xahaud/src/Interpreter.cpp

#include "Interpreter.h"
#include "Operation.h"
#include "Config.h"

/*
We also need to charge for each op

*/

namespace Script {

Interpreter::Interpreter()
{
	mContract=NULL;
	mCode=NULL;
	mInstructionPointer=0;
	mTotalFee=0;

	mInBlock=false;
	mBlockSuccess=true;
	mBlockJump=0;

	mFunctionTable.resize(NUM_OF_OPS);
	
	mFunctionTable[INT_OP]=new IntOp();
	mFunctionTable[FLOAT_OP]=new FloatOp();
	mFunctionTable[UINT160_OP]=new Uint160Op();
	mFunctionTable[BOOL_OP]=new Uint160Op();
	mFunctionTable[PATH_OP]=new Uint160Op();

	mFunctionTable[ADD_OP]=new AddOp();
	mFunctionTable[SUB_OP]=new SubOp();
	mFunctionTable[MUL_OP]=new MulOp();
	mFunctionTable[DIV_OP]=new DivOp();
	mFunctionTable[MOD_OP]=new ModOp();
	mFunctionTable[GTR_OP]=new GtrOp();
	mFunctionTable[LESS_OP]=new LessOp();
	mFunctionTable[EQUAL_OP]=new SubOp();
	mFunctionTable[NOT_EQUAL_OP]=new SubOp();
	mFunctionTable[AND_OP]=new SubOp();
	mFunctionTable[OR_OP]=new SubOp();
	mFunctionTable[NOT_OP]=new SubOp();
	mFunctionTable[JUMP_OP]=new SubOp();
	mFunctionTable[JUMPIF_OP]=new SubOp();
	mFunctionTable[STOP_OP]=new SubOp();
	mFunctionTable[CANCEL_OP]=new SubOp();
	mFunctionTable[BLOCK_OP]=new SubOp();
	mFunctionTable[BLOCK_END_OP]=new SubOp();
	mFunctionTable[SEND_XRP_OP]=new SendXRPOp();
	/*
	mFunctionTable[SEND_OP]=new SendOp();
	mFunctionTable[REMOVE_CONTRACT_OP]=new SubOp();
	mFunctionTable[FEE_OP]=new SubOp();
	mFunctionTable[CHANGE_CONTRACT_OWNER_OP]=new SubOp();
	mFunctionTable[STOP_REMOVE_OP]=new SubOp();
	mFunctionTable[SET_DATA_OP]=new SubOp();
	mFunctionTable[GET_DATA_OP]=new SubOp();
	mFunctionTable[GET_NUM_DATA_OP]=new SubOp();
	mFunctionTable[SET_REGISTER_OP]=new SubOp();
	mFunctionTable[GET_REGISTER_OP]=new SubOp();
	mFunctionTable[GET_ISSUER_ID_OP]=new SubOp();
	mFunctionTable[GET_OWNER_ID_OP]=new SubOp();
	mFunctionTable[GET_LEDGER_TIME_OP]=new SubOp();
	mFunctionTable[GET_LEDGER_NUM_OP]=new SubOp();
	mFunctionTable[GET_RAND_FLOAT_OP]=new SubOp();
	mFunctionTable[GET_XRP_ESCROWED_OP]=new SubOp();
	mFunctionTable[GET_RIPPLE_ESCROWED_OP]=new SubOp();
	mFunctionTable[GET_RIPPLE_ESCROWED_CURRENCY_OP]=new SubOp();
	mFunctionTable[GET_RIPPLE_ESCROWED_ISSUER]=new GetRippleEscrowedIssuerOp();
	mFunctionTable[GET_ACCEPT_DATA_OP]=new AcceptDataOp();
	mFunctionTable[GET_ACCEPTOR_ID_OP]=new GetAcceptorIDOp();
	mFunctionTable[GET_CONTRACT_ID_OP]=new GetContractIDOp();
	*/
	
}

Data::pointer Interpreter::popStack()
{
	if(mStack.size())
	{
		Data::pointer item=mStack[mStack.size()-1];
		mStack.pop_back();
		return(item);
	}else
	{
		return(Data::pointer(new ErrorData()));
	}
}

void Interpreter::pushStack(Data::pointer data)
{
	mStack.push_back(data);
}


// offset is where to jump to if the block fails
bool Interpreter::startBlock(int offset)
{
	if(mInBlock) return(false); // can't nest blocks
	mBlockSuccess=true;
	mInBlock=true;
	mBlockJump=offset+mInstructionPointer;
	return(true);
}

bool Interpreter::endBlock()
{
	if(!mInBlock) return(false);
	mInBlock=false;
	mBlockJump=0;
	pushStack(Data::pointer(new BoolData(mBlockSuccess)));
	return(true);
}

TER Interpreter::interpret(Contract* contract,const SerializedTransaction& txn,std::vector<unsigned char>& code)
{
	mContract=contract;
	mCode=&code;
	mTotalFee=0;
	mInstructionPointer=0;
	while(mInstructionPointer<code.size())
	{
		unsigned int fun=(*mCode)[mInstructionPointer];
		mInstructionPointer++;

		if(fun>=mFunctionTable.size()) 
		{
			// TODO: log
			return(temMALFORMED);  // TODO: is this actually what we want to do?
		}

		mTotalFee += mFunctionTable[ fun ]->getFee();
		if(mTotalFee>txn.getTransactionFee().getNValue())
		{
			// TODO: log
			return(telINSUF_FEE_P);
		}else 
		{
			if(!mFunctionTable[ fun ]->work(this))
			{
				// TODO: log
				return(temMALFORMED);  // TODO: is this actually what we want to do?
			}
		}
	}
	return(tesSUCCESS);
}


Data::pointer Interpreter::getIntData()
{
	int value=0; // TODO
	mInstructionPointer += 4;
	return(Data::pointer(new IntData(value)));
}

Data::pointer Interpreter::getFloatData()
{
	float value=0; // TODO
	mInstructionPointer += 4;
	return(Data::pointer(new FloatData(value)));
}

Data::pointer Interpreter::getUint160Data()
{
	uint160 value; // TODO
	mInstructionPointer += 20;
	return(Data::pointer(new Uint160Data(value)));
}



bool Interpreter::jumpTo(int offset)
{
	mInstructionPointer += offset;
	if( (mInstructionPointer<0) || (mInstructionPointer>mCode->size()) )
	{
		mInstructionPointer -= offset;
		return(false);
	}
	return(true);
}

void Interpreter::stop()
{
	mInstructionPointer=mCode->size();
}

Data::pointer Interpreter::getContractData(int index)
{
	return(Data::pointer(new ErrorData()));
}

bool Interpreter::canSign(const uint160& signer)
{
	return(true);
}




} // end namespace