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   _ExtInt(Bounds) b;
6   unsigned _ExtInt(Bounds) b2;
7 };
8 
9 // Delcaring variables:
10 _ExtInt(33) Declarations(_ExtInt(48) &Param) { // Useable in params and returns.
11   short _ExtInt(43) a; // expected-error {{'short _ExtInt' is invalid}}
12   _ExtInt(43) long b;  // expected-error {{'long _ExtInt' is invalid}}
13 
14   // These should all be fine:
15   const _ExtInt(5) c = 3;
16   const unsigned _ExtInt(5) d; // expected-error {{default initialization of an object of const type 'const unsigned _ExtInt(5)'}}
17   unsigned _ExtInt(5) e = 5;
18   _ExtInt(5) unsigned f;
19 
20   _ExtInt(-3) g; // expected-error{{signed _ExtInt must have a bit size of at least 2}}
21   _ExtInt(0) h; // expected-error{{signed _ExtInt must have a bit size of at least 2}}
22   _ExtInt(1) i; // expected-error{{signed _ExtInt must have a bit size of at least 2}}
23   _ExtInt(2) j;;
24   unsigned _ExtInt(0) k;// expected-error{{unsigned _ExtInt must have a bit size of at least 1}}
25   unsigned _ExtInt(1) l;
26   signed _ExtInt(1) m; // expected-error{{signed _ExtInt must have a bit size of at least 2}}
27 
28   constexpr _ExtInt(6) n = 33; // expected-warning{{implicit conversion from 'int' to 'const _ExtInt(6)' changes value from 33 to -31}}
29   constexpr _ExtInt(7) o = 33;
30 
31   // Check LLVM imposed max size.
32   _ExtInt(0xFFFFFFFFFF) p; // expected-error {{signed _ExtInt of bit sizes greater than 16777215 not supported}}
33   unsigned _ExtInt(0xFFFFFFFFFF) q; // expected-error {{unsigned _ExtInt of bit sizes greater than 16777215 not supported}}
34 
35 // Ensure template params are instantiated correctly.
36   // expected-error@5{{signed _ExtInt must have a bit size of at least 2}}
37   // expected-error@6{{unsigned _ExtInt 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 _ExtInt must have a bit size of at least 2}}
41   // expected-error@6{{unsigned _ExtInt 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 _ExtInt 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   _ExtInt(-3.0) v; // expected-error {{integral constant expression must have integral or unscoped enumeration type, not 'double'}}
50   _ExtInt(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 <_ExtInt(5) I>
56 struct ExtIntTemplParam {
57   static constexpr _ExtInt(5) Var = I;
58 };
59 
60 template<typename T>
61 void deduced_whole_type(T){}
62 template<int I>
63 void deduced_bound(_ExtInt(I)){}
64 
65 // Ensure ext-int can be used in template places.
66 void Templates() {
67   ExtIntTemplParam<13> a;
68   constexpr _ExtInt(3) b = 1;
69   ExtIntTemplParam<b> c;
70   constexpr _ExtInt(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 '_ExtInt(32)'}}
88 typedef _ExtInt(32) __attribute__((vector_size(16))) VecTy;
89 
90 // Allow _Complex:
91 _Complex _ExtInt(3) Cmplx;
92 
93 // Reject cases of _Atomic:
94 // expected-error@+1{{_Atomic cannot be applied to integer type '_ExtInt(4)'}}
95 _Atomic _ExtInt(4) TooSmallAtomic;
96 // expected-error@+1{{_Atomic cannot be applied to integer type '_ExtInt(9)'}}
97 _Atomic _ExtInt(9) NotPow2Atomic;
98 // expected-error@+1{{_Atomic cannot be applied to integer type '_ExtInt(128)'}}
99 _Atomic _ExtInt(128) JustRightAtomic;
100 
101 // Test result types of Unary/Bitwise/Binary Operations:
102 void Ops() {
103   _ExtInt(43) x43_s = 1, y43_s = 1;
104   _ExtInt(sizeof(int) * 8) x32_s = 1, y32_s = 1;
105   unsigned _ExtInt(sizeof(unsigned) * 8) x32_u = 1, y32_u = 1;
106   _ExtInt(4) x4_s = 1, y4_s = 1;
107   unsigned _ExtInt(43) x43_u = 1, y43_u = 1;
108   unsigned _ExtInt(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), _ExtInt(43)>::value, "");
139   static_assert(is_same<decltype(x43_u + x_int), unsigned _ExtInt(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 '_ExtInt(4)' is always false}}
161 
162   // Same size/sign ops don't change type.
163   static_assert(is_same<decltype(x43_s + y43_s), _ExtInt(43)>::value,"");
164   static_assert(is_same<decltype(x4_s - y4_s), _ExtInt(4)>::value,"");
165   static_assert(is_same<decltype(x43_u * y43_u), unsigned _ExtInt(43)>::value,"");
166   static_assert(is_same<decltype(x4_u / y4_u), unsigned _ExtInt(4)>::value,"");
167 
168   // Unary ops shouldn't go through integer promotions.
169   static_assert(is_same<decltype(~x43_s), _ExtInt(43)>::value,"");
170   static_assert(is_same<decltype(~x4_s), _ExtInt(4)>::value,"");
171   static_assert(is_same<decltype(+x43_s), _ExtInt(43)>::value,"");
172   static_assert(is_same<decltype(+x4_s), _ExtInt(4)>::value,"");
173   static_assert(is_same<decltype(-x43_u), unsigned _ExtInt(43)>::value,"");
174   static_assert(is_same<decltype(-x4_u), unsigned _ExtInt(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), _ExtInt(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), _ExtInt(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--), _ExtInt(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++), _ExtInt(4)>::value,"");
183   static_assert(is_same<decltype(x4_s >> 1), _ExtInt(4)>::value,"");
184   static_assert(is_same<decltype(x4_u << 1), unsigned _ExtInt(4)>::value,"");
185 
186   static_assert(sizeof(x43_s) == 8, "");
187   static_assert(sizeof(x4_s) == 1, "");
188 
189   static_assert(sizeof(_ExtInt(3340)) == 424, ""); // 424 * 8 == 3392.
190   static_assert(sizeof(_ExtInt(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(_ExtInt(3340)) == 8, "");
196   static_assert(alignof(_ExtInt(1049)) == 8, "");
197 }
198 
199 constexpr int func() { return 42;}
200 
201 void ConstexprBitsize() {
202   _ExtInt(func()) F;
203   static_assert(is_same<decltype(F), _ExtInt(42)>::value, "");
204 }
205 
206 // Useable as an underlying type.
207 enum AsEnumUnderlyingType : _ExtInt(33) {
208 };
209 
210 void overloaded(int);
211 void overloaded(_ExtInt(32));
212 void overloaded(_ExtInt(33));
213 void overloaded(short);
214 //expected-note@+1{{candidate function}}
215 void overloaded2(_ExtInt(32));
216 //expected-note@+1{{candidate function}}
217 void overloaded2(_ExtInt(33));
218 //expected-note@+1{{candidate function}}
219 void overloaded2(short);
220 
221 void overload_use() {
222   int i;
223   _ExtInt(32) i32;
224   _ExtInt(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   _ExtInt(3) F : 3;
243   _ExtInt(3) G : 3;
244   _ExtInt(3) H : 3;
245 };
246 
247 struct CursedBitField {
248   _ExtInt(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 _ExtInt(33) IllegalMode __attribute__((mode(DI)));
253 
254 void ImplicitCasts(_ExtInt(31) s31, _ExtInt(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(_ExtInt(30) s30, _ExtInt(31) s31a, _ExtInt(31) s31b,
267              _ExtInt(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), _ExtInt(31)>::value, "");
275   static_assert(is_same<decltype(b ? s32 : s30), _ExtInt(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   _ExtInt(2) a2 = 1;
282   _ExtInt(3) a3 = 2;
283   _ExtInt(33) a33 = 1;
284   char c = 3;
285 
286   static_assert(is_same<decltype(a2 * a3), _ExtInt(3)>::value, "");
287   static_assert(is_same<decltype(a2 * c), int>::value, "");
288   static_assert(is_same<decltype(a33 * c), _ExtInt(33)>::value, "");
289 }
290 
291 void FromPaper2(_ExtInt(8) a1, _ExtInt(24) a2) {
292   static_assert(is_same<decltype(a1 * (_ExtInt(32))a2), _ExtInt(32)>::value, "");
293 }
294