1; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t < %s 2; RUN: llvm-dwarfdump -v -debug-info -debug-loclists %t | \ 3; RUN: FileCheck %s --check-prefixes=CHECK,DWARF32 4 5; RUN: llc -dwarf64 -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t < %s 6; RUN: llvm-dwarfdump -v -debug-info -debug-loclists %t | \ 7; RUN: FileCheck %s --check-prefixes=CHECK,DWARF64 8 9; RUN: llc -dwarf-version=5 -split-dwarf-file=foo.dwo -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t < %s 10; RUN: llvm-dwarfdump -v -debug-info -debug-loclists %t | \ 11; RUN: FileCheck %s --check-prefixes=DWO,DWO32 12 13; RUN: llc -dwarf64 -dwarf-version=5 -split-dwarf-file=foo.dwo -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t < %s 14; RUN: llvm-dwarfdump -v -debug-info -debug-loclists %t | \ 15; RUN: FileCheck %s --check-prefixes=DWO,DWO64 16 17; CHECK: DW_TAG_variable 18; DWARF32-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x0) loclist = 0x00000018: 19; DWARF64-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x0) loclist = 0x0000002c: 20; CHECK-NEXT: [0x0000000000000000, 0x0000000000000003) ".text._Z2f1ii": DW_OP_consts +3, DW_OP_stack_value 21; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004) ".text._Z2f1ii": DW_OP_consts +4, DW_OP_stack_value) 22; CHECK-NEXT: DW_AT_name {{.*}} "y" 23 24; CHECK: DW_TAG_variable 25; DWARF32-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x1) loclist = 0x00000029: 26; DWARF64-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x1) loclist = 0x0000003d: 27; CHECK-NEXT: [0x0000000000000000, 0x0000000000000003) ".text._Z2f1ii": DW_OP_consts +5, DW_OP_stack_value) 28; CHECK-NEXT: DW_AT_name {{.*}} "x" 29 30; CHECK: DW_TAG_variable 31; DWARF32-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x2) loclist = 0x00000031: 32; DWARF64-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x2) loclist = 0x00000045: 33; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004) ".text._Z2f1ii": DW_OP_reg0 RAX) 34; CHECK-NEXT: DW_AT_name {{.*}} "r" 35 36; CHECK: .debug_loclists contents: 37; DWARF32-NEXT: 0x00000000: locations list header: length = 0x00000035, format = DWARF32, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000003 38; DWARF64-NEXT: 0x00000000: locations list header: length = 0x0000000000000041, format = DWARF64, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000003 39 40; DWO: .debug_loclists.dwo contents: 41; DWO32-NEXT: 0x00000000: locations list header: length = 0x00000035, format = DWARF32, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000003 42; DWO64-NEXT: 0x00000000: locations list header: length = 0x0000000000000041, format = DWARF64, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000003 43 44; CHECK-NEXT: offsets: [ 45; DWARF32-NEXT: 0x0000000c => 0x00000018 46; DWARF32-NEXT: 0x0000001d => 0x00000029 47; DWARF32-NEXT: 0x00000025 => 0x00000031 48; DWARF64-NEXT: 0x0000000000000018 => 0x0000002c 49; DWARF64-NEXT: 0x0000000000000029 => 0x0000003d 50; DWARF64-NEXT: 0x0000000000000031 => 0x00000045 51; CHECK-NEXT: ] 52 53; Don't use startx_length if there's more than one entry, because the shared 54; base address will be useful for both the range that does start at the start of 55; the function, and the one that doesn't. 56 57; DWARF32-NEXT: 0x00000018: 58; DWARF64-NEXT: 0x0000002c: 59; CHECK-NEXT: DW_LLE_base_addressx (0x0000000000000000) 60; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value 61; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value 62; CHECK-NEXT: DW_LLE_end_of_list () 63 64; Show that startx_length can be used when the address range starts at the start of the function. 65 66; DWARF32: 0x00000029: 67; DWARF64: 0x0000003d: 68; CHECK-NEXT: DW_LLE_startx_length (0x0000000000000000, 0x0000000000000003): DW_OP_consts +5, DW_OP_stack_value 69; CHECK-NEXT: DW_LLE_end_of_list () 70 71; And use a base address when the range doesn't start at an existing/useful 72; address in the pool. 73 74; DWARF32: 0x00000031: 75; DWARF64: 0x00000045: 76; CHECK-NEXT: DW_LLE_base_addressx (0x0000000000000000) 77; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX 78; CHECK-NEXT: DW_LLE_end_of_list () 79 80; Built with clang -O3 -ffunction-sections from source: 81; 82; int f1(int i, int j) { 83; int x = 5; 84; int y = 3; 85; int r = i + j; 86; int undef; 87; x = undef; 88; y = 4; 89; return r; 90; } 91; void f2() { 92; } 93 94; Function Attrs: norecurse nounwind readnone uwtable 95define dso_local i32 @_Z2f1ii(i32 %i, i32 %j) local_unnamed_addr !dbg !7 { 96entry: 97 call void @llvm.dbg.value(metadata i32 %i, metadata !12, metadata !DIExpression()), !dbg !18 98 call void @llvm.dbg.value(metadata i32 %j, metadata !13, metadata !DIExpression()), !dbg !18 99 call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !18 100 call void @llvm.dbg.value(metadata i32 3, metadata !15, metadata !DIExpression()), !dbg !18 101 %add = add nsw i32 %j, %i, !dbg !19 102 call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !18 103 call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !18 104 call void @llvm.dbg.value(metadata i32 4, metadata !15, metadata !DIExpression()), !dbg !18 105 ret i32 %add, !dbg !20 106} 107 108; Function Attrs: norecurse nounwind readnone uwtable 109define dso_local void @_Z2f2v() local_unnamed_addr !dbg !21 { 110entry: 111 ret void, !dbg !24 112} 113 114; Function Attrs: nounwind readnone speculatable willreturn 115declare void @llvm.dbg.value(metadata, metadata, metadata) 116 117!llvm.dbg.cu = !{!0} 118!llvm.module.flags = !{!3, !4, !5} 119!llvm.ident = !{!6} 120 121!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None) 122!1 = !DIFile(filename: "loc2.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch", checksumkind: CSK_MD5, checksum: "91e0069c680e2a63f4f885ec93f5d07e") 123!2 = !{} 124!3 = !{i32 2, !"Dwarf Version", i32 5} 125!4 = !{i32 2, !"Debug Info Version", i32 3} 126!5 = !{i32 1, !"wchar_size", i32 4} 127!6 = !{!"clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)"} 128!7 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1ii", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11) 129!8 = !DISubroutineType(types: !9) 130!9 = !{!10, !10, !10} 131!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 132!11 = !{!12, !13, !14, !15, !16, !17} 133!12 = !DILocalVariable(name: "i", arg: 1, scope: !7, file: !1, line: 1, type: !10) 134!13 = !DILocalVariable(name: "j", arg: 2, scope: !7, file: !1, line: 1, type: !10) 135!14 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 2, type: !10) 136!15 = !DILocalVariable(name: "y", scope: !7, file: !1, line: 3, type: !10) 137!16 = !DILocalVariable(name: "r", scope: !7, file: !1, line: 4, type: !10) 138!17 = !DILocalVariable(name: "undef", scope: !7, file: !1, line: 5, type: !10) 139!18 = !DILocation(line: 0, scope: !7) 140!19 = !DILocation(line: 4, column: 13, scope: !7) 141!20 = !DILocation(line: 8, column: 3, scope: !7) 142!21 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 10, type: !22, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2) 143!22 = !DISubroutineType(types: !23) 144!23 = !{null} 145!24 = !DILocation(line: 11, column: 1, scope: !21) 146