| //===-- DWARFContext.cpp --------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/DebugInfo/DWARF/DWARFContext.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/StringSwitch.h" |
| #include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h" |
| #include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h" |
| #include "llvm/DebugInfo/DWARF/DWARFUnitIndex.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; |
| |
| #define DEBUG_TYPE "dwarf" |
| |
| typedef DWARFDebugLine::LineTable DWARFLineTable; |
| typedef DILineInfoSpecifier::FileLineInfoKind FileLineInfoKind; |
| typedef DILineInfoSpecifier::FunctionNameKind FunctionNameKind; |
| |
| 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; |
| while (pubNames.isValidOffset(offset)) { |
| 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"; |
| } |
| } |
| } |
| |
| static void dumpAccelSection(raw_ostream &OS, StringRef Name, |
| const DWARFSection& Section, StringRef StringSection, |
| bool LittleEndian) { |
| DataExtractor AccelSection(Section.Data, LittleEndian, 0); |
| DataExtractor StrData(StringSection, LittleEndian, 0); |
| OS << "\n." << Name << " contents:\n"; |
| DWARFAcceleratorTable Accel(AccelSection, StrData, Section.Relocs); |
| if (!Accel.extract()) |
| return; |
| Accel.dump(OS); |
| } |
| |
| 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_AbbrevDwo) |
| if (const DWARFDebugAbbrev *D = getDebugAbbrevDWO()) { |
| OS << "\n.debug_abbrev.dwo contents:\n"; |
| D->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Info) { |
| OS << "\n.debug_info contents:\n"; |
| for (const auto &CU : compile_units()) |
| CU->dump(OS); |
| } |
| |
| if ((DumpType == DIDT_All || DumpType == DIDT_InfoDwo) && |
| getNumDWOCompileUnits()) { |
| OS << "\n.debug_info.dwo contents:\n"; |
| for (const auto &DWOCU : dwo_compile_units()) |
| DWOCU->dump(OS); |
| } |
| |
| if ((DumpType == DIDT_All || DumpType == DIDT_Types) && getNumTypeUnits()) { |
| OS << "\n.debug_types contents:\n"; |
| for (const auto &TUS : type_unit_sections()) |
| for (const auto &TU : TUS) |
| TU->dump(OS); |
| } |
| |
| if ((DumpType == DIDT_All || DumpType == DIDT_TypesDwo) && |
| getNumDWOTypeUnits()) { |
| OS << "\n.debug_types.dwo contents:\n"; |
| for (const auto &DWOTUS : dwo_type_unit_sections()) |
| for (const auto &DWOTU : DWOTUS) |
| DWOTU->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Loc) { |
| OS << "\n.debug_loc contents:\n"; |
| getDebugLoc()->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_LocDwo) { |
| OS << "\n.debug_loc.dwo contents:\n"; |
| getDebugLocDWO()->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Frames) { |
| OS << "\n.debug_frame contents:\n"; |
| getDebugFrame()->dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_Macro) { |
| OS << "\n.debug_macinfo contents:\n"; |
| getDebugMacro()->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 (const auto &CU : compile_units()) { |
| savedAddressByteSize = CU->getAddressByteSize(); |
| const auto *CUDIE = CU->getUnitDIE(); |
| if (CUDIE == nullptr) |
| continue; |
| unsigned stmtOffset = CUDIE->getAttributeValueAsSectionOffset( |
| CU.get(), DW_AT_stmt_list, -1U); |
| if (stmtOffset != -1U) { |
| DataExtractor lineData(getLineSection().Data, isLittleEndian(), |
| savedAddressByteSize); |
| DWARFDebugLine::LineTable LineTable; |
| LineTable.parse(lineData, &getLineSection().Relocs, &stmtOffset); |
| LineTable.dump(OS); |
| } |
| } |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_CUIndex) { |
| OS << "\n.debug_cu_index contents:\n"; |
| getCUIndex().dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_TUIndex) { |
| OS << "\n.debug_tu_index contents:\n"; |
| getTUIndex().dump(OS); |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) { |
| OS << "\n.debug_line.dwo contents:\n"; |
| unsigned stmtOffset = 0; |
| DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(), |
| savedAddressByteSize); |
| DWARFDebugLine::LineTable LineTable; |
| while (LineTable.Prologue.parse(lineData, &stmtOffset)) { |
| LineTable.dump(OS); |
| LineTable.clear(); |
| } |
| } |
| |
| 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_StrDwo) && |
| !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_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_StrOffsetsDwo) && |
| !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)); |
| } |
| } |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_AppleNames) |
| dumpAccelSection(OS, "apple_names", getAppleNamesSection(), |
| getStringSection(), isLittleEndian()); |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_AppleTypes) |
| dumpAccelSection(OS, "apple_types", getAppleTypesSection(), |
| getStringSection(), isLittleEndian()); |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_AppleNamespaces) |
| dumpAccelSection(OS, "apple_namespaces", getAppleNamespacesSection(), |
| getStringSection(), isLittleEndian()); |
| |
| if (DumpType == DIDT_All || DumpType == DIDT_AppleObjC) |
| dumpAccelSection(OS, "apple_objc", getAppleObjCSection(), |
| getStringSection(), isLittleEndian()); |
| } |
| |
| const DWARFUnitIndex &DWARFContext::getCUIndex() { |
| if (CUIndex) |
| return *CUIndex; |
| |
| DataExtractor CUIndexData(getCUIndexSection(), isLittleEndian(), 0); |
| |
| CUIndex = llvm::make_unique<DWARFUnitIndex>(DW_SECT_INFO); |
| CUIndex->parse(CUIndexData); |
| return *CUIndex; |
| } |
| |
| const DWARFUnitIndex &DWARFContext::getTUIndex() { |
| if (TUIndex) |
| return *TUIndex; |
| |
| DataExtractor TUIndexData(getTUIndexSection(), isLittleEndian(), 0); |
| |
| TUIndex = llvm::make_unique<DWARFUnitIndex>(DW_SECT_TYPES); |
| TUIndex->parse(TUIndexData); |
| return *TUIndex; |
| } |
| |
| const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() { |
| if (Abbrev) |
| return Abbrev.get(); |
| |
| DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0); |
| |
| Abbrev.reset(new DWARFDebugAbbrev()); |
| Abbrev->extract(abbrData); |
| return Abbrev.get(); |
| } |
| |
| const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() { |
| if (AbbrevDWO) |
| return AbbrevDWO.get(); |
| |
| DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0); |
| AbbrevDWO.reset(new DWARFDebugAbbrev()); |
| AbbrevDWO->extract(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 DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() { |
| if (LocDWO) |
| return LocDWO.get(); |
| |
| DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0); |
| LocDWO.reset(new DWARFDebugLocDWO()); |
| LocDWO->parse(LocData); |
| return LocDWO.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 DWARFDebugMacro *DWARFContext::getDebugMacro() { |
| if (Macro) |
| return Macro.get(); |
| |
| DataExtractor MacinfoData(getMacinfoSection(), isLittleEndian(), 0); |
| Macro.reset(new DWARFDebugMacro()); |
| Macro->parse(MacinfoData); |
| return Macro.get(); |
| } |
| |
| const DWARFLineTable * |
| DWARFContext::getLineTableForUnit(DWARFUnit *U) { |
| if (!Line) |
| Line.reset(new DWARFDebugLine(&getLineSection().Relocs)); |
| |
| const auto *UnitDIE = U->getUnitDIE(); |
| if (UnitDIE == nullptr) |
| return nullptr; |
| |
| unsigned stmtOffset = |
| UnitDIE->getAttributeValueAsSectionOffset(U, DW_AT_stmt_list, -1U); |
| if (stmtOffset == -1U) |
| return nullptr; // No line table for this compile unit. |
| |
| stmtOffset += U->getLineTableOffset(); |
| // See if the line table is cached. |
| if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset)) |
| return lt; |
| |
| // We have to parse it first. |
| DataExtractor lineData(U->getLineSection(), isLittleEndian(), |
| U->getAddressByteSize()); |
| return Line->getOrParseLineTable(lineData, stmtOffset); |
| } |
| |
| void DWARFContext::parseCompileUnits() { |
| CUs.parse(*this, getInfoSection()); |
| } |
| |
| void DWARFContext::parseTypeUnits() { |
| if (!TUs.empty()) |
| return; |
| for (const auto &I : getTypesSections()) { |
| TUs.emplace_back(); |
| TUs.back().parse(*this, I.second); |
| } |
| } |
| |
| void DWARFContext::parseDWOCompileUnits() { |
| DWOCUs.parseDWO(*this, getInfoDWOSection()); |
| } |
| |
| void DWARFContext::parseDWOTypeUnits() { |
| if (!DWOTUs.empty()) |
| return; |
| for (const auto &I : getTypesDWOSections()) { |
| DWOTUs.emplace_back(); |
| DWOTUs.back().parseDWO(*this, I.second); |
| } |
| } |
| |
| DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) { |
| parseCompileUnits(); |
| return CUs.getUnitForOffset(Offset); |
| } |
| |
| 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 getFunctionNameForAddress(DWARFCompileUnit *CU, uint64_t Address, |
| FunctionNameKind Kind, |
| std::string &FunctionName) { |
| if (Kind == FunctionNameKind::None) |
| return false; |
| // 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) |
| return false; |
| const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0]; |
| if (const char *Name = |
| TopFunctionDIE.getSubroutineName(InlinedChain.U, Kind)) { |
| FunctionName = Name; |
| return true; |
| } |
| return false; |
| } |
| |
| DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Spec) { |
| DILineInfo Result; |
| |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return Result; |
| getFunctionNameForAddress(CU, Address, Spec.FNKind, Result.FunctionName); |
| if (Spec.FLIKind != FileLineInfoKind::None) { |
| if (const DWARFLineTable *LineTable = getLineTableForUnit(CU)) |
| LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(), |
| Spec.FLIKind, Result); |
| } |
| return Result; |
| } |
| |
| DILineInfoTable |
| DWARFContext::getLineInfoForAddressRange(uint64_t Address, uint64_t Size, |
| DILineInfoSpecifier Spec) { |
| DILineInfoTable Lines; |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return Lines; |
| |
| std::string FunctionName = "<invalid>"; |
| getFunctionNameForAddress(CU, Address, Spec.FNKind, FunctionName); |
| |
| // If the Specifier says we don't need FileLineInfo, just |
| // return the top-most function at the starting address. |
| if (Spec.FLIKind == FileLineInfoKind::None) { |
| DILineInfo Result; |
| Result.FunctionName = FunctionName; |
| Lines.push_back(std::make_pair(Address, Result)); |
| return Lines; |
| } |
| |
| const DWARFLineTable *LineTable = getLineTableForUnit(CU); |
| |
| // 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; |
| |
| for (uint32_t RowIndex : RowVector) { |
| // Take file number and line/column from the row. |
| const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex]; |
| DILineInfo Result; |
| LineTable->getFileNameByIndex(Row.File, CU->getCompilationDir(), |
| Spec.FLIKind, Result.FileName); |
| Result.FunctionName = FunctionName; |
| Result.Line = Row.Line; |
| Result.Column = Row.Column; |
| Lines.push_back(std::make_pair(Row.Address, Result)); |
| } |
| |
| return Lines; |
| } |
| |
| DIInliningInfo |
| DWARFContext::getInliningInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Spec) { |
| DIInliningInfo InliningInfo; |
| |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return InliningInfo; |
| |
| const DWARFLineTable *LineTable = nullptr; |
| const DWARFDebugInfoEntryInlinedChain &InlinedChain = |
| CU->getInlinedChainForAddress(Address); |
| if (InlinedChain.DIEs.size() == 0) { |
| // If there is no DIE for address (e.g. it is in unavailable .dwo file), |
| // try to at least get file/line info from symbol table. |
| if (Spec.FLIKind != FileLineInfoKind::None) { |
| DILineInfo Frame; |
| LineTable = getLineTableForUnit(CU); |
| if (LineTable && |
| LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(), |
| Spec.FLIKind, Frame)) |
| InliningInfo.addFrame(Frame); |
| } |
| return InliningInfo; |
| } |
| |
| uint32_t CallFile = 0, CallLine = 0, CallColumn = 0; |
| for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) { |
| const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i]; |
| DILineInfo Frame; |
| // Get function name if necessary. |
| if (const char *Name = |
| FunctionDIE.getSubroutineName(InlinedChain.U, Spec.FNKind)) |
| Frame.FunctionName = Name; |
| if (Spec.FLIKind != FileLineInfoKind::None) { |
| if (i == 0) { |
| // For the topmost frame, initialize the line table of this |
| // compile unit and fetch file/line info from it. |
| LineTable = getLineTableForUnit(CU); |
| // For the topmost routine, get file/line info from line table. |
| if (LineTable) |
| LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(), |
| Spec.FLIKind, Frame); |
| } else { |
| // Otherwise, use call file, call line and call column from |
| // previous DIE in inlined chain. |
| if (LineTable) |
| LineTable->getFileNameByIndex(CallFile, CU->getCompilationDir(), |
| Spec.FLIKind, Frame.FileName); |
| Frame.Line = CallLine; |
| Frame.Column = CallColumn; |
| } |
| // Get call file/line/column of a current DIE. |
| if (i + 1 < n) { |
| FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine, |
| CallColumn); |
| } |
| } |
| 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(const object::ObjectFile &Obj, |
| const LoadedObjectInfo *L) |
| : IsLittleEndian(Obj.isLittleEndian()), |
| AddressSize(Obj.getBytesInAddress()) { |
| for (const SectionRef &Section : Obj.sections()) { |
| StringRef name; |
| Section.getName(name); |
| // Skip BSS and Virtual sections, they aren't interesting. |
| bool IsBSS = Section.isBSS(); |
| if (IsBSS) |
| continue; |
| bool IsVirtual = Section.isVirtual(); |
| if (IsVirtual) |
| continue; |
| StringRef data; |
| |
| section_iterator RelocatedSection = Section.getRelocatedSection(); |
| // Try to obtain an already relocated version of this section. |
| // Else use the unrelocated section from the object file. We'll have to |
| // apply relocations ourselves later. |
| if (!L || !L->getLoadedSectionContents(*RelocatedSection,data)) |
| Section.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; |
| UncompressedSections.resize(UncompressedSections.size() + 1); |
| if (zlib::uncompress(data, UncompressedSections.back(), OriginalSize) != |
| zlib::StatusOK) { |
| UncompressedSections.pop_back(); |
| continue; |
| } |
| // Make data point to uncompressed section contents and save its contents. |
| name = name.substr(1); |
| data = UncompressedSections.back(); |
| } |
| |
| StringRef *SectionData = |
| 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_macinfo", &MacinfoSection) |
| .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_loc.dwo", &LocDWOSection.Data) |
| .Case("debug_line.dwo", &LineDWOSection.Data) |
| .Case("debug_str.dwo", &StringDWOSection) |
| .Case("debug_str_offsets.dwo", &StringOffsetDWOSection) |
| .Case("debug_addr", &AddrSection) |
| .Case("apple_names", &AppleNamesSection.Data) |
| .Case("apple_types", &AppleTypesSection.Data) |
| .Case("apple_namespaces", &AppleNamespacesSection.Data) |
| .Case("apple_namespac", &AppleNamespacesSection.Data) |
| .Case("apple_objc", &AppleObjCSection.Data) |
| .Case("debug_cu_index", &CUIndexSection) |
| .Case("debug_tu_index", &TUIndexSection) |
| // Any more debug info sections go here. |
| .Default(nullptr); |
| if (SectionData) { |
| *SectionData = 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[Section].Data = data; |
| } else if (name == "debug_types.dwo") { |
| TypesDWOSections[Section].Data = data; |
| } |
| |
| if (RelocatedSection == Obj.section_end()) |
| continue; |
| |
| StringRef RelSecName; |
| StringRef RelSecData; |
| RelocatedSection->getName(RelSecName); |
| |
| // If the section we're relocating was relocated already by the JIT, |
| // then we used the relocated version above, so we do not need to process |
| // relocations for it now. |
| if (L && L->getLoadedSectionContents(*RelocatedSection,RelSecData)) |
| continue; |
| |
| // In Mach-o files, the relocations do not need to be applied if |
| // there is no load offset to apply. The value read at the |
| // relocation point already factors in the section address |
| // (actually applying the relocations will produce wrong results |
| // as the section address will be added twice). |
| if (!L && isa<MachOObjectFile>(&Obj)) |
| continue; |
| |
| 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) |
| .Case("apple_names", &AppleNamesSection.Relocs) |
| .Case("apple_types", &AppleTypesSection.Relocs) |
| .Case("apple_namespaces", &AppleNamespacesSection.Relocs) |
| .Case("apple_namespac", &AppleNamespacesSection.Relocs) |
| .Case("apple_objc", &AppleObjCSection.Relocs) |
| .Default(nullptr); |
| if (!Map) { |
| // Find debug_types relocs by section rather than name as there are |
| // multiple, comdat grouped, debug_types sections. |
| if (RelSecName == "debug_types") |
| Map = &TypesSections[*RelocatedSection].Relocs; |
| else if (RelSecName == "debug_types.dwo") |
| Map = &TypesDWOSections[*RelocatedSection].Relocs; |
| else |
| continue; |
| } |
| |
| if (Section.relocation_begin() != Section.relocation_end()) { |
| uint64_t SectionSize = RelocatedSection->getSize(); |
| for (const RelocationRef &Reloc : Section.relocations()) { |
| uint64_t Address = Reloc.getOffset(); |
| uint64_t Type = Reloc.getType(); |
| uint64_t SymAddr = 0; |
| uint64_t SectionLoadAddress = 0; |
| object::symbol_iterator Sym = Reloc.getSymbol(); |
| object::section_iterator RSec = Obj.section_end(); |
| |
| // First calculate the address of the symbol or section as it appears |
| // in the objct file |
| if (Sym != Obj.symbol_end()) { |
| ErrorOr<uint64_t> SymAddrOrErr = Sym->getAddress(); |
| if (std::error_code EC = SymAddrOrErr.getError()) { |
| errs() << "error: failed to compute symbol address: " |
| << EC.message() << '\n'; |
| continue; |
| } |
| SymAddr = *SymAddrOrErr; |
| // Also remember what section this symbol is in for later |
| RSec = *Sym->getSection(); |
| } else if (auto *MObj = dyn_cast<MachOObjectFile>(&Obj)) { |
| // MachO also has relocations that point to sections and |
| // scattered relocations. |
| auto RelocInfo = MObj->getRelocation(Reloc.getRawDataRefImpl()); |
| if (MObj->isRelocationScattered(RelocInfo)) { |
| // FIXME: it's not clear how to correctly handle scattered |
| // relocations. |
| continue; |
| } else { |
| RSec = MObj->getRelocationSection(Reloc.getRawDataRefImpl()); |
| SymAddr = RSec->getAddress(); |
| } |
| } |
| |
| // If we are given load addresses for the sections, we need to adjust: |
| // SymAddr = (Address of Symbol Or Section in File) - |
| // (Address of Section in File) + |
| // (Load Address of Section) |
| if (L != nullptr && RSec != Obj.section_end()) { |
| // RSec is now either the section being targeted or the section |
| // containing the symbol being targeted. In either case, |
| // we need to perform the same computation. |
| StringRef SecName; |
| RSec->getName(SecName); |
| // llvm::dbgs() << "Name: '" << SecName |
| // << "', RSec: " << RSec->getRawDataRefImpl() |
| // << ", Section: " << Section.getRawDataRefImpl() << "\n"; |
| SectionLoadAddress = L->getSectionLoadAddress(*RSec); |
| if (SectionLoadAddress != 0) |
| SymAddr += SectionLoadAddress - RSec->getAddress(); |
| } |
| |
| object::RelocVisitor V(Obj); |
| object::RelocToApply R(V.visit(Type, Reloc, SymAddr)); |
| if (V.error()) { |
| SmallString<32> Name; |
| Reloc.getTypeName(Name); |
| 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))); |
| } |
| } |
| } |
| } |
| |
| void DWARFContextInMemory::anchor() { } |
