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 = file->Exists();
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 = archive_file.GetByteSize();
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 = file.GetByteSize();
216       if (actual_file_size > file_offset)
217         file_size = actual_file_size - file_offset;
218     }
219     return ObjectFile::GetModuleSpecifications(file,        // file spec
220                                                data_sp,     // data bytes
221                                                0,           // data offset
222                                                file_offset, // file offset
223                                                file_size,   // file length
224                                                specs);
225   }
226   return 0;
227 }
228 
229 size_t ObjectFile::GetModuleSpecifications(
230     const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
231     lldb::offset_t data_offset, lldb::offset_t file_offset,
232     lldb::offset_t file_size, lldb_private::ModuleSpecList &specs) {
233   const size_t initial_count = specs.GetSize();
234   ObjectFileGetModuleSpecifications callback;
235   uint32_t i;
236   // Try the ObjectFile plug-ins
237   for (i = 0;
238        (callback =
239             PluginManager::GetObjectFileGetModuleSpecificationsCallbackAtIndex(
240                 i)) != nullptr;
241        ++i) {
242     if (callback(file, data_sp, data_offset, file_offset, file_size, specs) > 0)
243       return specs.GetSize() - initial_count;
244   }
245 
246   // Try the ObjectContainer plug-ins
247   for (i = 0;
248        (callback = PluginManager::
249             GetObjectContainerGetModuleSpecificationsCallbackAtIndex(i)) !=
250        nullptr;
251        ++i) {
252     if (callback(file, data_sp, data_offset, file_offset, file_size, specs) > 0)
253       return specs.GetSize() - initial_count;
254   }
255   return 0;
256 }
257 
258 ObjectFile::ObjectFile(const lldb::ModuleSP &module_sp,
259                        const FileSpec *file_spec_ptr,
260                        lldb::offset_t file_offset, lldb::offset_t length,
261                        const lldb::DataBufferSP &data_sp,
262                        lldb::offset_t data_offset)
263     : ModuleChild(module_sp),
264       m_file(), // This file could be different from the original module's file
265       m_type(eTypeInvalid), m_strata(eStrataInvalid),
266       m_file_offset(file_offset), m_length(length), m_data(),
267       m_unwind_table(*this), m_process_wp(),
268       m_memory_addr(LLDB_INVALID_ADDRESS), m_sections_ap(), m_symtab_ap(),
269       m_synthetic_symbol_idx(0) {
270   if (file_spec_ptr)
271     m_file = *file_spec_ptr;
272   if (data_sp)
273     m_data.SetData(data_sp, data_offset, length);
274   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
275   if (log)
276     log->Printf("%p ObjectFile::ObjectFile() module = %p (%s), file = %s, "
277                 "file_offset = 0x%8.8" PRIx64 ", size = %" PRIu64,
278                 static_cast<void *>(this), static_cast<void *>(module_sp.get()),
279                 module_sp->GetSpecificationDescription().c_str(),
280                 m_file ? m_file.GetPath().c_str() : "<NULL>", m_file_offset,
281                 m_length);
282 }
283 
284 ObjectFile::ObjectFile(const lldb::ModuleSP &module_sp,
285                        const ProcessSP &process_sp, lldb::addr_t header_addr,
286                        DataBufferSP &header_data_sp)
287     : ModuleChild(module_sp), m_file(), m_type(eTypeInvalid),
288       m_strata(eStrataInvalid), m_file_offset(0), m_length(0), m_data(),
289       m_unwind_table(*this), m_process_wp(process_sp),
290       m_memory_addr(header_addr), m_sections_ap(), m_symtab_ap(),
291       m_synthetic_symbol_idx(0) {
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, "
297                 "header_addr = 0x%" PRIx64,
298                 static_cast<void *>(this), 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 ObjectFile::~ObjectFile() {
304   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
305   if (log)
306     log->Printf("%p ObjectFile::~ObjectFile ()\n", static_cast<void *>(this));
307 }
308 
309 bool ObjectFile::SetModulesArchitecture(const ArchSpec &new_arch) {
310   ModuleSP module_sp(GetModule());
311   if (module_sp)
312     return module_sp->SetArchitecture(new_arch);
313   return false;
314 }
315 
316 AddressClass ObjectFile::GetAddressClass(addr_t file_addr) {
317   Symtab *symtab = GetSymtab();
318   if (symtab) {
319     Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr);
320     if (symbol) {
321       if (symbol->ValueIsAddress()) {
322         const SectionSP section_sp(symbol->GetAddressRef().GetSection());
323         if (section_sp) {
324           const SectionType section_type = section_sp->GetType();
325           switch (section_type) {
326           case eSectionTypeInvalid:
327             return AddressClass::eUnknown;
328           case eSectionTypeCode:
329             return AddressClass::eCode;
330           case eSectionTypeContainer:
331             return AddressClass::eUnknown;
332           case eSectionTypeData:
333           case eSectionTypeDataCString:
334           case eSectionTypeDataCStringPointers:
335           case eSectionTypeDataSymbolAddress:
336           case eSectionTypeData4:
337           case eSectionTypeData8:
338           case eSectionTypeData16:
339           case eSectionTypeDataPointers:
340           case eSectionTypeZeroFill:
341           case eSectionTypeDataObjCMessageRefs:
342           case eSectionTypeDataObjCCFStrings:
343           case eSectionTypeGoSymtab:
344             return AddressClass::eData;
345           case eSectionTypeDebug:
346           case eSectionTypeDWARFDebugAbbrev:
347           case eSectionTypeDWARFDebugAddr:
348           case eSectionTypeDWARFDebugAranges:
349           case eSectionTypeDWARFDebugCuIndex:
350           case eSectionTypeDWARFDebugFrame:
351           case eSectionTypeDWARFDebugInfo:
352           case eSectionTypeDWARFDebugLine:
353           case eSectionTypeDWARFDebugLoc:
354           case eSectionTypeDWARFDebugMacInfo:
355           case eSectionTypeDWARFDebugMacro:
356           case eSectionTypeDWARFDebugNames:
357           case eSectionTypeDWARFDebugPubNames:
358           case eSectionTypeDWARFDebugPubTypes:
359           case eSectionTypeDWARFDebugRanges:
360           case eSectionTypeDWARFDebugStr:
361           case eSectionTypeDWARFDebugStrOffsets:
362           case eSectionTypeDWARFDebugTypes:
363           case eSectionTypeDWARFAppleNames:
364           case eSectionTypeDWARFAppleTypes:
365           case eSectionTypeDWARFAppleNamespaces:
366           case eSectionTypeDWARFAppleObjC:
367           case eSectionTypeDWARFGNUDebugAltLink:
368             return AddressClass::eDebug;
369           case eSectionTypeEHFrame:
370           case eSectionTypeARMexidx:
371           case eSectionTypeARMextab:
372           case eSectionTypeCompactUnwind:
373             return AddressClass::eRuntime;
374           case eSectionTypeELFSymbolTable:
375           case eSectionTypeELFDynamicSymbols:
376           case eSectionTypeELFRelocationEntries:
377           case eSectionTypeELFDynamicLinkInfo:
378           case eSectionTypeOther:
379             return AddressClass::eUnknown;
380           case eSectionTypeAbsoluteAddress:
381             // In case of absolute sections decide the address class based on
382             // the symbol type because the section type isn't specify if it is
383             // a code or a data section.
384             break;
385           }
386         }
387       }
388 
389       const SymbolType symbol_type = symbol->GetType();
390       switch (symbol_type) {
391       case eSymbolTypeAny:
392         return AddressClass::eUnknown;
393       case eSymbolTypeAbsolute:
394         return AddressClass::eUnknown;
395       case eSymbolTypeCode:
396         return AddressClass::eCode;
397       case eSymbolTypeTrampoline:
398         return AddressClass::eCode;
399       case eSymbolTypeResolver:
400         return AddressClass::eCode;
401       case eSymbolTypeData:
402         return AddressClass::eData;
403       case eSymbolTypeRuntime:
404         return AddressClass::eRuntime;
405       case eSymbolTypeException:
406         return AddressClass::eRuntime;
407       case eSymbolTypeSourceFile:
408         return AddressClass::eDebug;
409       case eSymbolTypeHeaderFile:
410         return AddressClass::eDebug;
411       case eSymbolTypeObjectFile:
412         return AddressClass::eDebug;
413       case eSymbolTypeCommonBlock:
414         return AddressClass::eDebug;
415       case eSymbolTypeBlock:
416         return AddressClass::eDebug;
417       case eSymbolTypeLocal:
418         return AddressClass::eData;
419       case eSymbolTypeParam:
420         return AddressClass::eData;
421       case eSymbolTypeVariable:
422         return AddressClass::eData;
423       case eSymbolTypeVariableType:
424         return AddressClass::eDebug;
425       case eSymbolTypeLineEntry:
426         return AddressClass::eDebug;
427       case eSymbolTypeLineHeader:
428         return AddressClass::eDebug;
429       case eSymbolTypeScopeBegin:
430         return AddressClass::eDebug;
431       case eSymbolTypeScopeEnd:
432         return AddressClass::eDebug;
433       case eSymbolTypeAdditional:
434         return AddressClass::eUnknown;
435       case eSymbolTypeCompiler:
436         return AddressClass::eDebug;
437       case eSymbolTypeInstrumentation:
438         return AddressClass::eDebug;
439       case eSymbolTypeUndefined:
440         return AddressClass::eUnknown;
441       case eSymbolTypeObjCClass:
442         return AddressClass::eRuntime;
443       case eSymbolTypeObjCMetaClass:
444         return AddressClass::eRuntime;
445       case eSymbolTypeObjCIVar:
446         return AddressClass::eRuntime;
447       case eSymbolTypeReExported:
448         return AddressClass::eRuntime;
449       }
450     }
451   }
452   return AddressClass::eUnknown;
453 }
454 
455 DataBufferSP ObjectFile::ReadMemory(const ProcessSP &process_sp,
456                                     lldb::addr_t addr, size_t byte_size) {
457   DataBufferSP data_sp;
458   if (process_sp) {
459     std::unique_ptr<DataBufferHeap> data_ap(new DataBufferHeap(byte_size, 0));
460     Status error;
461     const size_t bytes_read = process_sp->ReadMemory(
462         addr, data_ap->GetBytes(), data_ap->GetByteSize(), error);
463     if (bytes_read == byte_size)
464       data_sp.reset(data_ap.release());
465   }
466   return data_sp;
467 }
468 
469 size_t ObjectFile::GetData(lldb::offset_t offset, size_t length,
470                            DataExtractor &data) const {
471   // The entire file has already been mmap'ed into m_data, so just copy from
472   // there as the back mmap buffer will be shared with shared pointers.
473   return data.SetData(m_data, offset, length);
474 }
475 
476 size_t ObjectFile::CopyData(lldb::offset_t offset, size_t length,
477                             void *dst) const {
478   // The entire file has already been mmap'ed into m_data, so just copy from
479   // there Note that the data remains in target byte order.
480   return m_data.CopyData(offset, length, dst);
481 }
482 
483 size_t ObjectFile::ReadSectionData(Section *section,
484                                    lldb::offset_t section_offset, void *dst,
485                                    size_t dst_len) {
486   assert(section);
487   section_offset *= section->GetTargetByteSize();
488 
489   // If some other objectfile owns this data, pass this to them.
490   if (section->GetObjectFile() != this)
491     return section->GetObjectFile()->ReadSectionData(section, section_offset,
492                                                      dst, dst_len);
493 
494   if (IsInMemory()) {
495     ProcessSP process_sp(m_process_wp.lock());
496     if (process_sp) {
497       Status error;
498       const addr_t base_load_addr =
499           section->GetLoadBaseAddress(&process_sp->GetTarget());
500       if (base_load_addr != LLDB_INVALID_ADDRESS)
501         return process_sp->ReadMemory(base_load_addr + section_offset, dst,
502                                       dst_len, error);
503     }
504   } else {
505     if (!section->IsRelocated())
506       RelocateSection(section);
507 
508     const lldb::offset_t section_file_size = section->GetFileSize();
509     if (section_offset < section_file_size) {
510       const size_t section_bytes_left = section_file_size - section_offset;
511       size_t section_dst_len = dst_len;
512       if (section_dst_len > section_bytes_left)
513         section_dst_len = section_bytes_left;
514       return CopyData(section->GetFileOffset() + section_offset,
515                       section_dst_len, dst);
516     } else {
517       if (section->GetType() == eSectionTypeZeroFill) {
518         const uint64_t section_size = section->GetByteSize();
519         const uint64_t section_bytes_left = section_size - section_offset;
520         uint64_t section_dst_len = dst_len;
521         if (section_dst_len > section_bytes_left)
522           section_dst_len = section_bytes_left;
523         memset(dst, 0, section_dst_len);
524         return section_dst_len;
525       }
526     }
527   }
528   return 0;
529 }
530 
531 //----------------------------------------------------------------------
532 // Get the section data the file on disk
533 //----------------------------------------------------------------------
534 size_t ObjectFile::ReadSectionData(Section *section,
535                                    DataExtractor &section_data) {
536   // If some other objectfile owns this data, pass this to them.
537   if (section->GetObjectFile() != this)
538     return section->GetObjectFile()->ReadSectionData(section, section_data);
539 
540   if (IsInMemory()) {
541     ProcessSP process_sp(m_process_wp.lock());
542     if (process_sp) {
543       const addr_t base_load_addr =
544           section->GetLoadBaseAddress(&process_sp->GetTarget());
545       if (base_load_addr != LLDB_INVALID_ADDRESS) {
546         DataBufferSP data_sp(
547             ReadMemory(process_sp, base_load_addr, section->GetByteSize()));
548         if (data_sp) {
549           section_data.SetData(data_sp, 0, data_sp->GetByteSize());
550           section_data.SetByteOrder(process_sp->GetByteOrder());
551           section_data.SetAddressByteSize(process_sp->GetAddressByteSize());
552           return section_data.GetByteSize();
553         }
554       }
555     }
556     return GetData(section->GetFileOffset(), section->GetFileSize(),
557                    section_data);
558   } else {
559     // The object file now contains a full mmap'ed copy of the object file
560     // data, so just use this
561     if (!section->IsRelocated())
562       RelocateSection(section);
563 
564     return GetData(section->GetFileOffset(), section->GetFileSize(),
565                    section_data);
566   }
567 }
568 
569 bool ObjectFile::SplitArchivePathWithObject(const char *path_with_object,
570                                             FileSpec &archive_file,
571                                             ConstString &archive_object,
572                                             bool must_exist) {
573   RegularExpression g_object_regex(llvm::StringRef("(.*)\\(([^\\)]+)\\)$"));
574   RegularExpression::Match regex_match(2);
575   if (g_object_regex.Execute(llvm::StringRef::withNullAsEmpty(path_with_object),
576                              &regex_match)) {
577     std::string path;
578     std::string obj;
579     if (regex_match.GetMatchAtIndex(path_with_object, 1, path) &&
580         regex_match.GetMatchAtIndex(path_with_object, 2, obj)) {
581       archive_file.SetFile(path, false, FileSpec::Style::native);
582       archive_object.SetCString(obj.c_str());
583       if (must_exist && !archive_file.Exists())
584         return false;
585       return true;
586     }
587   }
588   return false;
589 }
590 
591 void ObjectFile::ClearSymtab() {
592   ModuleSP module_sp(GetModule());
593   if (module_sp) {
594     std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
595     Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
596     if (log)
597       log->Printf("%p ObjectFile::ClearSymtab () symtab = %p",
598                   static_cast<void *>(this),
599                   static_cast<void *>(m_symtab_ap.get()));
600     m_symtab_ap.reset();
601   }
602 }
603 
604 SectionList *ObjectFile::GetSectionList(bool update_module_section_list) {
605   if (m_sections_ap.get() == nullptr) {
606     if (update_module_section_list) {
607       ModuleSP module_sp(GetModule());
608       if (module_sp) {
609         std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
610         CreateSections(*module_sp->GetUnifiedSectionList());
611       }
612     } else {
613       SectionList unified_section_list;
614       CreateSections(unified_section_list);
615     }
616   }
617   return m_sections_ap.get();
618 }
619 
620 lldb::SymbolType
621 ObjectFile::GetSymbolTypeFromName(llvm::StringRef name,
622                                   lldb::SymbolType symbol_type_hint) {
623   if (!name.empty()) {
624     if (name.startswith("_OBJC_")) {
625       // ObjC
626       if (name.startswith("_OBJC_CLASS_$_"))
627         return lldb::eSymbolTypeObjCClass;
628       if (name.startswith("_OBJC_METACLASS_$_"))
629         return lldb::eSymbolTypeObjCMetaClass;
630       if (name.startswith("_OBJC_IVAR_$_"))
631         return lldb::eSymbolTypeObjCIVar;
632     } else if (name.startswith(".objc_class_name_")) {
633       // ObjC v1
634       return lldb::eSymbolTypeObjCClass;
635     }
636   }
637   return symbol_type_hint;
638 }
639 
640 ConstString ObjectFile::GetNextSyntheticSymbolName() {
641   StreamString ss;
642   ConstString file_name = GetModule()->GetFileSpec().GetFilename();
643   ss.Printf("___lldb_unnamed_symbol%u$$%s", ++m_synthetic_symbol_idx,
644             file_name.GetCString());
645   return ConstString(ss.GetString());
646 }
647 
648 std::vector<ObjectFile::LoadableData>
649 ObjectFile::GetLoadableData(Target &target) {
650   std::vector<LoadableData> loadables;
651   SectionList *section_list = GetSectionList();
652   if (!section_list)
653     return loadables;
654   // Create a list of loadable data from loadable sections
655   size_t section_count = section_list->GetNumSections(0);
656   for (size_t i = 0; i < section_count; ++i) {
657     LoadableData loadable;
658     SectionSP section_sp = section_list->GetSectionAtIndex(i);
659     loadable.Dest =
660         target.GetSectionLoadList().GetSectionLoadAddress(section_sp);
661     if (loadable.Dest == LLDB_INVALID_ADDRESS)
662       continue;
663     // We can skip sections like bss
664     if (section_sp->GetFileSize() == 0)
665       continue;
666     DataExtractor section_data;
667     section_sp->GetSectionData(section_data);
668     loadable.Contents = llvm::ArrayRef<uint8_t>(section_data.GetDataStart(),
669                                                 section_data.GetByteSize());
670     loadables.push_back(loadable);
671   }
672   return loadables;
673 }
674 
675 void ObjectFile::RelocateSection(lldb_private::Section *section)
676 {
677 }
678 
679 DataBufferSP ObjectFile::MapFileData(const FileSpec &file, uint64_t Size,
680                                      uint64_t Offset) {
681   return DataBufferLLVM::CreateSliceFromPath(file.GetPath(), Size, Offset);
682 }
683