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Differential D94801

[AMDGPU] Test case demonstrating issues with generation of .debug_frame
ClosedPublic

Authored by RamNalamothu on Jan 15 2021, 9:27 AM.

Details

Reviewers
MaskRay
dblaikie
asl
scott.linder
t-tye
probinson
Commits
rGb6c3a59c3f55: [AMDGPU] Test case demonstrating issues with generation of .debug_frame
Summary

This test case demonstrates that the Call Frame Information generation is
totally biased towards whether exceptions are enabled or not. Currently
LLVM does not generate CFI i.e. a .debug_frame for debug purpose even
if --force-dwarf-frame-section is enabled unless exceptions are enabled.

Diff Detail

Event Timeline

RamNalamothu created this revision.Jan 15 2021, 9:27 AM
Herald added subscribers: kerbowa, tpr, dstuttard and 4 others. · View Herald TranscriptJan 15 2021, 9:27 AM
RamNalamothu requested review of this revision.Jan 15 2021, 9:27 AM
Herald added a project: Restricted Project. · View Herald TranscriptJan 15 2021, 9:27 AM
Herald added subscribers: llvm-commits, wdng. · View Herald Transcript
Harbormaster completed remote builds in B85373: Diff 316999.Jan 15 2021, 10:39 AM
Herald added a subscriber: ormris. · View Herald TranscriptJan 15 2021, 10:39 AM
scott.linder accepted this revision.Jan 21 2021, 8:35 AM
This revision is now accepted and ready to land.Jan 21 2021, 8:35 AM
Closed by commit rGb6c3a59c3f55: [AMDGPU] Test case demonstrating issues with generation of .debug_frame (authored by RamNalamothu). · Explain WhyJan 21 2021, 6:09 PM
This revision was automatically updated to reflect the committed changes.
RamNalamothu added a commit: rGb6c3a59c3f55: [AMDGPU] Test case demonstrating issues with generation of .debug_frame.

Revision Contents

PathSize
llvm/
test/
CodeGen/
AMDGPU/
28 lines

Diff 318375

llvm/test/CodeGen/AMDGPU/debug_frame.ll

  • This file was added.
; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=NOEXCEPTIONS_NOFORCE-DEBUG %s
; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj --force-dwarf-frame-section -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=NOEXCEPTIONS_FORCE-DEBUG %s
; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj --exception-model=dwarf -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=EXCEPTIONS_NOFORCE-DEBUG %s
; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj --force-dwarf-frame-section --exception-model=dwarf -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=EXCEPTIONS_FORCE-DEBUG %s
; Test that demonstrates we produce a .debug_frame only when exceptions are enabled even if --force-dwarf-frame-section is enabled
; NOEXCEPTIONS_NOFORCE-DEBUG-NOT: .debug_frame
; NOEXCEPTIONS_FORCE-DEBUG-NOT: .debug_frame
; EXCEPTIONS_NOFORCE-DEBUG: .debug_frame
; EXCEPTIONS_FORCE-DEBUG: .debug_frame
define void @f() nounwind !dbg !0 {
entry:
ret void
}
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7}
!5 = !{!0}
!0 = distinct !DISubprogram(name: "f", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, scopeLine: 1, file: !6, scope: !1, type: !3)
!1 = !DIFile(filename: "/home/espindola/llvm/test.c", directory: "/home/espindola/llvm/build")
!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: true, emissionKind: FullDebug, file: !6, enums: !{}, retainedTypes: !{})
!3 = !DISubroutineType(types: !4)
!4 = !{null}
!6 = !DIFile(filename: "/home/espindola/llvm/test.c", directory: "/home/espindola/llvm/build")
!7 = !{i32 1, !"Debug Info Version", i32 3}