72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
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//===--- IncorrectEnableIfCheck.cpp - clang-tidy --------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "IncorrectEnableIfCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang::tidy::bugprone {
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namespace {
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AST_MATCHER_P(TemplateTypeParmDecl, hasUnnamedDefaultArgument,
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ast_matchers::internal::Matcher<TypeLoc>, InnerMatcher) {
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if (Node.getIdentifier() != nullptr || !Node.hasDefaultArgument() ||
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Node.getDefaultArgumentInfo() == nullptr)
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return false;
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TypeLoc DefaultArgTypeLoc = Node.getDefaultArgumentInfo()->getTypeLoc();
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return InnerMatcher.matches(DefaultArgTypeLoc, Finder, Builder);
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}
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} // namespace
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void IncorrectEnableIfCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(
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templateTypeParmDecl(
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hasUnnamedDefaultArgument(
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elaboratedTypeLoc(
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hasNamedTypeLoc(templateSpecializationTypeLoc(
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loc(qualType(hasDeclaration(namedDecl(
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hasName("::std::enable_if"))))))
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.bind("enable_if_specialization")))
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.bind("elaborated")))
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.bind("enable_if"),
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this);
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}
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void IncorrectEnableIfCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *EnableIf =
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Result.Nodes.getNodeAs<TemplateTypeParmDecl>("enable_if");
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const auto *ElaboratedLoc =
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Result.Nodes.getNodeAs<ElaboratedTypeLoc>("elaborated");
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const auto *EnableIfSpecializationLoc =
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Result.Nodes.getNodeAs<TemplateSpecializationTypeLoc>(
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"enable_if_specialization");
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if (!EnableIf || !ElaboratedLoc || !EnableIfSpecializationLoc)
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return;
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const SourceManager &SM = *Result.SourceManager;
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SourceLocation RAngleLoc =
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SM.getExpansionLoc(EnableIfSpecializationLoc->getRAngleLoc());
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auto Diag = diag(EnableIf->getBeginLoc(),
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"incorrect std::enable_if usage detected; use "
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"'typename std::enable_if<...>::type'");
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if (!getLangOpts().CPlusPlus20) {
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Diag << FixItHint::CreateInsertion(ElaboratedLoc->getBeginLoc(),
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"typename ");
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}
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Diag << FixItHint::CreateInsertion(RAngleLoc.getLocWithOffset(1), "::type");
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}
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} // namespace clang::tidy::bugprone
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