Re: [Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions
> On Dec 8, 2018, at 6:24 AM, Gil Moses via Dwarf-Discuss
> wrote:
>
> Hi,
>
> Building with Xcode 7, once in a while I get the following warnings from the
> dsymutil tool (a few dozens):
> "could not find referenced DIE"
> Followed be a segmentation fault.
>
> Adding the verbosity flag, I got detailed information about the DIEs that had
> the error, e.g.:
> ===
> while processing
> /p4client/ProAudio/dev_main/ProAudio/XcodeBuildProducts/Debug/libWaveShell-Common.a(GraphicStream_Utils.o):
> warning: could not find referenced DIE
>in DIE:
>
> 0x0001415e: DW_TAG_imported_declaration [99]
>DW_AT_decl_file [DW_FORM_data1]
> ("/Applications/Xcode7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/sys/_types/_time_t.h")
>DW_AT_decl_line [DW_FORM_data2](20047)
>DW_AT_import [DW_FORM_ref4](cu + 0x4c4f5254 =>
> {0x4c4f5254})
>
>
> How do I go about understanding the error, what caused it and how to solve it?
> BTW, the lib size being built is around 350MB. Could there be a size issue
> causing this seg fault?
If you have questions about Apple-specific versions of the various LLVM tools,
the best way to get in contact is to file a bugreport on
https://bugreport.apple.com/.
The version of dsymutil that you are using (700) is quite old. Is using a newer
version from a more recent Xcode an option for you?
> While I'm here, where could I download the full source code of dsymutil? All
> I found was links to separate files
> (https://opensource.apple.com/source/clang/clang-700.0.72/src/tools/dsymutil/)
Dsymutil is part of the LLVM project, if you want to build it from source,
you'll need to download LLVM and compile the "dsymutil" target. The
https://opensource.apple.com/source/clang/clang-700.0.72/src directory you
mentioned should contains the entire LLVM project. Instructions for building it
can be found here: http://llvm.org/docs/GettingStarted.html.
That said, I would recommend trying a more recent version of dsymutil first.
-- adrian
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Re: [Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions
> 0x0001415e: DW_TAG_imported_declaration [99]
> DW_AT_decl_file [DW_FORM_data1]
> ("/Applications/Xcode7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/sys/_types/_time_t.h")
> DW_AT_decl_line [DW_FORM_data2] (20047)
> DW_AT_import [DW_FORM_ref4] (cu + 0x4c4f5254 =>
> {0x4c4f5254})
>
>
> How do I go about understanding the error, what caused it and how to solve it?
> BTW, the lib size being built is around 350MB. Could there be a size issue
> causing this seg fault?
The offset it gives, 0x4c4f5254, is much too large for a file in the
350MB range, so this is clearly bogus. The value is ASCII for "LORT"
-- it looks like an ASCII string has made its way into your DWARF info
somehow.
-cary
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Re: [Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions
On 12/09/2018 07:27 AM, Gil Moses via Dwarf-Discuss wrote: Hi Michael, Although it might be a bug in Clang, I'd like to get a grip on the DWARF side of it - i.e. understanding the error and tracking down the root cause. Also, since dsymutil is an open source project util that generates DWARF files, I was hoping someone would know where to download the project. Then, I might be able to debug my problem. DW_TAG_imported_declaration is the DWARF representation of "using" in C++ (and similar constructs in other languages). It says to include the DWARF DIE (and its children) which are pointed to by the DW_AT_import attribute (an offset in the current compilation unit) into the current scope. Appendix D.3 in the DWARF Version 5 spec has an example. In the error you received, dsymutil says that it could not find the DIE that the DW_AT_import referenced. You can look at the DWARF debug info (using readelf or dwarfdump) and see what is at offset 0x4c4f5254. If that is not a DIE, then the DWARF generated by clang is incorrect. If it is a DIE, then dysmutil is confused. -- Michael Eagerea...@eagerm.com 1960 Park Blvd., Palo Alto, CA 94306 ___ Dwarf-Discuss mailing list Dwarf-Discuss@lists.dwarfstd.org http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
Re: [Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions
BTW, following your advice I also posted in two other lists - CLang and LLVM. Gil. ___ Dwarf-Discuss mailing list Dwarf-Discuss@lists.dwarfstd.org http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
Re: [Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions
Hi Michael, Although it might be a bug in Clang, I'd like to get a grip on the DWARF side of it - i.e. understanding the error and tracking down the root cause. Also, since dsymutil is an open source project util that generates DWARF files, I was hoping someone would know where to download the project. Then, I might be able to debug my problem. Thanks, Gil. ___ Dwarf-Discuss mailing list Dwarf-Discuss@lists.dwarfstd.org http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
Re: [Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions
On 12/08/2018 06:24 AM, Gil Moses via Dwarf-Discuss wrote:
Hi,
Building with Xcode 7, once in a while I get the following warnings from the
dsymutil tool (a few dozens):
"could not find referenced DIE"
Followed be a segmentation fault.
Adding the verbosity flag, I got detailed information about the DIEs that had
the error, e.g.:
===
while processing
/p4client/ProAudio/dev_main/ProAudio/XcodeBuildProducts/Debug/libWaveShell-Common.a(GraphicStream_Utils.o):
warning: could not find referenced DIE
in DIE:
0x0001415e: DW_TAG_imported_declaration [99]
DW_AT_decl_file [DW_FORM_data1]
("/Applications/Xcode7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/sys/_types/_time_t.h")
DW_AT_decl_line [DW_FORM_data2](20047)
DW_AT_import [DW_FORM_ref4](cu + 0x4c4f5254 =>
{0x4c4f5254})
How do I go about understanding the error, what caused it and how to solve it?
BTW, the lib size being built is around 350MB. Could there be a size issue
causing this seg fault?
While I'm here, where could I download the full source code of dsymutil? All I
found was links to separate files
(https://opensource.apple.com/source/clang/clang-700.0.72/src/tools/dsymutil/)
Thanks,
Gil Moses.
Hi Gil --
This is not really a question about DWARF. This looks like a bug
in Clang. You would get more help with this by sending your question to
the LLVM/Clang mailing list.
--
Michael Eagerea...@eagerm.com
1960 Park Blvd., Palo Alto, CA 94306
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[Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions
Hi,
Building with Xcode 7, once in a while I get the following warnings from the
dsymutil tool (a few dozens):
"could not find referenced DIE"
Followed be a segmentation fault.
Adding the verbosity flag, I got detailed information about the DIEs that had
the error, e.g.:
===
while processing
/p4client/ProAudio/dev_main/ProAudio/XcodeBuildProducts/Debug/libWaveShell-Common.a(GraphicStream_Utils.o):
warning: could not find referenced DIE
in DIE:
0x0001415e: DW_TAG_imported_declaration [99]
DW_AT_decl_file [DW_FORM_data1]
("/Applications/Xcode7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/sys/_types/_time_t.h")
DW_AT_decl_line [DW_FORM_data2] (20047)
DW_AT_import [DW_FORM_ref4] (cu + 0x4c4f5254 =>
{0x4c4f5254})
How do I go about understanding the error, what caused it and how to solve it?
BTW, the lib size being built is around 350MB. Could there be a size issue
causing this seg fault?
While I'm here, where could I download the full source code of dsymutil? All I
found was links to separate files
(https://opensource.apple.com/source/clang/clang-700.0.72/src/tools/dsymutil/)
Thanks,
Gil Moses.
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