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b166b499f9
Summary: Currently -glldb turns on emission of apple tables on all targets, but lldb is only really capable of consuming them on darwin. Furthermore, making lldb consume these tables is not straight-forward because of the differences in how the debug info is distributed on darwin vs. elf targets. The darwin debug model assumes that the debug info (along with accelerator tables) will either remain in the .o files or it will be linked into a dsym bundle by a linker that knows how to merge these tables. In the elf world, all present linkers will simply concatenate these accelerator tables into the shared object. Since the tables are not self-terminating, this renders the tables unusable, as the debugger cannot pry the individual tables apart anymore. It might theoretically be possible to make the tables work with split dwarf, as that is somewhat similar to the apple .o model, but unfortunately right now the combination of -glldb and -gsplit-dwarf produces broken object files. Until these issues are resolved there is no point in emitting the apple tables for these targets. At best, it wastes space; at worst, it breaks compilation and prevents the user from getting other benefits of -glldb. Reviewers: probinson, aprantl, dblaikie Subscribers: emaste, dim, llvm-commits, JDevlieghere Differential Revision: https://reviews.llvm.org/D41986 llvm-svn: 322633
50 lines
2.3 KiB
LLVM
50 lines
2.3 KiB
LLVM
; Verify the emission of accelerator tables for various targets.
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; Darwin has the tables unless we specifically tune for gdb
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; RUN: llc -mtriple=x86_64-apple-darwin12 -filetype=obj < %s | llvm-readobj -sections - | FileCheck --check-prefix=CHECK1 %s
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; RUN: llc -mtriple=x86_64-apple-darwin12 -filetype=obj -debugger-tune=gdb < %s | llvm-readobj -sections - | FileCheck --check-prefix=CHECK2 %s
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; Linux does not have the tables even if we explicitly tune for lldb
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; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj < %s | llvm-readobj -sections - | FileCheck --check-prefix=CHECK2 %s
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; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -debugger-tune=lldb < %s | llvm-readobj -sections - | FileCheck --check-prefix=CHECK2 %s
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; CHECK1: apple_names
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; CHECK2-NOT: apple_names
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@var = thread_local global i32 0, align 4, !dbg !0
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; Function Attrs: norecurse nounwind readnone uwtable
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define void @_Z3funv() local_unnamed_addr #0 !dbg !11 {
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ret void, !dbg !14
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}
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; Function Attrs: norecurse uwtable
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define weak_odr hidden i32* @_ZTW3var() local_unnamed_addr #1 {
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ret i32* @var
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}
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attributes #0 = { norecurse nounwind readnone uwtable }
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attributes #1 = { norecurse uwtable }
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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: "var", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 7.0.0 (trunk 322268) (llvm/trunk 322267)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "debugger-tune.cpp", directory: "/tmp")
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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 2, !"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 7.0.0 (trunk 322268) (llvm/trunk 322267)"}
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!11 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funv", scope: !3, file: !3, line: 2, type: !12, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !2, variables: !4)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null}
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!14 = !DILocation(line: 2, column: 13, scope: !11)
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