go-pulse/core/vm/gas.go
gary rong b9df7ecdc3
all: seperate consensus error and evm internal error (#20830)
* all: seperate consensus error and evm internal error

There are actually two types of error will be returned when
a tranaction/message call is executed: (a) consensus error
(b) evm internal error. The former should be converted to
a consensus issue, e.g. The sender doesn't enough asset to
purchase the gas it specifies. The latter is allowed since
evm itself is a blackbox and internal error is allowed to happen.

This PR emphasizes the difference by introducing a executionResult
structure. The evm error is embedded inside. So if any error
returned, it indicates consensus issue happens.

And also this PR improve the `EstimateGas` API to return the concrete
revert reason if the transaction always fails

* all: polish

* accounts/abi/bind/backends: add tests

* accounts/abi/bind/backends, internal: cleanup error message

* all: address comments

* core: fix lint

* accounts, core, eth, internal: address comments

* accounts, internal: resolve revert reason if possible

* accounts, internal: address comments
2020-04-22 11:25:36 +03:00

54 lines
1.7 KiB
Go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package vm
import (
"math/big"
)
// Gas costs
const (
GasQuickStep uint64 = 2
GasFastestStep uint64 = 3
GasFastStep uint64 = 5
GasMidStep uint64 = 8
GasSlowStep uint64 = 10
GasExtStep uint64 = 20
)
// callGas returns the actual gas cost of the call.
//
// The cost of gas was changed during the homestead price change HF.
// As part of EIP 150 (TangerineWhistle), the returned gas is gas - base * 63 / 64.
func callGas(isEip150 bool, availableGas, base uint64, callCost *big.Int) (uint64, error) {
if isEip150 {
availableGas = availableGas - base
gas := availableGas - availableGas/64
// If the bit length exceeds 64 bit we know that the newly calculated "gas" for EIP150
// is smaller than the requested amount. Therefor we return the new gas instead
// of returning an error.
if !callCost.IsUint64() || gas < callCost.Uint64() {
return gas, nil
}
}
if !callCost.IsUint64() {
return 0, ErrGasUintOverflow
}
return callCost.Uint64(), nil
}