C++ ArchSpec::IsValid方法代码示例

bool
PlatformWindows::GetSupportedArchitectureAtIndex (uint32_t idx, ArchSpec &arch)
{
    // From macosx;s plugin code. For FreeBSD we may want to support more archs.
    if (idx == 0)
    {
        arch = Host::GetArchitecture (Host::eSystemDefaultArchitecture);
        return arch.IsValid();
    }
    else if (idx == 1)
    {
        ArchSpec platform_arch (Host::GetArchitecture (Host::eSystemDefaultArchitecture));
        ArchSpec platform_arch64 (Host::GetArchitecture (Host::eSystemDefaultArchitecture64));
        if (platform_arch.IsExactMatch(platform_arch64))
        {
            // This freebsd platform supports both 32 and 64 bit. Since we already
            // returned the 64 bit arch for idx == 0, return the 32 bit arch
            // for idx == 1
            arch = Host::GetArchitecture (Host::eSystemDefaultArchitecture32);
            return arch.IsValid();
        }
    }
    return false;
}

bool
PlatformAppleWatchSimulator::GetSupportedArchitectureAtIndex (uint32_t idx, ArchSpec &arch)
{
    static const ArchSpec platform_arch(HostInfo::GetArchitecture(HostInfo::eArchKind64));

    if (idx == 0)
    {
        arch = platform_arch;
        if (arch.IsValid())
        {
            arch.GetTriple().setOS (llvm::Triple::WatchOS);
            return true;
        }
    }
    return false;
}

bool PlatformOpenBSD::GetSupportedArchitectureAtIndex(uint32_t idx,
                                                      ArchSpec &arch) {
  if (IsHost()) {
    ArchSpec hostArch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
    if (hostArch.GetTriple().isOSOpenBSD()) {
      if (idx == 0) {
        arch = hostArch;
        return arch.IsValid();
      }
    }
  } else {
    if (m_remote_platform_sp)
      return m_remote_platform_sp->GetSupportedArchitectureAtIndex(idx, arch);

    llvm::Triple triple;
    // Set the OS to OpenBSD
    triple.setOS(llvm::Triple::OpenBSD);
    // Set the architecture
    switch (idx) {
    case 0:
      triple.setArchName("x86_64");
      break;
    case 1:
      triple.setArchName("i386");
      break;
    case 2:
      triple.setArchName("aarch64");
      break;
    case 3:
      triple.setArchName("arm");
      break;
    default:
      return false;
    }
    // Leave the vendor as "llvm::Triple:UnknownVendor" and don't specify the
    // vendor by calling triple.SetVendorName("unknown") so that it is a
    // "unspecified unknown". This means when someone calls
    // triple.GetVendorName() it will return an empty string which indicates
    // that the vendor can be set when two architectures are merged

    // Now set the triple into "arch" and return true
    arch.SetTriple(triple);
    return true;
  }
  return false;
}

void
Platform::GetStatus (Stream &strm)
{
    uint32_t major = UINT32_MAX;
    uint32_t minor = UINT32_MAX;
    uint32_t update = UINT32_MAX;
    std::string s;
    strm.Printf ("  Platform: %s\n", GetShortPluginName());

    ArchSpec arch (GetSystemArchitecture());
    if (arch.IsValid())
    {
        if (!arch.GetTriple().str().empty())
        strm.Printf("    Triple: %s\n", arch.GetTriple().str().c_str());        
    }

    if (GetOSVersion(major, minor, update))
    {
        strm.Printf("OS Version: %u", major);
        if (minor != UINT32_MAX)
            strm.Printf(".%u", minor);
        if (update != UINT32_MAX)
            strm.Printf(".%u", update);

        if (GetOSBuildString (s))
            strm.Printf(" (%s)", s.c_str());

        strm.EOL();
    }

    if (GetOSKernelDescription (s))
        strm.Printf("    Kernel: %s\n", s.c_str());

    if (IsHost())
    {
        strm.Printf("  Hostname: %s\n", GetHostname());
    }
    else
    {
        const bool is_connected = IsConnected();
        if (is_connected)
            strm.Printf("  Hostname: %s\n", GetHostname());
        strm.Printf(" Connected: %s\n", is_connected ? "yes" : "no");
    }
}

ObjectFileSP
ObjectContainerUniversalMachO::GetObjectFile(const FileSpec *file) {
  uint32_t arch_idx = 0;
  ArchSpec arch;
  // If the module hasn't specified an architecture yet, set it to the default
  // architecture:
  ModuleSP module_sp(GetModule());
  if (module_sp) {
    if (!module_sp->GetArchitecture().IsValid()) {
      arch = Target::GetDefaultArchitecture();
      if (!arch.IsValid())
        arch.SetTriple(LLDB_ARCH_DEFAULT);
    } else
      arch = module_sp->GetArchitecture();

    ArchSpec curr_arch;
    // First, try to find an exact match for the Arch of the Target.
    for (arch_idx = 0; arch_idx < m_header.nfat_arch; ++arch_idx) {
      if (GetArchitectureAtIndex(arch_idx, curr_arch) &&
          arch.IsExactMatch(curr_arch))
        break;
    }

    // Failing an exact match, try to find a compatible Arch of the Target.
    if (arch_idx >= m_header.nfat_arch) {
      for (arch_idx = 0; arch_idx < m_header.nfat_arch; ++arch_idx) {
        if (GetArchitectureAtIndex(arch_idx, curr_arch) &&
            arch.IsCompatibleMatch(curr_arch))
          break;
      }
    }

    if (arch_idx < m_header.nfat_arch) {
      DataBufferSP data_sp;
      lldb::offset_t data_offset = 0;
      return ObjectFile::FindPlugin(
          module_sp, file, m_offset + m_fat_archs[arch_idx].offset,
          m_fat_archs[arch_idx].size, data_sp, data_offset);
    }
  }
  return ObjectFileSP();
}

Error NativeProcessProtocol::ResolveProcessArchitecture(lldb::pid_t pid,
                                                        ArchSpec &arch) {
  // Grab process info for the running process.
  ProcessInstanceInfo process_info;
  if (!Host::GetProcessInfo(pid, process_info))
    return Error("failed to get process info");

  // Resolve the executable module.
  ModuleSpecList module_specs;
  if (!ObjectFile::GetModuleSpecifications(process_info.GetExecutableFile(), 0,
                                           0, module_specs))
    return Error("failed to get module specifications");
  lldbassert(module_specs.GetSize() == 1);

  arch = module_specs.GetModuleSpecRefAtIndex(0).GetArchitecture();
  if (arch.IsValid())
    return Error();
  else
    return Error("failed to retrieve a valid architecture from the exe module");
}

ObjectContainerBSDArchive::Archive::shared_ptr
ObjectContainerBSDArchive::Archive::FindCachedArchive (const FileSpec &file, const ArchSpec &arch, const TimeValue &time, lldb::offset_t file_offset)
{
    Mutex::Locker locker(Archive::GetArchiveCacheMutex ());
    shared_ptr archive_sp;
    Archive::Map &archive_map = Archive::GetArchiveCache ();
    Archive::Map::iterator pos = archive_map.find (file);
    // Don't cache a value for "archive_map.end()" below since we might
    // delete an archive entry...
    while (pos != archive_map.end() && pos->first == file)
    {
        bool match = true;
        if (arch.IsValid() && pos->second->GetArchitecture().IsCompatibleMatch(arch) == false)
            match = false;
        else if (file_offset != LLDB_INVALID_OFFSET && pos->second->GetFileOffset() != file_offset)
            match = false;
        if (match)
        {
            if (pos->second->GetModificationTime() == time)
            {
                return pos->second;
            }
            else
            {
                // We have a file at the same path with the same architecture
                // whose modification time doesn't match. It doesn't make sense
                // for us to continue to use this BSD archive since we cache only
                // the object info which consists of file time info and also the
                // file offset and file size of any contianed objects. Since
                // this information is now out of date, we won't get the correct
                // information if we go and extract the file data, so we should 
                // remove the old and outdated entry.
                archive_map.erase (pos);
                pos = archive_map.find (file);
                continue; // Continue to next iteration so we don't increment pos below...
            }
        }
        ++pos;
    }
    return archive_sp;
}

PlatformSP
Platform::Create (const ArchSpec &arch, ArchSpec *platform_arch_ptr, Error &error)
{
    lldb::PlatformSP platform_sp;
    if (arch.IsValid())
    {
        uint32_t idx;
        PlatformCreateInstance create_callback;
        // First try exact arch matches across all platform plug-ins
        bool exact = true;
        for (idx = 0; (create_callback = PluginManager::GetPlatformCreateCallbackAtIndex (idx)); ++idx)
        {
            if (create_callback)
            {
                platform_sp.reset(create_callback(false, &arch));
                if (platform_sp && platform_sp->IsCompatibleArchitecture(arch, exact, platform_arch_ptr))
                    return platform_sp;
            }
        }
        // Next try compatible arch matches across all platform plug-ins
        exact = false;
        for (idx = 0; (create_callback = PluginManager::GetPlatformCreateCallbackAtIndex (idx)); ++idx)
        {
            if (create_callback)
            {
                platform_sp.reset(create_callback(false, &arch));
                if (platform_sp && platform_sp->IsCompatibleArchitecture(arch, exact, platform_arch_ptr))
                    return platform_sp;
            }
        }
    }
    else
        error.SetErrorString ("invalid platform name");
    if (platform_arch_ptr)
        platform_arch_ptr->Clear();
    platform_sp.reset();
    return platform_sp;
}

Error
PlatformKalimba::ResolveExecutable (const FileSpec &exe_file,
                                  const ArchSpec &exe_arch,
                                  lldb::ModuleSP &exe_module_sp,
                                  const FileSpecList *module_search_paths_ptr)
{
    Error error;
    char exe_path[PATH_MAX];
    FileSpec resolved_exe_file (exe_file);

    if (!resolved_exe_file.Exists())
    {
        exe_file.GetPath(exe_path, sizeof(exe_path));
        error.SetErrorStringWithFormat("unable to find executable for '%s'", exe_path);
    }

    if (error.Success())
    {
        ModuleSpec module_spec (resolved_exe_file, exe_arch);
        if (exe_arch.IsValid())
        {
            error = ModuleList::GetSharedModule (module_spec, 
                                                 exe_module_sp, 
                                                 NULL, 
                                                 NULL,
                                                 NULL);
            if (error.Fail())
            {
                // If we failed, it may be because the vendor and os aren't known. If that is the
                // case, try setting them to the host architecture and give it another try.
                llvm::Triple &module_triple = module_spec.GetArchitecture().GetTriple(); 
                bool is_vendor_specified = (module_triple.getVendor() != llvm::Triple::UnknownVendor);
                bool is_os_specified = (module_triple.getOS() != llvm::Triple::UnknownOS);
                if (!is_vendor_specified || !is_os_specified)
                {
                    const llvm::Triple &host_triple = Host::GetArchitecture (Host::eSystemDefaultArchitecture).GetTriple();

                    if (!is_vendor_specified)
                        module_triple.setVendorName (host_triple.getVendorName());
                    if (!is_os_specified)
                        module_triple.setOSName (host_triple.getOSName());

                    error = ModuleList::GetSharedModule (module_spec, 
                                                         exe_module_sp, 
                                                         NULL, 
                                                         NULL,
                                                         NULL);
                }
            }
        
            // TODO find out why exe_module_sp might be NULL            
            if (!exe_module_sp || exe_module_sp->GetObjectFile() == NULL)
            {
                exe_module_sp.reset();
                error.SetErrorStringWithFormat ("'%s' doesn't contain the architecture %s",
                                                exe_file.GetPath().c_str(),
                                                exe_arch.GetArchitectureName());
            }
        }
        else
        {
            // No valid architecture was specified, ask the platform for
            // the architectures that we should be using (in the correct order)
            // and see if we can find a match that way
            StreamString arch_names;
            for (uint32_t idx = 0; GetSupportedArchitectureAtIndex (idx, module_spec.GetArchitecture()); ++idx)
            {
                error = ModuleList::GetSharedModule (module_spec, 
                                                     exe_module_sp, 
                                                     NULL, 
                                                     NULL,
                                                     NULL);
                // Did we find an executable using one of the 
                if (error.Success())
                {
                    if (exe_module_sp && exe_module_sp->GetObjectFile())
                        break;
                    else
                        error.SetErrorToGenericError();
                }
                
                if (idx > 0)
                    arch_names.PutCString (", ");
                arch_names.PutCString (module_spec.GetArchitecture().GetArchitectureName());
            }
            
            if (error.Fail() || !exe_module_sp)
            {
                error.SetErrorStringWithFormat ("'%s' doesn't contain any '%s' platform architectures: %s",
                                                exe_file.GetPath().c_str(),
                                                GetPluginName().GetCString(),
                                                arch_names.GetString().c_str());
            }
        }
    }

    return error;
}

//.........这里部分代码省略.........
    for (uint32_t i=0; i<num_sections; ++i)
    {
        Section *section = section_list->GetSectionAtIndex (i).get();
        if (section)
        {
            lldb::addr_t section_vm_addr = section->GetFileAddress();
            FileRange file_range (section->GetFileOffset(), section->GetFileSize());
            VMRangeToFileOffset::Entry range_entry (section_vm_addr,
                                                    section->GetByteSize(),
                                                    file_range);
            
            if (vm_addr > section_vm_addr)
                ranges_are_sorted = false;
            vm_addr = section->GetFileAddress();
            VMRangeToFileOffset::Entry *last_entry = m_core_aranges.Back();
//            printf ("LC_SEGMENT[%u] arange=[0x%16.16" PRIx64 " - 0x%16.16" PRIx64 "), frange=[0x%8.8x - 0x%8.8x)\n",
//                    i, 
//                    range_entry.GetRangeBase(),
//                    range_entry.GetRangeEnd(),
//                    range_entry.data.GetRangeBase(),
//                    range_entry.data.GetRangeEnd());

            if (last_entry &&
                last_entry->GetRangeEnd() == range_entry.GetRangeBase() &&
                last_entry->data.GetRangeEnd() == range_entry.data.GetRangeBase())
            {
                last_entry->SetRangeEnd (range_entry.GetRangeEnd());
                last_entry->data.SetRangeEnd (range_entry.data.GetRangeEnd());
                //puts("combine");
            }
            else
            {
                m_core_aranges.Append(range_entry);
            }
        }
    }
    if (!ranges_are_sorted)
    {
        m_core_aranges.Sort();
    }

    if (m_dyld_addr == LLDB_INVALID_ADDRESS || m_mach_kernel_addr == LLDB_INVALID_ADDRESS)
    {
        // We need to locate the main executable in the memory ranges
        // we have in the core file.  We need to search for both a user-process dyld binary
        // and a kernel binary in memory; we must look at all the pages in the binary so
        // we don't miss one or the other.  If we find a user-process dyld binary, stop
        // searching -- that's the one we'll prefer over the mach kernel.
        const size_t num_core_aranges = m_core_aranges.GetSize();
        for (size_t i=0; i<num_core_aranges && m_dyld_addr == LLDB_INVALID_ADDRESS; ++i)
        {
            const VMRangeToFileOffset::Entry *entry = m_core_aranges.GetEntryAtIndex(i);
            lldb::addr_t section_vm_addr_start = entry->GetRangeBase();
            lldb::addr_t section_vm_addr_end = entry->GetRangeEnd();
            for (lldb::addr_t section_vm_addr = section_vm_addr_start;
                 section_vm_addr < section_vm_addr_end;
                 section_vm_addr += 0x1000)
            {
                GetDynamicLoaderAddress (section_vm_addr);
            }
        }
    }

    // If we found both a user-process dyld and a kernel binary, we need to decide
    // which to prefer.
    if (GetCorefilePreference() == eKernelCorefile)
    {
        if (m_mach_kernel_addr != LLDB_INVALID_ADDRESS)
        {
            m_dyld_plugin_name = DynamicLoaderDarwinKernel::GetPluginNameStatic();
        }
        else if (m_dyld_addr != LLDB_INVALID_ADDRESS)
        {
            m_dyld_plugin_name = DynamicLoaderMacOSXDYLD::GetPluginNameStatic();
        }
    }
    else
    {
        if (m_dyld_addr != LLDB_INVALID_ADDRESS)
        {
            m_dyld_plugin_name = DynamicLoaderMacOSXDYLD::GetPluginNameStatic();
        }
        else if (m_mach_kernel_addr != LLDB_INVALID_ADDRESS)
        {
            m_dyld_plugin_name = DynamicLoaderDarwinKernel::GetPluginNameStatic();
        }
    }

    // Even if the architecture is set in the target, we need to override
    // it to match the core file which is always single arch.
    ArchSpec arch (m_core_module_sp->GetArchitecture());
    if (arch.GetCore() == ArchSpec::eCore_x86_32_i486)
    {
        arch.SetTriple ("i386", m_target.GetPlatform().get());
    }
    if (arch.IsValid())
        m_target.SetArchitecture(arch);            

    return error;
}

Error
ModuleList::GetSharedModule
(
    const FileSpec& in_file_spec,
    const ArchSpec& arch,
    const lldb_private::UUID *uuid_ptr,
    const ConstString *object_name_ptr,
    off_t object_offset,
    ModuleSP &module_sp,
    ModuleSP *old_module_sp_ptr,
    bool *did_create_ptr,
    bool always_create
)
{
    ModuleList &shared_module_list = GetSharedModuleList ();
    Mutex::Locker locker(shared_module_list.m_modules_mutex);
    char path[PATH_MAX];
    char uuid_cstr[64];

    Error error;

    module_sp.reset();

    if (did_create_ptr)
        *did_create_ptr = false;
    if (old_module_sp_ptr)
        old_module_sp_ptr->reset();


    // First just try and get the file where it purports to be (path in
    // in_file_spec), then check and uuid.

    if (in_file_spec)
    {
        // Make sure no one else can try and get or create a module while this
        // function is actively working on it by doing an extra lock on the
        // global mutex list.
        if (always_create == false)
        {
            ModuleList matching_module_list;
            const size_t num_matching_modules = shared_module_list.FindModules (&in_file_spec, &arch, NULL, object_name_ptr, matching_module_list);
            if (num_matching_modules > 0)
            {
                for (uint32_t module_idx = 0; module_idx < num_matching_modules; ++module_idx)
                {
                    module_sp = matching_module_list.GetModuleAtIndex(module_idx);
                    if (uuid_ptr && uuid_ptr->IsValid())
                    {
                        // We found the module we were looking for.
                        if (module_sp->GetUUID() == *uuid_ptr)
                            return error;
                    }
                    else
                    {
                        // If we didn't have a UUID in mind when looking for the object file,
                        // then we should make sure the modification time hasn't changed!
                        TimeValue file_spec_mod_time(in_file_spec.GetModificationTime());
                        if (file_spec_mod_time.IsValid())
                        {
                            if (file_spec_mod_time == module_sp->GetModificationTime())
                                return error;
                        }
                    }
                    if (old_module_sp_ptr && !old_module_sp_ptr->get())
                        *old_module_sp_ptr = module_sp;
                    shared_module_list.Remove (module_sp);
                    module_sp.reset();
                }
            }
        }

        if (module_sp)
            return error;
        else
        {
#if defined ENABLE_MODULE_SP_LOGGING
            ModuleSP logging_module_sp (new Module (in_file_spec, arch, object_name_ptr, object_offset), ModuleSharedPtrLogger, (void *)ConstString("a.out").GetCString());
            module_sp = logging_module_sp;
#else
            module_sp.reset (new Module (in_file_spec, arch, object_name_ptr, object_offset));
#endif
            // Make sure there are a module and an object file since we can specify
            // a valid file path with an architecture that might not be in that file.
            // By getting the object file we can guarantee that the architecture matches
            if (module_sp && module_sp->GetObjectFile())
            {
                // If we get in here we got the correct arch, now we just need
                // to verify the UUID if one was given
                if (uuid_ptr && *uuid_ptr != module_sp->GetUUID())
                    module_sp.reset();
                else
                {
                    if (did_create_ptr)
                        *did_create_ptr = true;
                    
                    shared_module_list.Append(module_sp);
                    return error;
                }
            }
        }
//.........这里部分代码省略.........

bool
CommandObjectFile::Execute
(
    CommandInterpreter &interpreter,
    Args& command,
    CommandReturnObject &result
)
{
    const char *file_path = command.GetArgumentAtIndex(0);
    Timer scoped_timer(__PRETTY_FUNCTION__, "(dbg) file '%s'", file_path);
    const int argc = command.GetArgumentCount();
    if (argc == 1)
    {
        FileSpec file_spec (file_path);

        if (! file_spec.Exists())
        {
            result.AppendErrorWithFormat ("File '%s' does not exist.\n", file_path);
            result.SetStatus (eReturnStatusFailed);
            return result.Succeeded();
        }

        TargetSP target_sp;

        ArchSpec arch;
        if (m_options.m_arch.IsValid())
            arch = m_options.m_arch;
        else
        {
            arch = lldb_private::GetDefaultArchitecture ();
            if (!arch.IsValid())
                arch = LLDB_ARCH_DEFAULT;
        }
        Debugger &debugger = interpreter.GetDebugger();
        Error error = debugger.GetTargetList().CreateTarget (debugger, file_spec, arch, NULL, true, target_sp);

        if (error.Fail() && !m_options.m_arch.IsValid())
        {
            if (arch == LLDB_ARCH_DEFAULT_32BIT)
                arch = LLDB_ARCH_DEFAULT_64BIT;
            else
                arch = LLDB_ARCH_DEFAULT_32BIT;
            error = debugger.GetTargetList().CreateTarget (debugger, file_spec, arch, NULL, true, target_sp);
        }

        if (target_sp)
        {
            debugger.GetTargetList().SetCurrentTarget(target_sp.get());
            result.AppendMessageWithFormat ("Current executable set to '%s' (%s).\n", file_path, arch.AsCString());
            result.SetStatus (eReturnStatusSuccessFinishNoResult);
        }
        else
        {
            result.AppendError(error.AsCString());
            result.SetStatus (eReturnStatusFailed);
        }
    }
    else
    {
        result.AppendErrorWithFormat("'%s' takes exactly one executable path argument.\n", m_cmd_name.c_str());
        result.SetStatus (eReturnStatusFailed);
    }
    return result.Succeeded();

}

//----------------------------------------------------------------------
// Process Control
//----------------------------------------------------------------------
Error
ProcessElfCore::DoLoadCore ()
{
    Error error;
    if (!m_core_module_sp)
    {
        error.SetErrorString ("invalid core module");   
        return error;
    }

    ObjectFileELF *core = (ObjectFileELF *)(m_core_module_sp->GetObjectFile());
    if (core == NULL)
    {
        error.SetErrorString ("invalid core object file");   
        return error;
    }

    const uint32_t num_segments = core->GetProgramHeaderCount();
    if (num_segments == 0)
    {
        error.SetErrorString ("core file has no sections");   
        return error;
    }

    SetCanJIT(false);

    m_thread_data_valid = true;

    bool ranges_are_sorted = true;
    lldb::addr_t vm_addr = 0;
    /// Walk through segments and Thread and Address Map information.
    /// PT_NOTE - Contains Thread and Register information
    /// PT_LOAD - Contains a contiguous range of Process Address Space
    for(uint32_t i = 1; i <= num_segments; i++)
    {
        const elf::ELFProgramHeader *header = core->GetProgramHeaderByIndex(i);
        assert(header != NULL);

        DataExtractor data = core->GetSegmentDataByIndex(i);

        // Parse thread contexts and auxv structure
        if (header->p_type == llvm::ELF::PT_NOTE)
            ParseThreadContextsFromNoteSegment(header, data);

        // PT_LOAD segments contains address map
        if (header->p_type == llvm::ELF::PT_LOAD)
        {
            lldb::addr_t last_addr = AddAddressRangeFromLoadSegment(header);
            if (vm_addr > last_addr)
                ranges_are_sorted = false;
            vm_addr = last_addr;
        }
    }

    if (!ranges_are_sorted)
        m_core_aranges.Sort();

    // Even if the architecture is set in the target, we need to override
    // it to match the core file which is always single arch.
    ArchSpec arch (m_core_module_sp->GetArchitecture());
    if (arch.IsValid())
        m_target.SetArchitecture(arch);            

    return error;
}

Error
PlatformLinux::ResolveExecutable (const FileSpec &exe_file,
                                  const ArchSpec &exe_arch,
                                  lldb::ModuleSP &exe_module_sp,
                                  const FileSpecList *module_search_paths_ptr)
{
    Error error;
    // Nothing special to do here, just use the actual file and architecture

    char exe_path[PATH_MAX];
    FileSpec resolved_exe_file (exe_file);
    
    if (IsHost())
    {
        // If we have "ls" as the exe_file, resolve the executable location based on
        // the current path variables
        if (!resolved_exe_file.Exists())
        {
            exe_file.GetPath(exe_path, sizeof(exe_path));
            resolved_exe_file.SetFile(exe_path, true);
        }

        if (!resolved_exe_file.Exists())
            resolved_exe_file.ResolveExecutableLocation ();

        if (resolved_exe_file.Exists())
            error.Clear();
        else
        {
            exe_file.GetPath(exe_path, sizeof(exe_path));
            error.SetErrorStringWithFormat("unable to find executable for '%s'", exe_path);
        }
    }
    else
    {
        if (m_remote_platform_sp)
        {
            error = m_remote_platform_sp->ResolveExecutable (exe_file,
                                                             exe_arch,
                                                             exe_module_sp,
                                                             NULL);
        }
        else
        {
            // We may connect to a process and use the provided executable (Don't use local $PATH).
            
            if (resolved_exe_file.Exists())
                error.Clear();
            else
                error.SetErrorStringWithFormat("the platform is not currently connected, and '%s' doesn't exist in the system root.", exe_path);
        }
    }

    if (error.Success())
    {
        ModuleSpec module_spec (resolved_exe_file, exe_arch);
        if (exe_arch.IsValid())
        {
            error = ModuleList::GetSharedModule (module_spec, 
                                                 exe_module_sp, 
                                                 NULL, 
                                                 NULL,
                                                 NULL);
        
            // TODO find out why exe_module_sp might be NULL            
            if (!exe_module_sp || exe_module_sp->GetObjectFile() == NULL)
            {
                exe_module_sp.reset();
                error.SetErrorStringWithFormat ("'%s%s%s' doesn't contain the architecture %s",
                                                exe_file.GetDirectory().AsCString(""),
                                                exe_file.GetDirectory() ? "/" : "",
                                                exe_file.GetFilename().AsCString(""),
                                                exe_arch.GetArchitectureName());
            }
        }
        else
        {
            // No valid architecture was specified, ask the platform for
            // the architectures that we should be using (in the correct order)
            // and see if we can find a match that way
            StreamString arch_names;
            for (uint32_t idx = 0; GetSupportedArchitectureAtIndex (idx, module_spec.GetArchitecture()); ++idx)
            {
                error = ModuleList::GetSharedModule (module_spec, 
                                                     exe_module_sp, 
                                                     NULL, 
                                                     NULL,
                                                     NULL);
                // Did we find an executable using one of the 
                if (error.Success())
                {
                    if (exe_module_sp && exe_module_sp->GetObjectFile())
                        break;
                    else
                        error.SetErrorToGenericError();
                }
                
                if (idx > 0)
                    arch_names.PutCString (", ");
                arch_names.PutCString (module_spec.GetArchitecture().GetArchitectureName());
//.........这里部分代码省略.........

//----------------------------------------------------------------------
// Process Control
//----------------------------------------------------------------------
Error
ProcessElfCore::DoLoadCore ()
{
    Error error;
    if (!m_core_module_sp)
    {
        error.SetErrorString ("invalid core module");
        return error;
    }

    ObjectFileELF *core = (ObjectFileELF *)(m_core_module_sp->GetObjectFile());
    if (core == NULL)
    {
        error.SetErrorString ("invalid core object file");
        return error;
    }

    const uint32_t num_segments = core->GetProgramHeaderCount();
    if (num_segments == 0)
    {
        error.SetErrorString ("core file has no segments");
        return error;
    }

    SetCanJIT(false);

    m_thread_data_valid = true;

    bool ranges_are_sorted = true;
    lldb::addr_t vm_addr = 0;
    /// Walk through segments and Thread and Address Map information.
    /// PT_NOTE - Contains Thread and Register information
    /// PT_LOAD - Contains a contiguous range of Process Address Space
    for(uint32_t i = 1; i <= num_segments; i++)
    {
        const elf::ELFProgramHeader *header = core->GetProgramHeaderByIndex(i);
        assert(header != NULL);

        DataExtractor data = core->GetSegmentDataByIndex(i);

        // Parse thread contexts and auxv structure
        if (header->p_type == llvm::ELF::PT_NOTE)
            ParseThreadContextsFromNoteSegment(header, data);

        // PT_LOAD segments contains address map
        if (header->p_type == llvm::ELF::PT_LOAD)
        {
            lldb::addr_t last_addr = AddAddressRangeFromLoadSegment(header);
            if (vm_addr > last_addr)
                ranges_are_sorted = false;
            vm_addr = last_addr;
        }
    }

    if (!ranges_are_sorted)
    {
        m_core_aranges.Sort();
        m_core_range_infos.Sort();
    }

    // Even if the architecture is set in the target, we need to override
    // it to match the core file which is always single arch.
    ArchSpec arch (m_core_module_sp->GetArchitecture());
    if (arch.IsValid())
        GetTarget().SetArchitecture(arch);

    SetUnixSignals(UnixSignals::Create(GetArchitecture()));

    // Core files are useless without the main executable. See if we can locate the main
    // executable using data we found in the core file notes.
    lldb::ModuleSP exe_module_sp = GetTarget().GetExecutableModule();
    if (!exe_module_sp)
    {
        // The first entry in the NT_FILE might be our executable
        if (!m_nt_file_entries.empty())
        {
            ModuleSpec exe_module_spec;
            exe_module_spec.GetArchitecture() = arch;
            exe_module_spec.GetFileSpec().SetFile(m_nt_file_entries[0].path.GetCString(), false);
            if (exe_module_spec.GetFileSpec())
            {
                exe_module_sp = GetTarget().GetSharedModule(exe_module_spec);
                if (exe_module_sp)
                    GetTarget().SetExecutableModule(exe_module_sp, false);
            }
        }
    }
    return error;
}