linera_witty/runtime/
error.rs

1// Copyright (c) Zefchain Labs, Inc.
2// SPDX-License-Identifier: Apache-2.0
3
4//! Common error type for usage of different Wasm runtimes.
5
6use std::{num::TryFromIntError, string::FromUtf8Error};
7
8use thiserror::Error;
9
10/// Errors that can occur when using a Wasm runtime.
11#[derive(Debug, Error)]
12pub enum RuntimeError {
13    /// Attempt to allocate a buffer larger than `i32::MAX`.
14    #[error("Requested allocation size is too large")]
15    AllocationTooLarge,
16
17    /// Call to `cabi_realloc` returned a negative value instead of a valid address.
18    #[error("Memory allocation failed")]
19    AllocationFailed,
20
21    /// Attempt to deallocate an address that's after `i32::MAX`.
22    #[error("Attempt to deallocate an invalid address")]
23    DeallocateInvalidAddress,
24
25    /// Attempt to load a function not exported from a module.
26    #[error("Function `{_0}` could not be found in the module's exports")]
27    FunctionNotFound(String),
28
29    /// Attempt to load a function with a name that's used for a different import in the module.
30    #[error("Export `{_0}` is not a function")]
31    NotAFunction(String),
32
33    /// Attempt to load the memory export from a module that doesn't export it.
34    #[error("Failed to load `memory` export")]
35    MissingMemory,
36
37    /// Attempt to load the memory export from a module that exports it as something else.
38    #[error("Unexpected type for `memory` export")]
39    NotMemory,
40
41    /// Attempt to load a string from a sequence of bytes that doesn't contain a UTF-8 string.
42    #[error("Failed to load string from non-UTF-8 bytes")]
43    InvalidString(#[from] FromUtf8Error),
44
45    /// Attempt to create a `GuestPointer` from an invalid address representation.
46    #[error("Invalid address read")]
47    InvalidNumber(#[from] TryFromIntError),
48
49    /// Attempt to load an `enum` type but the discriminant doesn't match any of the variants.
50    #[error("Unexpected variant discriminant {discriminant} for `{type_name}`")]
51    InvalidVariant {
52        /// The `enum` type that failed being loaded.
53        type_name: &'static str,
54        /// The invalid discriminant that was received.
55        discriminant: i64,
56    },
57
58    /// A custom error reported by one of the Wasm host's function handlers.
59    #[error("Error reported by host function handler: {_0}")]
60    Custom(#[source] anyhow::Error),
61
62    /// Wasmer runtime error.
63    #[cfg(with_wasmer)]
64    #[error(transparent)]
65    Wasmer(#[from] wasmer::RuntimeError),
66
67    /// Attempt to access an invalid memory address using Wasmer.
68    #[cfg(with_wasmer)]
69    #[error(transparent)]
70    WasmerMemory(#[from] wasmer::MemoryAccessError),
71
72    /// Wasmtime error.
73    #[cfg(with_wasmtime)]
74    #[error(transparent)]
75    Wasmtime(anyhow::Error),
76
77    /// Wasmtime trap during execution.
78    #[cfg(with_wasmtime)]
79    #[error(transparent)]
80    WasmtimeTrap(#[from] wasmtime::Trap),
81}
linera_witty/runtime/error.rs

linera_witty/runtime/
error.rs
