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https://github.com/ethereum/go-ethereum.git
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c2e6df1b99
## Why this should be merged Importing some `avalanchego` test fixtures automatically imports `coreth` packages that register extras, which affects testing of other VMs that depend on `libevm`. All other registered extras can be cleared with the pattern in this PR. ## How this works Uses the `register.AtMostOnce` type already used in `params` and `types`. I forgot to update the `vm` package when implementing the type. ## How this was tested Existing unit tests.
82 lines
2.7 KiB
Go
82 lines
2.7 KiB
Go
// Copyright 2024-2025 the libevm authors.
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//
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// The libevm additions to go-ethereum are free software: you can redistribute
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// them and/or modify them under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation, either version 3 of the License,
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// or (at your option) any later version.
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//
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// The libevm additions are distributed in the hope that they 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 GNU Lesser
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// General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see
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// <http://www.gnu.org/licenses/>.
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package vm
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import (
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"github.com/ava-labs/libevm/libevm/register"
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"github.com/ava-labs/libevm/params"
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)
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// RegisterHooks registers the Hooks. It is expected to be called in an `init()`
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// function and MUST NOT be called more than once.
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func RegisterHooks(h Hooks) {
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libevmHooks.MustRegister(h)
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}
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// TestOnlyClearRegisteredHooks clears the [Hooks] previously passed to
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// [RegisterHooks]. It panics if called from a non-testing call stack.
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func TestOnlyClearRegisteredHooks() {
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libevmHooks.TestOnlyClear()
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}
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var libevmHooks register.AtMostOnce[Hooks]
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// Hooks are arbitrary configuration functions to modify default VM behaviour.
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// See [RegisterHooks].
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type Hooks interface {
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OverrideNewEVMArgs(*NewEVMArgs) *NewEVMArgs
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OverrideEVMResetArgs(params.Rules, *EVMResetArgs) *EVMResetArgs
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}
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// NewEVMArgs are the arguments received by [NewEVM], available for override
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// via [Hooks].
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type NewEVMArgs struct {
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BlockContext BlockContext
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TxContext TxContext
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StateDB StateDB
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ChainConfig *params.ChainConfig
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Config Config
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}
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// EVMResetArgs are the arguments received by [EVM.Reset], available for
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// override via [Hooks].
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type EVMResetArgs struct {
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TxContext TxContext
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StateDB StateDB
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}
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func overrideNewEVMArgs(
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blockCtx BlockContext,
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txCtx TxContext,
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statedb StateDB,
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chainConfig *params.ChainConfig,
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config Config,
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) (BlockContext, TxContext, StateDB, *params.ChainConfig, Config) {
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if !libevmHooks.Registered() {
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return blockCtx, txCtx, statedb, chainConfig, config
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}
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args := libevmHooks.Get().OverrideNewEVMArgs(&NewEVMArgs{blockCtx, txCtx, statedb, chainConfig, config})
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return args.BlockContext, args.TxContext, args.StateDB, args.ChainConfig, args.Config
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}
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func (evm *EVM) overrideEVMResetArgs(txCtx TxContext, statedb StateDB) (TxContext, StateDB) {
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if !libevmHooks.Registered() {
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return txCtx, statedb
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}
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args := libevmHooks.Get().OverrideEVMResetArgs(evm.chainRules, &EVMResetArgs{txCtx, statedb})
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return args.TxContext, args.StateDB
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}
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