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//===--- IncorrectEnableIfCheck.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 "IncorrectEnableIfCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::bugprone {
namespace {
AST_MATCHER_P(TemplateTypeParmDecl, hasUnnamedDefaultArgument,
ast_matchers::internal::Matcher<TypeLoc>, InnerMatcher) {
if (Node.getIdentifier() != nullptr || !Node.hasDefaultArgument() ||
Node.getDefaultArgument().getArgument().isNull())
return false;
TypeLoc DefaultArgTypeLoc =
Node.getDefaultArgument().getTypeSourceInfo()->getTypeLoc();
return InnerMatcher.matches(DefaultArgTypeLoc, Finder, Builder);
}
} // namespace
void IncorrectEnableIfCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
templateTypeParmDecl(
hasUnnamedDefaultArgument(
elaboratedTypeLoc(
hasNamedTypeLoc(templateSpecializationTypeLoc(
loc(qualType(hasDeclaration(namedDecl(
hasName("::std::enable_if"))))))
.bind("enable_if_specialization")))
.bind("elaborated")))
.bind("enable_if"),
this);
}
void IncorrectEnableIfCheck::check(const MatchFinder::MatchResult &Result) {
const auto *EnableIf =
Result.Nodes.getNodeAs<TemplateTypeParmDecl>("enable_if");
const auto *ElaboratedLoc =
Result.Nodes.getNodeAs<ElaboratedTypeLoc>("elaborated");
const auto *EnableIfSpecializationLoc =
Result.Nodes.getNodeAs<TemplateSpecializationTypeLoc>(
"enable_if_specialization");
if (!EnableIf || !ElaboratedLoc || !EnableIfSpecializationLoc)
return;
const SourceManager &SM = *Result.SourceManager;
SourceLocation RAngleLoc =
SM.getExpansionLoc(EnableIfSpecializationLoc->getRAngleLoc());
auto Diag = diag(EnableIf->getBeginLoc(),
"incorrect std::enable_if usage detected; use "
"'typename std::enable_if<...>::type'");
if (!getLangOpts().CPlusPlus20) {
Diag << FixItHint::CreateInsertion(ElaboratedLoc->getBeginLoc(),
"typename ");
}
Diag << FixItHint::CreateInsertion(RAngleLoc.getLocWithOffset(1), "::type");
}
} // namespace clang::tidy::bugprone
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