Skip to content

Partial fix for #14911 FN knownConditionTrueFalse for number literals (regression) #8737

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
chrchr-github wants to merge 5 commits into
base: main
Choose a base branch
from
+36 −5
Open

Partial fix for #14911 FN knownConditionTrueFalse for number literals (regression) #8737

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
0a03eb2
Partial fix for #14911
web-flow Jul 15, 2026
4b6396f
Merge branch 'main' into chr_14911
chrchr-github Jul 15, 2026
33988e1
Format
web-flow Jul 15, 2026
c0c6402
Update checkcondition.cpp [skip ci]
chrchr-github Jul 16, 2026
0736e65
Update testcondition.cpp
chrchr-github Jul 16, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 14 additions & 5 deletions lib/checkcondition.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1575,10 +1575,19 @@ void CheckConditionImpl::alwaysTrueFalse()
continue;
if (Token::simpleMatch(tok->astParent(), "return") && Token::Match(tok, ".|%var%"))
continue;
if (Token::Match(tok, "%num%|%bool%|%char%"))
continue;
if (Token::Match(tok, "! %num%|%bool%|%char%"))
continue;
bool warnForNumber = false;
if (Token::Match(tok, "%num%|%bool%|%char%")) {
const bool isZeroOrOne = (tok->getKnownIntValue() >> 1) == 0;
warnForNumber = !isZeroOrOne && tok->tokType() == Token::eNumber && tok->astParent() == condition->astParent();
if (!warnForNumber)
continue;
}
if (Token::Match(tok, "! %num%|%bool%|%char%")) {
const bool isZeroOrOne = tok->next()->hasKnownIntValue() && (tok->next()->getKnownIntValue() >> 1) == 0;
warnForNumber = !isZeroOrOne && tok->next()->tokType() == Token::eNumber && tok->astParent() == condition->astParent();
if (!warnForNumber)
continue;
}
if (Token::Match(tok, "%oror%|&&")) {
bool bail = false;
for (const Token* op : { tok->astOperand1(), tok->astOperand2() }) {
Expand All @@ -1603,7 +1612,7 @@ void CheckConditionImpl::alwaysTrueFalse()
true))
continue;

if (!pedantic && isConstVarExpression(tok, [](const Token* tok) {
if (!pedantic && !warnForNumber && isConstVarExpression(tok, [](const Token* tok) {
return Token::Match(tok, "[|(|&|+|-|*|/|%|^|>>|<<") && !Token::simpleMatch(tok, "( )");
}))
continue;
Expand Down
22 changes: 22 additions & 0 deletions test/testcondition.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4949,6 +4949,28 @@ class TestCondition : public TestFixture {
" return x ? false : true;\n"
"}\n");
ASSERT_EQUALS("", errout_str());

check("void f() {\n"
" if (42) {}\n"
" if (42U) {}\n"
" if (42L) {}\n"
" if (42UL) {}\n"
" if (42LL) {}\n"
" if (042) {}\n"
" if (0x42) {}\n"
" if (0b101010) {}\n"
" if (!42) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2:9]: (style) Condition '42' is always true [knownConditionTrueFalse]\n"
"[test.cpp:3:9]: (style) Condition '42U' is always true [knownConditionTrueFalse]\n"
"[test.cpp:4:9]: (style) Condition '42L' is always true [knownConditionTrueFalse]\n"
"[test.cpp:5:9]: (style) Condition '42UL' is always true [knownConditionTrueFalse]\n"
"[test.cpp:6:9]: (style) Condition '42LL' is always true [knownConditionTrueFalse]\n"
"[test.cpp:7:9]: (style) Condition '042' is always true [knownConditionTrueFalse]\n"
"[test.cpp:8:9]: (style) Condition '0x42' is always true [knownConditionTrueFalse]\n"
"[test.cpp:9:9]: (style) Condition '0b101010' is always true [knownConditionTrueFalse]\n"
"[test.cpp:10:9]: (style) Condition '!42' is always false [knownConditionTrueFalse]\n",
errout_str());
}

void alwaysTrueSymbolic()
Expand Down
Loading