Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 400 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.h b/gnu/llvm/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.h
new file mode 100644
index 00000000000..3b273896cb5
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.h
@@ -0,0 +1,400 @@
+//===-- ObjectFileELF.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 liblldb_ObjectFileELF_h_
+#define liblldb_ObjectFileELF_h_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Utility/ArchSpec.h"
+#include "lldb/Utility/FileSpec.h"
+#include "lldb/Utility/UUID.h"
+#include "lldb/lldb-private.h"
+
+#include "ELFHeader.h"
+
+struct ELFNote {
+  elf::elf_word n_namesz;
+  elf::elf_word n_descsz;
+  elf::elf_word n_type;
+
+  std::string n_name;
+
+  ELFNote() : n_namesz(0), n_descsz(0), n_type(0) {}
+
+  /// Parse an ELFNote entry from the given DataExtractor starting at position
+  /// \p offset.
+  ///
+  /// \param[in] data
+  ///    The DataExtractor to read from.
+  ///
+  /// \param[in,out] offset
+  ///    Pointer to an offset in the data.  On return the offset will be
+  ///    advanced by the number of bytes read.
+  ///
+  /// \return
+  ///    True if the ELFRel entry was successfully read and false otherwise.
+  bool Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset);
+
+  size_t GetByteSize() const {
+    return 12 + llvm::alignTo(n_namesz, 4) + llvm::alignTo(n_descsz, 4);
+  }
+};
+
+/// \class ObjectFileELF
+/// Generic ELF object file reader.
+///
+/// This class provides a generic ELF (32/64 bit) reader plugin implementing
+/// the ObjectFile protocol.
+class ObjectFileELF : public lldb_private::ObjectFile {
+public:
+  // Static Functions
+  static void Initialize();
+
+  static void Terminate();
+
+  static lldb_private::ConstString GetPluginNameStatic();
+
+  static const char *GetPluginDescriptionStatic();
+
+  static lldb_private::ObjectFile *
+  CreateInstance(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
+                 lldb::offset_t data_offset, const lldb_private::FileSpec *file,
+                 lldb::offset_t file_offset, lldb::offset_t length);
+
+  static lldb_private::ObjectFile *CreateMemoryInstance(
+      const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
+      const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
+
+  static size_t GetModuleSpecifications(const lldb_private::FileSpec &file,
+                                        lldb::DataBufferSP &data_sp,
+                                        lldb::offset_t data_offset,
+                                        lldb::offset_t file_offset,
+                                        lldb::offset_t length,
+                                        lldb_private::ModuleSpecList &specs);
+
+  static bool MagicBytesMatch(lldb::DataBufferSP &data_sp, lldb::addr_t offset,
+                              lldb::addr_t length);
+
+  // PluginInterface protocol
+  lldb_private::ConstString GetPluginName() override;
+
+  uint32_t GetPluginVersion() override;
+
+  // LLVM RTTI support
+  static char ID;
+  bool isA(const void *ClassID) const override {
+    return ClassID == &ID || ObjectFile::isA(ClassID);
+  }
+  static bool classof(const ObjectFile *obj) { return obj->isA(&ID); }
+
+  // ObjectFile Protocol.
+  bool ParseHeader() override;
+
+  bool SetLoadAddress(lldb_private::Target &target, lldb::addr_t value,
+                      bool value_is_offset) override;
+
+  lldb::ByteOrder GetByteOrder() const override;
+
+  bool IsExecutable() const override;
+
+  uint32_t GetAddressByteSize() const override;
+
+  lldb_private::AddressClass GetAddressClass(lldb::addr_t file_addr) override;
+
+  lldb_private::Symtab *GetSymtab() override;
+
+  bool IsStripped() override;
+
+  void CreateSections(lldb_private::SectionList &unified_section_list) override;
+
+  void Dump(lldb_private::Stream *s) override;
+
+  lldb_private::ArchSpec GetArchitecture() override;
+
+  lldb_private::UUID GetUUID() override;
+
+  /// Return the contents of the .gnu_debuglink section, if the object file
+  /// contains it. 
+  llvm::Optional<lldb_private::FileSpec> GetDebugLink();
+
+  uint32_t GetDependentModules(lldb_private::FileSpecList &files) override;
+
+  lldb_private::Address
+  GetImageInfoAddress(lldb_private::Target *target) override;
+
+  lldb_private::Address GetEntryPointAddress() override;
+
+  lldb_private::Address GetBaseAddress() override;
+
+  ObjectFile::Type CalculateType() override;
+
+  ObjectFile::Strata CalculateStrata() override;
+
+  size_t ReadSectionData(lldb_private::Section *section,
+                         lldb::offset_t section_offset, void *dst,
+                         size_t dst_len) override;
+
+  size_t ReadSectionData(lldb_private::Section *section,
+                         lldb_private::DataExtractor &section_data) override;
+
+  llvm::ArrayRef<elf::ELFProgramHeader> ProgramHeaders();
+  lldb_private::DataExtractor GetSegmentData(const elf::ELFProgramHeader &H);
+
+  llvm::StringRef
+  StripLinkerSymbolAnnotations(llvm::StringRef symbol_name) const override;
+
+  void RelocateSection(lldb_private::Section *section) override;
+
+protected:
+
+  std::vector<LoadableData>
+  GetLoadableData(lldb_private::Target &target) override;
+
+private:
+  ObjectFileELF(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
+                lldb::offset_t data_offset, const lldb_private::FileSpec *file,
+                lldb::offset_t offset, lldb::offset_t length);
+
+  ObjectFileELF(const lldb::ModuleSP &module_sp,
+                lldb::DataBufferSP &header_data_sp,
+                const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
+
+  typedef std::vector<elf::ELFProgramHeader> ProgramHeaderColl;
+
+  struct ELFSectionHeaderInfo : public elf::ELFSectionHeader {
+    lldb_private::ConstString section_name;
+  };
+
+  typedef std::vector<ELFSectionHeaderInfo> SectionHeaderColl;
+  typedef SectionHeaderColl::iterator SectionHeaderCollIter;
+  typedef SectionHeaderColl::const_iterator SectionHeaderCollConstIter;
+
+  typedef std::vector<elf::ELFDynamic> DynamicSymbolColl;
+  typedef DynamicSymbolColl::iterator DynamicSymbolCollIter;
+  typedef DynamicSymbolColl::const_iterator DynamicSymbolCollConstIter;
+
+  typedef std::map<lldb::addr_t, lldb_private::AddressClass>
+      FileAddressToAddressClassMap;
+
+  /// Version of this reader common to all plugins based on this class.
+  static const uint32_t m_plugin_version = 1;
+  static const uint32_t g_core_uuid_magic;
+
+  /// ELF file header.
+  elf::ELFHeader m_header;
+
+  /// ELF build ID.
+  lldb_private::UUID m_uuid;
+
+  /// ELF .gnu_debuglink file and crc data if available.
+  std::string m_gnu_debuglink_file;
+  uint32_t m_gnu_debuglink_crc = 0;
+
+  /// Collection of program headers.
+  ProgramHeaderColl m_program_headers;
+
+  /// Collection of section headers.
+  SectionHeaderColl m_section_headers;
+
+  /// Collection of symbols from the dynamic table.
+  DynamicSymbolColl m_dynamic_symbols;
+
+  /// Object file parsed from .gnu_debugdata section (\sa
+  /// GetGnuDebugDataObjectFile())
+  std::shared_ptr<ObjectFileELF> m_gnu_debug_data_object_file;
+
+  /// List of file specifications corresponding to the modules (shared
+  /// libraries) on which this object file depends.
+  mutable std::unique_ptr<lldb_private::FileSpecList> m_filespec_up;
+
+  /// Cached value of the entry point for this module.
+  lldb_private::Address m_entry_point_address;
+
+  /// The architecture detected from parsing elf file contents.
+  lldb_private::ArchSpec m_arch_spec;
+
+  /// The address class for each symbol in the elf file
+  FileAddressToAddressClassMap m_address_class_map;
+
+  /// Returns the index of the given section header.
+  size_t SectionIndex(const SectionHeaderCollIter &I);
+
+  /// Returns the index of the given section header.
+  size_t SectionIndex(const SectionHeaderCollConstIter &I) const;
+
+  // Parses the ELF program headers.
+  static size_t GetProgramHeaderInfo(ProgramHeaderColl &program_headers,
+                                     lldb_private::DataExtractor &object_data,
+                                     const elf::ELFHeader &header);
+
+  // Finds PT_NOTE segments and calculates their crc sum.
+  static uint32_t
+  CalculateELFNotesSegmentsCRC32(const ProgramHeaderColl &program_headers,
+                                 lldb_private::DataExtractor &data);
+
+  /// Parses all section headers present in this object file and populates
+  /// m_program_headers.  This method will compute the header list only once.
+  /// Returns true iff the headers have been successfully parsed.
+  bool ParseProgramHeaders();
+
+  /// Parses all section headers present in this object file and populates
+  /// m_section_headers.  This method will compute the header list only once.
+  /// Returns the number of headers parsed.
+  size_t ParseSectionHeaders();
+
+  lldb::SectionType GetSectionType(const ELFSectionHeaderInfo &H) const;
+
+  static void ParseARMAttributes(lldb_private::DataExtractor &data,
+                                 uint64_t length,
+                                 lldb_private::ArchSpec &arch_spec);
+
+  /// Parses the elf section headers and returns the uuid, debug link name,
+  /// crc, archspec.
+  static size_t GetSectionHeaderInfo(SectionHeaderColl &section_headers,
+                                     lldb_private::DataExtractor &object_data,
+                                     const elf::ELFHeader &header,
+                                     lldb_private::UUID &uuid,
+                                     std::string &gnu_debuglink_file,
+                                     uint32_t &gnu_debuglink_crc,
+                                     lldb_private::ArchSpec &arch_spec);
+
+  /// Scans the dynamic section and locates all dependent modules (shared
+  /// libraries) populating m_filespec_up.  This method will compute the
+  /// dependent module list only once.  Returns the number of dependent
+  /// modules parsed.
+  size_t ParseDependentModules();
+
+  /// Parses the dynamic symbol table and populates m_dynamic_symbols.  The
+  /// vector retains the order as found in the object file.  Returns the
+  /// number of dynamic symbols parsed.
+  size_t ParseDynamicSymbols();
+
+  /// Populates m_symtab_up will all non-dynamic linker symbols.  This method
+  /// will parse the symbols only once.  Returns the number of symbols parsed.
+  unsigned ParseSymbolTable(lldb_private::Symtab *symbol_table,
+                            lldb::user_id_t start_id,
+                            lldb_private::Section *symtab);
+
+  /// Helper routine for ParseSymbolTable().
+  unsigned ParseSymbols(lldb_private::Symtab *symbol_table,
+                        lldb::user_id_t start_id,
+                        lldb_private::SectionList *section_list,
+                        const size_t num_symbols,
+                        const lldb_private::DataExtractor &symtab_data,
+                        const lldb_private::DataExtractor &strtab_data);
+
+  /// Scans the relocation entries and adds a set of artificial symbols to the
+  /// given symbol table for each PLT slot.  Returns the number of symbols
+  /// added.
+  unsigned ParseTrampolineSymbols(lldb_private::Symtab *symbol_table,
+                                  lldb::user_id_t start_id,
+                                  const ELFSectionHeaderInfo *rela_hdr,
+                                  lldb::user_id_t section_id);
+
+  void ParseUnwindSymbols(lldb_private::Symtab *symbol_table,
+                          lldb_private::DWARFCallFrameInfo *eh_frame);
+
+  /// Relocates debug sections
+  unsigned RelocateDebugSections(const elf::ELFSectionHeader *rel_hdr,
+                                 lldb::user_id_t rel_id,
+                                 lldb_private::Symtab *thetab);
+
+  unsigned ApplyRelocations(lldb_private::Symtab *symtab,
+                            const elf::ELFHeader *hdr,
+                            const elf::ELFSectionHeader *rel_hdr,
+                            const elf::ELFSectionHeader *symtab_hdr,
+                            const elf::ELFSectionHeader *debug_hdr,
+                            lldb_private::DataExtractor &rel_data,
+                            lldb_private::DataExtractor &symtab_data,
+                            lldb_private::DataExtractor &debug_data,
+                            lldb_private::Section *rel_section);
+
+  /// Loads the section name string table into m_shstr_data.  Returns the
+  /// number of bytes constituting the table.
+  size_t GetSectionHeaderStringTable();
+
+  /// Utility method for looking up a section given its name.  Returns the
+  /// index of the corresponding section or zero if no section with the given
+  /// name can be found (note that section indices are always 1 based, and so
+  /// section index 0 is never valid).
+  lldb::user_id_t GetSectionIndexByName(const char *name);
+
+  // Returns the ID of the first section that has the given type.
+  lldb::user_id_t GetSectionIndexByType(unsigned type);
+
+  /// Returns the section header with the given id or NULL.
+  const ELFSectionHeaderInfo *GetSectionHeaderByIndex(lldb::user_id_t id);
+
+  /// \name  ELF header dump routines
+  //@{
+  static void DumpELFHeader(lldb_private::Stream *s,
+                            const elf::ELFHeader &header);
+
+  static void DumpELFHeader_e_ident_EI_DATA(lldb_private::Stream *s,
+                                            unsigned char ei_data);
+
+  static void DumpELFHeader_e_type(lldb_private::Stream *s,
+                                   elf::elf_half e_type);
+  //@}
+
+  /// \name ELF program header dump routines
+  //@{
+  void DumpELFProgramHeaders(lldb_private::Stream *s);
+
+  static void DumpELFProgramHeader(lldb_private::Stream *s,
+                                   const elf::ELFProgramHeader &ph);
+
+  static void DumpELFProgramHeader_p_type(lldb_private::Stream *s,
+                                          elf::elf_word p_type);
+
+  static void DumpELFProgramHeader_p_flags(lldb_private::Stream *s,
+                                           elf::elf_word p_flags);
+  //@}
+
+  /// \name ELF section header dump routines
+  //@{
+  void DumpELFSectionHeaders(lldb_private::Stream *s);
+
+  static void DumpELFSectionHeader(lldb_private::Stream *s,
+                                   const ELFSectionHeaderInfo &sh);
+
+  static void DumpELFSectionHeader_sh_type(lldb_private::Stream *s,
+                                           elf::elf_word sh_type);
+
+  static void DumpELFSectionHeader_sh_flags(lldb_private::Stream *s,
+                                            elf::elf_xword sh_flags);
+  //@}
+
+  /// ELF dependent module dump routine.
+  void DumpDependentModules(lldb_private::Stream *s);
+
+  const elf::ELFDynamic *FindDynamicSymbol(unsigned tag);
+
+  unsigned PLTRelocationType();
+
+  static lldb_private::Status
+  RefineModuleDetailsFromNote(lldb_private::DataExtractor &data,
+                              lldb_private::ArchSpec &arch_spec,
+                              lldb_private::UUID &uuid);
+
+  bool AnySegmentHasPhysicalAddress();
+  
+  /// Takes the .gnu_debugdata and returns the decompressed object file that is
+  /// stored within that section.
+  ///
+  /// \returns either the decompressed object file stored within the
+  /// .gnu_debugdata section or \c nullptr if an error occured or if there's no
+  /// section with that name.
+  std::shared_ptr<ObjectFileELF> GetGnuDebugDataObjectFile();
+};
+
+#endif // liblldb_ObjectFileELF_h_