public override void Execute()
{
// Obtain our offsets and sizes for the copy.
BigInteger memoryOffset = Stack.Pop();
BigInteger dataOffset = Stack.Pop();
BigInteger dataSize = Stack.Pop();
// This is considered a copy operation, so we charge for the size of the data.
GasState.Deduct(GasDefinitions.GetMemoryCopyCost(Version, dataSize));
// Read our data from the code segment (if our offset is wrong or we hit the end of the array, the rest should be zeroes).
byte[] data = new byte[(int)dataSize];
int length = data.Length;
if (dataOffset > EVM.Code.Length)
{
dataOffset = 0;
length = 0;
}
else if (dataOffset + length > EVM.Code.Length)
{
length = EVM.Code.Length - (int)dataOffset;
}
// Copy to the memory location.
EVM.Code.Slice((int)dataOffset, length).CopyTo(data);
// Write the data to our given memory offset.
Memory.Write((long)memoryOffset, data);
}
public override void Execute()
{
// Obtain our offsets and sizes for the copy.
BigInteger memoryOffset = Stack.Pop();
BigInteger dataOffset = Stack.Pop();
BigInteger dataSize = Stack.Pop();
// This is considered a copy operation, so we charge for the size of the data.
GasState.Deduct(GasDefinitions.GetMemoryCopyCost(Version, dataSize));
// If we aren't copying anything, we can stop.
if (dataOffset + dataSize == 0)
{
return;
}
// Check we have a return result, and check it's bounds.
if (ExecutionState.LastCallResult?.ReturnData == null)
{
throw new EVMException($"{Opcode.ToString()} tried to copy return data from last call, but no last return data exists.");
}
else if (dataOffset + dataSize > (ExecutionState.LastCallResult?.ReturnData.Length ?? 0))
{
throw new EVMException($"{Opcode.ToString()} tried to copy return data past the end.");
}
else
{
// Otherwise we write our data we wish to copy to memory.
Memory.Write((long)memoryOffset, ExecutionState.LastCallResult.ReturnData.Slice((int)dataOffset, (int)(dataSize)).ToArray());
}
}
