forked from OSchip/llvm-project
66 lines
2.2 KiB
LLVM
66 lines
2.2 KiB
LLVM
; RUN: llc -O1 -o - %s | FileCheck %s
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; Check that dbg.value(undef) calls are not simply discarded.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @foo() !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i32 42, metadata !11, metadata !DIExpression()), !dbg !13
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call void (...) @bar(), !dbg !14
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call void @llvm.dbg.value(metadata i32 undef, metadata !11, metadata !DIExpression()), !dbg !13
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call void (...) @bar(), !dbg !15
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ret void, !dbg !16
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}
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declare void @bar(...)
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #0
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attributes #0 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 7.0.0"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !10)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !{!11}
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!11 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 4, type: !12)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = !DILocation(line: 4, column: 7, scope: !7)
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!14 = !DILocation(line: 5, column: 3, scope: !7)
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!15 = !DILocation(line: 7, column: 3, scope: !7)
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!16 = !DILocation(line: 8, column: 1, scope: !7)
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; Original C program:
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; void bar();
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;
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; void foo() {
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; int x = 42;
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; bar();
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; x = 23;
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; bar();
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; }
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;
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; Then the dbg.value for the x = 23 setting has been replaced with dbg.value(undef)
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; in this ll file to provoke the wanted behavior in LiveDebugVariables.
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; Variable 'x' should thus be updated two times, first to 42 and then to undef.
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; CHECK-LABEL: foo:
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; CHECK: #DEBUG_VALUE: foo:x <- 42
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; CHECK: callq bar
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; CHECK: #DEBUG_VALUE: foo:x <- undef
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; CHECK: callq bar
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