bal-layout 0.4.0

solc storageLayout -> slots and typed values. Knows nothing about storage backends.
Documentation 
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{
 "storage": [
  {
   "astId": 4,
   "contract": "src/Playground.sol:Playground",
   "label": "counter",
   "offset": 0,
   "slot": "0",
   "type": "t_uint256"
  },
  {
   "astId": 6,
   "contract": "src/Playground.sol:Playground",
   "label": "a",
   "offset": 0,
   "slot": "1",
   "type": "t_uint128"
  },
  {
   "astId": 8,
   "contract": "src/Playground.sol:Playground",
   "label": "b",
   "offset": 16,
   "slot": "1",
   "type": "t_uint64"
  },
  {
   "astId": 10,
   "contract": "src/Playground.sol:Playground",
   "label": "c",
   "offset": 24,
   "slot": "1",
   "type": "t_bool"
  },
  {
   "astId": 18,
   "contract": "src/Playground.sol:Playground",
   "label": "totals",
   "offset": 0,
   "slot": "2",
   "type": "t_struct(Totals)15_storage"
  },
  {
   "astId": 22,
   "contract": "src/Playground.sol:Playground",
   "label": "balances",
   "offset": 0,
   "slot": "3",
   "type": "t_mapping(t_address,t_uint256)"
  },
  {
   "astId": 28,
   "contract": "src/Playground.sol:Playground",
   "label": "nested",
   "offset": 0,
   "slot": "4",
   "type": "t_mapping(t_address,t_mapping(t_uint256,t_uint256))"
  },
  {
   "astId": 31,
   "contract": "src/Playground.sol:Playground",
   "label": "items",
   "offset": 0,
   "slot": "5",
   "type": "t_array(t_uint256)dyn_storage"
  },
  {
   "astId": 33,
   "contract": "src/Playground.sol:Playground",
   "label": "lastPoker",
   "offset": 0,
   "slot": "6",
   "type": "t_address"
  }
 ],
 "types": {
  "t_address": {
   "encoding": "inplace",
   "label": "address",
   "numberOfBytes": "20"
  },
  "t_array(t_uint256)dyn_storage": {
   "encoding": "dynamic_array",
   "label": "uint256[]",
   "numberOfBytes": "32",
   "base": "t_uint256"
  },
  "t_bool": {
   "encoding": "inplace",
   "label": "bool",
   "numberOfBytes": "1"
  },
  "t_mapping(t_address,t_mapping(t_uint256,t_uint256))": {
   "encoding": "mapping",
   "key": "t_address",
   "label": "mapping(address => mapping(uint256 => uint256))",
   "numberOfBytes": "32",
   "value": "t_mapping(t_uint256,t_uint256)"
  },
  "t_mapping(t_address,t_uint256)": {
   "encoding": "mapping",
   "key": "t_address",
   "label": "mapping(address => uint256)",
   "numberOfBytes": "32",
   "value": "t_uint256"
  },
  "t_mapping(t_uint256,t_uint256)": {
   "encoding": "mapping",
   "key": "t_uint256",
   "label": "mapping(uint256 => uint256)",
   "numberOfBytes": "32",
   "value": "t_uint256"
  },
  "t_struct(Totals)15_storage": {
   "encoding": "inplace",
   "label": "struct Playground.Totals",
   "numberOfBytes": "32",
   "members": [
    {
     "astId": 12,
     "contract": "src/Playground.sol:Playground",
     "label": "lastTime",
     "offset": 0,
     "slot": "0",
     "type": "t_uint64"
    },
    {
     "astId": 14,
     "contract": "src/Playground.sol:Playground",
     "label": "index",
     "offset": 8,
     "slot": "0",
     "type": "t_uint192"
    }
   ]
  },
  "t_uint128": {
   "encoding": "inplace",
   "label": "uint128",
   "numberOfBytes": "16"
  },
  "t_uint192": {
   "encoding": "inplace",
   "label": "uint192",
   "numberOfBytes": "24"
  },
  "t_uint256": {
   "encoding": "inplace",
   "label": "uint256",
   "numberOfBytes": "32"
  },
  "t_uint64": {
   "encoding": "inplace",
   "label": "uint64",
   "numberOfBytes": "8"
  }
 }
}