| //===-- DWARFContext.cpp --------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "DWARFContext.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/StringSwitch.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/Support/Compression.h" |
| #include "llvm/Support/Dwarf.h" |
| #include "llvm/Support/Format.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <algorithm> |
| using namespace llvm; |
| using namespace dwarf; |
| using namespace object; |
| |
| typedef DWARFDebugLine::LineTable DWARFLineTable; |
| |
| DWARFContext::~DWARFContext() { |
| DeleteContainerPointers(CUs); |
| DeleteContainerPointers(TUs); |
| DeleteContainerPointers(DWOCUs); |
| } |
| |
| static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data, |
| bool LittleEndian, bool GnuStyle) { |
| OS << "\n." << Name << " contents:\n"; |
| DataExtractor pubNames(Data, LittleEndian, 0); |
| uint32_t offset = 0; |
| OS << "length = " << format("0x%08x", pubNames.getU32(&offset)); |
| OS << " version = " << format("0x%04x", pubNames.getU16(&offset)); |
| OS << " unit_offset = " << format("0x%08x", pubNames.getU32(&offset)); |
| OS << " unit_size = " << format("0x%08x", pubNames.getU32(&offset)) << '\n'; |
| if (GnuStyle) |
| OS << "Offset Linkage Kind Name\n"; |
| else |
| OS << "Offset Name\n"; |
| |
| while (offset < Data.size()) { |
| uint32_t dieRef = pubNames.getU32(&offset); |
| if (dieRef == 0) |
| break; |
| OS << format("0x%8.8x ", dieRef); |
| if (GnuStyle) { |
| PubIndexEntryDescriptor desc(pubNames.getU8(&offset)); |
| OS << format("%-8s", dwarf::GDBIndexEntryLinkageString(desc.Linkage)) |
| << ' ' << format("%-8s", dwarf::GDBIndexEntryKindString(desc.Kind)) |
| << ' '; |
| } |
| OS << '\"' << pubNames.getCStr(&offset) << "\"\n"; |
| } |
| } |
| |
| void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) { |
| if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) { |
| OS << ".debug_abbrev contents:\n"; |
| getDebugAbbrev()->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Info) { |
| OS << "\n.debug_info contents:\n"; |
| for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) |
| getCompileUnitAtIndex(i)->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Types) { |
| OS << "\n.debug_types contents:\n"; |
| for (unsigned i = 0, e = getNumTypeUnits(); i != e; ++i) |
| getTypeUnitAtIndex(i)->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Loc) { |
| OS << "\n.debug_loc contents:\n"; |
| getDebugLoc()->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Frames) { |
| OS << "\n.debug_frame contents:\n"; |
| getDebugFrame()->dump(OS); |
| } |
| |
| uint32_t offset = 0; |
| if (DumpType == DIDT_All || DumpType == DIDT_Aranges) { |
| OS << "\n.debug_aranges contents:\n"; |
| DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0); |
| DWARFDebugArangeSet set; |
| while (set.extract(arangesData, &offset)) |
| set.dump(OS); |
| } |
| |
| uint8_t savedAddressByteSize = 0; |
| if (DumpType == DIDT_All || DumpType == DIDT_Line) { |
| OS << "\n.debug_line contents:\n"; |
| for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) { |
| DWARFCompileUnit *cu = getCompileUnitAtIndex(i); |
| savedAddressByteSize = cu->getAddressByteSize(); |
| unsigned stmtOffset = |
| cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset( |
| cu, DW_AT_stmt_list, -1U); |
| if (stmtOffset != -1U) { |
| DataExtractor lineData(getLineSection().Data, isLittleEndian(), |
| savedAddressByteSize); |
| DWARFDebugLine::DumpingState state(OS); |
| DWARFDebugLine::parseStatementTable(lineData, &getLineSection().Relocs, &stmtOffset, state); |
| } |
| } |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Str) { |
| OS << "\n.debug_str contents:\n"; |
| DataExtractor strData(getStringSection(), isLittleEndian(), 0); |
| offset = 0; |
| uint32_t strOffset = 0; |
| while (const char *s = strData.getCStr(&offset)) { |
| OS << format("0x%8.8x: \"%s\"\n", strOffset, s); |
| strOffset = offset; |
| } |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Ranges) { |
| OS << "\n.debug_ranges contents:\n"; |
| // In fact, different compile units may have different address byte |
| // sizes, but for simplicity we just use the address byte size of the last |
| // compile unit (there is no easy and fast way to associate address range |
| // list and the compile unit it describes). |
| DataExtractor rangesData(getRangeSection(), isLittleEndian(), |
| savedAddressByteSize); |
| offset = 0; |
| DWARFDebugRangeList rangeList; |
| while (rangeList.extract(rangesData, &offset)) |
| rangeList.dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Pubnames) |
| dumpPubSection(OS, "debug_pubnames", getPubNamesSection(), |
| isLittleEndian(), false); |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes) |
| dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(), |
| isLittleEndian(), false); |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames) |
| dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(), |
| isLittleEndian(), true /* GnuStyle */); |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes) |
| dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(), |
| isLittleEndian(), true /* GnuStyle */); |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo) { |
| const DWARFDebugAbbrev *D = getDebugAbbrevDWO(); |
| if (D) { |
| OS << "\n.debug_abbrev.dwo contents:\n"; |
| getDebugAbbrevDWO()->dump(OS); |
| } |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_InfoDwo) |
| if (getNumDWOCompileUnits()) { |
| OS << "\n.debug_info.dwo contents:\n"; |
| for (unsigned i = 0, e = getNumDWOCompileUnits(); i != e; ++i) |
| getDWOCompileUnitAtIndex(i)->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_StrDwo) |
| if (!getStringDWOSection().empty()) { |
| OS << "\n.debug_str.dwo contents:\n"; |
| DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0); |
| offset = 0; |
| uint32_t strDWOOffset = 0; |
| while (const char *s = strDWOData.getCStr(&offset)) { |
| OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s); |
| strDWOOffset = offset; |
| } |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) |
| if (!getStringOffsetDWOSection().empty()) { |
| OS << "\n.debug_str_offsets.dwo contents:\n"; |
| DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(), 0); |
| offset = 0; |
| uint64_t size = getStringOffsetDWOSection().size(); |
| while (offset < size) { |
| OS << format("0x%8.8x: ", offset); |
| OS << format("%8.8x\n", strOffsetExt.getU32(&offset)); |
| } |
| } |
| } |
| |
| const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() { |
| if (Abbrev) |
| return Abbrev.get(); |
| |
| DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0); |
| |
| Abbrev.reset(new DWARFDebugAbbrev()); |
| Abbrev->parse(abbrData); |
| return Abbrev.get(); |
| } |
| |
| const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() { |
| if (AbbrevDWO) |
| return AbbrevDWO.get(); |
| |
| DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0); |
| AbbrevDWO.reset(new DWARFDebugAbbrev()); |
| AbbrevDWO->parse(abbrData); |
| return AbbrevDWO.get(); |
| } |
| |
| const DWARFDebugLoc *DWARFContext::getDebugLoc() { |
| if (Loc) |
| return Loc.get(); |
| |
| DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0); |
| Loc.reset(new DWARFDebugLoc(getLocSection().Relocs)); |
| // assume all compile units have the same address byte size |
| if (getNumCompileUnits()) |
| Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize()); |
| return Loc.get(); |
| } |
| |
| const DWARFDebugAranges *DWARFContext::getDebugAranges() { |
| if (Aranges) |
| return Aranges.get(); |
| |
| Aranges.reset(new DWARFDebugAranges()); |
| Aranges->generate(this); |
| return Aranges.get(); |
| } |
| |
| const DWARFDebugFrame *DWARFContext::getDebugFrame() { |
| if (DebugFrame) |
| return DebugFrame.get(); |
| |
| // There's a "bug" in the DWARFv3 standard with respect to the target address |
| // size within debug frame sections. While DWARF is supposed to be independent |
| // of its container, FDEs have fields with size being "target address size", |
| // which isn't specified in DWARF in general. It's only specified for CUs, but |
| // .eh_frame can appear without a .debug_info section. Follow the example of |
| // other tools (libdwarf) and extract this from the container (ObjectFile |
| // provides this information). This problem is fixed in DWARFv4 |
| // See this dwarf-discuss discussion for more details: |
| // http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html |
| DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(), |
| getAddressSize()); |
| DebugFrame.reset(new DWARFDebugFrame()); |
| DebugFrame->parse(debugFrameData); |
| return DebugFrame.get(); |
| } |
| |
| const DWARFLineTable * |
| DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) { |
| if (!Line) |
| Line.reset(new DWARFDebugLine(&getLineSection().Relocs)); |
| |
| unsigned stmtOffset = |
| cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset( |
| cu, DW_AT_stmt_list, -1U); |
| if (stmtOffset == -1U) |
| return 0; // No line table for this compile unit. |
| |
| // See if the line table is cached. |
| if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset)) |
| return lt; |
| |
| // We have to parse it first. |
| DataExtractor lineData(getLineSection().Data, isLittleEndian(), |
| cu->getAddressByteSize()); |
| return Line->getOrParseLineTable(lineData, stmtOffset); |
| } |
| |
| void DWARFContext::parseCompileUnits() { |
| uint32_t offset = 0; |
| const DataExtractor &DIData = DataExtractor(getInfoSection().Data, |
| isLittleEndian(), 0); |
| while (DIData.isValidOffset(offset)) { |
| OwningPtr<DWARFCompileUnit> CU(new DWARFCompileUnit( |
| getDebugAbbrev(), getInfoSection().Data, getAbbrevSection(), |
| getRangeSection(), getStringSection(), StringRef(), getAddrSection(), |
| &getInfoSection().Relocs, isLittleEndian())); |
| if (!CU->extract(DIData, &offset)) { |
| break; |
| } |
| CUs.push_back(CU.take()); |
| offset = CUs.back()->getNextUnitOffset(); |
| } |
| } |
| |
| void DWARFContext::parseTypeUnits() { |
| const std::map<object::SectionRef, Section> &Sections = getTypesSections(); |
| for (std::map<object::SectionRef, Section>::const_iterator |
| I = Sections.begin(), |
| E = Sections.end(); |
| I != E; ++I) { |
| uint32_t offset = 0; |
| const DataExtractor &DIData = |
| DataExtractor(I->second.Data, isLittleEndian(), 0); |
| while (DIData.isValidOffset(offset)) { |
| OwningPtr<DWARFTypeUnit> TU(new DWARFTypeUnit( |
| getDebugAbbrev(), I->second.Data, getAbbrevSection(), |
| getRangeSection(), getStringSection(), StringRef(), getAddrSection(), |
| &I->second.Relocs, isLittleEndian())); |
| if (!TU->extract(DIData, &offset)) |
| break; |
| TUs.push_back(TU.take()); |
| offset = TUs.back()->getNextUnitOffset(); |
| } |
| } |
| } |
| |
| void DWARFContext::parseDWOCompileUnits() { |
| uint32_t offset = 0; |
| const DataExtractor &DIData = |
| DataExtractor(getInfoDWOSection().Data, isLittleEndian(), 0); |
| while (DIData.isValidOffset(offset)) { |
| OwningPtr<DWARFCompileUnit> DWOCU(new DWARFCompileUnit( |
| getDebugAbbrevDWO(), getInfoDWOSection().Data, getAbbrevDWOSection(), |
| getRangeDWOSection(), getStringDWOSection(), |
| getStringOffsetDWOSection(), getAddrSection(), |
| &getInfoDWOSection().Relocs, isLittleEndian())); |
| if (!DWOCU->extract(DIData, &offset)) { |
| break; |
| } |
| DWOCUs.push_back(DWOCU.take()); |
| offset = DWOCUs.back()->getNextUnitOffset(); |
| } |
| } |
| |
| namespace { |
| struct OffsetComparator { |
| bool operator()(const DWARFCompileUnit *LHS, |
| const DWARFCompileUnit *RHS) const { |
| return LHS->getOffset() < RHS->getOffset(); |
| } |
| bool operator()(const DWARFCompileUnit *LHS, uint32_t RHS) const { |
| return LHS->getOffset() < RHS; |
| } |
| bool operator()(uint32_t LHS, const DWARFCompileUnit *RHS) const { |
| return LHS < RHS->getOffset(); |
| } |
| }; |
| } |
| |
| DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) { |
| if (CUs.empty()) |
| parseCompileUnits(); |
| |
| DWARFCompileUnit **CU = |
| std::lower_bound(CUs.begin(), CUs.end(), Offset, OffsetComparator()); |
| if (CU != CUs.end()) { |
| return *CU; |
| } |
| return 0; |
| } |
| |
| DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) { |
| // First, get the offset of the compile unit. |
| uint32_t CUOffset = getDebugAranges()->findAddress(Address); |
| // Retrieve the compile unit. |
| return getCompileUnitForOffset(CUOffset); |
| } |
| |
| static bool getFileNameForCompileUnit(DWARFCompileUnit *CU, |
| const DWARFLineTable *LineTable, |
| uint64_t FileIndex, |
| bool NeedsAbsoluteFilePath, |
| std::string &FileName) { |
| if (CU == 0 || |
| LineTable == 0 || |
| !LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath, |
| FileName)) |
| return false; |
| if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) { |
| // We may still need to append compilation directory of compile unit. |
| SmallString<16> AbsolutePath; |
| if (const char *CompilationDir = CU->getCompilationDir()) { |
| sys::path::append(AbsolutePath, CompilationDir); |
| } |
| sys::path::append(AbsolutePath, FileName); |
| FileName = AbsolutePath.str(); |
| } |
| return true; |
| } |
| |
| static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU, |
| const DWARFLineTable *LineTable, |
| uint64_t Address, |
| bool NeedsAbsoluteFilePath, |
| std::string &FileName, |
| uint32_t &Line, uint32_t &Column) { |
| if (CU == 0 || LineTable == 0) |
| return false; |
| // Get the index of row we're looking for in the line table. |
| uint32_t RowIndex = LineTable->lookupAddress(Address); |
| if (RowIndex == -1U) |
| return false; |
| // Take file number and line/column from the row. |
| const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex]; |
| if (!getFileNameForCompileUnit(CU, LineTable, Row.File, |
| NeedsAbsoluteFilePath, FileName)) |
| return false; |
| Line = Row.Line; |
| Column = Row.Column; |
| return true; |
| } |
| |
| DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Specifier) { |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return DILineInfo(); |
| std::string FileName = "<invalid>"; |
| std::string FunctionName = "<invalid>"; |
| uint32_t Line = 0; |
| uint32_t Column = 0; |
| if (Specifier.needs(DILineInfoSpecifier::FunctionName)) { |
| // The address may correspond to instruction in some inlined function, |
| // so we have to build the chain of inlined functions and take the |
| // name of the topmost function in it. |
| const DWARFDebugInfoEntryInlinedChain &InlinedChain = |
| CU->getInlinedChainForAddress(Address); |
| if (InlinedChain.DIEs.size() > 0) { |
| const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0]; |
| if (const char *Name = TopFunctionDIE.getSubroutineName(InlinedChain.U)) |
| FunctionName = Name; |
| } |
| } |
| if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) { |
| const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU); |
| const bool NeedsAbsoluteFilePath = |
| Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath); |
| getFileLineInfoForCompileUnit(CU, LineTable, Address, |
| NeedsAbsoluteFilePath, |
| FileName, Line, Column); |
| } |
| return DILineInfo(StringRef(FileName), StringRef(FunctionName), |
| Line, Column); |
| } |
| |
| DILineInfoTable DWARFContext::getLineInfoForAddressRange(uint64_t Address, |
| uint64_t Size, |
| DILineInfoSpecifier Specifier) { |
| DILineInfoTable Lines; |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return Lines; |
| |
| std::string FunctionName = "<invalid>"; |
| if (Specifier.needs(DILineInfoSpecifier::FunctionName)) { |
| // The address may correspond to instruction in some inlined function, |
| // so we have to build the chain of inlined functions and take the |
| // name of the topmost function in it. |
| const DWARFDebugInfoEntryInlinedChain &InlinedChain = |
| CU->getInlinedChainForAddress(Address); |
| if (InlinedChain.DIEs.size() > 0) { |
| const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0]; |
| if (const char *Name = TopFunctionDIE.getSubroutineName(InlinedChain.U)) |
| FunctionName = Name; |
| } |
| } |
| |
| // If the Specifier says we don't need FileLineInfo, just |
| // return the top-most function at the starting address. |
| if (!Specifier.needs(DILineInfoSpecifier::FileLineInfo)) { |
| Lines.push_back( |
| std::make_pair(Address, DILineInfo("<invalid>", FunctionName, 0, 0))); |
| return Lines; |
| } |
| |
| const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU); |
| const bool NeedsAbsoluteFilePath = |
| Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath); |
| |
| // Get the index of row we're looking for in the line table. |
| std::vector<uint32_t> RowVector; |
| if (!LineTable->lookupAddressRange(Address, Size, RowVector)) |
| return Lines; |
| |
| uint32_t NumRows = RowVector.size(); |
| for (uint32_t i = 0; i < NumRows; ++i) { |
| uint32_t RowIndex = RowVector[i]; |
| // Take file number and line/column from the row. |
| const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex]; |
| std::string FileName = "<invalid>"; |
| getFileNameForCompileUnit(CU, LineTable, Row.File, |
| NeedsAbsoluteFilePath, FileName); |
| Lines.push_back(std::make_pair( |
| Row.Address, DILineInfo(FileName, FunctionName, Row.Line, Row.Column))); |
| } |
| |
| return Lines; |
| } |
| |
| DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Specifier) { |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return DIInliningInfo(); |
| |
| const DWARFDebugInfoEntryInlinedChain &InlinedChain = |
| CU->getInlinedChainForAddress(Address); |
| if (InlinedChain.DIEs.size() == 0) |
| return DIInliningInfo(); |
| |
| DIInliningInfo InliningInfo; |
| uint32_t CallFile = 0, CallLine = 0, CallColumn = 0; |
| const DWARFLineTable *LineTable = 0; |
| for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) { |
| const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i]; |
| std::string FileName = "<invalid>"; |
| std::string FunctionName = "<invalid>"; |
| uint32_t Line = 0; |
| uint32_t Column = 0; |
| // Get function name if necessary. |
| if (Specifier.needs(DILineInfoSpecifier::FunctionName)) { |
| if (const char *Name = FunctionDIE.getSubroutineName(InlinedChain.U)) |
| FunctionName = Name; |
| } |
| if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) { |
| const bool NeedsAbsoluteFilePath = |
| Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath); |
| if (i == 0) { |
| // For the topmost frame, initialize the line table of this |
| // compile unit and fetch file/line info from it. |
| LineTable = getLineTableForCompileUnit(CU); |
| // For the topmost routine, get file/line info from line table. |
| getFileLineInfoForCompileUnit(CU, LineTable, Address, |
| NeedsAbsoluteFilePath, |
| FileName, Line, Column); |
| } else { |
| // Otherwise, use call file, call line and call column from |
| // previous DIE in inlined chain. |
| getFileNameForCompileUnit(CU, LineTable, CallFile, |
| NeedsAbsoluteFilePath, FileName); |
| Line = CallLine; |
| Column = CallColumn; |
| } |
| // Get call file/line/column of a current DIE. |
| if (i + 1 < n) { |
| FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine, |
| CallColumn); |
| } |
| } |
| DILineInfo Frame(StringRef(FileName), StringRef(FunctionName), |
| Line, Column); |
| InliningInfo.addFrame(Frame); |
| } |
| return InliningInfo; |
| } |
| |
| static bool consumeCompressedDebugSectionHeader(StringRef &data, |
| uint64_t &OriginalSize) { |
| // Consume "ZLIB" prefix. |
| if (!data.startswith("ZLIB")) |
| return false; |
| data = data.substr(4); |
| // Consume uncompressed section size (big-endian 8 bytes). |
| DataExtractor extractor(data, false, 8); |
| uint32_t Offset = 0; |
| OriginalSize = extractor.getU64(&Offset); |
| if (Offset == 0) |
| return false; |
| data = data.substr(Offset); |
| return true; |
| } |
| |
| DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) : |
| IsLittleEndian(Obj->isLittleEndian()), |
| AddressSize(Obj->getBytesInAddress()) { |
| error_code ec; |
| for (object::section_iterator i = Obj->begin_sections(), |
| e = Obj->end_sections(); |
| i != e; i.increment(ec)) { |
| StringRef name; |
| i->getName(name); |
| StringRef data; |
| i->getContents(data); |
| |
| name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes. |
| |
| // Check if debug info section is compressed with zlib. |
| if (name.startswith("zdebug_")) { |
| uint64_t OriginalSize; |
| if (!zlib::isAvailable() || |
| !consumeCompressedDebugSectionHeader(data, OriginalSize)) |
| continue; |
| OwningPtr<MemoryBuffer> UncompressedSection; |
| if (zlib::uncompress(data, UncompressedSection, OriginalSize) != |
| zlib::StatusOK) |
| continue; |
| // Make data point to uncompressed section contents and save its contents. |
| name = name.substr(1); |
| data = UncompressedSection->getBuffer(); |
| UncompressedSections.push_back(UncompressedSection.take()); |
| } |
| |
| StringRef *Section = |
| StringSwitch<StringRef *>(name) |
| .Case("debug_info", &InfoSection.Data) |
| .Case("debug_abbrev", &AbbrevSection) |
| .Case("debug_loc", &LocSection.Data) |
| .Case("debug_line", &LineSection.Data) |
| .Case("debug_aranges", &ARangeSection) |
| .Case("debug_frame", &DebugFrameSection) |
| .Case("debug_str", &StringSection) |
| .Case("debug_ranges", &RangeSection) |
| .Case("debug_pubnames", &PubNamesSection) |
| .Case("debug_pubtypes", &PubTypesSection) |
| .Case("debug_gnu_pubnames", &GnuPubNamesSection) |
| .Case("debug_gnu_pubtypes", &GnuPubTypesSection) |
| .Case("debug_info.dwo", &InfoDWOSection.Data) |
| .Case("debug_abbrev.dwo", &AbbrevDWOSection) |
| .Case("debug_str.dwo", &StringDWOSection) |
| .Case("debug_str_offsets.dwo", &StringOffsetDWOSection) |
| .Case("debug_addr", &AddrSection) |
| // Any more debug info sections go here. |
| .Default(0); |
| if (Section) { |
| *Section = data; |
| if (name == "debug_ranges") { |
| // FIXME: Use the other dwo range section when we emit it. |
| RangeDWOSection = data; |
| } |
| } else if (name == "debug_types") { |
| // Find debug_types data by section rather than name as there are |
| // multiple, comdat grouped, debug_types sections. |
| TypesSections[*i].Data = data; |
| } |
| |
| section_iterator RelocatedSection = i->getRelocatedSection(); |
| if (RelocatedSection == Obj->end_sections()) |
| continue; |
| |
| StringRef RelSecName; |
| RelocatedSection->getName(RelSecName); |
| RelSecName = RelSecName.substr( |
| RelSecName.find_first_not_of("._")); // Skip . and _ prefixes. |
| |
| // TODO: Add support for relocations in other sections as needed. |
| // Record relocations for the debug_info and debug_line sections. |
| RelocAddrMap *Map = StringSwitch<RelocAddrMap*>(RelSecName) |
| .Case("debug_info", &InfoSection.Relocs) |
| .Case("debug_loc", &LocSection.Relocs) |
| .Case("debug_info.dwo", &InfoDWOSection.Relocs) |
| .Case("debug_line", &LineSection.Relocs) |
| .Default(0); |
| if (!Map) { |
| if (RelSecName != "debug_types") |
| continue; |
| // Find debug_types relocs by section rather than name as there are |
| // multiple, comdat grouped, debug_types sections. |
| Map = &TypesSections[*RelocatedSection].Relocs; |
| } |
| |
| if (i->begin_relocations() != i->end_relocations()) { |
| uint64_t SectionSize; |
| RelocatedSection->getSize(SectionSize); |
| for (object::relocation_iterator reloc_i = i->begin_relocations(), |
| reloc_e = i->end_relocations(); |
| reloc_i != reloc_e; reloc_i.increment(ec)) { |
| uint64_t Address; |
| reloc_i->getOffset(Address); |
| uint64_t Type; |
| reloc_i->getType(Type); |
| uint64_t SymAddr = 0; |
| // ELF relocations may need the symbol address |
| if (Obj->isELF()) { |
| object::symbol_iterator Sym = reloc_i->getSymbol(); |
| Sym->getAddress(SymAddr); |
| } |
| |
| object::RelocVisitor V(Obj->getFileFormatName()); |
| // The section address is always 0 for debug sections. |
| object::RelocToApply R(V.visit(Type, *reloc_i, 0, SymAddr)); |
| if (V.error()) { |
| SmallString<32> Name; |
| error_code ec(reloc_i->getTypeName(Name)); |
| if (ec) { |
| errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n"; |
| } |
| errs() << "error: failed to compute relocation: " |
| << Name << "\n"; |
| continue; |
| } |
| |
| if (Address + R.Width > SectionSize) { |
| errs() << "error: " << R.Width << "-byte relocation starting " |
| << Address << " bytes into section " << name << " which is " |
| << SectionSize << " bytes long.\n"; |
| continue; |
| } |
| if (R.Width > 8) { |
| errs() << "error: can't handle a relocation of more than 8 bytes at " |
| "a time.\n"; |
| continue; |
| } |
| DEBUG(dbgs() << "Writing " << format("%p", R.Value) |
| << " at " << format("%p", Address) |
| << " with width " << format("%d", R.Width) |
| << "\n"); |
| Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value))); |
| } |
| } |
| } |
| } |
| |
| DWARFContextInMemory::~DWARFContextInMemory() { |
| DeleteContainerPointers(UncompressedSections); |
| } |
| |
| void DWARFContextInMemory::anchor() { } |
