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llvm-project/llvm/test/DebugInfo/X86/accel-tables-dwarf5.ll

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[DebugInfo] Generate .debug_names section when it makes sense Summary: This patch makes us generate the debug_names section in response to some user-facing commands (previously it was only generated if explicitly selected via the -accel-tables option). My goal was to make this work for DWARF>=5 (as it's an official part of that standard), and also, as an extension, for DWARF<5 if one is explicitly tuning for lldb as a debugger (because it brings a large performance improvement there). This is slightly complicated by the fact that the debug_names tables are incompatible with the DWARF v4 type units (they assume that the type units are in the debug_info section), and unfortunately, right now we generate DWARF v4-style type units even for -gdwarf-5. For this reason, I disable all accelerator tables if the user requested type unit generation. I do this even for apple tables, as they have the same problem (in fact generating type units for apple targets makes us crash even before we get around to emitting the accelerator tables). Reviewers: JDevlieghere, aprantl, dblaikie, echristo, probinson Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D49420 llvm-svn: 337544
2018-07-20 20:59:05 +08:00
; Verify the emission of accelerator tables for the DWARF v5 case.
; debug_names should be emitted regardless of the target and debugger tuning
; RUN: llc -mtriple=x86_64-apple-darwin12 -filetype=obj < %s \
; RUN: | llvm-readobj -sections - | FileCheck --check-prefix=DEBUG_NAMES %s
; RUN: llc -mtriple=x86_64-apple-darwin12 -filetype=obj -debugger-tune=gdb < %s \
; RUN: | llvm-readobj -sections - | FileCheck --check-prefix=DEBUG_NAMES %s
; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj < %s \
; RUN: | llvm-readobj -sections - | FileCheck --check-prefix=DEBUG_NAMES %s
; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -debugger-tune=lldb < %s \
; RUN: | llvm-readobj -sections - | FileCheck --check-prefix=DEBUG_NAMES %s
; But not if also type units are enabled.
; TODO: This is the case because we currently don't generate DWARF v5-compatible
; type units. Change this once DWARF v5 type units are implemented.
; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -generate-type-units -debugger-tune=lldb < %s \
; RUN: | llvm-readobj -sections - | FileCheck --check-prefix=NONE %s
; RUN: llc -mtriple=x86_64-apple-darwin12 -generate-type-units -filetype=obj < %s \
; RUN: | llvm-readobj -sections - | FileCheck --check-prefix=NONE %s
; NONE-NOT: apple_names
; NONE-NOT: debug_names
; DEBUG_NAMES-NOT: apple_names
; DEBUG_NAMES: debug_names
; DEBUG_NAMES-NOT: apple_names
@x = common dso_local global i32 0, align 4, !dbg !0
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!8, !9, !10}
!llvm.ident = !{!11}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "x", scope: !2, file: !6, line: 1, type: !7, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (trunk 337260) (llvm/trunk 337262)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "-", directory: "/tmp", checksumkind: CSK_MD5, checksum: "06c25fe0c80b8959051a62f8f034710a")
!4 = !{}
!5 = !{!0}
!6 = !DIFile(filename: "<stdin>", directory: "/tmp", checksumkind: CSK_MD5, checksum: "06c25fe0c80b8959051a62f8f034710a")
!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!8 = !{i32 2, !"Dwarf Version", i32 5}
!9 = !{i32 2, !"Debug Info Version", i32 3}
!10 = !{i32 1, !"wchar_size", i32 4}
!11 = !{!"clang version 7.0.0 (trunk 337260) (llvm/trunk 337262)"}