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core/vm: implement RETURNDATA metropolis opcodes

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This commit is contained in:
Jeffrey Wilcke
2017-08-16 13:07:33 +03:00
committed by Péter Szilágyi
parent 76069eef38
commit 9bd6068fef
6 changed files with 253 additions and 171 deletions
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26
core/vm/gas_table.go
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@ -91,6 +91,32 @@ func gasCalldataCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *St
return gas, nil
}
func gasReturnDataCopy(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
gas, err := memoryGasCost(mem, memorySize)
if err != nil {
return 0, err
}
var overflow bool
if gas, overflow = math.SafeAdd(gas, GasFastestStep); overflow {
return 0, errGasUintOverflow
}
words, overflow := bigUint64(stack.Back(2))
if overflow {
return 0, errGasUintOverflow
}
if words, overflow = math.SafeMul(toWordSize(words), params.CopyGas); overflow {
return 0, errGasUintOverflow
}
if gas, overflow = math.SafeAdd(gas, words); overflow {
return 0, errGasUintOverflow
}
return gas, nil
}
func gasSStore(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
var (
y, x = stack.Back(1), stack.Back(0)