Method clearStorageStructFunction

libsolidity/codegen/YulUtilFunctions.cpp:1913–1964

}

std::string YulUtilFunctions::clearStorageStructFunction(StructType const& _type)
{
	solAssert(_type.location() == DataLocation::Storage, "");

	std::string functionName = "clear_struct_storage_" + _type.identifier();

	return m_functionCollector.createFunction(functionName, [&] {
		MemberList::MemberMap structMembers = _type.nativeMembers(nullptr);
		std::vector<std::map<std::string, std::string>> memberSetValues;

		std::set<u256> slotsCleared;
		for (auto const& member: structMembers)
		{
			if (member.type->category() == Type::Category::Mapping)
				continue;
			if (member.type->storageBytes() < 32)
			{
				auto const& slotDiff = _type.storageOffsetsOfMember(member.name).first;
				if (!slotsCleared.count(slotDiff))
				{
					memberSetValues.emplace_back().emplace("clearMember", "sstore(add(slot, " + slotDiff.str() + "), 0)");
					slotsCleared.emplace(slotDiff);
				}
			}
			else
			{
				auto const& [memberSlotDiff, memberStorageOffset] = _type.storageOffsetsOfMember(member.name);
				solAssert(memberStorageOffset == 0, "");

				memberSetValues.emplace_back().emplace("clearMember", Whiskers(R"(
						<setZero>(add(slot, <memberSlotDiff>), <memberStorageOffset>)
					)")
					("setZero", storageSetToZeroFunction(*member.type, VariableDeclaration::Location::Unspecified))
					("memberSlotDiff",  memberSlotDiff.str())
					("memberStorageOffset", std::to_string(memberStorageOffset))
					.render()
				);
			}
		}

		return Whiskers(R"(
			function <functionName>(slot) {
				<#member>
					<clearMember>
				</member>
			}
		)")
		("functionName", functionName)
		("member", memberSetValues)
		.render();
	});
}

std::string YulUtilFunctions::copyArrayToStorageFunction(ArrayType const& _fromType, ArrayType const& _toType)
{