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-rw-r--r--lib/DebugInfo/DWARF/DWARFContext.cpp696
1 files changed, 696 insertions, 0 deletions
diff --git a/lib/DebugInfo/DWARF/DWARFContext.cpp b/lib/DebugInfo/DWARF/DWARFContext.cpp
new file mode 100644
index 0000000..3b42700
--- /dev/null
+++ b/lib/DebugInfo/DWARF/DWARFContext.cpp
@@ -0,0 +1,696 @@
+//===-- 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/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);
+ }
+
+ 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();
+ unsigned stmtOffset =
+ CU->getCompileUnitDIE()->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_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 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 DWARFLineTable *
+DWARFContext::getLineTableForUnit(DWARFUnit *cu) {
+ if (!Line)
+ Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
+
+ unsigned stmtOffset =
+ cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
+ cu, DW_AT_stmt_list, -1U);
+ if (stmtOffset == -1U)
+ return nullptr; // 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() {
+ CUs.parse(*this, getInfoSection());
+}
+
+void DWARFContext::parseTypeUnits() {
+ if (!TUs.empty())
+ return;
+ for (const auto &I : getTypesSections()) {
+ TUs.push_back(DWARFUnitSection<DWARFTypeUnit>());
+ 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.push_back(DWARFUnitSection<DWARFTypeUnit>());
+ 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)
+ : 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.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_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)
+ // 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;
+ }
+
+ section_iterator RelocatedSection = Section.getRelocatedSection();
+ if (RelocatedSection == Obj.section_end())
+ 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)
+ .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(Address);
+ uint64_t Type;
+ Reloc.getType(Type);
+ uint64_t SymAddr = 0;
+ object::symbol_iterator Sym = Reloc.getSymbol();
+ if (Sym != Obj.symbol_end())
+ Sym->getAddress(SymAddr);
+
+ object::RelocVisitor V(Obj);
+ object::RelocToApply R(V.visit(Type, Reloc, SymAddr));
+ if (V.error()) {
+ SmallString<32> Name;
+ std::error_code ec(Reloc.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)));
+ }
+ }
+ }
+}
+
+void DWARFContextInMemory::anchor() { }
generated by cgit v1.1 at 2024-12-22 11:11:05 +0000