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LibJS: Partially implement resizable ArrayBuffer objects

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This is (part of) a normative change in the ECMA-262 spec. See:
a9ae96e

This implements just support for resizing ArrayBuffer objects. This does
not implement the SharedArrayBuffer changes, as we do not have enough
support to do so.
This commit is contained in:
Timothy Flynn 2023-10-14 19:10:55 -04:00 • committed by Andreas Kling
parent a1e2f131c4
commit 29ac6e3689
13 changed files with 369 additions and 14 deletions
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21
Userland/Libraries/LibJS/Runtime/ArrayBuffer.h
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@ -69,6 +69,10 @@ public:
ByteBuffer& buffer() { return m_data_block.buffer(); }
ByteBuffer const& buffer() const { return m_data_block.buffer(); }
// [[ArrayBufferMaxByteLength]]
size_t max_byte_length() const { return m_max_byte_length.value(); }
void set_max_byte_length(size_t max_byte_length) { m_max_byte_length = max_byte_length; }
// Used by allocate_array_buffer() to attach the data block after construction
void set_data_block(DataBlock block) { m_data_block = move(block); }
@ -87,6 +91,17 @@ public:
return false;
}
// 25.1.3.8 IsFixedLengthArrayBuffer ( arrayBuffer ), https://tc39.es/ecma262/#sec-isfixedlengtharraybuffer
bool is_fixed_length() const
{
// 1. If arrayBuffer has an [[ArrayBufferMaxByteLength]] internal slot, return false.
if (m_max_byte_length.has_value())
return false;
// 2. Return true.
return true;
}
// 25.2.2.2 IsSharedArrayBuffer ( obj ), https://tc39.es/ecma262/#sec-issharedarraybuffer
bool is_shared_array_buffer() const
{
@ -121,6 +136,8 @@ private:
virtual void visit_edges(Visitor&) override;
DataBlock m_data_block;
Optional<size_t> m_max_byte_length;
// The various detach related members of ArrayBuffer are not used by any ECMA262 functionality,
// but are required to be available for the use of various harnesses like the Test262 test runner.
Value m_detach_key;
@ -128,8 +145,10 @@ private:
ThrowCompletionOr<DataBlock> create_byte_data_block(VM& vm, size_t size);
void copy_data_block_bytes(ByteBuffer& to_block, u64 to_index, ByteBuffer const& from_block, u64 from_index, u64 count);
ThrowCompletionOr<ArrayBuffer*> allocate_array_buffer(VM&, FunctionObject& constructor, size_t byte_length);
ThrowCompletionOr<ArrayBuffer*> allocate_array_buffer(VM&, FunctionObject& constructor, size_t byte_length, Optional<size_t> const& max_byte_length = {});
size_t array_buffer_byte_length(ArrayBuffer const&, ArrayBuffer::Order);
ThrowCompletionOr<void> detach_array_buffer(VM&, ArrayBuffer& array_buffer, Optional<Value> key = {});
ThrowCompletionOr<Optional<size_t>> get_array_buffer_max_byte_length_option(VM&, Value options);
ThrowCompletionOr<ArrayBuffer*> clone_array_buffer(VM&, ArrayBuffer& source_buffer, size_t source_byte_offset, size_t source_length);
ThrowCompletionOr<ArrayBuffer*> array_buffer_copy_and_detach(VM&, ArrayBuffer& array_buffer, Value new_length, PreserveResizability preserve_resizability);
ThrowCompletionOr<NonnullGCPtr<ArrayBuffer>> allocate_shared_array_buffer(VM&, FunctionObject& constructor, size_t byte_length);