mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-06-26 16:36:17 +00:00
f906679f6f
- remaining gas higher than the input gas is not allowed (otherwise it would overflow as well) - remaining gas can be equal to the input gas - add new test and `vm.PrecompileEnvironment` stub
51 lines
1.9 KiB
Go
51 lines
1.9 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 legacy provides converters between legacy types and their refactored
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// equivalents.
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package legacy
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import (
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"errors"
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"fmt"
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"github.com/ava-labs/libevm/core/vm"
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)
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var (
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errRemainingGasExceedsSuppliedGas = errors.New("remaining gas exceeds supplied gas")
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)
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// PrecompiledStatefulContract is the legacy signature of
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// [vm.PrecompiledStatefulContract], which explicitly accepts and returns gas
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// values. Instances SHOULD NOT use the [vm.PrecompileEnvironment]
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// gas-management methods as this may result in unexpected behaviour.
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type PrecompiledStatefulContract func(env vm.PrecompileEnvironment, input []byte, suppliedGas uint64) (ret []byte, remainingGas uint64, err error)
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// Upgrade converts the legacy precompile signature into the now-required form.
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func (c PrecompiledStatefulContract) Upgrade() vm.PrecompiledStatefulContract {
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return func(env vm.PrecompileEnvironment, input []byte) ([]byte, error) {
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gas := env.Gas()
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ret, remainingGas, err := c(env, input, gas)
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if remainingGas > gas {
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return ret, fmt.Errorf("%w: %d > %d", errRemainingGasExceedsSuppliedGas, remainingGas, gas)
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}
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if !env.UseGas(gas - remainingGas) {
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return ret, vm.ErrOutOfGas
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}
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return ret, err
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}
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}
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