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[llvm][DebugInfo] Add support for emitting DW_AT_language_version #163147

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Merged
merged 3 commits into from
Oct 17, 2025
Merged

[llvm][DebugInfo] Add support for emitting DW_AT_language_version #163147

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c3a693d
[llvm][DebugInfo] DW_AT_language_version
Michael137 Oct 7, 2025
5d80efc
fixup! clang-format
Michael137 Oct 13, 2025
fc331f7
Merge branch 'main' into llvm/dwarf-language-attrs-2-part-10
Michael137 Oct 17, 2025
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9 changes: 7 additions & 2 deletions llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1039,12 +1039,17 @@ void DwarfDebug::finishUnitAttributes(const DICompileUnit *DIUnit,
} else
NewCU.addString(Die, dwarf::DW_AT_producer, Producer);

if (auto Lang = DIUnit->getSourceLanguage(); Lang.hasVersionedName())
if (auto Lang = DIUnit->getSourceLanguage(); Lang.hasVersionedName()) {
NewCU.addUInt(Die, dwarf::DW_AT_language_name, dwarf::DW_FORM_data2,
Lang.getName());
else

if (uint32_t LangVersion = Lang.getVersion(); LangVersion != 0)
NewCU.addUInt(Die, dwarf::DW_AT_language_version, /*Form=*/std::nullopt,
LangVersion);
} else {
NewCU.addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
Lang.getName());
}

NewCU.addString(Die, dwarf::DW_AT_name, FN);
StringRef SysRoot = DIUnit->getSysRoot();
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10 changes: 8 additions & 2 deletions llvm/test/DebugInfo/Generic/compileunit-source-language-name.ll
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@@ -1,6 +1,10 @@
; RUN: %llc_dwarf -filetype=obj -O0 < %s | llvm-dwarfdump -debug-info - | FileCheck %s --implicit-check-not "DW_AT_language"

; CHECK: DW_AT_language_name (DW_LNAME_ObjC_plus_plus)
; CHECK: DW_AT_language_name (DW_LNAME_ObjC_plus_plus)
; CHECK: DW_AT_language_name (DW_LNAME_C_plus_plus)
; CHECK: DW_AT_language_version (201100)
; CHECK: DW_AT_language_name (DW_LNAME_Rust)
; CHECK-NOT: DW_AT_language_version

@x = global i32 0, align 4, !dbg !0

Expand All @@ -9,7 +13,7 @@ define void @_Z4funcv() !dbg !8 {
ret void, !dbg !11
}

!llvm.dbg.cu = !{!2}
!llvm.dbg.cu = !{!2, !12, !13}
!llvm.module.flags = !{!6, !7}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
Expand All @@ -24,3 +28,5 @@ define void @_Z4funcv() !dbg !8 {
!9 = !DISubroutineType(types: !10)
!10 = !{null}
!11 = !DILocation(line: 2, column: 14, scope: !8)
!12 = distinct !DICompileUnit(sourceLanguageName: DW_LNAME_C_plus_plus, sourceLanguageVersion: 201100, file: !3, producer: "handwritten", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: Apple, sysroot: "/")
!13 = distinct !DICompileUnit(sourceLanguageName: DW_LNAME_Rust, sourceLanguageVersion: 0, file: !3, producer: "handwritten", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: Apple, sysroot: "/")
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