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1; RUN: llc -O1 -o - %s | FileCheck %s2 3; Check that dbg.value(undef) calls are not simply discarded.4 5target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"6target triple = "x86_64-unknown-linux-gnu"7 8define void @foo() !dbg !7 {9entry:10 call void @llvm.dbg.value(metadata i32 42, metadata !11, metadata !DIExpression()), !dbg !1311 call void (...) @bar(), !dbg !1412 call void @llvm.dbg.value(metadata i32 undef, metadata !11, metadata !DIExpression()), !dbg !1313 call void (...) @bar(), !dbg !1514 ret void, !dbg !1615}16 17declare void @bar(...)18 19; Function Attrs: nounwind readnone speculatable20declare void @llvm.dbg.value(metadata, metadata, metadata) #021 22attributes #0 = { nounwind readnone speculatable }23 24!llvm.dbg.cu = !{!0}25!llvm.module.flags = !{!3, !4, !5}26!llvm.ident = !{!6}27 28!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)29!1 = !DIFile(filename: "test.c", directory: "/tmp")30!2 = !{}31!3 = !{i32 2, !"Dwarf Version", i32 4}32!4 = !{i32 2, !"Debug Info Version", i32 3}33!5 = !{i32 1, !"wchar_size", i32 4}34!6 = !{!"clang version 7.0.0"}35!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)36!8 = !DISubroutineType(types: !9)37!9 = !{null}38!10 = !{!11}39!11 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 4, type: !12)40!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)41!13 = !DILocation(line: 4, column: 7, scope: !7)42!14 = !DILocation(line: 5, column: 3, scope: !7)43!15 = !DILocation(line: 7, column: 3, scope: !7)44!16 = !DILocation(line: 8, column: 1, scope: !7)45 46; Original C program:47; void bar();48;49; void foo() {50; int x = 42;51; bar();52; x = 23;53; bar();54; }55;56; Then the dbg.value for the x = 23 setting has been replaced with dbg.value(undef)57; in this ll file to provoke the wanted behavior in LiveDebugVariables.58 59; Variable 'x' should thus be updated two times, first to 42 and then to undef.60 61; CHECK-LABEL: foo:62; CHECK: #DEBUG_VALUE: foo:x <- 4263; CHECK: callq bar64; CHECK: #DEBUG_VALUE: foo:x <- undef65; CHECK: callq bar66