGH [ [ /* test */ clang /* test */ \ |
| 16 | :: fallthrough ] ] // testing whitespace and comments in macro definition |
| 17 | #endif |
| 18 | #endif |
| 19 | |
| 20 | #ifndef COMPATIBILITY_FALLTHROUGH |
| 21 | #define COMPATIBILITY_FALLTHROUGH do { } while (0) |
| 22 | #endif |
| 23 | |
| 24 | int fallthrough_compatibility_macro_from_source(int n) { |
| 25 | switch (n) { |
| 26 | case 0: |
| 27 | n = n * 20; |
| 28 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'COMPATIBILITY_FALLTHROUGH;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}} |
| 29 | ; |
| 30 | } |
| 31 | return n; |
| 32 | } |
| 33 | |
| 34 | // Deeper macro substitution |
| 35 | #define M1 [[clang::fallthrough]] |
| 36 | #ifdef __clang__ |
| 37 | #define M2 M1 |
| 38 | #else |
| 39 | #define M2 |
| 40 | #endif |
| 41 | |
| 42 | #define WRONG_MACRO1 clang::fallthrough |
| 43 | #define WRONG_MACRO2 [[clang::fallthrough] |
| 44 | #define WRONG_MACRO3 [[clang::fall through]] |
| 45 | #define WRONG_MACRO4 [[clang::fallthrough]]] |
| 46 | |
| 47 | int fallthrough_compatibility_macro_in_macro(int n) { |
| 48 | switch (n) { |
| 49 | case 0: |
| 50 | n = n * 20; |
| 51 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'M1;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}} |
| 52 | // there was an idea that this ^ should be M2 |
| 53 | ; |
| 54 | } |
| 55 | return n; |
| 56 | } |
| 57 | |
| 58 | #undef M1 |
| 59 | #undef M2 |
| 60 | #undef COMPATIBILITY_FALLTHROUGH |
| 61 | #undef COMMAND_LINE_FALLTHROUGH |
| 62 | |
| 63 | int fallthrough_compatibility_macro_undefined(int n) { |
| 64 | switch (n) { |
| 65 | case 0: |
| 66 | n = n * 20; |
| 67 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert '[[clang::fallthrough]];' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}} |
| 68 | ; |
| 69 | } |
| 70 | #define TOO_LATE [[clang::fallthrough]] |
| 71 | return n; |
| 72 | } |
| 73 | #undef TOO_LATE |
| 74 | |
| 75 | #define MACRO_WITH_HISTORY 11111111 |
| 76 | #undef MACRO_WITH_HISTORY |
| 77 | #define MACRO_WITH_HISTORY [[clang::fallthrough]] |
| 78 | #undef MACRO_WITH_HISTORY |
| 79 | #define MACRO_WITH_HISTORY 2222222 |
| 80 | |
| 81 | int fallthrough_compatibility_macro_history(int n) { |
| 82 | switch (n) { |
| 83 | case 0: |
| 84 | n = n * 20; |
| 85 | #undef MACRO_WITH_HISTORY |
| 86 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert '[[clang::fallthrough]];' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}} |
| 87 | ; |
| 88 | #define MACRO_WITH_HISTORY [[clang::fallthrough]] |
| 89 | } |
| 90 | return n; |
| 91 | } |
| 92 | |
| 93 | #undef MACRO_WITH_HISTORY |
| 94 | #define MACRO_WITH_HISTORY 11111111 |
| 95 | #undef MACRO_WITH_HISTORY |
| 96 | #define MACRO_WITH_HISTORY [[clang::fallthrough]] |
| 97 | #undef MACRO_WITH_HISTORY |
| 98 | #define MACRO_WITH_HISTORY 2222222 |
| 99 | #undef MACRO_WITH_HISTORY |
| 100 | |
| 101 | int fallthrough_compatibility_macro_history2(int n) { |
| 102 | switch (n) { |
| 103 | case 0: |
| 104 | n = n * 20; |
| 105 | #define MACRO_WITH_HISTORY [[clang::fallthrough]] |
| 106 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'MACRO_WITH_HISTORY;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}} |
| 107 | ; |
| 108 | #undef MACRO_WITH_HISTORY |
| 109 | #define MACRO_WITH_HISTORY 3333333 |
| 110 | #undef MACRO_WITH_HISTORY |
| 111 | #define MACRO_WITH_HISTORY 4444444 |
| 112 | #undef MACRO_WITH_HISTORY |
| 113 | #define MACRO_WITH_HISTORY 5555555 |
| 114 | } |
| 115 | return n; |
| 116 | } |
| 117 | |
| 118 | template<const int N> |
| 119 | int fallthrough_compatibility_macro_history_template(int n) { |
| 120 | switch (N * n) { |
| 121 | case 0: |
| 122 | n = n * 20; |
| 123 | #define MACRO_WITH_HISTORY2 [[clang::fallthrough]] |
| 124 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'MACRO_WITH_HISTORY2;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}} |
| 125 | ; |
| 126 | #undef MACRO_WITH_HISTORY2 |
| 127 | #define MACRO_WITH_HISTORY2 3333333 |
| 128 | } |
| 129 | return n; |
| 130 | } |
| 131 | |
| 132 | #undef MACRO_WITH_HISTORY2 |
| 133 | #define MACRO_WITH_HISTORY2 4444444 |
| 134 | #undef MACRO_WITH_HISTORY2 |
| 135 | #define MACRO_WITH_HISTORY2 5555555 |
| 136 | |
| 137 | void f() { |
| 138 | fallthrough_compatibility_macro_history_template<1>(0); // expected-note{{in instantiation of function template specialization 'fallthrough_compatibility_macro_history_template<1>' requested here}} |
| 139 | } |