package tezos-protocol-013-PtJakart

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package tezos-protocol-013-PtJakart
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Cache: This should always be the number of stakers that are directly or indirectly staked on this commitment.

Let StakersS mean "looking up the key S in Stakers".

A staker S is directly staked on C if Stakers[S] = C. A staker S is indirectly staked on C if C is an ancestor of Stakers[S].

This ensures we remove unreachable commitments at the end of a dispute in O(n) reads, where n is the length of the rejected branch.

We maintain the invariant that each branch has at least one staker. On rejection, we decrease stake count from the removed staker to the root, and reclaim commitments whose stake count (refcount) thus reaches zero.

In the worst case all commitments are dishonest and on the same branch. In practice we expect the honest branch, to be the longest, and dishonest branches to be of similar lengths, making removal require a small number of steps with respect to the total number of commitments.

type context = t

An abstract type for keys

type value = int32

The type of values

Tells if a given key is already bound to a storage bucket. Consumes Gas_repr.read_bytes_cost Z.zero.

Retrieve a value from the storage bucket at a given key ; returns Storage_errorMissing_key if the key is not set ; returns Storage_errorCorrupted_data if the deserialisation fails. Consumes Gas_repr.read_bytes_cost <size of the value>.

Retrieve a value from the storage bucket at a given key ; returns None if the value is not set ; returns Storage_error Corrupted_data if the deserialisation fails. Consumes Gas_repr.read_bytes_cost <size of the value> if present or Gas_repr.read_bytes_cost Z.zero.

Updates the content of a bucket ; returns A Storage_Error Missing_key if the value does not exists. Consumes serialization cost. Consumes Gas_repr.write_bytes_cost <size of the new value>. Returns the difference from the old to the new size.

Allocates a storage bucket at the given key and initializes it ; returns a Storage_errorExisting_key if the bucket exists. Consumes serialization cost. Consumes Gas_repr.write_bytes_cost <size of the value>. Returns the size.

Allocates a storage bucket at the given key and initializes it with a value ; just updates it if the bucket exists. Consumes serialization cost. Consumes Gas_repr.write_bytes_cost <size of the new value>. Returns the difference from the old (maybe 0) to the new size, and a boolean indicating if a value was already associated to this key.

When the value is Some v, allocates the data and initializes it with v ; just updates it if the bucket exists. When the value is None, delete the storage bucket when the value ; does nothing if the bucket does not exists. Consumes serialization cost. Consumes the same gas cost as either remove or init_set. Returns the difference from the old (maybe 0) to the new size, and a boolean indicating if a value was already associated to this key.

Delete a storage bucket and its contents ; returns a Storage_errorMissing_key if the bucket does not exists. Consumes Gas_repr.write_bytes_cost Z.zero. Returns the freed size.

Removes a storage bucket and its contents ; does nothing if the bucket does not exists. Consumes Gas_repr.write_bytes_cost Z.zero. Returns the freed size, and a boolean indicating if a value was already associated to this key.

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