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// RUN: %clang_cc1 %s -fcxx-exceptions -fexceptions -fsyntax-only -verify -fblocks -Wunreachable-code-aggressive -Wno-unused-value
int &halt() __attribute__((noreturn));
int &live();
int dead();
int liveti() throw(int);
int (*livetip)() throw(int);
int test1() {
try {
live();
} catch (int i) {
live();
}
return 1;
}
void test2() {
try {
live();
} catch (int i) {
live();
}
try {
liveti();
} catch (int i) {
live();
}
try {
livetip();
} catch (int i) {
live();
}
throw 1;
dead(); // expected-warning {{will never be executed}}
}
void test3() {
halt()
--; // expected-warning {{will never be executed}}
// FIXME: The unreachable part is just the '?', but really all of this
// code is unreachable and shouldn't be separately reported.
halt() // expected-warning {{will never be executed}}
?
dead() : dead();
live(),
float
(halt()); // expected-warning {{will never be executed}}
}
void test4() {
struct S {
int mem;
} s;
S &foor();
halt(), foor()// expected-warning {{will never be executed}}
.mem;
}
void test5() {
struct S {
int mem;
} s;
S &foonr() __attribute__((noreturn));
foonr()
.mem; // expected-warning {{will never be executed}}
}
void test6() {
struct S {
~S() { }
S(int i) { }
};
live(),
S
(halt()); // expected-warning {{will never be executed}}
}
// Don't warn about unreachable code in template instantiations, as
// they may only be unreachable in that specific instantiation.
void isUnreachable();
template <typename T> void test_unreachable_templates() {
T::foo();
isUnreachable(); // no-warning
}
struct TestUnreachableA {
static void foo() __attribute__((noreturn));
};
struct TestUnreachableB {
static void foo();
};
void test_unreachable_templates_harness() {
test_unreachable_templates<TestUnreachableA>();
test_unreachable_templates<TestUnreachableB>();
}
// Do warn about explict template specializations, as they represent
// actual concrete functions that somebody wrote.
template <typename T> void funcToSpecialize() {}
template <> void funcToSpecialize<int>() {
halt();
dead(); // expected-warning {{will never be executed}}
}
// Handle 'try' code dominating a dead return.
enum PR19040_test_return_t
{ PR19040_TEST_FAILURE };
namespace PR19040_libtest
{
class A {
public:
~A ();
};
}
PR19040_test_return_t PR19040_fn1 ()
{
try
{
throw PR19040_libtest::A ();
} catch (...)
{
return PR19040_TEST_FAILURE;
}
return PR19040_TEST_FAILURE; // expected-warning {{will never be executed}}
}
__attribute__((noreturn))
void raze();
namespace std {
template<typename T> struct basic_string {
basic_string(const T* x) {}
~basic_string() {};
};
typedef basic_string<char> string;
}
std::string testStr() {
raze();
return ""; // no-warning
}
std::string testStrWarn(const char *s) {
raze();
return s; // expected-warning {{will never be executed}}
}
bool testBool() {
raze();
return true; // no-warning
}
static const bool ConditionVar = 1;
int test_global_as_conditionVariable() {
if (ConditionVar)
return 1;
return 0; // no-warning
}
// Handle unreachable temporary destructors.
class A {
public:
A();
~A();
};
__attribute__((noreturn))
void raze(const A& x);
void test_with_unreachable_tmp_dtors(int x) {
raze(x ? A() : A()); // no-warning
}
// Test sizeof - sizeof in enum declaration.
enum { BrownCow = sizeof(long) - sizeof(char) };
enum { CowBrown = 8 - 1 };
int test_enum_sizeof_arithmetic() {
if (BrownCow)
return 1;
return 2;
}
int test_enum_arithmetic() {
if (CowBrown)
return 1;
return 2; // expected-warning {{never be executed}}
}
int test_arithmetic() {
if (8 -1)
return 1;
return 2; // expected-warning {{never be executed}}
}
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