contrib/llvm/tools/lldb/source/Core/Address.cpp

   1 //===-- Address.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/Core/Address.h"
  11 #include "lldb/Core/DumpDataExtractor.h"
  12 #include "lldb/Core/Module.h"
  13 #include "lldb/Core/ModuleList.h" // for ModuleList
  14 #include "lldb/Core/Section.h"
  15 #include "lldb/Symbol/Block.h"
  16 #include "lldb/Symbol/Declaration.h" // for Declaration
  17 #include "lldb/Symbol/LineEntry.h"   // for LineEntry
  18 #include "lldb/Symbol/ObjectFile.h"
  19 #include "lldb/Symbol/Symbol.h"        // for Symbol
  20 #include "lldb/Symbol/SymbolContext.h" // for SymbolContext
  21 #include "lldb/Symbol/SymbolVendor.h"
  22 #include "lldb/Symbol/Symtab.h" // for Symtab
  23 #include "lldb/Symbol/Type.h"   // for Type
  24 #include "lldb/Symbol/Variable.h"
  25 #include "lldb/Symbol/VariableList.h"
  26 #include "lldb/Target/ExecutionContext.h"
  27 #include "lldb/Target/ExecutionContextScope.h" // for ExecutionContextScope
  28 #include "lldb/Target/Process.h"
  29 #include "lldb/Target/SectionLoadList.h"
  30 #include "lldb/Target/Target.h"
  31 #include "lldb/Utility/ConstString.h"   // for ConstString
  32 #include "lldb/Utility/DataExtractor.h" // for DataExtractor
  33 #include "lldb/Utility/Endian.h"        // for InlHostByteOrder
  34 #include "lldb/Utility/FileSpec.h"      // for FileSpec
  35 #include "lldb/Utility/Status.h"        // for Status
  36 #include "lldb/Utility/Stream.h"        // for Stream
  37 #include "lldb/Utility/StreamString.h"  // for StreamString
  38
  39 #include "llvm/ADT/StringRef.h" // for StringRef
  40 #include "llvm/ADT/Triple.h"
  41 #include "llvm/Support/Compiler.h" // for LLVM_FALLTHROUGH
  42
  43 #include <cstdint> // for uint8_t, uint32_t
  44 #include <memory>  // for shared_ptr, operator!=
  45 #include <vector>  // for vector
  46
  47 #include <assert.h>   // for assert
  48 #include <inttypes.h> // for PRIu64, PRIx64
  49 #include <string.h>   // for size_t, strlen
  50
  51 namespace lldb_private {
  52 class CompileUnit;
  53 }
  54 namespace lldb_private {
  55 class Function;
  56 }
  57
  58 using namespace lldb;
  59 using namespace lldb_private;
  60
  61 static size_t ReadBytes(ExecutionContextScope *exe_scope,
  62                         const Address &address, void *dst, size_t dst_len) {
  63   if (exe_scope == nullptr)
  64     return 0;
  65
  66   TargetSP target_sp(exe_scope->CalculateTarget());
  67   if (target_sp) {
  68     Status error;
  69     bool prefer_file_cache = false;
  70     return target_sp->ReadMemory(address, prefer_file_cache, dst, dst_len,
  71                                  error);
  72   }
  73   return 0;
  74 }
  75
  76 static bool GetByteOrderAndAddressSize(ExecutionContextScope *exe_scope,
  77                                        const Address &address,
  78                                        ByteOrder &byte_order,
  79                                        uint32_t &addr_size) {
  80   byte_order = eByteOrderInvalid;
  81   addr_size = 0;
  82   if (exe_scope == nullptr)
  83     return false;
  84
  85   TargetSP target_sp(exe_scope->CalculateTarget());
  86   if (target_sp) {
  87     byte_order = target_sp->GetArchitecture().GetByteOrder();
  88     addr_size = target_sp->GetArchitecture().GetAddressByteSize();
  89   }
  90
  91   if (byte_order == eByteOrderInvalid || addr_size == 0) {
  92     ModuleSP module_sp(address.GetModule());
  93     if (module_sp) {
  94       byte_order = module_sp->GetArchitecture().GetByteOrder();
  95       addr_size = module_sp->GetArchitecture().GetAddressByteSize();
  96     }
  97   }
  98   return byte_order != eByteOrderInvalid && addr_size != 0;
  99 }
 100
 101 static uint64_t ReadUIntMax64(ExecutionContextScope *exe_scope,
 102                               const Address &address, uint32_t byte_size,
 103                               bool &success) {
 104   uint64_t uval64 = 0;
 105   if (exe_scope == nullptr || byte_size > sizeof(uint64_t)) {
 106     success = false;
 107     return 0;
 108   }
 109   uint64_t buf = 0;
 110
 111   success = ReadBytes(exe_scope, address, &buf, byte_size) == byte_size;
 112   if (success) {
 113     ByteOrder byte_order = eByteOrderInvalid;
 114     uint32_t addr_size = 0;
 115     if (GetByteOrderAndAddressSize(exe_scope, address, byte_order, addr_size)) {
 116       DataExtractor data(&buf, sizeof(buf), byte_order, addr_size);
 117       lldb::offset_t offset = 0;
 118       uval64 = data.GetU64(&offset);
 119     } else
 120       success = false;
 121   }
 122   return uval64;
 123 }
 124
 125 static bool ReadAddress(ExecutionContextScope *exe_scope,
 126                         const Address &address, uint32_t pointer_size,
 127                         Address &deref_so_addr) {
 128   if (exe_scope == nullptr)
 129     return false;
 130
 131   bool success = false;
 132   addr_t deref_addr = ReadUIntMax64(exe_scope, address, pointer_size, success);
 133   if (success) {
 134     ExecutionContext exe_ctx;
 135     exe_scope->CalculateExecutionContext(exe_ctx);
 136     // If we have any sections that are loaded, try and resolve using the
 137     // section load list
 138     Target *target = exe_ctx.GetTargetPtr();
 139     if (target && !target->GetSectionLoadList().IsEmpty()) {
 140       if (target->GetSectionLoadList().ResolveLoadAddress(deref_addr,
 141                                                           deref_so_addr))
 142         return true;
 143     } else {
 144       // If we were not running, yet able to read an integer, we must have a
 145       // module
 146       ModuleSP module_sp(address.GetModule());
 147
 148       assert(module_sp);
 149       if (module_sp->ResolveFileAddress(deref_addr, deref_so_addr))
 150         return true;
 151     }
 152
 153     // We couldn't make "deref_addr" into a section offset value, but we were
 154     // able to read the address, so we return a section offset address with no
 155     // section and "deref_addr" as the offset (address).
 156     deref_so_addr.SetRawAddress(deref_addr);
 157     return true;
 158   }
 159   return false;
 160 }
 161
 162 static bool DumpUInt(ExecutionContextScope *exe_scope, const Address &address,
 163                      uint32_t byte_size, Stream *strm) {
 164   if (exe_scope == nullptr || byte_size == 0)
 165     return 0;
 166   std::vector<uint8_t> buf(byte_size, 0);
 167
 168   if (ReadBytes(exe_scope, address, &buf[0], buf.size()) == buf.size()) {
 169     ByteOrder byte_order = eByteOrderInvalid;
 170     uint32_t addr_size = 0;
 171     if (GetByteOrderAndAddressSize(exe_scope, address, byte_order, addr_size)) {
 172       DataExtractor data(&buf.front(), buf.size(), byte_order, addr_size);
 173
 174       DumpDataExtractor(data, strm,
 175                         0,                    // Start offset in "data"
 176                         eFormatHex,           // Print as characters
 177                         buf.size(),           // Size of item
 178                         1,                    // Items count
 179                         UINT32_MAX,           // num per line
 180                         LLDB_INVALID_ADDRESS, // base address
 181                         0,                    // bitfield bit size
 182                         0);                   // bitfield bit offset
 183
 184       return true;
 185     }
 186   }
 187   return false;
 188 }
 189
 190 static size_t ReadCStringFromMemory(ExecutionContextScope *exe_scope,
 191                                     const Address &address, Stream *strm) {
 192   if (exe_scope == nullptr)
 193     return 0;
 194   const size_t k_buf_len = 256;
 195   char buf[k_buf_len + 1];
 196   buf[k_buf_len] = '\0'; // NULL terminate
 197
 198   // Byte order and address size don't matter for C string dumping..
 199   DataExtractor data(buf, sizeof(buf), endian::InlHostByteOrder(), 4);
 200   size_t total_len = 0;
 201   size_t bytes_read;
 202   Address curr_address(address);
 203   strm->PutChar('"');
 204   while ((bytes_read = ReadBytes(exe_scope, curr_address, buf, k_buf_len)) >
 205          0) {
 206     size_t len = strlen(buf);
 207     if (len == 0)
 208       break;
 209     if (len > bytes_read)
 210       len = bytes_read;
 211
 212     DumpDataExtractor(data, strm,
 213                       0,                    // Start offset in "data"
 214                       eFormatChar,          // Print as characters
 215                       1,                    // Size of item (1 byte for a char!)
 216                       len,                  // How many bytes to print?
 217                       UINT32_MAX,           // num per line
 218                       LLDB_INVALID_ADDRESS, // base address
 219                       0,                    // bitfield bit size
 220
 221                       0); // bitfield bit offset
 222
 223     total_len += bytes_read;
 224
 225     if (len < k_buf_len)
 226       break;
 227     curr_address.SetOffset(curr_address.GetOffset() + bytes_read);
 228   }
 229   strm->PutChar('"');
 230   return total_len;
 231 }
 232
 233 Address::Address(lldb::addr_t abs_addr) : m_section_wp(), m_offset(abs_addr) {}
 234
 235 Address::Address(addr_t address, const SectionList *section_list)
 236     : m_section_wp(), m_offset(LLDB_INVALID_ADDRESS) {
 237   ResolveAddressUsingFileSections(address, section_list);
 238 }
 239
 240 const Address &Address::operator=(const Address &rhs) {
 241   if (this != &rhs) {
 242     m_section_wp = rhs.m_section_wp;
 243     m_offset = rhs.m_offset;
 244   }
 245   return *this;
 246 }
 247
 248 bool Address::ResolveAddressUsingFileSections(addr_t file_addr,
 249                                               const SectionList *section_list) {
 250   if (section_list) {
 251     SectionSP section_sp(
 252         section_list->FindSectionContainingFileAddress(file_addr));
 253     m_section_wp = section_sp;
 254     if (section_sp) {
 255       assert(section_sp->ContainsFileAddress(file_addr));
 256       m_offset = file_addr - section_sp->GetFileAddress();
 257       return true; // Successfully transformed addr into a section offset
 258                    // address
 259     }
 260   }
 261   m_offset = file_addr;
 262   return false; // Failed to resolve this address to a section offset value
 263 }
 264
 265 ModuleSP Address::GetModule() const {
 266   lldb::ModuleSP module_sp;
 267   SectionSP section_sp(GetSection());
 268   if (section_sp)
 269     module_sp = section_sp->GetModule();
 270   return module_sp;
 271 }
 272
 273 addr_t Address::GetFileAddress() const {
 274   SectionSP section_sp(GetSection());
 275   if (section_sp) {
 276     addr_t sect_file_addr = section_sp->GetFileAddress();
 277     if (sect_file_addr == LLDB_INVALID_ADDRESS) {
 278       // Section isn't resolved, we can't return a valid file address
 279       return LLDB_INVALID_ADDRESS;
 280     }
 281     // We have a valid file range, so we can return the file based address by
 282     // adding the file base address to our offset
 283     return sect_file_addr + m_offset;
 284   } else if (SectionWasDeletedPrivate()) {
 285     // Used to have a valid section but it got deleted so the offset doesn't
 286     // mean anything without the section
 287     return LLDB_INVALID_ADDRESS;
 288   }
 289   // No section, we just return the offset since it is the value in this case
 290   return m_offset;
 291 }
 292
 293 addr_t Address::GetLoadAddress(Target *target) const {
 294   SectionSP section_sp(GetSection());
 295   if (section_sp) {
 296     if (target) {
 297       addr_t sect_load_addr = section_sp->GetLoadBaseAddress(target);
 298
 299       if (sect_load_addr != LLDB_INVALID_ADDRESS) {
 300         // We have a valid file range, so we can return the file based address
 301         // by adding the file base address to our offset
 302         return sect_load_addr + m_offset;
 303       }
 304     }
 305   } else if (SectionWasDeletedPrivate()) {
 306     // Used to have a valid section but it got deleted so the offset doesn't
 307     // mean anything without the section
 308     return LLDB_INVALID_ADDRESS;
 309   } else {
 310     // We don't have a section so the offset is the load address
 311     return m_offset;
 312   }
 313   // The section isn't resolved or an invalid target was passed in so we can't
 314   // return a valid load address.
 315   return LLDB_INVALID_ADDRESS;
 316 }
 317
 318 addr_t Address::GetCallableLoadAddress(Target *target, bool is_indirect) const {
 319   addr_t code_addr = LLDB_INVALID_ADDRESS;
 320
 321   if (is_indirect && target) {
 322     ProcessSP processSP = target->GetProcessSP();
 323     Status error;
 324     if (processSP) {
 325       code_addr = processSP->ResolveIndirectFunction(this, error);
 326       if (!error.Success())
 327         code_addr = LLDB_INVALID_ADDRESS;
 328     }
 329   } else {
 330     code_addr = GetLoadAddress(target);
 331   }
 332
 333   if (code_addr == LLDB_INVALID_ADDRESS)
 334     return code_addr;
 335
 336   if (target)
 337     return target->GetCallableLoadAddress(code_addr, GetAddressClass());
 338   return code_addr;
 339 }
 340
 341 bool Address::SetCallableLoadAddress(lldb::addr_t load_addr, Target *target) {
 342   if (SetLoadAddress(load_addr, target)) {
 343     if (target)
 344       m_offset = target->GetCallableLoadAddress(m_offset, GetAddressClass());
 345     return true;
 346   }
 347   return false;
 348 }
 349
 350 addr_t Address::GetOpcodeLoadAddress(Target *target,
 351                                      AddressClass addr_class) const {
 352   addr_t code_addr = GetLoadAddress(target);
 353   if (code_addr != LLDB_INVALID_ADDRESS) {
 354     if (addr_class == AddressClass::eInvalid)
 355       addr_class = GetAddressClass();
 356     code_addr = target->GetOpcodeLoadAddress(code_addr, addr_class);
 357   }
 358   return code_addr;
 359 }
 360
 361 bool Address::SetOpcodeLoadAddress(lldb::addr_t load_addr, Target *target,
 362                                    AddressClass addr_class,
 363                                    bool allow_section_end) {
 364   if (SetLoadAddress(load_addr, target, allow_section_end)) {
 365     if (target) {
 366       if (addr_class == AddressClass::eInvalid)
 367         addr_class = GetAddressClass();
 368       m_offset = target->GetOpcodeLoadAddress(m_offset, addr_class);
 369     }
 370     return true;
 371   }
 372   return false;
 373 }
 374
 375 bool Address::Dump(Stream *s, ExecutionContextScope *exe_scope, DumpStyle style,
 376                    DumpStyle fallback_style, uint32_t addr_size) const {
 377   // If the section was nullptr, only load address is going to work unless we
 378   // are trying to deref a pointer
 379   SectionSP section_sp(GetSection());
 380   if (!section_sp && style != DumpStyleResolvedPointerDescription)
 381     style = DumpStyleLoadAddress;
 382
 383   ExecutionContext exe_ctx(exe_scope);
 384   Target *target = exe_ctx.GetTargetPtr();
 385   // If addr_byte_size is UINT32_MAX, then determine the correct address byte
 386   // size for the process or default to the size of addr_t
 387   if (addr_size == UINT32_MAX) {
 388     if (target)
 389       addr_size = target->GetArchitecture().GetAddressByteSize();
 390     else
 391       addr_size = sizeof(addr_t);
 392   }
 393
 394   Address so_addr;
 395   switch (style) {
 396   case DumpStyleInvalid:
 397     return false;
 398
 399   case DumpStyleSectionNameOffset:
 400     if (section_sp) {
 401       section_sp->DumpName(s);
 402       s->Printf(" + %" PRIu64, m_offset);
 403     } else {
 404       s->Address(m_offset, addr_size);
 405     }
 406     break;
 407
 408   case DumpStyleSectionPointerOffset:
 409     s->Printf("(Section *)%p + ", static_cast<void *>(section_sp.get()));
 410     s->Address(m_offset, addr_size);
 411     break;
 412
 413   case DumpStyleModuleWithFileAddress:
 414     if (section_sp) {
 415       ModuleSP module_sp = section_sp->GetModule();
 416       if (module_sp)
 417         s->Printf("%s[", module_sp->GetFileSpec().GetFilename().AsCString(
 418                              "<Unknown>"));
 419       else
 420         s->Printf("%s[", "<Unknown>");
 421     }
 422     LLVM_FALLTHROUGH;
 423   case DumpStyleFileAddress: {
 424     addr_t file_addr = GetFileAddress();
 425     if (file_addr == LLDB_INVALID_ADDRESS) {
 426       if (fallback_style != DumpStyleInvalid)
 427         return Dump(s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
 428       return false;
 429     }
 430     s->Address(file_addr, addr_size);
 431     if (style == DumpStyleModuleWithFileAddress && section_sp)
 432       s->PutChar(']');
 433   } break;
 434
 435   case DumpStyleLoadAddress: {
 436     addr_t load_addr = GetLoadAddress(target);
 437
 438     /*
 439      * MIPS:
 440      * Display address in compressed form for MIPS16 or microMIPS
 441      * if the address belongs to AddressClass::eCodeAlternateISA.
 442     */
 443     if (target) {
 444       const llvm::Triple::ArchType llvm_arch =
 445           target->GetArchitecture().GetMachine();
 446       if (llvm_arch == llvm::Triple::mips ||
 447           llvm_arch == llvm::Triple::mipsel ||
 448           llvm_arch == llvm::Triple::mips64 ||
 449           llvm_arch == llvm::Triple::mips64el)
 450         load_addr = GetCallableLoadAddress(target);
 451     }
 452
 453     if (load_addr == LLDB_INVALID_ADDRESS) {
 454       if (fallback_style != DumpStyleInvalid)
 455         return Dump(s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
 456       return false;
 457     }
 458     s->Address(load_addr, addr_size);
 459   } break;
 460
 461   case DumpStyleResolvedDescription:
 462   case DumpStyleResolvedDescriptionNoModule:
 463   case DumpStyleResolvedDescriptionNoFunctionArguments:
 464   case DumpStyleNoFunctionName:
 465     if (IsSectionOffset()) {
 466       uint32_t pointer_size = 4;
 467       ModuleSP module_sp(GetModule());
 468       if (target)
 469         pointer_size = target->GetArchitecture().GetAddressByteSize();
 470       else if (module_sp)
 471         pointer_size = module_sp->GetArchitecture().GetAddressByteSize();
 472
 473       bool showed_info = false;
 474       if (section_sp) {
 475         SectionType sect_type = section_sp->GetType();
 476         switch (sect_type) {
 477         case eSectionTypeData:
 478           if (module_sp) {
 479             SymbolVendor *sym_vendor = module_sp->GetSymbolVendor();
 480             if (sym_vendor) {
 481               Symtab *symtab = sym_vendor->GetSymtab();
 482               if (symtab) {
 483                 const addr_t file_Addr = GetFileAddress();
 484                 Symbol *symbol =
 485                     symtab->FindSymbolContainingFileAddress(file_Addr);
 486                 if (symbol) {
 487                   const char *symbol_name = symbol->GetName().AsCString();
 488                   if (symbol_name) {
 489                     s->PutCString(symbol_name);
 490                     addr_t delta =
 491                         file_Addr - symbol->GetAddressRef().GetFileAddress();
 492                     if (delta)
 493                       s->Printf(" + %" PRIu64, delta);
 494                     showed_info = true;
 495                   }
 496                 }
 497               }
 498             }
 499           }
 500           break;
 501
 502         case eSectionTypeDataCString:
 503           // Read the C string from memory and display it
 504           showed_info = true;
 505           ReadCStringFromMemory(exe_scope, *this, s);
 506           break;
 507
 508         case eSectionTypeDataCStringPointers:
 509           if (ReadAddress(exe_scope, *this, pointer_size, so_addr)) {
 510 #if VERBOSE_OUTPUT
 511             s->PutCString("(char *)");
 512             so_addr.Dump(s, exe_scope, DumpStyleLoadAddress,
 513                          DumpStyleFileAddress);
 514             s->PutCString(": ");
 515 #endif
 516             showed_info = true;
 517             ReadCStringFromMemory(exe_scope, so_addr, s);
 518           }
 519           break;
 520
 521         case eSectionTypeDataObjCMessageRefs:
 522           if (ReadAddress(exe_scope, *this, pointer_size, so_addr)) {
 523             if (target && so_addr.IsSectionOffset()) {
 524               SymbolContext func_sc;
 525               target->GetImages().ResolveSymbolContextForAddress(
 526                   so_addr, eSymbolContextEverything, func_sc);
 527               if (func_sc.function != nullptr || func_sc.symbol != nullptr) {
 528                 showed_info = true;
 529 #if VERBOSE_OUTPUT
 530                 s->PutCString("(objc_msgref *) -> { (func*)");
 531                 so_addr.Dump(s, exe_scope, DumpStyleLoadAddress,
 532                              DumpStyleFileAddress);
 533 #else
 534                 s->PutCString("{ ");
 535 #endif
 536                 Address cstr_addr(*this);
 537                 cstr_addr.SetOffset(cstr_addr.GetOffset() + pointer_size);
 538                 func_sc.DumpStopContext(s, exe_scope, so_addr, true, true,
 539                                         false, true, true);
 540                 if (ReadAddress(exe_scope, cstr_addr, pointer_size, so_addr)) {
 541 #if VERBOSE_OUTPUT
 542                   s->PutCString("), (char *)");
 543                   so_addr.Dump(s, exe_scope, DumpStyleLoadAddress,
 544                                DumpStyleFileAddress);
 545                   s->PutCString(" (");
 546 #else
 547                   s->PutCString(", ");
 548 #endif
 549                   ReadCStringFromMemory(exe_scope, so_addr, s);
 550                 }
 551 #if VERBOSE_OUTPUT
 552                 s->PutCString(") }");
 553 #else
 554                 s->PutCString(" }");
 555 #endif
 556               }
 557             }
 558           }
 559           break;
 560
 561         case eSectionTypeDataObjCCFStrings: {
 562           Address cfstring_data_addr(*this);
 563           cfstring_data_addr.SetOffset(cfstring_data_addr.GetOffset() +
 564                                        (2 * pointer_size));
 565           if (ReadAddress(exe_scope, cfstring_data_addr, pointer_size,
 566                           so_addr)) {
 567 #if VERBOSE_OUTPUT
 568             s->PutCString("(CFString *) ");
 569             cfstring_data_addr.Dump(s, exe_scope, DumpStyleLoadAddress,
 570                                     DumpStyleFileAddress);
 571             s->PutCString(" -> @");
 572 #else
 573             s->PutChar('@');
 574 #endif
 575             if (so_addr.Dump(s, exe_scope, DumpStyleResolvedDescription))
 576               showed_info = true;
 577           }
 578         } break;
 579
 580         case eSectionTypeData4:
 581           // Read the 4 byte data and display it
 582           showed_info = true;
 583           s->PutCString("(uint32_t) ");
 584           DumpUInt(exe_scope, *this, 4, s);
 585           break;
 586
 587         case eSectionTypeData8:
 588           // Read the 8 byte data and display it
 589           showed_info = true;
 590           s->PutCString("(uint64_t) ");
 591           DumpUInt(exe_scope, *this, 8, s);
 592           break;
 593
 594         case eSectionTypeData16:
 595           // Read the 16 byte data and display it
 596           showed_info = true;
 597           s->PutCString("(uint128_t) ");
 598           DumpUInt(exe_scope, *this, 16, s);
 599           break;
 600
 601         case eSectionTypeDataPointers:
 602           // Read the pointer data and display it
 603           if (ReadAddress(exe_scope, *this, pointer_size, so_addr)) {
 604             s->PutCString("(void *)");
 605             so_addr.Dump(s, exe_scope, DumpStyleLoadAddress,
 606                          DumpStyleFileAddress);
 607
 608             showed_info = true;
 609             if (so_addr.IsSectionOffset()) {
 610               SymbolContext pointer_sc;
 611               if (target) {
 612                 target->GetImages().ResolveSymbolContextForAddress(
 613                     so_addr, eSymbolContextEverything, pointer_sc);
 614                 if (pointer_sc.function != nullptr ||
 615                     pointer_sc.symbol != nullptr) {
 616                   s->PutCString(": ");
 617                   pointer_sc.DumpStopContext(s, exe_scope, so_addr, true, false,
 618                                              false, true, true);
 619                 }
 620               }
 621             }
 622           }
 623           break;
 624
 625         default:
 626           break;
 627         }
 628       }
 629
 630       if (!showed_info) {
 631         if (module_sp) {
 632           SymbolContext sc;
 633           module_sp->ResolveSymbolContextForAddress(
 634               *this, eSymbolContextEverything, sc);
 635           if (sc.function || sc.symbol) {
 636             bool show_stop_context = true;
 637             const bool show_module = (style == DumpStyleResolvedDescription);
 638             const bool show_fullpaths = false;
 639             const bool show_inlined_frames = true;
 640             const bool show_function_arguments =
 641                 (style != DumpStyleResolvedDescriptionNoFunctionArguments);
 642             const bool show_function_name = (style != DumpStyleNoFunctionName);
 643             if (sc.function == nullptr && sc.symbol != nullptr) {
 644               // If we have just a symbol make sure it is in the right section
 645               if (sc.symbol->ValueIsAddress()) {
 646                 if (sc.symbol->GetAddressRef().GetSection() != GetSection()) {
 647                   // don't show the module if the symbol is a trampoline symbol
 648                   show_stop_context = false;
 649                 }
 650               }
 651             }
 652             if (show_stop_context) {
 653               // We have a function or a symbol from the same sections as this
 654               // address.
 655               sc.DumpStopContext(s, exe_scope, *this, show_fullpaths,
 656                                  show_module, show_inlined_frames,
 657                                  show_function_arguments, show_function_name);
 658             } else {
 659               // We found a symbol but it was in a different section so it
 660               // isn't the symbol we should be showing, just show the section
 661               // name + offset
 662               Dump(s, exe_scope, DumpStyleSectionNameOffset);
 663             }
 664           }
 665         }
 666       }
 667     } else {
 668       if (fallback_style != DumpStyleInvalid)
 669         return Dump(s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
 670       return false;
 671     }
 672     break;
 673
 674   case DumpStyleDetailedSymbolContext:
 675     if (IsSectionOffset()) {
 676       ModuleSP module_sp(GetModule());
 677       if (module_sp) {
 678         SymbolContext sc;
 679         module_sp->ResolveSymbolContextForAddress(
 680             *this, eSymbolContextEverything | eSymbolContextVariable, sc);
 681         if (sc.symbol) {
 682           // If we have just a symbol make sure it is in the same section as
 683           // our address. If it isn't, then we might have just found the last
 684           // symbol that came before the address that we are looking up that
 685           // has nothing to do with our address lookup.
 686           if (sc.symbol->ValueIsAddress() &&
 687               sc.symbol->GetAddressRef().GetSection() != GetSection())
 688             sc.symbol = nullptr;
 689         }
 690         sc.GetDescription(s, eDescriptionLevelBrief, target);
 691
 692         if (sc.block) {
 693           bool can_create = true;
 694           bool get_parent_variables = true;
 695           bool stop_if_block_is_inlined_function = false;
 696           VariableList variable_list;
 697           sc.block->AppendVariables(can_create, get_parent_variables,
 698                                     stop_if_block_is_inlined_function,
 699                                     [](Variable *) { return true; },
 700                                     &variable_list);
 701
 702           const size_t num_variables = variable_list.GetSize();
 703           for (size_t var_idx = 0; var_idx < num_variables; ++var_idx) {
 704             Variable *var = variable_list.GetVariableAtIndex(var_idx).get();
 705             if (var && var->LocationIsValidForAddress(*this)) {
 706               s->Indent();
 707               s->Printf("   Variable: id = {0x%8.8" PRIx64 "}, name = \"%s\"",
 708                         var->GetID(), var->GetName().GetCString());
 709               Type *type = var->GetType();
 710               if (type)
 711                 s->Printf(", type = \"%s\"", type->GetName().GetCString());
 712               else
 713                 s->PutCString(", type = <unknown>");
 714               s->PutCString(", location = ");
 715               var->DumpLocationForAddress(s, *this);
 716               s->PutCString(", decl = ");
 717               var->GetDeclaration().DumpStopContext(s, false);
 718               s->EOL();
 719             }
 720           }
 721         }
 722       }
 723     } else {
 724       if (fallback_style != DumpStyleInvalid)
 725         return Dump(s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
 726       return false;
 727     }
 728     break;
 729
 730   case DumpStyleResolvedPointerDescription: {
 731     Process *process = exe_ctx.GetProcessPtr();
 732     if (process) {
 733       addr_t load_addr = GetLoadAddress(target);
 734       if (load_addr != LLDB_INVALID_ADDRESS) {
 735         Status memory_error;
 736         addr_t dereferenced_load_addr =
 737             process->ReadPointerFromMemory(load_addr, memory_error);
 738         if (dereferenced_load_addr != LLDB_INVALID_ADDRESS) {
 739           Address dereferenced_addr;
 740           if (dereferenced_addr.SetLoadAddress(dereferenced_load_addr,
 741                                                target)) {
 742             StreamString strm;
 743             if (dereferenced_addr.Dump(&strm, exe_scope,
 744                                        DumpStyleResolvedDescription,
 745                                        DumpStyleInvalid, addr_size)) {
 746               s->Address(dereferenced_load_addr, addr_size, " -> ", " ");
 747               s->Write(strm.GetString().data(), strm.GetSize());
 748               return true;
 749             }
 750           }
 751         }
 752       }
 753     }
 754     if (fallback_style != DumpStyleInvalid)
 755       return Dump(s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
 756     return false;
 757   } break;
 758   }
 759
 760   return true;
 761 }
 762
 763 bool Address::SectionWasDeleted() const {
 764   if (GetSection())
 765     return false;
 766   return SectionWasDeletedPrivate();
 767 }
 768
 769 bool Address::SectionWasDeletedPrivate() const {
 770   lldb::SectionWP empty_section_wp;
 771
 772   // If either call to "std::weak_ptr::owner_before(...) value returns true,
 773   // this indicates that m_section_wp once contained (possibly still does) a
 774   // reference to a valid shared pointer. This helps us know if we had a valid
 775   // reference to a section which is now invalid because the module it was in
 776   // was unloaded/deleted, or if the address doesn't have a valid reference to
 777   // a section.
 778   return empty_section_wp.owner_before(m_section_wp) ||
 779          m_section_wp.owner_before(empty_section_wp);
 780 }
 781
 782 uint32_t Address::CalculateSymbolContext(SymbolContext *sc,
 783                                          uint32_t resolve_scope) const {
 784   sc->Clear(false);
 785   // Absolute addresses don't have enough information to reconstruct even their
 786   // target.
 787
 788   SectionSP section_sp(GetSection());
 789   if (section_sp) {
 790     ModuleSP module_sp(section_sp->GetModule());
 791     if (module_sp) {
 792       sc->module_sp = module_sp;
 793       if (sc->module_sp)
 794         return sc->module_sp->ResolveSymbolContextForAddress(
 795             *this, resolve_scope, *sc);
 796     }
 797   }
 798   return 0;
 799 }
 800
 801 ModuleSP Address::CalculateSymbolContextModule() const {
 802   SectionSP section_sp(GetSection());
 803   if (section_sp)
 804     return section_sp->GetModule();
 805   return ModuleSP();
 806 }
 807
 808 CompileUnit *Address::CalculateSymbolContextCompileUnit() const {
 809   SectionSP section_sp(GetSection());
 810   if (section_sp) {
 811     SymbolContext sc;
 812     sc.module_sp = section_sp->GetModule();
 813     if (sc.module_sp) {
 814       sc.module_sp->ResolveSymbolContextForAddress(*this,
 815                                                    eSymbolContextCompUnit, sc);
 816       return sc.comp_unit;
 817     }
 818   }
 819   return nullptr;
 820 }
 821
 822 Function *Address::CalculateSymbolContextFunction() const {
 823   SectionSP section_sp(GetSection());
 824   if (section_sp) {
 825     SymbolContext sc;
 826     sc.module_sp = section_sp->GetModule();
 827     if (sc.module_sp) {
 828       sc.module_sp->ResolveSymbolContextForAddress(*this,
 829                                                    eSymbolContextFunction, sc);
 830       return sc.function;
 831     }
 832   }
 833   return nullptr;
 834 }
 835
 836 Block *Address::CalculateSymbolContextBlock() const {
 837   SectionSP section_sp(GetSection());
 838   if (section_sp) {
 839     SymbolContext sc;
 840     sc.module_sp = section_sp->GetModule();
 841     if (sc.module_sp) {
 842       sc.module_sp->ResolveSymbolContextForAddress(*this, eSymbolContextBlock,
 843                                                    sc);
 844       return sc.block;
 845     }
 846   }
 847   return nullptr;
 848 }
 849
 850 Symbol *Address::CalculateSymbolContextSymbol() const {
 851   SectionSP section_sp(GetSection());
 852   if (section_sp) {
 853     SymbolContext sc;
 854     sc.module_sp = section_sp->GetModule();
 855     if (sc.module_sp) {
 856       sc.module_sp->ResolveSymbolContextForAddress(*this, eSymbolContextSymbol,
 857                                                    sc);
 858       return sc.symbol;
 859     }
 860   }
 861   return nullptr;
 862 }
 863
 864 bool Address::CalculateSymbolContextLineEntry(LineEntry &line_entry) const {
 865   SectionSP section_sp(GetSection());
 866   if (section_sp) {
 867     SymbolContext sc;
 868     sc.module_sp = section_sp->GetModule();
 869     if (sc.module_sp) {
 870       sc.module_sp->ResolveSymbolContextForAddress(*this,
 871                                                    eSymbolContextLineEntry, sc);
 872       if (sc.line_entry.IsValid()) {
 873         line_entry = sc.line_entry;
 874         return true;
 875       }
 876     }
 877   }
 878   line_entry.Clear();
 879   return false;
 880 }
 881
 882 int Address::CompareFileAddress(const Address &a, const Address &b) {
 883   addr_t a_file_addr = a.GetFileAddress();
 884   addr_t b_file_addr = b.GetFileAddress();
 885   if (a_file_addr < b_file_addr)
 886     return -1;
 887   if (a_file_addr > b_file_addr)
 888     return +1;
 889   return 0;
 890 }
 891
 892 int Address::CompareLoadAddress(const Address &a, const Address &b,
 893                                 Target *target) {
 894   assert(target != nullptr);
 895   addr_t a_load_addr = a.GetLoadAddress(target);
 896   addr_t b_load_addr = b.GetLoadAddress(target);
 897   if (a_load_addr < b_load_addr)
 898     return -1;
 899   if (a_load_addr > b_load_addr)
 900     return +1;
 901   return 0;
 902 }
 903
 904 int Address::CompareModulePointerAndOffset(const Address &a, const Address &b) {
 905   ModuleSP a_module_sp(a.GetModule());
 906   ModuleSP b_module_sp(b.GetModule());
 907   Module *a_module = a_module_sp.get();
 908   Module *b_module = b_module_sp.get();
 909   if (a_module < b_module)
 910     return -1;
 911   if (a_module > b_module)
 912     return +1;
 913   // Modules are the same, just compare the file address since they should be
 914   // unique
 915   addr_t a_file_addr = a.GetFileAddress();
 916   addr_t b_file_addr = b.GetFileAddress();
 917   if (a_file_addr < b_file_addr)
 918     return -1;
 919   if (a_file_addr > b_file_addr)
 920     return +1;
 921   return 0;
 922 }
 923
 924 size_t Address::MemorySize() const {
 925   // Noting special for the memory size of a single Address object, it is just
 926   // the size of itself.
 927   return sizeof(Address);
 928 }
 929
 930 //----------------------------------------------------------------------
 931 // NOTE: Be careful using this operator. It can correctly compare two
 932 // addresses from the same Module correctly. It can't compare two addresses
 933 // from different modules in any meaningful way, but it will compare the module
 934 // pointers.
 935 //
 936 // To sum things up:
 937 // - works great for addresses within the same module - it works for addresses
 938 // across multiple modules, but don't expect the
 939 //   address results to make much sense
 940 //
 941 // This basically lets Address objects be used in ordered collection classes.
 942 //----------------------------------------------------------------------
 943
 944 bool lldb_private::operator<(const Address &lhs, const Address &rhs) {
 945   ModuleSP lhs_module_sp(lhs.GetModule());
 946   ModuleSP rhs_module_sp(rhs.GetModule());
 947   Module *lhs_module = lhs_module_sp.get();
 948   Module *rhs_module = rhs_module_sp.get();
 949   if (lhs_module == rhs_module) {
 950     // Addresses are in the same module, just compare the file addresses
 951     return lhs.GetFileAddress() < rhs.GetFileAddress();
 952   } else {
 953     // The addresses are from different modules, just use the module pointer
 954     // value to get consistent ordering
 955     return lhs_module < rhs_module;
 956   }
 957 }
 958
 959 bool lldb_private::operator>(const Address &lhs, const Address &rhs) {
 960   ModuleSP lhs_module_sp(lhs.GetModule());
 961   ModuleSP rhs_module_sp(rhs.GetModule());
 962   Module *lhs_module = lhs_module_sp.get();
 963   Module *rhs_module = rhs_module_sp.get();
 964   if (lhs_module == rhs_module) {
 965     // Addresses are in the same module, just compare the file addresses
 966     return lhs.GetFileAddress() > rhs.GetFileAddress();
 967   } else {
 968     // The addresses are from different modules, just use the module pointer
 969     // value to get consistent ordering
 970     return lhs_module > rhs_module;
 971   }
 972 }
 973
 974 // The operator == checks for exact equality only (same section, same offset)
 975 bool lldb_private::operator==(const Address &a, const Address &rhs) {
 976   return a.GetOffset() == rhs.GetOffset() && a.GetSection() == rhs.GetSection();
 977 }
 978
 979 // The operator != checks for exact inequality only (differing section, or
 980 // different offset)
 981 bool lldb_private::operator!=(const Address &a, const Address &rhs) {
 982   return a.GetOffset() != rhs.GetOffset() || a.GetSection() != rhs.GetSection();
 983 }
 984
 985 AddressClass Address::GetAddressClass() const {
 986   ModuleSP module_sp(GetModule());
 987   if (module_sp) {
 988     ObjectFile *obj_file = module_sp->GetObjectFile();
 989     if (obj_file) {
 990       // Give the symbol vendor a chance to add to the unified section list.
 991       module_sp->GetSymbolVendor();
 992       return obj_file->GetAddressClass(GetFileAddress());
 993     }
 994   }
 995   return AddressClass::eUnknown;
 996 }
 997
 998 bool Address::SetLoadAddress(lldb::addr_t load_addr, Target *target,
 999                              bool allow_section_end) {
1000   if (target && target->GetSectionLoadList().ResolveLoadAddress(
1001                     load_addr, *this, allow_section_end))
1002     return true;
1003   m_section_wp.reset();
1004   m_offset = load_addr;
1005   return false;
1006 }