Method arrayLengthFunction

libsolidity/codegen/YulUtilFunctions.cpp:1317–1357

}

std::string YulUtilFunctions::arrayLengthFunction(ArrayType const& _type)
{
	std::string functionName = "array_length_" + _type.identifier();
	return m_functionCollector.createFunction(functionName, [&]() {
		Whiskers w(R"(
			function <functionName>(value<?dynamic><?calldata>, len</calldata></dynamic>) -> length {
				<?dynamic>
					<?memory>
						length := mload(value)
					</memory>
					<?storage>
						length := sload(value)
						<?byteArray>
							length := <extractByteArrayLength>(length)
						</byteArray>
					</storage>
					<?calldata>
						length := len
					</calldata>
				<!dynamic>
					length := <length>
				</dynamic>
			}
		)");
		w("functionName", functionName);
		w("dynamic", _type.isDynamicallySized());
		if (!_type.isDynamicallySized())
			w("length", toCompactHexWithPrefix(_type.length()));
		w("memory", _type.location() == DataLocation::Memory);
		w("storage", _type.location() == DataLocation::Storage);
		w("calldata", _type.location() == DataLocation::CallData);
		if (_type.location() == DataLocation::Storage)
		{
			w("byteArray", _type.isByteArrayOrString());
			if (_type.isByteArrayOrString())
				w("extractByteArrayLength", extractByteArrayLengthFunction());
		}

		return w.render();
	});
}

std::string YulUtilFunctions::extractByteArrayLengthFunction()
{