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4f902c7ecc
exactly the same as clang's existing [[clang::fallthrough]] attribute, which has been updated to have the same semantics. The one significant difference is that [[fallthrough]] is ill-formed if it's not used immediately before a switch label (even when -Wimplicit-fallthrough is disabled). To support that, we now build a CFG of any function that uses a '[[fallthrough]];' statement to check. In passing, fix some bugs with our support for statement attributes -- in particular, diagnose their use on declarations, rather than asserting. llvm-svn: 262881
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wimplicit-fallthrough-per-function %s
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int fallthrough(int n) {
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switch (n / 10) {
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case 0:
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n += 100;
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case 1: // expected-warning{{unannotated fall-through}} expected-note{{insert '[[clang::fallthrough]];' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
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switch (n) {
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case 111:
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n += 111;
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[[clang::fallthrough]];
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case 112:
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n += 112;
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case 113: // expected-warning{{unannotated fall-through}} expected-note{{insert '[[clang::fallthrough]];' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
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n += 113;
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break ;
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}
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}
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return n;
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}
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int fallthrough2(int n) {
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switch (n / 10) {
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case 0:
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n += 100;
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case 1: // no warning, as we didn't "opt-in" for it in this method
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switch (n) {
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case 111:
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n += 111;
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case 112: // no warning, as we didn't "opt-in" for it in this method
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n += 112;
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case 113: // no warning, as we didn't "opt-in" for it in this method
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n += 113;
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break ;
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}
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}
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return n;
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}
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void unscoped(int n) {
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switch (n % 2) {
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case 0:
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[[fallthrough]];
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case 2:
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[[clang::fallthrough]];
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case 1:
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break;
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}
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}
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