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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">+1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">To make
<span class="SpellE">opt+llc</span> more aligned with the clang driver would be very helpful!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">/Patrik
<span class="SpellE">Hägglund</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman""> llvmdev-bounces@cs.uiuc.edu
[mailto:llvmdev-bounces@cs.uiuc.edu] <b>On Behalf Of </b>Eli Bendersky<br>
<b>Sent:</b> den 11 februari 2014 19:42<br>
<b>To:</b> LLVM Developers Mailing List<br>
<b>Subject:</b> [LLVMdev] Proposal: split tools/opt/opt.cpp to OptTool and a smaller main()<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I started some refactoring work on tools/opt/opt.cpp in r201116, but conceptually this is part of a larger effort. I'd like to consult with llvmdev@ about the best way to move this forward.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Background: opt is a very useful swiss-army-knife tool, and its capabilities may be useful to custom tools. However, as it stands now opt is now very modular - almost all its functionality is contained within its main opt.cpp file.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I think this is also the cause of some code duplication that currently exists between different LLVM tools. For example, some code from opt.cpp is duplicated in llc.cpp; the same is true for the logic of adding optimization passes between
opt.cpp and Clang (a comment in opt.cpp even admits it "duplicates llvm-gcc behaviour", showing its age :-) A lot of cl::opt definitions are duplicated between different tools and have to be kept in sync for consistency.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What I'd like to see is most of opt's functionality moving outside of opt.cpp to make it reusable in other tools. For example, this could be encapsulated in a class named OptTool, or just a namespace with a bunch of utility functions, as
well as cl::opt definitions.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Such a transition can be done in steps: the first step would be to create this OptTool within tools/opt. This would immediately enable building custom opt-based tools by linking in the code from tools/opt, leaving tools/opt/opt.cpp out.
A more ambitious step would be to move the functionality to a library (lib/Tools?) - enabling code reuse between different LLVM tools as well as easier use within custom tools.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Any opinions / suggestions welcome. I'll be happy to send out piecemeal patches that implement this refactoring.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Eli<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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