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//===- ExpandModularHeadersPPCallbacks.h - clang-tidy -----------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLING_EXPANDMODULARHEADERSPPCALLBACKS_H_
#define LLVM_CLANG_TOOLING_EXPANDMODULARHEADERSPPCALLBACKS_H_
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/DenseSet.h"
namespace llvm::vfs {
class OverlayFileSystem;
class InMemoryFileSystem;
} // namespace llvm::vfs
namespace clang {
class CompilerInstance;
namespace serialization {
class ModuleFile;
} // namespace serialization
namespace tooling {
/// Handles PPCallbacks and re-runs preprocessing of the whole
/// translation unit with modules disabled.
///
/// This way it's possible to get PPCallbacks for the whole translation unit
/// including the contents of the modular headers and all their transitive
/// includes.
///
/// This allows existing tools based on PPCallbacks to retain their functionality
/// when running with C++ modules enabled. This only works in the backwards
/// compatible modules mode, i.e. when code can still be parsed in non-modular
/// way.
class ExpandModularHeadersPPCallbacks : public PPCallbacks {
public:
ExpandModularHeadersPPCallbacks(
CompilerInstance *Compiler,
IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFS);
~ExpandModularHeadersPPCallbacks();
/// Returns the preprocessor that provides callbacks for the whole
/// translation unit, including the main file, textual headers, and modular
/// headers.
///
/// This preprocessor is separate from the one used by the rest of the
/// compiler.
Preprocessor *getPreprocessor() const;
private:
class FileRecorder;
void handleModuleFile(serialization::ModuleFile *MF);
void parseToLocation(SourceLocation Loc);
// Handle PPCallbacks.
void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType,
FileID PrevFID) override;
void InclusionDirective(SourceLocation DirectiveLoc,
const Token &IncludeToken, StringRef IncludedFilename,
bool IsAngled, CharSourceRange FilenameRange,
OptionalFileEntryRef IncludedFile,
StringRef SearchPath, StringRef RelativePath,
const Module *Imported,
SrcMgr::CharacteristicKind FileType) override;
void EndOfMainFile() override;
// Handle all other callbacks.
// Just parse to the corresponding location to generate PPCallbacks for the
// corresponding range
void Ident(SourceLocation Loc, StringRef) override;
void PragmaDirective(SourceLocation Loc, PragmaIntroducerKind) override;
void PragmaComment(SourceLocation Loc, const IdentifierInfo *,
StringRef) override;
void PragmaDetectMismatch(SourceLocation Loc, StringRef, StringRef) override;
void PragmaDebug(SourceLocation Loc, StringRef) override;
void PragmaMessage(SourceLocation Loc, StringRef, PragmaMessageKind,
StringRef) override;
void PragmaDiagnosticPush(SourceLocation Loc, StringRef) override;
void PragmaDiagnosticPop(SourceLocation Loc, StringRef) override;
void PragmaDiagnostic(SourceLocation Loc, StringRef, diag::Severity,
StringRef) override;
void HasInclude(SourceLocation Loc, StringRef, bool, OptionalFileEntryRef,
SrcMgr::CharacteristicKind) override;
void PragmaOpenCLExtension(SourceLocation NameLoc, const IdentifierInfo *,
SourceLocation StateLoc, unsigned) override;
void PragmaWarning(SourceLocation Loc, PragmaWarningSpecifier,
ArrayRef<int>) override;
void PragmaWarningPush(SourceLocation Loc, int) override;
void PragmaWarningPop(SourceLocation Loc) override;
void PragmaAssumeNonNullBegin(SourceLocation Loc) override;
void PragmaAssumeNonNullEnd(SourceLocation Loc) override;
void MacroExpands(const Token &MacroNameTok, const MacroDefinition &,
SourceRange Range, const MacroArgs *) override;
void MacroDefined(const Token &MacroNameTok,
const MacroDirective *MD) override;
void MacroUndefined(const Token &, const MacroDefinition &,
const MacroDirective *Undef) override;
void Defined(const Token &MacroNameTok, const MacroDefinition &,
SourceRange Range) override;
void SourceRangeSkipped(SourceRange Range, SourceLocation EndifLoc) override;
void If(SourceLocation Loc, SourceRange, ConditionValueKind) override;
void Elif(SourceLocation Loc, SourceRange, ConditionValueKind,
SourceLocation) override;
void Ifdef(SourceLocation Loc, const Token &,
const MacroDefinition &) override;
void Ifndef(SourceLocation Loc, const Token &,
const MacroDefinition &) override;
void Else(SourceLocation Loc, SourceLocation) override;
void Endif(SourceLocation Loc, SourceLocation) override;
std::unique_ptr<FileRecorder> Recorder;
// Set of all the modules visited. Avoids processing a module more than once.
llvm::DenseSet<serialization::ModuleFile *> VisitedModules;
CompilerInstance &Compiler;
// Additional filesystem for replay. Provides all input files from modules.
llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFs;
SourceManager &Sources;
DiagnosticsEngine Diags;
LangOptions LangOpts;
TrivialModuleLoader ModuleLoader;
std::unique_ptr<HeaderSearch> HeaderInfo;
std::unique_ptr<Preprocessor> PP;
bool EnteredMainFile = false;
bool StartedLexing = false;
Token CurrentToken;
};
} // namespace tooling
} // namespace clang
#endif // LLVM_CLANG_TOOLING_EXPANDMODULARHEADERSPPCALLBACKS_H_
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