[PATCH] D106431: [clang-tidy] Fix cppcoreguidelines-init-variables by removing the enum FixIt, and add support for initialization check of scoped enum.

[gehry via Phabricator via cfe-commits]

Sockke updated this revision to Diff 362291.
Sockke retitled this revision from "[clang-tidy] Fix cppcoreguidelines-init-variables with enum judgement" to "[clang-tidy] Fix cppcoreguidelines-init-variables by removing the enum FixIt, and add support for initialization check of scoped enum.".
Sockke edited the summary of this revision.
Sockke added a comment.

Update!


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106431/new/

https://reviews.llvm.org/D106431

Files:
  clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp
  clang-tools-extra/docs/ReleaseNotes.rst
  clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-init-variables.rst
  clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-init-variables.cpp


Index: clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-init-variables.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-init-variables.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-init-variables.cpp
@@ -92,3 +92,26 @@
   } catch (int X) {
   }
 }
+
+enum Color { Red, Green, Blue };
+
+enum Car { Benz, BMW = 20, Audi = BMW + 2 };
+
+enum Gender : char { Male, Female };
+
+enum class Direction { Up, Down, Left, Right };
+
+enum class Fruit : int { Apple, Orange };
+
+void uninitialized_enum() {
+  Color color;
+  // CHECK-MESSAGES: :[[@LINE-1]]:9: warning: variable 'color' is not initialized [cppcoreguidelines-init-variables]
+  Car car;
+  // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: variable 'car' is not initialized [cppcoreguidelines-init-variables]
+  Gender gender;
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: variable 'gender' is not initialized [cppcoreguidelines-init-variables]
+  Direction direction;
+  // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: variable 'direction' is not initialized [cppcoreguidelines-init-variables]
+  Fruit fruit;
+  // CHECK-MESSAGES: :[[@LINE-1]]:9: warning: variable 'fruit' is not initialized [cppcoreguidelines-init-variables]
+}
Index: clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-init-variables.rst
===================================================================
--- clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-init-variables.rst
+++ clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-init-variables.rst
@@ -37,6 +37,21 @@
      // Rest of the function.
    }
 
+It warns for the uninitialized enum case, but without a FixIt:
+
+.. code-block:: c++
+
+   enum A {A1, A2, A3};
+   enum A_c : char { A_c1, A_c2, A_c3 };
+   enum class B { B1, B2, B3 };
+   enum class B_i : int { B_i1, B_i2, B_i3 };
+   void function() {
+     A a;     // Warning: variable 'a' is not initialized
+     A_c a_c; // Warning: variable 'a_c' is not initialized
+     B b;     // Warning: variable 'b' is not initialized
+     B_i b_i; // Warning: variable 'b_i' is not initialized
+   }
+
 Options
 -------
 
Index: clang-tools-extra/docs/ReleaseNotes.rst
===================================================================
--- clang-tools-extra/docs/ReleaseNotes.rst
+++ clang-tools-extra/docs/ReleaseNotes.rst
@@ -149,6 +149,12 @@
   function or assignment to ``nullptr``.
   Added support for pointers to ``std::unique_ptr``.
 
+- Improved :doc:`cppcoreguidelines-init-variables<clang-tidy/checks/cppcoreguidelines-init-variables>` check.
+
+  Removed the FixIt related to enum in this check because the rule it checks will initialize the enum as an integer and cause an error.
+
+  ⁣Added support for initialization check of the scoped enum
+
 Removed checks
 ^^^^^^^^^^^^^^
 
Index: clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp
+++ clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp
@@ -81,6 +81,11 @@
   const char *InitializationString = nullptr;
   bool AddMathInclude = false;
 
+  if (TypePtr->isEnumeralType()) {
+    diag(MatchedDecl->getLocation(), "variable %0 is not initialized")
+        << MatchedDecl;
+    return;
+  }
   if (TypePtr->isIntegerType())
     InitializationString = " = 0";
   else if (TypePtr->isFloatingType()) {


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