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::LineTable LineTable;
134 LineTable.parse(lineData, &getLineSection().Relocs, &stmtOffset);
140 if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
141 OS << "\n.debug_line.dwo contents:\n";
142 unsigned stmtOffset = 0;
143 DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
144 savedAddressByteSize);
145 DWARFDebugLine::LineTable LineTable;
146 while (LineTable.Prologue.parse(lineData, &stmtOffset)) {
152 if (DumpType == DIDT_All || DumpType == DIDT_Str) {
153 OS << "\n.debug_str contents:\n";
154 DataExtractor strData(getStringSection(), isLittleEndian(), 0);
156 uint32_t strOffset = 0;
157 while (const char *s = strData.getCStr(&offset)) {
158 OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
163 if ((DumpType == DIDT_All || DumpType == DIDT_StrDwo) &&
164 !getStringDWOSection().empty()) {
165 OS << "\n.debug_str.dwo contents:\n";
166 DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
168 uint32_t strDWOOffset = 0;
169 while (const char *s = strDWOData.getCStr(&offset)) {
170 OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
171 strDWOOffset = offset;
175 if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
176 OS << "\n.debug_ranges contents:\n";
177 // In fact, different compile units may have different address byte
178 // sizes, but for simplicity we just use the address byte size of the last
179 // compile unit (there is no easy and fast way to associate address range
180 // list and the compile unit it describes).
181 DataExtractor rangesData(getRangeSection(), isLittleEndian(),
182 savedAddressByteSize);
184 DWARFDebugRangeList rangeList;
185 while (rangeList.extract(rangesData, &offset))
189 if (DumpType == DIDT_All || DumpType == DIDT_Pubnames)
190 dumpPubSection(OS, "debug_pubnames", getPubNamesSection(),
191 isLittleEndian(), false);
193 if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes)
194 dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(),
195 isLittleEndian(), false);
197 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames)
198 dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(),
199 isLittleEndian(), true /* GnuStyle */);
201 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes)
202 dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(),
203 isLittleEndian(), true /* GnuStyle */);
205 if ((DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) &&
206 !getStringOffsetDWOSection().empty()) {
207 OS << "\n.debug_str_offsets.dwo contents:\n";
208 DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(),
211 uint64_t size = getStringOffsetDWOSection().size();
212 while (offset < size) {
213 OS << format("0x%8.8x: ", offset);
214 OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
219 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
223 DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
225 Abbrev.reset(new DWARFDebugAbbrev());
226 Abbrev->extract(abbrData);
230 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
232 return AbbrevDWO.get();
234 DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
235 AbbrevDWO.reset(new DWARFDebugAbbrev());
236 AbbrevDWO->extract(abbrData);
237 return AbbrevDWO.get();
240 const DWARFDebugLoc *DWARFContext::getDebugLoc() {
244 DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0);
245 Loc.reset(new DWARFDebugLoc(getLocSection().Relocs));
246 // assume all compile units have the same address byte size
247 if (getNumCompileUnits())
248 Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize());
252 const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
256 DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0);
257 LocDWO.reset(new DWARFDebugLocDWO());
258 LocDWO->parse(LocData);
262 const DWARFDebugAranges *DWARFContext::getDebugAranges() {
264 return Aranges.get();
266 Aranges.reset(new DWARFDebugAranges());
267 Aranges->generate(this);
268 return Aranges.get();
271 const DWARFDebugFrame *DWARFContext::getDebugFrame() {
273 return DebugFrame.get();
275 // There's a "bug" in the DWARFv3 standard with respect to the target address
276 // size within debug frame sections. While DWARF is supposed to be independent
277 // of its container, FDEs have fields with size being "target address size",
278 // which isn't specified in DWARF in general. It's only specified for CUs, but
279 // .eh_frame can appear without a .debug_info section. Follow the example of
280 // other tools (libdwarf) and extract this from the container (ObjectFile
281 // provides this information). This problem is fixed in DWARFv4
282 // See this dwarf-discuss discussion for more details:
283 // http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
284 DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
286 DebugFrame.reset(new DWARFDebugFrame());
287 DebugFrame->parse(debugFrameData);
288 return DebugFrame.get();
291 const DWARFLineTable *
292 DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
294 Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
296 unsigned stmtOffset =
297 cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
298 cu, DW_AT_stmt_list, -1U);
299 if (stmtOffset == -1U)
300 return nullptr; // No line table for this compile unit.
302 // See if the line table is cached.
303 if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
306 // We have to parse it first.
307 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
308 cu->getAddressByteSize());
309 return Line->getOrParseLineTable(lineData, stmtOffset);
312 void DWARFContext::parseCompileUnits() {
316 const DataExtractor &DIData = DataExtractor(getInfoSection().Data,
317 isLittleEndian(), 0);
318 while (DIData.isValidOffset(offset)) {
319 std::unique_ptr<DWARFCompileUnit> CU(new DWARFCompileUnit(
320 getDebugAbbrev(), getInfoSection().Data, getRangeSection(),
321 getStringSection(), StringRef(), getAddrSection(),
322 &getInfoSection().Relocs, isLittleEndian()));
323 if (!CU->extract(DIData, &offset)) {
326 CUs.push_back(std::move(CU));
327 offset = CUs.back()->getNextUnitOffset();
331 void DWARFContext::parseTypeUnits() {
334 for (const auto &I : getTypesSections()) {
336 const DataExtractor &DIData =
337 DataExtractor(I.second.Data, isLittleEndian(), 0);
338 while (DIData.isValidOffset(offset)) {
339 std::unique_ptr<DWARFTypeUnit> TU(
340 new DWARFTypeUnit(getDebugAbbrev(), I.second.Data, getRangeSection(),
341 getStringSection(), StringRef(), getAddrSection(),
342 &I.second.Relocs, isLittleEndian()));
343 if (!TU->extract(DIData, &offset))
345 TUs.push_back(std::move(TU));
346 offset = TUs.back()->getNextUnitOffset();
351 void DWARFContext::parseDWOCompileUnits() {
355 const DataExtractor &DIData =
356 DataExtractor(getInfoDWOSection().Data, isLittleEndian(), 0);
357 while (DIData.isValidOffset(offset)) {
358 std::unique_ptr<DWARFCompileUnit> DWOCU(new DWARFCompileUnit(
359 getDebugAbbrevDWO(), getInfoDWOSection().Data, getRangeDWOSection(),
360 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
361 &getInfoDWOSection().Relocs, isLittleEndian()));
362 if (!DWOCU->extract(DIData, &offset)) {
365 DWOCUs.push_back(std::move(DWOCU));
366 offset = DWOCUs.back()->getNextUnitOffset();
370 void DWARFContext::parseDWOTypeUnits() {
373 for (const auto &I : getTypesDWOSections()) {
375 const DataExtractor &DIData =
376 DataExtractor(I.second.Data, isLittleEndian(), 0);
377 while (DIData.isValidOffset(offset)) {
378 std::unique_ptr<DWARFTypeUnit> TU(new DWARFTypeUnit(
379 getDebugAbbrevDWO(), I.second.Data, getRangeDWOSection(),
380 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
381 &I.second.Relocs, isLittleEndian()));
382 if (!TU->extract(DIData, &offset))
384 DWOTUs.push_back(std::move(TU));
385 offset = DWOTUs.back()->getNextUnitOffset();
391 struct OffsetComparator {
393 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
394 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
395 return LHS->getOffset() < RHS->getOffset();
397 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
398 uint32_t RHS) const {
399 return LHS->getOffset() < RHS;
401 bool operator()(uint32_t LHS,
402 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
403 return LHS < RHS->getOffset();
408 DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
411 std::unique_ptr<DWARFCompileUnit> *CU =
412 std::lower_bound(CUs.begin(), CUs.end(), Offset, OffsetComparator());
413 if (CU != CUs.end()) {
419 DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
420 // First, get the offset of the compile unit.
421 uint32_t CUOffset = getDebugAranges()->findAddress(Address);
422 // Retrieve the compile unit.
423 return getCompileUnitForOffset(CUOffset);
426 static bool getFileNameForCompileUnit(DWARFCompileUnit *CU,
427 const DWARFLineTable *LineTable,
429 bool NeedsAbsoluteFilePath,
430 std::string &FileName) {
431 if (!CU || !LineTable ||
432 !LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath,
435 if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) {
436 // We may still need to append compilation directory of compile unit.
437 SmallString<16> AbsolutePath;
438 if (const char *CompilationDir = CU->getCompilationDir()) {
439 sys::path::append(AbsolutePath, CompilationDir);
441 sys::path::append(AbsolutePath, FileName);
442 FileName = AbsolutePath.str();
447 static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
448 const DWARFLineTable *LineTable,
450 bool NeedsAbsoluteFilePath,
451 DILineInfo &Result) {
452 if (!CU || !LineTable)
454 // Get the index of row we're looking for in the line table.
455 uint32_t RowIndex = LineTable->lookupAddress(Address);
458 // Take file number and line/column from the row.
459 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
460 if (!getFileNameForCompileUnit(CU, LineTable, Row.File, NeedsAbsoluteFilePath,
463 Result.Line = Row.Line;
464 Result.Column = Row.Column;
468 static bool getFunctionNameForAddress(DWARFCompileUnit *CU, uint64_t Address,
469 std::string &FunctionName) {
470 // The address may correspond to instruction in some inlined function,
471 // so we have to build the chain of inlined functions and take the
472 // name of the topmost function in it.
473 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
474 CU->getInlinedChainForAddress(Address);
475 if (InlinedChain.DIEs.size() == 0)
477 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
478 if (const char *Name = TopFunctionDIE.getSubroutineName(InlinedChain.U)) {
485 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
486 DILineInfoSpecifier Specifier) {
489 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
492 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
493 getFunctionNameForAddress(CU, Address, Result.FunctionName);
495 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
496 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
497 const bool NeedsAbsoluteFilePath =
498 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
499 getFileLineInfoForCompileUnit(CU, LineTable, Address, NeedsAbsoluteFilePath,
505 DILineInfoTable DWARFContext::getLineInfoForAddressRange(uint64_t Address,
507 DILineInfoSpecifier Specifier) {
508 DILineInfoTable Lines;
509 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
513 std::string FunctionName = "<invalid>";
514 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
515 getFunctionNameForAddress(CU, Address, FunctionName);
518 // If the Specifier says we don't need FileLineInfo, just
519 // return the top-most function at the starting address.
520 if (!Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
522 Result.FunctionName = FunctionName;
523 Lines.push_back(std::make_pair(Address, Result));
527 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
528 const bool NeedsAbsoluteFilePath =
529 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
531 // Get the index of row we're looking for in the line table.
532 std::vector<uint32_t> RowVector;
533 if (!LineTable->lookupAddressRange(Address, Size, RowVector))
536 for (uint32_t RowIndex : RowVector) {
537 // Take file number and line/column from the row.
538 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
540 getFileNameForCompileUnit(CU, LineTable, Row.File, NeedsAbsoluteFilePath,
542 Result.FunctionName = FunctionName;
543 Result.Line = Row.Line;
544 Result.Column = Row.Column;
545 Lines.push_back(std::make_pair(Row.Address, Result));
551 DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
552 DILineInfoSpecifier Specifier) {
553 DIInliningInfo InliningInfo;
555 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
559 const DWARFLineTable *LineTable = nullptr;
560 const bool NeedsAbsoluteFilePath =
561 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
562 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
563 CU->getInlinedChainForAddress(Address);
564 if (InlinedChain.DIEs.size() == 0) {
565 // If there is no DIE for address (e.g. it is in unavailable .dwo file),
566 // try to at least get file/line info from symbol table.
567 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
569 LineTable = getLineTableForCompileUnit(CU);
570 if (getFileLineInfoForCompileUnit(CU, LineTable, Address,
571 NeedsAbsoluteFilePath, Frame)) {
572 InliningInfo.addFrame(Frame);
578 uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
579 for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) {
580 const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i];
582 // Get function name if necessary.
583 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
584 if (const char *Name = FunctionDIE.getSubroutineName(InlinedChain.U))
585 Frame.FunctionName = Name;
587 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
589 // For the topmost frame, initialize the line table of this
590 // compile unit and fetch file/line info from it.
591 LineTable = getLineTableForCompileUnit(CU);
592 // For the topmost routine, get file/line info from line table.
593 getFileLineInfoForCompileUnit(CU, LineTable, Address,
594 NeedsAbsoluteFilePath, Frame);
596 // Otherwise, use call file, call line and call column from
597 // previous DIE in inlined chain.
598 getFileNameForCompileUnit(CU, LineTable, CallFile,
599 NeedsAbsoluteFilePath, Frame.FileName);
600 Frame.Line = CallLine;
601 Frame.Column = CallColumn;
603 // Get call file/line/column of a current DIE.
605 FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine,
609 InliningInfo.addFrame(Frame);
614 static bool consumeCompressedDebugSectionHeader(StringRef &data,
615 uint64_t &OriginalSize) {
616 // Consume "ZLIB" prefix.
617 if (!data.startswith("ZLIB"))
619 data = data.substr(4);
620 // Consume uncompressed section size (big-endian 8 bytes).
621 DataExtractor extractor(data, false, 8);
623 OriginalSize = extractor.getU64(&Offset);
626 data = data.substr(Offset);
630 DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj)
631 : IsLittleEndian(Obj->isLittleEndian()),
632 AddressSize(Obj->getBytesInAddress()) {
633 for (const SectionRef &Section : Obj->sections()) {
635 Section.getName(name);
637 Section.getContents(data);
639 name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
641 // Check if debug info section is compressed with zlib.
642 if (name.startswith("zdebug_")) {
643 uint64_t OriginalSize;
644 if (!zlib::isAvailable() ||
645 !consumeCompressedDebugSectionHeader(data, OriginalSize))
647 UncompressedSections.resize(UncompressedSections.size() + 1);
648 if (zlib::uncompress(data, UncompressedSections.back(), OriginalSize) !=
650 UncompressedSections.pop_back();
653 // Make data point to uncompressed section contents and save its contents.
654 name = name.substr(1);
655 data = UncompressedSections.back();
658 StringRef *SectionData =
659 StringSwitch<StringRef *>(name)
660 .Case("debug_info", &InfoSection.Data)
661 .Case("debug_abbrev", &AbbrevSection)
662 .Case("debug_loc", &LocSection.Data)
663 .Case("debug_line", &LineSection.Data)
664 .Case("debug_aranges", &ARangeSection)
665 .Case("debug_frame", &DebugFrameSection)
666 .Case("debug_str", &StringSection)
667 .Case("debug_ranges", &RangeSection)
668 .Case("debug_pubnames", &PubNamesSection)
669 .Case("debug_pubtypes", &PubTypesSection)
670 .Case("debug_gnu_pubnames", &GnuPubNamesSection)
671 .Case("debug_gnu_pubtypes", &GnuPubTypesSection)
672 .Case("debug_info.dwo", &InfoDWOSection.Data)
673 .Case("debug_abbrev.dwo", &AbbrevDWOSection)
674 .Case("debug_loc.dwo", &LocDWOSection.Data)
675 .Case("debug_line.dwo", &LineDWOSection.Data)
676 .Case("debug_str.dwo", &StringDWOSection)
677 .Case("debug_str_offsets.dwo", &StringOffsetDWOSection)
678 .Case("debug_addr", &AddrSection)
679 // Any more debug info sections go here.
683 if (name == "debug_ranges") {
684 // FIXME: Use the other dwo range section when we emit it.
685 RangeDWOSection = data;
687 } else if (name == "debug_types") {
688 // Find debug_types data by section rather than name as there are
689 // multiple, comdat grouped, debug_types sections.
690 TypesSections[Section].Data = data;
691 } else if (name == "debug_types.dwo") {
692 TypesDWOSections[Section].Data = data;
695 section_iterator RelocatedSection = Section.getRelocatedSection();
696 if (RelocatedSection == Obj->section_end())
699 StringRef RelSecName;
700 RelocatedSection->getName(RelSecName);
701 RelSecName = RelSecName.substr(
702 RelSecName.find_first_not_of("._")); // Skip . and _ prefixes.
704 // TODO: Add support for relocations in other sections as needed.
705 // Record relocations for the debug_info and debug_line sections.
706 RelocAddrMap *Map = StringSwitch<RelocAddrMap*>(RelSecName)
707 .Case("debug_info", &InfoSection.Relocs)
708 .Case("debug_loc", &LocSection.Relocs)
709 .Case("debug_info.dwo", &InfoDWOSection.Relocs)
710 .Case("debug_line", &LineSection.Relocs)
713 // Find debug_types relocs by section rather than name as there are
714 // multiple, comdat grouped, debug_types sections.
715 if (RelSecName == "debug_types")
716 Map = &TypesSections[*RelocatedSection].Relocs;
717 else if (RelSecName == "debug_types.dwo")
718 Map = &TypesDWOSections[*RelocatedSection].Relocs;
723 if (Section.relocation_begin() != Section.relocation_end()) {
724 uint64_t SectionSize;
725 RelocatedSection->getSize(SectionSize);
726 for (const RelocationRef &Reloc : Section.relocations()) {
728 Reloc.getOffset(Address);
731 uint64_t SymAddr = 0;
732 // ELF relocations may need the symbol address
734 object::symbol_iterator Sym = Reloc.getSymbol();
735 Sym->getAddress(SymAddr);
738 object::RelocVisitor V(Obj->getFileFormatName());
739 // The section address is always 0 for debug sections.
740 object::RelocToApply R(V.visit(Type, Reloc, 0, SymAddr));
742 SmallString<32> Name;
743 error_code ec(Reloc.getTypeName(Name));
745 errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
747 errs() << "error: failed to compute relocation: "
752 if (Address + R.Width > SectionSize) {
753 errs() << "error: " << R.Width << "-byte relocation starting "
754 << Address << " bytes into section " << name << " which is "
755 << SectionSize << " bytes long.\n";
759 errs() << "error: can't handle a relocation of more than 8 bytes at "
763 DEBUG(dbgs() << "Writing " << format("%p", R.Value)
764 << " at " << format("%p", Address)
765 << " with width " << format("%d", R.Width)
767 Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
773 void DWARFContextInMemory::anchor() { }