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Fix bug in cas-friendly-debug-info option. #11641

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Merged
merged 1 commit into from
Oct 21, 2025
Merged

Fix bug in cas-friendly-debug-info option. #11641

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2 changes: 1 addition & 1 deletion llvm/lib/MC/MCDwarf.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -181,7 +181,7 @@ void MCDwarfLineTable::emitOne(
auto init = [&]() {
// Force emission of DW_LNS_set_file for every function's contribution to
// the line table to maximize deduplication.
FileNum = MCOS->getGenerateCasFriendlyDebugInfo() ? 0 : 1;
FileNum = MCOS->getGenerateCasFriendlyDebugInfo() ? -1 : 1;
LastLine = 1;
Column = 0;
Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
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29 changes: 29 additions & 0 deletions llvm/test/CAS/cas-friendly-debug-info.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
; RUN: rm -rf %t && mkdir -p %t
; RUN: llc --filetype=obj -cas-friendly-debug-info %s -o %t/cas-friendly.o
; RUN: llvm-dwarfdump %t/cas-friendly.o --debug-line | FileCheck %s
; CHECK: Address Line Column File ISA Discriminator OpIndex Flags
; CHECK-NEXT: ------------------ ------ ------ ------ --- ------------- ------- -------------
; CHECK-NOT: 0x0000000000000000 0 0 1 0 0 0 is_stmt
; CHECK-NEXT: 0x0000000000000000 0 0 0 0 0 0 is_stmt
; REQUIRES: arm-registered-target

define i32 @_Z3fooi(i32 noundef %x) #0 !dbg !9 {
entry:
%x.addr = alloca i32
%0 = load i32, ptr %x.addr, align 4
%add = add nsw i32 %0, 1, !dbg !18
ret i32 %add
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !7}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, emissionKind: FullDebug, sysroot: "/")
!1 = !DIFile(filename: "/tmp/a.cpp", directory: "/", checksumkind: CSK_MD5, checksum: "80e82b6b66c04b9cfb438eb7c6672107")
!2 = !{i32 7, !"Dwarf Version", i32 5}
!3 = !{i32 2,!"Debug Info Version", i32 3}
!7 = !{i32 7, !"frame-pointer", i32 1}
!9 = distinct !DISubprogram(file: !10, type: !11, unit: !0, retainedNodes: !14)
!10 = !DIFile(filename: "/tmp/a.cpp", directory: "", checksumkind: CSK_MD5, checksum: "80e82b6b66c04b9cfb438eb7c6672107")
!11 = !DISubroutineType(types: !12)
!12 = !{}
!14 = !{}
!18 = !DILocation(scope: !9)