clang/test/Sema/bitfield.c

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify -std=c11 -Wno-unused-value
   2
   3 enum e0; // expected-note{{forward declaration of 'enum e0'}}
   4
   5 struct a {
   6   int a : -1; // expected-error{{bit-field 'a' has negative width}}
   7
   8   // rdar://6081627
   9   int b : 33; // expected-error{{width of bit-field 'b' (33 bits) exceeds the width of its type (32 bits)}}
  10
  11   int c : (1 + 0.25); // expected-error{{integer constant expression must have integer type}}
  12   int d : (int)(1 + 0.25);
  13
  14   // rdar://6138816
  15   int e : 0;  // expected-error {{bit-field 'e' has zero width}}
  16
  17   float xx : 4;  // expected-error {{bit-field 'xx' has non-integral type}}
  18
  19   // PR3607
  20   enum e0 f : 1; // expected-error {{field has incomplete type 'enum e0'}}
  21
  22   int g : (_Bool)1;
  23
  24   // PR4017
  25   char : 10;      // expected-error {{width of anonymous bit-field (10 bits) exceeds the width of its type (8 bits)}}
  26   unsigned : -2;  // expected-error {{anonymous bit-field has negative width (-2)}}
  27   float : 12;     // expected-error {{anonymous bit-field has non-integral type 'float'}}
  28
  29   _Bool : 2;   // expected-error {{width of anonymous bit-field (2 bits) exceeds the width of its type (1 bit)}}
  30   _Bool h : 5; // expected-error {{width of bit-field 'h' (5 bits) exceeds the width of its type (1 bit)}}
  31 };
  32
  33 struct b {unsigned x : 2;} x;
  34 __typeof__(x.x+1) y;
  35 int y;
  36
  37 struct {unsigned x : 2;} x2;
  38 __typeof__((x.x+=1)+1) y;
  39 __typeof__((0,x.x)+1) y;
  40 __typeof__(x.x<<1) y;
  41 int y;
  42
  43 struct PR8025 {
  44   double : 2; // expected-error{{anonymous bit-field has non-integral type 'double'}}
  45 };
  46
  47 struct Test4 {
  48   unsigned bitX : 4;
  49   unsigned bitY : 4;
  50   unsigned var;
  51 };
  52 void test4(struct Test4 *t) {
  53   (void) sizeof(t->bitX); // expected-error {{invalid application of 'sizeof' to bit-field}}
  54   (void) sizeof((t->bitY)); // expected-error {{invalid application of 'sizeof' to bit-field}}
  55   (void) sizeof(t->bitX = 4); // not a bitfield designator in C
  56   (void) sizeof(t->bitX += 4); // not a bitfield designator in C
  57   (void) sizeof((void) 0, t->bitX); // not a bitfield designator in C
  58   (void) sizeof(t->var ? t->bitX : t->bitY); // not a bitfield designator in C
  59   (void) sizeof(t->var ? t->bitX : t->bitX); // not a bitfield designator in C
  60 }
  61
  62 typedef unsigned Unsigned;
  63 typedef signed Signed;
  64
  65 struct Test5 { unsigned n : 2; } t5;
  66 // Bitfield is unsigned
  67 struct Test5 sometest5 = {-1};
  68 typedef __typeof__(+t5.n) Signed;  // ... but promotes to signed.
  69
  70 typedef __typeof__(t5.n + 0) Signed; // Arithmetic promotes.
  71
  72 typedef __typeof__(+(t5.n = 0)) Signed;  // FIXME: Assignment should not; the result
  73 typedef __typeof__(+(t5.n += 0)) Signed; // is a non-bit-field lvalue of type unsigned.
  74 typedef __typeof__(+(t5.n *= 0)) Signed;
  75
  76 typedef __typeof__(+(++t5.n)) Signed; // FIXME: Increment is equivalent to compound-assignment.
  77 typedef __typeof__(+(--t5.n)) Signed; // This should not promote to signed.
  78
  79 typedef __typeof__(+(t5.n++)) Unsigned; // Post-increment is underspecified, but seems to
  80 typedef __typeof__(+(t5.n--)) Unsigned; // also act like compound-assignment.
  81
  82 struct Test6 {
  83   : 0.0; // expected-error{{type name requires a specifier or qualifier}}
  84 };
  85
  86 struct PR36157 {
  87   int n : 1 ? 1 : implicitly_declare_function(); // expected-error {{call to undeclared function 'implicitly_declare_function'; ISO C99 and later do not support implicit function declarations}}
  88 };