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    // Copyright 2015-2017 Parity Technologies (UK) Ltd.
    // This file is part of Parity.

    // Parity is free software: you can redistribute it and/or modify
    // it under the terms of the GNU General Public License as published by
    // the Free Software Foundation, either version 3 of the License, or
    // (at your option) any later version.

    // Parity is distributed in the hope that it will be useful,
    // but WITHOUT ANY WARRANTY; without even the implied warranty of
    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    // GNU General Public License for more details.

    // You should have received a copy of the GNU General Public License
    // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

    //! Trace errors.

    use std::fmt;
    use rlp::{Encodable, RlpStream, Decodable, Decoder, DecoderError, Stream, View};
    use evm::Error as EvmError;

    /// Trace evm errors.
    #[derive(Debug, PartialEq, Clone)]
    #[cfg_attr(feature = "ipc", binary)]
    pub enum Error {
    	/// `OutOfGas` is returned when transaction execution runs out of gas.
    	OutOfGas,
    	/// `BadJumpDestination` is returned when execution tried to move
    	/// to position that wasn't marked with JUMPDEST instruction
    	BadJumpDestination,
    	/// `BadInstructions` is returned when given instruction is not supported
    	BadInstruction,
    	/// `StackUnderflow` when there is not enough stack elements to execute instruction
    	StackUnderflow,
    	/// When execution would exceed defined Stack Limit
    	OutOfStack,
    	/// Returned on evm internal error. Should never be ignored during development.
    	/// Likely to cause consensus issues.
    	Internal,
    }

    impl From<EvmError> for Error {
    	fn from(e: EvmError) -> Self {
    		match e {
    			EvmError::OutOfGas => Error::OutOfGas,
    			EvmError::BadJumpDestination { .. } => Error::BadJumpDestination,
    			EvmError::BadInstruction { .. } => Error::BadInstruction,
    			EvmError::StackUnderflow { .. } => Error::StackUnderflow,
    			EvmError::OutOfStack { .. } => Error::OutOfStack,
    			EvmError::Internal => Error::Internal,
    		}
    	}
    }

    impl fmt::Display for Error {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		use self::Error::*;
    		let message = match *self {
    			OutOfGas => "Out of gas",
    			BadJumpDestination => "Bad jump destination",
    			BadInstruction => "Bad instruction",
    			StackUnderflow => "Stack underflow",
    			OutOfStack => "Out of stack",
    			Internal => "Internal error",
    		};
    		message.fmt(f)
    	}
    }

    impl Encodable for Error {
    	fn rlp_append(&self, s: &mut RlpStream) {
    		use self::Error::*;
    		let value = match *self {
    			OutOfGas => 0u8,
    			BadJumpDestination => 1,
    			BadInstruction => 2,
    			StackUnderflow => 3,
    			OutOfStack => 4,
    			Internal => 5,
    		};
    		s.append(&value);
    	}
    }

    impl Decodable for Error {
    	fn decode<D>(decoder: &D) -> Result<Self, DecoderError> where D: Decoder {
    		use self::Error::*;
    		let value: u8 = decoder.as_rlp().as_val()?;
    		match value {
    			0 => Ok(OutOfGas),
    			1 => Ok(BadJumpDestination),
    			2 => Ok(BadInstruction),
    			3 => Ok(StackUnderflow),
    			4 => Ok(OutOfStack),
    			5 => Ok(Internal),
    			_ => Err(DecoderError::Custom("Invalid error type")),
    		}
    	}
    }

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