| 1 | // RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.core -analyzer-store=region -verify -fblocks %s |
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| 2 | |
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| 3 | // <rdar://problem/6776949> |
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| 4 | // main's 'argc' argument is always > 0 |
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| 5 | int main(int argc, char* argv[]) { |
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| 6 | int *p = 0; |
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| 7 | |
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| 8 | if (argc == 0) |
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| 9 | *p = 1; |
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| 10 | |
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| 11 | if (argc == 1) |
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| 12 | return 1; |
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| 13 | |
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| 14 | int x = 1; |
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| 15 | int i; |
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| 16 | |
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| 17 | for(i=1;i<argc;i++){ |
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| 18 | p = &x; |
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| 19 | } |
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| 20 | |
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| 21 | return *p; // no-warning |
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| 22 | } |
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| 23 | |
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| 24 | // PR 5969: the comparison of argc < 3 || argc > 4 should constraint the switch |
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| 25 | // statement from having the 'default' branch taken. This previously reported a false |
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| 26 | // positive with the use of 'v'. |
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| 27 | |
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| 28 | int pr5969(int argc, char *argv[]) { |
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| 29 | |
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| 30 | int v; |
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| 31 | |
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| 32 | if ((argc < 3) || (argc > 4)) return 0; |
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| 33 | |
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| 34 | switch(argc) { |
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| 35 | case 3: |
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| 36 | v = 33; |
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| 37 | break; |
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| 38 | case 4: |
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| 39 | v = 44; |
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| 40 | break; |
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| 41 | } |
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| 42 | |
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| 43 | return v; // no-warning |
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| 44 | } |
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| 45 | |
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| 46 | int pr5969_positive(int argc, char *argv[]) { |
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| 47 | |
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| 48 | int v; |
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| 49 | |
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| 50 | if ((argc < 3) || (argc > 4)) return 0; |
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| 51 | |
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| 52 | switch(argc) { |
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| 53 | case 3: |
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| 54 | v = 33; |
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| 55 | break; |
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| 56 | } |
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| 57 | |
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| 58 | return v; // expected-warning{{Undefined or garbage value returned to caller}} |
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| 59 | } |
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| 60 | |
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