DeprecatedHeadersCheck.cpp
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//===--- DeprecatedHeadersCheck.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 "DeprecatedHeadersCheck.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringSet.h"
#include <vector>
namespace clang {
namespace tidy {
namespace modernize {
namespace {
class IncludeModernizePPCallbacks : public PPCallbacks {
public:
explicit IncludeModernizePPCallbacks(ClangTidyCheck &Check,
LangOptions LangOpts);
void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
StringRef FileName, bool IsAngled,
CharSourceRange FilenameRange, const FileEntry *File,
StringRef SearchPath, StringRef RelativePath,
const Module *Imported,
SrcMgr::CharacteristicKind FileType) override;
private:
ClangTidyCheck &Check;
LangOptions LangOpts;
llvm::StringMap<std::string> CStyledHeaderToCxx;
llvm::StringSet<> DeleteHeaders;
};
} // namespace
void DeprecatedHeadersCheck::registerPPCallbacks(
const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) {
if (getLangOpts().CPlusPlus) {
PP->addPPCallbacks(
::std::make_unique<IncludeModernizePPCallbacks>(*this, getLangOpts()));
}
}
IncludeModernizePPCallbacks::IncludeModernizePPCallbacks(ClangTidyCheck &Check,
LangOptions LangOpts)
: Check(Check), LangOpts(LangOpts) {
for (const auto &KeyValue :
std::vector<std::pair<llvm::StringRef, std::string>>(
{{"assert.h", "cassert"},
{"complex.h", "complex"},
{"ctype.h", "cctype"},
{"errno.h", "cerrno"},
{"float.h", "cfloat"},
{"limits.h", "climits"},
{"locale.h", "clocale"},
{"math.h", "cmath"},
{"setjmp.h", "csetjmp"},
{"signal.h", "csignal"},
{"stdarg.h", "cstdarg"},
{"stddef.h", "cstddef"},
{"stdio.h", "cstdio"},
{"stdlib.h", "cstdlib"},
{"string.h", "cstring"},
{"time.h", "ctime"},
{"wchar.h", "cwchar"},
{"wctype.h", "cwctype"}})) {
CStyledHeaderToCxx.insert(KeyValue);
}
// Add C++ 11 headers.
if (LangOpts.CPlusPlus11) {
for (const auto &KeyValue :
std::vector<std::pair<llvm::StringRef, std::string>>(
{{"fenv.h", "cfenv"},
{"stdint.h", "cstdint"},
{"inttypes.h", "cinttypes"},
{"tgmath.h", "ctgmath"},
{"uchar.h", "cuchar"}})) {
CStyledHeaderToCxx.insert(KeyValue);
}
}
for (const auto &Key :
std::vector<std::string>({"stdalign.h", "stdbool.h", "iso646.h"})) {
DeleteHeaders.insert(Key);
}
}
void IncludeModernizePPCallbacks::InclusionDirective(
SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
bool IsAngled, CharSourceRange FilenameRange, const FileEntry *File,
StringRef SearchPath, StringRef RelativePath, const Module *Imported,
SrcMgr::CharacteristicKind FileType) {
// FIXME: Take care of library symbols from the global namespace.
//
// Reasonable options for the check:
//
// 1. Insert std prefix for every such symbol occurrence.
// 2. Insert `using namespace std;` to the beginning of TU.
// 3. Do nothing and let the user deal with the migration himself.
if (CStyledHeaderToCxx.count(FileName) != 0) {
std::string Replacement =
(llvm::Twine("<") + CStyledHeaderToCxx[FileName] + ">").str();
Check.diag(FilenameRange.getBegin(), "inclusion of deprecated C++ header "
"'%0'; consider using '%1' instead")
<< FileName << CStyledHeaderToCxx[FileName]
<< FixItHint::CreateReplacement(FilenameRange.getAsRange(),
Replacement);
} else if (DeleteHeaders.count(FileName) != 0) {
Check.diag(FilenameRange.getBegin(),
"including '%0' has no effect in C++; consider removing it")
<< FileName << FixItHint::CreateRemoval(
SourceRange(HashLoc, FilenameRange.getEnd()));
}
}
} // namespace modernize
} // namespace tidy
} // namespace clang