MCDXContainerWriter.h

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//===- llvm/MC/MCDXContainerWriter.h - DXContainer Writer -*- 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_MC_MCDXCONTAINERWRITER_H
#define LLVM_MC_MCDXCONTAINERWRITER_H
 
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/TargetParser/Triple.h"
 
namespace llvm {
 
class raw_pwrite_stream;
 
class LLVM_ABI MCDXContainerTargetWriter : public MCObjectTargetWriter {
protected:
  MCDXContainerTargetWriter() {}
 
public:
  ~MCDXContainerTargetWriter() override;
 
  Triple::ObjectFormatType getFormat() const override {
    return Triple::DXContainer;
  }
  static bool classof(const MCObjectTargetWriter *W) {
    return W->getFormat() == Triple::DXContainer;
  }
};
 
/// Contains PDB output file name.
static constexpr StringLiteral PdbFileNameSectionName = "PDBNAME";
/// Contains module hash.
static constexpr StringLiteral ModuleHashSectionName = "PDBHASH";
 
struct MCDXContainerPart {
  StringRef Name;
  StringRef Data;
};
 
class LLVM_ABI MCDXContainerBaseWriter {
protected:
  virtual ArrayRef<MCDXContainerPart> collectParts() {
    llvm_unreachable("Unimplemented");
  }
 
  virtual bool shouldSkipSection(StringRef SectionName, size_t SectionSize) {
    // Skip empty and auxiliary sections.
    return SectionSize == 0 || SectionName == PdbFileNameSectionName ||
           SectionName == ModuleHashSectionName;
  }
 
public:
  MCDXContainerBaseWriter() {}
  virtual ~MCDXContainerBaseWriter();
 
  void write(raw_ostream &OS, const Triple &TT);
};
 
class LLVM_ABI DXContainerObjectWriter final : public MCDXContainerBaseWriter,
                                               public MCObjectWriter {
  support::endian::Writer W;
  std::unique_ptr<MCDXContainerTargetWriter> TargetObjectWriter;
  SmallVector<MCDXContainerPart> Parts;
  SmallVector<SmallString<0>> SectionBuffers;
 
  void clearParts();
 
protected:
  ArrayRef<MCDXContainerPart> collectParts() override;
 
public:
  DXContainerObjectWriter(std::unique_ptr<MCDXContainerTargetWriter> MOTW,
                          raw_pwrite_stream &OS)
      : W(OS, llvm::endianness::little), TargetObjectWriter(std::move(MOTW)) {}
 
  uint64_t writeObject() override;
};
 
} // end namespace llvm
 
#endif // LLVM_MC_MCDXCONTAINERWRITER_H