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LibJS+LibWeb: Implement resizable ArrayBuffer support for DataView

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This is (part of) a normative change in the ECMA-262 spec. See:
a9ae96e
This commit is contained in:
Timothy Flynn 2023-10-15 09:46:09 -04:00 • committed by Andreas Kling
parent 29ac6e3689
commit c7fec9424c
12 changed files with 377 additions and 94 deletions
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19
Userland/Libraries/LibJS/Runtime/DataView.h
View file

@ -7,6 +7,7 @@
#pragma once
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/ByteLength.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Object.h>
@ -17,22 +18,32 @@ class DataView : public Object {
JS_DECLARE_ALLOCATOR(DataView);
public:
static NonnullGCPtr<DataView> create(Realm&, ArrayBuffer*, size_t byte_length, size_t byte_offset);
static NonnullGCPtr<DataView> create(Realm&, ArrayBuffer*, ByteLength byte_length, size_t byte_offset);
virtual ~DataView() override = default;
ArrayBuffer* viewed_array_buffer() const { return m_viewed_array_buffer; }
size_t byte_length() const { return m_byte_length; }
ByteLength const& byte_length() const { return m_byte_length; }
size_t byte_offset() const { return m_byte_offset; }
private:
DataView(ArrayBuffer*, size_t byte_length, size_t byte_offset, Object& prototype);
DataView(ArrayBuffer*, ByteLength byte_length, size_t byte_offset, Object& prototype);
virtual void visit_edges(Visitor& visitor) override;
GCPtr<ArrayBuffer> m_viewed_array_buffer;
size_t m_byte_length { 0 };
ByteLength m_byte_length { 0 };
size_t m_byte_offset { 0 };
};
// 25.3.1.1 DataView With Buffer Witness Records, https://tc39.es/ecma262/#sec-dataview-with-buffer-witness-records
struct DataViewWithBufferWitness {
NonnullGCPtr<DataView const> object; // [[Object]]
ByteLength cached_buffer_byte_length; // [[CachedBufferByteLength]]
};
DataViewWithBufferWitness make_data_view_with_buffer_witness_record(DataView const&, ArrayBuffer::Order);
u32 get_view_byte_length(DataViewWithBufferWitness const&);
bool is_view_out_of_bounds(DataViewWithBufferWitness const&);
}