COFF/DLL.h

//===- DLL.h ----------------------------------------------------*- 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 LLD_COFF_DLL_H
#define LLD_COFF_DLL_H

#include "Chunks.h"
#include "Symbols.h"

namespace lld::coff {

// Windows-specific.
// IdataContents creates all chunks for the DLL import table.
// You are supposed to call add() to add symbols and then
// call create() to populate the chunk vectors.
class IdataContents {
public:
  void add(DefinedImportData *sym) { imports.push_back(sym); }
  bool empty() { return imports.empty(); }

  void create(COFFLinkerContext &ctx);

  std::vector<DefinedImportData *> imports;
  std::vector<Chunk *> dirs;
  std::vector<Chunk *> lookups;
  std::vector<Chunk *> addresses;
  std::vector<Chunk *> hints;
  std::vector<Chunk *> dllNames;
};

// Windows-specific.
// DelayLoadContents creates all chunks for the delay-load DLL import table.
class DelayLoadContents {
public:
  DelayLoadContents(COFFLinkerContext &ctx) : ctx(ctx) {}
  void add(DefinedImportData *sym) { imports.push_back(sym); }
  bool empty() { return imports.empty(); }
  void create(Defined *helper);
  std::vector<Chunk *> getChunks();
  std::vector<Chunk *> getDataChunks();
  ArrayRef<Chunk *> getCodeChunks() { return thunks; }
  ArrayRef<Chunk *> getCodePData() { return pdata; }
  ArrayRef<Chunk *> getCodeUnwindInfo() { return unwindinfo; }

  uint64_t getDirRVA() { return dirs[0]->getRVA(); }
  uint64_t getDirSize();

private:
  Chunk *newThunkChunk(DefinedImportData *s, Chunk *tailMerge);
  Chunk *newTailMergeChunk(Chunk *dir);
  Chunk *newTailMergePDataChunk(Chunk *tm, Chunk *unwind);
  Chunk *newTailMergeUnwindInfoChunk();

  Defined *helper;
  std::vector<DefinedImportData *> imports;
  std::vector<Chunk *> dirs;
  std::vector<Chunk *> moduleHandles;
  std::vector<Chunk *> addresses;
  std::vector<Chunk *> names;
  std::vector<Chunk *> hintNames;
  std::vector<Chunk *> thunks;
  std::vector<Chunk *> pdata;
  std::vector<Chunk *> unwindinfo;
  std::vector<Chunk *> dllNames;

  COFFLinkerContext &ctx;
};

// Windows-specific.
// EdataContents creates all chunks for the DLL export table.
class EdataContents {
public:
  EdataContents(COFFLinkerContext &ctx);
  std::vector<Chunk *> chunks;

  uint64_t getRVA() { return chunks[0]->getRVA(); }
  uint64_t getSize() {
    return chunks.back()->getRVA() + chunks.back()->getSize() - getRVA();
  }

  COFFLinkerContext &ctx;
};

} // namespace lld::coff

#endif