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Zero initialize memory arrays

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This commit is contained in:
Leonardo Alt
2020-04-02 15:55:18 +02:00
parent 8d28089abc
commit 39ff0deb05
22 changed files with 475 additions and 35 deletions
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libsolidity/codegen/ir/IRGeneratorForStatements.cpp
+31 -4
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@@ -154,6 +154,19 @@ void IRGeneratorForStatements::initializeStateVar(VariableDeclaration const& _va
}
}
void IRGeneratorForStatements::initializeLocalVar(VariableDeclaration const& _varDecl)
{
solAssert(m_context.isLocalVariable(_varDecl), "Must be a local variable.");
auto const* type = _varDecl.type();
if (auto const* refType = dynamic_cast<ReferenceType const*>(type))
if (refType->dataStoredIn(DataLocation::Storage) && refType->isPointer())
return;
IRVariable zero = zeroValue(*type);
assign(m_context.localVariable(_varDecl), zero);
}
void IRGeneratorForStatements::endVisit(VariableDeclarationStatement const& _varDeclStatement)
{
if (Expression const* expression = _varDeclStatement.initialValue())
@@ -179,7 +192,10 @@ void IRGeneratorForStatements::endVisit(VariableDeclarationStatement const& _var
else
for (auto const& decl: _varDeclStatement.declarations())
if (decl)
{
declare(m_context.addLocalVariable(*decl));
initializeLocalVar(*decl);
}
}
bool IRGeneratorForStatements::visit(Conditional const& _conditional)
@@ -670,7 +686,7 @@ void IRGeneratorForStatements::endVisit(FunctionCall const& _functionCall)
IRVariable value = convert(*arguments[0], *TypeProvider::uint256());
define(_functionCall) <<
m_utils.allocateMemoryArrayFunction(arrayType) <<
m_utils.allocateAndInitializeMemoryArrayFunction(arrayType) <<
"(" <<
value.commaSeparatedList() <<
")\n";
@@ -1439,6 +1455,12 @@ std::ostream& IRGeneratorForStatements::define(IRVariable const& _var)
return m_code;
}
void IRGeneratorForStatements::declare(IRVariable const& _var)
{
if (_var.type().sizeOnStack() > 0)
m_code << "let " << _var.commaSeparatedList() << "\n";
}
void IRGeneratorForStatements::declareAssign(IRVariable const& _lhs, IRVariable const& _rhs, bool _declare)
{
string output;
@@ -1458,10 +1480,15 @@ void IRGeneratorForStatements::declareAssign(IRVariable const& _lhs, IRVariable
_rhs.commaSeparatedList() <<
")\n";
}
void IRGeneratorForStatements::declare(IRVariable const& _var)
IRVariable IRGeneratorForStatements::zeroValue(Type const& _type, bool _splitFunctionTypes)
{
if (_var.type().sizeOnStack() > 0)
m_code << "let " << _var.commaSeparatedList() << "\n";
IRVariable irVar{
"zero_value_for_type_" + _type.identifier() + m_context.newYulVariable(),
_type
};
define(irVar) << m_utils.zeroValueFunction(_type, _splitFunctionTypes) << "()\n";
return irVar;
}
void IRGeneratorForStatements::appendSimpleUnaryOperation(UnaryOperation const& _operation, Expression const& _expr)