07580ffe47
when it and the inferior process both have the same shared cache (a conglomeration of all libraries at the same fixed address for all processes), lldb will read data out of its own memory to speed things up. The shared cache has a UUID, so lldb currently checks that the UUID of its own shared cache matches that of the inferior. This change adds one refinement to that -- it checks that the UUID is the same and that the base address of the shared cache is the same. And only uses its local shared cache if they are both identical. This involved using a different style of SPI with dyld to get lldb's shared cache load address, but it's not especially difficult. One unattractive part of the change is that I'm using the real underlying types of task_t and kern_return_t instead of picking them up from mach/mach.h. The defines that get picked up there (a lot from machine.h but others too) conflict with llvm/Support/MachO.h even when I have mach.h included before our SafeMachO.h which undefines most of the defines before including llvm/Support/MachO.h. I'll need to augment the #undefs in SafeMachO.h to get this to compile cleanly, but that'll be another day. <rdar://problem/39868238> llvm-svn: 331497
223 lines
8.7 KiB
C++
223 lines
8.7 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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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Core/Address.h"
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#include "lldb/Core/FileSpecList.h"
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#include "lldb/Core/RangeMap.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/SafeMachO.h"
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#include "lldb/Utility/UUID.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 : public lldb_private::ObjectFile {
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public:
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ObjectFileMachO(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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lldb::offset_t data_offset,
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const lldb_private::FileSpec *file, lldb::offset_t offset,
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lldb::offset_t length);
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ObjectFileMachO(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
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~ObjectFileMachO() override = default;
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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static void Initialize();
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static void Terminate();
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static lldb_private::ConstString GetPluginNameStatic();
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static const char *GetPluginDescriptionStatic();
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static lldb_private::ObjectFile *
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CreateInstance(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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lldb::offset_t data_offset, const lldb_private::FileSpec *file,
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lldb::offset_t file_offset, lldb::offset_t length);
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static lldb_private::ObjectFile *CreateMemoryInstance(
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const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
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const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
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static size_t GetModuleSpecifications(const lldb_private::FileSpec &file,
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lldb::DataBufferSP &data_sp,
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lldb::offset_t data_offset,
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lldb::offset_t file_offset,
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lldb::offset_t length,
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lldb_private::ModuleSpecList &specs);
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static bool SaveCore(const lldb::ProcessSP &process_sp,
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const lldb_private::FileSpec &outfile,
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lldb_private::Status &error);
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static bool MagicBytesMatch(lldb::DataBufferSP &data_sp, 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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bool ParseHeader() override;
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bool SetLoadAddress(lldb_private::Target &target, lldb::addr_t value,
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bool value_is_offset) override;
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lldb::ByteOrder GetByteOrder() const override;
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bool IsExecutable() const override;
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uint32_t GetAddressByteSize() const override;
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lldb::AddressClass GetAddressClass(lldb::addr_t file_addr) override;
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lldb_private::Symtab *GetSymtab() override;
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bool IsStripped() override;
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void CreateSections(lldb_private::SectionList &unified_section_list) override;
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void Dump(lldb_private::Stream *s) override;
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bool GetArchitecture(lldb_private::ArchSpec &arch) override;
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bool GetUUID(lldb_private::UUID *uuid) override;
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uint32_t GetDependentModules(lldb_private::FileSpecList &files) override;
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lldb_private::FileSpecList GetReExportedLibraries() override {
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return m_reexported_dylibs;
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}
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lldb_private::Address GetEntryPointAddress() override;
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lldb_private::Address GetHeaderAddress() override;
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uint32_t GetNumThreadContexts() override;
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std::string GetIdentifierString() override;
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bool GetCorefileMainBinaryInfo (lldb::addr_t &address, lldb_private::UUID &uuid) override;
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lldb::RegisterContextSP
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GetThreadContextAtIndex(uint32_t idx, lldb_private::Thread &thread) override;
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ObjectFile::Type CalculateType() override;
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ObjectFile::Strata CalculateStrata() override;
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uint32_t GetVersion(uint32_t *versions, uint32_t num_versions) override;
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uint32_t GetMinimumOSVersion(uint32_t *versions,
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uint32_t num_versions) override;
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uint32_t GetSDKVersion(uint32_t *versions, uint32_t num_versions) override;
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bool GetIsDynamicLinkEditor() override;
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static bool ParseHeader(lldb_private::DataExtractor &data,
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lldb::offset_t *data_offset_ptr,
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llvm::MachO::mach_header &header);
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bool AllowAssemblyEmulationUnwindPlans() override;
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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lldb_private::ConstString GetPluginName() override;
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uint32_t GetPluginVersion() override;
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protected:
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static bool
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GetUUID(const llvm::MachO::mach_header &header,
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const lldb_private::DataExtractor &data,
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lldb::offset_t lc_offset, // Offset to the first load command
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lldb_private::UUID &uuid);
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static bool GetArchitecture(const llvm::MachO::mach_header &header,
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const lldb_private::DataExtractor &data,
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lldb::offset_t lc_offset,
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lldb_private::ArchSpec &arch);
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// Intended for same-host arm device debugging where lldb needs to
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// detect libraries in the shared cache and augment the nlist entries
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// with an on-disk dyld_shared_cache file. The process will record
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// the shared cache UUID so the on-disk cache can be matched or rejected
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// correctly.
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void GetProcessSharedCacheUUID(lldb_private::Process *, lldb::addr_t &base_addr, lldb_private::UUID &uuid);
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// Intended for same-host arm device debugging where lldb will read
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// shared cache libraries out of its own memory instead of the remote
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// process' memory as an optimization. If lldb's shared cache UUID
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// does not match the process' shared cache UUID, this optimization
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// should not be used.
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void GetLLDBSharedCacheUUID(lldb::addr_t &base_addir, lldb_private::UUID &uuid);
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lldb_private::Section *GetMachHeaderSection();
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lldb::addr_t CalculateSectionLoadAddressForMemoryImage(
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lldb::addr_t mach_header_load_address,
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const lldb_private::Section *mach_header_section,
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const lldb_private::Section *section);
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lldb_private::UUID
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GetSharedCacheUUID(lldb_private::FileSpec dyld_shared_cache,
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const lldb::ByteOrder byte_order,
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const uint32_t addr_byte_size);
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size_t ParseSymtab();
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typedef lldb_private::RangeArray<uint32_t, uint32_t, 8> EncryptedFileRanges;
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EncryptedFileRanges GetEncryptedFileRanges();
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struct SegmentParsingContext;
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void ProcessDysymtabCommand(const llvm::MachO::load_command &load_cmd,
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lldb::offset_t offset);
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void ProcessSegmentCommand(const llvm::MachO::load_command &load_cmd,
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lldb::offset_t offset, uint32_t cmd_idx,
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SegmentParsingContext &context);
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void SanitizeSegmentCommand(llvm::MachO::segment_command_64 &seg_cmd,
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uint32_t cmd_idx);
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llvm::MachO::mach_header m_header;
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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 &GetSegmentNameDATA_DIRTY();
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static const lldb_private::ConstString &GetSegmentNameDATA_CONST();
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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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std::vector<uint32_t> m_min_os_versions;
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std::vector<uint32_t> m_sdk_versions;
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typedef lldb_private::RangeVector<uint32_t, uint32_t> 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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lldb_private::FileSpecList m_reexported_dylibs;
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bool m_allow_assembly_emulation_unwind_plans;
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};
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#endif // liblldb_ObjectFileMachO_h_
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