test/Sema/pass-object-size.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -triple x86_64-linux-gnu -Wincompatible-pointer-types
   2 //
   3 // Tests for the pass_object_size attribute
   4 // Non-failure cases are covered in test/CodeGen/pass-object-size.c
   5
   6 void a(void *p __attribute__((pass_object_size))); //expected-error{{'pass_object_size' attribute takes one argument}}
   7 void b(void *p __attribute__((pass_object_size(1.0)))); //expected-error{{'pass_object_size' attribute requires parameter 1 to be an integer constant}}
   8
   9 void c(void *p __attribute__((pass_object_size(4)))); //expected-error{{'pass_object_size' attribute requires integer constant between 0 and 3 inclusive}}
  10 void d(void *p __attribute__((pass_object_size(-1)))); //expected-error{{'pass_object_size' attribute requires integer constant between 0 and 3 inclusive}}
  11
  12 void e(void *p __attribute__((pass_object_size(1ULL<<32)))); //expected-error{{integer constant expression evaluates to value 4294967296 that cannot be represented in a 32-bit unsigned integer type}}
  13
  14 void f(char p __attribute__((pass_object_size(0)))); //expected-error{{'pass_object_size' attribute only applies to constant pointer arguments}}
  15 void g(const char p __attribute__((pass_object_size(0)))); //expected-error{{'pass_object_size' attribute only applies to constant pointer arguments}}
  16 void h(char *p __attribute__((pass_object_size(0)))) {} //expected-error{{pass_object_size attribute only applies to constant pointer arguments}}
  17 void i(char *p __attribute__((pass_object_size(0)))); // OK -- const is only necessary on definitions, not decls.
  18 void j(char *p __attribute__((pass_object_size(0), pass_object_size(1)))); //expected-error{{'pass_object_size' attribute can only be applied once per parameter}}
  19
  20 #define PS(N) __attribute__((pass_object_size(N)))
  21 #define overloaded __attribute__((overloadable))
  22 void Overloaded(void *p PS(0)) overloaded; //expected-note{{previous declaration is here}}
  23 void Overloaded(void *p PS(1)) overloaded; //expected-error{{conflicting pass_object_size attributes on parameters}}
  24 void Overloaded2(void *p PS(1), void *p2 PS(0)) overloaded; //expected-note{{previous declaration is here}}
  25 void Overloaded2(void *p PS(0), void *p2 PS(1)) overloaded; //expected-error{{conflicting pass_object_size attributes on parameters}}
  26
  27 void Overloaded3(void *p PS(0), void *p2) overloaded; //expected-note{{previous declaration is here}}
  28 void Overloaded3(void *p, void *p2 PS(0)) overloaded; //expected-error{{conflicting pass_object_size attributes on parameters}}
  29
  30 void TakeFn(void (*)(void *));
  31 void TakeFnOvl(void (*)(void *)) overloaded;
  32 void TakeFnOvl(void (*)(int *)) overloaded;
  33
  34 void NotOverloaded(void *p PS(0));
  35 void IsOverloaded(void *p PS(0)) overloaded;
  36 void IsOverloaded(char *p) overloaded; // char* inestead of void* is intentional
  37 void FunctionPtrs() {
  38   void (*p)(void *) = NotOverloaded; //expected-error{{cannot take address of function 'NotOverloaded' because parameter 1 has pass_object_size attribute}}
  39   void (*p2)(void *) = &NotOverloaded; //expected-error{{cannot take address of function 'NotOverloaded' because parameter 1 has pass_object_size attribute}}
  40
  41   void (*p3)(void *) = IsOverloaded; //expected-warning{{incompatible pointer types initializing 'void (*)(void *)' with an expression of type '<overloaded function type>'}} expected-note@-6{{candidate address cannot be taken because parameter 1 has pass_object_size attribute}} expected-note@-5{{type mismatch}}
  42   void (*p4)(void *) = &IsOverloaded; //expected-warning{{incompatible pointer types initializing 'void (*)(void *)' with an expression of type '<overloaded function type>'}} expected-note@-7{{candidate address cannot be taken because parameter 1 has pass_object_size attribute}} expected-note@-6{{type mismatch}}
  43
  44   void (*p5)(char *) = IsOverloaded;
  45   void (*p6)(char *) = &IsOverloaded;
  46
  47   TakeFn(NotOverloaded); //expected-error{{cannot take address of function 'NotOverloaded' because parameter 1 has pass_object_size attribute}}
  48   TakeFn(&NotOverloaded); //expected-error{{cannot take address of function 'NotOverloaded' because parameter 1 has pass_object_size attribute}}
  49
  50   TakeFnOvl(NotOverloaded); //expected-error{{cannot take address of function 'NotOverloaded' because parameter 1 has pass_object_size attribute}}
  51   TakeFnOvl(&NotOverloaded); //expected-error{{cannot take address of function 'NotOverloaded' because parameter 1 has pass_object_size attribute}}
  52
  53   int P;
  54   (&NotOverloaded)(&P); //expected-error{{cannot take address of function 'NotOverloaded' because parameter 1 has pass_object_size attribute}}
  55   (&IsOverloaded)(&P); //expected-warning{{incompatible pointer types passing 'int *' to parameter of type 'char *'}} expected-note@36{{passing argument to parameter 'p' here}}
  56 }