Reference docs:
- https://github.com/Cyfrin/foundry-fund-me-f23/blob/main/script/DeployStorageFun.s.sol
- https://github.com/Cyfrin/foundry-fund-me-f23/blob/main/src/exampleContracts/FunWithStorage.sol
forge inspect StorageSlots storageLayout...
"storage": [
{
"astId": 40940,
"contract": "src/StorageSlots.sol:StorageSlots",
"label": "favoriteNumber",
"offset": 0,
"slot": "0",
"type": "t_uint256"
},
{
"astId": 40942,
"contract": "src/StorageSlots.sol:StorageSlots",
"label": "someBool",
"offset": 0,
"slot": "1",
"type": "t_bool"
},
{
"astId": 40945,
"contract": "src/StorageSlots.sol:StorageSlots",
"label": "myArray",
"offset": 0,
"slot": "2",
"type": "t_array(t_uint256)dyn_storage"
},
{
"astId": 40949,
"contract": "src/StorageSlots.sol:StorageSlots",
"label": "myMap",
"offset": 0,
"slot": "3",
"type": "t_mapping(t_uint256,t_bool)"
}
],
...
Run Anvil
anvilIn a different terminal deploy the script and use cast storage <CONTRACT_ADDRESS> <STORAGE_SLOT> to read the storage slot.
forge script script/DeployStorageSlots.s.sol --rpc-url http://127.0.0.1:8545 --private-key <ANVIL_PRIVATE_KEY_0> --broadcast
cast storage 0x5FbDB2315678afecb367f032d93F642f64180aa3 2forge build
forge script script/DeployStorageSlots.s.sol== Return ==
0: contract StorageSlots 0x90193C961A926261B756D1E5bb255e67ff9498A1
== Logs ==
Value at location 0:
favoriteNumber = 25
0x0000000000000000000000000000000000000000000000000000000000000019
Value at location 1:
someBool = true
0x0000000000000000000000000000000000000000000000000000000000000001
Value at location 2:
Length of myArray = 3
0x0000000000000000000000000000000000000000000000000000000000000003
Value at location 3:
Empty slot for myMap
0x0000000000000000000000000000000000000000000000000000000000000000
Value at location 4:
Empty slot for NOT_IN_STORAGE as it's a constant and not in storage
0x0000000000000000000000000000000000000000000000000000000000000000
Value at location 5:
Empty slot for i_not_in_storage as it's immutable and not in storage
0x0000000000000000000000000000000000000000000000000000000000000000
Array storage slot length:
0x0000000000000000000000000000000000000000000000000000000000000002
First element storage slot:
0x405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5ace
First element in array:
0x000000000000000000000000000000000000000000000000000000000000006f
Storage slot for myMap[0]:
0x3617319a054d772f909f7c479a2cebe5066e836a939412e32403c99029b92eff
Value of myMap[0]:
0x0000000000000000000000000000000000000000000000000000000000000001
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