mirror of
https://github.com/ethereum/go-ethereum.git
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e35febe777
## Why this should be merged In case a tx's execution (specifically a registered precompile) should be invalidated, this allows the EVM to find this error. ## How this works Adds a setter and getter that can be called from a precompile. ## How this was tested UT
108 lines
3.9 KiB
Go
108 lines
3.9 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 core
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import (
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"fmt"
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"github.com/ava-labs/libevm/core/vm"
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"github.com/ava-labs/libevm/log"
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"github.com/ava-labs/libevm/params"
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)
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func (st *StateTransition) rulesHooks() params.RulesHooks {
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bCtx := st.evm.Context
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rules := st.evm.ChainConfig().Rules(bCtx.BlockNumber, bCtx.Random != nil, bCtx.Time)
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return rules.Hooks()
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}
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// NOTE: other than the final paragraph, the comment on
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// [StateTransition.TransitionDb] is copied, verbatim, from the upstream
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// version, which has been changed to [StateTransition.transitionDb] to allow
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// its behaviour to be augmented.
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// Keeps the vm package imported by this specific file so VS Code can support
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// comments like [vm.EVM].
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var _ = (*vm.EVM)(nil)
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// TransitionDb will transition the state by applying the current message and
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// returning the evm execution result with following fields.
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//
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// - used gas: total gas used (including gas being refunded)
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// - returndata: the returned data from evm
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// - concrete execution error: various EVM errors which abort the execution, e.g.
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// ErrOutOfGas, ErrExecutionReverted
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//
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// However if any consensus issue encountered, return the error directly with
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// nil evm execution result.
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//
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// libevm-specific behaviour: if, during execution, [vm.EVM.InvalidateExecution]
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// is called with a non-nil error then said error will be returned, wrapped. All
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// state transitions (e.g. nonce incrementing) will be reverted to a snapshot
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// taken before execution.
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func (st *StateTransition) TransitionDb() (*ExecutionResult, error) {
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if err := st.canExecuteTransaction(); err != nil {
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return nil, err
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}
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snap := st.state.Snapshot() // computationally cheap operation
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res, err := st.transitionDb() // original geth implementation
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// [NOTE]: At the time of implementation of this libevm override, non-nil
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// values of `err` and `invalid` (below) are mutually exclusive. However, as
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// a defensive measure, we don't return early on non-nil `err` in case an
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// upstream update breaks this invariant.
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if invalid := st.evm.ExecutionInvalidated(); invalid != nil {
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st.state.RevertToSnapshot(snap)
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err = fmt.Errorf("execution invalidated: %w", invalid)
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}
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return res, err
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}
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// canExecuteTransaction is a convenience wrapper for calling the
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// [params.RulesHooks.CanExecuteTransaction] hook.
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func (st *StateTransition) canExecuteTransaction() error {
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hooks := st.rulesHooks()
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if err := hooks.CanExecuteTransaction(st.msg.From, st.msg.To, st.state); err != nil {
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log.Debug(
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"Transaction execution blocked by libevm hook",
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"from", st.msg.From,
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"to", st.msg.To,
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"hooks", log.TypeOf(hooks),
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"reason", err,
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)
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return err
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}
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return nil
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}
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// consumeMinimumGas updates the gas remaining to reflect the value returned by
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// [params.RulesHooks.MinimumGasConsumption]. It MUST be called after all code
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// that modifies gas consumption but before the balance is returned for
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// remaining gas.
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func (st *StateTransition) consumeMinimumGas() {
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limit := st.msg.GasLimit
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minConsume := min(
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limit, // as documented in [params.RulesHooks]
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st.rulesHooks().MinimumGasConsumption(limit),
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)
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st.gasRemaining = min(
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st.gasRemaining,
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limit-minConsume,
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)
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}
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