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a2029fa58e
In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
73 lines
3.5 KiB
LLVM
73 lines
3.5 KiB
LLVM
; RUN: opt -S -dse -memdep-block-scan-limit=3 < %s | FileCheck %s
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; RUN: opt -S -strip-debug -dse -memdep-block-scan-limit=3 < %s | FileCheck %s
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; Test case to check that the memory dependency analysis gets the same
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; result even if we have a dbg value between the memcpy and
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; store. The memory dependency is then used by DSE to remove the store.
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; We use -memdep-block-scan-limit=3 to be able to create a small test case.
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; Without it, we would need to squeeze in 100 instructions since the default
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; limit is 100.
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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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@g = common global [1 x i8] zeroinitializer, align 1, !dbg !0
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; Function Attrs: noinline nounwind uwtable
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define void @foo() #0 !dbg !14 {
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entry:
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%i = alloca i8, align 1
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store i8 1, i8* %i, align 1, !dbg !19
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !17, metadata !DIExpression()), !dbg !18
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%0 = bitcast [1 x i8]* @g to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %i, i8* %0, i64 1, i1 false), !dbg !20
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br label %bb2
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bb2: ; preds = %0
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ret void, !dbg !21
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #2
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attributes #0 = { noinline nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone speculatable }
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attributes #2 = { argmemonly nounwind }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "g", scope: !2, file: !3, line: 3, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "foo.c", directory: "/bar")
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!4 = !{}
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!5 = !{!0}
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 8, elements: !8)
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!7 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!8 = !{!9}
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!9 = !DISubrange(count: 1)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"wchar_size", i32 4}
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!13 = !{!"clang version 6.0.0"}
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!14 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 5, type: !15, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: false, unit: !2, retainedNodes: !4)
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!15 = !DISubroutineType(types: !16)
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!16 = !{null}
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!17 = !DILocalVariable(name: "i", scope: !14, file: !3, line: 7, type: !7)
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!18 = !DILocation(line: 7, column: 10, scope: !14)
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!19 = !DILocation(line: 8, column: 7, scope: !14)
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!20 = !DILocation(line: 9, column: 5, scope: !14)
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!21 = !DILocation(line: 10, column: 1, scope: !14)
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; Check that the store is removed and that the memcpy is still there
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; CHECK-LABEL: foo
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; CHECK-NOT: store i8
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; CHECK: call void @llvm.memcpy
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; CHECK: ret void
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