80 lines
3.2 KiB
LLVM
80 lines
3.2 KiB
LLVM
; RUN: opt -passes=inline %s -S -o - -experimental-assignment-tracking \
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; RUN: | FileCheck %s
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;; Hand modified from:
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;; $ cat test.c
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;; int g = 5;
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;; static int callee() {
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;; int local = g;
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;; return local;
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;; }
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;;
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;; int fun() {
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;; return callee();
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;; }
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;;
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;; IR grabbed before inlining in:
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;; $ clang++ -O2 -g
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;; Then modified (see comment in body).
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;; NOTE: Although this reproducer is contrived, this has been observed in real
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;; builds with assignment tracking (dbg.assign intrinsics) - in fact, it caused
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;; verifier failures in some cases using assignment tracking (good). This is
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;; the simplest test I could write.
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;; use-before-defs in debug intrinsics should be preserved through inlining,
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;; or at the very least should be converted to undefs. The previous behaviour
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;; was to replace the use-before-def operand with empty metadata, which signals
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;; cleanup passes that it's okay to remove the debug intrinsic (bad). Check
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;; that this no longer happens.
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; CHECK: define dso_local i32 @fun()
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; CHECK-NEXT: entry
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %0
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@g = dso_local local_unnamed_addr global i32 5, align 4, !dbg !0
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define dso_local i32 @fun() local_unnamed_addr #0 !dbg !11 {
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entry:
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%call = call fastcc i32 @callee(), !dbg !14
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ret i32 %call, !dbg !15
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}
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define internal fastcc i32 @callee() unnamed_addr #1 !dbg !16 {
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entry:
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;; dbg.value moved here from after %0 def.
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call void @llvm.dbg.value(metadata i32 %0, metadata !18, metadata !DIExpression()), !dbg !24
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%0 = load i32, ptr @g, align 4, !dbg !19
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ret i32 %0, !dbg !25
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9}
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!llvm.ident = !{!10}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "g", 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 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
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!3 = !DIFile(filename: "test.c", directory: "/")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!7 = !{i32 7, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = !{!"clang version 12.0.0"}
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!11 = distinct !DISubprogram(name: "fun", scope: !3, file: !3, line: 7, type: !12, scopeLine: 7, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
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!12 = !DISubroutineType(types: !13)
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!13 = !{!6}
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!14 = !DILocation(line: 8, column: 10, scope: !11)
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!15 = !DILocation(line: 8, column: 3, scope: !11)
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!16 = distinct !DISubprogram(name: "callee", scope: !3, file: !3, line: 2, type: !12, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !17)
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!17 = !{!18}
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!18 = !DILocalVariable(name: "local", scope: !16, file: !3, line: 3, type: !6)
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!19 = !DILocation(line: 3, column: 15, scope: !16)
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!24 = !DILocation(line: 0, scope: !16)
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!25 = !DILocation(line: 4, column: 3, scope: !16)
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