Parachain validation moved to external process (#325)

* Improved execution & tests

* Style

* Made CLI arg const

* Moved Upwards message

* CLI subcommand for validation worker

* Build halting parachain

* Build halting parachain

* Made stuff private

* Reorganized parachain tests

* Comment

* Whitespace

* Apply suggestions from code review

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

* Fixed call data size check and introduced an enum

* Apply suggestions from code review

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

polkadot/test-parachains/adder/collator/src/main.rs

@@ -143,7 +143,6 @@ fn main() {
 		id,
 		exit,
 		key,
-		::std::env::args(),
 		VersionInfo {
 			name: "<unknown>",
 			version: "<unknown>",

polkadot/test-parachains/halt/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "halt"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+description = "Test parachain which executes forever"
+edition = "2018"
+build = "build.rs"
+
+[dependencies]
+
+[build-dependencies]
+wasm-builder-runner = { package = "substrate-wasm-builder-runner", version = "1.0.2" }
+
+[features]
+default = [ "std" ]
+no_std = []
+std = []

polkadot/test-parachains/halt/build.rs

@@ -0,0 +1,25 @@
+// Copyright 2019 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
+// 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 Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use wasm_builder_runner::{build_current_project_with_rustflags, WasmBuilderSource};
+
+fn main() {
+	build_current_project_with_rustflags(
+		"wasm_binary.rs",
+		WasmBuilderSource::Crates("1.0.4"),
+		"-C link-arg=--import-memory",
+	);
+}

polkadot/test-parachains/halt/src/lib.rs

@@ -0,0 +1,49 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot 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.
+
+// Polkadot 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 Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Basic parachain that executes forever.
+
+#![no_std]
+#![cfg_attr(feature = "no_std", feature(core_intrinsics, lang_items, core_panic_info, alloc_error_handler))]
+
+// Make the WASM binary available.
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+#[cfg(feature = "no_std")]
+#[panic_handler]
+#[no_mangle]
+pub fn panic(_info: &core::panic::PanicInfo) -> ! {
+	unsafe {
+		core::intrinsics::abort()
+	}
+}
+
+#[cfg(feature = "no_std")]
+#[alloc_error_handler]
+#[no_mangle]
+pub fn oom(_: core::alloc::Layout) -> ! {
+	unsafe {
+		core::intrinsics::abort();
+	}
+}
+
+#[cfg(feature = "no_std")]
+#[no_mangle]
+pub extern fn validate_block(params: *const u8, len: usize) -> usize {
+	loop {}
+}
+