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 "llvm/ADT/SmallString.h"
12 #include "llvm/ADT/StringSwitch.h"
13 #include "llvm/Support/Compression.h"
14 #include "llvm/Support/Dwarf.h"
15 #include "llvm/Support/Format.h"
16 #include "llvm/Support/Path.h"
17 #include "llvm/Support/raw_ostream.h"
20 using namespace dwarf;
21 using namespace object;
23 #define DEBUG_TYPE "dwarf"
25 typedef DWARFDebugLine::LineTable DWARFLineTable;
27 static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data,
28 bool LittleEndian, bool GnuStyle) {
29 OS << "\n." << Name << " contents:\n";
30 DataExtractor pubNames(Data, LittleEndian, 0);
32 while (pubNames.isValidOffset(offset)) {
33 OS << "length = " << format("0x%08x", pubNames.getU32(&offset));
34 OS << " version = " << format("0x%04x", pubNames.getU16(&offset));
35 OS << " unit_offset = " << format("0x%08x", pubNames.getU32(&offset));
36 OS << " unit_size = " << format("0x%08x", pubNames.getU32(&offset)) << '\n';
38 OS << "Offset Linkage Kind Name\n";
40 OS << "Offset Name\n";
42 while (offset < Data.size()) {
43 uint32_t dieRef = pubNames.getU32(&offset);
46 OS << format("0x%8.8x ", dieRef);
48 PubIndexEntryDescriptor desc(pubNames.getU8(&offset));
49 OS << format("%-8s", dwarf::GDBIndexEntryLinkageString(desc.Linkage))
50 << ' ' << format("%-8s", dwarf::GDBIndexEntryKindString(desc.Kind))
53 OS << '\"' << pubNames.getCStr(&offset) << "\"\n";
58 void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
59 if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
60 OS << ".debug_abbrev contents:\n";
61 getDebugAbbrev()->dump(OS);
64 if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo)
65 if (const DWARFDebugAbbrev *D = getDebugAbbrevDWO()) {
66 OS << "\n.debug_abbrev.dwo contents:\n";
70 if (DumpType == DIDT_All || DumpType == DIDT_Info) {
71 OS << "\n.debug_info contents:\n";
72 for (const auto &CU : compile_units())
76 if ((DumpType == DIDT_All || DumpType == DIDT_InfoDwo) &&
77 getNumDWOCompileUnits()) {
78 OS << "\n.debug_info.dwo contents:\n";
79 for (const auto &DWOCU : dwo_compile_units())
83 if ((DumpType == DIDT_All || DumpType == DIDT_Types) && getNumTypeUnits()) {
84 OS << "\n.debug_types contents:\n";
85 for (const auto &TU : type_units())
89 if ((DumpType == DIDT_All || DumpType == DIDT_TypesDwo) &&
90 getNumDWOTypeUnits()) {
91 OS << "\n.debug_types.dwo contents:\n";
92 for (const auto &DWOTU : dwo_type_units())
96 if (DumpType == DIDT_All || DumpType == DIDT_Loc) {
97 OS << "\n.debug_loc contents:\n";
98 getDebugLoc()->dump(OS);
101 if (DumpType == DIDT_All || DumpType == DIDT_LocDwo) {
102 OS << "\n.debug_loc.dwo contents:\n";
103 getDebugLocDWO()->dump(OS);
106 if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
107 OS << "\n.debug_frame contents:\n";
108 getDebugFrame()->dump(OS);
112 if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
113 OS << "\n.debug_aranges contents:\n";
114 DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
115 DWARFDebugArangeSet set;
116 while (set.extract(arangesData, &offset))
120 uint8_t savedAddressByteSize = 0;
121 if (DumpType == DIDT_All || DumpType == DIDT_Line) {
122 OS << "\n.debug_line contents:\n";
123 for (const auto &CU : compile_units()) {
124 savedAddressByteSize = CU->getAddressByteSize();
125 unsigned stmtOffset =
126 CU->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
127 CU.get(), DW_AT_stmt_list, -1U);
128 if (stmtOffset != -1U) {
129 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
130 savedAddressByteSize);
131 DWARFDebugLine::DumpingState state(OS);
132 DWARFDebugLine::parseStatementTable(lineData, &getLineSection().Relocs, &stmtOffset, state);
137 if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
138 OS << "\n.debug_line.dwo contents:\n";
139 unsigned stmtOffset = 0;
140 DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
141 savedAddressByteSize);
142 DWARFDebugLine::DumpingState state(OS);
143 while (DWARFDebugLine::parsePrologue(lineData, &stmtOffset, &state.Prologue))
147 if (DumpType == DIDT_All || DumpType == DIDT_Str) {
148 OS << "\n.debug_str contents:\n";
149 DataExtractor strData(getStringSection(), isLittleEndian(), 0);
151 uint32_t strOffset = 0;
152 while (const char *s = strData.getCStr(&offset)) {
153 OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
158 if ((DumpType == DIDT_All || DumpType == DIDT_StrDwo) &&
159 !getStringDWOSection().empty()) {
160 OS << "\n.debug_str.dwo contents:\n";
161 DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
163 uint32_t strDWOOffset = 0;
164 while (const char *s = strDWOData.getCStr(&offset)) {
165 OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
166 strDWOOffset = offset;
170 if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
171 OS << "\n.debug_ranges contents:\n";
172 // In fact, different compile units may have different address byte
173 // sizes, but for simplicity we just use the address byte size of the last
174 // compile unit (there is no easy and fast way to associate address range
175 // list and the compile unit it describes).
176 DataExtractor rangesData(getRangeSection(), isLittleEndian(),
177 savedAddressByteSize);
179 DWARFDebugRangeList rangeList;
180 while (rangeList.extract(rangesData, &offset))
184 if (DumpType == DIDT_All || DumpType == DIDT_Pubnames)
185 dumpPubSection(OS, "debug_pubnames", getPubNamesSection(),
186 isLittleEndian(), false);
188 if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes)
189 dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(),
190 isLittleEndian(), false);
192 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames)
193 dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(),
194 isLittleEndian(), true /* GnuStyle */);
196 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes)
197 dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(),
198 isLittleEndian(), true /* GnuStyle */);
200 if ((DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) &&
201 !getStringOffsetDWOSection().empty()) {
202 OS << "\n.debug_str_offsets.dwo contents:\n";
203 DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(),
206 uint64_t size = getStringOffsetDWOSection().size();
207 while (offset < size) {
208 OS << format("0x%8.8x: ", offset);
209 OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
214 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
218 DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
220 Abbrev.reset(new DWARFDebugAbbrev());
221 Abbrev->parse(abbrData);
225 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
227 return AbbrevDWO.get();
229 DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
230 AbbrevDWO.reset(new DWARFDebugAbbrev());
231 AbbrevDWO->parse(abbrData);
232 return AbbrevDWO.get();
235 const DWARFDebugLoc *DWARFContext::getDebugLoc() {
239 DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0);
240 Loc.reset(new DWARFDebugLoc(getLocSection().Relocs));
241 // assume all compile units have the same address byte size
242 if (getNumCompileUnits())
243 Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize());
247 const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
251 DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0);
252 LocDWO.reset(new DWARFDebugLocDWO());
253 LocDWO->parse(LocData);
257 const DWARFDebugAranges *DWARFContext::getDebugAranges() {
259 return Aranges.get();
261 Aranges.reset(new DWARFDebugAranges());
262 Aranges->generate(this);
263 return Aranges.get();
266 const DWARFDebugFrame *DWARFContext::getDebugFrame() {
268 return DebugFrame.get();
270 // There's a "bug" in the DWARFv3 standard with respect to the target address
271 // size within debug frame sections. While DWARF is supposed to be independent
272 // of its container, FDEs have fields with size being "target address size",
273 // which isn't specified in DWARF in general. It's only specified for CUs, but
274 // .eh_frame can appear without a .debug_info section. Follow the example of
275 // other tools (libdwarf) and extract this from the container (ObjectFile
276 // provides this information). This problem is fixed in DWARFv4
277 // See this dwarf-discuss discussion for more details:
278 // http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
279 DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
281 DebugFrame.reset(new DWARFDebugFrame());
282 DebugFrame->parse(debugFrameData);
283 return DebugFrame.get();
286 const DWARFLineTable *
287 DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
289 Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
291 unsigned stmtOffset =
292 cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
293 cu, DW_AT_stmt_list, -1U);
294 if (stmtOffset == -1U)
295 return nullptr; // No line table for this compile unit.
297 // See if the line table is cached.
298 if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
301 // We have to parse it first.
302 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
303 cu->getAddressByteSize());
304 return Line->getOrParseLineTable(lineData, stmtOffset);
307 void DWARFContext::parseCompileUnits() {
311 const DataExtractor &DIData = DataExtractor(getInfoSection().Data,
312 isLittleEndian(), 0);
313 while (DIData.isValidOffset(offset)) {
314 std::unique_ptr<DWARFCompileUnit> CU(new DWARFCompileUnit(
315 getDebugAbbrev(), getInfoSection().Data, getRangeSection(),
316 getStringSection(), StringRef(), getAddrSection(),
317 &getInfoSection().Relocs, isLittleEndian()));
318 if (!CU->extract(DIData, &offset)) {
321 CUs.push_back(std::move(CU));
322 offset = CUs.back()->getNextUnitOffset();
326 void DWARFContext::parseTypeUnits() {
329 for (const auto &I : getTypesSections()) {
331 const DataExtractor &DIData =
332 DataExtractor(I.second.Data, isLittleEndian(), 0);
333 while (DIData.isValidOffset(offset)) {
334 std::unique_ptr<DWARFTypeUnit> TU(
335 new DWARFTypeUnit(getDebugAbbrev(), I.second.Data, getRangeSection(),
336 getStringSection(), StringRef(), getAddrSection(),
337 &I.second.Relocs, isLittleEndian()));
338 if (!TU->extract(DIData, &offset))
340 TUs.push_back(std::move(TU));
341 offset = TUs.back()->getNextUnitOffset();
346 void DWARFContext::parseDWOCompileUnits() {
350 const DataExtractor &DIData =
351 DataExtractor(getInfoDWOSection().Data, isLittleEndian(), 0);
352 while (DIData.isValidOffset(offset)) {
353 std::unique_ptr<DWARFCompileUnit> DWOCU(new DWARFCompileUnit(
354 getDebugAbbrevDWO(), getInfoDWOSection().Data, getRangeDWOSection(),
355 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
356 &getInfoDWOSection().Relocs, isLittleEndian()));
357 if (!DWOCU->extract(DIData, &offset)) {
360 DWOCUs.push_back(std::move(DWOCU));
361 offset = DWOCUs.back()->getNextUnitOffset();
365 void DWARFContext::parseDWOTypeUnits() {
368 for (const auto &I : getTypesDWOSections()) {
370 const DataExtractor &DIData =
371 DataExtractor(I.second.Data, isLittleEndian(), 0);
372 while (DIData.isValidOffset(offset)) {
373 std::unique_ptr<DWARFTypeUnit> TU(new DWARFTypeUnit(
374 getDebugAbbrevDWO(), I.second.Data, getRangeDWOSection(),
375 getStringDWOSection(), getStringOffsetDWOSection(), getAddrSection(),
376 &I.second.Relocs, isLittleEndian()));
377 if (!TU->extract(DIData, &offset))
379 DWOTUs.push_back(std::move(TU));
380 offset = DWOTUs.back()->getNextUnitOffset();
386 struct OffsetComparator {
388 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
389 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
390 return LHS->getOffset() < RHS->getOffset();
392 bool operator()(const std::unique_ptr<DWARFCompileUnit> &LHS,
393 uint32_t RHS) const {
394 return LHS->getOffset() < RHS;
396 bool operator()(uint32_t LHS,
397 const std::unique_ptr<DWARFCompileUnit> &RHS) const {
398 return LHS < RHS->getOffset();
403 DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
406 std::unique_ptr<DWARFCompileUnit> *CU =
407 std::lower_bound(CUs.begin(), CUs.end(), Offset, OffsetComparator());
408 if (CU != CUs.end()) {
414 DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
415 // First, get the offset of the compile unit.
416 uint32_t CUOffset = getDebugAranges()->findAddress(Address);
417 // Retrieve the compile unit.
418 return getCompileUnitForOffset(CUOffset);
421 static bool getFileNameForCompileUnit(DWARFCompileUnit *CU,
422 const DWARFLineTable *LineTable,
424 bool NeedsAbsoluteFilePath,
425 std::string &FileName) {
426 if (!CU || !LineTable ||
427 !LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath,
430 if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) {
431 // We may still need to append compilation directory of compile unit.
432 SmallString<16> AbsolutePath;
433 if (const char *CompilationDir = CU->getCompilationDir()) {
434 sys::path::append(AbsolutePath, CompilationDir);
436 sys::path::append(AbsolutePath, FileName);
437 FileName = AbsolutePath.str();
442 static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
443 const DWARFLineTable *LineTable,
445 bool NeedsAbsoluteFilePath,
446 DILineInfo &Result) {
447 if (!CU || !LineTable)
449 // Get the index of row we're looking for in the line table.
450 uint32_t RowIndex = LineTable->lookupAddress(Address);
453 // Take file number and line/column from the row.
454 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
455 if (!getFileNameForCompileUnit(CU, LineTable, Row.File, NeedsAbsoluteFilePath,
458 Result.Line = Row.Line;
459 Result.Column = Row.Column;
463 static bool getFunctionNameForAddress(DWARFCompileUnit *CU, uint64_t Address,
464 std::string &FunctionName) {
465 // The address may correspond to instruction in some inlined function,
466 // so we have to build the chain of inlined functions and take the
467 // name of the topmost function in it.
468 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
469 CU->getInlinedChainForAddress(Address);
470 if (InlinedChain.DIEs.size() == 0)
472 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
473 if (const char *Name = TopFunctionDIE.getSubroutineName(InlinedChain.U)) {
480 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
481 DILineInfoSpecifier Specifier) {
484 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
487 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
488 getFunctionNameForAddress(CU, Address, Result.FunctionName);
490 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
491 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
492 const bool NeedsAbsoluteFilePath =
493 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
494 getFileLineInfoForCompileUnit(CU, LineTable, Address, NeedsAbsoluteFilePath,
500 DILineInfoTable DWARFContext::getLineInfoForAddressRange(uint64_t Address,
502 DILineInfoSpecifier Specifier) {
503 DILineInfoTable Lines;
504 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
508 std::string FunctionName = "<invalid>";
509 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
510 getFunctionNameForAddress(CU, Address, FunctionName);
513 // If the Specifier says we don't need FileLineInfo, just
514 // return the top-most function at the starting address.
515 if (!Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
517 Result.FunctionName = FunctionName;
518 Lines.push_back(std::make_pair(Address, Result));
522 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
523 const bool NeedsAbsoluteFilePath =
524 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
526 // Get the index of row we're looking for in the line table.
527 std::vector<uint32_t> RowVector;
528 if (!LineTable->lookupAddressRange(Address, Size, RowVector))
531 for (uint32_t RowIndex : RowVector) {
532 // Take file number and line/column from the row.
533 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
535 getFileNameForCompileUnit(CU, LineTable, Row.File, NeedsAbsoluteFilePath,
537 Result.FunctionName = FunctionName;
538 Result.Line = Row.Line;
539 Result.Column = Row.Column;
540 Lines.push_back(std::make_pair(Row.Address, Result));
546 DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
547 DILineInfoSpecifier Specifier) {
548 DIInliningInfo InliningInfo;
550 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
554 const DWARFLineTable *LineTable = nullptr;
555 const bool NeedsAbsoluteFilePath =
556 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
557 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
558 CU->getInlinedChainForAddress(Address);
559 if (InlinedChain.DIEs.size() == 0) {
560 // If there is no DIE for address (e.g. it is in unavailable .dwo file),
561 // try to at least get file/line info from symbol table.
562 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
564 LineTable = getLineTableForCompileUnit(CU);
565 if (getFileLineInfoForCompileUnit(CU, LineTable, Address,
566 NeedsAbsoluteFilePath, Frame)) {
567 InliningInfo.addFrame(Frame);
573 uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
574 for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) {
575 const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i];
577 // Get function name if necessary.
578 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
579 if (const char *Name = FunctionDIE.getSubroutineName(InlinedChain.U))
580 Frame.FunctionName = Name;
582 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
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,
589 NeedsAbsoluteFilePath, Frame);
591 // Otherwise, use call file, call line and call column from
592 // previous DIE in inlined chain.
593 getFileNameForCompileUnit(CU, LineTable, CallFile,
594 NeedsAbsoluteFilePath, Frame.FileName);
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() { }