Implement Atomics builtin (#3394)

* Implement `Atomics` builtin

* Apply review

Cargo.toml

@@ -20,7 +20,7 @@ members = [
 [workspace.package]
 edition = "2021"
 version = "0.17.0"
-rust-version = "1.71.0"
+rust-version = "1.73.0"
 authors = ["boa-dev"]
 repository = "https://github.com/boa-dev/boa"
 license = "Unlicense OR MIT"

boa_engine/Cargo.toml

@@ -41,7 +41,7 @@ fuzz = ["boa_ast/arbitrary", "boa_interner/arbitrary"]
 flowgraph = []
 
 # Enable Boa's VM instruction tracing.
-trace = []
+trace = ["js"]
 
 # Enable Boa's additional ECMAScript features for web browsers.
 annex-b = ["boa_parser/annex-b"]
@@ -52,6 +52,9 @@ temporal = ["boa_parser/temporal", "dep:icu_calendar"]
 # Enable experimental features, like Stage 3 proposals.
 experimental = ["temporal"]
 
+# Enable binding to JS APIs for system related utilities.
+js = ["dep:web-time"]
+
 [dependencies]
 boa_interner.workspace = true
 boa_gc = { workspace = true, features = [ "thinvec" ] }
@@ -86,6 +89,9 @@ icu_normalizer = "~1.3.0"
 paste = "1.0"
 portable-atomic = "1.5.1"
 bytemuck = { version = "1.14.0", features = ["derive"] }
+arrayvec = "0.7.4"
+intrusive-collections = "0.9.6"
+cfg-if = "1.0.0"
 
 # intl deps
 boa_icu_provider = {workspace = true, features = ["std"], optional = true }
@@ -105,6 +111,9 @@ yoke = { workspace = true, optional = true }
 zerofrom = { workspace = true, optional = true }
 fixed_decimal = { workspace = true, features = ["ryu"], optional = true}
 
+[target.'cfg(all(target_family = "wasm", not(any(target_os = "emscripten", target_os = "wasi"))))'.dependencies]
+web-time = { version = "0.2.2", optional = true }
+
 [dev-dependencies]
 criterion = "0.5.1"
 float-cmp = "0.9.0"

boa_engine/src/builtins/array_buffer/shared.rs

@@ -34,6 +34,13 @@ pub struct SharedArrayBuffer {
 }
 
 impl SharedArrayBuffer {
+    /// Creates a `SharedArrayBuffer` with an empty buffer.
+    #[must_use]
+    pub fn empty() -> Self {
+        Self {
+            data: Arc::default(),
+        }
+    }
     /// Gets the length of this `SharedArrayBuffer`.
     pub(crate) fn len(&self) -> usize {
         self.data.len()

boa_engine/src/builtins/array_buffer/utils.rs

@@ -91,7 +91,7 @@ impl SliceRef<'_> {
             // 9. Return RawBytesToNumeric(type, rawValue, isLittleEndian).
 
             // SAFETY: The invariants of this operation are ensured by the caller.
-            unsafe { T::read_from_buffer(buffer, order) }
+            unsafe { T::read(buffer).load(order) }
         }
 
         let buffer = *self;
@@ -259,7 +259,7 @@ impl SliceRefMut<'_> {
 
             // SAFETY: The invariants of this operation are ensured by the caller.
             unsafe {
-                T::write_to_buffer(buffer, value, order);
+                T::read_mut(buffer).store(value, order);
             }
         }