pepyakin

We need to have risc0 available in docker containers. Modern macs are aarch64 machines. When you run docker on mac, a aarch64 VM will be used. It's possible to use x86-64, but those would run slower.

Unfortunately, risc0 binaries are not built for aarch64 linux. risc0/risc0#1286

There are two general approaches that I found.

Qemu system emulation

It's possible to use qemu for system emulation. I managed to build both on macOS and on nixOS.

pepyakin

import { ApiPromise, WsProvider, Keyring } from '@polkadot/api'
import { cryptoWaitReady } from '@polkadot/util-crypto'
import { readFileSync } from 'fs';

async function connect(port, types) {
	const provider = new WsProvider('ws://127.0.0.1:' + port)
	const api = new ApiPromise({ provider, types })
	await api.isReady
	return api
}

pepyakin

1. Build master of polkadot with cargo build --release --features real-overseer
2. Build master of cumulus with cargo build --release -p rococo-collator
3. Update the config above so that paths point to proper locations
4. Take polkadot-launch of d9b6708e5175244aa5c83685aa5d0633b837a1fe (or master should be fine really)
5. Run with RUST_LOG=parachains_runtime_inclusion=trace,candidate_backing=trace,collation_generation=trace,candidate_selection=trace,runtime=debug npm run start launch-hrmp.json

pepyakin

use std::cell::UnsafeCell;

#[test]
fn evil() {
    let array: [u8; 2] = [b'A', b'B'];
    let array = UnsafeCell::new(array);

    let (_loaded_a, _loaded_b) = unsafe {
        let a = &mut *{
            let cached_entries = &mut *array.get();

pepyakin

# Put this file in the root of substrate / polkadot directory and build the image using	
# the following command:	
#	
#     docker build -t <container id> .	
#	
# you can pick <container id> yourself. For example: `johndoe/rpi-cross`.	
#	

FROM rust:latest

pepyakin

// Copyright 2018 Parity Technologies (UK) Ltd.
// This file is part of Substrate.

// Substrate 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.

// Substrate is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of

pepyakin

When one try to run wasm-reduce on macOS machine, they will see something like this:

wasm-reduce -v -f \
	--timeout=15 \
	--command="./predicate.sh" \
	--test=test.wasm \
	--working=working.wasm \
	~/Downloads/wasm-collection-master/misc-valid/cv-wasm.wasm

pepyakin

(module
  (import "proxy" "execute_block"
    (func $execute_block (param i32 i32) (result i64))
  )

  (global $ret_hi (mut i32) (i32.const 0))
  (global $ret_lo (mut i32) (i32.const 0))

  (func (export "returnHi") (result i32) (get_global $ret_hi))
  (func (export "returnLo") (result i32) (get_global $ret_lo))

pepyakin

(module (func (export "test") (result i32)
    (block (result i32)
      i32.const 0
      i32.const 0
      br_if 0
      i32.const 0
    )
  )
)

pepyakin

(module (func (export "test") (result i32)
    (block (result i32)
      (unreachable) (br_if 0 (i32.const 0) (i32.const 0)) (i32.const 0)
    )
  )
)