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87 lines
3.5 KiB
87 lines
3.5 KiB
4 months ago
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; RUN: llc -debug-entry-values -filetype=asm -o - %s | FileCheck %s
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; The q0 register does not have a DWARF register number, and is instead emitted
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; as a composite location description with two sub-registers. Previously we
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; emitted a single DW_OP_entry_value wrapping that whole composite location
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; description, but that is not valid DWARF; DW_OP_entry_value operations can
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; only hold DWARF expressions and register location descriptions.
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;
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; In the future we may want to emit a composite location description where each
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; DW_OP_regx operation is wrapped in an entry value operation, but for now
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; just verify that no invalid DWARF is emitted.
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target datalayout = "E-m:e-i64:64-n32:64-S128"
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target triple = "sparc64"
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; Based on the following C reproducer:
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;
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; volatile long double global;
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; extern void clobber();
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; int foo(long double p) {
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; global = p;
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; clobber();
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; return 123;
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; }
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; Verify that we got an entry value in the DIExpression...
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; CHECK: DEBUG_VALUE: foo:p <- [DW_OP_LLVM_entry_value 1] $q0
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; ... but that no entry value location was emitted:
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; CHECK: .half 8 ! Loc expr size
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; CHECK-NEXT: .byte 144 ! sub-register DW_OP_regx
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; CHECK-NEXT: .byte 72 ! 72
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; CHECK-NEXT: .byte 147 ! DW_OP_piece
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; CHECK-NEXT: .byte 8 ! 8
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; CHECK-NEXT: .byte 144 ! sub-register DW_OP_regx
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; CHECK-NEXT: .byte 73 ! 73
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; CHECK-NEXT: .byte 147 ! DW_OP_piece
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; CHECK-NEXT: .byte 8 ! 8
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; CHECK-NEXT: .xword 0
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; CHECK-NEXT: .xword 0
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@global = common global fp128 0xL00000000000000000000000000000000, align 16, !dbg !0
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; Function Attrs: nounwind
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define signext i32 @foo(fp128 %p) #0 !dbg !12 {
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entry:
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call void @llvm.dbg.value(metadata fp128 %p, metadata !17, metadata !DIExpression()), !dbg !18
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store volatile fp128 %p, fp128* @global, align 16, !dbg !19
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tail call void @clobber(), !dbg !20
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ret i32 123, !dbg !21
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}
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declare void @clobber()
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone speculatable willreturn }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!8, !9, !10}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "entry-value-complex-reg-expr.c", directory: "/")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
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!7 = !DIBasicType(name: "long double", size: 128, encoding: DW_ATE_float)
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{i32 1, !"wchar_size", i32 4}
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!11 = !{!"clang version 10.0.0"}
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!12 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 3, type: !13, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!15, !7}
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!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!16 = !{!17}
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!17 = !DILocalVariable(name: "p", arg: 1, scope: !12, file: !3, line: 3, type: !7)
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!18 = !DILocation(line: 0, scope: !12)
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!19 = !DILocation(line: 4, scope: !12)
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!20 = !DILocation(line: 5, scope: !12)
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!21 = !DILocation(line: 6, scope: !12)
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