10 #include "clang/AST/ASTContext.h" 11 #include "clang/ASTMatchers/ASTMatchFinder.h" 23 auto CheckTemplate = [](
const TemplateSpecializationType *Spec) {
24 if (!Spec || !Spec->getTemplateName().getAsTemplateDecl()) {
27 const NamedDecl *TypeDecl =
28 Spec->getTemplateName().getAsTemplateDecl()->getTemplatedDecl();
29 return TypeDecl->isInStdNamespace() &&
30 (TypeDecl->getName().equals(
"enable_if") ||
31 TypeDecl->getName().equals(
"enable_if_t"));
33 const Type *BaseType = Node.getTypePtr();
35 while (BaseType->isPointerType() || BaseType->isReferenceType()) {
36 BaseType = BaseType->getPointeeType().getTypePtr();
39 if (
const auto *Dependent = BaseType->getAs<DependentNameType>()) {
40 BaseType = Dependent->getQualifier()->getAsType();
44 if (CheckTemplate(BaseType->getAs<TemplateSpecializationType>())) {
46 }
else if (
const auto *Elaborated = BaseType->getAs<ElaboratedType>()) {
47 if (
const auto *Qualifier = Elaborated->getQualifier()->getAsType()) {
48 if (CheckTemplate(Qualifier->getAs<TemplateSpecializationType>())) {
56 clang::ast_matchers::internal::Matcher<QualType>, TypeMatcher) {
57 return Node.hasDefaultArgument() &&
58 TypeMatcher.matches(Node.getDefaultArgument(), Finder,
Builder);
62 void ForwardingReferenceOverloadCheck::registerMatchers(MatchFinder *Finder) {
64 if (!getLangOpts().CPlusPlus11)
67 auto ForwardingRefParm =
69 hasType(qualType(rValueReferenceType(),
70 references(templateTypeParmType(hasDeclaration(
71 templateTypeParmDecl().bind(
"type-parm-decl")))),
72 unless(references(isConstQualified())))))
75 DeclarationMatcher findOverload =
77 hasParameter(0, ForwardingRefParm),
78 unless(hasAnyParameter(
80 parmVarDecl(hasType(isEnableIf())))),
81 unless(hasParent(functionTemplateDecl(has(templateTypeParmDecl(
83 hasDefaultArgument(isEnableIf())))))))
85 Finder->addMatcher(findOverload,
this);
88 void ForwardingReferenceOverloadCheck::check(
89 const MatchFinder::MatchResult &
Result) {
90 const auto *ParmVar = Result.Nodes.getNodeAs<ParmVarDecl>(
"parm-var");
91 const auto *TypeParmDecl =
92 Result.Nodes.getNodeAs<TemplateTypeParmDecl>(
"type-parm-decl");
96 const auto *FuncForParam = dyn_cast<FunctionDecl>(ParmVar->getDeclContext());
99 const FunctionTemplateDecl *FuncTemplate =
100 FuncForParam->getDescribedFunctionTemplate();
107 const TemplateParameterList *Params = FuncTemplate->getTemplateParameters();
108 if (!llvm::is_contained(*Params, TypeParmDecl))
112 const auto *Ctor = Result.Nodes.getNodeAs<CXXConstructorDecl>(
"ctor");
113 for (
auto Iter = Ctor->param_begin() + 1; Iter != Ctor->param_end(); ++Iter) {
114 if (!(*Iter)->hasDefaultArg())
117 bool EnabledCopy =
false, DisabledCopy =
false, EnabledMove =
false,
118 DisabledMove =
false;
119 for (
const auto *OtherCtor : Ctor->getParent()->ctors()) {
120 if (OtherCtor->isCopyOrMoveConstructor()) {
121 if (OtherCtor->isDeleted() || OtherCtor->getAccess() == AS_private)
122 (OtherCtor->isCopyConstructor() ? DisabledCopy : DisabledMove) =
true;
124 (OtherCtor->isCopyConstructor() ? EnabledCopy : EnabledMove) =
true;
127 bool Copy = (!EnabledMove && !DisabledMove && !DisabledCopy) || EnabledCopy;
128 bool Move = !DisabledMove || EnabledMove;
131 diag(Ctor->getLocation(),
132 "constructor accepting a forwarding reference can " 133 "hide the %select{copy|move|copy and move}0 constructor%s1")
134 << (Copy && Move ? 2 : (Copy ? 0 : 1)) << Copy + Move;
135 for (
const auto *OtherCtor : Ctor->getParent()->ctors()) {
136 if (OtherCtor->isCopyOrMoveConstructor() && !OtherCtor->isDeleted() &&
137 OtherCtor->getAccess() != AS_private) {
138 diag(OtherCtor->getLocation(),
139 "%select{copy|move}0 constructor declared here", DiagnosticIDs::Note)
140 << OtherCtor->isMoveConstructor();
AST_MATCHER(Expr, isMacroID)
CodeCompletionBuilder Builder
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
AST_MATCHER_P(CXXMethodDecl, hasCanonicalDecl, ast_matchers::internal::Matcher< CXXMethodDecl >, InnerMatcher)