1 ; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - | FileCheck %s
2 ; RUN: llc -filetype=asm -mtriple=x86_64-pc-linux-gnu %s -o - -dwarf-version 5 | FileCheck --check-prefix=DWARF5 %s
4 ; Group ranges in a range list that apply to the same section and use a base
5 ; address selection entry to reduce the number of relocations to one reloc per
6 ; section per range list. DWARF5 debug_rnglist (with *x variants) are more
7 ; efficient than this in terms of relocations, but it's still better than one
8 ; reloc per entry in a range list.
10 ; This is an object/executable size tradeoff - shrinking objects, but growing
11 ; the linked executable. In one large binary tested, total object size (not just
12 ; debug info) shrank by 16%, entirely relocation entries. Linked executable
13 ; grew by 4%. This was with compressed debug info in the objects, uncompressed
14 ; in the linked executable. Without compression in the objects, the win would be
15 ; smaller (the growth of debug_ranges itself would be more significant).
17 ; This is a merged module containing two CUs, one that uses range base address
18 ; specifiers and exercises different cases there, and another that does not
22 ; __attribute__((section("a"))) void f1() {}
23 ; Single address with two ranges due to the whole caused by f3
24 ; __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 entries
28 ; __attribute__((section("c"))) void f5() {}
29 ; __attribute__((section("d"))) void f6() {}
31 ; Include enough complexity to cause ranges to be emitted, so it can be checked
32 ; that those ranges don't use base address specifiers
33 ; __attribute__((section("e"))) void f7() {}
34 ; __attribute__((section("f"))) void f8() {}
36 ; CHECK: {{^.Ldebug_ranges0}}
37 ; CHECK-NEXT: .quad -1
38 ; CHECK-NEXT: .quad .Lfunc_begin0
39 ; CHECK-NEXT: .quad .Lfunc_begin0-.Lfunc_begin0
40 ; CHECK-NEXT: .quad .Lfunc_end0-.Lfunc_begin0
41 ; CHECK-NEXT: .quad -1
42 ; CHECK-NEXT: .quad .Lfunc_begin1
43 ; CHECK-NEXT: .quad .Lfunc_begin1-.Lfunc_begin1
44 ; CHECK-NEXT: .quad .Lfunc_end1-.Lfunc_begin1
45 ; CHECK-NEXT: .quad .Lfunc_begin3-.Lfunc_begin1
46 ; CHECK-NEXT: .quad .Lfunc_end3-.Lfunc_begin1
47 ; CHECK-NEXT: .quad -1
48 ; CHECK-NEXT: .quad .Lfunc_begin4
49 ; CHECK-NEXT: .quad .Lfunc_begin4-.Lfunc_begin4
50 ; CHECK-NEXT: .quad .Lfunc_end4-.Lfunc_begin4
51 ; CHECK-NEXT: .quad -1
52 ; CHECK-NEXT: .quad .Lfunc_begin5
53 ; CHECK-NEXT: .quad .Lfunc_begin5-.Lfunc_begin5
54 ; CHECK-NEXT: .quad .Lfunc_end5-.Lfunc_begin5
57 ; CHECK-NEXT: {{^.Ldebug_ranges1}}
58 ; CHECK-NEXT: .quad .Lfunc_begin6
59 ; CHECK-NEXT: .quad .Lfunc_end6
60 ; CHECK-NEXT: .quad .Lfunc_begin7
61 ; CHECK-NEXT: .quad .Lfunc_end7
63 ; DWARF5: {{^.Ldebug_ranges0}}
64 ; DWARF5-NEXT: # DW_RLE_startx_length
65 ; DWARF5-NEXT: .byte 0 # start index
66 ; DWARF5-NEXT: .uleb128 .Lfunc_end0-.Lfunc_begin0 # length
67 ; DWARF5-NEXT: # DW_RLE_base_addressx
68 ; DWARF5-NEXT: .byte 1 # base address index
69 ; DWARF5-NEXT: # DW_RLE_offset_pair
70 ; DWARF5-NEXT: .uleb128 .Lfunc_begin1-.Lfunc_begin1 # starting offset
71 ; DWARF5-NEXT: .uleb128 .Lfunc_end1-.Lfunc_begin1 # ending offset
72 ; DWARF5-NEXT: # DW_RLE_offset_pair
73 ; DWARF5-NEXT: .uleb128 .Lfunc_begin3-.Lfunc_begin1 # starting offset
74 ; DWARF5-NEXT: .uleb128 .Lfunc_end3-.Lfunc_begin1 # ending offset
75 ; DWARF5-NEXT: # DW_RLE_startx_length
76 ; DWARF5-NEXT: .byte 3 # start index
77 ; DWARF5-NEXT: .uleb128 .Lfunc_end4-.Lfunc_begin4 # length
78 ; DWARF5-NEXT: # DW_RLE_startx_length
79 ; DWARF5-NEXT: .byte 4 # start index
80 ; DWARF5-NEXT: .uleb128 .Lfunc_end5-.Lfunc_begin5 # length
81 ; DWARF5-NEXT: # DW_RLE_end_of_list
82 ; DWARF5-NEXT: {{^.Ldebug_ranges1}}
83 ; DWARF5-NEXT: # DW_RLE_startx_length
84 ; DWARF5-NEXT: .byte 5 # start index
85 ; DWARF5-NEXT: .uleb128 .Lfunc_end6-.Lfunc_begin6 # length
86 ; DWARF5-NEXT: # DW_RLE_startx_length
87 ; DWARF5-NEXT: .byte 6 # start index
88 ; DWARF5-NEXT: .uleb128 .Lfunc_end7-.Lfunc_begin7 # length
89 ; DWARF5-NEXT: # DW_RLE_end_of_list
91 ; Function Attrs: noinline nounwind optnone uwtable
92 define dso_local void @_Z2f1v() section "a" !dbg !9 {
97 ; Function Attrs: noinline nounwind optnone uwtable
98 define dso_local void @_Z2f2v() section "b" !dbg !13 {
103 ; Function Attrs: noinline nounwind optnone uwtable
104 define dso_local void @_Z2f3v() section "b" {
109 ; Function Attrs: noinline nounwind optnone uwtable
110 define dso_local void @_Z2f4v() section "b" !dbg !15 {
115 ; Function Attrs: noinline nounwind optnone uwtable
116 define dso_local void @_Z2f5v() section "c" !dbg !17 {
121 ; Function Attrs: noinline nounwind optnone uwtable
122 define dso_local void @_Z2f6v() section "d" !dbg !19 {
127 ; Function Attrs: noinline nounwind optnone uwtable
128 define dso_local void @_Z2f7v() section "e" !dbg !21 {
133 ; Function Attrs: noinline nounwind optnone uwtable
134 define dso_local void @_Z2f8v() section "f" !dbg !23 {
139 !llvm.dbg.cu = !{!0, !3}
140 !llvm.ident = !{!5, !5}
141 !llvm.module.flags = !{!6, !7, !8}
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, debugBaseAddress: true)
144 !1 = !DIFile(filename: "ranges.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
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)
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)