public void createContract(DataWord value, DataWord memStart, DataWord memSize) {
if (invokeData.byTestingSuite()) {
logger.info("[testing suite] - omit real create");
return;
}
// [1] FETCH THE CODE FROM THE MEMORY
ByteBuffer programCode = memoryChunk(memStart, memSize);
byte[] senderAddress = this.getOwnerAddress().getLast20Bytes();
if (logger.isInfoEnabled())
logger.info(
"creating a new contract inside contract run: [{}]", Hex.toHexString(senderAddress));
// actual gas subtract
int gas = this.getGas().intValue();
this.spendGas(gas, "internal call");
// [2] CREATE THE CONTRACT ADDRESS
byte[] nonce = result.getRepository().getNonce(senderAddress).toByteArray();
byte[] newAddress = HashUtil.calcNewAddr(this.getOwnerAddress().getLast20Bytes(), nonce);
result.getRepository().createAccount(newAddress);
// [3] UPDATE THE NONCE
// (THIS STAGE IS NOT REVERTED BY ANY EXCEPTION)
result.getRepository().increaseNonce(senderAddress);
// [4] TRANSFER THE BALANCE
BigInteger endowment = value.value();
BigInteger senderBalance = result.getRepository().getBalance(senderAddress);
if (senderBalance.compareTo(endowment) < 0) {
stackPushZero();
return;
}
result.getRepository().addBalance(senderAddress, endowment.negate());
result.getRepository().addBalance(newAddress, endowment);
RepositoryImpl trackRepositoryImpl = result.getRepository().getTrack();
trackRepositoryImpl.startTracking();
// [5] COOK THE INVOKE AND EXECUTE
ProgramInvoke programInvoke =
ProgramInvokeFactory.createProgramInvoke(
this,
new DataWord(newAddress),
DataWord.ZERO,
new DataWord(gas),
BigInteger.ZERO,
null,
trackRepositoryImpl,
this.invokeData.getCallDeep() + 1);
VM vm = new VM();
Program program = new Program(programCode.array(), programInvoke);
vm.play(program);
ProgramResult result = program.getResult();
this.result.addDeleteAccounts(result.getDeleteAccounts());
if (result.getException() != null
&& result.getException() instanceof Program.OutOfGasException) {
logger.info(
"contract run halted by OutOfGas: new contract init ={}", Hex.toHexString(newAddress));
trackRepositoryImpl.rollback();
stackPushZero();
return;
}
// 4. CREATE THE CONTRACT OUT OF RETURN
byte[] code = result.getHReturn().array();
trackRepositoryImpl.saveCode(newAddress, code);
// IN SUCCESS PUSH THE ADDRESS INTO THE STACK
stackPush(new DataWord(newAddress));
trackRepositoryImpl.commit();
// 5. REFUND THE REMAIN GAS
long refundGas = gas - result.getGasUsed();
if (refundGas > 0) {
this.refundGas(refundGas, "remain gas from the internal call");
if (logger.isInfoEnabled()) {
logger.info(
"The remaining gas is refunded, account: [ {} ], gas: [ {} ] ",
Hex.toHexString(this.getOwnerAddress().getLast20Bytes()),
refundGas);
}
}
}
