1; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t -experimental-debug-variable-locations=true < %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 -experimental-debug-variable-locations=true < %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 -experimental-debug-variable-locations=true < %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 -experimental-debug-variable-locations=true < %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 +5, DW_OP_stack_value) 21; CHECK-NEXT: DW_AT_name {{.*}} "x" 22 23; CHECK: DW_TAG_variable 24; DWARF32-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x1) loclist = 0x00000020: 25; DWARF64-NEXT: DW_AT_location [DW_FORM_loclistx] (indexed (0x1) loclist = 0x00000034: 26; CHECK-NEXT: [0x0000000000000000, 0x0000000000000003) ".text._Z2f1ii": DW_OP_consts +3, DW_OP_stack_value 27; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004) ".text._Z2f1ii": DW_OP_consts +4, DW_OP_stack_value) 28; CHECK-NEXT: DW_AT_name {{.*}} "y" 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: 0x00000014 => 0x00000020 47; DWARF32-NEXT: 0x00000025 => 0x00000031 48; DWARF64-NEXT: 0x0000000000000018 => 0x0000002c 49; DWARF64-NEXT: 0x0000000000000020 => 0x00000034 50; DWARF64-NEXT: 0x0000000000000031 => 0x00000045 51; CHECK-NEXT: ] 52 53; DWARF32-NEXT: 0x00000018: 54; DWARF64-NEXT: 0x0000002c: 55 56; Show that startx_length can be used when the address range starts at the start of the function. 57 58; CHECK-NEXT: DW_LLE_startx_length (0x0000000000000000, 0x0000000000000003): DW_OP_consts +5, DW_OP_stack_value 59; CHECK-NEXT: DW_LLE_end_of_list () 60 61; Don't use startx_length if there's more than one entry, because the shared 62; base address will be useful for both the range that does start at the start of 63; the function, and the one that doesn't. 64 65; DWARF32: 0x00000020: 66; DWARF64: 0x00000034: 67 68; CHECK-NEXT: DW_LLE_base_addressx (0x0000000000000000) 69; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value 70; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value 71; CHECK-NEXT: DW_LLE_end_of_list () 72 73; And use a base address when the range doesn't start at an existing/useful 74; address in the pool. 75 76; DWARF32: 0x00000031: 77; DWARF64: 0x00000045: 78; CHECK-NEXT: DW_LLE_base_addressx (0x0000000000000000) 79; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX 80; CHECK-NEXT: DW_LLE_end_of_list () 81 82; Built with clang -O3 -ffunction-sections from source: 83; 84; int f1(int i, int j) { 85; int x = 5; 86; int y = 3; 87; int r = i + j; 88; int undef; 89; x = undef; 90; y = 4; 91; return r; 92; } 93; void f2() { 94; } 95 96; Function Attrs: norecurse nounwind readnone uwtable 97define dso_local i32 @_Z2f1ii(i32 %i, i32 %j) local_unnamed_addr !dbg !7 { 98entry: 99 call void @llvm.dbg.value(metadata i32 %i, metadata !12, metadata !DIExpression()), !dbg !18 100 call void @llvm.dbg.value(metadata i32 %j, metadata !13, metadata !DIExpression()), !dbg !18 101 call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !18 102 call void @llvm.dbg.value(metadata i32 3, metadata !15, metadata !DIExpression()), !dbg !18 103 %add = add nsw i32 %j, %i, !dbg !19 104 call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !18 105 call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !18 106 call void @llvm.dbg.value(metadata i32 4, metadata !15, metadata !DIExpression()), !dbg !18 107 ret i32 %add, !dbg !20 108} 109 110; Function Attrs: norecurse nounwind readnone uwtable 111define dso_local void @_Z2f2v() local_unnamed_addr !dbg !21 { 112entry: 113 ret void, !dbg !24 114} 115 116; Function Attrs: nounwind readnone speculatable willreturn 117declare void @llvm.dbg.value(metadata, metadata, metadata) 118 119!llvm.dbg.cu = !{!0} 120!llvm.module.flags = !{!3, !4, !5} 121!llvm.ident = !{!6} 122 123!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) 124!1 = !DIFile(filename: "loc2.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch", checksumkind: CSK_MD5, checksum: "91e0069c680e2a63f4f885ec93f5d07e") 125!2 = !{} 126!3 = !{i32 2, !"Dwarf Version", i32 5} 127!4 = !{i32 2, !"Debug Info Version", i32 3} 128!5 = !{i32 1, !"wchar_size", i32 4} 129!6 = !{!"clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)"} 130!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) 131!8 = !DISubroutineType(types: !9) 132!9 = !{!10, !10, !10} 133!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 134!11 = !{!12, !13, !14, !15, !16, !17} 135!12 = !DILocalVariable(name: "i", arg: 1, scope: !7, file: !1, line: 1, type: !10) 136!13 = !DILocalVariable(name: "j", arg: 2, scope: !7, file: !1, line: 1, type: !10) 137!14 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 2, type: !10) 138!15 = !DILocalVariable(name: "y", scope: !7, file: !1, line: 3, type: !10) 139!16 = !DILocalVariable(name: "r", scope: !7, file: !1, line: 4, type: !10) 140!17 = !DILocalVariable(name: "undef", scope: !7, file: !1, line: 5, type: !10) 141!18 = !DILocation(line: 0, scope: !7) 142!19 = !DILocation(line: 4, column: 13, scope: !7) 143!20 = !DILocation(line: 8, column: 3, scope: !7) 144!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) 145!22 = !DISubroutineType(types: !23) 146!23 = !{null} 147!24 = !DILocation(line: 11, column: 1, scope: !21) 148