CANCUN: EIP-1153 Transient Storage

[pldespaigne]

EIP 1153 Transient Storage

This is the first PR aiming to bring the Yellow Paper up to date with Cancun update

This PR translate EIP-1553 into the Yellow Paper.
Here is the PDF version of those changes: Paper.pdf

Definition

We formally define the Transient Storage as $\boldsymbol{\theta}$ (symbol not already used in the paper), in section 6. Transaction Execution.

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Updating functions $\Theta$, $\Lambda$ and $\Xi$

We updated every occurrence of the Message Call function $\boldsymbol{\Theta}$ to incorporate transient storage $\boldsymbol{\theta}$ as the second parameter and new resultant transient storage $\boldsymbol{\theta}'$ as the last returned parameter.

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We updated every occurrence of the Create function $\boldsymbol{\Lambda}$ to incorporate transient storage $\boldsymbol{\theta}$ as the second parameter and new resultant transient storage $\boldsymbol{\theta}'$ as the last returned parameter.

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We updated every occurrence of the Execution function $\boldsymbol{\Xi}$ to incorporate transient storage $\boldsymbol{\theta}$ as the second parameter and new resultant transient storage $\boldsymbol{\theta}'$ as the second returned parameter.

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STATICCALL Exception

We added $\small{TSTORE}$ to the list of forbidden opocodes during a static execution.

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Gas cost

We added $\small{TLOAD}$ and $\small{TSTORE}$ to gas opcode categories.

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We added a new fee tier for that category.

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Finally, we updated the gas cost function $C$ to handle those new opcodes.

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Opcodes Definition

We added $\small{TLOAD}$ and $\small{TSTORE}$ to the list of opcodes.

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[pldespaigne]

@yperbasis could you create a cancun branch please, so that I can update the target branch of the PR and mark it as ready to review 🙏

[yperbasis]

@yperbasis could you create a cancun branch please, so that I can update the target branch of the PR and mark it as ready to review 🙏

done

[pldespaigne]

Thanks!
PR is now ready to review!

@alexprut @benjaminion @RenanSouza2 @timbeiko @alexkroeger any feedback on that will be highly appreciated as well 🙏

[RenanSouza2]

Hey, I‘m not sure why I was mentionend but I have two suggestions,

the first one is to simplify the section 6.2 to
'The transient storage (eip1153), fomrally ...‘

the second one is to use Gwarmaccess in the gas formula instead of creating a new category

[pldespaigne]

Thanks for your feedback!

• What needs to be simplified in section 6.2 for you? Would you avoid to formally define the transient storage and simply says that it behave almost as the regular storage, like the EIP-1153 does?

• I did it this way so it's more future proof if one of those gas category change, but yeah it doesn't look clean, and I think I like it better using only $G_{warmaccess}$.

[RenanSouza2]

I have one more suggestion, to move the definition from section 6 (transaction execution) to section 9 (Execution model),

this could be integrated in 9.1 (basics), or there could be a revamp and expand the explanation of memory, storage,

my previous suggestion was to remove the sentences 'introduced by eip 1153, during the cancun update' and start by 'the transient storage (eip1153)[authors], formally ...'

[pldespaigne]

From what I understand, section 9 describe thing relative to a single execution context (such as memory, environment, etc...).

Structures used for the whole transaction (such as accrued sub-state) are defined in section 6.

Since transient storage is created at the beginning of the tx (and destroy at the end) and persist across contexts, I find it more logical to put it in section 6.
Again that's just my opinion, I'm happy to discuss this further and make that update if everybody agrees on it.

Thanks again for the feedbacks!

[RenanSouza2]

makes sense, 6.1 is substate and 6.2 is transient storage