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168 lines
8.6 KiB
168 lines
8.6 KiB
4 months ago
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; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - | FileCheck %s
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; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - -dwarf-version 5 | FileCheck --check-prefix=DWARF5 %s
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; Group ranges in a range list that apply to the same section and use a base
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; address selection entry to reduce the number of relocations to one reloc per
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; section per range list. DWARF5 debug_rnglist (with *x variants) are more
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; efficient than this in terms of relocations, but it's still better than one
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; reloc per entry in a range list.
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; This is an object/executable size tradeoff - shrinking objects, but growing
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; the linked executable. In one large binary tested, total object size (not just
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; debug info) shrank by 16%, entirely relocation entries. Linked executable
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; grew by 4%. This was with compressed debug info in the objects, uncompressed
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; in the linked executable. Without compression in the objects, the win would be
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; smaller (the growth of debug_ranges itself would be more significant).
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; This is a merged module containing two CUs, one that uses range base address
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; specifiers and exercises different cases there, and another that does not
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; ranges.cpp
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; Single range entry
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; __attribute__((section("a"))) void f1() {}
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; Single address with two ranges due to the whole caused by f3
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; __attribute__((section("b"))) void f2() {}
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; __attribute__((section("b"))) __attribute__((nodebug)) void f3() {}
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; __attribute__((section("b"))) void f4() {}
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; Reset the base address & emit a couple more single range entries
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; __attribute__((section("c"))) void f5() {}
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; __attribute__((section("d"))) void f6() {}
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; ranges_no_base.cpp:
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; Include enough complexity to cause ranges to be emitted, so it can be checked
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; that those ranges don't use base address specifiers
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; __attribute__((section("e"))) void f7() {}
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; __attribute__((section("f"))) void f8() {}
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; CHECK: {{^.Ldebug_ranges0}}
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; CHECK-NEXT: .quad -1
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; CHECK-NEXT: .quad .Lfunc_begin0
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; CHECK-NEXT: .quad .Lfunc_begin0-.Lfunc_begin0
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; CHECK-NEXT: .quad .Lfunc_end0-.Lfunc_begin0
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; CHECK-NEXT: .quad -1
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; CHECK-NEXT: .quad .Lfunc_begin1
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; CHECK-NEXT: .quad .Lfunc_begin1-.Lfunc_begin1
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; CHECK-NEXT: .quad .Lfunc_end1-.Lfunc_begin1
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; CHECK-NEXT: .quad .Lfunc_begin3-.Lfunc_begin1
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; CHECK-NEXT: .quad .Lfunc_end3-.Lfunc_begin1
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; CHECK-NEXT: .quad -1
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; CHECK-NEXT: .quad .Lfunc_begin4
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; CHECK-NEXT: .quad .Lfunc_begin4-.Lfunc_begin4
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; CHECK-NEXT: .quad .Lfunc_end4-.Lfunc_begin4
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; CHECK-NEXT: .quad -1
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; CHECK-NEXT: .quad .Lfunc_begin5
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; CHECK-NEXT: .quad .Lfunc_begin5-.Lfunc_begin5
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; CHECK-NEXT: .quad .Lfunc_end5-.Lfunc_begin5
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; CHECK-NEXT: .quad 0
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; CHECK-NEXT: .quad 0
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; CHECK-NEXT: {{^.Ldebug_ranges1}}
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; CHECK-NEXT: .quad .Lfunc_begin6
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; CHECK-NEXT: .quad .Lfunc_end6
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; CHECK-NEXT: .quad .Lfunc_begin7
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; CHECK-NEXT: .quad .Lfunc_end7
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; DWARF5: {{^.Ldebug_ranges0}}
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; DWARF5-NEXT: # DW_RLE_startx_length
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; DWARF5-NEXT: .byte 0 # start index
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; DWARF5-NEXT: .uleb128 .Lfunc_end0-.Lfunc_begin0 # length
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; DWARF5-NEXT: # DW_RLE_base_addressx
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; DWARF5-NEXT: .byte 1 # base address index
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; DWARF5-NEXT: # DW_RLE_offset_pair
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; DWARF5-NEXT: .uleb128 .Lfunc_begin1-.Lfunc_begin1 # starting offset
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; DWARF5-NEXT: .uleb128 .Lfunc_end1-.Lfunc_begin1 # ending offset
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; DWARF5-NEXT: # DW_RLE_offset_pair
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; DWARF5-NEXT: .uleb128 .Lfunc_begin3-.Lfunc_begin1 # starting offset
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; DWARF5-NEXT: .uleb128 .Lfunc_end3-.Lfunc_begin1 # ending offset
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; DWARF5-NEXT: # DW_RLE_startx_length
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; DWARF5-NEXT: .byte 3 # start index
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; DWARF5-NEXT: .uleb128 .Lfunc_end4-.Lfunc_begin4 # length
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; DWARF5-NEXT: # DW_RLE_startx_length
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; DWARF5-NEXT: .byte 4 # start index
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; DWARF5-NEXT: .uleb128 .Lfunc_end5-.Lfunc_begin5 # length
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; DWARF5-NEXT: # DW_RLE_end_of_list
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; DWARF5-NEXT: {{^.Ldebug_ranges1}}
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; DWARF5-NEXT: # DW_RLE_startx_length
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; DWARF5-NEXT: .byte 5 # start index
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; DWARF5-NEXT: .uleb128 .Lfunc_end6-.Lfunc_begin6 # length
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; DWARF5-NEXT: # DW_RLE_startx_length
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; DWARF5-NEXT: .byte 6 # start index
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; DWARF5-NEXT: .uleb128 .Lfunc_end7-.Lfunc_begin7 # length
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; DWARF5-NEXT: # DW_RLE_end_of_list
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f1v() section "a" !dbg !9 {
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entry:
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ret void, !dbg !12
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f2v() section "b" !dbg !13 {
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entry:
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ret void, !dbg !14
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f3v() section "b" {
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entry:
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ret void
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f4v() section "b" !dbg !15 {
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entry:
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ret void, !dbg !16
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f5v() section "c" !dbg !17 {
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entry:
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ret void, !dbg !18
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f6v() section "d" !dbg !19 {
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entry:
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ret void, !dbg !20
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f7v() section "e" !dbg !21 {
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entry:
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ret void, !dbg !22
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}
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @_Z2f8v() section "f" !dbg !23 {
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entry:
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ret void, !dbg !24
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}
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!llvm.dbg.cu = !{!0, !3}
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!llvm.ident = !{!5, !5}
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!llvm.module.flags = !{!6, !7, !8}
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!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)
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!1 = !DIFile(filename: "ranges.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
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!2 = !{}
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!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)
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!4 = !DIFile(filename: "ranges_no_base.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
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!5 = !{!"clang version 8.0.0 (trunk 346343) (llvm/trunk 346350)"}
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!6 = !{i32 2, !"Dwarf Version", i32 4}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{i32 1, !"wchar_size", i32 4}
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!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)
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!10 = !DISubroutineType(types: !11)
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!11 = !{null}
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!12 = !DILocation(line: 1, column: 42, scope: !9)
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!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)
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!14 = !DILocation(line: 2, column: 42, scope: !13)
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!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)
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!16 = !DILocation(line: 4, column: 42, scope: !15)
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!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)
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!18 = !DILocation(line: 5, column: 42, scope: !17)
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!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)
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!20 = !DILocation(line: 6, column: 42, scope: !19)
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!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)
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!22 = !DILocation(line: 1, column: 42, scope: !21)
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!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)
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!24 = !DILocation(line: 2, column: 42, scope: !23)
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