1 //===-- DWARFContext.cpp --------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/ADT/StringSwitch.h"
13 #include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
14 #include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
15 #include "llvm/Support/Compression.h"
16 #include "llvm/Support/Dwarf.h"
17 #include "llvm/Support/Format.h"
18 #include "llvm/Support/Path.h"
19 #include "llvm/Support/raw_ostream.h"
22 using namespace dwarf;
23 using namespace object;
25 #define DEBUG_TYPE "dwarf"
27 typedef DWARFDebugLine::LineTable DWARFLineTable;
28 typedef DILineInfoSpecifier::FileLineInfoKind FileLineInfoKind;
29 typedef DILineInfoSpecifier::FunctionNameKind FunctionNameKind;
31 static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data,
32 bool LittleEndian, bool GnuStyle) {
33 OS << "\n." << Name << " contents:\n";
34 DataExtractor pubNames(Data, LittleEndian, 0);
36 while (pubNames.isValidOffset(offset)) {
37 OS << "length = " << format("0x%08x", pubNames.getU32(&offset));
38 OS << " version = " << format("0x%04x", pubNames.getU16(&offset));
39 OS << " unit_offset = " << format("0x%08x", pubNames.getU32(&offset));
40 OS << " unit_size = " << format("0x%08x", pubNames.getU32(&offset)) << '\n';
42 OS << "Offset Linkage Kind Name\n";
44 OS << "Offset Name\n";
46 while (offset < Data.size()) {
47 uint32_t dieRef = pubNames.getU32(&offset);
50 OS << format("0x%8.8x ", dieRef);
52 PubIndexEntryDescriptor desc(pubNames.getU8(&offset));
53 OS << format("%-8s", dwarf::GDBIndexEntryLinkageString(desc.Linkage))
54 << ' ' << format("%-8s", dwarf::GDBIndexEntryKindString(desc.Kind))
57 OS << '\"' << pubNames.getCStr(&offset) << "\"\n";
62 static void dumpAccelSection(raw_ostream &OS, StringRef Name,
63 const DWARFSection& Section, StringRef StringSection,
65 DataExtractor AccelSection(Section.Data, LittleEndian, 0);
66 DataExtractor StrData(StringSection, LittleEndian, 0);
67 OS << "\n." << Name << " contents:\n";
68 DWARFAcceleratorTable Accel(AccelSection, StrData, Section.Relocs);
74 void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
75 if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
76 OS << ".debug_abbrev contents:\n";
77 getDebugAbbrev()->dump(OS);
80 if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo)
81 if (const DWARFDebugAbbrev *D = getDebugAbbrevDWO()) {
82 OS << "\n.debug_abbrev.dwo contents:\n";
86 if (DumpType == DIDT_All || DumpType == DIDT_Info) {
87 OS << "\n.debug_info contents:\n";
88 for (const auto &CU : compile_units())
92 if ((DumpType == DIDT_All || DumpType == DIDT_InfoDwo) &&
93 getNumDWOCompileUnits()) {
94 OS << "\n.debug_info.dwo contents:\n";
95 for (const auto &DWOCU : dwo_compile_units())
99 if ((DumpType == DIDT_All || DumpType == DIDT_Types) && getNumTypeUnits()) {
100 OS << "\n.debug_types contents:\n";
101 for (const auto &TUS : type_unit_sections())
102 for (const auto &TU : TUS)
106 if ((DumpType == DIDT_All || DumpType == DIDT_TypesDwo) &&
107 getNumDWOTypeUnits()) {
108 OS << "\n.debug_types.dwo contents:\n";
109 for (const auto &DWOTUS : dwo_type_unit_sections())
110 for (const auto &DWOTU : DWOTUS)
114 if (DumpType == DIDT_All || DumpType == DIDT_Loc) {
115 OS << "\n.debug_loc contents:\n";
116 getDebugLoc()->dump(OS);
119 if (DumpType == DIDT_All || DumpType == DIDT_LocDwo) {
120 OS << "\n.debug_loc.dwo contents:\n";
121 getDebugLocDWO()->dump(OS);
124 if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
125 OS << "\n.debug_frame contents:\n";
126 getDebugFrame()->dump(OS);
130 if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
131 OS << "\n.debug_aranges contents:\n";
132 DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
133 DWARFDebugArangeSet set;
134 while (set.extract(arangesData, &offset))
138 uint8_t savedAddressByteSize = 0;
139 if (DumpType == DIDT_All || DumpType == DIDT_Line) {
140 OS << "\n.debug_line contents:\n";
141 for (const auto &CU : compile_units()) {
142 savedAddressByteSize = CU->getAddressByteSize();
143 const auto *CUDIE = CU->getUnitDIE();
144 if (CUDIE == nullptr)
146 unsigned stmtOffset = CUDIE->getAttributeValueAsSectionOffset(
147 CU.get(), DW_AT_stmt_list, -1U);
148 if (stmtOffset != -1U) {
149 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
150 savedAddressByteSize);
151 DWARFDebugLine::LineTable LineTable;
152 LineTable.parse(lineData, &getLineSection().Relocs, &stmtOffset);
158 if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
159 OS << "\n.debug_line.dwo contents:\n";
160 unsigned stmtOffset = 0;
161 DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
162 savedAddressByteSize);
163 DWARFDebugLine::LineTable LineTable;
164 while (LineTable.Prologue.parse(lineData, &stmtOffset)) {
170 if (DumpType == DIDT_All || DumpType == DIDT_Str) {
171 OS << "\n.debug_str contents:\n";
172 DataExtractor strData(getStringSection(), isLittleEndian(), 0);
174 uint32_t strOffset = 0;
175 while (const char *s = strData.getCStr(&offset)) {
176 OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
181 if ((DumpType == DIDT_All || DumpType == DIDT_StrDwo) &&
182 !getStringDWOSection().empty()) {
183 OS << "\n.debug_str.dwo contents:\n";
184 DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
186 uint32_t strDWOOffset = 0;
187 while (const char *s = strDWOData.getCStr(&offset)) {
188 OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
189 strDWOOffset = offset;
193 if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
194 OS << "\n.debug_ranges contents:\n";
195 // In fact, different compile units may have different address byte
196 // sizes, but for simplicity we just use the address byte size of the last
197 // compile unit (there is no easy and fast way to associate address range
198 // list and the compile unit it describes).
199 DataExtractor rangesData(getRangeSection(), isLittleEndian(),
200 savedAddressByteSize);
202 DWARFDebugRangeList rangeList;
203 while (rangeList.extract(rangesData, &offset))
207 if (DumpType == DIDT_All || DumpType == DIDT_Pubnames)
208 dumpPubSection(OS, "debug_pubnames", getPubNamesSection(),
209 isLittleEndian(), false);
211 if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes)
212 dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(),
213 isLittleEndian(), false);
215 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames)
216 dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(),
217 isLittleEndian(), true /* GnuStyle */);
219 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes)
220 dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(),
221 isLittleEndian(), true /* GnuStyle */);
223 if ((DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) &&
224 !getStringOffsetDWOSection().empty()) {
225 OS << "\n.debug_str_offsets.dwo contents:\n";
226 DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(),
229 uint64_t size = getStringOffsetDWOSection().size();
230 while (offset < size) {
231 OS << format("0x%8.8x: ", offset);
232 OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
236 if (DumpType == DIDT_All || DumpType == DIDT_AppleNames)
237 dumpAccelSection(OS, "apple_names", getAppleNamesSection(),
238 getStringSection(), isLittleEndian());
240 if (DumpType == DIDT_All || DumpType == DIDT_AppleTypes)
241 dumpAccelSection(OS, "apple_types", getAppleTypesSection(),
242 getStringSection(), isLittleEndian());
244 if (DumpType == DIDT_All || DumpType == DIDT_AppleNamespaces)
245 dumpAccelSection(OS, "apple_namespaces", getAppleNamespacesSection(),
246 getStringSection(), isLittleEndian());
248 if (DumpType == DIDT_All || DumpType == DIDT_AppleObjC)
249 dumpAccelSection(OS, "apple_objc", getAppleObjCSection(),
250 getStringSection(), isLittleEndian());
253 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
257 DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
259 Abbrev.reset(new DWARFDebugAbbrev());
260 Abbrev->extract(abbrData);
264 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
266 return AbbrevDWO.get();
268 DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
269 AbbrevDWO.reset(new DWARFDebugAbbrev());
270 AbbrevDWO->extract(abbrData);
271 return AbbrevDWO.get();
274 const DWARFDebugLoc *DWARFContext::getDebugLoc() {
278 DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0);
279 Loc.reset(new DWARFDebugLoc(getLocSection().Relocs));
280 // assume all compile units have the same address byte size
281 if (getNumCompileUnits())
282 Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize());
286 const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
290 DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0);
291 LocDWO.reset(new DWARFDebugLocDWO());
292 LocDWO->parse(LocData);
296 const DWARFDebugAranges *DWARFContext::getDebugAranges() {
298 return Aranges.get();
300 Aranges.reset(new DWARFDebugAranges());
301 Aranges->generate(this);
302 return Aranges.get();
305 const DWARFDebugFrame *DWARFContext::getDebugFrame() {
307 return DebugFrame.get();
309 // There's a "bug" in the DWARFv3 standard with respect to the target address
310 // size within debug frame sections. While DWARF is supposed to be independent
311 // of its container, FDEs have fields with size being "target address size",
312 // which isn't specified in DWARF in general. It's only specified for CUs, but
313 // .eh_frame can appear without a .debug_info section. Follow the example of
314 // other tools (libdwarf) and extract this from the container (ObjectFile
315 // provides this information). This problem is fixed in DWARFv4
316 // See this dwarf-discuss discussion for more details:
317 // http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
318 DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
320 DebugFrame.reset(new DWARFDebugFrame());
321 DebugFrame->parse(debugFrameData);
322 return DebugFrame.get();
325 const DWARFLineTable *
326 DWARFContext::getLineTableForUnit(DWARFUnit *U) {
328 Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
329 const auto *UnitDIE = U->getUnitDIE();
330 if (UnitDIE == nullptr)
332 unsigned stmtOffset =
333 UnitDIE->getAttributeValueAsSectionOffset(U, DW_AT_stmt_list, -1U);
334 if (stmtOffset == -1U)
335 return nullptr; // No line table for this compile unit.
337 // See if the line table is cached.
338 if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
341 // We have to parse it first.
342 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
343 U->getAddressByteSize());
344 return Line->getOrParseLineTable(lineData, stmtOffset);
347 void DWARFContext::parseCompileUnits() {
348 CUs.parse(*this, getInfoSection());
351 void DWARFContext::parseTypeUnits() {
354 for (const auto &I : getTypesSections()) {
356 TUs.back().parse(*this, I.second);
360 void DWARFContext::parseDWOCompileUnits() {
361 DWOCUs.parseDWO(*this, getInfoDWOSection());
364 void DWARFContext::parseDWOTypeUnits() {
367 for (const auto &I : getTypesDWOSections()) {
368 DWOTUs.emplace_back();
369 DWOTUs.back().parseDWO(*this, I.second);
373 DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
375 return CUs.getUnitForOffset(Offset);
378 DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
379 // First, get the offset of the compile unit.
380 uint32_t CUOffset = getDebugAranges()->findAddress(Address);
381 // Retrieve the compile unit.
382 return getCompileUnitForOffset(CUOffset);
385 static bool getFunctionNameForAddress(DWARFCompileUnit *CU, uint64_t Address,
386 FunctionNameKind Kind,
387 std::string &FunctionName) {
388 if (Kind == FunctionNameKind::None)
390 // The address may correspond to instruction in some inlined function,
391 // so we have to build the chain of inlined functions and take the
392 // name of the topmost function in it.
393 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
394 CU->getInlinedChainForAddress(Address);
395 if (InlinedChain.DIEs.size() == 0)
397 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
398 if (const char *Name =
399 TopFunctionDIE.getSubroutineName(InlinedChain.U, Kind)) {
406 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
407 DILineInfoSpecifier Spec) {
410 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
413 getFunctionNameForAddress(CU, Address, Spec.FNKind, Result.FunctionName);
414 if (Spec.FLIKind != FileLineInfoKind::None) {
415 if (const DWARFLineTable *LineTable = getLineTableForUnit(CU))
416 LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(),
417 Spec.FLIKind, Result);
423 DWARFContext::getLineInfoForAddressRange(uint64_t Address, uint64_t Size,
424 DILineInfoSpecifier Spec) {
425 DILineInfoTable Lines;
426 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
430 std::string FunctionName = "<invalid>";
431 getFunctionNameForAddress(CU, Address, Spec.FNKind, FunctionName);
433 // If the Specifier says we don't need FileLineInfo, just
434 // return the top-most function at the starting address.
435 if (Spec.FLIKind == FileLineInfoKind::None) {
437 Result.FunctionName = FunctionName;
438 Lines.push_back(std::make_pair(Address, Result));
442 const DWARFLineTable *LineTable = getLineTableForUnit(CU);
444 // Get the index of row we're looking for in the line table.
445 std::vector<uint32_t> RowVector;
446 if (!LineTable->lookupAddressRange(Address, Size, RowVector))
449 for (uint32_t RowIndex : RowVector) {
450 // Take file number and line/column from the row.
451 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
453 LineTable->getFileNameByIndex(Row.File, CU->getCompilationDir(),
454 Spec.FLIKind, Result.FileName);
455 Result.FunctionName = FunctionName;
456 Result.Line = Row.Line;
457 Result.Column = Row.Column;
458 Lines.push_back(std::make_pair(Row.Address, Result));
465 DWARFContext::getInliningInfoForAddress(uint64_t Address,
466 DILineInfoSpecifier Spec) {
467 DIInliningInfo InliningInfo;
469 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
473 const DWARFLineTable *LineTable = nullptr;
474 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
475 CU->getInlinedChainForAddress(Address);
476 if (InlinedChain.DIEs.size() == 0) {
477 // If there is no DIE for address (e.g. it is in unavailable .dwo file),
478 // try to at least get file/line info from symbol table.
479 if (Spec.FLIKind != FileLineInfoKind::None) {
481 LineTable = getLineTableForUnit(CU);
483 LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(),
484 Spec.FLIKind, Frame))
485 InliningInfo.addFrame(Frame);
490 uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
491 for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) {
492 const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i];
494 // Get function name if necessary.
495 if (const char *Name =
496 FunctionDIE.getSubroutineName(InlinedChain.U, Spec.FNKind))
497 Frame.FunctionName = Name;
498 if (Spec.FLIKind != FileLineInfoKind::None) {
500 // For the topmost frame, initialize the line table of this
501 // compile unit and fetch file/line info from it.
502 LineTable = getLineTableForUnit(CU);
503 // For the topmost routine, get file/line info from line table.
505 LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(),
506 Spec.FLIKind, Frame);
508 // Otherwise, use call file, call line and call column from
509 // previous DIE in inlined chain.
511 LineTable->getFileNameByIndex(CallFile, CU->getCompilationDir(),
512 Spec.FLIKind, Frame.FileName);
513 Frame.Line = CallLine;
514 Frame.Column = CallColumn;
516 // Get call file/line/column of a current DIE.
518 FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine,
522 InliningInfo.addFrame(Frame);
527 static bool consumeCompressedDebugSectionHeader(StringRef &data,
528 uint64_t &OriginalSize) {
529 // Consume "ZLIB" prefix.
530 if (!data.startswith("ZLIB"))
532 data = data.substr(4);
533 // Consume uncompressed section size (big-endian 8 bytes).
534 DataExtractor extractor(data, false, 8);
536 OriginalSize = extractor.getU64(&Offset);
539 data = data.substr(Offset);
543 DWARFContextInMemory::DWARFContextInMemory(const object::ObjectFile &Obj,
544 const LoadedObjectInfo *L)
545 : IsLittleEndian(Obj.isLittleEndian()),
546 AddressSize(Obj.getBytesInAddress()) {
547 for (const SectionRef &Section : Obj.sections()) {
549 Section.getName(name);
550 // Skip BSS and Virtual sections, they aren't interesting.
551 bool IsBSS = Section.isBSS();
554 bool IsVirtual = Section.isVirtual();
559 // Try to obtain an already relocated version of this section.
560 // Else use the unrelocated section from the object file. We'll have to
561 // apply relocations ourselves later.
562 if (!L || !L->getLoadedSectionContents(name,data))
563 Section.getContents(data);
565 name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
567 // Check if debug info section is compressed with zlib.
568 if (name.startswith("zdebug_")) {
569 uint64_t OriginalSize;
570 if (!zlib::isAvailable() ||
571 !consumeCompressedDebugSectionHeader(data, OriginalSize))
573 UncompressedSections.resize(UncompressedSections.size() + 1);
574 if (zlib::uncompress(data, UncompressedSections.back(), OriginalSize) !=
576 UncompressedSections.pop_back();
579 // Make data point to uncompressed section contents and save its contents.
580 name = name.substr(1);
581 data = UncompressedSections.back();
584 StringRef *SectionData =
585 StringSwitch<StringRef *>(name)
586 .Case("debug_info", &InfoSection.Data)
587 .Case("debug_abbrev", &AbbrevSection)
588 .Case("debug_loc", &LocSection.Data)
589 .Case("debug_line", &LineSection.Data)
590 .Case("debug_aranges", &ARangeSection)
591 .Case("debug_frame", &DebugFrameSection)
592 .Case("debug_str", &StringSection)
593 .Case("debug_ranges", &RangeSection)
594 .Case("debug_pubnames", &PubNamesSection)
595 .Case("debug_pubtypes", &PubTypesSection)
596 .Case("debug_gnu_pubnames", &GnuPubNamesSection)
597 .Case("debug_gnu_pubtypes", &GnuPubTypesSection)
598 .Case("debug_info.dwo", &InfoDWOSection.Data)
599 .Case("debug_abbrev.dwo", &AbbrevDWOSection)
600 .Case("debug_loc.dwo", &LocDWOSection.Data)
601 .Case("debug_line.dwo", &LineDWOSection.Data)
602 .Case("debug_str.dwo", &StringDWOSection)
603 .Case("debug_str_offsets.dwo", &StringOffsetDWOSection)
604 .Case("debug_addr", &AddrSection)
605 .Case("apple_names", &AppleNamesSection.Data)
606 .Case("apple_types", &AppleTypesSection.Data)
607 .Case("apple_namespaces", &AppleNamespacesSection.Data)
608 .Case("apple_namespac", &AppleNamespacesSection.Data)
609 .Case("apple_objc", &AppleObjCSection.Data)
610 // Any more debug info sections go here.
614 if (name == "debug_ranges") {
615 // FIXME: Use the other dwo range section when we emit it.
616 RangeDWOSection = data;
618 } else if (name == "debug_types") {
619 // Find debug_types data by section rather than name as there are
620 // multiple, comdat grouped, debug_types sections.
621 TypesSections[Section].Data = data;
622 } else if (name == "debug_types.dwo") {
623 TypesDWOSections[Section].Data = data;
626 section_iterator RelocatedSection = Section.getRelocatedSection();
627 if (RelocatedSection == Obj.section_end())
630 StringRef RelSecName;
631 StringRef RelSecData;
632 RelocatedSection->getName(RelSecName);
634 // If the section we're relocating was relocated already by the JIT,
635 // then we used the relocated version above, so we do not need to process
636 // relocations for it now.
637 if (L && L->getLoadedSectionContents(RelSecName,RelSecData))
640 RelSecName = RelSecName.substr(
641 RelSecName.find_first_not_of("._")); // Skip . and _ prefixes.
643 // TODO: Add support for relocations in other sections as needed.
644 // Record relocations for the debug_info and debug_line sections.
645 RelocAddrMap *Map = StringSwitch<RelocAddrMap*>(RelSecName)
646 .Case("debug_info", &InfoSection.Relocs)
647 .Case("debug_loc", &LocSection.Relocs)
648 .Case("debug_info.dwo", &InfoDWOSection.Relocs)
649 .Case("debug_line", &LineSection.Relocs)
650 .Case("apple_names", &AppleNamesSection.Relocs)
651 .Case("apple_types", &AppleTypesSection.Relocs)
652 .Case("apple_namespaces", &AppleNamespacesSection.Relocs)
653 .Case("apple_namespac", &AppleNamespacesSection.Relocs)
654 .Case("apple_objc", &AppleObjCSection.Relocs)
657 // Find debug_types relocs by section rather than name as there are
658 // multiple, comdat grouped, debug_types sections.
659 if (RelSecName == "debug_types")
660 Map = &TypesSections[*RelocatedSection].Relocs;
661 else if (RelSecName == "debug_types.dwo")
662 Map = &TypesDWOSections[*RelocatedSection].Relocs;
667 if (Section.relocation_begin() != Section.relocation_end()) {
668 uint64_t SectionSize = RelocatedSection->getSize();
669 for (const RelocationRef &Reloc : Section.relocations()) {
671 Reloc.getOffset(Address);
674 uint64_t SymAddr = 0;
675 uint64_t SectionLoadAddress = 0;
676 object::symbol_iterator Sym = Reloc.getSymbol();
677 object::section_iterator RSec = Obj.section_end();
679 // First calculate the address of the symbol or section as it appears
681 if (Sym != Obj.symbol_end()) {
682 Sym->getAddress(SymAddr);
683 // Also remember what section this symbol is in for later
684 Sym->getSection(RSec);
685 } else if (auto *MObj = dyn_cast<MachOObjectFile>(&Obj)) {
686 // MachO also has relocations that point to sections and
687 // scattered relocations.
688 // FIXME: We are not handling scattered relocations, do we have to?
689 RSec = MObj->getRelocationSection(Reloc.getRawDataRefImpl());
690 SymAddr = RSec->getAddress();
693 // If we are given load addresses for the sections, we need to adjust:
694 // SymAddr = (Address of Symbol Or Section in File) -
695 // (Address of Section in File) +
696 // (Load Address of Section)
697 if (L != nullptr && RSec != Obj.section_end()) {
698 // RSec is now either the section being targetted or the section
699 // containing the symbol being targetted. In either case,
700 // we need to perform the same computation.
702 RSec->getName(SecName);
703 SectionLoadAddress = L->getSectionLoadAddress(SecName);
704 if (SectionLoadAddress != 0)
705 SymAddr += SectionLoadAddress - RSec->getAddress();
708 object::RelocVisitor V(Obj);
709 object::RelocToApply R(V.visit(Type, Reloc, SymAddr));
711 SmallString<32> Name;
712 std::error_code ec(Reloc.getTypeName(Name));
714 errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
716 errs() << "error: failed to compute relocation: "
721 if (Address + R.Width > SectionSize) {
722 errs() << "error: " << R.Width << "-byte relocation starting "
723 << Address << " bytes into section " << name << " which is "
724 << SectionSize << " bytes long.\n";
728 errs() << "error: can't handle a relocation of more than 8 bytes at "
732 DEBUG(dbgs() << "Writing " << format("%p", R.Value)
733 << " at " << format("%p", Address)
734 << " with width " << format("%d", R.Width)
736 Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
742 void DWARFContextInMemory::anchor() { }