llvm-project/clang/test/Sema/expr-address-of.c

// RUN: clang %s -verify -fsyntax-only
struct xx { int bitf:1; };

struct entry { struct xx *whatever; 
               int value; 
               int bitf:1; };
void add_one(int *p) { (*p)++; }

void test() {
 register struct entry *p;
 add_one(&p->value);
 struct entry pvalue;
 add_one(&p->bitf);  // expected-error {{address of bit-field requested}}
 add_one(&pvalue.bitf); // expected-error {{address of bit-field requested}}
 add_one(&p->whatever->bitf); // expected-error {{address of bit-field requested}}
}

void foo() {
  register int x[10];
  &x[10];              // expected-error {{address of register variable requested}}
    
  register int *y;
  
  int *x2 = &y; // expected-error {{address of register variable requested}}
  int *x3 = &y[10];
}

void testVectorComponentAccess() {
  typedef float v4sf __attribute__ ((vector_size (16)));
  static v4sf q;
  float* r = &q[0]; // expected-error {{address of vector requested}}
}


void f0() {
  register int *x0;
  int *_dummy0 = &(*x0);

  register int *x1;
  int *_dummy1 = &(*(x1 + 1));
}

void f1() {
  register int x0[10];
  int *_dummy0 = &(*x0); // expected-error {{address of register variable requested}}

  register int x1[10];
  int *_dummy1 = &(*(x1 + 1)); // expected-error {{address of register variable requested}}

  register int *x2;
  int *_dummy2 = &(*(x2 + 1));

  register int x3[10][10][10];
  int *_dummy3 = &x3[0][0]; // expected-error {{address of register variable requested}}

  register struct { int f0[10]; } x4;
  int *_dummy4 = &x4.f0[2]; // expected-error {{address of register variable requested}}
}

void f2() {
  register int *y;
  
  int *_dummy0 = &y; // expected-error {{address of register variable requested}}
  int *_dummy1 = &y[10];
}

void f3() {
  extern void f4();
  void (*_dummy0)() = &****f4;
}

void f4() {
  register _Complex int x;
  
  int *_dummy0 = &__real__ x; // expected-error {{address of register variable requested}}
}

void f5() {
  register int arr[2];

  /* This is just here because if we happened to support this as an
     lvalue we would need to give a warning. Note that gcc warns about
     this as a register before it warns about it as an invalid
     lvalue. */
  int *_dummy0 = &(int*) arr; // expected-error {{address expression must be an lvalue or a function designator}}
  int *_dummy1 = &(arr + 1); // expected-error {{address expression must be an lvalue or a function designator}}
}