forge debug
NAME
forge-debug - Debug a single smart contract as a script.
SYNOPSIS
forge debug [options] path [args…]
DESCRIPTION
Debugs a single smart contract located in the source file (path) as a script.
If multiple contracts are in the specified source file, you must pass --target-contract to specify
what contract you want to run.
Calls
After the script is deployed to the internal EVM a call is made to a function with the signature setUp(), if present.
By default, the script is assumed to be contained in a function with the signature run(). If you wish to
run a different function, pass --sig <SIGNATURE>.
The signature can be a fragment (<function name>(<types>)), or raw calldata.
If you pass a fragment, and the function has parameters, you can add the call parameters to the end of the command (args).
Forking
It is possible to run the script in a forked environment by passing --fork-url <URL>.
When the script is running in a forked environment, you can access all the state of the forked chain as you would if you had deployed the script. Cheatcodes are still available.
You can also specify a block number to fork from by passing --fork-block-number <BLOCK>. When forking from a
specific block, the chain data is cached to ~/.foundry/cache. If you do not want to cache the chain data,
pass --no-storage-caching.
Debugging
It is possible to run the script in an interactive debugger. To start the debugger, pass --debug.
More information on the debugger can be found in the debugger chapter.
OPTIONS
Debug Options
--target-contract contract_name
The name of the contract you want to run
-s signature
--sig signature
The signature of the function you want to call in the contract, or raw calldata. Default: run()
--debug
Open the script in the debugger.
EVM Options
-f url
--rpc-url url
--fork-url url
Fetch state over a remote endpoint instead of starting from an empty state.
If you want to fetch state from a specific block number, see
--fork-block-number.
--fork-block-number block
Fetch state from a specific block number over a remote endpoint. See --fork-url.
--fork-retry-backoff <BACKOFF>
Initial retry backoff on encountering errors.
--no-storage-caching
Explicitly disables the use of RPC caching.
All storage slots are read entirely from the endpoint. See --fork-url.
-v
--verbosity
Verbosity of the EVM.
Pass multiple times to increase the verbosity (e.g. -v, -vv, -vvv).
Verbosity levels:
- 2: Print logs for all tests
- 3: Print execution traces for failing tests
- 4: Print execution traces for all tests, and setup traces for failing tests
- 5: Print execution and setup traces for all tests
--sender address
The address which will be executing tests
--initial-balance balance
The initial balance of deployed contracts
--ffi
Enables the FFI cheatcode
Executor Options
--base-fee <FEE>
--block-base-fee-per-gas <FEE>
The base fee in a block (in wei).
--block-coinbase address
The coinbase of the block.
--block-difficulty difficulty
The block difficulty.
--block-gas-limit gas_limit
The block gas limit.
--block-number block
The block number.
--block-timestamp timestamp
The timestamp of the block (in seconds).
--chain-id chain_id
The chain ID.
--gas-limit gas_limit
The block gas limit.
--gas-price gas_price
The gas price (in wei).
--tx-origin address
The transaction origin.
Cache Options
--force
Clear the cache and artifacts folder and recompile.
Linker Options
--libraries libraries
Set pre-linked libraries.
The parameter must be in the format <remapped path to lib>:<library name>:<address>, e.g. src/Contract.sol:Library:0x....
Can also be set in your configuration file as libraries = ["<path>:<lib name>:<address>"].
Compiler Options
--optimize
Activate the Solidity optimizer.
--optimizer-runs runs
The number of optimizer runs.
--via-ir
Use the Yul intermediate representation compilation pipeline.
--revert-strings
How to treat revert and require reason strings.
--use solc_version
Specify the solc version, or a path to a local solc, to build with.
Valid values are in the format x.y.z, solc:x.y.z or path/to/solc.
--offline
Do not access the network. Missing solc versions will not be installed.
--no-auto-detect
Do not auto-detect solc.
--ignored-error-codes error_codes
Ignore solc warnings by error code. The parameter is a comma-separated list of error codes.
--extra-output selector
Extra output to include in the contract's artifact.
Example keys: abi, storageLayout, evm.assembly, ewasm, ir, ir-optimized, metadata.
For a full description, see the Solidity docs.
--extra-output-files selector
Extra output to write to separate files.
Example keys: abi, storageLayout, evm.assembly, ewasm, ir, ir-optimized, metadata.
For a full description, see the Solidity docs.
--evm-version version
The target EVM version.
Project Options
--build-info
Generate build info files.
--build-info-path path
Output path to directory that build info files will be written to.
--root path
The project's root path. By default, this is the root directory of the current git repository, or the current working directory.
-C path
--contracts path
The contracts source directory.
Environment: DAPP_SRC
--lib-paths path
The path to the library folder.
-R remappings
--remappings remappings
The project's remappings.
The parameter is a comma-separated list of remappings in the format <source>=<dest>.
--cache-path path
The path to the compiler cache.
--config-path file
Path to the config file.
--hh
--hardhat
This is a convenience flag, and is the same as passing --contracts contracts --lib-paths node-modules.
-o path
--out path
The project's artifacts directory.
--silent
Suppress all output.
Common Options
-h
--help
Prints help information.
EXAMPLES
-
Execute the
run()function in a contract:forge debug src/Contract.sol -
Open a script in the debugger:
forge debug src/Contract.sol --debug -
Execute the
foo()function in a contract:forge debug src/Contract.sol --sig "foo()" -
Execute a contract with a function that takes parameters:
forge debug src/Contract.sol --sig "foo(string,uint256)" "hello" 100 -
Execute a contract with raw calldata:
forge debug src/Contract.sol --sig "0x..."