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Fix BlockReward contract "arithmetic operation overflow" (#8611)

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* Fix BlockReward contract "arithmetic operation overflow"

* Add docs on how execute_as_system works

* Fix typo
This commit is contained in:
Wei Tang 2018-05-14 22:26:18 +08:00 committed by André Silva
parent 938c3707fc
commit af90fbfb33
1 changed files with 8 additions and 2 deletions
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10
ethcore/src/machine.rs
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@ -122,7 +122,13 @@ impl EthereumMachine {
}
impl EthereumMachine {
/// Execute a call as the system address.
/// Execute a call as the system address. Block environment information passed to the
/// VM is modified to have its gas limit bounded at the upper limit of possible used
/// gases including this system call, capped at the maximum value able to be
/// represented by U256. This system call modifies the block state, but discards other
/// information. If suicides, logs or refunds happen within the system call, they
/// will not be executed or recorded. Gas used by this system call will not be counted
/// on the block.
pub fn execute_as_system(
&self,
block: &mut ExecutedBlock,
@ -132,7 +138,7 @@ impl EthereumMachine {
) -> Result<Vec<u8>, Error> {
let env_info = {
let mut env_info = block.env_info();
env_info.gas_limit = env_info.gas_used + gas;
env_info.gas_limit = env_info.gas_used.saturating_add(gas);
env_info
};