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core/vm: polish precompile contract code, add tests and benches

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* Update modexp gas calculation to new version
 * Fix modexp modulo 0 special case to return zero
This commit is contained in:
Péter Szilágyi
2017-08-10 16:39:43 +03:00
parent 7bbdf3e268
commit 6131dd55c5
5 changed files with 409 additions and 242 deletions
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15
core/vm/evm.go
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@ -36,16 +36,14 @@ type (
// run runs the given contract and takes care of running precompiles with a fallback to the byte code interpreter.
func run(evm *EVM, snapshot int, contract *Contract, input []byte) ([]byte, error) {
if contract.CodeAddr != nil {
precompiledContracts := PrecompiledContracts
precompiles := PrecompiledContractsHomestead
if evm.ChainConfig().IsMetropolis(evm.BlockNumber) {
precompiledContracts = PrecompiledContractsMetropolis
precompiles = PrecompiledContractsMetropolis
}
if p := precompiledContracts[*contract.CodeAddr]; p != nil {
if p := precompiles[*contract.CodeAddr]; p != nil {
return RunPrecompiledContract(p, input, contract)
}
}
return evm.interpreter.Run(snapshot, contract, input)
}
@ -147,10 +145,13 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
snapshot = evm.StateDB.Snapshot()
)
if !evm.StateDB.Exist(addr) {
if PrecompiledContracts[addr] == nil && evm.ChainConfig().IsEIP158(evm.BlockNumber) && value.Sign() == 0 {
precompiles := PrecompiledContractsHomestead
if evm.ChainConfig().IsMetropolis(evm.BlockNumber) {
precompiles = PrecompiledContractsMetropolis
}
if precompiles[addr] == nil && evm.ChainConfig().IsEIP158(evm.BlockNumber) && value.Sign() == 0 {
return nil, gas, nil
}
evm.StateDB.CreateAccount(addr)
}
evm.Transfer(evm.StateDB, caller.Address(), to.Address(), value)