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C++: Demonstrate false positives when a const variable is initialized in a parameter list

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This commit is contained in:
Mathias Vorreiter Pedersen
2020-03-13 17:00:54 +01:00
parent 9fc75f1f92
commit cc25298f67
2 changed files with 32 additions and 0 deletions
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29
cpp/ql/test/query-tests/Likely Bugs/Arithmetic/PointlessComparison/PointlessComparison.cpp Normal file
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@@ -0,0 +1,29 @@
void func_with_default_arg(const int n = 0) {
if(n <= 10) {} // GOOD [FALSE POSITIVE]
}
struct A {
const int int_member = 0;
A(int n) : int_member(n) {
if(int_member <= 10) {
}
}
};
struct B {
B(const int n = 0) {
if(n <= 10) {} // GOOD [FALSE POSITIVE]
}
};
const volatile int volatile_const_global = 0;
void test1() {
func_with_default_arg(100);
A a(100);
if(a.int_member <= 10) {}
if(volatile_const_global <= 10) {} // GOOD [FALSE POSITIVE]
}

3
cpp/ql/test/query-tests/Likely Bugs/Arithmetic/PointlessComparison/PointlessComparison.expected
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@@ -38,5 +38,8 @@
| PointlessComparison.c:303:9:303:14 | ... >= ... | Comparison is always false because c <= 0. |
| PointlessComparison.c:312:9:312:14 | ... >= ... | Comparison is always false because c <= 0. |
| PointlessComparison.c:337:14:337:21 | ... >= ... | Comparison is always true because x >= 0. |
| PointlessComparison.cpp:2:8:2:14 | ... <= ... | Comparison is always true because n <= 0. |
| PointlessComparison.cpp:16:12:16:18 | ... <= ... | Comparison is always true because n <= 0. |
| PointlessComparison.cpp:28:8:28:34 | ... <= ... | Comparison is always true because volatile_const_global <= 0. |
| RegressionTests.cpp:57:7:57:22 | ... <= ... | Comparison is always true because * ... <= 4294967295. |
| Templates.cpp:9:10:9:24 | ... <= ... | Comparison is always true because local <= 32767. |