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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060">Thanks a lot!
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#002060">J</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060"><o:p> </o:p></span></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""> mehdi.amini@apple.com [mailto:mehdi.amini@apple.com]
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<b>Sent:</b> Monday, November 14, 2016 9:07 PM<br>
<b>To:</b> Alon Shaltiel (ashaltie)<br>
<b>Cc:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [llvm-dev] getting the value back from metadata<o:p></o:p></span></p>
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<p class="MsoNormal">On Nov 14, 2016, at 9:18 AM, Alon Shaltiel (ashaltie) via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-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";color:#002060">Hello,</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:11.0pt;font-family:"Calibri","sans-serif";color:#002060">I’m trying to extract the value out of my MDNode, but for some reason I can’t.</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:11.0pt;font-family:"Calibri","sans-serif";color:#002060"> </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:11.0pt;font-family:"Calibri","sans-serif";color:#002060">For example, if one part of the code gets an MDNode that was created as follows:</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:9.5pt;font-family:Consolas;color:#2B91AF;background:white">Metadata</span><span style="font-size:9.5pt;font-family:Consolas;background:white">* vals[2] =</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:9.5pt;font-family:Consolas;background:white"> {<span class="apple-converted-space"> </span><span style="color:#2B91AF">ValueAsMetadata</span>::get(&<span style="color:gray">F</span>),<span class="apple-converted-space"> </span><span style="color:#2B91AF">ValueAsMetadata</span>::get(<span style="color:#2B91AF">ConstantInt</span>::get(<span style="color:gray">context</span>,
135)) };</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:9.5pt;font-family:Consolas;color:#2B91AF;background:white">MDNode</span><span style="font-size:9.5pt;font-family:Consolas;background:white">* mdnode =<span class="apple-converted-space"> </span><span style="color:#2B91AF">MDNode</span>::get(<span style="color:gray">context</span>,
vals);</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:11.0pt;font-family:"Calibri","sans-serif";color:#002060"> </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:11.0pt;font-family:"Calibri","sans-serif";color:#002060">Is it possible to<span class="apple-converted-space"> </span></span><span style="color:#002060">extract the value of the constant int (135 in this case)?</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="color:#002060"> </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="color:#002060">I tried using MetaDataAsValue as follows:</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:9.5pt;font-family:Consolas;background:white">cast<<span style="color:#2B91AF">ConstantInt</span>>(<span style="color:#2B91AF">MetadataAsValue</span>::get(context,</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:9.5pt;font-family:Consolas;background:white"> mdnode->getOperand(1)))->getZExtValue()</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="color:#002060"> </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="color:#002060"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:#002060">You should try mdconst::extract<ConstantInt> instead of cast<ConstantInt> (search in the codebase for example if needed).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:#002060">— <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#002060">Mehdi<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
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</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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</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="color:#002060">but I get NULL… (although when pronting the MetadataAsValue I do see “<b>i32 135</b>”)</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="color:#002060"> </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="color:#002060">maybe the MDNode should be built in a different manner?</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="color:#002060"> </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="color:#002060">Thanks!</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="color:#002060">Alon</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: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:"Helvetica","sans-serif"">_______________________________________________<br>
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