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 "DWARFContext.h"
11 #include "DWARFDebugArangeSet.h"
13 #include "llvm/ADT/SmallString.h"
14 #include "llvm/ADT/StringSwitch.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;
24 using std::error_code;
26 #define DEBUG_TYPE "dwarf"
28 typedef DWARFDebugLine::LineTable DWARFLineTable;
29 typedef DILineInfoSpecifier::FileLineInfoKind FileLineInfoKind;
30 typedef DILineInfoSpecifier::FunctionNameKind FunctionNameKind;
32 static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data,
33 bool LittleEndian, bool GnuStyle) {
34 OS << "\n." << Name << " contents:\n";
35 DataExtractor pubNames(Data, LittleEndian, 0);
37 while (pubNames.isValidOffset(offset)) {
38 OS << "length = " << format("0x%08x", pubNames.getU32(&offset));
39 OS << " version = " << format("0x%04x", pubNames.getU16(&offset));
40 OS << " unit_offset = " << format("0x%08x", pubNames.getU32(&offset));
41 OS << " unit_size = " << format("0x%08x", pubNames.getU32(&offset)) << '\n';
43 OS << "Offset Linkage Kind Name\n";
45 OS << "Offset Name\n";
47 while (offset < Data.size()) {
48 uint32_t dieRef = pubNames.getU32(&offset);
51 OS << format("0x%8.8x ", dieRef);
53 PubIndexEntryDescriptor desc(pubNames.getU8(&offset));
54 OS << format("%-8s", dwarf::GDBIndexEntryLinkageString(desc.Linkage))
55 << ' ' << format("%-8s", dwarf::GDBIndexEntryKindString(desc.Kind))
58 OS << '\"' << pubNames.getCStr(&offset) << "\"\n";
63 void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
64 if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
65 OS << ".debug_abbrev contents:\n";
66 getDebugAbbrev()->dump(OS);
69 if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo)
70 if (const DWARFDebugAbbrev *D = getDebugAbbrevDWO()) {
71 OS << "\n.debug_abbrev.dwo contents:\n";
75 if (DumpType == DIDT_All || DumpType == DIDT_Info) {
76 OS << "\n.debug_info contents:\n";
77 for (const auto &CU : compile_units())
81 if ((DumpType == DIDT_All || DumpType == DIDT_InfoDwo) &&
82 getNumDWOCompileUnits()) {
83 OS << "\n.debug_info.dwo contents:\n";
84 for (const auto &DWOCU : dwo_compile_units())
88 if ((DumpType == DIDT_All || DumpType == DIDT_Types) && getNumTypeUnits()) {
89 OS << "\n.debug_types contents:\n";
90 for (const auto &TU : type_units())
94 if ((DumpType == DIDT_All || DumpType == DIDT_TypesDwo) &&
95 getNumDWOTypeUnits()) {
96 OS << "\n.debug_types.dwo contents:\n";
97 for (const auto &DWOTU : dwo_type_units())
101 if (DumpType == DIDT_All || DumpType == DIDT_Loc) {
102 OS << "\n.debug_loc contents:\n";
103 getDebugLoc()->dump(OS);
106 if (DumpType == DIDT_All || DumpType == DIDT_LocDwo) {
107 OS << "\n.debug_loc.dwo contents:\n";
108 getDebugLocDWO()->dump(OS);
111 if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
112 OS << "\n.debug_frame contents:\n";
113 getDebugFrame()->dump(OS);
117 if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
118 OS << "\n.debug_aranges contents:\n";
119 DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
120 DWARFDebugArangeSet set;
121 while (set.extract(arangesData, &offset))
125 uint8_t savedAddressByteSize = 0;
126 if (DumpType == DIDT_All || DumpType == DIDT_Line) {
127 OS << "\n.debug_line contents:\n";
128 for (const auto &CU : compile_units()) {
129 savedAddressByteSize = CU->getAddressByteSize();
130 unsigned stmtOffset =
131 CU->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
132 CU.get(), DW_AT_stmt_list, -1U);
133 if (stmtOffset != -1U) {
134 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
135 savedAddressByteSize);
136 DWARFDebugLine::LineTable LineTable;
137 LineTable.parse(lineData, &getLineSection().Relocs, &stmtOffset);
143 if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
144 OS << "\n.debug_line.dwo contents:\n";
145 unsigned stmtOffset = 0;
146 DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
147 savedAddressByteSize);
148 DWARFDebugLine::LineTable LineTable;
149 while (LineTable.Prologue.parse(lineData, &stmtOffset)) {
155 if (DumpType == DIDT_All || DumpType == DIDT_Str) {
156 OS << "\n.debug_str contents:\n";
157 DataExtractor strData(getStringSection(), isLittleEndian(), 0);
159 uint32_t strOffset = 0;
160 while (const char *s = strData.getCStr(&offset)) {
161 OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
166 if ((DumpType == DIDT_All || DumpType == DIDT_StrDwo) &&
167 !getStringDWOSection().empty()) {
168 OS << "\n.debug_str.dwo contents:\n";
169 DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
171 uint32_t strDWOOffset = 0;
172 while (const char *s = strDWOData.getCStr(&offset)) {
173 OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
174 strDWOOffset = offset;
178 if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
179 OS << "\n.debug_ranges contents:\n";
180 // In fact, different compile units may have different address byte
181 // sizes, but for simplicity we just use the address byte size of the last
182 // compile unit (there is no easy and fast way to associate address range
183 // list and the compile unit it describes).
184 DataExtractor rangesData(getRangeSection(), isLittleEndian(),
185 savedAddressByteSize);
187 DWARFDebugRangeList rangeList;
188 while (rangeList.extract(rangesData, &offset))
192 if (DumpType == DIDT_All || DumpType == DIDT_Pubnames)
193 dumpPubSection(OS, "debug_pubnames", getPubNamesSection(),
194 isLittleEndian(), false);
196 if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes)
197 dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(),
198 isLittleEndian(), false);
200 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames)
201 dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(),
202 isLittleEndian(), true /* GnuStyle */);
204 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes)
205 dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(),
206 isLittleEndian(), true /* GnuStyle */);
208 if ((DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) &&
209 !getStringOffsetDWOSection().empty()) {
210 OS << "\n.debug_str_offsets.dwo contents:\n";
211 DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(),
214 uint64_t size = getStringOffsetDWOSection().size();
215 while (offset < size) {
216 OS << format("0x%8.8x: ", offset);
217 OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
222 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
226 DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
228 Abbrev.reset(new DWARFDebugAbbrev());
229 Abbrev->extract(abbrData);
233 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
235 return AbbrevDWO.get();
237 DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
238 AbbrevDWO.reset(new DWARFDebugAbbrev());
239 AbbrevDWO->extract(abbrData);
240 return AbbrevDWO.get();
243 const DWARFDebugLoc *DWARFContext::getDebugLoc() {
247 DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0);
248 Loc.reset(new DWARFDebugLoc(getLocSection().Relocs));
249 // assume all compile units have the same address byte size
250 if (getNumCompileUnits())
251 Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize());
255 const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
259 DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0);
260 LocDWO.reset(new DWARFDebugLocDWO());
261 LocDWO->parse(LocData);
265 const DWARFDebugAranges *DWARFContext::getDebugAranges() {
267 return Aranges.get();
269 Aranges.reset(new DWARFDebugAranges());
270 Aranges->generate(this);
271 return Aranges.get();
274 const DWARFDebugFrame *DWARFContext::getDebugFrame() {
276 return DebugFrame.get();
278 // There's a "bug" in the DWARFv3 standard with respect to the target address
279 // size within debug frame sections. While DWARF is supposed to be independent
280 // of its container, FDEs have fields with size being "target address size",
281 // which isn't specified in DWARF in general. It's only specified for CUs, but
282 // .eh_frame can appear without a .debug_info section. Follow the example of
283 // other tools (libdwarf) and extract this from the container (ObjectFile
284 // provides this information). This problem is fixed in DWARFv4
285 // See this dwarf-discuss discussion for more details:
286 // http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
287 DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
289 DebugFrame.reset(new DWARFDebugFrame());
290 DebugFrame->parse(debugFrameData);
291 return DebugFrame.get();
294 const DWARFLineTable *
295 DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
297 Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
299 unsigned stmtOffset =
300 cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
301 cu, DW_AT_stmt_list, -1U);
302 if (stmtOffset == -1U)
303 return nullptr; // No line table for this compile unit.
305 // See if the line table is cached.
306 if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
309 // We have to parse it first.
310 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
311 cu->getAddressByteSize());
312 return Line->getOrParseLineTable(lineData, stmtOffset);
315 void DWARFContext::parseCompileUnits() {
319 const DataExtractor &DIData = DataExtractor(getInfoSection().Data,
320 isLittleEndian(), 0);
321 while (DIData.isValidOffset(offset)) {
322 std::unique_ptr<DWARFCompileUnit> CU(new DWARFCompileUnit(
323 getDebugAbbrev(), getInfoSection().Data, getRangeSection(),
324 getStringSection(), StringRef(), getAddrSection(),
325 &getInfoSection().Relocs, isLittleEndian()));
326 if (!CU->extract(DIData, &offset)) {
329 CUs.push_back(std::move(CU));
330 offset = CUs.back()->getNextUnitOffset();
334 void DWARFContext::parseTypeUnits() {
337 for (const auto &I : getTypesSections()) {
339 const DataExtractor &DIData =
340 DataExtractor(I.second.Data, isLittleEndian(), 0);
341 while (DIData.isValidOffset(offset)) {
342 std::unique_ptr<DWARFTypeUnit> TU(
343 new DWARFTypeUnit(getDebugAbbrev(), I.second.Data, getRangeSection(),
344 getStringSection(), StringRef(), getAddrSection(),
345 &I.second.Relocs, isLittleEndian()));
346 if (!TU->extract(DIData, &offset))
348 TUs.push_back(std::move(TU));
349 offset = TUs.back()->getNextUnitOffset();
354 void DWARFContext::parseDWOCompileUnits() {
358 const DataExtractor &DIData =
359 DataExtractor(getInfoDWOSection().Data, isLittleEndian(), 0);
360 while (DIData.isValidOffset(offset)) {
361 std::unique_ptr<DWARFCompileUnit> DWOCU(new DWARFCompileUnit(
362 getDebugAbbrevDWO(), getInfoDWOSection().Data, getRangeDWOSection(),
363 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
364 &getInfoDWOSection().Relocs, isLittleEndian()));
365 if (!DWOCU->extract(DIData, &offset)) {
368 DWOCUs.push_back(std::move(DWOCU));
369 offset = DWOCUs.back()->getNextUnitOffset();
373 void DWARFContext::parseDWOTypeUnits() {
376 for (const auto &I : getTypesDWOSections()) {
378 const DataExtractor &DIData =
379 DataExtractor(I.second.Data, isLittleEndian(), 0);
380 while (DIData.isValidOffset(offset)) {
381 std::unique_ptr<DWARFTypeUnit> TU(new DWARFTypeUnit(
382 getDebugAbbrevDWO(), I.second.Data, getRangeDWOSection(),
383 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
384 &I.second.Relocs, isLittleEndian()));
385 if (!TU->extract(DIData, &offset))
387 DWOTUs.push_back(std::move(TU));
388 offset = DWOTUs.back()->getNextUnitOffset();
394 struct OffsetComparator {
396 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
397 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
398 return LHS->getOffset() < RHS->getOffset();
400 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
401 uint32_t RHS) const {
402 return LHS->getOffset() < RHS;
404 bool operator()(uint32_t LHS,
405 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
406 return LHS < RHS->getOffset();
411 DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
414 std::unique_ptr<DWARFCompileUnit> *CU =
415 std::lower_bound(CUs.begin(), CUs.end(), Offset, OffsetComparator());
416 if (CU != CUs.end()) {
422 DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
423 // First, get the offset of the compile unit.
424 uint32_t CUOffset = getDebugAranges()->findAddress(Address);
425 // Retrieve the compile unit.
426 return getCompileUnitForOffset(CUOffset);
429 static bool getFileNameForCompileUnit(DWARFCompileUnit *CU,
430 const DWARFLineTable *LineTable,
431 uint64_t FileIndex, FileLineInfoKind Kind,
432 std::string &FileName) {
433 if (!CU || !LineTable || Kind == FileLineInfoKind::None ||
434 !LineTable->getFileNameByIndex(FileIndex, Kind, FileName))
436 if (Kind == FileLineInfoKind::AbsoluteFilePath &&
437 sys::path::is_relative(FileName)) {
438 // We may still need to append compilation directory of compile unit.
439 SmallString<16> AbsolutePath;
440 if (const char *CompilationDir = CU->getCompilationDir()) {
441 sys::path::append(AbsolutePath, CompilationDir);
443 sys::path::append(AbsolutePath, FileName);
444 FileName = AbsolutePath.str();
449 static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
450 const DWARFLineTable *LineTable,
452 FileLineInfoKind Kind,
453 DILineInfo &Result) {
454 if (!CU || !LineTable)
456 // Get the index of row we're looking for in the line table.
457 uint32_t RowIndex = LineTable->lookupAddress(Address);
460 // Take file number and line/column from the row.
461 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
462 if (!getFileNameForCompileUnit(CU, LineTable, Row.File, Kind,
465 Result.Line = Row.Line;
466 Result.Column = Row.Column;
470 static bool getFunctionNameForAddress(DWARFCompileUnit *CU, uint64_t Address,
471 FunctionNameKind Kind,
472 std::string &FunctionName) {
473 if (Kind == FunctionNameKind::None)
475 // The address may correspond to instruction in some inlined function,
476 // so we have to build the chain of inlined functions and take the
477 // name of the topmost function in it.
478 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
479 CU->getInlinedChainForAddress(Address);
480 if (InlinedChain.DIEs.size() == 0)
482 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
483 if (const char *Name =
484 TopFunctionDIE.getSubroutineName(InlinedChain.U, Kind)) {
491 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
492 DILineInfoSpecifier Spec) {
495 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
498 getFunctionNameForAddress(CU, Address, Spec.FNKind, Result.FunctionName);
499 if (Spec.FLIKind != FileLineInfoKind::None) {
500 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
501 getFileLineInfoForCompileUnit(CU, LineTable, Address, Spec.FLIKind, Result);
507 DWARFContext::getLineInfoForAddressRange(uint64_t Address, uint64_t Size,
508 DILineInfoSpecifier Spec) {
509 DILineInfoTable Lines;
510 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
514 std::string FunctionName = "<invalid>";
515 getFunctionNameForAddress(CU, Address, Spec.FNKind, FunctionName);
517 // If the Specifier says we don't need FileLineInfo, just
518 // return the top-most function at the starting address.
519 if (Spec.FLIKind == FileLineInfoKind::None) {
521 Result.FunctionName = FunctionName;
522 Lines.push_back(std::make_pair(Address, Result));
526 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
528 // Get the index of row we're looking for in the line table.
529 std::vector<uint32_t> RowVector;
530 if (!LineTable->lookupAddressRange(Address, Size, RowVector))
533 for (uint32_t RowIndex : RowVector) {
534 // Take file number and line/column from the row.
535 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
537 getFileNameForCompileUnit(CU, LineTable, Row.File, Spec.FLIKind,
539 Result.FunctionName = FunctionName;
540 Result.Line = Row.Line;
541 Result.Column = Row.Column;
542 Lines.push_back(std::make_pair(Row.Address, Result));
549 DWARFContext::getInliningInfoForAddress(uint64_t Address,
550 DILineInfoSpecifier Spec) {
551 DIInliningInfo InliningInfo;
553 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
557 const DWARFLineTable *LineTable = nullptr;
558 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
559 CU->getInlinedChainForAddress(Address);
560 if (InlinedChain.DIEs.size() == 0) {
561 // If there is no DIE for address (e.g. it is in unavailable .dwo file),
562 // try to at least get file/line info from symbol table.
563 if (Spec.FLIKind != FileLineInfoKind::None) {
565 LineTable = getLineTableForCompileUnit(CU);
566 if (getFileLineInfoForCompileUnit(CU, LineTable, Address, Spec.FLIKind,
568 InliningInfo.addFrame(Frame);
574 uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
575 for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) {
576 const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i];
578 // Get function name if necessary.
579 if (const char *Name =
580 FunctionDIE.getSubroutineName(InlinedChain.U, Spec.FNKind))
581 Frame.FunctionName = Name;
582 if (Spec.FLIKind != FileLineInfoKind::None) {
584 // For the topmost frame, initialize the line table of this
585 // compile unit and fetch file/line info from it.
586 LineTable = getLineTableForCompileUnit(CU);
587 // For the topmost routine, get file/line info from line table.
588 getFileLineInfoForCompileUnit(CU, LineTable, Address, Spec.FLIKind,
591 // Otherwise, use call file, call line and call column from
592 // previous DIE in inlined chain.
593 getFileNameForCompileUnit(CU, LineTable, CallFile, Spec.FLIKind,
595 Frame.Line = CallLine;
596 Frame.Column = CallColumn;
598 // Get call file/line/column of a current DIE.
600 FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine,
604 InliningInfo.addFrame(Frame);
609 static bool consumeCompressedDebugSectionHeader(StringRef &data,
610 uint64_t &OriginalSize) {
611 // Consume "ZLIB" prefix.
612 if (!data.startswith("ZLIB"))
614 data = data.substr(4);
615 // Consume uncompressed section size (big-endian 8 bytes).
616 DataExtractor extractor(data, false, 8);
618 OriginalSize = extractor.getU64(&Offset);
621 data = data.substr(Offset);
625 DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj)
626 : IsLittleEndian(Obj->isLittleEndian()),
627 AddressSize(Obj->getBytesInAddress()) {
628 for (const SectionRef &Section : Obj->sections()) {
630 Section.getName(name);
632 Section.getContents(data);
634 name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
636 // Check if debug info section is compressed with zlib.
637 if (name.startswith("zdebug_")) {
638 uint64_t OriginalSize;
639 if (!zlib::isAvailable() ||
640 !consumeCompressedDebugSectionHeader(data, OriginalSize))
642 UncompressedSections.resize(UncompressedSections.size() + 1);
643 if (zlib::uncompress(data, UncompressedSections.back(), OriginalSize) !=
645 UncompressedSections.pop_back();
648 // Make data point to uncompressed section contents and save its contents.
649 name = name.substr(1);
650 data = UncompressedSections.back();
653 StringRef *SectionData =
654 StringSwitch<StringRef *>(name)
655 .Case("debug_info", &InfoSection.Data)
656 .Case("debug_abbrev", &AbbrevSection)
657 .Case("debug_loc", &LocSection.Data)
658 .Case("debug_line", &LineSection.Data)
659 .Case("debug_aranges", &ARangeSection)
660 .Case("debug_frame", &DebugFrameSection)
661 .Case("debug_str", &StringSection)
662 .Case("debug_ranges", &RangeSection)
663 .Case("debug_pubnames", &PubNamesSection)
664 .Case("debug_pubtypes", &PubTypesSection)
665 .Case("debug_gnu_pubnames", &GnuPubNamesSection)
666 .Case("debug_gnu_pubtypes", &GnuPubTypesSection)
667 .Case("debug_info.dwo", &InfoDWOSection.Data)
668 .Case("debug_abbrev.dwo", &AbbrevDWOSection)
669 .Case("debug_loc.dwo", &LocDWOSection.Data)
670 .Case("debug_line.dwo", &LineDWOSection.Data)
671 .Case("debug_str.dwo", &StringDWOSection)
672 .Case("debug_str_offsets.dwo", &StringOffsetDWOSection)
673 .Case("debug_addr", &AddrSection)
674 // Any more debug info sections go here.
678 if (name == "debug_ranges") {
679 // FIXME: Use the other dwo range section when we emit it.
680 RangeDWOSection = data;
682 } else if (name == "debug_types") {
683 // Find debug_types data by section rather than name as there are
684 // multiple, comdat grouped, debug_types sections.
685 TypesSections[Section].Data = data;
686 } else if (name == "debug_types.dwo") {
687 TypesDWOSections[Section].Data = data;
690 section_iterator RelocatedSection = Section.getRelocatedSection();
691 if (RelocatedSection == Obj->section_end())
694 StringRef RelSecName;
695 RelocatedSection->getName(RelSecName);
696 RelSecName = RelSecName.substr(
697 RelSecName.find_first_not_of("._")); // Skip . and _ prefixes.
699 // TODO: Add support for relocations in other sections as needed.
700 // Record relocations for the debug_info and debug_line sections.
701 RelocAddrMap *Map = StringSwitch<RelocAddrMap*>(RelSecName)
702 .Case("debug_info", &InfoSection.Relocs)
703 .Case("debug_loc", &LocSection.Relocs)
704 .Case("debug_info.dwo", &InfoDWOSection.Relocs)
705 .Case("debug_line", &LineSection.Relocs)
708 // Find debug_types relocs by section rather than name as there are
709 // multiple, comdat grouped, debug_types sections.
710 if (RelSecName == "debug_types")
711 Map = &TypesSections[*RelocatedSection].Relocs;
712 else if (RelSecName == "debug_types.dwo")
713 Map = &TypesDWOSections[*RelocatedSection].Relocs;
718 if (Section.relocation_begin() != Section.relocation_end()) {
719 uint64_t SectionSize;
720 RelocatedSection->getSize(SectionSize);
721 for (const RelocationRef &Reloc : Section.relocations()) {
723 Reloc.getOffset(Address);
726 uint64_t SymAddr = 0;
727 // ELF relocations may need the symbol address
729 object::symbol_iterator Sym = Reloc.getSymbol();
730 Sym->getAddress(SymAddr);
733 object::RelocVisitor V(Obj->getFileFormatName());
734 // The section address is always 0 for debug sections.
735 object::RelocToApply R(V.visit(Type, Reloc, 0, SymAddr));
737 SmallString<32> Name;
738 error_code ec(Reloc.getTypeName(Name));
740 errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
742 errs() << "error: failed to compute relocation: "
747 if (Address + R.Width > SectionSize) {
748 errs() << "error: " << R.Width << "-byte relocation starting "
749 << Address << " bytes into section " << name << " which is "
750 << SectionSize << " bytes long.\n";
754 errs() << "error: can't handle a relocation of more than 8 bytes at "
758 DEBUG(dbgs() << "Writing " << format("%p", R.Value)
759 << " at " << format("%p", Address)
760 << " with width " << format("%d", R.Width)
762 Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
768 void DWARFContextInMemory::anchor() { }