1 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV0 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V0
2 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV1 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V1
3 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV2 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V2
4 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV3 -o %t && %run %t 2>&1 | not FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V3
5 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV4 -o %t && %run %t 2>&1 | not FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V4
6 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV5 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V5
7 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV6 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V6
8 // RUN: %clang   -x c   -fsanitize=implicit-unsigned-integer-truncation %s -DV7 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V7
9 
10 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV0 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V0
11 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV1 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V1
12 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV2 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V2
13 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV3 -o %t && %run %t 2>&1 | not FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V3
14 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV4 -o %t && %run %t 2>&1 | not FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V4
15 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV5 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V5
16 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV6 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V6
17 // RUN: %clang   -x c++ -fsanitize=implicit-unsigned-integer-truncation %s -DV7 -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="implicit conversion" --check-prefixes=CHECK-V7
18 
19 #include <stdint.h>
20 
21 // Test plan:
22 //  * Two types - int and char
23 //  * Two signs - signed and unsigned
24 //  * Square that - we have input and output types.
25 // Thus, there are total of (2*2)^2 == 16 tests.
26 // These are all the possible variations/combinations of casts.
27 // However, not all of them should result in the check.
28 // So here, we *only* check which should and which should not result in checks.
29 
30 unsigned int convert_unsigned_int_to_unsigned_int(unsigned int x) {
31 #line 100
32   return x;
33 }
34 
35 unsigned char convert_unsigned_char_to_unsigned_char(unsigned char x) {
36 #line 200
37   return x;
38 }
39 
40 signed int convert_signed_int_to_signed_int(signed int x) {
41 #line 300
42   return x;
43 }
44 
45 signed char convert_signed_char_to_signed_char(signed char x) {
46 #line 400
47   return x;
48 }
49 
50 unsigned char convert_unsigned_int_to_unsigned_char(unsigned int x) {
51 #line 500
52   return x;
53 }
54 
55 unsigned int convert_unsigned_char_to_unsigned_int(unsigned char x) {
56 #line 600
57   return x;
58 }
59 
60 signed int convert_unsigned_char_to_signed_int(unsigned char x) {
61 #line 700
62   return x;
63 }
64 
65 signed int convert_signed_char_to_signed_int(signed char x) {
66 #line 800
67   return x;
68 }
69 
70 signed int convert_unsigned_int_to_signed_int(unsigned int x) {
71 #line 900
72   return x;
73 }
74 
75 unsigned int convert_signed_int_to_unsigned_int(signed int x) {
76 #line 1000
77   return x;
78 }
79 
80 unsigned char convert_signed_int_to_unsigned_char(signed int x) {
81 #line 1100
82   return x;
83 }
84 
85 unsigned char convert_signed_char_to_unsigned_char(signed char x) {
86 #line 1200
87   return x;
88 }
89 
90 signed char convert_unsigned_char_to_signed_char(unsigned char x) {
91 #line 1300
92   return x;
93 }
94 
95 unsigned int convert_signed_char_to_unsigned_int(signed char x) {
96 #line 1400
97   return x;
98 }
99 
100 signed char convert_unsigned_int_to_signed_char(unsigned int x) {
101 #line 1500
102   return x;
103 }
104 
105 signed char convert_signed_int_to_signed_char(signed int x) {
106 #line 1600
107   return x;
108 }
109 
110 #line 1111 // !!!
111 
112 int main() {
113   // No bits set.
114   convert_unsigned_int_to_unsigned_int(0);
115   convert_unsigned_char_to_unsigned_char(0);
116   convert_signed_int_to_signed_int(0);
117   convert_signed_char_to_signed_char(0);
118   convert_unsigned_int_to_unsigned_char(0);
119   convert_unsigned_char_to_unsigned_int(0);
120   convert_unsigned_char_to_signed_int(0);
121   convert_signed_char_to_signed_int(0);
122   convert_unsigned_int_to_signed_int(0);
123   convert_signed_int_to_unsigned_int(0);
124   convert_signed_int_to_unsigned_char(0);
125   convert_signed_char_to_unsigned_char(0);
126   convert_unsigned_char_to_signed_char(0);
127   convert_signed_char_to_unsigned_int(0);
128   convert_unsigned_int_to_signed_char(0);
129   convert_signed_int_to_signed_char(0);
130 
131   // One lowest bit set.
132   convert_unsigned_int_to_unsigned_int(1);
133   convert_unsigned_char_to_unsigned_char(1);
134   convert_signed_int_to_signed_int(1);
135   convert_signed_char_to_signed_char(1);
136   convert_unsigned_int_to_unsigned_char(1);
137   convert_unsigned_char_to_unsigned_int(1);
138   convert_unsigned_char_to_signed_int(1);
139   convert_signed_char_to_signed_int(1);
140   convert_unsigned_int_to_signed_int(1);
141   convert_signed_int_to_unsigned_int(1);
142   convert_signed_int_to_unsigned_char(1);
143   convert_signed_char_to_unsigned_char(1);
144   convert_unsigned_char_to_signed_char(1);
145   convert_signed_char_to_unsigned_int(1);
146   convert_unsigned_int_to_signed_char(1);
147   convert_signed_int_to_signed_char(1);
148 
149 #if defined(V0)
150   // All source bits set.
151   convert_unsigned_int_to_unsigned_int((uint32_t)UINT32_MAX);
152   convert_unsigned_char_to_unsigned_char((uint8_t)UINT8_MAX);
153   convert_signed_int_to_signed_int((int32_t)(uint32_t)UINT32_MAX);
154   convert_signed_char_to_signed_char((int8_t)UINT8_MAX);
155   convert_unsigned_int_to_unsigned_char((uint32_t)UINT32_MAX);
156 // CHECK-V0: {{.*}}unsigned-integer-truncation.c:500:10: runtime error: implicit conversion from type 'unsigned int' of value 4294967295 (32-bit, unsigned) to type 'unsigned char' changed the value to 255 (8-bit, unsigned
157   convert_unsigned_char_to_unsigned_int((uint8_t)UINT8_MAX);
158   convert_unsigned_char_to_signed_int((uint8_t)UINT8_MAX);
159   convert_signed_char_to_signed_int((int8_t)UINT8_MAX);
160   convert_unsigned_int_to_signed_int((uint32_t)UINT32_MAX);
161   convert_signed_int_to_unsigned_int((int32_t)(uint32_t)UINT32_MAX);
162   convert_signed_int_to_unsigned_char((int32_t)(uint32_t)UINT32_MAX);
163   convert_signed_char_to_unsigned_char((int8_t)UINT8_MAX);
164   convert_unsigned_char_to_signed_char((uint8_t)UINT8_MAX);
165   convert_signed_char_to_unsigned_int((int8_t)UINT8_MAX);
166   convert_unsigned_int_to_signed_char((uint32_t)UINT32_MAX);
167   convert_signed_int_to_signed_char((int32_t)(uint32_t)UINT32_MAX);
168 #elif defined(V1)
169    // Source 'Sign' bit set.
170   convert_unsigned_int_to_unsigned_int((uint32_t)INT32_MIN);
171   convert_unsigned_char_to_unsigned_char((uint8_t)INT8_MIN);
172   convert_signed_int_to_signed_int((int32_t)(uint32_t)INT32_MIN);
173   convert_signed_char_to_signed_char((int8_t)INT8_MIN);
174   convert_unsigned_int_to_unsigned_char((uint32_t)INT32_MIN);
175 // CHECK-V1: {{.*}}unsigned-integer-truncation.c:500:10: runtime error: implicit conversion from type 'unsigned int' of value 2147483648 (32-bit, unsigned) to type 'unsigned char' changed the value to 0 (8-bit, unsigned)
176   convert_unsigned_char_to_unsigned_int((uint8_t)INT8_MIN);
177   convert_unsigned_char_to_signed_int((uint8_t)INT8_MIN);
178   convert_signed_char_to_signed_int((int8_t)INT8_MIN);
179   convert_unsigned_int_to_signed_int((uint32_t)INT32_MIN);
180   convert_signed_int_to_unsigned_int((int32_t)(uint32_t)INT32_MIN);
181   convert_signed_int_to_unsigned_char((int32_t)(uint32_t)INT32_MIN);
182   convert_signed_char_to_unsigned_char((int8_t)INT8_MIN);
183   convert_unsigned_char_to_signed_char((uint8_t)INT8_MIN);
184   convert_signed_char_to_unsigned_int((int8_t)INT8_MIN);
185   convert_unsigned_int_to_signed_char((uint32_t)INT32_MIN);
186   convert_signed_int_to_signed_char((int32_t)(uint32_t)INT32_MIN);
187 #elif defined(V2)
188   // All bits except the source 'Sign' bit are set.
189   convert_unsigned_int_to_unsigned_int((uint32_t)INT32_MAX);
190   convert_unsigned_char_to_unsigned_char((uint8_t)INT8_MAX);
191   convert_signed_int_to_signed_int((int32_t)(uint32_t)INT32_MAX);
192   convert_signed_char_to_signed_char((int8_t)INT8_MAX);
193   convert_unsigned_int_to_unsigned_char((uint32_t)INT32_MAX);
194 // CHECK-V2: {{.*}}unsigned-integer-truncation.c:500:10: runtime error: implicit conversion from type 'unsigned int' of value 2147483647 (32-bit, unsigned) to type 'unsigned char' changed the value to 255 (8-bit, unsigned)
195   convert_unsigned_char_to_unsigned_int((uint8_t)INT8_MAX);
196   convert_unsigned_char_to_signed_int((uint8_t)INT8_MAX);
197   convert_signed_char_to_signed_int((int8_t)INT8_MAX);
198   convert_unsigned_int_to_signed_int((uint32_t)INT32_MAX);
199   convert_signed_int_to_unsigned_int((int32_t)(uint32_t)INT32_MAX);
200   convert_signed_int_to_unsigned_char((int32_t)(uint32_t)INT32_MAX);
201   convert_signed_char_to_unsigned_char((int8_t)INT8_MAX);
202   convert_unsigned_char_to_signed_char((uint8_t)INT8_MAX);
203   convert_signed_char_to_unsigned_int((int8_t)INT8_MAX);
204   convert_unsigned_int_to_signed_char((uint32_t)INT32_MAX);
205   convert_signed_int_to_signed_char((int32_t)(uint32_t)INT32_MAX);
206 #elif defined(V3)
207   // All destination bits set.
208   convert_unsigned_int_to_unsigned_int((uint32_t)UINT8_MAX);
209   convert_unsigned_char_to_unsigned_char((uint8_t)UINT8_MAX);
210   convert_signed_int_to_signed_int((int32_t)(uint32_t)UINT8_MAX);
211   convert_signed_char_to_signed_char((int8_t)UINT8_MAX);
212   convert_unsigned_int_to_unsigned_char((uint32_t)UINT8_MAX);
213   convert_unsigned_char_to_unsigned_int((uint8_t)UINT8_MAX);
214   convert_unsigned_char_to_signed_int((uint8_t)UINT8_MAX);
215   convert_signed_char_to_signed_int((int8_t)UINT8_MAX);
216   convert_unsigned_int_to_signed_int((uint32_t)UINT8_MAX);
217   convert_signed_int_to_unsigned_int((int32_t)(uint32_t)UINT8_MAX);
218   convert_signed_int_to_unsigned_char((int32_t)(uint32_t)UINT8_MAX);
219   convert_signed_char_to_unsigned_char((int8_t)UINT8_MAX);
220   convert_unsigned_char_to_signed_char((uint8_t)UINT8_MAX);
221   convert_signed_char_to_unsigned_int((int8_t)UINT8_MAX);
222   convert_unsigned_int_to_signed_char((uint32_t)UINT8_MAX);
223   convert_signed_int_to_signed_char((int32_t)(uint32_t)UINT8_MAX);
224 #elif defined(V4)
225   // Destination 'sign' bit set.
226   convert_unsigned_int_to_unsigned_int((uint32_t)(uint8_t)INT8_MIN);
227   convert_unsigned_char_to_unsigned_char((uint8_t)(uint8_t)INT8_MIN);
228   convert_signed_int_to_signed_int((int32_t)(uint32_t)(uint8_t)INT8_MIN);
229   convert_signed_char_to_signed_char((int8_t)(uint8_t)INT8_MIN);
230   convert_unsigned_int_to_unsigned_char((uint32_t)(uint8_t)INT8_MIN);
231   convert_unsigned_char_to_unsigned_int((uint8_t)(uint8_t)INT8_MIN);
232   convert_unsigned_char_to_signed_int((uint8_t)(uint8_t)INT8_MIN);
233   convert_signed_char_to_signed_int((int8_t)(uint8_t)INT8_MIN);
234   convert_unsigned_int_to_signed_int((uint32_t)(uint8_t)INT8_MIN);
235   convert_signed_int_to_unsigned_int((int32_t)(uint32_t)(uint8_t)INT8_MIN);
236   convert_signed_int_to_unsigned_char((int32_t)(uint32_t)(uint8_t)INT8_MIN);
237   convert_signed_char_to_unsigned_char((int8_t)(uint8_t)INT8_MIN);
238   convert_unsigned_char_to_signed_char((uint8_t)(uint8_t)INT8_MIN);
239   convert_signed_char_to_unsigned_int((int8_t)(uint8_t)INT8_MIN);
240   convert_unsigned_int_to_signed_char((uint32_t)(uint8_t)INT8_MIN);
241   convert_signed_int_to_signed_char((int32_t)(uint32_t)(uint8_t)INT8_MIN);
242 #elif defined(V5)
243   // All bits except the destination 'sign' bit are set.
244   convert_unsigned_int_to_unsigned_int((~((uint32_t)(uint8_t)INT8_MIN)));
245   convert_unsigned_char_to_unsigned_char((uint8_t)(uint8_t)INT8_MIN);
246   convert_signed_int_to_signed_int((int32_t)(~((uint32_t)(uint8_t)INT8_MIN)));
247   convert_signed_char_to_signed_char((int8_t)(uint8_t)INT8_MIN);
248   convert_unsigned_int_to_unsigned_char((~((uint32_t)(uint8_t)INT8_MIN)));
249 // CHECK-V5: {{.*}}unsigned-integer-truncation.c:500:10: runtime error: implicit conversion from type 'unsigned int' of value 4294967167 (32-bit, unsigned) to type 'unsigned char' changed the value to 127 (8-bit, unsigned)
250   convert_unsigned_char_to_unsigned_int((uint8_t)(uint8_t)INT8_MIN);
251   convert_unsigned_char_to_signed_int((uint8_t)(uint8_t)INT8_MIN);
252   convert_signed_char_to_signed_int((int8_t)(uint8_t)INT8_MIN);
253   convert_unsigned_int_to_signed_int((~((uint32_t)(uint8_t)INT8_MIN)));
254   convert_signed_int_to_unsigned_int((int32_t)(~((uint32_t)(uint8_t)INT8_MIN)));
255   convert_signed_int_to_unsigned_char((int32_t)(~((uint32_t)(uint8_t)INT8_MIN)));
256   convert_signed_char_to_unsigned_char((int8_t)(uint8_t)INT8_MIN);
257   convert_unsigned_char_to_signed_char((uint8_t)(uint8_t)INT8_MIN);
258   convert_signed_char_to_unsigned_int((int8_t)(uint8_t)INT8_MIN);
259   convert_unsigned_int_to_signed_char((~((uint32_t)(uint8_t)INT8_MIN)));
260   convert_signed_int_to_signed_char((int32_t)(~((uint32_t)(uint8_t)INT8_MIN)));
261 #elif defined(V6)
262   // Only the source and destination sign bits are set.
263   convert_unsigned_int_to_unsigned_int((uint32_t)INT32_MIN);
264   convert_unsigned_char_to_unsigned_char((uint8_t)INT8_MIN);
265   convert_signed_int_to_signed_int((int32_t)INT32_MIN);
266   convert_signed_char_to_signed_char((int8_t)INT8_MIN);
267   convert_unsigned_int_to_unsigned_char(((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN));
268 // CHECK-V6: {{.*}}unsigned-integer-truncation.c:500:10: runtime error: implicit conversion from type 'unsigned int' of value 2147483776 (32-bit, unsigned) to type 'unsigned char' changed the value to 128 (8-bit, unsigned)
269   convert_unsigned_char_to_unsigned_int((uint8_t)INT8_MIN);
270   convert_unsigned_char_to_signed_int((uint8_t)INT8_MIN);
271   convert_signed_char_to_signed_int((int8_t)INT8_MIN);
272   convert_unsigned_int_to_signed_int((uint32_t)INT32_MIN);
273   convert_signed_int_to_unsigned_int((uint32_t)INT32_MIN);
274   convert_signed_int_to_unsigned_char((int32_t)(((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN)));
275   convert_signed_char_to_unsigned_char((int8_t)INT8_MIN);
276   convert_unsigned_char_to_signed_char((uint8_t)INT8_MIN);
277   convert_signed_char_to_unsigned_int((int8_t)INT8_MIN);
278   convert_unsigned_int_to_signed_char((((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN)));
279   convert_signed_int_to_signed_char((int32_t)(((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN)));
280 #elif defined(V7)
281   // All bits except the source and destination sign bits are set.
282   convert_unsigned_int_to_unsigned_int((uint32_t)INT32_MAX);
283   convert_unsigned_char_to_unsigned_char((uint8_t)INT8_MAX);
284   convert_signed_int_to_signed_int((int32_t)INT32_MAX);
285   convert_signed_char_to_signed_char((int8_t)INT8_MAX);
286   convert_unsigned_int_to_unsigned_char(~(((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN)));
287 // CHECK-V7: {{.*}}unsigned-integer-truncation.c:500:10: runtime error: implicit conversion from type 'unsigned int' of value 2147483519 (32-bit, unsigned) to type 'unsigned char' changed the value to 127 (8-bit, unsigned)
288   convert_unsigned_char_to_unsigned_int((uint8_t)INT8_MAX);
289   convert_unsigned_char_to_signed_int((uint8_t)INT8_MAX);
290   convert_signed_char_to_signed_int((int8_t)INT8_MAX);
291   convert_unsigned_int_to_signed_int((uint32_t)INT32_MAX);
292   convert_signed_int_to_unsigned_int((uint32_t)INT32_MAX);
293   convert_signed_int_to_unsigned_char((int32_t)(~(((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN))));
294   convert_signed_char_to_unsigned_char((int8_t)INT8_MAX);
295   convert_unsigned_char_to_signed_char((uint8_t)INT8_MAX);
296   convert_signed_char_to_unsigned_int((int8_t)INT8_MAX);
297   convert_unsigned_int_to_signed_char(~(((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN)));
298   convert_signed_int_to_signed_char((int32_t)~(((uint32_t)INT32_MIN) | ((uint32_t)(uint8_t)INT8_MIN)));
299 #else
300 #error Some V* needs to be defined!
301 #endif
302 
303   return 0;
304 }
305