Method appendExternalFunctionCall

libsolidity/codegen/ExpressionCompiler.cpp:2732–3029

}

void ExpressionCompiler::appendExternalFunctionCall(
	FunctionType const& _functionType,
	std::vector<ASTPointer<Expression const>> const& _arguments,
	bool _tryCall
)
{
	solAssert(
		_functionType.takesArbitraryParameters() ||
		_arguments.size() == _functionType.parameterTypes().size(), ""
	);

	// Assumed stack content here:
	// <stack top>
	// value [if _functionType.valueSet()]
	// gas [if _functionType.gasSet()]
	// self object [if bound - moved to top right away]
	// function identifier [unless bare]
	// contract address

	unsigned selfSize = _functionType.hasBoundFirstArgument() ? _functionType.selfType()->sizeOnStack() : 0;
	unsigned gasValueSize = (_functionType.gasSet() ? 1u : 0u) + (_functionType.valueSet() ? 1u : 0u);
	unsigned contractStackPos = m_context.currentToBaseStackOffset(1 + gasValueSize + selfSize + (_functionType.isBareCall() ? 0 : 1));
	unsigned gasStackPos = m_context.currentToBaseStackOffset(gasValueSize);
	unsigned valueStackPos = m_context.currentToBaseStackOffset(1);

	// move self object to top
	if (_functionType.hasBoundFirstArgument())
		utils().moveToStackTop(gasValueSize, _functionType.selfType()->sizeOnStack());

	auto funKind = _functionType.kind();

	solAssert(funKind != FunctionType::Kind::BareStaticCall || m_context.evmVersion().hasStaticCall(), "");

	solAssert(funKind != FunctionType::Kind::BareCallCode, "Callcode has been removed.");

	bool returnSuccessConditionAndReturndata = funKind == FunctionType::Kind::BareCall || funKind == FunctionType::Kind::BareDelegateCall || funKind == FunctionType::Kind::BareStaticCall;
	bool isDelegateCall = funKind == FunctionType::Kind::BareDelegateCall || funKind == FunctionType::Kind::DelegateCall;
	bool useStaticCall = funKind == FunctionType::Kind::BareStaticCall || (_functionType.stateMutability() <= StateMutability::View && m_context.evmVersion().hasStaticCall());

	if (_tryCall)
	{
		solAssert(!returnSuccessConditionAndReturndata, "");
		solAssert(!_functionType.isBareCall(), "");
	}

	ReturnInfo const returnInfo{m_context.evmVersion(), _functionType};
	bool const haveReturndatacopy = m_context.evmVersion().supportsReturndata();
	unsigned const retSize = returnInfo.estimatedReturnSize;
	bool const dynamicReturnSize = returnInfo.dynamicReturnSize;
	TypePointers const& returnTypes = returnInfo.returnTypes;

	// Evaluate arguments.
	TypePointers argumentTypes;
	TypePointers parameterTypes = _functionType.parameterTypes();
	if (_functionType.hasBoundFirstArgument())
	{
		argumentTypes.push_back(_functionType.selfType());
		parameterTypes.insert(parameterTypes.begin(), _functionType.selfType());