[LLVMbugs] [Bug 3873] New: The check/view/write-graph commands need some Bug repair / Documentation

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3873

           Summary: The check/view/write-graph commands need some Bug repair
                    / Documentation
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: llvmc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rob1weld at aol.com
                CC: llvmbugs at cs.uiuc.edu


# uname -a
Linux debian 2.6.29-rc8-686 #1 SMP Sat Mar 21 06:26:18 UTC 2009 i686 GNU/Linux

# llvmc --version
Low Level Virtual Machine (http://llvm.org/):
  llvm version 2.6svn
  DEBUG build with assertions.
  Built Mar 22 2009(22:49:16).


The Documentation on pages: file:/// */llvm-2.5/docs/CompilerDriver.html or
file:///mnt/drive2/llvm-gcc/install/docs/llvm/html/CompilerDriver.html is
a little short on info about the '-*-graph' commands such as these:

# llvmc --help-hidden | grep graph
  -check-graph           - Check the compilation graph for errors
  -view-graph            - Show compilation graph in GhostView
  -write-graph           - Write compilation-graph.dot file


If I use '-check-graph' it prints nothing (I guess that is supposed
to be good). Since '-check-graph' does not compile and only checks
it might be better to print that everything is OK than to be silent.


If I use '-view-graph' the result is impressive, but the top is a 
little squished and the left edge is cutoff a little. The end result
is a little less than a "Quality graphic" suitable for presentation.


If I use '-write-graph' then 'llvmc' writes a '.dot' file that is
zero bytes long, the correct file is stuck in the /tmp directory.

# llvmc -v --write-graph -o test_delete test_delete.c
Writing '/tmp/llvm_fBIm3t/compilation-graph.dot'...  done. 
debian:/mnt/drive2/llvm-gcc# ls -l compilation-graph.dot
-rw-r--r--  1 root  root        0 2009-03-24 09:57 compilation-graph.dot

# ls -l /tmp/llvm_fBIm3t/compilation-graph.dot
-rw-r--r-- 1 root root 2648 2009-03-24 09:57
/tmp/llvm_fBIm3t/compilation-graph.dot

The 'llvmc' program need to properly copy the temporary files into
the current directory. It names the Graph "unnamed" so you would
need to edit the file manually to combine multiple Graphs.

It would be useful if '-write-graph' command accepted a parameter
for a filename so you could have more than one Graph per directory.
The name used could also apply to the "digraph unnamed {" command
used on the first line of the output.


Thanks,
Rob


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