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Implement checked exponentiation.

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This commit is contained in:
chriseth
2020-08-18 12:42:53 +02:00
parent 660ef792ab
commit c34e349572
9 changed files with 325 additions and 2 deletions
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libsolidity/codegen/ir/IRGeneratorForStatements.cpp
+9 -2
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@@ -277,6 +277,7 @@ bool IRGeneratorForStatements::visit(Assignment const& _assignment)
solAssert(type(_assignment.leftHandSide()).isValueType(), "Compound operators only available for value types.");
solAssert(rightIntermediateType->isValueType(), "Compound operators only available for value types.");
IRVariable leftIntermediate = readFromLValue(*m_currentLValue);
solAssert(binaryOperator != Token::Exp, "");
if (TokenTraits::isShiftOp(binaryOperator))
{
solAssert(type(_assignment) == leftIntermediate.type(), "");
@@ -593,11 +594,17 @@ bool IRGeneratorForStatements::visit(BinaryOperation const& _binOp)
solAssert(false, "Unknown comparison operator.");
define(_binOp) << expr << "\n";
}
else if (TokenTraits::isShiftOp(op))
else if (TokenTraits::isShiftOp(op) || op == Token::Exp)
{
IRVariable left = convert(_binOp.leftExpression(), *commonType);
IRVariable right = convert(_binOp.rightExpression(), *type(_binOp.rightExpression()).mobileType());
define(_binOp) << shiftOperation(_binOp.getOperator(), left, right) << "\n";
if (op == Token::Exp)
define(_binOp) << m_utils.overflowCheckedIntExpFunction(
dynamic_cast<IntegerType const&>(left.type()),
dynamic_cast<IntegerType const&>(right.type())
) << "(" << left.name() << ", " << right.name() << ")\n";
else
define(_binOp) << shiftOperation(_binOp.getOperator(), left, right) << "\n";
}
else
{