--- /dev/null
+// RUN: %check_clang_tidy %s performance-unnecessary-value-param %t -- -- -fdelayed-template-parsing
+
+struct ExpensiveToCopyType {
+ const ExpensiveToCopyType & constReference() const {
+ return *this;
+ }
+ void nonConstMethod();
+ virtual ~ExpensiveToCopyType();
+};
+
+void mutate(ExpensiveToCopyType &);
+void mutate(ExpensiveToCopyType *);
+void useAsConstReference(const ExpensiveToCopyType &);
+void useByValue(ExpensiveToCopyType);
+
+// This class simulates std::pair<>. It is trivially copy constructible
+// and trivially destructible, but not trivially copy assignable.
+class SomewhatTrivial {
+ public:
+ SomewhatTrivial();
+ SomewhatTrivial(const SomewhatTrivial&) = default;
+ ~SomewhatTrivial() = default;
+ SomewhatTrivial& operator=(const SomewhatTrivial&);
+};
+
+void positiveExpensiveConstValue(const ExpensiveToCopyType Obj);
+// CHECK-FIXES: void positiveExpensiveConstValue(const ExpensiveToCopyType& Obj);
+void positiveExpensiveConstValue(const ExpensiveToCopyType Obj) {
+ // CHECK-MESSAGES: [[@LINE-1]]:60: warning: the const qualified parameter 'Obj' is copied for each invocation; consider making it a reference [performance-unnecessary-value-param]
+ // CHECK-FIXES: void positiveExpensiveConstValue(const ExpensiveToCopyType& Obj) {
+}
+
+void positiveExpensiveValue(ExpensiveToCopyType Obj);
+// CHECK-FIXES: void positiveExpensiveValue(const ExpensiveToCopyType& Obj);
+void positiveExpensiveValue(ExpensiveToCopyType Obj) {
+ // CHECK-MESSAGES: [[@LINE-1]]:49: warning: the parameter 'Obj' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param]
+ // CHECK-FIXES: void positiveExpensiveValue(const ExpensiveToCopyType& Obj) {
+ Obj.constReference();
+ useAsConstReference(Obj);
+ auto Copy = Obj;
+ useByValue(Obj);
+}
+
+void positiveWithComment(const ExpensiveToCopyType /* important */ S);
+// CHECK-FIXES: void positiveWithComment(const ExpensiveToCopyType& /* important */ S);
+void positiveWithComment(const ExpensiveToCopyType /* important */ S) {
+ // CHECK-MESSAGES: [[@LINE-1]]:68: warning: the const qualified
+ // CHECK-FIXES: void positiveWithComment(const ExpensiveToCopyType& /* important */ S) {
+}
+
+void positiveUnnamedParam(const ExpensiveToCopyType) {
+ // CHECK-MESSAGES: [[@LINE-1]]:52: warning: the const qualified parameter #1
+ // CHECK-FIXES: void positiveUnnamedParam(const ExpensiveToCopyType&) {
+}
+
+void positiveAndNegative(const ExpensiveToCopyType ConstCopy, const ExpensiveToCopyType& ConstRef, ExpensiveToCopyType Copy);
+// CHECK-FIXES: void positiveAndNegative(const ExpensiveToCopyType& ConstCopy, const ExpensiveToCopyType& ConstRef, const ExpensiveToCopyType& Copy);
+void positiveAndNegative(const ExpensiveToCopyType ConstCopy, const ExpensiveToCopyType& ConstRef, ExpensiveToCopyType Copy) {
+ // CHECK-MESSAGES: [[@LINE-1]]:52: warning: the const qualified parameter 'ConstCopy'
+ // CHECK-MESSAGES: [[@LINE-2]]:120: warning: the parameter 'Copy'
+ // CHECK-FIXES: void positiveAndNegative(const ExpensiveToCopyType& ConstCopy, const ExpensiveToCopyType& ConstRef, const ExpensiveToCopyType& Copy) {
+}
+
+struct PositiveConstValueConstructor {
+ PositiveConstValueConstructor(const ExpensiveToCopyType ConstCopy) {}
+ // CHECK-MESSAGES: [[@LINE-1]]:59: warning: the const qualified parameter 'ConstCopy'
+};
+
+template <typename T> void templateWithNonTemplatizedParameter(const ExpensiveToCopyType S, T V) {
+ // CHECK-MESSAGES: [[@LINE-1]]:90: warning: the const qualified parameter 'S'
+ // CHECK-FIXES: template <typename T> void templateWithNonTemplatizedParameter(const ExpensiveToCopyType& S, T V) {
+}
+
+void instantiated() {
+ templateWithNonTemplatizedParameter(ExpensiveToCopyType(), ExpensiveToCopyType());
+ templateWithNonTemplatizedParameter(ExpensiveToCopyType(), 5);
+}
+
+template <typename T> void negativeTemplateType(const T V) {
+}
+
+void negativeArray(const ExpensiveToCopyType[]) {
+}
+
+void negativePointer(ExpensiveToCopyType* Obj) {
+}
+
+void negativeConstPointer(const ExpensiveToCopyType* Obj) {
+}
+
+void negativeConstReference(const ExpensiveToCopyType& Obj) {
+}
+
+void negativeReference(ExpensiveToCopyType& Obj) {
+}
+
+void negativeUniversalReference(ExpensiveToCopyType&& Obj) {
+}
+
+void negativeSomewhatTrivialConstValue(const SomewhatTrivial Somewhat) {
+}
+
+void negativeSomewhatTrivialValue(SomewhatTrivial Somewhat) {
+}
+
+void negativeConstBuiltIn(const int I) {
+}
+
+void negativeValueBuiltIn(int I) {
+}
+
+void negativeValueIsMutatedByReference(ExpensiveToCopyType Obj) {
+ mutate(Obj);
+}
+
+void negativeValueIsMutatatedByPointer(ExpensiveToCopyType Obj) {
+ mutate(&Obj);
+}
+
+void negativeValueIsReassigned(ExpensiveToCopyType Obj) {
+ Obj = ExpensiveToCopyType();
+}
+
+void negativeValueNonConstMethodIsCalled(ExpensiveToCopyType Obj) {
+ Obj.nonConstMethod();
+}
+
+struct NegativeValueCopyConstructor {
+ NegativeValueCopyConstructor(ExpensiveToCopyType Copy) {}
+};
+
+template <typename T>
+struct Container {
+ typedef const T & const_reference;
+};
+
+void NegativeTypedefParam(const Container<ExpensiveToCopyType>::const_reference Param) {
+}
+
+#define UNNECESSARY_VALUE_PARAM_IN_MACRO_BODY() \
+ void inMacro(const ExpensiveToCopyType T) { \
+ } \
+// Ensure fix is not applied.
+// CHECK-FIXES: void inMacro(const ExpensiveToCopyType T) {
+
+UNNECESSARY_VALUE_PARAM_IN_MACRO_BODY()
+// CHECK-MESSAGES: [[@LINE-1]]:1: warning: the const qualified parameter 'T'
+
+#define UNNECESSARY_VALUE_PARAM_IN_MACRO_ARGUMENT(ARGUMENT) \
+ ARGUMENT
+
+UNNECESSARY_VALUE_PARAM_IN_MACRO_ARGUMENT(void inMacroArgument(const ExpensiveToCopyType InMacroArg) {})
+// CHECK-MESSAGES: [[@LINE-1]]:90: warning: the const qualified parameter 'InMacroArg'
+// CHECK-FIXES: void inMacroArgument(const ExpensiveToCopyType InMacroArg) {}
+
+struct VirtualMethod {
+ virtual ~VirtualMethod() {}
+ virtual void handle(ExpensiveToCopyType T) const = 0;
+};
+
+struct NegativeOverriddenMethod : public VirtualMethod {
+ void handle(ExpensiveToCopyType Overridden) const {
+ // CHECK-FIXES: handle(ExpensiveToCopyType Overridden) const {
+ }
+};
+
+struct NegativeDeletedMethod {
+ ~NegativeDeletedMethod() {}
+ NegativeDeletedMethod& operator=(NegativeDeletedMethod N) = delete;
+ // CHECK-FIXES: NegativeDeletedMethod& operator=(NegativeDeletedMethod N) = delete;
+};