a174349960
Simplify the locking strategy for Module and its owned objects to always use the Module's mutex to avoid A/B deadlocks. We had a case where a symbol vendor was locking itself and then calling a function that would try to get it's Module's mutex and at the same time another thread had the Module mutex that was trying to get the SymbolVendor mutex. Now any classes that inherit from ModuleChild should use the module lock using code like:
void
ModuleChildSubclass::Function
{
ModuleSP module_sp(GetModule());
if (module_sp)
{
lldb_private::Mutex::Locker locker(module_sp->GetMutex());
... do work here...
}
}
This will help avoid deadlocks by using as few locks as possible for a module and all its child objects and also enforce detecting if a module has gone away (the ModuleSP will be returned empty if the weak_ptr does refer to a valid object anymore).
llvm-svn: 152679
172 lines
5.0 KiB
C++
172 lines
5.0 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& 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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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& dataSP,
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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& 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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ObjectFileMachO (const lldb::ModuleSP &module_sp,
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lldb::DataBufferSP& dataSP,
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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 size_t
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GetAddressByteSize () const;
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virtual lldb_private::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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