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[clang-tidy][NFC] Do less unnecessary work in modernize-deprecated-headers #160967

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Merged
merged 2 commits into from
Oct 9, 2025
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[clang-tidy][NFC] Do less unnecessary work in modernize-deprecated-headers #160967

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f774e44
[clang-tidy][NFC] Do less unnecessary work in `modernize-deprecated-h…
localspook Sep 26, 2025
844c5a6
Prefer insert functions over raw loops
localspook Oct 9, 2025
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79 changes: 33 additions & 46 deletions clang-tools-extra/clang-tidy/modernize/DeprecatedHeadersCheck.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -24,8 +24,9 @@ namespace {
class IncludeModernizePPCallbacks : public PPCallbacks {
public:
explicit IncludeModernizePPCallbacks(
std::vector<IncludeMarker> &IncludesToBeProcessed, LangOptions LangOpts,
const SourceManager &SM, bool CheckHeaderFile);
std::vector<IncludeMarker> &IncludesToBeProcessed,
const LangOptions &LangOpts, const SourceManager &SM,
bool CheckHeaderFile);

void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
StringRef FileName, bool IsAngled,
Expand All @@ -37,8 +38,7 @@ class IncludeModernizePPCallbacks : public PPCallbacks {

private:
std::vector<IncludeMarker> &IncludesToBeProcessed;
LangOptions LangOpts;
llvm::StringMap<std::string> CStyledHeaderToCxx;
llvm::StringMap<StringRef> CStyledHeaderToCxx;
llvm::StringSet<> DeleteHeaders;
const SourceManager &SM;
bool CheckHeaderFile;
Expand Down Expand Up @@ -131,48 +131,35 @@ void DeprecatedHeadersCheck::check(
}

IncludeModernizePPCallbacks::IncludeModernizePPCallbacks(
std::vector<IncludeMarker> &IncludesToBeProcessed, LangOptions LangOpts,
const SourceManager &SM, bool CheckHeaderFile)
: IncludesToBeProcessed(IncludesToBeProcessed), LangOpts(LangOpts), SM(SM),
std::vector<IncludeMarker> &IncludesToBeProcessed,
const LangOptions &LangOpts, const SourceManager &SM, bool CheckHeaderFile)
: IncludesToBeProcessed(IncludesToBeProcessed), SM(SM),
CheckHeaderFile(CheckHeaderFile) {
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);
}

static constexpr std::pair<StringRef, StringRef> CXX98Headers[] = {
{"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(std::begin(CXX98Headers), std::end(CXX98Headers));

static constexpr std::pair<StringRef, StringRef> CXX11Headers[] = {
{"fenv.h", "cfenv"}, {"stdint.h", "cstdint"},
{"inttypes.h", "cinttypes"}, {"tgmath.h", "ctgmath"},
{"uchar.h", "cuchar"},
};
if (LangOpts.CPlusPlus11)
CStyledHeaderToCxx.insert(std::begin(CXX11Headers), std::end(CXX11Headers));

static constexpr StringRef HeadersToDelete[] = {"stdalign.h", "stdbool.h",
"iso646.h"};
DeleteHeaders.insert_range(HeadersToDelete);
}

void IncludeModernizePPCallbacks::InclusionDirective(
Expand Down Expand Up @@ -205,7 +192,7 @@ void IncludeModernizePPCallbacks::InclusionDirective(
} else if (DeleteHeaders.contains(FileName)) {
IncludesToBeProcessed.emplace_back(
// NOLINTNEXTLINE(modernize-use-emplace) - false-positive
IncludeMarker{std::string{}, FileName,
IncludeMarker{StringRef{}, FileName,
SourceRange{HashLoc, FilenameRange.getEnd()}, DiagLoc});
}
}
Expand Down
2 changes: 1 addition & 1 deletion clang-tools-extra/clang-tidy/modernize/DeprecatedHeadersCheck.h
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@ class DeprecatedHeadersCheck : public ClangTidyCheck {
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;

struct IncludeMarker {
std::string Replacement;
StringRef Replacement;
StringRef FileName;
SourceRange ReplacementRange;
SourceLocation DiagLoc;
Expand Down