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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">I got it. I hoped that this work was just removed in other library, despite I didn’t find something like that anywhere in lldb. Also I supposed there were
some certain reason to remove it. But since it is just not implemented yet, I have no questions more) Thank you all for explanation!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">Due to complicated instruction formats it is very undesired for me to implement instruction tables again.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">DoGuessValueAt in StackFrame looks like what I need, thanks for this hint!</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> lldb-dev [mailto:lldb-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Sean Callanan via lldb-dev<br>
<b>Sent:</b> Thursday, 31 August, 2017 9:35 PM<br>
<b>To:</b> lldb-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [lldb-dev] Symbolic information in disassembler output<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Greg is right that this was a libedis feature and has no equivalent in LLDB today.<br>
<br>
MCInst, however, doesn't have enough information by itself to do this. The reason is that for many things that are considered "operands," the MCInst has several underlying operands. For example, an operand that was expressed as a register + an offset would
be represented in MCInst as a register operand and in immediate operand, and only correlating the opcode with the LLVM instruction tables (and possibly some special knowledge) would tell you that the two belong together.<br>
<br>
Additionally, libedis could express the semantics of the instruction operands (e.g., "this is a source operand and represents the result of dereferncing rbp - 4") , and inform the client what ranges of characters in the generated string represented each high
level operand. Both of these features are not exposed anywhere at the moment, and in fact the underlying knowledge was lost when the edis TableGen backend was deprecated.<br>
<br>
There are a few LLDB features that reads instructions and attempt to interpret them:<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l0 level1 lfo3">
The fast unwinder looks for specific bit patterns (see UnwindAssembly_x86::GetFastUnwindPlan in UnwindAssembly-x86.cpp);<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l0 level1 lfo3">
The ARM instruction emulator has its own home-grown instruction table (see EmulateInstructionARM64.cpp); and<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l0 level1 lfo3">
The crash diagnose functionality actually parses the output strings from the disassembler (see DoGuessValueAt in StackFrame.cpp).<o:p></o:p></li></ul>
<p class="MsoNormal" style="margin-bottom:12.0pt">Sean<o:p></o:p></p>
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<p class="MsoNormal">On 8/31/17 11:09 AM, Greg Clayton via lldb-dev wrote:<o:p></o:p></p>
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<p class="MsoNormal">I believe libedis was deprecated many years ago and hasn't returned. We use the standard LLVM disassembler, so any features need to be built into llvm::MCInst.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Aug 31, 2017, at 10:42 AM, Tatyana Krasnukha via lldb-dev <<a href="mailto:lldb-dev@lists.llvm.org">lldb-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hello,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">As I understand it, old disassembler (based on libedis) could print symbolic information instead/beside address operand of an instruction. And it looks like there is not such
ability in disassembler now. Is this<span class="apple-converted-space"> </span><span class="text">responsibility shifted on some other component of lldb? Or it was considered as useless and was removed at all?</span><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="text"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="text"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="text"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Tatyana</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Menlo-Regular",serif">_______________________________________________<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>lldb-dev mailing list<o:p></o:p></pre>
<pre><a href="mailto:lldb-dev@lists.llvm.org">lldb-dev@lists.llvm.org</a><o:p></o:p></pre>
<pre><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.llvm.org_cgi-2Dbin_mailman_listinfo_lldb-2Ddev&d=DwMD-g&c=DPL6_X_6JkXFx7AXWqB0tg&r=yfnu24japkhNGh-WqJObHXmH3mINtC_2FO828lrNpM0&m=7vyzoeGsRVHSuFRMjc2lR2qriX_mHH__tvmVgk8GZ2k&s=Vg84RxY-kTR1thZ-fnYnj9AKqhzYs2FclhOLFvamrNg&e=">http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev</a><o:p></o:p></pre>
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