refactor: ckb-script package overhaul #4803
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This commit revisits ckb-script package, it re-architects the whole data flow within ckb-script, to make it simpler and more maintainable
In the original refactoring work, the verifying context data is kept in `Arc<SgData>` structure, which contains `Arc<TxData>`, which then contains `Arc<ResolvedTransaction>`. Accessing a specific field on a CKB transaction requires traversing through 3 `Arc` structures, which would be 3 levels of indirection. Benchmarks show that those nested memory indirections cost us ~3% of transaction verifying performance, our best guess is that the nested indirections result in enough cache misses to cause the differences. This commit changes the code so instead of nested `Arc`s, we now use flattened structs that then contain a series of `Arc`s. Now at most one `Arc` would get in the way to access a specific field of the CKB transaction to verify. Note that `consensus` and `tx_env` still hids in 2 nested levels of `Arc`, here we are balancing the nested levels of `Arc`, and the number of `Arc`s contained in the flattend `TxData` and `SgData` structure. Right now we work under the assumption that if consensus parameters are required indeed, a nested level of indirection won't be the bottleneck. However, this might or might not change in the future, when it becomes a problem, we will revisit the tradeoff then.
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This commit revisits ckb-script package, it re-architects the whole data flow within ckb-script, to make it simpler and more maintainable
What problem does this PR solve?
Issue Number: close #xxx
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Proposal: xxx
What's Changed:
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