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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#0F243E">Hi Jordan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#0F243E">Thanks for your reply.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#0F243E">I think this is achieved using C.generateSink() method where C is CheckerContext, which stops further exploration of the AST path.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#0F243E">In one of the checkers which is a Pre-stmt<BinaryOperator> checker, I have used C.addTransition(); which should not stop the further analysis, but in my
case it stops the further analysis of the AST nodes in same file and only reports the first violation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#0F243E"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New";color:#1F497D">Regards,
</span><span style="font-size:11.0pt;font-family:"Courier New";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New";color:#548DD4">Sujit Kamthe</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><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""> Jordan Rose [mailto:jordan_rose@apple.com]
<br>
<b>Sent:</b> Tuesday, December 11, 2012 10:44 PM<br>
<b>To:</b> Sujit Kamthe<br>
<b>Cc:</b> Clang Developers<br>
<b>Subject:</b> Re: [cfe-dev] Divide by zero reporting<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, Sujit. The checkers in the analyzer can choose to treat errors as fatal or non-fatal. In the case of divide-by-zero errors, we treat them as fatal, because (a) they will in fact trap in most runtimes, and (b) it's hard to continue evaluating
if the division is used in a larger expression:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">int a = 23 / 0;<o:p></o:p></p>
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<p class="MsoNormal">int b = 34 / a; // ??<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Note that the analyzer only stops analyzing a particular <i>
path</i> when it sees a fatal error, not the entire file. Both divide-by-zero violations should be reported in compute(), as well as the one in again(), even if both functions are in the same 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">int compute(int a) {<o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"> </span>if (coin()) {<o:p></o:p></p>
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a = a / 0;<o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"> </span>} else {<o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"> </span>
a = a / 0;<o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"> </span>}<o:p></o:p></p>
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<p class="MsoNormal">}<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">int again() {<o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"> </span>return 24 / 0;<o:p></o:p></p>
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<p class="MsoNormal">}<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">Jordan<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><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 Dec 11, 2012, at 1:36 , Sujit Kamthe <<a href="mailto:Sujit.Kamthe@kpitcummins.com">Sujit.Kamthe@kpitcummins.com</a>> wrote:<o:p></o:p></p>
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<br>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#17365D">Hi,</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:"Trebuchet MS","sans-serif";color:#17365D">While running clang tool on a code it was found that if there are multiple divide by zero violations(more than 1) in same file then only the first one
is reported and rest of them are not reported.</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:"Trebuchet MS","sans-serif";color:#17365D">Even it was found that when a Prestmt<BinaryOperator> check detects/emits a bugreport, it skips the subsequent binary operator nodes from the same file.</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:"Trebuchet MS","sans-serif";color:#17365D"> </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:"Trebuchet MS","sans-serif";color:#17365D">Example Code:</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:"Trebuchet MS","sans-serif";color:#17365D"> </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:"Trebuchet MS","sans-serif";color:#17365D">int a=23/0; //Detected and reported</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:"Trebuchet MS","sans-serif";color:#17365D">int b=34/0; //Not detected</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:"Trebuchet MS","sans-serif";color:#17365D"> </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:8.0pt;font-family:"Courier New";color:#1F497D">Regards,</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"><b><span style="font-size:10.0pt;font-family:"Courier New";color:#548DD4">Sujit Kamthe</span></b><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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