piotrdz updated this revision to Diff 33879.
piotrdz added a comment.

In this third version I did the following:

- fixed problems which I noticed with template specializations,
- changed output diagnostics to be more detailed, covering multiple declarations
- added FixIt hints to refactor inconsistent declarations to parameter names we 
see in definition
- added new template-related testcases and extended existing ones with checking 
of note diagnostics and FixIt hints


http://reviews.llvm.org/D12462

Files:
  clang-tidy/readability/CMakeLists.txt
  clang-tidy/readability/InconsistentDeclarationParameterNameCheck.cpp
  clang-tidy/readability/InconsistentDeclarationParameterNameCheck.h
  clang-tidy/readability/ReadabilityTidyModule.cpp
  docs/clang-tidy/checks/list.rst
  docs/clang-tidy/checks/readability-inconsistent-declaration-parameter-name.rst
  test/clang-tidy/readability-inconsistent-declaration-parameter-name.cpp

Index: test/clang-tidy/readability-inconsistent-declaration-parameter-name.cpp
===================================================================
--- test/clang-tidy/readability-inconsistent-declaration-parameter-name.cpp
+++ test/clang-tidy/readability-inconsistent-declaration-parameter-name.cpp
@@ -0,0 +1,153 @@
+// RUN: %python %S/check_clang_tidy.py %s readability-inconsistent-declaration-parameter-name %t
+
+void consistentFunction(int a, int b, int c);
+void consistentFunction(int a, int b, int c);
+void consistentFunction(int a, int b, int /*c*/);
+void consistentFunction(int /*c*/, int /*c*/, int /*c*/);
+
+//////////////////////////////////////////////////////
+
+// CHECK-MESSAGES: :[[@LINE+1]]:6: warning: function 'inconsistentFunction' has 2 other declarations with differently named parameters [readability-inconsistent-declaration-parameter-name]
+void inconsistentFunction(int a, int b, int c);
+// CHECK-MESSAGES: :[[@LINE+4]]:6: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+3]]:31: note: parameter 1 is named 'd' here, but 'a' in compared declaration
+// CHECK-MESSAGES: :[[@LINE+2]]:38: note: parameter 2 is named 'e' here, but 'b' in compared declaration
+// CHECK-MESSAGES: :[[@LINE+1]]:45: note: parameter 3 is named 'f' here, but 'c' in compared declaration
+void inconsistentFunction(int d, int e, int f);
+// CHECK-MESSAGES: :[[@LINE+4]]:6: note: 2nd inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+3]]:31: note: parameter 1 is named 'x' here, but 'a' in compared declaration
+// CHECK-MESSAGES: :[[@LINE+2]]:38: note: parameter 2 is named 'y' here, but 'b' in compared declaration
+// CHECK-MESSAGES: :[[@LINE+1]]:45: note: parameter 3 is named 'z' here, but 'c' in compared declaration
+void inconsistentFunction(int x, int y, int z);
+
+//////////////////////////////////////////////////////
+
+// CHECK-MESSAGES: :[[@LINE+5]]:6: warning: function 'inconsistentFunctionWithVisibleDefinition' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE+3]]:6: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+2]]:52: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+// CHECK-FIXES: void inconsistentFunctionWithVisibleDefinition(int b);
+void inconsistentFunctionWithVisibleDefinition(int a);
+void inconsistentFunctionWithVisibleDefinition(int b) {}
+
+//////////////////////////////////////////////////////
+
+struct Struct {
+// CHECK-MESSAGES: :[[@LINE+7]]:14: warning:  function 'Struct::inconsistentFunction' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE+3]]:8: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+2]]:33: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+// CHECK-FIXES: void inconsistentFunction(int b);
+  void inconsistentFunction(int a);
+};
+
+void Struct::inconsistentFunction(int b) {}
+
+//////////////////////////////////////////////////////
+
+struct SpecialFunctions {
+// CHECK-MESSAGES: :[[@LINE+13]]:19: warning:  function 'SpecialFunctions::SpecialFunctions' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE+3]]:3: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+2]]:24: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+// CHECK-FIXES: SpecialFunctions(int b);
+  SpecialFunctions(int a);
+
+// CHECK-MESSAGES: :[[@LINE+9]]:37: warning:  function 'SpecialFunctions::operator=' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE+3]]:21: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+2]]:55: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+// CHECK-FIXES: SpecialFunctions& operator=(const SpecialFunctions& b);
+  SpecialFunctions& operator=(const SpecialFunctions& a);
+};
+
+SpecialFunctions::SpecialFunctions(int b) {}
+
+SpecialFunctions& SpecialFunctions::operator=(const SpecialFunctions& b) { return *this; }
+
+//////////////////////////////////////////////////////
+
+// CHECK-MESSAGES: :[[@LINE+8]]:6: warning:  function 'templateFunctionWithSeparateDeclarationAndDefinition' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE+4]]:6: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+3]]:61: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+// CHECK-FIXES: void templateFunctionWithSeparateDeclarationAndDefinition(T b);
+template<typename T>
+void templateFunctionWithSeparateDeclarationAndDefinition(T a);
+
+template<typename T>
+void templateFunctionWithSeparateDeclarationAndDefinition(T b) {}
+
+//////////////////////////////////////////////////////
+
+template<typename T>
+void templateFunctionWithSpecializations(T a) {}
+
+template<>
+// CHECK-MESSAGES: :[[@LINE+3]]:6: warning:  function 'templateFunctionWithSpecializations<int>' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE-4]]:6: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE-5]]:44: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+void templateFunctionWithSpecializations(int b) {}
+
+template<>
+// CHECK-MESSAGES: :[[@LINE+3]]:6: warning:  function 'templateFunctionWithSpecializations<float>' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE-10]]:6: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE-11]]:44: note: parameter 1 is named 'a' here, but 'c' in compared declaration
+void templateFunctionWithSpecializations(float c) {}
+
+//////////////////////////////////////////////////////
+
+template<typename T>
+class ClassTemplate
+{
+public:
+// CHECK-MESSAGES: :[[@LINE+8]]:24: warning:  function 'ClassTemplate::functionInClassTemplateWithSeparateDeclarationAndDefinition' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE+3]]:10: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+2]]:74: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+// CHECK-FIXES: void functionInClassTemplateWithSeparateDeclarationAndDefinition(int b);
+    void functionInClassTemplateWithSeparateDeclarationAndDefinition(int a);
+};
+
+template<typename T>
+void ClassTemplate<T>::functionInClassTemplateWithSeparateDeclarationAndDefinition(int b) {}
+
+//////////////////////////////////////////////////////
+
+class Class
+{
+public:
+    template<typename T>
+// CHECK-MESSAGES: :[[@LINE+13]]:13: warning:  function 'Class::memberFunctionTemplateWithSeparateDeclarationAndDefinition' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE+3]]:8: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+2]]:69: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+// CHECK-FIXES: void memberFunctionTemplateWithSeparateDeclarationAndDefinition(T b);
+  void memberFunctionTemplateWithSeparateDeclarationAndDefinition(T a);
+
+  template<typename T>
+  void memberFunctionTemplateWithSpecializations(T a) {}
+};
+
+//////////////////////////////////////////////////////
+
+template<typename T>
+void Class::memberFunctionTemplateWithSeparateDeclarationAndDefinition(T b) {}
+
+//////////////////////////////////////////////////////
+
+template<>
+// CHECK-MESSAGES: :[[@LINE+3]]:13: warning:  function 'Class::memberFunctionTemplateWithSpecializations<int>' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE-12]]:8: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE-13]]:52: note: parameter 1 is named 'a' here, but 'b' in compared declaration
+void Class::memberFunctionTemplateWithSpecializations(int b) {}
+
+template<>
+// CHECK-MESSAGES: :[[@LINE+3]]:13: warning:  function 'Class::memberFunctionTemplateWithSpecializations<float>' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+// CHECK-MESSAGES: :[[@LINE-18]]:8: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE-19]]:52: note: parameter 1 is named 'a' here, but 'c' in compared declaration
+void Class::memberFunctionTemplateWithSpecializations(float c) {}
+
+//////////////////////////////////////////////////////
+
+#define DECLARE_FUNCTION_WITH_PARAM_NAME(function_name, param_name) \
+  void function_name(int param_name)
+
+// CHECK-MESSAGES: :[[@LINE+1]]:34: warning:  function 'macroFunction' has 1 other declaration with differently named parameters [readability-inconsistent-declaration-parameter-name]
+DECLARE_FUNCTION_WITH_PARAM_NAME(macroFunction, a);
+// CHECK-MESSAGES: :[[@LINE+2]]:34: note: 1st inconsistent declaration seen here
+// CHECK-MESSAGES: :[[@LINE+1]]:49: note: parameter 1 is named 'b' here, but 'a' in compared declaration
+DECLARE_FUNCTION_WITH_PARAM_NAME(macroFunction, b);
Index: docs/clang-tidy/checks/readability-inconsistent-declaration-parameter-name.rst
===================================================================
--- docs/clang-tidy/checks/readability-inconsistent-declaration-parameter-name.rst
+++ docs/clang-tidy/checks/readability-inconsistent-declaration-parameter-name.rst
@@ -0,0 +1,29 @@
+readability-inconsistent-declaration-parameter-name
+===================================================
+
+
+Find function declarations which differ in parameter names.
+
+Example:
+
+.. code:: c++
+
+  // in foo.hpp:
+  void foo(int a, int b, int c);
+
+  // in foo.cpp:
+  void foo(int d, int e, int f); // warning
+
+This check should help to enforce consistency in large projects, where it often happens
+that a definition of function is refactored, changing the parameter names, but its declaration
+in header file is not updated. With this check, we can easily find and correct such inconsistencies,
+keeping declaration and definition always in sync.
+
+Unnamed parameters are allowed and are not taken into account when comparing function declarations, for example:
+
+.. code:: c++
+
+   void foo(int a);
+   void foo(int); // no warning
+
+If there are multiple declarations of same function, only one warning will be generated.
\ No newline at end of file
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -47,8 +47,9 @@
    readability-else-after-return
    readability-function-size
    readability-identifier-naming
+   readability-inconsistent-declaration-parameter-name
    readability-named-parameter
    readability-redundant-smartptr-get
    readability-redundant-string-cstr
    readability-shrink-to-fit
    readability-simplify-boolean-expr
\ No newline at end of file
Index: clang-tidy/readability/ReadabilityTidyModule.cpp
===================================================================
--- clang-tidy/readability/ReadabilityTidyModule.cpp
+++ clang-tidy/readability/ReadabilityTidyModule.cpp
@@ -15,6 +15,7 @@
 #include "ElseAfterReturnCheck.h"
 #include "FunctionSizeCheck.h"
 #include "IdentifierNamingCheck.h"
+#include "InconsistentDeclarationParameterNameCheck.h"
 #include "NamedParameterCheck.h"
 #include "RedundantSmartptrGetCheck.h"
 #include "RedundantStringCStrCheck.h"
@@ -38,6 +39,8 @@
         "readability-function-size");
     CheckFactories.registerCheck<IdentifierNamingCheck>(
         "readability-identifier-naming");
+    CheckFactories.registerCheck<InconsistentDeclarationParameterNameCheck>(
+        "readability-inconsistent-declaration-parameter-name");
     CheckFactories.registerCheck<readability::NamedParameterCheck>(
         "readability-named-parameter");
     CheckFactories.registerCheck<RedundantSmartptrGetCheck>(
Index: clang-tidy/readability/InconsistentDeclarationParameterNameCheck.h
===================================================================
--- clang-tidy/readability/InconsistentDeclarationParameterNameCheck.h
+++ clang-tidy/readability/InconsistentDeclarationParameterNameCheck.h
@@ -0,0 +1,46 @@
+//===--- InconsistentDeclarationParameterNameCheck.h -
+//clang-tidy-------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_INCONSISTENT_DECLARATION_PARAMETER_NAME_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_INCONSISTENT_DECLARATION_PARAMETER_NAME_H
+
+#include "../ClangTidy.h"
+
+#include "llvm/ADT/DenseSet.h"
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+/// \brief Checks for declarations of functions which differ in parameter names
+///
+/// Detailed documentation is provided in HTML files, see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/readability-inconsistent-declaration-parameter-name.html
+///
+class InconsistentDeclarationParameterNameCheck : public ClangTidyCheck {
+public:
+  InconsistentDeclarationParameterNameCheck(StringRef Name,
+                                            ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+private:
+  void markRedeclarationsAsVisited(const FunctionDecl *FunctionDeclaration);
+
+  llvm::DenseSet<const FunctionDecl *> VisitedDeclarations;
+};
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_INCONSISTENT_DECLARATION_PARAMETER_NAME_H
Index: clang-tidy/readability/InconsistentDeclarationParameterNameCheck.cpp
===================================================================
--- clang-tidy/readability/InconsistentDeclarationParameterNameCheck.cpp
+++ clang-tidy/readability/InconsistentDeclarationParameterNameCheck.cpp
@@ -0,0 +1,206 @@
+//===--- InconsistentDeclarationParameterNameCheck.cpp -
+//clang-tidy---------------------------===//
+//
+//           The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "InconsistentDeclarationParameterNameCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+#include <algorithm>
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+namespace {
+
+AST_MATCHER(FunctionDecl, hasOtherDeclarations) {
+  auto It = Node.redecls_begin();
+  auto EndIt = Node.redecls_end();
+
+  if (It == EndIt)
+    return false;
+
+  ++It;
+  return It != EndIt;
+}
+
+struct DifferingParamInfo {
+  DifferingParamInfo(int Number,
+                     llvm::StringRef MainName,
+                     llvm::StringRef OtherName,
+                     SourceRange OtherNameRange)
+      : Number(Number),
+        MainName(MainName),
+        OtherName(OtherName),
+        OtherNameRange(OtherNameRange) {}
+
+  int Number;
+  llvm::StringRef MainName;
+  llvm::StringRef OtherName;
+  SourceRange OtherNameRange;
+};
+
+using DifferingParamsContainer = llvm::SmallVector<DifferingParamInfo, 10>;
+
+struct InconsistentDeclarationInfo {
+  InconsistentDeclarationInfo(SourceLocation DeclarationLocation,
+                              bool IsTemplateSpecialization,
+                              DifferingParamsContainer&& DifferingParams)
+      : DeclarationLocation(DeclarationLocation),
+        IsTemplateSpecialization(IsTemplateSpecialization),
+        DifferingParams(std::move(DifferingParams)) {}
+
+  SourceLocation DeclarationLocation;
+  bool IsTemplateSpecialization;
+  DifferingParamsContainer DifferingParams;
+};
+
+using InconsistentDeclarationsContainer = llvm::SmallVector<InconsistentDeclarationInfo, 2>;
+
+InconsistentDeclarationsContainer
+findInconsitentDeclarations(const FunctionDecl *FunctionDeclaration, SourceManager& SM) {
+  InconsistentDeclarationsContainer InconsistentDeclarations;
+  for (const FunctionDecl *OtherDeclaration : FunctionDeclaration->redecls()) {
+    if (OtherDeclaration == FunctionDeclaration) // skip self
+      continue;
+
+    auto MainParamIt = FunctionDeclaration->param_begin();
+    auto OtherParamIt = OtherDeclaration->param_begin();
+    int Count = 1;
+    DifferingParamsContainer DifferingParams;
+
+    while (MainParamIt != FunctionDeclaration->param_end() &&
+           OtherParamIt != OtherDeclaration->param_end()) {
+      auto MainParamName = (*MainParamIt)->getName();
+      auto OtherParamName = (*OtherParamIt)->getName();
+
+      // FIXME: provide a way to extract commented out parameter name from comment
+      if (!MainParamName.empty() &&
+          !OtherParamName.empty() &&
+          MainParamName != OtherParamName) {
+        SourceRange OtherParamNameRange = DeclarationNameInfo((*OtherParamIt)->getDeclName(),
+                                                              (*OtherParamIt)->getLocation()).getSourceRange();
+        DifferingParams.emplace_back(Count, MainParamName, OtherParamName, OtherParamNameRange);
+      }
+
+      ++MainParamIt;
+      ++OtherParamIt;
+      ++Count;
+    }
+
+    if (!DifferingParams.empty()) {
+      bool IsTemplateSpecialization =
+        OtherDeclaration->getTemplatedKind() ==
+          FunctionDecl::TemplatedKind::TK_FunctionTemplateSpecialization;
+
+      SourceLocation OtherLocation;
+      if (IsTemplateSpecialization) {
+        // special case of template specializations
+        // what we actually see here is a generated declaration from the main template declaration
+        // but it's regular getLocation() method confusingly shows the location of this specialization, not main template
+        OtherLocation = OtherDeclaration->getPrimaryTemplate()->getLocation();
+      } else {
+        OtherLocation = OtherDeclaration->getLocation();
+      }
+
+      InconsistentDeclarations.emplace_back(OtherLocation, IsTemplateSpecialization, std::move(DifferingParams));
+    }
+  }
+
+  std::sort(InconsistentDeclarations.begin(), InconsistentDeclarations.end(),
+            [&SM](const InconsistentDeclarationInfo& Info1, const InconsistentDeclarationInfo& Info2)
+            {
+                return SM.isBeforeInTranslationUnit(Info1.DeclarationLocation, Info2.DeclarationLocation);
+            });
+  return InconsistentDeclarations;
+}
+
+const FunctionDecl* chooseDefinitionIfAvailable(const FunctionDecl* FunctionDeclaration) {
+  if (FunctionDeclaration->isThisDeclarationADefinition())
+    return FunctionDeclaration; // already a definition
+
+  for (const FunctionDecl *OtherDeclaration : FunctionDeclaration->redecls()) {
+    if (OtherDeclaration->isThisDeclarationADefinition()) {
+      return OtherDeclaration; // change to definition
+    }
+  }
+
+  return FunctionDeclaration; // no definition found, so return original declaration
+}
+
+} // anonymous namespace
+
+void InconsistentDeclarationParameterNameCheck::registerMatchers(
+    MatchFinder *Finder) {
+  Finder->addMatcher(functionDecl(unless(isImplicit()),
+                                  hasOtherDeclarations()).bind("functionDecl"),
+                     this);
+}
+
+void InconsistentDeclarationParameterNameCheck::check(
+    const MatchFinder::MatchResult &Result) {
+  const FunctionDecl *FunctionDeclaration =
+      Result.Nodes.getNodeAs<FunctionDecl>("functionDecl");
+  if (FunctionDeclaration == nullptr)
+    return;
+
+  if (VisitedDeclarations.count(FunctionDeclaration) > 0)
+    return; // avoid multiple warnings
+
+  FunctionDeclaration = chooseDefinitionIfAvailable(FunctionDeclaration);
+  bool HaveFunctionDefinition = FunctionDeclaration->isThisDeclarationADefinition();
+
+  InconsistentDeclarationsContainer InconsistentDeclarations =
+      findInconsitentDeclarations(FunctionDeclaration, *Result.SourceManager);
+  if (InconsistentDeclarations.empty()) {
+    markRedeclarationsAsVisited(FunctionDeclaration); // to avoid unnecessary further visits
+    return;
+  }
+
+  diag(FunctionDeclaration->getLocation(),
+       "function %q0 has %1 other declaration%s1 with differently named parameters")
+    << FunctionDeclaration << static_cast<int>(InconsistentDeclarations.size());
+
+  int Count = 1;
+  for (const InconsistentDeclarationInfo& InconsistentDeclaration : InconsistentDeclarations) {
+    diag(InconsistentDeclaration.DeclarationLocation, "%ordinal0 inconsistent declaration seen here",
+         DiagnosticIDs::Level::Note)
+      << Count;
+
+    for (const DifferingParamInfo &ParamInfo : InconsistentDeclaration.DifferingParams) {
+      auto ParamDiag = diag(ParamInfo.OtherNameRange.getBegin(),
+           "parameter %0 is named '%1' here, but '%2' in compared declaration",
+           DiagnosticIDs::Level::Note)
+        << ParamInfo.Number << ParamInfo.OtherName << ParamInfo.MainName;
+
+      if (HaveFunctionDefinition && !InconsistentDeclaration.IsTemplateSpecialization) {
+        ParamDiag << FixItHint::CreateReplacement(CharSourceRange::getTokenRange(ParamInfo.OtherNameRange),
+                                                  ParamInfo.MainName);
+      }
+      // TODO: decide what to do if we see only declarations and no definition
+    }
+
+    ++Count;
+  }
+
+  markRedeclarationsAsVisited(FunctionDeclaration);
+}
+
+void InconsistentDeclarationParameterNameCheck::markRedeclarationsAsVisited(const FunctionDecl *FunctionDeclaration) {
+  for (const FunctionDecl *Redecl : FunctionDeclaration->redecls()) {
+    VisitedDeclarations.insert(Redecl);
+  }
+}
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang
Index: clang-tidy/readability/CMakeLists.txt
===================================================================
--- clang-tidy/readability/CMakeLists.txt
+++ clang-tidy/readability/CMakeLists.txt
@@ -6,6 +6,7 @@
   ElseAfterReturnCheck.cpp
   FunctionSizeCheck.cpp
   IdentifierNamingCheck.cpp
+  InconsistentDeclarationParameterNameCheck.cpp
   NamedParameterCheck.cpp
   NamespaceCommentCheck.cpp
   ReadabilityTidyModule.cpp
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