[PATCH] D99709: [DebugInfo] Avoid generating DW_TAG_GNU_call_site if no DW_TAG_GNU_call_site_parameter present

[Alok Kumar Sharma via Phabricator via llvm-commits]

alok created this revision.
alok added reviewers: djtodoro, aprantl, jmorse, SouraVX, jini.susan.george, bhuvanendrakumarn.
alok added a project: debug-info.
Herald added a subscriber: hiraditya.
Herald added a reviewer: sscalpone.
alok requested review of this revision.
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  There are conditions when DW_TAG_GNU_call_site is generated which has
  no child of tag DW_TAG_GNU_call_site_parameter. This information does
  not help and only contributes to incresed size of DWARF info.
  Below is the test program.
  ```````````````````````````
  subroutine fun (array)
    integer :: array (*)
  
    array(5:10) = 1311
    array(7) = 1
    array(100) = 100
    return
  end subroutine
  
  program vla
    interface
      subroutine fun (array)
        integer :: array (*)
      end subroutine
    end interface
    integer :: sub_arr(42)
  
    sub_arr(:) = 3
    call fun(sub_arr)
  end program vla
  ```````````````````````````
  which produces,
  0x00000060:     DW_TAG_GNU_call_site
                    DW_AT_abstract_origin (0x00000088 "fun")
                    DW_AT_low_pc  (0x000000000000007a)
  
  0x0000006d:     NULL
  ```````````````````````````


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D99709

Files:
  llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  llvm/test/DebugInfo/X86/dwarf-empty_callsite.ll

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