143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
// RUN: %clang %s -fsyntax-only -Xclang -verify -fblocks -Wunreachable-code -Wno-unused-value -Wno-covered-switch-default
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int halt() __attribute__((noreturn));
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int live();
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int dead();
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void test1() {
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goto c;
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d:
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goto e; // expected-warning {{will never be executed}}
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c: ;
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int i;
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return;
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goto b; // expected-warning {{will never be executed}}
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goto a; // expected-warning {{will never be executed}}
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b:
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i = 1;
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a:
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i = 2;
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goto f;
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e:
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goto d;
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f: ;
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}
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void test2() {
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int i;
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switch (live()) {
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case 1:
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halt(),
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dead(); // expected-warning {{will never be executed}}
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case 2:
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live(), halt(),
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dead(); // expected-warning {{will never be executed}}
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case 3:
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live()
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+ // expected-warning {{will never be executed}}
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halt();
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dead();
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case 4:
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a4:
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live(),
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halt();
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goto a4; // expected-warning {{will never be executed}}
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case 5:
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goto a5;
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c5:
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dead(); // expected-warning {{will never be executed}}
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goto b5;
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a5:
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live(),
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halt();
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b5:
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goto c5;
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case 6:
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if (live())
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goto e6;
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live(),
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halt();
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d6:
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dead(); // expected-warning {{will never be executed}}
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goto b6;
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c6:
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dead();
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goto b6;
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e6:
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live(),
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halt();
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b6:
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goto c6;
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case 7:
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halt()
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+
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dead(); // expected-warning {{will never be executed}}
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- // expected-warning {{will never be executed}}
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halt();
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case 8:
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i
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+= // expected-warning {{will never be executed}}
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halt();
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case 9:
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halt()
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? // expected-warning {{will never be executed}}
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dead() : dead();
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case 10:
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( // expected-warning {{will never be executed}}
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float)halt();
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case 11: {
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int a[5];
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live(),
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a[halt()
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]; // expected-warning {{will never be executed}}
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}
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}
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}
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enum Cases { C1, C2, C3 };
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int test_enum_cases(enum Cases C) {
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switch (C) {
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case C1:
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case C2:
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case C3:
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return 1;
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default: {
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int i = 0; // expected-warning{{will never be executed}}
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++i;
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return i;
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}
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}
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}
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// Handle unreachable code triggered by macro expansions.
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void __myassert_rtn(const char *, const char *, int, const char *) __attribute__((__noreturn__));
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#define myassert(e) \
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(__builtin_expect(!(e), 0) ? __myassert_rtn(__func__, __FILE__, __LINE__, #e) : (void)0)
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void test_assert() {
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myassert(0 && "unreachable");
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return; // no-warning
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}
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// Test case for PR 9774. Tests that dead code in macros aren't warned about.
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#define MY_MAX(a,b) ((a) >= (b) ? (a) : (b))
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void PR9774(int *s) {
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for (int i = 0; i < MY_MAX(2, 3); i++) // no-warning
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s[i] = 0;
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}
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// Test case for <rdar://problem/11005770>. We should treat code guarded
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// by 'x & 0' and 'x * 0' as unreachable.
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void calledFun();
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void test_mul_and_zero(int x) {
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if (x & 0) calledFun(); // expected-warning {{will never be executed}}
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if (0 & x) calledFun(); // expected-warning {{will never be executed}}
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if (x * 0) calledFun(); // expected-warning {{will never be executed}}
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if (0 * x) calledFun(); // expected-warning {{will never be executed}}
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}
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