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1; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - | FileCheck %s2; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - -dwarf-version 5 | FileCheck --check-prefix=DWARF5 %s3 4; Group ranges in a range list that apply to the same section and use a base5; address selection entry to reduce the number of relocations to one reloc per6; section per range list. DWARF5 debug_rnglist (with *x variants) are more7; efficient than this in terms of relocations, but it's still better than one8; reloc per entry in a range list.9 10; This is an object/executable size tradeoff - shrinking objects, but growing11; the linked executable. In one large binary tested, total object size (not just12; debug info) shrank by 16%, entirely relocation entries. Linked executable13; grew by 4%. This was with compressed debug info in the objects, uncompressed14; in the linked executable. Without compression in the objects, the win would be15; smaller (the growth of debug_ranges itself would be more significant).16 17; This is a merged module containing two CUs, one that uses range base address18; specifiers and exercises different cases there, and another that does not19 20; ranges.cpp21; Single range entry22; __attribute__((section("a"))) void f1() {}23; Single address with two ranges due to the whole caused by f324; __attribute__((section("b"))) void f2() {}25; __attribute__((section("b"))) __attribute__((nodebug)) void f3() {}26; __attribute__((section("b"))) void f4() {}27; Reset the base address & emit a couple more single range entries28; __attribute__((section("c"))) void f5() {}29; __attribute__((section("d"))) void f6() {}30; ranges_no_base.cpp:31; Include enough complexity to cause ranges to be emitted, so it can be checked32; that those ranges don't use base address specifiers33; __attribute__((section("e"))) void f7() {}34; __attribute__((section("f"))) void f8() {}35 36; CHECK: {{^.Ldebug_ranges0}}37; CHECK-NEXT: .quad -138; CHECK-NEXT: .quad .Lfunc_begin039; CHECK-NEXT: .quad .Lfunc_begin0-.Lfunc_begin040; CHECK-NEXT: .quad .Lfunc_end0-.Lfunc_begin041; CHECK-NEXT: .quad -142; CHECK-NEXT: .quad .Lfunc_begin143; CHECK-NEXT: .quad .Lfunc_begin1-.Lfunc_begin144; CHECK-NEXT: .quad .Lfunc_end1-.Lfunc_begin145; CHECK-NEXT: .quad .Lfunc_begin3-.Lfunc_begin146; CHECK-NEXT: .quad .Lfunc_end3-.Lfunc_begin147; CHECK-NEXT: .quad -148; CHECK-NEXT: .quad .Lfunc_begin449; CHECK-NEXT: .quad .Lfunc_begin4-.Lfunc_begin450; CHECK-NEXT: .quad .Lfunc_end4-.Lfunc_begin451; CHECK-NEXT: .quad -152; CHECK-NEXT: .quad .Lfunc_begin553; CHECK-NEXT: .quad .Lfunc_begin5-.Lfunc_begin554; CHECK-NEXT: .quad .Lfunc_end5-.Lfunc_begin555; CHECK-NEXT: .quad 056; CHECK-NEXT: .quad 057; CHECK-NEXT: {{^.Ldebug_ranges1}}58; CHECK-NEXT: .quad .Lfunc_begin659; CHECK-NEXT: .quad .Lfunc_end660; CHECK-NEXT: .quad .Lfunc_begin761; CHECK-NEXT: .quad .Lfunc_end762 63; DWARF5: {{^.Ldebug_ranges0}}64; DWARF5-NEXT: # DW_RLE_startx_length65; DWARF5-NEXT: .byte 0 # start index66; DWARF5-NEXT: .uleb128 .Lfunc_end0-.Lfunc_begin0 # length67; DWARF5-NEXT: # DW_RLE_base_addressx68; DWARF5-NEXT: .byte 1 # base address index69; DWARF5-NEXT: # DW_RLE_offset_pair70; DWARF5-NEXT: .uleb128 .Lfunc_begin1-.Lfunc_begin1 # starting offset71; DWARF5-NEXT: .uleb128 .Lfunc_end1-.Lfunc_begin1 # ending offset72; DWARF5-NEXT: # DW_RLE_offset_pair73; DWARF5-NEXT: .uleb128 .Lfunc_begin3-.Lfunc_begin1 # starting offset74; DWARF5-NEXT: .uleb128 .Lfunc_end3-.Lfunc_begin1 # ending offset75; DWARF5-NEXT: # DW_RLE_startx_length76; DWARF5-NEXT: .byte 3 # start index77; DWARF5-NEXT: .uleb128 .Lfunc_end4-.Lfunc_begin4 # length78; DWARF5-NEXT: # DW_RLE_startx_length79; DWARF5-NEXT: .byte 4 # start index80; DWARF5-NEXT: .uleb128 .Lfunc_end5-.Lfunc_begin5 # length81; DWARF5-NEXT: # DW_RLE_end_of_list82; DWARF5-NEXT: {{^.Ldebug_ranges1}}83; DWARF5-NEXT: # DW_RLE_startx_length84; DWARF5-NEXT: .byte 5 # start index85; DWARF5-NEXT: .uleb128 .Lfunc_end6-.Lfunc_begin6 # length86; DWARF5-NEXT: # DW_RLE_startx_length87; DWARF5-NEXT: .byte 6 # start index88; DWARF5-NEXT: .uleb128 .Lfunc_end7-.Lfunc_begin7 # length89; DWARF5-NEXT: # DW_RLE_end_of_list90 91; Function Attrs: noinline nounwind optnone uwtable92define dso_local void @_Z2f1v() section "a" !dbg !9 {93entry:94 ret void, !dbg !1295}96 97; Function Attrs: noinline nounwind optnone uwtable98define dso_local void @_Z2f2v() section "b" !dbg !13 {99entry:100 ret void, !dbg !14101}102 103; Function Attrs: noinline nounwind optnone uwtable104define dso_local void @_Z2f3v() section "b" {105entry:106 ret void107}108 109; Function Attrs: noinline nounwind optnone uwtable110define dso_local void @_Z2f4v() section "b" !dbg !15 {111entry:112 ret void, !dbg !16113}114 115; Function Attrs: noinline nounwind optnone uwtable116define dso_local void @_Z2f5v() section "c" !dbg !17 {117entry:118 ret void, !dbg !18119}120 121; Function Attrs: noinline nounwind optnone uwtable122define dso_local void @_Z2f6v() section "d" !dbg !19 {123entry:124 ret void, !dbg !20125}126 127; Function Attrs: noinline nounwind optnone uwtable128define dso_local void @_Z2f7v() section "e" !dbg !21 {129entry:130 ret void, !dbg !22131}132 133; Function Attrs: noinline nounwind optnone uwtable134define dso_local void @_Z2f8v() section "f" !dbg !23 {135entry:136 ret void, !dbg !24137}138 139!llvm.dbg.cu = !{!0, !3}140!llvm.ident = !{!5, !5}141!llvm.module.flags = !{!6, !7, !8}142 143!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 (trunk 346343) (llvm/trunk 346350)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None, rangesBaseAddress: true)144!1 = !DIFile(filename: "ranges.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")145!2 = !{}146!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 8.0.0 (trunk 346343) (llvm/trunk 346350)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)147!4 = !DIFile(filename: "ranges_no_base.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")148!5 = !{!"clang version 8.0.0 (trunk 346343) (llvm/trunk 346350)"}149!6 = !{i32 2, !"Dwarf Version", i32 4}150!7 = !{i32 2, !"Debug Info Version", i32 3}151!8 = !{i32 1, !"wchar_size", i32 4}152!9 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v", scope: !1, file: !1, line: 1, type: !10, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)153!10 = !DISubroutineType(types: !11)154!11 = !{null}155!12 = !DILocation(line: 1, column: 42, scope: !9)156!13 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)157!14 = !DILocation(line: 2, column: 42, scope: !13)158!15 = distinct !DISubprogram(name: "f4", linkageName: "_Z2f4v", scope: !1, file: !1, line: 4, type: !10, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)159!16 = !DILocation(line: 4, column: 42, scope: !15)160!17 = distinct !DISubprogram(name: "f5", linkageName: "_Z2f5v", scope: !1, file: !1, line: 5, type: !10, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)161!18 = !DILocation(line: 5, column: 42, scope: !17)162!19 = distinct !DISubprogram(name: "f6", linkageName: "_Z2f6v", scope: !1, file: !1, line: 6, type: !10, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)163!20 = !DILocation(line: 6, column: 42, scope: !19)164!21 = distinct !DISubprogram(name: "f7", linkageName: "_Z2f7v", scope: !4, file: !4, line: 1, type: !10, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !3, retainedNodes: !2)165!22 = !DILocation(line: 1, column: 42, scope: !21)166!23 = distinct !DISubprogram(name: "f8", linkageName: "_Z2f8v", scope: !4, file: !4, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !3, retainedNodes: !2)167!24 = !DILocation(line: 2, column: 42, scope: !23)168