| 1 | // RUN: %clang_cc1 -fsyntax-only -std=c++1z -verify %s |
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| 2 | |
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| 3 | void f(int n) { |
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| 4 | switch (n) { |
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| 5 | case 0: |
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| 6 | n += 1; |
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| 7 | [[fallthrough]]; // ok |
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| 8 | case 1: |
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| 9 | if (n) { |
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| 10 | [[fallthrough]]; // ok |
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| 11 | } else { |
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| 12 | return; |
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| 13 | } |
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| 14 | case 2: |
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| 15 | for (int n = 0; n != 10; ++n) |
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| 16 | [[fallthrough]]; // expected-error {{does not directly precede switch label}} |
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| 17 | case 3: |
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| 18 | while (true) |
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| 19 | [[fallthrough]]; // expected-error {{does not directly precede switch label}} |
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| 20 | case 4: |
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| 21 | while (false) |
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| 22 | [[fallthrough]]; // expected-error {{does not directly precede switch label}} |
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| 23 | case 5: |
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| 24 | do [[fallthrough]]; while (true); // expected-error {{does not directly precede switch label}} |
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| 25 | case 6: |
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| 26 | do [[fallthrough]]; while (false); // expected-error {{does not directly precede switch label}} |
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| 27 | case 7: |
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| 28 | switch (n) { |
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| 29 | case 0: |
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| 30 | // FIXME: This should be an error, even though the next thing we do is to |
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| 31 | // fall through in an outer switch statement. |
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| 32 | [[fallthrough]]; |
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| 33 | } |
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| 34 | case 8: |
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| 35 | [[fallthrough]]; // expected-error {{does not directly precede switch label}} |
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| 36 | goto label; |
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| 37 | label: |
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| 38 | case 9: |
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| 39 | n += 1; |
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| 40 | case 10: // no warning, -Wimplicit-fallthrough is not enabled in this test, and does not need to |
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| 41 | // be enabled for these diagnostics to be produced. |
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| 42 | break; |
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| 43 | } |
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| 44 | } |
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| 45 | |
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| 46 | [[fallthrough]] typedef int n; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} |
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| 47 | typedef int [[fallthrough]] n; // expected-error {{'fallthrough' attribute cannot be applied to types}} |
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| 48 | typedef int n [[fallthrough]]; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} |
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| 49 | |
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| 50 | enum [[fallthrough]] E {}; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} |
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| 51 | class [[fallthrough]] C {}; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} |
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| 52 | |
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| 53 | [[fallthrough]] // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} |
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| 54 | void g() { |
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| 55 | [[fallthrough]] int n; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} |
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| 56 | [[fallthrough]] ++n; // expected-error-re {{{{^}}fallthrough attribute is only allowed on empty statements}} |
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| 57 | |
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| 58 | switch (n) { |
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| 59 | // FIXME: This should be an error. |
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| 60 | [[fallthrough]]; |
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| 61 | return; |
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| 62 | |
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| 63 | case 0: |
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| 64 | [[fallthrough, fallthrough]]; // expected-error {{multiple times}} |
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| 65 | case 1: |
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| 66 | [[fallthrough(0)]]; // expected-error {{argument list}} |
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| 67 | case 2: |
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| 68 | break; |
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| 69 | } |
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| 70 | } |
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| 71 | |
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