1 | // RUN: %clang_cc1 -fsyntax-only -verify -Wconversion \ |
2 | // RUN: -nostdsysteminc -nobuiltininc -isystem %S/Inputs \ |
3 | // RUN: -triple x86_64-apple-darwin %s -Wno-unreachable-code |
4 | |
5 | #include <conversion.h> |
6 | |
7 | #define BIG 0x7f7f7f7f7f7f7f7fL |
8 | |
9 | void test0(char c, short s, int i, long l, long long ll) { |
10 | c = c; |
11 | c = s; // expected-warning {{implicit conversion loses integer precision}} |
12 | c = i; // expected-warning {{implicit conversion loses integer precision}} |
13 | c = l; // expected-warning {{implicit conversion loses integer precision}} |
14 | s = c; |
15 | s = s; |
16 | s = i; // expected-warning {{implicit conversion loses integer precision}} |
17 | s = l; // expected-warning {{implicit conversion loses integer precision}} |
18 | i = c; |
19 | i = s; |
20 | i = i; |
21 | i = l; // expected-warning {{implicit conversion loses integer precision}} |
22 | l = c; |
23 | l = s; |
24 | l = i; |
25 | l = l; |
26 | |
27 | c = (char) 0; |
28 | c = (short) 0; |
29 | c = (int) 0; |
30 | c = (long) 0; |
31 | s = (char) 0; |
32 | s = (short) 0; |
33 | s = (int) 0; |
34 | s = (long) 0; |
35 | i = (char) 0; |
36 | i = (short) 0; |
37 | i = (int) 0; |
38 | i = (long) 0; |
39 | l = (char) 0; |
40 | l = (short) 0; |
41 | l = (int) 0; |
42 | l = (long) 0; |
43 | |
44 | c = (char) BIG; |
45 | c = (short) BIG; // expected-warning {{implicit conversion from 'short' to 'char' changes value}} |
46 | c = (int) BIG; // expected-warning {{implicit conversion from 'int' to 'char' changes value}} |
47 | c = (long) BIG; // expected-warning {{implicit conversion from 'long' to 'char' changes value}} |
48 | s = (char) BIG; |
49 | s = (short) BIG; |
50 | s = (int) BIG; // expected-warning {{implicit conversion from 'int' to 'short' changes value}} |
51 | s = (long) BIG; // expected-warning {{implicit conversion from 'long' to 'short' changes value}} |
52 | i = (char) BIG; |
53 | i = (short) BIG; |
54 | i = (int) BIG; |
55 | i = (long) BIG; // expected-warning {{implicit conversion from 'long' to 'int' changes value}} |
56 | l = (char) BIG; |
57 | l = (short) BIG; |
58 | l = (int) BIG; |
59 | l = (long) BIG; |
60 | } |
61 | |
62 | char test1(long long ll) { |
63 | return (long long) ll; // expected-warning {{implicit conversion loses integer precision}} |
64 | } |
65 | char test1_a(long long ll) { |
66 | return (long) ll; // expected-warning {{implicit conversion loses integer precision}} |
67 | } |
68 | char test1_b(long long ll) { |
69 | return (int) ll; // expected-warning {{implicit conversion loses integer precision}} |
70 | } |
71 | char test1_c(long long ll) { |
72 | return (short) ll; // expected-warning {{implicit conversion loses integer precision}} |
73 | } |
74 | char test1_d(long long ll) { |
75 | return (char) ll; |
76 | } |
77 | char test1_e(long long ll) { |
78 | return (long long) BIG; // expected-warning {{implicit conversion from 'long long' to 'char' changes value}} |
79 | } |
80 | char test1_f(long long ll) { |
81 | return (long) BIG; // expected-warning {{implicit conversion from 'long' to 'char' changes value}} |
82 | } |
83 | char test1_g(long long ll) { |
84 | return (int) BIG; // expected-warning {{implicit conversion from 'int' to 'char' changes value}} |
85 | } |
86 | char test1_h(long long ll) { |
87 | return (short) BIG; // expected-warning {{implicit conversion from 'short' to 'char' changes value}} |
88 | } |
89 | char test1_i(long long ll) { |
90 | return (char) BIG; |
91 | } |
92 | |
93 | short test2(long long ll) { |
94 | return (long long) ll; // expected-warning {{implicit conversion loses integer precision}} |
95 | } |
96 | short test2_a(long long ll) { |
97 | return (long) ll; // expected-warning {{implicit conversion loses integer precision}} |
98 | } |
99 | short test2_b(long long ll) { |
100 | return (int) ll; // expected-warning {{implicit conversion loses integer precision}} |
101 | } |
102 | short test2_c(long long ll) { |
103 | return (short) ll; |
104 | } |
105 | short test2_d(long long ll) { |
106 | return (char) ll; |
107 | } |
108 | short test2_e(long long ll) { |
109 | return (long long) BIG; // expected-warning {{implicit conversion from 'long long' to 'short' changes value}} |
110 | } |
111 | short test2_f(long long ll) { |
112 | return (long) BIG; // expected-warning {{implicit conversion from 'long' to 'short' changes value}} |
113 | } |
114 | short test2_g(long long ll) { |
115 | return (int) BIG; // expected-warning {{implicit conversion from 'int' to 'short' changes value}} |
116 | } |
117 | short test2_h(long long ll) { |
118 | return (short) BIG; |
119 | } |
120 | short test2_i(long long ll) { |
121 | return (char) BIG; |
122 | } |
123 | |
124 | int test3(long long ll) { |
125 | return (long long) ll; // expected-warning {{implicit conversion loses integer precision}} |
126 | } |
127 | int test3_b(long long ll) { |
128 | return (long) ll; // expected-warning {{implicit conversion loses integer precision}} |
129 | } |
130 | int test3_c(long long ll) { |
131 | return (int) ll; |
132 | } |
133 | int test3_d(long long ll) { |
134 | return (short) ll; |
135 | } |
136 | int test3_e(long long ll) { |
137 | return (char) ll; |
138 | } |
139 | int test3_f(long long ll) { |
140 | return (long long) BIG; // expected-warning {{implicit conversion from 'long long' to 'int' changes value}} |
141 | } |
142 | int test3_g(long long ll) { |
143 | return (long) BIG; // expected-warning {{implicit conversion from 'long' to 'int' changes value}} |
144 | } |
145 | int test3_h(long long ll) { |
146 | return (int) BIG; |
147 | } |
148 | int test3_i(long long ll) { |
149 | return (short) BIG; |
150 | } |
151 | int test3_j(long long ll) { |
152 | return (char) BIG; |
153 | } |
154 | |
155 | long test4(long long ll) { |
156 | return (long long) ll; |
157 | } |
158 | long test4_a(long long ll) { |
159 | return (long) ll; |
160 | } |
161 | long test4_b(long long ll) { |
162 | return (int) ll; |
163 | } |
164 | long test4_c(long long ll) { |
165 | return (short) ll; |
166 | } |
167 | long test4_d(long long ll) { |
168 | return (char) ll; |
169 | } |
170 | long test4_e(long long ll) { |
171 | return (long long) BIG; |
172 | } |
173 | long test4_f(long long ll) { |
174 | return (long) BIG; |
175 | } |
176 | long test4_g(long long ll) { |
177 | return (int) BIG; |
178 | } |
179 | long test4_h(long long ll) { |
180 | return (short) BIG; |
181 | } |
182 | long test4_i(long long ll) { |
183 | return (char) BIG; |
184 | } |
185 | |
186 | long long test5(long long ll) { |
187 | return (long long) ll; |
188 | return (long) ll; |
189 | return (int) ll; |
190 | return (short) ll; |
191 | return (char) ll; |
192 | return (long long) BIG; |
193 | return (long) BIG; |
194 | return (int) BIG; |
195 | return (short) BIG; |
196 | return (char) BIG; |
197 | } |
198 | |
199 | void takes_char(char); |
200 | void takes_short(short); |
201 | void takes_int(int); |
202 | void takes_long(long); |
203 | void takes_longlong(long long); |
204 | void takes_float(float); |
205 | void takes_double(double); |
206 | void takes_longdouble(long double); |
207 | |
208 | void test6(char v) { |
209 | takes_char(v); |
210 | takes_short(v); |
211 | takes_int(v); |
212 | takes_long(v); |
213 | takes_longlong(v); |
214 | takes_float(v); |
215 | takes_double(v); |
216 | takes_longdouble(v); |
217 | } |
218 | |
219 | void test7(short v) { |
220 | takes_char(v); // expected-warning {{implicit conversion loses integer precision}} |
221 | takes_short(v); |
222 | takes_int(v); |
223 | takes_long(v); |
224 | takes_longlong(v); |
225 | takes_float(v); |
226 | takes_double(v); |
227 | takes_longdouble(v); |
228 | } |
229 | |
230 | void test8(int v) { |
231 | takes_char(v); // expected-warning {{implicit conversion loses integer precision}} |
232 | takes_short(v); // expected-warning {{implicit conversion loses integer precision}} |
233 | takes_int(v); |
234 | takes_long(v); |
235 | takes_longlong(v); |
236 | takes_float(v); |
237 | takes_double(v); |
238 | takes_longdouble(v); |
239 | } |
240 | |
241 | void test9(long v) { |
242 | takes_char(v); // expected-warning {{implicit conversion loses integer precision}} |
243 | takes_short(v); // expected-warning {{implicit conversion loses integer precision}} |
244 | takes_int(v); // expected-warning {{implicit conversion loses integer precision}} |
245 | takes_long(v); |
246 | takes_longlong(v); |
247 | takes_float(v); |
248 | takes_double(v); |
249 | takes_longdouble(v); |
250 | } |
251 | |
252 | void test10(long long v) { |
253 | takes_char(v); // expected-warning {{implicit conversion loses integer precision}} |
254 | takes_short(v); // expected-warning {{implicit conversion loses integer precision}} |
255 | takes_int(v); // expected-warning {{implicit conversion loses integer precision}} |
256 | takes_long(v); |
257 | takes_longlong(v); |
258 | takes_float(v); |
259 | takes_double(v); |
260 | takes_longdouble(v); |
261 | } |
262 | |
263 | void test11(float v) { |
264 | takes_char(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
265 | takes_short(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
266 | takes_int(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
267 | takes_long(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
268 | takes_longlong(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
269 | takes_float(v); |
270 | takes_double(v); |
271 | takes_longdouble(v); |
272 | } |
273 | |
274 | void test12(double v) { |
275 | takes_char(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
276 | takes_short(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
277 | takes_int(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
278 | takes_long(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
279 | takes_longlong(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
280 | takes_float(v); // expected-warning {{implicit conversion loses floating-point precision}} |
281 | takes_double(v); |
282 | takes_longdouble(v); |
283 | } |
284 | |
285 | void test13(long double v) { |
286 | takes_char(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
287 | takes_short(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
288 | takes_int(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
289 | takes_long(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
290 | takes_longlong(v); // expected-warning {{implicit conversion turns floating-point number into integer}} |
291 | takes_float(v); // expected-warning {{implicit conversion loses floating-point precision}} |
292 | takes_double(v); // expected-warning {{implicit conversion loses floating-point precision}} |
293 | takes_longdouble(v); |
294 | } |
295 | |
296 | void test14(long l) { |
297 | // Fine because of the boolean whitelist. |
298 | char c; |
299 | c = (l == 4); |
300 | c = ((l <= 4) && (l >= 0)); |
301 | c = ((l <= 4) && (l >= 0)) || (l > 20); |
302 | } |
303 | |
304 | void test15(char c) { |
305 | c = c + 1 + c * 2; |
306 | c = (short) c + 1 + c * 2; // expected-warning {{implicit conversion loses integer precision}} |
307 | } |
308 | |
309 | // PR 5422 |
310 | extern void *test16_external; |
311 | void test16(void) { |
312 | int a = (unsigned long) &test16_external; // expected-warning {{implicit conversion loses integer precision}} |
313 | } |
314 | |
315 | // PR 5938 |
316 | void test17() { |
317 | union { |
318 | unsigned long long a : 8; |
319 | unsigned long long b : 32; |
320 | unsigned long long c; |
321 | } U; |
322 | |
323 | unsigned int x; |
324 | x = U.a; |
325 | x = U.b; |
326 | x = U.c; // expected-warning {{implicit conversion loses integer precision}} |
327 | } |
328 | |
329 | // PR 5939 |
330 | void test18() { |
331 | union { |
332 | unsigned long long a : 1; |
333 | unsigned long long b; |
334 | } U; |
335 | |
336 | int x; |
337 | x = (U.a ? 0 : 1); |
338 | x = (U.b ? 0 : 1); |
339 | } |
340 | |
341 | // None of these should warn. |
342 | unsigned char test19(unsigned long u64) { |
343 | unsigned char x1 = u64 & 0xff; |
344 | unsigned char x2 = u64 >> 56; |
345 | |
346 | unsigned char mask = 0xee; |
347 | unsigned char x3 = u64 & mask; |
348 | return x1 + x2 + x3; |
349 | } |
350 | |
351 | // <rdar://problem/7631400> |
352 | void test_7631400(void) { |
353 | // This should show up despite the caret being inside a macro substitution |
354 | char s = LONG_MAX; // expected-warning {{implicit conversion from 'long' to 'char' changes value}} |
355 | } |
356 | |
357 | // <rdar://problem/7676608>: assertion for compound operators with non-integral RHS |
358 | void f7676608(int); |
359 | void test_7676608(void) { |
360 | float q = 0.7f; |
361 | char c = 5; |
362 | f7676608(c *= q); // expected-warning {{conversion}} |
363 | } |
364 | |
365 | // <rdar://problem/7904686> |
366 | void test_7904686(void) { |
367 | const int i = -1; |
368 | unsigned u1 = i; // expected-warning {{implicit conversion changes signedness}} |
369 | u1 = i; // expected-warning {{implicit conversion changes signedness}} |
370 | |
371 | unsigned u2 = -1; // expected-warning {{implicit conversion changes signedness}} |
372 | u2 = -1; // expected-warning {{implicit conversion changes signedness}} |
373 | } |
374 | |
375 | // <rdar://problem/8232669>: don't warn about conversions required by |
376 | // contexts in system headers |
377 | void test_8232669(void) { |
378 | unsigned bitset[20]; |
379 | SETBIT(bitset, 0); |
380 | |
381 | unsigned y = 50; |
382 | SETBIT(bitset, y); |
383 | |
384 | #define USER_SETBIT(set,bit) do { int i = bit; set[i/(8*sizeof(set[0]))] |= (1 << (i%(8*sizeof(set)))); } while(0) |
385 | USER_SETBIT(bitset, 0); // expected-warning 2 {{implicit conversion changes signedness}} |
386 | } |
387 | |
388 | // <rdar://problem/8559831> |
389 | enum E8559831a { E8559831a_val }; |
390 | enum E8559831b { E8559831b_val }; |
391 | typedef enum { E8559831c_val } E8559831c; |
392 | enum { E8559831d_val } value_d; |
393 | |
394 | void test_8559831_a(enum E8559831a value); |
395 | void test_8559831(enum E8559831b value_a, E8559831c value_c) { |
396 | test_8559831_a(value_a); // expected-warning{{implicit conversion from enumeration type 'enum E8559831b' to different enumeration type 'enum E8559831a'}} |
397 | enum E8559831a a1 = value_a; // expected-warning{{implicit conversion from enumeration type 'enum E8559831b' to different enumeration type 'enum E8559831a'}} |
398 | a1 = value_a; // expected-warning{{implicit conversion from enumeration type 'enum E8559831b' to different enumeration type 'enum E8559831a'}} |
399 | |
400 | test_8559831_a(E8559831b_val); // expected-warning{{implicit conversion from enumeration type 'enum E8559831b' to different enumeration type 'enum E8559831a'}} |
401 | enum E8559831a a1a = E8559831b_val; // expected-warning{{implicit conversion from enumeration type 'enum E8559831b' to different enumeration type 'enum E8559831a'}} |
402 | a1 = E8559831b_val; // expected-warning{{implicit conversion from enumeration type 'enum E8559831b' to different enumeration type 'enum E8559831a'}} |
403 | |
404 | test_8559831_a(value_c); // expected-warning{{implicit conversion from enumeration type 'E8559831c' to different enumeration type 'enum E8559831a'}} |
405 | enum E8559831a a2 = value_c; // expected-warning{{implicit conversion from enumeration type 'E8559831c' to different enumeration type 'enum E8559831a'}} |
406 | a2 = value_c; // expected-warning{{implicit conversion from enumeration type 'E8559831c' to different enumeration type 'enum E8559831a'}} |
407 | |
408 | test_8559831_a(value_d); |
409 | enum E8559831a a3 = value_d; |
410 | a3 = value_d; |
411 | } |
412 | |
413 | void test26(int si, long sl) { |
414 | si = sl % sl; // expected-warning {{implicit conversion loses integer precision: 'long' to 'int'}} |
415 | si = sl % si; |
416 | si = si % sl; |
417 | si = si / sl; |
418 | si = sl / si; // expected-warning {{implicit conversion loses integer precision: 'long' to 'int'}} |
419 | } |
420 | |
421 | // rdar://16502418 |
422 | typedef unsigned short uint16_t; |
423 | typedef unsigned int uint32_t; |
424 | typedef __attribute__ ((ext_vector_type(16),__aligned__(32))) uint16_t ushort16; |
425 | typedef __attribute__ ((ext_vector_type( 8),__aligned__( 32))) uint32_t uint8; |
426 | |
427 | void test27(ushort16 constants) { |
428 | uint8 pairedConstants = (uint8) constants; |
429 | ushort16 crCbScale = pairedConstants.s4; // expected-warning {{implicit conversion loses integer precision: 'uint32_t' (aka 'unsigned int') to 'ushort16'}} |
430 | ushort16 brBias = pairedConstants.s6; // expected-warning {{implicit conversion loses integer precision: 'uint32_t' (aka 'unsigned int') to 'ushort16'}} |
431 | } |
432 | |
433 | |
434 | float double2float_test1(double a) { |
435 | return a; // expected-warning {{implicit conversion loses floating-point precision: 'double' to 'float'}} |
436 | } |
437 | |
438 | void double2float_test2(double a, float *b) { |
439 | *b += a; // expected-warning {{implicit conversion when assigning computation result loses floating-point precision: 'double' to 'float'}} |
440 | } |
441 | |
442 | float sinf (float x); |
443 | double double2float_test3(double a) { |
444 | return sinf(a); // expected-warning {{implicit conversion loses floating-point precision: 'double' to 'float'}} |
445 | } |
446 | |
447 | float double2float_test4(double a, float b) { |
448 | b -= a; // expected-warning {{implicit conversion when assigning computation result loses floating-point precision: 'double' to 'float'}} |
449 | return b; |
450 | } |
451 | |