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Fix #14392 FN knownConditionTrueFalse (assigning function call result) #8118

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Merged
chrchr-github merged 8 commits into from
Jan 29, 2026
Merged

Fix #14392 FN knownConditionTrueFalse (assigning function call result) #8118

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e93fb9c
Update checkcondition.cpp
chrchr-github Jan 13, 2026
0faaf14
Update testcondition.cpp
chrchr-github Jan 13, 2026
8dc1bd6
Update checkcondition.cpp
chrchr-github Jan 13, 2026
5a1aa4f
Update .selfcheck_suppressions
chrchr-github Jan 13, 2026
e5f529a
Update checkcondition.cpp
chrchr-github Jan 15, 2026
48b66db
Update testcondition.cpp
chrchr-github Jan 15, 2026
73a4900
Update checkcondition.cpp
chrchr-github Jan 15, 2026
4551f97
Update testcondition.cpp
chrchr-github Jan 15, 2026
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2 changes: 2 additions & 0 deletions lib/checkcondition.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1545,6 +1545,8 @@ void CheckCondition::alwaysTrueFalse()
condition = parent->astParent()->astParent()->previous();
else if (Token::Match(tok, "%comp%"))
condition = tok;
else if (tok->str() == "(" && astIsBool(parent) && Token::Match(parent, "%assign%"))
condition = tok;
else
continue;
}
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13 changes: 13 additions & 0 deletions test/testcondition.cpp
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Expand Up @@ -4787,6 +4787,19 @@ class TestCondition : public TestFixture {
" }\n"
"}\n");
ASSERT_EQUALS("", errout_str());

check("struct S {\n" // #14392
" bool g() const { return m; }\n"
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chrchr-github marked this conversation as resolved.
" bool m{};\n"
"};\n"
"void f(S s) {\n"
" if (s.g()) {\n"
" bool b = s.g();\n"
" return b;\n"
" }\n"
" return false;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6:12] -> [test.cpp:7:21]: (style) Condition 's.g()' is always true [knownConditionTrueFalse]\n", errout_str());
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}

void alwaysTrueSymbolic()
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