[PATCH] D26207: [ClangTidy - performance-unnecessary-value-param] Only add "const" when current parameter is not already const qualified

[Felix Berger via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL286010: [ClangTidy - performance-unnecessary-value-param] Only add "const" when current… (authored by flx).

Changed prior to commit:
  https://reviews.llvm.org/D26207?vs=76877&id=76940#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D26207

Files:
  clang-tools-extra/trunk/clang-tidy/performance/UnnecessaryValueParamCheck.cpp
  clang-tools-extra/trunk/test/clang-tidy/performance-unnecessary-value-param.cpp


Index: clang-tools-extra/trunk/clang-tidy/performance/UnnecessaryValueParamCheck.cpp
===================================================================
--- clang-tools-extra/trunk/clang-tidy/performance/UnnecessaryValueParamCheck.cpp
+++ clang-tools-extra/trunk/clang-tidy/performance/UnnecessaryValueParamCheck.cpp
@@ -128,7 +128,10 @@
     const auto &CurrentParam = *FunctionDecl->getParamDecl(Index);
     Diag << utils::fixit::changeVarDeclToReference(CurrentParam,
                                                            *Result.Context);
-    if (!IsConstQualified)
+    // The parameter of each declaration needs to be checked individually as to
+    // whether it is const or not as constness can differ between definition and
+    // declaration.
+    if (!CurrentParam.getType().getCanonicalType().isConstQualified())
       Diag << utils::fixit::changeVarDeclToConst(CurrentParam);
   }
 }
Index: clang-tools-extra/trunk/test/clang-tidy/performance-unnecessary-value-param.cpp
===================================================================
--- clang-tools-extra/trunk/test/clang-tidy/performance-unnecessary-value-param.cpp
+++ clang-tools-extra/trunk/test/clang-tidy/performance-unnecessary-value-param.cpp
@@ -244,3 +244,19 @@
 void NegativeForIncompleteType(IncompleteType I) {
   // CHECK-MESSAGES: [[@LINE-1]]:47: error: variable has incomplete type 'IncompleteType' [clang-diagnostic-error]
 }
+
+// Case where parameter in declaration is already const-qualified but not in
+// implementation. Make sure a second 'const' is not added to the declaration.
+void PositiveConstDeclaration(const ExpensiveToCopyType A);
+// CHECK-FIXES: void PositiveConstDeclaration(const ExpensiveToCopyType& A);
+void PositiveConstDeclaration(ExpensiveToCopyType A) {
+  // CHECK-MESSAGES: [[@LINE-1]]:51: warning: the parameter 'A' is copied
+  // CHECK-FIXES: void PositiveConstDeclaration(const ExpensiveToCopyType& A) {
+}
+
+void PositiveNonConstDeclaration(ExpensiveToCopyType A);
+// CHECK-FIXES: void PositiveNonConstDeclaration(const ExpensiveToCopyType& A);
+void PositiveNonConstDeclaration(const ExpensiveToCopyType A) {
+  // CHECK-MESSAGES: [[@LINE-1]]:60: warning: the const qualified parameter 'A'
+  // CHECK-FIXES: void PositiveNonConstDeclaration(const ExpensiveToCopyType& A) {
+}


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