/*
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* Copyright 1999-2101 Alibaba Group.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// Created by zhouzhuo on 07/01/2017.
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//
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protocol ContextDescriptorType : MetadataType {
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var contextDescriptorOffsetLocation: Int { get }
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}
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extension ContextDescriptorType {
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var contextDescriptor: ContextDescriptorProtocol? {
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let pointer = UnsafePointer<Int>(self.pointer)
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let base = pointer.advanced(by: contextDescriptorOffsetLocation)
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if base.pointee == 0 {
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// swift class created dynamically in objc-runtime didn't have valid contextDescriptor
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return nil
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}
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if self.kind == .class {
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return ContextDescriptor<_ClassContextDescriptor>(pointer: relativePointer(base: base, offset: base.pointee - Int(bitPattern: base)))
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} else {
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return ContextDescriptor<_StructContextDescriptor>(pointer: relativePointer(base: base, offset: base.pointee - Int(bitPattern: base)))
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}
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}
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var contextDescriptorPointer: UnsafeRawPointer? {
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let pointer = UnsafePointer<Int>(self.pointer)
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let base = pointer.advanced(by: contextDescriptorOffsetLocation)
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if base.pointee == 0 {
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return nil
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}
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return UnsafeRawPointer(bitPattern: base.pointee)
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}
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// var genericArgumentVector: UnsafeRawPointer? {
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// let pointer = UnsafePointer<Int>(self.pointer)
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// let base = pointer.advanced(by: 19)
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// if base.pointee == 0 {
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// return nil
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// }
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// return UnsafeRawPointer(base)
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// }
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var mangledName: String {
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let pointer = UnsafePointer<Int>(self.pointer)
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let base = pointer.advanced(by: contextDescriptorOffsetLocation)
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let mangledNameAddress = base.pointee + 2 * 4 // 2 properties in front
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if let offset = contextDescriptor?.mangledName,
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let cString = UnsafePointer<UInt8>(bitPattern: mangledNameAddress + offset) {
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return String(cString: cString)
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}
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return ""
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}
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var numberOfFields: Int {
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return contextDescriptor?.numberOfFields ?? 0
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}
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var fieldOffsets: [Int]? {
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guard let contextDescriptor = self.contextDescriptor else {
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return nil
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}
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let vectorOffset = contextDescriptor.fieldOffsetVector
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guard vectorOffset != 0 else {
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return nil
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}
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if self.kind == .class {
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return (0..<contextDescriptor.numberOfFields).map {
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return UnsafePointer<Int>(pointer)[vectorOffset + $0]
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}
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} else {
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return (0..<contextDescriptor.numberOfFields).map {
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return Int(UnsafePointer<Int32>(pointer)[vectorOffset * (is64BitPlatform ? 2 : 1) + $0])
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}
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}
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}
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var reflectionFieldDescriptor: FieldDescriptor? {
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guard let contextDescriptor = self.contextDescriptor else {
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return nil
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}
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let pointer = UnsafePointer<Int>(self.pointer)
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let base = pointer.advanced(by: contextDescriptorOffsetLocation)
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let offset = contextDescriptor.reflectionFieldDescriptor
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let address = base.pointee + 4 * 4 // (4 properties in front) * (sizeof Int32)
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guard let fieldDescriptorPtr = UnsafePointer<_FieldDescriptor>(bitPattern: address + offset) else {
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return nil
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}
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return FieldDescriptor(pointer: fieldDescriptorPtr)
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}
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}
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protocol ContextDescriptorProtocol {
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var mangledName: Int { get }
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var numberOfFields: Int { get }
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var fieldOffsetVector: Int { get }
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var reflectionFieldDescriptor: Int { get }
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}
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struct ContextDescriptor<T: _ContextDescriptorProtocol>: ContextDescriptorProtocol, PointerType {
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var pointer: UnsafePointer<T>
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var mangledName: Int {
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return Int(pointer.pointee.mangledNameOffset)
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}
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var numberOfFields: Int {
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return Int(pointer.pointee.numberOfFields)
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}
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var fieldOffsetVector: Int {
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return Int(pointer.pointee.fieldOffsetVector)
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}
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var fieldTypesAccessor: Int {
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return Int(pointer.pointee.fieldTypesAccessor)
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}
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var reflectionFieldDescriptor: Int {
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return Int(pointer.pointee.reflectionFieldDescriptor)
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}
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}
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protocol _ContextDescriptorProtocol {
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var mangledNameOffset: Int32 { get }
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var numberOfFields: Int32 { get }
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var fieldOffsetVector: Int32 { get }
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var fieldTypesAccessor: Int32 { get }
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var reflectionFieldDescriptor: Int32 { get }
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}
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struct _StructContextDescriptor: _ContextDescriptorProtocol {
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var flags: Int32
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var parent: Int32
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var mangledNameOffset: Int32
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var fieldTypesAccessor: Int32
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var reflectionFieldDescriptor: Int32
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var numberOfFields: Int32
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var fieldOffsetVector: Int32
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}
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struct _ClassContextDescriptor: _ContextDescriptorProtocol {
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var flags: Int32
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var parent: Int32
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var mangledNameOffset: Int32
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var fieldTypesAccessor: Int32
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var reflectionFieldDescriptor: Int32
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var superClsRef: Int32
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var metadataNegativeSizeInWords: Int32
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var metadataPositiveSizeInWords: Int32
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var numImmediateMembers: Int32
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var numberOfFields: Int32
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var fieldOffsetVector: Int32
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}
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