1//===-- DWARFDebugInfoEntry.cpp -------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#include "DWARFDebugInfoEntry.h" 10 11#include <cassert> 12 13#include <algorithm> 14#include <optional> 15 16#include "llvm/Support/LEB128.h" 17 18#include "lldb/Core/Module.h" 19#include "lldb/Expression/DWARFExpression.h" 20#include "lldb/Symbol/ObjectFile.h" 21#include "lldb/Utility/Stream.h" 22#include "lldb/Utility/StreamString.h" 23 24#include "DWARFCompileUnit.h" 25#include "DWARFDebugAranges.h" 26#include "DWARFDebugInfo.h" 27#include "DWARFDebugRanges.h" 28#include "DWARFDeclContext.h" 29#include "DWARFFormValue.h" 30#include "DWARFUnit.h" 31#include "SymbolFileDWARF.h" 32#include "SymbolFileDWARFDwo.h" 33 34#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h" 35 36using namespace lldb_private; 37using namespace lldb_private::dwarf; 38using namespace lldb_private::plugin::dwarf; 39extern int g_verbose; 40 41// Extract a debug info entry for a given DWARFUnit from the data 42// starting at the offset in offset_ptr 43bool DWARFDebugInfoEntry::Extract(const DWARFDataExtractor &data, 44 const DWARFUnit *cu, 45 lldb::offset_t *offset_ptr) { 46 m_offset = *offset_ptr; 47 m_parent_idx = 0; 48 m_sibling_idx = 0; 49 const uint64_t abbr_idx = data.GetULEB128(offset_ptr); 50 lldbassert(abbr_idx <= UINT16_MAX); 51 m_abbr_idx = abbr_idx; 52 53 if (m_abbr_idx == 0) { 54 m_tag = llvm::dwarf::DW_TAG_null; 55 m_has_children = false; 56 return true; // NULL debug tag entry 57 } 58 59 const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu); 60 if (abbrevDecl == nullptr) { 61 cu->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError( 62 "[{0:x16}]: invalid abbreviation code {1}, " 63 "please file a bug and " 64 "attach the file at the start of this error message", 65 (uint64_t)m_offset, (unsigned)abbr_idx); 66 // WE can't parse anymore if the DWARF is borked... 67 *offset_ptr = UINT32_MAX; 68 return false; 69 } 70 m_tag = abbrevDecl->getTag(); 71 m_has_children = abbrevDecl->hasChildren(); 72 // Skip all data in the .debug_info or .debug_types for the attributes 73 for (const auto &attribute : abbrevDecl->attributes()) { 74 if (DWARFFormValue::SkipValue(attribute.Form, data, offset_ptr, cu)) 75 continue; 76 77 cu->GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError( 78 "[{0:x16}]: Unsupported DW_FORM_{1:x}, please file a bug " 79 "and " 80 "attach the file at the start of this error message", 81 (uint64_t)m_offset, (unsigned)attribute.Form); 82 *offset_ptr = m_offset; 83 return false; 84 } 85 return true; 86} 87 88static DWARFRangeList GetRangesOrReportError(DWARFUnit &unit, 89 const DWARFDebugInfoEntry &die, 90 const DWARFFormValue &value) { 91 llvm::Expected<DWARFRangeList> expected_ranges = 92 (value.Form() == DW_FORM_rnglistx) 93 ? unit.FindRnglistFromIndex(value.Unsigned()) 94 : unit.FindRnglistFromOffset(value.Unsigned()); 95 if (expected_ranges) 96 return std::move(*expected_ranges); 97 98 unit.GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError( 99 "[{0:x16}]: DIE has DW_AT_ranges({1} {2:x16}) attribute, but " 100 "range extraction failed ({3}), please file a bug " 101 "and attach the file at the start of this error message", 102 die.GetOffset(), 103 llvm::dwarf::FormEncodingString(value.Form()).str().c_str(), 104 value.Unsigned(), toString(expected_ranges.takeError()).c_str()); 105 return DWARFRangeList(); 106} 107 108static void ExtractAttrAndFormValue( 109 const llvm::DWARFAbbreviationDeclaration::AttributeSpec &attr_spec, 110 dw_attr_t &attr, DWARFFormValue &form_value) { 111 attr = attr_spec.Attr; 112 form_value.FormRef() = attr_spec.Form; 113 if (attr_spec.isImplicitConst()) 114 form_value.SetSigned(attr_spec.getImplicitConstValue()); 115} 116 117// GetDIENamesAndRanges 118// 119// Gets the valid address ranges for a given DIE by looking for a 120// DW_AT_low_pc/DW_AT_high_pc pair, DW_AT_entry_pc, or DW_AT_ranges attributes. 121bool DWARFDebugInfoEntry::GetDIENamesAndRanges( 122 DWARFUnit *cu, const char *&name, const char *&mangled, 123 DWARFRangeList &ranges, std::optional<int> &decl_file, 124 std::optional<int> &decl_line, std::optional<int> &decl_column, 125 std::optional<int> &call_file, std::optional<int> &call_line, 126 std::optional<int> &call_column, DWARFExpressionList *frame_base) const { 127 dw_addr_t lo_pc = LLDB_INVALID_ADDRESS; 128 dw_addr_t hi_pc = LLDB_INVALID_ADDRESS; 129 std::vector<DWARFDIE> dies; 130 bool set_frame_base_loclist_addr = false; 131 132 SymbolFileDWARF &dwarf = cu->GetSymbolFileDWARF(); 133 lldb::ModuleSP module = dwarf.GetObjectFile()->GetModule(); 134 135 if (const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu)) { 136 const DWARFDataExtractor &data = cu->GetData(); 137 lldb::offset_t offset = GetFirstAttributeOffset(); 138 139 if (!data.ValidOffset(offset)) 140 return false; 141 142 bool do_offset = false; 143 144 for (const auto &attribute : abbrevDecl->attributes()) { 145 DWARFFormValue form_value(cu); 146 dw_attr_t attr; 147 ExtractAttrAndFormValue(attribute, attr, form_value); 148 149 if (form_value.ExtractValue(data, &offset)) { 150 switch (attr) { 151 case DW_AT_low_pc: 152 lo_pc = form_value.Address(); 153 154 if (do_offset) 155 hi_pc += lo_pc; 156 do_offset = false; 157 break; 158 159 case DW_AT_entry_pc: 160 lo_pc = form_value.Address(); 161 break; 162 163 case DW_AT_high_pc: 164 if (form_value.Form() == DW_FORM_addr || 165 form_value.Form() == DW_FORM_addrx || 166 form_value.Form() == DW_FORM_GNU_addr_index) { 167 hi_pc = form_value.Address(); 168 } else { 169 hi_pc = form_value.Unsigned(); 170 if (lo_pc == LLDB_INVALID_ADDRESS) 171 do_offset = hi_pc != LLDB_INVALID_ADDRESS; 172 else 173 hi_pc += lo_pc; // DWARF 4 introduces <offset-from-lo-pc> to save 174 // on relocations 175 } 176 break; 177 178 case DW_AT_ranges: 179 ranges = GetRangesOrReportError(*cu, *this, form_value); 180 break; 181 182 case DW_AT_name: 183 if (name == nullptr) 184 name = form_value.AsCString(); 185 break; 186 187 case DW_AT_MIPS_linkage_name: 188 case DW_AT_linkage_name: 189 if (mangled == nullptr) 190 mangled = form_value.AsCString(); 191 break; 192 193 case DW_AT_abstract_origin: 194 dies.push_back(form_value.Reference()); 195 break; 196 197 case DW_AT_specification: 198 dies.push_back(form_value.Reference()); 199 break; 200 201 case DW_AT_decl_file: 202 if (!decl_file) 203 decl_file = form_value.Unsigned(); 204 break; 205 206 case DW_AT_decl_line: 207 if (!decl_line) 208 decl_line = form_value.Unsigned(); 209 break; 210 211 case DW_AT_decl_column: 212 if (!decl_column) 213 decl_column = form_value.Unsigned(); 214 break; 215 216 case DW_AT_call_file: 217 if (!call_file) 218 call_file = form_value.Unsigned(); 219 break; 220 221 case DW_AT_call_line: 222 if (!call_line) 223 call_line = form_value.Unsigned(); 224 break; 225 226 case DW_AT_call_column: 227 if (!call_column) 228 call_column = form_value.Unsigned(); 229 break; 230 231 case DW_AT_frame_base: 232 if (frame_base) { 233 if (form_value.BlockData()) { 234 uint32_t block_offset = 235 form_value.BlockData() - data.GetDataStart(); 236 uint32_t block_length = form_value.Unsigned(); 237 *frame_base = 238 DWARFExpressionList(module, 239 DWARFExpression(DataExtractor( 240 data, block_offset, block_length)), 241 cu); 242 } else { 243 DataExtractor data = cu->GetLocationData(); 244 const dw_offset_t offset = form_value.Unsigned(); 245 if (data.ValidOffset(offset)) { 246 data = DataExtractor(data, offset, data.GetByteSize() - offset); 247 if (lo_pc != LLDB_INVALID_ADDRESS) { 248 assert(lo_pc >= cu->GetBaseAddress()); 249 DWARFExpression::ParseDWARFLocationList(cu, data, frame_base); 250 frame_base->SetFuncFileAddress(lo_pc); 251 } else 252 set_frame_base_loclist_addr = true; 253 } 254 } 255 } 256 break; 257 258 default: 259 break; 260 } 261 } 262 } 263 } 264 265 if (ranges.IsEmpty()) { 266 if (lo_pc != LLDB_INVALID_ADDRESS) { 267 if (hi_pc != LLDB_INVALID_ADDRESS && hi_pc > lo_pc) 268 ranges.Append(DWARFRangeList::Entry(lo_pc, hi_pc - lo_pc)); 269 else 270 ranges.Append(DWARFRangeList::Entry(lo_pc, 0)); 271 } 272 } 273 274 if (set_frame_base_loclist_addr) { 275 dw_addr_t lowest_range_pc = ranges.GetMinRangeBase(0); 276 assert(lowest_range_pc >= cu->GetBaseAddress()); 277 frame_base->SetFuncFileAddress(lowest_range_pc); 278 } 279 280 if (ranges.IsEmpty() || name == nullptr || mangled == nullptr) { 281 for (const DWARFDIE &die : dies) { 282 if (die) { 283 die.GetDIE()->GetDIENamesAndRanges(die.GetCU(), name, mangled, ranges, 284 decl_file, decl_line, decl_column, 285 call_file, call_line, call_column); 286 } 287 } 288 } 289 return !ranges.IsEmpty(); 290} 291 292// Get all attribute values for a given DIE, including following any 293// specification or abstract origin attributes and including those in the 294// results. Any duplicate attributes will have the first instance take 295// precedence (this can happen for declaration attributes). 296void DWARFDebugInfoEntry::GetAttributes(DWARFUnit *cu, 297 DWARFAttributes &attributes, 298 Recurse recurse, 299 uint32_t curr_depth) const { 300 const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu); 301 if (!abbrevDecl) { 302 attributes.Clear(); 303 return; 304 } 305 306 const DWARFDataExtractor &data = cu->GetData(); 307 lldb::offset_t offset = GetFirstAttributeOffset(); 308 309 for (const auto &attribute : abbrevDecl->attributes()) { 310 DWARFFormValue form_value(cu); 311 dw_attr_t attr; 312 ExtractAttrAndFormValue(attribute, attr, form_value); 313 314 // If we are tracking down DW_AT_specification or DW_AT_abstract_origin 315 // attributes, the depth will be non-zero. We need to omit certain 316 // attributes that don't make sense. 317 switch (attr) { 318 case DW_AT_sibling: 319 case DW_AT_declaration: 320 if (curr_depth > 0) { 321 // This attribute doesn't make sense when combined with the DIE that 322 // references this DIE. We know a DIE is referencing this DIE because 323 // curr_depth is not zero 324 break; 325 } 326 [[fallthrough]]; 327 default: 328 attributes.Append(form_value, offset, attr); 329 break; 330 } 331 332 if (recurse == Recurse::yes && 333 ((attr == DW_AT_specification) || (attr == DW_AT_abstract_origin))) { 334 if (form_value.ExtractValue(data, &offset)) { 335 DWARFDIE spec_die = form_value.Reference(); 336 if (spec_die) 337 spec_die.GetDIE()->GetAttributes(spec_die.GetCU(), attributes, 338 recurse, curr_depth + 1); 339 } 340 } else { 341 const dw_form_t form = form_value.Form(); 342 std::optional<uint8_t> fixed_skip_size = 343 DWARFFormValue::GetFixedSize(form, cu); 344 if (fixed_skip_size) 345 offset += *fixed_skip_size; 346 else 347 DWARFFormValue::SkipValue(form, data, &offset, cu); 348 } 349 } 350} 351 352// GetAttributeValue 353// 354// Get the value of an attribute and return the .debug_info or .debug_types 355// offset of the attribute if it was properly extracted into form_value, 356// or zero if we fail since an offset of zero is invalid for an attribute (it 357// would be a compile unit header). 358dw_offset_t DWARFDebugInfoEntry::GetAttributeValue( 359 const DWARFUnit *cu, const dw_attr_t attr, DWARFFormValue &form_value, 360 dw_offset_t *end_attr_offset_ptr, 361 bool check_specification_or_abstract_origin) const { 362 if (const auto *abbrevDecl = GetAbbreviationDeclarationPtr(cu)) { 363 std::optional<uint32_t> attr_idx = abbrevDecl->findAttributeIndex(attr); 364 365 if (attr_idx) { 366 const DWARFDataExtractor &data = cu->GetData(); 367 lldb::offset_t offset = GetFirstAttributeOffset(); 368 369 uint32_t idx = 0; 370 while (idx < *attr_idx) 371 DWARFFormValue::SkipValue(abbrevDecl->getFormByIndex(idx++), data, 372 &offset, cu); 373 374 const dw_offset_t attr_offset = offset; 375 form_value.SetUnit(cu); 376 form_value.SetForm(abbrevDecl->getFormByIndex(idx)); 377 if (form_value.ExtractValue(data, &offset)) { 378 if (end_attr_offset_ptr) 379 *end_attr_offset_ptr = offset; 380 return attr_offset; 381 } 382 } 383 } 384 385 if (check_specification_or_abstract_origin) { 386 if (GetAttributeValue(cu, DW_AT_specification, form_value)) { 387 DWARFDIE die = form_value.Reference(); 388 if (die) { 389 dw_offset_t die_offset = die.GetDIE()->GetAttributeValue( 390 die.GetCU(), attr, form_value, end_attr_offset_ptr, false); 391 if (die_offset) 392 return die_offset; 393 } 394 } 395 396 if (GetAttributeValue(cu, DW_AT_abstract_origin, form_value)) { 397 DWARFDIE die = form_value.Reference(); 398 if (die) { 399 dw_offset_t die_offset = die.GetDIE()->GetAttributeValue( 400 die.GetCU(), attr, form_value, end_attr_offset_ptr, false); 401 if (die_offset) 402 return die_offset; 403 } 404 } 405 } 406 return 0; 407} 408 409// GetAttributeValueAsString 410// 411// Get the value of an attribute as a string return it. The resulting pointer 412// to the string data exists within the supplied SymbolFileDWARF and will only 413// be available as long as the SymbolFileDWARF is still around and it's content 414// doesn't change. 415const char *DWARFDebugInfoEntry::GetAttributeValueAsString( 416 const DWARFUnit *cu, const dw_attr_t attr, const char *fail_value, 417 bool check_specification_or_abstract_origin) const { 418 DWARFFormValue form_value; 419 if (GetAttributeValue(cu, attr, form_value, nullptr, 420 check_specification_or_abstract_origin)) 421 return form_value.AsCString(); 422 return fail_value; 423} 424 425// GetAttributeValueAsUnsigned 426// 427// Get the value of an attribute as unsigned and return it. 428uint64_t DWARFDebugInfoEntry::GetAttributeValueAsUnsigned( 429 const DWARFUnit *cu, const dw_attr_t attr, uint64_t fail_value, 430 bool check_specification_or_abstract_origin) const { 431 DWARFFormValue form_value; 432 if (GetAttributeValue(cu, attr, form_value, nullptr, 433 check_specification_or_abstract_origin)) 434 return form_value.Unsigned(); 435 return fail_value; 436} 437 438std::optional<uint64_t> 439DWARFDebugInfoEntry::GetAttributeValueAsOptionalUnsigned( 440 const DWARFUnit *cu, const dw_attr_t attr, 441 bool check_specification_or_abstract_origin) const { 442 DWARFFormValue form_value; 443 if (GetAttributeValue(cu, attr, form_value, nullptr, 444 check_specification_or_abstract_origin)) 445 return form_value.Unsigned(); 446 return std::nullopt; 447} 448 449// GetAttributeValueAsReference 450// 451// Get the value of an attribute as reference and fix up and compile unit 452// relative offsets as needed. 453DWARFDIE DWARFDebugInfoEntry::GetAttributeValueAsReference( 454 const DWARFUnit *cu, const dw_attr_t attr, 455 bool check_specification_or_abstract_origin) const { 456 DWARFFormValue form_value; 457 if (GetAttributeValue(cu, attr, form_value, nullptr, 458 check_specification_or_abstract_origin)) 459 return form_value.Reference(); 460 return {}; 461} 462 463uint64_t DWARFDebugInfoEntry::GetAttributeValueAsAddress( 464 const DWARFUnit *cu, const dw_attr_t attr, uint64_t fail_value, 465 bool check_specification_or_abstract_origin) const { 466 DWARFFormValue form_value; 467 if (GetAttributeValue(cu, attr, form_value, nullptr, 468 check_specification_or_abstract_origin)) 469 return form_value.Address(); 470 return fail_value; 471} 472 473// GetAttributeHighPC 474// 475// Get the hi_pc, adding hi_pc to lo_pc when specified as an <offset-from-low- 476// pc>. 477// 478// Returns the hi_pc or fail_value. 479dw_addr_t DWARFDebugInfoEntry::GetAttributeHighPC( 480 const DWARFUnit *cu, dw_addr_t lo_pc, uint64_t fail_value, 481 bool check_specification_or_abstract_origin) const { 482 DWARFFormValue form_value; 483 if (GetAttributeValue(cu, DW_AT_high_pc, form_value, nullptr, 484 check_specification_or_abstract_origin)) { 485 dw_form_t form = form_value.Form(); 486 if (form == DW_FORM_addr || form == DW_FORM_addrx || 487 form == DW_FORM_GNU_addr_index) 488 return form_value.Address(); 489 490 // DWARF4 can specify the hi_pc as an <offset-from-lowpc> 491 return lo_pc + form_value.Unsigned(); 492 } 493 return fail_value; 494} 495 496// GetAttributeAddressRange 497// 498// Get the lo_pc and hi_pc, adding hi_pc to lo_pc when specified as an <offset- 499// from-low-pc>. 500// 501// Returns true or sets lo_pc and hi_pc to fail_value. 502bool DWARFDebugInfoEntry::GetAttributeAddressRange( 503 const DWARFUnit *cu, dw_addr_t &lo_pc, dw_addr_t &hi_pc, 504 uint64_t fail_value, bool check_specification_or_abstract_origin) const { 505 lo_pc = GetAttributeValueAsAddress(cu, DW_AT_low_pc, fail_value, 506 check_specification_or_abstract_origin); 507 if (lo_pc != fail_value) { 508 hi_pc = GetAttributeHighPC(cu, lo_pc, fail_value, 509 check_specification_or_abstract_origin); 510 if (hi_pc != fail_value) 511 return true; 512 } 513 lo_pc = fail_value; 514 hi_pc = fail_value; 515 return false; 516} 517 518DWARFRangeList DWARFDebugInfoEntry::GetAttributeAddressRanges( 519 DWARFUnit *cu, bool check_hi_lo_pc, 520 bool check_specification_or_abstract_origin) const { 521 522 DWARFFormValue form_value; 523 if (GetAttributeValue(cu, DW_AT_ranges, form_value)) 524 return GetRangesOrReportError(*cu, *this, form_value); 525 526 DWARFRangeList ranges; 527 if (check_hi_lo_pc) { 528 dw_addr_t lo_pc = LLDB_INVALID_ADDRESS; 529 dw_addr_t hi_pc = LLDB_INVALID_ADDRESS; 530 if (GetAttributeAddressRange(cu, lo_pc, hi_pc, LLDB_INVALID_ADDRESS, 531 check_specification_or_abstract_origin)) { 532 if (lo_pc < hi_pc) 533 ranges.Append(DWARFRangeList::Entry(lo_pc, hi_pc - lo_pc)); 534 } 535 } 536 return ranges; 537} 538 539// GetName 540// 541// Get value of the DW_AT_name attribute and return it if one exists, else 542// return NULL. 543const char *DWARFDebugInfoEntry::GetName(const DWARFUnit *cu) const { 544 return GetAttributeValueAsString(cu, DW_AT_name, nullptr, true); 545} 546 547// GetMangledName 548// 549// Get value of the DW_AT_MIPS_linkage_name attribute and return it if one 550// exists, else return the value of the DW_AT_name attribute 551const char * 552DWARFDebugInfoEntry::GetMangledName(const DWARFUnit *cu, 553 bool substitute_name_allowed) const { 554 const char *name = nullptr; 555 556 name = GetAttributeValueAsString(cu, DW_AT_MIPS_linkage_name, nullptr, true); 557 if (name) 558 return name; 559 560 name = GetAttributeValueAsString(cu, DW_AT_linkage_name, nullptr, true); 561 if (name) 562 return name; 563 564 if (!substitute_name_allowed) 565 return nullptr; 566 567 name = GetAttributeValueAsString(cu, DW_AT_name, nullptr, true); 568 return name; 569} 570 571// GetPubname 572// 573// Get value the name for a DIE as it should appear for a .debug_pubnames or 574// .debug_pubtypes section. 575const char *DWARFDebugInfoEntry::GetPubname(const DWARFUnit *cu) const { 576 const char *name = nullptr; 577 if (!cu) 578 return name; 579 580 name = GetAttributeValueAsString(cu, DW_AT_MIPS_linkage_name, nullptr, true); 581 if (name) 582 return name; 583 584 name = GetAttributeValueAsString(cu, DW_AT_linkage_name, nullptr, true); 585 if (name) 586 return name; 587 588 name = GetAttributeValueAsString(cu, DW_AT_name, nullptr, true); 589 return name; 590} 591 592/// This function is builds a table very similar to the standard .debug_aranges 593/// table, except that the actual DIE offset for the function is placed in the 594/// table instead of the compile unit offset. 595void DWARFDebugInfoEntry::BuildFunctionAddressRangeTable( 596 DWARFUnit *cu, DWARFDebugAranges *debug_aranges) const { 597 if (m_tag) { 598 if (m_tag == DW_TAG_subprogram) { 599 DWARFRangeList ranges = 600 GetAttributeAddressRanges(cu, /*check_hi_lo_pc=*/true); 601 for (const auto &r : ranges) { 602 debug_aranges->AppendRange(GetOffset(), r.GetRangeBase(), 603 r.GetRangeEnd()); 604 } 605 } 606 607 const DWARFDebugInfoEntry *child = GetFirstChild(); 608 while (child) { 609 child->BuildFunctionAddressRangeTable(cu, debug_aranges); 610 child = child->GetSibling(); 611 } 612 } 613} 614 615DWARFDeclContext 616DWARFDebugInfoEntry::GetDWARFDeclContextStatic(const DWARFDebugInfoEntry *die, 617 DWARFUnit *cu) { 618 DWARFDeclContext dwarf_decl_ctx; 619 for (;;) { 620 const dw_tag_t tag = die->Tag(); 621 if (tag == DW_TAG_compile_unit || tag == DW_TAG_partial_unit) 622 return dwarf_decl_ctx; 623 dwarf_decl_ctx.AppendDeclContext(tag, die->GetName(cu)); 624 DWARFDIE parent_decl_ctx_die = die->GetParentDeclContextDIE(cu); 625 if (!parent_decl_ctx_die || parent_decl_ctx_die.GetDIE() == die) 626 return dwarf_decl_ctx; 627 if (parent_decl_ctx_die.Tag() == DW_TAG_compile_unit || 628 parent_decl_ctx_die.Tag() == DW_TAG_partial_unit) 629 return dwarf_decl_ctx; 630 die = parent_decl_ctx_die.GetDIE(); 631 cu = parent_decl_ctx_die.GetCU(); 632 } 633} 634 635DWARFDeclContext DWARFDebugInfoEntry::GetDWARFDeclContext(DWARFUnit *cu) const { 636 return GetDWARFDeclContextStatic(this, cu); 637} 638 639DWARFDIE 640DWARFDebugInfoEntry::GetParentDeclContextDIE(DWARFUnit *cu) const { 641 DWARFAttributes attributes = GetAttributes(cu, Recurse::yes); 642 return GetParentDeclContextDIE(cu, attributes); 643} 644 645DWARFDIE 646DWARFDebugInfoEntry::GetParentDeclContextDIE( 647 DWARFUnit *cu, const DWARFAttributes &attributes) const { 648 DWARFDIE die(cu, const_cast<DWARFDebugInfoEntry *>(this)); 649 650 while (die) { 651 // If this is the original DIE that we are searching for a declaration for, 652 // then don't look in the cache as we don't want our own decl context to be 653 // our decl context... 654 if (die.GetDIE() != this) { 655 switch (die.Tag()) { 656 case DW_TAG_compile_unit: 657 case DW_TAG_partial_unit: 658 case DW_TAG_namespace: 659 case DW_TAG_structure_type: 660 case DW_TAG_union_type: 661 case DW_TAG_class_type: 662 return die; 663 664 default: 665 break; 666 } 667 } 668 669 DWARFDIE spec_die = attributes.FormValueAsReference(DW_AT_specification); 670 if (spec_die) { 671 DWARFDIE decl_ctx_die = spec_die.GetParentDeclContextDIE(); 672 if (decl_ctx_die) 673 return decl_ctx_die; 674 } 675 676 DWARFDIE abs_die = attributes.FormValueAsReference(DW_AT_abstract_origin); 677 if (abs_die) { 678 DWARFDIE decl_ctx_die = abs_die.GetParentDeclContextDIE(); 679 if (decl_ctx_die) 680 return decl_ctx_die; 681 } 682 683 die = die.GetParent(); 684 } 685 return DWARFDIE(); 686} 687 688lldb::offset_t DWARFDebugInfoEntry::GetFirstAttributeOffset() const { 689 return GetOffset() + llvm::getULEB128Size(m_abbr_idx); 690} 691 692const llvm::DWARFAbbreviationDeclaration * 693DWARFDebugInfoEntry::GetAbbreviationDeclarationPtr(const DWARFUnit *cu) const { 694 if (!cu) 695 return nullptr; 696 697 const llvm::DWARFAbbreviationDeclarationSet *abbrev_set = 698 cu->GetAbbreviations(); 699 if (!abbrev_set) 700 return nullptr; 701 702 return abbrev_set->getAbbreviationDeclaration(m_abbr_idx); 703} 704 705bool DWARFDebugInfoEntry::IsGlobalOrStaticScopeVariable() const { 706 if (Tag() != DW_TAG_variable) 707 return false; 708 const DWARFDebugInfoEntry *parent_die = GetParent(); 709 while (parent_die != nullptr) { 710 switch (parent_die->Tag()) { 711 case DW_TAG_subprogram: 712 case DW_TAG_lexical_block: 713 case DW_TAG_inlined_subroutine: 714 return false; 715 716 case DW_TAG_compile_unit: 717 case DW_TAG_partial_unit: 718 return true; 719 720 default: 721 break; 722 } 723 parent_die = parent_die->GetParent(); 724 } 725 return false; 726} 727 728bool DWARFDebugInfoEntry::operator==(const DWARFDebugInfoEntry &rhs) const { 729 return m_offset == rhs.m_offset && m_parent_idx == rhs.m_parent_idx && 730 m_sibling_idx == rhs.m_sibling_idx && 731 m_abbr_idx == rhs.m_abbr_idx && m_has_children == rhs.m_has_children && 732 m_tag == rhs.m_tag; 733} 734 735bool DWARFDebugInfoEntry::operator!=(const DWARFDebugInfoEntry &rhs) const { 736 return !(*this == rhs); 737} 738