1; RUN: llc %s -stop-before finalize-isel -o - \ 2; RUN: -experimental-debug-variable-locations=false \ 3; RUN: -debug-ata-coalesce-frags=true \ 4; RUN: | FileCheck %s --check-prefixes=CHECK,DBGVALUE --implicit-check-not=DBG_VALUE 5 6; RUN: llc --try-experimental-debuginfo-iterators %s -stop-before finalize-isel -o - \ 7; RUN: -experimental-debug-variable-locations=false \ 8; RUN: -debug-ata-coalesce-frags=true \ 9; RUN: | FileCheck %s --check-prefixes=CHECK,DBGVALUE --implicit-check-not=DBG_VALUE 10; RUN: llc %s -stop-before finalize-isel -o - \ 11; RUN: -experimental-debug-variable-locations=true \ 12; RUN: | FileCheck %s --check-prefixes=CHECK,INSTRREF --implicit-check-not=DBG_VALUE \ 13; RUN: --implicit-check-not=DBG_INSTR_REF 14 15 16; RUN: llc --try-experimental-debuginfo-iterators %s -stop-before finalize-isel -o - \ 17; RUN: -experimental-debug-variable-locations=true \ 18; RUN: | FileCheck %s --check-prefixes=CHECK,INSTRREF --implicit-check-not=DBG_VALUE \ 19; RUN: --implicit-check-not=DBG_INSTR_REF 20 21;; Check that dbg.assigns for an aggregate variable which lives on the stack 22;; for some of its lifetime are lowered into an appropriate set of DBG_VALUEs. 23;; 24;; $ cat test.cpp 25;; void esc(long* p); 26;; struct Ex { 27;; long A; 28;; long B; 29;; }; 30;; long fun() { 31;; Ex X; 32;; X.B = 0; 33;; esc(&X.B); 34;; X.B += 2; 35;; return X.B; 36;; } 37;; $ clang++ test.cpp -O2 -g -emit-llvm -S -c -Xclang -fexperimental-assignment-tracking 38 39; CHECK: ![[VAR:[0-9]+]] = !DILocalVariable(name: "X", 40;; Check we have no debug info for local in the side table. 41; CHECK: stack: 42; CHECK-NEXT: - { id: 0, name: X, type: default, offset: 0, size: 16, alignment: 8, 43; CHECK-NEXT: stack-id: default, callee-saved-register: '', callee-saved-restored: true, 44; CHECK-NEXT: debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 45 46;; Initially the whole variable is on the stack. 47; CHECK: bb.0.entry: 48; CHECK-NEXT: DBG_VALUE %stack.0.X, $noreg, ![[VAR]], !DIExpression(DW_OP_deref), debug-location 49 50;; Then there is a store to the upper 64 bits. 51; CHECK: MOV64mi32 %stack.0.X, 1, $noreg, 8, $noreg, 0, debug-location 52;; No change in variable location: the stack home is still valid. 53 54;; The final assignment (X.B += 2) doesn't get stored back to the alloca. This 55;; means that that the stack location isn't valid for the entire lifetime of X. 56; DBGVALUE: %2:gr64 = nsw ADD64ri32 %1, 2, implicit-def dead $eflags, debug-location 57; DBGVALUE-NEXT: DBG_VALUE %2, $noreg, ![[VAR]], !DIExpression(DW_OP_LLVM_fragment, 64, 64), debug-location 58; INSTRREF: %2:gr64 = nsw ADD64ri32 %1, 2, implicit-def dead $eflags, debug-instr-number 1 59; INSTRREF-NEXT: DBG_INSTR_REF ![[VAR]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_fragment, 64, 64), dbg-instr-ref(1, 0), debug-location 60 61;; Bits [0, 64) are still stack homed. FIXME, this particular reinstatement is 62;; unnecessary. 63; CHECK-NEXT: DBG_VALUE %stack.0.X, $noreg, ![[VAR]], !DIExpression(DW_OP_deref, DW_OP_LLVM_fragment, 0, 64) 64 65source_filename = "test.cpp" 66target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 67target triple = "x86_64-unknown-linux-gnu" 68 69%struct.Ex = type { i64, i64 } 70 71define dso_local i64 @_Z3funv() local_unnamed_addr !dbg !7 { 72entry: 73 %X = alloca %struct.Ex, align 8, !DIAssignID !17 74 call void @llvm.dbg.assign(metadata i1 undef, metadata !12, metadata !DIExpression(), metadata !17, metadata ptr %X, metadata !DIExpression()), !dbg !18 75 %B = getelementptr inbounds %struct.Ex, ptr %X, i64 0, i32 1, !dbg !20 76 store i64 0, ptr %B, align 8, !dbg !21, !DIAssignID !27 77 call void @llvm.dbg.assign(metadata i64 0, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !27, metadata ptr %B, metadata !DIExpression()), !dbg !21 78 call void @_Z3escPl(ptr nonnull %B), !dbg !28 79 %0 = load i64, ptr %B, align 8, !dbg !29 80 %add = add nsw i64 %0, 2, !dbg !29 81 call void @llvm.dbg.assign(metadata i64 %add, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64), metadata !30, metadata ptr %B, metadata !DIExpression()), !dbg !29 82 ret i64 %add, !dbg !32 83} 84 85declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) 86declare !dbg !33 dso_local void @_Z3escPl(ptr) local_unnamed_addr 87declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) 88declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) 89 90!llvm.dbg.cu = !{!0} 91!llvm.module.flags = !{!3, !4, !5, !1000} 92!llvm.ident = !{!6} 93 94!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) 95!1 = !DIFile(filename: "test.cpp", directory: "/") 96!2 = !{} 97!3 = !{i32 7, !"Dwarf Version", i32 4} 98!4 = !{i32 2, !"Debug Info Version", i32 3} 99!5 = !{i32 1, !"wchar_size", i32 4} 100!6 = !{!"clang version 12.0.0"} 101!7 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funv", scope: !1, file: !1, line: 6, type: !8, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11) 102!8 = !DISubroutineType(types: !9) 103!9 = !{!10} 104!10 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) 105!11 = !{!12} 106!12 = !DILocalVariable(name: "X", scope: !7, file: !1, line: 7, type: !13) 107!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Ex", file: !1, line: 2, size: 128, flags: DIFlagTypePassByValue, elements: !14, identifier: "_ZTS2Ex") 108!14 = !{!15, !16} 109!15 = !DIDerivedType(tag: DW_TAG_member, name: "A", scope: !13, file: !1, line: 3, baseType: !10, size: 64) 110!16 = !DIDerivedType(tag: DW_TAG_member, name: "B", scope: !13, file: !1, line: 4, baseType: !10, size: 64, offset: 64) 111!17 = distinct !DIAssignID() 112!18 = !DILocation(line: 0, scope: !7) 113!19 = !DILocation(line: 7, column: 3, scope: !7) 114!20 = !DILocation(line: 8, column: 5, scope: !7) 115!21 = !DILocation(line: 8, column: 7, scope: !7) 116!27 = distinct !DIAssignID() 117!28 = !DILocation(line: 9, column: 3, scope: !7) 118!29 = !DILocation(line: 10, column: 7, scope: !7) 119!30 = distinct !DIAssignID() 120!31 = !DILocation(line: 12, column: 1, scope: !7) 121!32 = !DILocation(line: 11, column: 3, scope: !7) 122!33 = !DISubprogram(name: "esc", linkageName: "_Z3escPl", scope: !1, file: !1, line: 1, type: !34, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2) 123!34 = !DISubroutineType(types: !35) 124!35 = !{null, !36} 125!36 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64) 126!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true} 127