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

// 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 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))

//-----------------------------------------//
//  Helper fields
//-----------------------------------------//


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));
};

class __attribute__((scoped_lockable)) MutexLock {
 public:
  MutexLock(Mutex *mu) __attribute__((exclusive_lock_function(mu)));
  ~MutexLock() __attribute__((unlock_function));
};

class __attribute__((scoped_lockable)) ReaderMutexLock {
 public:
  ReaderMutexLock(Mutex *mu) __attribute__((exclusive_lock_function(mu)));
  ~ReaderMutexLock() __attribute__((unlock_function));
};


Mutex sls_mu;

Mutex sls_mu2 __attribute__((acquired_after(sls_mu)));
int sls_guard_var __attribute__((guarded_var)) = 0;
int sls_guardby_var __attribute__((guarded_by(sls_mu))) = 0;

bool getBool();

class MutexWrapper {
public:
   Mutex mu;
   int x __attribute__((guarded_by(mu)));
   void MyLock() __attribute__((exclusive_lock_function(mu))); 
};

MutexWrapper sls_mw;

void sls_fun_0() {
  sls_mw.mu.Lock();
  sls_mw.x = 5; 
  sls_mw.mu.Unlock();
}

void sls_fun_2() {
  sls_mu.Lock();
  int x = sls_guard_var;
  sls_mu.Unlock();
}

void sls_fun_3() {
  sls_mu.Lock();
  sls_guard_var = 2;
  sls_mu.Unlock();
}

void sls_fun_4() {
  sls_mu2.Lock();
  sls_guard_var = 2;
  sls_mu2.Unlock();
}

void sls_fun_5() {
  sls_mu.Lock();
  int x = sls_guardby_var;
  sls_mu.Unlock();
}

void sls_fun_6() {
  sls_mu.Lock();
  sls_guardby_var = 2;
  sls_mu.Unlock();
}

void sls_fun_7() {
  sls_mu.Lock();
  sls_mu2.Lock();
  sls_mu2.Unlock();
  sls_mu.Unlock();
}

void sls_fun_8() {
  sls_mu.Lock();
  if (getBool())
    sls_mu.Unlock();
  else
    sls_mu.Unlock();
}

void sls_fun_9() {
  if (getBool())
    sls_mu.Lock();
  else
    sls_mu.Lock();
  sls_mu.Unlock();
}

void sls_fun_good_6() {
  if (getBool()) {
    sls_mu.Lock();
  } else {
    if (getBool()) {
      getBool(); // EMPTY
    } else {
      getBool(); // EMPTY
    }
    sls_mu.Lock();
  }
  sls_mu.Unlock();
}

void sls_fun_good_7() {
  sls_mu.Lock();
  while (getBool()) {
    sls_mu.Unlock();
    if (getBool()) {
      if (getBool()) {
        sls_mu.Lock();
        continue;
      }
    }
    sls_mu.Lock();
  }
  sls_mu.Unlock();
}

void sls_fun_good_8() {
  sls_mw.MyLock();
  sls_mw.mu.Unlock();
}

void sls_fun_bad_1() {
  sls_mu.Unlock(); // \
    // expected-warning{{unlocking 'sls_mu' that was not locked}}
}

void sls_fun_bad_2() {
  sls_mu.Lock();
  sls_mu.Lock(); // \
    // expected-warning{{locking 'sls_mu' that is already locked}}
  sls_mu.Unlock();
}

void sls_fun_bad_3() {
  sls_mu.Lock(); // \
    // expected-warning{{mutex 'sls_mu' is still locked at the end of function}}
}

void sls_fun_bad_4() {
  if (getBool())
    sls_mu.Lock(); // \
      // expected-warning{{mutex 'sls_mu' is still locked at the end of its scope}}
  else
    sls_mu2.Lock(); // \
      // expected-warning{{mutex 'sls_mu2' is still locked at the end of its scope}}
}

void sls_fun_bad_5() {
  sls_mu.Lock(); // \
    // expected-warning{{mutex 'sls_mu' is still locked at the end of its scope}}
  if (getBool())
    sls_mu.Unlock();
}

void sls_fun_bad_6() {
  if (getBool()) {
    sls_mu.Lock(); // \
      // expected-warning{{mutex 'sls_mu' is still locked at the end of its scope}}
  } else {
    if (getBool()) {
      getBool(); // EMPTY
    } else {
      getBool(); // EMPTY
    }
  }
  sls_mu.Unlock(); // \
    // expected-warning{{unlocking 'sls_mu' that was not locked}}
}

void sls_fun_bad_7() {
  sls_mu.Lock(); // \
    // expected-warning{{expecting mutex 'sls_mu' to be locked at start of each loop}}
  while (getBool()) {
    sls_mu.Unlock();
    if (getBool()) {
      if (getBool()) {
        continue;
      }
    }
    sls_mu.Lock(); // \
      // expected-warning{{mutex 'sls_mu' is still locked at the end of its scope}}
  }
  sls_mu.Unlock();
}

void sls_fun_bad_8() {
  sls_mu.Lock(); // \
    // expected-warning{{expecting mutex 'sls_mu' to be locked at start of each loop}}
  do {
    sls_mu.Unlock();
  } while (getBool());
}

void sls_fun_bad_9() {
  do {
    sls_mu.Lock(); // \
      // expected-warning{{expecting mutex 'sls_mu' to be locked at start of each loop}}
  } while (getBool());
  sls_mu.Unlock();
}

void sls_fun_bad_10() {
  sls_mu.Lock(); // \
    // expected-warning{{mutex 'sls_mu' is still locked at the end of function}} \
    // expected-warning{{expecting mutex 'sls_mu' to be locked at start of each loop}}
  while(getBool()) {
    sls_mu.Unlock();
  }
}

void sls_fun_bad_11() {
  while (getBool()) {
    sls_mu.Lock(); // \
      // expected-warning{{expecting mutex 'sls_mu' to be locked at start of each loop}}
  }
  sls_mu.Unlock(); // \
    // expected-warning{{unlocking 'sls_mu' that was not locked}}
}

//-----------------------------------------//
// Handling lock expressions in attribute args
// -------------------------------------------//

Mutex aa_mu;

class GlobalLocker {
public:
  void globalLock() __attribute__((exclusive_lock_function(aa_mu)));
  void globalUnlock() __attribute__((unlock_function(aa_mu)));
};

GlobalLocker glock;

void aa_fun_1() {
  glock.globalLock();
  glock.globalUnlock();
}

void aa_fun_bad_1() {
  glock.globalUnlock(); // \
    // expected-warning{{unlocking 'aa_mu' that was not locked}}
}

void aa_fun_bad_2() {
  glock.globalLock();
  glock.globalLock(); // \
    // expected-warning{{locking 'aa_mu' that is already locked}}
  glock.globalUnlock();
}

void aa_fun_bad_3() {
  glock.globalLock(); // \
    // expected-warning{{mutex 'aa_mu' is still locked at the end of function}}
}

//--------------------------------------------------//
// Regression tests for unusual method names
//--------------------------------------------------//

Mutex wmu;

// Test diagnostics for other method names.
class WeirdMethods {
  WeirdMethods() {
    wmu.Lock(); // \
      // expected-warning {{mutex 'wmu' is still locked at the end of function}}
  }
  ~WeirdMethods() {
    wmu.Lock(); // \
      // expected-warning {{mutex 'wmu' is still locked at the end of function}}
  }
  void operator++() {
    wmu.Lock(); // \
      // expected-warning {{mutex 'wmu' is still locked at the end of function}}
  }
  operator int*() {
    wmu.Lock(); // \
      // expected-warning {{mutex 'wmu' is still locked at the end of function}}
    return 0;
  }
};

//-----------------------------------------------//
// Errors for guarded by or guarded var variables
// ----------------------------------------------//

int *pgb_gvar __attribute__((pt_guarded_var));
int *pgb_var __attribute__((pt_guarded_by(sls_mu)));

class PGBFoo {
 public:
  int x;
  int *pgb_field __attribute__((guarded_by(sls_mu2)))
                 __attribute__((pt_guarded_by(sls_mu)));
  void testFoo() {
    pgb_field = &x; // \
      // expected-warning {{writing variable 'pgb_field' requires locking 'sls_mu2' exclusively}}
    *pgb_field = x; // expected-warning {{reading variable 'pgb_field' requires locking 'sls_mu2'}} \
      // expected-warning {{writing the value pointed to by 'pgb_field' requires locking 'sls_mu' exclusively}}
    x = *pgb_field; // expected-warning {{reading variable 'pgb_field' requires locking 'sls_mu2'}} \
      // expected-warning {{reading the value pointed to by 'pgb_field' requires locking 'sls_mu'}}
    (*pgb_field)++; // expected-warning {{reading variable 'pgb_field' requires locking 'sls_mu2'}} \
      // expected-warning {{writing the value pointed to by 'pgb_field' requires locking 'sls_mu' exclusively}}
  }
};

class GBFoo {
 public:
  int gb_field __attribute__((guarded_by(sls_mu)));

  void testFoo() {
    gb_field = 0; // \
      // expected-warning {{writing variable 'gb_field' requires locking 'sls_mu' exclusively}}
  }

  void testNoAnal() __attribute__((no_thread_safety_analysis)) {
    gb_field = 0;
  }
};

GBFoo GlobalGBFoo __attribute__((guarded_by(sls_mu)));

void gb_fun_0() {
  sls_mu.Lock();
  int x = *pgb_var;
  sls_mu.Unlock();
}

void gb_fun_1() {
  sls_mu.Lock();
  *pgb_var = 2;
  sls_mu.Unlock();
}

void gb_fun_2() {
  int x;
  pgb_var = &x;
}

void gb_fun_3() {
  int *x = pgb_var;
}

void gb_bad_0() {
  sls_guard_var = 1; // \
    // expected-warning{{writing variable 'sls_guard_var' requires locking any mutex exclusively}}
}

void gb_bad_1() {
  int x = sls_guard_var; // \
    // expected-warning{{reading variable 'sls_guard_var' requires locking any mutex}}
}

void gb_bad_2() {
  sls_guardby_var = 1; // \
    // expected-warning {{writing variable 'sls_guardby_var' requires locking 'sls_mu' exclusively}}
}

void gb_bad_3() {
  int x = sls_guardby_var; // \
    // expected-warning {{reading variable 'sls_guardby_var' requires locking 'sls_mu'}}
}

void gb_bad_4() {
  *pgb_gvar = 1; // \
    // expected-warning {{writing the value pointed to by 'pgb_gvar' requires locking any mutex exclusively}}
}

void gb_bad_5() {
  int x = *pgb_gvar; // \
    // expected-warning {{reading the value pointed to by 'pgb_gvar' requires locking any mutex}}
}

void gb_bad_6() {
  *pgb_var = 1; // \
    // expected-warning {{writing the value pointed to by 'pgb_var' requires locking 'sls_mu' exclusively}}
}

void gb_bad_7() {
  int x = *pgb_var; // \
    // expected-warning {{reading the value pointed to by 'pgb_var' requires locking 'sls_mu'}}
}

void gb_bad_8() {
  GBFoo G;
  G.gb_field = 0; // \
    // expected-warning {{writing variable 'gb_field' requires locking 'sls_mu'}}
}

void gb_bad_9() {
  sls_guard_var++; // \
    // expected-warning{{writing variable 'sls_guard_var' requires locking any mutex exclusively}}
  sls_guard_var--; // \
    // expected-warning{{writing variable 'sls_guard_var' requires locking any mutex exclusively}}
  ++sls_guard_var; // \
    // expected-warning{{writing variable 'sls_guard_var' requires locking any mutex exclusively}}
  --sls_guard_var;// \
    // expected-warning{{writing variable 'sls_guard_var' requires locking any mutex exclusively}}
}

//-----------------------------------------------//
// Warnings on variables with late parsed attributes
// ----------------------------------------------//

class LateFoo {
public:
  int a __attribute__((guarded_by(mu)));
  int b;

  void foo() __attribute__((exclusive_locks_required(mu))) { }

  void test() {
    a = 0; // \
      // expected-warning{{writing variable 'a' requires locking 'mu' exclusively}}
    b = a; // \
      // expected-warning {{reading variable 'a' requires locking 'mu'}}
    c = 0; // \
      // expected-warning {{writing variable 'c' requires locking 'mu' exclusively}}
  }

  int c __attribute__((guarded_by(mu)));

  Mutex mu;
};

class LateBar {
 public:
  int a_ __attribute__((guarded_by(mu1_)));
  int b_;
  int *q __attribute__((pt_guarded_by(mu)));
  Mutex mu1_;
  Mutex mu;
  LateFoo Foo;
  LateFoo Foo2;
  LateFoo *FooPointer;
};

LateBar b1, *b3;

void late_0() {
  LateFoo FooA;
  LateFoo FooB;
  FooA.mu.Lock();
  FooA.a = 5;
  FooA.mu.Unlock();
}

void late_1() {
  LateBar BarA;
  BarA.FooPointer->mu.Lock();
  BarA.FooPointer->a = 2;
  BarA.FooPointer->mu.Unlock();
}

void late_bad_0() {
  LateFoo fooA;
  LateFoo fooB;
  fooA.mu.Lock();
  fooB.a = 5; // \
    // expected-warning{{writing variable 'a' requires locking 'mu' exclusively}}
  fooA.mu.Unlock();
}

void late_bad_1() {
  Mutex mu;
  mu.Lock();
  b1.mu1_.Lock();
  int res = b1.a_ + b3->b_;
  b3->b_ = *b1.q; // \
    // expected-warning{{reading the value pointed to by 'q' requires locking 'mu'}}
  b1.mu1_.Unlock();
  b1.b_ = res;
  mu.Unlock();
}

void late_bad_2() {
  LateBar BarA;
  BarA.FooPointer->mu.Lock();
  BarA.Foo.a = 2; // \
    // expected-warning{{writing variable 'a' requires locking 'mu' exclusively}}
  BarA.FooPointer->mu.Unlock();
}

void late_bad_3() {
  LateBar BarA;
  BarA.Foo.mu.Lock();
  BarA.FooPointer->a = 2; // \
    // expected-warning{{writing variable 'a' requires locking 'mu' exclusively}}
  BarA.Foo.mu.Unlock();
}

void late_bad_4() {
  LateBar BarA;
  BarA.Foo.mu.Lock();
  BarA.Foo2.a = 2; // \
    // expected-warning{{writing variable 'a' requires locking 'mu' exclusively}}
  BarA.Foo.mu.Unlock();
}

//-----------------------------------------------//
// Extra warnings for shared vs. exclusive locks
// ----------------------------------------------//

void shared_fun_0() {
  sls_mu.Lock();
  do {
    sls_mu.Unlock();
    sls_mu.Lock();
  } while (getBool());
  sls_mu.Unlock();
}

void shared_fun_1() {
  sls_mu.ReaderLock(); // \
    // expected-warning {{mutex 'sls_mu' is locked exclusively and shared in the same scope}}
  do {
    sls_mu.Unlock();
    sls_mu.Lock();  // \
      // expected-note {{the other lock of mutex 'sls_mu' is here}}
  } while (getBool());
  sls_mu.Unlock();
}

void shared_fun_3() {
  if (getBool())
    sls_mu.Lock();
  else
    sls_mu.Lock();
  *pgb_var = 1;
  sls_mu.Unlock();
}

void shared_fun_4() {
  if (getBool())
    sls_mu.ReaderLock();
  else
    sls_mu.ReaderLock();
  int x = sls_guardby_var;
  sls_mu.Unlock();
}

void shared_fun_8() {
  if (getBool())
    sls_mu.Lock(); // \
      // expected-warning {{mutex 'sls_mu' is locked exclusively and shared in the same scope}}
  else
    sls_mu.ReaderLock(); // \
      // expected-note {{the other lock of mutex 'sls_mu' is here}}
  sls_mu.Unlock();
}

void shared_bad_0() {
  sls_mu.Lock();  // \
    // expected-warning {{mutex 'sls_mu' is locked exclusively and shared in the same scope}}
  do {
    sls_mu.Unlock();
    sls_mu.ReaderLock();  // \
      // expected-note {{the other lock of mutex 'sls_mu' is here}}
  } while (getBool());
  sls_mu.Unlock();
}

void shared_bad_1() {
  if (getBool())
    sls_mu.Lock(); // \
      // expected-warning {{mutex 'sls_mu' is locked exclusively and shared in the same scope}}
  else
    sls_mu.ReaderLock(); // \
      // expected-note {{the other lock of mutex 'sls_mu' is here}}
  *pgb_var = 1;
  sls_mu.Unlock();
}

void shared_bad_2() {
  if (getBool())
    sls_mu.ReaderLock(); // \
      // expected-warning {{mutex 'sls_mu' is locked exclusively and shared in the same scope}}
  else
    sls_mu.Lock(); // \
      // expected-note {{the other lock of mutex 'sls_mu' is here}}
  *pgb_var = 1;
  sls_mu.Unlock();
}

// FIXME: Add support for functions (not only methods)
class LRBar {
 public:
  void aa_elr_fun() __attribute__((exclusive_locks_required(aa_mu)));
  void aa_elr_fun_s() __attribute__((shared_locks_required(aa_mu)));
  void le_fun() __attribute__((locks_excluded(sls_mu)));
};

class LRFoo {
 public:
  void test() __attribute__((exclusive_locks_required(sls_mu)));
  void testShared() __attribute__((shared_locks_required(sls_mu2)));
};

void elr_fun() __attribute__((exclusive_locks_required(sls_mu)));
void elr_fun() {}

LRFoo MyLRFoo;
LRBar Bar;

void es_fun_0() {
  aa_mu.Lock();
  Bar.aa_elr_fun();
  aa_mu.Unlock();
}

void es_fun_1() {
  aa_mu.Lock();
  Bar.aa_elr_fun_s();
  aa_mu.Unlock();
}

void es_fun_2() {
  aa_mu.ReaderLock();
  Bar.aa_elr_fun_s();
  aa_mu.Unlock();
}

void es_fun_3() {
  sls_mu.Lock();
  MyLRFoo.test();
  sls_mu.Unlock();
}

void es_fun_4() {
  sls_mu2.Lock();
  MyLRFoo.testShared();
  sls_mu2.Unlock();
}

void es_fun_5() {
  sls_mu2.ReaderLock();
  MyLRFoo.testShared();
  sls_mu2.Unlock();
}

void es_fun_6() {
  Bar.le_fun();
}

void es_fun_7() {
  sls_mu.Lock();
  elr_fun();
  sls_mu.Unlock();
}

void es_fun_8() __attribute__((no_thread_safety_analysis));

void es_fun_8() {
  Bar.aa_elr_fun_s();
}

void es_fun_9() __attribute__((shared_locks_required(aa_mu)));
void es_fun_9() {
  Bar.aa_elr_fun_s();
}

void es_fun_10() __attribute__((exclusive_locks_required(aa_mu)));
void es_fun_10() {
  Bar.aa_elr_fun_s();
}

void es_bad_0() {
  Bar.aa_elr_fun(); // \
    // expected-warning {{calling function 'aa_elr_fun' requires exclusive lock on 'aa_mu'}}
}

void es_bad_1() {
  aa_mu.ReaderLock();
  Bar.aa_elr_fun(); // \
    // expected-warning {{calling function 'aa_elr_fun' requires exclusive lock on 'aa_mu'}}
  aa_mu.Unlock();
}

void es_bad_2() {
  Bar.aa_elr_fun_s(); // \
    // expected-warning {{calling function 'aa_elr_fun_s' requires shared lock on 'aa_mu'}}
}

void es_bad_3() {
  MyLRFoo.test(); // \
    // expected-warning {{calling function 'test' requires exclusive lock on 'sls_mu'}}
}

void es_bad_4() {
  MyLRFoo.testShared(); // \
    // expected-warning {{calling function 'testShared' requires shared lock on 'sls_mu2'}}
}

void es_bad_5() {
  sls_mu.ReaderLock();
  MyLRFoo.test(); // \
    // expected-warning {{calling function 'test' requires exclusive lock on 'sls_mu'}}
  sls_mu.Unlock();
}

void es_bad_6() {
  sls_mu.Lock();
  Bar.le_fun(); // \
    // expected-warning {{cannot call function 'le_fun' while mutex 'sls_mu' is locked}}
  sls_mu.Unlock();
}

void es_bad_7() {
  sls_mu.ReaderLock();
  Bar.le_fun(); // \
    // expected-warning {{cannot call function 'le_fun' while mutex 'sls_mu' is locked}}
  sls_mu.Unlock();
}


//-----------------------------------------------//
// Unparseable lock expressions
// ----------------------------------------------//

Mutex UPmu;
// FIXME: add support for lock expressions involving arrays.
Mutex mua[5];

int x __attribute__((guarded_by(UPmu = sls_mu)));
int y __attribute__((guarded_by(mua[0])));


void testUnparse() {
  x = 5; // \
    // expected-warning{{cannot resolve lock expression}}
  y = 5; // \
    // expected-warning{{cannot resolve lock expression}}
}

void testUnparse2() {
  mua[0].Lock(); // \
    // expected-warning{{cannot resolve lock expression}}
  (&(mua[0]) + 4)->Lock(); // \
    // expected-warning{{cannot resolve lock expression}}
}


//----------------------------------------------------------------------------//
// The following test cases are ported from the gcc thread safety implementation
// They are each wrapped inside a namespace with the test number of the gcc test
//
// FIXME: add all the gcc tests, once this analysis passes them.
//----------------------------------------------------------------------------//

//-----------------------------------------//
// Good testcases (no errors)
//-----------------------------------------//

namespace thread_annot_lock_20 {
class Bar {
 public:
  static int func1() EXCLUSIVE_LOCKS_REQUIRED(mu1_);
  static int b_ GUARDED_BY(mu1_);
  static Mutex mu1_;
  static int a_ GUARDED_BY(mu1_);
};

Bar b1;

int Bar::func1()
{
  int res = 5;

  if (a_ == 4)
    res = b_;
  return res;
}
} // end namespace thread_annot_lock_20

namespace thread_annot_lock_22 {
// Test various usage of GUARDED_BY and PT_GUARDED_BY annotations, especially
// uses in class definitions.
Mutex mu;

class Bar {
 public:
  int a_ GUARDED_BY(mu1_);
  int b_;
  int *q PT_GUARDED_BY(mu);
  Mutex mu1_ ACQUIRED_AFTER(mu);
};

Bar b1, *b3;
int *p GUARDED_BY(mu) PT_GUARDED_BY(mu);
int res GUARDED_BY(mu) = 5;

int func(int i)
{
  int x;
  mu.Lock();
  b1.mu1_.Lock();
  res = b1.a_ + b3->b_;
  *p = i;
  b1.a_ = res + b3->b_;
  b3->b_ = *b1.q;
  b1.mu1_.Unlock();
  b1.b_ = res;
  x = res;
  mu.Unlock();
  return x;
}
} // end namespace thread_annot_lock_22

namespace thread_annot_lock_27_modified {
// test lock annotations applied to function definitions
// Modified: applied annotations only to function declarations
Mutex mu1;
Mutex mu2 ACQUIRED_AFTER(mu1);

class Foo {
 public:
  int method1(int i) SHARED_LOCKS_REQUIRED(mu2) EXCLUSIVE_LOCKS_REQUIRED(mu1);
};

int Foo::method1(int i) {
  return i;
}


int foo(int i) EXCLUSIVE_LOCKS_REQUIRED(mu2) SHARED_LOCKS_REQUIRED(mu1);
int foo(int i) {
  return i;
}

static int bar(int i) EXCLUSIVE_LOCKS_REQUIRED(mu1);
static int bar(int i) {
  return i;
}

void main() {
  Foo a;

  mu1.Lock();
  mu2.Lock();
  a.method1(1);
  foo(2);
  mu2.Unlock();
  bar(3);
  mu1.Unlock();
}
} // end namespace thread_annot_lock_27_modified


namespace thread_annot_lock_38 {
// Test the case where a template member function is annotated with lock
// attributes in a non-template class.
class Foo {
 public:
  void func1(int y) LOCKS_EXCLUDED(mu_);
  template <typename T> void func2(T x) LOCKS_EXCLUDED(mu_);
 private:
  Mutex mu_;
};

Foo *foo;

void main()
{
  foo->func1(5);
  foo->func2(5);
}
} // end namespace thread_annot_lock_38

namespace thread_annot_lock_43 {
// Tests lock canonicalization
class Foo {
 public:
  Mutex *mu_;
};

class FooBar {
 public:
  Foo *foo_;
  int GetA() EXCLUSIVE_LOCKS_REQUIRED(foo_->mu_) { return a_; }
  int a_ GUARDED_BY(foo_->mu_);
};

FooBar *fb;

void main()
{
  int x;
  fb->foo_->mu_->Lock();
  x = fb->GetA();
  fb->foo_->mu_->Unlock();
}
} // end namespace thread_annot_lock_43

namespace thread_annot_lock_49 {
// Test the support for use of lock expression in the annotations
class Foo {
 public:
  Mutex foo_mu_;
};

class Bar {
 private:
  Foo *foo;
  Mutex bar_mu_ ACQUIRED_AFTER(foo->foo_mu_);

 public:
  void Test1() {
    foo->foo_mu_.Lock();
    bar_mu_.Lock();
    bar_mu_.Unlock();
    foo->foo_mu_.Unlock();
  }
};

void main() {
  Bar bar;
  bar.Test1();
}
} // end namespace thread_annot_lock_49

namespace thread_annot_lock_61_modified {
  // Modified to fix the compiler errors
  // Test the fix for a bug introduced by the support of pass-by-reference
  // paramters.
  struct Foo { Foo &operator<< (bool) {return *this;} };
  Foo &getFoo();
  struct Bar { Foo &func () {return getFoo();} };
  struct Bas { void operator& (Foo &) {} };
  void mumble()
  {
    Bas() & Bar().func() << "" << "";
    Bas() & Bar().func() << "";
  }
} // end namespace thread_annot_lock_61_modified


namespace thread_annot_lock_65 {
// Test the fix for a bug in the support of allowing reader locks for
// non-const, non-modifying overload functions. (We didn't handle the builtin
// properly.)
enum MyFlags {
  Zero,
  One,
  Two,
  Three,
  Four,
  Five,
  Six,
  Seven,
  Eight,
  Nine
};

inline MyFlags
operator|(MyFlags a, MyFlags b)
{
  return MyFlags(static_cast<int>(a) | static_cast<int>(b));
}

inline MyFlags&
operator|=(MyFlags& a, MyFlags b)
{
    return a = a | b;
}
} // end namespace thread_annot_lock_65

namespace thread_annot_lock_66_modified {
// Modified: Moved annotation to function defn
// Test annotations on out-of-line definitions of member functions where the
// annotations refer to locks that are also data members in the class.
Mutex mu;

class Foo {
 public:
  int method1(int i) SHARED_LOCKS_REQUIRED(mu1, mu, mu2);
  int data GUARDED_BY(mu1);
  Mutex *mu1;
  Mutex *mu2;
};

int Foo::method1(int i)
{
  return data + i;
}

void main()
{
  Foo a;

  a.mu2->Lock();
  a.mu1->Lock();
  mu.Lock();
  a.method1(1);
  mu.Unlock();
  a.mu1->Unlock();
  a.mu2->Unlock();
}
} // end namespace thread_annot_lock_66_modified

namespace thread_annot_lock_68_modified {
// Test a fix to a bug in the delayed name binding with nested template
// instantiation. We use a stack to make sure a name is not resolved to an
// inner context.
template <typename T>
class Bar {
  Mutex mu_;
};

template <typename T>
class Foo {
 public:
  void func(T x) {
    mu_.Lock();
    count_ = x;
    mu_.Unlock();
  }

 private:
  T count_ GUARDED_BY(mu_);
  Bar<T> bar_;
  Mutex mu_;
};

void main()
{
  Foo<int> *foo;
  foo->func(5);
}
} // end namespace thread_annot_lock_68_modified

namespace thread_annot_lock_30_modified {
// Test delay parsing of lock attribute arguments with nested classes.
// Modified: trylocks replaced with exclusive_lock_fun
int a = 0;

class Bar {
  struct Foo;

 public:
  void MyLock() EXCLUSIVE_LOCK_FUNCTION(mu);

  int func() {
    MyLock();
//    if (foo == 0) {
//      return 0;
//    }
    a = 5;
    mu.Unlock();
    return 1;
  }

  class FooBar {
    int x;
    int y;
  };

 private:
  Mutex mu;
};

Bar *bar;

void main()
{
  bar->func();
}
} // end namespace thread_annot_lock_30_modified

namespace thread_annot_lock_47 {
// Test the support for annotations on virtual functions.
// This is a good test case. (i.e. There should be no warning emitted by the
// compiler.)
class Base {
 public:
  virtual void func1() EXCLUSIVE_LOCKS_REQUIRED(mu_);
  virtual void func2() LOCKS_EXCLUDED(mu_);
  Mutex mu_;
};

class Child : public Base {
 public:
  virtual void func1() EXCLUSIVE_LOCKS_REQUIRED(mu_);
  virtual void func2() LOCKS_EXCLUDED(mu_);
};

void main() {
  Child *c;
  Base *b = c;

  b->mu_.Lock();
  b->func1();
  b->mu_.Unlock();
  b->func2();

  c->mu_.Lock();
  c->func1();
  c->mu_.Unlock();
  c->func2();
}
} // end namespace thread_annot_lock_47

//-----------------------------------------//
// Tests which produce errors
//-----------------------------------------//

namespace thread_annot_lock_13 {
Mutex mu1;
Mutex mu2;

int g GUARDED_BY(mu1);
int w GUARDED_BY(mu2);

class Foo {
 public:
  void bar() LOCKS_EXCLUDED(mu_, mu1);
  int foo() SHARED_LOCKS_REQUIRED(mu_) EXCLUSIVE_LOCKS_REQUIRED(mu2);

 private:
  int a_ GUARDED_BY(mu_);
 public:
  Mutex mu_ ACQUIRED_AFTER(mu1);
};

int Foo::foo()
{
  int res;
  w = 5.2;
  res = a_ + 5;
  return res;
}

void Foo::bar()
{
  int x;
  mu_.Lock();
  x = foo(); // expected-warning {{calling function 'foo' requires exclusive lock on 'mu2'}}
  a_ = x + 1;
  mu_.Unlock();
  if (x > 5) {
    mu1.Lock();
    g = 2.3;
    mu1.Unlock();
  }
}

void main()
{
  Foo f1, *f2;
  f1.mu_.Lock();
  f1.bar(); // expected-warning {{cannot call function 'bar' while mutex 'mu_' is locked}}
  mu2.Lock();
  f1.foo();
  mu2.Unlock();
  f1.mu_.Unlock();
  f2->mu_.Lock();
  f2->bar(); // expected-warning {{cannot call function 'bar' while mutex 'mu_' is locked}}
  f2->mu_.Unlock();
  mu2.Lock();
  w = 2.5;
  mu2.Unlock();
}
} // end namespace thread_annot_lock_13

namespace thread_annot_lock_18_modified {
// Modified: Trylocks removed
// Test the ability to distnguish between the same lock field of
// different objects of a class.
  class Bar {
 public:
  bool MyLock() EXCLUSIVE_LOCK_FUNCTION(mu1_);
  void MyUnlock() UNLOCK_FUNCTION(mu1_);
  int a_ GUARDED_BY(mu1_);

 private:
  Mutex mu1_;
};

Bar *b1, *b2;

void func()
{
  b1->MyLock();
  b1->a_ = 5;
  b2->a_ = 3; // expected-warning {{writing variable 'a_' requires locking 'mu1_' exclusively}}
  b2->MyLock();
  b2->MyUnlock();
  b1->MyUnlock();
}
} // end namespace thread_annot_lock_18_modified

namespace thread_annot_lock_21 {
// Test various usage of GUARDED_BY and PT_GUARDED_BY annotations, especially
// uses in class definitions.
Mutex mu;

class Bar {
 public:
  int a_ GUARDED_BY(mu1_);
  int b_;
  int *q PT_GUARDED_BY(mu);
  Mutex mu1_ ACQUIRED_AFTER(mu);
};

Bar b1, *b3;
int *p GUARDED_BY(mu) PT_GUARDED_BY(mu);

int res GUARDED_BY(mu) = 5;

int func(int i)
{
  int x;
  b3->mu1_.Lock();
  res = b1.a_ + b3->b_; // expected-warning {{reading variable 'a_' requires locking 'mu1_'}} \
    // expected-warning {{writing variable 'res' requires locking 'mu' exclusively}}
  *p = i; // expected-warning {{reading variable 'p' requires locking 'mu'}} \
    // expected-warning {{writing the value pointed to by 'p' requires locking 'mu' exclusively}}
  b1.a_ = res + b3->b_; // expected-warning {{reading variable 'res' requires locking 'mu'}} \
    // expected-warning {{writing variable 'a_' requires locking 'mu1_' exclusively}}
  b3->b_ = *b1.q; // expected-warning {{reading the value pointed to by 'q' requires locking 'mu'}}
  b3->mu1_.Unlock();
  b1.b_ = res; // expected-warning {{reading variable 'res' requires locking 'mu'}}
  x = res; // expected-warning {{reading variable 'res' requires locking 'mu'}}
  return x;
}
} // end namespace thread_annot_lock_21

namespace thread_annot_lock_35_modified {
// Test the analyzer's ability to distinguish the lock field of different
// objects.
class Foo {
 private:
  Mutex lock_;
  int a_ GUARDED_BY(lock_);

 public:
  void Func(Foo* child) LOCKS_EXCLUDED(lock_) {
     Foo *new_foo = new Foo;

     lock_.Lock();

     child->Func(new_foo); // There shouldn't be any warning here as the
                           // acquired lock is not in child.
     child->bar(7); // expected-warning {{calling function 'bar' requires exclusive lock on 'lock_'}}
     child->a_ = 5; // expected-warning {{writing variable 'a_' requires locking 'lock_' exclusively}}
     lock_.Unlock();
  }

  void bar(int y) EXCLUSIVE_LOCKS_REQUIRED(lock_) {
    a_ = y;
  }
};

Foo *x;

void main() {
  Foo *child = new Foo;
  x->Func(child);
}
} // end namespace thread_annot_lock_35_modified

namespace thread_annot_lock_36_modified {
// Modified to move the annotations to function defns.
// Test the analyzer's ability to distinguish the lock field of different
// objects
class Foo {
 private:
  Mutex lock_;
  int a_ GUARDED_BY(lock_);

 public:
  void Func(Foo* child) LOCKS_EXCLUDED(lock_);
  void bar(int y) EXCLUSIVE_LOCKS_REQUIRED(lock_);
};

void Foo::Func(Foo* child) {
  Foo *new_foo = new Foo;

  lock_.Lock();

  child->lock_.Lock();
  child->Func(new_foo); // expected-warning {{cannot call function 'Func' while mutex 'lock_' is locked}}
  child->bar(7);
  child->a_ = 5;
  child->lock_.Unlock();

  lock_.Unlock();
}

void Foo::bar(int y) {
  a_ = y;
}


Foo *x;

void main() {
  Foo *child = new Foo;
  x->Func(child);
}
} // end namespace thread_annot_lock_36_modified


namespace thread_annot_lock_42 {
// Test support of multiple lock attributes of the same kind on a decl.
class Foo {
 private:
  Mutex mu1, mu2, mu3;
  int x GUARDED_BY(mu1) GUARDED_BY(mu2);
  int y GUARDED_BY(mu2);

  void f2() LOCKS_EXCLUDED(mu1) LOCKS_EXCLUDED(mu2) LOCKS_EXCLUDED(mu3) {
    mu2.Lock();
    y = 2;
    mu2.Unlock();
  }

 public:
  void f1() EXCLUSIVE_LOCKS_REQUIRED(mu2) EXCLUSIVE_LOCKS_REQUIRED(mu1) {
    x = 5;
    f2(); // expected-warning {{cannot call function 'f2' while mutex 'mu1' is locked}} \
      // expected-warning {{cannot call function 'f2' while mutex 'mu2' is locked}}
  }
};

Foo *foo;

void func()
{
  foo->f1(); // expected-warning {{calling function 'f1' requires exclusive lock on 'mu2'}} \
    // expected-warning {{calling function 'f1' requires exclusive lock on 'mu1'}}
}
} // end namespace thread_annot_lock_42

namespace thread_annot_lock_46 {
// Test the support for annotations on virtual functions.
class Base {
 public:
  virtual void func1() EXCLUSIVE_LOCKS_REQUIRED(mu_);
  virtual void func2() LOCKS_EXCLUDED(mu_);
  Mutex mu_;
};

class Child : public Base {
 public:
  virtual void func1() EXCLUSIVE_LOCKS_REQUIRED(mu_);
  virtual void func2() LOCKS_EXCLUDED(mu_);
};

void main() {
  Child *c;
  Base *b = c;

  b->func1(); // expected-warning {{calling function 'func1' requires exclusive lock on 'mu_'}}
  b->mu_.Lock();
  b->func2(); // expected-warning {{cannot call function 'func2' while mutex 'mu_' is locked}}
  b->mu_.Unlock();

  c->func1(); // expected-warning {{calling function 'func1' requires exclusive lock on 'mu_'}}
  c->mu_.Lock();
  c->func2(); // expected-warning {{cannot call function 'func2' while mutex 'mu_' is locked}}
  c->mu_.Unlock();
}
} // end namespace thread_annot_lock_46

namespace thread_annot_lock_67_modified {
// Modified: attributes on definitions moved to declarations
// Test annotations on out-of-line definitions of member functions where the
// annotations refer to locks that are also data members in the class.
Mutex mu;
Mutex mu3;

class Foo {
 public:
  int method1(int i) SHARED_LOCKS_REQUIRED(mu1, mu, mu2, mu3);
  int data GUARDED_BY(mu1);
  Mutex *mu1;
  Mutex *mu2;
};

int Foo::method1(int i) {
  return data + i;
}

void main()
{
  Foo a;
  a.method1(1); // expected-warning {{calling function 'method1' requires shared lock on 'mu1'}} \
    // expected-warning {{calling function 'method1' requires shared lock on 'mu'}} \
    // expected-warning {{calling function 'method1' requires shared lock on 'mu2'}} \
    // expected-warning {{calling function 'method1' requires shared lock on 'mu3'}}
}
} // end namespace thread_annot_lock_67_modified


namespace substitution_test {
  class MyData  {
  public:
    Mutex mu;

    void lockData()    __attribute__((exclusive_lock_function(mu)))   { }
    void unlockData()  __attribute__((unlock_function(mu)))           { }

    void doSomething() __attribute__((exclusive_locks_required(mu)))  { }
  };


  class DataLocker {
  public:
    void lockData  (MyData *d) __attribute__((exclusive_lock_function(d->mu))) { }
    void unlockData(MyData *d) __attribute__((unlock_function(d->mu)))         { }
  };


  class Foo {
  public:
    void foo(MyData* d) __attribute__((exclusive_locks_required(d->mu))) { }

    void bar1(MyData* d) {
      d->lockData();
      foo(d);
      d->unlockData();
    }

    void bar2(MyData* d) {
      DataLocker dlr;
      dlr.lockData(d);
      foo(d);
      dlr.unlockData(d);
    }

    void bar3(MyData* d1, MyData* d2) {
      DataLocker dlr;
      dlr.lockData(d1);   // \
        // expected-warning {{mutex 'mu' is still locked at the end of function}}
      dlr.unlockData(d2); // \
        // expected-warning {{unlocking 'mu' that was not locked}}
    }

    void bar4(MyData* d1, MyData* d2) {
      DataLocker dlr;
      dlr.lockData(d1);
      foo(d2); // \
        // expected-warning {{calling function 'foo' requires exclusive lock on 'mu'}}
      dlr.unlockData(d1);
    }
  };
} // end namespace substituation_test



namespace constructor_destructor_tests {
  Mutex fooMu;
  int myVar GUARDED_BY(fooMu);

  class Foo {
  public:
    Foo()  __attribute__((exclusive_lock_function(fooMu))) { }
    ~Foo() __attribute__((unlock_function(fooMu))) { }
  };

  void fooTest() {
    Foo foo;
    myVar = 0;
  }
}


namespace invalid_lock_expression_test {

class LOCKABLE MyLockable {
public:
  MyLockable() __attribute__((exclusive_lock_function)) { }
  ~MyLockable() { }
};

// create an empty lock expression
void foo() {
  MyLockable lock;  // \
    // expected-warning {{cannot resolve lock expression}}
}

} // end namespace invalid_lock_expression_test

namespace template_member_test {

  struct S { int n; };
  struct T {
    Mutex m;
    S *s GUARDED_BY(this->m);
  };
  Mutex m;
  struct U {
    union {
      int n;
    };
  } *u GUARDED_BY(m);

  template<typename U>
  struct IndirectLock {
    int DoNaughtyThings(T *t) {
      u->n = 0; // expected-warning {{reading variable 'u' requires locking 'm'}}
      return t->s->n; // expected-warning {{reading variable 's' requires locking 'm'}}
    }
  };

  template struct IndirectLock<int>; // expected-note {{here}}

  struct V {
    void f(int);
    void f(double);

    Mutex m;
    V *p GUARDED_BY(this->m);
  };
  template<typename U> struct W {
    V v;
    void f(U u) {
      v.p->f(u); // expected-warning {{reading variable 'p' requires locking 'm'}}
    }
  };
  template struct W<int>; // expected-note {{here}}

}

namespace test_scoped_lockable {

struct TestScopedLockable {
  Mutex mu1;
  Mutex mu2;
  int a __attribute__((guarded_by(mu1)));
  int b __attribute__((guarded_by(mu2)));

  bool getBool();

  void foo1() {
    MutexLock mulock(&mu1);
    a = 5;
  }

  void foo2() {
    ReaderMutexLock mulock1(&mu1);
    if (getBool()) {
      MutexLock mulock2a(&mu2);
      b = a + 1;
    }
    else {
      MutexLock mulock2b(&mu2);
      b = a + 2;
    }
  }

  void foo3() {
    MutexLock mulock_a(&mu1);
    MutexLock mulock_b(&mu1); // \
      // expected-warning {{locking 'mu1' that is already locked}}
  }   // expected-warning {{unlocking 'mu1' that was not locked}}

  void foo4() {
    MutexLock mulock1(&mu1), mulock2(&mu2);
    a = b+1;
    b = a+1;
  }
};

} // end namespace test_scoped_lockable


namespace FunctionAttrTest {

class Foo {
public:
  Mutex mu_;
  int a GUARDED_BY(mu_);
};

Foo fooObj;

void foo() EXCLUSIVE_LOCKS_REQUIRED(fooObj.mu_);

void bar() {
  foo();  // expected-warning {{calling function 'foo' requires exclusive lock on 'mu_'}}
  fooObj.mu_.Lock();
  foo();
  fooObj.mu_.Unlock();
}

};  // end namespace FunctionAttrTest


struct TestTryLock {
  Mutex mu;
  int a GUARDED_BY(mu);
  bool cond;

  void foo1() {
    if (mu.TryLock()) {
      a = 1;
      mu.Unlock();
    }
  }

  void foo2() {
    if (!mu.TryLock()) return;
    a = 2;
    mu.Unlock();
  }

  void foo3() {
    bool b = mu.TryLock();
    if (b) {
      a = 3;
      mu.Unlock();
    }
  }

  void foo4() {
    bool b = mu.TryLock();
    if (!b) return;
    a = 4;
    mu.Unlock();
  }

  void foo5() {
    while (mu.TryLock()) {
      a = a + 1;
      mu.Unlock();
    }
  }

  void foo6() {
    bool b = mu.TryLock();
    b = !b;
    if (b) return;
    a = 6;
    mu.Unlock();
  }

  void foo7() {
    bool b1 = mu.TryLock();
    bool b2 = !b1;
    bool b3 = !b2;
    if (b3) {
      a = 7;
      mu.Unlock();
    }
  }

  // Test use-def chains: join points
  void foo8() {
    bool b  = mu.TryLock();
    bool b2 = b;
    if (cond)
      b = true;
    if (b) {    // b should be unknown at this point, becuase of the join point
      a = 8;    // expected-warning {{writing variable 'a' requires locking 'mu' exclusively}}
    }
    if (b2) {   // b2 should be known at this point.
      a = 8;
      mu.Unlock();
    }
  }

  // Test use-def-chains: back edges
  void foo9() {
    bool b = mu.TryLock();

    for (int i = 0; i < 10; ++i);

    if (b) {  // b is still known, because the loop doesn't alter it
      a = 9;
      mu.Unlock();
    }
  }

  // Test use-def chains: back edges
  void foo10() {
    bool b = mu.TryLock();

    while (cond) {
      if (b) {   // b should be uknown at this point b/c of the loop
        a = 10;  // expected-warning {{writing variable 'a' requires locking 'mu' exclusively}}
      }
      b = !b;
    }
  }
};  // end TestTrylock


namespace TestTemplateAttributeInstantiation {

class Foo1 {
public:
  Mutex mu_;
  int a GUARDED_BY(mu_);
};

class Foo2 {
public:
  int a GUARDED_BY(mu_);
  Mutex mu_;
};


class Bar {
public:
  // Test non-dependent expressions in attributes on template functions
  template <class T>
  void barND(Foo1 *foo, T *fooT) EXCLUSIVE_LOCKS_REQUIRED(foo->mu_) {
    foo->a = 0;
  }

  // Test dependent expressions in attributes on template functions
  template <class T>
  void barD(Foo1 *foo, T *fooT) EXCLUSIVE_LOCKS_REQUIRED(fooT->mu_) {
    fooT->a = 0;
  }
};


template <class T>
class BarT {
public:
  Foo1 fooBase;
  T    fooBaseT;

  // Test non-dependent expression in ordinary method on template class
  void barND() EXCLUSIVE_LOCKS_REQUIRED(fooBase.mu_) {
    fooBase.a = 0;
  }

  // Test dependent expressions in ordinary methods on template class
  void barD() EXCLUSIVE_LOCKS_REQUIRED(fooBaseT.mu_) {
    fooBaseT.a = 0;
  }

  // Test dependent expressions in template method in template class
  template <class T2>
  void barTD(T2 *fooT) EXCLUSIVE_LOCKS_REQUIRED(fooBaseT.mu_, fooT->mu_) {
    fooBaseT.a = 0;
    fooT->a = 0;
  }
};

template <class T>
class Cell {
public:
  Mutex mu_;
  // Test dependent guarded_by
  T data GUARDED_BY(mu_);

  void fooEx() EXCLUSIVE_LOCKS_REQUIRED(mu_) {
    data = 0;
  }

  void foo() {
    mu_.Lock();
    data = 0;
    mu_.Unlock();
  }
};

void test() {
  Bar b;
  BarT<Foo2> bt;
  Foo1 f1;
  Foo2 f2;

  f1.mu_.Lock();
  f2.mu_.Lock();
  bt.fooBase.mu_.Lock();
  bt.fooBaseT.mu_.Lock();

  b.barND(&f1, &f2);
  b.barD(&f1, &f2);
  bt.barND();
  bt.barD();
  bt.barTD(&f2);

  f1.mu_.Unlock();
  bt.barTD(&f1);  // \
    // expected-warning {{calling function 'barTD' requires exclusive lock on 'mu_'}}

  bt.fooBase.mu_.Unlock();
  bt.fooBaseT.mu_.Unlock();
  f2.mu_.Unlock();

  Cell<int> cell;
  cell.data = 0; // \
    // expected-warning {{writing variable 'data' requires locking 'mu_' exclusively}}
  cell.foo();
  cell.mu_.Lock();
  cell.fooEx();
  cell.mu_.Unlock();
}


template <class T>
class CellDelayed {
public:
  // Test dependent guarded_by
  T data GUARDED_BY(mu_);

  void fooEx(CellDelayed<T> *other) EXCLUSIVE_LOCKS_REQUIRED(mu_, other->mu_) {
    this->data = other->data;
  }

  template <class T2>
  void fooExT(CellDelayed<T2> *otherT) EXCLUSIVE_LOCKS_REQUIRED(mu_, otherT->mu_) {
    this->data = otherT->data;
  }

  void foo() {
    mu_.Lock();
    data = 0;
    mu_.Unlock();
  }

  Mutex mu_;
};

void testDelayed() {
  CellDelayed<int> celld;
  CellDelayed<int> celld2;
  celld.foo();
  celld.mu_.Lock();
  celld2.mu_.Lock();

  celld.fooEx(&celld2);
  celld.fooExT(&celld2);

  celld2.mu_.Unlock();
  celld.mu_.Unlock();
}

};  // end namespace TestTemplateAttributeInstantiation