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[SMTChecker] Support address type conversion with literals

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This commit is contained in:
Alex Beregszaszi
2020-09-22 18:49:11 +01:00
parent 700cc4c9d3
commit 709d25bd3d
5 changed files with 35 additions and 5 deletions
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libsolidity/formal/SMTEncoder.cpp
+9 -2
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@@ -792,12 +792,19 @@ void SMTEncoder::visitTypeConversion(FunctionCall const& _funCall)
auto argument = _funCall.arguments().front();
unsigned argSize = argument->annotation().type->storageBytes();
unsigned castSize = _funCall.annotation().type->storageBytes();
if (argSize == castSize)
auto const& funCallCategory = _funCall.annotation().type->category();
// Allow casting number literals to address.
// TODO: remove the isNegative() check once the type checker disallows this
if (
auto const* numberType = dynamic_cast<RationalNumberType const*>(argument->annotation().type);
numberType && !numberType->isNegative() && (funCallCategory == Type::Category::Address)
)
defineExpr(_funCall, numberType->literalValue(nullptr));
else if (argSize == castSize)
defineExpr(_funCall, expr(*argument));
else
{
m_context.setUnknownValue(*m_context.expression(_funCall));
auto const& funCallCategory = _funCall.annotation().type->category();
// TODO: truncating and bytesX needs a different approach because of right padding.
if (funCallCategory == Type::Category::Integer || funCallCategory == Type::Category::Address)
{