/**
* That method implement internal calls and code invocations
*
* @param gas - gas to pay for the call, remaining gas will be refunded to the caller
* @param toAddressDW - address to call
* @param endowmentValue - the value that can be transfer along with the code execution
* @param inDataOffs - start of memory to be input data to the call
* @param inDataSize - size of memory to be input data to the call
* @param outDataOffs - start of memory to be output of the call
* @param outDataSize - size of memory to be output data to the call
*/
public void callToAddress(
DataWord gas,
DataWord toAddressDW,
DataWord endowmentValue,
DataWord inDataOffs,
DataWord inDataSize,
DataWord outDataOffs,
DataWord outDataSize) {
ByteBuffer data = memoryChunk(inDataOffs, inDataSize);
// FETCH THE SAVED STORAGE
byte[] toAddress = toAddressDW.getLast20Bytes();
// FETCH THE CODE
byte[] programCode = this.result.getRepository().getCode(toAddress);
if (logger.isInfoEnabled())
logger.info(
"calling for existing contract: address: [ {} ], outDataOffs: [ {} ], outDataSize: [ {} ] ",
Hex.toHexString(toAddress),
outDataOffs.longValue(),
outDataSize.longValue());
byte[] senderAddress = this.getOwnerAddress().getLast20Bytes();
// 2.1 PERFORM THE GAS VALUE TX
// (THIS STAGE IS NOT REVERTED BY ANY EXCEPTION)
if (this.getGas().longValue() - gas.longValue() < 0) {
logger.info(
"No gas for the internal call, \n" + "fromAddress={}, toAddress={}",
Hex.toHexString(senderAddress),
Hex.toHexString(toAddress));
this.stackPushZero();
return;
}
BigInteger endowment = endowmentValue.value();
BigInteger senderBalance = result.getRepository().getBalance(senderAddress);
if (senderBalance.compareTo(endowment) < 0) {
stackPushZero();
return;
}
result.getRepository().addBalance(senderAddress, endowment.negate());
if (invokeData.byTestingSuite()) {
logger.info("[testing suite] - omit real call");
stackPushOne();
this.getResult()
.addCallCreate(
data.array(),
toAddressDW.getLast20Bytes(),
gas.getNoLeadZeroesData(),
endowmentValue.getNoLeadZeroesData());
return;
}
// actual gas subtract
this.spendGas(gas.intValue(), "internal call");
RepositoryImpl trackRepositoryImpl = result.getRepository().getTrack();
trackRepositoryImpl.startTracking();
trackRepositoryImpl.addBalance(toAddress, endowmentValue.value());
ProgramInvoke programInvoke =
ProgramInvokeFactory.createProgramInvoke(
this,
toAddressDW,
endowmentValue,
gas,
result.getRepository().getBalance(toAddress),
data.array(),
trackRepositoryImpl,
this.invokeData.getCallDeep() + 1);
ProgramResult result = null;
if (programCode != null && programCode.length != 0) {
VM vm = new VM();
Program program = new Program(programCode, programInvoke);
vm.play(program);
result = program.getResult();
this.result.addDeleteAccounts(result.getDeleteAccounts());
}
if (result != null
&& result.getException() != null
&& result.getException() instanceof Program.OutOfGasException) {
logger.info("contract run halted by OutOfGas: contract={}", Hex.toHexString(toAddress));
trackRepositoryImpl.rollback();
stackPushZero();
return;
}
// 3. APPLY RESULTS: result.getHReturn() into out_memory allocated
if (result != null) {
ByteBuffer buffer = result.getHReturn();
int allocSize = outDataSize.intValue();
if (buffer != null && allocSize > 0) {
int retSize = buffer.limit();
int offset = outDataOffs.intValue();
if (retSize > allocSize) {
this.memorySave(offset, buffer.array());
} else {
this.memorySave(offset, allocSize, buffer.array());
}
}
}
// 4. THE FLAG OF SUCCESS IS ONE PUSHED INTO THE STACK
trackRepositoryImpl.commit();
stackPushOne();
// 5. REFUND THE REMAIN GAS
if (result != null) {
BigInteger refundGas = gas.value().subtract(BigInteger.valueOf(result.getGasUsed()));
if (refundGas.compareTo(BigInteger.ZERO) == 1) {
this.refundGas(refundGas.intValue(), "remaining gas from the internal call");
logger.info(
"The remaining gas refunded, account: [ {} ], gas: [ {} ] ",
Hex.toHexString(senderAddress),
refundGas.toString());
}
} else {
this.refundGas(gas.intValue(), "remaining gas from the internal call");
}
}
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);
}
}
}