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use std::fmt; #[derive(Debug, Clone, PartialEq, Eq)] pub enum TrapKind { InvalidFunctionAddr, Unreachable, MemoryAccessOutOfBounds, TableAccessOutOfBounds, ElemUninitialized, DivisionByZero, InvalidConversionToInt, StackOverflow, UnexpectedSignature, } pub type Trap<T, K = TrapKind> = std::result::Result<T, K>; #[derive(Debug, Clone)] pub enum Error { FuncNotFound, FuncExists, ModuleNotFound, ModuleExists, ParseError(parity_wasm::SerializationError), ValidationError(String), RuntimeError(TrapKind), } pub type Result<T, E = Error> = std::result::Result<T, E>; impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match self { Error::FuncNotFound => write!(f, "function not found"), Error::FuncExists => write!(f, "function already exists"), Error::ModuleNotFound => write!(f, "module not found"), Error::ModuleExists => write!(f, "module already exists"), Error::ParseError(e) => write!(f, "failed to parse wasm: {}", e), Error::ValidationError(e) => write!(f, "failed to validate wasm: {}", e), Error::RuntimeError(trap) => write!(f, "runtime trap: {:?}", trap), } } } impl std::error::Error for Error { } impl From<TrapKind> for Error { fn from(trap: TrapKind) -> Self { Error::RuntimeError(trap) } } impl From<parity_wasm::SerializationError> for Error { fn from(error: parity_wasm::SerializationError) -> Self { Error::ParseError(error) } } impl From<bwasm::LoadError> for Error { fn from(error: bwasm::LoadError) -> Self { match error { bwasm::LoadError::SerializationError(error) => Error::ParseError(error), bwasm::LoadError::ValidationError(error) => Error::ValidationError(format!("{}", error)), } } }