[pallet-revive] immutable data storage

[xermicus]

This PR introduces the concept of immutable storage data, used for Solidity immutable variables.

This is a minimal implementation. Immutable data is attached to a contract; to keep ContractInfo fixed in size, we only store the length there, and store the immutable data in a dedicated storage map instead. Which comes at the cost of requiring an additional storage read (costly) for contracts using this feature.

We discussed more optimal solutions not requiring any additional storage accesses internally, but they turned out to be non-trivial to implement. Another optimization benefiting multiple calls to the same contract in a single call stack would be to cache the immutable data in Stack. However, this potential creates a DOS vulnerability (the attack vector is to call into as many contracts in a single stack as possible, where they all have maximum immutable data to fill the cache as efficiently as possible). So this either has to be guaranteed to be a non-issue by limits, or, more likely, to have some logic to bound the cache. Eventually, we should think about introducing the concept of warm and cold storage reads (akin to EVM). Since immutable variables are commonly used in contracts, this change is blocking our initial launch and we should only optimize it properly in follow-ups.

This PR also disables the set_code_hash API (which isn't usable for Solidity contracts without pre-compiles anyways). With immutable storage attached to contracts, we now want to run the constructor of the new code hash to collect the immutable data during set_code_hash. This will be implemented in a follow up PR.

[xermicus]

bot fmt

[command-bot]

@xermicus https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7457393 was started for your command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh". Check out https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/pipelines?page=1&scope=all&username=group_605_bot to know what else is being executed currently.

Comment bot cancel 3-00b383a4-2df6-4f13-884d-24631d5a4793 to cancel this command or bot cancel to cancel all commands in this pull request.

[command-bot]

@xermicus Command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh" has finished. Result: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7457393 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7457393/artifacts/download.