Smart-contract inspection and instrumentation. (#165)

* Extract mock module.

* Wasm smart-contract instrumentation

* Rebuild binaries.

* Memory limits and tests.

polkadot/runtime/wasm/Cargo.lock

@@ -354,6 +354,14 @@ dependencies = [
  "parking_lot 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "parity-wasm"
+version = "0.30.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.4.8"
@@ -469,6 +477,16 @@ dependencies = [
 name = "pwasm-libc"
 version = "0.1.0"
 
+[[package]]
+name = "pwasm-utils"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parity-wasm 0.30.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "quote"
 version = "0.3.15"
@@ -813,6 +831,8 @@ name = "substrate-runtime-staking"
 version = "0.1.0"
 dependencies = [
  "hex-literal 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parity-wasm 0.30.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pwasm-utils 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 0.1.0",
  "serde 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-codec 0.1.0",
@@ -1087,6 +1107,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum odds 0.2.26 (registry+https://github.com/rust-lang/crates.io-index)" = "4eae0151b9dacf24fcc170d9995e511669a082856a91f958a2fe380bfab3fb22"
 "checksum owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "cdf84f41639e037b484f93433aa3897863b561ed65c6e59c7073d7c561710f37"
 "checksum parity-wasm 0.27.6 (registry+https://github.com/rust-lang/crates.io-index)" = "bd4dc02a80a0315b109e48992c46942c79bcdb8fac416dd575d330ed9ced6cbd"
+"checksum parity-wasm 0.30.0 (registry+https://github.com/rust-lang/crates.io-index)" = "41083957b80abb8a01fac4d2773d5f92653aed8f0b740c8d3da1da62c7857abe"
 "checksum parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "149d8f5b97f3c1133e3cfcd8886449959e856b557ff281e292b733d7c69e005e"
 "checksum parking_lot 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "9fd9d732f2de194336fb02fe11f9eed13d9e76f13f4315b4d88a14ca411750cd"
 "checksum parking_lot_core 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "9f35048d735bb93dd115a0030498785971aab3234d311fbe273d020084d26bd8"
@@ -1094,6 +1115,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum plain_hasher 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "83ae80873992f511142c07d0ec6c44de5636628fdb7e204abd655932ea79d995"
 "checksum proc-macro-hack 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3ba8d4f9257b85eb6cdf13f055cea3190520aab1409ca2ab43493ea4820c25f0"
 "checksum proc-macro-hack-impl 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d5cb6f960ad471404618e9817c0e5d10b1ae74cfdf01fab89ea0641fe7fb2892"
+"checksum pwasm-utils 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a3a822d2a1624b10c46572c231c149575bcc261c37d84fd3f1a2f5ae1f65515"
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
 "checksum rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)" = "15a732abf9d20f0ad8eeb6f909bf6868722d9a06e1e50802b6a70351f40b4eb1"
 "checksum rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "eba5f8cb59cc50ed56be8880a5c7b496bfd9bd26394e176bc67884094145c2c5"