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111
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1 /* PR c/78284 - warn on malloc with very large arguments
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2 Test to exercise the interaction of the -Walloca-larger-than,
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3 -Wvla-larger-than, and -Walloc-size-larger-than options. The former
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4 two more specific options override the more general latter option. */
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5 /* { dg-do compile } */
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6 /* { dg-require-effective-target alloca } */
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7 /* { dg-options "-O2 -Walloc-size-larger-than=123 -Walloca-larger-than=234 -Wvla-larger-than=345" } */
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8
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9 typedef __SIZE_TYPE__ size_t;
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10
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11 void sink (void*);
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12
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131
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13 static size_t alloc_size_limit (void)
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111
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14 {
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15 return 123;
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16 }
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17
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131
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18 static size_t alloca_limit (void)
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111
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19 {
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20 return 234;
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21 }
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22
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131
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23 static size_t vla_limit (void)
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111
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24 {
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25 return 345;
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26 }
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27
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28 void test_alloca (void)
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29 {
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30 void *p;
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31
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32 /* No warning should be issued for the following call because the more
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33 permissive alloca limit overrides the stricter alloc_size limit. */
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34 p = __builtin_alloca (alloca_limit ());
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35 sink (p);
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36
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37 p = __builtin_alloca (alloca_limit () + 1); /* { dg-warning "argument to .alloca. is too large" } */
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38 sink (p);
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39 }
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40
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41 void test_vla (void)
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42 {
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43 /* Same as above, no warning should be issued here because the more
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44 permissive VLA limit overrides the stricter alloc_size limit. */
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45 char vla1 [vla_limit ()];
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46 sink (vla1);
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47
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48 char vla2 [vla_limit () + 1]; /* { dg-warning "argument to variable-length array is too large" } */
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49 sink (vla2);
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50 }
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51
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52 void test_malloc (void)
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53 {
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54 void *p;
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55 p = __builtin_malloc (alloc_size_limit ());
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56 sink (p);
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57
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58 p = __builtin_malloc (alloc_size_limit () + 1); /* { dg-warning "argument 1 value .124\[lu\]*. exceeds maximum object size 123" } */
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59 sink (p);
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60 }
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