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[llvm][ELF] Separate out .dwo bytes written in stats #126165

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Feb 7, 2025
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[llvm][ELF] Separate out .dwo bytes written in stats #126165

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[llvm][ELF] Separate out .dwo bytes written in stats
aeubanks Feb 7, 2025
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aeubanks Feb 7, 2025
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7 changes: 5 additions & 2 deletions llvm/lib/MC/ELFObjectWriter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -71,9 +71,10 @@ STATISTIC(StrtabBytes, "Total size of SHT_STRTAB sections");
STATISTIC(SymtabBytes, "Total size of SHT_SYMTAB sections");
STATISTIC(RelocationBytes, "Total size of relocation sections");
STATISTIC(DynsymBytes, "Total size of SHT_DYNSYM sections");
STATISTIC(DebugBytes, "Total size of debug info sections");
STATISTIC(DebugBytes, "Total size of debug info sections (not including those written to .dwo)");
STATISTIC(UnwindBytes, "Total size of unwind sections");
STATISTIC(OtherBytes, "Total size of uncategorized sections");
STATISTIC(DwoBytes, "Total size of sections written to .dwo file");

} // namespace stats

Expand Down Expand Up @@ -969,7 +970,9 @@ void ELFWriter::writeSectionHeaders(const MCAssembler &Asm) {
return Section->getFlags() & Flag;
};

if (Section->getName().starts_with(".debug")) {
if (Mode == DwoOnly) {
stats::DwoBytes += Size;
} else if (Section->getName().starts_with(".debug")) {
stats::DebugBytes += Size;
} else if (Section->getName().starts_with(".eh_frame")) {
stats::UnwindBytes += Size;
Expand Down
30 changes: 30 additions & 0 deletions llvm/test/CodeGen/X86/dwo-stats.ll
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@@ -0,0 +1,30 @@
; REQUIRES: asserts
; RUN: llc %s -mtriple=x86_64-linux --split-dwarf-file=%t.dwo --split-dwarf-output=%t.dwo --filetype=obj -o /dev/null -stats 2>&1 | FileCheck %s --check-prefixes=SPLIT,CHECK
; RUN: llc %s -mtriple=x86_64-linux --filetype=obj -o /dev/null -stats 2>&1 | FileCheck %s --check-prefixes=NOTSPLIT,CHECK

; NOTSPLIT-NOT: {{[0-9]+}} elf-object-writer - Total size of sections written to .dwo file
; CHECK-DAG: {{[0-9]+}} elf-object-writer - Total size of debug info sections
; SPLIT-DAG: {{[0-9]+}} elf-object-writer - Total size of sections written to .dwo file
; NOTSPLIT-NOT: {{[0-9]+}} elf-object-writer - Total size of sections written to .dwo file

define void @banana() !dbg !8 {
ret void, !dbg !12
}

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}

!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.1", isOptimized: true, runtimeVersion: 0, splitDebugFilename: "test.dwo", emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: GNU)
!1 = !DIFile(filename: "/tmp/test.c", directory: "/tmp")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{i32 7, !"PIC Level", i32 2}
!7 = !{!"clang version 11.0.1"}
!8 = distinct !DISubprogram(name: "banana", scope: !9, file: !9, line: 1, type: !10, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!9 = !DIFile(filename: "test.c", directory: "/tmp")
!10 = !DISubroutineType(types: !11)
!11 = !{null}
!12 = !DILocation(line: 1, column: 20, scope: !8)
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