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/Symbol/ObjectFile.h"
11 #include "lldb/Core/Module.h"
12 #include "lldb/Core/ModuleSpec.h"
13 #include "lldb/Core/PluginManager.h"
14 #include "lldb/Core/Section.h"
15 #include "lldb/Symbol/ObjectContainer.h"
16 #include "lldb/Symbol/SymbolFile.h"
17 #include "lldb/Target/Process.h"
18 #include "lldb/Target/SectionLoadList.h"
19 #include "lldb/Target/Target.h"
20 #include "lldb/Utility/DataBuffer.h"
21 #include "lldb/Utility/DataBufferHeap.h"
22 #include "lldb/Utility/DataBufferLLVM.h"
23 #include "lldb/Utility/Log.h"
24 #include "lldb/Utility/RegularExpression.h"
25 #include "lldb/Utility/Timer.h"
26 #include "lldb/lldb-private.h"
27 
28 using namespace lldb;
29 using namespace lldb_private;
30 
31 ObjectFileSP
32 ObjectFile::FindPlugin(const lldb::ModuleSP &module_sp, const FileSpec *file,
33                        lldb::offset_t file_offset, lldb::offset_t file_size,
34                        DataBufferSP &data_sp, lldb::offset_t &data_offset) {
35   ObjectFileSP object_file_sp;
36 
37   if (module_sp) {
38     static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
39     Timer scoped_timer(
40         func_cat,
41         "ObjectFile::FindPlugin (module = %s, file = %p, file_offset = "
42         "0x%8.8" PRIx64 ", file_size = 0x%8.8" PRIx64 ")",
43         module_sp->GetFileSpec().GetPath().c_str(),
44         static_cast<const void *>(file), static_cast<uint64_t>(file_offset),
45         static_cast<uint64_t>(file_size));
46     if (file) {
47       FileSpec archive_file;
48       ObjectContainerCreateInstance create_object_container_callback;
49 
50       const bool file_exists = FileSystem::Instance().Exists(*file);
51       if (!data_sp) {
52         // We have an object name which most likely means we have a .o file in
53         // a static archive (.a file). Try and see if we have a cached archive
54         // first without reading any data first
55         if (file_exists && module_sp->GetObjectName()) {
56           for (uint32_t idx = 0;
57                (create_object_container_callback =
58                     PluginManager::GetObjectContainerCreateCallbackAtIndex(
59                         idx)) != nullptr;
60                ++idx) {
61             std::unique_ptr<ObjectContainer> object_container_ap(
62                 create_object_container_callback(module_sp, data_sp,
63                                                  data_offset, file, file_offset,
64                                                  file_size));
65 
66             if (object_container_ap.get())
67               object_file_sp = object_container_ap->GetObjectFile(file);
68 
69             if (object_file_sp.get())
70               return object_file_sp;
71           }
72         }
73         // Ok, we didn't find any containers that have a named object, now lets
74         // read the first 512 bytes from the file so the object file and object
75         // container plug-ins can use these bytes to see if they can parse this
76         // file.
77         if (file_size > 0) {
78           data_sp =
79               DataBufferLLVM::CreateSliceFromPath(file->GetPath(), 512, file_offset);
80           data_offset = 0;
81         }
82       }
83 
84       if (!data_sp || data_sp->GetByteSize() == 0) {
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,
88                                          sizeof(path_with_object));
89 
90         ConstString archive_object;
91         const bool must_exist = true;
92         if (ObjectFile::SplitArchivePathWithObject(
93                 path_with_object, archive_file, archive_object, must_exist)) {
94           file_size = FileSystem::Instance().GetByteSize(archive_file);
95           if (file_size > 0) {
96             file = &archive_file;
97             module_sp->SetFileSpecAndObjectName(archive_file, archive_object);
98             // Check if this is a object container by iterating through all
99             // object container plugin instances and then trying to get an
100             // object file from the container plugins since we had a name.
101             // Also, don't read
102             // ANY data in case there is data cached in the container plug-ins
103             // (like BSD archives caching the contained objects within an
104             // file).
105             for (uint32_t idx = 0;
106                  (create_object_container_callback =
107                       PluginManager::GetObjectContainerCreateCallbackAtIndex(
108                           idx)) != nullptr;
109                  ++idx) {
110               std::unique_ptr<ObjectContainer> object_container_ap(
111                   create_object_container_callback(module_sp, data_sp,
112                                                    data_offset, file,
113                                                    file_offset, file_size));
114 
115               if (object_container_ap.get())
116                 object_file_sp = object_container_ap->GetObjectFile(file);
117 
118               if (object_file_sp.get())
119                 return object_file_sp;
120             }
121             // We failed to find any cached object files in the container plug-
122             // ins, so lets read the first 512 bytes and try again below...
123             data_sp = DataBufferLLVM::CreateSliceFromPath(archive_file.GetPath(),
124                                                      512, file_offset);
125           }
126         }
127       }
128 
129       if (data_sp && data_sp->GetByteSize() > 0) {
130         // Check if this is a normal object file by iterating through all
131         // object file plugin instances.
132         ObjectFileCreateInstance create_object_file_callback;
133         for (uint32_t idx = 0;
134              (create_object_file_callback =
135                   PluginManager::GetObjectFileCreateCallbackAtIndex(idx)) !=
136              nullptr;
137              ++idx) {
138           object_file_sp.reset(create_object_file_callback(
139               module_sp, data_sp, data_offset, file, file_offset, file_size));
140           if (object_file_sp.get())
141             return object_file_sp;
142         }
143 
144         // Check if this is a object container by iterating through all object
145         // container plugin instances and then trying to get an object file
146         // from the container.
147         for (uint32_t idx = 0;
148              (create_object_container_callback =
149                   PluginManager::GetObjectContainerCreateCallbackAtIndex(
150                       idx)) != nullptr;
151              ++idx) {
152           std::unique_ptr<ObjectContainer> object_container_ap(
153               create_object_container_callback(module_sp, data_sp, data_offset,
154                                                file, file_offset, file_size));
155 
156           if (object_container_ap.get())
157             object_file_sp = object_container_ap->GetObjectFile(file);
158 
159           if (object_file_sp.get())
160             return object_file_sp;
161         }
162       }
163     }
164   }
165   // We didn't find it, so clear our shared pointer in case it contains
166   // anything and return an empty shared pointer
167   object_file_sp.reset();
168   return object_file_sp;
169 }
170 
171 ObjectFileSP ObjectFile::FindPlugin(const lldb::ModuleSP &module_sp,
172                                     const ProcessSP &process_sp,
173                                     lldb::addr_t header_addr,
174                                     DataBufferSP &data_sp) {
175   ObjectFileSP object_file_sp;
176 
177   if (module_sp) {
178     static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
179     Timer scoped_timer(func_cat,
180                        "ObjectFile::FindPlugin (module = "
181                        "%s, process = %p, header_addr = "
182                        "0x%" PRIx64 ")",
183                        module_sp->GetFileSpec().GetPath().c_str(),
184                        static_cast<void *>(process_sp.get()), header_addr);
185     uint32_t idx;
186 
187     // Check if this is a normal object file by iterating through all object
188     // file plugin instances.
189     ObjectFileCreateMemoryInstance create_callback;
190     for (idx = 0;
191          (create_callback =
192               PluginManager::GetObjectFileCreateMemoryCallbackAtIndex(idx)) !=
193          nullptr;
194          ++idx) {
195       object_file_sp.reset(
196           create_callback(module_sp, data_sp, process_sp, header_addr));
197       if (object_file_sp.get())
198         return object_file_sp;
199     }
200   }
201 
202   // We didn't find it, so clear our shared pointer in case it contains
203   // anything and return an empty shared pointer
204   object_file_sp.reset();
205   return object_file_sp;
206 }
207 
208 size_t ObjectFile::GetModuleSpecifications(const FileSpec &file,
209                                            lldb::offset_t file_offset,
210                                            lldb::offset_t file_size,
211                                            ModuleSpecList &specs) {
212   DataBufferSP data_sp = DataBufferLLVM::CreateSliceFromPath(file.GetPath(), 512, file_offset);
213   if (data_sp) {
214     if (file_size == 0) {
215       const lldb::offset_t actual_file_size =
216           FileSystem::Instance().GetByteSize(file);
217       if (actual_file_size > file_offset)
218         file_size = actual_file_size - file_offset;
219     }
220     return ObjectFile::GetModuleSpecifications(file,        // file spec
221                                                data_sp,     // data bytes
222                                                0,           // data offset
223                                                file_offset, // file offset
224                                                file_size,   // file length
225                                                specs);
226   }
227   return 0;
228 }
229 
230 size_t ObjectFile::GetModuleSpecifications(
231     const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
232     lldb::offset_t data_offset, lldb::offset_t file_offset,
233     lldb::offset_t file_size, lldb_private::ModuleSpecList &specs) {
234   const size_t initial_count = specs.GetSize();
235   ObjectFileGetModuleSpecifications callback;
236   uint32_t i;
237   // Try the ObjectFile plug-ins
238   for (i = 0;
239        (callback =
240             PluginManager::GetObjectFileGetModuleSpecificationsCallbackAtIndex(
241                 i)) != nullptr;
242        ++i) {
243     if (callback(file, data_sp, data_offset, file_offset, file_size, specs) > 0)
244       return specs.GetSize() - initial_count;
245   }
246 
247   // Try the ObjectContainer plug-ins
248   for (i = 0;
249        (callback = PluginManager::
250             GetObjectContainerGetModuleSpecificationsCallbackAtIndex(i)) !=
251        nullptr;
252        ++i) {
253     if (callback(file, data_sp, data_offset, file_offset, file_size, specs) > 0)
254       return specs.GetSize() - initial_count;
255   }
256   return 0;
257 }
258 
259 ObjectFile::ObjectFile(const lldb::ModuleSP &module_sp,
260                        const FileSpec *file_spec_ptr,
261                        lldb::offset_t file_offset, lldb::offset_t length,
262                        const lldb::DataBufferSP &data_sp,
263                        lldb::offset_t data_offset)
264     : ModuleChild(module_sp),
265       m_file(), // This file could be different from the original module's file
266       m_type(eTypeInvalid), m_strata(eStrataInvalid),
267       m_file_offset(file_offset), m_length(length), m_data(),
268       m_unwind_table(*this), m_process_wp(),
269       m_memory_addr(LLDB_INVALID_ADDRESS), m_sections_ap(), m_symtab_ap(),
270       m_synthetic_symbol_idx(0) {
271   if (file_spec_ptr)
272     m_file = *file_spec_ptr;
273   if (data_sp)
274     m_data.SetData(data_sp, data_offset, length);
275   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
276   if (log)
277     log->Printf("%p ObjectFile::ObjectFile() module = %p (%s), file = %s, "
278                 "file_offset = 0x%8.8" PRIx64 ", size = %" PRIu64,
279                 static_cast<void *>(this), static_cast<void *>(module_sp.get()),
280                 module_sp->GetSpecificationDescription().c_str(),
281                 m_file ? m_file.GetPath().c_str() : "<NULL>", m_file_offset,
282                 m_length);
283 }
284 
285 ObjectFile::ObjectFile(const lldb::ModuleSP &module_sp,
286                        const ProcessSP &process_sp, lldb::addr_t header_addr,
287                        DataBufferSP &header_data_sp)
288     : ModuleChild(module_sp), m_file(), m_type(eTypeInvalid),
289       m_strata(eStrataInvalid), m_file_offset(0), m_length(0), m_data(),
290       m_unwind_table(*this), m_process_wp(process_sp),
291       m_memory_addr(header_addr), m_sections_ap(), m_symtab_ap(),
292       m_synthetic_symbol_idx(0) {
293   if (header_data_sp)
294     m_data.SetData(header_data_sp, 0, header_data_sp->GetByteSize());
295   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
296   if (log)
297     log->Printf("%p ObjectFile::ObjectFile() module = %p (%s), process = %p, "
298                 "header_addr = 0x%" PRIx64,
299                 static_cast<void *>(this), static_cast<void *>(module_sp.get()),
300                 module_sp->GetSpecificationDescription().c_str(),
301                 static_cast<void *>(process_sp.get()), m_memory_addr);
302 }
303 
304 ObjectFile::~ObjectFile() {
305   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
306   if (log)
307     log->Printf("%p ObjectFile::~ObjectFile ()\n", static_cast<void *>(this));
308 }
309 
310 bool ObjectFile::SetModulesArchitecture(const ArchSpec &new_arch) {
311   ModuleSP module_sp(GetModule());
312   if (module_sp)
313     return module_sp->SetArchitecture(new_arch);
314   return false;
315 }
316 
317 AddressClass ObjectFile::GetAddressClass(addr_t file_addr) {
318   Symtab *symtab = GetSymtab();
319   if (symtab) {
320     Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr);
321     if (symbol) {
322       if (symbol->ValueIsAddress()) {
323         const SectionSP section_sp(symbol->GetAddressRef().GetSection());
324         if (section_sp) {
325           const SectionType section_type = section_sp->GetType();
326           switch (section_type) {
327           case eSectionTypeInvalid:
328             return AddressClass::eUnknown;
329           case eSectionTypeCode:
330             return AddressClass::eCode;
331           case eSectionTypeContainer:
332             return AddressClass::eUnknown;
333           case eSectionTypeData:
334           case eSectionTypeDataCString:
335           case eSectionTypeDataCStringPointers:
336           case eSectionTypeDataSymbolAddress:
337           case eSectionTypeData4:
338           case eSectionTypeData8:
339           case eSectionTypeData16:
340           case eSectionTypeDataPointers:
341           case eSectionTypeZeroFill:
342           case eSectionTypeDataObjCMessageRefs:
343           case eSectionTypeDataObjCCFStrings:
344           case eSectionTypeGoSymtab:
345             return AddressClass::eData;
346           case eSectionTypeDebug:
347           case eSectionTypeDWARFDebugAbbrev:
348           case eSectionTypeDWARFDebugAddr:
349           case eSectionTypeDWARFDebugAranges:
350           case eSectionTypeDWARFDebugCuIndex:
351           case eSectionTypeDWARFDebugFrame:
352           case eSectionTypeDWARFDebugInfo:
353           case eSectionTypeDWARFDebugLine:
354           case eSectionTypeDWARFDebugLineStr:
355           case eSectionTypeDWARFDebugLoc:
356           case eSectionTypeDWARFDebugLocLists:
357           case eSectionTypeDWARFDebugMacInfo:
358           case eSectionTypeDWARFDebugMacro:
359           case eSectionTypeDWARFDebugNames:
360           case eSectionTypeDWARFDebugPubNames:
361           case eSectionTypeDWARFDebugPubTypes:
362           case eSectionTypeDWARFDebugRanges:
363           case eSectionTypeDWARFDebugRngLists:
364           case eSectionTypeDWARFDebugStr:
365           case eSectionTypeDWARFDebugStrOffsets:
366           case eSectionTypeDWARFDebugTypes:
367           case eSectionTypeDWARFAppleNames:
368           case eSectionTypeDWARFAppleTypes:
369           case eSectionTypeDWARFAppleNamespaces:
370           case eSectionTypeDWARFAppleObjC:
371           case eSectionTypeDWARFGNUDebugAltLink:
372             return AddressClass::eDebug;
373           case eSectionTypeEHFrame:
374           case eSectionTypeARMexidx:
375           case eSectionTypeARMextab:
376           case eSectionTypeCompactUnwind:
377             return AddressClass::eRuntime;
378           case eSectionTypeELFSymbolTable:
379           case eSectionTypeELFDynamicSymbols:
380           case eSectionTypeELFRelocationEntries:
381           case eSectionTypeELFDynamicLinkInfo:
382           case eSectionTypeOther:
383             return AddressClass::eUnknown;
384           case eSectionTypeAbsoluteAddress:
385             // In case of absolute sections decide the address class based on
386             // the symbol type because the section type isn't specify if it is
387             // a code or a data section.
388             break;
389           }
390         }
391       }
392 
393       const SymbolType symbol_type = symbol->GetType();
394       switch (symbol_type) {
395       case eSymbolTypeAny:
396         return AddressClass::eUnknown;
397       case eSymbolTypeAbsolute:
398         return AddressClass::eUnknown;
399       case eSymbolTypeCode:
400         return AddressClass::eCode;
401       case eSymbolTypeTrampoline:
402         return AddressClass::eCode;
403       case eSymbolTypeResolver:
404         return AddressClass::eCode;
405       case eSymbolTypeData:
406         return AddressClass::eData;
407       case eSymbolTypeRuntime:
408         return AddressClass::eRuntime;
409       case eSymbolTypeException:
410         return AddressClass::eRuntime;
411       case eSymbolTypeSourceFile:
412         return AddressClass::eDebug;
413       case eSymbolTypeHeaderFile:
414         return AddressClass::eDebug;
415       case eSymbolTypeObjectFile:
416         return AddressClass::eDebug;
417       case eSymbolTypeCommonBlock:
418         return AddressClass::eDebug;
419       case eSymbolTypeBlock:
420         return AddressClass::eDebug;
421       case eSymbolTypeLocal:
422         return AddressClass::eData;
423       case eSymbolTypeParam:
424         return AddressClass::eData;
425       case eSymbolTypeVariable:
426         return AddressClass::eData;
427       case eSymbolTypeVariableType:
428         return AddressClass::eDebug;
429       case eSymbolTypeLineEntry:
430         return AddressClass::eDebug;
431       case eSymbolTypeLineHeader:
432         return AddressClass::eDebug;
433       case eSymbolTypeScopeBegin:
434         return AddressClass::eDebug;
435       case eSymbolTypeScopeEnd:
436         return AddressClass::eDebug;
437       case eSymbolTypeAdditional:
438         return AddressClass::eUnknown;
439       case eSymbolTypeCompiler:
440         return AddressClass::eDebug;
441       case eSymbolTypeInstrumentation:
442         return AddressClass::eDebug;
443       case eSymbolTypeUndefined:
444         return AddressClass::eUnknown;
445       case eSymbolTypeObjCClass:
446         return AddressClass::eRuntime;
447       case eSymbolTypeObjCMetaClass:
448         return AddressClass::eRuntime;
449       case eSymbolTypeObjCIVar:
450         return AddressClass::eRuntime;
451       case eSymbolTypeReExported:
452         return AddressClass::eRuntime;
453       }
454     }
455   }
456   return AddressClass::eUnknown;
457 }
458 
459 DataBufferSP ObjectFile::ReadMemory(const ProcessSP &process_sp,
460                                     lldb::addr_t addr, size_t byte_size) {
461   DataBufferSP data_sp;
462   if (process_sp) {
463     std::unique_ptr<DataBufferHeap> data_ap(new DataBufferHeap(byte_size, 0));
464     Status error;
465     const size_t bytes_read = process_sp->ReadMemory(
466         addr, data_ap->GetBytes(), data_ap->GetByteSize(), error);
467     if (bytes_read == byte_size)
468       data_sp.reset(data_ap.release());
469   }
470   return data_sp;
471 }
472 
473 size_t ObjectFile::GetData(lldb::offset_t offset, size_t length,
474                            DataExtractor &data) const {
475   // The entire file has already been mmap'ed into m_data, so just copy from
476   // there as the back mmap buffer will be shared with shared pointers.
477   return data.SetData(m_data, offset, length);
478 }
479 
480 size_t ObjectFile::CopyData(lldb::offset_t offset, size_t length,
481                             void *dst) const {
482   // The entire file has already been mmap'ed into m_data, so just copy from
483   // there Note that the data remains in target byte order.
484   return m_data.CopyData(offset, length, dst);
485 }
486 
487 size_t ObjectFile::ReadSectionData(Section *section,
488                                    lldb::offset_t section_offset, void *dst,
489                                    size_t dst_len) {
490   assert(section);
491   section_offset *= section->GetTargetByteSize();
492 
493   // If some other objectfile owns this data, pass this to them.
494   if (section->GetObjectFile() != this)
495     return section->GetObjectFile()->ReadSectionData(section, section_offset,
496                                                      dst, dst_len);
497 
498   if (IsInMemory()) {
499     ProcessSP process_sp(m_process_wp.lock());
500     if (process_sp) {
501       Status error;
502       const addr_t base_load_addr =
503           section->GetLoadBaseAddress(&process_sp->GetTarget());
504       if (base_load_addr != LLDB_INVALID_ADDRESS)
505         return process_sp->ReadMemory(base_load_addr + section_offset, dst,
506                                       dst_len, error);
507     }
508   } else {
509     if (!section->IsRelocated())
510       RelocateSection(section);
511 
512     const lldb::offset_t section_file_size = section->GetFileSize();
513     if (section_offset < section_file_size) {
514       const size_t section_bytes_left = section_file_size - section_offset;
515       size_t section_dst_len = dst_len;
516       if (section_dst_len > section_bytes_left)
517         section_dst_len = section_bytes_left;
518       return CopyData(section->GetFileOffset() + section_offset,
519                       section_dst_len, dst);
520     } else {
521       if (section->GetType() == eSectionTypeZeroFill) {
522         const uint64_t section_size = section->GetByteSize();
523         const uint64_t section_bytes_left = section_size - section_offset;
524         uint64_t section_dst_len = dst_len;
525         if (section_dst_len > section_bytes_left)
526           section_dst_len = section_bytes_left;
527         memset(dst, 0, section_dst_len);
528         return section_dst_len;
529       }
530     }
531   }
532   return 0;
533 }
534 
535 //----------------------------------------------------------------------
536 // Get the section data the file on disk
537 //----------------------------------------------------------------------
538 size_t ObjectFile::ReadSectionData(Section *section,
539                                    DataExtractor &section_data) {
540   // If some other objectfile owns this data, pass this to them.
541   if (section->GetObjectFile() != this)
542     return section->GetObjectFile()->ReadSectionData(section, section_data);
543 
544   if (IsInMemory()) {
545     ProcessSP process_sp(m_process_wp.lock());
546     if (process_sp) {
547       const addr_t base_load_addr =
548           section->GetLoadBaseAddress(&process_sp->GetTarget());
549       if (base_load_addr != LLDB_INVALID_ADDRESS) {
550         DataBufferSP data_sp(
551             ReadMemory(process_sp, base_load_addr, section->GetByteSize()));
552         if (data_sp) {
553           section_data.SetData(data_sp, 0, data_sp->GetByteSize());
554           section_data.SetByteOrder(process_sp->GetByteOrder());
555           section_data.SetAddressByteSize(process_sp->GetAddressByteSize());
556           return section_data.GetByteSize();
557         }
558       }
559     }
560     return GetData(section->GetFileOffset(), section->GetFileSize(),
561                    section_data);
562   } else {
563     // The object file now contains a full mmap'ed copy of the object file
564     // data, so just use this
565     if (!section->IsRelocated())
566       RelocateSection(section);
567 
568     return GetData(section->GetFileOffset(), section->GetFileSize(),
569                    section_data);
570   }
571 }
572 
573 bool ObjectFile::SplitArchivePathWithObject(const char *path_with_object,
574                                             FileSpec &archive_file,
575                                             ConstString &archive_object,
576                                             bool must_exist) {
577   RegularExpression g_object_regex(llvm::StringRef("(.*)\\(([^\\)]+)\\)$"));
578   RegularExpression::Match regex_match(2);
579   if (g_object_regex.Execute(llvm::StringRef::withNullAsEmpty(path_with_object),
580                              &regex_match)) {
581     std::string path;
582     std::string obj;
583     if (regex_match.GetMatchAtIndex(path_with_object, 1, path) &&
584         regex_match.GetMatchAtIndex(path_with_object, 2, obj)) {
585       archive_file.SetFile(path, FileSpec::Style::native);
586       archive_object.SetCString(obj.c_str());
587       if (must_exist && !FileSystem::Instance().Exists(archive_file))
588         return false;
589       return true;
590     }
591   }
592   return false;
593 }
594 
595 void ObjectFile::ClearSymtab() {
596   ModuleSP module_sp(GetModule());
597   if (module_sp) {
598     std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
599     Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
600     if (log)
601       log->Printf("%p ObjectFile::ClearSymtab () symtab = %p",
602                   static_cast<void *>(this),
603                   static_cast<void *>(m_symtab_ap.get()));
604     m_symtab_ap.reset();
605   }
606 }
607 
608 SectionList *ObjectFile::GetSectionList(bool update_module_section_list) {
609   if (m_sections_ap.get() == nullptr) {
610     if (update_module_section_list) {
611       ModuleSP module_sp(GetModule());
612       if (module_sp) {
613         std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
614         CreateSections(*module_sp->GetUnifiedSectionList());
615       }
616     } else {
617       SectionList unified_section_list;
618       CreateSections(unified_section_list);
619     }
620   }
621   return m_sections_ap.get();
622 }
623 
624 lldb::SymbolType
625 ObjectFile::GetSymbolTypeFromName(llvm::StringRef name,
626                                   lldb::SymbolType symbol_type_hint) {
627   if (!name.empty()) {
628     if (name.startswith("_OBJC_")) {
629       // ObjC
630       if (name.startswith("_OBJC_CLASS_$_"))
631         return lldb::eSymbolTypeObjCClass;
632       if (name.startswith("_OBJC_METACLASS_$_"))
633         return lldb::eSymbolTypeObjCMetaClass;
634       if (name.startswith("_OBJC_IVAR_$_"))
635         return lldb::eSymbolTypeObjCIVar;
636     } else if (name.startswith(".objc_class_name_")) {
637       // ObjC v1
638       return lldb::eSymbolTypeObjCClass;
639     }
640   }
641   return symbol_type_hint;
642 }
643 
644 ConstString ObjectFile::GetNextSyntheticSymbolName() {
645   StreamString ss;
646   ConstString file_name = GetModule()->GetFileSpec().GetFilename();
647   ss.Printf("___lldb_unnamed_symbol%u$$%s", ++m_synthetic_symbol_idx,
648             file_name.GetCString());
649   return ConstString(ss.GetString());
650 }
651 
652 std::vector<ObjectFile::LoadableData>
653 ObjectFile::GetLoadableData(Target &target) {
654   std::vector<LoadableData> loadables;
655   SectionList *section_list = GetSectionList();
656   if (!section_list)
657     return loadables;
658   // Create a list of loadable data from loadable sections
659   size_t section_count = section_list->GetNumSections(0);
660   for (size_t i = 0; i < section_count; ++i) {
661     LoadableData loadable;
662     SectionSP section_sp = section_list->GetSectionAtIndex(i);
663     loadable.Dest =
664         target.GetSectionLoadList().GetSectionLoadAddress(section_sp);
665     if (loadable.Dest == LLDB_INVALID_ADDRESS)
666       continue;
667     // We can skip sections like bss
668     if (section_sp->GetFileSize() == 0)
669       continue;
670     DataExtractor section_data;
671     section_sp->GetSectionData(section_data);
672     loadable.Contents = llvm::ArrayRef<uint8_t>(section_data.GetDataStart(),
673                                                 section_data.GetByteSize());
674     loadables.push_back(loadable);
675   }
676   return loadables;
677 }
678 
679 void ObjectFile::RelocateSection(lldb_private::Section *section)
680 {
681 }
682 
683 DataBufferSP ObjectFile::MapFileData(const FileSpec &file, uint64_t Size,
684                                      uint64_t Offset) {
685   return DataBufferLLVM::CreateSliceFromPath(file.GetPath(), Size, Offset);
686 }
687