<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="HU" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">I seek some advice on the following AST scenario.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://godbolt.org/z/WcTeoGcbG">https://godbolt.org/z/WcTeoGcbG</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">1 #include <type_traits><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">2 using std::is_same;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">3 bool top() {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">4 return is_same<char, int>::value || is_same<char, long>::value;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">5 }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The `alpha.core.IdenticalExpr` static analyzer checker warns about that the two `..::value` are identical DeclRefExprs.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">According to the AST, they are indeed identical:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> BinaryOperator <col:10, col:60> 'bool' '||'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> |-ImplicitCastExpr <col:10, col:30> 'bool':'bool' <LValueToRValue><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> | `-DeclRefExpr <col:10, col:30> 'const bool':'const bool' lvalue Var 0x563b67cde0a8 'value' 'const bool':'const bool'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> `-ImplicitCastExpr <col:39, col:60> 'bool':'bool' <LValueToRValue><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> `-DeclRefExpr <col:39, col:60> 'const bool':'const bool' lvalue Var 0x563b67cde0a8 'value' 'const bool':'const bool'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Both of them refers to the same `VarDecl`, corresponding (probably) to the `std::false_type::value`.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">How can I detect that even though the `values` look similar, they correspond to different template instances in that sense?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">What do you suggest?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In the end, I want to suppress these reports in the static analyzer.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Balázs<o:p></o:p></span></p>
</div>
</body>
</html>