[llvm-bugs] [Bug 51316] New: False positive for clang static analyzer checker optin.cplusplus.UninitializedObject

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51316

            Bug ID: 51316
           Summary: False positive for clang static analyzer checker
                    optin.cplusplus.UninitializedObject
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: smallcsf at yandex.ru
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Checker  UninitializedObject is enable by default in clang-tidy and reports
some false positives. Tests case(UninitializedObjectChecker_false_positive.cpp)
:
-----------------------------------------

struct Operand_ {
  int e;
  int a[2];
};

class b : Operand_ {
public:
  b() : Operand_{ 1, { 2, 3 }} {}
};

void c() { b(); }

-----------------------------------------

It returns wrong warning:

-----------------------------------------
UninitializedObjectChecker_false_positive.cpp:9:17: warning: 1 uninitialized
field at the end of the constructor call [optin.cplusplus.UninitializedObject]
  b() : Operand_{ 1, { 2, 3 }} {}
                ^~~~~~~~~~~~~~
UninitializedObjectChecker_false_positive.cpp:3:7: note: uninitialized field
'this->Operand_::e'
  int e;
      ^
1 warning generated.
-----------------------------------------

Arguments for clang-12 or clangs-13 in trunk:

-----------------------------------------
clang-12 -c UninitializedObjectChecker_false_positive.cpp  -Xclang
-analyzer-checker=optin.cplusplus.UninitializedObject -Xclang -analyze

-----------------------------------------

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