Alexander Theißen 51c37ecc15 contracts: Allow runtime authors to define a chain extension (#7548) ...

* Make host functions return TrapReason

This avoids the need to manually store any trap reasons
to the `Runtime` from the host function. This adds the following
benefits:

* It properly composes with the upcoming chain extensions
* Missing to set a trap value is now a compile error

* Add chain extension

The chain extension is a way for the contract author to add new
host functions for contracts to call.

* Add tests for chain extensions

* Fix regression in set_rent.wat fixture

Not all offsets where properly updated when changing the fixtures
for the new salt on instantiate.

* Pre-charge a weight amount based off the specified length

* Improve fn write docs

* Renamed state to phantom

* Fix typo

2021-01-04 11:15:17 +00:00

substrate

contracts: Allow runtime authors to define a chain extension (#7548)

2021-01-04 11:15:17 +00:00

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