xref: /llvm-project/clang-tools-extra/test/clang-tidy/checkers/misc/static-assert.cpp (revision 3af6ae0fbea40097e159c11893ee7ab57d00480c)

// RUN: %check_clang_tidy -std=c++11 -check-suffixes=,CXX11 %s misc-static-assert %t
// RUN: %check_clang_tidy -std=c++17-or-later -check-suffixes=,CXX17 %s misc-static-assert %t

void abort() {}
#ifdef NDEBUG
#define assert(x) 1
#else
#define assert(x)                                                              \
  if (!(x))                                                                    \
  abort()
#endif

void print(...);

#define ZERO_MACRO 0

#define False false
#define FALSE 0

#define my_macro() assert(0 == 1)
// CHECK-FIXES: #define my_macro() assert(0 == 1)

namespace PR24066 {

void referenceMember() {
  struct {
    int A;
    int B;
  } S;
  assert(&S.B - &S.A == 1);
}

const int X = 1;
void referenceVariable() {
  assert(X > 0);
}


constexpr int Y = 1;
void referenceConstexprVariable() {
  assert(Y > 0);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be replaced by static_assert() [misc-static-assert]
  // CHECK-FIXES-CXX11: {{^  }}static_assert(Y > 0, "");
  // CHECK-FIXES-CXX17: {{^  }}static_assert(Y > 0);
}

void useInSizeOf() {
  char a = 0;
  assert(sizeof(a) == 1U);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be replaced by static_assert() [misc-static-assert]
  // CHECK-FIXES-CXX11: {{^  }}static_assert(sizeof(a) == 1U, "");
  // CHECK-FIXES-CXX17: {{^  }}static_assert(sizeof(a) == 1U);
}

void useInDecltype() {
  char a = 0;
  assert(static_cast<decltype(a)>(256) == 0);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be replaced by static_assert() [misc-static-assert]
  // CHECK-FIXES-CXX11: {{^  }}static_assert(static_cast<decltype(a)>(256) == 0, "");
  // CHECK-FIXES-CXX17: {{^  }}static_assert(static_cast<decltype(a)>(256) == 0);
}

}

constexpr bool myfunc(int a, int b) { return a * b == 0; }

typedef __SIZE_TYPE__ size_t;
extern "C" size_t strlen(const char *s);

class A {
public:
  bool method() { return true; }
};

class B {
public:
  constexpr bool method() { return true; }
};

template <class T> void doSomething(T t) {
  assert(myfunc(1, 2));
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be replaced by static_assert() [misc-static-assert]
  // CHECK-FIXES-CXX11: {{^  }}static_assert(myfunc(1, 2), "");
  // CHECK-FIXES-CXX17: {{^  }}static_assert(myfunc(1, 2));

  assert(t.method());
  // CHECK-FIXES: {{^  }}assert(t.method());

  assert(sizeof(T) == 123);
}

int main() {
  my_macro();
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be
  // CHECK-FIXES: {{^  }}my_macro();

  assert(myfunc(1, 2) && (3 == 4));
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be
  // CHECK-FIXES-CXX11: {{^  }}static_assert(myfunc(1, 2) && (3 == 4), "");
  // CHECK-FIXES-CXX17: {{^  }}static_assert(myfunc(1, 2) && (3 == 4));

  int x = 1;
  assert(x == 0);
  // CHECK-FIXES: {{^  }}assert(x == 0);

  A a;
  B b;

  doSomething<A>(a);
  doSomething<B>(b);

  assert(false);
  // CHECK-FIXES: {{^  }}assert(false);

  assert(False);
  // CHECK-FIXES: {{^  }}assert(False);
  assert(FALSE);
  // CHECK-FIXES: {{^  }}assert(FALSE);

  assert(ZERO_MACRO);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be
  // CHECK-FIXES-CXX11: {{^  }}static_assert(ZERO_MACRO, "");
  // CHECK-FIXES-CXX17: {{^  }}static_assert(ZERO_MACRO);

  assert(!"Don't report me!");
  // CHECK-FIXES: {{^  }}assert(!"Don't report me!");

  assert(0 && "Don't report me!");
  // CHECK-FIXES: {{^  }}assert(0 && "Don't report me!");

  assert(false && "Don't report me!");
  // CHECK-FIXES: {{^  }}assert(false && "Don't report me!");

#define NULL ((void*)0)
  assert(NULL && "Don't report me!");
  // CHECK-FIXES: {{^  }}assert(NULL && "Don't report me!");

  assert(NULL == "Don't report me!");
  // CHECK-FIXES: {{^  }}assert(NULL == "Don't report me!");

  assert("Don't report me!" == NULL);
  // CHECK-FIXES: {{^  }}assert("Don't report me!" == NULL);

  assert(0 == "Don't report me!");
  // CHECK-FIXES: {{^  }}assert(0 == "Don't report me!");

#define NULL ((unsigned int)0)
  assert(NULL && "Report me!");
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be
  // CHECK-FIXES: {{^  }}static_assert(NULL , "Report me!");

#define NULL __null
  assert(__null == "Don't report me!");
  // CHECK-FIXES: {{^  }}assert(__null == "Don't report me!");
  assert(NULL == "Don't report me!");
  // CHECK-FIXES: {{^  }}assert(NULL == "Don't report me!");
#undef NULL

  assert(ZERO_MACRO && "Report me!");
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be
  // CHECK-FIXES: {{^  }}static_assert(ZERO_MACRO , "Report me!");

  assert(0);

#define false false
  assert(false);

#define false 0
  assert(false);
#undef false

  assert(10==5 && "Report me!");
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be
  // CHECK-FIXES: {{^  }}static_assert(10==5 , "Report me!");

  assert(strlen("12345") == 5);
  // CHECK-FIXES: {{^  }}assert(strlen("12345") == 5);

#define assert(e) (__builtin_expect(!(e), 0) ? print (#e, __FILE__, __LINE__) : (void)0)
  assert(false);
  // CHECK-FIXES: {{^  }}assert(false);

  assert(10 == 5 + 5);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: found assert() that could be
  // CHECK-FIXES-CXX11: {{^  }}static_assert(10 == 5 + 5, "");
  // CHECK-FIXES-CXX17: {{^  }}static_assert(10 == 5 + 5);
#undef assert

  return 0;
}