499b40e8a7
When populating symbol tables ObjectFileELF now generates a set of synthetic trampoline symbols. These new symbols correspond to entries in the program linkage table and have a (possibly mangled) name identifying the corresponding symbol in some DSO. These symbols will be used by the DynamicLoader loader plugin on Linux to provide thread plans when execution flows from one DSO to another. llvm-svn: 128550
291 lines
9.1 KiB
C++
291 lines
9.1 KiB
C++
//===-- ObjectFileELF.h --------------------------------------- -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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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 liblldb_ObjectFileELF_h_
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#define liblldb_ObjectFileELF_h_
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#include <stdint.h>
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#include <vector>
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#include "lldb/lldb-private.h"
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#include "lldb/Host/FileSpec.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "ELFHeader.h"
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//------------------------------------------------------------------------------
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/// @class ObjectFileELF
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/// @brief Generic ELF object file reader.
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///
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/// This class provides a generic ELF (32/64 bit) reader plugin implementing the
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/// ObjectFile protocol.
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class ObjectFileELF :
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public lldb_private::ObjectFile
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{
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public:
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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static void
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Initialize();
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static void
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Terminate();
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static const char *
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GetPluginNameStatic();
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static const char *
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GetPluginDescriptionStatic();
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static lldb_private::ObjectFile *
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CreateInstance(lldb_private::Module* module,
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lldb::DataBufferSP& dataSP,
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const lldb_private::FileSpec* file,
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lldb::addr_t offset,
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lldb::addr_t length);
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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virtual const char *
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GetPluginName();
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virtual const char *
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GetShortPluginName();
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virtual uint32_t
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GetPluginVersion();
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//------------------------------------------------------------------
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// ObjectFile Protocol.
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//------------------------------------------------------------------
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virtual
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~ObjectFileELF();
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virtual bool
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ParseHeader();
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virtual lldb::ByteOrder
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GetByteOrder() const;
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virtual bool
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IsExecutable () const;
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virtual size_t
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GetAddressByteSize() const;
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virtual lldb_private::Symtab *
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GetSymtab();
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virtual lldb_private::SectionList *
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GetSectionList();
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virtual void
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Dump(lldb_private::Stream *s);
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virtual bool
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GetArchitecture (lldb_private::ArchSpec &arch);
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virtual bool
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GetUUID(lldb_private::UUID* uuid);
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virtual uint32_t
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GetDependentModules(lldb_private::FileSpecList& files);
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virtual lldb_private::Address
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GetImageInfoAddress();
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virtual lldb_private::Address
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GetEntryPointAddress ();
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private:
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ObjectFileELF(lldb_private::Module* module,
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lldb::DataBufferSP& dataSP,
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const lldb_private::FileSpec* file,
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lldb::addr_t offset,
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lldb::addr_t length);
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typedef std::vector<elf::ELFProgramHeader> ProgramHeaderColl;
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typedef ProgramHeaderColl::iterator ProgramHeaderCollIter;
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typedef ProgramHeaderColl::const_iterator ProgramHeaderCollConstIter;
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typedef std::vector<elf::ELFSectionHeader> SectionHeaderColl;
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typedef SectionHeaderColl::iterator SectionHeaderCollIter;
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typedef SectionHeaderColl::const_iterator SectionHeaderCollConstIter;
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typedef std::vector<elf::ELFDynamic> DynamicSymbolColl;
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typedef DynamicSymbolColl::iterator DynamicSymbolCollIter;
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typedef DynamicSymbolColl::const_iterator DynamicSymbolCollConstIter;
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/// Version of this reader common to all plugins based on this class.
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static const uint32_t m_plugin_version = 1;
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/// ELF file header.
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elf::ELFHeader m_header;
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/// Collection of program headers.
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ProgramHeaderColl m_program_headers;
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/// Collection of section headers.
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SectionHeaderColl m_section_headers;
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/// Collection of symbols from the dynamic table.
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DynamicSymbolColl m_dynamic_symbols;
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/// List of sections present in this ELF object file.
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mutable std::auto_ptr<lldb_private::SectionList> m_sections_ap;
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/// Table of all non-dynamic symbols present in this object file.
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mutable std::auto_ptr<lldb_private::Symtab> m_symtab_ap;
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/// List of file specifications corresponding to the modules (shared
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/// libraries) on which this object file depends.
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mutable std::auto_ptr<lldb_private::FileSpecList> m_filespec_ap;
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/// Data extractor holding the string table used to resolve section names.
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lldb_private::DataExtractor m_shstr_data;
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/// Cached value of the entry point for this module.
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lldb_private::Address m_entry_point_address;
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/// Returns a 1 based index of the given section header.
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unsigned
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SectionIndex(const SectionHeaderCollIter &I);
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/// Returns a 1 based index of the given section header.
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unsigned
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SectionIndex(const SectionHeaderCollConstIter &I) const;
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/// Parses all section headers present in this object file and populates
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/// m_program_headers. This method will compute the header list only once.
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/// Returns the number of headers parsed.
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size_t
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ParseProgramHeaders();
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/// Parses all section headers present in this object file and populates
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/// m_section_headers. This method will compute the header list only once.
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/// Returns the number of headers parsed.
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size_t
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ParseSectionHeaders();
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/// Scans the dynamic section and locates all dependent modules (shared
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/// libraries) populating m_filespec_ap. This method will compute the
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/// dependent module list only once. Returns the number of dependent
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/// modules parsed.
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size_t
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ParseDependentModules();
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/// Parses the dynamic symbol table and populates m_dynamic_symbols. The
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/// vector retains the order as found in the object file. Returns the
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/// number of dynamic symbols parsed.
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size_t
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ParseDynamicSymbols();
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/// Populates m_symtab_ap will all non-dynamic linker symbols. This method
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/// will parse the symbols only once. Returns the number of symbols parsed.
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unsigned
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ParseSymbolTable(lldb_private::Symtab *symbol_table,
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lldb::user_id_t start_id,
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const elf::ELFSectionHeader *symtab_section,
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lldb::user_id_t symtab_id);
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/// Scans the relocation entries and adds a set of artificial symbols to the
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/// given symbol table for each PLT slot. Returns the number of symbols
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/// added.
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unsigned
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ParseTrampolineSymbols(lldb_private::Symtab *symbol_table,
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lldb::user_id_t start_id,
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const elf::ELFSectionHeader *rela_hdr,
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lldb::user_id_t section_id);
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/// Loads the section name string table into m_shstr_data. Returns the
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/// number of bytes constituting the table.
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size_t
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GetSectionHeaderStringTable();
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/// Utility method for looking up a section given its name. Returns the
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/// index of the corresponding section or zero if no section with the given
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/// name can be found (note that section indices are always 1 based, and so
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/// section index 0 is never valid).
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lldb::user_id_t
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GetSectionIndexByName(const char *name);
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// Returns the ID of the first section that has the given type.
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lldb::user_id_t
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GetSectionIndexByType(unsigned type);
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/// Returns the section header with the given id or NULL.
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const elf::ELFSectionHeader *
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GetSectionHeaderByIndex(lldb::user_id_t id);
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/// @name ELF header dump routines
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//@{
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static void
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DumpELFHeader(lldb_private::Stream *s, const elf::ELFHeader& header);
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static void
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DumpELFHeader_e_ident_EI_DATA(lldb_private::Stream *s,
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unsigned char ei_data);
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static void
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DumpELFHeader_e_type(lldb_private::Stream *s, elf::elf_half e_type);
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//@}
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/// @name ELF program header dump routines
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//@{
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void
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DumpELFProgramHeaders(lldb_private::Stream *s);
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static void
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DumpELFProgramHeader(lldb_private::Stream *s,
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const elf::ELFProgramHeader &ph);
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static void
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DumpELFProgramHeader_p_type(lldb_private::Stream *s, elf::elf_word p_type);
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static void
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DumpELFProgramHeader_p_flags(lldb_private::Stream *s,
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elf::elf_word p_flags);
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//@}
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/// @name ELF section header dump routines
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//@{
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void
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DumpELFSectionHeaders(lldb_private::Stream *s);
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static void
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DumpELFSectionHeader(lldb_private::Stream *s,
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const elf::ELFSectionHeader& sh);
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static void
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DumpELFSectionHeader_sh_type(lldb_private::Stream *s,
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elf::elf_word sh_type);
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static void
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DumpELFSectionHeader_sh_flags(lldb_private::Stream *s,
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elf::elf_word sh_flags);
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//@}
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/// ELF dependent module dump routine.
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void
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DumpDependentModules(lldb_private::Stream *s);
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const elf::ELFDynamic *
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FindDynamicSymbol(unsigned tag);
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lldb_private::Section *
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PLTSection();
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unsigned
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PLTRelocationType();
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};
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#endif // #ifndef liblldb_ObjectFileELF_h_
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