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 typedef DWARFDebugLine::LineTable DWARFLineTable;
25 static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data,
26 bool LittleEndian, bool GnuStyle) {
27 OS << "\n." << Name << " contents:\n";
28 DataExtractor pubNames(Data, LittleEndian, 0);
30 while (pubNames.isValidOffset(offset)) {
31 OS << "length = " << format("0x%08x", pubNames.getU32(&offset));
32 OS << " version = " << format("0x%04x", pubNames.getU16(&offset));
33 OS << " unit_offset = " << format("0x%08x", pubNames.getU32(&offset));
34 OS << " unit_size = " << format("0x%08x", pubNames.getU32(&offset)) << '\n';
36 OS << "Offset Linkage Kind Name\n";
38 OS << "Offset Name\n";
40 while (offset < Data.size()) {
41 uint32_t dieRef = pubNames.getU32(&offset);
44 OS << format("0x%8.8x ", dieRef);
46 PubIndexEntryDescriptor desc(pubNames.getU8(&offset));
47 OS << format("%-8s", dwarf::GDBIndexEntryLinkageString(desc.Linkage))
48 << ' ' << format("%-8s", dwarf::GDBIndexEntryKindString(desc.Kind))
51 OS << '\"' << pubNames.getCStr(&offset) << "\"\n";
56 void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
57 if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
58 OS << ".debug_abbrev contents:\n";
59 getDebugAbbrev()->dump(OS);
62 if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo)
63 if (const DWARFDebugAbbrev *D = getDebugAbbrevDWO()) {
64 OS << "\n.debug_abbrev.dwo contents:\n";
68 if (DumpType == DIDT_All || DumpType == DIDT_Info) {
69 OS << "\n.debug_info contents:\n";
70 for (const auto &CU : compile_units())
74 if ((DumpType == DIDT_All || DumpType == DIDT_InfoDwo) &&
75 getNumDWOCompileUnits()) {
76 OS << "\n.debug_info.dwo contents:\n";
77 for (const auto &DWOCU : dwo_compile_units())
81 if ((DumpType == DIDT_All || DumpType == DIDT_Types) && getNumTypeUnits()) {
82 OS << "\n.debug_types contents:\n";
83 for (const auto &TU : type_units())
87 if ((DumpType == DIDT_All || DumpType == DIDT_TypesDwo) &&
88 getNumDWOTypeUnits()) {
89 OS << "\n.debug_types.dwo contents:\n";
90 for (const auto &DWOTU : dwo_type_units())
94 if (DumpType == DIDT_All || DumpType == DIDT_Loc) {
95 OS << "\n.debug_loc contents:\n";
96 getDebugLoc()->dump(OS);
99 if (DumpType == DIDT_All || DumpType == DIDT_LocDwo) {
100 OS << "\n.debug_loc.dwo contents:\n";
101 getDebugLocDWO()->dump(OS);
104 if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
105 OS << "\n.debug_frame contents:\n";
106 getDebugFrame()->dump(OS);
110 if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
111 OS << "\n.debug_aranges contents:\n";
112 DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
113 DWARFDebugArangeSet set;
114 while (set.extract(arangesData, &offset))
118 uint8_t savedAddressByteSize = 0;
119 if (DumpType == DIDT_All || DumpType == DIDT_Line) {
120 OS << "\n.debug_line contents:\n";
121 for (const auto &CU : compile_units()) {
122 savedAddressByteSize = CU->getAddressByteSize();
123 unsigned stmtOffset =
124 CU->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
125 CU.get(), DW_AT_stmt_list, -1U);
126 if (stmtOffset != -1U) {
127 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
128 savedAddressByteSize);
129 DWARFDebugLine::DumpingState state(OS);
130 DWARFDebugLine::parseStatementTable(lineData, &getLineSection().Relocs, &stmtOffset, state);
135 if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
136 OS << "\n.debug_line.dwo contents:\n";
137 unsigned stmtOffset = 0;
138 DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
139 savedAddressByteSize);
140 DWARFDebugLine::DumpingState state(OS);
141 while (DWARFDebugLine::parsePrologue(lineData, &stmtOffset, &state.Prologue))
145 if (DumpType == DIDT_All || DumpType == DIDT_Str) {
146 OS << "\n.debug_str contents:\n";
147 DataExtractor strData(getStringSection(), isLittleEndian(), 0);
149 uint32_t strOffset = 0;
150 while (const char *s = strData.getCStr(&offset)) {
151 OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
156 if ((DumpType == DIDT_All || DumpType == DIDT_StrDwo) &&
157 !getStringDWOSection().empty()) {
158 OS << "\n.debug_str.dwo contents:\n";
159 DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
161 uint32_t strDWOOffset = 0;
162 while (const char *s = strDWOData.getCStr(&offset)) {
163 OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
164 strDWOOffset = offset;
168 if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
169 OS << "\n.debug_ranges contents:\n";
170 // In fact, different compile units may have different address byte
171 // sizes, but for simplicity we just use the address byte size of the last
172 // compile unit (there is no easy and fast way to associate address range
173 // list and the compile unit it describes).
174 DataExtractor rangesData(getRangeSection(), isLittleEndian(),
175 savedAddressByteSize);
177 DWARFDebugRangeList rangeList;
178 while (rangeList.extract(rangesData, &offset))
182 if (DumpType == DIDT_All || DumpType == DIDT_Pubnames)
183 dumpPubSection(OS, "debug_pubnames", getPubNamesSection(),
184 isLittleEndian(), false);
186 if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes)
187 dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(),
188 isLittleEndian(), false);
190 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames)
191 dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(),
192 isLittleEndian(), true /* GnuStyle */);
194 if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes)
195 dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(),
196 isLittleEndian(), true /* GnuStyle */);
198 if ((DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) &&
199 !getStringOffsetDWOSection().empty()) {
200 OS << "\n.debug_str_offsets.dwo contents:\n";
201 DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(),
204 uint64_t size = getStringOffsetDWOSection().size();
205 while (offset < size) {
206 OS << format("0x%8.8x: ", offset);
207 OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
212 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
216 DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
218 Abbrev.reset(new DWARFDebugAbbrev());
219 Abbrev->parse(abbrData);
223 const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
225 return AbbrevDWO.get();
227 DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
228 AbbrevDWO.reset(new DWARFDebugAbbrev());
229 AbbrevDWO->parse(abbrData);
230 return AbbrevDWO.get();
233 const DWARFDebugLoc *DWARFContext::getDebugLoc() {
237 DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0);
238 Loc.reset(new DWARFDebugLoc(getLocSection().Relocs));
239 // assume all compile units have the same address byte size
240 if (getNumCompileUnits())
241 Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize());
245 const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
249 DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0);
250 LocDWO.reset(new DWARFDebugLocDWO());
251 LocDWO->parse(LocData);
255 const DWARFDebugAranges *DWARFContext::getDebugAranges() {
257 return Aranges.get();
259 Aranges.reset(new DWARFDebugAranges());
260 Aranges->generate(this);
261 return Aranges.get();
264 const DWARFDebugFrame *DWARFContext::getDebugFrame() {
266 return DebugFrame.get();
268 // There's a "bug" in the DWARFv3 standard with respect to the target address
269 // size within debug frame sections. While DWARF is supposed to be independent
270 // of its container, FDEs have fields with size being "target address size",
271 // which isn't specified in DWARF in general. It's only specified for CUs, but
272 // .eh_frame can appear without a .debug_info section. Follow the example of
273 // other tools (libdwarf) and extract this from the container (ObjectFile
274 // provides this information). This problem is fixed in DWARFv4
275 // See this dwarf-discuss discussion for more details:
276 // http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
277 DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
279 DebugFrame.reset(new DWARFDebugFrame());
280 DebugFrame->parse(debugFrameData);
281 return DebugFrame.get();
284 const DWARFLineTable *
285 DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
287 Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
289 unsigned stmtOffset =
290 cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
291 cu, DW_AT_stmt_list, -1U);
292 if (stmtOffset == -1U)
293 return 0; // No line table for this compile unit.
295 // See if the line table is cached.
296 if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
299 // We have to parse it first.
300 DataExtractor lineData(getLineSection().Data, isLittleEndian(),
301 cu->getAddressByteSize());
302 return Line->getOrParseLineTable(lineData, stmtOffset);
305 void DWARFContext::parseCompileUnits() {
309 const DataExtractor &DIData = DataExtractor(getInfoSection().Data,
310 isLittleEndian(), 0);
311 while (DIData.isValidOffset(offset)) {
312 std::unique_ptr<DWARFCompileUnit> CU(new DWARFCompileUnit(
313 getDebugAbbrev(), getInfoSection().Data, getAbbrevSection(),
314 getRangeSection(), getStringSection(), StringRef(), getAddrSection(),
315 &getInfoSection().Relocs, isLittleEndian()));
316 if (!CU->extract(DIData, &offset)) {
319 CUs.push_back(std::move(CU));
320 offset = CUs.back()->getNextUnitOffset();
324 void DWARFContext::parseTypeUnits() {
327 for (const auto &I : getTypesSections()) {
329 const DataExtractor &DIData =
330 DataExtractor(I.second.Data, isLittleEndian(), 0);
331 while (DIData.isValidOffset(offset)) {
332 std::unique_ptr<DWARFTypeUnit> TU(new DWARFTypeUnit(
333 getDebugAbbrev(), I.second.Data, getAbbrevSection(),
334 getRangeSection(), getStringSection(), StringRef(), getAddrSection(),
335 &I.second.Relocs, isLittleEndian()));
336 if (!TU->extract(DIData, &offset))
338 TUs.push_back(std::move(TU));
339 offset = TUs.back()->getNextUnitOffset();
344 void DWARFContext::parseDWOCompileUnits() {
348 const DataExtractor &DIData =
349 DataExtractor(getInfoDWOSection().Data, isLittleEndian(), 0);
350 while (DIData.isValidOffset(offset)) {
351 std::unique_ptr<DWARFCompileUnit> DWOCU(new DWARFCompileUnit(
352 getDebugAbbrevDWO(), getInfoDWOSection().Data, getAbbrevDWOSection(),
353 getRangeDWOSection(), getStringDWOSection(),
354 getStringOffsetDWOSection(), getAddrSection(),
355 &getInfoDWOSection().Relocs, isLittleEndian()));
356 if (!DWOCU->extract(DIData, &offset)) {
359 DWOCUs.push_back(std::move(DWOCU));
360 offset = DWOCUs.back()->getNextUnitOffset();
364 void DWARFContext::parseDWOTypeUnits() {
367 for (const auto &I : getTypesDWOSections()) {
369 const DataExtractor &DIData =
370 DataExtractor(I.second.Data, isLittleEndian(), 0);
371 while (DIData.isValidOffset(offset)) {
372 std::unique_ptr<DWARFTypeUnit> TU(new DWARFTypeUnit(
373 getDebugAbbrevDWO(), I.second.Data, getAbbrevDWOSection(),
374 getRangeDWOSection(), getStringDWOSection(),
375 getStringOffsetDWOSection(), getAddrSection(), &I.second.Relocs,
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) {
428 !LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath,
431 if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) {
432 // We may still need to append compilation directory of compile unit.
433 SmallString<16> AbsolutePath;
434 if (const char *CompilationDir = CU->getCompilationDir()) {
435 sys::path::append(AbsolutePath, CompilationDir);
437 sys::path::append(AbsolutePath, FileName);
438 FileName = AbsolutePath.str();
443 static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
444 const DWARFLineTable *LineTable,
446 bool NeedsAbsoluteFilePath,
447 std::string &FileName,
448 uint32_t &Line, uint32_t &Column) {
449 if (CU == 0 || LineTable == 0)
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,
458 NeedsAbsoluteFilePath, FileName))
465 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
466 DILineInfoSpecifier Specifier) {
467 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
470 std::string FileName = "<invalid>";
471 std::string FunctionName = "<invalid>";
474 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
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) {
481 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
482 if (const char *Name = TopFunctionDIE.getSubroutineName(InlinedChain.U))
486 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
487 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
488 const bool NeedsAbsoluteFilePath =
489 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
490 getFileLineInfoForCompileUnit(CU, LineTable, Address,
491 NeedsAbsoluteFilePath,
492 FileName, Line, Column);
494 return DILineInfo(StringRef(FileName), StringRef(FunctionName),
498 DILineInfoTable DWARFContext::getLineInfoForAddressRange(uint64_t Address,
500 DILineInfoSpecifier Specifier) {
501 DILineInfoTable Lines;
502 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
506 std::string FunctionName = "<invalid>";
507 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
508 // The address may correspond to instruction in some inlined function,
509 // so we have to build the chain of inlined functions and take the
510 // name of the topmost function in it.
511 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
512 CU->getInlinedChainForAddress(Address);
513 if (InlinedChain.DIEs.size() > 0) {
514 const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
515 if (const char *Name = TopFunctionDIE.getSubroutineName(InlinedChain.U))
520 // If the Specifier says we don't need FileLineInfo, just
521 // return the top-most function at the starting address.
522 if (!Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
524 std::make_pair(Address, DILineInfo("<invalid>", FunctionName, 0, 0)));
528 const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
529 const bool NeedsAbsoluteFilePath =
530 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
532 // Get the index of row we're looking for in the line table.
533 std::vector<uint32_t> RowVector;
534 if (!LineTable->lookupAddressRange(Address, Size, RowVector))
537 for (uint32_t RowIndex : RowVector) {
538 // Take file number and line/column from the row.
539 const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
540 std::string FileName = "<invalid>";
541 getFileNameForCompileUnit(CU, LineTable, Row.File,
542 NeedsAbsoluteFilePath, FileName);
543 Lines.push_back(std::make_pair(
544 Row.Address, DILineInfo(FileName, FunctionName, Row.Line, Row.Column)));
550 DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
551 DILineInfoSpecifier Specifier) {
552 DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
554 return DIInliningInfo();
556 const DWARFDebugInfoEntryInlinedChain &InlinedChain =
557 CU->getInlinedChainForAddress(Address);
558 if (InlinedChain.DIEs.size() == 0)
559 return DIInliningInfo();
561 DIInliningInfo InliningInfo;
562 uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
563 const DWARFLineTable *LineTable = 0;
564 for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) {
565 const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i];
566 std::string FileName = "<invalid>";
567 std::string FunctionName = "<invalid>";
570 // Get function name if necessary.
571 if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
572 if (const char *Name = FunctionDIE.getSubroutineName(InlinedChain.U))
575 if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
576 const bool NeedsAbsoluteFilePath =
577 Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
579 // For the topmost frame, initialize the line table of this
580 // compile unit and fetch file/line info from it.
581 LineTable = getLineTableForCompileUnit(CU);
582 // For the topmost routine, get file/line info from line table.
583 getFileLineInfoForCompileUnit(CU, LineTable, Address,
584 NeedsAbsoluteFilePath,
585 FileName, Line, Column);
587 // Otherwise, use call file, call line and call column from
588 // previous DIE in inlined chain.
589 getFileNameForCompileUnit(CU, LineTable, CallFile,
590 NeedsAbsoluteFilePath, FileName);
594 // Get call file/line/column of a current DIE.
596 FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine,
600 DILineInfo Frame(StringRef(FileName), StringRef(FunctionName),
602 InliningInfo.addFrame(Frame);
607 static bool consumeCompressedDebugSectionHeader(StringRef &data,
608 uint64_t &OriginalSize) {
609 // Consume "ZLIB" prefix.
610 if (!data.startswith("ZLIB"))
612 data = data.substr(4);
613 // Consume uncompressed section size (big-endian 8 bytes).
614 DataExtractor extractor(data, false, 8);
616 OriginalSize = extractor.getU64(&Offset);
619 data = data.substr(Offset);
623 DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj)
624 : IsLittleEndian(Obj->isLittleEndian()),
625 AddressSize(Obj->getBytesInAddress()) {
626 for (const SectionRef &Section : Obj->sections()) {
628 Section.getName(name);
630 Section.getContents(data);
632 name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
634 // Check if debug info section is compressed with zlib.
635 if (name.startswith("zdebug_")) {
636 uint64_t OriginalSize;
637 if (!zlib::isAvailable() ||
638 !consumeCompressedDebugSectionHeader(data, OriginalSize))
640 UncompressedSections.resize(UncompressedSections.size() + 1);
641 if (zlib::uncompress(data, UncompressedSections.back(), OriginalSize) !=
643 UncompressedSections.pop_back();
646 // Make data point to uncompressed section contents and save its contents.
647 name = name.substr(1);
648 data = UncompressedSections.back();
651 StringRef *SectionData =
652 StringSwitch<StringRef *>(name)
653 .Case("debug_info", &InfoSection.Data)
654 .Case("debug_abbrev", &AbbrevSection)
655 .Case("debug_loc", &LocSection.Data)
656 .Case("debug_line", &LineSection.Data)
657 .Case("debug_aranges", &ARangeSection)
658 .Case("debug_frame", &DebugFrameSection)
659 .Case("debug_str", &StringSection)
660 .Case("debug_ranges", &RangeSection)
661 .Case("debug_pubnames", &PubNamesSection)
662 .Case("debug_pubtypes", &PubTypesSection)
663 .Case("debug_gnu_pubnames", &GnuPubNamesSection)
664 .Case("debug_gnu_pubtypes", &GnuPubTypesSection)
665 .Case("debug_info.dwo", &InfoDWOSection.Data)
666 .Case("debug_abbrev.dwo", &AbbrevDWOSection)
667 .Case("debug_loc.dwo", &LocDWOSection.Data)
668 .Case("debug_line.dwo", &LineDWOSection.Data)
669 .Case("debug_str.dwo", &StringDWOSection)
670 .Case("debug_str_offsets.dwo", &StringOffsetDWOSection)
671 .Case("debug_addr", &AddrSection)
672 // Any more debug info sections go here.
676 if (name == "debug_ranges") {
677 // FIXME: Use the other dwo range section when we emit it.
678 RangeDWOSection = data;
680 } else if (name == "debug_types") {
681 // Find debug_types data by section rather than name as there are
682 // multiple, comdat grouped, debug_types sections.
683 TypesSections[Section].Data = data;
684 } else if (name == "debug_types.dwo") {
685 TypesDWOSections[Section].Data = data;
688 section_iterator RelocatedSection = Section.getRelocatedSection();
689 if (RelocatedSection == Obj->section_end())
692 StringRef RelSecName;
693 RelocatedSection->getName(RelSecName);
694 RelSecName = RelSecName.substr(
695 RelSecName.find_first_not_of("._")); // Skip . and _ prefixes.
697 // TODO: Add support for relocations in other sections as needed.
698 // Record relocations for the debug_info and debug_line sections.
699 RelocAddrMap *Map = StringSwitch<RelocAddrMap*>(RelSecName)
700 .Case("debug_info", &InfoSection.Relocs)
701 .Case("debug_loc", &LocSection.Relocs)
702 .Case("debug_info.dwo", &InfoDWOSection.Relocs)
703 .Case("debug_line", &LineSection.Relocs)
706 // Find debug_types relocs by section rather than name as there are
707 // multiple, comdat grouped, debug_types sections.
708 if (RelSecName == "debug_types")
709 Map = &TypesSections[*RelocatedSection].Relocs;
710 else if (RelSecName == "debug_types.dwo")
711 Map = &TypesDWOSections[*RelocatedSection].Relocs;
716 if (Section.relocation_begin() != Section.relocation_end()) {
717 uint64_t SectionSize;
718 RelocatedSection->getSize(SectionSize);
719 for (const RelocationRef &Reloc : Section.relocations()) {
721 Reloc.getOffset(Address);
724 uint64_t SymAddr = 0;
725 // ELF relocations may need the symbol address
727 object::symbol_iterator Sym = Reloc.getSymbol();
728 Sym->getAddress(SymAddr);
731 object::RelocVisitor V(Obj->getFileFormatName());
732 // The section address is always 0 for debug sections.
733 object::RelocToApply R(V.visit(Type, Reloc, 0, SymAddr));
735 SmallString<32> Name;
736 error_code ec(Reloc.getTypeName(Name));
738 errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
740 errs() << "error: failed to compute relocation: "
745 if (Address + R.Width > SectionSize) {
746 errs() << "error: " << R.Width << "-byte relocation starting "
747 << Address << " bytes into section " << name << " which is "
748 << SectionSize << " bytes long.\n";
752 errs() << "error: can't handle a relocation of more than 8 bytes at "
756 DEBUG(dbgs() << "Writing " << format("%p", R.Value)
757 << " at " << format("%p", Address)
758 << " with width " << format("%d", R.Width)
760 Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
766 void DWARFContextInMemory::anchor() { }