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8554ee386e
Add the proper annotations for the Cell and Cell::Visitor classes to be visible in Swift. This lets us remove some OpaquePointer shinangians in the Swift bindings.
82 lines
2.8 KiB
Swift
82 lines
2.8 KiB
Swift
/*
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* Copyright (c) 2024, Andrew Kaster <andrew@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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import AK
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@_exported import GCCxx
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extension GC.Heap {
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public func withDeferredGC<R, E>(_ body: () throws(E) -> R) throws(E) -> R {
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let deferredRAII = GC.DeferGC(self)
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_ = deferredRAII
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return try body()
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}
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}
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public protocol HeapAllocatable {
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static func allocate(on heap: GC.Heap) -> UnsafeMutablePointer<Self>
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init(cell: GC.Cell)
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func finalize()
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func visitEdges(_ visitor: GC.Cell.Visitor)
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var cell: GC.Cell { get }
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}
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// Here be dragons
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func asTypeMetadataPointer(_ type: Any.Type) -> UnsafeMutableRawPointer {
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unsafeBitCast(type, to: UnsafeMutableRawPointer.self)
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}
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func asHeapAllocatableType(_ typeMetadata: UnsafeMutableRawPointer) -> any HeapAllocatable.Type {
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let typeObject = unsafeBitCast(typeMetadata, to: Any.Type.self)
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guard let type = typeObject as? any HeapAllocatable.Type else {
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fatalError("Passed foreign class but it wasn't a Swift type!")
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}
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return type
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}
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extension HeapAllocatable {
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fileprivate static func initializeFromFFI(at this: UnsafeMutableRawPointer, cell: GC.Cell) {
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this.assumingMemoryBound(to: Self.self).initialize(to: Self.self.init(cell: cell))
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}
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fileprivate static func destroyFromFFI(at this: UnsafeMutableRawPointer) {
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this.assumingMemoryBound(to: Self.self).deinitialize(count: 1)
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}
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fileprivate static func finalizeFromFFI(at this: UnsafeMutableRawPointer) {
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this.assumingMemoryBound(to: Self.self).pointee.finalize()
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}
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fileprivate static func visitEdgesFromFFI(at this: UnsafeMutableRawPointer, visitor: GC.Cell.Visitor) {
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this.assumingMemoryBound(to: Self.self).pointee.visitEdges(visitor)
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}
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public static func allocate(on heap: GC.Heap) -> UnsafeMutablePointer<Self> {
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let vtable = GC.ForeignCell.Vtable(
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class_metadata_pointer: asTypeMetadataPointer(Self.self),
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class_name: AK.String(swiftString: Swift.String(describing: Self.self)),
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alignment: MemoryLayout<Self>.alignment,
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initialize: { this, typeMetadata, cell in
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asHeapAllocatableType(typeMetadata!).initializeFromFFI(at: this!, cell: cell.ptr())
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},
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destroy: { this, typeMetadata in
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asHeapAllocatableType(typeMetadata!).destroyFromFFI(at: this!)
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},
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finalize: { this, typeMetadata in
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asHeapAllocatableType(typeMetadata!).finalizeFromFFI(at: this!)
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},
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visit_edges: nil
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)
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let cell = GC.ForeignCell.create(heap, MemoryLayout<Self>.stride, vtable)
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return cell.pointee.foreign_data().assumingMemoryBound(to: Self.self)
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}
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public func finalize() {}
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public func visitEdges(_ visitor: GC.Cell.Visitor) {}
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}
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