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[SMTChecker] Implement support for memory allocation

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This commit is contained in:
Alex Beregszaszi
2020-09-25 15:56:24 +01:00
parent 1cc0d642e8
commit 9f3d5d3e2f
8 changed files with 104 additions and 8 deletions
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libsolidity/formal/SMTEncoder.cpp
+22
View File
@@ -663,6 +663,9 @@ void SMTEncoder::endVisit(FunctionCall const& _funCall)
case FunctionType::Kind::Event:
// These can be safely ignored.
break;
case FunctionType::Kind::ObjectCreation:
visitObjectCreation(_funCall);
return;
default:
m_errorReporter.warning(
4588_error,
@@ -735,6 +738,25 @@ void SMTEncoder::visitGasLeft(FunctionCall const& _funCall)
m_context.addAssertion(symbolicVar->currentValue() <= symbolicVar->valueAtIndex(index - 1));
}
void SMTEncoder::visitObjectCreation(FunctionCall const& _funCall)
{
auto const& args = _funCall.arguments();
solAssert(args.size() >= 1, "");
auto argType = args.front()->annotation().type->category();
solAssert(argType == Type::Category::Integer || argType == Type::Category::RationalNumber, "");
smtutil::Expression arraySize = expr(*args.front());
setSymbolicUnknownValue(arraySize, TypeProvider::uint256(), m_context);
auto symbArray = dynamic_pointer_cast<smt::SymbolicArrayVariable>(m_context.expression(_funCall));
solAssert(symbArray, "");
smt::setSymbolicZeroValue(*symbArray, m_context);
auto zeroElements = symbArray->elements();
symbArray->increaseIndex();
m_context.addAssertion(symbArray->length() == arraySize);
m_context.addAssertion(symbArray->elements() == zeroElements);
}
void SMTEncoder::endVisit(Identifier const& _identifier)
{
if (auto decl = identifierToVariable(_identifier))
libsolidity/formal/SMTEncoder.h
+1
View File
@@ -137,6 +137,7 @@ protected:
void visitAssert(FunctionCall const& _funCall);
void visitRequire(FunctionCall const& _funCall);
void visitGasLeft(FunctionCall const& _funCall);
void visitObjectCreation(FunctionCall const& _funCall);
void visitTypeConversion(FunctionCall const& _funCall);
void visitFunctionIdentifier(Identifier const& _identifier);