[PATCH] D79494: [clang-tidy] Exclude function calls in std namespace for bugprone-argument-comment.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added a reviewer: gribozavr2.
Herald added a subscriber: xazax.hun.
Herald added a project: clang.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79494

Files:
  clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp
  clang-tools-extra/test/clang-tidy/checkers/bugprone-argument-comment.cpp


Index: clang-tools-extra/test/clang-tidy/checkers/bugprone-argument-comment.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/bugprone-argument-comment.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/bugprone-argument-comment.cpp
@@ -115,3 +115,22 @@
 // CHECK-NOTES: [[@LINE-3]]:13: note: 'xxx' declared here
 // CHECK-FIXES: void g() { f6(/*xxy=*/0, 0); }
 }
+
+
+namespace std {
+template <typename T>
+class vector {
+public:
+  void assign(int __n, const T &__val);
+};
+template<typename T>
+void swap(T& __a, T& __b);
+} // namespace std
+namespace ignore_std_functions {
+void test(int a, int b) {
+  std::vector<int> s;
+  // verify the check is not fired on std functions.
+  s.assign(1, /*value=*/2);
+  std::swap(a, /*num=*/b);
+}
+} // namespace ignore_std_functions
Index: clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp
+++ clang-tools-extra/clang-tidy/bugprone/ArgumentCommentCheck.cpp
@@ -19,6 +19,13 @@
 namespace clang {
 namespace tidy {
 namespace bugprone {
+namespace {
+AST_MATCHER(Decl, isFromStdNamespace) {
+  if (const auto *D = Node.getDeclContext()->getEnclosingNamespaceContext())
+    return D->isStdNamespace();
+  return false;
+}
+} // namespace
 
 ArgumentCommentCheck::ArgumentCommentCheck(StringRef Name,
                                            ClangTidyContext *Context)
@@ -54,10 +61,17 @@
                // don't check them against NewCallback's parameter names.
                // FIXME: Make this configurable.
                unless(hasDeclaration(functionDecl(
-                   hasAnyName("NewCallback", "NewPermanentCallback")))))
+                   hasAnyName("NewCallback", "NewPermanentCallback")))),
+               // Ignore function/method calls in namespace std, there are many
+               // leading underscores in parameter names (libstdc++), suggesting
+               // them does more harm than good.
+               unless(hasDeclaration((isFromStdNamespace()))))
+          .bind("expr"),
+      this);
+  Finder->addMatcher(
+      cxxConstructExpr(unless(hasDeclaration(isFromStdNamespace())))
           .bind("expr"),
       this);
-  Finder->addMatcher(cxxConstructExpr().bind("expr"), this);
 }
 
 static std::vector<std::pair<SourceLocation, StringRef>>


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