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[SMTChecker] Fix soundness of array pop

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This commit is contained in:
Leonardo Alt
2020-08-31 12:11:33 +02:00
parent 98cc1d9994
commit 8c05db88c0
11 changed files with 104 additions and 5 deletions
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libsolidity/formal/SMTEncoder.cpp
+4 -4
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@@ -1111,11 +1111,11 @@ void SMTEncoder::arrayPop(FunctionCall const& _funCall)
symbArray->increaseIndex();
m_context.addAssertion(symbArray->elements() == oldElements);
auto newLength = smtutil::Expression::ite(
oldLength == 0,
smt::maxValue(*TypeProvider::uint256()),
oldLength - 1
oldLength > 0,
oldLength - 1,
0
);
m_context.addAssertion(symbArray->length() == oldLength - 1);
m_context.addAssertion(symbArray->length() == newLength);
arrayPushPopAssign(memberAccess->expression(), symbArray->currentValue());
}