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//! VM errors

use bigint::{Address, U256};

#[derive(Debug, Clone)]
/// Errors when trying to validate the transaction.
pub enum PreExecutionError {
    /// The caller is invalid.
    InvalidCaller,
    /// Nonce of the caller does not equal.
    InvalidNonce,
    /// Balance from the caller is insufficient.
    InsufficientBalance,
    /// Gas limit is smaller than the intrinsic gas required.
    InsufficientGasLimit,
}

#[derive(Debug, Clone)]
/// Errors returned by an EVM memory.
pub enum MemoryError {
    /// The index is too large for the implementation of the VM to
    /// handle.
    IndexNotSupported,
}

impl From<MemoryError> for MachineError {
    fn from(val: MemoryError) -> MachineError {
        MachineError::Memory(val)
    }
}

impl From<MemoryError> for EvalError {
    fn from(val: MemoryError) -> EvalError {
        EvalError::Machine(MachineError::Memory(val))
    }
}

#[derive(Debug, Clone)]
/// Errors returned by an EVM stack.
pub enum StackError {
    /// Stack is overflowed (pushed more than 1024 items to the
    /// stack).
    Overflow,
    /// Stack is underflowed (poped an empty stack).
    Underflow,
}

impl From<StackError> for EvalError {
    fn from(val: StackError) -> EvalError {
        EvalError::Machine(MachineError::Stack(val))
    }
}

#[derive(Debug, Clone)]
/// Errors returned by an EVM PC.
pub enum PCError {
    /// The opcode is invalid and the PC is not able to convert it to
    /// an instruction.
    InvalidOpcode,
    /// The index is too large for the implementation of the VM to
    /// handle.
    IndexNotSupported,
    /// PC jumped to an invalid jump destination.
    BadJumpDest,
    /// PC overflowed (tries to read the next opcode which is already
    /// the end of the code).
    Overflow,
}

impl From<PCError> for EvalError {
    fn from(val: PCError) -> EvalError {
        EvalError::Machine(MachineError::PC(val))
    }
}

#[derive(Debug, Clone)]
/// Errors returned when trying to step the instruction.
pub enum EvalError {
    /// A runtime error. Non-recoverable.
    Machine(MachineError),
    /// The VM requires account of blockhash information to be
    /// committed. Recoverable after the required information is
    /// committed.
    Require(RequireError),
}

#[derive(Debug, Clone)]
/// Errors returned by the a single machine of the VM.
pub enum MachineError {
    /// VM memory error.
    Memory(MemoryError),
    /// VM stack error.
    Stack(StackError),
    /// VM PC error.
    PC(PCError),

    /// For instruction that requires reading a range, it is invalid.
    InvalidRange,
    /// Not enough gas to continue.
    EmptyGas,
}

impl From<MachineError> for EvalError {
    fn from(val: MachineError) -> EvalError {
        EvalError::Machine(val)
    }
}

#[derive(Debug, Clone)]
/// Errors stating that the VM requires additional information to
/// continue running.
pub enum RequireError {
    /// Requires the account at address for the VM to continue
    /// running, this should usually be dealt by
    /// `vm.commit_account(AccountCommitment::Full { .. })` or
    /// `vm.commit_account(AccountCommitment::Nonexist(..))`.
    Account(Address),
    /// Requires the account code at address for the VM to continue
    /// running, this should usually be dealt by
    /// `vm.commit_account(AccountCommitment::Code { .. })`.
    AccountCode(Address),
    /// Requires the current value of the storage for the VM to
    /// continue running, this should usually be dealt by
    /// `vm.commit_account(AccountCommitment::Storage { .. }`.
    AccountStorage(Address, U256),
    /// Requires the blockhash for the VM to continue running, this
    /// should usually be dealt by `vm.commit_blockhash(..)`.
    Blockhash(U256),
}

impl From<RequireError> for EvalError {
    fn from(val: RequireError) -> EvalError {
        EvalError::Require(val)
    }
}

#[derive(Debug, Clone)]
/// Errors returned when committing a new information.
pub enum CommitError {
    /// The commitment is invalid.
    InvalidCommitment,
    /// The commitment has already been committed.
    AlreadyCommitted,
}