5ce9c5657c
lldb was mmap'ing archive files once per .o file it loads, now it correctly shares the archive between modules. LLDB was also always mapping entire contents of universal mach-o files, now it maps just the slice that is required. Added a new logging channel for "lldb" called "mmap" to help track future regressions. Modified the ObjectFile and ObjectContainer plugin interfaces to take a data offset along with the file offset and size so we can implement the correct caching and efficient reading of parts of files without mmap'ing the entire file like we used to. The current implementation still keeps entire .a files mmaped (once) and entire slices from universal files mmaped to ensure that if a client builds their binaries during a debug session we don't lose our data and get corrupt object file info and debug info. llvm-svn: 174524
174 lines
5.1 KiB
C++
174 lines
5.1 KiB
C++
//===-- ObjectFileMachO.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_ObjectFileMachO_h_
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#define liblldb_ObjectFileMachO_h_
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#include "llvm/Support/MachO.h"
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#include "lldb/Core/Address.h"
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#include "lldb/Core/RangeMap.h"
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#include "lldb/Host/FileSpec.h"
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#include "lldb/Host/Mutex.h"
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#include "lldb/Symbol/ObjectFile.h"
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//----------------------------------------------------------------------
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// This class needs to be hidden as eventually belongs in a plugin that
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// will export the ObjectFile protocol
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//----------------------------------------------------------------------
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class ObjectFileMachO :
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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 (const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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lldb::offset_t data_offset,
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const lldb_private::FileSpec* file,
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lldb::offset_t file_offset,
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lldb::offset_t length);
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static lldb_private::ObjectFile *
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CreateMemoryInstance (const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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const lldb::ProcessSP &process_sp,
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lldb::addr_t header_addr);
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static bool
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MagicBytesMatch (lldb::DataBufferSP& data_sp,
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lldb::addr_t offset,
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lldb::addr_t length);
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//------------------------------------------------------------------
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// Member Functions
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//------------------------------------------------------------------
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ObjectFileMachO (const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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lldb::offset_t data_offset,
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const lldb_private::FileSpec* file,
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lldb::offset_t offset,
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lldb::offset_t length);
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ObjectFileMachO (const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& data_sp,
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const lldb::ProcessSP &process_sp,
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lldb::addr_t header_addr);
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virtual
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~ObjectFileMachO();
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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 uint32_t
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GetAddressByteSize () const;
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virtual lldb::AddressClass
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GetAddressClass (lldb::addr_t file_addr);
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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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//------------------------------------------------------------------
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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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virtual lldb_private::Address
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GetEntryPointAddress ();
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virtual lldb_private::Address
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GetHeaderAddress ();
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virtual uint32_t
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GetNumThreadContexts ();
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virtual lldb::RegisterContextSP
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GetThreadContextAtIndex (uint32_t idx, lldb_private::Thread &thread);
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virtual ObjectFile::Type
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CalculateType();
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virtual ObjectFile::Strata
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CalculateStrata();
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virtual uint32_t
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GetVersion (uint32_t *versions, uint32_t num_versions);
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protected:
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llvm::MachO::mach_header m_header;
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mutable std::auto_ptr<lldb_private::SectionList> m_sections_ap;
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mutable std::auto_ptr<lldb_private::Symtab> m_symtab_ap;
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static const lldb_private::ConstString &GetSegmentNameTEXT();
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static const lldb_private::ConstString &GetSegmentNameDATA();
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static const lldb_private::ConstString &GetSegmentNameOBJC();
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static const lldb_private::ConstString &GetSegmentNameLINKEDIT();
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static const lldb_private::ConstString &GetSectionNameEHFrame();
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llvm::MachO::dysymtab_command m_dysymtab;
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std::vector<llvm::MachO::segment_command_64> m_mach_segments;
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std::vector<llvm::MachO::section_64> m_mach_sections;
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typedef lldb_private::RangeArray<uint32_t, uint32_t, 1> FileRangeArray;
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lldb_private::Address m_entry_point_address;
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FileRangeArray m_thread_context_offsets;
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bool m_thread_context_offsets_valid;
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size_t
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ParseSections ();
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size_t
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ParseSymtab (bool minimize);
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};
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#endif // liblldb_ObjectFileMachO_h_
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