c74ab84ea2
`[[clang::fallthrough]]` has meaning for the CFG, but all other StmtAttrs we currently have don't. So omit them, as AttributedStatements with children cause several issues and there's no benefit in including them. Fixes PR52103 and PR49454. See PR52103 for details. Differential Revision: https://reviews.llvm.org/D111568
102 lines
2.0 KiB
C++
102 lines
2.0 KiB
C++
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -Wunreachable-code-aggressive -fblocks -verify %s
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int j;
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int bar();
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int test1() {
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for (int i = 0;
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i != 10;
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++i) { // expected-warning {{loop will run at most once (loop increment never executed)}}
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if (j == 23) // missing {}'s
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bar();
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return 1;
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}
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return 0;
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return 1; // expected-warning {{will never be executed}}
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}
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int test1_B() {
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for (int i = 0;
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i != 10;
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++i) { // expected-warning {{loop will run at most once (loop increment never executed)}}
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if (j == 23) // missing {}'s
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bar();
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return 1;
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}
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return 0;
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return bar(); // expected-warning {{will never be executed}}
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}
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void test2(int i) {
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switch (i) {
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case 0:
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break;
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bar(); // expected-warning {{will never be executed}}
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case 2:
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switch (i) {
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default:
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a: goto a;
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}
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bar(); // expected-warning {{will never be executed}}
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}
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b: goto b;
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bar(); // expected-warning {{will never be executed}}
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}
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void test3() {
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^{ return;
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bar(); // expected-warning {{will never be executed}}
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}();
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while (++j) {
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continue;
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bar(); // expected-warning {{will never be executed}}
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}
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}
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// PR 6130 - Don't warn about bogus unreachable code with throw's and
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// temporary objects.
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class PR6130 {
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public:
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PR6130();
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~PR6130();
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};
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int pr6130(unsigned i) {
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switch(i) {
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case 0: return 1;
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case 1: return 2;
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default:
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throw PR6130(); // no-warning
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}
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}
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extern "C" void foo(void);
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extern "C" __attribute__((weak)) decltype(foo) foo;
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void weak_redecl() {
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if (foo)
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return;
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bar(); // no-warning
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}
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namespace pr52103 {
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void g(int a);
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void f(int a) {
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if (a > 4) [[ likely ]] { // no-warning
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return;
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}
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if (a > 4) [[ unlikely ]] { // no-warning
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return;
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return; // expected-warning {{will never be executed}}
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}
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[[clang::musttail]] return g(a); // no-warning
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[[clang::musttail]] return g(a); // expected-warning {{will never be executed}}
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}
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}
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