LadybirdBrowser/ladybird
1
1
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2024-09-19 09:17:38 +03:00
Code Issues Packages Projects Releases Wiki Activity

LibJS: Implement Atomics.isLockFree

Browse Source
This commit is contained in:
Timothy Flynn 2021-07-12 10:35:14 -04:00 committed by Linus Groh
parent d9c2447999
commit 1a3e1bff7b
Notes: sideshowbarker 2024-07-18 09:01:02 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/1a3e1bff7b1
Pull-request: https://github.com/SerenityOS/serenity/pull/8752
Reviewed-by: https://github.com/linusg ✅
4 changed files with 46 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
Userland/Libraries/LibJS/Runtime/AtomicsObject.cpp
View File

@ -122,6 +122,7 @@ void AtomicsObject::initialize(GlobalObject& global_object)
define_native_function(vm.names.and_, and_, 3, attr);
define_native_function(vm.names.compareExchange, compare_exchange, 4, attr);
define_native_function(vm.names.exchange, exchange, 3, attr);
define_native_function(vm.names.isLockFree, is_lock_free, 1, attr);
define_native_function(vm.names.load, load, 2, attr);
define_native_function(vm.names.or_, or_, 3, attr);
define_native_function(vm.names.store, store, 3, attr);
@ -262,6 +263,24 @@ JS_DEFINE_NATIVE_FUNCTION(AtomicsObject::exchange)
VERIFY_NOT_REACHED();
}
// 25.4.7 Atomics.isLockFree ( size ), https://tc39.es/ecma262/#sec-atomics.islockfree
JS_DEFINE_NATIVE_FUNCTION(AtomicsObject::is_lock_free)
{
auto size = vm.argument(0).to_integer_or_infinity(global_object);
if (vm.exception())
return {};
if (size == 1)
return Value(AK::atomic_is_lock_free<u8>());
if (size == 2)
return Value(AK::atomic_is_lock_free<u16>());
if (size == 4)
return Value(true);
if (size == 8)
return Value(AK::atomic_is_lock_free<u64>());
return Value(false);
}
// 25.4.8 Atomics.load ( typedArray, index ), https://tc39.es/ecma262/#sec-atomics.load
JS_DEFINE_NATIVE_FUNCTION(AtomicsObject::load)
{

1
Userland/Libraries/LibJS/Runtime/AtomicsObject.h
View File

@ -23,6 +23,7 @@ private:
JS_DECLARE_NATIVE_FUNCTION(and_);
JS_DECLARE_NATIVE_FUNCTION(compare_exchange);
JS_DECLARE_NATIVE_FUNCTION(exchange);
JS_DECLARE_NATIVE_FUNCTION(is_lock_free);
JS_DECLARE_NATIVE_FUNCTION(load);
JS_DECLARE_NATIVE_FUNCTION(or_);
JS_DECLARE_NATIVE_FUNCTION(store);

1
Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h
View File

@ -213,6 +213,7 @@ namespace JS {
P(isFinite) \
P(isFrozen) \
P(isInteger) \
P(isLockFree) \
P(isNaN) \
P(isPrototypeOf) \
P(isSafeInteger) \

25
Userland/Libraries/LibJS/Tests/builtins/Atomics/Atomics.isLockFree.js Normal file
View File

@ -0,0 +1,25 @@
test("invariants", () => {
expect(Atomics.isLockFree).toHaveLength(1);
});
test("basic functionality", () => {
expect(Atomics.isLockFree(4)).toBeTrue();
// Can't assume the return value of sizes 1, 2, and 8, but they shouldn't change.
expect(Atomics.isLockFree(1)).toBe(Atomics.isLockFree(1));
expect(Atomics.isLockFree(2)).toBe(Atomics.isLockFree(2));
expect(Atomics.isLockFree(8)).toBe(Atomics.isLockFree(8));
expect(Atomics.isLockFree(0)).toBeFalse();
expect(Atomics.isLockFree(3)).toBeFalse();
expect(Atomics.isLockFree(5)).toBeFalse();
expect(Atomics.isLockFree(6)).toBeFalse();
expect(Atomics.isLockFree(7)).toBeFalse();
expect(Atomics.isLockFree(9)).toBeFalse();
expect(Atomics.isLockFree(10)).toBeFalse();
expect(Atomics.isLockFree(Infinity)).toBeFalse();
expect(Atomics.isLockFree("not a number")).toBeFalse();
expect(Atomics.isLockFree(new Float32Array(4))).toBeFalse();
expect(Atomics.isLockFree(String.prototype)).toBeFalse();
});