SymbolizableObjectFile.h

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//===- SymbolizableObjectFile.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
//
//===----------------------------------------------------------------------===//
//
// This file declares the SymbolizableObjectFile class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_SYMBOLIZE_SYMBOLIZABLEOBJECTFILE_H
#define LLVM_DEBUGINFO_SYMBOLIZE_SYMBOLIZABLEOBJECTFILE_H
 
#include "llvm/ADT/StringRef.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/Symbolize/SymbolizableModule.h"
#include "llvm/Support/Error.h"
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
#include <vector>
 
namespace llvm {
 
class DataExtractor;
 
namespace symbolize {
 
class SymbolizableObjectFile : public SymbolizableModule {
public:
  static Expected<std::unique_ptr<SymbolizableObjectFile>>
  create(const object::ObjectFile *Obj, std::unique_ptr<DIContext> DICtx,
         bool UntagAddresses);
 
  DILineInfo symbolizeCode(object::SectionedAddress ModuleOffset,
                           DILineInfoSpecifier LineInfoSpecifier,
                           bool UseSymbolTable) const override;
  DIInliningInfo symbolizeInlinedCode(object::SectionedAddress ModuleOffset,
                                      DILineInfoSpecifier LineInfoSpecifier,
                                      bool UseSymbolTable) const override;
  DIGlobal symbolizeData(object::SectionedAddress ModuleOffset) const override;
  std::vector<DILocal>
  symbolizeFrame(object::SectionedAddress ModuleOffset) const override;
  std::vector<object::SectionedAddress>
  findSymbol(StringRef Symbol, uint64_t Offset) const override;
 
  // Return true if this is a 32-bit x86 PE COFF module.
  bool isWin32Module() const override;
 
  // Returns the preferred base of the module, i.e. where the loader would place
  // it in memory assuming there were no conflicts.
  uint64_t getModulePreferredBase() const override;
 
private:
  bool shouldOverrideWithSymbolTable(FunctionNameKind FNKind,
                                     bool UseSymbolTable) const;
 
  bool getNameFromSymbolTable(uint64_t Address, std::string &Name,
                              uint64_t &Addr, uint64_t &Size,
                              std::string &FileName) const;
  // For big-endian PowerPC64 ELF, OpdAddress is the address of the .opd
  // (function descriptor) section and OpdExtractor refers to its contents.
  Error addSymbol(const object::SymbolRef &Symbol, uint64_t SymbolSize,
                  DataExtractor *OpdExtractor = nullptr,
                  uint64_t OpdAddress = 0);
  Error addCoffExportSymbols(const object::COFFObjectFile *CoffObj);
 
  /// Search for the first occurence of specified Address in ObjectFile.
  uint64_t getModuleSectionIndexForAddress(uint64_t Address) const;
 
  const object::ObjectFile *Module;
  std::unique_ptr<DIContext> DebugInfoContext;
  bool UntagAddresses;
 
  struct SymbolDesc {
    uint64_t Addr;
    // If size is 0, assume that symbol occupies the whole memory range up to
    // the following symbol.
    uint64_t Size;
 
    StringRef Name;
    // Non-zero if this is an ELF local symbol. See the comment in
    // getNameFromSymbolTable.
    uint32_t ELFLocalSymIdx;
 
    bool operator<(const SymbolDesc &RHS) const {
      return Addr != RHS.Addr ? Addr < RHS.Addr : Size < RHS.Size;
    }
  };
  std::vector<SymbolDesc> Symbols;
  // (index, filename) pairs of ELF STT_FILE symbols.
  std::vector<std::pair<uint32_t, StringRef>> FileSymbols;
 
  SymbolizableObjectFile(const object::ObjectFile *Obj,
                         std::unique_ptr<DIContext> DICtx,
                         bool UntagAddresses);
};
 
} // end namespace symbolize
 
} // end namespace llvm
 
#endif // LLVM_DEBUGINFO_SYMBOLIZE_SYMBOLIZABLEOBJECTFILE_H