add babe primitive

client/allocator/Cargo.toml

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+[package]
+name = "sc-allocator"
+version = "4.1.0-dev"
+authors = ["Parity Technologies <[email protected]>"]
+edition = "2021"
+license = "Apache-2.0"
+homepage = "https://substrate.io"
+repository = "https://github.com/paritytech/substrate/"
+description = "Collection of allocator implementations."
+documentation = "https://docs.rs/sc-allocator"
+readme = "README.md"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+log = "0.4.17"
+thiserror = "1.0.30"
+sp-core = { version = "21.0.0", path = "../../primitives/core" }
+sp-wasm-interface = { version = "14.0.0", path = "../../primitives/wasm-interface" }

client/allocator/README.md

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+Collection of allocator implementations.
+
+This crate provides the following allocator implementations:
+- A freeing-bump allocator: [`FreeingBumpHeapAllocator`](https://docs.rs/sc-allocator/latest/sc_allocator/struct.FreeingBumpHeapAllocator.html)
+
+License: Apache-2.0

client/allocator/src/error.rs

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+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// The error type used by the allocators.
+#[derive(thiserror::Error, Debug, PartialEq)]
+pub enum Error {
+	/// Someone tried to allocate more memory than the allowed maximum per allocation.
+	#[error("Requested allocation size is too large")]
+	RequestedAllocationTooLarge,
+	/// Allocator run out of space.
+	#[error("Allocator ran out of space")]
+	AllocatorOutOfSpace,
+	/// The client passed a memory instance which is smaller than previously observed.
+	#[error("Shrinking of the underlying memory is observed")]
+	MemoryShrinked,
+	/// Some other error occurred.
+	#[error("Other: {0}")]
+	Other(&'static str),
+}