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LibJS: Define AllocateTypedArrayBuffer AO out of line

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Not only is it easier to compare to the spec when defined out of line,
but this AO was implemented inside other AOs twice.
This commit is contained in:
Timothy Flynn 2022-04-15 12:07:51 -04:00 committed by Linus Groh
parent c076b363ce
commit c20e8cea19
Notes: sideshowbarker 2024-07-17 11:46:53 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/c20e8cea19
Pull-request: https://github.com/SerenityOS/serenity/pull/13695
Reviewed-by: https://github.com/linusg ✅
1 changed files with 20 additions and 28 deletions
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48
Userland/Libraries/LibJS/Runtime/TypedArray.cpp
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@ -228,19 +228,12 @@ static ThrowCompletionOr<void> initialize_typed_array_from_typed_array(GlobalObj
return {};
}
// 23.2.5.1.5 InitializeTypedArrayFromArrayLike, https://tc39.es/ecma262/#sec-initializetypedarrayfromarraylike
// 23.2.5.1.6 AllocateTypedArrayBuffer ( O, length ), https://tc39.es/ecma262/#sec-allocatetypedarraybuffer
template<typename T>
static ThrowCompletionOr<void> initialize_typed_array_from_array_like(GlobalObject& global_object, TypedArray<T>& typed_array, Object const& array_like)
static ThrowCompletionOr<void> allocate_typed_array_buffer(GlobalObject& global_object, TypedArray<T>& typed_array, size_t length)
{
auto& vm = global_object.vm();
// 1. Let len be ? LengthOfArrayLike(arrayLike).
auto length = TRY(length_of_array_like(global_object, array_like));
// 2. Perform ? AllocateTypedArrayBuffer(O, len).
// 23.2.5.1.6 AllocateTypedArrayBuffer ( O, length )
// Enforce 2GB "Excessive Length" limit
if (length > NumericLimits<i32>::max() / sizeof(T))
return vm.template throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
@ -271,9 +264,21 @@ static ThrowCompletionOr<void> initialize_typed_array_from_array_like(GlobalObje
// 9. Set O.[[ArrayLength]] to length.
typed_array.set_array_length(length);
// 10. Return O.
// End of 23.2.5.1.6
// 10. Return unused.
return {};
}
// 23.2.5.1.5 InitializeTypedArrayFromArrayLike, https://tc39.es/ecma262/#sec-initializetypedarrayfromarraylike
template<typename T>
static ThrowCompletionOr<void> initialize_typed_array_from_array_like(GlobalObject& global_object, TypedArray<T>& typed_array, Object const& array_like)
{
// 1. Let len be ? LengthOfArrayLike(arrayLike).
auto length = TRY(length_of_array_like(global_object, array_like));
// 2. Perform ? AllocateTypedArrayBuffer(O, len).
TRY(allocate_typed_array_buffer(global_object, typed_array, length));
// 3. Let k be 0.
// 4. Repeat, while k < len,
for (size_t k = 0; k < length; k++) {
// a. Let Pk be ! ToString(𝔽(k)).
@ -286,6 +291,7 @@ static ThrowCompletionOr<void> initialize_typed_array_from_array_like(GlobalObje
// d. Set k to k + 1.
}
// 5. Return unused.
return {};
}
@ -293,27 +299,11 @@ static ThrowCompletionOr<void> initialize_typed_array_from_array_like(GlobalObje
template<typename T>
static ThrowCompletionOr<void> initialize_typed_array_from_list(GlobalObject& global_object, TypedArray<T>& typed_array, MarkedVector<Value> const& list)
{
auto& vm = global_object.vm();
// 1. Let len be the number of elements in values.
auto length = list.size();
// 2. Perform ? AllocateTypedArrayBuffer(O, len).
// Enforce 2GB "Excessive Length" limit
if (length > NumericLimits<i32>::max() / sizeof(T))
return vm.template throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
auto element_size = typed_array.element_size();
if (Checked<size_t>::multiplication_would_overflow(element_size, length))
return vm.template throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
auto byte_length = element_size * length;
auto array_buffer = TRY(allocate_array_buffer(global_object, *global_object.array_buffer_constructor(), byte_length));
typed_array.set_viewed_array_buffer(array_buffer);
typed_array.set_byte_length(byte_length);
typed_array.set_byte_offset(0);
typed_array.set_array_length(length);
TRY(allocate_typed_array_buffer(global_object, typed_array, length));
// 3. Let k be 0.
// 4. Repeat, while k < len,
@ -328,6 +318,8 @@ static ThrowCompletionOr<void> initialize_typed_array_from_list(GlobalObject& gl
// d. Set k to k + 1.
}
// 5. Assert: values is now an empty List.
// 6. Return unused.
return {};
}