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//===-- PCHContainerOperations.h - PCH Containers ---------------*- 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_SERIALIZATION_PCHCONTAINEROPERATIONS_H
#define LLVM_CLANG_SERIALIZATION_PCHCONTAINEROPERATIONS_H
#include "clang/Basic/Module.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/MemoryBufferRef.h"
#include <memory>
namespace llvm {
class raw_pwrite_stream;
}
namespace clang {
class ASTConsumer;
class CompilerInstance;
struct PCHBuffer {
ASTFileSignature Signature;
llvm::SmallVector<char, 0> Data;
bool IsComplete;
};
/// This abstract interface provides operations for creating
/// containers for serialized ASTs (precompiled headers and clang
/// modules).
class PCHContainerWriter {
public:
virtual ~PCHContainerWriter() = 0;
virtual llvm::StringRef getFormat() const = 0;
/// Return an ASTConsumer that can be chained with a
/// PCHGenerator that produces a wrapper file format containing a
/// serialized AST bitstream.
virtual std::unique_ptr<ASTConsumer>
CreatePCHContainerGenerator(CompilerInstance &CI,
const std::string &MainFileName,
const std::string &OutputFileName,
std::unique_ptr<llvm::raw_pwrite_stream> OS,
std::shared_ptr<PCHBuffer> Buffer) const = 0;
};
/// This abstract interface provides operations for unwrapping
/// containers for serialized ASTs (precompiled headers and clang
/// modules).
class PCHContainerReader {
public:
virtual ~PCHContainerReader() = 0;
/// Equivalent to the format passed to -fmodule-format=
virtual llvm::ArrayRef<llvm::StringRef> getFormats() const = 0;
/// Returns the serialized AST inside the PCH container Buffer.
virtual llvm::StringRef ExtractPCH(llvm::MemoryBufferRef Buffer) const = 0;
};
/// Implements write operations for a raw pass-through PCH container.
class RawPCHContainerWriter : public PCHContainerWriter {
llvm::StringRef getFormat() const override { return "raw"; }
/// Return an ASTConsumer that can be chained with a
/// PCHGenerator that writes the module to a flat file.
std::unique_ptr<ASTConsumer>
CreatePCHContainerGenerator(CompilerInstance &CI,
const std::string &MainFileName,
const std::string &OutputFileName,
std::unique_ptr<llvm::raw_pwrite_stream> OS,
std::shared_ptr<PCHBuffer> Buffer) const override;
};
/// Implements read operations for a raw pass-through PCH container.
class RawPCHContainerReader : public PCHContainerReader {
llvm::ArrayRef<llvm::StringRef> getFormats() const override;
/// Simply returns the buffer contained in Buffer.
llvm::StringRef ExtractPCH(llvm::MemoryBufferRef Buffer) const override;
};
/// A registry of PCHContainerWriter and -Reader objects for different formats.
class PCHContainerOperations {
llvm::StringMap<std::unique_ptr<PCHContainerWriter>> Writers;
llvm::StringMap<PCHContainerReader *> Readers;
llvm::SmallVector<std::unique_ptr<PCHContainerReader>> OwnedReaders;
public:
/// Automatically registers a RawPCHContainerWriter and
/// RawPCHContainerReader.
PCHContainerOperations();
void registerWriter(std::unique_ptr<PCHContainerWriter> Writer) {
Writers[Writer->getFormat()] = std::move(Writer);
}
void registerReader(std::unique_ptr<PCHContainerReader> Reader) {
assert(!Reader->getFormats().empty() &&
"PCHContainerReader must handle >=1 format");
for (llvm::StringRef Fmt : Reader->getFormats())
Readers[Fmt] = Reader.get();
OwnedReaders.push_back(std::move(Reader));
}
const PCHContainerWriter *getWriterOrNull(llvm::StringRef Format) {
return Writers[Format].get();
}
const PCHContainerReader *getReaderOrNull(llvm::StringRef Format) {
return Readers[Format];
}
const PCHContainerReader &getRawReader() {
return *getReaderOrNull("raw");
}
};
}
#endif
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