Add XCM Precompile to pallet-xcm (#8693)

This PR adds the XCM precompile (with `xcmSend`, `xcmExecute` and
`weightMessage` functionalities) to `pallet-xcm`.

This follows the discussion we had on the now closed
[PR](#8471), which
attempted to add the precompile to `pallet-revive`, but that approach
would have introduced unwanted cyclic dependencies. That's why we
decided to migrate the precompile to `pallet-xcm`, avoiding adding
unnecessary dependencies to `pallet-revive`.

This PR should also encapsulate unit tests in `precompiles.rs` as well
as integration tests under
`cumulus/parachains/integration-tests/emulated/tests`.

See tracking parent
[issue](#6718)

---------

Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Siphamandla Mjoli <brianm445@yahoo.com>
Co-authored-by: Siphamandla Mjoli <siphamandla@parity.io>
Co-authored-by: Alexander Theißen <alex.theissen@me.com>
Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
Co-authored-by: PG Herveou <pgherveou@gmail.com>

Author: 6 people

Cargo.lock

@@ -399,4 +399,13 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
 			.saturating_add(T::DbWeight::get().reads(4))
 			.saturating_add(T::DbWeight::get().writes(3))
 	}
+
+	fn weigh_message() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 7_785_000 picoseconds.
+		Weight::from_parts(8_077_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
 }

cumulus/parachains/runtimes/assets/asset-hub-rococo/src/weights/pallet_xcm.rs

@@ -64,7 +64,7 @@ use pallet_asset_conversion_tx_payment::SwapAssetAdapter;
 use pallet_assets::precompiles::{InlineIdConfig, ERC20};
 use pallet_nfts::{DestroyWitness, PalletFeatures};
 use pallet_revive::evm::runtime::EthExtra;
-use pallet_xcm::EnsureXcm;
+use pallet_xcm::{precompiles::XcmPrecompile, EnsureXcm};
 use parachains_common::{
 	impls::DealWithFees, message_queue::*, AccountId, AssetIdForTrustBackedAssets, AuraId, Balance,
 	BlockNumber, CollectionId, Hash, Header, ItemId, Nonce, Signature, AVERAGE_ON_INITIALIZE_RATIO,
@@ -1080,6 +1080,7 @@ impl pallet_revive::Config for Runtime {
 	type Precompiles = (
 		ERC20<Self, InlineIdConfig<0x120>, TrustBackedAssetsInstance>,
 		ERC20<Self, InlineIdConfig<0x320>, PoolAssetsInstance>,
+		XcmPrecompile<Self>,
 	);
 	type AddressMapper = pallet_revive::AccountId32Mapper<Self>;
 	type RuntimeMemory = ConstU32<{ 128 * 1024 * 1024 }>;

cumulus/parachains/runtimes/assets/asset-hub-westend/src/lib.rs

@@ -373,4 +373,13 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
 			.saturating_add(T::DbWeight::get().reads(2))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+
+	fn weigh_message() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 7_785_000 picoseconds.
+		Weight::from_parts(8_077_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
 }

cumulus/parachains/runtimes/assets/asset-hub-westend/src/weights/pallet_xcm.rs

@@ -373,4 +373,13 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
 			.saturating_add(T::DbWeight::get().reads(2))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+
+	fn weigh_message() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 7_785_000 picoseconds.
+		Weight::from_parts(8_077_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
 }

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/weights/pallet_xcm.rs

@@ -375,4 +375,13 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
 			.saturating_add(T::DbWeight::get().reads(2))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+
+	fn weigh_message() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 7_785_000 picoseconds.
+		Weight::from_parts(8_077_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
 }

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-westend/src/weights/pallet_xcm.rs

@@ -363,4 +363,13 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
 			.saturating_add(T::DbWeight::get().reads(2))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+
+	fn weigh_message() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 7_785_000 picoseconds.
+		Weight::from_parts(8_077_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
 }

cumulus/parachains/runtimes/collectives/collectives-westend/src/weights/pallet_xcm.rs

@@ -363,4 +363,13 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
 			.saturating_add(T::DbWeight::get().reads(2))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+
+	fn weigh_message() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 7_785_000 picoseconds.
+		Weight::from_parts(8_077_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
 }

cumulus/parachains/runtimes/coretime/coretime-rococo/src/weights/pallet_xcm.rs

@@ -351,4 +351,13 @@ impl<T: frame_system::Config> pallet_xcm::WeightInfo for WeightInfo<T> {
 		Weight::from_parts(18_446_744_073_709_551_000, 0)
 			.saturating_add(Weight::from_parts(0, 0))
 	}
+
+	fn weigh_message() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 7_785_000 picoseconds.
+		Weight::from_parts(8_077_000, 0)
+			.saturating_add(Weight::from_parts(0, 0))
+	}
 }