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;
25 #define DEBUG_TYPE "dwarf"
27 typedef DWARFDebugLine::LineTable DWARFLineTable;
29 static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data,
30 bool LittleEndian, bool GnuStyle) {
31 OS << "\n." << Name << " contents:\n";
32 DataExtractor pubNames(Data, LittleEndian, 0);
34 while (pubNames.isValidOffset(offset)) {
35 OS << "length = " << format("0x%08x", pubNames.getU32(&offset));
36 OS << " version = " << format("0x%04x", pubNames.getU16(&offset));
37 OS << " unit_offset = " << format("0x%08x", pubNames.getU32(&offset));
38 OS << " unit_size = " << format("0x%08x", pubNames.getU32(&offset)) << '\n';
40 OS << "Offset Linkage Kind Name\n";
42 OS << "Offset Name\n";
44 while (offset < Data.size()) {
45 uint32_t dieRef = pubNames.getU32(&offset);
48 OS << format("0x%8.8x ", dieRef);
50 PubIndexEntryDescriptor desc(pubNames.getU8(&offset));
51 OS << format("%-8s", dwarf::GDBIndexEntryLinkageString(desc.Linkage))
52 << ' ' << format("%-8s", dwarf::GDBIndexEntryKindString(desc.Kind))
55 OS << '\"' << pubNames.getCStr(&offset) << "\"\n";
60 void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
61 if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
62 OS << ".debug_abbrev contents:\n";
63 getDebugAbbrev()->dump(OS);
66 if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo)
67 if (const DWARFDebugAbbrev *D = getDebugAbbrevDWO()) {
68 OS << "\n.debug_abbrev.dwo contents:\n";
72 if (DumpType == DIDT_All || DumpType == DIDT_Info) {
73 OS << "\n.debug_info contents:\n";
74 for (const auto &CU : compile_units())
78 if ((DumpType == DIDT_All || DumpType == DIDT_InfoDwo) &&
79 getNumDWOCompileUnits()) {
80 OS << "\n.debug_info.dwo contents:\n";
81 for (const auto &DWOCU : dwo_compile_units())
85 if ((DumpType == DIDT_All || DumpType == DIDT_Types) && getNumTypeUnits()) {
86 OS << "\n.debug_types contents:\n";
87 for (const auto &TU : type_units())
91 if ((DumpType == DIDT_All || DumpType == DIDT_TypesDwo) &&
92 getNumDWOTypeUnits()) {
93 OS << "\n.debug_types.dwo contents:\n";
94 for (const auto &DWOTU : dwo_type_units())
98 if (DumpType == DIDT_All || DumpType == DIDT_Loc) {
99 OS << "\n.debug_loc contents:\n";
100 getDebugLoc()->dump(OS);
103 if (DumpType == DIDT_All || DumpType == DIDT_LocDwo) {
104 OS << "\n.debug_loc.dwo contents:\n";
105 getDebugLocDWO()->dump(OS);
108 if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
109 OS << "\n.debug_frame contents:\n";
110 getDebugFrame()->dump(OS);
114 if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
115 OS << "\n.debug_aranges contents:\n";
116 DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
117 DWARFDebugArangeSet set;
118 while (set.extract(arangesData, &offset))
122 uint8_t savedAddressByteSize = 0;
123 if (DumpType == DIDT_All || DumpType == DIDT_Line) {
124 OS << "\n.debug_line contents:\n";
125 for (const auto &CU : compile_units()) {
126 savedAddressByteSize = CU->getAddressByteSize();
127 unsigned stmtOffset =
128 CU->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
129 CU.get(), DW_AT_stmt_list, -1U);
130 if (stmtOffset != -1U) {
131 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
132 savedAddressByteSize);
133 DWARFDebugLine::DumpingState state(OS);
134 DWARFDebugLine::parseStatementTable(lineData, &getLineSection().Relocs, &stmtOffset, state);
139 if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
140 OS << "\n.debug_line.dwo contents:\n";
141 unsigned stmtOffset = 0;
142 DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
143 savedAddressByteSize);
144 DWARFDebugLine::DumpingState state(OS);
145 while (DWARFDebugLine::parsePrologue(lineData, &stmtOffset, &state.Prologue))
149 if (DumpType == DIDT_All || DumpType == DIDT_Str) {
150 OS << "\n.debug_str contents:\n";
151 DataExtractor strData(getStringSection(), isLittleEndian(), 0);
153 uint32_t strOffset = 0;
154 while (const char *s = strData.getCStr(&offset)) {
155 OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
160 if ((DumpType == DIDT_All || DumpType == DIDT_StrDwo) &&
161 !getStringDWOSection().empty()) {
162 OS << "\n.debug_str.dwo contents:\n";
163 DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
165 uint32_t strDWOOffset = 0;
166 while (const char *s = strDWOData.getCStr(&offset)) {
167 OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
168 strDWOOffset = offset;
172 if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
173 OS << "\n.debug_ranges contents:\n";
174 // In fact, different compile units may have different address byte
175 // sizes, but for simplicity we just use the address byte size of the last
176 // compile unit (there is no easy and fast way to associate address range
177 // list and the compile unit it describes).
178 DataExtractor rangesData(getRangeSection(), isLittleEndian(),
179 savedAddressByteSize);
181 DWARFDebugRangeList rangeList;
182 while (rangeList.extract(rangesData, &offset))
186 if (DumpType == DIDT_All || DumpType == DIDT_Pubnames)
187 dumpPubSection(OS, "debug_pubnames", getPubNamesSection(),
188 isLittleEndian(), false);
190 if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes)
191 dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(),
192 isLittleEndian(), false);
194 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames)
195 dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(),
196 isLittleEndian(), true /* GnuStyle */);
198 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes)
199 dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(),
200 isLittleEndian(), true /* GnuStyle */);
202 if ((DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) &&
203 !getStringOffsetDWOSection().empty()) {
204 OS << "\n.debug_str_offsets.dwo contents:\n";
205 DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(),
208 uint64_t size = getStringOffsetDWOSection().size();
209 while (offset < size) {
210 OS << format("0x%8.8x: ", offset);
211 OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
216 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
220 DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
222 Abbrev.reset(new DWARFDebugAbbrev());
223 Abbrev->extract(abbrData);
227 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
229 return AbbrevDWO.get();
231 DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
232 AbbrevDWO.reset(new DWARFDebugAbbrev());
233 AbbrevDWO->extract(abbrData);
234 return AbbrevDWO.get();
237 const DWARFDebugLoc *DWARFContext::getDebugLoc() {
241 DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0);
242 Loc.reset(new DWARFDebugLoc(getLocSection().Relocs));
243 // assume all compile units have the same address byte size
244 if (getNumCompileUnits())
245 Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize());
249 const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
253 DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0);
254 LocDWO.reset(new DWARFDebugLocDWO());
255 LocDWO->parse(LocData);
259 const DWARFDebugAranges *DWARFContext::getDebugAranges() {
261 return Aranges.get();
263 Aranges.reset(new DWARFDebugAranges());
264 Aranges->generate(this);
265 return Aranges.get();
268 const DWARFDebugFrame *DWARFContext::getDebugFrame() {
270 return DebugFrame.get();
272 // There's a "bug" in the DWARFv3 standard with respect to the target address
273 // size within debug frame sections. While DWARF is supposed to be independent
274 // of its container, FDEs have fields with size being "target address size",
275 // which isn't specified in DWARF in general. It's only specified for CUs, but
276 // .eh_frame can appear without a .debug_info section. Follow the example of
277 // other tools (libdwarf) and extract this from the container (ObjectFile
278 // provides this information). This problem is fixed in DWARFv4
279 // See this dwarf-discuss discussion for more details:
280 // http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
281 DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
283 DebugFrame.reset(new DWARFDebugFrame());
284 DebugFrame->parse(debugFrameData);
285 return DebugFrame.get();
288 const DWARFLineTable *
289 DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
291 Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
293 unsigned stmtOffset =
294 cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
295 cu, DW_AT_stmt_list, -1U);
296 if (stmtOffset == -1U)
297 return nullptr; // No line table for this compile unit.
299 // See if the line table is cached.
300 if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
303 // We have to parse it first.
304 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
305 cu->getAddressByteSize());
306 return Line->getOrParseLineTable(lineData, stmtOffset);
309 void DWARFContext::parseCompileUnits() {
313 const DataExtractor &DIData = DataExtractor(getInfoSection().Data,
314 isLittleEndian(), 0);
315 while (DIData.isValidOffset(offset)) {
316 std::unique_ptr<DWARFCompileUnit> CU(new DWARFCompileUnit(
317 getDebugAbbrev(), getInfoSection().Data, getRangeSection(),
318 getStringSection(), StringRef(), getAddrSection(),
319 &getInfoSection().Relocs, isLittleEndian()));
320 if (!CU->extract(DIData, &offset)) {
323 CUs.push_back(std::move(CU));
324 offset = CUs.back()->getNextUnitOffset();
328 void DWARFContext::parseTypeUnits() {
331 for (const auto &I : getTypesSections()) {
333 const DataExtractor &DIData =
334 DataExtractor(I.second.Data, isLittleEndian(), 0);
335 while (DIData.isValidOffset(offset)) {
336 std::unique_ptr<DWARFTypeUnit> TU(
337 new DWARFTypeUnit(getDebugAbbrev(), I.second.Data, getRangeSection(),
338 getStringSection(), StringRef(), getAddrSection(),
339 &I.second.Relocs, isLittleEndian()));
340 if (!TU->extract(DIData, &offset))
342 TUs.push_back(std::move(TU));
343 offset = TUs.back()->getNextUnitOffset();
348 void DWARFContext::parseDWOCompileUnits() {
352 const DataExtractor &DIData =
353 DataExtractor(getInfoDWOSection().Data, isLittleEndian(), 0);
354 while (DIData.isValidOffset(offset)) {
355 std::unique_ptr<DWARFCompileUnit> DWOCU(new DWARFCompileUnit(
356 getDebugAbbrevDWO(), getInfoDWOSection().Data, getRangeDWOSection(),
357 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
358 &getInfoDWOSection().Relocs, isLittleEndian()));
359 if (!DWOCU->extract(DIData, &offset)) {
362 DWOCUs.push_back(std::move(DWOCU));
363 offset = DWOCUs.back()->getNextUnitOffset();
367 void DWARFContext::parseDWOTypeUnits() {
370 for (const auto &I : getTypesDWOSections()) {
372 const DataExtractor &DIData =
373 DataExtractor(I.second.Data, isLittleEndian(), 0);
374 while (DIData.isValidOffset(offset)) {
375 std::unique_ptr<DWARFTypeUnit> TU(new DWARFTypeUnit(
376 getDebugAbbrevDWO(), I.second.Data, getRangeDWOSection(),
377 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
378 &I.second.Relocs, isLittleEndian()));
379 if (!TU->extract(DIData, &offset))
381 DWOTUs.push_back(std::move(TU));
382 offset = DWOTUs.back()->getNextUnitOffset();
388 struct OffsetComparator {
390 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
391 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
392 return LHS->getOffset() < RHS->getOffset();
394 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
395 uint32_t RHS) const {
396 return LHS->getOffset() < RHS;
398 bool operator()(uint32_t LHS,
399 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
400 return LHS < RHS->getOffset();
405 DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
408 std::unique_ptr<DWARFCompileUnit> *CU =
409 std::lower_bound(CUs.begin(), CUs.end(), Offset, OffsetComparator());
410 if (CU != CUs.end()) {
416 DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
417 // First, get the offset of the compile unit.
418 uint32_t CUOffset = getDebugAranges()->findAddress(Address);
419 // Retrieve the compile unit.
420 return getCompileUnitForOffset(CUOffset);
423 static bool getFileNameForCompileUnit(DWARFCompileUnit *CU,
424 const DWARFLineTable *LineTable,
426 bool NeedsAbsoluteFilePath,
427 std::string &FileName) {
428 if (!CU || !LineTable ||
429 !LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath,
432 if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) {
433 // We may still need to append compilation directory of compile unit.
434 SmallString<16> AbsolutePath;
435 if (const char *CompilationDir = CU->getCompilationDir()) {
436 sys::path::append(AbsolutePath, CompilationDir);
438 sys::path::append(AbsolutePath, FileName);
439 FileName = AbsolutePath.str();
444 static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
445 const DWARFLineTable *LineTable,
447 bool NeedsAbsoluteFilePath,
448 DILineInfo &Result) {
449 if (!CU || !LineTable)
451 // Get the index of row we're looking for in the line table.
452 uint32_t RowIndex = LineTable->lookupAddress(Address);
455 // Take file number and line/column from the row.
456 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
457 if (!getFileNameForCompileUnit(CU, LineTable, Row.File, NeedsAbsoluteFilePath,
460 Result.Line = Row.Line;
461 Result.Column = Row.Column;
465 static bool getFunctionNameForAddress(DWARFCompileUnit *CU, uint64_t Address,
466 std::string &FunctionName) {
467 // The address may correspond to instruction in some inlined function,
468 // so we have to build the chain of inlined functions and take the
469 // name of the topmost function in it.
470 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
471 CU->getInlinedChainForAddress(Address);
472 if (InlinedChain.DIEs.size() == 0)
474 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
475 if (const char *Name = TopFunctionDIE.getSubroutineName(InlinedChain.U)) {
482 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
483 DILineInfoSpecifier Specifier) {
486 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
489 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
490 getFunctionNameForAddress(CU, Address, Result.FunctionName);
492 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
493 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
494 const bool NeedsAbsoluteFilePath =
495 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
496 getFileLineInfoForCompileUnit(CU, LineTable, Address, NeedsAbsoluteFilePath,
502 DILineInfoTable DWARFContext::getLineInfoForAddressRange(uint64_t Address,
504 DILineInfoSpecifier Specifier) {
505 DILineInfoTable Lines;
506 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
510 std::string FunctionName = "<invalid>";
511 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
512 getFunctionNameForAddress(CU, Address, FunctionName);
515 // If the Specifier says we don't need FileLineInfo, just
516 // return the top-most function at the starting address.
517 if (!Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
519 Result.FunctionName = FunctionName;
520 Lines.push_back(std::make_pair(Address, Result));
524 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
525 const bool NeedsAbsoluteFilePath =
526 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
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, NeedsAbsoluteFilePath,
539 Result.FunctionName = FunctionName;
540 Result.Line = Row.Line;
541 Result.Column = Row.Column;
542 Lines.push_back(std::make_pair(Row.Address, Result));
548 DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
549 DILineInfoSpecifier Specifier) {
550 DIInliningInfo InliningInfo;
552 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
556 const DWARFLineTable *LineTable = nullptr;
557 const bool NeedsAbsoluteFilePath =
558 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
559 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
560 CU->getInlinedChainForAddress(Address);
561 if (InlinedChain.DIEs.size() == 0) {
562 // If there is no DIE for address (e.g. it is in unavailable .dwo file),
563 // try to at least get file/line info from symbol table.
564 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
566 LineTable = getLineTableForCompileUnit(CU);
567 if (getFileLineInfoForCompileUnit(CU, LineTable, Address,
568 NeedsAbsoluteFilePath, Frame)) {
569 InliningInfo.addFrame(Frame);
575 uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
576 for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) {
577 const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i];
579 // Get function name if necessary.
580 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
581 if (const char *Name = FunctionDIE.getSubroutineName(InlinedChain.U))
582 Frame.FunctionName = Name;
584 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
586 // For the topmost frame, initialize the line table of this
587 // compile unit and fetch file/line info from it.
588 LineTable = getLineTableForCompileUnit(CU);
589 // For the topmost routine, get file/line info from line table.
590 getFileLineInfoForCompileUnit(CU, LineTable, Address,
591 NeedsAbsoluteFilePath, Frame);
593 // Otherwise, use call file, call line and call column from
594 // previous DIE in inlined chain.
595 getFileNameForCompileUnit(CU, LineTable, CallFile,
596 NeedsAbsoluteFilePath, Frame.FileName);
597 Frame.Line = CallLine;
598 Frame.Column = CallColumn;
600 // Get call file/line/column of a current DIE.
602 FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine,
606 InliningInfo.addFrame(Frame);
611 static bool consumeCompressedDebugSectionHeader(StringRef &data,
612 uint64_t &OriginalSize) {
613 // Consume "ZLIB" prefix.
614 if (!data.startswith("ZLIB"))
616 data = data.substr(4);
617 // Consume uncompressed section size (big-endian 8 bytes).
618 DataExtractor extractor(data, false, 8);
620 OriginalSize = extractor.getU64(&Offset);
623 data = data.substr(Offset);
627 DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj)
628 : IsLittleEndian(Obj->isLittleEndian()),
629 AddressSize(Obj->getBytesInAddress()) {
630 for (const SectionRef &Section : Obj->sections()) {
632 Section.getName(name);
634 Section.getContents(data);
636 name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
638 // Check if debug info section is compressed with zlib.
639 if (name.startswith("zdebug_")) {
640 uint64_t OriginalSize;
641 if (!zlib::isAvailable() ||
642 !consumeCompressedDebugSectionHeader(data, OriginalSize))
644 UncompressedSections.resize(UncompressedSections.size() + 1);
645 if (zlib::uncompress(data, UncompressedSections.back(), OriginalSize) !=
647 UncompressedSections.pop_back();
650 // Make data point to uncompressed section contents and save its contents.
651 name = name.substr(1);
652 data = UncompressedSections.back();
655 StringRef *SectionData =
656 StringSwitch<StringRef *>(name)
657 .Case("debug_info", &InfoSection.Data)
658 .Case("debug_abbrev", &AbbrevSection)
659 .Case("debug_loc", &LocSection.Data)
660 .Case("debug_line", &LineSection.Data)
661 .Case("debug_aranges", &ARangeSection)
662 .Case("debug_frame", &DebugFrameSection)
663 .Case("debug_str", &StringSection)
664 .Case("debug_ranges", &RangeSection)
665 .Case("debug_pubnames", &PubNamesSection)
666 .Case("debug_pubtypes", &PubTypesSection)
667 .Case("debug_gnu_pubnames", &GnuPubNamesSection)
668 .Case("debug_gnu_pubtypes", &GnuPubTypesSection)
669 .Case("debug_info.dwo", &InfoDWOSection.Data)
670 .Case("debug_abbrev.dwo", &AbbrevDWOSection)
671 .Case("debug_loc.dwo", &LocDWOSection.Data)
672 .Case("debug_line.dwo", &LineDWOSection.Data)
673 .Case("debug_str.dwo", &StringDWOSection)
674 .Case("debug_str_offsets.dwo", &StringOffsetDWOSection)
675 .Case("debug_addr", &AddrSection)
676 // Any more debug info sections go here.
680 if (name == "debug_ranges") {
681 // FIXME: Use the other dwo range section when we emit it.
682 RangeDWOSection = data;
684 } else if (name == "debug_types") {
685 // Find debug_types data by section rather than name as there are
686 // multiple, comdat grouped, debug_types sections.
687 TypesSections[Section].Data = data;
688 } else if (name == "debug_types.dwo") {
689 TypesDWOSections[Section].Data = data;
692 section_iterator RelocatedSection = Section.getRelocatedSection();
693 if (RelocatedSection == Obj->section_end())
696 StringRef RelSecName;
697 RelocatedSection->getName(RelSecName);
698 RelSecName = RelSecName.substr(
699 RelSecName.find_first_not_of("._")); // Skip . and _ prefixes.
701 // TODO: Add support for relocations in other sections as needed.
702 // Record relocations for the debug_info and debug_line sections.
703 RelocAddrMap *Map = StringSwitch<RelocAddrMap*>(RelSecName)
704 .Case("debug_info", &InfoSection.Relocs)
705 .Case("debug_loc", &LocSection.Relocs)
706 .Case("debug_info.dwo", &InfoDWOSection.Relocs)
707 .Case("debug_line", &LineSection.Relocs)
710 // Find debug_types relocs by section rather than name as there are
711 // multiple, comdat grouped, debug_types sections.
712 if (RelSecName == "debug_types")
713 Map = &TypesSections[*RelocatedSection].Relocs;
714 else if (RelSecName == "debug_types.dwo")
715 Map = &TypesDWOSections[*RelocatedSection].Relocs;
720 if (Section.relocation_begin() != Section.relocation_end()) {
721 uint64_t SectionSize;
722 RelocatedSection->getSize(SectionSize);
723 for (const RelocationRef &Reloc : Section.relocations()) {
725 Reloc.getOffset(Address);
728 uint64_t SymAddr = 0;
729 // ELF relocations may need the symbol address
731 object::symbol_iterator Sym = Reloc.getSymbol();
732 Sym->getAddress(SymAddr);
735 object::RelocVisitor V(Obj->getFileFormatName());
736 // The section address is always 0 for debug sections.
737 object::RelocToApply R(V.visit(Type, Reloc, 0, SymAddr));
739 SmallString<32> Name;
740 error_code ec(Reloc.getTypeName(Name));
742 errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
744 errs() << "error: failed to compute relocation: "
749 if (Address + R.Width > SectionSize) {
750 errs() << "error: " << R.Width << "-byte relocation starting "
751 << Address << " bytes into section " << name << " which is "
752 << SectionSize << " bytes long.\n";
756 errs() << "error: can't handle a relocation of more than 8 bytes at "
760 DEBUG(dbgs() << "Writing " << format("%p", R.Value)
761 << " at " << format("%p", Address)
762 << " with width " << format("%d", R.Width)
764 Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
770 void DWARFContextInMemory::anchor() { }