Skip to content

Report overlappingInnerCondition errors #8448

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

Merged
danmar merged 2 commits into from
Apr 24, 2026
+39 −2
Merged

Report overlappingInnerCondition errors #8448

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
37deb79
Report overlapping inner conditions as identicalInnerCondition
francois-berder Apr 1, 2026
8dad4aa
fixup! Report overlapping inner conditions as identicalInnerCondition
francois-berder Apr 17, 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
4 changes: 3 additions & 1 deletion lib/checkcondition.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -602,7 +602,7 @@ void CheckCondition::oppositeElseIfConditionError(const Token *ifCond, const Tok

//---------------------------------------------------------------------------
// - Opposite inner conditions => always false
// - (TODO) Same/Overlapping inner condition => always true
// - Same/Overlapping inner condition => always true
// - same condition after early exit => always false
//---------------------------------------------------------------------------

Expand Down Expand Up @@ -759,6 +759,8 @@ void CheckCondition::multiCondition2()
oppositeInnerConditionError(firstCondition, cond2, errorPath);
} else if (!isReturnVar && isSameExpression(true, firstCondition, cond2, *mSettings, true, true, &errorPath)) {
identicalInnerConditionError(firstCondition, cond2, errorPath);
} else if (!isReturnVar && isOverlappingCond(cond2, firstCondition, true)) {
identicalInnerConditionError(firstCondition, cond2, errorPath);
}
}
return ChildrenToVisit::none;
Expand Down
2 changes: 1 addition & 1 deletion lib/checkcondition.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -84,7 +84,7 @@ class CPPCHECKLIB CheckCondition : public Check {
/**
* multiconditions #2
* - Opposite inner conditions => always false
* - (TODO) Same/Overlapping inner condition => always true
* - Same/Overlapping inner condition => always true
* - same condition after early exit => always false
**/
void multiCondition2();
Expand Down
14 changes: 14 additions & 0 deletions test/testcondition.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2834,6 +2834,20 @@ class TestCondition : public TestFixture {
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2:12] -> [test.cpp:4:13]: (warning) Identical inner 'if' condition is always true. [identicalInnerCondition]\n", errout_str());

check("void f(int x) {\n"
" if (x == 1) {\n"
" if (x & 7) {}\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2:11] -> [test.cpp:3:15]: (warning) Identical inner 'if' condition is always true. [identicalInnerCondition]\n", errout_str());
Comment thread
danmar marked this conversation as resolved.
Outdated

check("void f(int x) {\n"
" if (x & 7) {\n"
" if (x == 1) {}\n"
" }\n"
"}");
ASSERT_EQUALS("", errout_str());
}

void identicalConditionAfterEarlyExit() {
Expand Down
Loading