// RUN: %clang_cc1 -fsyntax-only -fdouble-square-bracket-attributes -verify %s void f(int n) { switch (n) { case 0: n += 1; [[fallthrough]]; // ok case 1: if (n) { [[fallthrough]]; // ok } else { return; } case 2: for (int n = 0; n != 10; ++n) [[fallthrough]]; // expected-error {{does not directly precede switch label}} case 3: while (1) [[fallthrough]]; // expected-error {{does not directly precede switch label}} case 4: while (0) [[fallthrough]]; // expected-error {{does not directly precede switch label}} case 5: do [[fallthrough]]; while (1); // expected-error {{does not directly precede switch label}} case 6: do [[fallthrough]]; while (0); // expected-error {{does not directly precede switch label}} case 7: switch (n) { case 0: // FIXME: This should be an error, even though the next thing we do is to // fall through in an outer switch statement. [[fallthrough]]; } case 8: [[fallthrough]]; // expected-error {{does not directly precede switch label}} goto label; label: case 9: n += 1; case 10: // no warning, -Wimplicit-fallthrough is not enabled in this test, and does not need to // be enabled for these diagnostics to be produced. break; } } [[fallthrough]] typedef int n1; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} typedef int [[fallthrough]] n2; // expected-error {{'fallthrough' attribute cannot be applied to types}} typedef int n3 [[fallthrough]]; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} enum [[fallthrough]] E { // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} One }; struct [[fallthrough]] S { // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} int i; }; [[fallthrough]] // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} void g(void) { [[fallthrough]] int n; // expected-error {{'fallthrough' attribute cannot be applied to a declaration}} [[fallthrough]] ++n; // expected-error-re {{{{^}}fallthrough attribute is only allowed on empty statements}} switch (n) { // FIXME: This should be an error. [[fallthrough]]; return; case 0: [[fallthrough, fallthrough]]; // expected-error {{multiple times}} case 1: [[fallthrough(0)]]; // expected-error {{argument list}} case 2: break; } } |