File: CanonicalLifting.swift

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/// A namespace for the canonical lifting operations used by host side.
public enum CanonicalLifting {
    /// Lifts a pair of a pointer and a length to a Swift Array value with the given element type.
    ///
    /// - Parameters:
    ///   - pointer: A pointer to a guest memory region that contains the byte representation of the array value.
    ///   - length: A length of the array value.
    ///   - elementSize: A byte size of an element of the array value in lowered representation.
    ///   - loadElement: A closure that loads an element from the given pointer.
    ///   - memoryBase: A base address of the guest memory region. Can be `nil` if length is zero.
    /// - Returns: A lifted Swift Array value with the given element type.
    public static func liftList<Element>(
        pointer: UInt32, length: UInt32, elementSize: UInt32,
        loadElement: (UnsafeGuestRawPointer) throws -> Element,
        context: CanonicalCallContext
    ) throws -> [Element] {
        var elements = [Element]()
        elements.reserveCapacity(Int(elementSize))
        let guestPointer = UnsafeGuestRawPointer(memorySpace: context.guestMemory, offset: pointer)
        for i in 0..<length {
            let element = try loadElement(guestPointer.advanced(by: i * elementSize))
            elements.append(element)
        }
        return elements
    }
}