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Hacky for loop implementation.

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This commit is contained in:
chriseth 2022-03-03 20:36:29 +01:00
parent cfc6e02a28
commit 6f7f60903e
2 changed files with 52 additions and 0 deletions
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51
libyul/optimiser/ReasoningBasedSimplifier.cpp
View File

@ -110,6 +110,57 @@ void ReasoningBasedSimplifier::operator()(If& _if)
m_solver->pop();
}
void ReasoningBasedSimplifier::operator()(ForLoop& _for)
{
// TODO handle break / continue
if (!SideEffectsCollector{m_dialect, *_for.condition}.movable())
return;
cout << "Checking if condition can be false" << endl;
smtutil::Expression condition = encodeExpression(*_for.condition);
m_solver->push();
m_solver->addAssertion(condition == constantValue(0));
cout << " running check" << endl;
CheckResult result = m_solver->check({}).first;
m_solver->pop();
if (result == CheckResult::UNSATISFIABLE)
{
cout << " unsat => cannot be false!" << endl;
Literal trueCondition = m_dialect.trueLiteral();
trueCondition.debugData = debugDataOf(*_for.condition);
_for.condition = make_unique<yul::Expression>(move(trueCondition));
}
else
{
cout << "Checking if condition can be true" << endl;
m_solver->push();
m_solver->addAssertion(condition != constantValue(0));
cout << " running check" << endl;
CheckResult result2 = m_solver->check({}).first;
m_solver->pop();
if (result2 == CheckResult::UNSATISFIABLE)
{
cout << " unsat => cannot be true!" << endl;
Literal falseCondition = m_dialect.zeroLiteralForType(m_dialect.boolType);
falseCondition.debugData = debugDataOf(*_for.condition);
_for.condition = make_unique<yul::Expression>(move(falseCondition));
_for.body = yul::Block{};
// Nothing left to be done.
return;
}
}
m_solver->push();
cout << "Setting condition true inside body" << endl;
m_solver->addAssertion(condition != constantValue(0));
ASTModifier::operator()(_for.body);
ASTModifier::operator()(_for.post);
m_solver->pop();
}
ReasoningBasedSimplifier::ReasoningBasedSimplifier(
Dialect const& _dialect,
set<YulString> const& _ssaVariables

1
libyul/optimiser/ReasoningBasedSimplifier.h
View File

@ -57,6 +57,7 @@ public:
using ASTModifier::operator();
void operator()(VariableDeclaration& _varDecl) override;
void operator()(If& _if) override;
void operator()(ForLoop& _for) override;
private:
explicit ReasoningBasedSimplifier(