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<div class="moz-cite-prefix">Hello Raymond,<br>
<br>
As I understand, you need to assume <span
style="font-size:10.0pt;font-family:"Lucida Console"">OffsetIsWithinBounds
</span>later. I suggest you to use another approach. Instead of
making a "logical and", you can try to just "assume" operands of
LAnd sequentially.<br>
<br>
So, the first assume will be for <span
style="font-size:10.0pt;font-family:"Lucida Console"">OffsetIsNonNeg</span>,
and the next is for <span
style="font-size:10.0pt;font-family:"Lucida Console"">OffsetIsWithinSize.<br>
<br>
<br>
</span><br>
04.06.2016 00:54, McDowell, Raymond C. via cfe-dev пишет:<br>
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<p class="MsoNormal">I am trying to construct a constraint that
says 0 <= Offset <= Size, for two SVals Offset and
Size. Here’s what I did:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console""> ASTContext &ACtx =
ChCtx.getASTContext();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console""> SValBuilder &SVBldr =
St->getStateManager().getSValBuilder();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console""> SVal Zero =
SVBldr.makeZeroVal(ACtx.getSizeType());<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console""> SVal OffsetIsNonNeg =
SVBldr.evalBinOpNN(St, BO_LE, Zero.castAs<NonLoc>(),
Offset.castAs<NonLoc>(), ACtx.BoolTy);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console""> SVal OffsetIsWithinSize =
SVBldr.evalBinOpNN(St, BO_LE, Offset.castAs<NonLoc>(),
BuffSize.castAs<NonLoc>(), ACtx.BoolTy);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console""> SVal OffsetIsWithinBounds =
SVBldr.evalBinOpNN(St, BO_LAnd,
OffsetIsNonNeg.castAs<NonLoc>(),
OffsetIsWithinSize.castAs<NonLoc>(), ACtx.BoolTy);<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I run this code, it fails with an
error: Assertion `false && “Invalid Opcode.”’ failed.
This is coming from evalAPSInt in BasicValueFactory.cpp. This
function contains a comment that says “Land, LOr, Comma are
handled specially by higher-level logic.” Land does not seem
to be handled by higher-level logic in this case. I intend to
work around this by asserting these as two separate
constraints instead of combining them into one. But this
looks like a bug to me, so thought I should raise the issue
here.<o:p></o:p></p>
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