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//===--- DeprecatedIosBaseAliasesCheck.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 "DeprecatedIosBaseAliasesCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include <optional>
using namespace clang::ast_matchers;
namespace clang::tidy::modernize {
static constexpr std::array<StringRef, 5> DeprecatedTypes = {
"::std::ios_base::io_state", "::std::ios_base::open_mode",
"::std::ios_base::seek_dir", "::std::ios_base::streamoff",
"::std::ios_base::streampos"};
static std::optional<const char *> getReplacementType(StringRef Type) {
return llvm::StringSwitch<std::optional<const char *>>(Type)
.Case("io_state", "iostate")
.Case("open_mode", "openmode")
.Case("seek_dir", "seekdir")
.Default(std::nullopt);
}
void DeprecatedIosBaseAliasesCheck::registerMatchers(MatchFinder *Finder) {
auto IoStateDecl = typedefDecl(hasAnyName(DeprecatedTypes)).bind("TypeDecl");
auto IoStateType =
qualType(hasDeclaration(IoStateDecl), unless(elaboratedType()));
Finder->addMatcher(typeLoc(loc(IoStateType)).bind("TypeLoc"), this);
}
void DeprecatedIosBaseAliasesCheck::check(
const MatchFinder::MatchResult &Result) {
SourceManager &SM = *Result.SourceManager;
const auto *Typedef = Result.Nodes.getNodeAs<TypedefDecl>("TypeDecl");
StringRef TypeName = Typedef->getName();
auto Replacement = getReplacementType(TypeName);
const auto *TL = Result.Nodes.getNodeAs<TypeLoc>("TypeLoc");
SourceLocation IoStateLoc = TL->getBeginLoc();
// Do not generate fixits for matches depending on template arguments and
// macro expansions.
bool Fix = Replacement && !TL->getType()->isDependentType();
if (IoStateLoc.isMacroID()) {
IoStateLoc = SM.getSpellingLoc(IoStateLoc);
Fix = false;
}
SourceLocation EndLoc = IoStateLoc.getLocWithOffset(TypeName.size() - 1);
if (Replacement) {
const char *FixName = *Replacement;
auto Builder = diag(IoStateLoc, "'std::ios_base::%0' is deprecated; use "
"'std::ios_base::%1' instead")
<< TypeName << FixName;
if (Fix)
Builder << FixItHint::CreateReplacement(SourceRange(IoStateLoc, EndLoc),
FixName);
} else
diag(IoStateLoc, "'std::ios_base::%0' is deprecated") << TypeName;
}
} // namespace clang::tidy::modernize
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