[clang-tools-extra] [clang-tidy] Add misc-shadowed-namespace-function check (PR #168406)

[Yanzuo Liu via cfe-commits]

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@@ -0,0 +1,124 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "ShadowedNamespaceFunctionCheck.h"
+#include "../utils/FixItHintUtils.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "llvm/ADT/STLExtras.h"
+
+using namespace clang;
+using namespace clang::ast_matchers;
+using namespace clang::tidy;
+
+namespace clang::tidy::misc {
+
+static bool hasSameParameters(const FunctionDecl *Func1,
+                              const FunctionDecl *Func2) {
+  if (Func1->param_size() != Func2->param_size())
+    return false;
+
+  return llvm::all_of_zip(
+      Func1->parameters(), Func2->parameters(),
+      [](const ParmVarDecl *Param1, const ParmVarDecl *Param2) {
+        return Param1->getType().getCanonicalType() ==
+               Param2->getType().getCanonicalType();
+      });
+}
+
+static std::pair<const FunctionDecl *, const NamespaceDecl *>
+findShadowedInNamespace(const NamespaceDecl *NS, const FunctionDecl *GlobalFunc,
+                        const std::string &GlobalFuncName) {
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zwuis wrote:

`StringRef`

https://github.com/llvm/llvm-project/pull/168406