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C++: Demonstrate a FP due to GVN

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This commit is contained in:
Jonas Jensen
2019-05-28 14:40:30 +02:00
parent 2e7daf2308
commit 120df6054b
2 changed files with 11 additions and 0 deletions
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10
cpp/ql/test/query-tests/Likely Bugs/RedundantNullCheckSimple/RedundantNullCheckSimple.cpp
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@@ -100,3 +100,13 @@ void test_field_local(bool boolvar) {
}
}
}
struct S {
long **pplong;
void test_phi() {
while (*pplong != nullptr) { // GOOD [FALSE POSITIVE]
pplong++;
}
}
};

1
cpp/ql/test/query-tests/Likely Bugs/RedundantNullCheckSimple/RedundantNullCheckSimple.expected
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@@ -3,3 +3,4 @@
| RedundantNullCheckSimple.cpp:48:12:48:12 | Load: p | This null check is redundant because the value is $@ in any case | RedundantNullCheckSimple.cpp:51:10:51:11 | Load: * ... | dereferenced here |
| RedundantNullCheckSimple.cpp:79:7:79:9 | Load: * ... | This null check is redundant because the value is $@ in any case | RedundantNullCheckSimple.cpp:78:7:78:10 | Load: * ... | dereferenced here |
| RedundantNullCheckSimple.cpp:93:13:93:13 | Load: p | This null check is redundant because the value is $@ in any case | RedundantNullCheckSimple.cpp:92:13:92:18 | Load: * ... | dereferenced here |
| RedundantNullCheckSimple.cpp:108:12:108:18 | Load: * ... | This null check is redundant because the value is $@ in any case | RedundantNullCheckSimple.cpp:108:12:108:18 | Load: * ... | dereferenced here |