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//===- GdbIndex.h --------------------------------------------*- C++ -*-===//
// The LLVM Linker
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "InputFiles.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Object/ELF.h"
namespace lld {
namespace elf {
class InputSection;
// Struct represents single entry of address area of gdb index.
struct AddressEntry {
InputSection *Section;
uint64_t LowAddress;
uint64_t HighAddress;
uint32_t CuIndex;
// Struct represents single entry of compilation units list area of gdb index.
// It consist of CU offset in .debug_info section and it's size.
struct CompilationUnitEntry {
uint64_t CuOffset;
uint64_t CuLength;
// Represents data about symbol and type names which are used
// to build symbol table and constant pool area of gdb index.
struct NameTypeEntry {
StringRef Name;
uint8_t Type;
// We fill one GdbIndexDataChunk for each object where scan of
// debug information performed. That information futher used
// for filling gdb index section areas.
struct GdbIndexChunk {
InputSection *DebugInfoSec;
std::vector<AddressEntry> AddressArea;
std::vector<CompilationUnitEntry> CompilationUnits;
std::vector<NameTypeEntry> NamesAndTypes;
// Element of GdbHashTab hash table.
struct GdbSymbol {
GdbSymbol(uint32_t Hash, size_t Offset)
: NameHash(Hash), NameOffset(Offset) {}
uint32_t NameHash;
size_t NameOffset;
size_t CuVectorIndex;
// This class manages the hashed symbol table for the .gdb_index section.
// The hash value for a table entry is computed by applying an iterative hash
// function to the symbol's name.
class GdbHashTab final {
std::pair<bool, GdbSymbol *> add(uint32_t Hash, size_t Offset);
void finalizeContents();
size_t getCapacity() { return Table.size(); }
GdbSymbol *getSymbol(size_t I) { return Table[I]; }
llvm::DenseMap<size_t, GdbSymbol *> Map;
std::vector<GdbSymbol *> Table;
} // namespace elf
} // namespace lld