Method copyStructToStorageFunction

libsolidity/codegen/YulUtilFunctions.cpp:3762–3874

}

std::string YulUtilFunctions::copyStructToStorageFunction(StructType const& _from, StructType const& _to)
{
	solAssert(_to.dataStoredIn(DataLocation::Storage), "");
	solAssert(_from.structDefinition() == _to.structDefinition(), "");

	std::string functionName =
		"copy_struct_to_storage_from_" +
		_from.identifier() +
		"_to_" +
		_to.identifier();

	return m_functionCollector.createFunction(functionName, [&](auto& _arguments, auto&) {
		_arguments = {"slot", "value"};
		Whiskers templ(R"(
			<?fromStorage> if iszero(eq(slot, value)) { </fromStorage>
			<#member>
			{
				<updateMemberCall>
			}
			</member>
			<?fromStorage> } </fromStorage>
		)");
		templ("fromStorage", _from.dataStoredIn(DataLocation::Storage));

		MemberList::MemberMap structMembers = _from.nativeMembers(nullptr);
		MemberList::MemberMap toStructMembers = _to.nativeMembers(nullptr);

		std::vector<std::map<std::string, std::string>> memberParams(structMembers.size());
		for (size_t i = 0; i < structMembers.size(); ++i)
		{
			Type const& memberType = *structMembers[i].type;
			solAssert(memberType.memoryHeadSize() == 32, "");
			auto const&[slotDiff, offset] = _to.storageOffsetsOfMember(structMembers[i].name);

			Whiskers t(R"(
				let memberSlot := add(slot, <memberStorageSlotDiff>)
				let memberSrcPtr := add(value, <memberOffset>)

				<?fromCalldata>
					let <memberValues> :=
						<?dynamicallyEncodedMember>
							<accessCalldataTail>(value, memberSrcPtr)
						<!dynamicallyEncodedMember>
							memberSrcPtr
						</dynamicallyEncodedMember>

					<?isValueType>
						<memberValues> := <read>(<memberValues>)
					</isValueType>
				</fromCalldata>

				<?fromMemory>
					let <memberValues> := <read>(memberSrcPtr)
				</fromMemory>

				<?fromStorage>
					let <memberValues> :=
						<?isValueType>