Richard Smith | e0d3b4c | 2012-05-03 18:27:39 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 -Wimplicit-fallthrough %s |
Ted Kremenek | 3078353 | 2012-11-12 21:20:48 +0000 | [diff] [blame] | 2 | // XFAIL: * |
Richard Smith | e0d3b4c | 2012-05-03 18:27:39 +0000 | [diff] [blame] | 3 | |
Ted Kremenek | 3078353 | 2012-11-12 21:20:48 +0000 | [diff] [blame] | 4 | // NOTE: This test is marked XFAIL until we come up with a good language design |
| 5 | // for a worfklow to use this warning outside of C++11. |
Richard Smith | e0d3b4c | 2012-05-03 18:27:39 +0000 | [diff] [blame] | 6 | |
| 7 | int fallthrough(int n) { |
| 8 | switch (n / 10) { |
| 9 | if (n - 1) { |
| 10 | n = 100; |
| 11 | } else if (n - 2) { |
| 12 | n = 101; |
| 13 | } else if (n - 3) { |
| 14 | n = 102; |
| 15 | } |
| 16 | case -1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'break;' to avoid fall-through}} |
| 17 | ; |
| 18 | case 0: {// expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'break;' to avoid fall-through}} |
| 19 | } |
| 20 | case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'break;' to avoid fall-through}} |
| 21 | n += 100 ; |
| 22 | case 3: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'break;' to avoid fall-through}} |
| 23 | if (n > 0) |
| 24 | n += 200; |
| 25 | case 4: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'break;' to avoid fall-through}} |
| 26 | if (n < 0) |
| 27 | ; |
| 28 | case 5: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'break;' to avoid fall-through}} |
| 29 | switch (n) { |
| 30 | case 111: |
| 31 | break; |
| 32 | case 112: |
| 33 | break; |
| 34 | case 113: |
| 35 | break ; |
| 36 | } |
| 37 | case 6: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'break;' to avoid fall-through}} |
| 38 | n += 300; |
| 39 | } |
| 40 | switch (n / 30) { |
| 41 | case 11: |
| 42 | case 12: // no warning here, intended fall-through, no statement between labels |
| 43 | n += 1600; |
| 44 | } |
| 45 | switch (n / 40) { |
| 46 | case 13: |
| 47 | if (n % 2 == 0) { |
| 48 | return 1; |
| 49 | } else { |
| 50 | return 2; |
| 51 | } |
| 52 | case 15: // no warning here, there's no fall-through |
| 53 | n += 3200; |
| 54 | } |
| 55 | switch (n / 50) { |
| 56 | case 17: { |
| 57 | if (n % 2 == 0) { |
| 58 | return 1; |
| 59 | } else { |
| 60 | return 2; |
| 61 | } |
| 62 | } |
| 63 | case 19: { // no warning here, there's no fall-through |
| 64 | n += 6400; |
| 65 | return 3; |
| 66 | } |
| 67 | case 21: { // no warning here, there's no fall-through |
| 68 | break; |
| 69 | } |
| 70 | case 23: // no warning here, there's no fall-through |
| 71 | n += 128000; |
| 72 | break; |
| 73 | case 25: // no warning here, there's no fall-through |
| 74 | break; |
| 75 | } |
| 76 | |
| 77 | return n; |
| 78 | } |
| 79 | |
| 80 | class ClassWithDtor { |
| 81 | public: |
| 82 | ~ClassWithDtor() {} |
| 83 | }; |
| 84 | |
| 85 | void fallthrough2(int n) { |
| 86 | switch (n) { |
| 87 | case 0: |
| 88 | { |
| 89 | ClassWithDtor temp; |
| 90 | break; |
| 91 | } |
| 92 | default: // no warning here, there's no fall-through |
| 93 | break; |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | #define MY_SWITCH(X, Y, Z, U, V) switch (X) { case Y: Z; case U: V; } |
| 98 | #define MY_SWITCH2(X, Y, Z) switch (X) { Y; Z; } |
| 99 | #define MY_CASE(X, Y) case X: Y |
| 100 | #define MY_CASE2(X, Y, U, V) case X: Y; case U: V |
| 101 | |
| 102 | int fallthrough_macro1(int n) { |
| 103 | MY_SWITCH(n, 13, n *= 2, 14, break) // expected-warning{{unannotated fall-through between switch labels}} |
| 104 | |
| 105 | switch (n + 1) { |
| 106 | MY_CASE(33, n += 2); |
| 107 | MY_CASE(44, break); // expected-warning{{unannotated fall-through between switch labels}} |
| 108 | MY_CASE(55, n += 3); |
| 109 | } |
| 110 | |
| 111 | switch (n + 3) { |
| 112 | MY_CASE(333, return 333); |
| 113 | MY_CASE2(444, n += 44, 4444, break); // expected-warning{{unannotated fall-through between switch labels}} |
| 114 | MY_CASE(555, n += 33); |
| 115 | } |
| 116 | |
| 117 | MY_SWITCH2(n + 4, MY_CASE(17, n *= 3), MY_CASE(19, break)) // expected-warning{{unannotated fall-through between switch labels}} |
| 118 | |
| 119 | MY_SWITCH2(n + 5, MY_CASE(21, break), MY_CASE2(23, n *= 7, 25, break)) // expected-warning{{unannotated fall-through between switch labels}} |
| 120 | |
| 121 | return n; |
| 122 | } |