[NFC][DwarfDebug] Add test for variables with a single location which
don't span their entire scope. Reviewed By: aprantl, vsk Differential Revision: https://reviews.llvm.org/D79573
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OCHyams
156
llvm/test/DebugInfo/X86/location-range.mir
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156
llvm/test/DebugInfo/X86/location-range.mir
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# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
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# RUN: | llvm-dwarfdump - | FileCheck %s
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#
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# Generated with opt -sroa, llc -stop-after=livedebugvalues, with some metadata
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# removed by hand:
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# long a, b, c;
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# long funone() {
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# unsigned localone;
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# if (c)
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# return b;
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# // Location should start here.
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# localone = 0;
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# return a;
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# }
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#
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# short funtwo() {
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# union {
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# char b[2];
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# short c;
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# } localtwo;
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# {
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# // Location should start here.
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# memcpy(localtwo.b, 0, 2);
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# }
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# return localtwo.c;
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# }
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#
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# Check that the local variables each have a location range which reflects the
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# fact that they're both unavailable at the start of the functions.
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#
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# CHECK: DW_TAG_subprogram
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# CHECK: DW_AT_name ("funone")
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# CHECK: DW_TAG_variable
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# CHECK: DW_AT_location
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# CHECK-NEXT: [0x{{[0-9a-z]+}}, 0x{{[0-9a-z]+}}):
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# CHECK-NEXT: DW_AT_name ("localone")
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# CHECK: DW_TAG_subprogram
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# CHECK: DW_AT_name ("funtwo")
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# CHECK: DW_TAG_variable
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# CHECK: DW_AT_location
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# CHECK-NEXT: [0x{{[0-9a-z]+}}, 0x{{[0-9a-z]+}}):
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# CHECK-NEXT: DW_AT_name ("localtwo")
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--- |
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target triple = "x86_64-unknown-linux-gnu"
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@c = dso_local global i64 0, align 8, !dbg !0
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@b = dso_local global i64 0, align 8, !dbg !9
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@a = dso_local global i64 0, align 8, !dbg !6
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define dso_local i64 @funone() !dbg !15 {
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entry:
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%0 = load i64, i64* @c, align 8, !dbg !21
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%tobool = icmp ne i64 %0, 0, !dbg !21
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br i1 %tobool, label %if.then, label %if.end, !dbg !27
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if.then: ; preds = %entry
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%1 = load i64, i64* @b, align 8, !dbg !21
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br label %cleanup, !dbg !21
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if.end: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 0, metadata !19, metadata !DIExpression()), !dbg !27
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%2 = load i64, i64* @a, align 8, !dbg !27
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br label %cleanup, !dbg !27
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cleanup: ; preds = %if.end, %if.then
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%retval.0 = phi i64 [ %1, %if.then ], [ %2, %if.end ], !dbg !27
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ret i64 %retval.0, !dbg !27
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}
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define dso_local signext i16 @funtwo() !dbg !34 {
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entry:
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%localtwo.sroa.0.0.copyload = load i16, i16* null, align 1, !dbg !48
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call void @llvm.dbg.value(metadata i16 %localtwo.sroa.0.0.copyload, metadata !39, metadata !DIExpression()), !dbg !51
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ret i16 %localtwo.sroa.0.0.copyload, !dbg !51
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}
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!11, !12, !13}
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!llvm.ident = !{!14}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
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!3 = !DIFile(filename: "test.c", directory: "/")
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!4 = !{}
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!5 = !{!6, !9, !0}
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!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
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!10 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
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!11 = !{i32 7, !"Dwarf Version", i32 4}
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!12 = !{i32 2, !"Debug Info Version", i32 3}
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!13 = !{i32 1, !"wchar_size", i32 4}
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!14 = !{!"clang version 11.0.0"}
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!15 = distinct !DISubprogram(name: "funone", scope: !3, file: !3, line: 3, type: !16, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !18)
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!16 = !DISubroutineType(types: !17)
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!17 = !{!8}
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!18 = !{!19}
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!19 = !DILocalVariable(name: "localone", scope: !15, file: !3, line: 4, type: !20)
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!20 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!21 = !DILocation(line: 5, column: 7, scope: !22)
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!22 = distinct !DILexicalBlock(scope: !15, file: !3, line: 5, column: 7)
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!27 = !DILocation(line: 5, column: 7, scope: !15)
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!34 = distinct !DISubprogram(name: "funtwo", scope: !3, file: !3, line: 13, type: !35, scopeLine: 13, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38)
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!35 = !DISubroutineType(types: !36)
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!36 = !{!37}
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!37 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
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!38 = !{!39}
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!39 = !DILocalVariable(name: "localtwo", scope: !34, file: !3, line: 17, type: !40)
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!40 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !34, file: !3, line: 14, size: 16, elements: !41)
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!41 = !{!42, !47}
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!42 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !40, file: !3, line: 15, baseType: !43, size: 16)
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!43 = !DICompositeType(tag: DW_TAG_array_type, baseType: !44, size: 16, elements: !45)
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!44 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!45 = !{!46}
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!46 = !DISubrange(count: 2)
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!47 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !40, file: !3, line: 16, baseType: !37, size: 16)
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!48 = !DILocation(line: 20, column: 5, scope: !49)
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!49 = distinct !DILexicalBlock(scope: !34, file: !3, line: 18, column: 3)
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!51 = !DILocation(line: 22, column: 3, scope: !34)
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...
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---
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name: funone
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body: |
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bb.0.entry:
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successors: %bb.1(0x50000000), %bb.2(0x30000000)
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CMP64mi8 $rip, 1, $noreg, @c, $noreg, 0, implicit-def $eflags, debug-location !21 :: (dereferenceable load 8 from @c)
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JCC_1 %bb.2, 4, implicit killed $eflags, debug-location !27
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bb.1.if.then:
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renamable $rax = MOV64rm $rip, 1, $noreg, @b, $noreg, debug-location !21 :: (dereferenceable load 8 from @b)
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RETQ $rax, debug-location !27
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bb.2.if.end:
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DBG_VALUE 0, $noreg, !19, !DIExpression(), debug-location !27
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renamable $rax = MOV64rm $rip, 1, $noreg, @a, $noreg, debug-location !27 :: (dereferenceable load 8 from @a)
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RETQ $rax, debug-location !27
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...
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---
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name: funtwo
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body: |
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bb.0.entry:
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$eax = MOVZX32rm16 $noreg, 1, $noreg, 0, $noreg, debug-location !48 :: (load 2 from `i16* null`, align 1)
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DBG_VALUE $ax, $noreg, !39, !DIExpression(), debug-location !51
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RETQ $ax, debug-location !51
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...
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