solidity Packed layout for memory arrays with small base types.

Packed layout for memory arrays with small base types.

Open jrynkiew opened this issue 2 years ago • 4 comments
I think we should look into memory handling on EVM, and not into gas cost reimbursement mechanisms. Obviously there is no benefit to using anything apart from strings in the EVM for max contract memory storage handling, as uint8's occupy a much larger memory slot than they should.
Please look into EVM memory management, as I am intending to store massive data on EVM compatible smart contracts on IoTeX blockchain throughout a chain 10,000+ interconnected smart contracts, and memory optimization + compression are a top priority for me.
Please see below npx hardhat test results:
jeremi@jeremi-ThinkPad-X260:~/Code/JRPC_Alpha$ npx hardhat test


  Test1. Deploy contract with given string. Compare deployed contract string contents with initial string. Change string. Compare again
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Deploying smart contract with data string....
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Contents of deployed smart contract:
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**********************************
Compairing values of Smart Contract contents to input variable.
**********************************
Modifying smart contract
**********************************
Contents of smart contract after modification
**********************************
Hola, mundo!
**********************************
Checking if transaction is mined
**********************************
Checking if the contract updated correctly
**********************************
End of Test
    ✔ Should return the new string once it's changed (5679ms)

  Test 2. Read file, encode it, deploy, return and compare arrays
**********************************
read in the file ./assets/star.glb
**********************************
<Buffer 67 6c 54 46 02 00 00 00 a0 58 0e 00 38 0d 00 00 4a 53 4f 4e 7b 22 61 73 73 65 74 22 3a 7b 22 67 65 6e 65 72 61 74 6f 72 22 3a 22 4b 68 72 6f 6e 6f 73 ... 940142 more bytes>
**********************************
Encoded file. encoded into Uint8Array of size 255. Anything past this size fails to deploy.
**********************************
Uint8Array(255) [
  103, 108,  84,  70,   2,   0,   0,   0, 239, 191, 189,  88,
   14,   0,  56,  13,   0,   0,  74,  83,  79,  78, 123,  34,
   97, 115, 115, 101, 116,  34,  58, 123,  34, 103, 101, 110,
  101, 114,  97, 116, 111, 114,  34,  58,  34,  75, 104, 114,
  111, 110, 111, 115,  32, 103, 108,  84,  70,  32,  66, 108,
  101, 110, 100, 101, 114,  32,  73,  47,  79,  32, 118,  49,
   46,  56,  46,  49,  57,  34,  44,  34, 118, 101, 114, 115,
  105, 111, 110,  34,  58,  34,  50,  46,  48,  34, 125,  44,
   34, 115,  99, 101,
  ... 155 more items
]
**********************************
Compiling smart contract....
**********************************
Deploying smart contract....
**********************************
Contents of smart contract:
**********************************
Contract {
  interface: Interface {
    fragments: [ [ConstructorFragment], [FunctionFragment], [FunctionFragment] ],
    _abiCoder: AbiCoder { coerceFunc: null },
    functions: {
      'greet()': [FunctionFragment],
      'setGreeting(bytes)': [FunctionFragment]
    },
    errors: {},
    events: {},
    structs: {},
    deploy: ConstructorFragment {
      name: null,
      type: 'constructor',
      inputs: [Array],
      payable: false,
      stateMutability: 'nonpayable',
      gas: null,
      _isFragment: true
    },
    _isInterface: true
  },
  provider: EthersProviderWrapper {
    _isProvider: true,
    _events: [],
    _emitted: {
      block: -2,
      't:0x5776d2e98a703991c5a1cb497d3f839a2a5037c0db6157c469c65278751514d9': 1,
      't:0xdd63a23c79e2a630add6cfd34c9eaa95677300841330cfd34e847e75485bac48': 2
    },
    disableCcipRead: false,
    formatter: Formatter { formats: [Object] },
    anyNetwork: false,
    _networkPromise: Promise { [Object] },
    _maxInternalBlockNumber: 0,
    _lastBlockNumber: -2,
    _maxFilterBlockRange: 10,
    _pollingInterval: 4000,
    _fastQueryDate: 1659570751857,
    connection: { url: 'http://localhost:8545' },
    _nextId: 42,
    _hardhatProvider: BackwardsCompatibilityProviderAdapter {
      _wrapped: [FixedGasProvider],
      _provider: [FixedGasProvider],
      sendAsync: [Function: bound sendAsync],
      send: [Function: bound send],
      _sendJsonRpcRequest: [Function: bound _sendJsonRpcRequest] AsyncFunction
    },
    _eventLoopCache: { detectNetwork: [Promise] },
    _network: { chainId: 31337, name: 'unknown' },
    _internalBlockNumber: Promise { [Object] },
    _fastBlockNumber: 0,
    _fastBlockNumberPromise: Promise { 0 }
  },
  signer: SignerWithAddress {
    _isSigner: true,
    address: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
    _signer: JsonRpcSigner {
      _isSigner: true,
      provider: [EthersProviderWrapper],
      _address: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
      _index: null
    },
    provider: EthersProviderWrapper {
      _isProvider: true,
      _events: [],
      _emitted: [Object],
      disableCcipRead: false,
      formatter: [Formatter],
      anyNetwork: false,
      _networkPromise: [Promise],
      _maxInternalBlockNumber: 0,
      _lastBlockNumber: -2,
      _maxFilterBlockRange: 10,
      _pollingInterval: 4000,
      _fastQueryDate: 1659570751857,
      connection: [Object],
      _nextId: 42,
      _hardhatProvider: [BackwardsCompatibilityProviderAdapter],
      _eventLoopCache: [Object],
      _network: [Object],
      _internalBlockNumber: [Promise],
      _fastBlockNumber: 0,
      _fastBlockNumberPromise: [Promise]
    }
  },
  callStatic: {
    'greet()': [Function (anonymous)],
    'setGreeting(bytes)': [Function (anonymous)],
    greet: [Function (anonymous)],
    setGreeting: [Function (anonymous)]
  },
  estimateGas: {
    'greet()': [Function (anonymous)],
    'setGreeting(bytes)': [Function (anonymous)],
    greet: [Function (anonymous)],
    setGreeting: [Function (anonymous)]
  },
  functions: {
    'greet()': [Function (anonymous)],
    'setGreeting(bytes)': [Function (anonymous)],
    greet: [Function (anonymous)],
    setGreeting: [Function (anonymous)]
  },
  populateTransaction: {
    'greet()': [Function (anonymous)],
    'setGreeting(bytes)': [Function (anonymous)],
    greet: [Function (anonymous)],
    setGreeting: [Function (anonymous)]
  },
  filters: {},
  _runningEvents: {},
  _wrappedEmits: {},
  address: '0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0',
  resolvedAddress: Promise { '0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0' },
  'greet()': [Function (anonymous)],
  'setGreeting(bytes)': [Function (anonymous)],
  greet: [Function (anonymous)],
  setGreeting: [Function (anonymous)],
  deployTransaction: {
    hash: '0x20c4ac227cc0ce4b1946d4fe7d989da8d2e3ba15d4416ef471bf9ea562b20a6b',
    type: 2,
    accessList: [],
    blockHash: '0xb73fa57f3f3d9692d4b057a286f79d8a7ea5c73534bf44b8c9c4fd3ca86ab741',
    blockNumber: 3,
    transactionIndex: 0,
    confirmations: 1,
    from: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
    gasPrice: BigNumber { value: "1902430604" },
    maxPriorityFeePerGas: BigNumber { value: "1000000000" },
    maxFeePerGas: BigNumber { value: "2804861208" },
    gasLimit: BigNumber { value: "744005" },
    to: null,
    value: BigNumber { value: "0" },
    nonce: 2,
    data: '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',
    r: '0x71a3243ea5e7dae6b4046d28178e38dab279337794366b7f5e040b6d8c41f695',
    s: '0x4022ea5094c4aef41ed1dae63395ef6095a79b856628a3eb36491d94ca14d57f',
    v: 0,
    creates: '0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0',
    chainId: 31337,
    wait: [Function (anonymous)]
  }
}
**********************************
Contents of deployed array:
**********************************
[
  103, 108,  84,  70,   2,   0,   0,   0, 239, 191, 189,  88,
   14,   0,  56,  13,   0,   0,  74,  83,  79,  78, 123,  34,
   97, 115, 115, 101, 116,  34,  58, 123,  34, 103, 101, 110,
  101, 114,  97, 116, 111, 114,  34,  58,  34,  75, 104, 114,
  111, 110, 111, 115,  32, 103, 108,  84,  70,  32,  66, 108,
  101, 110, 100, 101, 114,  32,  73,  47,  79,  32, 118,  49,
   46,  56,  46,  49,  57,  34,  44,  34, 118, 101, 114, 115,
  105, 111, 110,  34,  58,  34,  50,  46,  48,  34, 125,  44,
   34, 115,  99, 101,
  ... 155 more items
]
**********************************
Check if the deployed uint8array is the same as the one passed to the contract
original Array: 103,108,84,70,2,0,0,0,239,191,189,88,14,0,56,13,0,0,74,83,79,78,123,34,97,115,115,101,116,34,58,123,34,103,101,110,101,114,97,116,111,114,34,58,34,75,104,114,111,110,111,115,32,103,108,84,70,32,66,108,101,110,100,101,114,32,73,47,79,32,118,49,46,56,46,49,57,34,44,34,118,101,114,115,105,111,110,34,58,34,50,46,48,34,125,44,34,115,99,101,110,101,34,58,48,44,34,115,99,101,110,101,115,34,58,91,123,34,110,97,109,101,34,58,34,83,99,101,110,101,34,44,34,110,111,100,101,115,34,58,91,48,44,49,44,50,93,125,93,44,34,110,111,100,101,115,34,58,91,123,34,109,101,115,104,34,58,48,44,34,110,97,109,101,34,58,34,67,105,114,99,108,101,34,44,34,116,114,97,110,115,108,97,116,105,111,110,34,58,91,48,44,45,48,46,51,48,48,48,48,48,48,49,49,57,50,48,57,50,56,57,54,44,48,93,125,44,123,34,109,101,115,104,34,58,49,44,34,110,97,109,101,34,58,34,67,105,114,99,108,101,46,48,48,50
Deployed Array: 103,108,84,70,2,0,0,0,239,191,189,88,14,0,56,13,0,0,74,83,79,78,123,34,97,115,115,101,116,34,58,123,34,103,101,110,101,114,97,116,111,114,34,58,34,75,104,114,111,110,111,115,32,103,108,84,70,32,66,108,101,110,100,101,114,32,73,47,79,32,118,49,46,56,46,49,57,34,44,34,118,101,114,115,105,111,110,34,58,34,50,46,48,34,125,44,34,115,99,101,110,101,34,58,48,44,34,115,99,101,110,101,115,34,58,91,123,34,110,97,109,101,34,58,34,83,99,101,110,101,34,44,34,110,111,100,101,115,34,58,91,48,44,49,44,50,93,125,93,44,34,110,111,100,101,115,34,58,91,123,34,109,101,115,104,34,58,48,44,34,110,97,109,101,34,58,34,67,105,114,99,108,101,34,44,34,116,114,97,110,115,108,97,116,105,111,110,34,58,91,48,44,45,48,46,51,48,48,48,48,48,48,49,49,57,50,48,57,50,56,57,54,44,48,93,125,44,123,34,109,101,115,104,34,58,49,44,34,110,97,109,101,34,58,34,67,105,114,99,108,101,46,48,48,50
**********************************
Updating array in Smart Contract
**********************************
Checking if transaction is mined
**********************************
Checking if the contract updated correctly
original Array: 1,2,3
Deployed Array: 1,2,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
**********************************
End of Test
    ✔ Should return the new uint8array once it's changed (1240ms)


  2 passing (7s)

jeremi@jeremi-ThinkPad-X260:~/Code/JRPC_Alpha$ 

If you read into the above output, you will see that the array of uint8's are compiled into a data structure and submitted to the smart contract with lots of empty space, like 000000000000000000000000000000000000000000000000000000006000 if you inspect the data key. data: '0x60806040523480156200001157600080fd5b50604051620009b7380380620009b7833981810160405281019062000037919062000272565b620000416200011d565b60005b82518160ff1610156200010057828160ff16815181106200008e577f4e487b7100000000000000000000000000000000000000000000000000000000600052603260045260246000fd5b602001015160f81c60f81b60f81c828260ff1660ff8110620000d9577f4e487b7100000000000000000000000000000000000000000000000000000000600052603260045260246000fd5b602002019060ff16908160ff16815250508080620000f7906200038f565b91505062000044565b508060009060ff6200011492919062000140565b5050506200042d565b60405180611fe0016040528060ff90602082028036833780820191505090505090565b8260ff601f01602090048101928215620001ce5791602002820160005b838211156200019d57835183826101000a81548160ff021916908360ff16021790555092602001926001016020816000010492830192600103026200015d565b8015620001cc5782816101000a81549060ff02191690556001016020816000010492830192600103026200019d565b505b509050620001dd9190620001e1565b5090565b5b80821115620001fc576000816000905550600101620001e2565b5090565b6000620002176200021184620002e0565b620002b7565b9050828152602081018484840111156200023057600080fd5b6200023d84828562000323565b509392505050565b600082601f8301126200025757600080fd5b81516200026984826020860162000200565b91505092915050565b6000602082840312156200028557600080fd5b600082015167ffffffffffffffff811115620002a057600080fd5b620002ae8482850162000245565b91505092915050565b6000620002c3620002d6565b9050620002d1828262000359565b919050565b6000604051905090565b600067ffffffffffffffff821115620002fe57620002fd620003ed565b5b62000309826200041c565b9050602081019050919050565b600060ff82169050919050565b60005b838110156200034357808201518184015260208101905062000326565b8381111562000353576000848401525b50505050565b62000364826200041c565b810181811067ffffffffffffffff82111715620003865762000385620003ed565b5b80604052505050565b60006200039c8262000316565b915060ff821415620003b357620003b2620003be565b5b600182019050919050565b7f4e487b7100000000000000000000000000000000000000000000000000000000600052601160045260246000fd5b7f4e487b7100000000000000000000000000000000000000000000000000000000600052604160045260246000fd5b6000601f19601f8301169050919050565b61057a806200043d6000396000f3fe608060405234801561001057600080fd5b50600436106100365760003560e01c8063b8e46d3a1461003b578063cfae321714610057575b600080fd5b61005560048036038101906100509190610300565b610075565b005b61005f61014d565b60405161006c91906103bf565b60405180910390f35b61007d6101be565b60005b82518160ff16101561013657828160ff16815181106100c8577f4e487b7100000000000000000000000000000000000000000000000000000000600052603260045260246000fd5b602001015160f81c60f81b60f81c828260ff1660ff8110610112577f4e487b7100000000000000000000000000000000000000000000000000000000600052603260045260246000fd5b602002019060ff16908160ff1681525050808061012e906104ab565b915050610080565b508060009060ff6101489291906101e1565b505050565b6101556101be565b600060ff80602002604051908101604052809291908260ff80156101b4576020028201916000905b82829054906101000a900460ff1660ff168152602001906001019060208260000104928301926001038202915080841161017d5790505b5050505050905090565b60405180611fe0016040528060ff90602082028036833780820191505090505090565b8260ff601f0160209004810192821561026a5791602002820160005b8382111561023b57835183826101000a81548160ff021916908360ff16021790555092602001926001016020816000010492830192600103026101fd565b80156102685782816101000a81549060ff021916905560010160208160000104928301926001030261023b565b505b509050610277919061027b565b5090565b5b8082111561029457600081600090555060010161027c565b5090565b60006102ab6102a684610400565b6103db565b9050828152602081018484840111156102c357600080fd5b6102ce84828561046b565b509392505050565b600082601f8301126102e757600080fd5b81356102f7848260208601610298565b91505092915050565b60006020828403121561031257600080fd5b600082013567ffffffffffffffff81111561032c57600080fd5b610338848285016102d6565b91505092915050565b600061034d83836103b0565b60208301905092915050565b6103628161043b565b61036c8184610453565b925061037782610431565b8060005b838110156103a857815161038f8782610341565b965061039a83610446565b92505060018101905061037b565b505050505050565b6103b98161045e565b82525050565b6000611fe0820190506103d56000830184610359565b92915050565b60006103e56103f6565b90506103f1828261047a565b919050565b6000604051905090565b600067ffffffffffffffff82111561041b5761041a610504565b5b61042482610533565b9050602081019050919050565b6000819050919050565b600060ff9050919050565b6000602082019050919050565b600081905092915050565b600060ff82169050919050565b82818337600083830152505050565b61048382610533565b810181811067ffffffffffffffff821117156104a2576104a1610504565b5b80604052505050565b60006104b68261045e565b915060ff8214156104ca576104c96104d5565b5b600182019050919050565b7f4e487b7100000000000000000000000000000000000000000000000000000000600052601160045260246000fd5b7f4e487b7100000000000000000000000000000000000000000000000000000000600052604160045260246000fd5b6000601f19601f830116905091905056fea2646970667358221220e9b71659db8d42255f6c51811b1d301fadb2b17da2f3d34f04b8eb332d58c41064736f6c63430008040033000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000ff676c544602000000efbfbd580e00380d00004a534f4e7b226173736574223a7b2267656e657261746f72223a224b68726f6e6f7320676c544620426c656e64657220492f4f2076312e382e3139222c2276657273696f6e223a22322e30227d2c227363656e65223a302c227363656e6573223a5b7b226e616d65223a225363656e65222c226e6f646573223a5b302c312c325d7d5d2c226e6f646573223a5b7b226d657368223a302c226e616d65223a22436972636c65222c227472616e736c6174696f6e223a5b302c2d302e33303030303030313139323039323839362c305d7d2c7b226d657368223a312c226e616d65223a22436972636c652e30303200'
The first test contains a string of length 41,280 characters. This works as intended on hardhat, and is limited by the EVM memory limiter https://eips.ethereum.org/EIPS/eip-170 as far as I understand it.
However, why does the uint8array end up being capped at 255 elements and storing lots of empty data in the process? The code should be natively optmized in my opinion to work with bits of memory, not 32-bit strings and uint256's.
Aug 04 '22 17:08 jrynkiew
I'm not entirely sure I understand what you're getting at, but the memory layout of dynamic arrays other than string or bytes is specified to be padded to 32 byte boundaries per element and that's not easily changed without a major breaking change (even though we could consider it as breaking change). Is there any particular reason why you would need to use uint8[] instead of bytes if you want a packed layout?
Aug 04 '22 17:08 ekpyron
Hello @ekpyron,
Thank you for getting back to me. I think that the uint arrays should be automatically packed into the available memory. Otherwise there is no reason to use this feature at all, and make all arrays strings or bytes.
I will use bytes arrays which I will pack myself with data from now on, however I would like to see this memory optimisation done on Solidity to be able to be in full control of memory usage of Solidity.
Aug 04 '22 22:08 jrynkiew
I think that the uint arrays should be automatically packed into the available memory. Otherwise there is no reason to use this feature at all, and make all arrays strings or bytes.
Depends on your use case. Packing is not free. EVM operates natively on 32-byte words so accessing a value that's the only thing in a word is cheaper than extracting it from a packed slot with bit masks and shifts. Whether this makes sense or not really depends on the relation between the cost of memory and the cost of operating on it. That calculation is for example very different for storage which is why there the arrays are packed.
uint8[] is a bit of a corner case because you almost always want bytes - that's why bytes exists. But for bigger integers stored in memory the padding sometimes makes more sense.
Aug 05 '22 15:08 cameel
Anyway, can you concisely describe what you are actually requesting? Your post is long but also very vague about the specifics. Which types would be affected (only ints? what about fixed bytes? addresses? function pointers)? In which locations (memory, storage, calldata)? How would that affect structs?
In any case, I doubt we would want to change the semantics of the existing types given that this is a trade-off. We'd probably either introduce new types or some syntax to declare them as packed.
Somewhat related issue: #11691.
Aug 05 '22 15:08 cameel
I'm closing this, as a part of general memory optimizations on our roadmap.
Sep 14 '22 08:09 ekpyron
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Packed layout for memory arrays with small base types.

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