1 //===-- ObjectFile.cpp ------------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/lldb-private.h"
11 #include "lldb/Core/DataBuffer.h"
12 #include "lldb/Core/DataBufferHeap.h"
13 #include "lldb/Core/Log.h"
14 #include "lldb/Core/Module.h"
15 #include "lldb/Core/ModuleSpec.h"
16 #include "lldb/Core/PluginManager.h"
17 #include "lldb/Core/RegularExpression.h"
18 #include "lldb/Core/Section.h"
19 #include "lldb/Core/Timer.h"
20 #include "lldb/Symbol/ObjectFile.h"
21 #include "lldb/Symbol/ObjectContainer.h"
22 #include "lldb/Symbol/SymbolFile.h"
23 #include "lldb/Target/Process.h"
24 #include "Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.h"
25 
26 using namespace lldb;
27 using namespace lldb_private;
28 
29 ObjectFileSP
30 ObjectFile::FindPlugin (const lldb::ModuleSP &module_sp,
31                         const FileSpec* file,
32                         lldb::offset_t file_offset,
33                         lldb::offset_t file_size,
34                         DataBufferSP &data_sp,
35                         lldb::offset_t &data_offset)
36 {
37     ObjectFileSP object_file_sp;
38 
39     if (module_sp)
40     {
41         Timer scoped_timer (__PRETTY_FUNCTION__,
42                             "ObjectFile::FindPlugin (module = %s, file = %p, file_offset = 0x%8.8" PRIx64 ", file_size = 0x%8.8" PRIx64 ")",
43                             module_sp->GetFileSpec().GetPath().c_str(),
44                             static_cast<const void*>(file),
45                             static_cast<uint64_t>(file_offset),
46                             static_cast<uint64_t>(file_size));
47         if (file)
48         {
49             FileSpec archive_file;
50             ObjectContainerCreateInstance create_object_container_callback;
51 
52             const bool file_exists = file->Exists();
53             if (!data_sp)
54             {
55                 // We have an object name which most likely means we have
56                 // a .o file in a static archive (.a file). Try and see if
57                 // we have a cached archive first without reading any data
58                 // first
59                 if (file_exists && module_sp->GetObjectName())
60                 {
61                     for (uint32_t idx = 0; (create_object_container_callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(idx)) != nullptr; ++idx)
62                     {
63                         std::unique_ptr<ObjectContainer> object_container_ap(create_object_container_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
64 
65                         if (object_container_ap.get())
66                             object_file_sp = object_container_ap->GetObjectFile(file);
67 
68                         if (object_file_sp.get())
69                             return object_file_sp;
70                     }
71                 }
72                 // Ok, we didn't find any containers that have a named object, now
73                 // lets read the first 512 bytes from the file so the object file
74                 // and object container plug-ins can use these bytes to see if they
75                 // can parse this file.
76                 if (file_size > 0)
77                 {
78                     data_sp = file->ReadFileContents(file_offset, std::min<size_t>(512, file_size));
79                     data_offset = 0;
80                 }
81             }
82 
83             if (!data_sp || data_sp->GetByteSize() == 0)
84             {
85                 // Check for archive file with format "/path/to/archive.a(object.o)"
86                 char path_with_object[PATH_MAX*2];
87                 module_sp->GetFileSpec().GetPath(path_with_object, sizeof(path_with_object));
88 
89                 ConstString archive_object;
90                 const bool must_exist = true;
91                 if (ObjectFile::SplitArchivePathWithObject (path_with_object, archive_file, archive_object, must_exist))
92                 {
93                     file_size = archive_file.GetByteSize();
94                     if (file_size > 0)
95                     {
96                         file = &archive_file;
97                         module_sp->SetFileSpecAndObjectName (archive_file, archive_object);
98                         // Check if this is a object container by iterating through all object
99                         // container plugin instances and then trying to get an object file
100                         // from the container plugins since we had a name. Also, don't read
101                         // ANY data in case there is data cached in the container plug-ins
102                         // (like BSD archives caching the contained objects within an file).
103                         for (uint32_t idx = 0; (create_object_container_callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(idx)) != nullptr; ++idx)
104                         {
105                             std::unique_ptr<ObjectContainer> object_container_ap(create_object_container_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
106 
107                             if (object_container_ap.get())
108                                 object_file_sp = object_container_ap->GetObjectFile(file);
109 
110                             if (object_file_sp.get())
111                                 return object_file_sp;
112                         }
113                         // We failed to find any cached object files in the container
114                         // plug-ins, so lets read the first 512 bytes and try again below...
115                         data_sp = archive_file.ReadFileContents(file_offset, 512);
116                     }
117                 }
118             }
119 
120             if (data_sp && data_sp->GetByteSize() > 0)
121             {
122                 // Check if this is a normal object file by iterating through
123                 // all object file plugin instances.
124                 ObjectFileCreateInstance create_object_file_callback;
125                 for (uint32_t idx = 0; (create_object_file_callback = PluginManager::GetObjectFileCreateCallbackAtIndex(idx)) != nullptr; ++idx)
126                 {
127                     object_file_sp.reset (create_object_file_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
128                     if (object_file_sp.get())
129                         return object_file_sp;
130                 }
131 
132                 // Check if this is a object container by iterating through
133                 // all object container plugin instances and then trying to get
134                 // an object file from the container.
135                 for (uint32_t idx = 0; (create_object_container_callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(idx)) != nullptr; ++idx)
136                 {
137                     std::unique_ptr<ObjectContainer> object_container_ap(create_object_container_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
138 
139                     if (object_container_ap.get())
140                         object_file_sp = object_container_ap->GetObjectFile(file);
141 
142                     if (object_file_sp.get())
143                         return object_file_sp;
144                 }
145             }
146         }
147     }
148     // We didn't find it, so clear our shared pointer in case it
149     // contains anything and return an empty shared pointer
150     object_file_sp.reset();
151     return object_file_sp;
152 }
153 
154 ObjectFileSP
155 ObjectFile::FindPlugin (const lldb::ModuleSP &module_sp,
156                         const ProcessSP &process_sp,
157                         lldb::addr_t header_addr,
158                         DataBufferSP &data_sp)
159 {
160     ObjectFileSP object_file_sp;
161 
162     if (module_sp)
163     {
164         Timer scoped_timer (__PRETTY_FUNCTION__,
165                             "ObjectFile::FindPlugin (module = %s, process = %p, header_addr = 0x%" PRIx64 ")",
166                             module_sp->GetFileSpec().GetPath().c_str(),
167                             static_cast<void*>(process_sp.get()), header_addr);
168         uint32_t idx;
169 
170         // Check if this is a normal object file by iterating through
171         // all object file plugin instances.
172         ObjectFileCreateMemoryInstance create_callback;
173         for (idx = 0; (create_callback = PluginManager::GetObjectFileCreateMemoryCallbackAtIndex(idx)) != nullptr; ++idx)
174         {
175             object_file_sp.reset (create_callback(module_sp, data_sp, process_sp, header_addr));
176             if (object_file_sp.get())
177                 return object_file_sp;
178         }
179     }
180 
181     // We didn't find it, so clear our shared pointer in case it
182     // contains anything and return an empty shared pointer
183     object_file_sp.reset();
184     return object_file_sp;
185 }
186 
187 size_t
188 ObjectFile::GetModuleSpecifications (const FileSpec &file,
189                                      lldb::offset_t file_offset,
190                                      lldb::offset_t file_size,
191                                      ModuleSpecList &specs)
192 {
193     DataBufferSP data_sp (file.ReadFileContents(file_offset, 512));
194     if (data_sp)
195     {
196         if (file_size == 0)
197         {
198             const lldb::offset_t actual_file_size = file.GetByteSize();
199             if (actual_file_size > file_offset)
200                 file_size = actual_file_size - file_offset;
201         }
202         return ObjectFile::GetModuleSpecifications (file,       // file spec
203                                                     data_sp,    // data bytes
204                                                     0,          // data offset
205                                                     file_offset,// file offset
206                                                     file_size,  // file length
207                                                     specs);
208     }
209     return 0;
210 }
211 
212 size_t
213 ObjectFile::GetModuleSpecifications (const lldb_private::FileSpec& file,
214                                      lldb::DataBufferSP& data_sp,
215                                      lldb::offset_t data_offset,
216                                      lldb::offset_t file_offset,
217                                      lldb::offset_t file_size,
218                                      lldb_private::ModuleSpecList &specs)
219 {
220     const size_t initial_count = specs.GetSize();
221     ObjectFileGetModuleSpecifications callback;
222     uint32_t i;
223     // Try the ObjectFile plug-ins
224     for (i = 0; (callback = PluginManager::GetObjectFileGetModuleSpecificationsCallbackAtIndex(i)) != nullptr; ++i)
225     {
226         if (callback (file, data_sp, data_offset, file_offset, file_size, specs) > 0)
227             return specs.GetSize() - initial_count;
228     }
229 
230     // Try the ObjectContainer plug-ins
231     for (i = 0; (callback = PluginManager::GetObjectContainerGetModuleSpecificationsCallbackAtIndex(i)) != nullptr; ++i)
232     {
233         if (callback (file, data_sp, data_offset, file_offset, file_size, specs) > 0)
234             return specs.GetSize() - initial_count;
235     }
236     return 0;
237 }
238 
239 ObjectFile::ObjectFile (const lldb::ModuleSP &module_sp,
240                         const FileSpec *file_spec_ptr,
241                         lldb::offset_t file_offset,
242                         lldb::offset_t length,
243                         const lldb::DataBufferSP& data_sp,
244                         lldb::offset_t data_offset) :
245     ModuleChild (module_sp),
246     m_file (),  // This file could be different from the original module's file
247     m_type (eTypeInvalid),
248     m_strata (eStrataInvalid),
249     m_file_offset (file_offset),
250     m_length (length),
251     m_data (),
252     m_unwind_table (*this),
253     m_process_wp(),
254     m_memory_addr (LLDB_INVALID_ADDRESS),
255     m_sections_ap(),
256     m_symtab_ap (),
257     m_synthetic_symbol_idx (0)
258 {
259     if (file_spec_ptr)
260         m_file = *file_spec_ptr;
261     if (data_sp)
262         m_data.SetData (data_sp, data_offset, length);
263     Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
264     if (log)
265         log->Printf ("%p ObjectFile::ObjectFile() module = %p (%s), file = %s, file_offset = 0x%8.8" PRIx64 ", size = %" PRIu64,
266                      static_cast<void*>(this),
267                      static_cast<void*>(module_sp.get()),
268                      module_sp->GetSpecificationDescription().c_str(),
269                      m_file ? m_file.GetPath().c_str() : "<NULL>",
270                      m_file_offset, m_length);
271 }
272 
273 
274 ObjectFile::ObjectFile (const lldb::ModuleSP &module_sp,
275                         const ProcessSP &process_sp,
276                         lldb::addr_t header_addr,
277                         DataBufferSP& header_data_sp) :
278     ModuleChild (module_sp),
279     m_file (),
280     m_type (eTypeInvalid),
281     m_strata (eStrataInvalid),
282     m_file_offset (0),
283     m_length (0),
284     m_data (),
285     m_unwind_table (*this),
286     m_process_wp (process_sp),
287     m_memory_addr (header_addr),
288     m_sections_ap(),
289     m_symtab_ap (),
290     m_synthetic_symbol_idx (0)
291 {
292     if (header_data_sp)
293         m_data.SetData (header_data_sp, 0, header_data_sp->GetByteSize());
294     Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
295     if (log)
296         log->Printf ("%p ObjectFile::ObjectFile() module = %p (%s), process = %p, header_addr = 0x%" PRIx64,
297                      static_cast<void*>(this),
298                      static_cast<void*>(module_sp.get()),
299                      module_sp->GetSpecificationDescription().c_str(),
300                      static_cast<void*>(process_sp.get()), m_memory_addr);
301 }
302 
303 
304 ObjectFile::~ObjectFile()
305 {
306     Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
307     if (log)
308         log->Printf ("%p ObjectFile::~ObjectFile ()\n",
309                      static_cast<void*>(this));
310 }
311 
312 bool
313 ObjectFile::SetModulesArchitecture (const ArchSpec &new_arch)
314 {
315     ModuleSP module_sp (GetModule());
316     if (module_sp)
317         return module_sp->SetArchitecture (new_arch);
318     return false;
319 }
320 
321 AddressClass
322 ObjectFile::GetAddressClass (addr_t file_addr)
323 {
324     Symtab *symtab = GetSymtab();
325     if (symtab)
326     {
327         Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr);
328         if (symbol)
329         {
330             if (symbol->ValueIsAddress())
331             {
332                 const SectionSP section_sp (symbol->GetAddressRef().GetSection());
333                 if (section_sp)
334                 {
335                     const SectionType section_type = section_sp->GetType();
336                     switch (section_type)
337                     {
338                     case eSectionTypeInvalid:
339                         return eAddressClassUnknown;
340                     case eSectionTypeCode:
341                         return eAddressClassCode;
342                     case eSectionTypeContainer:
343                         return eAddressClassUnknown;
344                     case eSectionTypeData:
345                     case eSectionTypeDataCString:
346                     case eSectionTypeDataCStringPointers:
347                     case eSectionTypeDataSymbolAddress:
348                     case eSectionTypeData4:
349                     case eSectionTypeData8:
350                     case eSectionTypeData16:
351                     case eSectionTypeDataPointers:
352                     case eSectionTypeZeroFill:
353                     case eSectionTypeDataObjCMessageRefs:
354                     case eSectionTypeDataObjCCFStrings:
355                     case eSectionTypeGoSymtab:
356                         return eAddressClassData;
357                     case eSectionTypeDebug:
358                     case eSectionTypeDWARFDebugAbbrev:
359                     case eSectionTypeDWARFDebugAddr:
360                     case eSectionTypeDWARFDebugAranges:
361                     case eSectionTypeDWARFDebugFrame:
362                     case eSectionTypeDWARFDebugInfo:
363                     case eSectionTypeDWARFDebugLine:
364                     case eSectionTypeDWARFDebugLoc:
365                     case eSectionTypeDWARFDebugMacInfo:
366                     case eSectionTypeDWARFDebugMacro:
367                     case eSectionTypeDWARFDebugPubNames:
368                     case eSectionTypeDWARFDebugPubTypes:
369                     case eSectionTypeDWARFDebugRanges:
370                     case eSectionTypeDWARFDebugStr:
371                     case eSectionTypeDWARFDebugStrOffsets:
372                     case eSectionTypeDWARFAppleNames:
373                     case eSectionTypeDWARFAppleTypes:
374                     case eSectionTypeDWARFAppleNamespaces:
375                     case eSectionTypeDWARFAppleObjC:
376                         return eAddressClassDebug;
377                     case eSectionTypeEHFrame:
378                     case eSectionTypeARMexidx:
379                     case eSectionTypeARMextab:
380                     case eSectionTypeCompactUnwind:
381                         return eAddressClassRuntime;
382                     case eSectionTypeELFSymbolTable:
383                     case eSectionTypeELFDynamicSymbols:
384                     case eSectionTypeELFRelocationEntries:
385                     case eSectionTypeELFDynamicLinkInfo:
386                     case eSectionTypeOther:
387                         return eAddressClassUnknown;
388                     case eSectionTypeAbsoluteAddress:
389                         // In case of absolute sections decide the address class based on the symbol
390                         // type because the section type isn't specify if it is a code or a data
391                         // section.
392                         break;
393                     }
394                 }
395             }
396 
397             const SymbolType symbol_type = symbol->GetType();
398             switch (symbol_type)
399             {
400             case eSymbolTypeAny:            return eAddressClassUnknown;
401             case eSymbolTypeAbsolute:       return eAddressClassUnknown;
402             case eSymbolTypeCode:           return eAddressClassCode;
403             case eSymbolTypeTrampoline:     return eAddressClassCode;
404             case eSymbolTypeResolver:       return eAddressClassCode;
405             case eSymbolTypeData:           return eAddressClassData;
406             case eSymbolTypeRuntime:        return eAddressClassRuntime;
407             case eSymbolTypeException:      return eAddressClassRuntime;
408             case eSymbolTypeSourceFile:     return eAddressClassDebug;
409             case eSymbolTypeHeaderFile:     return eAddressClassDebug;
410             case eSymbolTypeObjectFile:     return eAddressClassDebug;
411             case eSymbolTypeCommonBlock:    return eAddressClassDebug;
412             case eSymbolTypeBlock:          return eAddressClassDebug;
413             case eSymbolTypeLocal:          return eAddressClassData;
414             case eSymbolTypeParam:          return eAddressClassData;
415             case eSymbolTypeVariable:       return eAddressClassData;
416             case eSymbolTypeVariableType:   return eAddressClassDebug;
417             case eSymbolTypeLineEntry:      return eAddressClassDebug;
418             case eSymbolTypeLineHeader:     return eAddressClassDebug;
419             case eSymbolTypeScopeBegin:     return eAddressClassDebug;
420             case eSymbolTypeScopeEnd:       return eAddressClassDebug;
421             case eSymbolTypeAdditional:     return eAddressClassUnknown;
422             case eSymbolTypeCompiler:       return eAddressClassDebug;
423             case eSymbolTypeInstrumentation:return eAddressClassDebug;
424             case eSymbolTypeUndefined:      return eAddressClassUnknown;
425             case eSymbolTypeObjCClass:      return eAddressClassRuntime;
426             case eSymbolTypeObjCMetaClass:  return eAddressClassRuntime;
427             case eSymbolTypeObjCIVar:       return eAddressClassRuntime;
428             case eSymbolTypeReExported:     return eAddressClassRuntime;
429             }
430         }
431     }
432     return eAddressClassUnknown;
433 }
434 
435 DataBufferSP
436 ObjectFile::ReadMemory (const ProcessSP &process_sp, lldb::addr_t addr, size_t byte_size)
437 {
438     DataBufferSP data_sp;
439     if (process_sp)
440     {
441         std::unique_ptr<DataBufferHeap> data_ap (new DataBufferHeap (byte_size, 0));
442         Error error;
443         const size_t bytes_read = process_sp->ReadMemory (addr,
444                                                           data_ap->GetBytes(),
445                                                           data_ap->GetByteSize(),
446                                                           error);
447         if (bytes_read == byte_size)
448             data_sp.reset (data_ap.release());
449     }
450     return data_sp;
451 }
452 
453 size_t
454 ObjectFile::GetData (lldb::offset_t offset, size_t length, DataExtractor &data) const
455 {
456     // The entire file has already been mmap'ed into m_data, so just copy from there
457     // as the back mmap buffer will be shared with shared pointers.
458     return data.SetData (m_data, offset, length);
459 }
460 
461 size_t
462 ObjectFile::CopyData (lldb::offset_t offset, size_t length, void *dst) const
463 {
464     // The entire file has already been mmap'ed into m_data, so just copy from there
465     // Note that the data remains in target byte order.
466     return m_data.CopyData (offset, length, dst);
467 }
468 
469 
470 size_t
471 ObjectFile::ReadSectionData (const Section *section, lldb::offset_t section_offset, void *dst, size_t dst_len) const
472 {
473     assert(section);
474     section_offset *= section->GetTargetByteSize();
475 
476     // If some other objectfile owns this data, pass this to them.
477     if (section->GetObjectFile() != this)
478         return section->GetObjectFile()->ReadSectionData (section, section_offset, dst, dst_len);
479 
480     if (IsInMemory())
481     {
482         ProcessSP process_sp (m_process_wp.lock());
483         if (process_sp)
484         {
485             Error error;
486             const addr_t base_load_addr = section->GetLoadBaseAddress (&process_sp->GetTarget());
487             if (base_load_addr != LLDB_INVALID_ADDRESS)
488                 return process_sp->ReadMemory (base_load_addr + section_offset, dst, dst_len, error);
489         }
490     }
491     else
492     {
493         const lldb::offset_t section_file_size = section->GetFileSize();
494         if (section_offset < section_file_size)
495         {
496             const size_t section_bytes_left = section_file_size - section_offset;
497             size_t section_dst_len = dst_len;
498             if (section_dst_len > section_bytes_left)
499                 section_dst_len = section_bytes_left;
500             return CopyData (section->GetFileOffset() + section_offset, section_dst_len, dst);
501         }
502         else
503         {
504             if (section->GetType() == eSectionTypeZeroFill)
505             {
506                 const uint64_t section_size = section->GetByteSize();
507                 const uint64_t section_bytes_left = section_size - section_offset;
508                 uint64_t section_dst_len = dst_len;
509                 if (section_dst_len > section_bytes_left)
510                     section_dst_len = section_bytes_left;
511                 memset(dst, 0, section_dst_len);
512                 return section_dst_len;
513             }
514         }
515     }
516     return 0;
517 }
518 
519 //----------------------------------------------------------------------
520 // Get the section data the file on disk
521 //----------------------------------------------------------------------
522 size_t
523 ObjectFile::ReadSectionData (const Section *section, DataExtractor& section_data) const
524 {
525     // If some other objectfile owns this data, pass this to them.
526     if (section->GetObjectFile() != this)
527         return section->GetObjectFile()->ReadSectionData (section, section_data);
528 
529     if (IsInMemory())
530     {
531         ProcessSP process_sp (m_process_wp.lock());
532         if (process_sp)
533         {
534             const addr_t base_load_addr = section->GetLoadBaseAddress (&process_sp->GetTarget());
535             if (base_load_addr != LLDB_INVALID_ADDRESS)
536             {
537                 DataBufferSP data_sp (ReadMemory (process_sp, base_load_addr, section->GetByteSize()));
538                 if (data_sp)
539                 {
540                     section_data.SetData (data_sp, 0, data_sp->GetByteSize());
541                     section_data.SetByteOrder (process_sp->GetByteOrder());
542                     section_data.SetAddressByteSize (process_sp->GetAddressByteSize());
543                     return section_data.GetByteSize();
544                 }
545             }
546         }
547         return GetData(section->GetFileOffset(), section->GetFileSize(), section_data);
548     }
549     else
550     {
551         // The object file now contains a full mmap'ed copy of the object file data, so just use this
552         return MemoryMapSectionData (section, section_data);
553     }
554 }
555 
556 size_t
557 ObjectFile::MemoryMapSectionData (const Section *section, DataExtractor& section_data) const
558 {
559     // If some other objectfile owns this data, pass this to them.
560     if (section->GetObjectFile() != this)
561         return section->GetObjectFile()->MemoryMapSectionData (section, section_data);
562 
563     if (IsInMemory())
564     {
565         return ReadSectionData (section, section_data);
566     }
567     else
568     {
569         // The object file now contains a full mmap'ed copy of the object file data, so just use this
570         return GetData(section->GetFileOffset(), section->GetFileSize(), section_data);
571     }
572 }
573 
574 
575 bool
576 ObjectFile::SplitArchivePathWithObject (const char *path_with_object, FileSpec &archive_file, ConstString &archive_object, bool must_exist)
577 {
578     RegularExpression g_object_regex("(.*)\\(([^\\)]+)\\)$");
579     RegularExpression::Match regex_match(2);
580     if (g_object_regex.Execute (path_with_object, &regex_match))
581     {
582         std::string path;
583         std::string obj;
584         if (regex_match.GetMatchAtIndex (path_with_object, 1, path) &&
585             regex_match.GetMatchAtIndex (path_with_object, 2, obj))
586         {
587             archive_file.SetFile (path.c_str(), false);
588             archive_object.SetCString(obj.c_str());
589             if (must_exist && !archive_file.Exists())
590                 return false;
591             return true;
592         }
593     }
594     return false;
595 }
596 
597 void
598 ObjectFile::ClearSymtab ()
599 {
600     ModuleSP module_sp(GetModule());
601     if (module_sp)
602     {
603         std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
604         Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
605         if (log)
606             log->Printf ("%p ObjectFile::ClearSymtab () symtab = %p",
607                          static_cast<void*>(this),
608                          static_cast<void*>(m_symtab_ap.get()));
609         m_symtab_ap.reset();
610     }
611 }
612 
613 SectionList *
614 ObjectFile::GetSectionList(bool update_module_section_list)
615 {
616     if (m_sections_ap.get() == nullptr)
617     {
618         if (update_module_section_list)
619         {
620             ModuleSP module_sp(GetModule());
621             if (module_sp)
622             {
623                 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
624                 CreateSections(*module_sp->GetUnifiedSectionList());
625             }
626         }
627         else
628         {
629             SectionList unified_section_list;
630             CreateSections(unified_section_list);
631         }
632     }
633     return m_sections_ap.get();
634 }
635 
636 lldb::SymbolType
637 ObjectFile::GetSymbolTypeFromName (llvm::StringRef name,
638                                    lldb::SymbolType symbol_type_hint)
639 {
640     if (!name.empty())
641     {
642         if (name.startswith("_OBJC_"))
643         {
644             // ObjC
645             if (name.startswith("_OBJC_CLASS_$_"))
646                 return lldb::eSymbolTypeObjCClass;
647             if (name.startswith("_OBJC_METACLASS_$_"))
648                 return lldb::eSymbolTypeObjCMetaClass;
649             if (name.startswith("_OBJC_IVAR_$_"))
650                 return lldb::eSymbolTypeObjCIVar;
651         }
652         else if (name.startswith(".objc_class_name_"))
653         {
654             // ObjC v1
655             return lldb::eSymbolTypeObjCClass;
656         }
657     }
658     return symbol_type_hint;
659 }
660 
661 ConstString
662 ObjectFile::GetNextSyntheticSymbolName()
663 {
664     StreamString ss;
665     ConstString file_name = GetModule()->GetFileSpec().GetFilename();
666     ss.Printf("___lldb_unnamed_symbol%u$$%s", ++m_synthetic_symbol_idx, file_name.GetCString());
667     return ConstString(ss.GetData());
668 }
669 
670