[llvm] [BOLT][DWARF] Add support for transitive DW_AT_name/DW_AT_linkage_name resolution for DW_AT_name/DW_AT_linkage_name. (PR #119493)
Alexander Yermolovich via llvm-commits
llvm-commits at lists.llvm.org
Wed Dec 11 10:51:04 PST 2024
https://github.com/ayermolo updated https://github.com/llvm/llvm-project/pull/119493
>From 16c93bad49a857227667e2c79a5848320d88be90 Mon Sep 17 00:00:00 2001
From: Alexander Yermolovich <ayermolo at meta.com>
Date: Mon, 9 Dec 2024 16:34:34 -0800
Subject: [PATCH 1/2] refactor + support abstr chain
Summary:
Test Plan:
Reviewers:
Subscribers:
Tasks:
Tags:
Differential Revision: https://phabricator.intern.facebook.com/D67007861
---
bolt/include/bolt/Core/DIEBuilder.h | 2 +-
bolt/include/bolt/Core/DebugNames.h | 29 +-
bolt/lib/Core/DIEBuilder.cpp | 4 +-
bolt/lib/Core/DebugNames.cpp | 311 ++++---
...-names-abstract-origin-linkage-name-only.s | 568 ++++++++++++
...ebug-names-abstract-origin-specification.s | 829 ++++++++++++++++++
6 files changed, 1608 insertions(+), 135 deletions(-)
create mode 100644 bolt/test/X86/dwarf5-debug-names-abstract-origin-linkage-name-only.s
create mode 100644 bolt/test/X86/dwarf5-debug-names-abstract-origin-specification.s
diff --git a/bolt/include/bolt/Core/DIEBuilder.h b/bolt/include/bolt/Core/DIEBuilder.h
index d1acba0f26c78f..bd22c536c56fca 100644
--- a/bolt/include/bolt/Core/DIEBuilder.h
+++ b/bolt/include/bolt/Core/DIEBuilder.h
@@ -162,7 +162,7 @@ class DIEBuilder {
/// Clone an attribute in reference format.
void cloneDieOffsetReferenceAttribute(
- DIE &Die, const DWARFUnit &U, const DWARFDie &InputDIE,
+ DIE &Die, DWARFUnit &U, const DWARFDie &InputDIE,
const DWARFAbbreviationDeclaration::AttributeSpec AttrSpec, uint64_t Ref);
/// Clone an attribute in block format.
diff --git a/bolt/include/bolt/Core/DebugNames.h b/bolt/include/bolt/Core/DebugNames.h
index 0e61a0e4f9d9f0..cc4e13a481b2d6 100644
--- a/bolt/include/bolt/Core/DebugNames.h
+++ b/bolt/include/bolt/Core/DebugNames.h
@@ -72,8 +72,8 @@ class DWARF5AcceleratorTable {
return std::move(FullTableBuffer);
}
/// Adds a DIE that is referenced across CUs.
- void addCrossCUDie(const DIE *Die) {
- CrossCUDies.insert({Die->getOffset(), Die});
+ void addCrossCUDie(DWARFUnit *Unit, const DIE *Die) {
+ CrossCUDies.insert({Die->getOffset(), {Unit, Die}});
}
/// Returns true if the DIE can generate an entry for a cross cu reference.
/// This only checks TAGs of a DIE because when this is invoked DIE might not
@@ -145,7 +145,7 @@ class DWARF5AcceleratorTable {
llvm::DenseMap<uint64_t, uint32_t> CUOffsetsToPatch;
// Contains a map of Entry ID to Entry relative offset.
llvm::DenseMap<uint64_t, uint32_t> EntryRelativeOffsets;
- llvm::DenseMap<uint64_t, const DIE *> CrossCUDies;
+ llvm::DenseMap<uint64_t, std::pair<DWARFUnit *, const DIE *>> CrossCUDies;
/// Adds Unit to either CUList, LocalTUList or ForeignTUList.
/// Input Unit being processed, and DWO ID if Unit is being processed comes
/// from a DWO section.
@@ -191,6 +191,29 @@ class DWARF5AcceleratorTable {
void emitData();
/// Emit augmentation string.
void emitAugmentationString() const;
+ /// Creates a new entry for a given DIE.
+ std::optional<BOLTDWARF5AccelTableData *>
+ addEntry(DWARFUnit &DU, const DIE &CurrDie,
+ const std::optional<uint64_t> &DWOID,
+ const std::optional<BOLTDWARF5AccelTableData *> &Parent,
+ const std::optional<std::string> &Name,
+ const uint32_t NumberParentsInChain);
+ /// Returns UnitID for a given DWARFUnit.
+ uint32_t getUnitID(const DWARFUnit &Unit,
+ const std::optional<uint64_t> &DWOID, bool &IsTU);
+ std::optional<std::string> getName(DWARFUnit &DU,
+ const std::optional<uint64_t> &DWOID,
+ const std::string &NameToUse,
+ DIEValue ValName);
+ /// Processes a DIE with references to other DIEs for DW_AT_name and
+ /// DW_AT_linkage_name resolution.
+ /// If DW_AT_name exists method creates a new entry for this DIE and returns
+ /// it.
+ std::optional<BOLTDWARF5AccelTableData *> processReferencedDie(
+ DWARFUnit &Unit, const DIE &Die, const std::optional<uint64_t> &DWOID,
+ const std::optional<BOLTDWARF5AccelTableData *> &Parent,
+ const std::string &NameToUse, const uint32_t NumberParentsInChain,
+ const dwarf::Attribute &Attr);
};
} // namespace bolt
} // namespace llvm
diff --git a/bolt/lib/Core/DIEBuilder.cpp b/bolt/lib/Core/DIEBuilder.cpp
index 414912ea1c2076..80ad583e079d49 100644
--- a/bolt/lib/Core/DIEBuilder.cpp
+++ b/bolt/lib/Core/DIEBuilder.cpp
@@ -622,7 +622,7 @@ DWARFDie DIEBuilder::resolveDIEReference(
}
void DIEBuilder::cloneDieOffsetReferenceAttribute(
- DIE &Die, const DWARFUnit &U, const DWARFDie &InputDIE,
+ DIE &Die, DWARFUnit &U, const DWARFDie &InputDIE,
const DWARFAbbreviationDeclaration::AttributeSpec AttrSpec, uint64_t Ref) {
DIE *NewRefDie = nullptr;
DWARFUnit *RefUnit = nullptr;
@@ -654,7 +654,7 @@ void DIEBuilder::cloneDieOffsetReferenceAttribute(
// Adding referenced DIE to DebugNames to be used when entries are created
// that contain cross cu references.
if (DebugNamesTable.canGenerateEntryWithCrossCUReference(U, Die, AttrSpec))
- DebugNamesTable.addCrossCUDie(DieInfo.Die);
+ DebugNamesTable.addCrossCUDie(&U, DieInfo.Die);
// no matter forward reference or backward reference, we are supposed
// to calculate them in `finish` due to the possible modification of
// the DIE.
diff --git a/bolt/lib/Core/DebugNames.cpp b/bolt/lib/Core/DebugNames.cpp
index 280c7c505eeda1..b9ea1765e39b6f 100644
--- a/bolt/lib/Core/DebugNames.cpp
+++ b/bolt/lib/Core/DebugNames.cpp
@@ -222,134 +222,114 @@ static uint64_t getEntryID(const BOLTDWARF5AccelTableData &Entry) {
return reinterpret_cast<uint64_t>(&Entry);
}
-std::optional<BOLTDWARF5AccelTableData *>
-DWARF5AcceleratorTable::addAccelTableEntry(
- DWARFUnit &Unit, const DIE &Die, const std::optional<uint64_t> &DWOID,
- const uint32_t NumberParentsInChain,
- std::optional<BOLTDWARF5AccelTableData *> &Parent) {
- if (Unit.getVersion() < 5 || !NeedToCreate)
- return std::nullopt;
- std::string NameToUse = "";
-
- auto getUnitID = [&](const DWARFUnit &Unit, bool &IsTU,
- uint32_t &DieTag) -> uint32_t {
- IsTU = Unit.isTypeUnit();
- DieTag = Die.getTag();
- if (IsTU) {
- if (DWOID) {
- const uint64_t TUHash = cast<DWARFTypeUnit>(&Unit)->getTypeHash();
- auto Iter = TUHashToIndexMap.find(TUHash);
- assert(Iter != TUHashToIndexMap.end() &&
- "Could not find TU hash in map");
- return Iter->second;
- }
- return LocalTUList.size() - 1;
+uint32_t DWARF5AcceleratorTable::getUnitID(const DWARFUnit &Unit,
+ const std::optional<uint64_t> &DWOID,
+ bool &IsTU) {
+ IsTU = Unit.isTypeUnit();
+ if (IsTU) {
+ if (DWOID) {
+ const uint64_t TUHash = cast<DWARFTypeUnit>(&Unit)->getTypeHash();
+ auto Iter = TUHashToIndexMap.find(TUHash);
+ assert(Iter != TUHashToIndexMap.end() && "Could not find TU hash in map");
+ return Iter->second;
}
- return CUList.size() - 1;
- };
+ return LocalTUList.size() - 1;
+ }
+ return CUList.size() - 1;
+}
- if (!canProcess(Unit, Die, NameToUse, false))
+std::optional<std::string> DWARF5AcceleratorTable::getName(
+ DWARFUnit &Unit, const std::optional<uint64_t> &DWOID,
+ const std::string &NameToUse, DIEValue ValName) {
+ if ((!ValName || ValName.getForm() == dwarf::DW_FORM_string) &&
+ NameToUse.empty())
return std::nullopt;
-
- // Addes a Unit to either CU, LocalTU or ForeignTU list the first time we
- // encounter it.
- // Invoking it here so that we don't add Units that don't have any entries.
- if (&Unit != CurrentUnit) {
- CurrentUnit = &Unit;
- addUnit(Unit, DWOID);
+ std::string Name = "";
+ uint64_t NameIndexOffset = 0;
+ if (NameToUse.empty()) {
+ NameIndexOffset = ValName.getDIEInteger().getValue();
+ if (ValName.getForm() != dwarf::DW_FORM_strp)
+ NameIndexOffset = getNameOffset(BC, Unit, NameIndexOffset);
+ // Counts on strings end with '\0'.
+ Name = std::string(&StrSection.data()[NameIndexOffset]);
+ } else {
+ Name = NameToUse;
}
-
- auto getName = [&](DIEValue ValName) -> std::optional<std::string> {
- if ((!ValName || ValName.getForm() == dwarf::DW_FORM_string) &&
- NameToUse.empty())
- return std::nullopt;
- std::string Name = "";
- uint64_t NameIndexOffset = 0;
- if (NameToUse.empty()) {
- NameIndexOffset = ValName.getDIEInteger().getValue();
- if (ValName.getForm() != dwarf::DW_FORM_strp)
- NameIndexOffset = getNameOffset(BC, Unit, NameIndexOffset);
- // Counts on strings end with '\0'.
- Name = std::string(&StrSection.data()[NameIndexOffset]);
- } else {
- Name = NameToUse;
- }
- auto &It = Entries[Name];
- if (It.Values.empty()) {
- if (DWOID && NameToUse.empty()) {
- // For DWO Unit the offset is in the .debug_str.dwo section.
- // Need to find offset for the name in the .debug_str section.
- llvm::hash_code Hash = llvm::hash_value(llvm::StringRef(Name));
- auto ItCache = StrCacheToOffsetMap.find(Hash);
- if (ItCache == StrCacheToOffsetMap.end())
- NameIndexOffset = MainBinaryStrWriter.addString(Name);
- else
- NameIndexOffset = ItCache->second;
- }
- if (!NameToUse.empty())
+ auto &It = Entries[Name];
+ if (It.Values.empty()) {
+ if (DWOID && NameToUse.empty()) {
+ // For DWO Unit the offset is in the .debug_str.dwo section.
+ // Need to find offset for the name in the .debug_str section.
+ llvm::hash_code Hash = llvm::hash_value(llvm::StringRef(Name));
+ auto ItCache = StrCacheToOffsetMap.find(Hash);
+ if (ItCache == StrCacheToOffsetMap.end())
NameIndexOffset = MainBinaryStrWriter.addString(Name);
- It.StrOffset = NameIndexOffset;
- // This the same hash function used in DWARF5AccelTableData.
- It.HashValue = caseFoldingDjbHash(Name);
+ else
+ NameIndexOffset = ItCache->second;
}
- return Name;
- };
+ if (!NameToUse.empty())
+ NameIndexOffset = MainBinaryStrWriter.addString(Name);
+ It.StrOffset = NameIndexOffset;
+ // This the same hash function used in DWARF5AccelTableData.
+ It.HashValue = caseFoldingDjbHash(Name);
+ }
+ return Name;
+}
- auto addEntry =
- [&](DIEValue ValName) -> std::optional<BOLTDWARF5AccelTableData *> {
- std::optional<std::string> Name = getName(ValName);
- if (!Name)
- return std::nullopt;
+std::optional<BOLTDWARF5AccelTableData *> DWARF5AcceleratorTable::addEntry(
+ DWARFUnit &DU, const DIE &CurrDie, const std::optional<uint64_t> &DWOID,
+ const std::optional<BOLTDWARF5AccelTableData *> &Parent,
+ const std::optional<std::string> &Name,
+ const uint32_t NumberParentsInChain) {
+ if (!Name)
+ return std::nullopt;
- auto &It = Entries[*Name];
- bool IsTU = false;
- uint32_t DieTag = 0;
- uint32_t UnitID = getUnitID(Unit, IsTU, DieTag);
- std::optional<unsigned> SecondIndex = std::nullopt;
- if (IsTU && DWOID) {
- auto Iter = CUOffsetsToPatch.find(*DWOID);
- if (Iter == CUOffsetsToPatch.end())
- BC.errs() << "BOLT-WARNING: [internal-dwarf-warning]: Could not find "
- "DWO ID in CU offsets for second Unit Index "
- << *Name << ". For DIE at offset: "
- << Twine::utohexstr(CurrentUnitOffset + Die.getOffset())
- << ".\n";
- SecondIndex = Iter->second;
- }
- std::optional<uint64_t> ParentOffset =
- (Parent ? std::optional<uint64_t>(getEntryID(**Parent)) : std::nullopt);
- // This will be populated later in writeEntry.
- // This way only parent entries get tracked.
- // Keeping memory footprint down.
- if (ParentOffset)
- EntryRelativeOffsets.insert({*ParentOffset, 0});
- bool IsParentRoot = false;
- // If there is no parent and no valid Entries in parent chain this is a root
- // to be marked with a flag.
- if (!Parent && !NumberParentsInChain)
- IsParentRoot = true;
- It.Values.push_back(new (Allocator) BOLTDWARF5AccelTableData(
- Die.getOffset(), ParentOffset, DieTag, UnitID, IsParentRoot, IsTU,
- SecondIndex));
- return It.Values.back();
- };
+ auto &It = Entries[*Name];
+ bool IsTU = false;
+ uint32_t DieTag = CurrDie.getTag();
+ uint32_t UnitID = getUnitID(DU, DWOID, IsTU);
+ std::optional<unsigned> SecondIndex = std::nullopt;
+ if (IsTU && DWOID) {
+ auto Iter = CUOffsetsToPatch.find(*DWOID);
+ if (Iter == CUOffsetsToPatch.end())
+ BC.errs() << "BOLT-WARNING: [internal-dwarf-warning]: Could not find "
+ "DWO ID in CU offsets for second Unit Index "
+ << *Name << ". For DIE at offset: "
+ << Twine::utohexstr(CurrentUnitOffset + CurrDie.getOffset())
+ << ".\n";
+ SecondIndex = Iter->second;
+ }
+ std::optional<uint64_t> ParentOffset =
+ (Parent ? std::optional<uint64_t>(getEntryID(**Parent)) : std::nullopt);
+ // This will be populated later in writeEntry.
+ // This way only parent entries get tracked.
+ // Keeping memory footprint down.
+ if (ParentOffset)
+ EntryRelativeOffsets.insert({*ParentOffset, 0});
+ bool IsParentRoot = false;
+ // If there is no parent and no valid Entries in parent chain this is a root
+ // to be marked with a flag.
+ if (!Parent && !NumberParentsInChain)
+ IsParentRoot = true;
+ It.Values.push_back(new (Allocator) BOLTDWARF5AccelTableData(
+ CurrDie.getOffset(), ParentOffset, DieTag, UnitID, IsParentRoot, IsTU,
+ SecondIndex));
+ return It.Values.back();
+}
- // Minor optimization not to add entry twice for DW_TAG_namespace if it has no
- // DW_AT_name.
- if (!(Die.getTag() == dwarf::DW_TAG_namespace &&
- !Die.findAttribute(dwarf::Attribute::DW_AT_name)))
- addEntry(Die.findAttribute(dwarf::Attribute::DW_AT_linkage_name));
- // For the purposes of determining whether a debugging information entry has a
- // particular attribute (such as DW_AT_name), if debugging information entry A
- // has a DW_AT_specification or DW_AT_abstract_origin attribute pointing to
- // another debugging information entry B, any attributes of B are considered
- // to be part of A.
- auto processReferencedDie = [&](const dwarf::Attribute &Attr)
- -> std::optional<BOLTDWARF5AccelTableData *> {
- const DIEValue Value = Die.findAttribute(Attr);
+std::optional<BOLTDWARF5AccelTableData *>
+DWARF5AcceleratorTable::processReferencedDie(
+ DWARFUnit &Unit, const DIE &Die, const std::optional<uint64_t> &DWOID,
+ const std::optional<BOLTDWARF5AccelTableData *> &Parent,
+ const std::string &NameToUse, const uint32_t NumberParentsInChain,
+ const dwarf::Attribute &Attr) {
+ DIEValue Value = Die.findAttribute(Attr);
+ if (!Value)
+ return std::nullopt;
+ auto getReferenceDie = [&](const DIEValue &Value, const DIE *RefDieUsed)
+ -> std::optional<std::pair<DWARFUnit *, const DIE *>> {
if (!Value)
return std::nullopt;
- const DIE *EntryDie = nullptr;
if (Value.getForm() == dwarf::DW_FORM_ref_addr) {
auto Iter = CrossCUDies.find(Value.getDIEInteger().getValue());
if (Iter == CrossCUDies.end()) {
@@ -359,24 +339,97 @@ DWARF5AcceleratorTable::addAccelTableEntry(
<< ".\n";
return std::nullopt;
}
- EntryDie = Iter->second;
- } else {
- const DIEEntry &DIEENtry = Value.getDIEEntry();
- EntryDie = &DIEENtry.getEntry();
+ return Iter->second;
}
-
- addEntry(EntryDie->findAttribute(dwarf::Attribute::DW_AT_linkage_name));
- return addEntry(EntryDie->findAttribute(dwarf::Attribute::DW_AT_name));
+ const DIEEntry &DIEENtry = Value.getDIEEntry();
+ return {{&Unit, &DIEENtry.getEntry()}};
};
- if (std::optional<BOLTDWARF5AccelTableData *> Entry =
- processReferencedDie(dwarf::Attribute::DW_AT_abstract_origin))
+ DIEValue AttrValLinkageName;
+ DIEValue AttrValName = Die.findAttribute(dwarf::Attribute::DW_AT_name);
+ DWARFUnit *RefUnit = &Unit;
+ const DIE *RefDieUsed = &Die;
+ // It is possible to have DW_TAG_subprogram only with DW_AT_linkage_name that
+ // DW_AT_abstract_origin/DW_AT_specification point to.
+ while (!AttrValName) {
+ std::optional<std::pair<DWARFUnit *, const DIE *>> RefDUDie =
+ getReferenceDie(Value, RefDieUsed);
+ if (!RefDUDie)
+ break;
+ RefUnit = RefDUDie->first;
+ const DIE &RefDie = *RefDUDie->second;
+ RefDieUsed = &RefDie;
+ if (!AttrValLinkageName)
+ AttrValLinkageName =
+ RefDie.findAttribute(dwarf::Attribute::DW_AT_linkage_name);
+ AttrValName = RefDie.findAttribute(dwarf::Attribute::DW_AT_name);
+ Value = RefDie.findAttribute(dwarf::Attribute::DW_AT_abstract_origin);
+ if (!Value)
+ Value = RefDie.findAttribute(dwarf::Attribute::DW_AT_specification);
+ }
+ addEntry(Unit, Die, DWOID, Parent,
+ getName(*RefUnit, DWOID, NameToUse, AttrValLinkageName),
+ NumberParentsInChain);
+ return addEntry(Unit, Die, DWOID, Parent,
+ getName(*RefUnit, DWOID, NameToUse, AttrValName),
+ NumberParentsInChain);
+}
+
+std::optional<BOLTDWARF5AccelTableData *>
+DWARF5AcceleratorTable::addAccelTableEntry(
+ DWARFUnit &Unit, const DIE &Die, const std::optional<uint64_t> &DWOID,
+ const uint32_t NumberParentsInChain,
+ std::optional<BOLTDWARF5AccelTableData *> &Parent) {
+ if (Unit.getVersion() < 5 || !NeedToCreate)
+ return std::nullopt;
+ std::string NameToUse = "";
+
+ if (!canProcess(Unit, Die, NameToUse, false))
+ return std::nullopt;
+
+ // Addes a Unit to either CU, LocalTU or ForeignTU list the first time we
+ // encounter it.
+ // Invoking it here so that we don't add Units that don't have any entries.
+ if (&Unit != CurrentUnit) {
+ CurrentUnit = &Unit;
+ addUnit(Unit, DWOID);
+ }
+
+ // Minor optimization not to add entry twice for DW_TAG_namespace if it has no
+ // DW_AT_name.
+ std::optional<BOLTDWARF5AccelTableData *> LinkageEntry = std::nullopt;
+ DIEValue NameVal = Die.findAttribute(dwarf::Attribute::DW_AT_name);
+ DIEValue LinkageNameVal =
+ Die.findAttribute(dwarf::Attribute::DW_AT_linkage_name);
+ if (!(Die.getTag() == dwarf::DW_TAG_namespace && !NameVal))
+ LinkageEntry = addEntry(Unit, Die, DWOID, Parent,
+ getName(Unit, DWOID, NameToUse, LinkageNameVal),
+ NumberParentsInChain);
+
+ std::optional<BOLTDWARF5AccelTableData *> NameEntry =
+ addEntry(Unit, Die, DWOID, Parent,
+ getName(Unit, DWOID, NameToUse, NameVal), NumberParentsInChain);
+ if (NameEntry)
+ return NameEntry;
+
+ // The DIE doesn't have DW_AT_name or DW_AT_linkage_name, so we need to see if
+ // we can follow other attributes to find them. For the purposes of
+ // determining whether a debugging information entry has a particular
+ // attribute (such as DW_AT_name), if debugging information entry A has a
+ // DW_AT_specification or DW_AT_abstract_origin attribute pointing to another
+ // debugging information entry B, any attributes of B are considered to be
+ // part of A.
+ if (std::optional<BOLTDWARF5AccelTableData *> Entry = processReferencedDie(
+ Unit, Die, DWOID, Parent, NameToUse, NumberParentsInChain,
+ dwarf::Attribute::DW_AT_abstract_origin))
return *Entry;
- if (std::optional<BOLTDWARF5AccelTableData *> Entry =
- processReferencedDie(dwarf::Attribute::DW_AT_specification))
+ if (std::optional<BOLTDWARF5AccelTableData *> Entry = processReferencedDie(
+ Unit, Die, DWOID, Parent, NameToUse, NumberParentsInChain,
+ dwarf::Attribute::DW_AT_specification))
return *Entry;
- return addEntry(Die.findAttribute(dwarf::Attribute::DW_AT_name));
+ // This point can be hit by DW_TAG_varialbe that has no DW_AT_name.
+ return std::nullopt;
}
/// Algorithm from llvm implementation.
diff --git a/bolt/test/X86/dwarf5-debug-names-abstract-origin-linkage-name-only.s b/bolt/test/X86/dwarf5-debug-names-abstract-origin-linkage-name-only.s
new file mode 100644
index 00000000000000..8c9817ce91edb3
--- /dev/null
+++ b/bolt/test/X86/dwarf5-debug-names-abstract-origin-linkage-name-only.s
@@ -0,0 +1,568 @@
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %s -o %tmain.o
+# RUN: %clang %cflags -gdwarf-5 %tmain.o -o %tmain.exe
+# RUN: llvm-bolt %tmain.exe -o %tmain.exe.bolt --update-debug-sections
+# RUN: llvm-dwarfdump --debug-names %tmain.exe.bolt > %tlog.txt
+# RUN: cat %tlog.txt | FileCheck -check-prefix=BOLT %s
+
+## Tests that bolt can correctly generate debug_names when there is an DW_TAG_inlined_subroutine
+## with DW_AT_abstract_origin that points to DW_TAG_subprogram that only has DW_AT_linkage_name.
+
+# BOLT: Name Index @ 0x0 {
+# BOLT-NEXT: Header {
+# BOLT-NEXT: Length: 0xA2
+# BOLT-NEXT: Format: DWARF32
+# BOLT-NEXT: Version: 5
+# BOLT-NEXT: CU count: 1
+# BOLT-NEXT: Local TU count: 0
+# BOLT-NEXT: Foreign TU count: 0
+# BOLT-NEXT: Bucket count: 4
+# BOLT-NEXT: Name count: 4
+# BOLT-NEXT: Abbreviations table size: 0x19
+# BOLT-NEXT: Augmentation: 'BOLT'
+# BOLT-NEXT: }
+# BOLT-NEXT: Compilation Unit offsets [
+# BOLT-NEXT: CU[0]: 0x00000000
+# BOLT-NEXT: ]
+# BOLT-NEXT: Abbreviations [
+# BOLT-NEXT: Abbreviation [[ABBREV1:0x[0-9a-f]*]] {
+# BOLT-NEXT: Tag: DW_TAG_base_type
+# BOLT-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# BOLT-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# BOLT-NEXT: }
+# BOLT-NEXT: Abbreviation [[ABBREV2:0x[0-9a-f]*]] {
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# BOLT-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# BOLT-NEXT: }
+# BOLT-NEXT: Abbreviation [[ABBREV3:0x[0-9a-f]*]] {
+# BOLT-NEXT: Tag: DW_TAG_inlined_subroutine
+# BOLT-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# BOLT-NEXT: DW_IDX_parent: DW_FORM_ref4
+# BOLT-NEXT: }
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 0 [
+# BOLT-NEXT: Name 1 {
+# BOLT-NEXT: Hash: 0xB888030
+# BOLT-NEXT: String: {{.+}} "int"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: 0x1
+# BOLT-NEXT: Tag: DW_TAG_base_type
+# BOLT-NEXT: DW_IDX_die_offset: 0x0000004a
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 1 [
+# BOLT-NEXT: EMPTY
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 2 [
+# BOLT-NEXT: Name 2 {
+# BOLT-NEXT: Hash: 0x7C9A7F6A
+# BOLT-NEXT: String: {{.+}} "main"
+# BOLT-NEXT: Entry @ [[REF1:0x[0-9a-f]*]] {
+# BOLT-NEXT: Abbrev: [[ABBREV2]]
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: 0x0000004e
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: Name 3 {
+# BOLT-NEXT: Hash: 0xB5063CFE
+# BOLT-NEXT: String: {{.+}} "_Z3fooi"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV2]]
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: 0x00000024
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: Entry @ 0x96 {
+# BOLT-NEXT: Abbrev: [[ABBREV3]]
+# BOLT-NEXT: Tag: DW_TAG_inlined_subroutine
+# BOLT-NEXT: DW_IDX_die_offset: 0x0000007e
+# BOLT-NEXT: DW_IDX_parent: Entry @ [[REF1]]
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 3 [
+# BOLT-NEXT: Name 4 {
+# BOLT-NEXT: Hash: 0x7C952063
+# BOLT-NEXT: String: {{.+}} "char"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV1]]
+# BOLT-NEXT: Tag: DW_TAG_base_type
+# BOLT-NEXT: DW_IDX_die_offset: 0x0000009f
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+
+## int foo(int i) {
+## return i ++;
+## }
+## int main(int argc, char* argv[]) {
+## int i = 0;
+## [[clang::always_inline]] i = foo(argc);
+## return i;
+## }
+## Test was manually modified so that DW_TAG_subprogram only had DW_AT_linkage_name.
+
+ .text
+ .file "main.cpp"
+ .globl _Z3fooi
+ .p2align 4, 0x90
+ .type _Z3fooi, at function
+_Z3fooi:
+.Lfunc_begin0:
+ .file 0 "/abstractChain" "main.cpp" md5 0x2e29d55fc1320801a8057a4c50643ea1
+ .loc 0 1 0
+ .loc 0 2 12 prologue_end
+ .loc 0 2 3 epilogue_begin is_stmt 0
+ retq
+.Lfunc_end0:
+ .size _Z3fooi, .Lfunc_end0-_Z3fooi
+
+ .globl main
+ .p2align 4, 0x90
+ .type main, at function
+main:
+.Lfunc_begin1:
+ .loc 0 4 0 is_stmt 1
+.Ltmp2:
+ .loc 0 5 7 prologue_end
+ .loc 0 6 36
+ movl -12(%rbp), %eax
+.Ltmp3:
+ .loc 0 2 12
+.Ltmp4:
+ .loc 0 6 30
+ .loc 0 7 10
+ .loc 0 7 3 epilogue_begin is_stmt 0
+ retq
+.Ltmp5:
+.Lfunc_end1:
+ .size main, .Lfunc_end1-main
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 1 # Abbreviation Code
+ .byte 17 # DW_TAG_compile_unit
+ .byte 1 # DW_CHILDREN_yes
+ .byte 37 # DW_AT_producer
+ .byte 37 # DW_FORM_strx1
+ .byte 19 # DW_AT_language
+ .byte 5 # DW_FORM_data2
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 114 # DW_AT_str_offsets_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 16 # DW_AT_stmt_list
+ .byte 23 # DW_FORM_sec_offset
+ .byte 27 # DW_AT_comp_dir
+ .byte 37 # DW_FORM_strx1
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 115 # DW_AT_addr_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 2 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 64 # DW_AT_frame_base
+ .byte 24 # DW_FORM_exprloc
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 4 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 110 # DW_AT_linkage_name
+ .byte 37 # DW_FORM_strx1
+ #.byte 3 # DW_AT_name
+ #.byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 32 # DW_AT_inline
+ .byte 33 # DW_FORM_implicit_const
+ .byte 1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 5 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 6 # Abbreviation Code
+ .byte 36 # DW_TAG_base_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 62 # DW_AT_encoding
+ .byte 11 # DW_FORM_data1
+ .byte 11 # DW_AT_byte_size
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 7 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 64 # DW_AT_frame_base
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 8 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 9 # Abbreviation Code
+ .byte 52 # DW_TAG_variable
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 10 # Abbreviation Code
+ .byte 29 # DW_TAG_inlined_subroutine
+ .byte 1 # DW_CHILDREN_yes
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 88 # DW_AT_call_file
+ .byte 11 # DW_FORM_data1
+ .byte 89 # DW_AT_call_line
+ .byte 11 # DW_FORM_data1
+ .byte 87 # DW_AT_call_column
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 11 # Abbreviation Code
+ .byte 15 # DW_TAG_pointer_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .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:0x98 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] 0x23:0x15 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
+ .long 56 # DW_AT_abstract_origin
+ .byte 3 # Abbrev [3] 0x2f:0x8 DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 124
+ .long 64 # DW_AT_abstract_origin Manually Modified
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x38:0x12 DW_TAG_subprogram
+ .byte 3 # DW_AT_linkage_name
+ #.byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 74 # DW_AT_type
+ # DW_AT_external
+ # DW_AT_inline
+ .byte 5 # Abbrev [5] 0x41:0x8 DW_TAG_formal_parameter
+ .byte 6 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 74 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 6 # Abbrev [6] 0x4a:0x4 DW_TAG_base_type
+ .byte 5 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 7 # Abbrev [7] 0x4e: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 7 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .long 73 # DW_AT_type Manually Modified
+ # DW_AT_external
+ .byte 8 # Abbrev [8] 0x5d:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 116
+ .byte 8 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .long 73 # DW_AT_type Manually Modified
+ .byte 8 # Abbrev [8] 0x68:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 104
+ .byte 9 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .long 148 # DW_AT_type Manually Modified
+ .byte 9 # Abbrev [9] 0x73:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 100
+ .byte 6 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .long 73 # DW_AT_type Manually Modified
+ .byte 10 # Abbrev [10] 0x7e:0x16 DW_TAG_inlined_subroutine
+ .long 56 # DW_AT_abstract_origin
+ .byte 2 # DW_AT_low_pc
+ .long .Ltmp4-.Ltmp3 # DW_AT_high_pc
+ .byte 0 # DW_AT_call_file
+ .byte 6 # DW_AT_call_line
+ .byte 32 # DW_AT_call_column
+ .byte 3 # Abbrev [3] 0x8b:0x8 DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 124
+ .long 64 # DW_AT_abstract_origin Manually Modified
+ .byte 0 # End Of Children Mark
+ .byte 0 # End Of Children Mark
+ .byte 11 # Abbrev [11] 0x95:0x5 DW_TAG_pointer_type
+ .long 153 # DW_AT_type Manually Modified
+ .byte 11 # Abbrev [11] 0x9a:0x5 DW_TAG_pointer_type
+ .long 158 # DW_AT_type Manually Modified
+ .byte 6 # Abbrev [6] 0x9f:0x4 DW_TAG_base_type
+ .byte 10 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 48 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 20.0.0git" # string offset=0
+.Linfo_string1:
+ .asciz "main.cpp" # string offset=24
+.Linfo_string2:
+ .asciz "/abstractChain" # string offset=33
+.Linfo_string3:
+ .asciz "foo" # string offset=85
+.Linfo_string4:
+ .asciz "_Z3fooi" # string offset=89
+.Linfo_string5:
+ .asciz "int" # string offset=97
+.Linfo_string6:
+ .asciz "i" # string offset=101
+.Linfo_string7:
+ .asciz "main" # string offset=103
+.Linfo_string8:
+ .asciz "argc" # string offset=108
+.Linfo_string9:
+ .asciz "argv" # string offset=113
+.Linfo_string10:
+ .asciz "char" # string offset=118
+ .section .debug_str_offsets,"", at progbits
+ .long .Linfo_string0
+ .long .Linfo_string1
+ .long .Linfo_string2
+ .long .Linfo_string4
+ .long .Linfo_string3
+ .long .Linfo_string5
+ .long .Linfo_string6
+ .long .Linfo_string7
+ .long .Linfo_string8
+ .long .Linfo_string9
+ .long .Linfo_string10
+ .section .debug_addr,"", at progbits
+ .long .Ldebug_addr_end0-.Ldebug_addr_start0 # Length of contribution
+.Ldebug_addr_start0:
+ .short 5 # DWARF version number
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+ .quad .Lfunc_begin1
+ .quad .Ltmp3
+.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 5 # Header: bucket count
+ .long 5 # 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 0 # Bucket 2
+ .long 3 # Bucket 3
+ .long 4 # Bucket 4
+ .long 2090499946 # Hash in Bucket 1
+ .long -1257882370 # Hash in Bucket 1
+ .long 193495088 # Hash in Bucket 3
+ .long 193491849 # Hash in Bucket 4
+ .long 2090147939 # Hash in Bucket 4
+ .long .Linfo_string7 # String in Bucket 1: main
+ .long .Linfo_string4 # String in Bucket 1: _Z3fooi
+ .long .Linfo_string5 # String in Bucket 3: int
+ .long .Linfo_string3 # String in Bucket 4: foo
+ .long .Linfo_string10 # String in Bucket 4: char
+ .long .Lnames3-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 3
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 4
+ .long .Lnames4-.Lnames_entries0 # Offset in Bucket 4
+.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 29 # DW_TAG_inlined_subroutine
+ .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 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:
+.Lnames3:
+.L2:
+ .byte 1 # Abbreviation code
+ .long 78 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: main
+.Lnames1:
+.L0:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+.L3: # DW_IDX_parent
+ .byte 2 # Abbreviation code
+ .long 126 # DW_IDX_die_offset
+ .long .L2-.Lnames_entries0 # DW_IDX_parent
+ .byte 0 # End of list: _Z3fooi
+.Lnames2:
+.L1:
+ .byte 3 # Abbreviation code
+ .long 74 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+.Lnames0:
+ .byte 1 # Abbreviation code
+ .long 35 # DW_IDX_die_offset
+ .byte 2 # DW_IDX_parent
+ # Abbreviation code
+ .long 126 # DW_IDX_die_offset
+ .long .L2-.Lnames_entries0 # DW_IDX_parent
+ .byte 0 # End of list: foo
+.Lnames4:
+.L4:
+ .byte 3 # Abbreviation code
+ .long 159 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: char
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 20.0.0git"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/bolt/test/X86/dwarf5-debug-names-abstract-origin-specification.s b/bolt/test/X86/dwarf5-debug-names-abstract-origin-specification.s
new file mode 100644
index 00000000000000..2075640d6761cd
--- /dev/null
+++ b/bolt/test/X86/dwarf5-debug-names-abstract-origin-specification.s
@@ -0,0 +1,829 @@
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %s -o %tmain.o
+# RUN: %clang %cflags -gdwarf-5 %tmain.o -o %tmain.exe
+# RUN: llvm-bolt %tmain.exe -o %tmain.exe.bolt --update-debug-sections
+# RUN: llvm-dwarfdump --debug-names %tmain.exe.bolt > %tlog.txt
+# RUN: cat %tlog.txt | FileCheck -check-prefix=BOLT %s
+
+## This test checks that BOLT correctly generates .debug_names section when there is transative
+## DW_AT_name/DW_AT_linkage_name resolution.
+
+# BOLT: Abbreviations [
+# BOLT-NEXT: Abbreviation [[ABBREV1:0x[0-9a-f]*]] {
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# BOLT-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# BOLT-NEXT: }
+# BOLT-NEXT: Abbreviation [[ABBREV2:0x[0-9a-f]*]] {
+# BOLT-NEXT: Tag: DW_TAG_class_type
+# BOLT-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# BOLT-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# BOLT-NEXT: }
+# BOLT-NEXT: Abbreviation [[ABBREV3:0x[0-9a-f]*]] {
+# BOLT-NEXT: Tag: DW_TAG_inlined_subroutine
+# BOLT-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# BOLT-NEXT: DW_IDX_parent: DW_FORM_ref4
+# BOLT-NEXT: }
+# BOLT-NEXT: Abbreviation [[ABBREV4:0x[0-9a-f]*]] {
+# BOLT-NEXT: Tag: DW_TAG_base_type
+# BOLT-NEXT: DW_IDX_die_offset: DW_FORM_ref4
+# BOLT-NEXT: DW_IDX_parent: DW_FORM_flag_present
+# BOLT-NEXT: }
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 0 [
+# BOLT-NEXT: Name 1 {
+# BOLT-NEXT: Hash: 0xD72418AA
+# BOLT-NEXT: String: {{.+}} "_ZL3fooi"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV1]]
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: 0x000000ba
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 1 [
+# BOLT-NEXT: Name 2 {
+# BOLT-NEXT: Hash: 0x10614A06
+# BOLT-NEXT: String: {{.+}} "State"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV2]]
+# BOLT-NEXT: Tag: DW_TAG_class_type
+# BOLT-NEXT: DW_IDX_die_offset: 0x0000002b
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: Entry @ [[REF1:0x[0-9a-f]*]] {
+# BOLT-NEXT: Abbrev: [[ABBREV1]]
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: 0x00000089
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV3]]
+# BOLT-NEXT: Tag: DW_TAG_inlined_subroutine
+# BOLT-NEXT: DW_IDX_die_offset: 0x000000a3
+# BOLT-NEXT: DW_IDX_parent: Entry @ [[REF1]]
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 2 [
+# BOLT-NEXT: EMPTY
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 3 [
+# BOLT-NEXT: Name 3 {
+# BOLT-NEXT: Hash: 0xB888030
+# BOLT-NEXT: String: {{.+}} "int"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV4]]
+# BOLT-NEXT: Tag: DW_TAG_base_type
+# BOLT-NEXT: DW_IDX_die_offset: 0x00000085
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: Name 4 {
+# BOLT-NEXT: Hash: 0x7C9A7F6A
+# BOLT-NEXT: String: {{.+}} "main"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV1]]
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: 0x00000042
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 4 [
+# BOLT-NEXT: EMPTY
+# BOLT-NEXT: ]
+# BOLT-NEXT: Bucket 5 [
+# BOLT-NEXT: Name 5 {
+# BOLT-NEXT: Hash: 0xB887389
+# BOLT-NEXT: String: {{.+}} "foo"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV1]]
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: 0x000000ba
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: Name 6 {
+# BOLT-NEXT: Hash: 0x7C952063
+# BOLT-NEXT: String: {{.+}} "char"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV4]]
+# BOLT-NEXT: Tag: DW_TAG_base_type
+# BOLT-NEXT: DW_IDX_die_offset: 0x000000d9
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: }
+# BOLT-NEXT: Name 7 {
+# BOLT-NEXT: Hash: 0xFBBDC812
+# BOLT-NEXT: String: {{.+}} "_ZN5StateC2Ev"
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV1]]
+# BOLT-NEXT: Tag: DW_TAG_subprogram
+# BOLT-NEXT: DW_IDX_die_offset: 0x00000089
+# BOLT-NEXT: DW_IDX_parent: <parent not indexed>
+# BOLT-NEXT: }
+# BOLT-NEXT: Entry @ {{.+}} {
+# BOLT-NEXT: Abbrev: [[ABBREV3]]
+# BOLT-NEXT: Tag: DW_TAG_inlined_subroutine
+# BOLT-NEXT: DW_IDX_die_offset: 0x000000a3
+# BOLT-NEXT: DW_IDX_parent: Entry @ [[REF1]]
+
+## static int foo(int i) {
+## return i ++;
+## }
+## class State {
+## public:
+## State() {[[clang::always_inline]] foo(3);}
+## };
+##
+## int main(int argc, char* argv[]) {
+## State S;
+## return 0;
+## }
+
+## Test manually modified to redirect DW_TAG_inlined_subroutine to DW_TAG_subprogram with DW_AT_specification.
+
+ .text
+ .file "main.cpp"
+ .file 0 "abstractChainTwo" "main.cpp" md5 0x17ad726b6a1fd49ee59559a1302da539
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .loc 0 9 0 # main.cpp:9:0
+.Ltmp0:
+ .loc 0 10 9 prologue_end # main.cpp:10:9
+ callq _ZN5StateC2Ev
+ .loc 0 11 3 # main.cpp:11:3
+ .loc 0 11 3 epilogue_begin is_stmt 0 # main.cpp:11:3
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ # -- End function
+ .section .text._ZN5StateC2Ev,"axG", at progbits,_ZN5StateC2Ev,comdat
+ .weak _ZN5StateC2Ev # -- Begin function _ZN5StateC2Ev
+ .p2align 4, 0x90
+ .type _ZN5StateC2Ev, at function
+_ZN5StateC2Ev: # @_ZN5StateC2Ev
+.Lfunc_begin1:
+ .loc 0 6 0 is_stmt 1 # main.cpp:6:0
+ .cfi_startproc
+# %bb.0:
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ movq %rdi, -16(%rbp)
+ movl $3, -4(%rbp)
+.Ltmp2:
+ .loc 0 2 12 prologue_end # main.cpp:2:12
+ movl -4(%rbp), %eax
+ addl $1, %eax
+ movl %eax, -4(%rbp)
+.Ltmp3:
+ .loc 0 6 44 epilogue_begin # main.cpp:6:44
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp4:
+.Lfunc_end1:
+ .size _ZN5StateC2Ev, .Lfunc_end1-_ZN5StateC2Ev
+ .cfi_endproc
+ # -- End function
+ .text
+ .p2align 4, 0x90 # -- Begin function _ZL3fooi
+ .type _ZL3fooi, at function
+_ZL3fooi: # @_ZL3fooi
+.Lfunc_begin2:
+ .loc 0 1 0 # main.cpp:1:0
+ .cfi_startproc
+# %bb.0:
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ movl %edi, -4(%rbp)
+.Ltmp5:
+ .loc 0 2 12 prologue_end # main.cpp:2:12
+ movl -4(%rbp), %eax
+ movl %eax, %ecx
+ addl $1, %ecx
+ movl %ecx, -4(%rbp)
+ .loc 0 2 3 epilogue_begin is_stmt 0 # main.cpp:2:3
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp6:
+.Lfunc_end2:
+ .size _ZL3fooi, .Lfunc_end2-_ZL3fooi
+ .cfi_endproc
+ # -- End function
+ .section .debug_abbrev,"", at progbits
+ .byte 1 # Abbreviation Code
+ .byte 17 # DW_TAG_compile_unit
+ .byte 1 # DW_CHILDREN_yes
+ .byte 37 # DW_AT_producer
+ .byte 37 # DW_FORM_strx1
+ .byte 19 # DW_AT_language
+ .byte 5 # DW_FORM_data2
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 114 # DW_AT_str_offsets_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 16 # DW_AT_stmt_list
+ .byte 23 # DW_FORM_sec_offset
+ .byte 27 # DW_AT_comp_dir
+ .byte 37 # DW_FORM_strx1
+ .byte 17 # DW_AT_low_pc
+ .byte 1 # DW_FORM_addr
+ .byte 85 # DW_AT_ranges
+ .byte 35 # DW_FORM_rnglistx
+ .byte 115 # DW_AT_addr_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 116 # DW_AT_rnglists_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 2 # Abbreviation Code
+ .byte 2 # DW_TAG_class_type
+ .byte 1 # DW_CHILDREN_yes
+ .byte 54 # DW_AT_calling_convention
+ .byte 11 # DW_FORM_data1
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 11 # DW_AT_byte_size
+ .byte 11 # DW_FORM_data1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 60 # DW_AT_declaration
+ .byte 25 # DW_FORM_flag_present
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 50 # DW_AT_accessibility
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 4 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 52 # DW_AT_artificial
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 5 # Abbreviation Code
+ .byte 15 # DW_TAG_pointer_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 6 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 64 # DW_AT_frame_base
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 7 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 8 # Abbreviation Code
+ .byte 52 # DW_TAG_variable
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 9 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 110 # DW_AT_linkage_name
+ .byte 37 # DW_FORM_strx1
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 32 # DW_AT_inline
+ .byte 33 # DW_FORM_implicit_const
+ .byte 1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 10 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 11 # Abbreviation Code
+ .byte 36 # DW_TAG_base_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 62 # DW_AT_encoding
+ .byte 11 # DW_FORM_data1
+ .byte 11 # DW_AT_byte_size
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 12 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 64 # DW_AT_frame_base
+ .byte 24 # DW_FORM_exprloc
+ .byte 100 # DW_AT_object_pointer
+ .byte 19 # DW_FORM_ref4
+ .byte 110 # DW_AT_linkage_name
+ .byte 37 # DW_FORM_strx1
+ .byte 71 # DW_AT_specification
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 13 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 52 # DW_AT_artificial
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 14 # Abbreviation Code
+ .byte 29 # DW_TAG_inlined_subroutine
+ .byte 1 # DW_CHILDREN_yes
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 88 # DW_AT_call_file
+ .byte 11 # DW_FORM_data1
+ .byte 89 # DW_AT_call_line
+ .byte 11 # DW_FORM_data1
+ .byte 87 # DW_AT_call_column
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 15 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 16 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 64 # DW_AT_frame_base
+ .byte 24 # DW_FORM_exprloc
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .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:0xd7 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
+ .quad 0 # DW_AT_low_pc
+ .byte 0 # DW_AT_ranges
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .long .Lrnglists_table_base0 # DW_AT_rnglists_base
+ .byte 2 # Abbrev [2] 0x2b:0x12 DW_TAG_class_type
+ .byte 5 # DW_AT_calling_convention
+ .byte 3 # DW_AT_name
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .byte 3 # Abbrev [3] 0x31:0xb DW_TAG_subprogram
+ .byte 3 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 6 # DW_AT_decl_line
+ # DW_AT_declaration
+ # DW_AT_external
+ .byte 1 # DW_AT_accessibility
+ # DW_ACCESS_public
+ .byte 4 # Abbrev [4] 0x36:0x5 DW_TAG_formal_parameter
+ .long 61 # DW_AT_type
+ # DW_AT_artificial
+ .byte 0 # End Of Children Mark
+ .byte 0 # End Of Children Mark
+ .byte 5 # Abbrev [5] 0x3d:0x5 DW_TAG_pointer_type
+ .long 43 # DW_AT_type
+ .byte 6 # Abbrev [6] 0x42:0x31 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 8 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 9 # DW_AT_decl_line
+ .long 133 # DW_AT_type
+ # DW_AT_external
+ .byte 7 # Abbrev [7] 0x51:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 120
+ .byte 10 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 9 # DW_AT_decl_line
+ .long 133 # DW_AT_type
+ .byte 7 # Abbrev [7] 0x5c:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 112
+ .byte 11 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 9 # DW_AT_decl_line
+ .long 207 # DW_AT_type
+ .byte 8 # Abbrev [8] 0x67:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 111
+ .byte 13 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 10 # DW_AT_decl_line
+ .long 43 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 9 # Abbrev [9] 0x73:0x12 DW_TAG_subprogram
+ .byte 4 # DW_AT_linkage_name
+ .byte 5 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 133 # DW_AT_type
+ # DW_AT_inline
+ .byte 10 # Abbrev [10] 0x7c:0x8 DW_TAG_formal_parameter
+ .byte 7 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 133 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 11 # Abbrev [11] 0x85:0x4 DW_TAG_base_type
+ .byte 6 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 12 # Abbrev [12] 0x89:0x31 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
+ .long 154 # DW_AT_object_pointer
+ .byte 9 # DW_AT_linkage_name
+ .long 49 # DW_AT_specification
+ .byte 13 # Abbrev [13] 0x9a:0x9 DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 112
+ .byte 14 # DW_AT_name
+ .long 221 # DW_AT_type
+ # DW_AT_artificial
+ .byte 14 # Abbrev [14] 0xa3:0x16 DW_TAG_inlined_subroutine
+ .long 137 # DW_AT_abstract_origin Manually Modified
+ .byte 2 # DW_AT_low_pc
+ .long .Ltmp3-.Ltmp2 # DW_AT_high_pc
+ .byte 0 # DW_AT_call_file
+ .byte 6 # DW_AT_call_line
+ .byte 37 # DW_AT_call_column
+ .byte 15 # Abbrev [15] 0xb0:0x8 DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 124
+ .long 124 # DW_AT_abstract_origin
+ .byte 0 # End Of Children Mark
+ .byte 0 # End Of Children Mark
+ .byte 16 # Abbrev [16] 0xba:0x15 DW_TAG_subprogram
+ .byte 3 # DW_AT_low_pc
+ .long .Lfunc_end2-.Lfunc_begin2 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .long 115 # DW_AT_abstract_origin
+ .byte 15 # Abbrev [15] 0xc6:0x8 DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 124
+ .long 124 # DW_AT_abstract_origin
+ .byte 0 # End Of Children Mark
+ .byte 5 # Abbrev [5] 0xcf:0x5 DW_TAG_pointer_type
+ .long 212 # DW_AT_type
+ .byte 5 # Abbrev [5] 0xd4:0x5 DW_TAG_pointer_type
+ .long 217 # DW_AT_type
+ .byte 11 # Abbrev [11] 0xd9:0x4 DW_TAG_base_type
+ .byte 12 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 5 # Abbrev [5] 0xdd:0x5 DW_TAG_pointer_type
+ .long 43 # DW_AT_type
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_rnglists,"", at progbits
+ .long .Ldebug_list_header_end0-.Ldebug_list_header_start0 # Length
+.Ldebug_list_header_start0:
+ .short 5 # Version
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+ .long 1 # Offset entry count
+.Lrnglists_table_base0:
+ .long .Ldebug_ranges0-.Lrnglists_table_base0
+.Ldebug_ranges0:
+ .byte 1 # DW_RLE_base_addressx
+ .byte 0 # base address index
+ .byte 4 # DW_RLE_offset_pair
+ .uleb128 .Lfunc_begin0-.Lfunc_begin0 # starting offset
+ .uleb128 .Lfunc_end0-.Lfunc_begin0 # ending offset
+ .byte 4 # DW_RLE_offset_pair
+ .uleb128 .Lfunc_begin2-.Lfunc_begin0 # starting offset
+ .uleb128 .Lfunc_end2-.Lfunc_begin0 # ending offset
+ .byte 3 # DW_RLE_startx_length
+ .byte 1 # start index
+ .uleb128 .Lfunc_end1-.Lfunc_begin1 # length
+ .byte 0 # DW_RLE_end_of_list
+.Ldebug_list_header_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 64 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 20.0.0git" # string offset=0
+.Linfo_string1:
+ .asciz "main.cpp" # string offset=24
+.Linfo_string2:
+ .asciz "abstractChainTwo" # string offset=33
+.Linfo_string3:
+ .asciz "State" # string offset=88
+.Linfo_string4:
+ .asciz "main" # string offset=94
+.Linfo_string5:
+ .asciz "_ZL3fooi" # string offset=99
+.Linfo_string6:
+ .asciz "foo" # string offset=108
+.Linfo_string7:
+ .asciz "int" # string offset=112
+.Linfo_string8:
+ .asciz "i" # string offset=116
+.Linfo_string9:
+ .asciz "_ZN5StateC2Ev" # string offset=118
+.Linfo_string10:
+ .asciz "argc" # string offset=132
+.Linfo_string11:
+ .asciz "argv" # string offset=137
+.Linfo_string12:
+ .asciz "char" # string offset=142
+.Linfo_string13:
+ .asciz "S" # string offset=147
+.Linfo_string14:
+ .asciz "this" # string offset=149
+ .section .debug_str_offsets,"", at progbits
+ .long .Linfo_string0
+ .long .Linfo_string1
+ .long .Linfo_string2
+ .long .Linfo_string3
+ .long .Linfo_string5
+ .long .Linfo_string6
+ .long .Linfo_string7
+ .long .Linfo_string8
+ .long .Linfo_string4
+ .long .Linfo_string9
+ .long .Linfo_string10
+ .long .Linfo_string11
+ .long .Linfo_string12
+ .long .Linfo_string13
+ .long .Linfo_string14
+ .section .debug_addr,"", at progbits
+ .long .Ldebug_addr_end0-.Ldebug_addr_start0 # Length of contribution
+.Ldebug_addr_start0:
+ .short 5 # DWARF version number
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+ .quad .Lfunc_begin1
+ .quad .Ltmp2
+ .quad .Lfunc_begin2
+.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 7 # Header: bucket count
+ .long 7 # 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 2 # Bucket 1
+ .long 0 # Bucket 2
+ .long 3 # Bucket 3
+ .long 0 # Bucket 4
+ .long 5 # Bucket 5
+ .long 0 # Bucket 6
+ .long -685500246 # Hash in Bucket 0
+ .long 274811398 # Hash in Bucket 1
+ .long 193495088 # Hash in Bucket 3
+ .long 2090499946 # Hash in Bucket 3
+ .long 193491849 # Hash in Bucket 5
+ .long 2090147939 # Hash in Bucket 5
+ .long -71448558 # Hash in Bucket 5
+ .long .Linfo_string5 # String in Bucket 0: _ZL3fooi
+ .long .Linfo_string3 # String in Bucket 1: State
+ .long .Linfo_string7 # String in Bucket 3: int
+ .long .Linfo_string4 # String in Bucket 3: main
+ .long .Linfo_string6 # String in Bucket 5: foo
+ .long .Linfo_string12 # String in Bucket 5: char
+ .long .Linfo_string9 # String in Bucket 5: _ZN5StateC2Ev
+ .long .Lnames5-.Lnames_entries0 # Offset in Bucket 0
+ .long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
+ .long .Lnames2-.Lnames_entries0 # Offset in Bucket 3
+ .long .Lnames1-.Lnames_entries0 # Offset in Bucket 3
+ .long .Lnames4-.Lnames_entries0 # Offset in Bucket 5
+ .long .Lnames6-.Lnames_entries0 # Offset in Bucket 5
+ .long .Lnames3-.Lnames_entries0 # Offset in Bucket 5
+.Lnames_abbrev_start0:
+ .byte 1 # Abbrev code
+ .byte 29 # DW_TAG_inlined_subroutine
+ .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 2 # DW_TAG_class_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 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 0 # End of abbrev list
+.Lnames_abbrev_end0:
+.Lnames_entries0:
+.Lnames5:
+.L1:
+ .byte 1 # Abbreviation code
+ .long 163 # DW_IDX_die_offset
+ .long .L2-.Lnames_entries0 # DW_IDX_parent
+.L0:
+ .byte 2 # Abbreviation code
+ .long 186 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _ZL3fooi
+.Lnames0:
+.L5:
+ .byte 3 # Abbreviation code
+ .long 43 # DW_IDX_die_offset
+.L2: # DW_IDX_parent
+ .byte 2 # Abbreviation code
+ .long 137 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: State
+.Lnames2:
+.L4:
+ .byte 4 # Abbreviation code
+ .long 133 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: int
+.Lnames1:
+.L6:
+ .byte 2 # Abbreviation code
+ .long 66 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: main
+.Lnames4:
+ .byte 1 # Abbreviation code
+ .long 163 # DW_IDX_die_offset
+ .long .L2-.Lnames_entries0 # DW_IDX_parent
+ .byte 2 # Abbreviation code
+ .long 186 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: foo
+.Lnames6:
+.L3:
+ .byte 4 # Abbreviation code
+ .long 217 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: char
+.Lnames3:
+ .byte 2 # Abbreviation code
+ .long 137 # DW_IDX_die_offset
+ .byte 0 # DW_IDX_parent
+ # End of list: _ZN5StateC2Ev
+ .p2align 2, 0x0
+.Lnames_end0:
+ .ident "clang version 20.0.0git"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
>From 556b083b9ce576540e5e289a2e2cdfc3676fd778 Mon Sep 17 00:00:00 2001
From: Alexander Yermolovich <ayermolo at meta.com>
Date: Wed, 11 Dec 2024 10:50:43 -0800
Subject: [PATCH 2/2] various comments
---
bolt/lib/Core/DebugNames.cpp | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/bolt/lib/Core/DebugNames.cpp b/bolt/lib/Core/DebugNames.cpp
index b9ea1765e39b6f..f33ca83023a0b0 100644
--- a/bolt/lib/Core/DebugNames.cpp
+++ b/bolt/lib/Core/DebugNames.cpp
@@ -270,7 +270,7 @@ std::optional<std::string> DWARF5AcceleratorTable::getName(
if (!NameToUse.empty())
NameIndexOffset = MainBinaryStrWriter.addString(Name);
It.StrOffset = NameIndexOffset;
- // This the same hash function used in DWARF5AccelTableData.
+ // This is the same hash function used in DWARF5AccelTableData.
It.HashValue = caseFoldingDjbHash(Name);
}
return Name;
@@ -301,9 +301,8 @@ std::optional<BOLTDWARF5AccelTableData *> DWARF5AcceleratorTable::addEntry(
}
std::optional<uint64_t> ParentOffset =
(Parent ? std::optional<uint64_t>(getEntryID(**Parent)) : std::nullopt);
- // This will be populated later in writeEntry.
- // This way only parent entries get tracked.
- // Keeping memory footprint down.
+ // This will be only populated in writeEntry, in order to keep only the parent
+ // entries, and keep the footprint down.
if (ParentOffset)
EntryRelativeOffsets.insert({*ParentOffset, 0});
bool IsParentRoot = false;
@@ -387,7 +386,7 @@ DWARF5AcceleratorTable::addAccelTableEntry(
if (!canProcess(Unit, Die, NameToUse, false))
return std::nullopt;
- // Addes a Unit to either CU, LocalTU or ForeignTU list the first time we
+ // Adds a Unit to either CU, LocalTU or ForeignTU list the first time we
// encounter it.
// Invoking it here so that we don't add Units that don't have any entries.
if (&Unit != CurrentUnit) {
@@ -414,10 +413,10 @@ DWARF5AcceleratorTable::addAccelTableEntry(
// The DIE doesn't have DW_AT_name or DW_AT_linkage_name, so we need to see if
// we can follow other attributes to find them. For the purposes of
- // determining whether a debugging information entry has a particular
- // attribute (such as DW_AT_name), if debugging information entry A has a
+ // determining whether a debug information entry has a particular
+ // attribute (such as DW_AT_name), if debug information entry A has a
// DW_AT_specification or DW_AT_abstract_origin attribute pointing to another
- // debugging information entry B, any attributes of B are considered to be
+ // debug information entry B, any attributes of B are considered to be
// part of A.
if (std::optional<BOLTDWARF5AccelTableData *> Entry = processReferencedDie(
Unit, Die, DWOID, Parent, NameToUse, NumberParentsInChain,
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