32417b3203
This patch fixes an issue in which SSA value reference within a DIArgList would be unnecessarily dropped by llvm-link, even when invoking on a single file (which should be a no-op). The reason for the difference is that the ValueMapper does not refer to the RF_IgnoreMissingLocals flag for LocalAsMetadata contained within a DIArgList; this flag is used for direct LocalAsMetadata uses to preserve SSA references even when the ValueMapper does not have an explicit mapping for the referenced SSA value, which appears to always be the case when using llvm-link in this manner. Differential Revision: https://reviews.llvm.org/D114355
39 lines
1.8 KiB
LLVM
39 lines
1.8 KiB
LLVM
; RUN: llvm-link -S %s | FileCheck %s
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; Test that when a debug metadata use-before-def is run through llvm-link, the
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; value reference is preserved. Tests both singular uses and DIArgList uses of
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; the value.
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; CHECK-LABEL: @test
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; CHECK: call void @llvm.dbg.value(metadata i32 %A,
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; CHECK-NEXT: call void @llvm.dbg.value(metadata !DIArgList(i32 0, i32 %A),
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; CHECK-NEXT: %A =
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target datalayout = "e-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024"
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target triple = "spir64-unknown-unknown-intelfpga"
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define void @test() {
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entry:
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call void @llvm.dbg.value(metadata i32 %A, metadata !5, metadata !DIExpression()), !dbg !10
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call void @llvm.dbg.value(metadata !DIArgList(i32 0, i32 %A), metadata !5, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_minus, DW_OP_stack_value)), !dbg !10
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%A = add i32 0, 1
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ret void
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "bogus", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "test")
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!2 = !{i32 7, !"Dwarf Version", i32 4}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !DILocalVariable(name: "A", arg: 2, scope: !6, file: !1, line: 60, type: !9)
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!6 = distinct !DISubprogram(name: "test", linkageName: "_test", scope: !1, file: !1, line: 60, type: !7, scopeLine: 61, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !DILocation(line: 0, scope: !6)
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