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LibJS: Crudely implement growable SharedArrayBuffers

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We treat any mention of [[ArrayBufferByteLengthData]] and related
atomic operations as FIXMEs to be fixed at a later date. We also add the
HostGrowSharedArrayBuffer abstract operation, which will be overridden
by LibWeb to grow shared WebAssembly memories.
This commit is contained in:
CountBleck
2026-01-01 18:59:46 -08:00
committed by Ali Mohammad Pur
parent ee141dd9f7
commit d44b239621
Notes: github-actions[bot] 2026-01-04 06:49:02 +00:00 
Author: https://github.com/CountBleck
Commit: https://github.com/LadybirdBrowser/ladybird/commit/d44b2396217
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/7306
Reviewed-by: https://github.com/alimpfard
11 changed files with 180 additions and 17 deletions
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12
Libraries/LibJS/Runtime/SharedArrayBufferConstructor.cpp
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@@ -49,8 +49,11 @@ ThrowCompletionOr<GC::Ref<Object>> SharedArrayBufferConstructor::construct(Funct
{
auto& vm = this->vm();
auto length = vm.argument(0);
auto options = vm.argument(1);
// 2. Let byteLength be ? ToIndex(length).
auto byte_length_or_error = vm.argument(0).to_index(vm);
auto byte_length_or_error = length.to_index(vm);
if (byte_length_or_error.is_error()) {
auto error = byte_length_or_error.release_error();
@@ -61,8 +64,11 @@ ThrowCompletionOr<GC::Ref<Object>> SharedArrayBufferConstructor::construct(Funct
return error;
}
// 3. Return ? AllocateSharedArrayBuffer(NewTarget, byteLength).
return *TRY(allocate_shared_array_buffer(vm, new_target, byte_length_or_error.release_value()));
// 3. Let requestedMaxByteLength be ? GetArrayBufferMaxByteLengthOption(options).
auto requested_max_byte_length = TRY(get_array_buffer_max_byte_length_option(vm, options));
// 4. Return ? AllocateSharedArrayBuffer(NewTarget, byteLength, requestedMaxByteLength).
return *TRY(allocate_shared_array_buffer(vm, new_target, byte_length_or_error.release_value(), requested_max_byte_length));
}
// 25.2.4.2 get SharedArrayBuffer [ @@species ], https://tc39.es/ecma262/#sec-sharedarraybuffer-@@species