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bf2572cc9c
Summary: Fixes PR36579. For cases where we had e.g. DBG_VALUE 42 [...] DBG_VALUE undef LiveDebugVariables would discard all undef DBG_VALUEs and then it would look like the variable had the value 42 throughout the rest of the function, which is incorrect. With this patch we don't remove all undef DBG_VALUEs in LiveDebugVariables so they will be kept after register allocation just like other DBG_VALUEs which will yield more correct debug information. Reviewers: aprantl Reviewed By: aprantl Subscribers: bjope, Ka-Ka, JDevlieghere, llvm-commits Differential Revision: https://reviews.llvm.org/D48277 llvm-svn: 335205
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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