text: // RUN: %clang_cc1 -fsyntax-only -verify -Wthread-safety -Wthread-safety-beta %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))
  
  // Define the mutex struct.
  // Simplified only for test purpose.
  struct LOCKABLE Mutex {};
  
  struct Foo {
    struct Mutex *mu_;
  };
  
  // Declare mutex lock/unlock functions.
  void mutex_exclusive_lock(struct Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu);
  void mutex_shared_lock(struct Mutex *mu) SHARED_LOCK_FUNCTION(mu);
  void mutex_unlock(struct Mutex *mu) UNLOCK_FUNCTION(mu);
  void mutex_shared_unlock(struct Mutex *mu) __attribute__((release_shared_capability(mu)));
  void mutex_exclusive_unlock(struct Mutex *mu) __attribute__((release_capability(mu)));
  
  // Define global variables.
  struct Mutex mu1;
  struct Mutex mu2 ACQUIRED_AFTER(mu1);
  struct Foo foo_ = {&mu1};
  int a_ GUARDED_BY(foo_.mu_);
  int *b_ PT_GUARDED_BY(foo_.mu_) = &a_;
  int c_ GUARDED_VAR;
  int *d_ PT_GUARDED_VAR = &c_;
  
  // Define test functions.
  int Foo_fun1(int i) SHARED_LOCKS_REQUIRED(mu2) EXCLUSIVE_LOCKS_REQUIRED(mu1) {
    return i;
  }
  
  int Foo_fun2(int i) EXCLUSIVE_LOCKS_REQUIRED(mu2) SHARED_LOCKS_REQUIRED(mu1) {
    return i;
  }
  
  int Foo_func3(int i) LOCKS_EXCLUDED(mu1, mu2) {
    return i;
  }
  
  static int Bar_fun1(int i) EXCLUSIVE_LOCKS_REQUIRED(mu1) {
    return i;
  }
  
  void set_value(int *a, int value) EXCLUSIVE_LOCKS_REQUIRED(foo_.mu_) {
    *a = value;
  }
  
  int get_value(int *p) SHARED_LOCKS_REQUIRED(foo_.mu_){
    return *p;
  }
  
  int main(void) {
  
    Foo_fun1(1); // expected-warning{{calling function 'Foo_fun1' requires holding mutex 'mu2'}} \
                    expected-warning{{calling function 'Foo_fun1' requires holding mutex 'mu1' exclusively}}
  
    mutex_exclusive_lock(&mu1); // expected-note{{mutex acquired here}}
    mutex_shared_lock(&mu2);
    Foo_fun1(1);
  
    mutex_shared_lock(&mu1); // expected-warning{{acquiring mutex 'mu1' that is already held}} \
                                expected-warning{{mutex 'mu1' must be acquired before 'mu2'}}
    mutex_unlock(&mu1);
    mutex_unlock(&mu2);
    mutex_shared_lock(&mu1);
    mutex_exclusive_lock(&mu2);
    Foo_fun2(2);
  
    mutex_unlock(&mu2);
    mutex_unlock(&mu1);
    mutex_exclusive_lock(&mu1);
    Bar_fun1(3);
    mutex_unlock(&mu1);
  
    mutex_exclusive_lock(&mu1);
    Foo_func3(4);  // expected-warning{{cannot call function 'Foo_func3' while mutex 'mu1' is held}}
    mutex_unlock(&mu1);
  
    Foo_func3(5);
  
    set_value(&a_, 0); // expected-warning{{calling function 'set_value' requires holding mutex 'foo_.mu_' exclusively}}
    get_value(b_); // expected-warning{{calling function 'get_value' requires holding mutex 'foo_.mu_'}}
    mutex_exclusive_lock(foo_.mu_);
    set_value(&a_, 1);
    mutex_unlock(foo_.mu_);
    mutex_shared_lock(foo_.mu_);
    (void)(get_value(b_) == 1);
    mutex_unlock(foo_.mu_);
  
    c_ = 0; // expected-warning{{writing variable 'c_' requires holding any mutex exclusively}}
    (void)(*d_ == 0); // expected-warning{{reading the value pointed to by 'd_' requires holding any mutex}}
    mutex_exclusive_lock(foo_.mu_);
    c_ = 1;
    (void)(*d_ == 1);
    mutex_unlock(foo_.mu_);
  
    mutex_exclusive_lock(&mu1);    // expected-note {{mutex acquired here}}
    mutex_shared_unlock(&mu1);     // expected-warning {{releasing mutex 'mu1' using shared access, expected exclusive access}}
                                   // expected-note@-1{{mutex released here}}
    mutex_exclusive_unlock(&mu1);  // expected-warning {{releasing mutex 'mu1' that was not held}}
  
    mutex_shared_lock(&mu1);      // expected-note {{mutex acquired here}}
    mutex_exclusive_unlock(&mu1); // expected-warning {{releasing mutex 'mu1' using exclusive access, expected shared access}}
                                  // expected-note@-1{{mutex released here}}
    mutex_shared_unlock(&mu1);    // expected-warning {{releasing mutex 'mu1' that was not held}}
  
    return 0;
  }
  
  // We had a problem where we'd skip all attributes that follow a late-parsed
  // attribute in a single __attribute__.
  void run(void) __attribute__((guarded_by(mu1), guarded_by(mu1))); // expected-warning 2{{only applies to non-static data members and global variables}}
  