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