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2bf8b5c7d4
We aim to ignore changes in variable locations during the prologue and epilogue of functions, to avoid using space documenting location changes that aren't visible. However in D61940 / r362951 this got ripped out as the previous implementation was unsound. Instead, use the FrameDestroy flag to identify when we're in the epilogue of a function, and ignore variable location changes accordingly. This fits in with existing code that examines the FrameSetup flag. Some variable locations get shuffled in modified tests as they now cover greater ranges, which is what would be expected. Some additional single-location variables are generated too. Two tests are un-xfailed, they were only xfailed due to r362951 deleting functionality they depended on. Apparently some out-of-tree backends don't accurately maintain FrameDestroy flags -- if you're an out-of-tree maintainer and see changes in variable locations disappear due to a faulty FrameDestroy flag, it's safe to back this change out. The impact is just slightly more debug info than necessary. Differential Revision: https://reviews.llvm.org/D62314 llvm-svn: 363245
64 lines
2.4 KiB
LLVM
64 lines
2.4 KiB
LLVM
; RUN: llc %s -o %t.s
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; RUN: llvm-mc -triple x86_64--linux %t.s -filetype=obj -o %t.o
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; RUN: FileCheck < %t.s %s
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; RUN: llvm-dwarfdump %t.o | FileCheck %s --check-prefix=DWARF
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; Unlike dbg.declare, dbg.addr should be lowered to DBG_VALUE instructions. It
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; is control-dependent.
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; CHECK-LABEL: use_dbg_addr:
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; CHECK: #DEBUG_VALUE: use_dbg_addr:o <- [$rsp+0]
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; DWARF: DW_TAG_variable
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; DWARF-NEXT: DW_AT_location (DW_OP_fbreg +0)
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; DWARF-NEXT: DW_AT_name ("o")
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; ModuleID = 't.c'
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source_filename = "t.c"
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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--linux"
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%struct.Foo = type { i32 }
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; Function Attrs: noinline nounwind uwtable
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define void @use_dbg_addr() #0 !dbg !7 {
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entry:
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%o = alloca %struct.Foo, align 4
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call void @llvm.dbg.addr(metadata %struct.Foo* %o, metadata !10, metadata !15), !dbg !16
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call void @escape_foo(%struct.Foo* %o), !dbg !17
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ret void, !dbg !18
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.addr(metadata, metadata, metadata) #1
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declare void @escape_foo(%struct.Foo*)
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attributes #0 = { noinline nounwind uwtable }
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attributes #1 = { 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 6.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
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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 6.0.0 "}
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!7 = distinct !DISubprogram(name: "use_dbg_addr", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !DILocalVariable(name: "o", scope: !7, file: !1, line: 4, type: !11)
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!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, elements: !12)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !11, file: !1, line: 1, baseType: !14, size: 32)
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!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!15 = !DIExpression()
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!16 = !DILocation(line: 4, column: 14, scope: !7)
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!17 = !DILocation(line: 5, column: 3, scope: !7)
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!18 = !DILocation(line: 6, column: 1, scope: !7)
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