[PATCH] D157185: [clang-tidy] Fix false-positives in performanc-noexcept-swap

[Piotr Zegar via Phabricator via cfe-commits]

PiotrZSL updated this revision to Diff 547502.
PiotrZSL added a comment.

Rebase, add comments, make more strict for method (must be non-const)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157185/new/

https://reviews.llvm.org/D157185

Files:
  clang-tools-extra/clang-tidy/performance/NoexceptSwapCheck.cpp
  clang-tools-extra/docs/ReleaseNotes.rst
  clang-tools-extra/test/clang-tidy/checkers/performance/noexcept-swap.cpp


Index: clang-tools-extra/test/clang-tidy/checkers/performance/noexcept-swap.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/performance/noexcept-swap.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/performance/noexcept-swap.cpp
@@ -201,3 +201,17 @@
 template <typename T>
 void swap(OK21<T> &, OK21<T> &) noexcept(noexcept(TemplateNoexceptWithInt<int>::f()));
 void swap(OK21<int> &, OK21<int> &) noexcept(noexcept(TemplateNoexceptWithInt<int>::f()));
+
+namespace PR64303 {
+  void swap();
+  void swap(int&, bool&);
+  void swap(int&, int&, int&);
+  void swap(int&);
+
+  struct Test {
+    void swap();
+    void swap(Test&, Test&);
+    void swap(int&);
+    static void swap(int&, int&);
+  };
+}
Index: clang-tools-extra/docs/ReleaseNotes.rst
===================================================================
--- clang-tools-extra/docs/ReleaseNotes.rst
+++ clang-tools-extra/docs/ReleaseNotes.rst
@@ -172,6 +172,10 @@
   <clang-tidy/checks/llvm/namespace-comment>` check to provide fixes for
   ``inline`` namespaces in the same format as :program:`clang-format`.
 
+- Improved :doc:`performanc-noexcept-swap
+  <clang-tidy/checks/performance/noexcept-swap>` check to enforce a stricter
+  match with the swap function signature, eliminating false-positives.
+
 Removed checks
 ^^^^^^^^^^^^^^
 
Index: clang-tools-extra/clang-tidy/performance/NoexceptSwapCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/performance/NoexceptSwapCheck.cpp
+++ clang-tools-extra/clang-tidy/performance/NoexceptSwapCheck.cpp
@@ -17,9 +17,30 @@
 namespace clang::tidy::performance {
 
 void NoexceptSwapCheck::registerMatchers(MatchFinder *Finder) {
-  Finder->addMatcher(
-      functionDecl(unless(isDeleted()), hasName("swap")).bind(BindFuncDeclName),
-      this);
+
+  // Match non-const method with single argument that is non-const reference to
+  // a class type that owns method and return void void Class::swap(Class&)
+  auto MethodMatcher = cxxMethodDecl(
+      parameterCountIs(1U), unless(isConst()), returns(voidType()),
+      hasParameter(0, hasType(qualType(hasCanonicalType(
+                          qualType(unless(isConstQualified()),
+                                   references(namedDecl().bind("class"))))))),
+      ofClass(equalsBoundNode("class")));
+
+  // Match function with 2 arguments, both are non-const references to same type
+  // and return void void swap(Type&, Type&)
+  auto FunctionMatcher = allOf(
+      unless(cxxMethodDecl()), parameterCountIs(2U), returns(voidType()),
+      hasParameter(
+          0, hasType(qualType(hasCanonicalType(
+                 qualType(unless(isConstQualified()), references(qualType()))
+                     .bind("type"))))),
+      hasParameter(1, hasType(qualType(hasCanonicalType(
+                          qualType(equalsBoundNode("type")))))));
+  Finder->addMatcher(functionDecl(unless(isDeleted()), hasName("swap"),
+                                  anyOf(MethodMatcher, FunctionMatcher))
+                         .bind(BindFuncDeclName),
+                     this);
 }
 
 DiagnosticBuilder


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