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//===--- UseTransparentFunctorsCheck.cpp - clang-tidy----------------------===//
//
// 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 "UseTransparentFunctorsCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace modernize {
UseTransparentFunctorsCheck::UseTransparentFunctorsCheck(
StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context), SafeMode(Options.get("SafeMode", 0)) {}
void UseTransparentFunctorsCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "SafeMode", SafeMode ? 1 : 0);
}
void UseTransparentFunctorsCheck::registerMatchers(MatchFinder *Finder) {
if (!getLangOpts().CPlusPlus14)
return;
const auto TransparentFunctors =
classTemplateSpecializationDecl(
unless(hasAnyTemplateArgument(refersToType(voidType()))),
hasAnyName("::std::plus", "::std::minus", "::std::multiplies",
"::std::divides", "::std::modulus", "::std::negate",
"::std::equal_to", "::std::not_equal_to", "::std::greater",
"::std::less", "::std::greater_equal", "::std::less_equal",
"::std::logical_and", "::std::logical_or",
"::std::logical_not", "::std::bit_and", "::std::bit_or",
"::std::bit_xor", "::std::bit_not"))
.bind("FunctorClass");
// Non-transparent functor mentioned as a template parameter. FIXIT.
Finder->addMatcher(
loc(qualType(
unless(elaboratedType()),
hasDeclaration(classTemplateSpecializationDecl(
unless(hasAnyTemplateArgument(templateArgument(refersToType(
qualType(pointsTo(qualType(isAnyCharacter()))))))),
hasAnyTemplateArgument(
templateArgument(refersToType(qualType(hasDeclaration(
TransparentFunctors))))
.bind("Functor"))))))
.bind("FunctorParentLoc"),
this);
if (SafeMode)
return;
// Non-transparent functor constructed. No FIXIT. There is no easy way
// to rule out the problematic char* vs string case.
Finder->addMatcher(cxxConstructExpr(hasDeclaration(cxxMethodDecl(
ofClass(TransparentFunctors))),
unless(isInTemplateInstantiation()))
.bind("FuncInst"),
this);
}
static const StringRef Message = "prefer transparent functors '%0'";
template <typename T> static T getInnerTypeLocAs(TypeLoc Loc) {
T Result;
while (Result.isNull() && !Loc.isNull()) {
Result = Loc.getAs<T>();
Loc = Loc.getNextTypeLoc();
}
return Result;
}
void UseTransparentFunctorsCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *FuncClass =
Result.Nodes.getNodeAs<ClassTemplateSpecializationDecl>("FunctorClass");
if (const auto *FuncInst =
Result.Nodes.getNodeAs<CXXConstructExpr>("FuncInst")) {
diag(FuncInst->getBeginLoc(), Message)
<< (FuncClass->getName() + "<>").str();
return;
}
const auto *Functor = Result.Nodes.getNodeAs<TemplateArgument>("Functor");
const auto FunctorParentLoc =
Result.Nodes.getNodeAs<TypeLoc>("FunctorParentLoc")
->getAs<TemplateSpecializationTypeLoc>();
if (!FunctorParentLoc)
return;
unsigned ArgNum = 0;
const auto *FunctorParentType =
FunctorParentLoc.getType()->castAs<TemplateSpecializationType>();
for (; ArgNum < FunctorParentType->getNumArgs(); ++ArgNum) {
const TemplateArgument &Arg = FunctorParentType->getArg(ArgNum);
if (Arg.getKind() != TemplateArgument::Type)
continue;
QualType ParentArgType = Arg.getAsType();
if (ParentArgType->isRecordType() &&
ParentArgType->getAsCXXRecordDecl() ==
Functor->getAsType()->getAsCXXRecordDecl())
break;
}
// Functor is a default template argument.
if (ArgNum == FunctorParentType->getNumArgs())
return;
TemplateArgumentLoc FunctorLoc = FunctorParentLoc.getArgLoc(ArgNum);
auto FunctorTypeLoc = getInnerTypeLocAs<TemplateSpecializationTypeLoc>(
FunctorLoc.getTypeSourceInfo()->getTypeLoc());
if (FunctorTypeLoc.isNull())
return;
SourceLocation ReportLoc = FunctorLoc.getLocation();
if (ReportLoc.isInvalid())
return;
diag(ReportLoc, Message) << (FuncClass->getName() + "<>").str()
<< FixItHint::CreateRemoval(
FunctorTypeLoc.getArgLoc(0).getSourceRange());
}
} // namespace modernize
} // namespace tidy
} // namespace clang
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