Grcov report - lib.rs

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// Copyright 2019-2025 PureStake Inc.

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// This file is part of Moonbeam.

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// Moonbeam is free software: you can redistribute it and/or modify

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// it under the terms of the GNU General Public License as published by

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// the Free Software Foundation, either version 3 of the License, or

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// (at your option) any later version.

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// Moonbeam is distributed in the hope that it will be useful,

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// but WITHOUT ANY WARRANTY; without even the implied warranty of

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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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// GNU General Public License for more details.

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// You should have received a copy of the GNU General Public License

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// along with Moonbeam.  If not, see <http://www.gnu.org/licenses/>.

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#![cfg_attr(not(feature = "std"), no_std)]

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#[cfg(test)]

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mod mock;

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#[cfg(test)]

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mod tests;

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use core::marker::PhantomData;

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use fp_evm::{ExitError, IsPrecompileResult, PrecompileFailure};

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use precompile_utils::{

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	precompile_set::{is_precompile_or_fail, IsActivePrecompile},

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	prelude::*,

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};

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use sp_core::Get;

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const DUMMY_CODE: [u8; 5] = [0x60, 0x00, 0x60, 0x00, 0xfd];

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pub struct PrecompileRegistry<Runtime>(PhantomData<Runtime>);

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#[precompile_utils::precompile]

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impl<Runtime> PrecompileRegistry<Runtime>

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where

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	Runtime: pallet_evm::Config,

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	Runtime::PrecompilesType: IsActivePrecompile,

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	#[precompile::public("isPrecompile(address)")]

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	#[precompile::view]

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	fn is_precompile(handle: &mut impl PrecompileHandle, address: Address) -> EvmResult<bool> {

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		// We consider the precompile set is optimized to do at most one storage read.

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		// In the case of moonbeam, the storage item that can be read is pallet_asset::Asset

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		// (TODO make it more generic, maybe add a const generic on PrecompileRegistry type)

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		// Storage item: Asset:

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		// Blake2_128(16) + AssetId(16) + AssetDetails((4 * AccountId(20)) + (3 * Balance(16)) + 15)

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		handle.record_db_read::<Runtime>(175)?;

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		is_precompile_or_fail::<Runtime>(address.0, handle.remaining_gas())

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	#[precompile::public("isActivePrecompile(address)")]

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	#[precompile::view]

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	fn is_active_precompile(

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		handle: &mut impl PrecompileHandle,

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		address: Address,

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	) -> EvmResult<bool> {

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		// We consider the precompile set is optimized to do at most one storage read.

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		// In the case of moonbeam, the storage item that can be read is pallet_asset::Asset

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		// (TODO make it more generic, maybe add a const generic on PrecompileRegistry type)

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		// Storage item: Asset:

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		// Blake2_128(16) + AssetId(16) + AssetDetails((4 * AccountId(20)) + (3 * Balance(16)) + 15)

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		handle.record_db_read::<Runtime>(175)?;

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		match <Runtime::PrecompilesValue>::get()

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			.is_active_precompile(address.0, handle.remaining_gas())

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			IsPrecompileResult::Answer { is_precompile, .. } => Ok(is_precompile),

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			IsPrecompileResult::OutOfGas => Err(PrecompileFailure::Error {

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				exit_status: ExitError::OutOfGas,

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}),

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	#[precompile::public("updateAccountCode(address)")]

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	fn update_account_code(handle: &mut impl PrecompileHandle, address: Address) -> EvmResult<()> {

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		// Prevent touching addresses that are not precompiles.

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//

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		// We consider the precompile set is optimized to do at most one storage read.

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		// In the case of moonbeam, the storage item that can be read is pallet_asset::Asset

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		// (TODO make it more generic, maybe add a const generic on PrecompileRegistry type)

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		// Storage item: Asset:

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		// Blake2_128(16) + AssetId(16) + AssetDetails((4 * AccountId(20)) + (3 * Balance(16)) + 15)

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		handle.record_db_read::<Runtime>(175)?;

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		if !is_precompile_or_fail::<Runtime>(address.0, handle.remaining_gas())? {

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			return Err(revert("provided address is not a precompile"));

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		// pallet_evm::create_account read storage item pallet_evm::AccountCodes

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//

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		// AccountCodes: Blake2128(16) + H160(20) + Vec(5)

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		// We asume an existing precompile can hold at most 5 bytes worth of dummy code.

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		handle.record_db_read::<Runtime>(41)?;

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		pallet_evm::Pallet::<Runtime>::create_account(address.0, DUMMY_CODE.to_vec());

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		Ok(())

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