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06b3595fcf
Summary: This caused incorrect debug information for parameters: Previously, after a COPY of a parameter that changes the width, we would emit a DBG_VALUE that continues to be associated to that parameter, even though it now used a different width. This made the LiveDebugValues pass assume the parameter value got clobbered and it stopped tracking the parameter entry value, leading to incorrect debug information. Fixes https://bugs.llvm.org/show_bug.cgi?id=39715 Subscribers: aprantl, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D80819
59 lines
2.5 KiB
LLVM
59 lines
2.5 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -start-after=codegenprepare -stop-before=finalize-isel -o - %s | FileCheck %s
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; Input to this test looked like this and was compiled using: clang -g -O1 -mllvm -stop-after=codegenprepare -S
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;
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; int fn1(long t1) {
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; return t;
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; }
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;
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; Catch metadata references for involved variables.
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;
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; CHECK-DAG: ![[T1:.*]] = !DILocalVariable(name: "t1"
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define dso_local i32 @fn1(i64 %t1) local_unnamed_addr #0 !dbg !7 {
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; We expect that the same width COPY reuses the debug location,
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; but the width narrowing COPY does not.
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;
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; CHECK-LABEL: name: fn1
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; CHECK: DBG_VALUE $rdi, $noreg, ![[T1]], !DIExpression(),
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; CHECK-NEXT: %0:gr64 = COPY $rdi
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; CHECK-NEXT: DBG_VALUE %0, $noreg, ![[T1]], !DIExpression(),
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; CHECK-NEXT: %1:gr32 = COPY %0.sub_32bit
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; CHECK-NEXT: COPY
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; CHECK-NEXT: RET
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entry:
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call void @llvm.dbg.value(metadata i64 %t1, metadata !13, metadata !DIExpression()), !dbg !14
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%0 = trunc i64 %t1 to i32, !dbg !15
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ret i32 %0, !dbg !16
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { norecurse nounwind readnone uwtable }
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attributes #1 = { nounwind readnone speculatable willreturn }
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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_C_plus_plus_14, file: !1, producer: "clang version 11.0.0 (git@github.com:tbosch/llvm-project.git 0b11aed869bf09ba60
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d7ed17334cf0b76e6a5922)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.cc", directory: "")
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!2 = !{}
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!3 = !{i32 7, !"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 11.0.0 (git@github.com:tbosch/llvm-project.git 0b11aed869bf09ba60d7ed17334cf0b76e6a5922)"}
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!7 = distinct !DISubprogram(name: "fn1", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !11}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!12 = !{!13}
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!13 = !DILocalVariable(name: "t1", arg: 1, scope: !7, file: !1, line: 1, type: !11)
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!14 = !DILocation(line: 0, scope: !7)
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!15 = !DILocation(line: 2, column: 10, scope: !7)
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!16 = !DILocation(line: 2, column: 3, scope: !7)
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