//===-- DebugNamesDWARFIndex.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 LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H
#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H

#include "Plugins/SymbolFile/DWARF/DWARFIndex.h"
#include "Plugins/SymbolFile/DWARF/LogChannelDWARF.h"
#include "Plugins/SymbolFile/DWARF/ManualDWARFIndex.h"
#include "Plugins/SymbolFile/DWARF/SymbolFileDWARF.h"
#include "lldb/Utility/ConstString.h"
#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
#include <optional>

namespace lldb_private::plugin {
namespace dwarf {
class DebugNamesDWARFIndex : public DWARFIndex {
public:
  static llvm::Expected<std::unique_ptr<DebugNamesDWARFIndex>>
  Create(Module &module, DWARFDataExtractor debug_names,
         DWARFDataExtractor debug_str, SymbolFileDWARF &dwarf);

  void Preload() override { m_fallback.Preload(); }

  void
  GetGlobalVariables(ConstString basename,
                     llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void
  GetGlobalVariables(const RegularExpression &regex,
                     llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void
  GetGlobalVariables(DWARFUnit &cu,
                     llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void
  GetObjCMethods(ConstString class_name,
                 llvm::function_ref<bool(DWARFDIE die)> callback) override {}
  void GetCompleteObjCClass(
      ConstString class_name, bool must_be_implementation,
      llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void GetTypes(ConstString name,
                llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void GetTypes(const DWARFDeclContext &context,
                llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void GetNamespaces(ConstString name,
                     llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void GetFunctions(const Module::LookupInfo &lookup_info,
                    SymbolFileDWARF &dwarf,
                    const CompilerDeclContext &parent_decl_ctx,
                    llvm::function_ref<bool(DWARFDIE die)> callback) override;
  void GetFunctions(const RegularExpression &regex,
                    llvm::function_ref<bool(DWARFDIE die)> callback) override;

  void Dump(Stream &s) override;

private:
  DebugNamesDWARFIndex(Module &module,
                       std::unique_ptr<llvm::DWARFDebugNames> debug_names_up,
                       DWARFDataExtractor debug_names_data,
                       DWARFDataExtractor debug_str_data,
                       SymbolFileDWARF &dwarf)
      : DWARFIndex(module), m_debug_info(dwarf.DebugInfo()),
        m_debug_names_data(debug_names_data), m_debug_str_data(debug_str_data),
        m_debug_names_up(std::move(debug_names_up)),
        m_fallback(module, dwarf, GetUnits(*m_debug_names_up)) {}

  DWARFDebugInfo &m_debug_info;

  // LLVM DWARFDebugNames will hold a non-owning reference to this data, so keep
  // track of the ownership here.
  DWARFDataExtractor m_debug_names_data;
  DWARFDataExtractor m_debug_str_data;

  using DebugNames = llvm::DWARFDebugNames;
  std::unique_ptr<DebugNames> m_debug_names_up;
  ManualDWARFIndex m_fallback;

  std::optional<DIERef> ToDIERef(const DebugNames::Entry &entry) const;
  bool ProcessEntry(const DebugNames::Entry &entry,
                    llvm::function_ref<bool(DWARFDIE die)> callback);

  static void MaybeLogLookupError(llvm::Error error,
                                  const DebugNames::NameIndex &ni,
                                  llvm::StringRef name);

  static llvm::DenseSet<dw_offset_t> GetUnits(const DebugNames &debug_names);
};

} // namespace dwarf
} // namespace lldb_private::plugin

#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H