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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We preserve the source line/column for two reasons. First, so that any compiler diagnostic messages can point to a source location that caused the diagnostic;
second, because debugging information in the final binary wants to be able to map machine instruction addresses back to source locations. There is never any need for the end-user to map machine instruction addresses back to IR instructions, so we don't maintain
any information that could produce such a mapping.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--paulr<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> llvm-dev [mailto:llvm-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Muhui Jiang via llvm-dev<br>
<b>Sent:</b> Wednesday, June 13, 2018 3:09 AM<br>
<b>To:</b> mayuyu.io<br>
<b>Cc:</b> llvm-dev<br>
<b>Subject:</b> Re: [llvm-dev] IR to binary address mapping<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">However, frontend may also do various operations on the source code and one line number and column number could map to more than one binary address. Why LLVM IR cannot?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regrads<o:p></o:p></p>
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<p class="MsoNormal">Muhui<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">2018-06-12 23:18 GMT+08:00 <a href="http://mayuyu.io">mayuyu.io</a> <<a href="mailto:admin@mayuyu.io" target="_blank">admin@mayuyu.io</a>>:<o:p></o:p></p>
<p class="MsoNormal">In theory that’s not exactly possible/accurate. Due to various operations in the Backend like Instruction Legalization, one IR instruction might got emitted into multiple assembly instruction, for example<br>
<br>
Zhang<o:p></o:p></p>
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<p class="MsoNormal"><br>
> <span style="font-family:"MS Gothic"">在</span> 2018<span style="font-family:"MS Gothic"">年</span>6<span style="font-family:"MS Gothic"">月</span>12<span style="font-family:"MS Gothic"">日，</span>22:30<span style="font-family:"MS Gothic"">，</span>Muhui Jiang
via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>>
<span style="font-family:"MS Gothic"">写道：</span><br>
> <br>
> Hi<br>
> <br>
> I know that LLVM provide some debug API for us to know the source code information. For example, every IR instruction's source line number and column number.
<br>
> <br>
> However, are there any method to get a mapping from IR instruction to binary address directly. I don't want to use dwarf line mapping table as a bridge. I think the binary is generated by clang and llvm. I think there definitely is some information about
the mapping relationship between LLVM IR and the target binary address. Do anyone has suggestions? Many Thanks<br>
> <br>
> Regards<br>
> Muhui<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">> _______________________________________________<br>
> LLVM Developers mailing list<br>
> <a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a><br>
> <a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" target="_blank">
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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