Module backend

Foundry’s main executor backend abstraction and implementation.

Modules

cow 🔒

A wrapper around Backend that is clone-on-write used for fuzzing.

diagnostic 🔒

error 🔒

in_memory_db 🔒

In-memory database.

snapshot 🔒

Structs

Backend

Provides the underlying revm::Database implementation.

BackendInner

Container type for various Backend related data

BackendStateSnapshot

Represents a state snapshot taken during evm execution

BlockchainDb

A shareable Block database

BlockchainDbMeta

relevant identifying markers in the context of BlockchainDb

CowBackend

A wrapper around Backend that ensures only revm::DatabaseRef functions are called.

EmptyDBWrapper

An empty database that always returns default values when queried.

Fork

Represents a fork

MemDb

In-memory [Database] for Anvil.

SharedBackend

A cloneable backend type that shares access to the backend data with all its clones.

StateSnapshot

A minimal abstraction of a state at a certain point in time

_ObjectSafe 🔒

Enums

BackendDatabaseSnapshot

Variants of a [revm::Database]

BackendError

Errors that can happen when working with [revm::Database]

DatabaseError

Errors that can happen when working with [revm::Database]

RevertDiagnostic

Represents possible diagnostic cases on revert

RevertStateSnapshotAction

What to do when reverting a state snapshot.

Constants

DEFAULT_PERSISTENT_ACCOUNTS 🔒

All accounts that will have persistent storage across fork swaps.

GLOBAL_FAIL_SLOT

bytes32("failed"), as a storage slot key into CHEATCODE_ADDRESS.

Traits

DatabaseExt

An extension trait that allows us to easily extend the revm::Inspector capabilities

Functions

apply_state_changeset 🔒

Applies the changeset of a transaction to the active journaled state and also commits it in the forked db

commit_transaction 🔒

Executes the given transaction and commits state changes to the database and the journaled state, with an inspector.

is_contract_in_state 🔒

Returns true of the address is a contract

merge_account_data 🔒

Clones the data of the given accounts from the active database into the fork_db This includes the data held in storage (CacheDB) and kept in the JournaledState.

merge_db_account_data 🔒

Clones the account data from the active db into the ForkDB

merge_journaled_state_data 🔒

Clones the account data from the active_journaled_state into the fork_journaled_state

update_current_env_with_fork_env 🔒

This updates the currently used env with the fork’s environment

update_env_block 🔒

Updates the env’s block with the block’s data

update_state

Helper method which updates data in the state with the data from the database. Does not change state for persistent accounts (for roll fork to transaction and transact).

Type Aliases

BackendResult

DatabaseResult

Result alias with DatabaseError as error

ForkDB 🔒

ForkLookupIndex 🔒

Represents the index of a fork in the created forks vector This is used for fast lookup

FoundryEvmInMemoryDB

Type alias for an in-memory database.

LocalForkId

Represents a numeric ForkId valid only for the existence of the Backend.