state

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v0.37.4-pr6379 Latest Latest
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 Go to latest Published: Aug 20, 2024 License: AGPL-3.0 Imports: 21 Imported by: 1

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Constants

View Source 
const (
	// AccountsStorageIDKey is the path where we store the collection ID for accounts
	AccountsStorageIDKey = "AccountsStorageIDKey"
	// CodesStorageIDKey is the path where we store the collection ID for codes
	CodesStorageIDKey = "CodesStorageIDKey"
)

Variables

This section is empty.

Functions

func NewPersistentSlabStorage 

func NewPersistentSlabStorage(baseStorage atree.BaseStorage) (*atree.PersistentSlabStorage, error)

Types

type Account 

type Account struct {
	// address
	Address gethCommon.Address
	// balance of the address
	Balance *uint256.Int
	// nonce of the address
	Nonce uint64
	// hash of the code
	// if no code the gethTypes.EmptyCodeHash is stored
	CodeHash gethCommon.Hash
	// the id of the collection holds storage slots for this account
	// this value is nil for EOA accounts
	CollectionID []byte
}

Account holds the metadata of an address and provides (de)serialization functionality

Note that code and storage slots of an address is not part of this data structure

func DecodeAccount 

func DecodeAccount(inp []byte) (*Account, error)

DecodeAccount constructs a new account from the encoded data

func NewAccount 

func NewAccount(
	address gethCommon.Address,
	balance *uint256.Int,
	nonce uint64,
	codeHash gethCommon.Hash,
	collectionID []byte,
) *Account

NewAccount constructs a new account

func (*Account) Encode 

func (a *Account) Encode() ([]byte, error)

Encode encodes the account

func (*Account) HasCode 

func (a *Account) HasCode() bool

type BaseView 

type BaseView struct {
	// contains filtered or unexported fields
}

BaseView implements a types.BaseView it acts as the base layer of state queries for the stateDB it stores accounts, codes and storage slots.

under the hood it uses a set of collections, one for account's meta data, one for codes and one for each of account storage space.

func NewBaseView 

func NewBaseView(ledger atree.Ledger, rootAddress flow.Address) (*BaseView, error)

NewBaseView constructs a new base view

func (*BaseView) AddressInAccessList 

func (v *BaseView) AddressInAccessList(gethCommon.Address) bool

AddressInAccessList checks if an address is in the access list

access list control is not a functionality of the base view it always returns false

func (*BaseView) Commit 

func (v *BaseView) Commit() error

Commit commits the changes to the underlying storage layers

func (*BaseView) CreateAccount 

func (v *BaseView) CreateAccount(
	addr gethCommon.Address,
	balance *uint256.Int,
	nonce uint64,
	code []byte,
	codeHash gethCommon.Hash,
) error

CreateAccount creates a new account

func (*BaseView) DeleteAccount 

func (v *BaseView) DeleteAccount(addr gethCommon.Address) error

DeleteAccount deletes an account's meta data, code, and storage slots associated with that address

func (*BaseView) Exist 

func (v *BaseView) Exist(addr gethCommon.Address) (bool, error)

Exist returns true if the address exist in the state

func (*BaseView) GetBalance 

func (v *BaseView) GetBalance(addr gethCommon.Address) (*uint256.Int, error)

GetBalance returns the balance of an address

for non-existent accounts it returns a balance of zero

func (*BaseView) GetCode 

func (v *BaseView) GetCode(addr gethCommon.Address) ([]byte, error)

GetCode returns the code of an address

for non-existent accounts or accounts without a code (e.g. EOAs) it returns nil

func (*BaseView) GetCodeHash 

func (v *BaseView) GetCodeHash(addr gethCommon.Address) (gethCommon.Hash, error)

GetCodeHash returns the code hash of an address

for non-existent accounts it returns gethCommon.Hash{} and for accounts without a code (e.g. EOAs) it returns default empty hash value (gethTypes.EmptyCodeHash)

func (*BaseView) GetCodeSize 

func (v *BaseView) GetCodeSize(addr gethCommon.Address) (int, error)

GetCodeSize returns the code size of an address

for non-existent accounts or accounts without a code (e.g. EOAs) it returns zero

func (*BaseView) GetNonce 

func (v *BaseView) GetNonce(addr gethCommon.Address) (uint64, error)

GetNonce returns the nonce of an address

for non-existent accounts it returns zero

func (*BaseView) GetRefund 

func (v *BaseView) GetRefund() uint64

GetRefund returns the total amount of (gas) refund

this method returns the value of zero

func (*BaseView) GetState 

func (v *BaseView) GetState(sk types.SlotAddress) (gethCommon.Hash, error)

GetState returns values for a slot in the main storage

for non-existent slots it returns the default empty hash value (gethTypes.EmptyCodeHash)

func (*BaseView) GetStorageRoot added in v0.36.2 

func (v *BaseView) GetStorageRoot(addr common.Address) (common.Hash, error)

GetStorageRoot returns some sort of storage root for the given address WARNING! the root that is returned is not a commitment to the state Mostly is returned to satisfy the requirements of the EVM, where the returned value is compared against empty hash and empty root hash to determine smart contracts that already has data.

Since BaseView doesn't construct a Merkel tree for each account hash of root slab as some sort of root hash. if account doesn't exist we return empty hash if account exist but not a smart contract we return EmptyRootHash if is a contract we return the hash of the root slab content (some sort of commitment).

func (*BaseView) GetTransientState 

func (v *BaseView) GetTransientState(types.SlotAddress) gethCommon.Hash

GetTransientState returns values for an slot transient storage

transient storage is not a functionality for the base view so it always returns the default value for non-existent slots

func (*BaseView) HasSelfDestructed 

func (v *BaseView) HasSelfDestructed(gethCommon.Address) (bool, *uint256.Int)

HasSelfDestructed returns true if an address is flagged for destruction at the end of transaction

func (*BaseView) IsCreated 

func (v *BaseView) IsCreated(gethCommon.Address) bool

IsCreated returns true if the address has been created in the context of this transaction

func (*BaseView) IsNewContract added in v0.36.2 

func (v *BaseView) IsNewContract(gethCommon.Address) bool

IsNewContract returns true if the address is a new contract

func (*BaseView) NumberOfAccounts added in v0.33.30 

func (v *BaseView) NumberOfAccounts() uint64

NumberOfContracts returns the number of accounts

func (*BaseView) NumberOfContracts added in v0.33.30 

func (v *BaseView) NumberOfContracts() uint64

NumberOfContracts returns the number of unique contracts

func (*BaseView) SlotInAccessList 

func (v *BaseView) SlotInAccessList(types.SlotAddress) (addressOk bool, slotOk bool)

SlotInAccessList checks if a slot is in the access list

access list control is not a functionality of the base view it always returns false

func (*BaseView) UpdateAccount 

func (v *BaseView) UpdateAccount(
	addr gethCommon.Address,
	balance *uint256.Int,
	nonce uint64,
	code []byte,
	codeHash gethCommon.Hash,
) error

UpdateAccount updates an account's meta data

func (*BaseView) UpdateSlot 

func (v *BaseView) UpdateSlot(sk types.SlotAddress, value gethCommon.Hash) error

UpdateSlot updates the value for a slot

type ByteStringValue 

type ByteStringValue struct {
	// contains filtered or unexported fields
}

func NewByteStringValue 

func NewByteStringValue(data []byte) ByteStringValue

func (ByteStringValue) ByteSize 

func (v ByteStringValue) ByteSize() uint32

func (ByteStringValue) Bytes 

func (v ByteStringValue) Bytes() []byte

func (ByteStringValue) ChildStorables 

func (v ByteStringValue) ChildStorables() []atree.Storable

func (ByteStringValue) Encode 

func (v ByteStringValue) Encode(enc *atree.Encoder) error

func (ByteStringValue) Storable 

func (v ByteStringValue) Storable(storage atree.SlabStorage, address atree.Address, maxInlineSize uint64) (atree.Storable, error)

func (ByteStringValue) StoredValue 

func (v ByteStringValue) StoredValue(_ atree.SlabStorage) (atree.Value, error)

func (ByteStringValue) String 

func (v ByteStringValue) String() string

type CodeContainer added in v0.33.30 

type CodeContainer struct {
	// contains filtered or unexported fields
}

CodeContainer contains codes and keeps track of reference counts

func CodeContainerFromEncoded added in v0.33.30 

func CodeContainerFromEncoded(encoded []byte) (*CodeContainer, error)

CodeContainerFromEncoded constructs a code container from the encoded data

func NewCodeContainer added in v0.33.30 

func NewCodeContainer(code []byte) *CodeContainer

NewCodeContainer constructs a new code container

func (*CodeContainer) Code added in v0.33.30 

func (cc *CodeContainer) Code() []byte

Code returns the code part of the code container

func (*CodeContainer) DecRefCount added in v0.33.30 

func (cc *CodeContainer) DecRefCount() bool

DecRefCount decrement the ref count and returns true if the ref has reached to zero

func (*CodeContainer) Encode added in v0.33.30 

func (cc *CodeContainer) Encode() []byte

Encoded returns the encoded content of the code container

func (*CodeContainer) IncRefCount added in v0.33.30 

func (cc *CodeContainer) IncRefCount()

IncRefCount increment the ref count

func (*CodeContainer) RefCount added in v0.33.30 

func (cc *CodeContainer) RefCount() uint64

RefCount returns the ref count

type Collection 

type Collection struct {
	// contains filtered or unexported fields
}

Collection provides a persistent and compact way of storing key/value pairs each collection has a unique collectionID that can be used to fetch the collection

TODO(ramtin): we might not need any extra hashing on the atree side and optimize this to just use the key given the keys are hashed ?

func (*Collection) CollectionID 

func (c *Collection) CollectionID() []byte

CollectionID returns the unique id for the collection

func (*Collection) Destroy 

func (c *Collection) Destroy() ([][]byte, error)

Destroy destroys the whole collection

func (*Collection) Get 

func (c *Collection) Get(key []byte) ([]byte, error)

Get gets the value for the given key

if key doesn't exist it returns nil (no error)

func (*Collection) Remove 

func (c *Collection) Remove(key []byte) error

Remove removes a key from the collection

if the key doesn't exist it return no error

func (*Collection) Set 

func (c *Collection) Set(key, value []byte) error

Set sets the value for the given key

if a value already stored at the given key it replaces the value

func (*Collection) Size added in v0.33.30 

func (c *Collection) Size() uint64

Size returns the number of items in the collection

type CollectionProvider 

type CollectionProvider struct {
	// contains filtered or unexported fields
}

CollectionProvider provides access to collections

func NewCollectionProvider 

func NewCollectionProvider(
	rootAddr atree.Address,
	ledger atree.Ledger,
) (*CollectionProvider, error)

NewCollectionProvider constructs a new CollectionProvider

func (*CollectionProvider) CollectionByID 

func (cp *CollectionProvider) CollectionByID(collectionID []byte) (*Collection, error)

CollectionByID returns the collection by collection ID

if no collection is found with that collection id, it return error Warning: this method should only used only once for each collection and the returned pointer should be kept for the future. calling twice for the same collection might result in odd-behaviours currently collection provider doesn't do any internal caching to protect against these cases

func (*CollectionProvider) Commit 

func (cp *CollectionProvider) Commit() error

Commit commits all changes to the collections with changes

func (*CollectionProvider) NewCollection 

func (cp *CollectionProvider) NewCollection() (*Collection, error)

NewCollection constructs a new collection

type DeltaView 

type DeltaView struct {
	// contains filtered or unexported fields
}

DeltaView captures the changes to the state during the execution

for most of the read calls it checks its change logs and if no record is found it would redirect the call to the parent view.

func NewDeltaView 

func NewDeltaView(parent types.ReadOnlyView) *DeltaView

NewDeltaView constructs a new delta view

func (*DeltaView) AddAddressToAccessList 

func (d *DeltaView) AddAddressToAccessList(addr gethCommon.Address) bool

AddAddressToAccessList adds an address to the access list

func (*DeltaView) AddBalance 

func (d *DeltaView) AddBalance(addr gethCommon.Address, amount *uint256.Int) error

AddBalance adds the amount to the current balance of the given address

func (*DeltaView) AddLog 

func (d *DeltaView) AddLog(log *gethTypes.Log)

AddLog appends a log to the log collection

func (*DeltaView) AddPreimage 

func (d *DeltaView) AddPreimage(hash gethCommon.Hash, preimage []byte)

AddPreimage adds a preimage

func (*DeltaView) AddRefund 

func (d *DeltaView) AddRefund(amount uint64) error

AddRefund adds the amount to the total (gas) refund

func (*DeltaView) AddSlotToAccessList 

func (d *DeltaView) AddSlotToAccessList(sk types.SlotAddress) (addrAdded bool, slotAdded bool)

AddSlotToAccessList adds a slot to the access list it also adds the address to the address list

func (*DeltaView) AddressInAccessList 

func (d *DeltaView) AddressInAccessList(addr gethCommon.Address) bool

AddressInAccessList checks if the address is in the access list

func (*DeltaView) CreateAccount 

func (d *DeltaView) CreateAccount(addr gethCommon.Address) error

CreateAccount creates a new account for the given address

if address already exists (even if destructed), carry over the balance and reset the data from the original account.

func (*DeltaView) CreateContract added in v0.36.2 

func (d *DeltaView) CreateContract(addr gethCommon.Address)

CreateContract is used whenever a contract is created. This may be preceded by CreateAccount, but that is not required if it already existed in the state due to funds sent beforehand.

func (*DeltaView) DirtyAddresses 

func (d *DeltaView) DirtyAddresses() map[gethCommon.Address]struct{}

DirtyAddresses returns a set of addresses that has been updated in this view

func (*DeltaView) DirtySlots 

func (d *DeltaView) DirtySlots() map[types.SlotAddress]struct{}

DirtySlots returns a set of slots that has been updated in this view

func (*DeltaView) Exist 

func (d *DeltaView) Exist(addr gethCommon.Address) (bool, error)

Exist returns true if address exists

it also returns true for both newly created accounts or accounts that has been flagged for deletion

func (*DeltaView) GetBalance 

func (d *DeltaView) GetBalance(addr gethCommon.Address) (*uint256.Int, error)

GetBalance returns the balance of the given address

func (*DeltaView) GetCode 

func (d *DeltaView) GetCode(addr gethCommon.Address) ([]byte, error)

GetCode returns the code of the given address

func (*DeltaView) GetCodeHash 

func (d *DeltaView) GetCodeHash(addr gethCommon.Address) (gethCommon.Hash, error)

GetCodeHash returns the code hash of the given address

func (*DeltaView) GetCodeSize 

func (d *DeltaView) GetCodeSize(addr gethCommon.Address) (int, error)

GetCodeSize returns the code size of the given address

func (*DeltaView) GetNonce 

func (d *DeltaView) GetNonce(addr gethCommon.Address) (uint64, error)

GetNonce returns the nonce of the given address

func (*DeltaView) GetRefund 

func (d *DeltaView) GetRefund() uint64

GetRefund returns the total (gas) refund

func (*DeltaView) GetState 

func (d *DeltaView) GetState(sk types.SlotAddress) (gethCommon.Hash, error)

GetState returns the value of the slot of the main state

func (*DeltaView) GetStorageRoot added in v0.36.2 

func (d *DeltaView) GetStorageRoot(addr gethCommon.Address) (gethCommon.Hash, error)

GetStorageRoot returns some sort of storage root for the given address

WARNING! the root that is returned is not a commitment to the state Mostly is returned to satisfy the requirements of the EVM, where the returned value is compared against empty hash and empty root hash values to determine smart contracts that already has data.

Here we return values for non-existing accounts, and redirect the call all the way back to the base view. This means that the state root that is returned ignores the updates to slots during the transaction.

func (*DeltaView) GetTransientState 

func (d *DeltaView) GetTransientState(sk types.SlotAddress) gethCommon.Hash

GetTransientState returns the value of the slot of the transient state

func (*DeltaView) HasSelfDestructed 

func (d *DeltaView) HasSelfDestructed(addr gethCommon.Address) (bool, *uint256.Int)

HasSelfDestructed returns true if address has been flagged for destruction it also returns the balance of the address before the destruction call

func (*DeltaView) IsCreated 

func (d *DeltaView) IsCreated(addr gethCommon.Address) bool

IsCreated returns true if address has been created in this tx

func (*DeltaView) IsNewContract added in v0.36.2 

func (d *DeltaView) IsNewContract(addr gethCommon.Address) bool

IsNewContract returns true if address has been created in this tx. It's used to correctly handle EIP-6780 'delete-in-same-transaction' logic.

func (*DeltaView) Logs 

func (d *DeltaView) Logs() []*gethTypes.Log

Logs returns the logs that has been captured in this view

func (*DeltaView) NewChildView 

func (d *DeltaView) NewChildView() *DeltaView

NewChildView constructs a new delta view having the current view as parent

func (*DeltaView) Preimages 

func (d *DeltaView) Preimages() map[gethCommon.Hash][]byte

Preimages returns a map of preimages

func (*DeltaView) SelfDestruct 

func (d *DeltaView) SelfDestruct(addr gethCommon.Address) error

SelfDestruct sets a flag to destruct the account at the end of transaction

if an account has been created in this transaction, it would return an error

func (*DeltaView) SetCode 

func (d *DeltaView) SetCode(addr gethCommon.Address, code []byte) error

SetCode sets the code for the given address

func (*DeltaView) SetNonce 

func (d *DeltaView) SetNonce(addr gethCommon.Address, nonce uint64) error

SetNonce sets the nonce for the given address

func (*DeltaView) SetState 

func (d *DeltaView) SetState(sk types.SlotAddress, value gethCommon.Hash) error

SetState adds sets a value for the given slot of the main storage

func (*DeltaView) SetTransientState 

func (d *DeltaView) SetTransientState(sk types.SlotAddress, value gethCommon.Hash)

SetTransientState adds sets a value for the given slot of the transient storage

func (*DeltaView) SlotInAccessList 

func (d *DeltaView) SlotInAccessList(sk types.SlotAddress) (addressOk bool, slotOk bool)

SlotInAccessList checks if the slot is in the access list

func (*DeltaView) SubBalance 

func (d *DeltaView) SubBalance(addr gethCommon.Address, amount *uint256.Int) error

SubBalance subtracts the amount from the current balance of the given address

func (*DeltaView) SubRefund 

func (d *DeltaView) SubRefund(amount uint64) error

SubRefund subtracts the amount from the total (gas) refund

type StateDB 

type StateDB struct {
	// contains filtered or unexported fields
}

StateDB implements a types.StateDB interface

stateDB interface defined by the Geth doesn't support returning errors when state calls are happening, and requires stateDB to cache the error and return it at a later time (when commit is called). Only the first error is expected to be returned. Warning: current implementation of the StateDB is considered to be used for a single EVM transaction execution and is not thread safe. yet the current design supports addition of concurrency in the future if needed

func NewStateDB 

func NewStateDB(ledger atree.Ledger, root flow.Address) (*StateDB, error)

NewStateDB constructs a new StateDB

func (*StateDB) AddAddressToAccessList 

func (db *StateDB) AddAddressToAccessList(addr gethCommon.Address)

AddAddressToAccessList adds the given address to the access list.

func (*StateDB) AddBalance 

func (db *StateDB) AddBalance(
	addr gethCommon.Address,
	amount *uint256.Int,
	reason gethTracing.BalanceChangeReason,
)

AddBalance adds the amount from the balance of the given address

func (*StateDB) AddLog 

func (db *StateDB) AddLog(log *gethTypes.Log)

AddLog appends a lot to the collection of logs

func (*StateDB) AddPreimage 

func (db *StateDB) AddPreimage(hash gethCommon.Hash, data []byte)

AddPreimage adds a pre-image to the collection of pre-images

func (*StateDB) AddRefund 

func (db *StateDB) AddRefund(amount uint64)

AddRefund adds the amount to the total (gas) refund

func (*StateDB) AddSlotToAccessList 

func (db *StateDB) AddSlotToAccessList(addr gethCommon.Address, key gethCommon.Hash)

AddSlotToAccessList adds the given (address,slot) to the access list.

func (*StateDB) AddressInAccessList 

func (db *StateDB) AddressInAccessList(addr gethCommon.Address) bool

AddressInAccessList checks if an address is in the access list

func (*StateDB) Commit 

func (db *StateDB) Commit(finalize bool) error

Commit commits state changes back to the underlying

func (*StateDB) CreateAccount 

func (db *StateDB) CreateAccount(addr gethCommon.Address)

CreateAccount creates a new account for the given address it sets the nonce to zero

func (*StateDB) CreateContract added in v0.36.2 

func (db *StateDB) CreateContract(addr gethCommon.Address)

CreateContract is used whenever a contract is created. This may be preceded by CreateAccount, but that is not required if it already existed in the state due to funds sent beforehand. This operation sets the 'newContract'-flag, which is required in order to correctly handle EIP-6780 'delete-in-same-transaction' logic.

func (*StateDB) Empty 

func (db *StateDB) Empty(addr gethCommon.Address) bool

Empty returns whether the given account is empty.

Empty is defined according to EIP161 (balance = nonce = code = 0).

func (*StateDB) Error 

func (s *StateDB) Error() error

Error returns the memorized database failure occurred earlier.

func (*StateDB) Exist 

func (db *StateDB) Exist(addr gethCommon.Address) bool

Exist returns true if the given address exists in state.

this should also return true for self destructed accounts during the transaction execution.

func (*StateDB) Finalize added in v0.33.30 

func (db *StateDB) Finalize() error

Finalize flushes all the changes to the permanent storage

func (*StateDB) GetBalance 

func (db *StateDB) GetBalance(addr gethCommon.Address) *uint256.Int

GetBalance returns the balance of the given address

func (*StateDB) GetCode 

func (db *StateDB) GetCode(addr gethCommon.Address) []byte

GetCode returns the code for the given address

func (*StateDB) GetCodeHash 

func (db *StateDB) GetCodeHash(addr gethCommon.Address) gethCommon.Hash

GetCodeHash returns the code hash of the given address

func (*StateDB) GetCodeSize 

func (db *StateDB) GetCodeSize(addr gethCommon.Address) int

GetCodeSize returns the size of the code for the given address

func (*StateDB) GetCommittedState 

func (db *StateDB) GetCommittedState(addr gethCommon.Address, key gethCommon.Hash) gethCommon.Hash

GetCommittedState returns the value for the given storage slot considering only the committed state and not changes in the scope of current transaction.

func (*StateDB) GetNonce 

func (db *StateDB) GetNonce(addr gethCommon.Address) uint64

GetNonce returns the nonce of the given address

func (*StateDB) GetRefund 

func (db *StateDB) GetRefund() uint64

GetRefund returns the total (gas) refund

func (*StateDB) GetState 

func (db *StateDB) GetState(addr gethCommon.Address, key gethCommon.Hash) gethCommon.Hash

GetState returns the value for the given storage slot

func (*StateDB) GetStorageRoot added in v0.36.2 

func (db *StateDB) GetStorageRoot(addr gethCommon.Address) gethCommon.Hash

GetStorageRoot returns some sort of root for the given address.

Warning! Since StateDB doesn't construct a Merkle tree under the hood, the behavior of this endpoint is as follow: - if an account doesn't exist it returns common.Hash{} - if account is EOA it returns gethCommon.EmptyRootHash - else it returns a unique hash value as the root but this returned

This behavior is ok for this version of EVM as the only use case in the EVM right now is here https://github.com/onflow/go-ethereum/blob/37590b2c5579c36d846c788c70861685b0ea240e/core/vm/evm.go#L480 where the value that is returned is compared to empty values to make sure the storage is empty This endpoint is added mostly to prevent the case that an smart contract is self-destructed and a later transaction tries to deploy a contract to the same address.

func (*StateDB) GetTransientState 

func (db *StateDB) GetTransientState(addr gethCommon.Address, key gethCommon.Hash) gethCommon.Hash

GetTransientState returns the value for the given key of the transient storage

func (*StateDB) HasSelfDestructed 

func (db *StateDB) HasSelfDestructed(addr gethCommon.Address) bool

HasSelfDestructed returns true if address is flagged with self destruct.

func (*StateDB) IsCreated 

func (db *StateDB) IsCreated(addr gethCommon.Address) bool

IsCreated returns true if address is recently created (context of a transaction)

func (*StateDB) IsNewContract added in v0.36.2 

func (db *StateDB) IsNewContract(addr gethCommon.Address) bool

IsCreated returns true if address is a new contract

func (*StateDB) Logs 

func (db *StateDB) Logs(
	blockNumber uint64,
	txHash gethCommon.Hash,
	txIndex uint,
) []*gethTypes.Log

Logs returns the list of logs it also update each log with the block and tx info

func (*StateDB) PointCache added in v0.36.2 

func (s *StateDB) PointCache() *gethUtils.PointCache

PointCache is not supported and only needed when EIP-4762 is enabled in the future versions (currently planned for after Verkle fork).

func (*StateDB) Preimages 

func (db *StateDB) Preimages() map[gethCommon.Hash][]byte

Preimages returns a set of pre-images

func (*StateDB) Prepare 

func (db *StateDB) Prepare(rules gethParams.Rules, sender, coinbase gethCommon.Address, dest *gethCommon.Address, precompiles []gethCommon.Address, txAccesses gethTypes.AccessList)

Prepare is a high level logic that sadly is considered to be part of the stateDB interface and not on the layers above. based on parameters that are passed it updates access-lists

func (*StateDB) Reset added in v0.33.30 

func (db *StateDB) Reset()

Reset resets uncommitted changes and transient artifacts such as error, logs, pre-images, access lists, ... The method is often called between execution of different transactions

func (*StateDB) RevertToSnapshot 

func (db *StateDB) RevertToSnapshot(index int)

RevertToSnapshot reverts the changes until we reach the given snapshot

func (*StateDB) SelfDestruct 

func (db *StateDB) SelfDestruct(addr gethCommon.Address)

SelfDestruct flags the address for deletion.

while this address exists for the rest of transaction, the balance of this account is return zero after the SelfDestruct call.

func (*StateDB) Selfdestruct6780 

func (db *StateDB) Selfdestruct6780(addr gethCommon.Address)

Selfdestruct6780 would only follow the self destruct steps if account is a new contract either just created, or address had balance before but got a contract deployed to it (in this tx).

func (*StateDB) SetCode 

func (db *StateDB) SetCode(addr gethCommon.Address, code []byte)

SetCode sets the code for the given address

func (*StateDB) SetNonce 

func (db *StateDB) SetNonce(addr gethCommon.Address, nonce uint64)

SetNonce sets the nonce value for the given address

func (*StateDB) SetState 

func (db *StateDB) SetState(addr gethCommon.Address, key gethCommon.Hash, value gethCommon.Hash)

SetState sets a value for the given storage slot

func (*StateDB) SetTransientState 

func (db *StateDB) SetTransientState(addr gethCommon.Address, key, value gethCommon.Hash)

SetTransientState sets a value for the given key of the transient storage

func (*StateDB) SlotInAccessList 

func (db *StateDB) SlotInAccessList(addr gethCommon.Address, key gethCommon.Hash) (addressOk bool, slotOk bool)

SlotInAccessList checks if the given (address,slot) is in the access list

func (*StateDB) Snapshot 

func (db *StateDB) Snapshot() int

Snapshot takes an snapshot of the state and returns an int that can be used later for revert calls.

func (*StateDB) SubBalance 

func (db *StateDB) SubBalance(
	addr gethCommon.Address,
	amount *uint256.Int,
	reason gethTracing.BalanceChangeReason,
)

SubBalance substitutes the amount from the balance of the given address

func (*StateDB) SubRefund 

func (db *StateDB) SubRefund(amount uint64)

SubRefund subtracts the amount from the total (gas) refund

func (*StateDB) Witness added in v0.36.2 

func (s *StateDB) Witness() *gethStateless.Witness

Witness is not supported and only needed when if witness collection is enabled (EnableWitnessCollection flag). By definition it should returns a set containing all trie nodes that have been accessed. The returned map could be nil if the witness is empty.

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