forked from OSchip/llvm-project
100 lines
2.9 KiB
C++
100 lines
2.9 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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template <class ELFT> class InputSection;
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// Struct represents single entry of address area of gdb index.
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template <class ELFT> struct AddressEntry {
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InputSectionBase<ELFT> *Section;
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uint64_t LowAddress;
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uint64_t HighAddress;
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size_t CuIndex;
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};
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// GdbIndexBuilder is a helper class used for extracting data required
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// for building .gdb_index section from objects.
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template <class ELFT> class GdbIndexBuilder : public llvm::LoadedObjectInfo {
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typedef typename ELFT::uint uintX_t;
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InputSection<ELFT> *DebugInfoSec;
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std::unique_ptr<llvm::DWARFContext> Dwarf;
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public:
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GdbIndexBuilder(InputSection<ELFT> *DebugInfoSec);
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// Extracts the compilation units. Each first element of pair is a offset of a
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// CU in the .debug_info section and second is the length of that CU.
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std::vector<std::pair<uintX_t, uintX_t>> readCUList();
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// Extracts the vector of address area entries. Accepts global index of last
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// parsed CU.
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std::vector<AddressEntry<ELFT>> readAddressArea(size_t CurrentCU);
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// Method extracts public names and types. It returns list of name and
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// gnu_pub* kind pairs.
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std::vector<std::pair<StringRef, uint8_t>> readPubNamesAndTypes();
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private:
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// Method returns section file offset as a load addres for DWARF parser. That
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// allows to find the target section index for address ranges.
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uint64_t
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getSectionLoadAddress(const llvm::object::SectionRef &Sec) const override;
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std::unique_ptr<llvm::LoadedObjectInfo> clone() const override;
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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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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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void expand();
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GdbSymbol **findSlot(uint32_t Hash, size_t Offset);
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llvm::BumpPtrAllocator Alloc;
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std::vector<GdbSymbol *> Table;
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// Size keeps the amount of filled entries in Table.
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size_t Size = 0;
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// Initial size must be a power of 2.
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static const int32_t InitialSize = 1024;
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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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