In solc 0.4.22 onward, it is possible to provide a string message containing details about the error that will be passed back to the caller (in
Does the gas usage of these statements depend on the length of the provided string?
I assume that the answer is no, since it would otherwise imply that this information is saved on the blockchain, and AFAIK, reverted transactions are not saved on the blockchain.
If I am correct, then it means that it's the Ethereum node itself which somehow knows how to return this message back to the caller.
Am I correct, and if yes, how exactly is the Ethereum node able to do that? To my understanding, it would need to get the
revert opcode (in the case of
revert) or the
invalid opcode (in case of
assert) returned from the transaction, and determine exactly where they occurred within the code.
Also, if this is indeed the case, then it means that the deployed bytecode should contain the message, meaning that the gas cost of the contract-deployment itself depends on the length of this message. Is that correct?