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[llvm-debuginfo-analyzer] Add support for DWARF DW_AT_byte_size #139110

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May 22, 2025
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[llvm-debuginfo-analyzer] Add support for DWARF DW_AT_byte_size #139110

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629d4d3
[llvm-debuginfo-analyzer] Add support for DWARF `DW_AT_byte_size`
jalopezg-git May 16, 2025
7c6d1a4
[llvm-debuginfo-analyzer] Update cmdline.test
jalopezg-git May 22, 2025
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5 changes: 4 additions & 1 deletion llvm/docs/CommandGuide/llvm-debuginfo-analyzer.rst
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Expand Up @@ -161,7 +161,8 @@ toolchain name, binary file format, etc.
transformations, in order to display built-in types (int, bool, etc.);
parameters and arguments used during template instantiation; parent
name hierarchy; array dimensions information; compiler generated
elements and the underlying types associated with the types aliases.
elements; type sizes and the underlying types associated with the types
aliases.

.. code-block:: text

Expand All @@ -171,6 +172,7 @@ toolchain name, binary file format, etc.
=encoded: Template arguments encoded in the template name.
=qualified: The element type include parents in its name.
=reference: Element declaration and definition references.
=size: Sizes for compound and base types.
=subrange: Subrange encoding information for arrays.
=typename: Template parameters.
=underlying: Underlying type for type definitions.
Expand Down Expand Up @@ -258,6 +260,7 @@ toolchain name, binary file format, etc.
=qualified
=qualifier
=register
=size
=subrange
=system
=typename
Expand Down
8 changes: 8 additions & 0 deletions llvm/include/llvm/DebugInfo/LogicalView/Core/LVElement.h
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Expand Up @@ -16,6 +16,7 @@

#include "llvm/DebugInfo/LogicalView/Core/LVObject.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/MathExtras.h"
#include <map>
#include <set>
#include <vector>
Expand Down Expand Up @@ -65,6 +66,10 @@ using LVElementKindSet = std::set<LVElementKind>;
using LVElementDispatch = std::map<LVElementKind, LVElementGetFunction>;
using LVElementRequest = std::vector<LVElementGetFunction>;

// Assume 8-bit bytes; this is consistent, e.g. with
// lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp.
constexpr unsigned int DWARF_CHAR_BIT = 8u;

class LVElement : public LVObject {
enum class Property {
IsLine, // A logical line.
Expand Down Expand Up @@ -240,6 +245,9 @@ class LVElement : public LVObject {
virtual bool isBase() const { return false; }
virtual bool isTemplateParam() const { return false; }

uint32_t getStorageSizeInBytes() const {
return llvm::divideCeil(getBitSize(), DWARF_CHAR_BIT);
}
virtual uint32_t getBitSize() const { return 0; }
virtual void setBitSize(uint32_t Size) {}

Expand Down
2 changes: 2 additions & 0 deletions llvm/include/llvm/DebugInfo/LogicalView/Core/LVOptions.h
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Expand Up @@ -119,6 +119,7 @@ enum class LVAttributeKind {
Range, // --attribute=range
Reference, // --attribute=reference
Register, // --attribute=register
Size, // --attribute=size
Standard, // --attribute=standard
Subrange, // --attribute=subrange
System, // --attribute=system
Expand Down Expand Up @@ -349,6 +350,7 @@ class LVOptions {
ATTRIBUTE_OPTION(Range);
ATTRIBUTE_OPTION(Reference);
ATTRIBUTE_OPTION(Register);
ATTRIBUTE_OPTION(Size);
ATTRIBUTE_OPTION(Standard);
ATTRIBUTE_OPTION(Subrange);
ATTRIBUTE_OPTION(System);
Expand Down
6 changes: 6 additions & 0 deletions llvm/include/llvm/DebugInfo/LogicalView/Core/LVScope.h
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Expand Up @@ -94,6 +94,9 @@ class LVScope : public LVElement {
LVProperties<Property> Properties;
static LVScopeDispatch Dispatch;

// Size in bits if this scope represents also a compound type.
uint32_t BitSize = 0;

// Coverage factor in units (bytes).
unsigned CoverageFactor = 0;

Expand Down Expand Up @@ -271,6 +274,9 @@ class LVScope : public LVElement {
bool removeElement(LVElement *Element) override;
void updateLevel(LVScope *Parent, bool Moved) override;

uint32_t getBitSize() const override { return BitSize; }
void setBitSize(uint32_t Size) override { BitSize = Size; }

void resolve() override;
void resolveName() override;
void resolveReferences() override;
Expand Down
7 changes: 7 additions & 0 deletions llvm/include/llvm/DebugInfo/LogicalView/Core/LVType.h
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Expand Up @@ -56,6 +56,9 @@ class LVType : public LVElement {
LVProperties<Property> Properties;
static LVTypeDispatch Dispatch;

// Size in bits of a symbol of this type.
uint32_t BitSize = 0;

// Find the current type in the given 'Targets'.
LVType *findIn(const LVTypes *Targets) const;

Expand Down Expand Up @@ -109,6 +112,10 @@ class LVType : public LVElement {
virtual LVElement *getUnderlyingType() { return nullptr; }
virtual void setUnderlyingType(LVElement *Element) {}

// Return the size in bits of an entity of this type.
uint32_t getBitSize() const override { return BitSize; }
void setBitSize(uint32_t Size) override { BitSize = Size; }

void resolveName() override;
void resolveReferences() override;

Expand Down
9 changes: 6 additions & 3 deletions llvm/lib/DebugInfo/LogicalView/Core/LVOptions.cpp
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Expand Up @@ -67,6 +67,7 @@ void LVOptions::resolveDependencies() {
setAttributeQualified();
setAttributeQualifier();
setAttributeRegister();
setAttributeSize();
setAttributeSubrange();
setAttributeSystem();
setAttributeTypename();
Expand Down Expand Up @@ -208,7 +209,7 @@ void LVOptions::resolveDependencies() {
// 1) Sort the CUs, to get a fast compare.
// 2) Encode template instantiations, so the names include template
// parameter information.
// 3) Include qualified types.
// 3) Include qualified types and their sizes.
// 4) Include any inserted abstract references.
// 5) For added/missing elements add the '+' or '-' tags.
if (getCompareExecute()) {
Expand All @@ -221,6 +222,7 @@ void LVOptions::resolveDependencies() {
setAttributeInserted();
setAttributeMissing();
setAttributeQualified();
setAttributeSize();
}

// Enable formatting for printing (indentation, print children).
Expand Down Expand Up @@ -312,9 +314,10 @@ void LVOptions::print(raw_ostream &OS) const {
<< "Range: " << getAttributeRange() << ", "
<< "Reference: " << getAttributeReference() << "\n"
<< "Register: " << getAttributeRegister() << ", "
<< "Size: " << getAttributeSize() << ", "
<< "Standard: " << getAttributeStandard() << ", "
<< "Subrange: " << getAttributeSubrange() << ", "
<< "System: " << getAttributeSystem() << "\n"
<< "Subrange: " << getAttributeSubrange() << "\n"
<< "System: " << getAttributeSystem() << ", "
<< "Typename: " << getAttributeTypename() << ", "
<< "Underlying: " << getAttributeUnderlying() << ", "
<< "Zero: " << getAttributeZero() << "\n";
Expand Down
6 changes: 5 additions & 1 deletion llvm/lib/DebugInfo/LogicalView/Core/LVScope.cpp
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Expand Up @@ -1018,9 +1018,13 @@ void LVScope::printExtra(raw_ostream &OS, bool Full) const {
// Do not print any type or name for a lexical block.
if (!getIsBlock()) {
OS << " " << formattedName(getName());
if (!getIsAggregate())
if (!getIsAggregate()) {
OS << " -> " << typeOffsetAsString()
<< formattedNames(getTypeQualifiedName(), typeAsString());
}
if (options().getAttributeSize())
if (uint32_t Size = getStorageSizeInBytes())
OS << " [Size = " << Size << "]";
}
OS << "\n";

Expand Down
6 changes: 5 additions & 1 deletion llvm/lib/DebugInfo/LogicalView/Core/LVType.cpp
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Expand Up @@ -292,7 +292,11 @@ void LVType::print(raw_ostream &OS, bool Full) const {
}

void LVType::printExtra(raw_ostream &OS, bool Full) const {
OS << formattedKind(kind()) << " " << formattedName(getName()) << "\n";
OS << formattedKind(kind()) << " " << formattedName(getName());
if (options().getAttributeSize())
if (uint32_t Size = getStorageSizeInBytes())
OS << " [Size = " << Size << "]";
OS << "\n";
}

//===----------------------------------------------------------------------===//
Expand Down
3 changes: 3 additions & 0 deletions llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewVisitor.cpp
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Expand Up @@ -1987,6 +1987,7 @@ Error LVLogicalVisitor::visitKnownRecord(CVType &Record, ClassRecord &Class,
Scope->setName(Class.getName());
if (Class.hasUniqueName())
Scope->setLinkageName(Class.getUniqueName());
Scope->setBitSize(Class.getSize() * DWARF_CHAR_BIT);

if (Class.isNested()) {
Scope->setIsNested();
Expand Down Expand Up @@ -2455,6 +2456,7 @@ Error LVLogicalVisitor::visitKnownRecord(CVType &Record, UnionRecord &Union,
Scope->setName(Union.getName());
if (Union.hasUniqueName())
Scope->setLinkageName(Union.getUniqueName());
Scope->setBitSize(Union.getSize() * DWARF_CHAR_BIT);

if (Union.isNested()) {
Scope->setIsNested();
Expand Down Expand Up @@ -3208,6 +3210,7 @@ LVType *LVLogicalVisitor::createBaseType(TypeIndex TI, StringRef TypeName) {

if (createElement(TIR, SimpleKind)) {
CurrentType->setName(TypeName);
CurrentType->setBitSize(getSizeInBytesForTypeIndex(TIR) * DWARF_CHAR_BIT);
Reader->getCompileUnit()->addElement(CurrentType);
}
return CurrentType;
Expand Down
3 changes: 3 additions & 0 deletions llvm/lib/DebugInfo/LogicalView/Readers/LVDWARFReader.cpp
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Expand Up @@ -310,6 +310,9 @@ void LVDWARFReader::processOneAttribute(const DWARFDie &Die,
case dwarf::DW_AT_bit_size:
CurrentElement->setBitSize(GetAsUnsignedConstant());
break;
case dwarf::DW_AT_byte_size:
CurrentElement->setBitSize(GetAsUnsignedConstant() * DWARF_CHAR_BIT);
break;
case dwarf::DW_AT_call_file:
CurrentElement->setCallFilenameIndex(IncrementFileIndex
? GetAsUnsignedConstant() + 1
Expand Down
20 changes: 10 additions & 10 deletions llvm/test/tools/llvm-debuginfo-analyzer/COFF/04-coff-missing-nested-enumerators.test
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Expand Up @@ -25,7 +25,7 @@
; references to the enumerators 'RED' and 'BLUE'. The CodeView generated
; by GCC and MSVC, does include such references.

; RUN: llvm-debuginfo-analyzer --attribute=level,format,producer \
; RUN: llvm-debuginfo-analyzer --attribute=level,format,producer,size \
; RUN: --output-sort=name \
; RUN: --print=symbols,types \
; RUN: %p/Inputs/pr-46466-codeview-clang.o \
Expand All @@ -38,9 +38,9 @@
; ONE-NEXT: [001] {CompileUnit} 'pr-46466.cpp'
; ONE-NEXT: [002] {Producer} 'clang version 15.0.0 {{.*}}'
; ONE-NEXT: [002] {Variable} extern 'S' -> 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct' [Size = 1]
; ONE-NEXT: [003] {Member} public 'U' -> 'Union'
; ONE-NEXT: [003] 2 {Union} 'Union'
; ONE-NEXT: [003] 2 {Union} 'Union' [Size = 1]
; ONE-NEXT: [004] 3 {Enumeration} 'NestedEnum' -> 'int'
; ONE-NEXT: [005] {Enumerator} 'BLUE' = '0x1'
; ONE-NEXT: [005] {Enumerator} 'RED' = '0x0'
Expand All @@ -51,9 +51,9 @@
; ONE-NEXT: [001] {CompileUnit} 'pr-46466.cpp'
; ONE-NEXT: [002] {Producer} 'Microsoft (R) Optimizing Compiler'
; ONE-NEXT: [002] {Variable} extern 'S' -> 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct' [Size = 1]
; ONE-NEXT: [003] {Member} public 'U' -> 'Union'
; ONE-NEXT: [003] 2 {Union} 'Union'
; ONE-NEXT: [003] 2 {Union} 'Union' [Size = 1]
; ONE-NEXT: [004] 3 {Enumeration} 'NestedEnum' -> 'int'
; ONE-NEXT: [005] {Enumerator} 'BLUE' = '0x1'
; ONE-NEXT: [005] {Enumerator} 'RED' = '0x0'
Expand All @@ -62,7 +62,7 @@
; showing just the logical types that are 'Enumerator' and its
; parents. The logical view is sorted by the types name.

; RUN: llvm-debuginfo-analyzer --attribute=level,format \
; RUN: llvm-debuginfo-analyzer --attribute=level,format,size \
; RUN: --output-sort=name \
; RUN: --select-types=Enumerator \
; RUN: --report=parents \
Expand All @@ -74,8 +74,8 @@
; TWO-NEXT: [000] {File} 'pr-46466-codeview-clang.o' -> COFF-x86-64
; TWO-EMPTY:
; TWO-NEXT: [001] {CompileUnit} 'pr-46466.cpp'
; TWO-NEXT: [002] 1 {Struct} 'Struct'
; TWO-NEXT: [003] 2 {Union} 'Union'
; TWO-NEXT: [002] 1 {Struct} 'Struct' [Size = 1]
; TWO-NEXT: [003] 2 {Union} 'Union' [Size = 1]
; TWO-NEXT: [004] 3 {Enumeration} 'NestedEnum' -> 'int'
; TWO-NEXT: [005] {Enumerator} 'BLUE' = '0x1'
; TWO-NEXT: [005] {Enumerator} 'RED' = '0x0'
Expand All @@ -84,8 +84,8 @@
; TWO-NEXT: [000] {File} 'pr-46466-codeview-msvc.o' -> COFF-x86-64
; TWO-EMPTY:
; TWO-NEXT: [001] {CompileUnit} 'pr-46466.cpp'
; TWO-NEXT: [002] 1 {Struct} 'Struct'
; TWO-NEXT: [003] 2 {Union} 'Union'
; TWO-NEXT: [002] 1 {Struct} 'Struct' [Size = 1]
; TWO-NEXT: [003] 2 {Union} 'Union' [Size = 1]
; TWO-NEXT: [004] 3 {Enumeration} 'NestedEnum' -> 'int'
; TWO-NEXT: [005] {Enumerator} 'BLUE' = '0x1'
; TWO-NEXT: [005] {Enumerator} 'RED' = '0x0'
Expand Down
6 changes: 3 additions & 3 deletions llvm/test/tools/llvm-debuginfo-analyzer/COFF/06-coff-full-logical-view.test
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Expand Up @@ -34,7 +34,7 @@
; ONE-NEXT: {File} 'test.cpp'
; ONE-NEXT: {Public} 'foo' [0x0000000000:0x0000000046]
; ONE-NEXT: [0x0000000000][002] {TypeAlias} 'INTPTR' -> [0x0000001001]'* const int'
; ONE-NEXT: [0x0000000030][002] {BaseType} 'bool'
; ONE-NEXT: [0x0000000030][002] {BaseType} 'bool' [Size = 1]
; ONE-NEXT: [0x0000000000][002] {Function} extern not_inlined 'foo' -> [0x0000000074]'int'
; ONE-NEXT: [0x0000000000][003] {Range} Lines 2:9 [0x0000000000:0x0000000046]
; ONE-NEXT: [0x0000000000][003] {Linkage} 0x1 '?foo@@YAHPEBHI_N@Z'
Expand Down Expand Up @@ -80,8 +80,8 @@
; ONE-NEXT: [0x000000003e][003] {Code} 'movl 0x1c(%rsp), %eax'
; ONE-NEXT: [0x0000000042][003] {Code} 'addq $0x20, %rsp'
; ONE-NEXT: [0x0000000046][003] {Code} 'retq'
; ONE-NEXT: [0x0000000074][002] {BaseType} 'int'
; ONE-NEXT: [0x0000000075][002] {BaseType} 'unsigned'
; ONE-NEXT: [0x0000000074][002] {BaseType} 'int' [Size = 4]
; ONE-NEXT: [0x0000000075][002] {BaseType} 'unsigned' [Size = 4]
; ONE-EMPTY:
; ONE-NEXT: -----------------------------
; ONE-NEXT: Element Total Printed
Expand Down
14 changes: 7 additions & 7 deletions llvm/test/tools/llvm-debuginfo-analyzer/DWARF/04-dwarf-missing-nested-enumerators.test
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Expand Up @@ -25,7 +25,7 @@
; references to the enumerators 'RED' and 'BLUE'. The DWARF generated
; by GCC, does include such references.

; RUN: llvm-debuginfo-analyzer --attribute=level,format,producer \
; RUN: llvm-debuginfo-analyzer --attribute=level,format,producer,size \
; RUN: --output-sort=name \
; RUN: --print=symbols,types \
; RUN: %p/Inputs/pr-46466-dwarf-clang.o \
Expand All @@ -38,7 +38,7 @@
; ONE-NEXT: [001] {CompileUnit} 'pr-46466.cpp'
; ONE-NEXT: [002] {Producer} 'clang version 15.0.0 {{.*}}'
; ONE-NEXT: [002] 8 {Variable} extern 'S' -> 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct' [Size = 1]
; ONE-NEXT: [003] 5 {Member} public 'U' -> 'Union'
; ONE-EMPTY:
; ONE-NEXT: Logical View:
Expand All @@ -47,9 +47,9 @@
; ONE-NEXT: [001] {CompileUnit} 'pr-46466.cpp'
; ONE-NEXT: [002] {Producer} 'GNU C++14 10.3.0 {{.*}}'
; ONE-NEXT: [002] 8 {Variable} extern 'S' -> 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct'
; ONE-NEXT: [002] 1 {Struct} 'Struct' [Size = 1]
; ONE-NEXT: [003] 5 {Member} public 'U' -> 'Union'
; ONE-NEXT: [003] 2 {Union} 'Union'
; ONE-NEXT: [003] 2 {Union} 'Union' [Size = 1]
; ONE-NEXT: [004] 3 {Enumeration} 'NestedEnum' -> 'unsigned int'
; ONE-NEXT: [005] {Enumerator} 'BLUE' = '0x1'
; ONE-NEXT: [005] {Enumerator} 'RED' = '0x0'
Expand All @@ -58,7 +58,7 @@
; showing just the logical types that are 'Enumerator' and its
; parents. The logical view is sorted by the types name.

; RUN: llvm-debuginfo-analyzer --attribute=level,format \
; RUN: llvm-debuginfo-analyzer --attribute=level,format,size \
; RUN: --output-sort=name \
; RUN: --select-types=Enumerator \
; RUN: --report=parents \
Expand All @@ -75,8 +75,8 @@
; TWO-NEXT: [000] {File} 'pr-46466-dwarf-gcc.o' -> elf64-x86-64
; TWO-EMPTY:
; TWO-NEXT: [001] {CompileUnit} 'pr-46466.cpp'
; TWO-NEXT: [002] 1 {Struct} 'Struct'
; TWO-NEXT: [003] 2 {Union} 'Union'
; TWO-NEXT: [002] 1 {Struct} 'Struct' [Size = 1]
; TWO-NEXT: [003] 2 {Union} 'Union' [Size = 1]
; TWO-NEXT: [004] 3 {Enumeration} 'NestedEnum' -> 'unsigned int'
; TWO-NEXT: [005] {Enumerator} 'BLUE' = '0x1'
; TWO-NEXT: [005] {Enumerator} 'RED' = '0x0'
Expand Down
6 changes: 3 additions & 3 deletions llvm/test/tools/llvm-debuginfo-analyzer/DWARF/06-dwarf-full-logical-view.test
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Expand Up @@ -32,9 +32,9 @@
; ONE-NEXT: {File} 'test.cpp'
; ONE-NEXT: {Public} 'foo' [0x0000000000:0x000000003a]
; ONE-NEXT: [0x000000000b][002] {Range} Lines 2:9 [0x0000000000:0x000000003a]
; ONE-NEXT: [0x00000000bc][002] {BaseType} 'bool'
; ONE-NEXT: [0x0000000099][002] {BaseType} 'int'
; ONE-NEXT: [0x00000000b5][002] {BaseType} 'unsigned int'
; ONE-NEXT: [0x00000000bc][002] {BaseType} 'bool' [Size = 1]
; ONE-NEXT: [0x0000000099][002] {BaseType} 'int' [Size = 4]
; ONE-NEXT: [0x00000000b5][002] {BaseType} 'unsigned int' [Size = 4]
; ONE-EMPTY:
; ONE-NEXT: [0x00000000a0][002] {Source} '/data/projects/tests/input/general/test.cpp'
; ONE-NEXT: [0x00000000a0][002] 1 {TypeAlias} 'INTPTR' -> [0x00000000ab]'* const int'
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/tools/llvm-debuginfo-analyzer/DWARF/dw-at-specification.test
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Expand Up @@ -13,7 +13,7 @@
; an assert in the LVDWARFReader:
; $ clang++ -g -c dw-at-specification.cpp -o dw-at-specification.o

; RUN: llvm-debuginfo-analyzer --attribute=level,format,producer \
; RUN: llvm-debuginfo-analyzer --attribute=level,format,producer,size \
; RUN: --output-sort=name \
; RUN: --print=symbols \
; RUN: %p/Inputs/dw-at-specification.o 2>&1 | \
Expand All @@ -25,5 +25,5 @@
; CHECK: [001] {CompileUnit} 'a.cpp'
; CHECK: [002] {Producer} 'clang version 11.0.0 ({{.*}})'
; CHECK: [002] {Variable} 'Arr' -> 'const int [3]'
; CHECK: [002] 1 {Struct} 'S'
; CHECK: [002] 1 {Struct} 'S' [Size = 1]
; CHECK: [003] 2 {Member} extern public 'Arr' -> 'const int [1]'
2 changes: 2 additions & 0 deletions llvm/test/tools/llvm-debuginfo-analyzer/cmdline.test
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Expand Up @@ -64,6 +64,7 @@ HELP-ALL: =qualifier - Line qualifiers (Newstatement, BasicB
HELP-ALL: =range - Debug location ranges.
HELP-ALL: =reference - Element declaration and definition references.
HELP-ALL: =register - Processor register names.
HELP-ALL: =size - Type sizes.
HELP-ALL: =standard - Basic attributes alias.
HELP-ALL: =subrange - Subrange encoding information for arrays.
HELP-ALL: =system - Display PDB's MS system elements.
Expand Down Expand Up @@ -169,6 +170,7 @@ HELP-ALL: =FunctionType - Function type.
HELP-ALL: =InlinedFunction - Inlined function.
HELP-ALL: =Label - Label.
HELP-ALL: =LexicalBlock - Lexical block.
HELP-ALL: =Module - Module.
HELP-ALL: =Namespace - Namespace.
HELP-ALL: =Root - Root.
HELP-ALL: =Structure - Structure.
Expand Down
1 change: 1 addition & 0 deletions llvm/tools/llvm-debuginfo-analyzer/Options.cpp
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Expand Up @@ -114,6 +114,7 @@ cl::list<LVAttributeKind> cmdline::AttributeOptions(
"Element declaration and definition references."),
clEnumValN(LVAttributeKind::Register, "register",
"Processor register names."),
clEnumValN(LVAttributeKind::Size, "size", "Type sizes."),
clEnumValN(LVAttributeKind::Standard, "standard",
"Basic attributes alias."),
clEnumValN(LVAttributeKind::Subrange, "subrange",
Expand Down
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