test/SemaCXX/warn-thread-safety-negative.cpp

// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wthread-safety -Wthread-safety-beta -Wthread-safety-negative -fcxx-exceptions %s

// FIXME: should also run  %clang_cc1 -fsyntax-only -verify -Wthread-safety -std=c++11 -Wc++98-compat %s
// FIXME: should also run  %clang_cc1 -fsyntax-only -verify -Wthread-safety %s

#define LOCKABLE            __attribute__ ((lockable))
#define SCOPED_LOCKABLE     __attribute__ ((scoped_lockable))
#define GUARDED_BY(x)       __attribute__ ((guarded_by(x)))
#define GUARDED_VAR         __attribute__ ((guarded_var))
#define PT_GUARDED_BY(x)    __attribute__ ((pt_guarded_by(x)))
#define PT_GUARDED_VAR      __attribute__ ((pt_guarded_var))
#define ACQUIRED_AFTER(...) __attribute__ ((acquired_after(__VA_ARGS__)))
#define ACQUIRED_BEFORE(...) __attribute__ ((acquired_before(__VA_ARGS__)))
#define EXCLUSIVE_LOCK_FUNCTION(...)    __attribute__ ((exclusive_lock_function(__VA_ARGS__)))
#define SHARED_LOCK_FUNCTION(...)       __attribute__ ((shared_lock_function(__VA_ARGS__)))
#define ASSERT_EXCLUSIVE_LOCK(...)      __attribute__ ((assert_exclusive_lock(__VA_ARGS__)))
#define ASSERT_SHARED_LOCK(...)         __attribute__ ((assert_shared_lock(__VA_ARGS__)))
#define EXCLUSIVE_TRYLOCK_FUNCTION(...) __attribute__ ((exclusive_trylock_function(__VA_ARGS__)))
#define SHARED_TRYLOCK_FUNCTION(...)    __attribute__ ((shared_trylock_function(__VA_ARGS__)))
#define UNLOCK_FUNCTION(...)            __attribute__ ((unlock_function(__VA_ARGS__)))
#define LOCK_RETURNED(x)    __attribute__ ((lock_returned(x)))
#define LOCKS_EXCLUDED(...) __attribute__ ((locks_excluded(__VA_ARGS__)))
#define EXCLUSIVE_LOCKS_REQUIRED(...) \
  __attribute__ ((exclusive_locks_required(__VA_ARGS__)))
#define SHARED_LOCKS_REQUIRED(...) \
  __attribute__ ((shared_locks_required(__VA_ARGS__)))
#define NO_THREAD_SAFETY_ANALYSIS  __attribute__ ((no_thread_safety_analysis))


class  __attribute__((lockable)) Mutex {
 public:
  void Lock() __attribute__((exclusive_lock_function));
  void ReaderLock() __attribute__((shared_lock_function));
  void Unlock() __attribute__((unlock_function));
  bool TryLock() __attribute__((exclusive_trylock_function(true)));
  bool ReaderTryLock() __attribute__((shared_trylock_function(true)));
  void LockWhen(const int &cond) __attribute__((exclusive_lock_function));

  // for negative capabilities
  const Mutex& operator!() const { return *this; }

  void AssertHeld()       ASSERT_EXCLUSIVE_LOCK();
  void AssertReaderHeld() ASSERT_SHARED_LOCK();
};


namespace SimpleTest {

class Bar {
  Mutex mu;
  int a GUARDED_BY(mu);

public:
  void baz() EXCLUSIVE_LOCKS_REQUIRED(!mu) {
    mu.Lock();
    a = 0;
    mu.Unlock();
  }
};


class Foo {
  Mutex mu;
  int a GUARDED_BY(mu);

public:
  void foo() {
    mu.Lock();    // expected-warning {{acquiring mutex 'mu' requires negative capability '!mu'}}
    baz();        // expected-warning {{cannot call function 'baz' while mutex 'mu' is held}}
    bar();
    mu.Unlock();
  }

  void bar() {
    baz();        // expected-warning {{calling function 'baz' requires holding  '!mu'}}
  }

  void baz() EXCLUSIVE_LOCKS_REQUIRED(!mu) {
    mu.Lock();
    a = 0;
    mu.Unlock();
  }

  void test() {
    Bar b;
    b.baz();     // no warning -- in different class.
  }

  void test2() {
    mu.Lock();   // expected-warning {{acquiring mutex 'mu' requires negative capability '!mu'}}
    a = 0;
    mu.Unlock();
    baz();       // no warning -- !mu in set.
  }

  void test3() EXCLUSIVE_LOCKS_REQUIRED(!mu) {
    mu.Lock();
    a = 0;
    mu.Unlock();
    baz();       // no warning -- !mu in set.
  }
};

}  // end namespace SimpleTest