; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t < %s ; RUN: llvm-dwarfdump -v -debug-info -debug-loclists %t | FileCheck %s ; CHECK: DW_TAG_variable ; FIXME: Use DW_FORM_loclistx to reduce relocations ; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000000c ; CHECK-NEXT: [0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value ; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value) ; CHECK-NEXT: DW_AT_name {{.*}} "y" ; CHECK: DW_TAG_variable ; FIXME: Use DW_FORM_loclistx to reduce relocations ; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000001d ; CHECK-NEXT: Addr idx 0 (w/ length 3): DW_OP_consts +5, DW_OP_stack_value) ; CHECK-NEXT: DW_AT_name {{.*}} "x" ; CHECK: DW_TAG_variable ; FIXME: Use DW_FORM_loclistx to reduce relocations ; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x00000025 ; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX) ; CHECK-NEXT: DW_AT_name {{.*}} "r" ; CHECK: .debug_loclists contents: ; CHECK-NEXT: 0x00000000: locations list header: length = 0x00000029, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000000 ; Don't use startx_length if there's more than one entry, because the shared ; base address will be useful for both the range that does start at the start of ; the function, and the one that doesn't. ; CHECK-NEXT: 0x0000000c: ; CHECK-NEXT: DW_LLE_base_addressx(0x0000000000000000) ; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000000, 0x0000000000000003) ; CHECK-NEXT: => [0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value ; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004) ; CHECK-NEXT: => [0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value ; CHECK-NEXT: DW_LLE_end_of_list () ; Show that startx_length can be used when the address range starts at the start of the function. ; CHECK: 0x0000001d: ; CHECK-NEXT: DW_LLE_startx_length(0x0000000000000000, 0x0000000000000003) ; CHECK-NEXT: => Addr idx 0 (w/ length 3): DW_OP_consts +5, DW_OP_stack_value ; CHECK-NEXT: DW_LLE_end_of_list () ; And use a base address when the range doesn't start at an existing/useful ; address in the pool. ; CHECK: 0x00000025: ; CHECK-NEXT: DW_LLE_base_addressx(0x0000000000000000) ; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004) ; CHECK-NEXT: => [0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX ; CHECK-NEXT: DW_LLE_end_of_list () ; Built with clang -O3 -ffunction-sections from source: ; ; int f1(int i, int j) { ; int x = 5; ; int y = 3; ; int r = i + j; ; int undef; ; x = undef; ; y = 4; ; return r; ; } ; void f2() { ; } ; Function Attrs: norecurse nounwind readnone uwtable define dso_local i32 @_Z2f1ii(i32 %i, i32 %j) local_unnamed_addr !dbg !7 { entry: call void @llvm.dbg.value(metadata i32 %i, metadata !12, metadata !DIExpression()), !dbg !18 call void @llvm.dbg.value(metadata i32 %j, metadata !13, metadata !DIExpression()), !dbg !18 call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !18 call void @llvm.dbg.value(metadata i32 3, metadata !15, metadata !DIExpression()), !dbg !18 %add = add nsw i32 %j, %i, !dbg !19 call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !18 call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !18 call void @llvm.dbg.value(metadata i32 4, metadata !15, metadata !DIExpression()), !dbg !18 ret i32 %add, !dbg !20 } ; Function Attrs: norecurse nounwind readnone uwtable define dso_local void @_Z2f2v() local_unnamed_addr !dbg !21 { entry: ret void, !dbg !24 } ; Function Attrs: nounwind readnone speculatable willreturn declare void @llvm.dbg.value(metadata, metadata, metadata) !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!3, !4, !5} !llvm.ident = !{!6} !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) !1 = !DIFile(filename: "loc2.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch", checksumkind: CSK_MD5, checksum: "91e0069c680e2a63f4f885ec93f5d07e") !2 = !{} !3 = !{i32 2, !"Dwarf Version", i32 5} !4 = !{i32 2, !"Debug Info Version", i32 3} !5 = !{i32 1, !"wchar_size", i32 4} !6 = !{!"clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)"} !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) !8 = !DISubroutineType(types: !9) !9 = !{!10, !10, !10} !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !11 = !{!12, !13, !14, !15, !16, !17} !12 = !DILocalVariable(name: "i", arg: 1, scope: !7, file: !1, line: 1, type: !10) !13 = !DILocalVariable(name: "j", arg: 2, scope: !7, file: !1, line: 1, type: !10) !14 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 2, type: !10) !15 = !DILocalVariable(name: "y", scope: !7, file: !1, line: 3, type: !10) !16 = !DILocalVariable(name: "r", scope: !7, file: !1, line: 4, type: !10) !17 = !DILocalVariable(name: "undef", scope: !7, file: !1, line: 5, type: !10) !18 = !DILocation(line: 0, scope: !7) !19 = !DILocation(line: 4, column: 13, scope: !7) !20 = !DILocation(line: 8, column: 3, scope: !7) !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) !22 = !DISubroutineType(types: !23) !23 = !{null} !24 = !DILocation(line: 11, column: 1, scope: !21)