Make libcontract compile to wasm

substrate/runtime-std/with_std.rs

@@ -29,6 +29,7 @@ pub use std::ops;
 pub use std::ptr;
 pub use std::rc;
 pub use std::slice;
+pub use std::string;
 pub use std::vec;
 pub use std::result;
 

substrate/runtime-std/without_std.rs

@@ -24,6 +24,7 @@ extern crate pwasm_alloc;
 pub use alloc::boxed;
 pub use alloc::rc;
 pub use alloc::vec;
+pub use alloc::string;
 pub use core::borrow;
 pub use core::cell;
 pub use core::clone;

substrate/runtime/contract/src/genesis_config.rs

@@ -16,6 +16,8 @@
 
 //! Build the contract module part of the genesis block storage.
 
+#![cfg(feature = "std")]
+
 use {Trait, ContractFee, CallBaseFee, CreateBaseFee, GasPrice, MaxDepth, BlockGasLimit};
 
 use runtime_primitives;

substrate/runtime/contract/src/lib.rs

@@ -66,7 +66,7 @@ extern crate substrate_codec as codec;
 extern crate substrate_runtime_io as runtime_io;
 extern crate substrate_runtime_sandbox as sandbox;
 
-#[cfg_attr(feature = "std", macro_use)]
+#[macro_use]
 extern crate substrate_runtime_std as rstd;
 
 extern crate substrate_runtime_balances as balances;
@@ -90,16 +90,19 @@ mod double_map;
 mod exec;
 mod vm;
 mod gas;
+
 mod genesis_config;
 
 #[cfg(test)]
 mod tests;
 
+#[cfg(feature = "std")]
 pub use genesis_config::GenesisConfig;
 use exec::ExecutionContext;
 use account_db::{AccountDb, OverlayAccountDb};
 use double_map::StorageDoubleMap;
 
+use rstd::prelude::*;
 use codec::Codec;
 use runtime_primitives::traits::{As, SimpleArithmetic, OnFinalise};
 use runtime_support::dispatch::Result;

substrate/runtime/contract/src/vm/env_def/macros.rs

@@ -137,7 +137,7 @@ macro_rules! define_env {
 
 			$(
 				env.funcs.insert(
-					stringify!( $name ).to_string(),
+					stringify!( $name ).into(),
 					HostFunction::new(
 						gen_signature!( ( $( $params ),* ) $( -> $returns )* ),
 						{

substrate/runtime/contract/src/vm/env_def/mod.rs

@@ -17,6 +17,8 @@
 use super::{BalanceOf, CallReceipt, CreateReceipt, Ext, GasMeterResult, Runtime};
 use codec::Decode;
 use parity_wasm::elements::{FunctionType, ValueType};
+use rstd::prelude::*;
+use rstd::string::String;
 use rstd::collections::btree_map::BTreeMap;
 use runtime_primitives::traits::As;
 use sandbox::{self, TypedValue};

substrate/runtime/contract/src/vm/prepare.rs

@@ -19,6 +19,7 @@
 
 use super::env_def::HostFunctionSet;
 use super::{Config, Error, Ext};
+use rstd::prelude::*;
 use parity_wasm::elements::{self, External, MemoryType, Type};
 use pwasm_utils;
 use pwasm_utils::rules;