forked from OSchip/llvm-project
115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -analyze -analyzer-checker=deadcode.DeadStores -verify -Wno-unreachable-code %s
|
|
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -analyze -analyzer-store=basic -analyzer-constraints=basic -analyzer-checker=deadcode.DeadStores -verify -Wno-unreachable-code %s
|
|
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -analyze -analyzer-store=basic -analyzer-constraints=range -analyzer-checker=deadcode.DeadStores -verify -Wno-unreachable-code %s
|
|
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -analyze -analyzer-store=region -analyzer-constraints=basic -analyzer-checker=deadcode.DeadStores -verify -Wno-unreachable-code %s
|
|
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -analyze -analyzer-store=region -analyzer-constraints=range -analyzer-checker=deadcode.DeadStores -verify -Wno-unreachable-code %s
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Basic dead store checking (but in C++ mode).
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
int j;
|
|
void test1() {
|
|
int x = 4;
|
|
|
|
x = x + 1; // expected-warning{{never read}}
|
|
|
|
switch (j) {
|
|
case 1:
|
|
throw 1;
|
|
(void)x;
|
|
break;
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Dead store checking involving constructors.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
class Test2 {
|
|
int &x;
|
|
public:
|
|
Test2(int &y) : x(y) {}
|
|
~Test2() { ++x; }
|
|
};
|
|
|
|
int test2(int x) {
|
|
{ Test2 a(x); } // no-warning
|
|
return x;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Dead store checking involving CXXTemporaryExprs
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
namespace TestTemp {
|
|
template<typename _Tp>
|
|
class pencil {
|
|
public:
|
|
~pencil() throw() {}
|
|
};
|
|
template<typename _Tp, typename _Number2> struct _Row_base {
|
|
_Row_base(const pencil<_Tp>& x) {}
|
|
};
|
|
template<typename _Tp, typename _Number2 = TestTemp::pencil<_Tp> >
|
|
class row : protected _Row_base<_Tp, _Number2> {
|
|
typedef _Row_base<_Tp, _Number2> _Base;
|
|
typedef _Number2 pencil_type;
|
|
public:
|
|
explicit row(const pencil_type& __a = pencil_type()) : _Base(__a) {}
|
|
};
|
|
}
|
|
|
|
void test2_b() {
|
|
TestTemp::row<const char*> x; // no-warning
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Test references.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void test3_a(int x) {
|
|
x = x + 1; // expected-warning{{never read}}
|
|
}
|
|
|
|
void test3_b(int &x) {
|
|
x = x + 1; // no-warninge
|
|
}
|
|
|
|
void test3_c(int x) {
|
|
int &y = x;
|
|
// Shows the limitation of dead stores tracking. The write is really
|
|
// dead since the value cannot escape the function.
|
|
++y; // no-warning
|
|
}
|
|
|
|
void test3_d(int &x) {
|
|
int &y = x;
|
|
++y; // no-warning
|
|
}
|
|
|
|
void test3_e(int &x) {
|
|
int &y = x;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Dead stores involving 'new'
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static void test_new(unsigned n) {
|
|
char **p = new char* [n]; // expected-warning{{never read}}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Dead stores in namespaces.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
namespace foo {
|
|
int test_4(int x) {
|
|
x = 2; // expected-warning{{Value stored to 'x' is never read}}
|
|
x = 2;
|
|
return x;
|
|
}
|
|
}
|
|
|