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Date:      Fri, 16 May 2014 00:49:50 -0400
From:      jhellenthal@dataix.net
To:        hackers@freebsd.org
Subject:   stable/10 r266159 base clang 3.4 Assertion on nul \0
Message-ID:  <20140516044950.GA37592@DataIX.net>
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All,

On powerpc maybe others, I believe I am hitting a bug in clang34 that is part of base. After seearching around it has lead me to (llvm/tools/clang/lib/Frontend/TextDiagnostic.cpp) line 973ish code block where I believe it never checks for the condition of no new line at end of file but I am unfamiliar with the code and could use someone to take a closer look when they have the time.

This is the link that lead me there: (Says resolved so I believe that to be another issue)
http://comments.gmane.org/gmane.comp.compilers.llvm.bugs/24021

This is the error I see repeated through compilation of different programs:
clang -c -I. -I../Src -I../Src -I../Src/Zle -I. -I/usr/local/include -DLIBICONV_PLUG -I/usr/local/include -DHAVE_CONFIG_H -O2 -pipe -DLIBICONV_PLUG -fno-strict-aliasing  -o builtin.o builtin.c
UNREACHABLE executed!
Stack dump:
0.      Program arguments: /usr/bin/clang -cc1 -triple powerpc-unknown-freebsd10.0 -emit-obj -disable-free -disable-llvm-verifier -main-file-name builtin.c -mrelocation-model static -mdisable-fp-elim -relaxed-aliasing -masm-verbose -mconstructor-aliases -target-cpu ppc -coverage-file /export/usr/obj/export/usr/ports/shells/zsh/work/zsh-5.0.5/Src/builtin.o -resource-dir /usr/bin/../lib/clang/3.4 -D LIBICONV_PLUG -D HAVE_CONFIG_H -D LIBICONV_PLUG -I . -I ../Src -I ../Src -I ../Src/Zle -I . -I /usr/local/include -I /usr/local/include -O2 -fdebug-compilation-dir /export/usr/obj/export/usr/ports/shells/zsh/work/zsh-5.0.5/Src -ferror-limit 19 -fmessage-length 94 -mstackrealign -fno-signed-char -fobjc-runtime=gnustep -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o builtin.o -x c builtin.c
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'builtin.c'.
4.      Running pass 'PowerPC DAG->DAG Pattern Instruction Selection' on function '@bin_print'
clang: error: unable to execute command: Abort trap
clang: error: clang frontend command failed due to signal (use -v to see invocation)
FreeBSD clang version 3.4 (tags/RELEASE_34/final 197956) 20140216
Target: powerpc-unknown-freebsd10.0
Thread model: posix


And this is roughly the code block area:
  // Check that a token range does not highlight only whitespace.
  if (R.isTokenRange()) {
    // Pick the first non-whitespace column.
    while (StartColNo < map.getSourceLine().size() &&
           (map.getSourceLine()[StartColNo] == ' ' ||
            map.getSourceLine()[StartColNo] == '\t'))
      StartColNo = map.startOfNextColumn(StartColNo);

    // Pick the last non-whitespace column.
    if (EndColNo > map.getSourceLine().size())
      EndColNo = map.getSourceLine().size();
    while (EndColNo &&
           (map.getSourceLine()[EndColNo-1] == ' ' ||
            map.getSourceLine()[EndColNo-1] == '\t'))
      EndColNo = map.startOfPreviousColumn(EndColNo);

    // If the start/end passed each other, then we are trying to highlight a
    // range that just exists in whitespace, which must be some sort of other
    // bug.
    assert(StartColNo <= EndColNo && "Trying to highlight whitespace??");
  }



Thanks for the Feedback and your time. Patches to test greatly welcomed.


-- 

 - (2^(N-1)) JJH48-ARIN

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