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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)]
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,
}