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llvm-project/llvm/test/CodeGen/X86/dbg-line-0-no-discriminator.ll

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[DWARF] Line 0 should not have a discriminator. It's meaningless and takes up extra space in the line table. Differential Revision: https://reviews.llvm.org/D37364 llvm-svn: 312751
2017-09-08 06:15:44 +08:00
; RUN: llc -filetype=obj -use-unknown-locations=Enable -mtriple=x86_64-unknown-linux %s -o %t
llvm-dwarfdump: Replace -debug-dump=sect option with individual options. As discussed on llvm-dev in http://lists.llvm.org/pipermail/llvm-dev/2017-September/117301.html this changes the command line interface of llvm-dwarfdump to match the one used by the dwarfdump utility shipping on macOS. In addition to being shorter to type this format also has the advantage of allowing more than one section to be specified at the same time. In a nutshell, with this change $ llvm-dwarfdump --debug-dump=info $ llvm-dwarfdump --debug-dump=apple-objc becomes $ dwarfdump --debug-info --apple-objc Differential Revision: https://reviews.llvm.org/D37714 llvm-svn: 312970
2017-09-12 06:59:45 +08:00
; RUN: llvm-dwarfdump -debug-line %t | FileCheck %s
[DWARF] Line 0 should not have a discriminator. It's meaningless and takes up extra space in the line table. Differential Revision: https://reviews.llvm.org/D37364 llvm-svn: 312751
2017-09-08 06:15:44 +08:00
define void @_Z3bazv() !dbg !6 {
call void @_Z3foov(), !dbg !9
call void @_Z3foov() ; no !dbg, so will be marked as line 0
ret void, !dbg !11
}
declare void @_Z3foov()
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 267219)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test.cc", directory: ".")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 3.9.0 (trunk 267219)"}
[DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 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
2018-05-09 10:40:45 +08:00
!6 = distinct !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !1, file: !1, line: 3, type: !7, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
[DWARF] Line 0 should not have a discriminator. It's meaningless and takes up extra space in the line table. Differential Revision: https://reviews.llvm.org/D37364 llvm-svn: 312751
2017-09-08 06:15:44 +08:00
!7 = !DISubroutineType(types: !8)
!8 = !{null}
!9 = !DILocation(line: 4, column: 3, scope: !10)
!10 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 1)
!11 = !DILocation(line: 6, column: 1, scope: !6)
; Look at the lengths. We can't verify the line-number-program size
; directly, but the difference in the two lengths should not change
; unexpectedly.
Re-submit r289925 (Update .debug_line section version to match DWARF version) Set the .debug_line version to match the requested DWARF version, except with a maximum of v4 because we don't support v5 yet. Previously Chromium had issues with this patch; see PR31407. Chromium tool issues have been addressed, so hopefully this will go through this time. Patch by Katya Romanova! Differential Revision: https://reviews.llvm.org/D38002 llvm-svn: 319699
2017-12-05 05:27:46 +08:00
; CHECK: total_length: 0x00000044
; CHECK: prologue_length: 0x0000001f
[DWARF] Line 0 should not have a discriminator. It's meaningless and takes up extra space in the line table. Differential Revision: https://reviews.llvm.org/D37364 llvm-svn: 312751
2017-09-08 06:15:44 +08:00
;
; Verify that we see a line entry with a discriminator, and the next entry
; has line 0 and no discriminator.
; line column file ISA discriminator
; CHECK: 4 3 1 0 1
; CHECK-NEXT: 0 3 1 0 0