[lld] [lld][ELF] Implement merged .debug_names section. (PR #86508)
via llvm-commits
llvm-commits at lists.llvm.org
Mon Mar 25 07:36:31 PDT 2024
https://github.com/cmtice created https://github.com/llvm/llvm-project/pull/86508
Update LLD to be able to generate a single merged .debug_names section (rather than a set of appended sections). Option is controlled by a new flag, --debug-names. Does not handle type units yet (coming soon).
>From 1b844ae7307d4d72a8a9e9b48d7c96618640bb12 Mon Sep 17 00:00:00 2001
From: Caroline Tice <cmtice at google.com>
Date: Mon, 25 Mar 2024 00:00:27 -0700
Subject: [PATCH] [lld][ELF] Implement merged .debug_names section.
Update LLD to be able to generate a single merged .debug_names section (rather
than a set of appended sections). Option is controlled by a new flag, --debug-names.
Does not handle type units yet (coming soon).
---
lld/ELF/Config.h | 1 +
lld/ELF/DWARF.cpp | 1 +
lld/ELF/DWARF.h | 5 +
lld/ELF/Driver.cpp | 3 +
lld/ELF/Options.td | 4 +
lld/ELF/SyntheticSections.cpp | 761 ++++++++++++++++++
lld/ELF/SyntheticSections.h | 134 +++
lld/ELF/Writer.cpp | 3 +
lld/docs/ld.lld.1 | 4 +
lld/test/ELF/Inputs/debug-names-2.s | 191 +++++
.../ELF/Inputs/debug-names-parent-idx-2.s | 347 ++++++++
lld/test/ELF/debug-names-bad-aug-string.s | 189 +++++
lld/test/ELF/debug-names-bad-die-idx-sizes.s | 151 ++++
lld/test/ELF/debug-names-bad-name-count.s | 154 ++++
lld/test/ELF/debug-names-bad-offsets-sizes.s | 153 ++++
lld/test/ELF/debug-names-bad-version.s | 173 ++++
lld/test/ELF/debug-names-invalid-attribute.s | 179 ++++
lld/test/ELF/debug-names-parent-idx.s | 549 +++++++++++++
lld/test/ELF/debug-names.s | 294 +++++++
19 files changed, 3296 insertions(+)
create mode 100644 lld/test/ELF/Inputs/debug-names-2.s
create mode 100644 lld/test/ELF/Inputs/debug-names-parent-idx-2.s
create mode 100644 lld/test/ELF/debug-names-bad-aug-string.s
create mode 100644 lld/test/ELF/debug-names-bad-die-idx-sizes.s
create mode 100644 lld/test/ELF/debug-names-bad-name-count.s
create mode 100644 lld/test/ELF/debug-names-bad-offsets-sizes.s
create mode 100644 lld/test/ELF/debug-names-bad-version.s
create mode 100644 lld/test/ELF/debug-names-invalid-attribute.s
create mode 100644 lld/test/ELF/debug-names-parent-idx.s
create mode 100644 lld/test/ELF/debug-names.s
diff --git a/lld/ELF/Config.h b/lld/ELF/Config.h
index bb3608da80b21f..1a7c6dafe17e18 100644
--- a/lld/ELF/Config.h
+++ b/lld/ELF/Config.h
@@ -228,6 +228,7 @@ struct Config {
bool cref;
llvm::SmallVector<std::pair<llvm::GlobPattern, uint64_t>, 0>
deadRelocInNonAlloc;
+ bool debugNames;
bool demangle = true;
bool dependentLibraries;
bool disableVerify;
diff --git a/lld/ELF/DWARF.cpp b/lld/ELF/DWARF.cpp
index ac28aa8c7ca6e0..03fac65754f020 100644
--- a/lld/ELF/DWARF.cpp
+++ b/lld/ELF/DWARF.cpp
@@ -40,6 +40,7 @@ template <class ELFT> LLDDwarfObj<ELFT>::LLDDwarfObj(ObjFile<ELFT> *obj) {
.Case(".debug_gnu_pubtypes", &gnuPubtypesSection)
.Case(".debug_line", &lineSection)
.Case(".debug_loclists", &loclistsSection)
+ .Case(".debug_names", &debugNamesSection)
.Case(".debug_ranges", &rangesSection)
.Case(".debug_rnglists", &rnglistsSection)
.Case(".debug_str_offsets", &strOffsetsSection)
diff --git a/lld/ELF/DWARF.h b/lld/ELF/DWARF.h
index 1b9a3e3f77943b..e1a830279b54d0 100644
--- a/lld/ELF/DWARF.h
+++ b/lld/ELF/DWARF.h
@@ -68,6 +68,10 @@ template <class ELFT> class LLDDwarfObj final : public llvm::DWARFObject {
return gnuPubtypesSection;
}
+ const LLDDWARFSection &getNamesSection() const override {
+ return debugNamesSection;
+ }
+
StringRef getFileName() const override { return ""; }
StringRef getAbbrevSection() const override { return abbrevSection; }
StringRef getStrSection() const override { return strSection; }
@@ -95,6 +99,7 @@ template <class ELFT> class LLDDwarfObj final : public llvm::DWARFObject {
LLDDWARFSection strOffsetsSection;
LLDDWARFSection lineSection;
LLDDWARFSection addrSection;
+ LLDDWARFSection debugNamesSection;
StringRef abbrevSection;
StringRef strSection;
StringRef lineStrSection;
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index 7257ebd0fac994..9a300a54e122bd 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -441,6 +441,8 @@ static void checkOptions() {
error("-r and -pie may not be used together");
if (config->exportDynamic)
error("-r and --export-dynamic may not be used together");
+ if (config->debugNames)
+ error("-r and --debug-names may not be used together");
}
if (config->executeOnly) {
@@ -1231,6 +1233,7 @@ static void readConfigs(opt::InputArgList &args) {
config->cref = args.hasArg(OPT_cref);
config->optimizeBBJumps =
args.hasFlag(OPT_optimize_bb_jumps, OPT_no_optimize_bb_jumps, false);
+ config->debugNames = args.hasFlag(OPT_debug_names, OPT_no_debug_names, false);
config->demangle = args.hasFlag(OPT_demangle, OPT_no_demangle, true);
config->dependencyFile = args.getLastArgValue(OPT_dependency_file);
config->dependentLibraries = args.hasFlag(OPT_dependent_libraries, OPT_no_dependent_libraries, true);
diff --git a/lld/ELF/Options.td b/lld/ELF/Options.td
index c5e95d0d25c1ae..d470646ed0eeef 100644
--- a/lld/ELF/Options.td
+++ b/lld/ELF/Options.td
@@ -153,6 +153,10 @@ def : Flag<["--"], "no-color-diagnostics">, Alias<color_diagnostics>, AliasArgs<
def cref: FF<"cref">,
HelpText<"Output cross reference table. If -Map is specified, print to the map file">;
+defm debug_names: BB<"debug-names",
+ "Generate a merged .debug_names section",
+ "Do not generate a merged .debug_names section (default)">;
+
defm demangle: B<"demangle",
"Demangle symbol names (default)",
"Do not demangle symbol names">;
diff --git a/lld/ELF/SyntheticSections.cpp b/lld/ELF/SyntheticSections.cpp
index f924756ddddfcd..6b84f4d806f356 100644
--- a/lld/ELF/SyntheticSections.cpp
+++ b/lld/ELF/SyntheticSections.cpp
@@ -14,6 +14,7 @@
//===----------------------------------------------------------------------===//
#include "SyntheticSections.h"
+
#include "Config.h"
#include "DWARF.h"
#include "EhFrame.h"
@@ -34,7 +35,9 @@
#include "llvm/ADT/StringExtras.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugPubTable.h"
+#include "llvm/Support/DJB.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/Parallel.h"
@@ -2690,6 +2693,759 @@ static uint32_t computeGdbHash(StringRef s) {
return h;
}
+DebugNamesSection::DebugNamesSection()
+ : SyntheticSection(0, SHT_PROGBITS, 1, ".debug_names") {}
+
+template <class ELFT, class RelTy>
+void DebugNamesSection::getNameRelocsImpl(
+ InputSection *sec, ArrayRef<RelTy> rels,
+ llvm::DenseMap<uint32_t, uint32_t> &relocs) {
+ for (auto &rel : rels) {
+ Symbol &sym = sec->getFile<ELFT>()->getRelocTargetSym(rel);
+ relocs[rel.r_offset] = sym.getVA(getAddend<ELFT>(rel));
+ }
+}
+
+template <class ELFT>
+void DebugNamesSection::getNameRelocs(
+ InputSectionBase *base, llvm::DenseMap<uint32_t, uint32_t> &relocs) {
+ auto *sec = cast<InputSection>(base);
+ const RelsOrRelas<ELFT> rels = sec->template relsOrRelas<ELFT>();
+ if (rels.areRelocsRel())
+ getNameRelocsImpl<ELFT>(sec, rels.rels, relocs);
+ else
+ getNameRelocsImpl<ELFT>(sec, rels.relas, relocs);
+}
+
+void DebugNamesSection::writeTo(uint8_t *buf) { invokeELFT(writeToImpl, buf); }
+
+template <class ELFT> void DebugNamesSection::writeToImpl(uint8_t *buf) {
+ SmallVector<uint32_t, 0> mergedCuOffsets;
+ SmallVector<uint32_t, 0> mergedTuOffsets;
+ llvm::DenseMap<uint32_t, uint32_t> strOffsets;
+ SmallVector<llvm::DenseMap<uint32_t, uint32_t>, 0> chunksRelocs;
+ chunksRelocs.reserve(numChunks);
+
+ for (size_t i = 0; i < numChunks; ++i) {
+ DebugNamesOutputChunk &chunk = outputChunks[i];
+ InputSectionBase *base = inputDebugNamesSections[i];
+ llvm::DenseMap<uint32_t, uint32_t> relocs;
+ getNameRelocs<ELFT>(base, relocs);
+ chunksRelocs.push_back(std::move(relocs));
+
+ // Update CuOffsets list with new data
+ for (uint32_t cuOffset : chunk.compilationUnits)
+ mergedCuOffsets.push_back(chunk.sec->outSecOff + cuOffset);
+
+ // TODO: Update TuOffsets list with new data
+ }
+
+ // Update the entries with the relocated string offsets.
+ for (auto &stringEntry : mergedEntries) {
+ uint32_t oldOffset = stringEntry.stringOffsetOffset;
+ uint32_t idx = stringEntry.chunkIdx;
+ stringEntry.relocatedEntryOffset = chunksRelocs[idx][oldOffset];
+ }
+
+ // Write out bytes for merged section.
+
+ // Write the header.
+ endian::write32<ELFT::TargetEndianness>(buf + 0, mergedHdr.UnitLength);
+ endian::write16<ELFT::TargetEndianness>(buf + 4, mergedHdr.Version);
+ endian::write32<ELFT::TargetEndianness>(buf + 8, mergedHdr.CompUnitCount);
+ endian::write32<ELFT::TargetEndianness>(buf + 12,
+ mergedHdr.LocalTypeUnitCount);
+ endian::write32<ELFT::TargetEndianness>(buf + 16,
+ mergedHdr.ForeignTypeUnitCount);
+ endian::write32<ELFT::TargetEndianness>(buf + 20, mergedHdr.BucketCount);
+ endian::write32<ELFT::TargetEndianness>(buf + 24, mergedHdr.NameCount);
+ endian::write32<ELFT::TargetEndianness>(buf + 28, mergedHdr.AbbrevTableSize);
+ endian::write32<ELFT::TargetEndianness>(buf + 32,
+ mergedHdr.AugmentationStringSize);
+ buf += 36;
+ memcpy(buf, mergedHdr.AugmentationString.c_str(), 8);
+ buf += 8;
+
+ // Write the CU list.
+ for (uint32_t offset : mergedCuOffsets) {
+ endian::write32<ELFT::TargetEndianness>(buf + 0, offset);
+ buf += 4;
+ }
+
+ // Write the local TU list.
+ // TODO: Fix this, once we get everything working without TUs.
+ if (mergedHdr.LocalTypeUnitCount != 0)
+ warn(".debug_names: type units are not handled in merged index");
+
+ // Write the foreign TU list.
+ // Currently LLVM does not emit foreign type units, so there should
+ // be nothing here to emit.
+ // TODO: Fix this, once we get everything working wtihout TUs.
+ if (mergedHdr.ForeignTypeUnitCount != 0)
+ warn(".debug_names: type units are not handled in merged index");
+
+ // Write the hash table.
+ // ... Write the buckets
+ uint32_t idx = 1;
+ for (const auto &bucket : bucketList) {
+ if (!bucket.empty())
+ endian::write32<ELFT::TargetEndianness>(buf + 0, idx);
+ idx += bucket.size();
+ buf += 4;
+ }
+
+ // ...Write the hashes
+ for (const auto &bucket : bucketList) {
+ for (const auto &entry : bucket) {
+ uint32_t hashValue = entry->hashValue;
+ endian::write32<ELFT::TargetEndianness>(buf + 0, hashValue);
+ buf += 4;
+ }
+ }
+
+ // Write the string offsets.
+ for (const auto &entry : mergedEntries) {
+ endian::write32<ELFT::TargetEndianness>(buf + 0,
+ entry.relocatedEntryOffset);
+ buf += 4;
+ }
+
+ // Write the entry offsets.
+ for (const auto &entry : mergedEntries) {
+ endian::write32<ELFT::TargetEndianness>(buf + 0, entry.entryOffset);
+ buf += 4;
+ }
+
+ // Write the abbrev table.
+ for (const auto *abbrev : mergedAbbrevTable) {
+ size_t uleb_size = encodeULEB128(abbrev->code, buf);
+ buf += uleb_size;
+ uleb_size = encodeULEB128(abbrev->tag, buf);
+ buf += uleb_size;
+ for (auto attr : abbrev->attributes) {
+ uleb_size = encodeULEB128(attr.Index, buf);
+ buf += uleb_size;
+ uleb_size = encodeULEB128(attr.Form, buf);
+ buf += uleb_size;
+ }
+ endian::write16<ELFT::TargetEndianness>(buf + 0, 0); // attribute sentinels.
+ buf += 2;
+ }
+ *buf++ = 0; // abbrev table sentinel
+
+ // Write the entry pool.
+ for (const auto &stringEntry : mergedEntries) {
+ // Write all the entries for the string.
+ size_t uleb_size;
+ for (const auto &entry : stringEntry.indexEntries) {
+ uleb_size = encodeULEB128(entry->abbrevCode, buf);
+ buf += uleb_size;
+ for (const auto &value : entry->attrValues) {
+ if (value.attrSize > 0) {
+ endian::write32<ELFT::TargetEndianness>(buf + 0, value.attrValue);
+ buf += value.attrSize;
+ }
+ }
+ }
+ *buf++ = 0; // Entry sentinel
+ }
+}
+
+bool DebugNamesSection::isNeeded() const { return numChunks > 0; }
+
+template <class ELFT>
+static void
+readCompileUnitOffsets(struct DebugNamesSection::DebugNamesSectionData &secData,
+ DebugNamesSection::DebugNamesInputChunk &inputChunk,
+ DebugNamesSection::DebugNamesOutputChunk &outputChunk,
+ llvm::DWARFDataExtractor &namesExtractor) {
+ uint64_t offset = secData.locs.CUsBase;
+ uint64_t *offsetPtr = &offset;
+ for (size_t i = 0; i < secData.hdr.CompUnitCount; ++i) {
+ llvm::Error err = llvm::Error::success();
+ uint32_t value = namesExtractor.getU32(offsetPtr, &err);
+ if (err)
+ errorOrWarn(toString(inputChunk.namesSection->sec) +
+ ": error reading CU offsets: " + toString(std::move(err)));
+ else
+ outputChunk.compilationUnits.push_back(value);
+ }
+}
+
+template <class ELFT>
+static void
+readEntryOffsets(struct DebugNamesSection::DebugNamesSectionData &secData,
+ DebugNamesSection::DebugNamesInputChunk &chunk,
+ llvm::DWARFDataExtractor &namesExtractor) {
+ secData.entryOffsets = std::make_unique<uint32_t[]>(secData.hdr.NameCount);
+ if (secData.locs.EntryOffsetsBase >= namesExtractor.getData().size())
+ errorOrWarn(toString(chunk.namesSection->sec) +
+ ": invalid entry offsets input");
+
+ uint64_t offset = secData.locs.EntryOffsetsBase;
+ uint64_t *offsetPtr = &offset;
+ for (size_t i = 0; i < secData.hdr.NameCount; ++i) {
+ llvm::Error err = llvm::Error::success();
+ uint32_t value = namesExtractor.getU32(offsetPtr, &err);
+ if (err)
+ errorOrWarn(toString(chunk.namesSection->sec) +
+ ": error reading entry offsets: " + toString(std::move(err)));
+ else
+ secData.entryOffsets.get()[i] = value;
+ }
+}
+
+template <class ELFT>
+static void readAttributeValues(
+ SmallVector<DebugNamesSection::AttrValueData, 3> &values,
+ DebugNamesSection::DebugNamesInputChunk &chunk, uint64_t &offset,
+ struct DebugNamesSection::DebugNamesSectionData &secData,
+ int32_t &parentOffset, llvm::DWARFDataExtractor &namesExtractor,
+ const llvm::DWARFDebugNames::Abbrev &abbrev) {
+ const LLDDWARFSection &namesSection = *chunk.namesSection;
+ uint64_t *offsetPtr = &offset;
+ DebugNamesSection::AttrValueData cuOrTuAttr = {0, 0};
+ for (auto attr : abbrev.Attributes) {
+ llvm::Error err = llvm::Error::success();
+ DebugNamesSection::AttrValueData newAttr;
+ uint32_t value;
+ switch (attr.Form) {
+ case DW_FORM_flag_present: {
+ // Currently only DW_IDX_parent attributes (in .debug_names) can
+ // have this form. This form does not have a real value (nothing is
+ // emitted for it).
+ break;
+ }
+ case DW_FORM_data1:
+ case DW_FORM_ref1: {
+ newAttr.attrValue = namesExtractor.getU8(offsetPtr, &err);
+ newAttr.attrSize = 1;
+ break;
+ }
+ case DW_FORM_data2:
+ case DW_FORM_ref2: {
+ value = namesExtractor.getU16(offsetPtr, &err);
+ newAttr.attrValue = value;
+ newAttr.attrSize = 2;
+ break;
+ }
+ case DW_FORM_data4:
+ case DW_FORM_ref4: {
+ value = namesExtractor.getU32(offsetPtr, &err);
+ newAttr.attrValue = value;
+ newAttr.attrSize = 4;
+ if (attr.Index == dwarf::DW_IDX_parent)
+ parentOffset = value + secData.locs.EntriesBase;
+ break;
+ }
+ case DW_FORM_data8:
+ case DW_FORM_ref8:
+ case DW_FORM_ref_sig8: {
+ value = namesExtractor.getU64(offsetPtr, &err);
+ newAttr.attrValue = value;
+ newAttr.attrSize = 8;
+ break;
+ }
+ default: {
+ errorOrWarn(toString(namesSection.sec) +
+ Twine(": unrecognized form encoding ") + Twine(attr.Form) +
+ " in .debug_names abbrev table");
+ break;
+ }
+ }
+ if (err)
+ errorOrWarn(
+ toString(namesSection.sec) +
+ ": error while reading attributes: " + toString(std::move(err)));
+ if (attr.Index == DW_IDX_compile_unit || attr.Index == DW_IDX_type_unit)
+ // Save it to put it at the end of the attributes list.
+ cuOrTuAttr = newAttr;
+ else if (attr.Form != DW_FORM_flag_present)
+ values.push_back(newAttr);
+ }
+
+ // Make sure the CU or TU index attribute is the last one in the list.
+ values.push_back(cuOrTuAttr);
+}
+
+template <class ELFT>
+static void readEntry(DebugNamesSection::NamedEntry &stringEntry,
+ DebugNamesSection::DebugNamesInputChunk &chunk,
+ DebugNamesSection::DebugNamesSectionData &secData,
+ llvm::DWARFDataExtractor &namesExtractor,
+ const llvm::DWARFDebugNames::NameIndex &ni) {
+ std::unique_ptr<LLDDWARFSection> &namesSection = chunk.namesSection;
+ uint64_t offset = stringEntry.entryOffset;
+ // Each entry ends with a zero 'sentinel' value
+ while (offset < namesSection->Data.size() &&
+ namesSection->Data[offset] != 0) {
+ // Read & store all entries (for the same string)
+ auto entry = std::make_unique<DebugNamesSection::IndexEntry>();
+ entry->poolOffset = offset;
+ llvm::Error err = llvm::Error::success();
+ uint64_t ulebValue = namesExtractor.getULEB128(&offset, &err);
+ if (err)
+ errorOrWarn(toString(chunk.namesSection->sec) +
+ ": error reading entry: " + toString(std::move(err)));
+ entry->abbrevCode = static_cast<uint32_t>(ulebValue);
+ const auto &abbrevs = ni.getAbbrevs();
+ auto abbrevIt = abbrevs.find_as(entry->abbrevCode);
+ if (abbrevIt != abbrevs.end()) {
+ const llvm::DWARFDebugNames::Abbrev &abbrev = *abbrevIt;
+ readAttributeValues<ELFT>(entry->attrValues, chunk, offset, secData,
+ entry->parentOffset, namesExtractor, abbrev);
+ stringEntry.indexEntries.push_back(std::move(entry));
+ }
+ }
+ if (offset >= namesSection->Data.size())
+ errorOrWarn(toString(chunk.namesSection->sec) +
+ ": encountered unexpected end of section while reading entry");
+}
+
+template <class ELFT>
+static void
+readEntries(struct DebugNamesSection::DebugNamesSectionData &secData,
+ DebugNamesSection::DebugNamesInputChunk &chunk,
+ llvm::DWARFDataExtractor &namesExtractor,
+ llvm::DataExtractor &strExtractor,
+ const llvm::DWARFDebugNames::NameIndex &ni) {
+ // Temporary map from entry offsets to address (pointer) of entry with that
+ // offset; used to find parent entries quickly.
+ DenseMap<uint32_t, DebugNamesSection::IndexEntry *> offsetMap;
+ // Reserve sizes for this chunk's hashes & namedEntries.
+ chunk.hashValues.reserve(secData.hdr.NameCount);
+ secData.namedEntries.reserve(secData.hdr.NameCount);
+ // Calculate the Entry Offsets, create initial records.
+ for (uint32_t i = 0; i < secData.hdr.NameCount; ++i) {
+ // Get string value
+ DebugNamesSection::NamedEntry stringEntry;
+ stringEntry.entryOffset =
+ secData.locs.EntriesBase + secData.entryOffsets[i];
+ uint64_t strOffsetOffset =
+ secData.locs.StringOffsetsBase + i * secData.dwarfSize;
+ stringEntry.stringOffsetOffset = strOffsetOffset;
+ uint64_t strOffset =
+ namesExtractor.getRelocatedValue(secData.dwarfSize, &strOffsetOffset);
+ StringRef name = strExtractor.getCStrRef(&strOffset);
+ stringEntry.name = name.data();
+ // Calculate hash
+ stringEntry.hashValue = caseFoldingDjbHash(name);
+ chunk.hashValues.push_back(stringEntry.hashValue);
+ // Read String Entry
+ readEntry<ELFT>(stringEntry, chunk, secData, namesExtractor, ni);
+ // Add index entries & offsets to our temporary map
+ for (const auto &entry : stringEntry.indexEntries)
+ offsetMap[entry->poolOffset] = entry.get();
+ secData.namedEntries.push_back(std::move(stringEntry));
+ }
+ // Find/assign pointers to any 'real' parent entries (needed to find correct
+ // parent entry offsets in merged data).
+ for (auto &stringEntry : secData.namedEntries)
+ for (auto &entry : stringEntry.indexEntries)
+ if (entry->parentOffset != -1)
+ entry->parentEntry = offsetMap[entry->parentOffset];
+}
+
+static uint16_t computeDebugNamesHeaderSize() {
+ // Size of the .debug_names section header, in bytes, for DWARF32:
+ uint16_t size = /* unit length */ 4 +
+ /* version */ 2 +
+ /* padding */ 2 +
+ /* CU count */ 4 +
+ /* TU count */ 4 +
+ /* Foreign TU count */ 4 +
+ /* Bucket Count */ 4 +
+ /* Name Count */ 4 +
+ /* Abbrev table size */ 4 +
+ /* Augmentation string size */ 4 +
+ /* augmentation string */ 8;
+ return size;
+}
+
+template <class ELFT>
+static void collectDebugNamesSectionData(
+ DebugNamesSection::DebugNamesInputChunk &chunk,
+ DebugNamesSection::DebugNamesOutputChunk &outputChunk,
+ llvm::DWARFDataExtractor &namesExtractor,
+ llvm::DataExtractor &strExtractor) {
+ for (const auto &ni : *chunk.debugNamesData) {
+ DebugNamesSection::DebugNamesSectionData secData;
+ secData.hdr = ni.getHeader();
+ if (secData.hdr.Format != DwarfFormat::DWARF32)
+ errorOrWarn(toString(chunk.namesSection->sec) + ": unsupported DWARF64");
+ secData.dwarfSize = dwarf::getDwarfOffsetByteSize(DwarfFormat::DWARF32);
+ secData.hdrSize = computeDebugNamesHeaderSize();
+ if (secData.hdr.Version != 5)
+ errorOrWarn(toString(chunk.namesSection->sec) + ": unsupported version");
+ findDebugNamesOffsets(secData.locs, secData.hdrSize, secData.hdr.Format,
+ secData.hdr);
+ readCompileUnitOffsets<ELFT>(secData, chunk, outputChunk, namesExtractor);
+ readEntryOffsets<ELFT>(secData, chunk, namesExtractor);
+ readEntries<ELFT>(secData, chunk, namesExtractor, strExtractor, ni);
+ chunk.sectionsData.push_back(std::move(secData));
+ }
+}
+
+void DebugNamesSection::collectMergedCounts(
+ MutableArrayRef<DebugNamesInputChunk> &inputChunks) {
+ SmallVector<uint32_t, 0> tmpMergedCuOffsets;
+
+ mergedHdr.CompUnitCount = 0;
+ mergedHdr.LocalTypeUnitCount = 0;
+ mergedHdr.ForeignTypeUnitCount = 0;
+ mergedHdr.Version = 5;
+ mergedHdr.Format = DwarfFormat::DWARF32;
+ mergedHdr.AugmentationStringSize = 0;
+
+ for (size_t i = 0; i < numChunks; ++i) {
+ DebugNamesInputChunk &inputChunk = inputChunks[i];
+ DebugNamesOutputChunk &outputChunk = outputChunks[i];
+ inputChunk.baseCuOffsetIdx = tmpMergedCuOffsets.size();
+ for (uint32_t cuOffset : outputChunk.compilationUnits)
+ tmpMergedCuOffsets.push_back(outputChunk.sec->outSecOff + cuOffset);
+ for (const DebugNamesSectionData &data : inputChunk.sectionsData) {
+ mergedHdr.CompUnitCount += data.hdr.CompUnitCount;
+ mergedHdr.LocalTypeUnitCount += data.hdr.LocalTypeUnitCount;
+ mergedHdr.ForeignTypeUnitCount += data.hdr.ForeignTypeUnitCount;
+ // Set & check the Augmentation String.
+ if (mergedHdr.AugmentationStringSize == 0) {
+ mergedHdr.AugmentationStringSize = data.hdr.AugmentationStringSize;
+ mergedHdr.AugmentationString = data.hdr.AugmentationString;
+ } else if ((mergedHdr.AugmentationStringSize !=
+ data.hdr.AugmentationStringSize) ||
+ (mergedHdr.AugmentationString !=
+ data.hdr.AugmentationString)) {
+ // There are conflicting augmentation strings, so it's best for the
+ // merged index to not use an augmentation string.
+ StringRef emptyString = " ";
+ mergedHdr.AugmentationStringSize = 8;
+ mergedHdr.AugmentationString = emptyString;
+ }
+ }
+ }
+}
+
+void DebugNamesSection::Abbrev::Profile(llvm::FoldingSetNodeID &id) const {
+ id.AddInteger(tag);
+ for (const DWARFDebugNames::AttributeEncoding &attr : attributes) {
+ id.AddInteger(attr.Index);
+ id.AddInteger(attr.Form);
+ }
+}
+
+std::pair<uint8_t, dwarf::Form> DebugNamesSection::getMergedCuSizeData() {
+ // Once we've merged all the CU offsets into a single list, the original
+ // DWARF form/size (often 1 byte) may be too small to hold indices to all
+ // the offsets. Here we calculate what the right form/size needs to be for
+ // the merged index.
+ uint8_t size;
+ dwarf::Form form;
+ // TODO: Investigate possibly using llvm::DIEInteger::BestForm here
+ if (mergedHdr.CompUnitCount > 0xffffffff) {
+ form = DW_FORM_data8;
+ size = 8;
+ } else if (mergedHdr.CompUnitCount > 0xffff) {
+ form = DW_FORM_data4;
+ size = 4;
+ } else if (mergedHdr.CompUnitCount > 0xff) {
+ form = DW_FORM_data2;
+ size = 2;
+ } else {
+ form = DW_FORM_data1;
+ size = 1;
+ }
+
+ return {size, form};
+}
+
+void DebugNamesSection::getMergedAbbrevTable(
+ MutableArrayRef<DebugNamesInputChunk> &inputChunks) {
+ MapVector<uint64_t, Abbrev> abbrevMap;
+ FoldingSet<DebugNamesSection::Abbrev> AbbreviationsSet;
+
+ // Need to determine what size form is needed for the DW_IDX_compile_unit
+ // attributes in the merged index. Will need to update the abbrevs to use
+ // the right form.
+ dwarf::Form compileUnitAttrForm = getMergedCuSizeData().second;
+
+ for (DebugNamesInputChunk &chunk : inputChunks) {
+ for (const auto &ni : *chunk.debugNamesData) {
+ const auto &abbrevs = ni.getAbbrevs();
+ for (const DWARFDebugNames::Abbrev &abbrev : abbrevs) {
+ // Create canonicalized abbrev.
+ DebugNamesSection::Abbrev newAbbrev;
+ DWARFDebugNames::AttributeEncoding cuOrTuAttr(DW_IDX_compile_unit,
+ compileUnitAttrForm);
+ newAbbrev.code = abbrev.Code;
+ newAbbrev.tag = abbrev.Tag;
+ for (const auto attr : abbrev.Attributes) {
+ DWARFDebugNames::AttributeEncoding newAttr(attr.Index, attr.Form);
+ if (attr.Index == DW_IDX_compile_unit ||
+ attr.Index == DW_IDX_type_unit)
+ // Save it, to put it at the end.
+ cuOrTuAttr.Index = newAttr.Index;
+ else
+ newAbbrev.attributes.push_back(newAttr);
+ }
+ // Put the CU/TU index at the end of the attributes list.
+ newAbbrev.attributes.push_back(cuOrTuAttr);
+
+ // Next, check our abbreviations set to see if we've already seen the
+ // identical abbreviation.
+ uint32_t oldCode = newAbbrev.code;
+ uint32_t newCode;
+ FoldingSetNodeID id;
+ newAbbrev.Profile(id);
+ void *insertPos;
+ if (Abbrev *Existing =
+ AbbreviationsSet.FindNodeOrInsertPos(id, insertPos)) {
+ // Found it; we've already seen an identical abbreviation.
+ newCode = Existing->code;
+ } else {
+ // Didn't find it.
+ Abbrev *newAbbrev2 = new (Alloc) Abbrev(std::move(newAbbrev));
+ AbbreviationsSet.InsertNode(newAbbrev2, insertPos);
+ newCode = mergedAbbrevTable.size() + 1;
+ newAbbrev2->code = newCode;
+ mergedAbbrevTable.push_back(newAbbrev2);
+ }
+ chunk.abbrevCodeMap[oldCode] = newCode;
+ }
+ }
+ }
+
+ // Calculate the merged abbrev table size.
+ mergedHdr.AbbrevTableSize = 0;
+ for (Abbrev *a : mergedAbbrevTable) {
+ mergedHdr.AbbrevTableSize += getULEB128Size(a->code);
+ mergedHdr.AbbrevTableSize += getULEB128Size(a->tag);
+ for (const auto &attr : a->attributes) {
+ mergedHdr.AbbrevTableSize += getULEB128Size(attr.Index);
+ mergedHdr.AbbrevTableSize += getULEB128Size(attr.Form);
+ }
+ mergedHdr.AbbrevTableSize += 2; // attribute index & form sentinels
+ }
+ ++mergedHdr.AbbrevTableSize; // abbrev table sentinel
+}
+
+void DebugNamesSection::getMergedSymbols(
+ MutableArrayRef<DebugNamesInputChunk> &inputChunks) {
+ // The number of symbols (& abbrevs) we will handle is very large; will use
+ // multi-threading to speed it up.
+ constexpr size_t numShards = 32;
+ const size_t concurrency =
+ llvm::bit_floor(std::min<size_t>(config->threadCount, numShards));
+ const size_t shift = 32 - llvm::countr_zero(numShards);
+
+ struct ShardData {
+ // Map to uniquify symbols by name
+ MapVector<CachedHashStringRef, NamedEntry> nameMap;
+ };
+
+ // Need to determine what size is needed for the DW_IDX_compile_unit
+ // attributes in the merged index. Will need to update the indexEntries
+ // to use the right size.
+ uint8_t compileUnitAttrSize = getMergedCuSizeData().first;
+
+ auto shardsPtr = std::make_unique<ShardData[]>(numShards);
+ MutableArrayRef<ShardData> shards(shardsPtr.get(), numShards);
+
+ parallelFor(0, concurrency, [&](size_t threadId) {
+ for (size_t i = 0; i < numChunks; ++i) {
+ DebugNamesInputChunk &chunk = inputChunks[i];
+ for (auto &secData : chunk.sectionsData) {
+ // Deduplicate the NamedEntry records (based on the string/name),
+ // using a map from string/name to NamedEntry records.
+ // Note there is a twist: If there is already a record for the current
+ // 'string' in the nameMap, we append all the indexEntries from the
+ // current record to the record that's in the nameMap. I.e. we
+ // deduplicate the *strings* but we keep all the IndexEntry records
+ // (moving them to the appropriate 'kept' NamedEntry record).
+ for (auto &stringEntry : secData.namedEntries) {
+ size_t shardId = stringEntry.hashValue >> shift;
+ if ((shardId & (concurrency - 1)) != threadId)
+ continue;
+
+ auto &shard = shards[shardId];
+ stringEntry.chunkIdx = i;
+ for (auto &entry : stringEntry.indexEntries) {
+ // The DW_IDX_compile_unit is always the last attribute (we set it
+ // up that way when we read/created the attributes). We need to
+ // update the index value to use the correct merged offset, and we
+ // need to fix the size of the index attribute.
+ uint8_t endPos = entry->attrValues.size() - 1;
+ entry->attrValues[endPos].attrValue += chunk.baseCuOffsetIdx;
+ entry->attrValues[endPos].attrSize = compileUnitAttrSize;
+ // Update the entry's abbrev code to match the merged
+ // abbreviations.
+ entry->abbrevCode = chunk.abbrevCodeMap[entry->abbrevCode];
+ }
+
+ CachedHashStringRef cachedHashName(stringEntry.name);
+ auto [it, inserted] =
+ shard.nameMap.try_emplace(cachedHashName, std::move(stringEntry));
+ if (!inserted) {
+ // Found the string already; don't add to map, but append
+ // entry/entries for it to existing map entry.
+ NamedEntry &found = it->second;
+ // Append the entries...
+ for (auto &entry : stringEntry.indexEntries)
+ found.indexEntries.push_back(std::move(entry));
+ }
+ }
+ }
+ }
+ });
+
+ // Combined the shared symbols into mergedEntries
+ for (auto &shard : shards)
+ for (auto &mapEntry : shard.nameMap)
+ mergedEntries.push_back(std::move(mapEntry.second));
+ mergedHdr.NameCount = mergedEntries.size();
+}
+
+void DebugNamesSection::computeUniqueHashes(
+ MutableArrayRef<DebugNamesInputChunk> &chunks) {
+ SmallVector<uint32_t, 0> uniques;
+ for (const auto &chunk : chunks)
+ uniques.append(chunk.hashValues);
+ mergedHdr.BucketCount = dwarf::getDebugNamesBucketAndHashCount(uniques).first;
+}
+
+void DebugNamesSection::generateBuckets() {
+ bucketList.resize(mergedHdr.BucketCount);
+ for (auto &entry : mergedEntries) {
+ uint32_t bucketIdx = entry.hashValue % mergedHdr.BucketCount;
+ bucketList[bucketIdx].push_back(&entry);
+ }
+
+ // Sort the contents of the buckets by hash value so that the hash collisions
+ // end up together.
+ for (auto &bucket : bucketList)
+ llvm::stable_sort(bucket, [](NamedEntry *lhs, NamedEntry *rhs) {
+ return lhs->hashValue < rhs->hashValue;
+ });
+}
+
+void DebugNamesSection::calculateEntriesSizeAndOffsets() {
+ uint32_t offset = 0;
+ for (DebugNamesSection::NamedEntry &stringEntry : mergedEntries) {
+ stringEntry.entryOffset = offset;
+ for (auto &entry : stringEntry.indexEntries) {
+ uint32_t entrySize = 0;
+ entry->poolOffset = offset;
+ uint32_t ulebSize = getULEB128Size(entry->abbrevCode);
+ entrySize += ulebSize;
+ for (const auto &attr : entry->attrValues)
+ entrySize += attr.attrSize;
+ offset += entrySize;
+ }
+ // Add in sentinel size
+ ++offset;
+ }
+ mergedTotalEntriesSize = offset;
+}
+
+void DebugNamesSection::updateParentIndexEntries() {
+ for (DebugNamesSection::NamedEntry &stringEntry : mergedEntries) {
+ for (auto &childEntry : stringEntry.indexEntries) {
+ if (!childEntry->parentEntry)
+ continue;
+
+ // Abbrevs are indexed starting at 1; vector starts at 0. (abbrevCode
+ // corresponds to position in the merged table vector).
+ const Abbrev *abbrev = mergedAbbrevTable[childEntry->abbrevCode - 1];
+
+ // Found the abbrev. Find the index for the DW_IDX_parent attribute
+ // (in the abbrev) and update that value in the entry with the
+ // correct parent offset (in the merged entry pool).
+ for (size_t idx = 0, size = abbrev->attributes.size(); idx < size;
+ ++idx) {
+ auto attr = abbrev->attributes[idx];
+ if (attr.Index == DW_IDX_parent && attr.Form == DW_FORM_ref4)
+ childEntry->attrValues[idx].attrValue =
+ childEntry->parentEntry->poolOffset;
+ }
+ }
+ }
+}
+
+uint64_t DebugNamesSection::calculateMergedSectionSize() {
+ uint32_t hdrSize = computeDebugNamesHeaderSize();
+ findDebugNamesOffsets(mergedOffsets, hdrSize, mergedHdr.Format, mergedHdr);
+ // Add in the size for all the Entries, and make it 4-byte aligned.
+ mergedHdr.UnitLength =
+ alignTo(mergedOffsets.EntriesBase + mergedTotalEntriesSize, 4);
+ // Add in the first 4 bytes, whichs print out the length of the section.
+ return mergedHdr.UnitLength + 4;
+}
+
+template <class ELFT> DebugNamesSection *DebugNamesSection::create() {
+ llvm::TimeTraceScope timeScope("Create merged .debug_names");
+ SetVector<InputFile *> files;
+ SmallVector<InputSectionBase *, 0> sections;
+ for (InputSectionBase *s : ctx.inputSections) {
+ InputSection *isec = dyn_cast<InputSection>(s);
+ if (!isec)
+ continue;
+ // Mark original sections as dead, but save links to them for calculating
+ // relocations later.
+ if (s->name == ".debug_names") {
+ s->markDead();
+ sections.push_back(s);
+ files.insert(isec->file);
+ }
+ }
+ auto inputChunksPtr = std::make_unique<DebugNamesInputChunk[]>(files.size());
+ MutableArrayRef<DebugNamesInputChunk> inputChunks(inputChunksPtr.get(),
+ files.size());
+ auto outputChunks = std::make_unique<DebugNamesOutputChunk[]>(files.size());
+ parallelFor(0, files.size(), [&](size_t i) {
+ ObjFile<ELFT> *file = cast<ObjFile<ELFT>>(files[i]);
+ auto dwarfCtx = std::make_unique<DWARFContext>(
+ std::make_unique<LLDDwarfObj<ELFT>>(file));
+ auto &dobj =
+ static_cast<const LLDDwarfObj<ELFT> &>(dwarfCtx->getDWARFObj());
+
+ // Extract llvm::DWARFDebugNames data from the .debug_names section. The
+ // .debug_names section needs the .debug_str section, to get the actual
+ // symbol names.
+ const StringRef &strSection = dobj.getStrSection();
+ const LLDDWARFSection &namesSection = dobj.getNamesSection();
+ llvm::DWARFDataExtractor namesExtractor(dobj, namesSection, config->isLE,
+ config->wordsize);
+ llvm::DataExtractor strExtractor(strSection, config->isLE,
+ config->wordsize);
+ inputChunks[i].debugNamesData =
+ std::make_unique<DWARFDebugNames>(namesExtractor, strExtractor);
+ inputChunks[i].namesSection =
+ std::make_unique<LLDDWARFSection>(namesSection);
+ if (llvm::Error E = inputChunks[i].debugNamesData->extract()) {
+ // Report an error here. We were unable to extract the data.
+ errorOrWarn(toString(dobj.getNamesSection().sec) + ": " +
+ toString(std::move(E)));
+ }
+ outputChunks[i].sec = dobj.getInfoSection();
+ collectDebugNamesSectionData<ELFT>(inputChunks[i], outputChunks[i],
+ namesExtractor, strExtractor);
+ });
+
+ auto *ret = make<DebugNamesSection>();
+ ret->addSections(sections);
+ ret->outputChunks = std::move(outputChunks);
+ ret->numChunks = files.size();
+ ret->collectMergedCounts(inputChunks);
+ ret->getMergedAbbrevTable(inputChunks);
+ ret->getMergedSymbols(inputChunks);
+ ret->computeUniqueHashes(inputChunks);
+ inputChunksPtr.reset();
+ ret->generateBuckets();
+ ret->calculateEntriesSizeAndOffsets();
+ ret->updateParentIndexEntries();
+ ret->sectionSize = ret->calculateMergedSectionSize();
+ return ret;
+}
+
GdbIndexSection::GdbIndexSection()
: SyntheticSection(0, SHT_PROGBITS, 1, ".gdb_index") {}
@@ -3965,6 +4721,11 @@ InStruct elf::in;
std::vector<Partition> elf::partitions;
Partition *elf::mainPart;
+template DebugNamesSection *DebugNamesSection::create<ELF32LE>();
+template DebugNamesSection *DebugNamesSection::create<ELF32BE>();
+template DebugNamesSection *DebugNamesSection::create<ELF64LE>();
+template DebugNamesSection *DebugNamesSection::create<ELF64BE>();
+
template GdbIndexSection *GdbIndexSection::create<ELF32LE>();
template GdbIndexSection *GdbIndexSection::create<ELF32BE>();
template GdbIndexSection *GdbIndexSection::create<ELF64LE>();
diff --git a/lld/ELF/SyntheticSections.h b/lld/ELF/SyntheticSections.h
index fa21b80a5a5ea0..df13e6c0baca2a 100644
--- a/lld/ELF/SyntheticSections.h
+++ b/lld/ELF/SyntheticSections.h
@@ -21,12 +21,16 @@
#define LLD_ELF_SYNTHETIC_SECTIONS_H
#include "Config.h"
+#include "DWARF.h"
#include "InputSection.h"
#include "Symbols.h"
#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
#include "llvm/MC/StringTableBuilder.h"
+#include "llvm/Support/Allocator.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Parallel.h"
@@ -788,6 +792,136 @@ class RelroPaddingSection final : public SyntheticSection {
void writeTo(uint8_t *buf) override {}
};
+class DebugNamesSection final : public SyntheticSection {
+ // N.B. Everything in this class assumes that we are using DWARF32.
+ // If we move to DWARF64, most of this data will need to be re-sized,
+ // and the code that handles or manipulates it will need to be updated
+ // accordingly.
+
+public:
+ DebugNamesSection();
+ template <typename ELFT> static DebugNamesSection *create();
+ void writeTo(uint8_t *buf) override;
+ size_t getSize() const override { return sectionSize; }
+ bool isNeeded() const override;
+
+ void addSections(SmallVector<InputSectionBase *, 0> sec_list) {
+ inputDebugNamesSections = sec_list;
+ }
+
+ template <class ELFT> void writeToImpl(uint8_t *buf);
+
+ template <class ELFT, class RelTy>
+ void getNameRelocsImpl(InputSection *sec, ArrayRef<RelTy> rels,
+ llvm::DenseMap<uint32_t, uint32_t> &relocs);
+
+ template <class ELFT>
+ void getNameRelocs(InputSectionBase *base,
+ llvm::DenseMap<uint32_t, uint32_t> &relocs);
+
+ template <class ELFT>
+ void endianWrite(uint8_t size, uint8_t *buf_start, uint32_t offset,
+ uint32_t data);
+
+ struct Abbrev : public llvm::FoldingSetNode {
+ uint32_t code;
+ uint32_t tag;
+ SmallVector<llvm::DWARFDebugNames::AttributeEncoding, 2> attributes;
+
+ void Profile(llvm::FoldingSetNodeID &id) const;
+ };
+
+ struct AttrValueData {
+ uint32_t attrValue;
+ uint8_t attrSize;
+ };
+
+ struct IndexEntry {
+ uint32_t abbrevCode;
+ uint32_t poolOffset;
+ union {
+ int32_t parentOffset = -1;
+ IndexEntry *parentEntry;
+ };
+ SmallVector<AttrValueData, 3> attrValues;
+ };
+
+ struct NamedEntry {
+ const char *name;
+ uint32_t hashValue;
+ uint32_t stringOffsetOffset;
+ uint32_t entryOffset;
+ uint32_t relocatedEntryOffset;
+ // The index of the chunk that 'name' points into, for looking up
+ // relocation data for this string.
+ uint32_t chunkIdx;
+ SmallVector<std::unique_ptr<IndexEntry>, 0> indexEntries;
+ };
+
+ struct SectionOffsetLocs {
+ uint64_t stringOffsetsBase;
+ uint64_t entryOffsetsBase;
+ uint64_t entriesBase;
+ };
+
+ struct DebugNamesSectionData {
+ llvm::DWARFDebugNames::Header hdr;
+ llvm::DWARFDebugNames::DWARFDebugNamesOffsets locs;
+ SmallVector<uint32_t, 0> tuOffsets;
+ SmallVector<Abbrev, 0> abbrevTable;
+ std::unique_ptr<uint32_t[]> entryOffsets;
+ SmallVector<NamedEntry, 0> namedEntries;
+ uint16_t dwarfSize;
+ uint16_t hdrSize;
+ };
+
+ // Per-file data used, while reading in the data, to generate the merged
+ // section information.
+ struct DebugNamesInputChunk {
+ uint32_t baseCuOffsetIdx;
+ std::unique_ptr<llvm::DWARFDebugNames> debugNamesData;
+ std::unique_ptr<LLDDWARFSection> namesSection;
+ SmallVector<DebugNamesSectionData, 0> sectionsData;
+ SmallVector<uint32_t, 0> hashValues;
+ llvm::DenseMap<uint32_t, uint32_t> abbrevCodeMap;
+ };
+
+ // Per-file data needed for correctly writing out the .debug_names section.
+ struct DebugNamesOutputChunk {
+ // Pointer to .debug_info section for this chunk/file, used for
+ // calculating correct relocated CU offsets in the merged index.
+ InputSection *sec;
+ SmallVector<uint32_t, 0> compilationUnits;
+ SmallVector<uint32_t, 0> typeUnits;
+ };
+
+ void collectMergedCounts(MutableArrayRef<DebugNamesInputChunk> &inputChunks);
+ std::pair<uint8_t, llvm::dwarf::Form> getMergedCuSizeData();
+ void getMergedAbbrevTable(MutableArrayRef<DebugNamesInputChunk> &inputChunks);
+ void getMergedSymbols(MutableArrayRef<DebugNamesInputChunk> &inputChunks);
+ void computeUniqueHashes(MutableArrayRef<DebugNamesInputChunk> &inputChunks);
+ void generateBuckets();
+ void calculateEntriesSizeAndOffsets();
+ void updateParentIndexEntries();
+ uint64_t calculateMergedSectionSize();
+
+ llvm::BumpPtrAllocator Alloc;
+
+private:
+ size_t sectionSize;
+ uint32_t mergedTotalEntriesSize;
+ uint32_t numChunks;
+ llvm::DWARFDebugNames::DWARFDebugNamesOffsets mergedOffsets;
+ std::unique_ptr<DebugNamesOutputChunk[]> outputChunks;
+ // Pointers to the original .debug_names sections; used for find the correct'
+ // string relocation values when writing out the merged index.
+ SmallVector<InputSectionBase *, 0> inputDebugNamesSections;
+ llvm::DWARFDebugNames::Header mergedHdr;
+ SmallVector<Abbrev *, 0> mergedAbbrevTable;
+ SmallVector<NamedEntry, 0> mergedEntries;
+ SmallVector<SmallVector<NamedEntry *, 0>, 0> bucketList;
+};
+
class GdbIndexSection final : public SyntheticSection {
public:
struct AddressEntry {
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index 40d617b7fdf324..95267523ef5966 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -543,6 +543,9 @@ template <class ELFT> void elf::createSyntheticSections() {
if (config->gdbIndex)
add(*GdbIndexSection::create<ELFT>());
+ if (config->debugNames)
+ add(*DebugNamesSection::create<ELFT>());
+
// We always need to add rel[a].plt to output if it has entries.
// Even for static linking it can contain R_[*]_IRELATIVE relocations.
in.relaPlt = std::make_unique<RelocationSection<ELFT>>(
diff --git a/lld/docs/ld.lld.1 b/lld/docs/ld.lld.1
index 65e50e349c8cc0..ba091a9844fe10 100644
--- a/lld/docs/ld.lld.1
+++ b/lld/docs/ld.lld.1
@@ -172,6 +172,10 @@ This is like a generalized
Output cross reference table. If
.Fl Map
is specified, print to the map file.
+.It Fl -debug-names
+Generate a merged
+.Li .debug_names
+section.
.It Fl -defsym Ns = Ns Ar symbol Ns = Ns Ar expression
Define a symbol alias.
.Ar expression
diff --git a/lld/test/ELF/Inputs/debug-names-2.s b/lld/test/ELF/Inputs/debug-names-2.s
new file mode 100644
index 00000000000000..586788653dcc72
--- /dev/null
+++ b/lld/test/ELF/Inputs/debug-names-2.s
@@ -0,0 +1,191 @@
+#-- input file: debug-names-2.cpp
+## Generated with:
+##
+## - clang++ -g -O0 -gpubnames -fdebug-compilation-dir='debug-names-test' \
+## -S debug-names-2.cpp -o debug-names-2.s
+##
+## debug-names-2.cpp contents:
+##
+## struct t1 { };
+## int main() {
+## t1 v1;
+## }
+##
+ .text
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+.Ltmp0:
+ xorl %eax, %eax
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x3d DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0x1b DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 3 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ .long 62 # DW_AT_type
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x32:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 127
+ .byte 5 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 3 # DW_AT_decl_line
+ .long 66 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x3e:0x4 DW_TAG_base_type
+ .byte 4 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 5 # Abbrev [5] 0x42:0x6 DW_TAG_structure_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 6 # DW_AT_name
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 32 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)" # string offset=0
+.Linfo_string1:
+ .asciz "debug-names-2.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=122
+.Linfo_string3:
+ .asciz "main" # string offset=139
+.Linfo_string4:
+ .asciz "int" # string offset=144
+.Linfo_string5:
+ .asciz "v1" # string offset=148
+.Linfo_string6:
+ .asciz "t1" # string offset=151
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 3 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 3 # Bucket 2
+ .long 5863786 # Hash in Bucket 1
+ .long 2090499946 # Hash in Bucket 1
+ .long 193495088 # Hash in Bucket 2
+ .long .Linfo_string6 # String in Bucket 1: t1
+ .long .Linfo_string3 # String in Bucket 1: main
+ .long .Linfo_string4 # String in Bucket 2: int
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 3 # Abbrev code
+ .byte 36 # DW_TAG_base_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames2:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 66 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: t1
+.Lnames0:
+.L2:
+ .byte 2 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: main
+.Lnames1:
+.L0:
+ .byte 3 # Abbreviation code
+ .long 62 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/Inputs/debug-names-parent-idx-2.s b/lld/test/ELF/Inputs/debug-names-parent-idx-2.s
new file mode 100644
index 00000000000000..7eedaaee549450
--- /dev/null
+++ b/lld/test/ELF/Inputs/debug-names-parent-idx-2.s
@@ -0,0 +1,347 @@
+#-- input file: debug-names-parent-idx-2.cpp
+## Generated with:
+##
+## - clang++ -g -O0 -gpubnames -fdebug-compilation-dir='parent-idx-test' \
+## -S debug-names-parent-idx-2.cpp -o debug-names-parent-idx-2.s
+##
+## foo.h contents:
+##
+## int foo();
+##
+## struct foo {
+## int x;
+## char y;
+## struct foo *foo_ptr;
+## };
+##
+## namespace parent_test {
+## int foo();
+## }
+##
+## debug-names-parent-index-2.cpp contents:
+##
+## #include "foo.h"
+## int foo () {
+## struct foo struct2;
+## struct2.x = 1024;
+## struct2.y = 'r';
+## struct2.foo_ptr = nullptr;
+## return struct2.x * (int) struct2.y;
+## }
+##
+## namespace parent_test {
+## int foo () {
+## return 25;
+## }
+## }
+##
+ .text
+ .globl _Z3foov # -- Begin function _Z3foov
+ .p2align 4, 0x90
+ .type _Z3foov, at function
+_Z3foov: # @_Z3foov
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+.Ltmp0:
+ movl $1024, -16(%rbp) # imm = 0x400
+ movb $114, -12(%rbp)
+ movq $0, -8(%rbp)
+ movl -16(%rbp), %eax
+ movsbl -12(%rbp), %ecx
+ imull %ecx, %eax
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size _Z3foov, .Lfunc_end0-_Z3foov
+ .cfi_endproc
+ # -- End function
+ .globl _ZN11parent_test3fooEv # -- Begin function _ZN11parent_test3fooEv
+ .p2align 4, 0x90
+ .type _ZN11parent_test3fooEv, at function
+_ZN11parent_test3fooEv: # @_ZN11parent_test3fooEv
+.Lfunc_begin1:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+.Ltmp2:
+ movl $25, %eax
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp3:
+.Lfunc_end1:
+ .size _ZN11parent_test3fooEv, .Lfunc_end1-_ZN11parent_test3fooEv
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x76 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end1-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0x4 DW_TAG_base_type
+ .byte 3 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 3 # Abbrev [3] 0x27:0x1c DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 5 # DW_AT_linkage_name
+ .byte 6 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .long 35 # DW_AT_type
+ # DW_AT_external
+ .byte 4 # Abbrev [4] 0x37:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 112
+ .byte 8 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .long 86 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 5 # Abbrev [5] 0x43:0x13 DW_TAG_namespace
+ .byte 4 # DW_AT_name
+ .byte 6 # Abbrev [6] 0x45:0x10 DW_TAG_subprogram
+ .byte 1 # DW_AT_low_pc
+ .long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 7 # DW_AT_linkage_name
+ .byte 6 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 16 # DW_AT_decl_line
+ .long 35 # DW_AT_type
+ # DW_AT_external
+ .byte 0 # End Of Children Mark
+ .byte 7 # Abbrev [7] 0x56:0x22 DW_TAG_structure_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 6 # DW_AT_name
+ .byte 16 # DW_AT_byte_size
+ .byte 1 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .byte 8 # Abbrev [8] 0x5c:0x9 DW_TAG_member
+ .byte 9 # DW_AT_name
+ .long 35 # DW_AT_type
+ .byte 1 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .byte 0 # DW_AT_data_member_location
+ .byte 8 # Abbrev [8] 0x65:0x9 DW_TAG_member
+ .byte 10 # DW_AT_name
+ .long 120 # DW_AT_type
+ .byte 1 # DW_AT_decl_file
+ .byte 6 # DW_AT_decl_line
+ .byte 4 # DW_AT_data_member_location
+ .byte 8 # Abbrev [8] 0x6e:0x9 DW_TAG_member
+ .byte 12 # DW_AT_name
+ .long 124 # DW_AT_type
+ .byte 1 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .byte 8 # DW_AT_data_member_location
+ .byte 0 # End Of Children Mark
+ .byte 2 # Abbrev [2] 0x78:0x4 DW_TAG_base_type
+ .byte 11 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 9 # Abbrev [9] 0x7c:0x5 DW_TAG_pointer_type
+ .long 86 # DW_AT_type
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 56 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)" # string offset=0
+.Linfo_string1:
+ .asciz "debug-names-parent-idx-2.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "parent-idx-test" # string offset=133
+.Linfo_string3:
+ .asciz "int" # string offset=149
+.Linfo_string4:
+ .asciz "foo" # string offset=153
+.Linfo_string5:
+ .asciz "_Z3foov" # string offset=157
+.Linfo_string6:
+ .asciz "parent_test" # string offset=165
+.Linfo_string7:
+ .asciz "_ZN11parent_test3fooEv" # string offset=177
+.Linfo_string8:
+ .asciz "struct2" # string offset=200
+.Linfo_string9:
+ .asciz "x" # string offset=208
+.Linfo_string10:
+ .asciz "y" # string offset=210
+.Linfo_string11:
+ .asciz "char" # string offset=212
+.Linfo_string12:
+ .asciz "foo_ptr" # string offset=217
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+ .quad .Lfunc_begin1
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 6 # Header: bucket count
+ .long 6 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 3 # Bucket 2
+ .long 5 # Bucket 3
+ .long 0 # Bucket 4
+ .long 6 # Bucket 5
+ .long -1451972055 # Hash in Bucket 1
+ .long -1257882357 # Hash in Bucket 1
+ .long 175265198 # Hash in Bucket 2
+ .long 193495088 # Hash in Bucket 2
+ .long 193491849 # Hash in Bucket 3
+ .long 2090147939 # Hash in Bucket 5
+ .long .Linfo_string7 # String in Bucket 1: _ZN11parent_test3fooEv
+ .long .Linfo_string5 # String in Bucket 1: _Z3foov
+ .long .Linfo_string6 # String in Bucket 2: parent_test
+ .long .Linfo_string3 # String in Bucket 2: int
+ .long .Linfo_string4 # String in Bucket 3: foo
+ .long .Linfo_string11 # String in Bucket 5: char
+ .long .Lnames4-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames3-.Lnames_entries0 # Offset in Bucket 2
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 2
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 3
+ .long .Lnames5-.Lnames_entries0 # Offset in Bucket 5
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 3 # Abbrev code
+ .byte 57 # DW_TAG_namespace
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 4 # Abbrev code
+ .byte 36 # DW_TAG_base_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 5 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames4:
+.L3:
+ .byte 1 # Abbreviation code
+ .long 69 # DW_IDX_die_offset
+ .long .L5-.Lnames_entries0 # DW_IDX_parent
+ .byte 0 # End of list: _ZN11parent_test3fooEv
+.Lnames2:
+.L0:
+ .byte 2 # Abbreviation code
+ .long 39 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _Z3foov
+.Lnames3:
+.L5:
+ .byte 3 # Abbreviation code
+ .long 67 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: parent_test
+.Lnames0:
+.L2:
+ .byte 4 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+.Lnames1:
+ .byte 2 # Abbreviation code
+ .long 39 # DW_IDX_die_offset
+ .byte 1 # DW_IDX_parent
+ # Abbreviation code
+ .long 69 # DW_IDX_die_offset
+ .long .L5-.Lnames_entries0 # DW_IDX_parent
+.L4:
+ .byte 5 # Abbreviation code
+ .long 86 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: foo
+.Lnames5:
+.L1:
+ .byte 4 # Abbreviation code
+ .long 120 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: char
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names-bad-aug-string.s b/lld/test/ELF/debug-names-bad-aug-string.s
new file mode 100644
index 00000000000000..edf79f0fde5773
--- /dev/null
+++ b/lld/test/ELF/debug-names-bad-aug-string.s
@@ -0,0 +1,189 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %p/Inputs/debug-names-2.s -o %t2
+# RUN: ld.lld --debug-names %t1.o %t2.o -o %t
+
+# RUN: llvm-dwarfdump -debug-names %t | FileCheck %s --check-prefix=DWARF
+
+# DWARF: .debug_names contents:
+# DWARF: Name Index @ 0x0 {
+# DWARF-NEXT: Header {
+# DWARF-NEXT: Length: 0xCC
+# DWARF-NEXT: Format: DWARF32
+# DWARF-NEXT: Version: 5
+# DWARF-NEXT: CU count: 2
+# DWARF-NEXT: Local TU count: 0
+# DWARF-NEXT: Foreign TU count: 0
+# DWARF-NEXT: Bucket count: 5
+# DWARF-NEXT: Name count: 5
+# DWARF-NEXT: Abbreviations table size: 0x1F
+# DWARF-NEXT: Augmentation: ' '
+# DWARF: Compilation Unit offsets [
+# DWARF-NEXT: CU[0]: 0x00000000
+# DWARF-NEXT: CU[1]: 0x00000041
+
+##
+## This file was generated by copying debug-names.s and manually
+## editing the 'Header: augmentation string' in the .debug_names section.
+##
+ .text
+ .globl _Z2f12t1 # -- Begin function _Z2f12t1
+ .p2align 4, 0x90
+ .type _Z2f12t1, at function
+_Z2f12t1: # @_Z2f12t1
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+.Ltmp0:
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size _Z2f12t1, .Lfunc_end0-_Z2f12t1
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x35 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0x17 DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 3 # DW_AT_linkage_name
+ .byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x2f:0xa DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 127
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ .long 58 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x3a:0x6 DW_TAG_structure_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 5 # DW_AT_name
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 28 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)" # string offset=0
+.Linfo_string1:
+ .asciz "debug-names.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=120
+.Linfo_string3:
+ .asciz "f1" # string offset=137
+.Linfo_string4:
+ .asciz "_Z2f12t1" # string offset=140
+.Linfo_string5:
+ .asciz "t1" # string offset=149
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 3 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "JUNK1234" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 3 # Bucket 2
+ .long 5863324 # Hash in Bucket 1
+ .long 5863786 # Hash in Bucket 1
+ .long 1398125246 # Hash in Bucket 2
+ .long .Linfo_string3 # String in Bucket 1: f1
+ .long .Linfo_string5 # String in Bucket 1: t1
+ .long .Linfo_string4 # String in Bucket 2: _Z2f12t1
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: f1
+.Lnames2:
+.L0:
+ .byte 2 # Abbreviation code
+ .long 58 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: t1
+.Lnames1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _Z2f12t1
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names-bad-die-idx-sizes.s b/lld/test/ELF/debug-names-bad-die-idx-sizes.s
new file mode 100644
index 00000000000000..2da278a8dd5b7c
--- /dev/null
+++ b/lld/test/ELF/debug-names-bad-die-idx-sizes.s
@@ -0,0 +1,151 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+#
+# RUN: not ld.lld --debug-names %t1.o -o /dev/null 2>&1 | FileCheck %s
+#
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+
+## This file was generated by first compiling main.cpp:
+## clang++ -g -O0 -S -gpubnames -fdebug-compilation-dir='debug-names-test' \
+## main.cpp
+##
+## Then manually edit the .debug_names section. In the entries, change the
+## size of the DW_IDX_die_offset from '.long' to '.byte'.
+##
+## main.cpp:
+## int main (int argc, char **argv) { }
+##
+ .text
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ movl %edi, -4(%rbp)
+ movq %rsi, -16(%rbp)
+.Ltmp0:
+ xorl %eax, %eax
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 36 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git d33d5630b281debe6eabd67e323bcf767340fb6a)" # string offset=0
+.Linfo_string1:
+ .asciz "main.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=113
+.Linfo_string3:
+ .asciz "main" # string offset=130
+.Linfo_string4:
+ .asciz "int" # string offset=135
+.Linfo_string5:
+ .asciz "argc" # string offset=139
+.Linfo_string6:
+ .asciz "argv" # string offset=144
+.Linfo_string7:
+ .asciz "char" # string offset=149
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 3 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 2 # Bucket 2
+ .long 2090499946 # Hash in Bucket 1
+ .long 193495088 # Hash in Bucket 2
+ .long 2090147939 # Hash in Bucket 2
+ .long .Linfo_string3 # String in Bucket 1: main
+ .long .Linfo_string4 # String in Bucket 2: int
+ .long .Linfo_string7 # String in Bucket 2: char
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 36 # DW_TAG_base_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L1:
+ .byte 1 # Abbreviation code
+ .byte 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: main
+.Lnames1:
+.L0:
+ .byte 2 # Abbreviation code
+ .byte 73 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+.Lnames2:
+.L2:
+ .byte 2 # Abbreviation code
+ .byte 87 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: char
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git d33d5630b281debe6eabd67e323bcf767340fb6a)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names-bad-name-count.s b/lld/test/ELF/debug-names-bad-name-count.s
new file mode 100644
index 00000000000000..4acfa182b11a91
--- /dev/null
+++ b/lld/test/ELF/debug-names-bad-name-count.s
@@ -0,0 +1,154 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+#
+# RUN: not ld.lld --debug-names %t1.o -o /dev/null 2>&1 | FileCheck %s
+#
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+
+## This file was generated by first compiling main.cpp:
+## clang++ -g -O0 -S -gpubnames -fdebug-compilation-dir='debug-names-test' \
+## main.cpp
+##
+## Then manually edit .debug_names section: change value for
+## 'Header: name count' from 3 to 4.
+##
+## main.cpp:
+## int main (int argc, char **argv) { }
+##
+ .text
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ movl %edi, -4(%rbp)
+ movq %rsi, -16(%rbp)
+.Ltmp0:
+ xorl %eax, %eax
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 36 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git d33d5630b281debe6eabd67e323bcf767340fb6a)" # string offset=0
+.Linfo_string1:
+ .asciz "main.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=113
+.Linfo_string3:
+ .asciz "main" # string offset=130
+.Linfo_string4:
+ .asciz "int" # string offset=135
+.Linfo_string5:
+ .asciz "argc" # string offset=139
+.Linfo_string6:
+ .asciz "argv" # string offset=144
+.Linfo_string7:
+ .asciz "char" # string offset=149
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 4 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 2 # Bucket 2
+ .long 2090499946 # Hash in Bucket 1
+ .long 193495088 # Hash in Bucket 2
+ .long 2090147939 # Hash in Bucket 2
+ .long .Linfo_string3 # String in Bucket 1: main
+ .long .Linfo_string4 # String in Bucket 2: int
+ .long .Linfo_string7 # String in Bucket 2: char
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 36 # DW_TAG_base_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: main
+.Lnames1:
+.L0:
+ .byte 2 # Abbreviation code
+ .long 73 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+.Lnames2:
+.L2:
+ .byte 2 # Abbreviation code
+ .long 87 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: char
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git d33d5630b281debe6eabd67e323bcf767340fb6a)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names-bad-offsets-sizes.s b/lld/test/ELF/debug-names-bad-offsets-sizes.s
new file mode 100644
index 00000000000000..e11d19a9bf579c
--- /dev/null
+++ b/lld/test/ELF/debug-names-bad-offsets-sizes.s
@@ -0,0 +1,153 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+#
+# RUN: not ld.lld --debug-names %t1.o -o /dev/null 2>&1 | FileCheck %s
+#
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+# CHECK: error: {{.*}}:(.debug_names): encountered unexpected end of section while reading entry
+
+## This file was generated by first compiling main.cpp:
+## clang++ -g -O0 -S -gpubnames -fdebug-compilation-dir='debug-names-test' \
+## main.cpp
+##
+## Then manually edit .debug_names section. Change the sizes of
+## 'Offset in Bucket' values from '.long' to '.byte'.
+##
+## main.cpp:
+## int main (int argc, char **argv) { }
+##
+ .text
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ movl %edi, -4(%rbp)
+ movq %rsi, -16(%rbp)
+.Ltmp0:
+ xorl %eax, %eax
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 36 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git d33d5630b281debe6eabd67e323bcf767340fb6a)" # string offset=0
+.Linfo_string1:
+ .asciz "main.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=113
+.Linfo_string3:
+ .asciz "main" # string offset=130
+.Linfo_string4:
+ .asciz "int" # string offset=135
+.Linfo_string5:
+ .asciz "argc" # string offset=139
+.Linfo_string6:
+ .asciz "argv" # string offset=144
+.Linfo_string7:
+ .asciz "char" # string offset=149
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 3 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 2 # Bucket 2
+ .long 2090499946 # Hash in Bucket 1
+ .long 193495088 # Hash in Bucket 2
+ .long 2090147939 # Hash in Bucket 2
+ .long .Linfo_string3 # String in Bucket 1: main
+ .long .Linfo_string4 # String in Bucket 2: int
+ .long .Linfo_string7 # String in Bucket 2: char
+ .byte .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .byte .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+ .byte .Lnames2-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 36 # DW_TAG_base_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: main
+.Lnames1:
+.L0:
+ .byte 2 # Abbreviation code
+ .long 73 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+.Lnames2:
+.L2:
+ .byte 2 # Abbreviation code
+ .long 87 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: char
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git d33d5630b281debe6eabd67e323bcf767340fb6a)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names-bad-version.s b/lld/test/ELF/debug-names-bad-version.s
new file mode 100644
index 00000000000000..f3914670af94a5
--- /dev/null
+++ b/lld/test/ELF/debug-names-bad-version.s
@@ -0,0 +1,173 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %p/Inputs/debug-names-2.s -o %t2
+#
+# RUN: not ld.lld --debug-names %t1.o %t2.o -o /dev/null 2>&1 | FileCheck %s
+#
+# CHECK: error: {{.*}}:(.debug_names): unsupported version
+##
+## This file was generated by copying debug-names.s and manually
+## editing the 'Header: version' in the .debug_names section (changed it from
+## 5 to 4).
+
+ .text
+ .globl _Z2f12t1 # -- Begin function _Z2f12t1
+ .p2align 4, 0x90
+ .type _Z2f12t1, at function
+_Z2f12t1: # @_Z2f12t1
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+.Ltmp0:
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size _Z2f12t1, .Lfunc_end0-_Z2f12t1
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x35 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0x17 DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 3 # DW_AT_linkage_name
+ .byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x2f:0xa DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 127
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ .long 58 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x3a:0x6 DW_TAG_structure_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 5 # DW_AT_name
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 28 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)" # string offset=0
+.Linfo_string1:
+ .asciz "debug-names.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=120
+.Linfo_string3:
+ .asciz "f1" # string offset=137
+.Linfo_string4:
+ .asciz "_Z2f12t1" # string offset=140
+.Linfo_string5:
+ .asciz "t1" # string offset=149
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 4 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 3 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 3 # Bucket 2
+ .long 5863324 # Hash in Bucket 1
+ .long 5863786 # Hash in Bucket 1
+ .long 1398125246 # Hash in Bucket 2
+ .long .Linfo_string3 # String in Bucket 1: f1
+ .long .Linfo_string5 # String in Bucket 1: t1
+ .long .Linfo_string4 # String in Bucket 2: _Z2f12t1
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: f1
+.Lnames2:
+.L0:
+ .byte 2 # Abbreviation code
+ .long 58 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: t1
+.Lnames1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _Z2f12t1
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names-invalid-attribute.s b/lld/test/ELF/debug-names-invalid-attribute.s
new file mode 100644
index 00000000000000..9b1a915d81f882
--- /dev/null
+++ b/lld/test/ELF/debug-names-invalid-attribute.s
@@ -0,0 +1,179 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+#
+# RUN: not ld.lld --debug-names %t1.o -o /dev/null 2>&1 | FileCheck %s
+#
+# CHECK: error: {{.*}}:(.debug_names): unrecognized form encoding 16 in .debug_names abbrev table
+##
+## Generated by copying debug-names.s and manually editing it to make some
+## of the abbrev attributes invalid.
+
+ .text
+ .globl _Z2f12t1 # -- Begin function _Z2f12t1
+ .p2align 4, 0x90
+ .type _Z2f12t1, at function
+_Z2f12t1: # @_Z2f12t1
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+.Ltmp0:
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size _Z2f12t1, .Lfunc_end0-_Z2f12t1
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x35 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0x17 DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 3 # DW_AT_linkage_name
+ .byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x2f:0xa DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 127
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ .long 58 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x3a:0x6 DW_TAG_structure_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 5 # DW_AT_name
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 28 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)" # string offset=0
+.Linfo_string1:
+ .asciz "debug-names.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=120
+.Linfo_string3:
+ .asciz "f1" # string offset=137
+.Linfo_string4:
+ .asciz "_Z2f12t1" # string offset=140
+.Linfo_string5:
+ .asciz "t1" # string offset=149
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 3 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 3 # Bucket 2
+ .long 5863324 # Hash in Bucket 1
+ .long 5863786 # Hash in Bucket 1
+ .long 1398125246 # Hash in Bucket 2
+ .long .Linfo_string3 # String in Bucket 1: f1
+ .long .Linfo_string5 # String in Bucket 1: t1
+ .long .Linfo_string4 # String in Bucket 2: _Z2f12t1
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 3 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 16 # DW_FORM_ref_addr
+ .byte 7 # DW_IDX_unknown
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: f1
+.Lnames2:
+.L0:
+ .byte 2 # Abbreviation code
+ .long 58 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: t1
+.Lnames1:
+ .byte 3 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _Z2f12t1
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names-parent-idx.s b/lld/test/ELF/debug-names-parent-idx.s
new file mode 100644
index 00000000000000..a4e8682cd9ee58
--- /dev/null
+++ b/lld/test/ELF/debug-names-parent-idx.s
@@ -0,0 +1,549 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %p/Inputs/debug-names-parent-idx-2.s -o %t2.o
+# RUN: ld.lld --debug-names %t1.o %t2.o -o %t
+
+# RUN: llvm-dwarfdump -debug-names %t | FileCheck %s --check-prefix=DWARF
+
+# DWARF: .debug_names contents:
+# DWARF: Name Index @ 0x0 {
+# DWARF-NEXT: Header {
+# DWARF-NEXT: Length: 0x15C
+# DWARF-NEXT: Format: DWARF32
+# DWARF-NEXT: Version: 5
+# DWARF-NEXT: CU count: 2
+# DWARF-NEXT: Local TU count: 0
+# DWARF-NEXT: Foreign TU count: 0
+# DWARF-NEXT: Bucket count: 9
+# DWARF-NEXT: Name count: 9
+# DWARF-NEXT: Abbreviations table size: 0x33
+# DWARF-NEXT: Augmentation: 'LLVM0700'
+# DWARF: Compilation Unit offsets [
+# DWARF-NEXT: CU[0]: 0x00000000
+# DWARF-NEXT: CU[1]: 0x000000cc
+# DWARF: Abbreviations [
+# DWARF-NEXT: Abbreviation 0x1 {
+# DWARF-NEXT: Tag: DW_TAG_base_type
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: Abbreviation 0x2 {
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: Abbreviation 0x3 {
+# DWARF-NEXT: Tag: DW_TAG_structure_type
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: Abbreviation 0x4 {
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: Abbreviation 0x5 {
+# DWARF-NEXT: Tag: DW_TAG_namespace
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: String: 0x00000093 "bar"
+# DWARF-NEXT: Entry @ 0xf7 {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF: String: 0x000000a9 "int"
+# DWARF-NEXT: Entry @ 0xfe {
+# DWARF-NEXT: Abbrev: 0x1
+# DWARF-NEXT: Tag: DW_TAG_base_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x0000008d
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF-NEXT: }
+# DWARF-NEXT: Entry @ 0x104 {
+# DWARF-NEXT: Abbrev: 0x1
+# DWARF-NEXT: Tag: DW_TAG_base_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF: String: 0x000000ad "foo"
+# DWARF-NEXT: Entry @ 0x10b {
+# DWARF-NEXT: Abbrev: 0x3
+# DWARF-NEXT: Tag: DW_TAG_structure_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000096
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF-NEXT: }
+# DWARF-NEXT: Entry @ 0x111 {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000027
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF-NEXT: }
+# DWARF-NEXT: Entry @ 0x117 {
+# DWARF-NEXT: Abbrev: 0x4
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000045
+# DWARF-NEXT: DW_IDX_parent: Entry @ 0x128
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF-NEXT: }
+# DWARF-NEXT: Entry @ 0x121 {
+# DWARF-NEXT: Abbrev: 0x3
+# DWARF-NEXT: Tag: DW_TAG_structure_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000056
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF: String: 0x00000196 "parent_test"
+# DWARF-NEXT: Entry @ 0x128 {
+# DWARF-NEXT: Abbrev: 0x5
+# DWARF-NEXT: Tag: DW_TAG_namespace
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000043
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF: String: 0x00000097 "_Z3barR3fooi"
+# DWARF-NEXT: Entry @ 0x12f {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF: String: 0x000000a4 "main"
+# DWARF-NEXT: Entry @ 0x136 {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000046
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF: String: 0x000000b5 "char"
+# DWARF-NEXT: Entry @ 0x13d {
+# DWARF-NEXT: Abbrev: 0x1
+# DWARF-NEXT: Tag: DW_TAG_base_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x000000b8
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF-NEXT: }
+# DWARF-NEXT: Entry @ 0x143 {
+# DWARF-NEXT: Abbrev: 0x1
+# DWARF-NEXT: Tag: DW_TAG_base_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000078
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF: String: 0x000001a2 "_ZN11parent_test3fooEv"
+# DWARF-NEXT: Entry @ 0x14a {
+# DWARF-NEXT: Abbrev: 0x4
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000045
+# DWARF-NEXT: DW_IDX_parent: Entry @ 0x128
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF: String: 0x0000018e "_Z3foov"
+# DWARF-NEXT: Entry @ 0x155 {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000027
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+
+#-- input file: debug-names-parent-idx.cpp
+## Generated with:
+##
+## - clang++ -g -O0 -gpubnames -fdebug-compilation-dir='parent-idx-test' \
+## -S debug-names-parent-idx.cpp -o debug-names-parent-idx.s
+##
+## foo.h contents:
+##
+## int foo();
+##
+## struct foo {
+## int x;
+## char y;
+## struct foo *foo_ptr;
+## };
+##
+## namespace parent_test {
+## int foo();
+## }
+##
+## debug-names-parent-idx.cpp contents:
+##
+## #include "foo.h"
+## void bar (struct foo &foo, int junk) {
+## foo.x = foo.x * junk;
+## }
+## int main (int argc, char** argv) {
+## struct foo my_struct;
+## my_struct.x = 10;
+## my_struct.y = 'q';
+## my_struct.foo_ptr = nullptr;
+## int junk = foo();
+## bar(my_struct, junk);
+## int junk2 = parent_test::foo();
+## return 0;
+## }
+##
+ .text
+ .globl _Z3barR3fooi # -- Begin function _Z3barR3fooi
+ .p2align 4, 0x90
+ .type _Z3barR3fooi, at function
+_Z3barR3fooi: # @_Z3barR3fooi
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ movq %rdi, -8(%rbp)
+ movl %esi, -12(%rbp)
+.Ltmp0:
+ movq -8(%rbp), %rax
+ movl (%rax), %ecx
+ imull -12(%rbp), %ecx
+ movq -8(%rbp), %rax
+ movl %ecx, (%rax)
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size _Z3barR3fooi, .Lfunc_end0-_Z3barR3fooi
+ .cfi_endproc
+ # -- End function
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin1:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ subq $48, %rsp
+ movl $0, -4(%rbp)
+ movl %edi, -8(%rbp)
+ movq %rsi, -16(%rbp)
+.Ltmp2:
+ movl $10, -32(%rbp)
+ movb $113, -28(%rbp)
+ movq $0, -24(%rbp)
+ callq _Z3foov at PLT
+ movl %eax, -36(%rbp)
+ movl -36(%rbp), %esi
+ leaq -32(%rbp), %rdi
+ callq _Z3barR3fooi
+ callq _ZN11parent_test3fooEv at PLT
+ movl %eax, -40(%rbp)
+ xorl %eax, %eax
+ addq $48, %rsp
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp3:
+.Lfunc_end1:
+ .size main, .Lfunc_end1-main
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0xc0 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end1-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0x23 DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 3 # DW_AT_linkage_name
+ .byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 3 # DW_AT_decl_line
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x2f:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 120
+ .byte 7 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 3 # DW_AT_decl_line
+ .long 145 # DW_AT_type
+ .byte 3 # Abbrev [3] 0x3a:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 116
+ .byte 12 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 3 # DW_AT_decl_line
+ .long 141 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x46:0x47 DW_TAG_subprogram
+ .byte 1 # DW_AT_low_pc
+ .long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 5 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 141 # DW_AT_type
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x55:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 120
+ .byte 13 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 141 # DW_AT_type
+ .byte 3 # Abbrev [3] 0x60:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 112
+ .byte 14 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 193 # DW_AT_type
+ .byte 5 # Abbrev [5] 0x6b:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 96
+ .byte 15 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 9 # DW_AT_decl_line
+ .long 150 # DW_AT_type
+ .byte 5 # Abbrev [5] 0x76:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 92
+ .byte 12 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 14 # DW_AT_decl_line
+ .long 141 # DW_AT_type
+ .byte 5 # Abbrev [5] 0x81:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 88
+ .byte 16 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 16 # DW_AT_decl_line
+ .long 141 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 6 # Abbrev [6] 0x8d:0x4 DW_TAG_base_type
+ .byte 6 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 7 # Abbrev [7] 0x91:0x5 DW_TAG_reference_type
+ .long 150 # DW_AT_type
+ .byte 8 # Abbrev [8] 0x96:0x22 DW_TAG_structure_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 7 # DW_AT_name
+ .byte 16 # DW_AT_byte_size
+ .byte 1 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .byte 9 # Abbrev [9] 0x9c:0x9 DW_TAG_member
+ .byte 8 # DW_AT_name
+ .long 141 # DW_AT_type
+ .byte 1 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .byte 0 # DW_AT_data_member_location
+ .byte 9 # Abbrev [9] 0xa5:0x9 DW_TAG_member
+ .byte 9 # DW_AT_name
+ .long 184 # DW_AT_type
+ .byte 1 # DW_AT_decl_file
+ .byte 6 # DW_AT_decl_line
+ .byte 4 # DW_AT_data_member_location
+ .byte 9 # Abbrev [9] 0xae:0x9 DW_TAG_member
+ .byte 11 # DW_AT_name
+ .long 188 # DW_AT_type
+ .byte 1 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .byte 8 # DW_AT_data_member_location
+ .byte 0 # End Of Children Mark
+ .byte 6 # Abbrev [6] 0xb8:0x4 DW_TAG_base_type
+ .byte 10 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 10 # Abbrev [10] 0xbc:0x5 DW_TAG_pointer_type
+ .long 150 # DW_AT_type
+ .byte 10 # Abbrev [10] 0xc1:0x5 DW_TAG_pointer_type
+ .long 198 # DW_AT_type
+ .byte 10 # Abbrev [10] 0xc6:0x5 DW_TAG_pointer_type
+ .long 184 # DW_AT_type
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 72 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)" # string offset=0
+.Linfo_string1:
+ .asciz "debug-names-parent-idx.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "parent-idx-test" # string offset=131
+.Linfo_string3:
+ .asciz "bar" # string offset=147
+.Linfo_string4:
+ .asciz "_Z3barR3fooi" # string offset=151
+.Linfo_string5:
+ .asciz "main" # string offset=164
+.Linfo_string6:
+ .asciz "int" # string offset=169
+.Linfo_string7:
+ .asciz "foo" # string offset=173
+.Linfo_string8:
+ .asciz "x" # string offset=177
+.Linfo_string9:
+ .asciz "y" # string offset=179
+.Linfo_string10:
+ .asciz "char" # string offset=181
+.Linfo_string11:
+ .asciz "foo_ptr" # string offset=186
+.Linfo_string12:
+ .asciz "junk" # string offset=194
+.Linfo_string13:
+ .asciz "argc" # string offset=199
+.Linfo_string14:
+ .asciz "argv" # string offset=204
+.Linfo_string15:
+ .asciz "my_struct" # string offset=209
+.Linfo_string16:
+ .asciz "junk2" # string offset=219
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+ .quad .Lfunc_begin1
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 6 # Header: bucket count
+ .long 6 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 1 # Bucket 0
+ .long 0 # Bucket 1
+ .long 2 # Bucket 2
+ .long 4 # Bucket 3
+ .long 5 # Bucket 4
+ .long 6 # Bucket 5
+ .long 193487034 # Hash in Bucket 0
+ .long 193495088 # Hash in Bucket 2
+ .long 1358986904 # Hash in Bucket 2
+ .long 193491849 # Hash in Bucket 3
+ .long 2090499946 # Hash in Bucket 4
+ .long 2090147939 # Hash in Bucket 5
+ .long .Linfo_string3 # String in Bucket 0: bar
+ .long .Linfo_string6 # String in Bucket 2: int
+ .long .Linfo_string4 # String in Bucket 2: _Z3barR3fooi
+ .long .Linfo_string7 # String in Bucket 3: foo
+ .long .Linfo_string5 # String in Bucket 4: main
+ .long .Linfo_string10 # String in Bucket 5: char
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 0
+ .long .Lnames3-.Lnames_entries0 # Offset in Bucket 2
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+ .long .Lnames4-.Lnames_entries0 # Offset in Bucket 3
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 4
+ .long .Lnames5-.Lnames_entries0 # Offset in Bucket 5
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 36 # DW_TAG_base_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 3 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L2:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: bar
+.Lnames3:
+.L1:
+ .byte 2 # Abbreviation code
+ .long 141 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+.Lnames1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _Z3barR3fooi
+.Lnames4:
+.L4:
+ .byte 3 # Abbreviation code
+ .long 150 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: foo
+.Lnames2:
+.L0:
+ .byte 1 # Abbreviation code
+ .long 70 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: main
+.Lnames5:
+.L3:
+ .byte 2 # Abbreviation code
+ .long 184 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: char
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .addrsig_sym _Z3barR3fooi
+ .addrsig_sym _Z3foov
+ .addrsig_sym _ZN11parent_test3fooEv
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/lld/test/ELF/debug-names.s b/lld/test/ELF/debug-names.s
new file mode 100644
index 00000000000000..ce013303f65f67
--- /dev/null
+++ b/lld/test/ELF/debug-names.s
@@ -0,0 +1,294 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %p/Inputs/debug-names-2.s -o %t2.o
+# RUN: ld.lld --debug-names %t1.o %t2.o -o %t
+
+# RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=DISASM
+# RUN: llvm-dwarfdump -debug-names %t | FileCheck %s --check-prefix=DWARF
+# RUN: llvm-readelf -SW %t | FileCheck %s --check-prefix=READELF
+
+# DISASM: Disassembly of section .text:
+# DISASM-EMPTY:
+# DISASM: <_Z2f12t1>:
+# DISASM-CHECK: 201180: 55 pushq %rbp
+# DISASM-CHECK: 201181: 48 89 e5 movq %rsp, %rbp
+# DISASM-CHECK: 201184: 5d popq %rbp
+# DISASM-CHECK: 201185: c3 retq
+# DISASM-CHECK: 201186: cc int3
+# DISASM-CHECK: 201187: cc int3
+# DISASM-CHECK: 201188: cc int3
+# DISASM-CHECK: 201189: cc int3
+# DISASM-CHECK: 20118a: cc int3
+# DISASM-CHECK: 20118b: cc int3
+# DISASM-CHECK: 20118c: cc int3
+# DISASM-CHECK: 20118d: cc int3
+# DISASM-CHECK: 20118e: cc int3
+# DISASM-CHECK: 20118f: cc int3
+# DISASM: <main>:
+# DISASM-CHECK: 201190: 55 pushq %rbp
+# DISASM-CHECK: 201191: 48 89 e5 movq %rsp, %rbp
+# DISASM-CHECK: 201194: 31 c0 xorl %eax, %eax
+# DISASM-CHECK: 201196: 5d popq %rbp
+# DISASM-CHECK: 201197: c3 retq
+
+# DWARF: .debug_names contents:
+# DWARF: Name Index @ 0x0 {
+# DWARF-NEXT: Header {
+# DWARF-NEXT: Length: 0xCC
+# DWARF-NEXT: Format: DWARF32
+# DWARF-NEXT: Version: 5
+# DWARF-NEXT: CU count: 2
+# DWARF-NEXT: Local TU count: 0
+# DWARF-NEXT: Foreign TU count: 0
+# DWARF-NEXT: Bucket count: 5
+# DWARF-NEXT: Name count: 5
+# DWARF-NEXT: Abbreviations table size: 0x1F
+# DWARF-NEXT: Augmentation: 'LLVM0700'
+# DWARF: Compilation Unit offsets [
+# DWARF-NEXT: CU[0]: 0x00000000
+# DWARF-NEXT: CU[1]: 0x00000041
+# DWARF: Abbreviations [
+# DWARF-NEXT: Abbreviation 0x1 {
+# DWARF: Tag: DW_TAG_structure_type
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: Abbreviation 0x2 {
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: Abbreviation 0x3 {
+# DWARF-NEXT: Tag: DW_TAG_base_type
+# DWARF-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# DWARF-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# DWARF-NEXT: DW_IDX_compile_unit: DW_FORM_data1
+# DWARF: Bucket 0 [
+# DWARF: Bucket 1 [
+# DWARF: String: 0x00000089 "f1"
+# DWARF-NEXT: Entry @ 0xa3 {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF: String: 0x00000095 "t1"
+# DWARF-NEXT: Entry @ 0xaa {
+# DWARF-NEXT: Abbrev: 0x1
+# DWARF-NEXT: Tag: DW_TAG_structure_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x0000003a
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF-NEXT: }
+# DWARF-NEXT: Entry @ 0xb0 {
+# DWARF-NEXT: Abbrev: 0x1
+# DWARF-NEXT: Tag: DW_TAG_structure_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000042
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF: String: 0x00000130 "int"
+# DWARF-NEXT: Entry @ 0xb7 {
+# DWARF-NEXT: Abbrev: 0x3
+# DWARF-NEXT: Tag: DW_TAG_base_type
+# DWARF-NEXT: DW_IDX_die_offset: 0x0000003e
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+# DWARF: Bucket 2 [
+# DWARF: Bucket 3 [
+# DWARF: String: 0x0000008c "_Z2f12t1"
+# DWARF-NEXT: Entry @ 0xbe {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x00
+# DWARF: Bucket 4 [
+# DWARF: String: 0x0000012b "main"
+# DWARF-NEXT: Entry @ 0xc5 {
+# DWARF-NEXT: Abbrev: 0x2
+# DWARF-NEXT: Tag: DW_TAG_subprogram
+# DWARF-NEXT: DW_IDX_die_offset: 0x00000023
+# DWARF-NEXT: DW_IDX_parent: <parent not indexed>
+# DWARF-NEXT: DW_IDX_compile_unit: 0x01
+
+# READELF: .debug_names PROGBITS 0000000000000000 0003eb 0000d0
+
+# RUN: ld.lld --debug-names --no-debug-names %t1.o %t2.o -o %t
+# RUN: llvm-readelf -SW %t | FileCheck %s --check-prefix=NO_DBG_NAMES
+
+
+# NO_DBG_NAMES: .debug_names PROGBITS 0000000000000000 00037c 000110
+
+#-- input file: debug-names.cpp
+## Generated with:
+##
+## - clang++ -g -O0 -gpubnames -fdebug-compilation-dir='debug-names-test' \
+## -S debug-names.cpp -o debug-names.s
+##
+## debug-names.cpp contents:
+##
+## struct t1 { };
+## void f1(t1) { }
+##
+##
+ .text
+ .globl _Z2f12t1 # -- Begin function _Z2f12t1
+ .p2align 4, 0x90
+ .type _Z2f12t1, at function
+_Z2f12t1: # @_Z2f12t1
+.Lfunc_begin0:
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+.Ltmp0:
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size _Z2f12t1, .Lfunc_end0-_Z2f12t1
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x35 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 2 # Abbrev [2] 0x23:0x17 DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 3 # DW_AT_linkage_name
+ .byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x2f:0xa DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 127
+ .byte 0 # DW_AT_decl_file
+ .byte 2 # DW_AT_decl_line
+ .long 58 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x3a:0x6 DW_TAG_structure_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 5 # DW_AT_name
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 28 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)" # string offset=0
+.Linfo_string1:
+ .asciz "debug-names.cpp" # string offset=104
+.Linfo_string2:
+ .asciz "debug-names-test" # string offset=120
+.Linfo_string3:
+ .asciz "f1" # string offset=137
+.Linfo_string4:
+ .asciz "_Z2f12t1" # string offset=140
+.Linfo_string5:
+ .asciz "t1" # string offset=149
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_names,"", at progbits
+ .long .Lnames_end0-.Lnames_start0 # Header: unit length
+.Lnames_start0:
+ .short 5 # Header: version
+ .short 0 # Header: padding
+ .long 1 # Header: compilation unit count
+ .long 0 # Header: local type unit count
+ .long 0 # Header: foreign type unit count
+ .long 3 # Header: bucket count
+ .long 3 # Header: name count
+ .long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
+ .long 8 # Header: augmentation string size
+ .ascii "LLVM0700" # Header: augmentation string
+ .long .Lcu_begin0 # Compilation unit 0
+ .long 0 # Bucket 0
+ .long 1 # Bucket 1
+ .long 3 # Bucket 2
+ .long 5863324 # Hash in Bucket 1
+ .long 5863786 # Hash in Bucket 1
+ .long 1398125246 # Hash in Bucket 2
+ .long .Linfo_string3 # String in Bucket 1: f1
+ .long .Linfo_string5 # String in Bucket 1: t1
+ .long .Linfo_string4 # String in Bucket 2: _Z2f12t1
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 46 # DW_TAG_subprogram
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 2 # Abbrev code
+ .byte 19 # DW_TAG_structure_type
+ .byte 3 # DW_IDX_die_offset
+ .byte 19 # DW_FORM_ref4
+ .byte 4 # DW_IDX_parent
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev
+ .byte 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames0:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: f1
+.Lnames2:
+.L0:
+ .byte 2 # Abbreviation code
+ .long 58 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: t1
+.Lnames1:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _Z2f12t1
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 19.0.0git (git at github.com:llvm/llvm-project.git 4df364bc93af49ae413ec1ae8328f34ac70730c4)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
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