clang/test/SemaCXX/ext-int.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -Wimplicit-int-conversion -Wno-unused -Wunevaluated-expression -triple x86_64-gnu-linux
   2
   3 template<int Bounds>
   4 struct HasExtInt {
   5   _BitInt(Bounds) b;
   6   unsigned _BitInt(Bounds) b2;
   7 };
   8
   9 // Delcaring variables:
  10 _BitInt(33) Declarations(_BitInt(48) &Param) { // Useable in params and returns.
  11   short _BitInt(43) a; // expected-error {{'short _BitInt' is invalid}}
  12   _BitInt(43) long b;  // expected-error {{'long _BitInt' is invalid}}
  13
  14   // These should all be fine:
  15   const _BitInt(5) c = 3;
  16   const unsigned _BitInt(5) d; // expected-error {{default initialization of an object of const type 'const unsigned _BitInt(5)'}}
  17   unsigned _BitInt(5) e = 5;
  18   _BitInt(5) unsigned f;
  19
  20   _BitInt(-3) g; // expected-error{{signed _BitInt must have a bit size of at least 2}}
  21   _BitInt(0) h; // expected-error{{signed _BitInt must have a bit size of at least 2}}
  22   _BitInt(1) i; // expected-error{{signed _BitInt must have a bit size of at least 2}}
  23   _BitInt(2) j;;
  24   unsigned _BitInt(0) k;// expected-error{{unsigned _BitInt must have a bit size of at least 1}}
  25   unsigned _BitInt(1) l;
  26   signed _BitInt(1) m; // expected-error{{signed _BitInt must have a bit size of at least 2}}
  27
  28   constexpr _BitInt(6) n = 33; // expected-warning{{implicit conversion from 'int' to 'const _BitInt(6)' changes value from 33 to -31}}
  29   constexpr _BitInt(7) o = 33;
  30
  31   // Check LLVM imposed max size.
  32   _BitInt(8388609) p;               // expected-error {{signed _BitInt of bit sizes greater than 8388608 not supported}}
  33   unsigned _BitInt(0xFFFFFFFFFF) q; // expected-error {{unsigned _BitInt of bit sizes greater than 8388608 not supported}}
  34
  35 // Ensure template params are instantiated correctly.
  36   // expected-error@5{{signed _BitInt must have a bit size of at least 2}}
  37   // expected-error@6{{unsigned _BitInt must have a bit size of at least 1}}
  38   // expected-note@+1{{in instantiation of template class }}
  39   HasExtInt<-1> r;
  40   // expected-error@5{{signed _BitInt must have a bit size of at least 2}}
  41   // expected-error@6{{unsigned _BitInt must have a bit size of at least 1}}
  42   // expected-note@+1{{in instantiation of template class }}
  43   HasExtInt<0> s;
  44   // expected-error@5{{signed _BitInt must have a bit size of at least 2}}
  45   // expected-note@+1{{in instantiation of template class }}
  46   HasExtInt<1> t;
  47   HasExtInt<2> u;
  48
  49   _BitInt(-3.0) v; // expected-error {{integral constant expression must have integral or unscoped enumeration type, not 'double'}}
  50   _BitInt(3.0) x; // expected-error {{integral constant expression must have integral or unscoped enumeration type, not 'double'}}
  51
  52   return 0;
  53 }
  54
  55 template <_BitInt(5) I>
  56 struct ExtIntTemplParam {
  57   static constexpr _BitInt(5) Var = I;
  58 };
  59
  60 template<typename T>
  61 void deduced_whole_type(T){}
  62 template<int I>
  63 void deduced_bound(_BitInt(I)){}
  64
  65 // Ensure ext-int can be used in template places.
  66 void Templates() {
  67   ExtIntTemplParam<13> a;
  68   constexpr _BitInt(3) b = 1;
  69   ExtIntTemplParam<b> c;
  70   constexpr _BitInt(9) d = 1;
  71   ExtIntTemplParam<b> e;
  72
  73   deduced_whole_type(b);
  74   deduced_bound(b);
  75 }
  76
  77 template <typename T, typename U>
  78 struct is_same {
  79   static constexpr bool value = false;
  80 };
  81 template <typename T>
  82 struct is_same<T,T> {
  83   static constexpr bool value = true;
  84 };
  85
  86 // Reject vector types:
  87 // expected-error@+1{{invalid vector element type '_BitInt(32)'}}
  88 typedef _BitInt(32) __attribute__((vector_size(16))) VecTy;
  89
  90 // Allow _Complex:
  91 _Complex _BitInt(3) Cmplx;
  92
  93 // Reject cases of _Atomic:
  94 // expected-error@+1{{_Atomic cannot be applied to integer type '_BitInt(4)'}}
  95 _Atomic _BitInt(4) TooSmallAtomic;
  96 // expected-error@+1{{_Atomic cannot be applied to integer type '_BitInt(9)'}}
  97 _Atomic _BitInt(9) NotPow2Atomic;
  98 // expected-error@+1{{_Atomic cannot be applied to integer type '_BitInt(128)'}}
  99 _Atomic _BitInt(128) JustRightAtomic;
 100
 101 // Test result types of Unary/Bitwise/Binary Operations:
 102 void Ops() {
 103   _BitInt(43) x43_s = 1, y43_s = 1;
 104   _BitInt(sizeof(int) * 8) x32_s = 1, y32_s = 1;
 105   unsigned _BitInt(sizeof(unsigned) * 8) x32_u = 1, y32_u = 1;
 106   _BitInt(4) x4_s = 1, y4_s = 1;
 107   unsigned _BitInt(43) x43_u = 1, y43_u = 1;
 108   unsigned _BitInt(4) x4_u = 1, y4_u = 1;
 109   int x_int = 1, y_int = 1;
 110   unsigned x_uint = 1, y_uint = 1;
 111   bool b;
 112
 113   // Signed/unsigned mixed.
 114   x43_u + y43_s;
 115   x4_s - y4_u;
 116   x43_s * y43_u;
 117   x4_u / y4_s;
 118
 119   // Different Sizes.
 120   x43_s + y4_s;
 121   x43_s - y4_u;
 122   x43_u * y4_u;
 123   x4_u / y43_u;
 124
 125   // Mixed with standard types.
 126   x43_s + x_int;
 127   x43_u - x_int;
 128   x32_s * x_int;
 129   x32_u / x_int;
 130   x32_s * x_uint;
 131   x32_u / x_uint;
 132   x4_s + x_int;
 133   x4_u - x_int;
 134   x4_s + b;
 135   x4_u - b;
 136   x43_s + b;
 137   x43_u - b;
 138   static_assert(is_same<decltype(x43_s + x_int), _BitInt(43)>::value, "");
 139   static_assert(is_same<decltype(x43_u + x_int), unsigned _BitInt(43)>::value, "");
 140   static_assert(is_same<decltype(x32_s + x_int), int>::value, "");
 141   static_assert(is_same<decltype(x32_u + x_int), unsigned int>::value, "");
 142   static_assert(is_same<decltype(x32_s + x_uint), unsigned int>::value, "");
 143   static_assert(is_same<decltype(x32_u + x_uint), unsigned int>::value, "");
 144   static_assert(is_same<decltype(x4_s + x_int), int>::value, "");
 145   static_assert(is_same<decltype(x4_u + x_int), int>::value, "");
 146   static_assert(is_same<decltype(x4_s + x_uint), unsigned int>::value, "");
 147   static_assert(is_same<decltype(x4_u + x_uint), unsigned int>::value, "");
 148
 149   // Bitwise checks.
 150   x43_s % y4_u;
 151   x43_u % y4_s;
 152   x4_s | y43_u;
 153   x4_u | y43_s;
 154
 155   // compassign.
 156   x43_s += 33;
 157
 158   // Comparisons.
 159   x43_s > 33;
 160   x4_s > 33; // expected-warning {{result of comparison of constant 33 with expression of type '_BitInt(4)' is always false}}
 161
 162   // Same size/sign ops don't change type.
 163   static_assert(is_same<decltype(x43_s + y43_s), _BitInt(43)>::value,"");
 164   static_assert(is_same<decltype(x4_s - y4_s), _BitInt(4)>::value,"");
 165   static_assert(is_same<decltype(x43_u * y43_u), unsigned _BitInt(43)>::value,"");
 166   static_assert(is_same<decltype(x4_u / y4_u), unsigned _BitInt(4)>::value,"");
 167
 168   // Unary ops shouldn't go through integer promotions.
 169   static_assert(is_same<decltype(~x43_s), _BitInt(43)>::value,"");
 170   static_assert(is_same<decltype(~x4_s), _BitInt(4)>::value,"");
 171   static_assert(is_same<decltype(+x43_s), _BitInt(43)>::value,"");
 172   static_assert(is_same<decltype(+x4_s), _BitInt(4)>::value,"");
 173   static_assert(is_same<decltype(-x43_u), unsigned _BitInt(43)>::value,"");
 174   static_assert(is_same<decltype(-x4_u), unsigned _BitInt(4)>::value,"");
 175   // expected-warning@+1{{expression with side effects has no effect in an unevaluated context}}
 176   static_assert(is_same<decltype(++x43_s), _BitInt(43)&>::value,"");
 177   // expected-warning@+1{{expression with side effects has no effect in an unevaluated context}}
 178   static_assert(is_same<decltype(--x4_s), _BitInt(4)&>::value,"");
 179   // expected-warning@+1{{expression with side effects has no effect in an unevaluated context}}
 180   static_assert(is_same<decltype(x43_s--), _BitInt(43)>::value,"");
 181   // expected-warning@+1{{expression with side effects has no effect in an unevaluated context}}
 182   static_assert(is_same<decltype(x4_s++), _BitInt(4)>::value,"");
 183   static_assert(is_same<decltype(x4_s >> 1), _BitInt(4)>::value,"");
 184   static_assert(is_same<decltype(x4_u << 1), unsigned _BitInt(4)>::value,"");
 185
 186   static_assert(sizeof(x43_s) == 8, "");
 187   static_assert(sizeof(x4_s) == 1, "");
 188
 189   static_assert(sizeof(_BitInt(3340)) == 424, ""); // 424 * 8 == 3392.
 190   static_assert(sizeof(_BitInt(1049)) == 136, ""); // 136  *  8 == 1088.
 191
 192   static_assert(alignof(decltype(x43_s)) == 8, "");
 193   static_assert(alignof(decltype(x4_s)) == 1, "");
 194
 195   static_assert(alignof(_BitInt(3340)) == 8, "");
 196   static_assert(alignof(_BitInt(1049)) == 8, "");
 197 }
 198
 199 constexpr int func() { return 42;}
 200
 201 void ConstexprBitsize() {
 202   _BitInt(func()) F;
 203   static_assert(is_same<decltype(F), _BitInt(42)>::value, "");
 204 }
 205
 206 // Useable as an underlying type.
 207 enum AsEnumUnderlyingType : _BitInt(33) {
 208 };
 209
 210 void overloaded(int);
 211 void overloaded(_BitInt(32));
 212 void overloaded(_BitInt(33));
 213 void overloaded(short);
 214 //expected-note@+1{{candidate function}}
 215 void overloaded2(_BitInt(32));
 216 //expected-note@+1{{candidate function}}
 217 void overloaded2(_BitInt(33));
 218 //expected-note@+1{{candidate function}}
 219 void overloaded2(short);
 220
 221 void overload_use() {
 222   int i;
 223   _BitInt(32) i32;
 224   _BitInt(33) i33;
 225   short s;
 226
 227   // All of these get their corresponding exact matches.
 228   overloaded(i);
 229   overloaded(i32);
 230   overloaded(i33);
 231   overloaded(s);
 232
 233   overloaded2(i); // expected-error{{call to 'overloaded2' is ambiguous}}
 234
 235   overloaded2(i32);
 236
 237   overloaded2(s);
 238 }
 239
 240 // no errors expected, this should 'just work'.
 241 struct UsedAsBitField {
 242   _BitInt(3) F : 3;
 243   _BitInt(3) G : 3;
 244   _BitInt(3) H : 3;
 245 };
 246
 247 struct CursedBitField {
 248   _BitInt(4) A : 8; // expected-warning {{width of bit-field 'A' (8 bits) exceeds the width of its type; value will be truncated to 4 bits}}
 249 };
 250
 251 // expected-error@+1{{mode attribute only supported for integer and floating-point types}}
 252 typedef _BitInt(33) IllegalMode __attribute__((mode(DI)));
 253
 254 void ImplicitCasts(_BitInt(31) s31, _BitInt(33) s33, int i) {
 255   // expected-warning@+1{{implicit conversion loses integer precision}}
 256   s31 = i;
 257   // expected-warning@+1{{implicit conversion loses integer precision}}
 258   s31 = s33;
 259   s33 = i;
 260   s33 = s31;
 261   i = s31;
 262   // expected-warning@+1{{implicit conversion loses integer precision}}
 263   i = s33;
 264 }
 265
 266 void Ternary(_BitInt(30) s30, _BitInt(31) s31a, _BitInt(31) s31b,
 267              _BitInt(32) s32, bool b) {
 268   b ? s30 : s31a;
 269   b ? s31a : s30;
 270   b ? s32 : (int)0;
 271   (void)(b ? s31a : s31b);
 272   (void)(s30 ? s31a : s31b);
 273
 274   static_assert(is_same<decltype(b ? s30 : s31a), _BitInt(31)>::value, "");
 275   static_assert(is_same<decltype(b ? s32 : s30), _BitInt(32)>::value, "");
 276   static_assert(is_same<decltype(b ? s30 : 0), int>::value, "");
 277 }
 278
 279 void FromPaper1() {
 280   // Test the examples of conversion and promotion rules from C2x 6.3.1.8.
 281   _BitInt(2) a2 = 1;
 282   _BitInt(3) a3 = 2;
 283   _BitInt(33) a33 = 1;
 284   char c = 3;
 285
 286   static_assert(is_same<decltype(a2 * a3), _BitInt(3)>::value, "");
 287   static_assert(is_same<decltype(a2 * c), int>::value, "");
 288   static_assert(is_same<decltype(a33 * c), _BitInt(33)>::value, "");
 289 }
 290
 291 void FromPaper2(_BitInt(8) a1, _BitInt(24) a2) {
 292   static_assert(is_same<decltype(a1 * (_BitInt(32))a2), _BitInt(32)>::value, "");
 293 }