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For the kind of constraint you specified, <font color="#000000"><a
class="el"
href="http://clang.llvm.org/doxygen/namespaceclang_1_1ento.html#a4e45a121820f0d80d8910093dd33a1df">ProgramStateRef</a>::<a
class="el"
href="http://clang.llvm.org/doxygen/classclang_1_1ento_1_1ProgramState.html#a046c4b1b381d1f5fed26eda3f0646efb">assumeInBound<font
color="#000000">() method may also work well.</font></a></font><br>
<br>
<br>
04.06.2016 20:39, Alexey Sidorin via cfe-dev пишет:<br>
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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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