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
// This file is part of Substrate.

// Copyright (C) 2017-2021 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

//! Rust executor possible errors.

use sp_serializer;
use wasmi;

/// Result type alias.
pub type Result<T> = std::result::Result<T, Error>;

/// Error type.
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
	#[error("Unserializable data encountered")]
	InvalidData(#[from] sp_serializer::Error),

	#[error(transparent)]
	Trap(#[from] wasmi::Trap),

	#[error(transparent)]
	Wasmi(#[from] wasmi::Error),

	#[error("Error calling api function: {0}")]
	ApiError(Box<dyn std::error::Error + Send + Sync>),

	#[error("Method not found: '{0}'")]
	MethodNotFound(String),

	#[error("Invalid Code (expected single byte): '{0}'")]
	InvalidCode(String),

	#[error("On-chain runtime does not specify version")]
	VersionInvalid,

	#[error("Externalities error")]
	Externalities,

	#[error("Invalid index provided")]
	InvalidIndex,

	#[error("Invalid type returned (should be u64)")]
	InvalidReturn,

	#[error("Runtime error")]
	Runtime,

	#[error("Runtime panicked: {0}")]
	RuntimePanicked(String),

	#[error("Invalid memory reference")]
	InvalidMemoryReference,

	#[error("The runtime doesn't provide a global named `__heap_base` of type `i32`")]
	HeapBaseNotFoundOrInvalid,

	#[error("The runtime must not have the `start` function defined")]
	RuntimeHasStartFn,

	#[error("Other: {0}")]
	Other(String),

	#[error(transparent)]
	Allocator(#[from] sp_allocator::Error),

	#[error("Host function {0} execution failed with: {1}")]
	FunctionExecution(String, String),

	#[error("No table exported by wasm blob")]
	NoTable,

	#[error("No table entry with index {0} in wasm blob exported table")]
	NoTableEntryWithIndex(u32),

	#[error("Table element with index {0} is not a function in wasm blob exported table")]
	TableElementIsNotAFunction(u32),

	#[error("Table entry with index {0} in wasm blob is null")]
	FunctionRefIsNull(u32),

	#[error(transparent)]
	RuntimeConstruction(#[from] WasmError),

	#[error("Shared memory is not supported")]
	SharedMemUnsupported,

	#[error("Imported globals are not supported yet")]
	ImportedGlobalsUnsupported,

	#[error("initializer expression can have only up to 2 expressions in wasm 1.0")]
	InitializerHasTooManyExpressions,

	#[error("Invalid initializer expression provided {0}")]
	InvalidInitializerExpression(String),
}

impl wasmi::HostError for Error {}

impl From<&'static str> for Error {
	fn from(err: &'static str) -> Error {
		Error::Other(err.into())
	}
}

impl From<String> for Error {
	fn from(err: String) -> Error {
		Error::Other(err)
	}
}

/// Type for errors occurring during Wasm runtime construction.
#[derive(Debug, derive_more::Display)]
pub enum WasmError {
	/// Code could not be read from the state.
	CodeNotFound,
	/// Failure to reinitialize runtime instance from snapshot.
	ApplySnapshotFailed,
	/// Failure to erase the wasm memory.
	///
	/// Depending on the implementation might mean failure of allocating memory.
	ErasingFailed(String),
	/// Wasm code failed validation.
	InvalidModule,
	/// Wasm code could not be deserialized.
	CantDeserializeWasm,
	/// The module does not export a linear memory named `memory`.
	InvalidMemory,
	/// The number of heap pages requested is disallowed by the module.
	InvalidHeapPages,
	/// Instantiation error.
	Instantiation(String),
	/// Other error happenend.
	Other(String),
}

impl std::error::Error for WasmError {}