1; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - -use-dwarf-ranges-base-address-specifier | FileCheck --check-prefix=COMMON --check-prefix=BASE %s 2; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - | FileCheck --check-prefix=COMMON --check-prefix=NOBASE %s 3; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - -dwarf-version 5 | FileCheck --check-prefix=DWARF5 %s 4 5; Group ranges in a range list that apply to the same section and use a base 6; address selection entry to reduce the number of relocations to one reloc per 7; section per range list. DWARF5 debug_rnglist (with *x variants) are more 8; efficient than this in terms of relocations, but it's still better than one 9; reloc per entry in a range list. 10 11; This is an object/executable size tradeoff - shrinking objects, but growing 12; the linked executable. In one large binary tested, total object size (not just 13; debug info) shrank by 16%, entirely relocation entries. Linked executable 14; grew by 4%. This was with compressed debug info in the objects, uncompressed 15; in the linked executable. Without compression in the objects, the win would be 16; smaller (the growth of debug_ranges itself would be more significant). 17 18; COMMON: {{^.Ldebug_ranges0}} 19; COMMON-NEXT: .quad .Lfunc_begin0 20; COMMON-NEXT: .quad .Lfunc_end0 21; BASE-NEXT: .quad -1 22; BASE-NEXT: .quad .Lfunc_begin1 23; BASE-NEXT: .quad .Lfunc_begin1-.Lfunc_begin1 24; BASE-NEXT: .quad .Lfunc_end1-.Lfunc_begin1 25; BASE-NEXT: .quad .Lfunc_begin3-.Lfunc_begin1 26; BASE-NEXT: .quad .Lfunc_end3-.Lfunc_begin1 27; BASE-NEXT: .quad -1 28; BASE-NEXT: .quad 0 29; NOBASE-NEXT: .quad .Lfunc_begin1 30; NOBASE-NEXT: .quad .Lfunc_end1 31; NOBASE-NEXT: .quad .Lfunc_begin3 32; NOBASE-NEXT: .quad .Lfunc_end3 33; COMMON-NEXT: .quad .Lfunc_begin4 34; COMMON-NEXT: .quad .Lfunc_end4 35; COMMON-NEXT: .quad .Lfunc_begin5 36; COMMON-NEXT: .quad .Lfunc_end5 37; COMMON-NEXT: .quad 0 38; COMMON-NEXT: .quad 0 39 40; DWARF5: {{^.Ldebug_ranges0}} 41; DWARF5-NEXT: # DW_RLE_start_length 42; DWARF5-NEXT: .quad .Lfunc_begin0 # start 43; DWARF5-NEXT: .uleb128 .Lfunc_end0-.Lfunc_begin0 # length 44; DWARF5-NEXT: # DW_RLE_base_address 45; DWARF5-NEXT: .quad .Lfunc_begin1 # base address 46; DWARF5-NEXT: # DW_RLE_offset_pair 47; DWARF5-NEXT: .uleb128 .Lfunc_begin1-.Lfunc_begin1 # starting offset 48; DWARF5-NEXT: .uleb128 .Lfunc_end1-.Lfunc_begin1 # ending offset 49; DWARF5-NEXT: # DW_RLE_offset_pair 50; DWARF5-NEXT: .uleb128 .Lfunc_begin3-.Lfunc_begin1 # starting offset 51; DWARF5-NEXT: .uleb128 .Lfunc_end3-.Lfunc_begin1 # ending offset 52; DWARF5-NEXT: # DW_RLE_start_length 53; DWARF5-NEXT: .quad .Lfunc_begin4 # start 54; DWARF5-NEXT: .uleb128 .Lfunc_end4-.Lfunc_begin4 # length 55; DWARF5-NEXT: # DW_RLE_start_length 56; DWARF5-NEXT: .quad .Lfunc_begin5 # start 57; DWARF5-NEXT: .uleb128 .Lfunc_end5-.Lfunc_begin5 # length 58; DWARF5-NEXT: # DW_RLE_end_of_list 59 60; Function Attrs: noinline nounwind optnone uwtable 61define void @_Z2f1v() #0 section "a" !dbg !7 { 62entry: 63 ret void, !dbg !10 64} 65 66; Function Attrs: noinline nounwind optnone uwtable 67define void @_Z2f2v() #0 section "b" !dbg !11 { 68entry: 69 ret void, !dbg !12 70} 71 72; Function Attrs: noinline nounwind optnone uwtable 73define void @_Z2f3v() #0 section "b" { 74entry: 75 ret void 76} 77 78; Function Attrs: noinline nounwind optnone uwtable 79define void @_Z2f4v() #0 section "b" !dbg !13 { 80entry: 81 ret void, !dbg !14 82} 83 84; Function Attrs: noinline nounwind optnone uwtable 85define void @_Z2f5v() #0 section "e" !dbg !15 { 86entry: 87 ret void, !dbg !16 88} 89 90; Function Attrs: noinline nounwind optnone uwtable 91define void @_Z2f6v() #0 section "f" !dbg !17 { 92entry: 93 ret void, !dbg !18 94} 95 96attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } 97 98!llvm.dbg.cu = !{!0} 99!llvm.module.flags = !{!3, !4, !5} 100!llvm.ident = !{!6} 101 102!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 6.0.0 (trunk 309523) (llvm/trunk 309526)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 103!1 = !DIFile(filename: "funcs.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch") 104!2 = !{} 105!3 = !{i32 2, !"Dwarf Version", i32 4} 106!4 = !{i32 2, !"Debug Info Version", i32 3} 107!5 = !{i32 1, !"wchar_size", i32 4} 108!6 = !{!"clang version 6.0.0 (trunk 309523) (llvm/trunk 309526)"} 109!7 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 110!8 = !DISubroutineType(types: !9) 111!9 = !{null} 112!10 = !DILocation(line: 1, column: 42, scope: !7) 113!11 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 114!12 = !DILocation(line: 2, column: 42, scope: !11) 115!13 = distinct !DISubprogram(name: "f4", linkageName: "_Z2f4v", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 116!14 = !DILocation(line: 4, column: 42, scope: !13) 117!15 = distinct !DISubprogram(name: "f5", linkageName: "_Z2f5v", scope: !1, file: !1, line: 5, type: !8, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 118!16 = !DILocation(line: 5, column: 42, scope: !15) 119!17 = distinct !DISubprogram(name: "f6", linkageName: "_Z2f6v", scope: !1, file: !1, line: 6, type: !8, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 120!18 = !DILocation(line: 6, column: 42, scope: !17) 121