feat: configure global allocator by default

CHANGELOG.md

@@ -13,6 +13,9 @@
 * expose `cur_block` and `genesis_config` from `RuntimeStandalone` to configure simulation tests. [PR 390](https://github.com/near/near-sdk-rs/pull/390).
 * fix(simulator): failing with long chains. [PR 385](https://github.com/near/near-sdk-rs/pull/385).
 * Make block time configurable to sim contract tests. [PR 378](https://github.com/near/near-sdk-rs/pull/378).
+* Set up global allocator by default for WASM architectures. [PR 429](https://github.com/near/near-sdk-rs/pull/429).
+  * This removes the re-export of `wee_alloc` because if this feature is enabled, the allocator will already be set.
+  * Deprecates `setup_alloc!` macro as this will be setup by default, as long as the `wee_alloc` feature is not specifically disabled. In this case, the allocator can be overriden to a custom one or set manually if intended.
 * Update `TreeMap` iterator implementation to avoid unnecessary storage reads. [PR 428](https://github.com/near/near-sdk-rs/pull/428).
 
 ## `3.1.0` [04-06-2021]

near-sdk/Cargo.toml

@@ -27,7 +27,7 @@ bs58 = "0.4"
 near-vm-logic = "=4.0.0-pre.1"
 near-primitives-core = "=0.4.0"
 # Export dependencies for contracts
-wee_alloc = { version = "0.4.5", default-features = false, features = [] }
+wee_alloc = { version = "0.4.5", default-features = false, optional = true }
 
 # Used for caching, might be worth porting only functionality needed.
 once_cell = { version = "1.7.2", optional = true, default-features = false }
@@ -40,5 +40,6 @@ rand_xorshift = "0.2.0"
 quickcheck = "0.9.2"
 
 [features]
+default = ["wee_alloc"]
 expensive-debug = []
 unstable = ["once_cell"]

near-sdk/src/lib.rs

@@ -36,6 +36,11 @@ pub use environment::blockchain_interface::BlockchainInterface;
 
 pub mod test_utils;
 
+// Set up global allocator by default if custom-allocator feature is not set in wasm32 architecture.
+#[cfg(all(feature = "wee_alloc", target_arch = "wasm32"))]
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
 // Exporting common crates
 
 #[doc(hidden)]
@@ -52,6 +57,3 @@ pub use serde;
 
 #[doc(hidden)]
 pub use serde_json;
-
-#[doc(hidden)]
-pub use wee_alloc;

near-sdk/src/utils/mod.rs

@@ -95,13 +95,15 @@ impl PendingContractTx {
 /// Sets up the [GlobalAllocator] with [`WeeAlloc`](crate::wee_alloc::WeeAlloc).
 ///
 /// [GlobalAllocator]: std::alloc::GlobalAlloc
+#[deprecated(
+    since = "4.0.0",
+    note = "Allocator is already initialized with the default `wee_alloc` feature set. \
+            Please make sure you don't disable default features on the SDK or set the global \
+            allocator manually."
+)]
 #[macro_export]
 macro_rules! setup_alloc {
-    () => {
-        #[cfg(target_arch = "wasm32")]
-        #[global_allocator]
-        static ALLOC: near_sdk::wee_alloc::WeeAlloc<'_> = near_sdk::wee_alloc::WeeAlloc::INIT;
-    };
+    () => {};
 }
 
 #[cfg(test)]