iota_adapter_latest/programmable_transactions/

context.rs

// Copyright (c) Mysten Labs, Inc.
// Modifications Copyright (c) 2026 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

pub use checked::*;

#[iota_macros::with_checked_arithmetic]
mod checked {
    use std::{
        borrow::Borrow,
        cell::RefCell,
        collections::{BTreeMap, BTreeSet, HashMap},
        rc::Rc,
        sync::Arc,
    };

    use indexmap::IndexSet;
    use iota_move_natives::object_runtime::{
        self, LoadedRuntimeObject, ObjectRuntime, RuntimeResults, get_all_uids, max_event_error,
    };
    use iota_protocol_config::ProtocolConfig;
    use iota_sdk_types::{
        Address, Argument, CommandArgumentError, Event, MovePackage, MoveStruct, ObjectData,
        ObjectId, Owner, SharedObjectReference, StructTag, TypeTag,
    };
    use iota_types::{
        balance::Balance,
        base_types::TxContext,
        coin::Coin,
        error::{ExecutionError, ExecutionErrorKind, command_argument_error},
        execution::{ExecutionResults, ExecutionResultsV1},
        iota_sdk_types_conversions::{
            identifier_core_to_sdk, identifier_sdk_to_core, struct_tag_core_to_sdk,
            type_tag_core_to_sdk,
        },
        metrics::LimitsMetrics,
        move_package::{MovePackageExt, derive_package_metadata_id},
        object::{MoveStructExt, Object, ObjectInner},
        storage::DenyListResult,
        transaction::CallArg,
    };
    use move_binary_format::{
        CompiledModule,
        errors::{Location, PartialVMError, VMError, VMResult},
        file_format::{AbilitySet, CodeOffset, FunctionDefinitionIndex, TypeParameterIndex},
    };
    use move_core_types::{
        account_address::AccountAddress, identifier::IdentStr, language_storage::ModuleId,
        vm_status::StatusCode,
    };
    use move_trace_format::format::MoveTraceBuilder;
    use move_vm_runtime::{
        move_vm::MoveVM,
        native_extensions::NativeContextExtensions,
        session::{LoadedFunctionInstantiation, SerializedReturnValues},
    };
    use move_vm_types::loaded_data::runtime_types::Type;
    use tracing::instrument;

    use crate::{
        adapter::new_native_extensions,
        data_store::{
            PackageStore, cached_data_store::CachedPackageStore, iota_data_store::IotaDataStore,
            linkage_view::LinkageView,
        },
        error::convert_vm_error,
        execution_mode::ExecutionMode,
        execution_value::{
            CommandKind, ExecutionState, InputObjectMetadata, InputValue, ObjectContents,
            ObjectValue, RawValueType, ResultValue, SizeBound, TryFromValue, UsageKind, Value,
        },
        gas_charger::GasCharger,
        gas_meter::IotaGasMeter,
        type_resolver::TypeTagResolver,
    };

    /// Maintains all runtime state specific to programmable transactions
    pub struct ExecutionContext<'vm, 'state, 'a> {
        /// The protocol config
        pub protocol_config: &'a ProtocolConfig,
        /// Metrics for reporting exceeded limits
        pub metrics: Arc<LimitsMetrics>,
        /// The MoveVM
        pub vm: &'vm MoveVM,
        /// The LinkageView for this session
        pub linkage_view: LinkageView<'state>,
        pub native_extensions: NativeContextExtensions<'state>,
        /// The global state, used for resolving packages
        pub state_view: &'state dyn ExecutionState,
        /// A shared transaction context, contains transaction digest
        /// information and manages the creation of new object IDs
        pub tx_context: Rc<RefCell<TxContext>>,
        /// The gas charger used for metering
        pub gas_charger: &'a mut GasCharger,
        /// Additional transfers not from the Move runtime
        additional_transfers: Vec<(/* new owner */ Owner, ObjectValue)>,
        /// Newly published packages
        new_packages: Vec<MovePackage>,
        /// User events are claimed after each Move call
        user_events: Vec<(ModuleId, StructTag, Vec<u8>)>,
        // runtime data
        /// The runtime value for the Gas coin, None if it has been taken/moved
        gas: InputValue,
        /// The runtime value for the inputs/call args, None if it has been
        /// taken/moved
        inputs: Vec<InputValue>,
        /// The results of a given command. For most commands, the inner vector
        /// will have length 1. It will only not be 1 for Move calls
        /// with multiple return values. Inner values are None if
        /// taken/moved by-value
        results: Vec<Vec<ResultValue>>,
        /// Map of arguments that are currently borrowed in this command, true
        /// if the borrow is mutable This gets cleared out when new
        /// results are pushed, i.e. the end of a command
        borrowed: HashMap<Arg, /* mut */ bool>,
    }

    /// A write for an object that was generated outside of the Move
    /// ObjectRuntime
    struct AdditionalWrite {
        /// The new owner of the object
        recipient: Owner,
        /// the type of the object,
        type_: Type,
        /// contents of the object
        bytes: Vec<u8>,
    }

    #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
    pub struct Arg(Arg_);

    #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
    enum Arg_ {
        V1(Argument),
        V2(NormalizedArg),
    }

    #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
    enum NormalizedArg {
        GasCoin,
        Input(u16),
        Result(u16, u16),
    }

    impl<'vm, 'state, 'a> ExecutionContext<'vm, 'state, 'a> {
        /// Creates a new instance of the transaction execution context,
        /// initializing the necessary components such as protocol
        /// configuration, Move VM, gas management, inputs, and native
        /// extensions. This function processes the input arguments, sets up gas
        /// handling for the transaction, and prepares the state for
        /// executing Move programs.
        #[instrument(name = "ExecutionContext::new", level = "trace", skip_all)]
        pub fn new(
            protocol_config: &'a ProtocolConfig,
            metrics: Arc<LimitsMetrics>,
            vm: &'vm MoveVM,
            state_view: &'state dyn ExecutionState,
            tx_context: Rc<RefCell<TxContext>>,
            gas_charger: &'a mut GasCharger,
            inputs: Vec<CallArg>,
        ) -> Result<Self, ExecutionError>
        where
            'a: 'state,
        {
            let mut linkage_view = LinkageView::new(Box::new(CachedPackageStore::new(Box::new(
                state_view.as_iota_resolver(),
            ))));
            let mut input_object_map = BTreeMap::new();
            let inputs = inputs
                .into_iter()
                .map(|call_arg| {
                    load_call_arg(
                        vm,
                        state_view,
                        &mut linkage_view,
                        &[],
                        &mut input_object_map,
                        call_arg,
                    )
                })
                .collect::<Result<_, ExecutionError>>()?;
            let gas = if let Some(gas_coin) = gas_charger.gas_coin() {
                let mut gas = load_object(
                    vm,
                    state_view,
                    &mut linkage_view,
                    &[],
                    &mut input_object_map,
                    // imm override
                    false,
                    gas_coin,
                )?;
                // subtract the max gas budget. This amount is off limits in the programmable
                // transaction, so to mimic this "off limits" behavior, we act
                // as if the coin has less balance than it really does
                let Some(Value::Object(ObjectValue {
                    contents: ObjectContents::Coin(coin),
                    ..
                })) = &mut gas.inner.value
                else {
                    invariant_violation!("Gas object should be a populated coin")
                };

                let max_gas_in_balance = gas_charger.gas_budget();
                let Some(new_balance) = coin.balance.value().checked_sub(max_gas_in_balance) else {
                    invariant_violation!(
                        "Transaction input checker should check that there is enough gas"
                    );
                };
                coin.balance = Balance::new(new_balance);
                gas
            } else {
                InputValue {
                    object_metadata: None,
                    inner: ResultValue {
                        last_usage_kind: None,
                        value: None,
                    },
                }
            };
            let native_extensions = new_native_extensions(
                state_view.as_child_resolver(),
                input_object_map,
                !gas_charger.is_unmetered(),
                protocol_config,
                metrics.clone(),
                tx_context.clone(),
                state_view.read_auth_context(),
            );

            // Set the profiler if in CLI
            #[skip_checked_arithmetic]
            move_vm_profiler::tracing_feature_enabled! {
                use move_vm_profiler::GasProfiler;
                use move_vm_types::gas::GasMeter;

                let ref_context: &RefCell<TxContext> = tx_context.borrow();
                let tx_digest = ref_context.borrow().digest();
                let remaining_gas: u64 =
                    move_vm_types::gas::GasMeter::remaining_gas(&IotaGasMeter(gas_charger.move_gas_status_mut()))
                        .into();
                IotaGasMeter(gas_charger.move_gas_status_mut())
                    .set_profiler(GasProfiler::init(
                        &vm.config().profiler_config,
                        format!("{tx_digest}"),
                        remaining_gas,
                    ));
            }

            Ok(Self {
                protocol_config,
                metrics,
                vm,
                linkage_view,
                native_extensions,
                state_view,
                tx_context,
                gas_charger,
                gas,
                inputs,
                results: vec![],
                additional_transfers: vec![],
                new_packages: vec![],
                user_events: vec![],
                borrowed: HashMap::new(),
            })
        }

        pub fn object_runtime(&self) -> Result<&ObjectRuntime<'_>, ExecutionError> {
            self.native_extensions
                .get::<ObjectRuntime>()
                .map_err(|e| self.convert_vm_error(e.finish(Location::Undefined)))
        }

        /// Create a new ID and update the state
        pub fn fresh_id(&mut self) -> Result<ObjectId, ExecutionError> {
            let object_id = self.tx_context.borrow_mut().fresh_id();
            self.record_new_uid(object_id)?;
            Ok(object_id)
        }

        /// Record a newly-created UID in the object runtime.
        pub(crate) fn record_new_uid(&mut self, object_id: ObjectId) -> Result<(), ExecutionError> {
            self.native_extensions
                .get_mut()
                .and_then(|object_runtime: &mut ObjectRuntime| object_runtime.new_id(object_id))
                .map_err(|e| self.convert_vm_error(e.finish(Location::Undefined)))?;
            Ok(())
        }

        /// Create a new ID and update the state
        pub(crate) fn package_derived_metadata_id(
            &mut self,
            package_storage_id: ObjectId,
        ) -> Result<ObjectId, ExecutionError> {
            let object_id = derive_package_metadata_id(package_storage_id);
            self.record_new_uid(object_id)?;
            Ok(object_id)
        }

        /// Delete an ID and update the state
        pub fn delete_id(&mut self, object_id: ObjectId) -> Result<(), ExecutionError> {
            self.native_extensions
                .get_mut()
                .and_then(|object_runtime: &mut ObjectRuntime| object_runtime.delete_id(object_id))
                .map_err(|e| self.convert_vm_error(e.finish(Location::Undefined)))
        }

        /// Set the link context for the session from the linkage information in
        /// the MovePackage found at `package_id`.  Returns the runtime
        /// ID of the link context package on success.
        pub fn set_link_context(
            &mut self,
            package_id: ObjectId,
        ) -> Result<AccountAddress, ExecutionError> {
            if self.linkage_view.has_linkage(package_id)? {
                // Setting same context again, can skip.
                return Ok(self
                    .linkage_view
                    .original_package_id()?
                    .unwrap_or(AccountAddress::new(package_id.into_bytes())));
            }

            let package = package_for_linkage(&self.linkage_view, package_id)
                .map_err(|e| self.convert_vm_error(e))?;

            self.linkage_view.set_linkage(&package)
        }

        /// Load a type using the context's current session.
        pub fn load_type(&mut self, type_tag: &TypeTag) -> VMResult<Type> {
            load_type(self.vm, &self.linkage_view, &self.new_packages, type_tag)
        }

        /// Load a type using the context's current session.
        pub fn load_type_from_struct(&mut self, struct_tag: &StructTag) -> VMResult<Type> {
            load_type_from_struct(self.vm, &self.linkage_view, &self.new_packages, struct_tag)
        }

        pub fn get_type_abilities(&self, t: &Type) -> Result<AbilitySet, ExecutionError> {
            self.vm
                .get_runtime()
                .get_type_abilities(t)
                .map_err(|e| self.convert_vm_error(e))
        }

        /// Takes the user events from the runtime and tags them with the Move
        /// module of the function that was invoked for the command
        pub fn take_user_events(
            &mut self,
            module_id: &ModuleId,
            function: FunctionDefinitionIndex,
            last_offset: CodeOffset,
        ) -> Result<(), ExecutionError> {
            let events = self
                .native_extensions
                .get_mut()
                .map(|object_runtime: &mut ObjectRuntime| object_runtime.take_user_events())
                .map_err(|e| self.convert_vm_error(e.finish(Location::Undefined)))?;
            let num_events = self.user_events.len() + events.len();
            let max_events = self.protocol_config.max_num_event_emit();
            if num_events as u64 > max_events {
                let err = max_event_error(max_events)
                    .at_code_offset(function, last_offset)
                    .finish(Location::Module(module_id.clone()));
                return Err(self.convert_vm_error(err));
            }
            let new_events = events
                .into_iter()
                .map(|(ty, tag, value)| {
                    let layout = self
                        .vm
                        .get_runtime()
                        .type_to_type_layout(&ty)
                        .map_err(|e| self.convert_vm_error(e))?;
                    let Some(bytes) = value.simple_serialize(&layout) else {
                        invariant_violation!("Failed to deserialize already serialized Move value");
                    };
                    Ok((module_id.clone(), struct_tag_core_to_sdk(&tag), bytes))
                })
                .collect::<Result<Vec<_>, ExecutionError>>()?;
            self.user_events.extend(new_events);
            Ok(())
        }

        /// Takes an iterator of arguments and flattens a Result into a
        /// NestedResult if there is more than one result.
        /// However, it is currently gated to 1 result, so this function is in
        /// place for future changes. This is currently blocked by more
        /// invasive work needed to update argument idx in errors
        pub fn splat_args<Items: IntoIterator<Item = Argument>>(
            &self,
            start_idx: usize,
            args: Items,
        ) -> Result<Vec<Arg>, ExecutionError>
        where
            Items::IntoIter: ExactSizeIterator,
        {
            if !self.protocol_config.normalize_ptb_arguments() {
                Ok(args.into_iter().map(|arg| Arg(Arg_::V1(arg))).collect())
            } else {
                let args = args.into_iter();
                let _args_len = args.len();
                let mut res = vec![];
                for (arg_idx, arg) in args.enumerate() {
                    self.splat_arg(&mut res, arg)
                        .map_err(|e| e.into_execution_error(start_idx + arg_idx))?;
                }
                debug_assert_eq!(res.len(), _args_len);
                Ok(res)
            }
        }

        fn splat_arg(&self, res: &mut Vec<Arg>, arg: Argument) -> Result<(), EitherError> {
            match arg {
                Argument::Gas => res.push(Arg(Arg_::V2(NormalizedArg::GasCoin))),
                Argument::Input(i) => {
                    if i as usize >= self.inputs.len() {
                        return Err(CommandArgumentError::IndexOutOfBounds { index: i }.into());
                    }
                    res.push(Arg(Arg_::V2(NormalizedArg::Input(i))))
                }
                Argument::NestedResult(i, j) => {
                    let Some(command_result) = self.results.get(i as usize) else {
                        return Err(CommandArgumentError::IndexOutOfBounds { index: i }.into());
                    };
                    if j as usize >= command_result.len() {
                        return Err(CommandArgumentError::SecondaryIndexOutOfBounds {
                            result: i,
                            subresult: j,
                        }
                        .into());
                    };
                    res.push(Arg(Arg_::V2(NormalizedArg::Result(i, j))))
                }
                Argument::Result(i) => {
                    let Some(result) = self.results.get(i as usize) else {
                        return Err(CommandArgumentError::IndexOutOfBounds { index: i }.into());
                    };
                    let Ok(len): Result<u16, _> = result.len().try_into() else {
                        invariant_violation!("Result of length greater than u16::MAX");
                    };
                    if len != 1 {
                        // TODO protocol config to allow splatting of args
                        return Err(CommandArgumentError::InvalidResultArity { result: i }.into());
                    }
                    res.extend((0..len).map(|j| Arg(Arg_::V2(NormalizedArg::Result(i, j)))))
                }
                _ => {
                    unimplemented!("a new Argument enum variant was added and needs to be handled")
                }
            }
            Ok(())
        }

        pub fn one_arg(
            &self,
            command_arg_idx: usize,
            arg: Argument,
        ) -> Result<Arg, ExecutionError> {
            let args = self.splat_args(command_arg_idx, vec![arg])?;
            let Ok([arg]): Result<[Arg; 1], _> = args.try_into() else {
                return Err(command_argument_error(
                    CommandArgumentError::InvalidArgumentArity,
                    command_arg_idx,
                ));
            };
            Ok(arg)
        }

        /// Registers `bytes` as an additional pure input value and returns the
        /// [`Argument`] referring to it. This lets the adapter feed
        /// synthesized arguments (values not present in the original
        /// transaction inputs) into [`Self::splat_args`] and, in turn, into a
        /// Move call. Pair a run of these calls with [`Self::num_inputs`] /
        /// [`Self::truncate_inputs`] to drop the synthesized inputs afterwards.
        pub(crate) fn add_pure_input(
            &mut self,
            bytes: Vec<u8>,
        ) -> Result<Argument, ExecutionError> {
            let Ok(index) = u16::try_from(self.inputs.len()) else {
                invariant_violation!("too many inputs to register an additional pure input");
            };
            self.inputs
                .push(InputValue::new_raw(RawValueType::Any, bytes));
            Ok(Argument::Input(index))
        }

        /// The current number of registered inputs. Capture this before a run
        /// of [`Self::add_pure_input`] calls and pass it to
        /// [`Self::truncate_inputs`] afterwards to drop the synthesized inputs.
        pub(crate) fn num_inputs(&self) -> usize {
            self.inputs.len()
        }

        /// Drops every input registered at or past `len`, removing the pure
        /// inputs added via [`Self::add_pure_input`] once they are no longer
        /// needed. `len` must come from an earlier [`Self::num_inputs`] call.
        pub(crate) fn truncate_inputs(&mut self, len: usize) {
            self.inputs.truncate(len);
        }

        /// Get the argument value. Cloning the value if it is copyable, and
        /// setting its value to None if it is not (making it
        /// unavailable). Errors if out of bounds, if the argument is
        /// borrowed, if it is unavailable (already taken), or if it is
        /// an object that cannot be taken by value (shared or immutable)
        pub fn by_value_arg<V: TryFromValue>(
            &mut self,
            command_kind: CommandKind,
            arg_idx: usize,
            arg: Arg,
        ) -> Result<V, ExecutionError> {
            self.by_value_arg_(command_kind, arg)
                .map_err(|e| e.into_execution_error(arg_idx))
        }
        fn by_value_arg_<V: TryFromValue>(
            &mut self,
            command_kind: CommandKind,
            arg: Arg,
        ) -> Result<V, EitherError> {
            let is_borrowed = self.arg_is_borrowed(&arg);
            let (input_metadata_opt, val_opt) = self.borrow_mut(arg, UsageKind::ByValue)?;
            let is_copyable = if let Some(val) = val_opt {
                val.is_copyable()
            } else {
                return Err(CommandArgumentError::InvalidValueUsage.into());
            };
            // If it was taken, we catch this above.
            // If it was not copyable and was borrowed, error as it creates a dangling
            // reference in effect.
            // We allow copyable values to be copied out even if borrowed, as we do not care
            // about referential transparency at this level.
            if !is_copyable && is_borrowed {
                return Err(CommandArgumentError::InvalidValueUsage.into());
            }
            // Gas coin cannot be taken by value, except in TransferObjects
            if arg.is_gas_coin() && !matches!(command_kind, CommandKind::TransferObjects) {
                return Err(CommandArgumentError::InvalidGasCoinUsage.into());
            }
            // Immutable objects cannot be taken by value
            if matches!(
                input_metadata_opt,
                Some(InputObjectMetadata::InputObject {
                    owner: Owner::Immutable,
                    ..
                })
            ) {
                return Err(CommandArgumentError::InvalidObjectByValue.into());
            }

            // Any input object taken by value must be mutable
            if matches!(
                input_metadata_opt,
                Some(InputObjectMetadata::InputObject {
                    is_mutable_input: false,
                    ..
                })
            ) {
                return Err(CommandArgumentError::InvalidObjectByValue.into());
            }

            let val = if is_copyable {
                val_opt.as_ref().unwrap().clone()
            } else {
                val_opt.take().unwrap()
            };
            Ok(V::try_from_value(val)?)
        }

        /// Mimic a mutable borrow by taking the argument value, setting its
        /// value to None, making it unavailable. The value will be
        /// marked as borrowed and must be returned with restore_arg
        /// Errors if out of bounds, if the argument is borrowed, if it is
        /// unavailable (already taken), or if it is an object that
        /// cannot be mutably borrowed (immutable)
        pub fn borrow_arg_mut<V: TryFromValue>(
            &mut self,
            arg_idx: usize,
            arg: Arg,
        ) -> Result<V, ExecutionError> {
            self.borrow_arg_mut_(arg)
                .map_err(|e| e.into_execution_error(arg_idx))
        }
        fn borrow_arg_mut_<V: TryFromValue>(&mut self, arg: Arg) -> Result<V, EitherError> {
            // mutable borrowing requires unique usage
            if self.arg_is_borrowed(&arg) {
                return Err(CommandArgumentError::InvalidValueUsage.into());
            }
            self.borrowed.insert(arg, /* is_mut */ true);
            let (input_metadata_opt, val_opt) = self.borrow_mut(arg, UsageKind::BorrowMut)?;
            let is_copyable = if let Some(val) = val_opt {
                val.is_copyable()
            } else {
                // error if taken
                return Err(CommandArgumentError::InvalidValueUsage.into());
            };
            if let Some(InputObjectMetadata::InputObject {
                is_mutable_input: false,
                ..
            }) = input_metadata_opt
            {
                return Err(CommandArgumentError::InvalidObjectByMutRef.into());
            }
            // if it is copyable, don't take it as we allow for the value to be copied even
            // if mutably borrowed
            let val = if is_copyable {
                val_opt.as_ref().unwrap().clone()
            } else {
                val_opt.take().unwrap()
            };
            Ok(V::try_from_value(val)?)
        }

        /// Mimics an immutable borrow by cloning the argument value without
        /// setting its value to None Errors if out of bounds, if the
        /// argument is mutably borrowed, or if it is unavailable
        /// (already taken)
        pub fn borrow_arg<V: TryFromValue>(
            &mut self,
            arg_idx: usize,
            arg: Arg,
            type_: &Type,
        ) -> Result<V, ExecutionError> {
            self.borrow_arg_(arg, type_)
                .map_err(|e| e.into_execution_error(arg_idx))
        }
        fn borrow_arg_<V: TryFromValue>(
            &mut self,
            arg: Arg,
            arg_type: &Type,
        ) -> Result<V, EitherError> {
            // immutable borrowing requires the value was not mutably borrowed.
            // If it was copied, that is okay.
            // If it was taken/moved, we will find out below
            if self.arg_is_mut_borrowed(&arg) {
                return Err(CommandArgumentError::InvalidValueUsage.into());
            }
            self.borrowed.insert(arg, /* is_mut */ false);
            let (_input_metadata_opt, val_opt) = self.borrow_mut(arg, UsageKind::BorrowImm)?;
            if val_opt.is_none() {
                return Err(CommandArgumentError::InvalidValueUsage.into());
            }

            // We eagerly reify receiving argument types at the first usage of them.
            if let &mut Some(Value::Receiving(_, _, ref mut recv_arg_type @ None)) = val_opt {
                let Type::Reference(inner) = arg_type else {
                    return Err(CommandArgumentError::InvalidValueUsage.into());
                };
                *recv_arg_type = Some(*(*inner).clone());
            }

            Ok(V::try_from_value(val_opt.as_ref().unwrap().clone())?)
        }

        /// Restore an argument after being mutably borrowed
        pub fn restore_arg<Mode: ExecutionMode>(
            &mut self,
            updates: &mut Mode::ArgumentUpdates,
            arg: Arg,
            value: Value,
        ) -> Result<(), ExecutionError> {
            Mode::add_argument_update(self, updates, arg.into(), &value)?;
            let was_mut_opt = self.borrowed.remove(&arg);
            assert_invariant!(
                was_mut_opt.is_some() && was_mut_opt.unwrap(),
                "Should never restore a non-mut borrowed value. \
                The take+restore is an implementation detail of mutable references"
            );
            // restore is exclusively used for mut
            let Ok((_, value_opt)) = self.borrow_mut_impl(arg, None) else {
                invariant_violation!("Should be able to borrow argument to restore it")
            };

            let old_value = value_opt.replace(value);
            assert_invariant!(
                old_value.is_none() || old_value.unwrap().is_copyable(),
                "Should never restore a non-taken value, unless it is copyable. \
                The take+restore is an implementation detail of mutable references"
            );

            Ok(())
        }

        /// Transfer the object to a new owner
        pub fn transfer_object(
            &mut self,
            obj: ObjectValue,
            addr: Address,
        ) -> Result<(), ExecutionError> {
            self.additional_transfers.push((Owner::Address(addr), obj));
            Ok(())
        }

        /// Freeze the object
        pub fn freeze_object(&mut self, obj: ObjectValue) -> Result<(), ExecutionError> {
            self.additional_transfers.push((Owner::Immutable, obj));
            Ok(())
        }

        /// Create a new package
        pub fn new_package<'p>(
            &self,
            modules: &[CompiledModule],
            dependencies: impl IntoIterator<Item = &'p MovePackage>,
        ) -> Result<MovePackage, ExecutionError> {
            MovePackage::new_initial(modules, self.protocol_config, dependencies)
        }

        /// Create a package upgrade from `previous_package` with `new_modules`
        /// and `dependencies`
        pub fn upgrade_package<'p>(
            &self,
            storage_id: ObjectId,
            previous_package: &MovePackage,
            new_modules: &[CompiledModule],
            dependencies: impl IntoIterator<Item = &'p MovePackage>,
        ) -> Result<MovePackage, ExecutionError> {
            previous_package.new_upgraded(
                storage_id,
                new_modules,
                self.protocol_config,
                dependencies,
            )
        }

        /// Add a newly created package to write as an effect of the transaction
        pub fn write_package(&mut self, package: MovePackage) {
            self.new_packages.push(package);
        }

        /// Return the last package pushed in `write_package`.
        /// This function should be used in block of codes that push a package,
        /// verify it, run the init and in case of error will remove the
        /// package. The package has to be pushed for the init to run
        /// correctly.
        pub fn pop_package(&mut self) -> Option<MovePackage> {
            self.new_packages.pop()
        }

        /// Finish a command: clearing the borrows and adding the results to the
        /// result vector
        pub fn push_command_results(&mut self, results: Vec<Value>) -> Result<(), ExecutionError> {
            assert_invariant!(
                self.borrowed.values().all(|is_mut| !is_mut),
                "all mut borrows should be restored"
            );
            // clear borrow state
            self.borrowed = HashMap::new();
            self.results
                .push(results.into_iter().map(ResultValue::new).collect());
            Ok(())
        }

        /// Determine the object changes and collect all user events
        pub fn finish<Mode: ExecutionMode>(self) -> Result<ExecutionResults, ExecutionError> {
            let Self {
                protocol_config,
                vm,
                linkage_view,
                mut native_extensions,
                tx_context,
                gas_charger,
                additional_transfers,
                new_packages,
                gas,
                inputs,
                results,
                user_events,
                state_view,
                ..
            } = self;
            let ref_context: &RefCell<TxContext> = tx_context.borrow();
            let tx_digest = ref_context.borrow().digest();

            let gas_id_opt = gas.object_metadata.as_ref().map(|info| info.id());
            let mut loaded_runtime_objects = BTreeMap::new();
            let mut additional_writes = BTreeMap::new();
            let mut by_value_shared_objects = BTreeSet::new();
            for input in inputs.into_iter().chain(std::iter::once(gas)) {
                let InputValue {
                    object_metadata:
                        Some(InputObjectMetadata::InputObject {
                            // We are only interested in mutable inputs.
                            is_mutable_input: true,
                            id,
                            version,
                            owner,
                        }),
                    inner: ResultValue { value, .. },
                } = input
                else {
                    continue;
                };
                loaded_runtime_objects.insert(
                    id,
                    LoadedRuntimeObject {
                        version,
                        is_modified: true,
                    },
                );
                if let Some(Value::Object(object_value)) = value {
                    add_additional_write(&mut additional_writes, owner, object_value)?;
                } else if owner.is_shared() {
                    by_value_shared_objects.insert(id);
                }
            }
            // check for unused values
            // disable this check for dev inspect
            if !Mode::allow_arbitrary_values() {
                for (i, command_result) in results.iter().enumerate() {
                    for (j, result_value) in command_result.iter().enumerate() {
                        let ResultValue {
                            last_usage_kind,
                            value,
                        } = result_value;
                        match value {
                            None => (),
                            Some(Value::Object(_)) => {
                                return Err(ExecutionErrorKind::UnusedValueWithoutDrop {
                                    result: i as u16,
                                    subresult: j as u16,
                                }
                                .into());
                            }
                            Some(Value::Raw(RawValueType::Any, _)) => (),
                            Some(Value::Raw(RawValueType::Loaded { abilities, .. }, _)) => {
                                // - nothing to check for drop
                                // - if it does not have drop, but has copy, the last usage must be
                                //   by value in order to "lie" and say that the last usage is
                                //   actually a take instead of a clone
                                // - Otherwise, an error
                                if abilities.has_drop()
                                    || (abilities.has_copy()
                                        && matches!(last_usage_kind, Some(UsageKind::ByValue)))
                                {
                                } else {
                                    let msg = if abilities.has_copy() {
                                        "The value has copy, but not drop. \
                                        Its last usage must be by-value so it can be taken."
                                    } else {
                                        "Unused value without drop"
                                    };
                                    return Err(ExecutionError::new_with_source(
                                        ExecutionErrorKind::UnusedValueWithoutDrop {
                                            result: i as u16,
                                            subresult: j as u16,
                                        },
                                        msg,
                                    ));
                                }
                            }
                            // Receiving arguments can be dropped without being received
                            Some(Value::Receiving(_, _, _)) => (),
                        }
                    }
                }
            }
            // add transfers from TransferObjects command
            for (owner, object_value) in additional_transfers {
                add_additional_write(&mut additional_writes, owner, object_value)?;
            }
            // Refund unused gas
            if let Some(gas_id) = gas_id_opt {
                refund_max_gas_budget(&mut additional_writes, gas_charger, gas_id)?;
            }

            let object_runtime: ObjectRuntime = native_extensions
                .remove()
                .map_err(|e| convert_vm_error(e.finish(Location::Undefined), vm, &linkage_view))?;

            let RuntimeResults {
                writes,
                user_events: remaining_events,
                loaded_child_objects,
                mut created_object_ids,
                deleted_object_ids,
            } = object_runtime.finish()?;
            assert_invariant!(
                remaining_events.is_empty(),
                "Events should be taken after every Move call"
            );

            loaded_runtime_objects.extend(loaded_child_objects);

            let mut written_objects = BTreeMap::new();
            for package in new_packages {
                let package_obj = Object::new_from_package(package, tx_digest);
                let id = package_obj.id();
                created_object_ids.insert(id);
                written_objects.insert(id, package_obj);
            }
            for (id, additional_write) in additional_writes {
                let AdditionalWrite {
                    recipient,
                    type_,
                    bytes,
                } = additional_write;

                let move_object = {
                    create_written_object::<Mode>(
                        vm,
                        &linkage_view,
                        protocol_config,
                        &loaded_runtime_objects,
                        id,
                        type_,
                        bytes,
                    )?
                };
                let object = Object::new_move(move_object, recipient, tx_digest);
                written_objects.insert(id, object);
                if let Some(loaded) = loaded_runtime_objects.get_mut(&id) {
                    loaded.is_modified = true;
                }
            }

            for (id, (recipient, ty, value)) in writes {
                let layout = vm
                    .get_runtime()
                    .type_to_type_layout(&ty)
                    .map_err(|e| convert_vm_error(e, vm, &linkage_view))?;
                let Some(bytes) = value.simple_serialize(&layout) else {
                    invariant_violation!("Failed to deserialize already serialized Move value");
                };
                let move_object = {
                    create_written_object::<Mode>(
                        vm,
                        &linkage_view,
                        protocol_config,
                        &loaded_runtime_objects,
                        id,
                        ty,
                        bytes,
                    )?
                };
                let object = Object::new_move(move_object, recipient, tx_digest);
                written_objects.insert(id, object);
            }

            let results = finish(
                protocol_config,
                state_view,
                gas_charger,
                &ref_context.borrow(),
                &by_value_shared_objects,
                loaded_runtime_objects,
                written_objects,
                created_object_ids,
                deleted_object_ids,
                user_events,
            );
            results
        }

        /// Convert a VM Error to an execution one
        pub fn convert_vm_error(&self, error: VMError) -> ExecutionError {
            crate::error::convert_vm_error(error, self.vm, &self.linkage_view)
        }

        /// Special case errors for type arguments to Move functions
        pub fn convert_type_argument_error(&self, idx: usize, error: VMError) -> ExecutionError {
            use iota_sdk_types::TypeArgumentError;
            use move_core_types::vm_status::StatusCode;
            match error.major_status() {
                StatusCode::NUMBER_OF_TYPE_ARGUMENTS_MISMATCH => {
                    ExecutionErrorKind::TypeArityMismatch.into()
                }
                StatusCode::TYPE_RESOLUTION_FAILURE => ExecutionErrorKind::TypeArgumentError {
                    type_argument: idx as TypeParameterIndex,
                    kind: TypeArgumentError::TypeNotFound,
                }
                .into(),
                StatusCode::CONSTRAINT_NOT_SATISFIED => ExecutionErrorKind::TypeArgumentError {
                    type_argument: idx as TypeParameterIndex,
                    kind: TypeArgumentError::ConstraintNotSatisfied,
                }
                .into(),
                _ => self.convert_vm_error(error),
            }
        }

        /// Returns true if the value at the argument's location is borrowed,
        /// mutably or immutably
        fn arg_is_borrowed(&self, arg: &Arg) -> bool {
            self.borrowed.contains_key(arg)
        }

        /// Returns true if the value at the argument's location is mutably
        /// borrowed
        fn arg_is_mut_borrowed(&self, arg: &Arg) -> bool {
            matches!(self.borrowed.get(arg), Some(/* mut */ true))
        }

        /// Internal helper to borrow the value for an argument and update the
        /// most recent usage
        fn borrow_mut(
            &mut self,
            arg: Arg,
            usage: UsageKind,
        ) -> Result<(Option<&InputObjectMetadata>, &mut Option<Value>), EitherError> {
            self.borrow_mut_impl(arg, Some(usage))
        }

        /// Internal helper to borrow the value for an argument
        /// Updates the most recent usage if specified
        fn borrow_mut_impl(
            &mut self,
            arg: Arg,
            update_last_usage: Option<UsageKind>,
        ) -> Result<(Option<&InputObjectMetadata>, &mut Option<Value>), EitherError> {
            match arg.0 {
                Arg_::V1(arg) => {
                    assert_invariant!(
                        !self.protocol_config.normalize_ptb_arguments(),
                        "Should not be using v1 args with normalized args"
                    );
                    Ok(self.borrow_mut_impl_v1(arg, update_last_usage)?)
                }
                Arg_::V2(arg) => {
                    assert_invariant!(
                        self.protocol_config.normalize_ptb_arguments(),
                        "Should be using only v2 args with normalized args"
                    );
                    Ok(self.borrow_mut_impl_v2(arg, update_last_usage)?)
                }
            }
        }

        // v1 of borrow_mut_impl
        fn borrow_mut_impl_v1(
            &mut self,
            arg: Argument,
            update_last_usage: Option<UsageKind>,
        ) -> Result<(Option<&InputObjectMetadata>, &mut Option<Value>), CommandArgumentError>
        {
            let (metadata, result_value) = match arg {
                Argument::Gas => (self.gas.object_metadata.as_ref(), &mut self.gas.inner),
                Argument::Input(i) => {
                    let Some(input_value) = self.inputs.get_mut(i as usize) else {
                        return Err(CommandArgumentError::IndexOutOfBounds { index: i });
                    };
                    (input_value.object_metadata.as_ref(), &mut input_value.inner)
                }
                Argument::Result(i) => {
                    let Some(command_result) = self.results.get_mut(i as usize) else {
                        return Err(CommandArgumentError::IndexOutOfBounds { index: i });
                    };
                    if command_result.len() != 1 {
                        return Err(CommandArgumentError::InvalidResultArity { result: i });
                    }
                    (None, &mut command_result[0])
                }
                Argument::NestedResult(i, j) => {
                    let Some(command_result) = self.results.get_mut(i as usize) else {
                        return Err(CommandArgumentError::IndexOutOfBounds { index: i });
                    };
                    let Some(result_value) = command_result.get_mut(j as usize) else {
                        return Err(CommandArgumentError::SecondaryIndexOutOfBounds {
                            result: i,
                            subresult: j,
                        });
                    };
                    (None, result_value)
                }
                _ => {
                    unimplemented!("a new Argument enum variant was added and needs to be handled")
                }
            };
            if let Some(usage) = update_last_usage {
                result_value.last_usage_kind = Some(usage);
            }
            Ok((metadata, &mut result_value.value))
        }

        // v2 of borrow_mut_impl
        fn borrow_mut_impl_v2(
            &mut self,
            arg: NormalizedArg,
            update_last_usage: Option<UsageKind>,
        ) -> Result<(Option<&InputObjectMetadata>, &mut Option<Value>), ExecutionError> {
            let (metadata, result_value) = match arg {
                NormalizedArg::GasCoin => (self.gas.object_metadata.as_ref(), &mut self.gas.inner),
                NormalizedArg::Input(i) => {
                    let input_value = self
                        .inputs
                        .get_mut(i as usize)
                        .ok_or_else(|| make_invariant_violation!("bounds already checked"))?;
                    (input_value.object_metadata.as_ref(), &mut input_value.inner)
                }
                NormalizedArg::Result(i, j) => {
                    let result_value = self
                        .results
                        .get_mut(i as usize)
                        .ok_or_else(|| make_invariant_violation!("bounds already checked"))?
                        .get_mut(j as usize)
                        .ok_or_else(|| make_invariant_violation!("bounds already checked"))?;
                    (None, result_value)
                }
            };
            if let Some(usage) = update_last_usage {
                result_value.last_usage_kind = Some(usage);
            }
            Ok((metadata, &mut result_value.value))
        }

        /// Executes a Move function bypassing visibility checks, allowing the
        /// execution of private or protected functions. This method
        /// sets up the necessary gas status and data store, and then
        /// delegates the execution to the Move VM runtime.
        pub(crate) fn execute_function_bypass_visibility(
            &mut self,
            module: &ModuleId,
            function_name: &IdentStr,
            ty_args: Vec<Type>,
            args: Vec<impl Borrow<[u8]>>,
            tracer: &mut Option<MoveTraceBuilder>,
        ) -> VMResult<SerializedReturnValues> {
            let gas_status = self.gas_charger.move_gas_status_mut();
            let mut data_store = IotaDataStore::new(&self.linkage_view, &self.new_packages);
            self.vm.get_runtime().execute_function_bypass_visibility(
                module,
                function_name,
                ty_args,
                args,
                &mut data_store,
                &mut IotaGasMeter(gas_status),
                &mut self.native_extensions,
                tracer.as_mut(),
            )
        }

        /// Loads a Move function from the specified module with the given type
        /// arguments without executing it. This function initializes
        /// the data store and delegates the loading process to the Move
        /// VM runtime.
        pub(crate) fn load_function(
            &mut self,
            module_id: &ModuleId,
            function_name: &IdentStr,
            type_arguments: &[Type],
        ) -> VMResult<LoadedFunctionInstantiation> {
            let mut data_store = IotaDataStore::new(&self.linkage_view, &self.new_packages);
            self.vm.get_runtime().load_function(
                module_id,
                function_name,
                type_arguments,
                &mut data_store,
            )
        }

        /// Constructs an `ObjectValue` based on the provided Move object type,
        /// transferability, usage context, and byte contents. This
        /// function utilizes the protocol configuration, Move VM, and
        /// linkage view to properly interpret and instantiate the object.
        pub(crate) fn make_object_value(
            &mut self,
            type_: StructTag,
            used_in_non_entry_move_call: bool,
            contents: &[u8],
        ) -> Result<ObjectValue, ExecutionError> {
            make_object_value(
                self.vm,
                &mut self.linkage_view,
                &self.new_packages,
                type_,
                used_in_non_entry_move_call,
                contents,
            )
        }

        /// Publishes a bundle of Move modules to the blockchain under the
        /// specified sender's account address. The function initializes
        /// a data store and delegates the publishing operation to the Move VM
        /// runtime.
        pub fn publish_module_bundle(
            &mut self,
            modules: Vec<Vec<u8>>,
            sender: AccountAddress,
        ) -> VMResult<()> {
            // TODO: publish_module_bundle() currently doesn't charge gas.
            // Do we want to charge there?
            let mut data_store = IotaDataStore::new(&self.linkage_view, &self.new_packages);
            self.vm.get_runtime().publish_module_bundle(
                modules,
                sender,
                &mut data_store,
                &mut IotaGasMeter(self.gas_charger.move_gas_status_mut()),
            )
        }

        pub fn size_bound_raw(&self, bound: u64) -> SizeBound {
            if self.protocol_config.max_ptb_value_size_v2() {
                SizeBound::Raw(bound)
            } else {
                SizeBound::Object(bound)
            }
        }

        pub fn size_bound_vector_elem(&self, bound: u64) -> SizeBound {
            if self.protocol_config.max_ptb_value_size_v2() {
                SizeBound::VectorElem(bound)
            } else {
                SizeBound::Object(bound)
            }
        }
    }

    impl TypeTagResolver for ExecutionContext<'_, '_, '_> {
        /// Retrieves the `TypeTag` corresponding to the provided `Type` by
        /// querying the Move VM runtime.
        fn get_type_tag(&self, type_: &Type) -> Result<TypeTag, ExecutionError> {
            self.vm
                .get_runtime()
                .get_type_tag(type_)
                .map_err(|e| self.convert_vm_error(e))
                .map(|tt| type_tag_core_to_sdk(&tt))
        }
    }

    /// Fetch the package at `package_id` with a view to using it as a link
    /// context.  Produces an error if the object at that ID does not exist,
    /// or is not a package.
    fn package_for_linkage(
        package_store: &dyn PackageStore,
        package_id: ObjectId,
    ) -> VMResult<Rc<MovePackage>> {
        use move_binary_format::errors::PartialVMError;
        use move_core_types::vm_status::StatusCode;

        match package_store.get_package(&package_id) {
            Ok(Some(package)) => Ok(package),
            Ok(None) => Err(PartialVMError::new(StatusCode::LINKER_ERROR)
                .with_message(format!("Cannot find link context {package_id} in store"))
                .finish(Location::Undefined)),
            Err(err) => Err(PartialVMError::new(StatusCode::LINKER_ERROR)
                .with_message(format!(
                    "Error loading link context {package_id} from store: {err}"
                ))
                .finish(Location::Undefined)),
        }
    }

    /// Loads a `Type` from the given `StructTag`, retrieving the corresponding
    /// struct from the package in storage. The function sets up the linkage
    /// context to resolve the struct's module and verifies
    /// any type parameter constraints. If the struct has type parameters, they
    /// are recursively loaded and verified.
    pub fn finish(
        protocol_config: &ProtocolConfig,
        state_view: &dyn ExecutionState,
        gas_charger: &mut GasCharger,
        tx_context: &TxContext,
        by_value_shared_objects: &BTreeSet<ObjectId>,
        loaded_runtime_objects: BTreeMap<ObjectId, LoadedRuntimeObject>,
        written_objects: BTreeMap<ObjectId, Object>,
        created_object_ids: IndexSet<ObjectId>,
        deleted_object_ids: IndexSet<ObjectId>,
        user_events: Vec<(ModuleId, StructTag, Vec<u8>)>,
    ) -> Result<ExecutionResults, ExecutionError> {
        // Before finishing, ensure that any shared object taken by value by the
        // transaction is either:
        // 1. Mutated (and still has a shared ownership); or
        // 2. Deleted.
        // Otherwise, the shared object operation is not allowed and we fail the
        // transaction.
        for id in by_value_shared_objects {
            // If it's been written it must have been reshared so must still have an
            // ownership of `Shared`.
            if let Some(obj) = written_objects.get(id) {
                if !obj.is_shared() {
                    return Err(ExecutionError::new(
                        ExecutionErrorKind::SharedObjectOperationNotAllowed,
                        Some(
                            format!(
                                "Shared object operation on {id} not allowed: \
                                 cannot be frozen, transferred, or wrapped"
                            )
                            .into(),
                        ),
                    ));
                }
            } else {
                // If it's not in the written objects, the object must have been deleted.
                // Otherwise it's an error.
                if !deleted_object_ids.contains(id) {
                    return Err(ExecutionError::new(
                        ExecutionErrorKind::SharedObjectOperationNotAllowed,
                        Some(
                            format!(
                                "Shared object operation on {id} not allowed: \
                                     shared objects used by value must be re-shared if not deleted"
                            )
                            .into(),
                        ),
                    ));
                }
            }
        }

        let DenyListResult {
            result,
            num_non_gas_coin_owners,
        } = state_view.check_coin_deny_list(&written_objects);
        gas_charger.charge_coin_transfers(protocol_config, num_non_gas_coin_owners)?;
        result?;

        let user_events = user_events
            .into_iter()
            .map(|(module_id, tag, contents)| {
                let package_id = ObjectId::new(module_id.address().into_bytes());
                let module = identifier_core_to_sdk(module_id.name());
                let sender = tx_context.sender();
                Event {
                    package_id,
                    module,
                    sender,
                    struct_tag: tag,
                    contents,
                }
            })
            .collect();

        Ok(ExecutionResults::V1(ExecutionResultsV1 {
            written_objects,
            modified_objects: loaded_runtime_objects
                .into_iter()
                .filter_map(|(id, loaded)| loaded.is_modified.then_some(id))
                .collect(),
            created_object_ids: created_object_ids.into_iter().collect(),
            deleted_object_ids: deleted_object_ids.into_iter().collect(),
            user_events,
        }))
    }

    pub fn load_type_from_struct(
        vm: &MoveVM,
        linkage_view: &LinkageView,
        new_packages: &[MovePackage],
        struct_tag: &StructTag,
    ) -> VMResult<Type> {
        fn verification_error<T>(code: StatusCode) -> VMResult<T> {
            Err(PartialVMError::new(code).finish(Location::Undefined))
        }

        // Load the package that the struct is defined in, in storage
        let defining_id = struct_tag.address().into();
        let package = package_for_linkage(linkage_view, defining_id)?;

        // Set the defining package as the link context while loading the
        // struct
        let original_address = linkage_view.set_linkage(&package).map_err(|e| {
            PartialVMError::new(StatusCode::UNKNOWN_INVARIANT_VIOLATION_ERROR)
                .with_message(e.to_string())
                .finish(Location::Undefined)
        })?;

        let runtime_id = ModuleId::new(
            original_address,
            identifier_sdk_to_core(struct_tag.module()),
        );
        let data_store = IotaDataStore::new(linkage_view, new_packages);
        let res = vm.get_runtime().load_type(
            &runtime_id,
            IdentStr::new(struct_tag.name().as_str()).unwrap(),
            &data_store,
        );
        linkage_view.reset_linkage().map_err(|e| {
            PartialVMError::new(StatusCode::UNKNOWN_INVARIANT_VIOLATION_ERROR)
                .with_message(e.to_string())
                .finish(Location::Undefined)
        })?;
        let (idx, struct_type) = res?;

        // Recursively load type parameters, if necessary
        let type_param_constraints = struct_type.type_param_constraints();
        if type_param_constraints.len() != struct_tag.type_params().len() {
            return verification_error(StatusCode::NUMBER_OF_TYPE_ARGUMENTS_MISMATCH);
        }

        if struct_tag.type_params().is_empty() {
            Ok(Type::Datatype(idx))
        } else {
            let loaded_type_params = struct_tag
                .type_params()
                .iter()
                .map(|type_param| load_type(vm, linkage_view, new_packages, type_param))
                .collect::<VMResult<Vec<_>>>()?;

            // Verify that the type parameter constraints on the struct are met
            for (constraint, param) in type_param_constraints.zip(&loaded_type_params) {
                let abilities = vm.get_runtime().get_type_abilities(param)?;
                if !constraint.is_subset(abilities) {
                    return verification_error(StatusCode::CONSTRAINT_NOT_SATISFIED);
                }
            }

            Ok(Type::DatatypeInstantiation(Box::new((
                idx,
                loaded_type_params,
            ))))
        }
    }

    /// Load `type_tag` to get a `Type` in the provided `session`.  `session`'s
    /// linkage context may be reset after this operation, because during
    /// the operation, it may change when loading a struct.
    pub fn load_type(
        vm: &MoveVM,
        linkage_view: &LinkageView,
        new_packages: &[MovePackage],
        type_tag: &TypeTag,
    ) -> VMResult<Type> {
        Ok(match type_tag {
            TypeTag::Bool => Type::Bool,
            TypeTag::U8 => Type::U8,
            TypeTag::U16 => Type::U16,
            TypeTag::U32 => Type::U32,
            TypeTag::U64 => Type::U64,
            TypeTag::U128 => Type::U128,
            TypeTag::U256 => Type::U256,
            TypeTag::Address => Type::Address,
            TypeTag::Signer => Type::Signer,

            TypeTag::Vector(inner) => {
                Type::Vector(Box::new(load_type(vm, linkage_view, new_packages, inner)?))
            }
            TypeTag::Struct(struct_tag) => {
                return load_type_from_struct(vm, linkage_view, new_packages, struct_tag);
            }
        })
    }

    /// Constructs an `ObjectValue` based on the provided `StructTag`,
    /// contents, and additional flags such as transferability and usage
    /// context. If the object is a coin, it deserializes the contents into
    /// a `Coin` type; otherwise, it treats the contents as raw data. The
    /// function then loads the corresponding struct type from the Move
    /// package and verifies its abilities if needed.
    pub(crate) fn make_object_value(
        vm: &MoveVM,
        linkage_view: &mut LinkageView,
        new_packages: &[MovePackage],
        type_: StructTag,
        used_in_non_entry_move_call: bool,
        contents: &[u8],
    ) -> Result<ObjectValue, ExecutionError> {
        let contents = if type_.is_coin() {
            let Ok(coin) = Coin::from_bcs_bytes(contents) else {
                invariant_violation!("Could not deserialize a coin")
            };
            ObjectContents::Coin(coin)
        } else {
            ObjectContents::Raw(contents.to_vec())
        };

        let type_ = load_type_from_struct(vm, linkage_view, new_packages, &type_)
            .map_err(|e| crate::error::convert_vm_error(e, vm, linkage_view))?;
        let abilities = vm
            .get_runtime()
            .get_type_abilities(&type_)
            .map_err(|e| crate::error::convert_vm_error(e, vm, linkage_view))?;
        let has_public_transfer = abilities.has_store();
        Ok(ObjectValue {
            type_,
            has_public_transfer,
            used_in_non_entry_move_call,
            contents,
        })
    }

    impl Arg {
        fn is_gas_coin(&self) -> bool {
            // kept as two separate matches for exhaustiveness
            match self {
                Arg(Arg_::V1(a)) => matches!(a, Argument::Gas),
                Arg(Arg_::V2(n)) => matches!(n, NormalizedArg::GasCoin),
            }
        }
    }

    impl From<Arg> for Argument {
        fn from(arg: Arg) -> Self {
            match arg.0 {
                Arg_::V1(a) => a,
                Arg_::V2(normalized) => match normalized {
                    NormalizedArg::GasCoin => Argument::Gas,
                    NormalizedArg::Input(i) => Argument::Input(i),
                    NormalizedArg::Result(i, j) => Argument::NestedResult(i, j),
                },
            }
        }
    }

    /// Converts a provided `Object` into an `ObjectValue`, extracting and
    /// validating the `StructTag` and contents. This function assumes
    /// the object contains Move-specific data and passes the extracted data
    /// through `make_object_value` to create the corresponding `ObjectValue`.
    pub(crate) fn value_from_object(
        vm: &MoveVM,
        linkage_view: &mut LinkageView,
        new_packages: &[MovePackage],
        object: &Object,
    ) -> Result<ObjectValue, ExecutionError> {
        let ObjectInner {
            data: ObjectData::Struct(object),
            ..
        } = object.as_inner()
        else {
            invariant_violation!("Expected a Move object");
        };

        let used_in_non_entry_move_call = false;
        make_object_value(
            vm,
            linkage_view,
            new_packages,
            object.struct_tag().clone(),
            used_in_non_entry_move_call,
            object.contents(),
        )
    }

    /// Load an input object from the state_view
    fn load_object(
        vm: &MoveVM,
        state_view: &dyn ExecutionState,
        linkage_view: &mut LinkageView,
        new_packages: &[MovePackage],
        input_object_map: &mut BTreeMap<ObjectId, object_runtime::InputObject>,
        override_as_immutable: bool,
        id: ObjectId,
    ) -> Result<InputValue, ExecutionError> {
        let Some(obj) = state_view.read_object(&id) else {
            // protected by transaction input checker
            invariant_violation!("Object {} does not exist yet", id);
        };
        // override_as_immutable ==> Owner::Shared
        assert_invariant!(
            !override_as_immutable || matches!(obj.owner, Owner::Shared(_)),
            "override_as_immutable should only be set for shared objects"
        );
        let is_mutable_input = match obj.owner {
            Owner::Address(_) => true,
            Owner::Shared(_) => !override_as_immutable,
            Owner::Immutable => false,
            Owner::Object(_) => {
                // protected by transaction input checker
                invariant_violation!("Object-owned objects cannot be inputs")
            }
            _ => unimplemented!("a new Owner enum variant was added and needs to be handled"),
        };
        let owner = obj.owner;
        let version = obj.version();
        let object_metadata = InputObjectMetadata::InputObject {
            id,
            is_mutable_input,
            owner,
            version,
        };
        let obj_value = value_from_object(vm, linkage_view, new_packages, obj)?;
        let contained_uids = {
            let fully_annotated_layout = vm
                .get_runtime()
                .type_to_fully_annotated_layout(&obj_value.type_)
                .map_err(|e| convert_vm_error(e, vm, linkage_view))?;
            let mut bytes = vec![];
            obj_value.write_bcs_bytes(&mut bytes, None)?;
            match get_all_uids(&fully_annotated_layout, &bytes) {
                Err(e) => {
                    invariant_violation!("Unable to retrieve UIDs for object. Got error: {e}")
                }
                Ok(uids) => uids,
            }
        };
        let runtime_input = object_runtime::InputObject {
            contained_uids,
            owner,
            version,
        };
        let prev = input_object_map.insert(id, runtime_input);
        // protected by transaction input checker
        assert_invariant!(prev.is_none(), "Duplicate input object {}", id);
        Ok(InputValue::new_object(object_metadata, obj_value))
    }

    /// Load an a CallArg, either an object or a raw set of BCS bytes
    fn load_call_arg(
        vm: &MoveVM,
        state_view: &dyn ExecutionState,
        linkage_view: &mut LinkageView,
        new_packages: &[MovePackage],
        input_object_map: &mut BTreeMap<ObjectId, object_runtime::InputObject>,
        call_arg: CallArg,
    ) -> Result<InputValue, ExecutionError> {
        Ok(match call_arg {
            CallArg::Pure(value) => InputValue::new_raw(RawValueType::Any, value),
            other => load_object_arg(
                vm,
                state_view,
                linkage_view,
                new_packages,
                input_object_map,
                other,
            )?,
        })
    }

    /// Load an object `CallArg` from state view, marking if it can be treated
    /// as mutable or not
    fn load_object_arg(
        vm: &MoveVM,
        state_view: &dyn ExecutionState,
        linkage_view: &mut LinkageView,
        new_packages: &[MovePackage],
        input_object_map: &mut BTreeMap<ObjectId, object_runtime::InputObject>,
        obj_arg: CallArg,
    ) -> Result<InputValue, ExecutionError> {
        match obj_arg {
            CallArg::ImmutableOrOwned(object_ref) => load_object(
                vm,
                state_view,
                linkage_view,
                new_packages,
                input_object_map,
                // imm override
                false,
                object_ref.object_id,
            ),
            CallArg::Shared(SharedObjectReference {
                object_id: id,
                mutable,
                ..
            }) => load_object(
                vm,
                state_view,
                linkage_view,
                new_packages,
                input_object_map,
                // imm override
                !mutable,
                id,
            ),
            CallArg::Receiving(object_ref) => Ok(InputValue::new_receiving_object(
                object_ref.object_id,
                object_ref.version,
            )),
            CallArg::Pure(_) => Err(ExecutionError::invariant_violation(
                "unexpected pure CallArg in load_object_arg",
            )),
            _ => Err(ExecutionError::invariant_violation(
                "a new CallArg enum variant was added and needs to be handled",
            )),
        }
    }

    /// Generate an additional write for an ObjectValue
    fn add_additional_write(
        additional_writes: &mut BTreeMap<ObjectId, AdditionalWrite>,
        owner: Owner,
        object_value: ObjectValue,
    ) -> Result<(), ExecutionError> {
        let ObjectValue {
            type_, contents, ..
        } = object_value;
        let bytes = match contents {
            ObjectContents::Coin(coin) => coin.to_bcs_bytes(),
            ObjectContents::Raw(bytes) => bytes,
        };
        let object_id =
            ObjectId::from_bytes(bytes.get(..ObjectId::LENGTH).ok_or_else(|| {
                ExecutionError::invariant_violation("No id for Raw object bytes")
            })?)
            .expect("ObjectId::LENGTH bytes is always a valid ObjectId");
        let additional_write = AdditionalWrite {
            recipient: owner,
            type_,
            bytes,
        };
        additional_writes.insert(object_id, additional_write);
        Ok(())
    }

    /// The max budget was deducted from the gas coin at the beginning of the
    /// transaction, now we return exactly that amount. Gas will be charged
    /// by the execution engine
    fn refund_max_gas_budget(
        additional_writes: &mut BTreeMap<ObjectId, AdditionalWrite>,
        gas_charger: &mut GasCharger,
        gas_id: ObjectId,
    ) -> Result<(), ExecutionError> {
        let Some(AdditionalWrite { bytes, .. }) = additional_writes.get_mut(&gas_id) else {
            invariant_violation!("Gas object cannot be wrapped or destroyed")
        };
        let Ok(mut coin) = Coin::from_bcs_bytes(bytes) else {
            invariant_violation!("Gas object must be a coin")
        };
        let Some(new_balance) = coin.balance.value().checked_add(gas_charger.gas_budget()) else {
            return Err(ExecutionError::new_with_source(
                ExecutionErrorKind::CoinBalanceOverflow,
                "Gas coin too large after returning the max gas budget",
            ));
        };
        coin.balance = Balance::new(new_balance);
        *bytes = coin.to_bcs_bytes();
        Ok(())
    }

    /// Generate a MoveStruct given an updated/written object
    fn create_written_object<Mode: ExecutionMode>(
        vm: &MoveVM,
        linkage_view: &LinkageView,
        protocol_config: &ProtocolConfig,
        objects_modified_at: &BTreeMap<ObjectId, LoadedRuntimeObject>,
        id: ObjectId,
        type_: Type,
        contents: Vec<u8>,
    ) -> Result<MoveStruct, ExecutionError> {
        debug_assert_eq!(
            id,
            ObjectId::from_bytes(&contents[..ObjectId::LENGTH])
                .expect("object contents should start with an id")
        );
        let old_obj_ver = objects_modified_at
            .get(&id)
            .map(|obj: &LoadedRuntimeObject| obj.version);

        let type_tag = type_tag_core_to_sdk(
            &vm.get_runtime()
                .get_type_tag(&type_)
                .map_err(|e| crate::error::convert_vm_error(e, vm, linkage_view))?,
        );

        let struct_tag = match type_tag {
            TypeTag::Struct(inner) => *inner,
            _ => invariant_violation!("Non struct type for object"),
        };
        MoveStruct::new_from_execution(
            struct_tag,
            old_obj_ver.unwrap_or_default(),
            contents,
            protocol_config,
            Mode::packages_are_predefined(),
        )
    }

    pub enum EitherError {
        CommandArgument(CommandArgumentError),
        Execution(ExecutionError),
    }

    impl From<ExecutionError> for EitherError {
        fn from(e: ExecutionError) -> Self {
            EitherError::Execution(e)
        }
    }

    impl From<CommandArgumentError> for EitherError {
        fn from(e: CommandArgumentError) -> Self {
            EitherError::CommandArgument(e)
        }
    }

    impl EitherError {
        pub fn into_execution_error(self, command_index: usize) -> ExecutionError {
            match self {
                EitherError::CommandArgument(e) => command_argument_error(e, command_index),
                EitherError::Execution(e) => e,
            }
        }
    }
}