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//
// FieldDescriptor.swift
// HandyJSON
//
// Created by chantu on 2019/1/31.
// Copyright © 2019 aliyun. All rights reserved.
//
import Foundation
enum FieldDescriptorKind : UInt16 {
// Swift nominal types.
case Struct = 0
case Class
case Enum
// Fixed-size multi-payload enums have a special descriptor format that
// encodes spare bits.
//
// FIXME: Actually implement this. For now, a descriptor with this kind
// just means we also have a builtin descriptor from which we get the
// size and alignment.
case MultiPayloadEnum
// A Swift opaque protocol. There are no fields, just a record for the
// type itself.
case `Protocol`
// A Swift class-bound protocol.
case ClassProtocol
// An Objective-C protocol, which may be imported or defined in Swift.
case ObjCProtocol
// An Objective-C class, which may be imported or defined in Swift.
// In the former case, field type metadata is not emitted, and
// must be obtained from the Objective-C runtime.
case ObjCClass
}
struct FieldDescriptor: PointerType {
var pointer: UnsafePointer<_FieldDescriptor>
var fieldRecordSize: Int {
return Int(pointer.pointee.fieldRecordSize)
}
var numFields: Int {
return Int(pointer.pointee.numFields)
}
var fieldRecords: [FieldRecord] {
return (0..<numFields).map({ (i) -> FieldRecord in
return FieldRecord(pointer: UnsafePointer<_FieldRecord>(pointer + 1) + i)
})
}
}
struct _FieldDescriptor {
var mangledTypeNameOffset: Int32
var superClassOffset: Int32
var fieldDescriptorKind: FieldDescriptorKind
var fieldRecordSize: Int16
var numFields: Int32
}
struct FieldRecord: PointerType {
var pointer: UnsafePointer<_FieldRecord>
var fieldRecordFlags: Int {
return Int(pointer.pointee.fieldRecordFlags)
}
var mangledTypeName: UnsafePointer<UInt8>? {
let address = Int(bitPattern: pointer) + 1 * 4
let offset = Int(pointer.pointee.mangledTypeNameOffset)
let cString = UnsafePointer<UInt8>(bitPattern: address + offset)
return cString
}
var fieldName: String {
let address = Int(bitPattern: pointer) + 2 * 4
let offset = Int(pointer.pointee.fieldNameOffset)
if let cString = UnsafePointer<UInt8>(bitPattern: address + offset) {
return String(cString: cString)
}
return ""
}
}
struct _FieldRecord {
var fieldRecordFlags: Int32
var mangledTypeNameOffset: Int32
var fieldNameOffset: Int32
}
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