1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164

//! 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)]
pub enum OnChainError {
    /// Stack is overflowed (pushed more than 1024 items to the
    /// stack).
    StackOverflow,
    /// Stack is underflowed (poped an empty stack).
    StackUnderflow,
    /// The opcode is invalid and the PC is not able to convert it to
    /// an instruction.
    InvalidOpcode,
    /// PC jumped to an invalid jump destination.
    BadJumpDest,
    /// PC overflowed (tries to read the next opcode which is already
    /// the end of the code). In Yellow Paper, this is categorized the
    /// same as InvalidOpcode.
    PCOverflow,
    /// Not enough gas to continue.
    EmptyGas,
    /// For instruction that requires reading a range, it is
    /// invalid. This in the Yellow Paper is covered by EmptyGas.
    InvalidRange,
}

impl From<OnChainError> for RuntimeError {
    fn from(val: OnChainError) -> RuntimeError {
        RuntimeError::OnChain(val)
    }
}

impl From<OnChainError> for EvalOnChainError {
    fn from(val: OnChainError) -> EvalOnChainError {
        EvalOnChainError::OnChain(val)
    }
}

impl From<OnChainError> for EvalError {
    fn from(val: OnChainError) -> EvalError {
        EvalError::OnChain(val)
    }
}

#[derive(Debug, Clone)]
pub enum NotSupportedError {
    /// The memory index is too large for the implementation of the VM to
    /// handle.
    MemoryIndexNotSupported,
    /// A particular precompiled contract is not supported.
    PrecompiledNotSupported,
}

impl From<NotSupportedError> for RuntimeError {
    fn from(val: NotSupportedError) -> RuntimeError {
        RuntimeError::NotSupported(val)
    }
}

impl From<NotSupportedError> for EvalError {
    fn from(val: NotSupportedError) -> EvalError {
        EvalError::NotSupported(val)
    }
}

#[derive(Debug, Clone)]
pub enum RuntimeError {
    /// On chain error.
    OnChain(OnChainError),
    /// Off chain error due to VM not supported.
    NotSupported(NotSupportedError),
}

impl From<RuntimeError> for EvalError {
    fn from(val: RuntimeError) -> EvalError {
        match val {
            RuntimeError::OnChain(err) =>
                EvalError::OnChain(err),
            RuntimeError::NotSupported(err) =>
                EvalError::NotSupported(err),
        }
    }
}

#[derive(Debug, Clone)]
pub enum EvalOnChainError {
    OnChain(OnChainError),
    Require(RequireError),
}

impl From<EvalOnChainError> for EvalError {
    fn from(val: EvalOnChainError) -> EvalError {
        match val {
            EvalOnChainError::OnChain(err) =>
                EvalError::OnChain(err),
            EvalOnChainError::Require(err) =>
                EvalError::Require(err),
        }
    }
}

#[derive(Debug, Clone)]
pub enum EvalError {
    OnChain(OnChainError),
    NotSupported(NotSupportedError),
    Require(RequireError),
}

#[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)
    }
}

impl From<RequireError> for EvalOnChainError {
    fn from(val: RequireError) -> EvalOnChainError {
        EvalOnChainError::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,
}