ObjectFileMachO.cpp revision 811b9c568bb0127f09a6cdd94842586eebf25d02
1//===-- ObjectFileMachO.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 "llvm/Support/MachO.h" 11 12#include "ObjectFileMachO.h" 13 14#include "lldb/Core/ArchSpec.h" 15#include "lldb/Core/DataBuffer.h" 16#include "lldb/Host/FileSpec.h" 17#include "lldb/Core/FileSpecList.h" 18#include "lldb/Core/Module.h" 19#include "lldb/Core/PluginManager.h" 20#include "lldb/Core/Section.h" 21#include "lldb/Core/StreamFile.h" 22#include "lldb/Core/StreamString.h" 23#include "lldb/Core/Timer.h" 24#include "lldb/Core/UUID.h" 25#include "lldb/Symbol/ObjectFile.h" 26 27 28using namespace lldb; 29using namespace lldb_private; 30using namespace llvm::MachO; 31 32#define MACHO_NLIST_ARM_SYMBOL_IS_THUMB 0x0008 33 34void 35ObjectFileMachO::Initialize() 36{ 37 PluginManager::RegisterPlugin (GetPluginNameStatic(), 38 GetPluginDescriptionStatic(), 39 CreateInstance); 40} 41 42void 43ObjectFileMachO::Terminate() 44{ 45 PluginManager::UnregisterPlugin (CreateInstance); 46} 47 48 49const char * 50ObjectFileMachO::GetPluginNameStatic() 51{ 52 return "object-file.mach-o"; 53} 54 55const char * 56ObjectFileMachO::GetPluginDescriptionStatic() 57{ 58 return "Mach-o object file reader (32 and 64 bit)"; 59} 60 61 62ObjectFile * 63ObjectFileMachO::CreateInstance (Module* module, DataBufferSP& dataSP, const FileSpec* file, addr_t offset, addr_t length) 64{ 65 if (ObjectFileMachO::MagicBytesMatch(dataSP)) 66 { 67 std::auto_ptr<ObjectFile> objfile_ap(new ObjectFileMachO (module, dataSP, file, offset, length)); 68 if (objfile_ap.get() && objfile_ap->ParseHeader()) 69 return objfile_ap.release(); 70 } 71 return NULL; 72} 73 74 75static uint32_t 76MachHeaderSizeFromMagic(uint32_t magic) 77{ 78 switch (magic) 79 { 80 case HeaderMagic32: 81 case HeaderMagic32Swapped: 82 return sizeof(struct mach_header); 83 84 case HeaderMagic64: 85 case HeaderMagic64Swapped: 86 return sizeof(struct mach_header_64); 87 break; 88 89 default: 90 break; 91 } 92 return 0; 93} 94 95 96bool 97ObjectFileMachO::MagicBytesMatch (DataBufferSP& dataSP) 98{ 99 DataExtractor data(dataSP, lldb::endian::InlHostByteOrder(), 4); 100 uint32_t offset = 0; 101 uint32_t magic = data.GetU32(&offset); 102 return MachHeaderSizeFromMagic(magic) != 0; 103} 104 105 106ObjectFileMachO::ObjectFileMachO(Module* module, DataBufferSP& dataSP, const FileSpec* file, addr_t offset, addr_t length) : 107 ObjectFile(module, file, offset, length, dataSP), 108 m_mutex (Mutex::eMutexTypeRecursive), 109 m_header(), 110 m_sections_ap(), 111 m_symtab_ap(), 112 m_entry_point_address () 113{ 114 ::memset (&m_header, 0, sizeof(m_header)); 115 ::memset (&m_dysymtab, 0, sizeof(m_dysymtab)); 116} 117 118 119ObjectFileMachO::~ObjectFileMachO() 120{ 121} 122 123 124bool 125ObjectFileMachO::ParseHeader () 126{ 127 lldb_private::Mutex::Locker locker(m_mutex); 128 bool can_parse = false; 129 uint32_t offset = 0; 130 m_data.SetByteOrder (lldb::endian::InlHostByteOrder()); 131 // Leave magic in the original byte order 132 m_header.magic = m_data.GetU32(&offset); 133 switch (m_header.magic) 134 { 135 case HeaderMagic32: 136 m_data.SetByteOrder (lldb::endian::InlHostByteOrder()); 137 m_data.SetAddressByteSize(4); 138 can_parse = true; 139 break; 140 141 case HeaderMagic64: 142 m_data.SetByteOrder (lldb::endian::InlHostByteOrder()); 143 m_data.SetAddressByteSize(8); 144 can_parse = true; 145 break; 146 147 case HeaderMagic32Swapped: 148 m_data.SetByteOrder(lldb::endian::InlHostByteOrder() == eByteOrderBig ? eByteOrderLittle : eByteOrderBig); 149 m_data.SetAddressByteSize(4); 150 can_parse = true; 151 break; 152 153 case HeaderMagic64Swapped: 154 m_data.SetByteOrder(lldb::endian::InlHostByteOrder() == eByteOrderBig ? eByteOrderLittle : eByteOrderBig); 155 m_data.SetAddressByteSize(8); 156 can_parse = true; 157 break; 158 159 default: 160 break; 161 } 162 163 if (can_parse) 164 { 165 m_data.GetU32(&offset, &m_header.cputype, 6); 166 167 ArchSpec mach_arch(eArchTypeMachO, m_header.cputype, m_header.cpusubtype); 168 169 if (SetModulesArchitecture (mach_arch)) 170 { 171 // Read in all only the load command data 172 DataBufferSP data_sp(m_file.ReadFileContents(m_offset, m_header.sizeofcmds + MachHeaderSizeFromMagic(m_header.magic))); 173 m_data.SetData (data_sp); 174 return true; 175 } 176 } 177 else 178 { 179 memset(&m_header, 0, sizeof(struct mach_header)); 180 } 181 return false; 182} 183 184 185ByteOrder 186ObjectFileMachO::GetByteOrder () const 187{ 188 lldb_private::Mutex::Locker locker(m_mutex); 189 return m_data.GetByteOrder (); 190} 191 192bool 193ObjectFileMachO::IsExecutable() const 194{ 195 return m_header.filetype == HeaderFileTypeExecutable; 196} 197 198size_t 199ObjectFileMachO::GetAddressByteSize () const 200{ 201 lldb_private::Mutex::Locker locker(m_mutex); 202 return m_data.GetAddressByteSize (); 203} 204 205AddressClass 206ObjectFileMachO::GetAddressClass (lldb::addr_t file_addr) 207{ 208 Symtab *symtab = GetSymtab(); 209 if (symtab) 210 { 211 Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr); 212 if (symbol) 213 { 214 const AddressRange *range_ptr = symbol->GetAddressRangePtr(); 215 if (range_ptr) 216 { 217 const Section *section = range_ptr->GetBaseAddress().GetSection(); 218 if (section) 219 { 220 const SectionType section_type = section->GetType(); 221 switch (section_type) 222 { 223 case eSectionTypeInvalid: return eAddressClassUnknown; 224 case eSectionTypeCode: 225 if (m_header.cputype == llvm::MachO::CPUTypeARM) 226 { 227 // For ARM we have a bit in the n_desc field of the symbol 228 // that tells us ARM/Thumb which is bit 0x0008. 229 if (symbol->GetFlags() & MACHO_NLIST_ARM_SYMBOL_IS_THUMB) 230 return eAddressClassCodeAlternateISA; 231 } 232 return eAddressClassCode; 233 234 case eSectionTypeContainer: return eAddressClassUnknown; 235 case eSectionTypeData: return eAddressClassData; 236 case eSectionTypeDataCString: return eAddressClassData; 237 case eSectionTypeDataCStringPointers: return eAddressClassData; 238 case eSectionTypeDataSymbolAddress: return eAddressClassData; 239 case eSectionTypeData4: return eAddressClassData; 240 case eSectionTypeData8: return eAddressClassData; 241 case eSectionTypeData16: return eAddressClassData; 242 case eSectionTypeDataPointers: return eAddressClassData; 243 case eSectionTypeZeroFill: return eAddressClassData; 244 case eSectionTypeDataObjCMessageRefs: return eAddressClassData; 245 case eSectionTypeDataObjCCFStrings: return eAddressClassData; 246 case eSectionTypeDebug: return eAddressClassDebug; 247 case eSectionTypeDWARFDebugAbbrev: return eAddressClassDebug; 248 case eSectionTypeDWARFDebugAranges: return eAddressClassDebug; 249 case eSectionTypeDWARFDebugFrame: return eAddressClassDebug; 250 case eSectionTypeDWARFDebugInfo: return eAddressClassDebug; 251 case eSectionTypeDWARFDebugLine: return eAddressClassDebug; 252 case eSectionTypeDWARFDebugLoc: return eAddressClassDebug; 253 case eSectionTypeDWARFDebugMacInfo: return eAddressClassDebug; 254 case eSectionTypeDWARFDebugPubNames: return eAddressClassDebug; 255 case eSectionTypeDWARFDebugPubTypes: return eAddressClassDebug; 256 case eSectionTypeDWARFDebugRanges: return eAddressClassDebug; 257 case eSectionTypeDWARFDebugStr: return eAddressClassDebug; 258 case eSectionTypeEHFrame: return eAddressClassRuntime; 259 case eSectionTypeOther: return eAddressClassUnknown; 260 } 261 } 262 } 263 264 const SymbolType symbol_type = symbol->GetType(); 265 switch (symbol_type) 266 { 267 case eSymbolTypeAny: return eAddressClassUnknown; 268 case eSymbolTypeAbsolute: return eAddressClassUnknown; 269 case eSymbolTypeExtern: return eAddressClassUnknown; 270 271 case eSymbolTypeCode: 272 case eSymbolTypeTrampoline: 273 if (m_header.cputype == llvm::MachO::CPUTypeARM) 274 { 275 // For ARM we have a bit in the n_desc field of the symbol 276 // that tells us ARM/Thumb which is bit 0x0008. 277 if (symbol->GetFlags() & MACHO_NLIST_ARM_SYMBOL_IS_THUMB) 278 return eAddressClassCodeAlternateISA; 279 } 280 return eAddressClassCode; 281 282 case eSymbolTypeData: return eAddressClassData; 283 case eSymbolTypeRuntime: return eAddressClassRuntime; 284 case eSymbolTypeException: return eAddressClassRuntime; 285 case eSymbolTypeSourceFile: return eAddressClassDebug; 286 case eSymbolTypeHeaderFile: return eAddressClassDebug; 287 case eSymbolTypeObjectFile: return eAddressClassDebug; 288 case eSymbolTypeCommonBlock: return eAddressClassDebug; 289 case eSymbolTypeBlock: return eAddressClassDebug; 290 case eSymbolTypeLocal: return eAddressClassData; 291 case eSymbolTypeParam: return eAddressClassData; 292 case eSymbolTypeVariable: return eAddressClassData; 293 case eSymbolTypeVariableType: return eAddressClassDebug; 294 case eSymbolTypeLineEntry: return eAddressClassDebug; 295 case eSymbolTypeLineHeader: return eAddressClassDebug; 296 case eSymbolTypeScopeBegin: return eAddressClassDebug; 297 case eSymbolTypeScopeEnd: return eAddressClassDebug; 298 case eSymbolTypeAdditional: return eAddressClassUnknown; 299 case eSymbolTypeCompiler: return eAddressClassDebug; 300 case eSymbolTypeInstrumentation:return eAddressClassDebug; 301 case eSymbolTypeUndefined: return eAddressClassUnknown; 302 } 303 } 304 } 305 return eAddressClassUnknown; 306} 307 308Symtab * 309ObjectFileMachO::GetSymtab() 310{ 311 lldb_private::Mutex::Locker symfile_locker(m_mutex); 312 if (m_symtab_ap.get() == NULL) 313 { 314 m_symtab_ap.reset(new Symtab(this)); 315 Mutex::Locker symtab_locker (m_symtab_ap->GetMutex()); 316 ParseSymtab (true); 317 } 318 return m_symtab_ap.get(); 319} 320 321 322SectionList * 323ObjectFileMachO::GetSectionList() 324{ 325 lldb_private::Mutex::Locker locker(m_mutex); 326 if (m_sections_ap.get() == NULL) 327 { 328 m_sections_ap.reset(new SectionList()); 329 ParseSections(); 330 } 331 return m_sections_ap.get(); 332} 333 334 335size_t 336ObjectFileMachO::ParseSections () 337{ 338 lldb::user_id_t segID = 0; 339 lldb::user_id_t sectID = 0; 340 struct segment_command_64 load_cmd; 341 uint32_t offset = MachHeaderSizeFromMagic(m_header.magic); 342 uint32_t i; 343 //bool dump_sections = false; 344 for (i=0; i<m_header.ncmds; ++i) 345 { 346 const uint32_t load_cmd_offset = offset; 347 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 348 break; 349 350 if (load_cmd.cmd == LoadCommandSegment32 || load_cmd.cmd == LoadCommandSegment64) 351 { 352 if (m_data.GetU8(&offset, (uint8_t*)load_cmd.segname, 16)) 353 { 354 load_cmd.vmaddr = m_data.GetAddress(&offset); 355 load_cmd.vmsize = m_data.GetAddress(&offset); 356 load_cmd.fileoff = m_data.GetAddress(&offset); 357 load_cmd.filesize = m_data.GetAddress(&offset); 358 if (m_data.GetU32(&offset, &load_cmd.maxprot, 4)) 359 { 360 361 const bool segment_is_encrypted = (load_cmd.flags & SegmentCommandFlagBitProtectedVersion1) != 0; 362 363 // Keep a list of mach segments around in case we need to 364 // get at data that isn't stored in the abstracted Sections. 365 m_mach_segments.push_back (load_cmd); 366 367 ConstString segment_name (load_cmd.segname, std::min<int>(strlen(load_cmd.segname), sizeof(load_cmd.segname))); 368 // Use a segment ID of the segment index shifted left by 8 so they 369 // never conflict with any of the sections. 370 SectionSP segment_sp; 371 if (segment_name) 372 { 373 segment_sp.reset(new Section (NULL, 374 GetModule(), // Module to which this section belongs 375 ++segID << 8, // Section ID is the 1 based segment index shifted right by 8 bits as not to collide with any of the 256 section IDs that are possible 376 segment_name, // Name of this section 377 eSectionTypeContainer, // This section is a container of other sections. 378 load_cmd.vmaddr, // File VM address == addresses as they are found in the object file 379 load_cmd.vmsize, // VM size in bytes of this section 380 load_cmd.fileoff, // Offset to the data for this section in the file 381 load_cmd.filesize, // Size in bytes of this section as found in the the file 382 load_cmd.flags)); // Flags for this section 383 384 segment_sp->SetIsEncrypted (segment_is_encrypted); 385 m_sections_ap->AddSection(segment_sp); 386 } 387 388 struct section_64 sect64; 389 ::memset (§64, 0, sizeof(sect64)); 390 // Push a section into our mach sections for the section at 391 // index zero (NListSectionNoSection) if we don't have any 392 // mach sections yet... 393 if (m_mach_sections.empty()) 394 m_mach_sections.push_back(sect64); 395 uint32_t segment_sect_idx; 396 const lldb::user_id_t first_segment_sectID = sectID + 1; 397 398 399 const uint32_t num_u32s = load_cmd.cmd == LoadCommandSegment32 ? 7 : 8; 400 for (segment_sect_idx=0; segment_sect_idx<load_cmd.nsects; ++segment_sect_idx) 401 { 402 if (m_data.GetU8(&offset, (uint8_t*)sect64.sectname, sizeof(sect64.sectname)) == NULL) 403 break; 404 if (m_data.GetU8(&offset, (uint8_t*)sect64.segname, sizeof(sect64.segname)) == NULL) 405 break; 406 sect64.addr = m_data.GetAddress(&offset); 407 sect64.size = m_data.GetAddress(&offset); 408 409 if (m_data.GetU32(&offset, §64.offset, num_u32s) == NULL) 410 break; 411 412 // Keep a list of mach sections around in case we need to 413 // get at data that isn't stored in the abstracted Sections. 414 m_mach_sections.push_back (sect64); 415 416 ConstString section_name (sect64.sectname, std::min<size_t>(strlen(sect64.sectname), sizeof(sect64.sectname))); 417 if (!segment_name) 418 { 419 // We have a segment with no name so we need to conjure up 420 // segments that correspond to the section's segname if there 421 // isn't already such a section. If there is such a section, 422 // we resize the section so that it spans all sections. 423 // We also mark these sections as fake so address matches don't 424 // hit if they land in the gaps between the child sections. 425 segment_name.SetTrimmedCStringWithLength(sect64.segname, sizeof(sect64.segname)); 426 segment_sp = m_sections_ap->FindSectionByName (segment_name); 427 if (segment_sp.get()) 428 { 429 Section *segment = segment_sp.get(); 430 // Grow the section size as needed. 431 const lldb::addr_t sect64_min_addr = sect64.addr; 432 const lldb::addr_t sect64_max_addr = sect64_min_addr + sect64.size; 433 const lldb::addr_t curr_seg_byte_size = segment->GetByteSize(); 434 const lldb::addr_t curr_seg_min_addr = segment->GetFileAddress(); 435 const lldb::addr_t curr_seg_max_addr = curr_seg_min_addr + curr_seg_byte_size; 436 if (sect64_min_addr >= curr_seg_min_addr) 437 { 438 const lldb::addr_t new_seg_byte_size = sect64_max_addr - curr_seg_min_addr; 439 // Only grow the section size if needed 440 if (new_seg_byte_size > curr_seg_byte_size) 441 segment->SetByteSize (new_seg_byte_size); 442 } 443 else 444 { 445 // We need to change the base address of the segment and 446 // adjust the child section offsets for all existing children. 447 const lldb::addr_t slide_amount = sect64_min_addr - curr_seg_min_addr; 448 segment->Slide(slide_amount, false); 449 segment->GetChildren().Slide (-slide_amount, false); 450 segment->SetByteSize (curr_seg_max_addr - sect64_min_addr); 451 } 452 453 // Grow the section size as needed. 454 if (sect64.offset) 455 { 456 const lldb::addr_t segment_min_file_offset = segment->GetFileOffset(); 457 const lldb::addr_t segment_max_file_offset = segment_min_file_offset + segment->GetFileSize(); 458 459 const lldb::addr_t section_min_file_offset = sect64.offset; 460 const lldb::addr_t section_max_file_offset = section_min_file_offset + sect64.size; 461 const lldb::addr_t new_file_offset = std::min (section_min_file_offset, segment_min_file_offset); 462 const lldb::addr_t new_file_size = std::max (section_max_file_offset, segment_max_file_offset) - new_file_offset; 463 segment->SetFileOffset (new_file_offset); 464 segment->SetFileSize (new_file_size); 465 } 466 } 467 else 468 { 469 // Create a fake section for the section's named segment 470 segment_sp.reset(new Section(segment_sp.get(), // Parent section 471 GetModule(), // Module to which this section belongs 472 ++segID << 8, // Section ID is the 1 based segment index shifted right by 8 bits as not to collide with any of the 256 section IDs that are possible 473 segment_name, // Name of this section 474 eSectionTypeContainer, // This section is a container of other sections. 475 sect64.addr, // File VM address == addresses as they are found in the object file 476 sect64.size, // VM size in bytes of this section 477 sect64.offset, // Offset to the data for this section in the file 478 sect64.offset ? sect64.size : 0, // Size in bytes of this section as found in the the file 479 load_cmd.flags)); // Flags for this section 480 segment_sp->SetIsFake(true); 481 m_sections_ap->AddSection(segment_sp); 482 segment_sp->SetIsEncrypted (segment_is_encrypted); 483 } 484 } 485 assert (segment_sp.get()); 486 487 uint32_t mach_sect_type = sect64.flags & SectionFlagMaskSectionType; 488 static ConstString g_sect_name_objc_data ("__objc_data"); 489 static ConstString g_sect_name_objc_msgrefs ("__objc_msgrefs"); 490 static ConstString g_sect_name_objc_selrefs ("__objc_selrefs"); 491 static ConstString g_sect_name_objc_classrefs ("__objc_classrefs"); 492 static ConstString g_sect_name_objc_superrefs ("__objc_superrefs"); 493 static ConstString g_sect_name_objc_const ("__objc_const"); 494 static ConstString g_sect_name_objc_classlist ("__objc_classlist"); 495 static ConstString g_sect_name_cfstring ("__cfstring"); 496 497 static ConstString g_sect_name_dwarf_debug_abbrev ("__debug_abbrev"); 498 static ConstString g_sect_name_dwarf_debug_aranges ("__debug_aranges"); 499 static ConstString g_sect_name_dwarf_debug_frame ("__debug_frame"); 500 static ConstString g_sect_name_dwarf_debug_info ("__debug_info"); 501 static ConstString g_sect_name_dwarf_debug_line ("__debug_line"); 502 static ConstString g_sect_name_dwarf_debug_loc ("__debug_loc"); 503 static ConstString g_sect_name_dwarf_debug_macinfo ("__debug_macinfo"); 504 static ConstString g_sect_name_dwarf_debug_pubnames ("__debug_pubnames"); 505 static ConstString g_sect_name_dwarf_debug_pubtypes ("__debug_pubtypes"); 506 static ConstString g_sect_name_dwarf_debug_ranges ("__debug_ranges"); 507 static ConstString g_sect_name_dwarf_debug_str ("__debug_str"); 508 static ConstString g_sect_name_eh_frame ("__eh_frame"); 509 static ConstString g_sect_name_DATA ("__DATA"); 510 static ConstString g_sect_name_TEXT ("__TEXT"); 511 512 SectionType sect_type = eSectionTypeOther; 513 514 if (section_name == g_sect_name_dwarf_debug_abbrev) 515 sect_type = eSectionTypeDWARFDebugAbbrev; 516 else if (section_name == g_sect_name_dwarf_debug_aranges) 517 sect_type = eSectionTypeDWARFDebugAranges; 518 else if (section_name == g_sect_name_dwarf_debug_frame) 519 sect_type = eSectionTypeDWARFDebugFrame; 520 else if (section_name == g_sect_name_dwarf_debug_info) 521 sect_type = eSectionTypeDWARFDebugInfo; 522 else if (section_name == g_sect_name_dwarf_debug_line) 523 sect_type = eSectionTypeDWARFDebugLine; 524 else if (section_name == g_sect_name_dwarf_debug_loc) 525 sect_type = eSectionTypeDWARFDebugLoc; 526 else if (section_name == g_sect_name_dwarf_debug_macinfo) 527 sect_type = eSectionTypeDWARFDebugMacInfo; 528 else if (section_name == g_sect_name_dwarf_debug_pubnames) 529 sect_type = eSectionTypeDWARFDebugPubNames; 530 else if (section_name == g_sect_name_dwarf_debug_pubtypes) 531 sect_type = eSectionTypeDWARFDebugPubTypes; 532 else if (section_name == g_sect_name_dwarf_debug_ranges) 533 sect_type = eSectionTypeDWARFDebugRanges; 534 else if (section_name == g_sect_name_dwarf_debug_str) 535 sect_type = eSectionTypeDWARFDebugStr; 536 else if (section_name == g_sect_name_objc_selrefs) 537 sect_type = eSectionTypeDataCStringPointers; 538 else if (section_name == g_sect_name_objc_msgrefs) 539 sect_type = eSectionTypeDataObjCMessageRefs; 540 else if (section_name == g_sect_name_eh_frame) 541 sect_type = eSectionTypeEHFrame; 542 else if (section_name == g_sect_name_cfstring) 543 sect_type = eSectionTypeDataObjCCFStrings; 544 else if (section_name == g_sect_name_objc_data || 545 section_name == g_sect_name_objc_classrefs || 546 section_name == g_sect_name_objc_superrefs || 547 section_name == g_sect_name_objc_const || 548 section_name == g_sect_name_objc_classlist) 549 { 550 sect_type = eSectionTypeDataPointers; 551 } 552 553 if (sect_type == eSectionTypeOther) 554 { 555 switch (mach_sect_type) 556 { 557 // TODO: categorize sections by other flags for regular sections 558 case SectionTypeRegular: 559 if (segment_sp->GetName() == g_sect_name_TEXT) 560 sect_type = eSectionTypeCode; 561 else if (segment_sp->GetName() == g_sect_name_DATA) 562 sect_type = eSectionTypeData; 563 else 564 sect_type = eSectionTypeOther; 565 break; 566 case SectionTypeZeroFill: sect_type = eSectionTypeZeroFill; break; 567 case SectionTypeCStringLiterals: sect_type = eSectionTypeDataCString; break; // section with only literal C strings 568 case SectionType4ByteLiterals: sect_type = eSectionTypeData4; break; // section with only 4 byte literals 569 case SectionType8ByteLiterals: sect_type = eSectionTypeData8; break; // section with only 8 byte literals 570 case SectionTypeLiteralPointers: sect_type = eSectionTypeDataPointers; break; // section with only pointers to literals 571 case SectionTypeNonLazySymbolPointers: sect_type = eSectionTypeDataPointers; break; // section with only non-lazy symbol pointers 572 case SectionTypeLazySymbolPointers: sect_type = eSectionTypeDataPointers; break; // section with only lazy symbol pointers 573 case SectionTypeSymbolStubs: sect_type = eSectionTypeCode; break; // section with only symbol stubs, byte size of stub in the reserved2 field 574 case SectionTypeModuleInitFunctionPointers: sect_type = eSectionTypeDataPointers; break; // section with only function pointers for initialization 575 case SectionTypeModuleTermFunctionPointers: sect_type = eSectionTypeDataPointers; break; // section with only function pointers for termination 576 case SectionTypeCoalesced: sect_type = eSectionTypeOther; break; 577 case SectionTypeZeroFillLarge: sect_type = eSectionTypeZeroFill; break; 578 case SectionTypeInterposing: sect_type = eSectionTypeCode; break; // section with only pairs of function pointers for interposing 579 case SectionType16ByteLiterals: sect_type = eSectionTypeData16; break; // section with only 16 byte literals 580 case SectionTypeDTraceObjectFormat: sect_type = eSectionTypeDebug; break; 581 case SectionTypeLazyDylibSymbolPointers: sect_type = eSectionTypeDataPointers; break; 582 default: break; 583 } 584 } 585 586 SectionSP section_sp(new Section(segment_sp.get(), 587 GetModule(), 588 ++sectID, 589 section_name, 590 sect_type, 591 sect64.addr - segment_sp->GetFileAddress(), 592 sect64.size, 593 sect64.offset, 594 sect64.offset == 0 ? 0 : sect64.size, 595 sect64.flags)); 596 // Set the section to be encrypted to match the segment 597 section_sp->SetIsEncrypted (segment_is_encrypted); 598 599 segment_sp->GetChildren().AddSection(section_sp); 600 601 if (segment_sp->IsFake()) 602 { 603 segment_sp.reset(); 604 segment_name.Clear(); 605 } 606 } 607 if (segment_sp && m_header.filetype == HeaderFileTypeDSYM) 608 { 609 if (first_segment_sectID <= sectID) 610 { 611 lldb::user_id_t sect_uid; 612 for (sect_uid = first_segment_sectID; sect_uid <= sectID; ++sect_uid) 613 { 614 SectionSP curr_section_sp(segment_sp->GetChildren().FindSectionByID (sect_uid)); 615 SectionSP next_section_sp; 616 if (sect_uid + 1 <= sectID) 617 next_section_sp = segment_sp->GetChildren().FindSectionByID (sect_uid+1); 618 619 if (curr_section_sp.get()) 620 { 621 if (curr_section_sp->GetByteSize() == 0) 622 { 623 if (next_section_sp.get() != NULL) 624 curr_section_sp->SetByteSize ( next_section_sp->GetFileAddress() - curr_section_sp->GetFileAddress() ); 625 else 626 curr_section_sp->SetByteSize ( load_cmd.vmsize ); 627 } 628 } 629 } 630 } 631 } 632 } 633 } 634 } 635 else if (load_cmd.cmd == LoadCommandDynamicSymtabInfo) 636 { 637 m_dysymtab.cmd = load_cmd.cmd; 638 m_dysymtab.cmdsize = load_cmd.cmdsize; 639 m_data.GetU32 (&offset, &m_dysymtab.ilocalsym, (sizeof(m_dysymtab) / sizeof(uint32_t)) - 2); 640 } 641 642 offset = load_cmd_offset + load_cmd.cmdsize; 643 } 644// if (dump_sections) 645// { 646// StreamFile s(stdout); 647// m_sections_ap->Dump(&s, true); 648// } 649 return sectID; // Return the number of sections we registered with the module 650} 651 652class MachSymtabSectionInfo 653{ 654public: 655 656 MachSymtabSectionInfo (SectionList *section_list) : 657 m_section_list (section_list), 658 m_section_infos() 659 { 660 // Get the number of sections down to a depth of 1 to include 661 // all segments and their sections, but no other sections that 662 // may be added for debug map or 663 m_section_infos.resize(section_list->GetNumSections(1)); 664 } 665 666 667 Section * 668 GetSection (uint8_t n_sect, addr_t file_addr) 669 { 670 if (n_sect == 0) 671 return NULL; 672 if (n_sect < m_section_infos.size()) 673 { 674 if (m_section_infos[n_sect].section == NULL) 675 { 676 Section *section = m_section_list->FindSectionByID (n_sect).get(); 677 m_section_infos[n_sect].section = section; 678 if (section != NULL) 679 { 680 m_section_infos[n_sect].vm_range.SetBaseAddress (section->GetFileAddress()); 681 m_section_infos[n_sect].vm_range.SetByteSize (section->GetByteSize()); 682 } 683 else 684 { 685 fprintf (stderr, "error: unable to find section for section %u\n", n_sect); 686 } 687 } 688 if (m_section_infos[n_sect].vm_range.Contains(file_addr)) 689 { 690 // Symbol is in section. 691 return m_section_infos[n_sect].section; 692 } 693 else if (m_section_infos[n_sect].vm_range.GetByteSize () == 0 && 694 m_section_infos[n_sect].vm_range.GetBaseAddress() == file_addr) 695 { 696 // Symbol is in section with zero size, but has the same start 697 // address as the section. This can happen with linker symbols 698 // (symbols that start with the letter 'l' or 'L'. 699 return m_section_infos[n_sect].section; 700 } 701 } 702 return m_section_list->FindSectionContainingFileAddress(file_addr).get(); 703 } 704 705protected: 706 struct SectionInfo 707 { 708 SectionInfo () : 709 vm_range(), 710 section (NULL) 711 { 712 } 713 714 VMRange vm_range; 715 Section *section; 716 }; 717 SectionList *m_section_list; 718 std::vector<SectionInfo> m_section_infos; 719}; 720 721 722 723size_t 724ObjectFileMachO::ParseSymtab (bool minimize) 725{ 726 Timer scoped_timer(__PRETTY_FUNCTION__, 727 "ObjectFileMachO::ParseSymtab () module = %s", 728 m_file.GetFilename().AsCString("")); 729 struct symtab_command symtab_load_command; 730 uint32_t offset = MachHeaderSizeFromMagic(m_header.magic); 731 uint32_t i; 732 for (i=0; i<m_header.ncmds; ++i) 733 { 734 const uint32_t cmd_offset = offset; 735 // Read in the load command and load command size 736 if (m_data.GetU32(&offset, &symtab_load_command, 2) == NULL) 737 break; 738 // Watch for the symbol table load command 739 if (symtab_load_command.cmd == LoadCommandSymtab) 740 { 741 // Read in the rest of the symtab load command 742 if (m_data.GetU32(&offset, &symtab_load_command.symoff, 4)) // fill in symoff, nsyms, stroff, strsize fields 743 { 744 Symtab *symtab = m_symtab_ap.get(); 745 SectionList *section_list = GetSectionList(); 746 assert(section_list); 747 const size_t addr_size = m_data.GetAddressByteSize(); 748 const ByteOrder endian = m_data.GetByteOrder(); 749 bool bit_width_32 = addr_size == 4; 750 const size_t nlist_size = bit_width_32 ? sizeof(struct nlist) : sizeof(struct nlist_64); 751 752 DataBufferSP symtab_data_sp(m_file.ReadFileContents(m_offset + symtab_load_command.symoff, symtab_load_command.nsyms * nlist_size)); 753 DataBufferSP strtab_data_sp(m_file.ReadFileContents(m_offset + symtab_load_command.stroff, symtab_load_command.strsize)); 754 755 const char *strtab_data = (const char *)strtab_data_sp->GetBytes(); 756// DataExtractor symtab_data(symtab_data_sp, endian, addr_size); 757// DataExtractor strtab_data(strtab_data_sp, endian, addr_size); 758 759 static ConstString g_segment_name_TEXT ("__TEXT"); 760 static ConstString g_segment_name_DATA ("__DATA"); 761 static ConstString g_segment_name_OBJC ("__OBJC"); 762 static ConstString g_section_name_eh_frame ("__eh_frame"); 763 SectionSP text_section_sp(section_list->FindSectionByName(g_segment_name_TEXT)); 764 SectionSP data_section_sp(section_list->FindSectionByName(g_segment_name_DATA)); 765 SectionSP objc_section_sp(section_list->FindSectionByName(g_segment_name_OBJC)); 766 SectionSP eh_frame_section_sp; 767 if (text_section_sp.get()) 768 eh_frame_section_sp = text_section_sp->GetChildren().FindSectionByName (g_section_name_eh_frame); 769 else 770 eh_frame_section_sp = section_list->FindSectionByName (g_section_name_eh_frame); 771 772 uint8_t TEXT_eh_frame_sectID = eh_frame_section_sp.get() ? eh_frame_section_sp->GetID() : NListSectionNoSection; 773 //uint32_t symtab_offset = 0; 774 const uint8_t* nlist_data = symtab_data_sp->GetBytes(); 775 assert (symtab_data_sp->GetByteSize()/nlist_size >= symtab_load_command.nsyms); 776 777 778 if (endian != lldb::endian::InlHostByteOrder()) 779 { 780 // ... 781 assert (!"UNIMPLEMENTED: Swap all nlist entries"); 782 } 783 uint32_t N_SO_index = UINT32_MAX; 784 785 MachSymtabSectionInfo section_info (section_list); 786 std::vector<uint32_t> N_FUN_indexes; 787 std::vector<uint32_t> N_NSYM_indexes; 788 std::vector<uint32_t> N_INCL_indexes; 789 std::vector<uint32_t> N_BRAC_indexes; 790 std::vector<uint32_t> N_COMM_indexes; 791 typedef std::map <uint64_t, uint32_t> ValueToSymbolIndexMap; 792 typedef std::map <uint32_t, uint32_t> NListIndexToSymbolIndexMap; 793 ValueToSymbolIndexMap N_FUN_addr_to_sym_idx; 794 ValueToSymbolIndexMap N_STSYM_addr_to_sym_idx; 795 // Any symbols that get merged into another will get an entry 796 // in this map so we know 797 NListIndexToSymbolIndexMap m_nlist_idx_to_sym_idx; 798 uint32_t nlist_idx = 0; 799 Symbol *symbol_ptr = NULL; 800 801 uint32_t sym_idx = 0; 802 Symbol *sym = symtab->Resize (symtab_load_command.nsyms + m_dysymtab.nindirectsyms); 803 uint32_t num_syms = symtab->GetNumSymbols(); 804 805 //symtab->Reserve (symtab_load_command.nsyms + m_dysymtab.nindirectsyms); 806 for (nlist_idx = 0; nlist_idx < symtab_load_command.nsyms; ++nlist_idx) 807 { 808 struct nlist_64 nlist; 809 if (bit_width_32) 810 { 811 struct nlist* nlist32_ptr = (struct nlist*)(nlist_data + (nlist_idx * nlist_size)); 812 nlist.n_strx = nlist32_ptr->n_strx; 813 nlist.n_type = nlist32_ptr->n_type; 814 nlist.n_sect = nlist32_ptr->n_sect; 815 nlist.n_desc = nlist32_ptr->n_desc; 816 nlist.n_value = nlist32_ptr->n_value; 817 } 818 else 819 { 820 nlist = *((struct nlist_64*)(nlist_data + (nlist_idx * nlist_size))); 821 } 822 823 SymbolType type = eSymbolTypeInvalid; 824 const char* symbol_name = &strtab_data[nlist.n_strx]; 825 if (symbol_name[0] == '\0') 826 symbol_name = NULL; 827 Section* symbol_section = NULL; 828 bool add_nlist = true; 829 bool is_debug = ((nlist.n_type & NlistMaskStab) != 0); 830 831 assert (sym_idx < num_syms); 832 833 sym[sym_idx].SetDebug (is_debug); 834 835 if (is_debug) 836 { 837 switch (nlist.n_type) 838 { 839 case StabGlobalSymbol: 840 // N_GSYM -- global symbol: name,,NO_SECT,type,0 841 // Sometimes the N_GSYM value contains the address. 842 sym[sym_idx].SetExternal(true); 843 if (nlist.n_value != 0) 844 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 845 type = eSymbolTypeData; 846 break; 847 848 case StabFunctionName: 849 // N_FNAME -- procedure name (f77 kludge): name,,NO_SECT,0,0 850 type = eSymbolTypeCompiler; 851 break; 852 853 case StabFunction: 854 // N_FUN -- procedure: name,,n_sect,linenumber,address 855 if (symbol_name) 856 { 857 type = eSymbolTypeCode; 858 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 859 860 N_FUN_addr_to_sym_idx[nlist.n_value] = sym_idx; 861 // We use the current number of symbols in the symbol table in lieu of 862 // using nlist_idx in case we ever start trimming entries out 863 N_FUN_indexes.push_back(sym_idx); 864 } 865 else 866 { 867 type = eSymbolTypeCompiler; 868 869 if ( !N_FUN_indexes.empty() ) 870 { 871 // Copy the size of the function into the original STAB entry so we don't have 872 // to hunt for it later 873 symtab->SymbolAtIndex(N_FUN_indexes.back())->SetByteSize(nlist.n_value); 874 N_FUN_indexes.pop_back(); 875 // We don't really need the end function STAB as it contains the size which 876 // we already placed with the original symbol, so don't add it if we want a 877 // minimal symbol table 878 if (minimize) 879 add_nlist = false; 880 } 881 } 882 break; 883 884 case StabStaticSymbol: 885 // N_STSYM -- static symbol: name,,n_sect,type,address 886 N_STSYM_addr_to_sym_idx[nlist.n_value] = sym_idx; 887 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 888 type = eSymbolTypeData; 889 break; 890 891 case StabLocalCommon: 892 // N_LCSYM -- .lcomm symbol: name,,n_sect,type,address 893 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 894 type = eSymbolTypeCommonBlock; 895 break; 896 897 case StabBeginSymbol: 898 // N_BNSYM 899 // We use the current number of symbols in the symbol table in lieu of 900 // using nlist_idx in case we ever start trimming entries out 901 if (minimize) 902 { 903 // Skip these if we want minimal symbol tables 904 add_nlist = false; 905 } 906 else 907 { 908 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 909 N_NSYM_indexes.push_back(sym_idx); 910 type = eSymbolTypeScopeBegin; 911 } 912 break; 913 914 case StabEndSymbol: 915 // N_ENSYM 916 // Set the size of the N_BNSYM to the terminating index of this N_ENSYM 917 // so that we can always skip the entire symbol if we need to navigate 918 // more quickly at the source level when parsing STABS 919 if (minimize) 920 { 921 // Skip these if we want minimal symbol tables 922 add_nlist = false; 923 } 924 else 925 { 926 if ( !N_NSYM_indexes.empty() ) 927 { 928 symbol_ptr = symtab->SymbolAtIndex(N_NSYM_indexes.back()); 929 symbol_ptr->SetByteSize(sym_idx + 1); 930 symbol_ptr->SetSizeIsSibling(true); 931 N_NSYM_indexes.pop_back(); 932 } 933 type = eSymbolTypeScopeEnd; 934 } 935 break; 936 937 938 case StabSourceFileOptions: 939 // N_OPT - emitted with gcc2_compiled and in gcc source 940 type = eSymbolTypeCompiler; 941 break; 942 943 case StabRegisterSymbol: 944 // N_RSYM - register sym: name,,NO_SECT,type,register 945 type = eSymbolTypeVariable; 946 break; 947 948 case StabSourceLine: 949 // N_SLINE - src line: 0,,n_sect,linenumber,address 950 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 951 type = eSymbolTypeLineEntry; 952 break; 953 954 case StabStructureType: 955 // N_SSYM - structure elt: name,,NO_SECT,type,struct_offset 956 type = eSymbolTypeVariableType; 957 break; 958 959 case StabSourceFileName: 960 // N_SO - source file name 961 type = eSymbolTypeSourceFile; 962 if (symbol_name == NULL) 963 { 964 if (minimize) 965 add_nlist = false; 966 if (N_SO_index != UINT32_MAX) 967 { 968 // Set the size of the N_SO to the terminating index of this N_SO 969 // so that we can always skip the entire N_SO if we need to navigate 970 // more quickly at the source level when parsing STABS 971 symbol_ptr = symtab->SymbolAtIndex(N_SO_index); 972 symbol_ptr->SetByteSize(sym_idx + (minimize ? 0 : 1)); 973 symbol_ptr->SetSizeIsSibling(true); 974 } 975 N_NSYM_indexes.clear(); 976 N_INCL_indexes.clear(); 977 N_BRAC_indexes.clear(); 978 N_COMM_indexes.clear(); 979 N_FUN_indexes.clear(); 980 N_SO_index = UINT32_MAX; 981 } 982 else 983 { 984 // We use the current number of symbols in the symbol table in lieu of 985 // using nlist_idx in case we ever start trimming entries out 986 if (symbol_name[0] == '/') 987 N_SO_index = sym_idx; 988 else if (minimize && (N_SO_index == sym_idx - 1) && ((sym_idx - 1) < num_syms)) 989 { 990 const char *so_path = sym[sym_idx - 1].GetMangled().GetDemangledName().AsCString(); 991 if (so_path && so_path[0]) 992 { 993 std::string full_so_path (so_path); 994 if (*full_so_path.rbegin() != '/') 995 full_so_path += '/'; 996 full_so_path += symbol_name; 997 sym[sym_idx - 1].GetMangled().SetValue(full_so_path.c_str(), false); 998 add_nlist = false; 999 m_nlist_idx_to_sym_idx[nlist_idx] = sym_idx - 1; 1000 } 1001 } 1002 } 1003 1004 break; 1005 1006 case StabObjectFileName: 1007 // N_OSO - object file name: name,,0,0,st_mtime 1008 type = eSymbolTypeObjectFile; 1009 break; 1010 1011 case StabLocalSymbol: 1012 // N_LSYM - local sym: name,,NO_SECT,type,offset 1013 type = eSymbolTypeLocal; 1014 break; 1015 1016 //---------------------------------------------------------------------- 1017 // INCL scopes 1018 //---------------------------------------------------------------------- 1019 case StabBeginIncludeFileName: 1020 // N_BINCL - include file beginning: name,,NO_SECT,0,sum 1021 // We use the current number of symbols in the symbol table in lieu of 1022 // using nlist_idx in case we ever start trimming entries out 1023 N_INCL_indexes.push_back(sym_idx); 1024 type = eSymbolTypeScopeBegin; 1025 break; 1026 1027 case StabEndIncludeFile: 1028 // N_EINCL - include file end: name,,NO_SECT,0,0 1029 // Set the size of the N_BINCL to the terminating index of this N_EINCL 1030 // so that we can always skip the entire symbol if we need to navigate 1031 // more quickly at the source level when parsing STABS 1032 if ( !N_INCL_indexes.empty() ) 1033 { 1034 symbol_ptr = symtab->SymbolAtIndex(N_INCL_indexes.back()); 1035 symbol_ptr->SetByteSize(sym_idx + 1); 1036 symbol_ptr->SetSizeIsSibling(true); 1037 N_INCL_indexes.pop_back(); 1038 } 1039 type = eSymbolTypeScopeEnd; 1040 break; 1041 1042 case StabIncludeFileName: 1043 // N_SOL - #included file name: name,,n_sect,0,address 1044 type = eSymbolTypeHeaderFile; 1045 1046 // We currently don't use the header files on darwin 1047 if (minimize) 1048 add_nlist = false; 1049 break; 1050 1051 case StabCompilerParameters: 1052 // N_PARAMS - compiler parameters: name,,NO_SECT,0,0 1053 type = eSymbolTypeCompiler; 1054 break; 1055 1056 case StabCompilerVersion: 1057 // N_VERSION - compiler version: name,,NO_SECT,0,0 1058 type = eSymbolTypeCompiler; 1059 break; 1060 1061 case StabCompilerOptLevel: 1062 // N_OLEVEL - compiler -O level: name,,NO_SECT,0,0 1063 type = eSymbolTypeCompiler; 1064 break; 1065 1066 case StabParameter: 1067 // N_PSYM - parameter: name,,NO_SECT,type,offset 1068 type = eSymbolTypeVariable; 1069 break; 1070 1071 case StabAlternateEntry: 1072 // N_ENTRY - alternate entry: name,,n_sect,linenumber,address 1073 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 1074 type = eSymbolTypeLineEntry; 1075 break; 1076 1077 //---------------------------------------------------------------------- 1078 // Left and Right Braces 1079 //---------------------------------------------------------------------- 1080 case StabLeftBracket: 1081 // N_LBRAC - left bracket: 0,,NO_SECT,nesting level,address 1082 // We use the current number of symbols in the symbol table in lieu of 1083 // using nlist_idx in case we ever start trimming entries out 1084 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 1085 N_BRAC_indexes.push_back(sym_idx); 1086 type = eSymbolTypeScopeBegin; 1087 break; 1088 1089 case StabRightBracket: 1090 // N_RBRAC - right bracket: 0,,NO_SECT,nesting level,address 1091 // Set the size of the N_LBRAC to the terminating index of this N_RBRAC 1092 // so that we can always skip the entire symbol if we need to navigate 1093 // more quickly at the source level when parsing STABS 1094 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 1095 if ( !N_BRAC_indexes.empty() ) 1096 { 1097 symbol_ptr = symtab->SymbolAtIndex(N_BRAC_indexes.back()); 1098 symbol_ptr->SetByteSize(sym_idx + 1); 1099 symbol_ptr->SetSizeIsSibling(true); 1100 N_BRAC_indexes.pop_back(); 1101 } 1102 type = eSymbolTypeScopeEnd; 1103 break; 1104 1105 case StabDeletedIncludeFile: 1106 // N_EXCL - deleted include file: name,,NO_SECT,0,sum 1107 type = eSymbolTypeHeaderFile; 1108 break; 1109 1110 //---------------------------------------------------------------------- 1111 // COMM scopes 1112 //---------------------------------------------------------------------- 1113 case StabBeginCommon: 1114 // N_BCOMM - begin common: name,,NO_SECT,0,0 1115 // We use the current number of symbols in the symbol table in lieu of 1116 // using nlist_idx in case we ever start trimming entries out 1117 type = eSymbolTypeScopeBegin; 1118 N_COMM_indexes.push_back(sym_idx); 1119 break; 1120 1121 case StabEndCommonLocal: 1122 // N_ECOML - end common (local name): 0,,n_sect,0,address 1123 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 1124 // Fall through 1125 1126 case StabEndCommon: 1127 // N_ECOMM - end common: name,,n_sect,0,0 1128 // Set the size of the N_BCOMM to the terminating index of this N_ECOMM/N_ECOML 1129 // so that we can always skip the entire symbol if we need to navigate 1130 // more quickly at the source level when parsing STABS 1131 if ( !N_COMM_indexes.empty() ) 1132 { 1133 symbol_ptr = symtab->SymbolAtIndex(N_COMM_indexes.back()); 1134 symbol_ptr->SetByteSize(sym_idx + 1); 1135 symbol_ptr->SetSizeIsSibling(true); 1136 N_COMM_indexes.pop_back(); 1137 } 1138 type = eSymbolTypeScopeEnd; 1139 break; 1140 1141 case StabLength: 1142 // N_LENG - second stab entry with length information 1143 type = eSymbolTypeAdditional; 1144 break; 1145 1146 default: break; 1147 } 1148 } 1149 else 1150 { 1151 //uint8_t n_pext = NlistMaskPrivateExternal & nlist.n_type; 1152 uint8_t n_type = NlistMaskType & nlist.n_type; 1153 sym[sym_idx].SetExternal((NlistMaskExternal & nlist.n_type) != 0); 1154 1155 if (symbol_name && ::strstr (symbol_name, ".objc") == symbol_name) 1156 { 1157 type = eSymbolTypeRuntime; 1158 } 1159 else 1160 { 1161 switch (n_type) 1162 { 1163 case NListTypeIndirect: // N_INDR - Fall through 1164 case NListTypePreboundUndefined:// N_PBUD - Fall through 1165 case NListTypeUndefined: // N_UNDF 1166 type = eSymbolTypeExtern; 1167 break; 1168 1169 case NListTypeAbsolute: // N_ABS 1170 type = eSymbolTypeAbsolute; 1171 break; 1172 1173 case NListTypeSection: // N_SECT 1174 symbol_section = section_info.GetSection (nlist.n_sect, nlist.n_value); 1175 1176 if (symbol_section == NULL) 1177 { 1178 // TODO: warn about this? 1179 add_nlist = false; 1180 break; 1181 } 1182 1183 if (TEXT_eh_frame_sectID == nlist.n_sect) 1184 { 1185 type = eSymbolTypeException; 1186 } 1187 else 1188 { 1189 uint32_t section_type = symbol_section->Get() & SectionFlagMaskSectionType; 1190 1191 switch (section_type) 1192 { 1193 case SectionTypeRegular: break; // regular section 1194 //case SectionTypeZeroFill: type = eSymbolTypeData; break; // zero fill on demand section 1195 case SectionTypeCStringLiterals: type = eSymbolTypeData; break; // section with only literal C strings 1196 case SectionType4ByteLiterals: type = eSymbolTypeData; break; // section with only 4 byte literals 1197 case SectionType8ByteLiterals: type = eSymbolTypeData; break; // section with only 8 byte literals 1198 case SectionTypeLiteralPointers: type = eSymbolTypeTrampoline; break; // section with only pointers to literals 1199 case SectionTypeNonLazySymbolPointers: type = eSymbolTypeTrampoline; break; // section with only non-lazy symbol pointers 1200 case SectionTypeLazySymbolPointers: type = eSymbolTypeTrampoline; break; // section with only lazy symbol pointers 1201 case SectionTypeSymbolStubs: type = eSymbolTypeTrampoline; break; // section with only symbol stubs, byte size of stub in the reserved2 field 1202 case SectionTypeModuleInitFunctionPointers: type = eSymbolTypeCode; break; // section with only function pointers for initialization 1203 case SectionTypeModuleTermFunctionPointers: type = eSymbolTypeCode; break; // section with only function pointers for termination 1204 //case SectionTypeCoalesced: type = eSymbolType; break; // section contains symbols that are to be coalesced 1205 //case SectionTypeZeroFillLarge: type = eSymbolTypeData; break; // zero fill on demand section (that can be larger than 4 gigabytes) 1206 case SectionTypeInterposing: type = eSymbolTypeTrampoline; break; // section with only pairs of function pointers for interposing 1207 case SectionType16ByteLiterals: type = eSymbolTypeData; break; // section with only 16 byte literals 1208 case SectionTypeDTraceObjectFormat: type = eSymbolTypeInstrumentation; break; 1209 case SectionTypeLazyDylibSymbolPointers: type = eSymbolTypeTrampoline; break; 1210 default: break; 1211 } 1212 1213 if (type == eSymbolTypeInvalid) 1214 { 1215 const char *symbol_sect_name = symbol_section->GetName().AsCString(); 1216 if (symbol_section->IsDescendant (text_section_sp.get())) 1217 { 1218 if (symbol_section->IsClear(SectionAttrUserPureInstructions | 1219 SectionAttrUserSelfModifyingCode | 1220 SectionAttrSytemSomeInstructions)) 1221 type = eSymbolTypeData; 1222 else 1223 type = eSymbolTypeCode; 1224 } 1225 else 1226 if (symbol_section->IsDescendant(data_section_sp.get())) 1227 { 1228 if (symbol_sect_name && ::strstr (symbol_sect_name, "__objc") == symbol_sect_name) 1229 { 1230 type = eSymbolTypeRuntime; 1231 } 1232 else 1233 if (symbol_sect_name && ::strstr (symbol_sect_name, "__gcc_except_tab") == symbol_sect_name) 1234 { 1235 type = eSymbolTypeException; 1236 } 1237 else 1238 { 1239 type = eSymbolTypeData; 1240 } 1241 } 1242 else 1243 if (symbol_sect_name && ::strstr (symbol_sect_name, "__IMPORT") == symbol_sect_name) 1244 { 1245 type = eSymbolTypeTrampoline; 1246 } 1247 else 1248 if (symbol_section->IsDescendant(objc_section_sp.get())) 1249 { 1250 type = eSymbolTypeRuntime; 1251 } 1252 } 1253 } 1254 break; 1255 } 1256 } 1257 } 1258 if (add_nlist) 1259 { 1260 bool symbol_name_is_mangled = false; 1261 if (symbol_name && symbol_name[0] == '_') 1262 { 1263 symbol_name_is_mangled = symbol_name[1] == '_'; 1264 symbol_name++; // Skip the leading underscore 1265 } 1266 uint64_t symbol_value = nlist.n_value; 1267 1268 if (symbol_name) 1269 sym[sym_idx].GetMangled().SetValue(symbol_name, symbol_name_is_mangled); 1270 if (is_debug == false) 1271 { 1272 if (type == eSymbolTypeCode) 1273 { 1274 // See if we can find a N_FUN entry for any code symbols. 1275 // If we do find a match, and the name matches, then we 1276 // can merge the two into just the function symbol to avoid 1277 // duplicate entries in the symbol table 1278 ValueToSymbolIndexMap::const_iterator pos = N_FUN_addr_to_sym_idx.find (nlist.n_value); 1279 if (pos != N_FUN_addr_to_sym_idx.end()) 1280 { 1281 if ((symbol_name_is_mangled == true && sym[sym_idx].GetMangled().GetMangledName() == sym[pos->second].GetMangled().GetMangledName()) || 1282 (symbol_name_is_mangled == false && sym[sym_idx].GetMangled().GetDemangledName() == sym[pos->second].GetMangled().GetDemangledName())) 1283 { 1284 m_nlist_idx_to_sym_idx[nlist_idx] = pos->second; 1285 // We just need the flags from the linker symbol, so put these flags 1286 // into the N_FUN flags to avoid duplicate symbols in the symbol table 1287 sym[pos->second].SetFlags (nlist.n_type << 16 | nlist.n_desc); 1288 sym[sym_idx].Clear(); 1289 continue; 1290 } 1291 } 1292 } 1293 else if (type == eSymbolTypeData) 1294 { 1295 // See if we can find a N_STSYM entry for any data symbols. 1296 // If we do find a match, and the name matches, then we 1297 // can merge the two into just the Static symbol to avoid 1298 // duplicate entries in the symbol table 1299 ValueToSymbolIndexMap::const_iterator pos = N_STSYM_addr_to_sym_idx.find (nlist.n_value); 1300 if (pos != N_STSYM_addr_to_sym_idx.end()) 1301 { 1302 if ((symbol_name_is_mangled == true && sym[sym_idx].GetMangled().GetMangledName() == sym[pos->second].GetMangled().GetMangledName()) || 1303 (symbol_name_is_mangled == false && sym[sym_idx].GetMangled().GetDemangledName() == sym[pos->second].GetMangled().GetDemangledName())) 1304 { 1305 m_nlist_idx_to_sym_idx[nlist_idx] = pos->second; 1306 // We just need the flags from the linker symbol, so put these flags 1307 // into the N_STSYM flags to avoid duplicate symbols in the symbol table 1308 sym[pos->second].SetFlags (nlist.n_type << 16 | nlist.n_desc); 1309 sym[sym_idx].Clear(); 1310 continue; 1311 } 1312 } 1313 } 1314 } 1315 if (symbol_section != NULL) 1316 symbol_value -= symbol_section->GetFileAddress(); 1317 1318 sym[sym_idx].SetID (nlist_idx); 1319 sym[sym_idx].SetType (type); 1320 sym[sym_idx].GetAddressRangeRef().GetBaseAddress().SetSection (symbol_section); 1321 sym[sym_idx].GetAddressRangeRef().GetBaseAddress().SetOffset (symbol_value); 1322 sym[sym_idx].SetFlags (nlist.n_type << 16 | nlist.n_desc); 1323 1324 ++sym_idx; 1325 } 1326 else 1327 { 1328 sym[sym_idx].Clear(); 1329 } 1330 1331 } 1332 1333 // STAB N_GSYM entries end up having a symbol type eSymbolTypeGlobal and when the symbol value 1334 // is zero, the address of the global ends up being in a non-STAB entry. Try and fix up all 1335 // such entries by figuring out what the address for the global is by looking up this non-STAB 1336 // entry and copying the value into the debug symbol's value to save us the hassle in the 1337 // debug symbol parser. 1338 1339 Symbol *global_symbol = NULL; 1340 for (nlist_idx = 0; 1341 nlist_idx < symtab_load_command.nsyms && (global_symbol = symtab->FindSymbolWithType (eSymbolTypeData, Symtab::eDebugYes, Symtab::eVisibilityAny, nlist_idx)) != NULL; 1342 nlist_idx++) 1343 { 1344 if (global_symbol->GetValue().GetFileAddress() == 0) 1345 { 1346 std::vector<uint32_t> indexes; 1347 if (symtab->AppendSymbolIndexesWithName (global_symbol->GetMangled().GetName(), indexes) > 0) 1348 { 1349 std::vector<uint32_t>::const_iterator pos; 1350 std::vector<uint32_t>::const_iterator end = indexes.end(); 1351 for (pos = indexes.begin(); pos != end; ++pos) 1352 { 1353 symbol_ptr = symtab->SymbolAtIndex(*pos); 1354 if (symbol_ptr != global_symbol && symbol_ptr->IsDebug() == false) 1355 { 1356 global_symbol->SetValue(symbol_ptr->GetValue()); 1357 break; 1358 } 1359 } 1360 } 1361 } 1362 } 1363 1364 // Trim our symbols down to just what we ended up with after 1365 // removing any symbols. 1366 if (sym_idx < num_syms) 1367 { 1368 num_syms = sym_idx; 1369 sym = symtab->Resize (num_syms); 1370 } 1371 1372 // Now synthesize indirect symbols 1373 if (m_dysymtab.nindirectsyms != 0) 1374 { 1375 DataBufferSP indirect_symbol_indexes_sp(m_file.ReadFileContents(m_offset + m_dysymtab.indirectsymoff, m_dysymtab.nindirectsyms * 4)); 1376 1377 if (indirect_symbol_indexes_sp && indirect_symbol_indexes_sp->GetByteSize()) 1378 { 1379 NListIndexToSymbolIndexMap::const_iterator end_index_pos = m_nlist_idx_to_sym_idx.end(); 1380 DataExtractor indirect_symbol_index_data (indirect_symbol_indexes_sp, m_data.GetByteOrder(), m_data.GetAddressByteSize()); 1381 1382 for (uint32_t sect_idx = 1; sect_idx < m_mach_sections.size(); ++sect_idx) 1383 { 1384 if ((m_mach_sections[sect_idx].flags & SectionFlagMaskSectionType) == SectionTypeSymbolStubs) 1385 { 1386 uint32_t symbol_stub_byte_size = m_mach_sections[sect_idx].reserved2; 1387 if (symbol_stub_byte_size == 0) 1388 continue; 1389 1390 const uint32_t num_symbol_stubs = m_mach_sections[sect_idx].size / symbol_stub_byte_size; 1391 1392 if (num_symbol_stubs == 0) 1393 continue; 1394 1395 const uint32_t symbol_stub_index_offset = m_mach_sections[sect_idx].reserved1; 1396 uint32_t synthetic_stub_sym_id = symtab_load_command.nsyms; 1397 for (uint32_t stub_idx = 0; stub_idx < num_symbol_stubs; ++stub_idx) 1398 { 1399 const uint32_t symbol_stub_index = symbol_stub_index_offset + stub_idx; 1400 const lldb::addr_t symbol_stub_addr = m_mach_sections[sect_idx].addr + (stub_idx * symbol_stub_byte_size); 1401 uint32_t symbol_stub_offset = symbol_stub_index * 4; 1402 if (indirect_symbol_index_data.ValidOffsetForDataOfSize(symbol_stub_offset, 4)) 1403 { 1404 const uint32_t stub_sym_id = indirect_symbol_index_data.GetU32 (&symbol_stub_offset); 1405 if (stub_sym_id & (IndirectSymbolAbsolute | IndirectSymbolLocal)) 1406 continue; 1407 1408 NListIndexToSymbolIndexMap::const_iterator index_pos = m_nlist_idx_to_sym_idx.find (stub_sym_id); 1409 Symbol *stub_symbol = NULL; 1410 if (index_pos != end_index_pos) 1411 { 1412 // We have a remapping from the original nlist index to 1413 // a current symbol index, so just look this up by index 1414 stub_symbol = symtab->SymbolAtIndex (index_pos->second); 1415 } 1416 else 1417 { 1418 // We need to lookup a symbol using the original nlist 1419 // symbol index since this index is coming from the 1420 // S_SYMBOL_STUBS 1421 stub_symbol = symtab->FindSymbolByID (stub_sym_id); 1422 } 1423 1424 assert (stub_symbol); 1425 if (stub_symbol) 1426 { 1427 Address so_addr(symbol_stub_addr, section_list); 1428 1429 if (stub_symbol->GetType() == eSymbolTypeExtern) 1430 { 1431 // Change the external symbol into a trampoline that makes sense 1432 // These symbols were N_UNDF N_EXT, and are useless to us, so we 1433 // can re-use them so we don't have to make up a synthetic symbol 1434 // for no good reason. 1435 stub_symbol->SetType (eSymbolTypeTrampoline); 1436 stub_symbol->SetExternal (false); 1437 stub_symbol->GetAddressRangeRef().GetBaseAddress() = so_addr; 1438 stub_symbol->GetAddressRangeRef().SetByteSize (symbol_stub_byte_size); 1439 } 1440 else 1441 { 1442 // Make a synthetic symbol to describe the trampoline stub 1443 if (sym_idx >= num_syms) 1444 sym = symtab->Resize (++num_syms); 1445 sym[sym_idx].SetID (synthetic_stub_sym_id++); 1446 sym[sym_idx].GetMangled() = stub_symbol->GetMangled(); 1447 sym[sym_idx].SetType (eSymbolTypeTrampoline); 1448 sym[sym_idx].SetIsSynthetic (true); 1449 sym[sym_idx].GetAddressRangeRef().GetBaseAddress() = so_addr; 1450 sym[sym_idx].GetAddressRangeRef().SetByteSize (symbol_stub_byte_size); 1451 ++sym_idx; 1452 } 1453 } 1454 } 1455 } 1456 } 1457 } 1458 } 1459 } 1460 1461 return symtab->GetNumSymbols(); 1462 } 1463 } 1464 offset = cmd_offset + symtab_load_command.cmdsize; 1465 } 1466 return 0; 1467} 1468 1469 1470void 1471ObjectFileMachO::Dump (Stream *s) 1472{ 1473 lldb_private::Mutex::Locker locker(m_mutex); 1474 s->Printf("%.*p: ", (int)sizeof(void*) * 2, this); 1475 s->Indent(); 1476 if (m_header.magic == HeaderMagic64 || m_header.magic == HeaderMagic64Swapped) 1477 s->PutCString("ObjectFileMachO64"); 1478 else 1479 s->PutCString("ObjectFileMachO32"); 1480 1481 ArchSpec header_arch(eArchTypeMachO, m_header.cputype, m_header.cpusubtype); 1482 1483 *s << ", file = '" << m_file << "', arch = " << header_arch.GetArchitectureName() << "\n"; 1484 1485 if (m_sections_ap.get()) 1486 m_sections_ap->Dump(s, NULL, true, UINT32_MAX); 1487 1488 if (m_symtab_ap.get()) 1489 m_symtab_ap->Dump(s, NULL, eSortOrderNone); 1490} 1491 1492 1493bool 1494ObjectFileMachO::GetUUID (lldb_private::UUID* uuid) 1495{ 1496 lldb_private::Mutex::Locker locker(m_mutex); 1497 struct uuid_command load_cmd; 1498 uint32_t offset = MachHeaderSizeFromMagic(m_header.magic); 1499 uint32_t i; 1500 for (i=0; i<m_header.ncmds; ++i) 1501 { 1502 const uint32_t cmd_offset = offset; 1503 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 1504 break; 1505 1506 if (load_cmd.cmd == LoadCommandUUID) 1507 { 1508 const uint8_t *uuid_bytes = m_data.PeekData(offset, 16); 1509 if (uuid_bytes) 1510 { 1511 uuid->SetBytes (uuid_bytes); 1512 return true; 1513 } 1514 return false; 1515 } 1516 offset = cmd_offset + load_cmd.cmdsize; 1517 } 1518 return false; 1519} 1520 1521 1522uint32_t 1523ObjectFileMachO::GetDependentModules (FileSpecList& files) 1524{ 1525 lldb_private::Mutex::Locker locker(m_mutex); 1526 struct load_command load_cmd; 1527 uint32_t offset = MachHeaderSizeFromMagic(m_header.magic); 1528 uint32_t count = 0; 1529 const bool resolve_path = false; // Don't resolve the dependend file paths since they may not reside on this system 1530 uint32_t i; 1531 for (i=0; i<m_header.ncmds; ++i) 1532 { 1533 const uint32_t cmd_offset = offset; 1534 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 1535 break; 1536 1537 switch (load_cmd.cmd) 1538 { 1539 case LoadCommandDylibLoad: 1540 case LoadCommandDylibLoadWeak: 1541 case LoadCommandDylibReexport: 1542 case LoadCommandDynamicLinkerLoad: 1543 case LoadCommandFixedVMShlibLoad: 1544 case LoadCommandDylibLoadUpward: 1545 { 1546 uint32_t name_offset = cmd_offset + m_data.GetU32(&offset); 1547 const char *path = m_data.PeekCStr(name_offset); 1548 // Skip any path that starts with '@' since these are usually: 1549 // @executable_path/.../file 1550 // @rpath/.../file 1551 if (path && path[0] != '@') 1552 { 1553 FileSpec file_spec(path, resolve_path); 1554 if (files.AppendIfUnique(file_spec)) 1555 count++; 1556 } 1557 } 1558 break; 1559 1560 default: 1561 break; 1562 } 1563 offset = cmd_offset + load_cmd.cmdsize; 1564 } 1565 return count; 1566} 1567 1568lldb_private::Address 1569ObjectFileMachO::GetEntryPointAddress () 1570{ 1571 // If the object file is not an executable it can't hold the entry point. m_entry_point_address 1572 // is initialized to an invalid address, so we can just return that. 1573 // If m_entry_point_address is valid it means we've found it already, so return the cached value. 1574 1575 if (!IsExecutable() || m_entry_point_address.IsValid()) 1576 return m_entry_point_address; 1577 1578 // Otherwise, look for the UnixThread or Thread command. The data for the Thread command is given in 1579 // /usr/include/mach-o.h, but it is basically: 1580 // 1581 // uint32_t flavor - this is the flavor argument you would pass to thread_get_state 1582 // uint32_t count - this is the count of longs in the thread state data 1583 // struct XXX_thread_state state - this is the structure from <machine/thread_status.h> corresponding to the flavor. 1584 // <repeat this trio> 1585 // 1586 // So we just keep reading the various register flavors till we find the GPR one, then read the PC out of there. 1587 // FIXME: We will need to have a "RegisterContext data provider" class at some point that can get all the registers 1588 // out of data in this form & attach them to a given thread. That should underlie the MacOS X User process plugin, 1589 // and we'll also need it for the MacOS X Core File process plugin. When we have that we can also use it here. 1590 // 1591 // For now we hard-code the offsets and flavors we need: 1592 // 1593 // 1594 1595 lldb_private::Mutex::Locker locker(m_mutex); 1596 struct load_command load_cmd; 1597 uint32_t offset = MachHeaderSizeFromMagic(m_header.magic); 1598 uint32_t i; 1599 lldb::addr_t start_address = LLDB_INVALID_ADDRESS; 1600 bool done = false; 1601 1602 for (i=0; i<m_header.ncmds; ++i) 1603 { 1604 const uint32_t cmd_offset = offset; 1605 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 1606 break; 1607 1608 switch (load_cmd.cmd) 1609 { 1610 case LoadCommandUnixThread: 1611 case LoadCommandThread: 1612 { 1613 while (offset < cmd_offset + load_cmd.cmdsize) 1614 { 1615 uint32_t flavor = m_data.GetU32(&offset); 1616 uint32_t count = m_data.GetU32(&offset); 1617 if (count == 0) 1618 { 1619 // We've gotten off somehow, log and exit; 1620 return m_entry_point_address; 1621 } 1622 1623 switch (m_header.cputype) 1624 { 1625 case llvm::MachO::CPUTypeARM: 1626 if (flavor == 1) // ARM_THREAD_STATE from mach/arm/thread_status.h 1627 { 1628 offset += 60; // This is the offset of pc in the GPR thread state data structure. 1629 start_address = m_data.GetU32(&offset); 1630 done = true; 1631 } 1632 break; 1633 case llvm::MachO::CPUTypeI386: 1634 if (flavor == 1) // x86_THREAD_STATE32 from mach/i386/thread_status.h 1635 { 1636 offset += 40; // This is the offset of eip in the GPR thread state data structure. 1637 start_address = m_data.GetU32(&offset); 1638 done = true; 1639 } 1640 break; 1641 case llvm::MachO::CPUTypeX86_64: 1642 if (flavor == 4) // x86_THREAD_STATE64 from mach/i386/thread_status.h 1643 { 1644 offset += 16 * 8; // This is the offset of rip in the GPR thread state data structure. 1645 start_address = m_data.GetU64(&offset); 1646 done = true; 1647 } 1648 break; 1649 default: 1650 return m_entry_point_address; 1651 } 1652 // Haven't found the GPR flavor yet, skip over the data for this flavor: 1653 if (done) 1654 break; 1655 offset += count * 4; 1656 } 1657 } 1658 break; 1659 1660 default: 1661 break; 1662 } 1663 if (done) 1664 break; 1665 1666 // Go to the next load command: 1667 offset = cmd_offset + load_cmd.cmdsize; 1668 } 1669 1670 if (start_address != LLDB_INVALID_ADDRESS) 1671 { 1672 // We got the start address from the load commands, so now resolve that address in the sections 1673 // of this ObjectFile: 1674 if (!m_entry_point_address.ResolveAddressUsingFileSections (start_address, GetSectionList())) 1675 { 1676 m_entry_point_address.Clear(); 1677 } 1678 } 1679 else 1680 { 1681 // We couldn't read the UnixThread load command - maybe it wasn't there. As a fallback look for the 1682 // "start" symbol in the main executable. 1683 1684 SymbolContextList contexts; 1685 SymbolContext context; 1686 if (!m_module->FindSymbolsWithNameAndType(ConstString ("start"), eSymbolTypeCode, contexts)) 1687 return m_entry_point_address; 1688 1689 contexts.GetContextAtIndex(0, context); 1690 1691 m_entry_point_address = context.symbol->GetValue(); 1692 } 1693 1694 return m_entry_point_address; 1695 1696} 1697 1698ObjectFile::Type 1699ObjectFileMachO::CalculateType() 1700{ 1701 switch (m_header.filetype) 1702 { 1703 case HeaderFileTypeObject: // 0x1u MH_OBJECT 1704 if (GetAddressByteSize () == 4) 1705 { 1706 // 32 bit kexts are just object files, but they do have a valid 1707 // UUID load command. 1708 UUID uuid; 1709 if (GetUUID(&uuid)) 1710 { 1711 // this checking for the UUID load command is not enough 1712 // we could eventually look for the symbol named 1713 // "OSKextGetCurrentIdentifier" as this is required of kexts 1714 if (m_strata == eStrataInvalid) 1715 m_strata = eStrataKernel; 1716 return eTypeSharedLibrary; 1717 } 1718 } 1719 return eTypeObjectFile; 1720 1721 case HeaderFileTypeExecutable: return eTypeExecutable; // 0x2u MH_EXECUTE 1722 case HeaderFileTypeFixedVMShlib: return eTypeSharedLibrary; // 0x3u MH_FVMLIB 1723 case HeaderFileTypeCore: return eTypeCoreFile; // 0x4u MH_CORE 1724 case HeaderFileTypePreloadedExecutable: return eTypeSharedLibrary; // 0x5u MH_PRELOAD 1725 case HeaderFileTypeDynamicShlib: return eTypeSharedLibrary; // 0x6u MH_DYLIB 1726 case HeaderFileTypeDynamicLinkEditor: return eTypeDynamicLinker; // 0x7u MH_DYLINKER 1727 case HeaderFileTypeBundle: return eTypeSharedLibrary; // 0x8u MH_BUNDLE 1728 case HeaderFileTypeDynamicShlibStub: return eTypeStubLibrary; // 0x9u MH_DYLIB_STUB 1729 case HeaderFileTypeDSYM: return eTypeDebugInfo; // 0xAu MH_DSYM 1730 case HeaderFileTypeKextBundle: return eTypeSharedLibrary; // 0xBu MH_KEXT_BUNDLE 1731 default: 1732 break; 1733 } 1734 return eTypeUnknown; 1735} 1736 1737ObjectFile::Strata 1738ObjectFileMachO::CalculateStrata() 1739{ 1740 switch (m_header.filetype) 1741 { 1742 case HeaderFileTypeObject: // 0x1u MH_OBJECT 1743 { 1744 // 32 bit kexts are just object files, but they do have a valid 1745 // UUID load command. 1746 UUID uuid; 1747 if (GetUUID(&uuid)) 1748 { 1749 // this checking for the UUID load command is not enough 1750 // we could eventually look for the symbol named 1751 // "OSKextGetCurrentIdentifier" as this is required of kexts 1752 if (m_type == eTypeInvalid) 1753 m_type = eTypeSharedLibrary; 1754 1755 return eStrataKernel; 1756 } 1757 } 1758 return eStrataUnknown; 1759 1760 case HeaderFileTypeExecutable: // 0x2u MH_EXECUTE 1761 // Check for the MH_DYLDLINK bit in the flags 1762 if (m_header.flags & HeaderFlagBitIsDynamicLinkObject) 1763 return eStrataUser; 1764 return eStrataKernel; 1765 1766 case HeaderFileTypeFixedVMShlib: return eStrataUser; // 0x3u MH_FVMLIB 1767 case HeaderFileTypeCore: return eStrataUnknown; // 0x4u MH_CORE 1768 case HeaderFileTypePreloadedExecutable: return eStrataUser; // 0x5u MH_PRELOAD 1769 case HeaderFileTypeDynamicShlib: return eStrataUser; // 0x6u MH_DYLIB 1770 case HeaderFileTypeDynamicLinkEditor: return eStrataUser; // 0x7u MH_DYLINKER 1771 case HeaderFileTypeBundle: return eStrataUser; // 0x8u MH_BUNDLE 1772 case HeaderFileTypeDynamicShlibStub: return eStrataUser; // 0x9u MH_DYLIB_STUB 1773 case HeaderFileTypeDSYM: return eStrataUnknown; // 0xAu MH_DSYM 1774 case HeaderFileTypeKextBundle: return eStrataKernel; // 0xBu MH_KEXT_BUNDLE 1775 default: 1776 break; 1777 } 1778 return eStrataUnknown; 1779} 1780 1781 1782bool 1783ObjectFileMachO::GetArchitecture (ArchSpec &arch) 1784{ 1785 lldb_private::Mutex::Locker locker(m_mutex); 1786 arch.SetArchitecture (eArchTypeMachO, m_header.cputype, m_header.cpusubtype); 1787 return true; 1788} 1789 1790 1791//------------------------------------------------------------------ 1792// PluginInterface protocol 1793//------------------------------------------------------------------ 1794const char * 1795ObjectFileMachO::GetPluginName() 1796{ 1797 return "ObjectFileMachO"; 1798} 1799 1800const char * 1801ObjectFileMachO::GetShortPluginName() 1802{ 1803 return GetPluginNameStatic(); 1804} 1805 1806uint32_t 1807ObjectFileMachO::GetPluginVersion() 1808{ 1809 return 1; 1810} 1811 1812