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<div class="moz-cite-prefix">Hello Raymond,<br>
<br>
1. You can get the Store with ProgramState::getStore() method().<br>
2. To process an SVal representing a region, you may use
SVal::getAsRegion() method. But I'm not sure what you really need
here, could you explain more detailedly?<br>
3. Your approach for FieldRegion will work, but it is better to
search for a FieldDecl in your RecordDecl first and only then get
its FieldRegion. FieldDecl has getName() method allowing doing
this, so your code will look like:<br>
<br>
<p class="MsoNormal" style="margin-left:.5in">for (const auto *F :
structRD->fields()) {<br>
if (<o:p></o:p>F->getName == "fieldName") {<br>
</p>
<p class="MsoNormal" style="margin-left:.5in"> FieldRegion *FR
= MRMgr.getFieldRegion(F, structReg);<br>
</p>
<p class="MsoNormal" style="margin-left:.5in"> size =
State->getSVal(FR);</p>
<p class="MsoNormal" style="margin-left:.5in">}<br>
}<o:p></o:p></p>
<br>
where State is of ProgramStateRef type.<br>
<br>
<br>
09.05.2016 21:55, McDowell, Raymond C. via cfe-dev пишет:<br>
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<p class="MsoNormal">I am new to building Clang static checkers
and need some help. I am implementing a PreCall callback
function that checks calls to a certain family of functions
(from a local library) that takes a struct as an argument. I
see how to get the SVal and Expr for the argument using
CallEvent::getArgSVal() and CallEvent::getArgExpr(). What I’m
struggling with is how to go from the SVal for the struct to
an SVal for one of its fields. In particular, how do I get
the memory region associated with the struct value? Once I
have that, I think I know how to go from there, e.g.:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">RecordType
*structTy =
structReg->getValueType()->getAsStructureType();<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">assert(structTy
&& “Value is not a structure”);<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">RecordDecl
*structRD = structTy ->getDecl()->getDefinition();<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">assert(structRD
&& “structure has no definition”);<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">for (const auto *F
: structRD->fields()) {<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> FieldRegion
*FR = MRMgr.getFieldRegion(F, structReg);<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> if
(FR->getDec()->getName() == “fieldName”)<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> size =
StoreMgr.getBinding(store, loc::MemRegionVal(FR));<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But how do I get the memory region
structReg? And how do I get the Store store?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks!<o:p></o:p></p>
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