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Make storage instructions cost #361

Merged
merged 2 commits into from
May 16, 2024
Merged

Make storage instructions cost #361

merged 2 commits into from
May 16, 2024

Commits on May 15, 2024

  1. piecrust: upgrade dusk-wasmtime to 21.0.0-alpha

    Eduardo Leegwater Simões committed May 15, 2024
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  2. piecrust: make storage instructions cost more 

    Each byte stored in the WebAssembly linear memory of a contract is made
to cost 4 units of fuel - in the units that wasmtime uses. This makes
storing a single byte as expensive as, for example, multiplying or
subtracting two numbers.

The `MemoryGrow` instruction is purposefully left with the default price
- just like any other instruction, due the fact that expanding the size
of the linear memory doesn't actually cost a lot of resources, owing to
the fact that a page that is never written to is never written to disk.

A single contract's compiled bytecode will contain a header, encoding
within it information about the cost per WebAssembly instruction. If
these don't match the costs configured for the current `VM`
instantiation, the contract will be recompiled, just as what happens if
the native instruction set doesn't match.

See-also: #359
    Eduardo Leegwater Simões committed May 15, 2024
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