Don't include :code by default in storage proofs (#5060)

* Adds test to verify that the runtime currently is always contained in
the proof

* Start passing the runtime wasm code from the outside

* Fix compilation

* More build fixes

* Make the test work as expected now :)

* Last fixes

* Fixes benchmarks

* Review feedback

* Apply suggestions from code review

Co-Authored-By: Sergei Pepyakin <sergei@parity.io>

* Review feedback

* Fix compilation

Co-authored-by: Sergei Pepyakin <s.pepyakin@gmail.com>

substrate/Cargo.lock

@@ -1478,6 +1478,7 @@ dependencies = [
  "sc-executor",
  "sc-service",
  "sp-runtime",
+ "sp-state-machine",
  "structopt",
 ]
 
@@ -5652,6 +5653,8 @@ dependencies = [
  "sp-core",
  "sp-runtime",
  "sp-state-machine",
+ "sp-trie",
+ "substrate-test-runtime-client",
 ]
 
 [[package]]
@@ -6955,6 +6958,7 @@ dependencies = [
  "sp-api",
  "sp-blockchain",
  "sp-consensus",
+ "sp-core",
  "sp-runtime",
  "sp-state-machine",
  "sp-version",

substrate/bin/node/executor/benches/bench.rs

@@ -25,8 +25,8 @@ use node_runtime::constants::currency::*;
 use node_testing::keyring::*;
 use sp_core::{Blake2Hasher, NativeOrEncoded, NeverNativeValue};
 use sp_core::storage::well_known_keys;
-use sp_core::traits::CodeExecutor;
+use sp_core::traits::{CodeExecutor, RuntimeCode};
-use	frame_support::Hashable;
+use frame_support::Hashable;
 use sp_state_machine::TestExternalities as CoreTestExternalities;
 use sc_executor::{NativeExecutor, RuntimeInfo, WasmExecutionMethod, Externalities};
 
@@ -89,9 +89,12 @@ fn construct_block<E: Externalities>(
 		digest: Default::default(),
 	};
 
+	let runtime_code = RuntimeCode::from_externalities(ext).expect("`ext` provides `:code`");
+
 	// execute the block to get the real header.
 	executor.call::<_, NeverNativeValue, fn() -> _>(
 		ext,
+		&runtime_code,
 		"Core_initialize_block",
 		&header.encode(),
 		true,
@@ -101,6 +104,7 @@ fn construct_block<E: Externalities>(
 	for i in extrinsics.iter() {
 		executor.call::<_, NeverNativeValue, fn() -> _>(
 			ext,
+			&runtime_code,
 			"BlockBuilder_apply_extrinsic",
 			&i.encode(),
 			true,
@@ -110,6 +114,7 @@ fn construct_block<E: Externalities>(
 
 	let header = match executor.call::<_, NeverNativeValue, fn() -> _>(
 		ext,
+		&runtime_code,
 		"BlockBuilder_finalize_block",
 		&[0u8;0],
 		true,
@@ -165,7 +170,9 @@ fn bench_execute_block(c: &mut Criterion) {
 			// Get the runtime version to initialize the runtimes cache.
 			{
 				let mut test_ext = new_test_ext(&genesis_config);
-				executor.runtime_version(&mut test_ext.ext());
+				let runtime_code = RuntimeCode::from_externalities(&test_ext.ext())
+					.expect("`test_ext` provides `:code`");
+				executor.runtime_version(&mut test_ext.ext(), &runtime_code).unwrap();
 			}
 
 			let blocks = test_blocks(&genesis_config, &executor);
@@ -173,9 +180,12 @@ fn bench_execute_block(c: &mut Criterion) {
 			b.iter_batched_ref(
 				|| new_test_ext(&genesis_config),
 				|test_ext| {
+					let runtime_code = RuntimeCode::from_externalities(&test_ext.ext())
+						.expect("`test_ext` provides `:code`");
 					for block in blocks.iter() {
 						executor.call::<_, NeverNativeValue, fn() -> _>(
 							&mut test_ext.ext(),
+							&runtime_code,
 							"Core_execute_block",
 							&block.0,
 							use_native,

substrate/bin/node/executor/tests/common.rs

@@ -18,8 +18,7 @@ use codec::{Encode, Decode};
 use frame_support::Hashable;
 use sp_state_machine::TestExternalities as CoreTestExternalities;
 use sp_core::{
-	Blake2Hasher, NeverNativeValue, NativeOrEncoded,
+	Blake2Hasher, NeverNativeValue, NativeOrEncoded, traits::{CodeExecutor, RuntimeCode},
-	traits::CodeExecutor,
 };
 use sp_runtime::{ApplyExtrinsicResult, traits::Header as HeaderT};
 use sc_executor::{NativeExecutor, WasmExecutionMethod};
@@ -74,8 +73,11 @@ pub fn executor_call<
 	native_call: Option<NC>,
 ) -> (Result<NativeOrEncoded<R>>, bool) {
 	let mut t = t.ext();
+	let runtime_code = RuntimeCode::from_externalities(&t)
+		.expect("Code should be part of the externalities");
 	executor().call::<_, R, NC>(
 		&mut t,
+		&runtime_code,
 		method,
 		data,
 		use_native,

substrate/client/basic-authorship/src/basic_authorship.rs

@@ -231,7 +231,8 @@ impl<A, B, Block, C> ProposerInner<B, Block, C, A>
 					debug!("[{:?}] Pushed to the block.", pending_tx_hash);
 				}
 				Err(sp_blockchain::Error::ApplyExtrinsicFailed(sp_blockchain::ApplyExtrinsicFailed::Validity(e)))
-						if e.exhausted_resources() => {
+					if e.exhausted_resources() =>
+				{
 					if is_first {
 						debug!("[{:?}] Invalid transaction: FullBlock on empty block", pending_tx_hash);
 						unqueue_invalid.push(pending_tx_hash);

substrate/client/block-builder/Cargo.toml

@@ -19,3 +19,7 @@ sp-core = { version = "2.0.0-alpha.2", path = "../../primitives/core" }
 sp-block-builder = { version = "2.0.0-alpha.2", path = "../../primitives/block-builder" }
 sc-client-api = { version = "2.0.0-alpha.2", path = "../api" }
 codec = { package = "parity-scale-codec", version = "1.2.0", features = ["derive"] }
+
+[dev-dependencies]
+substrate-test-runtime-client = { path = "../../test-utils/runtime/client" }
+sp-trie = { version = "2.0.0-alpha.2", path = "../../primitives/trie" }

substrate/client/block-builder/src/lib.rs

@@ -152,12 +152,20 @@ where
 
 	/// Push onto the block's list of extrinsics.
 	///
-	/// This will treat incoming extrinsic `xt` as trusted and skip signature check (for signed transactions).
+	/// This will treat incoming extrinsic `xt` as trusted and skip signature check
-	pub fn push_trusted(&mut self, xt: <Block as BlockT>::Extrinsic) -> Result<(), ApiErrorFor<A, Block>> {
+	/// (for signed transactions).
+	pub fn push_trusted(
+		&mut self,
+		xt: <Block as BlockT>::Extrinsic,
+	) -> Result<(), ApiErrorFor<A, Block>> {
 		self.push_internal(xt, true)
 	}
 
-	fn push_internal(&mut self, xt: <Block as BlockT>::Extrinsic, skip_signature: bool) -> Result<(), ApiErrorFor<A, Block>> {
+	fn push_internal(
+		&mut self,
+		xt: <Block as BlockT>::Extrinsic,
+		skip_signature: bool,
+	) -> Result<(), ApiErrorFor<A, Block>> {
 		let block_id = &self.block_id;
 		let extrinsics = &mut self.extrinsics;
 
@@ -175,7 +183,7 @@ where
 					ExecutionContext::BlockConstruction,
 					xt.clone(),
 				)?
-			} else  {
+			} else {
 				api.apply_extrinsic_with_context(
 					block_id,
 					ExecutionContext::BlockConstruction,
@@ -241,3 +249,41 @@ where
 		})
 	}
 }
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use sp_blockchain::HeaderBackend;
+	use sp_core::Blake2Hasher;
+	use sp_state_machine::Backend;
+	use substrate_test_runtime_client::{DefaultTestClientBuilderExt, TestClientBuilderExt};
+
+	#[test]
+	fn block_building_storage_proof_does_not_include_runtime_by_default() {
+		let builder = substrate_test_runtime_client::TestClientBuilder::new();
+		let backend = builder.backend();
+		let client = builder.build();
+
+		let block = BlockBuilder::new(
+			&client,
+			client.info().best_hash,
+			client.info().best_number,
+			RecordProof::Yes,
+			Default::default(),
+			&*backend,
+		).unwrap().build().unwrap();
+
+		let proof = block.proof.expect("Proof is build on request");
+
+		let backend = sp_state_machine::create_proof_check_backend::<Blake2Hasher>(
+			block.storage_changes.transaction_storage_root,
+			proof,
+		).unwrap();
+
+		assert!(
+			backend.storage(&sp_core::storage::well_known_keys::CODE)
+				.unwrap_err()
+				.contains("Database missing expected key"),
+		);
+	}
+}

substrate/client/executor/src/lib.rs

@@ -110,8 +110,12 @@ pub trait RuntimeInfo {
 	/// Native runtime information.
 	fn native_version(&self) -> &NativeVersion;
 
-	/// Extract RuntimeVersion of given :code block
+	/// Extract [`RuntimeVersion`](sp_version::RuntimeVersion) of the given `runtime_code`.
-	fn runtime_version<E: Externalities> (&self, ext: &mut E) -> error::Result<RuntimeVersion>;
+	fn runtime_version<E: Externalities>(
+		&self,
+		ext: &mut E,
+		runtime_code: &sp_core::traits::RuntimeCode,
+	) -> error::Result<RuntimeVersion>;
 }
 
 #[cfg(test)]

substrate/client/executor/src/native_executor.rs

@@ -20,7 +20,7 @@ use crate::{
 };
 use sp_version::{NativeVersion, RuntimeVersion};
 use codec::{Decode, Encode};
-use sp_core::{NativeOrEncoded, traits::{CodeExecutor, Externalities}};
+use sp_core::{NativeOrEncoded, traits::{CodeExecutor, Externalities, RuntimeCode}};
 use log::trace;
 use std::{result, cell::RefCell, panic::{UnwindSafe, AssertUnwindSafe}, sync::Arc};
 use sp_wasm_interface::{HostFunctions, Function};
@@ -130,6 +130,7 @@ impl<D: NativeExecutionDispatch> NativeExecutor<D> {
 	fn with_runtime<E, R>(
 		&self,
 		ext: &mut E,
+		runtime_code: &RuntimeCode,
 		f: impl for<'a> FnOnce(
 			AssertUnwindSafe<&'a mut (dyn WasmRuntime + 'static)>,
 			&'a RuntimeVersion,
@@ -138,8 +139,9 @@ impl<D: NativeExecutionDispatch> NativeExecutor<D> {
 	) -> Result<R> where E: Externalities {
 		RUNTIMES_CACHE.with(|cache| {
 			let mut cache = cache.borrow_mut();
-			let (runtime, version, code_hash) = cache.fetch_runtime(
+			let (runtime, version) = cache.fetch_runtime(
 				ext,
+				runtime_code,
 				self.fallback_method,
 				self.default_heap_pages,
 				&*self.host_functions,
@@ -151,7 +153,7 @@ impl<D: NativeExecutionDispatch> NativeExecutor<D> {
 			match f(runtime, version, ext) {
 				Ok(res) => res,
 				Err(e) => {
-					cache.invalidate_runtime(self.fallback_method, code_hash);
+					cache.invalidate_runtime(self.fallback_method, runtime_code.hash.clone());
 					Err(e)
 				}
 			}
@@ -179,8 +181,9 @@ impl<D: NativeExecutionDispatch> RuntimeInfo for NativeExecutor<D> {
 	fn runtime_version<E: Externalities>(
 		&self,
 		ext: &mut E,
+		runtime_code: &RuntimeCode,
 	) -> Result<RuntimeVersion> {
-		self.with_runtime(ext, |_runtime, version, _ext| Ok(Ok(version.clone())))
+		self.with_runtime(ext, runtime_code, |_runtime, version, _ext| Ok(Ok(version.clone())))
 	}
 }
 
@@ -195,13 +198,14 @@ impl<D: NativeExecutionDispatch + 'static> CodeExecutor for NativeExecutor<D> {
 	>(
 		&self,
 		ext: &mut E,
+		runtime_code: &RuntimeCode,
 		method: &str,
 		data: &[u8],
 		use_native: bool,
 		native_call: Option<NC>,
-	) -> (Result<NativeOrEncoded<R>>, bool){
+	) -> (Result<NativeOrEncoded<R>>, bool) {
 		let mut used_native = false;
-		let result = self.with_runtime(ext, |mut runtime, onchain_version, mut ext| {
+		let result = self.with_runtime(ext, runtime_code, |mut runtime, onchain_version, mut ext| {
 			match (
 				use_native,
 				onchain_version.can_call_with(&self.native_version.runtime_version),

substrate/client/executor/src/wasm_runtime.rs

@@ -22,7 +22,7 @@
 use crate::error::{Error, WasmError};
 use log::{trace, warn};
 use codec::Decode;
-use sp_core::{storage::well_known_keys, traits::Externalities};
+use sp_core::traits::{Externalities, RuntimeCode};
 use sp_version::RuntimeVersion;
 use std::{collections::hash_map::{Entry, HashMap}, panic::AssertUnwindSafe};
 use sc_executor_common::wasm_runtime::WasmRuntime;
@@ -86,8 +86,9 @@ impl RuntimesCache {
 	///
 	/// # Parameters
 	///
-	/// `ext` - Externalities to use for the runtime. This is used for setting
+	/// `ext` - Externalities to use for the getting the runtime's version call.
-	/// up an initial runtime instance.
+	///
+	/// `runtime_code` - The runtime wasm code used setup the runtime.
 	///
 	/// `default_heap_pages` - Number of 64KB pages to allocate for Wasm execution.
 	///
@@ -95,8 +96,8 @@ impl RuntimesCache {
 	///
 	/// # Return value
 	///
-	/// If no error occurred a tuple `(&mut WasmRuntime, H256)` is
+	/// If no error occurred a tuple `(&mut WasmRuntime, RuntimeVerion)` is
-	/// returned. `H256` is the hash of the runtime code.
+	/// returned.
 	///
 	/// In case of failure one of two errors can be returned:
 	///
@@ -107,20 +108,14 @@ impl RuntimesCache {
 	pub fn fetch_runtime<E: Externalities>(
 		&mut self,
 		ext: &mut E,
+		runtime_code: &RuntimeCode,
 		wasm_method: WasmExecutionMethod,
 		default_heap_pages: u64,
 		host_functions: &[&'static dyn Function],
-	) -> Result<(&mut (dyn WasmRuntime + 'static), &RuntimeVersion, Vec<u8>), Error> {
+	) -> Result<(&mut (dyn WasmRuntime + 'static), &RuntimeVersion), Error> {
-		let code_hash = ext
+		let heap_pages = runtime_code.heap_pages.unwrap_or(default_heap_pages);
-			.original_storage_hash(well_known_keys::CODE)
-			.ok_or(Error::InvalidCode("`CODE` not found in storage.".into()))?;
 
-		let heap_pages = ext
+		let result = match self.instances.entry((wasm_method, runtime_code.hash.clone())) {
-			.storage(well_known_keys::HEAP_PAGES)
-			.and_then(|pages| u64::decode(&mut &pages[..]).ok())
-			.unwrap_or(default_heap_pages);
-
-		let result = match self.instances.entry((wasm_method, code_hash.clone())) {
 			Entry::Occupied(o) => {
 				let result = o.into_mut();
 				if let Ok(ref mut cached_runtime) = result {
@@ -142,6 +137,7 @@ impl RuntimesCache {
 						*result = create_versioned_wasm_runtime(
 							ext,
 							wasm_method,
+							runtime_code,
 							heap_pages,
 							host_functions.into(),
 						);
@@ -157,6 +153,7 @@ impl RuntimesCache {
 				let result = create_versioned_wasm_runtime(
 					ext,
 					wasm_method,
+					runtime_code,
 					heap_pages,
 					host_functions.into(),
 				);
@@ -168,7 +165,7 @@ impl RuntimesCache {
 		};
 
 		result.as_mut()
-			.map(|entry| (entry.runtime.as_mut(), &entry.version, code_hash))
+			.map(|entry| (entry.runtime.as_mut(), &entry.version))
 			.map_err(|ref e| Error::InvalidCode(format!("{:?}", e)))
 	}
 
@@ -209,13 +206,17 @@ pub fn create_wasm_runtime_with_code(
 fn create_versioned_wasm_runtime<E: Externalities>(
 	ext: &mut E,
 	wasm_method: WasmExecutionMethod,
+	runtime_code: &RuntimeCode,
 	heap_pages: u64,
 	host_functions: Vec<&'static dyn Function>,
 ) -> Result<VersionedRuntime, WasmError> {
-	let code = ext
+	let mut runtime = create_wasm_runtime_with_code(
-		.original_storage(well_known_keys::CODE)
+		wasm_method,
-		.ok_or(WasmError::CodeNotFound)?;
+		heap_pages,
-	let mut runtime = create_wasm_runtime_with_code(wasm_method, heap_pages, &code, host_functions, false)?;
+		&runtime_code.code,
+		host_functions,
+		false,
+	)?;
 
 	// Call to determine runtime version.
 	let version_result = {

substrate/client/network/src/chain.rs

@@ -62,7 +62,12 @@ pub trait Client<Block: BlockT>: Send + Sync {
 	) -> Result<StorageProof, Error>;
 
 	/// Get method execution proof.
-	fn execution_proof(&self, block: &Block::Hash, method: &str, data: &[u8]) -> Result<(Vec<u8>, StorageProof), Error>;
+	fn execution_proof(
+		&self,
+		block: &Block::Hash,
+		method: &str,
+		data: &[u8],
+	) -> Result<(Vec<u8>, StorageProof), Error>;
 
 	/// Get key changes proof.
 	fn key_changes_proof(
@@ -152,11 +157,7 @@ impl<B, E, Block, RA> Client<Block> for SubstrateClient<B, E, Block, RA> where
 		method: &str,
 		data: &[u8],
 	) -> Result<(Vec<u8>, StorageProof), Error> {
-		(self as &SubstrateClient<B, E, Block, RA>).execution_proof(
+		SubstrateClient::execution_proof(self, &BlockId::Hash(block.clone()), method, data)
-			&BlockId::Hash(block.clone()),
-			method,
-			data,
-		)
 	}
 
 	fn key_changes_proof(
@@ -168,7 +169,14 @@ impl<B, E, Block, RA> Client<Block> for SubstrateClient<B, E, Block, RA> where
 		storage_key: Option<&StorageKey>,
 		key: &StorageKey,
 	) -> Result<ChangesProof<Block::Header>, Error> {
-		(self as &SubstrateClient<B, E, Block, RA>).key_changes_proof(first, last, min, max, storage_key, key)
+		(self as &SubstrateClient<B, E, Block, RA>).key_changes_proof(
+			first,
+			last,
+			min,
+			max,
+			storage_key,
+			key,
+		)
 	}
 
 	fn is_descendent_of(&self, base: &Block::Hash, block: &Block::Hash) -> Result<bool, Error> {

substrate/client/network/src/protocol/light_client_handler.rs

@@ -254,13 +254,12 @@ where
 	B: Block,
 {
 	/// Construct a new light client handler.
-	pub fn new
+	pub fn new(
-		( cfg: Config
+		cfg: Config,
-		, chain: Arc<dyn Client<B>>
+		chain: Arc<dyn Client<B>>,
-		, checker: Arc<dyn fetcher::FetchChecker<B>>
+		checker: Arc<dyn fetcher::FetchChecker<B>>,
-		, peerset: sc_peerset::PeersetHandle
+		peerset: sc_peerset::PeersetHandle,
-		) -> Self
+	) -> Self {
-	{
 		LightClientHandler {
 			config: cfg,
 			chain,
@@ -425,7 +424,8 @@ where
 		log::trace!("remote call request from {} ({} at {:?})",
 			peer,
 			request.method,
-			request.block);
+			request.block,
+		);
 
 		let block = Decode::decode(&mut request.block.as_ref())?;
 
@@ -436,7 +436,8 @@ where
 					peer,
 					request.method,
 					request.block,
-					e);
+					e,
+				);
 				StorageProof::empty()
 			}
 		};

substrate/client/network/src/protocol/light_dispatch.rs

@@ -750,7 +750,11 @@ pub mod tests {
 			}
 		}
 
-		fn check_execution_proof(&self, _: &RemoteCallRequest<B::Header>, _: StorageProof) -> ClientResult<Vec<u8>> {
+		fn check_execution_proof(
+			&self,
+			_: &RemoteCallRequest<B::Header>,
+			_: StorageProof,
+		) -> ClientResult<Vec<u8>> {
 			match self.ok {
 				true => Ok(vec![42]),
 				false => Err(ClientError::Backend("Test error".into())),

substrate/client/src/call_executor.rs

@@ -25,7 +25,7 @@ use sp_state_machine::{
 };
 use sc_executor::{RuntimeVersion, RuntimeInfo, NativeVersion};
 use sp_externalities::Extensions;
-use sp_core::{NativeOrEncoded, NeverNativeValue, traits::CodeExecutor};
+use sp_core::{NativeOrEncoded, NeverNativeValue, traits::{CodeExecutor, RuntimeCode}};
 use sp_api::{ProofRecorder, InitializeBlock, StorageTransactionCache};
 use sc_client_api::{backend, call_executor::CallExecutor};
 
@@ -90,6 +90,7 @@ where
 			method,
 			call_data,
 			extensions.unwrap_or_default(),
+			&sp_state_machine::backend::get_runtime_code(&state)?,
 		).execute_using_consensus_failure_handler::<_, NeverNativeValue, fn() -> _>(
 			strategy.get_manager(),
 			None,
@@ -140,6 +141,8 @@ where
 
 		// make sure to destroy state before exiting this function
 		let mut state = self.backend.state_at(*at)?;
+		let runtime_code = sp_state_machine::backend::get_runtime_code(&state)?;
+
 		let result = match recorder {
 			Some(recorder) => state.as_trie_backend()
 				.ok_or_else(||
@@ -160,6 +163,7 @@ where
 						method,
 						call_data,
 						extensions.unwrap_or_default(),
+						&runtime_code,
 					)
 					// TODO: https://github.com/paritytech/substrate/issues/4455
 					// .with_storage_transaction_cache(storage_transaction_cache.as_mut().map(|c| &mut **c))
@@ -173,6 +177,7 @@ where
 				method,
 				call_data,
 				extensions.unwrap_or_default(),
+				&runtime_code,
 			)
 			.with_storage_transaction_cache(storage_transaction_cache.as_mut().map(|c| &mut **c))
 			.execute_using_consensus_failure_handler(execution_manager, native_call)
@@ -197,7 +202,8 @@ where
 			changes_trie_state,
 			None,
 		);
-		let version = self.executor.runtime_version(&mut ext);
+		let wasm_code = RuntimeCode::from_externalities(&ext).map_err(|e| e.to_string().into());
+		let version = wasm_code.and_then(|c| self.executor.runtime_version(&mut ext, &c));
 		{
 			let _lock = self.backend.get_import_lock().read();
 			self.backend.destroy_state(state)?;
@@ -218,6 +224,7 @@ where
 			&self.executor,
 			method,
 			call_data,
+			&sp_state_machine::backend::get_runtime_code(trie_state)?,
 		)
 		.map_err(Into::into)
 	}

substrate/client/src/client.rs

@@ -41,8 +41,7 @@ use sp_runtime::{
 use sp_state_machine::{
 	DBValue, Backend as StateBackend, ChangesTrieAnchorBlockId,
 	prove_read, prove_child_read, ChangesTrieRootsStorage, ChangesTrieStorage,
-	ChangesTrieConfigurationRange, key_changes, key_changes_proof, StorageProof,
+	ChangesTrieConfigurationRange, key_changes, key_changes_proof,
-	merge_storage_proofs,
 };
 use sc_executor::{RuntimeVersion, RuntimeInfo};
 use sp_consensus::{
@@ -55,6 +54,7 @@ use sp_blockchain::{self as blockchain,
 	well_known_cache_keys::Id as CacheKeyId,
 	HeaderMetadata, CachedHeaderMetadata,
 };
+use sp_trie::StorageProof;
 
 use sp_api::{
 	CallApiAt, ConstructRuntimeApi, Core as CoreApi, ApiExt, ApiRef, ProvideRuntimeApi,
@@ -482,9 +482,19 @@ impl<B, E, Block, RA> Client<B, E, Block, RA> where
 		method: &str,
 		call_data: &[u8]
 	) -> sp_blockchain::Result<(Vec<u8>, StorageProof)> {
+		// Make sure we include the `:code` and `:heap_pages` in the execution proof to be
+		// backwards compatible.
+		//
+		// TODO: Remove when solved: https://github.com/paritytech/substrate/issues/5047
+		let code_proof = self.read_proof(
+			id,
+			&[well_known_keys::CODE.to_vec(), well_known_keys::HEAP_PAGES.to_vec()],
+		)?;
+
 		let state = self.state_at(id)?;
 		let header = self.prepare_environment_block(id)?;
 		prove_execution(state, header, &self.executor, method, call_data)
+			.map(|p| (p.0, StorageProof::merge(vec![p.1, code_proof])))
 	}
 
 	/// Reads given header and generates CHT-based header proof.
@@ -769,7 +779,7 @@ impl<B, E, Block, RA> Client<B, E, Block, RA> where
 			Ok(())
 		}, ())?;
 
-		Ok(merge_storage_proofs(proofs))
+		Ok(StorageProof::merge(proofs))
 	}
 
 	/// Generates CHT-based proof for roots of changes tries at given blocks (that are part of single CHT).

substrate/client/src/genesis.rs

@@ -89,6 +89,8 @@ mod tests {
 		};
 		let hash = header.hash();
 		let mut overlay = OverlayedChanges::default();
+		let runtime_code = sp_state_machine::backend::get_runtime_code(&backend)
+			.expect("Code is part of the backend");
 
 		StateMachine::new(
 			backend,
@@ -98,6 +100,7 @@ mod tests {
 			"Core_initialize_block",
 			&header.encode(),
 			Default::default(),
+			&runtime_code,
 		).execute(
 			ExecutionStrategy::NativeElseWasm,
 		).unwrap();
@@ -111,6 +114,7 @@ mod tests {
 				"BlockBuilder_apply_extrinsic",
 				&tx.encode(),
 				Default::default(),
+				&runtime_code,
 			).execute(
 				ExecutionStrategy::NativeElseWasm,
 			).unwrap();
@@ -124,6 +128,7 @@ mod tests {
 			"BlockBuilder_finalize_block",
 			&[],
 			Default::default(),
+			&runtime_code,
 		).execute(
 			ExecutionStrategy::NativeElseWasm,
 		).unwrap();
@@ -161,6 +166,8 @@ mod tests {
 
 		let backend = InMemoryBackend::from(storage);
 		let (b1data, _b1hash) = block1(genesis_hash, &backend);
+		let runtime_code = sp_state_machine::backend::get_runtime_code(&backend)
+			.expect("Code is part of the backend");
 
 		let mut overlay = OverlayedChanges::default();
 		let _ = StateMachine::new(
@@ -171,6 +178,7 @@ mod tests {
 			"Core_execute_block",
 			&b1data,
 			Default::default(),
+			&runtime_code,
 		).execute(
 			ExecutionStrategy::NativeElseWasm,
 		).unwrap();
@@ -189,6 +197,8 @@ mod tests {
 
 		let backend = InMemoryBackend::from(storage);
 		let (b1data, _b1hash) = block1(genesis_hash, &backend);
+		let runtime_code = sp_state_machine::backend::get_runtime_code(&backend)
+			.expect("Code is part of the backend");
 
 		let mut overlay = OverlayedChanges::default();
 		let _ = StateMachine::new(
@@ -199,6 +209,7 @@ mod tests {
 			"Core_execute_block",
 			&b1data,
 			Default::default(),
+			&runtime_code,
 		).execute(
 			ExecutionStrategy::AlwaysWasm,
 		).unwrap();
@@ -217,6 +228,8 @@ mod tests {
 
 		let backend = InMemoryBackend::from(storage);
 		let (b1data, _b1hash) = block1(genesis_hash, &backend);
+		let runtime_code = sp_state_machine::backend::get_runtime_code(&backend)
+			.expect("Code is part of the backend");
 
 		let mut overlay = OverlayedChanges::default();
 		let r = StateMachine::new(
@@ -227,6 +240,7 @@ mod tests {
 			"Core_execute_block",
 			&b1data,
 			Default::default(),
+			&runtime_code,
 		).execute(
 			ExecutionStrategy::NativeElseWasm,
 		);

substrate/client/src/light/backend.rs

@@ -172,9 +172,9 @@ impl<S, Block> ClientBackend<Block> for Backend<S, HasherFor<Block>>
 				match maybe_val {
 					Some(val) => self.blockchain.storage().insert_aux(
 						&[(&key[..], &val[..])],
-						::std::iter::empty(),
+						std::iter::empty(),
 					)?,
-					None => self.blockchain.storage().insert_aux(::std::iter::empty(), &[&key[..]])?,
+					None => self.blockchain.storage().insert_aux(std::iter::empty(), &[&key[..]])?,
 				}
 			}
 		}

substrate/client/src/light/call_executor.rs

@@ -29,7 +29,6 @@ use sp_externalities::Extensions;
 use sp_state_machine::{
 	self, Backend as StateBackend, OverlayedChanges, ExecutionStrategy, create_proof_check_backend,
 	execution_proof_check_on_trie_backend, ExecutionManager, StorageProof,
-	merge_storage_proofs,
 };
 use hash_db::Hasher;
 
@@ -206,7 +205,7 @@ pub fn prove_execution<Block, S, E>(
 		method,
 		call_data,
 	)?;
-	let total_proof = merge_storage_proofs(vec![init_proof, exec_proof]);
+	let total_proof = StorageProof::merge(vec![init_proof, exec_proof]);
 
 	Ok((result, total_proof))
 }
@@ -259,12 +258,17 @@ fn check_execution_proof_with_make_header<Header, E, H, MakeNextHeader: Fn(&Head
 	let mut changes = OverlayedChanges::default();
 	let trie_backend = create_proof_check_backend(root, remote_proof)?;
 	let next_header = make_next_header(&request.header);
+
+	// TODO: Remove when solved: https://github.com/paritytech/substrate/issues/5047
+	let runtime_code = sp_state_machine::backend::get_runtime_code(&trie_backend)?;
+
 	execution_proof_check_on_trie_backend::<H, Header::Number, _>(
 		&trie_backend,
 		&mut changes,
 		executor,
 		"Core_initialize_block",
 		&next_header.encode(),
+		&runtime_code,
 	)?;
 
 	// execute method
@@ -274,7 +278,9 @@ fn check_execution_proof_with_make_header<Header, E, H, MakeNextHeader: Fn(&Head
 		executor,
 		&request.method,
 		&request.call_data,
-	).map_err(Into::into)
+		&runtime_code,
+	)
+	.map_err(Into::into)
 }
 
 #[cfg(test)]

substrate/client/src/light/fetcher.rs

@@ -30,7 +30,7 @@ use sp_runtime::traits::{
 use sp_state_machine::{
 	ChangesTrieRootsStorage, ChangesTrieAnchorBlockId, ChangesTrieConfigurationRange,
 	InMemoryChangesTrieStorage, TrieBackend, read_proof_check, key_changes_proof_check_with_db,
-	create_proof_check_backend_storage, read_child_proof_check,
+	read_child_proof_check,
 };
 pub use sp_state_machine::StorageProof;
 use sp_blockchain::{Error as ClientError, Result as ClientResult};
@@ -155,7 +155,7 @@ impl<E, H, B: BlockT, S: BlockchainStorage<B>> LightDataChecker<E, H, B, S> {
 			H::Out: Ord + codec::Codec,
 	{
 		// all the checks are sharing the same storage
-		let storage = create_proof_check_backend_storage(remote_roots_proof);
+		let storage = remote_roots_proof.into_memory_db();
 
 		// remote_roots.keys() are sorted => we can use this to group changes tries roots
 		// that are belongs to the same CHT
@@ -187,7 +187,8 @@ impl<E, H, B: BlockT, S: BlockchainStorage<B>> LightDataChecker<E, H, B, S> {
 					local_cht_root,
 					block,
 					remote_changes_trie_root,
-					&proving_backend)?;
+					&proving_backend,
+				)?;
 
 				// and return the storage to use in following checks
 				storage = proving_backend.into_storage();
@@ -270,7 +271,7 @@ impl<E, Block, H, S> FetchChecker<Block> for LightDataChecker<E, H, Block, S>
 		body: Vec<Block::Extrinsic>
 	) -> ClientResult<Vec<Block::Extrinsic>> {
 		// TODO: #2621
-		let	extrinsics_root = HashFor::<Block>::ordered_trie_root(
+		let extrinsics_root = HashFor::<Block>::ordered_trie_root(
 			body.iter().map(Encode::encode).collect(),
 		);
 		if *request.header.extrinsics_root() == extrinsics_root {
@@ -294,7 +295,7 @@ struct RootsStorage<'a, Number: AtLeast32Bit, Hash: 'a> {
 impl<'a, H, Number, Hash> ChangesTrieRootsStorage<H, Number> for RootsStorage<'a, Number, Hash>
 	where
 		H: Hasher,
-		Number: ::std::fmt::Display + ::std::hash::Hash + Clone + AtLeast32Bit + Encode + Decode + Send + Sync + 'static,
+		Number: std::fmt::Display + std::hash::Hash + Clone + AtLeast32Bit + Encode + Decode + Send + Sync + 'static,
 		Hash: 'a + Send + Sync + Clone + AsRef<[u8]>,
 {
 	fn build_anchor(

substrate/frame/system/benches/bench.rs

@@ -18,7 +18,7 @@ use criterion::{Criterion, criterion_group, criterion_main, black_box};
 use frame_system as system;
 use frame_support::{decl_module, decl_event, impl_outer_origin, impl_outer_event, weights::Weight};
 use sp_core::H256;
-use sp_runtime::{Perbill, PerThing, traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+use sp_runtime::{Perbill, traits::{BlakeTwo256, IdentityLookup}, testing::Header};
 
 mod module {
 	use super::*;

substrate/primitives/api/test/Cargo.toml

@@ -24,6 +24,7 @@ rustversion = "1.0.0"
 [dev-dependencies]
 criterion = "0.3.0"
 substrate-test-runtime-client = { version = "2.0.0-dev", path = "../../../test-utils/runtime/client" }
+sp-core = { version = "2.0.0-alpha.1", path = "../../core" }
 
 [[bench]]
 name = "bench"

substrate/primitives/api/test/tests/runtime_calls.rs

@@ -164,6 +164,12 @@ fn record_proof_works() {
 	let block_id = BlockId::Number(client.chain_info().best_number);
 	let storage_root = longest_chain.best_chain().unwrap().state_root().clone();
 
+	let runtime_code = sp_core::traits::RuntimeCode {
+		code: client.code_at(&block_id).unwrap(),
+		hash: vec![1],
+		heap_pages: None,
+	};
+
 	let transaction = Transfer {
 		amount: 1000,
 		nonce: 0,
@@ -192,5 +198,6 @@ fn record_proof_works() {
 		&executor,
 		"Core_execute_block",
 		&block.encode(),
+		&runtime_code,
 	).expect("Executes block while using the proof backend");
 }

substrate/primitives/core/src/traits.rs

@@ -98,6 +98,7 @@ pub trait CodeExecutor: Sized + Send + Sync + CallInWasm + Clone + 'static {
 	>(
 		&self,
 		ext: &mut E,
+		runtime_code: &RuntimeCode,
 		method: &str,
 		data: &[u8],
 		use_native: bool,
@@ -105,6 +106,70 @@ pub trait CodeExecutor: Sized + Send + Sync + CallInWasm + Clone + 'static {
 	) -> (Result<crate::NativeOrEncoded<R>, Self::Error>, bool);
 }
 
+
+/// The Wasm code of a Substrate runtime.
+#[derive(Debug, Clone, codec::Encode, codec::Decode)]
+pub struct RuntimeCode {
+	/// The actual Wasm code as binary blob.
+	pub code: Vec<u8>,
+	/// The optional heap pages this `code` should be executed with.
+	///
+	/// If `None` are given, the default value of the executor will be used.
+	pub heap_pages: Option<u64>,
+	/// The SCALE encoded hash of `code`.
+	///
+	/// The hashing algorithm isn't that important, as long as all runtime
+	/// code instances use the same.
+	pub hash: Vec<u8>,
+}
+
+impl PartialEq for RuntimeCode {
+	fn eq(&self, other: &Self) -> bool {
+		self.hash == other.hash
+	}
+}
+
+impl RuntimeCode {
+	/// Create an `RuntimeCode` instance from the given `Externalities`.
+	///
+	/// Extracts the code and the heap pages using the well known keys.
+	///
+	/// Returns an error if the code could not be found.
+	pub fn from_externalities(ext: &dyn Externalities) -> Result<Self, CodeNotFound> {
+		let code = ext.storage(sp_storage::well_known_keys::CODE).ok_or(CodeNotFound)?;
+		let hash = ext.storage_hash(sp_storage::well_known_keys::CODE).ok_or(CodeNotFound)?;
+		let heap_pages = ext.storage(sp_storage::well_known_keys::HEAP_PAGES)
+			.and_then(|hp| codec::Decode::decode(&mut &hp[..]).ok());
+
+		Ok(Self {
+			code,
+			hash,
+			heap_pages,
+		})
+	}
+
+	/// Create an empty instance.
+	///
+	/// This is only useful for tests that don't want to execute any code.
+	pub fn empty() -> Self {
+		Self {
+			code: Vec::new(),
+			hash: Vec::new(),
+			heap_pages: None,
+		}
+	}
+}
+
+/// Could not find the `:code` in the externalities while initializing the [`RuntimeCode`].
+#[derive(Debug)]
+pub struct CodeNotFound;
+
+impl std::fmt::Display for CodeNotFound {
+	fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+		write!(f, "the storage entry `:code` doesn't have any code")
+	}
+}
+
 /// Something that can call a method in a WASM blob.
 pub trait CallInWasm: Send + Sync {
 	/// Call the given `method` in the given `wasm_blob` using `call_data` (SCALE encoded arguments)

substrate/primitives/runtime/src/generic/block.rs

@@ -25,7 +25,10 @@ use serde::{Deserialize, Serialize};
 use sp_std::prelude::*;
 use sp_core::RuntimeDebug;
 use crate::codec::{Codec, Encode, Decode};
-use crate::traits::{self, Member, Block as BlockT, Header as HeaderT, MaybeSerialize, MaybeMallocSizeOf};
+use crate::traits::{
+	self, Member, Block as BlockT, Header as HeaderT, MaybeSerialize, MaybeMallocSizeOf,
+	NumberFor,
+};
 use crate::Justification;
 
 /// Something to identify a block.
@@ -35,9 +38,9 @@ use crate::Justification;
 #[cfg_attr(feature = "std", serde(deny_unknown_fields))]
 pub enum BlockId<Block: BlockT> {
 	/// Identify by block header hash.
-	Hash(<<Block as BlockT>::Header as HeaderT>::Hash),
+	Hash(Block::Hash),
 	/// Identify by block number.
-	Number(<<Block as BlockT>::Header as HeaderT>::Number),
+	Number(NumberFor<Block>),
 }
 
 impl<Block: BlockT> BlockId<Block> {
@@ -47,7 +50,7 @@ impl<Block: BlockT> BlockId<Block> {
 	}
 
 	/// Create a block ID from a number.
-	pub fn number(number: <Block::Header as HeaderT>::Number) -> Self {
+	pub fn number(number: NumberFor<Block>) -> Self {
 		BlockId::Number(number)
 	}
 }

substrate/primitives/state-machine/src/backend.rs

@@ -18,9 +18,9 @@
 
 use log::warn;
 use hash_db::Hasher;
-use codec::Encode;
+use codec::{Decode, Encode};
 
-use sp_core::storage::{ChildInfo, OwnedChildInfo};
+use sp_core::{traits::RuntimeCode, storage::{ChildInfo, OwnedChildInfo, well_known_keys}};
 use sp_trie::{TrieMut, MemoryDB, trie_types::TrieDBMut};
 
 use crate::{
@@ -359,3 +359,22 @@ pub(crate) fn insert_into_memory_db<H, I>(mdb: &mut MemoryDB<H>, input: I) -> Op
 
 	Some(root)
 }
+
+/// Get the runtime code from the given `backend`.
+///
+/// Returns an error if the `:code` could not be found.
+pub fn get_runtime_code<H: Hasher, B: Backend<H>>(backend: &B) -> Result<RuntimeCode, &'static str>
+	where H::Out: Encode,
+{
+	let code = backend.storage(well_known_keys::CODE)
+		.ok()
+		.flatten()
+		.ok_or("`:code` not found")?;
+	let hash = H::hash(&code).encode();
+	let heap_pages = backend.storage(well_known_keys::HEAP_PAGES)
+		.ok()
+		.flatten()
+		.and_then(|d| Decode::decode(&mut &d[..]).ok());
+
+	Ok(RuntimeCode { code, hash, heap_pages })
+}

substrate/primitives/state-machine/src/lib.rs

@@ -23,8 +23,8 @@ use log::{warn, trace};
 use hash_db::Hasher;
 use codec::{Decode, Encode, Codec};
 use sp_core::{
-	storage::ChildInfo, NativeOrEncoded, NeverNativeValue,
+	storage::ChildInfo, NativeOrEncoded, NeverNativeValue, hexdisplay::HexDisplay,
-	traits::{CodeExecutor, CallInWasmExt}, hexdisplay::HexDisplay,
+	traits::{CodeExecutor, CallInWasmExt, RuntimeCode},
 };
 use overlayed_changes::OverlayedChangeSet;
 use sp_externalities::Extensions;
@@ -42,7 +42,7 @@ mod trie_backend;
 mod trie_backend_essence;
 mod stats;
 
-pub use sp_trie::{trie_types::{Layout, TrieDBMut}, TrieMut, DBValue, MemoryDB};
+pub use sp_trie::{trie_types::{Layout, TrieDBMut}, StorageProof, TrieMut, DBValue, MemoryDB};
 pub use testing::TestExternalities;
 pub use basic::BasicExternalities;
 pub use ext::Ext;
@@ -67,8 +67,7 @@ pub use overlayed_changes::{
 	StorageCollection, ChildStorageCollection,
 };
 pub use proving_backend::{
-	create_proof_check_backend, create_proof_check_backend_storage, merge_storage_proofs,
+	create_proof_check_backend, ProofRecorder, ProvingBackend, ProvingBackendRecorder,
-	ProofRecorder, ProvingBackend, ProvingBackendRecorder, StorageProof,
 };
 pub use trie_backend_essence::{TrieBackendStorage, Storage};
 pub use trie_backend::TrieBackend;
@@ -191,6 +190,7 @@ pub struct StateMachine<'a, B, H, N, Exec>
 	changes_trie_state: Option<ChangesTrieState<'a, H, N>>,
 	_marker: PhantomData<(H, N)>,
 	storage_transaction_cache: Option<&'a mut StorageTransactionCache<B::Transaction, H, N>>,
+	runtime_code: &'a RuntimeCode,
 }
 
 impl<'a, B, H, N, Exec> StateMachine<'a, B, H, N, Exec> where
@@ -209,6 +209,7 @@ impl<'a, B, H, N, Exec> StateMachine<'a, B, H, N, Exec> where
 		method: &'a str,
 		call_data: &'a [u8],
 		mut extensions: Extensions,
+		runtime_code: &'a RuntimeCode,
 	) -> Self {
 		extensions.register(CallInWasmExt::new(exec.clone()));
 
@@ -222,6 +223,7 @@ impl<'a, B, H, N, Exec> StateMachine<'a, B, H, N, Exec> where
 			changes_trie_state,
 			_marker: PhantomData,
 			storage_transaction_cache: None,
+			runtime_code,
 		}
 	}
 
@@ -292,6 +294,7 @@ impl<'a, B, H, N, Exec> StateMachine<'a, B, H, N, Exec> where
 
 		let (result, was_native) = self.exec.call(
 			&mut ext,
+			self.runtime_code,
 			self.method,
 			self.call_data,
 			use_native,
@@ -436,6 +439,7 @@ pub fn prove_execution<B, H, N, Exec>(
 	exec: &Exec,
 	method: &str,
 	call_data: &[u8],
+	runtime_code: &RuntimeCode,
 ) -> Result<(Vec<u8>, StorageProof), Box<dyn Error>>
 where
 	B: Backend<H>,
@@ -446,7 +450,14 @@ where
 {
 	let trie_backend = backend.as_trie_backend()
 		.ok_or_else(|| Box::new(ExecutionError::UnableToGenerateProof) as Box<dyn Error>)?;
-	prove_execution_on_trie_backend::<_, _, N, _>(trie_backend, overlay, exec, method, call_data)
+	prove_execution_on_trie_backend::<_, _, N, _>(
+		trie_backend,
+		overlay,
+		exec,
+		method,
+		call_data,
+		runtime_code,
+	)
 }
 
 /// Prove execution using the given trie backend, overlayed changes, and call executor.
@@ -464,6 +475,7 @@ pub fn prove_execution_on_trie_backend<S, H, N, Exec>(
 	exec: &Exec,
 	method: &str,
 	call_data: &[u8],
+	runtime_code: &RuntimeCode,
 ) -> Result<(Vec<u8>, StorageProof), Box<dyn Error>>
 where
 	S: trie_backend_essence::TrieBackendStorage<H>,
@@ -474,7 +486,14 @@ where
 {
 	let proving_backend = proving_backend::ProvingBackend::new(trie_backend);
 	let mut sm = StateMachine::<_, H, N, Exec>::new(
-		&proving_backend, None, overlay, exec, method, call_data, Extensions::default(),
+		&proving_backend,
+		None,
+		overlay,
+		exec,
+		method,
+		call_data,
+		Extensions::default(),
+		runtime_code,
 	);
 
 	let result = sm.execute_using_consensus_failure_handler::<_, NeverNativeValue, fn() -> _>(
@@ -493,6 +512,7 @@ pub fn execution_proof_check<H, N, Exec>(
 	exec: &Exec,
 	method: &str,
 	call_data: &[u8],
+	runtime_code: &RuntimeCode,
 ) -> Result<Vec<u8>, Box<dyn Error>>
 where
 	H: Hasher,
@@ -501,7 +521,14 @@ where
 	N: crate::changes_trie::BlockNumber,
 {
 	let trie_backend = create_proof_check_backend::<H>(root.into(), proof)?;
-	execution_proof_check_on_trie_backend::<_, N, _>(&trie_backend, overlay, exec, method, call_data)
+	execution_proof_check_on_trie_backend::<_, N, _>(
+		&trie_backend,
+		overlay,
+		exec,
+		method,
+		call_data,
+		runtime_code,
+	)
 }
 
 /// Check execution proof on proving backend, generated by `prove_execution` call.
@@ -511,6 +538,7 @@ pub fn execution_proof_check_on_trie_backend<H, N, Exec>(
 	exec: &Exec,
 	method: &str,
 	call_data: &[u8],
+	runtime_code: &RuntimeCode,
 ) -> Result<Vec<u8>, Box<dyn Error>>
 where
 	H: Hasher,
@@ -519,7 +547,14 @@ where
 	N: crate::changes_trie::BlockNumber,
 {
 	let mut sm = StateMachine::<_, H, N, Exec>::new(
-		trie_backend, None, overlay, exec, method, call_data, Extensions::default(),
+		trie_backend,
+		None,
+		overlay,
+		exec,
+		method,
+		call_data,
+		Extensions::default(),
+		runtime_code,
 	);
 
 	sm.execute_using_consensus_failure_handler::<_, NeverNativeValue, fn() -> _>(
@@ -692,7 +727,9 @@ mod tests {
 	use super::*;
 	use super::ext::Ext;
 	use super::changes_trie::Configuration as ChangesTrieConfig;
-	use sp_core::{Blake2Hasher, map, traits::Externalities, storage::ChildStorageKey};
+	use sp_core::{
+		Blake2Hasher, map, traits::{Externalities, RuntimeCode}, storage::ChildStorageKey,
+	};
 
 	#[derive(Clone)]
 	struct DummyCodeExecutor {
@@ -714,6 +751,7 @@ mod tests {
 		>(
 			&self,
 			ext: &mut E,
+			_: &RuntimeCode,
 			_method: &str,
 			_data: &[u8],
 			use_native: bool,
@@ -767,6 +805,7 @@ mod tests {
 	fn execute_works() {
 		let backend = trie_backend::tests::test_trie();
 		let mut overlayed_changes = Default::default();
+		let wasm_code = RuntimeCode::empty();
 
 		let mut state_machine = StateMachine::new(
 			&backend,
@@ -781,6 +820,7 @@ mod tests {
 			"test",
 			&[],
 			Default::default(),
+			&wasm_code,
 		);
 
 		assert_eq!(
@@ -794,6 +834,7 @@ mod tests {
 	fn execute_works_with_native_else_wasm() {
 		let backend = trie_backend::tests::test_trie();
 		let mut overlayed_changes = Default::default();
+		let wasm_code = RuntimeCode::empty();
 
 		let mut state_machine = StateMachine::new(
 			&backend,
@@ -808,6 +849,7 @@ mod tests {
 			"test",
 			&[],
 			Default::default(),
+			&wasm_code,
 		);
 
 		assert_eq!(state_machine.execute(ExecutionStrategy::NativeElseWasm).unwrap(), vec![66]);
@@ -818,6 +860,7 @@ mod tests {
 		let mut consensus_failed = false;
 		let backend = trie_backend::tests::test_trie();
 		let mut overlayed_changes = Default::default();
+		let wasm_code = RuntimeCode::empty();
 
 		let mut state_machine = StateMachine::new(
 			&backend,
@@ -832,6 +875,7 @@ mod tests {
 			"test",
 			&[],
 			Default::default(),
+			&wasm_code,
 		);
 
 		assert!(
@@ -864,6 +908,7 @@ mod tests {
 			&executor,
 			"test",
 			&[],
+			&RuntimeCode::empty(),
 		).unwrap();
 
 		// check proof locally
@@ -874,6 +919,7 @@ mod tests {
 			&executor,
 			"test",
 			&[],
+			&RuntimeCode::empty(),
 		).unwrap();
 
 		// check that both results are correct

substrate/primitives/state-machine/src/proving_backend.rs

@@ -18,19 +18,19 @@
 
 use std::sync::Arc;
 use parking_lot::RwLock;
-use codec::{Decode, Encode, Codec};
+use codec::{Decode, Codec};
 use log::debug;
 use hash_db::{Hasher, HashDB, EMPTY_PREFIX, Prefix};
 use sp_trie::{
 	MemoryDB, default_child_trie_root, read_trie_value_with, read_child_trie_value_with,
-	record_all_keys
+	record_all_keys, StorageProof,
 };
 pub use sp_trie::Recorder;
 pub use sp_trie::trie_types::{Layout, TrieError};
 use crate::trie_backend::TrieBackend;
 use crate::trie_backend_essence::{Ephemeral, TrieBackendEssence, TrieBackendStorage};
 use crate::{Error, ExecutionError, Backend};
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
 use crate::DBValue;
 use sp_core::storage::ChildInfo;
 
@@ -40,82 +40,6 @@ pub struct ProvingBackendRecorder<'a, S: 'a + TrieBackendStorage<H>, H: 'a + Has
 	pub(crate) proof_recorder: &'a mut Recorder<H::Out>,
 }
 
-/// A proof that some set of key-value pairs are included in the storage trie. The proof contains
-/// the storage values so that the partial storage backend can be reconstructed by a verifier that
-/// does not already have access to the key-value pairs.
-///
-/// The proof consists of the set of serialized nodes in the storage trie accessed when looking up
-/// the keys covered by the proof. Verifying the proof requires constructing the partial trie from
-/// the serialized nodes and performing the key lookups.
-#[derive(Debug, PartialEq, Eq, Clone, Encode, Decode)]
-pub struct StorageProof {
-	trie_nodes: Vec<Vec<u8>>,
-}
-
-impl StorageProof {
-	/// Constructs a storage proof from a subset of encoded trie nodes in a storage backend.
-	pub fn new(trie_nodes: Vec<Vec<u8>>) -> Self {
-		StorageProof { trie_nodes }
-	}
-
-	/// Returns a new empty proof.
-	///
-	/// An empty proof is capable of only proving trivial statements (ie. that an empty set of
-	/// key-value pairs exist in storage).
-	pub fn empty() -> Self {
-		StorageProof {
-			trie_nodes: Vec::new(),
-		}
-	}
-
-	/// Returns whether this is an empty proof.
-	pub fn is_empty(&self) -> bool {
-		self.trie_nodes.is_empty()
-	}
-
-	/// Create an iterator over trie nodes constructed from the proof. The nodes are not guaranteed
-	/// to be traversed in any particular order.
-	pub fn iter_nodes(self) -> StorageProofNodeIterator {
-		StorageProofNodeIterator::new(self)
-	}
-}
-
-/// An iterator over trie nodes constructed from a storage proof. The nodes are not guaranteed to
-/// be traversed in any particular order.
-pub struct StorageProofNodeIterator {
-	inner: <Vec<Vec<u8>> as IntoIterator>::IntoIter,
-}
-
-impl StorageProofNodeIterator {
-	fn new(proof: StorageProof) -> Self {
-		StorageProofNodeIterator {
-			inner: proof.trie_nodes.into_iter(),
-		}
-	}
-}
-
-impl Iterator for StorageProofNodeIterator {
-	type Item = Vec<u8>;
-
-	fn next(&mut self) -> Option<Self::Item> {
-		self.inner.next()
-	}
-}
-
-/// Merges multiple storage proofs covering potentially different sets of keys into one proof
-/// covering all keys. The merged proof output may be smaller than the aggregate size of the input
-/// proofs due to deduplication of trie nodes.
-pub fn merge_storage_proofs<I>(proofs: I) -> StorageProof
-	where I: IntoIterator<Item=StorageProof>
-{
-	let trie_nodes = proofs.into_iter()
-		.flat_map(|proof| proof.iter_nodes())
-		.collect::<HashSet<_>>()
-		.into_iter()
-		.collect();
-	StorageProof { trie_nodes }
-}
-
 impl<'a, S, H> ProvingBackendRecorder<'a, S, H>
 	where
 		S: TrieBackendStorage<H>,
@@ -222,7 +146,7 @@ impl<'a, S: 'a + TrieBackendStorage<H>, H: 'a + Hasher> ProvingBackend<'a, S, H>
 		let root = essence.root().clone();
 		let recorder = ProofRecorderBackend {
 			backend: essence.backend_storage(),
-			proof_recorder: proof_recorder,
+			proof_recorder,
 		};
 		ProvingBackend(TrieBackend::new(recorder, root))
 	}
@@ -370,7 +294,7 @@ where
 	H: Hasher,
 	H::Out: Codec,
 {
-	let db = create_proof_check_backend_storage(proof);
+	let db = proof.into_memory_db();
 
 	if db.contains(&root, EMPTY_PREFIX) {
 		Ok(TrieBackend::new(db, root))
@@ -379,20 +303,6 @@ where
 	}
 }
 
-/// Create in-memory storage of proof check backend.
-pub fn create_proof_check_backend_storage<H>(
-	proof: StorageProof,
-) -> MemoryDB<H>
-where
-	H: Hasher,
-{
-	let mut db = MemoryDB::default();
-	for item in proof.iter_nodes() {
-		db.insert(EMPTY_PREFIX, &item);
-	}
-	db
-}
-
 #[cfg(test)]
 mod tests {
 	use crate::InMemoryBackend;

substrate/primitives/trie/src/lib.rs

@@ -21,6 +21,7 @@
 mod error;
 mod node_header;
 mod node_codec;
+mod storage_proof;
 mod trie_stream;
 
 use sp_std::boxed::Box;
@@ -35,6 +36,7 @@ pub use error::Error;
 pub use trie_stream::TrieStream;
 /// The Substrate format implementation of `NodeCodec`.
 pub use node_codec::NodeCodec;
+pub use storage_proof::StorageProof;
 /// Various re-exports from the `trie-db` crate.
 pub use trie_db::{
 	Trie, TrieMut, DBValue, Recorder, CError, Query, TrieLayout, TrieConfiguration, nibble_ops, TrieDBIterator,

substrate/primitives/trie/src/storage_proof.rs

@@ -0,0 +1,109 @@
+// Copyright 2020 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Parity 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.
+
+// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+use sp_std::vec::Vec;
+use codec::{Encode, Decode};
+use hash_db::{Hasher, HashDB};
+
+/// A proof that some set of key-value pairs are included in the storage trie. The proof contains
+/// the storage values so that the partial storage backend can be reconstructed by a verifier that
+/// does not already have access to the key-value pairs.
+///
+/// The proof consists of the set of serialized nodes in the storage trie accessed when looking up
+/// the keys covered by the proof. Verifying the proof requires constructing the partial trie from
+/// the serialized nodes and performing the key lookups.
+#[derive(Debug, PartialEq, Eq, Clone, Encode, Decode)]
+pub struct StorageProof {
+	trie_nodes: Vec<Vec<u8>>,
+}
+
+impl StorageProof {
+	/// Constructs a storage proof from a subset of encoded trie nodes in a storage backend.
+	pub fn new(trie_nodes: Vec<Vec<u8>>) -> Self {
+		StorageProof { trie_nodes }
+	}
+
+	/// Returns a new empty proof.
+	///
+	/// An empty proof is capable of only proving trivial statements (ie. that an empty set of
+	/// key-value pairs exist in storage).
+	pub fn empty() -> Self {
+		StorageProof {
+			trie_nodes: Vec::new(),
+		}
+	}
+
+	/// Returns whether this is an empty proof.
+	pub fn is_empty(&self) -> bool {
+		self.trie_nodes.is_empty()
+	}
+
+	/// Create an iterator over trie nodes constructed from the proof. The nodes are not guaranteed
+	/// to be traversed in any particular order.
+	pub fn iter_nodes(self) -> StorageProofNodeIterator {
+		StorageProofNodeIterator::new(self)
+	}
+
+	/// Creates a `MemoryDB` from `Self`.
+	pub fn into_memory_db<H: Hasher>(self) -> crate::MemoryDB<H> {
+		self.into()
+	}
+
+	/// Merges multiple storage proofs covering potentially different sets of keys into one proof
+	/// covering all keys. The merged proof output may be smaller than the aggregate size of the input
+	/// proofs due to deduplication of trie nodes.
+	pub fn merge<I>(proofs: I) -> Self where I: IntoIterator<Item=Self> {
+		let trie_nodes = proofs.into_iter()
+			.flat_map(|proof| proof.iter_nodes())
+			.collect::<sp_std::collections::btree_set::BTreeSet<_>>()
+			.into_iter()
+			.collect();
+
+		Self { trie_nodes }
+	}
+}
+
+/// An iterator over trie nodes constructed from a storage proof. The nodes are not guaranteed to
+/// be traversed in any particular order.
+pub struct StorageProofNodeIterator {
+	inner: <Vec<Vec<u8>> as IntoIterator>::IntoIter,
+}
+
+impl StorageProofNodeIterator {
+	fn new(proof: StorageProof) -> Self {
+		StorageProofNodeIterator {
+			inner: proof.trie_nodes.into_iter(),
+		}
+	}
+}
+
+impl Iterator for StorageProofNodeIterator {
+	type Item = Vec<u8>;
+
+	fn next(&mut self) -> Option<Self::Item> {
+		self.inner.next()
+	}
+}
+
+impl<H: Hasher> From<StorageProof> for crate::MemoryDB<H> {
+	fn from(proof: StorageProof) -> Self {
+		let mut db = crate::MemoryDB::default();
+		for item in proof.iter_nodes() {
+			db.insert(crate::EMPTY_PREFIX, &item);
+		}
+		db
+	}
+}

substrate/test-utils/runtime/src/system.rs

@@ -338,7 +338,7 @@ mod tests {
 	use sp_io::TestExternalities;
 	use substrate_test_runtime_client::{AccountKeyring, Sr25519Keyring};
 	use crate::{Header, Transfer, WASM_BINARY};
-	use sp_core::{NeverNativeValue, map, traits::CodeExecutor};
+	use sp_core::{NeverNativeValue, map, traits::{CodeExecutor, RuntimeCode}};
 	use sc_executor::{NativeExecutor, WasmExecutionMethod, native_executor_instance};
 	use sp_io::hashing::twox_128;
 
@@ -401,8 +401,11 @@ mod tests {
 	fn block_import_works_wasm() {
 		block_import_works(|b, ext| {
 			let mut ext = ext.ext();
+			let runtime_code = RuntimeCode::from_externalities(&ext)
+				.expect("Code is part of the externalities");
 			executor().call::<_, NeverNativeValue, fn() -> _>(
 				&mut ext,
+				&runtime_code,
 				"Core_execute_block",
 				&b.encode(),
 				false,
@@ -494,8 +497,11 @@ mod tests {
 	fn block_import_with_transaction_works_wasm() {
 		block_import_with_transaction_works(|b, ext| {
 			let mut ext = ext.ext();
+			let runtime_code = RuntimeCode::from_externalities(&ext)
+				.expect("Code is part of the externalities");
 			executor().call::<_, NeverNativeValue, fn() -> _>(
 				&mut ext,
+				&runtime_code,
 				"Core_execute_block",
 				&b.encode(),
 				false,

substrate/utils/frame/benchmarking-cli/Cargo.toml

@@ -16,5 +16,6 @@ sc-client = { version = "0.8.0-alpha.2", path = "../../../client" }
 sc-client-db = { version = "0.8.0-alpha.2", path = "../../../client/db" }
 sc-executor = { version = "0.8.0-alpha.2", path = "../../../client/executor" }
 sp-runtime = { version = "2.0.0-alpha.2", path = "../../../primitives/runtime" }
+sp-state-machine = { version = "0.8.0-alpha.2", path = "../../../primitives/state-machine" }
 structopt = "0.3.8"
 codec = { version = "1.2.0", package = "parity-scale-codec" }

substrate/utils/frame/benchmarking-cli/src/lib.rs

@@ -121,6 +121,7 @@ impl BenchmarkCmd {
 				self.repeat,
 			).encode(),
 			Default::default(),
+			&sp_state_machine::backend::get_runtime_code(&state)?,
 		)
 		.execute(strategy.into())
 		.map_err(|e| format!("Error executing runtime benchmark: {:?}", e))?;